Breather valve based on comma metal sealing ring

Abstract

The utility model discloses a breather valve based on a comma metal sealing ring. A step groove is formed in the upper portion of the base, the supporting seat is arranged in the base in a matched mode, the rubber sealing ring is arranged between the base and the supporting seat, the comma metal sealing ring is hooped in the supporting seat, the pressing head is arranged on the supporting seat, the pressing plate covers the step groove of the base, and the pressing head and the comma metal sealing ring form a sealing face. Gas exchange is completed through opening and closing of the sealing face. The breathing function of the breather valve is mainly controlled by the comma metal sealing ring, the breather valve is hooped in the supporting seat, the relative position is stable, and the breather valve cannot move under the action of load; the phenomenon that a valve disc of a common breather valve is stuck does not exist after the breather valve is used for a long time, meanwhile, the comma metal sealing ring is sensitive to negative pressure, air suction can be started when tiny negative pressure exists, and an oil tank is prevented from being shrunken due to suction.

Description

Technical Field

[0001] The utility model relates to the technical field of breathing valves, in particular to a breathing valve based on a comma metal sealing ring. Background Art

[0002] Breather valves are commonly used on fuel tanks in engine fuel supply systems. They open when the tank pressure exceeds a specified value to maintain the tank's boost pressure. They open when negative pressure develops in the tank to allow atmospheric pressure to flow into the tank for protection. Currently, commonly used breather valves consist of a valve body, valve stem, valve cover, positive and negative valve discs, and springs. They operate by utilizing the weight of the disc and the spring force to control the breather pressure. These breather valves have the following disadvantages:

[0003] 1. A single valve disc and spring combination can only perform one action, either exhalation or inhalation. Therefore, this breathing valve structure is similar to a tee, with one port connected to the fuel tank and a valve disc and spring combination at each of the other two ports, respectively, to perform the exhalation and inhalation functions. As a result, this structure is complex, heavy, and occupies a large space, making it unsuitable for applications where weight and space are critical.

[0004] 2. If the breathing valve is not installed correctly or the valve stem is corroded, the valve seat cannot move into place when moving up and down along the guide rod, and the valve disc will be stuck in a certain part of the guide rod, causing the fuel tank to be deflated and affecting the engine output power.

[0005] 3. When used for small pressure, a spring with a smaller elastic coefficient must be used. However, in actual use, the elastic coefficient of a spring with a smaller elastic coefficient will change as the use time increases, causing the spring accuracy to decrease. Utility Model Content

[0006] In order to solve the above technical problems, the utility model provides a breathing valve based on a comma metal sealing ring.

[0007] The technical solution of the utility model to solve the above technical problems is as follows: a breathing valve based on a comma metal sealing ring, including a base with a step groove on the upper part, a support seat arranged in the base, a rubber sealing ring arranged between the base and the support seat, a comma metal sealing ring clamped in the support seat, a pressure head arranged on the support seat, and a pressure plate covering the step groove of the base. The pressure head and the comma metal sealing ring form a sealing surface, and gas exchange is completed through the opening and closing of the sealing surface.

[0008] Furthermore, a wave spring is provided between the pressure head and the pressure plate, and the elastic force provided by the wave spring can press the pressure head and the support seat tightly.

[0009] Furthermore, the base includes a base body and a threaded section arranged at the lower end of the base body, and the threaded section is used to connect with the oil tank.

[0010] Further, the pressing plate is connected to the base by screws.

[0011] Further, the rubber sealing ring is an O-ring rubber sealing ring.

[0012] The utility model has the following beneficial effects: A breather valve based on a comma-shaped metal sealing ring provided by the utility model has a reliable structure. The breather valve as a whole has a straight pipe structure, and has the advantages of simple structure, light weight and small occupied space compared with common breather valves, and can be used in occasions with demanding requirements for weight and space.

[0013] In addition, the breathing function of the breather valve is mainly controlled by the comma-shaped metal sealing ring, which is hoop-mounted in the support seat and has a stable relative position and will not move under the action of load. There is no phenomenon of valve disc jamming existing in common breather valves during long-term use. At the same time, the comma-shaped metal sealing ring is very sensitive to negative pressure and can start to inhale when there is a slight negative pressure, avoiding the fuel tank from being sucked flat.

[0014] Moreover, by adjusting the structural dimensions and materials of the comma-shaped metal sealing ring, a structure suitable for small pressures can be designed. And when the pressure in the fuel tank increases sharply, the pressure head can be lifted to quickly release the pressure and protect the fuel tank. After part of the pressure is released, the pressure head fits with the support seat under the action of the wave spring to stably exhale the gas. The wave spring does not affect the rated exhaling pressure, so it can avoid the problem of low adjustment accuracy existing in common breather valves when adjusting the breathing pressure by means of the spring elasticity. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is an exploded structural schematic diagram of the utility model;

[0016] Figure 2 is a structural schematic diagram of the utility model in the assembled state;

[0017] Figure 3 is a structural schematic diagram of the comma-shaped metal sealing ring in the utility model;

[0018] Figures 1 to 3 The reference numerals shown in the figure are respectively represented as: 1 - screw, 2 - pressing plate, 3 - wave spring, 4 - pressure head, 5 - comma-shaped metal sealing ring, 6 - support seat, 7 - rubber sealing ring, 8 - base. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] The principles and features of the present utility model will be described below in conjunction with the accompanying drawings. The examples given are only used to explain the present utility model and are not intended to limit the scope of the present utility model.

[0020] Such as Figures 1 to 3As shown in the figure, a breather valve based on a comma-shaped metal sealing ring includes a base 8 with a stepped groove at the upper part, a support seat 6 fitted inside the base 8, a rubber sealing ring 7 disposed between the base 8 and the support seat 6, a comma-shaped metal sealing ring 5 hoop-mounted inside the support seat 6, a press head 4 provided on the support seat 6, and a pressing plate 2 covering the stepped groove of the base 8. The pressing plate 2 is connected to the base 8 by screws 1. The press head 4 and the comma-shaped metal sealing ring 5 form a sealing surface, and gas exchange is completed through the opening and closing of this sealing surface. The rubber sealing ring 7 is an O-shaped rubber sealing ring, which seals the connection between the support seat 6 and the base 8 to prevent gas from leaking between the support seat 6 and the base 8, thereby preventing gas from leaking outside the fuel tank. The base 8 includes a base body 80 and a threaded section 82 provided at the lower end of the base body 80. The threaded section 82 is used to connect to the fuel tank, and other parts are fitted and connected to the base body 80.

[0021] The comma-shaped metal sealing ring 5 is hoop-mounted in the support seat 6, so that its relative position with the support seat 6 is fixed. No matter which side of the comma-shaped metal sealing ring 5 has a larger pressure difference, it can perform a separation action with the press head 4, that is, the exhalation and inhalation actions. When the pressure difference is lower than the sealing pressure, the comma-shaped metal sealing ring 5 and the press head 4 return to the fitting state.

[0022] The press head 4 and the comma-shaped metal sealing ring 5 form a sealing surface. When the pressure in the fuel tank increases sharply, the press head 4 can be lifted by the gas, so that the sealing surface is quickly separated to achieve pressure relief and protect the fuel tank. Gas exchange is completed through the opening and closing of this sealing surface. The comma-shaped metal sealing ring 5 has the structural characteristic that the positive and negative sealing pressures are different. The breathing pressure can be controlled by adjusting its structural dimensions such as material thickness and cross-sectional height and the material. The press head 4 is affected by the gas pressure in the fuel tank, the supporting force of the comma-shaped metal sealing ring 5, the supporting force of the support seat 6, the elastic force of the corrugated spring 3 and its own gravity. When the gas pressure in the fuel tank increases to the rated exhalation pressure, it should be ensured that the press head 4 has no upward displacement at this time, that is, the supporting force of the support seat 6 on the press head 4 is not zero at this time. However, when the gas pressure in the fuel tank is greater than the rated exhalation pressure, it should be ensured that the press head 4 can move upward to increase the gas discharge amount, that is, the press head 4 and the support seat 6 are separated at this time, and the supporting force of the support seat 6 on the press head 4 is zero. Therefore, in the initial state, the supporting force of the support seat 6 on the press head 4 should be approximately equal to the force exerted by the rated exhalation pressure on the press head 4.

[0023] A corrugated spring 3 is provided between the press head 4 and the pressing plate 2. The elastic force provided by the corrugated spring 3 can press the press head 4 and the support seat 6 tightly. The corrugated spring 3 has a force compensation function, which can ensure the overall structural stability. When the pressure in the tank increases sharply, it is compressed to make the press head 4 move upward to increase the discharge amount.

[0024] The above are only the preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A breather valve based on a comma-shaped metal sealing ring, characterized in that, It includes a base (8) with a stepped groove at the upper part, a support seat (6) fitted in the base (8), a rubber sealing ring (7) arranged between the base (8) and the support seat (6), a comma-shaped metal sealing ring (5) hoop-mounted in the support seat (6), a pressure head (4) arranged on the support seat (6), and a pressing plate (2) covering the stepped groove of the base (8). A sealing surface is formed between the pressure head (4) and the comma-shaped metal sealing ring (5), and gas exchange is completed through the opening and closing of this sealing surface.

2. The breather valve based on a comma-shaped metal sealing ring according to claim 1, characterized in that, A corrugated spring (3) is arranged between the pressure head (4) and the pressing plate (2), and the elastic force provided by the corrugated spring (3) can press the pressure head (4) and the support seat (6) tightly.

3. The breather valve based on a comma-shaped metal sealing ring according to claim 1, characterized in that, The base (8) includes a base body (80) and a threaded section (82) arranged at the lower end of the base body (80), and the threaded section (82) is used for connecting with the fuel tank.

4. The breather valve based on a comma-shaped metal sealing ring according to claim 1, characterized in that, The pressing plate (2) is connected to the base (8) by screws (1).

5. The breather valve based on a comma-shaped metal sealing ring according to any one of claims 1 to 3, characterized in that The rubber sealing ring (7) is an O-shaped rubber sealing ring.

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