Miniature one-way throttle valve

Abstract

The utility model discloses a miniature one-way throttle valve which mainly solves the problems that an existing one-way throttle valve is large in weight, large in size and high in failure rate. The one-way throttle valve comprises a shell, an expansion cavity, a throttle cavity and a feedback cavity which are arranged in the shell and are continuously communicated, and a one-way control mechanism arranged in the feedback cavity. The valve can provide constant flow under the condition that the pressure difference between the two ends of the valve is greatly changed, and is suitable for actuator cylinder speed control under the action of variable loads. Meanwhile, the constant flow valve is not limited by the structure, the space and the layout of a space station, and constant flow can be provided under the condition that the pressure difference between the two ends of the valve is greatly changed. Therefore, compared with the prior art, the device is suitable for popularization and application.

Description

Technical Field

[0001] The utility model relates to the technical field of aerospace control, in particular to a miniature one-way throttle valve. Background Art

[0002] Check valves and throttle valves are two types of valve products widely used in the aerospace field. They are widely used in aircraft landing gear systems, control systems, satellite control propulsion systems and attitude control engines of solid and liquid rockets.

[0003] The one-way valve is an important liquid / gas regulating device used to prevent the reverse flow of oil in hydraulic systems or to prevent the reverse flow of compressed air in pneumatic systems. It has three main working states, namely:

[0004] 1. Closed state: When the one-way valve is fully closed, the fluid is blocked on both sides of the valve, forming a static isolation area. This makes it impossible for the fluid to flow between the upstream and downstream of the valve.

[0005] 2. Open state: When the fluid flows from the downstream to the upstream of the one-way valve, the one-way valve will automatically open due to the pressure difference of the fluid. At this time, the valve core is pressurized and pushed away from the valve seat, allowing the fluid to pass.

[0006] 3. Backflow state: When the fluid flows from the upstream to the downstream of the one-way valve, the valve core will automatically close due to the pressure difference of the fluid. At this time, the valve core is affected by the upstream pressure, pressing the valve seat tightly together to prevent the fluid from flowing back.

[0007] In short, the working principle of the one-way valve mainly depends on the pressure difference of the fluid. When the fluid flows from the downstream of the one-way valve to the upstream, due to the pressure difference, the valve core will be automatically pushed open to allow the fluid to pass.

[0008] A throttle valve is a valve that controls the flow of a fluid by changing the throttling section or throttling length. The working principle of a throttle valve is to change the cross-sectional area of ​​the flow channel so that the fluid encounters a certain resistance when passing through, thereby reducing the flow velocity and flow rate of the fluid and achieving flow control.

[0009] In a normal hydraulic / pneumatic system, a one-way valve often exists independently of a throttle valve, resulting in more internal interfaces in the system, heavier weight, larger volume, and higher failure rate. Therefore, it is desired to have a technical solution to overcome or at least alleviate at least one of the above-mentioned defects of the prior art. Utility Model Content

[0010] The utility model aims to provide a miniature one-way throttle valve, which mainly solves the problems of the existing one-way throttle valve being heavy, large in size and having a high failure rate.

[0011] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0012] A miniature one-way throttle valve comprises a housing, an expansion chamber, a throttling chamber and a feedback chamber which are arranged in the housing and are continuously connected, and a one-way control mechanism arranged in the feedback chamber;

[0013] The one-way control mechanism includes a one-way valve support installed in a feedback chamber, a liquid channel formed between the inner diameter of the feedback chamber and the outer wall of the one-way valve support, a one-way valve outlet cavity opened at the end of the one-way valve support along the liquid outlet direction, a spring mounting cavity opened in the one-way valve support, a liquid inlet opened on the one-way valve support and communicating with the spring mounting cavity, a liquid outlet opened on the one-way valve support and communicating with the liquid channel and the one-way valve outlet cavity, an adjusting spring with one end pressed against the bottom of the spring mounting cavity, a steel ball support with one end pressed against one end of the adjusting spring facing the throttling cavity, and a steel ball installed between the steel ball support and the throttling cavity; the steel ball is pre-pressed at the outlet of the throttling cavity by the adjusting spring.

[0014] Furthermore, in the utility model, throttling holes are provided at both ends of the throttling cavity, and a filter screen is welded in the throttling cavity; one end of the steel ball abuts against the outer side of the throttling hole along one side of the liquid outlet direction.

[0015] Furthermore, in the utility model, a plug is provided in the expansion cavity; the inner diameters of the expansion cavity and the plug are both processed with internal threads.

[0016] Furthermore, in the utility model, a sealing cone surface matching the steel ball is processed on the side of the throttle hole facing the steel ball.

[0017] Furthermore, in the present invention, the shell is cylindrical.

[0018] Compared with the prior art, the utility model has the following beneficial effects:

[0019] (1) The novel device can be used in the aerospace field to adjust the working speed of an actuator of a certain system and the working consistency between different actuators.

[0020] (2) This new type of valve is not restricted by the structure, space and layout of the space station and can provide a constant flow rate even when the pressure difference between the two ends of the valve varies greatly.

[0021] (3) The new type used in this application is a miniature one-way throttle valve, which integrates the two functions of a one-way valve and a throttle valve and is easy to disassemble and assemble.

[0022] (4) The new type used in this application is a miniature high-sensitivity one-way throttle valve, with a total weight of only 2.7g, which is 1 / 20 of the products on the market that only have a pressure regulation function. Its volume is equivalent to that of a soybean, which is 1 / 10 of the products on the market that only have a pressure regulation function. Its throttling flow resistance tolerance accuracy is as high as ±5%. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the cross-sectional structure of the utility model (check valve closed).

[0024] Figure 2 It is a schematic diagram of the cross-sectional structure of the utility model (one-way valve is opened).

[0025] Figure 3 It is a three-dimensional exploded schematic diagram of the structure of the utility model.

[0026] Figure 4 It is a schematic diagram of the three-dimensional structure of the filter screen of the utility model.

[0027] The names corresponding to the reference numerals are:

[0028] 1-shell, 2-expansion chamber, 3-throttling chamber, 4-feedback chamber, 5-check valve support, 6-liquid channel, 7-check valve outlet chamber, 8-spring installation chamber, 9-liquid inlet, 10-liquid outlet, 11-adjusting spring, 12-steel ball support, 13-steel ball, 14-throttling hole, 15-filter, 16-plug. DETAILED DESCRIPTION

[0029] The present invention is further described below in conjunction with the accompanying drawings and embodiments. The present invention includes but is not limited to the following embodiments.

[0030] like Figure 3 As shown, the utility model discloses a miniature one-way throttle valve, comprising a housing 1, an expansion chamber 2, a throttling chamber 3 and a feedback chamber 4 which are arranged in the housing 1 and are continuously connected, and a one-way control mechanism arranged in the feedback chamber 4. The housing 1 is cylindrical with a diameter of Ø4.75mm, a length of 20.1mm, an inner diameter of Ø3.6mm, and a height of 10mm. The inner diameter of the expansion chamber 2 is Ø3.50mm, and the depth is 5.30mm. A filter screen 15 is welded between the expansion chamber 2 and the throttling chamber 3 to integrate them together; the inner diameter of the throttling chamber 3 is Ø3.0mm, and the depth is 3.4mm; the inner diameter of the feedback chamber 4 is Ø3.60mm, and the length is 9mm.

[0031] In this embodiment, the one-way control mechanism includes a one-way valve support 5 installed in the feedback chamber 4, a liquid channel 6 formed between the inner diameter of the feedback chamber 4 and the outer wall of the one-way valve support 5, a one-way valve outlet chamber 7 opened at the end of the one-way valve support 5 along the liquid outlet direction, a spring mounting chamber 8 opened in the one-way valve support 5, a liquid inlet 9 opened on the one-way valve support 5 and communicating with the spring mounting chamber 8, a liquid outlet 10 opened on the one-way valve support 5 and communicating with the liquid channel 6 and the one-way valve outlet chamber 7, an adjusting spring 11 with one end pressed against the bottom of the spring mounting chamber 8, a steel ball support 12 with one end pressed against one end of the adjusting spring 11 facing the throttling chamber 3, and a steel ball 13 installed between the steel ball support 12 and the throttling chamber 3; the steel ball 13 is pre-pressed at the outlet of the throttling chamber 3 by the adjusting spring 11. Among them, the one-way valve support 5 is inserted into the housing 1 through an assembly hole with a diameter of Ø3.0mm, and the end is rolled and locked; the stiffness of the adjusting spring 11 is 0.3N / mm, the free height is 5.5mm, and the preload is 1mm; the steel ball 13 and the steel ball support 12 are preloaded on the conical surface of the oil outlet of the throttling chamber 3 through the adjusting spring 11.

[0032] In this embodiment, throttling holes 14 are provided at both ends of the throttling chamber 3, and a filter screen 15 is welded in the throttling chamber 3 by laser welding; one end of the steel ball 13 is against the outer side of the throttling hole 14 along the liquid outlet direction. The inner diameter of the oil outlet is Ø1.2mm and the sealing cone surface is finely processed. Figure 4 As shown, the installation interface size of the filter 15 is Ø3.0 mm, the filtering diameter of the filter is Ø0.1 mm, and the throttling hole diameter is Ø0.3 mm.

[0033] In this embodiment, a plug 16 is provided in the expansion chamber 2; the expansion chamber 2 and the plug 16 are both processed with internal threads. The housing is inserted into the installation hole with a specified installation accuracy by means of insertion, and the expansion section is pushed into the plug 16, so that the entire valve body is reliably fastened in the installation hole. The expansion chamber 2 and the plug 16 of the housing 1 are processed with internal threads, and the special tooling is screwed in when disassembling, and pulled out in sequence.

[0034] The working principle of the micro one-way throttle valve in this embodiment is as follows:

[0035] 1. Closed state: When the one-way valve is fully closed, the fluid is blocked on both sides of the valve, forming a static isolation area. This prevents the fluid from flowing between the upstream and downstream of the valve. At this time, the steel ball 13 is Figure 1 In the position shown, under the action of the adjusting spring 11 and the steel ball support 12, the steel ball 13 and the outlet of the throttle hole 14 seal the oil through the conical surface seal.

[0036] 2. Opening state: When the fluid flows from the downstream of the one-way valve to the upstream, the one-way valve will automatically open due to the pressure difference of the fluid. At this time, the steel ball 13 is pressurized and pushed away from the outlet of the throttle hole 14. At this time, the steel ball 13 is Figure 2 In the position shown, when the pressure difference between the oil inlet and the oil outlet reaches the design value, the liquid inlet 9 is connected with the throttle hole 14, and the fluid enters the liquid channel 6 through the liquid inlet 9, and from the liquid channel 6 to the one-way valve outlet cavity 7 through the liquid outlet 10, so that the one-way valve allows the fluid to pass until a new throttling state is reached, and the pressure difference change of the throttle hole is sensed by the preset spring stiffness to perform pressure compensation.

[0037] 3. Backflow state: When the fluid flows from the upstream to the downstream of the one-way valve, the steel ball 13 will automatically close due to the pressure difference of the fluid. At this time, the steel ball 13 is pressed tightly together by the upstream pressure to prevent the fluid from flowing back.

[0038] Through the above design, the utility model is used to adjust the working speed of a certain system actuator and the working consistency between different actuators. At the same time, the utility model is not limited by the structure, space and layout of the space station, and can provide a constant flow rate when the pressure difference between the two ends of the valve varies greatly.

[0039] The above embodiment is only one of the preferred implementation modes of the present utility model and should not be used to limit the protection scope of the present utility model. Any changes or modifications that are made to the main design concept and spirit of the present utility model without any substantive significance, as long as the technical problems solved are still consistent with the present utility model, should be included in the protection scope of the present utility model.

Claims

1. A miniature one-way throttle valve, characterized in that: It comprises a housing (1), an expansion chamber (2), a throttling chamber (3) and a feedback chamber (4) which are arranged in the housing (1) and are continuously connected, and a one-way control mechanism arranged in the feedback chamber (4); The one-way control mechanism comprises a one-way valve support (5) installed in the feedback chamber (4), a liquid passage (6) formed between the inner diameter of the feedback chamber (4) and the outer wall of the one-way valve support (5), a one-way valve outlet cavity (7) provided at the end of the one-way valve support (5) along the liquid outlet direction, a spring installation cavity (8) provided in the one-way valve support (5), a liquid inlet (9) provided on the one-way valve support (5) and communicating with the spring installation cavity (8), and a one-way valve outlet cavity (7) provided at the end of the one-way valve support (5) along the liquid outlet direction. 5) and connected with the liquid channel (6) and the one-way valve outlet chamber (7), one end of which presses against the adjusting spring (11) at the bottom of the spring installation chamber (8), one end of which presses against the steel ball support (12) at the end of the adjusting spring (11) facing the throttling chamber (3), and a steel ball (13) installed between the steel ball support (12) and the throttling chamber (3); the steel ball (13) is pre-pressed at the outlet of the throttling chamber (3) by the adjusting spring (11).

2. A micro one-way throttle valve according to claim 1, characterized in that: Throttling holes (14) are provided at both ends of the throttling chamber (3), and a filter screen (15) is welded inside the throttling chamber (3); one end of the steel ball (13) abuts against the outside of the throttling hole (14) on one side along the liquid outlet direction.

3. A micro one-way throttle valve according to claim 2, characterized in that: A plug (16) is provided in the expansion chamber (2); the inner diameters of the expansion chamber (2) and the plug (16) are both machined with internal threads.

4. A micro one-way throttle valve according to claim 3, characterized in that: A sealing conical surface adapted to the steel ball (13) is machined on the side of the throttling hole (14) facing the steel ball (13).

5. A micro one-way throttle valve according to claim 4, characterized in that: The shell (1) is cylindrical.

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