Gas pressure regulator

 

(57) Abstract:

The invention relates to automatic control and can be used in pneumatic systems for various purposes. The technical result of the invention is the extension of the range of output pressures towards lower values. The regulator has a housing 1 with an inlet 2 and outlet 3 cavities separated by the first valve 5. The first sensor element in the form of a stepped piston 6 and the second sensing element piston 10 associated with the second 15 and third valves 19, cause the reaction to the output pressure and by filling-operaniuni cavities provide a correction output pressure and precise control. The ratio of the structural parameters allows to obtain the minimum possible output pressure, and the formula, you can determine its value. The technical result of the invention is achieved by applying these ratios and formulas. 1 Il.

The invention relates to automatic control and can be used in pneumatic systems for various purposes.

A known gas pressure regulator, comprising a housing placed between the input and vikaparshina, the lower stage of which is connected with the first valve and forms with greater tread and casing a first chamber which is communicated through an orifice to the atmosphere. There is a second sensitive element in the form of a piston, a spring-loaded tasks, and a second chamber which is communicated with the output cavity and through the second valve with the first cavity. Moreover, the piston is placed in the sleeve that is installed in the housing between the piston and the larger step of the stepped piston and provided with a seat of the second valve, which is located in the piston, the second chamber is formed by a piston and sleeve, which made the saddle of the third valve, placed in the sleeve, which forms a greater degree of the stepped piston of the third cavity. While the second and the third cavity communicated through the third valve, and in the initial position of the sleeve contact is connected with the piston and the large step of the stepped piston, the third valve is pressed against its seat by the piston, and the third connection of the valve with its seat in the position of their contact is made with guaranteed leak.

Listed above are the essential features of the prototype provide increased precision regulator, but there is uncertainty lower value of the output pressure is rasshirenie range of output pressures towards lower values by offering correlations of structural parameters of the controller, determining the minimum outlet pressure, and the formula that determines the value of the minimum outlet pressure, i.e., the set of features of the first claim is supplemented by the following new significant features. There are ratios

1, where F is the effective annular area of the stepped piston, perceiving the pressure in the third cavity;

Fin- the effective area of the sleeve

1, where hand- release of the first valve in the initial position;

hkr- critical (minimum acceptable) release of the first valve, in which the resistance of the output line is set to the critical output pressure Pkrsufficient impact on the area F to the support lines hkrand (Tkr+ KX) 1, where Tnand Tkr- efforts on the first valve respectively supplies a regulated mode, and when the release valve on the value of hkr;

K - spring stiffness job;

X - total spring compression job at moving the sleeve from the position corresponding to hkruntil it stops in the housing and a second sensing element of the stop positions in the sleeve to the position corresponding to the beginning of the movement of the second claerbout lower value of the output pressure, and the minimum value of the output pressure PN. minis determined by the formula

PN. min= ..

Conclusion correlation parameters and formulas for minimum output pressure.

The friction force when the output is not selected. It is assumed their account with the appropriate signs as components of the considered forces.

Let's agree that the process controller output from the reference position on the regime with the output pressure Pnis when the impedance of the output line (for example, when installing expenditure washers), providing the maximum gas flow.

The technical result of the invention is the extension of the range of output pressures towards lower values.

In the initial position of the regulator (the regulator is configured, but the input pressure is not filed) must be a minimum required Randspring task, in which the first valve can be depressed by the value of handunder the condition of Tand= RI.< / BR>
There is some minimum value of releasing hkr(critical), wherein supplying the output pressure in the output cavity may be some minimal the stage piston, and with it the first valve to its release hkr. The value of hkrmeet and Tkr= RCR.hkrcalculated using known formulas taking into account the gas flow.

Thus, the first condition for the implementation of the process controller output to the mode of regulation is the ratio

1. (1)

The second condition of the controller output to the mode control pressure Pnis force the bushings on the stepped piston, at least, to increase the pressure to a value of Pkr, i.e., PkrFPkrFinor 1 (2) where Fin- the effective area of the sleeve.

Moreover, the working conditions of the regulator (sleeve at Pnshould move all the way into the building) should be FinF2(3) where F2- the area of the second sensing element.

Further movement of the first valve on the value of

h = hn- hkrwhere hn- the valve stroke corresponding to the pressure Pnand the force on the valve Tnis increasing efforts on the first valve is set to the value T = Tn- Tkr.

The output pressure increases on the value of R = Rn- Rkr.

Prince the first valve on the value of h, i.e., to the efforts of Tn:

PFT,(4)

Since R = Rn- Rkrand Pn= , where Rnthe spring force jobs at Pn;

Pkr= ,the expression(4) can be written

- F T.. (5)

Since Rn= Rkr+ FOR (Xin+ X2), where Xin- move the sleeve from the position corresponding to hkruntil it stops in the housing (in the direction of compression springs job);

X2- the displacement of the second sensor element out of the way into the sleeve in the position corresponding to the beginning of the movement of the second valve;

Rkr= Tkrwhen the designation Xin+ X2= X, the expression (5) takes the form

- F T

or

(Tkr+KX) - TkrT ..

Taking into account T + Tkr= Tnfinally write

(Tkr+KX) 1. (6)

The relation (3) is a common condition for any range of output pressures. Ratio (1), (2) and (6) must be considered when designing, solving the task of expanding the range of output pressures towards lower values.

From the relation (1) implies that if hand> hkrthe first valve is pressed in the initial position with a surplus due to the excessive force of the spring job that regulated the PE the minimum Pn.

From (2) that upon reaching the output and the third cavity pressure Pkra stepped piston having the ability to move without force action sleeve, continues with Fin< F to test this effect, i.e., the force setpoint spring and Rnincreased. The equal sign in this ratio also corresponds to the minimum of Pn.

The expression (4), from which is derived the relation (6) has on the left of the multiplier R. decrease (Pn= Pkr+ P) corresponds to the decrease of the Pnand the sign of equality in relations (4) and (6) meets the minimum Pn.

Thus, smaller values of the expressions (1), (2) and (6) corresponds to the more technical result.

Designing it is advisable to start with assignments efforts on the first valve based on the required effort sealing, possibly taking into account the dynamics, determination of hkrand the choice of F2. Next, taking into account the relations (2), (3) and (6) designate Fin, F.

Itself the minimum value of PN. minis defined as follows.

The minimum possible force Rncompression springs

RN. min= Tkr+ KH.

The gas pressure regulator is schematically shown in the drawing.

The regulator includes a housing 1 with an inlet 2 and outlet 3 cavities, separated by a saddle 4 with the first valve 5, the first sensor element in the form of a stepped piston 6, the smaller the degree of which is connected through a rod 7 with the first valve and forms a greater degree and the housing, the first cavity 8, is connected through a throttle 9 with the atmosphere, a second sensing element in the form of a piston 10, placed in the sleeve 11 forming a second cavity 12 and the spring-loaded 13 jobs. The second cavity 12 is communicated through the saddle 14 and located in the piston 10 of the second valve 15, through the channel 16 in the adapter 17 with the first cavity 8. The sleeve 11 is formed with a greater degree of piston 6 third cavity 18, which through the third valve 19 with the saddle 20 is communicated to the second cavity 12. Channel 21 and the second cavity 12 is in communication with the output cavity 3. Contact the valve 19 with the saddle 20 is made with a guaranteed leak.

Area Finsleeve 11 is shown conventionally. To determine the effective area Finconsider Glca 11 pojate to the piston 6 by the spring 13 job through the piston 10. The first valve 5 is pressed against the seat 4 by the piston 6 via the shaft 7 in the particular case by the value of hkr. The valve 19 is pressed against the seat 20 of the piston 10 and the valve 15 is drawn in to the seat 14 by a spring with a gap X2relatively hard stop in the piston 10. The sleeve 11 has a course of Xinin the direction of the compression spring 13 jobs.

When submitting the environment in the input cavity 2 and the corresponding output resistance line and compressing valve (hkrin output 3, the second 12 and third cavities 18, the pressure begins to increase to a certain critical value of Pkr. At this pressure the piston 6 can blank the first cavity 8 has no impact sleeve 11 to move, additionally pressing the first valve 5. The pressure in the cavities 3, 12 and 18 increases to the required set pressure Pnin which the sleeve 11 and the piston 10 is moved on values of Xinand X2accordingly, and depending on the magnitude of pressure Pnyou can open seat 14 and a filling the first cavity 8.

When the original release of the first valve 5 by the value of hkrwhen expressions (1), (2) and (6) equal to one, and at a minimum Xinand X2the output pressure Pnwill be minimal wolnym due to the reaction on the output pressure of the pistons 6 and 10, possible recharge and operatiunea first cavity 8 and the automatic movement of the first valve 5. Some changes in outlet pressure steady-state process are tracked and the third cavity due to the guaranteed leaks from valve 20 valve 19.

GAS PRESSURE REGULATOR comprising a housing placed between the input and output cavities of the first valve, the first sensor element in the form prescribed in the case of the stepped piston, the smaller the degree of which is connected with the first valve and forms with greater tread and casing a first chamber which is communicated through an orifice to atmosphere, the second sensitive element in the form of a piston, a spring-loaded tasks, and a second chamber which is communicated with the output cavity and through the second valve with the first cavity, and the piston is placed in the sleeve, set in the casing between the piston and the larger step of the stepped piston and provided with a seat of the second valve, which is located in the piston, the second chamber is formed by a piston and sleeve, which made the saddle of the third valve, placed in the sleeve, which forms a greater degree of the stepped piston of the third cavity, and the second is information step of the stepped piston, the third valve is pressed against its seat by the piston, and the third connection of the valve with its seat in the position of their contact is made with guaranteed leak, wherein the design parameters are assigned in accordance with ratios

F / Fin1 ,

where F is the effective area of the stepped piston, perceiving the pressure in the third cavity;

Fin- the effective area of the sleeve

hand/ hkr1 ,

where hand- release of the first valve in the initial position;

hkr- critical (minimum acceptable) release of the first valve, in which the resistance of the output line is set to the critical output pressure Pkrsufficient impact on the area F to maintain the hkr;

(Tkr+ KX) 1,,

where Tn, Tkr- efforts on the first valve respectively supplies a regulated mode, and when the release valve on the value of hkr;

K - spring stiffness job; X is the total spring compression job at moving the sleeve from the position corresponding to hkruntil it stops in the housing and a second sensing element of the stop positions in the sleeve to the position corresponding to the beginning of p the values of the ratios correspond to lower values of the output pressure, and the minimum value of the output pressure PNMPis determined by the formula

Pnmin= (Tkr+ KX) / F2.

 

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