High-pressure large-flow primary pressure reducing valve structure and pressure reducing valve

Abstract

The invention provides a high-pressure large-flow primary pressure reducing valve structure and a pressure reducing valve. The high-pressure large-flow primary pressure reducing valve structure comprises a valve seat fixedly arranged in a shell, and the valve seat is located between an inlet high-pressure cavity and an outlet low-pressure cavity; the valve element and the valve seat form a sealing pair and can move in the axial direction to change the opening degree between the valve element and the valve seat, the axial end of the valve element extends into the unloading cavity, the other end of the valve element is connected with an ejector rod, and an unloading hole channel communicated with the outlet low-pressure cavity and the unloading cavity is formed in the valve element. The damping disc is arranged between the outlet low-pressure cavity and the pressure feedback cavity, a damping hole communicated with the outlet low-pressure cavity and the pressure feedback cavity is formed in the damping disc, a piston is arranged in the pressure feedback cavity, and the piston is in matched linkage with the ejector rod. The outlet pressure is led to the unloading cavity through the unloading hole to form force balance, so that the action of the valve core is not influenced by the ultrahigh pressure of the inlet; meanwhile, outlet pressure is slowly guided to the pressure feedback cavity through the damping hole to drive the piston, direct impact of the pressure is avoided, oscillation is effectively restrained, and it is ensured that the outlet pressure is extremely stable.

Description

Technical Field

[0001] This invention relates to the field of fluid pressure control technology, specifically to a high-pressure, high-flow-rate primary pressure reducing valve structure and pressure reducing valve, and more particularly to a primary pressure reducing structure for high-pressure, high-flow-rate gas conditions and a pressure reducing valve including the structure. Background Technology

[0002] Pressure reducing valves are key components in the management of high-pressure air sources in space propulsion systems. Their function is to reduce the pressure of unstable high-pressure intake air and stabilize it at the required lower output pressure. In the field of attitude and orbit control propulsion systems, it is often necessary to handle operating conditions with extremely high inlet pressure (e.g., above 60 MPa) and extremely high flow rates.

[0003] Existing high-pressure pressure reducing valves face several major technical challenges: 1) The extremely high inlet pressure acts on the valve core, generating a huge unbalanced force, which leads to a decrease in regulation sensitivity and requires a huge control force to drive the valve core, making the design of actuators (such as pistons and springs) difficult; 2) Under the impact of high pressure and high flow, the sealing pair between the valve core and the valve seat is prone to failure due to impact, vibration or uneven wear, resulting in leakage; 3) The outlet pressure is prone to fluctuation and oscillation, resulting in poor stability.

[0004] Therefore, there is an urgent need for a pressure-reducing structure that can effectively balance high-pressure loads, ensure sealing reliability, and maintain long-term stable outlet pressure under high-flow conditions. Summary of the Invention

[0005] To address the shortcomings of existing technologies, the purpose of this invention is to provide a high-pressure, high-flow primary pressure reducing valve structure and pressure reducing valve.

[0006] According to the present invention, a high-pressure, high-flow primary pressure reducing valve structure includes a housing, a valve seat, a valve core, and a damping disc. The housing contains, axially, a unloading chamber, an inlet high-pressure chamber, an outlet low-pressure chamber, and a pressure feedback chamber. The valve seat is fixedly disposed within the housing and is located between the inlet high-pressure chamber and the outlet low-pressure chamber. The valve core and the valve seat form a sealing pair and are axially movable to change the opening between them. One axial end of the valve core extends into the unloading chamber, and the other end is connected to a push rod. An unloading channel communicating between the outlet low-pressure chamber and the unloading chamber is provided inside the valve core. The damping disc is disposed between the outlet low-pressure chamber and the pressure feedback chamber, and has a damping hole communicating between them. A piston is disposed within the pressure feedback chamber, and the piston cooperates with the push rod.

[0007] Preferably, the unloading channel includes a valve core unloading hole provided on the valve core and / or a push rod unloading hole provided on the push rod; One end of the valve core unloading hole extends into the unloading chamber, the other end of the valve core unloading hole is connected to the push rod unloading hole, and the push rod unloading hole is connected to the outlet low-pressure chamber.

[0008] Preferably, the part of the valve core that mates with the valve seat is truncated cone-shaped.

[0009] Preferably, it further includes a bushing, which is fixedly installed inside the housing and is located between the valve seat and the unloading chamber; The bushing slides with the valve core and provides axial movement guidance for the valve core.

[0010] Preferably, a second sealing ring is provided between the bushing and the housing to isolate the inlet high-pressure chamber and the unloading chamber.

[0011] Preferably, a third sealing ring is provided between the valve seat and the housing to isolate the inlet high-pressure chamber and the outlet low-pressure chamber.

[0012] Preferably, the valve core is made of metal, the valve seat is made of plastic, and the sealing pair formed by the valve core and the valve seat is a conical sealing pair.

[0013] Preferably, the plastic material is polyimide or polysulfone.

[0014] Preferably, the gas pressure in the unloading chamber acts on one end of the valve core to balance the force exerted by the gas pressure in the outlet low-pressure chamber on the other end of the valve core.

[0015] The pressure reducing valve provided by the present invention adopts a high-pressure, high-flow primary pressure reducing valve structure.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. This invention, through the design of the unloading chamber, significantly offsets the unbalanced force generated by the inlet high pressure on the valve core, making the valve core easy to drive and control, and suitable for ultra-high pressure conditions.

[0017] 2. This invention effectively suppresses pressure fluctuations and system oscillations through the design of a damping disc and a pressure feedback chamber, ensuring stable outlet pressure.

[0018] 3. This invention combines a metal-plastic composite conical sealing pair with a precision guide bushing, which provides good centering, resistance to high-pressure impact, wear resistance, reliable sealing performance, and long service life.

[0019] 4. The balanced design of this invention reduces the requirements for the actuator, enabling the design to achieve valve ports with larger diameters, thereby meeting the application requirements of large flow rates. Attached Figure Description

[0020] Other features, objects, and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings: Figure 1 This is a cross-sectional structural diagram illustrating the main pressure-reducing structure of the present invention; Figure 2 This is a schematic diagram illustrating the gas pressure of the pressure-reducing structure, which is the main feature of this invention.

[0021] The figure shows: 1. Housing; 2. Valve core; 21. Valve core unloading hole; 3. Bushing; 4. Valve seat; 5. Push rod; 51. Push rod unloading hole; 6. Damping disc; 61. Damping hole; 7. Piston; 8. First sealing ring; 9. Second sealing ring; 10. Third sealing ring; A1. Inlet high-pressure chamber; A2. Outlet low-pressure chamber; A3. Pressure feedback chamber; A4. Unloading chamber. Detailed Implementation

[0022] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the invention in any way. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all fall within the protection scope of the present invention.

[0023] like Figure 1 As shown, a high-pressure, high-flow primary pressure reducing valve structure and pressure reducing valve provided by the present invention include a housing 1, a valve seat 4, a valve core 2, and a damping disc 6. The housing 1 has an unloading chamber A4, an inlet high-pressure chamber A1, an outlet low-pressure chamber A2, and a pressure feedback chamber A3 arranged sequentially along the axial direction. The valve seat 4 is fixedly disposed within the housing 1, and is located between the inlet high-pressure chamber A1 and the outlet low-pressure chamber A2. The valve core 2 and the valve seat 4 form a sealing pair and can move axially to change the opening between them. One axial end of the valve core 2 extends into the unloading chamber A4, and the other end of the valve core 2 is connected to a push rod 5. The valve core 2 has an unloading channel connecting the outlet low-pressure chamber A2 and the unloading chamber A4. The damping disc 6 is disposed between the outlet low-pressure chamber A2 and the pressure feedback chamber A3. The damping disc 6 has a damping hole 61 connecting the outlet low-pressure chamber A2 and the pressure feedback chamber A3. A piston 7 is disposed within the pressure feedback chamber A3, and the piston 7 cooperates with the push rod 5 in linkage.

[0024] A key improvement in this application's technical solution lies in the force balance design of the unloading chamber A4: gas from the outlet low-pressure chamber A2 enters the unloading chamber A4 through the unloading channel, filling the unloading chamber A4 with gas at the outlet pressure level. This gas pressure acts on the end of the valve core 2 (or is transmitted through the push rod 5), generating a balancing force that is opposite in direction and similar in magnitude to the force exerted by the pressure from the outlet low-pressure chamber A2 on the other side of the valve core 2. This design ensures that the force state of the valve core 2 is almost unaffected by changes in the inlet high pressure, requiring only a small force (provided by the piston 7) to precisely control the opening of the valve core 2, greatly improving the adjustment sensitivity and reducing the requirements on the actuator.

[0025] Another key improvement in this application's technical solution lies in the damping design of the pressure feedback: the gas from the outlet low-pressure chamber A2 slowly enters the pressure feedback chamber A3 through the tiny damping hole 61 on the damping disk 6, acting on the piston 7. This damping hole 61 effectively prevents the outlet pressure fluctuations from directly and rapidly impacting the piston 7, eliminating potential system oscillations and thus ensuring the ultra-steady characteristics of the outlet pressure.

[0026] Specifically, the unloading channel includes a valve core unloading hole 21 on the valve core 2 and / or a push rod unloading hole 51 on the push rod 5. In one feasible embodiment, one end of the valve core unloading hole 21 extends into the unloading chamber A4, and the other end of the valve core unloading hole 21 communicates with the push rod unloading hole 51, which in turn communicates with the outlet low-pressure chamber A2. The gas pressure in the unloading chamber A4 acts on one end of the valve core 2 to balance the force exerted by the gas pressure in the outlet low-pressure chamber A2 on the other end of the valve core 2.

[0027] More specifically, it also includes a bushing 3, which is fixedly installed inside the housing 1 and located between the valve seat 4 and the unloading chamber A4. The bushing 3 is in sliding fit with the valve core 2 and provides axial movement guidance for the valve core 2. A second sealing ring 9 is provided between the bushing 3 and the housing 1 to isolate the inlet high-pressure chamber A1 from the unloading chamber A4. A third sealing ring 10 is provided between the valve seat 4 and the housing 1 to isolate the inlet high-pressure chamber A1 from the outlet low-pressure chamber A2. A first sealing ring 8 is provided between the bushing 3 and the valve core 2 to isolate the inlet high-pressure chamber A1 from the unloading chamber A4. It should be noted that the first sealing ring 8, the second sealing ring 9, and the third sealing ring 10 in this application's technical solution can all be O-rings.

[0028] More specifically, the valve core 2 is made of metal, and the valve seat 4 is made of plastic. The mating part of the valve core 2 and the valve seat 4 is truncated cone-shaped, and the sealing pair formed by the valve core 2 and the valve seat 4 is a conical sealing pair. Through the design of the conical sealing pair, the opening between the valve core 2 and the valve seat 4 is changed when the valve core 2 moves axially, thereby regulating the flow rate of fluid entering the outlet low-pressure chamber A2 from the inlet high-pressure chamber A1. In a preferred embodiment, the diameter of the valve core 2 and the through diameter of the valve seat 4 are designed to be the same size. The plastic material is polyimide or polysulfone. The valve core 2 is made of metal, and the valve seat 4 is made of plastic (such as polyimide or polysulfone), forming a conical seal with good centering. The metal valve seat 4 provides structural strength and impact resistance, while the plastic valve seat 4 can produce slight deformation to achieve a tighter soft seal. The combination of the two can withstand high-pressure impacts of over 60 MPa and ensure sealing reliability under high flow conditions. Bushing 3 provides precise guidance for valve core 2, ensuring the alignment of valve core 2 and valve seat 4, and further extending the service life of the sealing pair.

[0029] Further, in a preferred embodiment, high-pressure gas enters from the inlet high-pressure chamber A1. The valve core 2 is axially movable under the precise guidance of the bushing 3. When the valve core 2 moves to the left against the spring force (not shown in the figure, typically acting on the back of the piston 7), the conical sealing opening formed by it and the valve seat 4 increases, and the gas flow, after being depressurized through the throttling orifice, enters the outlet low-pressure chamber A2. The gas in the outlet low-pressure chamber A2 is divided into two paths: the first path slowly enters the pressure feedback chamber A3 through the tiny damping hole 61 on the damping disc 6. The pressure in the pressure feedback chamber A3 acts on the piston 7, and the displacement of the piston 7 is fed back to the push rod 5 and the valve core 2 through a mechanical connection, forming a closed-loop control. The throttling effect of the damping hole 61 filters out pressure fluctuations, preventing system oscillation. The second path enters the unloading chamber A4 through the unloading hole on the push rod 5 and the unloading hole on the valve core 2. The pressure in the unloading chamber A4 (approximately equal to the outlet pressure) acts on the right end face of the valve core 2, generating a rightward force. This force balances the leftward force exerted by the pressure in the outlet low-pressure chamber A2 on the conical surface of the valve core 2. The second sealing ring 9 isolates the inlet high-pressure chamber A1 from the unloading chamber A4 and the outlet low-pressure chamber A2, while the third sealing ring 10 achieves a static seal between the valve seat 4 and the housing 1. When the outlet pressure attempts to decrease due to increased flow demand, the pressure in the pressure feedback chamber A3 decreases accordingly. The piston 7 moves to the left under the action of the spring, pushing the push rod 5 and the valve core 2 to the left, increasing the valve opening and allowing more high-pressure gas to flow in, thereby compensating for and stabilizing the outlet pressure. The entire process is extremely smooth and precise due to the force balance and damping design.

[0030] According to the present invention, a pressure reducing valve adopts the above-mentioned high-pressure, high-flow primary pressure reducing valve structure.

[0031] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0032] Specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention. Unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.

Claims

1. A high-pressure, high-flow primary pressure reducing valve structure, characterized in that, The device includes a housing (1), a valve seat (4), a valve core (2), and a damping disc (6). The housing (1) is provided with an unloading chamber (A4), an inlet high-pressure chamber (A1), an outlet low-pressure chamber (A2), and a pressure feedback chamber (A3) arranged sequentially along the axial direction. The valve seat (4) is fixedly installed inside the housing (1) and is located between the inlet high-pressure chamber (A1) and the outlet low-pressure chamber (A2). The valve core (2) and the valve seat (4) form a sealing pair and can move axially to change the opening between them. One end of the valve core (2) extends into the unloading chamber (A4) axially, and the other end of the valve core (2) is connected to a push rod (5). The valve core (2) is provided with an unloading channel that connects the outlet low-pressure chamber (A2) and the unloading chamber (A4). The damping disk (6) is disposed between the outlet low-pressure chamber (A2) and the pressure feedback chamber (A3). The damping disk (6) is provided with a damping hole (61) connecting the outlet low-pressure chamber (A2) and the pressure feedback chamber (A3). A piston (7) is disposed in the pressure feedback chamber (A3). The piston (7) is engaged in linkage with the push rod (5).

2. The high-pressure, high-flow primary pressure reducing valve structure as described in claim 1, characterized in that, The unloading passage includes a valve core unloading hole (21) provided on the valve core (2) and / or a top rod unloading hole (51) provided on the top rod (5). One end of the valve core unloading hole (21) extends to the unloading chamber (A4), and the other end of the valve core unloading hole (21) is connected to the push rod unloading hole (51), which is connected to the outlet low-pressure chamber (A2).

3. The high-pressure, high-flow primary pressure reducing valve structure as described in claim 1, characterized in that, The valve core (2) and the valve seat (4) are in the shape of a frustum.

4. The high-pressure, high-flow primary pressure reducing valve structure as described in claim 1, characterized in that, It also includes a bushing (3), which is fixedly installed inside the housing (1) and is located between the valve seat (4) and the unloading chamber (A4); The bushing (3) slides with the valve core (2) and provides axial movement guidance for the valve core (2).

5. The high-pressure, high-flow primary pressure reducing valve structure as described in claim 4, characterized in that, A second sealing ring (9) is provided between the bushing (3) and the housing (1) to isolate the inlet high pressure chamber (A1) and the unloading chamber (A4).

6. The high-pressure, high-flow primary pressure reducing valve structure as described in claim 1, characterized in that, A third sealing ring (10) is provided between the valve seat (4) and the housing (1) to isolate the inlet high pressure chamber (A1) and the outlet low pressure chamber (A2).

7. The high-pressure, high-flow primary pressure reducing valve structure as described in claim 1, characterized in that, The valve core (2) is made of metal, the valve seat (4) is made of plastic, and the sealing pair formed by the valve core (2) and the valve seat (4) is a conical sealing pair.

8. The high-pressure, high-flow primary pressure reducing valve structure as described in claim 7, characterized in that, The plastic material is polyimide or polysulfone.

9. The high-pressure, high-flow primary pressure reducing valve structure as described in claim 1, characterized in that, The gas pressure in the unloading chamber (A4) acts on one end of the valve core (2) to balance the force exerted by the gas pressure in the outlet low-pressure chamber (A2) on the other end of the valve core (2).

10. A pressure reducing valve, characterized in that, The high-pressure, high-flow primary pressure reducing valve structure described in any one of claims 1 to 9 is adopted.

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