Ultra-light plug-in overflow valve

Abstract

The utility model discloses an ultra-light plug-in mounting type overflow valve, which is suitable for a 28MPa high-pressure system, and is particularly suitable for the technical field of aerospace control. The overflow valve has the minimum opening pressure of 25 MPa, the weight is smaller than 8 g, the flow resistance is low, and the structure is simple and reliable. The product comprises a shell, a sealing ball, a piston, a spring, a spring seat, a plug and the like, the spring seat is fixed on the shell by adopting a pulse laser welding technology, and the stability of long-term use is ensured. The high-precision matching of the piston and the sealing ball and the interference fit design of the shell and the plug ensure the sealing performance and reliability of the product. Besides, the overflow valve is installed in a plug-in mode, the installation space is reduced, and all the parts are made of high-performance stainless steel materials and subjected to passivating treatment so as to adapt to long-term use in severe environments. Compared with products of the same type on the market, the weight and the size of the overflow valve are reduced by at least one order of magnitude, and the overflow valve has remarkable performance advantages and application potential.

Description

Technical Field

[0001] The utility model relates to a valve, in particular to an ultra-light cartridge type overflow valve. Background Art

[0002] The overflow valve plays an important role in the hydraulic / pneumatic system in the aerospace field and usually exists as an independent component. However, traditional overflow valves have some limitations. For example, the pressure relief pressure is relatively low, the weight is relatively large, and the volume is relatively large. These factors limit their application in high-pressure systems. In high-pressure systems, traditional overflow valves may cause structural damage due to their inability to withstand high pressure, which requires a new type of high-pressure overflow valve to meet the need for safe pressure relief. Summary of the Invention

[0003] The purpose of the utility model is to provide an ultra-light cartridge type overflow valve.

[0004] To achieve the above purpose, the utility model is implemented according to the following technical scheme:

[0005] The utility model includes a housing, a sealing ball, a piston, a spring, and a spring seat. The housing is a tubular structure, the piston is a tubular structure with one end closed. A hemispherical groove is provided at the closed end of the piston. The sealing ball is located in the hemispherical groove of the piston. The other end of the sealing ball contacts the inner wall of the inlet end of the housing. A conical surface matching the piston is provided inside the inlet end of the housing. The piston can slide inside the housing. The inside of the piston is hollow. A through hole communicating with the hollow inside of the piston is provided on the side wall of the closed end of the piston. The other end of the piston is connected to the spring seat through the spring, and the spring seat is fixedly arranged inside the housing.

[0006] The reverse flow type of the utility model is: a conical surface matching the sealing ball is provided at one end of the spring seat. The conical surface of the spring can contact the sealing ball. When the sealing ball contacts the conical surface of the spring seat, the other end of the piston is connected to the inner wall of the housing through the spring.

[0007] As an improvement, a plug is provided on the inner wall of the other end of the housing, and an interference fit connection is adopted between the plug and the housing.

[0008] Preferably, the conical surfaces of the housing and the spring seat are 0° conical surfaces.

[0009] The beneficial effects of the utility model are:

[0010] The utility model is an ultra-light cartridge type overflow valve. Compared with the prior art, the utility model has the following technical effects:

[0011] Light weight: The weight is less than 8g, making it convenient to be used in high-precision equipment such as aerospace.

[0012] High pressure resistance: Stainless steel is used as the valve body material and tungsten carbide is used as the sealing surface material, improving the pressure resistance performance of the product so that it can work stably in a pressure system of 35MPa and above.

[0013] Simple and reliable structure: The product design is simple. The cartridge installation method reduces the pipelines and pipe joints required during installation, reducing the installation space and complexity.

[0014] Low flow resistance: During the working process, the flow resistance is extremely low, improving the efficiency of the hydraulic system.

[0015] Strong adaptability: It has two structural forms of forward flow and reverse flow, adapting to different working requirements. Description of the drawings

[0016] Figure 1 is the sectional view of the forward flow model of the present utility model;

[0017] Figure 2 is the sectional view of the reverse flow model of the present utility model;

[0018] Figure 3 is the schematic diagram of the liquid flow of the forward flow model of the present utility model;

[0019] Figure 4 is the schematic diagram of the liquid flow of the reverse flow model of the present utility model;

[0020] Figure 5 is the schematic diagram of the external structure of the present utility model.

[0021] In the figure: housing 1, sealing ball 2, piston 3, spring 4, spring seat 5, plug 6. Detailed implementation manners

[0022] The present utility model will be further described below in conjunction with the drawings and specific embodiments. The illustrative embodiments and descriptions of this utility model are used to explain the present utility model, but do not limit the present utility model.

[0023] Such as Figures 1-5As shown in the figure: The utility model includes a housing 1, a sealing ball 2, a piston 3, a spring 4, and a spring seat 5. The housing 1 is a tubular structure. The piston 3 is a tubular structure with one end closed. A hemispherical groove is provided at the closed end of the piston 3. The sealing ball 2 is located in the hemispherical groove of the piston 3. The other end of the sealing ball 2 contacts the inner wall of the inlet end of the housing 1. A conical surface matching the piston 3 is provided inside the inlet end of the housing 1. The piston 3 can slide inside the housing 1. The inside of the piston 3 is hollow. A through hole communicating with the hollow inside of the piston 3 is provided on the side wall of the closed end of the piston 3. The other end of the piston 3 is connected to the spring seat 5 through the spring 4. The spring seat 5 is fixedly arranged inside the housing 1.

[0024] The reverse flow type of the utility model is: A conical surface matching the sealing ball 2 is provided at one end of the spring seat 5. The conical surface of the spring 4 can contact the sealing ball 2. When the sealing ball 2 contacts the conical surface of the spring seat 5, the other end of the piston 3 is connected to the inner wall of the housing 1 through the spring 4.

[0025] As an improvement, a plug 6 is provided on the inner wall of the other end of the housing 1. The plug 6 and the housing 1 are connected by interference fit.

[0026] Preferably, the conical surfaces of the housing 1 and the spring seat 5 are 60° conical surfaces.

[0027] The working principle of the utility model is as follows:

[0028] 1. In the closed state: When the ultra-light plug-in overflow valve is completely closed, the hydraulic oil is blocked on both sides of the valve, forming a static isolation area. This can prevent the hydraulic oil from flowing between the upstream and downstream of the valve. The piston 3 is located at the position shown in Figure 1 or Figure 2. Under the action of the spring 4, the spring seat 5, and the spring force, the piston 3 and the housing 1 seal the hydraulic oil through the sealing ball 2. Figure 1 or the position shown in Figure 2. Under the action of the spring 4, the spring seat 5, and the spring force, the piston 3 and the housing 1 seal the hydraulic oil through the sealing ball 2.

[0029] 2. In the open state: When the fluid flows from the downstream to the upstream of the ultra-light plug-in overflow valve, when the pressure difference of the fluid is greater than or equal to 25 MPa, the piston is at the position shown in Figure 1. At this time, the sealing ball starts to be pressurized and is pushed away from the sealing conical surface, allowing the hydraulic oil to pass through. The ultra-light plug-in high-pressure overflow valve is in the open state. Figure 3 or the position shown in Figure 1. At this time, the sealing ball starts to be pressurized and is pushed away from the sealing conical surface, allowing the hydraulic oil to pass through. The ultra-light plug-in high-pressure overflow valve is in the open state.

[0030] 3. In the reflux state: When the hydraulic oil flows from the upstream to the downstream of the ultra-light plug-in overflow valve, due to the pressure difference of the fluid, the sealing ball 2 will automatically return to its position. At this time, the piston 3 is affected by the upstream pressure and presses the sealing ball 2 and the sealing conical surface of the housing 1 tightly together to prevent the hydraulic oil from flowing back.

[0031] In the present utility model, a 60° sealing cone surface and a sealing ball are designed inside the reverse flow type housing and inside the spring seat of the forward flow type to form a line sealing fit.

[0032] In the present utility model, the outer diameter of the piston and the inner diameter of the housing are in clearance fit, and the piston can move reliably within the flow channel of the housing.

[0033] In the present utility model, the housing 1 and the spring seat 5 are connected by pulsed laser welding to ensure that they will not loosen or fall off during long-term use.

[0034] The present utility model is installed in a special installation hole. The plug 6 and the housing 1 are in interference fit. When the plug 6 is pressed into the housing 1, the housing 1 will expand outwards, causing the inner diameter of the installation hole to increase by approximately 0.1 mm to ensure that the entire product is tightly clamped in the installation hole.

[0035] In the present utility model, the inner hole of the plug 6 has an M4 internal thread, which is convenient for removing the entire product from the installation hole using a special tooling.

[0036] In the present utility model, the spring is installed between the piston 3 and the spring seat 5 to provide a pre-tightening force for the sealing fit between the sealing ball 2 and the housing 1.

[0037] The above shows and describes the basic principles, main features and advantages of the present utility model. Those skilled in the art should understand that the present utility model is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present utility model. Without departing from the spirit and scope of the present invention, the present utility model will have various changes and improvements, and these changes and improvements all fall within the scope of the present utility model claimed. The scope of protection claimed by the present utility model is defined by the appended claims and their equivalents.

Claims

1. An ultra-light cartridge relief valve, characterized in that: The invention comprises a housing (1), a sealing ball (2), a piston (3), a spring (4), and a spring seat (5); the housing (1) is a tubular structure; the piston (3) is a tubular structure with one end closed; the closed end of the piston (3) is provided with a hemispherical groove; the sealing ball (2) is located in the hemispherical groove of the piston (3); the other end of the sealing ball (2) contacts the inner wall of the inlet end of the housing (1); the inner side of the inlet end of the housing (1) is provided with a conical surface matching the piston (3); the piston (3) can slide in the housing (1); the interior of the piston (3) is hollow; the side wall of the closed end of the piston (3) is provided with a through hole communicating with the hollow interior of the piston (3); the other end of the piston (3) is connected to the spring seat (5) via the spring (4); and the spring seat (5) is fixedly arranged in the housing (1).

2. The ultra-light cartridge relief valve according to claim 1, characterized in that: One end of the spring seat (5) is provided with a conical surface matching the sealing ball (2), and the conical surface of the spring (4) is capable of contacting the sealing ball (2). When the sealing ball (2) contacts the conical surface of the spring seat (5), the other end of the piston (3) is connected to the inner wall of the housing (1) via the spring (4).

3. The ultra-light cartridge relief valve according to claim 1, characterized in that: A plug (6) is provided on the inner wall of the other end of the shell (1), and the plug (6) and the shell (1) are connected by an interference fit.

4. An ultra-light cartridge relief valve according to claim 1 or 2, characterized in that: The conical surfaces of the housing (1) and the spring seat (5) are 60° conical surfaces.

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