Compensator for smoothing-out pulsations of liquid

FIELD: pipe line transport; pipe lines at irregular delivery of liquid.

SUBSTANCE: proposed compensator includes at least one bellows whose open end is used for connection with chamber by means of bush; opposite end of bellows is blind. Bellows has at least one wide or high corrugation. Compensator may include at least two members located coaxially and intended for communication of their inner cavities with chamber. Bellows members are located one after another along their longitudinal axis and are connected by means of bushes having holes. Sizes of corrugations are indicated in Specification.

EFFECT: extended field of application.

10 cl, 13 dwg

 

The invention relates to structures for pulsation compensation liquids and can be used in various machines and mechanisms, in which the fluid is uneven, mainly to compensate for the pressure pulsations of fuel in the low pressure circuit of the fuel high-pressure pump (injection pump).

Known bellows, comprising a housing, made of narrow corrugation and at least one corrugation of the walls of which are connected with each other by the convex surfaces and concave surfaces, respectively, and the convex surface and concave surface in longitudinal section of the body in the form of semicircles. (Patent RF №2173804, F 16 J 3/04, publ. 2001).

This bellows is the ratio of the radius R of the convex surface of the wide corrugations to the radius r of the convex surface of the narrow corrugations is selected in the range from 1.5 to 2.5, the ratio of the height H between the convex surface of the wide corrugations and related narrow concave surface corrugations to the height h between the convex surface and concave surface narrow corrugations is in the range from 0.5 to 1.5, the ratio of radius R1the concave surface between a wide Flexi hose and narrow Flexi hose to the radius r1the concave surface between the narrow corrugations is in the range from 1.0 to 2.2.

This bellows has not been designed to function as hydrocolpos the Torah.

Known lifters containing the bellows, the open end of which is intended for connection to the camera (U.S. Patent No. 4324276, F 16 L 55/04, publ. 1982).

The device contains a spring, gaskets and ball valve for the fluid inside the bellows when increasing a threshold fluid pressure in the chamber.

A limitation of the design is the lack of the amount of smoothing of the ripple and the complexity of the design. The corrugations of the bellows in its longitudinal section is made the same width, volnoobraznye that is not possible to effectively damp the pressure pulsations of the fluid, therefore, in the design of the valve is used.

A device for smoothing out the pulsations of the fluid, is made of bellows, accommodated in the housing, one end of which is connected to the housing, and the other communicated with the piping connected to the camera (U.S. Patent No. 6230684, F 02 M L 37/04, publ. 2001).

In this technical solution, the fluid pulsations fills the cavity between the outer surface of the bellows and the housing. In such a hydraulic compensation is used the power characteristics of the elasticity of the bellows and the area of its plugged end (piston). The device works as an absorber of excess fluid pressure, which affects its pulsating flow. The fluid entering the comp is Sator, washes the outer surface of the bellows, which is under postoyannim liquid in one certain range frequency ripple.

The disadvantage of this device is the lack of value of the smoothing coefficient.

A device for smoothing ripple containing at least two bellows arranged coaxially and intended for the message of their internal cavities with cavity chambers (Germany Application No. 3228080, F 02 M 61/10, publ. 1984).

In this device, the bellows are coaxial (one within another). The device also contains a spring-loaded valve for the fluid inside the bellows when increasing a threshold fluid pressure in the chamber, the bushing in the hole which is located the valve stem and which are fixed on both ends of the bellows. On the outer surface of the valve stem is made a longitudinal groove, ensuring the passage of fluid into the internal cavity of the bellows. On facing the valve opening surface of one of the sleeves is made annular groove and a longitudinal hole, providing a flow of liquid from the outer surface of the outer bellows in a large cavity between it and the casing. As a result, the damping of the pulsations of the fluid involves two cavities for two bellows, one located inside the interior of the bellows, the other, larger, located on the outer side of the outer bellows. At small values of the pulsation of the fluid works the inner bellows, with large pulsations of the fluid, when the internal cavity of the bellows is filled with a liquid, begins to work on leveling the external cavity of the outer bellows.

The advantage of this technical solution compared with other counterparts is the use of two bellows for smoothing small ripple and significant value.

A limitation of the design are:

lack of efficiency smoothing small ripple due to the simultaneous flow of fluid in the internal cavity of the bellows and into the outer cavity between the outer bellows and the housing. Indeed, the inner bellows begins to work to expand only after the opening of the valve when fully filling the inner volume of the inner bellows. When reducing the pressure in the chamber and at low pulsation fluid freely flows from the internal cavity of the inner bellows back into the camera, with the corrugations of the bellows do not work on compression, if the internal cavity of the bellows was not completely filled with liquid, and its corrugations were not in a state of tension. The return fluid can occur only from the influence of the spring on the valve stem at the end of the bellows, is about such an effect almost immediately closes the valve;

lack of efficiency smoothing large ripples because of large pulsations of the outer bellows at smoothing the ripple does not affect. Indeed, for large pulsations and filling the internal cavity of the bellows fluid under pressure enters the cavity between the outer bellows and the housing. In the smoothing of large quantities of pulsations participates only this, a large cavity, and the smoothing is carried out only by flowing the liquid into a large cavity through holes in the sleeve. The corrugations of the outer bellows are not stretched. When the discharge pulsation of the large magnitude of the corrugations of the outer bellows also not compressed until such time does not begin until the exit of fluid from the internal cavity of the bellows. Essentially the outer bellows serves only to ensure the free compression internal corrugation of the bellows when the leakage from his oral liquid;

the device is able to smooth out the pulses in only one of the amplitude and frequency range, because the expansion and contraction of the internal corrugation of the bellows occurs only for pulsations of liquid of a certain amplitude and frequency;

- the device is able to effectively smooth only some average of ripples when pulsations correspond to some limited the total fill volume of the cavity HV the internal bellows. The device doesn't have a wide range of smoothing as medium, small and large values of the amplitudes of the pulsations of the fluid;

- the complexity of the structures due to the large number of parts and because of this lack of reliability and the time period of operation. Such a design is impractical to use, for example, to compensate for the pressure pulsations of fuel in the low pressure circuit of the fuel high-pressure pump (injection pump).

Known compensator to smooth out the pulsations of the fluid containing bellows, the open end of which is intended for connection to the camera (U.S. Patent No. 5407329, F 16 17/06, publ. 1982).

The design also contains a ball valve mounted on the open end of the bellows, the fluid inside the bellows when increasing a threshold fluid pressure in the chamber.

A limitation of the design is its complexity and the lack of stabilization and leveling in a wide range of amplitudes and frequencies of the pulsations. The corrugations of the bellows in its longitudinal cross-sectional identical and triangular in shape. This shape of the corrugation is not possible to effectively damp the pressure pulsations of the fluid, so the designs are also used valve.

Solved by the invention is to improve the quality and reliability of the device, the improvement of technical and operational the characteristics when it is functioning in conditions of periodic exposure to liquids, improved smoothing of the pulsations of the fluid and the expansion of the range of anti-aliasing.

The technical result that can be obtained when performing device - stabilizing and leveling in a wide range of amplitudes and frequencies of pulsation, the pressure increase in the chamber and maintaining the excess fluid pressure at an optimum working level, simplifying the design.

To solve the problem with the achievement of the technical result of the expansion joint to smooth out pulsations in the liquid contains at least one bellows, the open end of which is intended for connection to the camera through the sleeve, and the opposite end of the bellows is made hollow, and the bellows is made of at least one wide Flexi hose relative to its narrow corrugation, and the width T wide corrugations selected satisfies the relation of 1.0<T/t<1,5, where t is the width of the narrow corrugations.

Possible additional embodiments of the claimed compensator, where appropriate, to:

- wall corrugation bellows were made in the form of rings arranged perpendicular to the longitudinal axis and connected between the convex surfaces and concave surfaces, respectively, and the convex surface and concave surface were performed in the longitudinal section in the form polocrosse the TEI, moreover, the ratio of the radius of the convex surface wide corrugations to the radius of the convex surface of the narrow corrugations is selected in the range of 1.1-1,49;

bellows was made, at least one high Flexi hose relative to the other of the corrugation, and the height H of the high corrugation was chosen to match the ratio of 1.0<H/h<2,5, where h is the height of the other corrugation;

this is a closed end of the bellows is spring-loaded;

bellows was performed at least two bellows elements arranged coaxially and intended for the message of their internal cavities with cavity chambers and bellows elements were arranged in series one behind the other along their longitudinal axis and provided with a second sleeve with a hole, the first bellows element is designed to connect to the camera through the first mentioned sleeve with a hole, fixed on its edge, the second bellows element connected to the first bellows element through the second sleeve with the hole, secured to facing each other, the ends of the first and second bellows elements and the other end of the second bellows element made deaf, and the effective area of the cross section of one of the bellows elements was made greater than the effective area of cross section of another bellow element.

the effective cross - section area of the first bellows element b is La made more than the effective area of the cross section of the second bellows element, and the bore diameter of the first sleeve was made larger than the hole diameter of the second sleeve;

bellows was fitted with an emphasis and a casing on the outside of bellows elements and mounted on the outer surface of the first sleeve and the fence was installed in the housing with the provision of support on the dull end of the second bellows element;

- emphasis was made adjustable by providing the possibility of changing the length of the bellows elements along their longitudinal axis;

- the width of one corrugation of the bellows elements was made greater than the width of the corrugation of the other bellows element;

- at least one of the bellows elements was performed, with at least one higher Flexi hose, other than his flute.

These advantages, and features of the present invention are explained the best options for its implementation with reference to the accompanying figures.

1 schematically depicts a longitudinal cross-section compensator,

figure 2 - corrugation bellows, schematically;

figure 3 same as figure 1, when the bellows is spring-loaded;

figure 4 - same as figure 1, with two bellows elements;

figure 5 - same as 4, with case and emphasis;

6 is a plot of pressure change in the chamber over time, in particular in the cavity to the low pressure fuel pump is high pressure (fuel pump), without compensator;

Fig.7. same as Fig.6, with the compensator is made of a single bellows element, as shown in figure 1;

Fig - same as 6, for another injection pump;

Fig.9 is the same as Fig, with the compensator consists of two bellows elements, as shown in figure 4;

figure 10 - frequency characteristics in the low pressure circuit test data sets without compensator with compensator made as shown in figure 1;

11 - characteristics of change of pressure in the low pressure circuit pump without compensator with compensator, made, as shown in figure 1;

Fig - same as 11, without compensator with compensator, made, as shown in figure 4;

Fig - same as 11, with the expansion completed, as shown in figure 5, and with the compensator in figure 5, is compressed by 60%.

The expansion joint to smooth the pulsations of the fluid (1, 2) contains at least one bellows 1, the open end 2 of which is intended for connection to the camera (figure 1, 2 is not shown). The opposite end 3 of the bellows 1 is made hollow. The bellows 1 is made of at least one wide Flexi hose 4 is relatively narrow corrugation 5. Width T wide corrugations 4 selected satisfies the relation of 1.0<T/t<1,5, where t is the width of the narrow corrugations 5. Figure 1 also shows: stub 6, sleeve 7 with an opening 8 for connection to the camera.

Wall corrugation with whom livona 1 can be made in the form of rings, perpendicular to the longitudinal axis and connected between the convex surfaces and concave surfaces, respectively. The convex surface and concave surface in longitudinal section in the form of a semicircle.

The ratio of the radius R of the convex surface of the wide corrugations 4 to the radius r of the convex surface of the narrow corrugations 5 are selected in the range of 1.1-1,49.

The bellows 1 can be made of at least one high Flexi hose relative to the other bumps. Height H high corrugations selected satisfies the relation of 1.0<H/h<2,5, where h is the height of the other corrugation.

Deaf end 3 of the bellows 1 can be biased by the supply of the compensator housing 9 and a spring 10 (Fig 3). The housing 9 is mounted on the sleeve 7. The spring 10 is installed in the gap between the blind end face 3 and the housing 9.

The expansion joint to smooth the pulsations of the fluid (figure 4, 5) may contain the bellows 1, completed at least two bellows elements 11 and 12 are arranged coaxially and are intended for the message of their internal cavities with cavity chambers (figure 4 and 5 not shown). The camera can be used in the pump chamber or the highway for transferring liquid flow moving in the highways and devices with great speed and with pulsations amplitude-frequency instability. Bellows element of the s 11 and 12 are arranged successively one after another along their longitudinal axis and provided with bushings 13 and 14 with holes 15 and 16 respectively. The first bellows element 11 is for connecting to the camera via the first sleeve 13 with a hole 15, attached to the end of the first bellows element 11. The second bellows element 12 is connected to the first bellows element 11 through the second sleeve 14 with an aperture 16. The second sleeve 14 secured to facing each other, the ends of the first and second bellows elements 11 and 12. The other end of the second bellows element 12 is made hollow. For example, through the use of the stub 17. The effective cross-section area of the first bellows element 11 is made greater than the effective area of the cross section of the second bellows element 12.

The diameter of the hole 15 of the first sleeve 13 can be made larger than the diameter of the hole 16 of the second sleeve 14.

The compensator may be provided with a stop 18 and the housing 19 (figure 5). The housing 19 is located on the outside of bellows elements 11 and 12 and secured to the outer surface of the first sleeve 13. The stop 18 is installed in the housing 19 with the provision of support on the dull end of the stub 17 of the second bellows element 12.

The stop 18 may be made adjustable by providing the possibility of changing the length L1and L2bellows elements 11 and 12 along their longitudinal axis.

In addition, the width of one corrugation of the bellows elements, for example, the first bellows element 11 may be the implementation of the s more than the width of the corrugation of the other bellows element, for example, the second bellows element 12 (figure 4, 5).

At least one of the bellows elements, for example, the first bellows element 11 may be made of at least one wider Flexi hose than others of the corrugations (figure 4).

At least one of the bellows elements, for example, the second bellows element 12, may be executed, at least one higher Flexi hose than others of the corrugations (figure 4, 5).

The compensator (figure 1) works as follows.

When the pulsation of the fluid in the chamber, for example, in the circuit of the low-pressure pump when the pressure to 2 kg/cm2it through the open end 2 of the bellows 1 is fed into it and pulsating jet affects a narrow corrugations 5 and a wide corrugation 4, causing the bellows 1 to spring up in the direction of pressure of the jet and to be compressed when the pressure of the jet. When choosing the width T wide corrugations 4 satisfies the relation of 0.1<T/t<1,5, where t is the width of the narrow corrugations 5, as the test showed, it is possible to effectively smooth out the pulses in a wide frequency range. Beyond these limits, of course, is the leveling. However, as the test showed, at a given value of the smoothing coefficient KC specified range of sizes for wide width of the corrugations with respect to the width in the fir of the corrugation is optimal.

Since the bellows 1 has a wide corrugation 4 narrow geometry of the corrugation 5 and a wide corrugations 4 changed the nature of the load on the narrow corrugations 5 and the bellows 1, regardless of the form of the corrugation of the bellows (in longitudinal section, triangular, made in the form of a trapezoid, or with an oval wall) length and diameter of the bellows 1, and places the location of wide bumps 4. Increased stability of the bellows 1, which is loaded by internal pressure and axial force, as well as stabilizing and leveling in a wide range of amplitudes and frequencies of the pulsations. Wide flute 4 are more susceptible to compression-expansion compared with the narrow corrugations 5, but its width is just selected to provide the greatest leveling in a wide frequency range. Narrow corrugations 5 are symmetrical load distribution and with the same stroke, regardless of the frequency characteristics of the pulsations, other geometric dimensions of the corrugation, their number and symmetry of the arrangement. When the flow of liquid streams in broad ripple 4 is the differential pressure, which dampens the energy flow and reduces pressure on the narrow corrugations 5, so setting the valve at the inlet of the bellows 1 is not required. Without the installation of the valve is achieved by increasing the pressure in the working chamber and maintaining the excess fluid pressure at the optimum working the level.

When performing the walls of the corrugation of the bellows 1 mating convex and concave surfaces in the form of a semicircle is possible to reduce the load on the critical locations of the structure and plot of the intensities of the individual narrow corrugation 5 and broad ripple 4 has a smooth character, and approximately the same value. Due to this, it is possible to reduce the stress concentration at the vertices of a convex and concave surfaces of a wide corrugations 4 and to the fullest extent to ensure the redistribution of loads in narrow corrugation 5.

To meet the specified relation T/t width wide corrugations 4 and narrow corrugation 5 the ratio of the radius R of the convex surface of the wide corrugations 4 to the radius r of the convex surface of the narrow corrugations 5 must be selected in the range of 1.1-1,49.

The bellows 1 can be made of at least one high Flexi hose relative to the other bumps. The transformation of the height of any of the corrugation of the bellows 1 also allows you to change the stiffness of the bellows 1 and the speed wide corrugations 4 and narrow corrugation 5. As the test showed, the size N is selected based on the specific dependence of the pressure change in the chamber (6, 8). For effective smoothing of the ripple height H high corrugations may be selected to satisfy the relation of 1.0<H/h<2,5, where h is the height of the other corrugation.

Deaf end 3 of the bellows 1 can be biased by spring 10 (Fig 3). Since the coils is rugini 10 have different stroke for different excess pressure of the fluid inside the bellows 1, this construction allows to effectively smooth out the maximum value of the amplitude of the pulsations.

The design of the compensator can have two bellows element 11, 22 (4, 5) or more bellows depending on the nature of the frequency and amplitude of pulsation, which is required to compensate for the specific equipment. Each of the steps bellows elements 11 and 12 is calculated based on its frequency and amplitude ripple component of the fluid flow in the chamber or in the working line pressure and affects the pulsation of the fluid flow (liquid), reducing the frequency of the beating and the ripple amplitude, keeping the excess pressure at the optimum working level. Each of the steps with the first bellows element 11 and the second bellows element 12 is a bellows cavity for flowing at high speed (the speed of sound in the fluid) of the working environment. When the pulsations of the fluid through the openings 15 and 16 fills the cavity of the bellows elements 11 and 12 and bellows elements 11 and 12 of the bellows 1 interact with pulsating fluid in its amplitude and frequency range.

From the geometric dimensions of the first and second bellows elements 11 and 12, as well as their relations directly change the power, frequency and amplitude characteristics of the bellows cavity.

The liquids is ü through the inlet channel cross-section and 1holes 15 enters the volume of the first bellows element 11 and fills it. Through transition channel cross-section and2holes 16 fluid fills the volume of the second bellows element. Excess fluid pressure acts on the wall of the bellows 1. When exposed to excessive pressure bellows 1 changes its geometrical dimensions: increasing the length of the first and second bellows elements 11 and 12, the reduced cross-sectional area of each bellows element 11 and 12. The length of the first and second bellows elements 11 and 12, as well as their cross-sectional area is changed to a different value, since the rigidity of the first and second bellows elements are different. The volume of the first and second bellows elements 11 and 12 can be stored and preserved through cross-section and1and a2holes 15 and 16.

Since the cross-sectional area of the first and second bellows elements 11 and 12 in any time Δ t have your size is changed depending on the magnitude of the pressure in the bellows 1, then this is a changing area And will be denoted by the symbol Feffand taking it as the effective area of the cross section of the bellows 1 at a time Δ t. FeffAnd, As the cross-sectional area of the bellows 1 between the projections of its bumps.

For example, in the line of low pressure at work is e pre-supply pump, the physical properties of the surface from the effects of the plungers of high pressure at the intake of the fuel pump low pressure, there are complex pulsation and oscillation processes (6, 8)that are transmitted through the input channel in the bellows 1 (1, 3) or in the volume of the first bellows element 11 and the volume of the second bellows element 12 (figure 4, 5). A compensator responsive to a pressure change relative to the original. If the pressure in the chamber or line falls, the compensator it restores the elasticity of the bellows 1 to some value Δ R.

The maximum overpressure Δ P has the following dependency:

where ς1is the mass per unit volume of the liquid in the first bellows element 11,

ς2is the mass per unit volume of the liquid in the second bellows element 12,

L is the length of the bellows,

V is the velocity of fluid flow,

t - time interrupt (valve closing time on the highway low pressure side of the plunger).

The maximum overpressure Δ P depends on the geometric dimensions of the bellows 1, the number of bellows elements, their volumes, the physical characteristics of the fluid, such as diesel fuel. If the pressure in the main line of the low pressure fuel pump increases, the bellows 1 as an elastic system changes its dimensions and reagire the changes in the line by the amount Δ R.

The inertia of the system response to changes in pressure depend on the conduction system of the hydraulic compensation. This is the acoustic conductivity μ it also characterizes the response of the compensator to a pressure change Δ R and is expressed by the following ratio:

where μ for the first and second bellows element 11 and 12 has its value, because each stage has its geometrical dimensions and its design, in particular the width of the corrugation. Depending on size μ each step of the expansion joint, the first and second bellows elements 11 and 12 respond to a specific frequency pulsations. It depends on the frequencies of the compensator (each step).

Frequency fnnatural vibrations-speed (one of the bellows elements) of the compensator can be represented by the expression:

where C is the speed of sound in the liquid,

π =3,14,

V is the velocity of fluid flow,

L is the length of the bellows 1 or, respectively, the length L1and length L2the first or second bellows element 11 or 12,

FeffA, where a is the cross-sectional area of the bellows 1 (figure 1) between the projections of its corrugation or the effective area of the first or second bellows element 11 or 12, respectively, FAFand FAF (figure 4).

Frequency fnmore depends on the linear length of the bellows 1, and if:

the frequency fnnatural vibrations bellows resonator is expressed by the equation:

And iffrequency fnnatural vibrations bellows cavity

This allows you to design the compensator, responsive to the leveling in a wide frequency range by choosing the appropriate number of steps bellow element.

From the geometrical dimensions and their relationship, from the geometry used bellows elements and their parameters depend on power, frequency-amplitude characteristics of the bellows cavity and, accordingly, the compensator as a whole.

The smoothing coefficient ripple (COP) is a very important indicator and can be expressed by the equation:

where FeffA, where a is the cross-sectional area of the bellows between the projections of its bumps.

The COP depends on the area of Feffeffective cross-section of the bellows 1 and the sectional area and the inlet bushing (figure 1) or, respectively, Feffthe first and second bellows elements 11 and 12 and their sections by a1and a2(figure 4).

The ratio of the camera is the implementation of the bellows compensator KC should be the maximum for each structural model of the compensator. This parameter KS is most effective when it is within certain relations:

These values characterize the ratio of the sectional area of the inlet channel compensator to the effective cross-sectional area of applied bellows 1 in cross section. Feffvariable at each point in time, the compensator, and it depends on the axial load from the frequency-amplitude pulsation of the fluid and the volume of the bellows 1, and the magnitude of the excess pressure of AR.

When performing compensator in option two bellows elements 11 and 12 to smooth out pulsations in a wide range of amplitudes and frequencies is necessary and sufficient that the area of the effective cross-section of one of the bellows elements was chosen larger than the effective area of cross section of another bellows element. The width T wide corrugations of at least one of the bellows elements must be selected to satisfy the relation of 1.0<T/t<1,5. In this case, by setting, in accordance with the technical conditions, thermal stabilization of the pulsations of the COP, you can determine the diameters of the holes 15 of the first sleeve 13 and the holes 16 of the second sleeve 14.

As shown by experimental studies, the frequency and amplitude parameters of smoothing of the ripple depends on the number of bumps and their geometrical is of such size, because directly the dimensions of the corrugation determine their working stroke (shock-absorbing properties of the first and second bellows elements 11, 12 of the smoothing).

The width of the corrugation of one of sylvannia elements, for example, the first bellows element 11 can be made larger than the width of the corrugation of the other bellows element, for example, the second bellows element 12 (figure 4, 5). Experiments have shown that the higher the COP, the more you need a wide corrugation.

At least one of the bellows elements, for example, the first bellows element 11 may be made of at least one wider Flexi hose than others of the corrugations (figure 4). In addition, one of the bellows elements, for example, the first bellows element 11 (figure 5) can be made equal to the width of the corrugations, which are selected wider than the corrugations of the second bellows element 12, and the width of the corrugation of the first bellows element 11 relative width of the corrugation of the second bellows element 12 satisfies the specified ratio T/t. The corrugations of one of the bellows elements, for example, the second bellows element 12 can be made of different heights (figure 4, 5).

The operation of the device figure 5 is similar to the design in figure 4, the stop 18 prevents the stretching of the corrugation of the second bellows element 12 at the maximum pulsation, and they options onerous primarily in compression. In this case, the second bellows element 12 in addition to compensating function additionally performs the function of a spring 10 (Fig 3) At the same time, if the stop 18 is made adjustable, the design (figure 5) allows you to change the length L1and L2the first and second bellows elements 11, 22 along their longitudinal axis, thereby to change the frequency fnnatural oscillations of the resonators and to provide fine-tuning their frequency ranges.

Examples of specific embodiment of the invention.

Example 1.

The estimated parameters of the compensator is designed based on the bellows 1 with an outer diameter of 38 mm and with one wide Flexi hose 4 (figure 1) were confirmed during experimental tests in the laboratory KAMAZ pump series 337.

When the mode of operation of the engine at full speed (from 75 to 1000 rpm camshaft injection pump), which corresponds to the start of the engine in the trunk of the low-pressure fuel is supplied under pressure 0,57-0,61 bar. It is not enough for reliable starting of the engine, especially at low temperatures. The process is characterized by znachitelnie pulsations (6).

With manning pump-337 compensator (figure 1) the initial pressure at speeds of 75 -100 min-1-in the line of low pressure at the time of start of the engine is increased to from 0.88 to 0.96 bar, making it easier to start the engine. The pressure tank is VA in line injection pump within 1 bar promotes fullness podprumerny volumes, stabilizes the operation of the pump at all engine operating conditions. The compensator allows for 20-25% to compensate for fluctuations in the fuel pressure line low pressure pump (7). The dependence of the frequency of revolutions of the engine shown in figure 10, where Δ and a solid line shows a graph without compensator, and a dotted line with the compensator. The pressure changes depending on the speed shown figure 11. As you can see (11), the pressure in the line increases and excluded not increase pressure for standard equipment in the range of about 450-700· min-1. The analysis shows that when using the compensator has not only changed the occupancy rate of the fuel rail, but also changed the frequency of the pulsations at the optimum pressure, which corresponds best to the preparation of fuel for injection into the cylinders and education optimal mixture for combustion. Thus by increasing the speed of the Cam shaft pump frequency processing fuel is not reduced, This implies an optimal preparation and fuel flow to the working cylinders during the starting mode of the engine that will have a positive impact when operating the diesel engine at low temperatures.

Example 2.

In the operation of injection pump series 334 in the mode of revolutions of the Cam shaft from about 600-900-1there is a sharp pressure drop in the line low on the effect. This is the effect in which the high - pressure plungers not datapoints and are inefficient load. Uneven filling of the high-pressure line and magforcenano space.

The use of the compensator (4) serially connected first and second bellows elements 11, 12, with a diameter of 38 and 28 mm, respectively, significantly reduces the pressure drop in this interval speed (Fig), where Δ and a solid line shows a graph without compensator, and a dotted line with a compensator, and to maintain the operating pressure in the pipeline 1.3 bar (without the use of a compensator pressure drop occurred up to 1 bar - level trigger).

The use of adjustable stiffness emphasis 18 two-stage compensator (figure 5) on the basis of the first and second bellows elements 11, 12, is made with a diameter of 28 mm and 20 mm respectively, leads to more reliable stabilization of pressure (Fig), with a more linear maintaining the operating mode from 700 to 900 rpm-1level 1,22 bar, whereand a solid line shows a graph with nepopalim bellows 1, andand in broken lines preloaded with 60% bellows 1.

In addition to stabilizing the pressure improves (increases) the frequency-amplitude fuel processing and preparation of the th injection. The characteristic dependence of the pulsation (pressure changes in the line) in time without compensator with compensator, made on the basis of two bellows elements 11, 12, shown respectively at Fig, 9.

Thus, the compensator is made that reduce a ripple fluctuations arising from the operation of the pump, and vibration of the bellows.

By choosing the appropriate dimensions wide corrugations 4 does not occur resonant phenomena that affect the durability of the bellows 1. This will have a positive impact on the preparation of the fuel prior to its injection into the cylinders. As a result of hydrocompression fuel is increasing and the average pressure in the low pressure circuit, which eliminates the peaks and dips fuel pressure regardless of engine speed and will have a positive effect when starting the engine in cold season and improve his work on transient conditions.

Most successfully claimed the compensator is industrially applicable in various machines and mechanisms, in camera or highway which fluid is non-uniformly, for example, to compensate for the pressure pulsations of fuel in the low pressure circuit of the fuel high-pressure pump (injection pump).

1. The expansion joint to smooth the pulsations of the liquid containing at least one bellows, the open end of which p is adnanced to connect to the camera through the sleeve, the opposite end of the bellows is made hollow, and the bellows is made of at least one wide Flexi hose relative to its narrow corrugation, and the width T wide corrugations selected satisfies the relation of 1.0<T/t<1,5, where t is the width of the narrow corrugations.

2. The compensator according to claim 1, in which the walls of the corrugation of the bellows is made in the form of rings arranged perpendicular to the longitudinal axis and connected between the convex surfaces and concave surfaces, respectively, and the convex surface and concave surface in longitudinal section in the form of a semicircle, and the ratio of the radius of the convex surface wide corrugations to the radius of the convex surface of the narrow corrugations is selected in the range of 1.1÷1,49.

3. The compensator according to claim 1, in which the bellows is made of at least one high Flexi hose relative to the other of the corrugation, and the height H high corrugations selected satisfies the relation of 1.0<H/h<2,5, where h is the height of the other corrugation.

4. The compensator according to claim 1, in which the hollow end of the bellows is spring-loaded.

5. The compensator according to claim 1, in which the bellows is made of at least two bellows elements arranged coaxially and intended for the message of their internal cavities with cavity chambers and bellows elements are arranged successively one after another along their longitudinal axis and provided with bushings with holes and, the first bellows element is designed to connect to the camera through the first sleeve with a hole, fixed on its edge, the second bellows element connected to the first bellows element through the second sleeve with the hole, secured to facing each other, the ends of the first and second bellows elements and the other end of the second bellows element is made hollow, and the effective area of the cross section of one of the bellows is greater than the effective area of cross section of another bellow element.

6. The compensator according to claim 5, in which the effective cross-section area of the first bellows element is made greater than the effective area of the cross section of the second bellows element, and the bore diameter of the first sleeve is made larger than the hole diameter of the second sleeve.

7. The compensator according to claim 5, which is fitted with an emphasis and a casing on the outside of bellows elements and mounted on the outer surface of the first sleeve, and a stop mounted in the housing with the provision of support on the dull end of the second bellows element.

8. The compensator according to claim 7, in which the emphasis is made adjustable by providing the possibility of changing the length of the bellows elements along their longitudinal axis.

9. The compensator according to claim 5, in which the width of one corrugation of the bellows elements are made in the bol is Shay, than the width of the corrugation of the other bellows element.

10. The compensator according to claim 5, in which at least one of the bellows elements are made of at least one higher Flexi hose, other than his flute.



 

Same patents:

Pipeline transport // 2245487

FIELD: pipeline transport.

SUBSTANCE: pipeline transport has inner pipe whose at least one flexible wall is provided with at least one movable diaphragm in order to damp gas pressure oscillations. The density and pressure inside the damper space and main pipeline should be as follows ρ12, p1<p2 where ρ1 and p1 are density and pressure of gas in the space of damper and ρ2 and p2 are density and pressure of gas in pipeline, in kg/m3 and Pa, respectively. The total area of the diaphragm shell is determined from the formula where S is the total area of the diaphragm shell, m2, F is the area of the cross-section of the main pipeline, m2, m is the mass of the unit area of diaphragm, kg/m2, l is the length of the main pipeline, m, ρ is the density of gas in the main pipeline, kg/m3, K is the coefficient allowing for the properties of gas in the pipeline (temperature, humidity, and so on) and interpipe space as well as operation factors (service life, efficiency of piston machine and others), K>1.

EFFECT: prolonged service life of pipeline transport.

1 cl, 3 dwg

The invention relates to the field of protection measuring equipment (gauges, recording equipment and automation systems from vibrations and shock waves produced when the hydraulic system type pump equipment - pipeline

The invention relates to mechanical engineering and can be used in valves for damping pressure pulsations of the working environment

The invention relates to a device for damping pressure pulsations in piping systems and can be used in injection systems, water supply and land reclamation

The invention relates to mechanical engineering and can be used to enhance the security of the loaded pressure of the pressurized system fluid used in nuclear, chemical and other industries

The invention relates to dampers pulsation of the liquid and can be applied in the oil, gas and other industries

The invention relates to a device for damping pressure pulsations in piping systems TTD and can be used in pipeline systems for water supply and land reclamation

Radiator // 2177581
The invention relates to cooling devices and can be used as an intermediate element when connecting the pressure transducer to the backbone of the medium

The invention relates to pipeline transport and is used to compensate for the relative movements of the sections of the pipeline, interconnected thin-walled bellows, made of Maraging steel in the form of an annular corrugation and two cylindrical walls, reinforced with outer side of the winding

The invention relates to construction and is used in the construction and repair of pipelines

Thermal compensator // 2225563
The invention relates to construction and is used in the construction of pipelines, power equipment

The invention relates to the construction and used for the construction of pipelines, primarily studs gazoneftepererabatyvayuschy stations

The invention relates to the construction and used for the construction of pipelines

Bellows // 2219420
The invention relates to the construction and used for the construction of pipelines, as well as in instruments and mechanisms to compensate for vibrations and temperature fluctuations
The invention relates to the construction used in the manufacture of pipelines

The invention relates to the construction and used for the construction of pipelines, such as drainage piping hydro

The invention relates to construction and is used in the construction and repair of pipelines on landslide areas

The invention relates to the field of engineering and is used to compensate for thermal movements and vibration transmitted from the internal combustion engine system exhaust

FIELD: pipe line transport; pipe lines at irregular delivery of liquid.

SUBSTANCE: proposed compensator includes at least one bellows whose open end is used for connection with chamber by means of bush; opposite end of bellows is blind. Bellows has at least one wide or high corrugation. Compensator may include at least two members located coaxially and intended for communication of their inner cavities with chamber. Bellows members are located one after another along their longitudinal axis and are connected by means of bushes having holes. Sizes of corrugations are indicated in Specification.

EFFECT: extended field of application.

10 cl, 13 dwg

Up!