CN111043369A

CN111043369A - Pressure reducing regulating valve with inlet variable flow limiting buffer

Info

Publication number: CN111043369A
Application number: CN201911174977.4A
Authority: CN
Inventors: 董万峰; 李小明; 曾维亮; 谭屏; 王兴录
Original assignee: Xian Aerospace Propulsion Institute
Current assignee: Xian Aerospace Propulsion Institute
Priority date: 2019-11-26
Filing date: 2019-11-26
Publication date: 2020-04-21
Anticipated expiration: 2039-11-26
Also published as: CN111043369B

Abstract

The invention provides a pressure reducing regulating valve with a variable flow limiting buffer at an inlet, which aims to solve the technical problem that a pressure reducing regulating valve outlet has larger instantaneous overshoot when the gas pressure is quickly loaded at the inlet of the pressure reducing regulating valve in the prior art.

Description

Pressure reducing regulating valve with inlet variable flow limiting buffer

Technical Field

The invention relates to a pressure reduction regulating valve with a variable flow limiting buffer at an inlet, which has a high inlet pressure application range and is suitable for various aerospace propulsion systems such as rocket ship constant-pressure boosting conveying, blowing gas distribution and the like.

Background

The pressure reducing regulating valve has the functions of reducing the pressure of high-pressure gas in the gas cylinder and maintaining relatively stable outlet pressure under the conditions of inlet pressure change and outlet flow change, and is commonly used for aerospace propulsion systems. The existing pressure reducing regulating valve has the advantages that when gas pressure is quickly loaded at the inlet of the pressure reducing regulating valve, the outlet of the pressure reducing regulating valve is subjected to large instantaneous overshoot, and the quick stability of a regulating system is not utilized.

Disclosure of Invention

The invention provides a pressure reducing regulating valve with a variable flow limiting buffer at an inlet, which has the advantage of no overshoot during starting, and aims to solve the technical problem that the outlet of the pressure reducing regulating valve has larger instantaneous overshoot when the gas pressure of the conventional pressure reducing regulating valve is quickly loaded at the inlet of the pressure reducing regulating valve.

The technical scheme of the invention is as follows:

a pressure reduction regulating valve with an inlet with variable flow-limiting buffering function comprises a valve body, an inlet connecting pipe nozzle, an unloading assembly, a main valve core, a return spring, a sensitive piston, a main spring, a first spring gland and a valve seat;

it is characterized in that:

the buffer flow-limiting component is arranged in the inlet filler neck; the buffer flow limiting assembly comprises a buffer valve core and a buffer spring, wherein the buffer spring is positioned closer to the inlet end of the inlet filler pipe nozzle;

a sealing ring A and a sealing ring B are also arranged between the buffer valve core and the inlet filler neck, and the position of the sealing ring A is close to the buffer spring;

the sealing area of the sealing ring B is larger than that of the sealing ring A, and the sealing area difference of the sealing ring B and the sealing ring A meets the following requirements: the lowest inlet working pressure of the valve multiplied by the sealing area difference is larger than the elasticity of the buffer spring;

a plurality of inclined through holes are formed in the side wall of the buffer valve core, and the total equivalent diameter of the through holes is larger than the diameter of the flow channel of the valve body; the outlet end of the buffer valve core is provided with a restricted orifice with the diameter of 0.2-0.5 mm.

Furthermore, a plurality of through-flow holes are uniformly distributed along the same circumference.

Further, the unloading assembly is arranged in the valve body; the bottom of the unloading component is provided with an annular mounting groove consisting of an inner mounting groove and an outer mounting groove; the main valve core is arranged in the inner mounting groove and can move relatively along the axial direction of the unloading component; the reset spring is arranged in the outer mounting groove; the reset spring is arranged in the outer mounting groove, one end of the reset spring is contacted with the bottom of the outer mounting groove, and the other end of the reset spring is contacted with the radial outward extension part of the main valve core; the main valve core, the conical surface on the valve body and the unloading assembly form an unloading type throttling sealing pair structure.

Further, the main spring is arranged on the valve seat and is pressed and limited through a first spring gland; the first spring gland is sleeved outside the sensitive piston, the bottom of the first spring gland is contacted with the bottom of the sensitive piston, and the flanging of the first spring gland is contacted with the upper end of the main spring.

Furthermore, a lubricating sheet is arranged between the lower end of the main spring and the valve seat, and the lubricating sheet is a steel sheet with a smooth surface.

Further, a spring housing is provided between the side wall of the main spring and the side wall of the valve seat.

Further, the lower part of the main valve core is provided with a first plastic ring which is matched with the valve body to realize sealing.

Furthermore, the first plastic ring is in conical surface fit with the valve body.

Compared with the prior art, the invention has the following beneficial effects:

1. the buffer flow-limiting component is arranged in the inlet pipe connecting nozzle of the conventional pressure-reducing regulating valve, works only in the high-pressure quick loading starting process, is in a fully-opened state when the pressure-reducing regulating valve works stably, has no additional flow resistance, and has strong structural popularization expansibility.

2. The main valve core adopts a plastic valve seat pressing structure and a conical surface sealing structure, so that the sealing reliability is high, and the production and processing technology is improved; compared with the traditional sealed nonmetal cold or hot pressing, bonding or edge rolling locking structure, the thread pressing assembly is adopted to realize sealing, so that the production links of sealed parts are reduced, the production difficulty is reduced, and the sealing property is improved.

Drawings

Fig. 1 is a schematic structural view of an embodiment of a pressure reducing regulator valve according to the present invention.

Fig. 2 is a schematic structural diagram of a variable current limiting buffer assembly according to an embodiment of the present invention.

Fig. 3 is a schematic structural diagram of a safety pressure relief assembly according to an embodiment of the invention.

The reference numbers illustrate:

1-valve body, 2-main valve core, 21-first plastic ring, 3-buffer valve core, 31-through hole, 32-restricted hole, 4-sensitive piston, 41-pressure relief through hole, 5-safety pressure relief valve core, 51-second plastic ring, 6-adjusting limit screw, 7-main spring, 8-buffer spring, 9-reset spring, 10-unloading component, 11-spring jacket, 12-lock nut, 13-second spring gland, 14-sealing ring A, 15-sealing ring B, 16-inlet nozzle, 17-pressure relief spring, 18-lubricating sheet, 19-first spring gland and 20-valve seat.

Detailed Description

As shown in figure 1, the pressure reducing regulating valve comprises a valve body 1, an inlet filler neck 16, a buffering and flow limiting assembly, an unloading assembly 10, a main valve core 2, a return spring 9, a sensitive piston 4, a safety pressure relief device, a regulating limit screw 6, a main spring 7, a spring outer sleeve 11 and a locking nut 12.

An inlet filler neck 16 is arranged at the medium inlet upstream of the valve body 1 and is connected to the valve body 1.

As shown in FIG. 2, a cushion and flow restriction assembly is disposed within the inlet filler neck 16 and includes a cushion spool 3 and a cushion spring 8, wherein the cushion spring 8 is positioned closer to an inlet end of the inlet filler neck 16; a sealing ring A14 and a sealing ring B15 are further arranged between the buffer valve core 3 and the inlet filler neck 16, the position of the sealing ring A14 is close to the buffer spring 8, and the position of the sealing ring B15 is close to the valve body 1.

The sealing area of the sealing ring B15 is larger than that of the sealing ring A14, and the difference of the sealing areas of the sealing ring B15 and the sealing ring A14 is satisfied: the difference of the lowest inlet working pressure of the valve multiplied by the sealing area is larger than the elastic force of the buffer spring 8, so that the buffer valve core 3 can maintain an opening state in the steady-state working process.

A plurality of inclined through holes 31 are formed in the side wall of the buffer valve core 3, and the total equivalent diameter of the through holes 31 is larger than the diameter of the flow channel of the valve body 1, so that the medium flow flowing into the downstream in a stable working state is ensured; the outlet end of the buffer valve core 3 (namely the end part of the buffer valve core 3 close to the valve body 1) is provided with a flow limiting hole 32 with the diameter of 0.2-0.5mm, and the rising slope of the medium pressure at the outlet of the buffer valve core 3 can be accurately controlled by adjusting the diameter D of the flow limiting hole 32, so that the stable rising is realized, and the inlet working medium slowly flows into the downstream of the valve body 1. The flow-restricting orifice 32 is arranged in an expanding configuration after passing through the throat, so that the flow-restricting effect is high in consistency.

In the initial state, the buffer spring 8 attaches the buffer valve core 3 to the valve body 1 and maintains the attachment state in the initial loading process; during steady state operation, the medium pressure acts on the unbalanced area formed by the seal ring a 14 and the seal ring B15, ensuring that the damper spool 3 can maintain an open state during steady state operation.

The unloading assembly 10 is arranged in the valve body 1; the bottom of the unloading assembly 10 is provided with an annular mounting groove consisting of an inner mounting groove and an outer mounting groove; the main valve core 2 is arranged in the inner mounting groove and can move relatively along the axial direction of the unloading component 10; a first plastic ring 21 is arranged at the position where the main valve core 2 is contacted with the conical surface of the valve body 1, and the outer side wall of the first plastic ring 21 is matched with the conical surface on the valve body 1; the return spring 9 is arranged in the outer mounting groove; the reset spring 9 is arranged in the outer mounting groove, one end of the reset spring 9 is contacted with the bottom of the outer mounting groove, and the other end of the reset spring 9 is contacted with the radial outward extension part of the main valve element 2; the main valve core 2 adopts thread spinning, and forms an unloading throttling sealing pair structure with a conical surface on the valve body 1 and an unloading assembly 10, thereby ensuring reliable sealing under the action of a return spring 9.

The sensitive piston 4 is of a hollow structure, one end of the sensitive piston is open, and the other end of the sensitive piston is closed; the middle part of the closed end of the sensitive piston 4 is provided with a pressure relief through hole 41.

As shown in fig. 3, the safety pressure relief device comprises a safety pressure relief assembly arranged inside the sensitive piston 4 and an adjusting limit screw 6 arranged on the valve seat 20 and corresponding to the position of the safety pressure relief assembly; the safety pressure relief assembly comprises a second spring gland 13, a pressure relief spring 17 and a safety pressure relief valve core 5 which are sequentially arranged from top to bottom; the upper end of the second spring gland 13 is contacted with the main valve element 2, and a cavity of the second spring gland 13 contains and can compress a pressure relief spring 17; the upper part of the safety pressure relief valve core 5 is contacted with a pressure relief spring 17, and the lower part of the safety pressure relief valve core passes through a pressure relief through hole 41 at the closed end of the sensitive piston 4; the safety pressure relief valve core 5 can synchronously move with the sensitive piston 4 within a certain stroke; a conical surface is arranged at the matching position of the upper part of the inner side wall of the pressure relief through hole 41 at the closed end of the sensitive piston 4 and the safety pressure relief valve core 5, and a second plastic ring 51 with the outer side wall matched with the conical surface of the inner side wall of the pressure relief through hole 41 is arranged at the lower part of the safety pressure relief valve core 5; when the pressure reducing regulating valve works normally, the safety pressure relief valve core 5 is pressed at the conical surface of the pressure relief through hole 41 by the pressure relief spring 17, and the second plastic ring 51 on the safety pressure relief valve core 5 can form effective sealing with the conical surface at the pressure relief through hole 41. The gap H between the adjusting limiting screw 6 and the safety pressure relief valve core 5 is adjusted to control so that the pressure relief and the working pressure can be well matched, and the debugging process is simple.

The main spring 7 is arranged on the valve seat 20 and is pressed and limited by the first spring gland 19; the first spring gland 19 is sleeved outside the sensitive piston 4, the bottom of the first spring gland 19 is contacted with the bottom of the sensitive piston 4, and a flanging of the first spring gland 19 is contacted with the upper end of the main spring 7; a lubricating sheet 18 is arranged between the lower end of the main spring 7 and the valve seat 20, and the lubricating sheet 18 is a steel sheet with a smooth surface and is used for reducing the abrasion of the end part of the main spring 7; a spring jacket 11 is provided between the side wall of the main spring 7 and the side wall of the valve seat 20 for adjusting the initial installation height of the main spring 7 to ensure a nominal outlet pressure.

The locking nut 12 is arranged outside the spring housing 11 and between the valve body 1 and the valve seat 20, and is used for ensuring that the installation height of the main spring 7 is not changed in the processes of transportation, turnover, flight and the like. The embodiment of the invention can realize stable rise of outlet pressure without overshoot during quick loading, and has the following specific principles:

when the high-pressure gas pressure is quickly loaded at the inlet of the pressure-reducing regulating valve, the gas can only flow out through the preset restricted flow hole 32, the pressure at the outlet of the pressure-reducing regulating valve is slowly built, the pressure stably rises without overshoot, and meanwhile, the pressure in the inner cavity at the right side of the buffer valve core 3 also rises synchronously. When the pressure of the inner cavity at the right side of the buffer valve core 3 is increased to a certain value, the buffer valve core 3 overcomes the elastic force of the buffer spring 8 and the friction force between the buffer valve core 3 and the inner wall of the inlet filler neck 6 under the action of the medium pressure in the cavity, and the buffer valve core 3 starts to move towards the opening direction of the inlet of the pressure reduction regulating valve. After the buffer valve core 3 moves to the inlet of the pressure reducing regulating valve and is completely opened, the buffer valve core 3 is not throttled, gas is supplied to a back path through the buffer valve core 3 under zero pressure difference, and then the buffer valve core 3 is always in a fully opened state under the action of medium force. The initial flow limiting hole 32 and the delayed opening process of the buffer valve core 3 reduce the impact of the high-pressure gas pressure quick loading on the starting process of the reducing valve, so that the reducing valve works relatively stably.

The embodiment of the invention can also realize safe pressure relief, and the specific principle is as follows:

according to the invention, the safety pressure relief valve core 5 is arranged in the sensitive piston 4, and when the pressure relief regulating valve works normally, plastic on the safety pressure relief valve core 5 and the conical surface on the pressure relief through hole 41 at the closed end of the sensitive piston 4 form effective sealing. When the pressure at the outlet of the pressure reducing regulating valve rises abnormally, the sensitive piston 4 overcomes the elasticity of the main spring 7 to move downwards, the safety pressure relief valve core 5 cannot move downwards continuously under the limiting action of the regulating limiting screw 6, the sealing part of the safety pressure relief valve core 5 and the sensitive piston 4 is opened, and leakage occurs, so that the purpose of accurate pressure relief is achieved. When the pressure of the air is reduced, the sensitive piston 4 moves upwards under the action of the elasticity of the main spring 7, and the safety pressure relief valve core 5 and the sensitive piston 4 form sealing again. The opening of the safety pressure relief valve core 5 and the outlet working pressure of the pressure reduction regulating valve can be accurately matched by screwing and adjusting the relative position of the limiting screw 6.

Claims

1. A pressure reduction regulating valve with an inlet with variable flow limiting buffering comprises a valve body (1), an inlet connecting pipe nozzle (16), an unloading assembly (10), a main valve core (2), a return spring (9), a sensitive piston (4), a main spring (7), a first spring gland (19) and a valve seat (20);

the method is characterized in that:

also includes a buffer flow-limiting assembly disposed within the inlet filler neck (16); the buffer flow limiting assembly comprises a buffer valve core (3) and a buffer spring (8), wherein the buffer spring (8) is positioned closer to the inlet end of the inlet filler pipe nozzle (16);

a sealing ring A (14) and a sealing ring B (15) are also arranged between the buffer valve core (3) and the inlet filler neck (16), and the position of the sealing ring A (14) is close to the buffer spring (8);

the sealing area of the sealing ring B (15) is larger than that of the sealing ring A (14), and the sealing area difference of the sealing ring B and the sealing ring A satisfies the following conditions: the lowest inlet working pressure of the valve multiplied by the sealing area difference is larger than the elastic force of the buffer spring (8);

a plurality of inclined through holes (31) are formed in the side wall of the buffer valve core (3), and the total equivalent diameter of the through holes (31) is larger than the diameter of a flow passage of the valve body (1); the outlet end of the buffer valve core (3) is provided with a restricted orifice (32) with the diameter of 0.2-0.5 mm.

2. The inlet variable flow restriction buffered pressure relief regulator valve of claim 1, further comprising: the through flow holes (31) are uniformly distributed along the same circumference.

3. The inlet variable flow restriction buffered pressure relief regulator valve of claim 2, wherein:

the unloading assembly (10) is arranged in the valve body (1); the bottom of the unloading component (10) is provided with an annular mounting groove consisting of an inner mounting groove and an outer mounting groove; the main valve core (2) is arranged in the inner mounting groove and can move relatively along the axial direction of the unloading assembly (10); the return spring (9) is arranged in the outer mounting groove; the reset spring (9) is arranged in the outer mounting groove, one end of the reset spring (9) is in contact with the bottom of the outer mounting groove, and the other end of the reset spring (9) is in contact with the radial extending part of the main valve core (2);

the main valve core (2), the conical surface on the valve body (1) and the unloading assembly (10) form an unloading throttling sealing pair structure.

4. The inlet variable flow restriction buffered pressure relief regulator valve of claim 3, wherein:

the main spring (7) is arranged on the valve seat (20) and is pressed and limited by a first spring gland (19); the first spring gland (19) is sleeved outside the sensitive piston (4), the bottom of the first spring gland (19) is in contact with the bottom of the sensitive piston (4), and a flanging of the first spring gland (19) is in contact with the upper end of the main spring (7).

5. The inlet variable flow restriction buffered pressure relief regulator valve of claim 4, wherein:

a lubricating sheet (18) is arranged between the lower end of the main spring (7) and the valve seat (20), and the lubricating sheet (18) is a steel sheet with a smooth surface.

6. The inlet variable flow restriction buffered pressure relief regulator valve of claim 5, wherein:

a spring jacket (11) is arranged between the side wall of the main spring (7) and the side wall of the valve seat (20).

7. The inlet variable flow restriction buffered pressure relief regulator valve of claim 6, wherein: the lower part of the main valve core (2) is provided with a first plastic ring (21) which is matched with the valve body (1) to realize sealing.

8. The inlet variable flow restriction buffered pressure relief regulator valve of claim 7, wherein: the first plastic ring (21) is in conical surface fit with the valve body (1).