Vacuum check valve mechanism

Abstract

The utility model discloses a vacuum check valve mechanism, and belongs to the technical field of vacuum valves. The vacuum check valve mechanism comprises a valve body and a valve element. A cavity is formed in the upper part of the valve body, and an air inlet and a vacuumizing opening are formed in the lower part of the valve body; the valve element is arranged in the cavity and can slide up and down relative to the valve body in the first direction, the air inlet, the vacuumizing opening and the cavity are communicated or the air inlet is sealed through the valve element, an elastic piece is arranged between the end, away from the vacuumizing opening, of the valve body and the valve element, and an exhaust hole penetrating through the valve element is formed in the valve element in the first direction. The valve element moves towards the end, away from the vacuumizing opening, of the valve body in the first direction so that the cavity can be communicated with the air inlet and the vacuumizing opening. The vacuum check valve mechanism provided by the embodiment of the utility model not only can be matched with vacuumizing equipment to enable the vacuumizing cavity to form a vacuum environment, but also can realize the automatic closing of the valve core and keep the vacuum environment of the vacuumizing cavity, so that the production efficiency is improved.

Description

Technical Field

[0001] This utility model belongs to the field of vacuum valve technology, and specifically relates to a vacuum check valve mechanism. Background Technology

[0002] In fluid piping systems, the valve body is a crucial component controlling the smooth execution of various actions. The opening and closing of the valve body enables the transmission of media such as compressed gas, liquid, and vacuum. A vacuum valve is an important type of valve body, with its two ends fixedly connected to the cavity of the vacuum pumping equipment and the equipment to be vacuumed, thereby providing a vacuum environment for the cavity of the equipment to be vacuumed.

[0003] Currently, under certain specific working conditions, it is necessary to maintain a negative pressure state inside the carrier during the transport process to ensure the carrier continuously adsorbs and fixes the product. However, existing vacuum valves require separation of the vacuum pumping equipment (the vacuum valve is installed on the carrier) after evacuating the carrier to meet the space requirements during transport. Therefore, it is necessary to manually close the vacuum valve to maintain the negative pressure state inside the carrier, but manually closing the vacuum valve will lead to a decrease in production efficiency. Utility Model Content

[0004] In view of the above-mentioned defects or improvement needs of the existing technology, this utility model provides a vacuum check valve mechanism, the purpose of which is to not only cooperate with vacuum equipment to create a vacuum environment in the vacuum chamber, but also to realize the automatic closing of the valve core and maintain the vacuum environment in the vacuum chamber, thereby improving production efficiency.

[0005] To achieve the above objectives, this utility model provides a vacuum check valve mechanism, which includes a valve body and a valve core;

[0006] The upper part of the valve body forms a hollow cavity, and the lower part of the valve body has an air inlet and a vacuum port.

[0007] The valve core is disposed in the cavity and can slide up and down relative to the valve body along the first direction. The valve core connects the air inlet and the vacuum port to the cavity or seals the air inlet. An elastic element is provided between the end of the valve body away from the vacuum port and the valve core. The valve core is provided with an exhaust hole that penetrates the valve core along the first direction.

[0008] When the valve core moves in the first direction toward the end of the valve body away from the vacuum port, the cavity is connected to the air inlet and the vacuum port respectively. At this time, the elastic element is in the first state. When the elastic element resets, the valve core moves in the first direction toward the end of the valve body near the vacuum port to seal the air inlet. At this time, the cavity is connected to the vacuum port through the exhaust hole.

[0009] Optionally, the vacuum check valve mechanism further includes a guide shaft, the axial direction of which is arranged along a first direction, one end of which is fixed to the end of the valve body away from the vacuum port, and the valve core is slidably sleeved on the guide shaft.

[0010] Optionally, the valve core includes a sealing part and a guide part connected to each other, the vent hole passes through the sealing part, the guide part is located in the middle of the sealing part, and one end of the guide part is movably inserted into the vacuum port. A bushing is inserted into the guide part, the guide shaft is movably inserted into the bushing, and the elastic element is sleeved on the guide shaft between the bushing and the end of the valve body away from the vacuum port.

[0011] Optionally, a guide groove is provided in the guide section, and the bushing is coaxially inserted in the guide groove. When the valve core seals the air inlet, in the first direction, the distance between the guide shaft and the guide groove is less than the distance between the end of the valve body away from the vacuum port and the valve core.

[0012] Optionally, the end of the guide portion facing the sealing portion is conical, and the diameter of the conical shape gradually decreases along the direction away from the sealing portion.

[0013] Optionally, the valve body includes a valve shell and a valve cover, the valve cover being disposed on the valve shell, the upper portion of the valve cover and the valve shell forming the cavity, and the air inlet and the vacuum port being located in the lower portion of the valve shell.

[0014] Optionally, the end of the valve housing facing away from the valve cover is provided with an outer flange, and the outer flange has a plurality of spaced connection holes.

[0015] Optionally, a first sealing gasket is provided circumferentially at the connection between the air inlet and the cavity, and a second sealing gasket is provided on the valve core, with the first sealing gasket and the second sealing gasket arranged in parallel relative to each other.

[0016] Optionally, the outer peripheral wall of the valve core is in sliding fit with the inner peripheral wall of the valve body.

[0017] Optionally, there are multiple air inlets, which are arranged at intervals along the circumference of the cavity.

[0018] The aforementioned improved technical features can be combined with each other as long as they do not conflict with each other.

[0019] In summary, the beneficial effects of the above-described technical solutions conceived by this utility model compared with the prior art include:

[0020] The air inlet is connected to the cavity to be evacuated (hereinafter referred to as the vacuum cavity), and the vacuum port is connected to the vacuuming device. When the vacuum cavity needs to be evacuated, the valve core moves in the first direction away from the vacuum port, so that the cavity inside the valve body is connected to the air inlet and the vacuum port respectively, so that the vacuum cavity is evacuated by the vacuuming device. When the air inlet needs to be sealed to separate the valve body from the vacuuming device, the force generated by the elastic element returning to its original position causes the valve core to move in the first direction towards the end of the valve body closer to the vacuum port to seal the air inlet. Then the vacuuming device is separated from the vacuum port. At this time, the vacuum port is connected to the atmosphere. The pressure generated by the cavity being connected to the atmosphere through the exhaust port further exerts pressure on the valve core towards the air inlet, thereby making the valve core seal the air inlet more effectively, so as to ensure that there is no gas leakage in the vacuum cavity after the vacuuming device is removed. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of a vacuum check valve mechanism provided in an embodiment of the present invention;

[0022] Figure 2 This is a cross-sectional view of a vacuum check valve mechanism in an open state, provided by an embodiment of this utility model.

[0023] Figure 3 This is a cross-sectional view of a vacuum check valve mechanism provided in this embodiment of the present invention, showing the valve core in the closed state.

[0024] In all the accompanying drawings, the same reference numerals denote the same technical features, specifically:

[0025] 1. Valve body; 11. Cavity; 12. Air inlet; 13. Vacuum port; 14. Valve shell; 141. Outer flange; 15. Valve cover; 16. First sealing gasket; 2. Valve core; 21. Exhaust port; 22. Sealing part; 23. Guide part; 231. Bushing; 232. Guide groove; 24. Second sealing gasket; 3. Elastic element; 4. Guide shaft. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the present utility model and are not intended to limit the present utility model. Furthermore, the technical features involved in the various embodiments of the present utility model described below can be combined with each other as long as they do not conflict with each other.

[0027] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0028] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0029] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0030] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0031] Example:

[0032] Figure 1 This is a schematic diagram of a vacuum check valve mechanism provided in an embodiment of the present invention. Figure 2 This is a cross-sectional view of a vacuum check valve mechanism with the valve core in the open state, provided in an embodiment of this utility model. Figure 3This is a cross-sectional view of a vacuum check valve mechanism provided in this embodiment of the invention, showing the valve core in the closed state. Figure 1-3 As shown, the vacuum check valve mechanism includes a valve body 1 and a valve core 2.

[0033] The upper part of the valve body 1 forms a hollow cavity 11, and the lower part of the valve body 1 has an air inlet 12 and a vacuum port 13.

[0034] The valve core 2 is disposed within the cavity 11 and can be positioned relative to the valve body 1 along a first direction (e.g.: Figure 2 The valve core 2 slides up and down along the Z-axis direction (i.e., the vertical direction) to connect or seal the air inlet 12, vacuum port 13 and cavity 11. An elastic element 3 is provided between the end of the valve body 1 away from the vacuum port 13 and the valve core 2. The valve core 2 is provided with an exhaust hole 21 that penetrates the valve core 2 along the first direction.

[0035] When the valve core 2 moves in the first direction toward the end of the valve body 1 away from the vacuum port 13, the cavity 11 is connected to the air inlet 12 and the vacuum port 13 respectively. At this time, the elastic element 3 is in the first state. When the elastic element 3 is reset, the valve core 2 moves in the first direction toward the end of the valve body 1 close to the vacuum port 13 to seal the air inlet 12. At this time, the cavity 11 is connected to the vacuum port 13 through the exhaust hole 21.

[0036] In the present invention, the vacuum check valve mechanism is used such that the air inlet 12 is connected to the cavity to be evacuated (hereinafter referred to as the vacuum cavity, i.e. the internal cavity of the carrier), and the vacuum port 13 is connected to the vacuum device. When it is necessary to evacuate the vacuum chamber, the valve core 2 moves in the first direction toward the end away from the vacuum port 13, so that the cavity 11 inside the valve body 1 is connected to the air inlet 12 and the vacuum port 13 respectively, so as to evacuate the vacuum chamber through the vacuum device. When it is necessary to seal the air inlet 12 to separate the valve body 1 from the vacuum device, the force generated by the reset of the elastic element 3 causes the valve core 2 to move in the first direction toward the end of the valve body 1 closer to the vacuum port 13 to seal the air inlet 12. Then the vacuum device is separated from the vacuum port 13. At this time, the vacuum port 13 is connected to the atmosphere. The pressure generated by the cavity 11 communicating with the atmosphere through the exhaust hole 21 further exerts pressure on the valve core 2 against the air inlet 12, thereby making the sealing effect of the valve core 2 on the air inlet 12 better, so as to ensure that there is no gas leakage in the vacuum chamber after the vacuum device is removed.

[0037] In other words, the vacuum check valve mechanism provided in this embodiment of the present invention can not only work with vacuum equipment to create a vacuum environment in the vacuum chamber, but also realize the automatic closing of the valve core 2 and maintain the vacuum environment in the vacuum chamber, thereby improving production efficiency.

[0038] For example, the movement of the valve core 2 toward the end away from the vacuum port 13 in the first direction can be achieved by setting a cylinder in the vacuum pipeline and driving the movement of the valve core 2 through the cylinder.

[0039] It is easy to understand that when valve core 2 needs to be opened again, the vacuuming device is reconnected to the vacuum port 13 and a vacuum is created, thus ultimately achieving vacuuming of cavity 11 through exhaust port 21. At this time, due to a certain amount of leakage in the vacuuming cavity (a slight leakage of negative pressure occurs when the carrier adsorbs the product through the adsorption port), its pressure is greater than the pressure in cavity 11, forming a certain pressure difference. This difference, combined with the upward movement of the cylinder, facilitates the opening of valve core 2. Therefore, during the reopening of valve core 2, the exhaust port 21 allows for vacuuming of cavity 11, avoiding the need for valve core 2 to overcome atmospheric pressure during opening, thus eliminating the need for a high-power cylinder.

[0040] For example, the elastic element 3 can be a spring.

[0041] Furthermore, there can be multiple air inlets 12, which are arranged at intervals along the circumference of the cavity 11 to increase the vacuuming efficiency of the vehicle. Additionally, a vacuum port 13 is located between the multiple air inlets 12.

[0042] In one embodiment of this utility model, the outer peripheral wall of the valve core 2 slides in conjunction with the inner peripheral wall of the valve body 1.

[0043] In the above embodiment, the sliding fit between the outer peripheral wall of the valve core 2 and the inner peripheral wall of the valve body 1 can guide the valve core 2 to move up and down in the first direction.

[0044] In another implementation of this utility model, the vacuum check valve mechanism further includes a guide shaft 4. The axial direction of the guide shaft 4 is arranged along the first direction. One end of the guide shaft 4 is fixed to the end of the valve body 1 away from the vacuum port 13. The valve core 2 is slidably sleeved on the guide shaft 4. The guide shaft 4 can also guide the sliding of the valve core 2.

[0045] Furthermore, the valve core 2 includes a sealing part 22 and a guide part 23 connected to each other. The exhaust port 21 passes through the sealing part 22. The guide part 23 is located in the middle of the sealing part 22, and one end of the guide part 23 is movably inserted into the vacuum port 13. A bushing 231 is inserted into the guide part 23. The guide shaft 4 is movably inserted into the bushing 231. The elastic element 3 is sleeved on the guide shaft 4 between the bushing 231 and the end of the valve body 1 away from the vacuum port 13.

[0046] In the above embodiment, the friction between the guide shaft 4 and the valve core 2 can be reduced by the cooperation of the bushing 231 and the guide shaft 4, thereby extending the service life of the guide shaft 4 and the valve core 2.

[0047] For example, the bottom end of the elastic member 3 abuts against the top end of the bushing 231. In addition, the sealing part 22 is a plate-shaped structure arranged horizontally, and the guide part 23 is a column-shaped structure arranged vertically. The sealing part 22 and the guide part 23 are integrally formed into a T-shape.

[0048] It is easy to understand that the guide part 23 is located inside the vacuum port. During the process of the valve core 2 moving upward to evacuate the vacuum port 13, when the sliding guide method of the bushing 231 and the guide shaft 4 is used in the dusty environment corresponding to the vacuum chamber, it is not easily affected by dust. However, the sliding position corresponding to the sliding cooperation of the valve core 2 and the valve body 1 is easily affected by dust and gets stuck.

[0049] In other words, the preferred method is to use a sliding guide with bushing 231 and guide shaft 4, which is suitable not only for clean environments but also for dusty environments.

[0050] In addition, a guide groove 232 is provided in the guide section 23, and the bushing 231 is coaxially inserted in the guide groove 232. When the valve core 2 seals the air inlet 12, in the first direction, the distance between the guide shaft 4 and the guide groove 232 is less than the distance between the end of the valve body 1 away from the vacuum port 13 and the valve core 2.

[0051] It is easy to understand that when the valve core 2 seals the air inlet 12, in the first direction, the distance between the guide shaft 4 and the guide groove 232 is less than the distance between the end of the valve body 1 away from the vacuum port 13 and the valve core 2. This allows the bottom of the guide groove 232 to contact the guide shaft 4 first during the upward movement of the valve core 2, thereby limiting the valve core 2 and avoiding the problem of the valve core 2 contacting the top of the valve body 1 (i.e., the valve cover 15) during the upward movement. This also avoids the problem of the valve core 2 colliding with the valve body 1.

[0052] For example, the end of the guide portion 23 facing the sealing portion 22 is tapered, and the diameter of the tapered shape gradually decreases along the direction away from the sealing portion 22. This tapered shape allows the guide portion 23 and the sealing portion 22 to have greater connection strength, avoids stress concentration, prevents damage to the valve core 2 during long-term up-and-down movement, and extends the service life of the valve core 2.

[0053] In this embodiment, a first sealing gasket 16 is provided circumferentially at the connection between the air inlet 12 and the cavity 11, and a second sealing gasket 24 is provided on the valve core 2. The first sealing gasket 16 and the second sealing gasket 24 are arranged parallel to each other. The close fit between the first sealing gasket 16 and the second sealing gasket 24 can seal the air inlet 12 when the valve core 2 is closed, thereby avoiding leakage caused by the air inlet 12 connecting with the vacuum port 13 or the cavity 11, and facilitating the maintenance of the vacuum environment in the vacuum chamber.

[0054] For example, the second sealing gasket 24 is a single piece structure, which has a large sealing area when it mates with the first sealing gasket 16, resulting in a better sealing effect. Correspondingly, the air inlet 12 and the vacuum port 13 are both located below the cavity 11.

[0055] See also Figure 1 and Figure 2 The valve body 1 includes a valve housing 14 and a valve cover 15. The valve cover 15 is disposed on the valve housing 14. The valve cover 15 and the upper part of the valve housing 14 form a cavity 11. The air inlet 12 and the vacuum port 13 are located in the lower part of the valve housing 14.

[0056] The valve housing 14 and valve cover 15 are designed to facilitate the machining of the cavity 11 and the installation of the valve core 2, meaning that the valve core 2 can be easily inserted after the valve cover 15 is opened.

[0057] For example, a plurality of connecting bolts are inserted into the valve cover 15, and the plurality of connecting bolts are arranged at intervals along the circumference of the valve cover 15 to connect the valve housing 14. The guide shaft 4 is vertically fixed to the valve cover 15.

[0058] In addition, the end of the valve body 14 facing away from the valve cover 15 is provided with an outer flange 141, which has a plurality of spaced connection holes. The valve body 1 is installed and fixed on the carrier by inserting bolts into the connection holes.

[0059] For example, the outer flange 141 can be stepped, which provides greater structural strength.

[0060] Those skilled in the art will readily understand that the above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A vacuum check valve mechanism characterized by, The vacuum check valve mechanism includes a valve body and a valve core; The upper part of the valve body forms a hollow cavity, and the lower part of the valve body has an air inlet and a vacuum port. The valve core is disposed in the cavity and can slide up and down relative to the valve body along the first direction. The valve core connects the air inlet and the vacuum port to the cavity or seals the air inlet. An elastic element is provided between the end of the valve body away from the vacuum port and the valve core. The valve core is provided with an exhaust hole that penetrates the valve core along the first direction. When the valve core moves in the first direction toward the end of the valve body away from the vacuum port, the cavity is connected to the air inlet and the vacuum port respectively. At this time, the elastic element is in the first state. When the elastic element resets, the valve core moves in the first direction toward the end of the valve body near the vacuum port to seal the air inlet. At this time, the cavity is connected to the vacuum port through the exhaust hole.

2. A vacuum check valve mechanism according to claim 1, wherein The vacuum check valve mechanism further includes a guide shaft, the axial direction of which is arranged along a first direction. One end of the guide shaft is fixed to the end of the valve body away from the vacuum port, and the valve core is slidably sleeved on the guide shaft.

3. A vacuum check valve mechanism according to claim 2, wherein The valve core includes a sealing part and a guide part connected to each other. The vent hole passes through the sealing part. The guide part is located in the middle of the sealing part, and one end of the guide part is movably inserted into the vacuum port. A bushing is inserted into the guide part. The guide shaft is movably inserted into the bushing. The elastic element is sleeved on the guide shaft between the bushing and the end of the valve body away from the vacuum port.

4. A vacuum check valve mechanism according to claim 3, wherein The guide section is provided with a guide groove, and the bushing is coaxially inserted into the guide groove. When the valve core seals the air inlet, in the first direction, the distance between the guide shaft and the guide groove is less than the distance between the end of the valve body away from the vacuum port and the valve core.

5. A vacuum check valve mechanism according to claim 3, characterized in that, The guide portion has a conical shape at one end facing the sealing portion, and the diameter of the conical shape gradually decreases along the direction away from the sealing portion.

6. A vacuum check valve mechanism according to claim 1, characterized in that, The valve body includes a valve shell and a valve cover. The valve cover is disposed on the valve shell, and the upper part of the valve cover and the valve shell forms the cavity. The air inlet and the vacuum port are located in the lower part of the valve shell.

7. A vacuum check valve mechanism according to claim 6, characterized in that, The valve housing has an outer flange at the end facing away from the valve cover, and the outer flange has a plurality of spaced connection holes.

8. A vacuum check valve mechanism according to any one of claims 1-7, characterized in that, A first sealing gasket is provided circumferentially at the connection between the air inlet and the cavity, and a second sealing gasket is provided on the valve core. The first sealing gasket and the second sealing gasket are arranged in parallel relative to each other.

9. A vacuum check valve mechanism according to claim 1, characterized in that, The outer peripheral wall of the valve core slides in fit with the inner peripheral wall of the valve body.

10. A vacuum check valve mechanism according to claim 1, characterized in that, The number of air inlets is multiple, and the multiple air inlets are arranged at intervals along the circumference of the cavity.

Images