Ultra-light low-flow-resistance one-way valve

Abstract

The ultra-light low-flow-resistance one-way valve comprises a shell, a piston, a spring and a spring seat, the shell is of a tubular structure, a conical surface structure is arranged on the inner wall of the shell, the piston is located in the shell and can slide, one end of the piston is open, the other end of the piston is closed, and the spring is arranged on the shell. The closed end of the piston makes contact with the conical surface structure in the shell, a through hole communicated with the open end of the piston is formed in the side edge of the piston, the open end of the piston is connected with one end of the spring seat through the spring, and the spring seat is fixedly connected with the inner wall of the shell. According to the utility model, the weight and the size are reduced by at least one order of magnitude through the structural design, the product structure is simple and reliable, and the plug-in mounting is adopted, so that redundant pipelines and pipe joints required by similar products during mounting are avoided, and the mounting space is greatly reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of one-way valves, in particular to an ultra-light and low-flow-resistance one-way valve. Background Art

[0002] The one-way valve is a valve product widely used in the aerospace field. It is widely used in aircraft landing gear systems, control systems, satellite control propulsion systems, and attitude control engines of solid and liquid rockets. When the hydraulic oil flows from the downstream of the one-way valve to the upstream, due to the pressure difference of the fluid, the piston is compressed and pushed away from the sealing cone surface, allowing the fluid to pass through, and the one-way valve will automatically open. When the hydraulic pressure flows from the upstream of the one-way valve to the downstream, due to the pressure difference of the fluid, the piston is affected by the upstream pressure and will be tightly pressed on the sealing cone surface, preventing the fluid from flowing back, and the one-way valve is closed.

[0003] In a normal hydraulic / pneumatic system, a one-way valve is often an independent component, and is heavy and large in size. In addition, a conventional one-way valve is often sealed by a steel ball and a sealing ring, which is prone to aging and failure and has a high failure rate. Therefore, a technical solution is desired to overcome or at least alleviate at least one of the above-mentioned defects of the prior art. Summary of the invention

[0004] The utility model aims to provide an ultra-light low flow resistance one-way valve.

[0005] In order to achieve the above-mentioned purpose, the utility model is implemented according to the following technical scheme:

[0006] The utility model comprises a shell, a piston, a spring and a spring seat. The shell is a tubular structure. The inner wall of the shell is provided with a conical surface structure. The piston is located in the shell and can slide. One end of the piston is open and the other end is closed. The closed end of the piston contacts the conical surface structure in the shell. The side of the piston is provided with a through hole communicated with the open end of the piston. The open end of the piston is connected to one end of the spring seat through the spring, and the spring seat is fixedly connected to the inner wall of the shell.

[0007] Preferably, the closed end of the piston is a spherical structure, and the conical structure of the housing matches the spherical structure of the piston.

[0008] Preferably, the outer wall of the piston is connected to the inner wall of the housing by a clearance fit.

[0009] As an improvement, a plug is detachably connected to one end of the shell, the middle of the plug has a through hole, the outer wall of the plug is a conical structure, and the inner wall of the shell connecting the plug is a conical structure.

[0010] The beneficial effects of the utility model are:

[0011] The utility model is an ultra-light, low-flow-resistance one-way valve. Compared with the prior art, the utility model reduces weight and size by at least one order of magnitude through structural design, and the product structure is simple and reliable. It adopts plug-in installation, avoiding the redundant pipelines and pipe joints required for similar products during installation, and greatly reducing the installation space. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a cross-sectional view of the forward flow section of the utility model;

[0013] Figure 2 It is a cross-sectional view of the reverse flow type of the utility model;

[0014] Figure 3 This is a schematic diagram of the fluid direction of the forward flow type of the utility model;

[0015] Figure 4 This is a schematic diagram of the reverse flow direction of the fluid of the utility model;

[0016] Figure 5 It is a schematic diagram of the external structure of the utility model.

[0017] In the figure: housing 1, piston 2, spring 3, spring seat 4, plug 5. DETAILED DESCRIPTION

[0018] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. The schematic embodiments and descriptions of the present invention are used to explain the present invention but are not intended to limit the present invention.

[0019] like Figure 1-5 As shown: the utility model includes a shell 1, a piston 2, a spring 3, and a spring seat 4. The shell 1 is a tubular structure. The inner wall of the shell 1 is provided with a conical surface structure. The piston 2 is located in the shell 1 and can slide. One end of the piston 2 is open and the other end is closed. The closed end of the piston 2 contacts the conical surface structure in the shell 1. The side of the piston 2 is provided with a through hole communicating with the open end of the piston 2. The open end of the piston 2 is connected to one end of the spring seat 4 through the spring 3, and the spring seat 4 is fixedly connected to the inner wall of the shell 1.

[0020] Preferably, the closed end of the piston 2 is a spherical structure, and the conical structure of the housing 1 matches the spherical structure of the piston 2 .

[0021] Preferably, the outer wall of the piston 2 and the inner wall of the housing 1 are connected by a clearance fit.

[0022] As an improvement, a plug 5 is detachably connected to one end of the shell 1, the plug 5 has a through hole in the middle, the outer wall of the plug 5 is a conical structure, and the inner wall connecting the shell 1 and the plug 5 is a conical structure.

[0023] The working principle of the utility model is as follows:

[0024] 1. In closed state: When the ultra-light low flow resistance one-way valve is fully closed, the hydraulic oil is blocked on both sides of the piston 2, forming a static isolation area. This prevents the hydraulic oil from flowing between the upstream and downstream of the piston 2. At this time, the piston 2 is Figure 1 and 2 In the position shown, the piston 2 and the housing 1 seal the hydraulic oil through the conical seal under the action of the spring 3 and the spring seat 4.

[0025] 2. In the open state: When the fluid flows from the downstream of the ultra-light low-resistance one-way valve to the upstream, due to the pressure difference of the fluid, the piston 2 is in Figure 3 , 4 In the position shown, the piston is pressurized and pushed away from the sealing cone surface, allowing hydraulic oil to pass through, and the ultra-light low flow resistance one-way valve is in the open state.

[0026] 3. Backflow state: When the hydraulic oil flows from the upstream to the downstream of the ultra-light low-resistance one-way valve, the piston 2 will automatically close due to the pressure difference of the fluid. At this time, the piston 2 is pressed tightly against the sealing cone surface of the housing 1 by the upstream pressure to prevent the hydraulic oil from flowing back.

[0027] In the utility model, the shell 1 is designed with a 60° sealing cone surface, including a forward flow model and a reverse flow model. The reverse flow model has an M2.5 internal thread processed inside, which is convenient for disassembly and assembly of the product using tooling. The piston 2 is assembled with the internal oil hole of the shell 1. The end of the piston 2 is a spherical surface processed with high precision, which forms a reliable line contact seal with the 60° cone surface of the internal oil hole of the shell 1. At the same time, the outer diameter of the piston 2 and the inner diameter of the shell 1 are clearance-matched, and the piston 2 can reliably move in the flow channel of the shell 1. The spring seat 4 is installed in the inner hole of the shell 1. The inner hole of the spring seat of the forward flow model is an M2.5 internal thread, which is convenient for disassembly and assembly using tooling; the shell 1 and the spring seat 4 are connected by pulse laser welding to ensure that they will not loosen or fall off during long-term use.

[0028] When the utility model is installed, when one end of the housing 1 is connected to the mounting hole of the equipment, it is fixed by the plug 5. The plug 5 and the housing 1 are interference fit. When the plug 5 is pressed into the housing 1, the housing 1 will expand outward, so that the outer diameter of the mounting hole increases by about 0.08mm, so as to ensure that the entire product is reliably clamped in the equipment mounting hole. The inner hole of the plug 5 is an M3 internal thread, which is convenient for using special tooling to remove the entire product from the mounting hole. The spring 3 is installed between the piston 2 and the spring seat 4 to provide a pre-tightening force for the sealing fit between the piston 2 and the housing 1.

[0029] The utility model has two opening pressure specifications: (35±20)KPa and (7±3.5)KPa. It has two structural forms: forward flow and reverse flow. The weight is less than 2g, and the flow resistance is extremely low during operation. It can be used in 28MPa high-pressure systems. All parts are made of high-performance stainless steel and passivated, so it can work for a long time in harsh environments.

[0030] The above shows and describes the basic principle and main features of the utility model and the advantages of the invention. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the invention, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.

Claims

1. An ultra-light low flow resistance one-way valve, characterized in that: The invention comprises a housing (1), a piston (2), a spring (3) and a spring seat (4); the housing (1) is a tubular structure; the inner wall of the housing (1) is provided with a conical surface structure; the piston (2) is located in the housing (1) and is capable of sliding; one end of the piston (2) is open and the other end is closed; the closed end of the piston (2) is in contact with the conical surface structure in the housing (1); a through hole communicating with the open end of the piston (2) is provided on the side of the piston (2); the open end of the piston (2) is connected to one end of the spring seat (4) via the spring (3); and the spring seat (4) is fixedly connected to the inner wall of the housing (1).

2. The ultra-light low flow resistance one-way valve according to claim 1, characterized in that: The closed end of the piston (2) is a spherical structure, and the conical structure of the housing (1) matches the spherical structure of the piston (2).

3. The ultra-light low flow resistance one-way valve according to claim 1, characterized in that: The outer wall of the piston (2) and the inner wall of the housing (1) are connected by a clearance fit.

4. The ultra-light low flow resistance one-way valve according to claim 1, characterized in that: A plug (5) is detachably connected to one end of the shell (1), the plug (5) has a through hole in the middle, the outer wall of the plug (5) is a conical structure, and the inner wall of the shell (1) connected to the plug (5) is a conical structure.

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