Supply system for positive-displacement hydraulic drive

FIELD: fluid-pressure actuators.

SUBSTANCE: supply unit comprises hydraulic accumulator, housing, and slide of the reduction valve which is mounted in the housing to define pressure, drain, and reduced pressure spaces. The slide is mounted for permitting disconnection of the pressure space from the reduction space. The hydraulic accumulator is connected with the housing from the side of the space of the reduction pressure. The safety valve is interposed between the space of the reduced pressure and the drain space. The trough opening that connects the space of the reduced pressure with the space of the safety valve is made along the axis of the slide. The safety valve is mounted in the drain space for permitting it to be pressed to the face surface of the slide by means of its spring. Between the pressure space and pressure line is the check valve that prevents the fluid to flow into the pressure line. The slide is made of the direct-action valve provided with the shank that is inserted in the drain space. The part of the slide that is opposite to the shank is diverging from the shank body and bears on the seat defined by the projections on the housing. The area of the inner section defined by the line of contact between the seat and slide of the reduction valve is greater that that of the inner section defined by the line of contact between the face part of the slide shank and safety valve.

EFFECT: enhanced reliability.

8 cl, 2 dwg

 

The invention relates to the field of hydraulic equipment, namely, devices for regulating the volume of hydraulic drives.

Known power supply (catalog firm Mannesmann Rexroth RE 64571/11 .94; a Hydraulic actuator construction, road and municipal machine". The catalogue, ed. CJSC "Hydrocomplex", JSC Machmir", Moscow, 1997, p.139-141), consisting of logical valve type "OR"permeable to the flow of the working fluid in the presence of pressure in one of the inlet hose with simultaneous locking of the other supply hydroline; pressure reducing, pressure relief, check valves; hydropneumatic accumulator, in which the storage and return of energy occurs due to the compression and expansion of gas.

Use rechargeable power packs eliminates the need to install a special pump with elements of its drive, safety valve, suction and pressure lines, since in this case the power system hydraulic control is carried out from the discharge hose of the pump.

In the initial period of the spools of the valves are switched due to the discharge of the hydropneumatic accumulator, which is charged through a pressure reducing valve when there is pressure in the pressure hydroline one of the pumps.

Pressure reducing valve controls the pressure at its output, the I the d pressure reducing valve connected to the working pressure. For connectivity, the pressure reducing valve to multiple lines, it is equipped with valves "OR".

Pressure reducing valve - a valve spool type, so it has a leak in the gaps of the rolling element, so before accumulator check valve. The presence of the check valve in the known design of the power supply caused by the need to prevent leakage of working fluid from the accumulator when working (pressure) line pressure lower than the hydraulic accumulator.

The presence of a safety valve provided in case of failure of the pressure reducing valve.

The power supply is formed by the cavity of the reduced pressure and the command cavity.

The disadvantage of this power supply design is the complexity, which reduces the reliability of its work; and low efficiency due to the leakage through the spool valve (slide valve).

Known power supply of the hydraulic drive (A.S. USSR №1288385; a Hydraulic actuator construction, road and municipal machine". The catalogue, ed. CJSC "Hydrocomplex", JSC Machmir", Moscow, 1997, str-143), comprising a housing in which is installed with the formation of the pressure cavity, the reduced pressure and the mechanical command and drain cavities, spring-loaded side of the drain cavity pressure reducing valve to the Apana, in the body of which is made of the damping hole for the message command cavity with the cavity of the reduced pressure, and on its surface a groove for the message of the pressure cavity and the cavity of the reduced pressure with the possibility of dissociation of these cavities cut-off edge of the groove, a relief valve with a shut-off body defined between the cavity of the reduced pressure and drain the cavity, and a check valve. In the body of the valve made an extra hole communicated with the cavity of the reduced pressure facing the end surface of the spool from the side of the drain cavity and a stop valve safety valve installed in the drain cavity with preload to the end surface of the valve spring of the latter. In addition, on the surface of the valve that separates the cavity of the reduced pressure and drain the cavity, a radial hole extending in an extra hole, and the distance from the edge of the radial holes from the drain cavity to shut-off the edges of the grooves of the spool less than the distance from the discharge cavity to drain.

Block in A.S. No. 1288385 selected as a prototype.

The disadvantage of this unit is low efficiency due to the presence of leakage through the valve, and low reliability, due to the complexity of the design the AI.

Block design in A.S. No. 1288385 assumes the presence of a check valve between the hydraulic accumulator (not entered in the formula) and the cavity of the reduced pressure. The presence of the check valve due to the need to prevent leakage of working fluid from the accumulator through the valve when in the working (pressure) line pressure lower than the hydraulic accumulator.

The problem solved by the invention is the improvement of reliability of power supply hydraulic drive by simplifying its structure, as well as increase efficiency by eliminating leakage through the valve.

The problem is solved in that the power unit hydraulic drive containing a hydraulic accumulator, a casing in which is installed with the formation pressure, the discharge cavity and the cavity of the reduced-pressure spool, pressure reducing valve, spring-loaded side of the drain cavity, the valve is installed with the possibility of disconnection of the pressure cavity and the cavity of reduced pressure; a hydraulic accumulator connected to the housing from the cavity of the reduced pressure; a relief valve mounted between the cavity of the reduced pressure and drain cavity; along the axis of the spool is a through hole, indicating a reduced cavity pressure and cavity pressure relief valve installed Slavnoi cavity with preload to the end surface of the valve spring last; between the discharge cavity and the discharge line check valve that prevents flow of the working fluid in the pressure line according to the invention the spool-type valve direct acting with a shank extending into the drain cavity, opposite the shank portion of the valve is made extending from the body of the shank and resting on the saddle formed by the protrusions of the housing; the area of the inner section formed by the line of contact of the valve seat and valve pressure reducing valve is greater than the area of the inner section formed by the line of contact of the mechanical part of the shank of the valve and the safety valve.

You can perform the opposite shank parts of the valve spring, while the elastic element is weaker against the spring, clamped valve from the drain cavity.

In the body of the shank along the line of its contact with the body may establish a seal.

You can chassis a composite.

According to the second variant in the power unit hydraulic drive containing a hydraulic accumulator, a casing in which is installed with the formation pressure, the discharge cavity and the cavity of the reduced-pressure spool, pressure reducing valve, spring-loaded side of the drain cavity, the valve is installed with the possibility of disconnection on the priori cavity and the cavity of reduced pressure; a hydraulic accumulator connected to the housing from the cavity of the reduced pressure; a relief valve mounted between the cavity of the reduced pressure and drain cavity; along the axis of the spool is a through hole, indicating a reduced cavity pressure and cavity pressure relief valve installed in the drain cavity with preload to the end surface of the valve spring; pressure between the cavity and the discharge line check valve that prevents flow of the working fluid in the pressure line according to the invention the spool-type valve direct acting with a shank extending into the drain cavity, opposite the shank portion of the valve is made extending from the body of the shank and resting on the saddle, formed by the projections of the bushing mounted in the housing along the axis of the spool; however, the area of the inner section formed by the line of contact of the valve seat and valve pressure reducing valve is greater than the area of the inner section formed by the line of contact of the mechanical part of the shank of the valve and the safety valve.

Opposite the shank portion of the valve can be performed spring, with the elastic element is weaker against the spring, clamped valve from the drain cavity.

In the body of the shank along the line of its contact with the bushing may establish a seal.

You can chassis a composite.

In the inventive power unit hydraulic drive spool has not two, as in the known devices, and one of the adjusting edge - line of the contact opposite to the shank part of the valve (cylinder valve) with a saddle formed by the protrusions of the case (or sleeve - the second option).

The absence of the second thrust flange eliminates leaks through the valve, as with all technological requirements to the surface quality of the valve, sitting down in the saddle, hermetically closes the cavity of the reduced pressure, securely rasamma her from the discharge cavity.

In the initial state, the valve pressure reducing valve under the action of the stronger spring installed from the discharge cavity is in the open state (raised relative to the seat).

The working fluid under pressure supplied to the power supply through the pressure line, a return valve located in the pressure line and the recess in the body of the valve into the cavity of the reduced pressure. The pressure in the cavity of the reduced pressure begins to increase. Upon reaching the pressure in the cavity of the reduced pressure value of the pressure closing pressure reducing valve, ash is nick last fall on the saddle and divides the pressure cavity and the cavity of the reduced pressure.

In the process of consumption is the reduction of pressure in the cavity of the reduced pressure, while the pressure reducing valve starts to open. The working fluid from the pressure cavity enters the cavity of the reduced pressure process is repeated.

Hydraulic accumulator provides energy storage, characterized by the magnitude of the fluid flow and pressure. In the absence of pressure in the pressure cavity for consumption (power hydraulic drive is used, the energy accumulator.

The proposed construction of a power unit hydraulic drive excluded non-return valve between the hydraulic accumulator and the cavity of the reduced pressure, which in known constructions prevents leakage of hydraulic accumulator in working (pressure) line unit when the pressure is lower than the hydraulic accumulator. In the inventive construction, when the pressure in the working (pressure) lines is lower than in the accumulator under the action of fluid flow from the hydraulic accumulator pressure reducing valve down on the saddle securely rasamma cavity reduced pressure and line pressure, eliminating thereby the flow of the working fluid from the hydraulic accumulator.

In addition, in the inventive design of the power unit hydraulic drive prevented abnormal growth pressure in the cavity of the reduced is Alenia the unauthorized receipt of fluid flow from the consumer in the opposite direction. In the result, the fluid flow may begin to flow into the hydraulic accumulator, which can lead to emergency situations.

For admission (non-standard situations) flow from consumers in the cavity of the reduced-pressure working fluid through the opening in the valve pressure reducing valve enters the cavity of the safety valve, when the pressure level of the opening moves away from the end of the shank (opens) and the liquid flows into the drain cavity.

In the known solutions the design of the block is not protected from the consequences of such a process.

To ensure power supply in the whole area of the inner section formed by the line of contact between the saddle and the head of the valve pressure reducing valve is made larger than the area of the inner section formed by the line of contact of the mechanical part of the shank of the valve and the safety valve. The ratio of the above sections provides the closed state of the safety valve during normal operation of the unit, because the force from the pressure of the fluid flow on the part of the valve, opposite the shank head valve will exceed the force from the pressure relief valve of the fluid supplied to the safety valve through the hole in the spool. The closed position will prevent the high valve during normal operation of the unit (pressure reducing valve) is provided also by that spring from the drain cavity stronger than the spring-side cavity of the reduced pressure.

In order to more reliably prevent leaks in the shank along the line of its contact with the inner surface of the case (or sleeve on the second version) is hosted seal.

To simplify the design of the unit is achieved due to the fact that the pressure reducing valve is designed as valve direct acting, spool which has not two, but one of the adjusting edge. For this purpose, the spool-type valve direct acting with a shank extending into the drain cavity. Opposite the shank portion of the valve is made extending from the body of the shank, to ensure the landing pressure reducing valve to the seat. The valve is mounted so that the upper part of the valve, opposite the shank, the head of the valve, placed in the cavity of the reduced pressure, and through a bore made in the shank provides for the communication of the pressure cavity and the cavity of the reduced pressure during operation of the unit.

The user flow of the working fluid is fed from the cavity of the reduced pressure.

The hydraulic accumulator is installed with the possibility of flow of the working fluid in the cavity of the reduced pressure.

In the proposed design of the power supply in a situation where the t in the pressure lines will be lower than the pressure in the accumulator under the action of fluid coming from the hydraulic accumulator, the valve pressure reducing valve will descend to the saddle, rasamma cavity reduced pressure and line pressure, thus preventing the leakage flow of the working fluid from the accumulator to the pressure line and without a check valve before the hydraulic accumulator.

Thus, the increase of reliability of power supply by simplifying its design, consisting in the exclusion from the design of the check valve between the hydraulic accumulator and the cavity of the reduced pressure while ensuring the health unit as a whole.

Efficiency of the power supply is enhanced by the fact that losses through the valve pressure reducing valve are practically absent, as when lowering the upper extended part of the valve (cylinder valve) on the seat (when the pressure in the reduced cavity) valve almost hermetically covers the reduced pressure cavity.

Spring mounted on the side of the head of the valve, opposite the shank, improves the process of closing the pressure reducing valve when the pressure in the cavity of the reduced pressure reaches a value equal to the closing pressure of the reducing valve. This spring provides the necessary speed reduction to the Apana in the initial moment of its movement to close.

Spring from the head of the valve selected lesser strength than the spring installed from the side of the drain cavity so that spring from the head of the valve does not impair the operation of the safety valve.

To prevent leakage of working fluid from the pressure cavity in the opposite direction it is installed check valve.

In the first embodiment of the invention the saddle formed by the notches of the body.

According to the second variant of the saddle formed by the projections of the bushing mounted in the housing along the axis of the spool. The use of bushings due to technological needs.

Both are United in one invention, because they allow to achieve the same technical result.

The set of essential features of the claimed invention, the power unit hydraulic drive (options)" is not known from the prior art, therefore the claimed invention meets the condition of patentability "novelty".

The ability to achieve the objectives declared by the set of essential features of the invention allows to make a conclusion about its compliance with the conditions of patentability "inventive step".

The ability to manufacture and industrial use of the invention allows to make a conclusion about its compliance with the conditions of patentability "prom the industrial applicability".

The invention is illustrated by drawings.

Figure 1 shows option 1 of the proposed power unit hydraulic drive.

Figure 2 shows a 2 second variant of the inventive power unit hydraulic drive.

The power supply unit in the first embodiment (figure 1) includes a housing 1, a hydraulic accumulator 2, a pressure reducing valve 3, the valve 4, springs 5 and 6. In the power unit 1 option established: the cavity of the reduced pressure 7 (combined with the command chamber, drain chamber 8, the pressure chamber 9. The pressure chamber 9 is formed at the outlet pressure (working) line 10. In the pressure line 10 check valve 11 (if a pressure of a few lines - the number of check valves will be appropriate). Pressure reducing valve 3 includes a valve consisting of a head 12 of the valve, which is part of the valve opposite the shank, and the shank 13, the spool is made a through hole 14, which tells the cavity of the reduced pressure 7 and the discharge chamber 8 with an open safety valve 4 (when it is pressed from the shank 13). The shank 13 from the pressure cavity 9 is made of the recess 15. In the body of the shank 13 to the line of its contact with the body 1 is installed seal 16. In the housing 1 of the power supply made a hole 17 through which the working fluid is supplied to the intake volume to memo the hydraulic drive. The head 12 of the valve is made extending from the shank 13. Relief valve 4 has a side drain cavity from an end face of the shank 13 and is preloaded by the spring 5. In case 1, its projections formed saddle 18. The area of the inner section formed by the line of contact of the saddle 18 and the head 12 of the valve pressure reducing valve is greater than the area of the inner section formed by the line of contact of the mechanical part of the shank 13 and the safety valve 4.

The power supply unit according to the second variant (figure 2) includes a housing 1, a hydraulic accumulator 2, a pressure reducing valve 3, the valve 4, springs 5 and 6, the pressure reducing valve. The power supply for option 2 established: the cavity of the reduced pressure 7 (coinciding with the command chamber, drain chamber 8, the pressure chamber 9. The pressure chamber 9 is formed at the outlet pressure (working) line 10. In the pressure line 10 check valve 11 (if a pressure of a few lines, the number of check valves will be appropriate). Pressure reducing valve 3 includes a valve consisting of a head 12 of the valve, which is part of the valve, opposite the shank, and the shank 13, the spool is made a through hole 14, which tells the cavity of the reduced pressure 7 and the discharge chamber 8 with an open safety relief valve (when he is at from the shank 13). The shank 13 from the pressure cavity 9 is made of the recess 15. In the body of the shank 13 to the line of its contact with the body 1 is installed seal 16. In the housing 1 of the power supply made a hole 17 through which the working fluid is supplied to the intake volumetric hydraulic drive. The head 12 of the valve is made extending from the shank 13. Relief valve 4 has a side drain cavity from an end face of the shank 13 and is preloaded by the spring 5. The body 1 is installed sleeve 19 along the axis of the spool. The saddle 20 is formed by protrusions of the sleeve 19. The area of the inner section formed by the line of contact of the saddle 20 and the cylinder 12 valve pressure reducing valve is greater than the area of the inner section formed by the line of contact of the mechanical part of the shank 13 and the safety valve 4. In the sleeve 19 made a hole 21 through which the working fluid from the pressure line 10, the check valve 11, the pressure chamber 9 flows into the recess 15.

The operation of the power supply by the first and second options is as follows.

In the initial state, the pressure reducing valve is open (the head 11 of the valve is raised above the saddle), since the spring 5 is stronger against the spring 6.

In nominal mode, the working fluid under pressure flows from the pressure line 10, through the check valve 11 vyparnoy cavity 9, the recess 15 and through the open pressure reducing valve into the cavity of the reduced pressure 7.

According to the second variant of execution of a block of the working fluid from the discharge cavity is supplied to the bore 15 of the valve through the hole 21 made in the sleeve. The pressure in the cavity of the reduced pressure 7 begins to grow and achieve its up to values required for closing the pressure reducing valve 3, the latter begins to close, and the head 12 of the spool is lowered onto the saddle(the saddle - this saddle 18 in the first embodiment, the execution of a block or saddle 20 according to the second variant the execution of a block). The working fluid under pressure is supplied to the intake through the hole 17. In the process of consumption is the reduction of pressure in the cavity of the reduced pressure 7, while the pressure reducing valve starts to open (the head of the spool 12 is raised relative to the seat).

Since the area of the inner section formed by the line of contact between the saddle and the head 12 of the valve pressure reducing valve is greater than the area of the inner section formed by the line of contact of the mechanical part of the shank 13 and the safety valve 4, the force from the pressure of the working fluid on the head 12 of the valve exceeds the force from the pressure relief valve 4. In addition, the relief valve 4 is preloaded by a spring 5, which is stronger than the spring 6, to face the front part of the shank 13. All this leads to the closed state of the safety valve 4 at rated operation power at which the liquid from the cavity of the reduced pressure 7 is not supplied to the discharge chamber 8. I.e. in nominal mode of operation of the relief valve 4 is not functioning.

When jamming of the spool in the housing 1, for example due to falling into the gap between them of mud particles, comes the emergency operation mode of the power supply. The working fluid under pressure supplied from the pressure cavity 9 into the cavity of the reduced pressure 7. Through the hole 14, the fluid is supplied to the safety valve 4. As soon as the force from the action of the pressure relief valve 4 will exceed the force of the compression spring 5, a relief valve is shifted relative to the shank 13 along its axis, and the working fluid through the opening 14 merges into the cavity 8. This ensures protection of the power supply from the emergency of the pressure rise inside him.

In the event of unauthorized receipt of fluid flow from the consumer through the opening 17 into the cavity of the reduced pressure 7 pressure begins to increase and the pressure reducing valve under the action of this pressure closes. Next, the flow through the hole 14 is supplied to the safety valve 4. As soon as the force from the action of pressure on protection from rough is sustained fashion, the valve 4 will exceed the force of the compression spring 5, the safety valve is shifted relative to the shank 13, and the working fluid through the opening 14 merges into the cavity 8. This ensures protection of the power supply from increased pressure inside the unauthorized flow of liquid from the consumer in the opposite direction - in power supply.

In the absence of pressure in the pressure cavity 9 on the consumption of the energy accumulator 2, from which the flow of liquid through the hole 17 is served for consumption.

1. The power unit hydraulic drive containing a hydraulic accumulator, a casing in which is installed with the formation pressure, the discharge cavity and the cavity of the reduced-pressure spool, pressure reducing valve, spring-loaded side of the drain cavity, the valve is installed with the possibility of disconnection of the pressure cavity and the cavity of reduced pressure; a hydraulic accumulator connected to the housing from the cavity of the reduced pressure; a relief valve mounted between the cavity of the reduced pressure and drain cavity; along the axis of the spool is a through hole, indicating a reduced cavity pressure and cavity pressure relief valve installed in the drain cavity with preload to the end surface of the valve spring; between the pressure cavity is and discharge line check valve, preventing the flow of working fluid in the pressure line, wherein the spool-type valve direct acting with a shank extending into the drain cavity, opposite the shank portion of the valve is made extending from the body of the shank and resting on the saddle formed by the protrusions of the housing; the area of the inner section formed by the line of contact of the valve seat and valve pressure reducing valve is greater than the area of the inner section formed by the line of contact of the mechanical part of the shank of the valve and the safety valve.

2. The unit according to claim 1, characterized in that opposite to the shank part of the valve spring made, with the elastic element is weaker against the spring, clamped valve from the drain cavity.

3. The unit according to claim 1, characterized in that in the body of the shank along the line of its contact with the housing installed seal.

4. The unit according to claim 1, characterized in that the casing is made of a compound.

5. The power unit hydraulic drive containing a hydraulic accumulator, a casing in which is installed with the formation pressure, the discharge cavity and the cavity of the reduced-pressure spool, pressure reducing valve, spring-loaded side of the drain cavity, the valve is installed with the possibility of disconnection of the pressure cavity and the cavity d is Zirovnica pressure; a hydraulic accumulator connected to the housing from the cavity of the reduced pressure; a relief valve mounted between the cavity of the reduced pressure and drain cavity; along the axis of the spool is a through hole, indicating a reduced cavity pressure and cavity pressure relief valve installed in the drain cavity with preload to the end surface of the valve spring; pressure between the cavity and the discharge line check valve that prevents flow of the working fluid in the pressure line, wherein the spool-type valve direct acting with a shank extending into the drain cavity, opposite the shank portion of the valve is made extending from the body of the shank and resting on the saddle formed by the projections of the bushing mounted in the housing along the axis of the spool; however, the area of the inner section formed by the line of contact of the valve seat and valve pressure reducing valve is greater than the area of the inner section formed by the line of contact of the mechanical part of the shank of the valve and the safety valve.

6. The unit according to claim 4, characterized in that opposite to the shank part of the valve spring made, with the elastic element is weaker against the spring, clamped valve disc with the pile-drain cavity.

7. The unit according to claim 4, characterized in that in the body of the shank along the line of its contact with the bushing installed seal.

8. The unit according to claim 5, characterized in that the casing is made of a compound.



 

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