Mechanical automatic vacuum pressure release valve

Abstract

The utility model belongs to the technical field of pipeline connection, and relates to a mechanical automatic vacuum pressure release valve, which comprises a valve body with an opening at one end, a valve rod, a spring and a sealing ring, the section of the valve rod is T-shaped, the valve rod is movably connected in the valve body, a valve rod mounting hole is arranged in the valve body, pressure release holes are arranged around the valve rod mounting hole, and the sealing ring is arranged in the valve rod mounting hole. The valve rod is sleeved with a gasket, the valve rod is provided with a shaft clamp spring used for preventing the gasket from falling off, the valve rod is sleeved with the spring and located between the gasket and the valve body, the sealing ring is arranged between the opposite faces of the valve body and the valve rod, and a plurality of shaft clamp spring installation grooves are distributed in the valve rod in the axial direction of the valve rod. And a filtering mechanism is arranged at the opening end of the valve body. The filtering mechanism is used for filtering fluid passing through the valve body, and the critical pressure can be adjusted by adjusting the position of the clamping spring so as to adapt to different scenes.

Description

Technical Field

[0001] The utility model relates to the technical field of pipeline connection, and particularly relates to a mechanical automatic vacuum relief valve. Background Technique

[0002] At present, in a vacuum system, most of the common relief valves are of two types: manual pressure relief and automation controlled by a computer PLC program. In a simple system, if one wants to achieve automatic pressure relief without overly complex program control, there are relatively few such products on the market.

[0003] Patent No. CN201020638517.0 discloses a liquid tank with an automatic relief valve. The automatic relief valve includes a valve body, a valve core, a spring and a sealing ring. A valve hole is provided inside the valve body. The valve core is arranged in the valve hole. A first mating surface and a second mating surface are respectively provided between the valve body and the valve core. The first mating surface and the second mating surface face each other. The sealing ring is arranged between the first mating surface and the second mating surface. The spring is arranged between the valve core and the valve body. The first mating surface and the second mating surface are conical surfaces. The production efficiency of the utility model is high, the structure is simple, and the sealing performance is good. Under the action of the spring pressure, the second mating surface at the head of the valve core cooperates with the first mating surface of the valve body, and a sealing ring is arranged thereat. Before the fluid overcomes the spring pressure, the valve core will not move, thus achieving a sealing effect. As the fluid pressure increases, the pressure exerted by the fluid on the valve core also increases. When the pressure exerted by the fluid on the valve core exceeds the pressure exerted by the spring on the valve core, the valve core retreats, and the fluid is relieved through the relief hole to achieve the function of pressure reduction and protection. In some use scenarios, the fluid contains impurities, and the automatic relief valve cannot filter the fluid, and the acting force of the spring cannot be adjusted, so the use scenario is limited. Therefore, the utility model provides a mechanical automatic vacuum relief valve. Content of the Utility Model

[0004] The main purpose of the utility model is to provide a mechanical automatic vacuum relief valve, which does not require additional power or control program, can play a pressure reduction and protection function according to a preset pressure, and can filter impurities in the fluid.

[0005] The utility model realizes the above purpose through the following technical solutions: A mechanical automatic vacuum relief valve includes a valve body with one end open, a valve rod, a spring and a sealing ring. The cross-section of the valve rod is T-shaped. The valve rod is movably connected in the valve body. A valve rod mounting hole is provided in the valve body. Relief holes are provided around the valve rod mounting hole. A washer is sleeved on the valve rod. An axial snap ring for preventing the washer from falling off is provided on the valve rod. The spring is sleeved on the valve rod and is located between the washer and the valve body. The sealing ring is arranged between the opposite surfaces of the valve body and the valve rod. A plurality of axial snap ring mounting grooves are distributed along the axial direction of the valve rod. A filtering mechanism is provided at the open end of the valve body.

[0006] Preferably, the filtering mechanism includes a filter screen. Two hole circlips are installed inside the valve body, and the filter screen is arranged between the two hole circlips.

[0007] Preferably, connection flanges are provided at both ends of the valve body. One end of the valve body with a pressure relief hole protrudes outside the connection flange. On the side of the head of the valve stem facing the valve body, there is a concave matching the valve body to cover the end of the valve body. A sealing ring installation groove is provided on the peripheral surface of the end of the valve body, and the sealing ring is arranged in the sealing ring installation groove.

[0008] Preferably, the filter screen has two parts, including a coarse filter screen and a fine filter screen, and the coarse filter screen is close to the opening side of the valve body.

[0009] The beneficial effect of the technical solution of the present utility model is that this application does not require additional power or a controller, and can relieve pressure when the pressure breaks through a preset value. The filtering mechanism can filter the fluid passing through the valve body. By adjusting the position of the circlip, the critical pressure can be adjusted to adapt to different scenarios. Description of the Drawings

[0010] Figure 1 It is an exploded view of the mechanical automatic vacuum pressure relief valve for the embodiment.

[0011] Figure 2 It is a cross-sectional view of the mechanical automatic vacuum pressure relief valve.

[0012] The numbers in the figure represent:

[0013] 1. Valve body; 2. Valve stem; 3. Spring; 4. Sealing ring; 5. Valve stem installation hole; 6. Pressure relief hole; 7. Washer; 8. Shaft circlip; 9. Shaft circlip installation groove; 10. Filter screen; 11. Hole circlip; 12. Flange. Detailed Description of the Embodiment

[0014] The present utility model will be further described in detail below in conjunction with specific embodiments.

[0015] Embodiment:

[0016] As Figure 1 and Figure 2As shown in the figure, a mechanical automatic vacuum relief valve of the present utility model includes a valve body 1 with an open end, a valve stem 2, a spring 3, and a sealing ring 4. The cross-section of the valve stem 2 is T-shaped. The valve stem 2 is movably connected within the valve body 1. A valve stem mounting hole 5 is provided within the valve body 1, and a pressure relief hole 6 is provided around the valve stem mounting hole 5. A washer 7 is sleeved on the valve stem 2, and a shaft circlip 8 for preventing the washer 7 from falling off is provided on the valve stem 2. The spring 3 is sleeved on the valve stem 2 and is located between the washer 7 and the valve body 1. The spring 3 is in a compressed state. The sealing ring 4 is provided between the opposite faces of the valve body 1 and the valve stem 2. A plurality of shaft circlip mounting grooves 9 are axially distributed on the valve stem 2. A filtering mechanism is provided at the open end of the valve body 1. The open end of the valve body 1 is connected to a vacuum chamber, and the other end of the valve body 1 is connected to a vacuum chamber or the external atmospheric environment. When the pressure in the vacuum chamber gradually increases, the filtering mechanism first filters out impurities in the air, and the filtered gas impacts the head of the valve stem 2 through the pressure relief hole 6. When the pressure exceeds the acting force of the spring 3 on the valve stem 2, the valve stem 2 is pushed up, and the pressure relief hole 6 is opened for pressure relief. When the pressure is restored, the valve stem 2 resets, thereby regulating the pressure change in the vacuum chamber to play a role in safety protection. A plurality of shaft circlip mounting grooves 9 are provided. When installing, workers can adjust the installation position of the shaft circlip 8 according to the actual scenario, thereby adjusting the compression degree of the spring 3, and thus adjusting the size of the pressure critical value to adapt to different working scenarios.

[0017] The filtering mechanism includes a filter screen 10. Two hole circlips 11 are installed within the valve body 1. The filter screen 10 is provided between the two hole circlips 11. The hole circlips 11 facilitate installation and disassembly, thereby facilitating the replacement of the filter screen 10.

[0018] Both ends of the valve body 1 are provided with connecting flanges 12. The end of the valve body 1 with the pressure relief hole 6 protrudes outside the connecting flange 12. The surface of the valve stem 2 facing the valve body 1 is provided with a concave matching the valve body 1 to cover the end of the valve body 1. A sealing ring mounting groove is provided on the circumferential surface of the end of the valve body 1. The sealing ring 4 is provided within the sealing ring mounting groove.

[0019] The filter screen 10 includes two, namely a coarse filter screen and a fine filter screen. The coarse filter screen is close to the open side of the valve body 1.

[0020] The above are only some embodiments of the present utility model. For those of ordinary skill in the art, without departing from the inventive concept of the present utility model, several deformations and improvements can still be made, and these all belong to the protection scope of the present utility model.

Claims

1. A mechanical automatic vacuum pressure relief valve, comprising a valve body with an opening at one end, a valve stem, a spring and a sealing ring, wherein the cross section of the valve stem is T-shaped, the valve stem is movably connected to the valve body, the valve body is provided with a valve stem mounting hole, a pressure relief hole is provided around the valve stem mounting hole, a gasket is sleeved on the valve stem, a shaft retaining spring is provided on the valve stem for preventing the gasket from falling off, the spring is sleeved on the valve stem and is located between the gasket and the valve body, and the sealing ring is provided between the valve body and the opposite surface of the valve stem, characterized in that: The valve stem is provided with a plurality of shaft retaining spring installation grooves distributed along its axial direction, and the opening end of the valve body is provided with a filtering mechanism.

2. A mechanical automatic vacuum relief valve according to claim 1, characterized in that: The filter mechanism comprises a filter screen, two hole retaining springs are installed in the valve body, and the filter screen is arranged between the two hole retaining springs.

3. A mechanical automatic vacuum relief valve according to claim 1, characterized in that: Both ends of the valve body are provided with connecting flanges, and one end of the valve body with a pressure relief hole protrudes outside the connecting flange. The head of the valve stem is provided with a concave portion matching the valve body on a side facing the valve body, thereby covering the end of the valve body. The circumferential surface of the end of the valve body is provided with a sealing ring installation groove, and the sealing ring is arranged in the sealing ring installation groove.

4. A mechanical automatic vacuum relief valve according to claim 2, characterized in that: The filter screen is provided with two filters including a coarse filter screen and a fine filter screen, and the coarse filter screen is close to the opening side of the valve body.

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