Negative pressure safety valve and negative pressure equipment

Abstract

The utility model provides a negative pressure safety valve and negative pressure equipment. The negative pressure safety valve comprises a valve shell, a valve seat, a valve element and an elastic piece. One end of the valve shell is used for being connected with negative pressure equipment so that the valve shell can communicate with the negative pressure equipment, the other end of the valve shell is provided with a first through hole communicating with the outside, and the valve seat, the valve element and the elastic piece are all arranged in the valve shell; the valve seat and the inner side wall of the valve shell are sealed, and the valve seat is provided with a pressing part. One end of the elastic piece is fixed, and the other end is connected with the valve core; the pressing part is provided with a second through hole, the pressing part, the valve element and the elastic piece are sequentially arranged in the direction away from the first through hole, and elastic force generated when the elastic piece deforms can drive the valve element and the pressing part to be pressed and sealed. The scheme can adapt to negative pressure equipment with different vacuum degree requirements by adjusting the pre-tightening force of the elastic piece, and is suitable for pipelines or equipment needing vacuum during normal operation or work.

Description

A negative pressure safety valve and negative pressure equipment Technical Field

[0001] This utility model relates to the field of mechanical technology, and more specifically, to a negative pressure safety valve and a negative pressure device. Background Technology

[0002] Vacuum negative pressure exists extensively in production and daily life. For example, it's used in cigarette production for dust removal ducts and packaging machines, as well as in carton sealing machines for extracting labels, cartons, and boxes. It can also occur in other production processes due to improper operation, such as when liquid storage tanks are pumping or discharging liquids, creating internal negative pressure. When the negative pressure value is too high (exceeding the equipment or pipeline's capacity to withstand negative pressure), it often leads to safety accidents, causing personal injury or equipment damage.

[0003] To address the aforementioned issues, existing technologies have designed vacuum breaker valves. When a vacuum occurs in the equipment, the vacuum breaker valve will open regardless of the vacuum level, making it unsuitable for pipelines or equipment that require a vacuum during normal operation or work. Summary of the Invention

[0004] In view of this, one of the objectives of this application is to provide a negative pressure safety valve that can solve the problem that the prior art cannot be applied to pipelines or equipment that require a vacuum during normal operation or work.

[0005] To achieve the above technical objectives, the technical solution adopted in this application is as follows:

[0006] This application provides a negative pressure safety valve, including a valve body, a valve seat, a valve core, and an elastic element:

[0007] The valve housing has one end for connection to a negative pressure device, allowing the valve housing to communicate with the negative pressure device, and the other end has a first through hole for communication with the outside. The valve seat, valve core, and elastic element are all disposed inside the valve housing.

[0008] The valve seat is sealed to the inner wall of the valve body, and the valve seat has a pressing part;

[0009] One end of the elastic element is fixed, and the other end is connected to the valve core;

[0010] The clamping part is provided with a second through hole. The clamping part, valve core and elastic element are arranged in sequence along the direction away from the first through hole. The elastic force when the elastic element deforms can drive the valve core and the clamping part to press and seal, so that the end of the second through hole facing the valve core fits against the valve core.

[0011] Furthermore, the negative pressure safety valve also includes:

[0012] An adjusting rod is movably inserted through the valve housing and connected to the valve seat, causing the adjusting rod to drive the valve seat away from the first through hole.

[0013] Furthermore, the valve seat has a circular groove at the top and the adjusting rod has a circular connector at the bottom, the circular connector being embedded in the circular groove.

[0014] Furthermore, the adjusting rod has external threads on its body, the valve housing has a threaded hole, and the adjusting rod is threadedly engaged with the threaded hole.

[0015] Furthermore, the adjusting rod is provided with a first connecting hole, and the valve seat is provided with a second connecting hole, the first connecting hole and the second connecting hole being connected.

[0016] Furthermore, the valve seat also includes a bellows seal, which is connected to the outer peripheral surface of the pressing part. The bellows seal is adapted to the shape inside the valve body and forms a bellows seal with the inner wall of the valve body.

[0017] Furthermore, the valve core is located inside the bellows seal.

[0018] Furthermore, the valve core has an annular groove on the plane facing the pressing part, and a first annular seal is provided in the annular groove, with a portion of the first annular seal extending out of the annular groove toward the pressing part.

[0019] Furthermore, the valve housing includes an upper valve body and a lower valve body arranged vertically, the upper valve body and the lower valve body are detachably connected, the upper valve body includes a pressing part, the lower valve body is used to connect with a negative pressure device, and a second annular seal is provided between the upper valve body and the lower valve body.

[0020] Secondly, this application provides a negative pressure device, including a negative pressure device body, on which the aforementioned negative pressure safety valve is connected.

[0021] The invention employing the above technical solution has the following advantages:

[0022] In the technical solution provided in this application, one end of the valve housing is used to communicate with the negative pressure device, and the other end has a first through hole communicating with the outside. The valve seat, valve core, and elastic element are all disposed inside the valve housing, and the valve seat is sealed to the inner wall of the valve housing. Therefore, after external air enters the valve housing through the first through hole, it will not flow into the negative pressure device through the gap between the valve seat and the inner wall of the valve housing. The external air pressure can act on the pressing part. Since the pressing part, valve core, and elastic element are arranged sequentially in a direction away from the first through hole, the elastic force when the elastic element deforms can drive the valve core and the pressing part to press and seal, so that the end of the second through hole facing the valve core fits against the valve core. Therefore, when the negative pressure device has negative pressure, the vacuum degree of the negative pressure device does not reach the level required by the deformation of the elastic element. When the elastic force is applied, the valve core forms a compression seal with the valve seat under the action of the elastic force of the elastic element. When the vacuum degree of the negative pressure equipment continues to increase, causing the external air pressure acting on the compression part to exceed the elastic force of the elastic element, the valve core will move in the direction of compressing the elastic element, resulting in a gap between the valve core and the compression part. External air will enter the negative pressure equipment through the first through hole and the second through hole in sequence, thereby reducing the vacuum degree in the negative pressure equipment, preventing damage to the equipment caused by excessive vacuum, and improving the safety of the operation of the negative pressure equipment. Therefore, this solution can be adapted to negative pressure equipment with different vacuum degree requirements by adjusting the preload of the elastic element, and is suitable for pipelines or equipment that require vacuum during normal operation or work. Attached Figure Description

[0023] This application can be further illustrated by the non-limiting embodiments given in the accompanying drawings. It should be understood that the following drawings only illustrate some embodiments of this application and should not be considered as limiting the scope. For those skilled in the art, other related drawings can be obtained from these drawings without any inventive effort.

[0024] Figure 1 is a schematic diagram of the structure provided in an embodiment of this application.

[0025] Figure 2 is a schematic diagram of the AA section of Figure 1 provided in an embodiment of this application.

[0026] Figure 3 is a partial enlarged view of part B of Figure 2 provided in an embodiment of this application.

[0027] Figure 4 is a schematic diagram of the upper valve body structure provided in the embodiment of this application.

[0028] Icons: 100-Valve housing; 110-Upper valve body; 120-Lower valve body; 200-Adjusting rod; 300-Valve seat; 310-Pressure part; 320-Belled seal; 400-Elastic element; 500-Second annular seal; 600-Valve core; 700-First annular seal; 800-First through hole; 900-Second through hole. Detailed Implementation

[0029] The present application will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that similar or identical parts are referred to by the same reference numerals in the drawings or description. Implementations not shown or described in the drawings are forms known to those skilled in the art. In the description of this application, terms such as "first" and "second" are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0030] This embodiment proposes a negative pressure safety valve, as shown in Figures 1-4, including a valve body 100, a valve seat 300, a valve core 600, and an elastic element 400.

[0031] One end of the valve housing 100 is used to connect to a negative pressure device, allowing the valve housing 100 to communicate with the negative pressure device. The other end has a first through hole 800 communicating with the outside. The valve seat 300, valve core 600, and elastic element 400 are all disposed inside the valve housing 100. The communication between the valve housing 100 and the negative pressure device allows the interior of the valve housing 100 to have the same vacuum level as the negative pressure device under the negative pressure generated by the negative pressure device. In this embodiment, the negative pressure device is a device that generates negative pressure during operation. The negative pressure device can be a negative pressure (vacuum) pipeline or a container or tank where negative pressure may occur.

[0032] The valve seat 300 is sealed to the inner wall of the valve body 100, preventing external air from entering the gap between the valve seat 300 and the valve body 100. However, external air can enter the space between the top of the valve seat 300 and the top of the valve body 100 through the first through hole 800.

[0033] The valve seat 300 has a pressing part 310, which is arranged opposite to the valve core 600. That is, when the negative pressure safety valve is installed in a negative pressure device, the pressing part 310 and the valve core 600 are arranged vertically.

[0034] In this embodiment, the pressing part 310 is provided with a second through hole 900. The pressing part 310, the valve core 600 and the elastic element 400 are arranged in sequence along the direction away from the first through hole 800. The elastic force of the elastic element 400 when it deforms can drive the valve core 600 and the pressing part 310 to press and seal, so that the end of the second through hole 900 facing the valve core 600 fits against the valve core 600.

[0035] In this embodiment, when the elastic element 400 is a compression spring, when the valve seat 300 moves away from the first through hole 800, causing the pressing part 310 to press the valve core 600, the elastic element 400 deforms, sealing the pressing part 310 with the valve core 600. The end of the second through hole 900 facing the valve core 600 is in contact with the valve core 600. One end of the elastic element 400 is fixed, and the other end is connected to the valve core 600. Since the valve seat 300 can move within the valve housing 100 in a direction away from the first through hole 800, the pressing part 310 can press the valve core 600 through the movement of the valve seat 300, thereby causing the elastic element 400 to be compressed. The greater the length of the compressed elastic element 400, the greater the elastic force that the elastic element 400 can provide. Under the action of the elastic force, the pressing part 310 and the valve core 600 are tightly pressed and sealed.

[0036] When the elastic element 400 is a tension spring, the elastic force of the tension spring can drive the valve core 600 to press against the clamping part 310 of the valve seat 300. The longer the tension spring, the smaller the clamping force that drives the valve core 600 to press against the clamping part 310.

[0037] In this embodiment, since the valve seat 300 is sealed to the inner wall of the valve housing 100, and the clamping part 310 is tightly fitted to the valve core 600, the clamping part 310 and the valve core 600 are sealed together. The end of the second through hole 900 facing the valve seat 300 is fitted to the clamping part 310. Therefore, external air is blocked between the valve seat 300 and the valve housing 100, and between the clamping part 310 and the valve core 600. That is, through the above structure, when the valve seat 300 and the valve core 600 are tightly connected, the valve seat 300 and the valve core 600 form a sealing surface, preventing external air from entering the negative pressure device. As the vacuum level of the negative pressure equipment increases, the pressure exerted by outside air on the upper part of the valve core 600 increases. When this pressure is less than the elastic force of the elastic element 400, the valve core 600 remains tightly fitted to the clamping part 310. As the vacuum level continues to increase until this pressure exceeds the elastic force of the elastic element 400, the valve core 600 moves downward under pressure, disengaging from the clamping part 310. The vacuum safety valve is then in the open state, and outside air enters the negative pressure equipment sequentially through the first through hole 800, the second through hole 900, and the gap between the valve core 600 and the clamping part 310, thereby reducing the vacuum level of the negative pressure equipment and preventing damage caused by excessive vacuum. When the vacuum level in the pipeline, tank, or container decreases, the pressure difference between it and the outside air decreases, reducing the pressure acting on the upper part of the valve core 600. Under the action of the elastic force, the valve core 600 moves upward, and the valve core 600 and the clamping part 310 are tightly connected, putting the vacuum safety valve in the closed state.

[0038] In this embodiment, the vacuum threshold that the negative pressure safety valve can adapt to can be adjusted by adjusting the elastic coefficient of the elastic element 400, or by adjusting the compression or tension of the elastic element 400.

[0039] In this embodiment, the valve housing 100 includes an upper valve body 110 and a lower valve body 120, which are arranged vertically and connected together by bolts and nuts via a flange. To prevent leakage, a second annular seal 500 is provided between the upper valve body 110 and the lower valve body 120. The lower part of the lower valve body 120 is a flange for installation on negative pressure equipment (smaller sizes can also be designed with pipe threads for connection to pipes, tanks, or containers).

[0040] This embodiment also includes an adjusting rod 200, which is movably inserted through the valve housing 100 and connected to the valve seat 300, causing the adjusting rod 200 to move the valve seat 300 away from the first through hole 800. The valve seat 300 has a circular groove at its top, and the adjusting rod 200 has a circular connector at its bottom, which is embedded in the circular groove. The adjusting rod 200 has external threads, and the valve housing 100 has a threaded hole, with the adjusting rod 200 threadedly engaging with the threaded hole. With the above structure, when the adjusting rod 200 is rotated in a certain direction (clockwise or counterclockwise), it can drive the adjusting rod 200 to move linearly towards the inside of the valve housing 100, thereby pressing the valve seat 300 and moving it towards the valve core 600 until the pressing part 310 is tightly fitted with the valve core 600. Thus, by adjusting the length of the adjusting rod 200 entering the valve housing 100, the position of the valve seat 300 can be adjusted. Furthermore, by the valve seat 300 pressing the valve core 600, the deformation of the elastic element 400 can be adjusted, thereby adjusting the vacuum level that the negative pressure safety valve proposed in this embodiment can adapt to. In this embodiment, the opening and closing pressure that the negative pressure safety valve can adapt to can be calibrated by experimenting with the deformation of the elastic element 400 and the insertion depth of the adjusting rod 200. Marks are made on the adjusting rod 200 to characterize the mapping relationship between the insertion depth of the adjusting rod 200 and the adaptable vacuum level. Therefore, when the vacuum level of the negative pressure device is such that the external pressure does not exceed the elastic force of the elastic element 400, the valve core 600 and the valve seat 300 are tightly fitted together. When the external pressure exceeds the elastic force of the elastic element 400, the valve core 600 further compresses the elastic element 400, and a gap appears between the valve core 600 and the valve seat 300, and the vacuum safety valve is in the open state.

[0041] In this embodiment, the adjusting rod 200 is provided with a first connecting hole, and the valve seat 300 is provided with a second connecting hole, which are connected to each other. This allows for easy adjustment of the opening and closing pressure by passing a lead wire through the first and second connecting holes and then securing it with a lead seal, preventing changes in the opening and closing vacuum caused by manual handling.

[0042] In this embodiment, the valve seat 300 further includes a bellows seal 320, which is connected to the outer peripheral surface of the pressing part 310. The bellows seal 320 is adapted to the shape of the inside of the valve housing 100, and the bellows seal 320 is bellows-sealed with the inner wall of the valve housing 100 to achieve the sealing between the valve seat 300 and the inner wall of the valve housing 100.

[0043] In this embodiment, the valve core 600 is located inside the bellows seal 320. In this embodiment, the bellows seal 320 has a cylindrical structure. The outer wall of the cylindrical structure is provided with outer bellows, and the inner wall of the valve body 100 corresponding to the bellows seal 320 is provided with inner bellows. The outer bellows and the inner bellows are adapted to each other, thereby achieving bellows sealing.

[0044] The valve core 600 has an annular groove on the plane facing the pressing part 310. A first annular seal 700 is provided in the annular groove. A portion of the first annular seal 700 extends out of the annular groove toward the pressing part 310, so that when the pressing part 310 and the valve core 600 are tightly connected, the valve core 600 and the pressing part 310 are sealed.

[0045] This embodiment also proposes a negative pressure device, including a negative pressure device body, on which the aforementioned negative pressure safety valve is connected.

[0046] The above description is merely an embodiment of this application and is not intended to limit the scope of protection of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A negative pressure safety valve, characterized in that, The device includes a valve housing, a valve seat, a valve core, and an elastic element. One end of the valve housing is connected to a negative pressure device, allowing communication between the valve housing and the negative pressure device. The other end has a first through-hole communicating with the outside. The valve seat, valve core, and elastic element are all disposed inside the valve housing. The valve seat seals against the inner wall of the valve housing and has a pressing portion. One end of the elastic element is fixed, and the other end is connected to the valve core. The pressing portion has a second through-hole. The pressing portion, valve core, and elastic element are arranged sequentially along a direction away from the first through-hole. The elastic force of the elastic element during deformation can drive the valve core and the pressing portion to press and seal, causing the end of the second through-hole facing the valve core to fit against the valve core.

2. The negative pressure safety valve according to claim 1, characterized in that, The negative pressure safety valve further includes an adjusting rod, which is movably inserted through the valve body and connected to the valve seat, so that the adjusting rod drives the valve seat to move away from the first through hole.

3. The negative pressure safety valve according to claim 2, characterized in that, The valve seat has a circular groove at the top and the adjusting rod has a circular connector at the bottom, which is embedded in the circular groove.

4. The negative pressure safety valve according to claim 2, characterized in that, The adjusting rod has external threads on its body, the valve housing has a threaded hole, and the adjusting rod is threadedly engaged with the threaded hole.

5. The negative pressure safety valve according to claim 2, characterized in that, The adjusting rod is provided with a first connecting hole, and the valve seat is provided with a second connecting hole, and the first connecting hole and the second connecting hole are connected.

6. The negative pressure safety valve according to claim 1, characterized in that, The valve seat also includes a bellows seal, which is connected to the outer peripheral surface of the pressing part. The bellows seal is adapted to the shape inside the valve body and is bellows-sealed with the inner wall of the valve body.

7. The negative pressure safety valve according to claim 6, characterized in that, The valve core is located inside the corrugated seal.

8. The negative pressure safety valve according to claim 1, characterized in that, The valve core has an annular groove on the plane facing the pressing part, and a first annular seal is provided in the annular groove, with a portion of the first annular seal extending out of the annular groove toward the pressing part.

9. The negative pressure safety valve according to claim 1, characterized in that, The valve housing includes an upper valve body and a lower valve body arranged vertically, the upper valve body and the lower valve body are detachably connected, the upper valve body includes a pressing part, the lower valve body is used to connect to a negative pressure device, and a second annular seal is provided between the upper valve body and the lower valve body.

10. A negative pressure device, characterized in that, It includes a negative pressure device body, on which a negative pressure safety valve according to any one of claims 1-9 is connected.

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