Pressure boosting check valve for gas pressure boosting system and gas pressure boosting system

Abstract

The present invention provides a boost check valve for a gas boost system and a gas boost system, wherein a valve core is arranged at the air inlet position of a valve housing, a first sealing structure is arranged on the valve housing, and a second sealing structure is arranged on the valve core; when the valve core is closed, the first sealing structure and the second sealing structure are in close contact; when the valve core is opened, a fluid channel is formed between the first sealing structure and the second sealing structure, and the fluid channel includes a fluid expansion channel. The present invention forms a multi-stage expansion structure through a gas expansion channel, and when the gas flows from the sealing structure into the valve housing through the gas expansion channel, the flow channel area of ​​the gas flow in the gas expansion channel gradually increases, and the gas flow rate increases, forming a reaction force on the valve core, promoting the valve to open, and avoiding high-frequency flutter in the one-way valve.

Description

Technical Field

[0001] The present invention relates to the technical field of fluid working systems, and in particular to a boosting check valve for a gas boosting system and a gas boosting system, and in particular to a launch vehicle boosting check valve with a flutter suppression structure. Background Art

[0002] The boost check valve is an important component of the boost delivery system of a launch vehicle, and is mainly used to deliver boost gas from the ground to the rocket. After the high-pressure gas is connected to the upstream, the valve core opens unilaterally under the action of air pressure and spring, the valve is turned on, and the high-pressure gas flows through the valve into the boost gas cylinder for storage. After the boost is completed, the check valve automatically closes and remains sealed under the action of the inlet and outlet pressure difference and the spring. The boost check valve is usually composed of a shell, sealing material, valve core, spring, etc. However, under certain working conditions, such as when the valve opening is small, high-frequency flutter will occur in the check valve, that is, the valve core reciprocates at high speed, causing wear on the guide surface, heat and stagnation, seal failure, and even vibration impact loads, threatening the safety of the rocket boost system.

[0003] The reasons for the flutter of the check valve are as follows: During the operation of the boost check valve, under certain parameter conditions, the high-pressure airflow pushes the valve core to a certain opening, and the gas flows through the valve core into the downstream area. The conduction of the valve affects the local pressure field in the inlet area of ​​the pressure reducing valve, causing the local pressure to decrease, and on the other hand, it also increases the downstream gas pressure. When the conditions are right, the decrease in the upstream local pressure and the increase in the downstream pressure cause the valve core to have insufficient driving force to open, resulting in a decrease in the valve core opening or even closure. Subsequently, the upstream air pressure increases, and the valve core opens again, and this repeats to form flutter. When the check valve flutter occurs, the average opening of the valve core is generally small.

[0004] At present, the flutter suppression structures for rocket booster check valves mainly include: a. adding a valve core bushing, such as the document "Research on Anti-Flutter Technology of Launch Vehicle Gas Check Valve"; b. increasing dry friction damping by means of spring coils, expansion rings, O-rings, etc., or using damping holes to increase the pressure difference before and after the valve, such as the patent document with publication number CN108180297A; c. using a non-balanced action area to achieve anti-vibration and vibration suppression effects, such as the patent document with publication number CN115289253A.

[0005] However, the above-mentioned method of increasing dry friction still has problems. For example, after the valve core has moved multiple times, the damping effect of friction parts such as the bushing is significantly reduced, and the damping is insufficient under high-speed motion conditions. The one-way valve with an unbalanced effective area has a complex structure and greatly increases the manufacturing cost. Summary of the invention

[0006] In view of the defects in the prior art, an object of the present invention is to provide a boosting check valve for a gas boosting system and a gas boosting system.

[0007] A boosting check valve for a gas boosting system according to the present invention comprises: a valve housing and a valve core, wherein the valve core is arranged in the valve housing;

[0008] The valve core is arranged at the air inlet position of the valve housing, a first sealing structure is arranged on the valve housing, and a second sealing structure is arranged on the valve core;

[0009] When the valve core is closed, the first sealing structure and the second sealing structure are in close contact; when the valve core is opened, a fluid channel is formed between the first sealing structure and the second sealing structure, and the fluid channel includes a fluid expansion channel;

[0010] The fluid flow direction in the fluid expansion channel is a first direction; the first direction is opposite to the movement direction of the valve core when it is opened; and the flow channel cross-sectional area of ​​the fluid expansion channel gradually increases along the first direction.

[0011] Preferably, in the fluid expansion channel, the fluid expands and the flow rate increases, generating a reaction force on the valve core in a direction opposite to the flow direction.

[0012] Preferably, the first sealing structure includes a plurality of first sealing pairs, and the second sealing structure includes a plurality of second sealing pairs;

[0013] A plurality of the first sealing pairs and a plurality of the second sealing pairs are arranged alternately;

[0014] When the valve core is opened, a fluid delivery channel and a fluid expansion channel are alternately formed between the plurality of the first sealing pairs and the plurality of the second sealing pairs;

[0015] The fluid inflow direction in the fluid delivery channel is a second direction, and the second direction is the same as the moving direction of the valve core when it is opened.

[0016] Preferably, the second sealing pair is provided with an inclined surface inclined along the first direction, and the fluid expansion channel is formed between the inclined surface and the first sealing pair.

[0017] Preferably, a valve sleeve is provided in the valve housing, and one end of the valve core is located in the valve sleeve;

[0018] A valve sleeve cavity is formed between the valve core and the valve sleeve. An elastic member is arranged in the valve sleeve cavity. The elastic member is connected to the valve core and is used for resetting the valve core.

[0019] Preferably, a reaction force isolation structure is provided on the valve sleeve near the air outlet of the valve housing;

[0020] The reaction force isolation structure is arranged corresponding to the air outlet of the valve housing, and the reaction force isolation structure is located between the air outlet of the valve housing and the valve core.

[0021] Preferably, an exhaust hole is provided on the side wall of the valve sleeve, and the exhaust hole is communicated with the valve sleeve cavity.

[0022] Preferably, the valve sleeve is provided with a valve sleeve air inlet hole, and the valve core is provided with a valve core air inlet hole;

[0023] When the valve core is opened, the valve core air inlet hole is communicated with the valve sleeve air inlet hole through the fluid channel.

[0024] Preferably, the valve sleeve is provided with a valve sleeve air outlet hole, and the valve sleeve air outlet hole is communicated with the valve sleeve air inlet hole;

[0025] The valve sleeve air outlet hole is communicated with the valve housing air outlet through an air outlet cavity, and the air outlet cavity is provided with a cavity air outlet hole communicated with the valve sleeve air outlet hole.

[0026] The present invention also provides a gas boosting system, comprising the above-mentioned boosting one-way valve for the gas boosting system.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] 1. The present invention forms a gas expansion channel between the first sealing structure and the second sealing structure to form a multi-stage expansion structure. When the gas flows from the sealing structure into the valve housing through the gas expansion channel, the flow area of ​​the gas flow in the gas expansion channel gradually increases, and the gas flow rate increases, thereby forming a reaction force on the valve core, promoting the opening of the valve, and avoiding high-frequency flutter in the one-way valve.

[0029] 2. The present invention adds an airflow reaction force isolation structure at the outlet of the one-way valve to eliminate the reaction force of the gas on the valve core during the process of reducing pressure and increasing speed at the outlet of the one-way valve, thereby preventing the reaction force of the gas from directly acting on the surface of the valve core and hindering the opening of the valve core, further promoting the opening of the valve, and avoiding high-frequency flutter in the one-way valve.

[0030] 3. The present invention sets up a multi-stage expansion structure and a reaction force isolation structure, which increases the combined force that promotes the opening of the valve core when the valve is working, promotes the valve core to open quickly, and crosses the small opening range that is prone to flutter, thereby achieving vibration suppression and vibration prevention effects, improving the stability of the one-way valve, and ensuring the safety of the rocket booster delivery system. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings:

[0032] Figure 1 It is a cross-sectional schematic diagram of a boost check valve used in a gas boost system;

[0033] Figure 2 A schematic structural diagram to highlight the first sealing structure and the second sealing structure;

[0034] Figure 3 for Figure 2 A partial enlarged schematic diagram of .

[0035] The figure shows:

[0036] DETAILED DESCRIPTION

[0037] The present invention is described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those of ordinary skill in the art, several changes and improvements can also be made without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0038] Embodiment 1:

[0039] like Figures 1 to 3 As shown, this embodiment provides a boost check valve for a gas boost system, comprising: a valve housing 1 and a valve core 2, the valve core 2 is arranged in the valve housing 1; the valve core 2 is arranged at the air inlet position of the valve housing 1, the valve housing 1 is provided with a first sealing structure 101, and the valve core 2 is provided with a second sealing structure 201; a valve sleeve 4 is arranged in the valve housing 1, and one end of the valve core 2 is located in the valve sleeve 4; a valve sleeve cavity 9 is formed between the valve core 2 and the valve sleeve 4, and an elastic member 5 is arranged in the valve sleeve cavity 9, and the elastic member 5 is connected to the valve core 2, and the elastic member 5 is used for resetting the valve core 2. The elastic member 5 is a spring. As shown in FIG. Figure 1 As shown, A is the air inlet of the valve housing 1, and B is the air outlet of the valve housing 1.

[0040] The valve sleeve 4 is provided with a valve sleeve air inlet hole 401, and the valve core 2 is provided with a valve core air inlet hole 202; when the valve core 2 is opened, the valve core air inlet hole 202 is connected with the valve sleeve air inlet hole 401 through the fluid channel 3. The valve sleeve 4 is provided with a valve sleeve air outlet hole 402, and the valve sleeve air outlet hole 402 is connected with the valve sleeve air inlet hole 401; the valve sleeve air outlet hole 402 is connected with the air outlet of the valve housing 1 through the air outlet cavity 8, and the air outlet cavity 8 is provided with a cavity air outlet hole 801 connected with the valve sleeve air outlet hole 402.

[0041] When the valve core 2 is closed, the first sealing structure 101 and the second sealing structure 201 are in close contact; when the valve core 2 is opened, a fluid channel 3 is formed between the first sealing structure 101 and the second sealing structure 201, and the fluid channel 3 includes a fluid expansion channel 301; the fluid flow direction in the fluid expansion channel 301 is a first direction; the first direction is opposite to the movement direction when the valve core 2 is opened; the flow channel cross-sectional area of ​​the fluid expansion channel 301 gradually increases along the first direction. In the fluid expansion channel 301, the fluid expands, the flow velocity increases, and a reaction force is generated on the valve core 2 in the direction opposite to the flow direction.

[0042] The first sealing structure 101 includes a plurality of first sealing pairs 1011, and the second sealing structure 201 includes a plurality of second sealing pairs 2011; the plurality of first sealing pairs 1011 and the plurality of second sealing pairs 2011 are arranged alternately; when the valve core 2 is opened, the plurality of first sealing pairs 1011 and the plurality of second sealing pairs 2011 alternately form a fluid delivery channel 302 and a fluid expansion channel 301; the fluid inflow direction in the fluid delivery channel 302 is a second direction, and the second direction is the same as the moving direction when the valve core 2 is opened. The second sealing pair 2011 is provided with an inclined surface 2012 inclined along the first direction, and a fluid expansion channel 301 is formed between the inclined surface 2012 and the first sealing pair 1011.

[0043] A reaction force isolation structure 7 is provided on the valve sleeve 4 near the air outlet of the valve housing 1; the reaction force isolation structure 7 is provided corresponding to the air outlet of the valve housing 1, and the reaction force isolation structure 7 is located between the air outlet of the valve housing 1 and the valve core 2. An exhaust hole 6 is provided on the side wall of the valve sleeve 4, and the exhaust hole 6 is connected to the valve sleeve cavity 9.

[0044] This embodiment also provides a gas pressurization system, including the above-mentioned pressurization check valve for gas pressurization system. This valve is used in rocket inert gas pressurization system, such as Long March series launch vehicles. When the rocket is parked on the ground, the high-pressure gas source replenishes compressed helium to the rocket high-pressure gas cylinder through the pressurization check valve. After the replenishment is completed, the check valve automatically closes to achieve sealing and prevent helium leakage.

[0045] In this embodiment, a multi-stage expansion structure is formed by multiple fluid expansion channels 301. In the multi-stage expansion structure, when the high-pressure gas flows in the fluid expansion channel 301, the flow channel cross-section increases, the gas expands rapidly here, and the air flow speed increases significantly. According to the fluid momentum theorem, at this time, the air flow will form a rightward reaction force on the second sealing structure 201 and the valve core 2 during the process of increasing speed, such as Figure 1As shown. At the outlet of the one-way valve, an airflow reaction force isolation structure 7 is set, which is fixed on the valve sleeve 4 by threaded connection or welding. The airflow at the outlet of the one-way valve changes from the original radial flow to axial flow, and the flow channel area increases, the airflow expands, and the gas flow rate increases. According to the fluid momentum theorem, the gas must generate a leftward reaction force, such as Figure 1 As shown. When the reaction force isolation structure 7 is not provided on the one-way valve sleeve, the reaction force of the gas directly acts on the surface of the valve core 2, hindering the opening of the valve core 2. When the reaction force isolation structure 7 is provided, the gas reaction force is transmitted to the valve housing 1 by the valve sleeve 4, and no leftward force is formed on the valve core 2. Through the above-mentioned arrangement, the rightward combined force on the valve core 2 is increased when the valve is working, which promotes the rapid opening of the valve core 2 and crosses the small opening range that is prone to flutter. Thereby achieving the effects of vibration suppression and vibration prevention, improving the stability of the one-way valve, and ensuring the safety of the rocket booster delivery system.

[0046] Embodiment 2:

[0047] Those skilled in the art may understand this embodiment as a more specific description of Embodiment 1.

[0048] This embodiment provides a rocket boost check valve with a flutter suppression structure, which belongs to the field of general fluid working systems, is a fluid pressure actuator, and relates to a power valve of a launch vehicle boost delivery system.

[0049] like Figures 1 to 3 As shown, a rocket boost check valve flutter suppression structure provided in this embodiment includes a valve housing 1, a valve core 2, a first sealing structure 101, a second sealing structure 201, a valve sleeve 4, an elastic member 5, a reaction force isolation structure 7 and an exhaust hole 6. The first sealing structure 101 and the second sealing structure 201 constitute a sealing structure.

[0050] A valve core 2, a sealing structure, a valve sleeve 4, and an elastic member 5 are arranged in the valve housing 1. A first sealing structure 101 is arranged on the valve housing 1, and a second sealing structure 201 is arranged at one end of the valve core 2. The first sealing structure 101 and the second sealing structure 201 form a fluid channel 3. The fluid channel 3 includes a plurality of fluid expansion channels 301 and a plurality of fluid delivery channels 302. The plurality of fluid expansion channels 301 constitute a multi-stage expansion structure. For the multi-stage expansion structure, when the airflow flows into the fluid expansion channel 301, the cross-sectional area of ​​the flow channel gradually increases, and the cross-sectional area of ​​the flow channel of the airflow in the fluid delivery channel 302 remains unchanged.

[0051] The side wall of the valve sleeve 4 is provided with an exhaust hole 6. The valve sleeve 4 is provided with an airflow reaction force isolation structure 7, and the reaction force isolation structure 7 and the valve sleeve 4 are fixedly connected by threaded connection or welding, and the two are relatively fixed.

[0052] The sealing structure adopts a multi-stage expansion structure. In the fluid expansion channel 301, the airflow channel area increases, the gas flow rate increases, and a reaction force on the valve core 2 is formed to promote the opening of the valve core 2. At the outlet of the one-way valve, an airflow reaction force isolation structure 7 is added to eliminate the reaction force of the gas on the valve core 2 during the process of reducing pressure and increasing speed at the outlet of the one-way valve. When the one-way valve is working, the above structure can increase the comprehensive thrust of the gas pushing the valve core 2, promote the opening of the valve core 2, and make it move in the direction of a large opening, avoiding the valve core staying at a small opening position, thereby avoiding the generation of valve flutter and improving the reliability of the valve.

[0053] Working principle:

[0054] In this embodiment, a multi-stage expansion structure is formed by a plurality of fluid expansion channels 301 , and the fluid force of the high-pressure gas on the valve core 2 is increased by utilizing the rapid expansion and speed increase when the high-pressure gas leaves the sealing structure.

[0055] At the outlet of the one-way valve, an airflow reaction force isolation structure 7 is provided, which is fixed to the valve sleeve 4 by threaded connection or welding. At the outlet of the one-way valve, the airflow changes from the original radial flow to the axial flow, and the flow channel area increases, the airflow expands, and the gas flow rate increases. Figure 1 As shown, according to the fluid momentum theorem, the gas will inevitably generate a leftward force. When the reaction force isolation structure 7 is not set on the one-way valve sleeve 4, the reaction force of the gas directly acts on the right side surface of the valve core 2, preventing the valve core from opening to the right. After the reaction force isolation structure 7 is set, the gas reaction force is transmitted to the valve housing 1 by the reaction force isolation structure 7 and the valve sleeve 4, and will not form a leftward force on the valve core 2. Through the above-mentioned arrangement, the rightward combined force on the valve core 2 when the valve is working is increased, which promotes the rapid opening of the valve core 2 and crosses the small opening range that is prone to flutter. At the same time, an exhaust hole 6 is set on the valve sleeve 4 to avoid the increase in air pressure caused by the compression of the right side space when the valve core 2 opens to the right. Finally, the vibration suppression and vibration prevention effects are achieved, the stability of the one-way valve is improved, and the safety of the rocket booster delivery system is guaranteed.

[0056] The present invention forms a multi-stage expansion structure through a gas expansion channel. When the gas flows from the sealing structure into the valve housing through the gas expansion channel, the flow area of ​​the gas flow in the gas expansion channel gradually increases, and the gas flow rate increases, thereby forming a reaction force on the valve core, promoting the opening of the valve, and avoiding high-frequency flutter in the one-way valve.

[0057] In the description of the present application, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0058] The above describes the specific embodiments of the present invention. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art can make various changes or modifications within the scope of the claims, which does not affect the essence of the present invention. In the absence of conflict, the embodiments of the present application and the features in the embodiments can be combined with each other arbitrarily.

Claims

1. A boost check valve for a gas boost system, characterized in that: include: A valve housing (1) and a valve core (2), wherein the valve core (2) is arranged in the valve housing (1); The valve core (2) is arranged at the air inlet position of the valve housing (1), the valve housing (1) is provided with a first sealing structure (101), and the valve core (2) is provided with a second sealing structure (201); When the valve core (2) is closed, the first sealing structure (101) and the second sealing structure (201) are in close contact; when the valve core (2) is opened, a fluid channel (3) is formed between the first sealing structure (101) and the second sealing structure (201), and the fluid channel (3) includes a fluid expansion channel (301); The direction of fluid flow in the fluid expansion channel (301) is a first direction; the first direction is opposite to the direction of movement of the valve core (2) when it is opened; the flow channel cross-sectional area of ​​the fluid expansion channel (301) gradually increases along the first direction; The first sealing structure (101) comprises a plurality of first sealing pairs (1011), and the second sealing structure (201) comprises a plurality of second sealing pairs (2011); A plurality of the first sealing pairs (1011) and a plurality of the second sealing pairs (2011) are arranged alternately; When the valve core (2) is opened, the plurality of first sealing pairs (1011) and the plurality of second sealing pairs (2011) alternately form fluid delivery channels (302) and fluid expansion channels (301); The direction of fluid flow into the fluid delivery channel (302) is a second direction, and the second direction is the same as the moving direction of the valve core (2) when it is opened; The second sealing pair (2011) is provided with an inclined surface (2012) inclined along the first direction, and the fluid expansion channel (301) is formed between the inclined surface (2012) and the first sealing pair (1011).

2. The boost check valve for a gas boost system according to claim 1, characterized in that: In the fluid expansion channel (301), the fluid expands and the flow rate increases, generating a reaction force on the valve core (2) in a direction opposite to the flow direction.

3. The boost check valve for a gas boost system according to claim 1, characterized in that: A valve sleeve (4) is arranged in the valve housing (1), and one end of the valve core (2) is located in the valve sleeve (4); A valve sleeve cavity (9) is formed between the valve core (2) and the valve sleeve (4), an elastic member (5) is arranged in the valve sleeve cavity (9), the elastic member (5) is connected to the valve core (2), and the elastic member (5) is used to reset the valve core (2).

4. The boost check valve for a gas boost system according to claim 3, characterized in that: A reaction force isolation structure (7) is provided on the valve sleeve (4) near the air outlet of the valve housing (1); The reaction force isolation structure (7) is arranged corresponding to the air outlet of the valve housing (1), and the reaction force isolation structure (7) is located between the air outlet of the valve housing (1) and the valve core (2).

5. The boost check valve for a gas boost system according to claim 3, characterized in that: An exhaust hole (6) is provided on the side wall of the valve sleeve (4), and the exhaust hole (6) is in communication with the valve sleeve cavity (9).

6. The boost check valve for a gas boost system according to claim 3, characterized in that: The valve sleeve (4) is provided with a valve sleeve air inlet hole (401), and the valve core (2) is provided with a valve core air inlet hole (202); When the valve core (2) is opened, the valve core air inlet hole (202) is connected to the valve sleeve air inlet hole (401) through the fluid channel (3).

7. The boost check valve for a gas boost system according to claim 6, characterized in that: The valve sleeve (4) is provided with a valve sleeve air outlet hole (402), and the valve sleeve air outlet hole (402) is communicated with the valve sleeve air inlet hole (401); The valve sleeve air outlet hole (402) is connected to the air outlet of the valve housing (1) through the air outlet cavity (8), and the air outlet cavity (8) is provided with a cavity air outlet hole (801) connected to the valve sleeve air outlet hole (402).

8. A gas pressurization system, characterized in that: A boosting one-way valve for a gas boosting system comprising any one of claims 1 to 7.

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