CN211501784U - High-pressure normally-open unloading type pneumatic pressure reducing valve - Google Patents
High-pressure normally-open unloading type pneumatic pressure reducing valve Download PDFInfo
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- CN211501784U CN211501784U CN201921156863.2U CN201921156863U CN211501784U CN 211501784 U CN211501784 U CN 211501784U CN 201921156863 U CN201921156863 U CN 201921156863U CN 211501784 U CN211501784 U CN 211501784U
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Abstract
The utility model belongs to the aircraft design field relates to a pneumatic relief pressure valve of off-load formula is normally opened to high pressure. This pneumatic relief pressure valve of unloading formula is normally opened to high pressure includes: piston assembly, valve body, push rod, valve assembly, the diaphragm that has the pressure sensing characteristic, spring assembly. The utility model discloses the realization is eliminated the influence that the inlet pressure fluctuation changes main valve and outlet pressure.
Description
Technical Field
The utility model belongs to the aircraft design field relates to a pneumatic relief pressure valve of off-load formula is normally opened to high pressure.
Background
The pneumatic pressure reducing valve is one of the auxiliary units of the pneumatic unit combination instrument. The pressure regulator regulates the air source from the air compressor to the required pressure value for pressure stabilization and provides air source for various pneumatic instruments and other pneumatic equipment.
The conventional pressure reducing valve is constructed as shown in fig. 1. The inlet air pressure promotes the valve to be closed, thereby being beneficial to the product to be at highTightness under air pressure. The stress balance of the pressure reducing valve with the structure is close to the following expression as shown in figure 2, and when the product outlet pressure P is higher than the pressure of the product outletGo outAfter the adjustment is conformed, the acting force F of the outlet air pressure on the valveGas outletAnd FMain springClose to constant value, FReset springCan also default to a fixed value, therefore, when the product inlet air pressure P is higher than the normal valueIntoThe higher the force F is applied to the valveAir inletThe larger, thereby resulting in FOutlet gas 1Decrease to make the product outlet PGo outLowering, i.e. when the product inlet pressure rises, and the main spring pressure is not adjusted, will result in a lowering of the product outlet force, but the change in inlet pressure of the conventional pressure reducing valve is greater for the change in outlet pressure, in particular as the shutter closes in advance.
SUMMERY OF THE UTILITY MODEL
The utility model aims at: the influence of the inlet pressure fluctuation change on the main valve and the outlet pressure is eliminated.
The technical scheme is as follows:
the utility model provides a pneumatic relief pressure valve of off-load formula is normally opened to high pressure, include: the valve comprises a piston assembly, a valve body, a push rod, a valve assembly, a diaphragm with pressure sensing characteristics and a spring assembly;
the valve body is of a hollow structure, a piston assembly is fixed at one port, and a spring assembly is fixed at the other port; the inner side wall of the valve body is provided with a valve seat, and the middle of the valve seat is provided with a through hole; the push rod is arranged in the valve body and is matched with the inner side wall of the valve body to reciprocate, one end of the push rod is in contact with the piston assembly through the diaphragm, the piston assembly is sealed by the diaphragm, the other end of the push rod penetrates through the through hole to abut against the valve assembly in the valve body, the valve assembly is under the elasticity of the spring assembly, and the valve assembly is a normally open valve; the hollow cavity of the valve body is divided into an outlet low-pressure cavity with one port and a reset buffer cavity with another port by a valve seat; wherein, the import sets up on the inside wall that the cushion chamber that resets is close to the valve seat, and the export setting is on the inside wall that export low pressure chamber is close to the valve seat.
Further, the pneumatic relief pressure valve of unloading formula is normally opened to high pressure still includes: the air pressure separating body is arranged in the reset buffer cavity;
the guide portion of the shutter assembly is sealed from the pneumatic spacer.
Further, the piston assembly includes: a piston, a piston outer body; the piston outer body is fixed at one port, and the piston reciprocates in the piston shell according to the cavity pressure in the outlet low-pressure cavity.
Further, the piston assembly further comprises: adjusting the spring; the adjusting spring is fixed between the inner bottom surface of the piston outer body and the piston.
Further, the spring assembly includes: the spring comprises a spring, a first spring seat, a second spring seat and a nut;
the nut is fixed at the other port, one end of the spring is fixed on the nut base through the first spring seat, and the other end of the spring is fixed on the valve assembly through the second spring seat.
Further, the pneumatic relief pressure valve of unloading formula is normally opened to high pressure still includes: the safety valve assembly, the safety spring assembly and the small hole are arranged on the base;
the safety valve component is fixed on the inner side wall of the outlet low-pressure cavity through the safety spring component, the small hole is a vent hole formed in the outlet low-pressure cavity, the small hole is blocked by the safety valve component, and the safety valve component is a normally closed valve.
Further, the diaphragm is a metal corrugated diaphragm.
Further, the contact part of the push rod and the valve assembly is quenched.
Furthermore, the sealing area of the outlet low-pressure cavity is consistent with that of the reset buffer cavity.
Further, the sealing diameter between the valve assembly and the valve body is 5 mm; the sealing diameter between the guide part of the valve assembly and the air pressure separator is 5mm, and the sealing areas of the guide part and the air pressure separator are the same.
The utility model has the advantages that:
1. the sealing area of the outlet low-pressure cavity is consistent with that of the reset buffer cavity, so that the impact force of inlet pressure fluctuation change on the main valve is eliminated, and the working cycle times of the main valve are prolonged.
2. The sealing area of the outlet low-pressure cavity is consistent with that of the reset buffer cavity, the influence of the inlet pressure fluctuation change on the outlet pressure is eliminated, and the outlet pressure is not influenced by the inlet pressure change.
3. The influence of the inlet air pressure on the outlet air pressure is eliminated, and the inlet can bear higher working pressure.
4. The outlet low-pressure cavity is communicated with the reset buffer cavity to form a pressure cavity, so that the impact force of outlet pressure change on the pressure sensing diaphragm is weakened, the fatigue damage speed of the diaphragm is slowed down, and the service life of the diaphragm is prolonged.
5. The main valve sealing material is made of polyether-ether-ketone or polyimide with high compression strength, so that the action cycle life of the valve is prolonged.
6. The pressure sensing diaphragm adopts a corrugated diaphragm, so that the stroke and the opening degree of the valve are increased, the outlet flow of a product is increased, and the precision range of pressure regulation of the outlet of the pressure reducing valve is improved.
7. The sealing rubber ring for isolating the high-pressure cavity from the reset cavity adopts an X-shaped rubber ring structure with a check ring, and compared with the traditional O-shaped rubber ring, the pressure of the inlet of the pressure reducing valve can be increased, and the working pressure can be increased from 21MPa to 45 MPa.
Drawings
FIG. 1 is a schematic view of a conventional pressure reducing valve;
FIG. 2 is a schematic diagram of a pressure reducing valve with a conventional pressure reducing valve structure for balancing the pressure;
fig. 3 is a schematic structural view of the high-pressure normally open unloading pneumatic pressure reducing valve provided by the present invention; the automatic valve comprises a piston 1, a piston 2, a first gasket, a pressure regulating spring 3, a jacket nut 4, a valve assembly 5, a piston outer body 6, a nut 7, a second gasket 8, a valve body 9, an inlet nozzle 10, a filter 11, a valve assembly 12, a first protection ring 13, a first sealing ring 14, a pneumatic separation body 15, a spring seat 16, a spring 17, a nut 18, a spring seat 19, a second sealing ring 20, a third sealing ring 21, a second protection ring 22, a fourth sealing ring 23, an outlet nozzle 24, a push rod 24, a diaphragm 25, a safety valve assembly 26, a jacket nut 27, an adjusting nut 28, a third gasket 29 and a safety spring 30;
fig. 4 is a schematic structural view of the high-pressure normally-open unloading pneumatic pressure reducing valve provided by the present invention;
FIG. 5 is a schematic diagram of the force balance of a high-pressure normally-open unloading pneumatic pressure reducing valve.
Detailed Description
The utility model provides an improvement scheme is shown in fig. 3 and 4, for off-load structure relief pressure valve. The stress balance of the product of the scheme is close to the expression shown in figure 5, wherein FReset springConsidered to be constant, when PGo outAfter the adjustment is qualified, FGo outAnd FMain springAlso constant, the elements that affect the equation have no inlet pressure, i.e., a change in inlet pressure does not affect the product outlet pressure.
The utility model provides a pneumatic relief pressure valve of off-load formula is normally opened to high pressure for the aircraft landing brake stage of approach is used for reducing pressure to the device of the pressure that the brake needs with atmospheric system pressure, along with the rising of aircraft air energy system pressure, propose the requirement to pneumatic relief pressure valve high pressure work, inlet pressure rises to 45MPa by 21MPa, traditional pneumatic relief pressure valve inlet pressure is lower relatively, and the range of change is narrower, this kind of novel pneumatic relief pressure valve of off-load formula can realize eliminating the influence that the inlet pressure fluctuation changes main valve and outlet pressure simultaneously.
Specifically, as shown in fig. 3, the pneumatic pressure reducing valve comprises a piston 1, a gasket 2, a pressure regulating spring 3, an outer nut 4, a piston outer body 5, a nut 6, a gasket 7, a valve body 8, a valve assembly 11, a diaphragm 25 and a spring 30, wherein the diaphragm 25 is a metal sheet with corrugations, and is fixed on the valve body 8 through the pressure drop of the gasket 7, the pressure regulating spring 3 acts on the diaphragm 25 with spring elasticity through the piston 1, the diaphragm 25 contacts with a push rod 24, the push rod 24 is pushed to transmit the spring elasticity to the valve assembly 11, and the valve assembly 11 is opened and closed back and forth, so that the function of stabilizing outlet pressure is realized. The contact part of the push rod 24 and the valve assembly 11 is quenched.
Wherein, the sealing diameter between valve assembly 11 and valve body 8 is phi 5mm, the sealing diameter between valve assembly 11 guide part and atmospheric pressure baffle 14 is phi 5mm, both sealing areas are the same, can eliminate structurally the influence of inlet and outlet atmospheric pressure change to reposition of redundant personnel valve atress, thereby eliminate the influence of fluctuation of inlet atmospheric pressure to outlet pressure, can make the product decompression value more stable, reliable, sealing washer 13 adopts the star sealing washer simultaneously, can seal 45MPa pressure, improve inlet pressure application scope.
The first gasket 2 is used for fixing the pressure regulating spring 3 on the inner bottom surface of the piston outer body 5; the outer sleeve nut 4 is used for fixing the piston outer body on the valve body 8; an inlet nozzle 9 is installed at the inlet so as to be externally connected with an upstream pipeline of the cold air control pipeline; the nut 6 and the second washer 7 are used for fixing the diaphragm 25; a filter 10 is mounted between the inlet nipple 9 and the inlet; a first retainer 12 and a first seal ring 13 for sealing the guide portion of the shutter assembly 11 and the pneumatic partition 14; the nut 17 is hermetically arranged at the other end of the valve body 8 through a second sealing ring 19; a third seal ring 20 and a second protective ring 21 seal the valve body 8 with the pneumatic separator 14; an outlet nozzle 23 is installed at the outlet so as to be externally connected with a downstream pipeline of the cold air control pipeline, and a fourth sealing ring 22 seals the valve body 8 and the outlet nozzle 23; the safety spring assembly comprises a safety spring 30, a housing nut 27, an adjustment nut 28 and a third washer 29; one end of the safety spring 30 is fixed on the base of the adjusting nut 28 through a third washer 29, the other end is fixed on the safety valve assembly 26 through a spring seat, the adjusting nut 28 is fixed on the inner side wall of the outlet low-pressure cavity through an outer sleeve nut 27, and the adjusting nut 28 is also used for adjusting the rigidity of the safety spring.
The specific working principle of the high-pressure normally-open unloading type pneumatic reducing valve is as follows:
when the inlet and outlet air pressures are balanced, the pressure regulating spring is in a compressed state, the diaphragm protrudes towards the spring 16, the valve assembly 11 is pushed open by the push rod 24 for a long time, and the valve assembly is in a normally open state.
Then, when the downstream gas pressure of the cold air control pipeline slowly rises, the gas pressure is gathered in the outlet low-pressure cavity, the gas acts on the diaphragm 25 to push the pressure regulating spring 3 to move towards the pressure regulating spring 3, and when the gas pressure of the outlet low-pressure cavity rises to a specified value, the force of the gas pressure acting on the diaphragm 25 completely overcomes the pressure of the pressure regulating spring 3, the valve assembly 11 and the valve seat form a sealing pair, namely the main valve is closed, the inlet gas pressure is cut off, and the outlet pressure is kept stable.
Then, when the air pressure at the outlet is consumed, the air pressure of the low-pressure cavity at the outlet is reduced, the force of the air pressure acting on the diaphragm 25 is smaller than the spring force of the pressure regulating spring 3, the spring force gives a pushing force towards the spring 16 to the diaphragm 25 and the push rod 24, and when the force of the air pressure acting on the diaphragm 25 is smaller than a preset value, the push rod pushes the valve assembly 11 open, and the high air pressure at the inlet enters the low-pressure cavity at the outlet. The product can make the output pressure constant in a certain range by repeating the above actions, thereby realizing the pressure reduction function.
It is worth to be noted that, working air pressure is introduced into an inlet of the high-pressure normally-open unloading type pneumatic pressure reducing valve, when the air pressure of a low-pressure cavity of the outlet is in a specified range, the safety valve component 26 and the small hole form a sealing pair, and the safety valve component 26 keeps a closed state; when the air pressure in the outlet chamber exceeds the specified range, namely the air pressure acting on the safety valve is larger than the spring force of the safety spring 30, the safety valve assembly 26 opens the small hole, the air flows out of the small hole, the air pressure in the outlet low-pressure chamber is reduced to the specified range, the air pressure is prevented from further rising, and products and downstream systems are protected.
Because the high-pressure normally-open unloading type pneumatic pressure reducing valve is sealed by the metal corrugated diaphragm, the lower end of the driving piston 1 is in contact with the metal diaphragm to sense pressure, the diaphragm 25 is fixed on the valve body 8 through the annular groove to realize sealing, when the diaphragm 25 is pushed upwards or downwards in the using process, the jacking pressure on the driving pressure regulating spring 3 and the push rod 24 is transmitted between the driving piston 1 and the push rod 24, the driving spring force transmits the spring force to the sealing surface of the main valve (valve assembly 11) through the diaphragm 25 and the push rod 24, meanwhile, the sealing area of the main valve is consistent with the sealing area of the reset buffer cavity, the impact force of the inlet pressure fluctuation change on the main valve and the influence on the outlet pressure are eliminated, the outlet low-pressure cavity is communicated with the reset buffer cavity, the impact force of the outlet pressure change on the pressure sensing diaphragm is weakened, the fatigue damage speed, the overall service life of the pneumatic pressure reducing valve is prolonged.
Claims (10)
1. A high-pressure normally-open unloading type pneumatic pressure reducing valve is characterized by comprising: the valve comprises a piston assembly, a valve body, a push rod, a valve assembly, a diaphragm with pressure sensing characteristics and a spring assembly;
the valve body is of a hollow structure, a piston assembly is fixed at one port, and a spring assembly is fixed at the other port; the inner side wall of the valve body is provided with a valve seat, and the middle of the valve seat is provided with a through hole; the push rod is arranged in the valve body and is matched with the inner side wall of the valve body to reciprocate, one end of the push rod is in contact with the piston assembly through the diaphragm, the piston assembly is sealed by the diaphragm, the other end of the push rod penetrates through the through hole to abut against the valve assembly in the valve body, the valve assembly is subjected to the elasticity of the spring assembly, the valve assembly and the valve seat sealing pair structure, and the valve assembly is a normally open valve; the hollow cavity of the valve body is divided into an outlet low-pressure cavity with one port and a reset buffer cavity with another port by a valve seat; wherein, the import sets up on the inside wall that the cushion chamber that resets is close to the valve seat, and the export setting is on the inside wall that export low pressure chamber is close to the valve seat.
2. The high-pressure normally-open unloader pneumatic relief valve according to claim 1, further comprising: the air pressure separating body is arranged in the reset buffer cavity;
the guide portion of the shutter assembly is sealed from the pneumatic spacer.
3. The high pressure, normally open, unloading pneumatic relief valve according to claim 1, wherein the piston assembly comprises: a piston, a piston outer body; the piston outer body is fixed at one port, and the piston reciprocates in the piston shell according to the cavity pressure in the outlet low-pressure cavity.
4. The high-pressure normally-open unloading pneumatic pressure reducing valve according to claim 3, wherein the piston assembly further comprises: adjusting the spring; the adjusting spring is fixed between the inner bottom surface of the piston outer body and the piston.
5. The high pressure, normally open, relieved pneumatic pressure relief valve according to claim 1 wherein the spring assembly comprises: the spring comprises a spring, a first spring seat, a second spring seat and a nut;
the nut is fixed at the other port, one end of the spring is fixed on the nut base through the first spring seat, and the other end of the spring is fixed on the valve assembly through the second spring seat.
6. The high-pressure normally-open unloader pneumatic relief valve according to any one of claims 1 to 5, further comprising: the safety valve assembly, the safety spring assembly and the small hole are arranged on the base;
the safety valve component is fixed on the inner side wall of the outlet low-pressure cavity through the safety spring component, the small hole is a vent hole formed in the outlet low-pressure cavity, the small hole is blocked by the safety valve component, and the safety valve component is a normally closed valve.
7. The high-pressure normally-open unloading pneumatic pressure reducing valve according to claim 1, wherein the diaphragm is a metal corrugated diaphragm.
8. The high-pressure normally-open unloading type pneumatic pressure reducing valve according to claim 1, wherein the contact part of the push rod and the valve assembly is subjected to quenching treatment.
9. The high-pressure normally-open unloading pneumatic pressure reducing valve according to claim 1, wherein the sealing area of the outlet low-pressure cavity is consistent with that of the reset buffer cavity.
10. The high-pressure normally-open unloading type pneumatic pressure reducing valve according to claim 1, wherein the sealing diameter between the valve assembly and the valve body is 5 mm; the sealing diameter between the guide part of the valve assembly and the air pressure separator is 5mm, and the sealing areas of the guide part and the air pressure separator are the same.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921156863.2U CN211501784U (en) | 2019-07-22 | 2019-07-22 | High-pressure normally-open unloading type pneumatic pressure reducing valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921156863.2U CN211501784U (en) | 2019-07-22 | 2019-07-22 | High-pressure normally-open unloading type pneumatic pressure reducing valve |
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| CN211501784U true CN211501784U (en) | 2020-09-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201921156863.2U Active CN211501784U (en) | 2019-07-22 | 2019-07-22 | High-pressure normally-open unloading type pneumatic pressure reducing valve |
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| CN (1) | CN211501784U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112128432A (en) * | 2020-10-23 | 2020-12-25 | 重庆磐恒阀门有限公司 | Pressure relief electromagnetic valve for toxic gas pipeline |
| CN112443690A (en) * | 2020-11-13 | 2021-03-05 | 沈阳航天新光集团有限公司 | Pressure reducer of positive unloading type gas path system |
| CN113294560A (en) * | 2021-04-28 | 2021-08-24 | 北京航天发射技术研究所 | High-pressure bidirectional switching electric stop valve |
-
2019
- 2019-07-22 CN CN201921156863.2U patent/CN211501784U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112128432A (en) * | 2020-10-23 | 2020-12-25 | 重庆磐恒阀门有限公司 | Pressure relief electromagnetic valve for toxic gas pipeline |
| CN112443690A (en) * | 2020-11-13 | 2021-03-05 | 沈阳航天新光集团有限公司 | Pressure reducer of positive unloading type gas path system |
| CN113294560A (en) * | 2021-04-28 | 2021-08-24 | 北京航天发射技术研究所 | High-pressure bidirectional switching electric stop valve |
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