Two-way breather valve

Abstract

The utility model belongs to mechanical engineering field, and the utility model discloses a bidirectional breathing valve, which can complete the gas suction and discharge in the oil cylinder through one device. The upper end of the breathing valve body is communicated with the discharge pipe through the discharge channel, and the lower end of the breathing valve body is blocked by the gasket, but the gasket has a gas injection through hole in the middle. The inside of the breathing valve body is a valve body cavity, and there is a safety valve core in the valve body cavity. The inside of the safety valve core has a valve core cavity, and the bottom of the valve core cavity is blocked by a small gasket. The utility model completes the gas suction into the oil cylinder B and the gas discharge from the oil cylinder B through one valve body, saves the processing procedure, and facilitates the installation and maintenance.

Description

Technical Field

[0001] This utility model belongs to the field of mechanical engineering, and in particular relates to the improvement of valves. Background Technology

[0002] A valve, or control device, is an installation used to transport fluids; it comes in many types. A hydraulic pump is crucial in a hydraulic system, converting mechanical energy into hydraulic energy to provide the entire system with fluid at a specific pressure and flow rate. Valves are used in hydraulic pumps to control the direction of fluid flow. See [link / reference]. Figure 3 The hydraulic pump consists of cylinder B and pump body C. During operation, the pump needs to supply fluid from cylinder B to pump body C. Simultaneously, gas needs to be introduced into cylinder B. A common approach is to use a simple check valve, which draws in gas under negative pressure. However, when fluid flows back from pump body C to cylinder B, the gas needs to be expelled. Since the check valve is closed, only one vent port is open, allowing gas to be expelled while fluid is being introduced. While this structure solves the problem of gas intake and exhaust in the hydraulic pump, it is not only cumbersome but also uncontrollable. Summary of the Invention

[0003] The purpose of this invention is to design a two-way breathing valve that can complete the intake and exhaust of gas in the oil cylinder through a single device.

[0004] The upper end of the breathing valve body of this utility model is connected to the discharge pipe through the discharge channel, and the lower end of the breathing valve body is sealed by a gasket, but the gasket has an air injection hole in the middle. The inside of the breathing valve body is a valve body cavity, and inside the valve body cavity is a safety valve core. The safety valve core is divided into two sections: the upper section is a conical cap and the lower section is cylindrical. A large spring is fitted on the outside of the cylindrical section. The top of the large spring rests on the bottom of the conical cap, and the bottom end rests on the gasket. The bottom of the discharge channel corresponding to the conical cap is a conical cap groove. The safety valve core has a valve core cavity inside, and the bottom of the valve core cavity is sealed by a small gasket, but the small gasket has a small gasket through hole in the middle, and the valve core cavity has a valve core through hole at the upper end; there is a steel ball in the valve core cavity, and a small spring is installed between the steel ball and the upper edge of the valve core cavity.

[0005] In this invention, a large O-ring is installed inside the valve body cavity outside the cone-shaped cap at the top of the safety valve core.

[0006] This invention features a small O-ring installed below the valve core cavity.

[0007] This invention uses a single valve body to both draw gas into and discharge gas from cylinder B, saving on processing steps and facilitating installation and maintenance. Attached Figure Description

[0008] Figure 1 This is a schematic diagram of the exploded structure of this utility model; Figure 2 This is an axial sectional view of the present invention; Figure 3 This is a schematic diagram of the present invention installed on a hydraulic pump. In the diagram, A is the valve assembly of the present invention, B is the oil cylinder, C is the pump body, D is the external oil pipe, and E is a clearance hole opened on the pump body to facilitate the passage of the present invention. Detailed Implementation

[0009] The upper end of the breather valve body 1 of this utility model is connected to the external oil pipe D through the discharge channel 13, and the lower end of the breather valve body 1 is sealed by a gasket 9, but the gasket 9 has an air injection hole 10 in the middle. Figure 2 The breather valve body 1 and the gasket 9 form a closed space, but there is a through hole at the upper and lower ends of this closed space. The upper through hole (discharge channel 13) is connected to a conduit (external oil pipe D) to communicate with the outside. This conduit can be omitted, but sometimes the fluid in the oil cylinder B may overflow in small amounts (acting as an overflow valve), which will contaminate the nearby equipment. Therefore, it is necessary to analyze whether to add this conduit based on the actual situation. The lower through hole (air injection through hole 10) communicates with the inside of the oil cylinder B.

[0010] The interior of the breathing valve body 1 is a valve body cavity 12. Inside the valve body cavity 12 is a safety valve core 3, which is divided into two sections: an upper conical cap and a lower cylindrical section. A large spring 5 is fitted around the cylindrical section, with its top end resting on the bottom of the conical cap and its bottom end resting on the gasket 9. The bottom of the discharge channel 13 corresponding to the conical cap is a conical cap groove 16. The valve body cavity 12, consisting of the breathing valve body 1 and the gasket 9, forms a closed space within which the safety valve core 3 is placed. As shown in the diagram, it is a suspended valve, capable of vertical movement within the valve body cavity 12. The upper section of the suspended valve (safety valve core 3) resembles a cap, with a conical top, hence the name "conical cap." This conical cap matches the conical cap groove 16, meaning it can enter and seal within the groove. The lower section of the suspension valve is cylindrical (in this invention, it is cylindrical), and a spring (large spring 5) is sleeved on the cylindrical section. This spring is locked between the conical cap and the washer 9, so that the spring is compressed when the suspension valve descends.

[0011] The safety valve core 3 has a valve core cavity 11 inside. The bottom of the valve core cavity 11 is sealed by a small gasket 8, but the small gasket 8 has a small gasket through hole 14 in the middle. The valve core cavity 11 has a valve core through hole 15 at the upper end. There is a steel ball 6 inside the valve core cavity 11, and a small spring 4 is installed between the steel ball 6 and the upper edge of the valve core cavity 11. The safety valve core 3 also has a cavity (valve core cavity 11) inside. This cavity has through holes at both the top and bottom (valve core through hole 15 and small gasket through hole 14) to facilitate the entry or exit of fluid outside the suspension valve into or out of the suspension valve. A ball valve (steel ball 6) is installed in the suspension valve to seal the small gasket through hole 14. Under the action of the fluid pressure below, the ball valve disengages from the small gasket through hole 14 and compresses the spring (small spring 4), allowing fluid to pass through the valve core cavity 11. Conversely, when the fluid enters through the valve core through hole 15, the ball valve is blocked at the small gasket through hole 14 by the combined action of the spring and fluid pressure, preventing the fluid from passing through the small gasket through hole 14.

[0012] The gasket 9 and small gasket 8 described above are designed to facilitate sealing their respective cavities. They are sealing components designed to facilitate the machining of the internal cavity of the breather valve body 1 or the safety valve core 3.

[0013] Combination Figure 2 and Figure 3 Describe the work process: The descent process, also known as the injection of fluid (gas) into the cylinder, involves the following steps: When the fluid (hydraulic oil) in cylinder B supplies the pump body C and the hydraulic cylinder, the fluid (gas) enters the valve core cavity 11 through the discharge channel 13, pushing the steel ball 6 to the small gasket through hole 14 and sealing it. At this point, the fluid pushes the safety valve core 3 downwards, causing its top to disengage from the conical cap groove 16. Simultaneously, it compresses the large spring 5, allowing the fluid to flow downwards from the outer wall of the safety valve core 3, into the valve body cavity 12, and finally into cylinder B through the air injection hole 10, maintaining a constant air pressure balance within cylinder B. In other words, during air intake: when the hydraulic system pressure is negative, the two-way breather valve opens, allowing air to enter the hydraulic system from the outside, thus balancing the system pressure.

[0014] The upward process, which is the process of oil returning to the cylinder and expelling gas: When the oil in pump body C and hydraulic cylinder flows back into cylinder B, it will compress the air in cylinder B. At this time, the air will enter the bottom of valve body cavity 12. Under the combined action of gas and large spring 5, it pushes safety valve core 3 upward until the top of safety valve core 3 enters the conical cap groove 16 and seals it. During this working process, gas simultaneously enters the small gasket through hole 14 and pushes the steel ball 6 to break free from the seal of the small gasket through hole 14. In this way, the gas will enter the discharge channel 13 from the valve core cavity 11 and valve core through hole 15 in sequence and be discharged. Occasionally, when the gas in cylinder B is completely discharged, a very small amount of oil may also be discharged, which acts as an overflow valve. This situation rarely occurs, and even if it does, it will be a very small amount of oil discharged, which will not affect the amount of oil used by the subsequent hydraulic cylinder. In other words, during venting or oiling: when the pressure inside the system exceeds a certain level, the two-way breather valve opens, and excess oil is discharged to the outside through the breather valve, so that the pressure inside the hydraulic system reaches balance.

[0015] In this invention, a large O-ring 8 is installed inside the valve body cavity 12 outside the conical top of the conical cap of the safety valve core 3. Since both the safety valve core 3 and the breather valve body 1 are made of rigid materials, the sealing effect when the conical cap of the safety valve core 3 matches the conical cap groove 16 is not ideal. Therefore, an O-ring is added here to seal from the upper end of the conical cap when the conical cap matches the conical cap groove, preventing the rising gas from entering the discharge channel 13 from the valve body cavity 12.

[0016] This invention features a small O-ring 7 installed below the valve core cavity 11. The small O-ring 7 serves the same function as the large O-ring 8, but it surrounds the steel ball 6 to prevent gas from entering the bottom of the valve body cavity 12 through the small gasket through hole 14 during descent, thereby preventing gas from entering the oil cylinder through this channel.

Claims

1. A bidirectional breathing valve, characterized in that: The upper end of the breathing valve body (1) is connected to the discharge pipe (D) through the discharge channel (13), and the lower end of the breathing valve body (1) is sealed by the gasket (9), but the gasket (9) has an air injection hole (10) in the middle. The inside of the breathing valve body (1) is a valve body cavity (12), and there is a safety valve core (3) in the valve body cavity (12). The safety valve core (3) is divided into two sections: the upper section is a conical cap and the lower section is cylindrical. A large spring (5) is fitted on the outside of the cylindrical section. The top of the large spring (5) rests on the bottom of the conical cap, and the bottom rests on the gasket (9). The bottom of the discharge channel (13) corresponding to the conical cap is a conical cap groove (16). The safety valve core (3) has a valve core cavity (11) inside. The bottom of the valve core cavity (11) is sealed by a small gasket (8), but the small gasket (8) has a small gasket through hole (14) in the middle. The valve core cavity (11) has a valve core through hole (15) at the upper end. There is a steel ball (6) in the valve core cavity (11), and a small spring (4) is installed between the steel ball (6) and the upper edge of the valve core cavity (11).

2. The bidirectional breathing valve according to claim 1, characterized in that: A large O-ring (8) is installed in the valve body cavity (12) outside the cone-shaped cap at the top of the safety valve core (3).

3. The bidirectional breathing valve according to claim 1, characterized in that: A small O-ring (7) is installed below the valve core cavity (11).

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