High vacuum negative pressure valve

Abstract

The utility model discloses a high-vacuum negative-pressure valve which comprises a ventilation cylinder, a plurality of ventilation holes which are evenly distributed are formed in the ventilation cylinder, and first fixing plates are fixedly connected to the two sides of the ventilation cylinder. The sealing plates are arranged on the periphery of the ventilation cylinder, are attached to the ventilation cylinder and are used for covering the ventilation holes; the fixing devices are uniformly distributed on the fixing plate I and are used for fixing the sealing plate outside the air hole; the connecting cylinder is arranged below the ventilating cylinder, and the connecting cylinder and the ventilating cylinder are connected through a plurality of uniformly distributed connecting devices; the valve rod is arranged in the ventilation cylinder, the lower end of the valve rod is in threaded connection with a horn-shaped valve element, a valve plate matched with the valve element is arranged on the periphery of the valve element, and a valve port attached to the periphery of the valve element is formed in the middle of the valve plate. The inner wall is convenient to clean.

Description

Technical Field

[0001] The utility model relates to the technical field of negative pressure valves, in particular to a high vacuum negative pressure valve. Background Art

[0002] Vacuum negative pressure safety valves are used in sealed vacuum containers. When the pressure inside the container falls below the set value, the valve opens, replenishing pressure to the container, ensuring that the pressure inside the container does not fall below the set value. This prevents the container from being damaged by excessively low pressure. Vacuum negative pressure safety valves are divided into two categories: spring-loaded and rod-type. There are also impulse-type safety valves, pilot-operated safety valves, safety switching valves, safety pressure relief valves, and static weight-type safety valves.

[0003] The utility model patent with publication number CN218177949U discloses a vacuum negative pressure safety valve. The key points of its technical solution are that it includes a valve body, a valve seat positioned on the valve body, a valve cover positioned on the valve body, a valve disc located in the valve body, a valve stem penetrating the valve seat and connected to the valve disc, a spring seat sleeved outside the valve stem and a spring limited between the spring seat and the valve seat, the valve seat is provided with an air inlet hole penetrating therethrough, the valve cover is provided with a plurality of vent holes, a locking nut is screwed on the end portion of the valve stem located outside the valve seat to limit the movement of the spring seat, and the valve cover also includes a limiting sleeve sleeved outside the valve stem, the limiting sleeve is limited between the spring seat and the valve seat, the limiting sleeve is located in the inner cavity of the spring, and the spring is compressed into place by the contact between the spring seat and the limiting sleeve, thereby solving the problems of easy damage of the spring and easy leakage of the medium in the prior art.

[0004] The prior art still has some problems: 1. The device cannot conveniently change the size of the ventilation rate during use, which may easily cause insufficient ventilation or excessive ventilation when different objects pass by.

[0005] 2. After long-term use, the inner wall of the device will be contaminated and dirt will be attached. The holes of the filter will also be clogged, which will affect the ventilation efficiency. However, due to the connection method of bolts and studs, it is difficult to disassemble and it is not convenient to clean the inner wall and filter. Utility Model Content

[0006] The technical problem to be solved by the utility model is to overcome the above-mentioned defects and provide a high vacuum negative pressure valve.

[0007] In order to solve the above technical problems, the technical solutions provided by the present invention are as follows:

[0008] High vacuum negative pressure valve, including:

[0009] A ventilation cylinder, wherein a plurality of evenly distributed ventilation holes are opened on the ventilation cylinder, and a fixing plate 1 is fixedly connected to both sides of the ventilation cylinder;

[0010] A plurality of sealing plates, the sealing plates being arranged on the outer periphery of the vent tube and being in contact with the vent tube, and the sealing plates being used to cover the vent holes;

[0011] A plurality of fixing devices, each of which is evenly arranged on the fixing plate 1 and is used to fix the sealing plate to the outside of the vent hole;

[0012] A connecting cylinder is provided below the venting cylinder, and the connecting cylinder and the venting cylinder are connected by a plurality of evenly distributed connecting devices;

[0013] The valve stem is arranged in the air-permeable cylinder, and the upper and lower ends of the valve stem are provided with threaded parts. The lower end of the inner wall of the air-permeable cylinder is threadedly connected to a breathable plate with holes. The lower end of the valve stem passes through the breathable plate and extends into the connecting cylinder. The valve stem is slidably connected to the middle part of the breathable plate. The lower end of the valve stem is threadedly connected to a trumpet-shaped valve core. The outer periphery of the valve core is provided with a valve plate that cooperates with it. The middle part of the valve plate is provided with a valve port that fits the outer periphery of the valve core. The valve plate is fixedly connected to the inner wall of the connecting cylinder.

[0014] As an improvement, a filter screen is provided on the inner wall of the air cylinder.

[0015] As an improvement, a spring 1 is provided on the outer periphery of the valve stem, and the upper end of the valve stem is threadedly connected to a limiting nut.

[0016] As an improvement, the sealing plates at the front and rear ends are fixedly connected to the surfaces close to each other with a number of flexible sealing plugs used in conjunction with the air vents, and two upper and lower parallel fixing columns are fixedly connected to both sides of the sealing plates.

[0017] As an improvement, the fixing device includes a cavity one, which is opened on a fixing plate one. The fixing plates on both sides have threaded holes at ends away from each other, and bolts are threadedly connected in the threaded holes. The bolts on both sides extend into the cavity one at ends close to each other and are provided with trapezoidal blocks.

[0018] As an improvement, wedge blocks are provided at the upper and lower ends of the trapezoidal block, and the wedge blocks and the trapezoidal blocks form a push, and the ends of the wedge blocks away from each other are fixedly connected with clamping rods, and the inner walls of the upper and lower ends of cavity one are fixedly connected with fixed plate two, and cavity one is provided with cavity two opened on fixed plate one at the upper and lower parts, and the ends of the clamping rods at the upper and lower ends away from each other pass through fixed plate two and extend into cavity two, and the ends of the clamping rods at the upper and lower ends away from each other are U-shaped.

[0019] As an improvement, a second spring is provided on the outer periphery of the clamping rod.

[0020] As an improvement, the connecting device includes a threaded rod 1, a threaded rod 2 is arranged below the threaded rod 1, the threaded rod 1 and the threaded rod 2 are respectively rotatably connected to the breathable tube and the connecting tube, the outer periphery of the contact part of the threaded rod 1 and the threaded rod 2 are commonly threadedly connected with a threaded sleeve, and the threads of the threaded rod 1 and the threaded rod 2 are opposite.

[0021] As an improvement, a sealing ring is provided between the venting tube and the connecting tube.

[0022] The advantages of the present invention compared with the prior art are: 1. When the ventilation rate needs to be adjusted, it is only necessary to install different numbers of sealing plates. The fixing device can quickly disassemble and fix the sealing plates, which is more practical.

[0023] 2. When you need to clean the inner wall of the breather tube and the connecting tube, or the internal components, you only need to screw the threaded sleeve to move it up or down until the threaded sleeve is completely separated from the threaded connection of the threaded rod 1 or the threaded rod 2. This will complete the separation of the breather tube and the connecting tube. It is simple and quick, and the sealing ring can ensure the sealing. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a three-dimensional schematic diagram of the utility model Figure 1 ;

[0025] Figure 2 It is a cross-sectional schematic diagram of the utility model;

[0026] Figure 3 It is a three-dimensional schematic diagram of the sealing plate of the utility model;

[0027] Figure 4 It is an enlarged schematic diagram of the utility model A;

[0028] Figure 5 It is an enlarged schematic diagram of the utility model B;

[0029] As shown in the figure: 1. Breathing tube; 2. Breathing hole; 3. Fixing plate 1; 4. Sealing plate; 5. Fixing device; 6. Connecting tube; 7. Connecting device; 8. Valve stem; 9. Breathing plate; 10. Valve core; 11. Valve plate; 12. Valve port; 13. Filter screen; 14. Spring 1; 15. Limit nut; 16. Flexible sealing plug; 17. Fixing column; 18. Cavity 1; 19. Threaded hole; 20. Bolt; 21. Trapezoidal block; 22. Wedge block; 23. Clamping rod; 24. Fixing plate 2; 25. Cavity 2; 26. Spring 2; 27. Threaded rod 1; 28. Threaded rod 2; 29. Threaded sleeve; 30. Sealing ring. DETAILED DESCRIPTION

[0030] The present invention will be described in further detail below with reference to the accompanying drawings.

[0031] Combined with attachment Figures 1 to 5 The high vacuum negative pressure valve mainly includes: a ventilation tube 1, a plurality of sealing plates 4, a plurality of fixing devices 5, a connecting tube 6, and a valve stem 8. Among them, the ventilation tube 1 is provided with a plurality of evenly distributed ventilation holes 2, and a fixing plate 3 is fixedly connected on both sides of the ventilation tube 1. The sealing plate 4 is arranged on the outer periphery of the ventilation tube 1 and fits with it. The sealing plate 4 is used to cover the ventilation holes 2. By changing the number of sealing plates 4 installed, the size of the ventilation rate can be changed. The ventilation holes 2 are used for ventilation and adjusting the air pressure. The front and rear end sealing plates 4 are fixedly connected to the surfaces close to each other with a plurality of flexible sealing plugs 16 used to cooperate with the ventilation holes 2. The flexible sealing plugs 16 can completely block the ventilation holes 2 to achieve sealing. Two upper and lower parallel fixing columns 17 are fixedly connected on both sides of the sealing plate 4. The fixing devices 5 are evenly arranged on the fixing plate 3. The fixing devices 5 are used to fix the sealing plate 4 to the outside of the ventilation holes 2. The connecting tube 6 is arranged below the ventilation tube 1. The connecting tube 6 and the ventilation tube 1 are connected by a plurality of evenly distributed connecting devices 7.

[0032] Then, the valve stem 8 is arranged in the air cylinder 1, and the upper and lower ends of the valve stem 8 are provided with threaded parts. The lower end of the inner wall of the air cylinder 1 is threadedly connected with a breathable plate 9 with holes. The breathable plate 9 can limit the spring 14. At the same time, the holes on the breathable plate 9 can allow air to pass through. The lower end of the valve stem 8 passes through the breathable plate 9 and extends into the connecting cylinder 6. The valve stem 8 is slidably connected to the middle of the breathable plate 9. The lower end of the valve stem 8 is threadedly connected with a trumpet-shaped valve core 10. The outer periphery of the valve core 10 is provided with a valve plate 11 that matches it. The middle part of the valve plate 11 is provided with a valve port 12 that fits the outer periphery of the valve core 10. The valve plate 11 is fixedly connected to the inner wall of the connecting cylinder 6. The inner wall of the air cylinder 1 is provided with a filter screen 13. The filter screen 13 can effectively prevent dust and flying insects from entering the interior of the air cylinder 1 to avoid contaminating internal components. A spring 14 is provided on the outer periphery of the valve stem 8, and the upper end of the valve stem 8 is threadedly connected to a limiting nut 15.

[0033] When the device is running as a whole, there is a pressure difference between the upper and lower ends of the valve plate 11, the valve stem 8 and the valve core 10 move downward, the valve core 10 leaves the range of the valve port 12, and then the upper and lower ends of the valve plate 11 are connected, the spring 14 is compressed by the breathable plate 9 and the limit nut 15, and then the outside air is sucked in through the breathable hole 2. When the internal and external pressures are balanced, the spring 14 rebounds, the valve core 10 and the valve stem 8 are reset, and then the valve core 10 seals the valve port 12.

[0034] When the ventilation rate needs to be adjusted, it is only necessary to install different numbers of sealing plates 4. After long-term use, the sealing plates 4 are installed and removed. In order to achieve quick disassembly and fixation of the sealing plates 4, specifically, the fixing device 5 includes a cavity 18. The cavity 18 is opened on the fixing plate 3. The fixing plates 3 on both sides are provided with threaded holes 19 at the ends away from each other. The threaded holes 19 are connected with bolts 20 in the threaded holes. The bolts 20 on both sides extend into the cavity 18 at the ends close to each other and are provided with trapezoidal blocks 21. The trapezoidal blocks Wedge blocks 22 are provided at the upper and lower ends of 21, and the wedge blocks 22 and the trapezoidal blocks 21 form a push. The ends of the wedge blocks 22 away from each other are fixedly connected to clamping rods 23, and the inner walls of the upper and lower ends of cavity 18 are fixedly connected to fixed plates 24. Cavity 18 is provided with cavity 25 opened on fixed plate 3 at the upper and lower sides. The ends of the upper and lower clamping rods 23 away from each other pass through fixed plate 24 and extend into cavity 25. The ends of the upper and lower clamping rods 23 away from each other are U-shaped, and a spring 26 is provided on the outer periphery of the clamping rod 23.

[0035] When it is necessary to fix the sealing plate 4, the sealing plate 4 is pressed to cover the air vent 2. The sealing plate 4 has a certain elastic deformation, so that the fixing columns 17 on both sides can enter the cavity 2 25 at the same time, and then the bolt 20 is screwed in the direction close to the cavity 1 18. The trapezoidal block 21 pushes the wedge blocks 22 at the upper and lower ends to move away from each other, and then the U-shaped part of the clamping rod 23 clamps the fixing column 17. At this time, the spring 26 is stretched. Then, when it is necessary to disassemble, the bolt 20 is screwed in the opposite direction to move away from the cavity 18. The trapezoidal block 21 does not form a push with the wedge block 22, and the limit on the fixing column 17 can be released. Then the spring 26 rebounds, and the wedge block 22 and the clamping rod 23 are reset, which is convenient for the next installation. It is convenient and quick.

[0036] Finally, the connecting device 7 includes a threaded rod 27, a threaded rod 28 is provided below the threaded rod 27, the threaded rod 27 and the threaded rod 28 are respectively rotatably connected to the breathable cylinder 1 and the connecting cylinder 6, the outer periphery of the contact portion of the threaded rod 27 and the threaded rod 28 are commonly threadedly connected with a threaded sleeve 29, the threads of the threaded rod 27 and the threaded rod 28 are opposite, and a sealing ring 30 is provided between the breathable cylinder 1 and the connecting cylinder 6 to prevent air leakage. When disassembly is required, only the threaded sleeve 29 needs to be screwed to move it up or down. Move until the threaded sleeve 29 is completely disengaged from the threaded connection of the threaded rod 1 27 or the threaded rod 28, so as to complete the connection between the breathable cylinder 1 and the connecting cylinder 6, and facilitate the cleaning of the inner wall of the breathable cylinder 1 and the connecting cylinder 6 and the filter 13 to prevent the ventilation efficiency from being affected. When it is necessary to connect the breathable cylinder 1 and the connecting cylinder 6, the threaded rod 1 27 and the threaded rod 28 are aligned and on the same straight line, and then the threaded sleeve 29 is screwed so that the threaded rod 1 27 and the threaded rod 28 are both accommodated and connected by the threaded sleeve 29 to complete the connection.

[0037] The information disclosed in this background section is only intended to enhance understanding of the overall background of the invention and should not be considered as an admission or any form of suggestion that the information constitutes the prior art already known to a person skilled in the art.

[0038] The above description of the present invention and its embodiments is non-limiting. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. In short, if a person skilled in the art is inspired by the above, and does not deviate from the purpose of the present invention, without inventive design, a structure and embodiment similar to the technical solution should fall within the scope of protection of the present invention.

Claims

1. High vacuum negative pressure valve, characterized in that, include: A ventilation cylinder (1), wherein a plurality of evenly distributed ventilation holes (2) are provided on the ventilation cylinder (1), and a fixing plate (3) is fixedly connected to both sides of the ventilation cylinder (1); A plurality of sealing plates (4), the sealing plates (4) being arranged on the outer periphery of the vent tube (1) and being in contact with the vent tube (1), the sealing plates (4) being used to cover the vent holes (2); A plurality of fixing devices (5), wherein the fixing devices (5) are evenly arranged on the fixing plate (3), and the fixing devices (5) are used to fix the sealing plate (4) to the outside of the vent hole (2); A connecting cylinder (6), the connecting cylinder (6) being arranged below the vent cylinder (1), the connecting cylinder (6) and the vent cylinder (1) being connected via a plurality of evenly distributed connecting devices (7); A valve stem (8), the valve stem (8) is arranged in the air-permeable cylinder (1), the upper and lower ends of the valve stem (8) are provided with threaded parts, the lower end of the inner wall of the air-permeable cylinder (1) is threadedly connected to a breathable plate (9) with a plurality of holes, the lower end of the valve stem (8) passes through the breathable plate (9) and extends into the connecting cylinder (6), the valve stem (8) is slidably connected to the middle of the breathable plate (9), the lower end of the valve stem (8) is threadedly connected to a trumpet-shaped valve core (10), the outer periphery of the valve core (10) is provided with a valve plate (11) matched therewith, the middle part of the valve plate (11) is provided with a valve port (12) that fits the outer periphery of the valve core (10), and the valve plate (11) is fixedly connected to the inner wall of the connecting cylinder (6).

2. The high vacuum negative pressure valve according to claim 1, characterized in that: The inner wall of the vent cylinder (1) is provided with a filter screen (13).

3. The high vacuum negative pressure valve according to claim 1, characterized in that: A spring (14) is provided on the outer periphery of the valve stem (8), and the upper end of the valve stem (8) is threadedly connected to a limiting nut (15).

4. The high vacuum negative pressure valve according to claim 1, characterized in that: The front and rear end sealing plates (4) are fixedly connected to the mutually adjacent surfaces thereof with a plurality of flexible sealing plugs (16) used in conjunction with the vent holes (2), and both sides of the sealing plate (4) are fixedly connected to two upper and lower parallel fixing columns (17).

5. The high vacuum negative pressure valve according to claim 1, characterized in that: The fixing device (5) includes a cavity (18), the cavity (18) is opened on the fixing plate (3), and the fixing plates (3) on both sides have threaded holes (19) at their ends away from each other. Bolts (20) are connected to the threaded holes (19), and the bolts (20) on both sides extend into the cavity (18) at their ends close to each other and are provided with trapezoidal blocks (21).

6. The high vacuum negative pressure valve according to claim 5, characterized in that: The upper and lower ends of the trapezoidal block (21) are both provided with wedge blocks (22), and the wedge blocks (22) and the trapezoidal block (21) form a push, and the ends of the wedge blocks (22) that are away from each other are fixedly connected with clamping rods (23), and the inner walls of the upper and lower ends of the cavity one (18) are both fixedly connected with fixed plate two (24), and the upper and lower sides of the cavity one (18) are both provided with cavity two (25) opened on fixed plate one (3), and the ends of the clamping rods (23) that are away from each other at the upper and lower ends pass through fixed plate two (24) and extend into cavity two (25), and the ends of the clamping rods (23) that are away from each other at the upper and lower ends are both U-shaped.

7. The high vacuum negative pressure valve according to claim 6, characterized in that: A second spring (26) is provided on the outer periphery of the clamping rod (23).

8. The high vacuum negative pressure valve according to claim 1, characterized in that: The connecting device (7) comprises a threaded rod (27), a threaded rod (28) is provided below the threaded rod (27), the threaded rod (27) and the threaded rod (28) are rotatably connected to the vent tube (1) and the connecting tube (6) respectively, the contact parts of the threaded rod (27) and the threaded rod (28) are commonly threadedly connected to a threaded sleeve (29), and the threads of the threaded rod (27) and the threaded rod (28) are opposite.

9. The high vacuum negative pressure valve according to claim 1, characterized in that: A sealing ring (30) is provided between the venting cylinder (1) and the connecting cylinder (6).

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