Positive and negative pressure valve

Abstract

The utility model discloses a positive and negative pressure valve, and belongs to the technical field of valves. The valve mainly comprises a valve body; the vacuum prevention assembly is mounted at the lower end of the valve body; the automatic exhaust assembly is installed at the upper end of the valve body, the automatic exhaust assembly is provided with a fixing plate, and the automatic exhaust assembly comprises a pin shaft installed at the upper end of the fixing plate; the lever is hinged with the pin shaft; the heavy hammer is mounted at the upper end of the lever; and the piston is hinged with the lever. According to the positive and negative pressure valve, gravity compression is achieved by arranging the automatic exhaust assembly, and the effect of avoiding the problem of sealing leakage caused by possible failure of the spring under continuous use is achieved.

Description

Technical Field

[0001] This application relates to the technical field of valves, specifically a positive and negative pressure valve. Background Art

[0002] A positive and negative pressure valve is a special safety valve designed to automatically regulate and control pressure in a pipeline system to ensure the safe operation of the system under both positive and negative pressure conditions. When the internal pressure of the pipeline system exceeds the set value, the positive and negative pressure valve will automatically open to release the excess pressure. When the internal pressure of the system is lower than the set value, the valve will remain closed to prevent external media from entering the system. The positive and negative pressure valve can play a protective role in the positive and negative pressure changes.

[0003] The positive and negative pressure valve is mainly used for the pressure protection of pressure vessels to prevent the pressure in the storage tank from exceeding the design value under abnormal conditions, resulting in deformation, leakage, or even explosion, playing a safety protection role, being able to balance the pressure in the pressure vessel, and at the same time taking into account convenient installation and space saving;

[0004] The existing method for balancing the pressure in a pressure vessel consists of a vacuum prevention valve (for handling negative pressure) and an automatic exhaust valve (for handling positive pressure). The on-site assembly is troublesome, and at the same time, a relatively large installation space is required. Also, the vacuum prevention valve controls the negative pressure opening pressure by spring compression. During use, the spring may fail under continuous use, resulting in the problem of seal leakage, thus affecting subsequent operations.

[0005] Therefore, it is necessary to provide a positive and negative pressure valve to solve the above problems.

[0006] It should be noted that the above information disclosed in this background art section is only used to understand the background art of the concept of this application, and therefore, it may include information that does not constitute prior art. Summary of the Invention

[0007] Based on the above problems existing in the prior art, the problem to be solved by this application is: to provide a positive and negative pressure valve, which solves the problem that the spring may fail under continuous use, resulting in seal leakage, thus affecting subsequent operations.

[0008] The technical solution adopted by this application to solve its technical problems is: a positive and negative pressure valve, comprising:

[0009] A valve body;

[0010] A vacuum prevention assembly, which is installed at the lower end of the valve body, and the vacuum prevention assembly is used to prevent excessive negative pressure inside the valve body;

[0011] Automatic exhaust assembly, which is installed at the upper end of the valve body. The automatic exhaust assembly is used to prevent excessive positive pressure inside the valve body. The automatic exhaust assembly has a fixed plate, and the automatic exhaust assembly includes:

[0012] A pin shaft, which is installed at the upper end of the fixed plate;

[0013] A lever, which is hinged to the pin shaft;

[0014] A weight, which is installed at the upper end of the lever;

[0015] A piston, which is hinged to the lever.

[0016] Furthermore, an intake pipe is fixedly arranged on one side of the valve body, and an interface is fixedly arranged at the end of the intake pipe.

[0017] Furthermore, the vacuum prevention assembly includes a negative pressure channel fixedly arranged at the lower end of the valve body. A vacuum valve core is slidably arranged inside the negative pressure channel. A valve cover pin shaft is fixedly arranged at the upper end of the vacuum valve core. A first sealing ring is fixedly arranged at the connection between the valve cover pin shaft and the valve body. The outer diameter of the vacuum valve core is smaller than the diameter of the negative pressure channel.

[0018] Furthermore, connecting rods are fixedly arranged around the outside of the negative pressure channel, and a base is fixedly connected to the lower end of the connecting rods.

[0019] Furthermore, a connecting ring is arranged at the upper end of the valve body. A clamp is sleeved at the connection between the connecting ring and the valve body. A second sealing ring is fixedly arranged at the connection between the connecting ring and the valve body.

[0020] Furthermore, a bracket is fixedly arranged at one end of the fixed plate away from the pin shaft. The bracket includes two groups of support columns fixedly arranged at the upper end of the fixed plate, and a stop block is fixedly arranged at the uppermost end of the bracket.

[0021] The beneficial effect of this application is that the positive and negative pressure valve provided by this application realizes gravity compression by setting an automatic exhaust assembly, achieving the effect of avoiding the problem that the spring may fail under continuous use, resulting in seal leakage.

[0022] In addition to the purposes, features and advantages described above, this application has other purposes, features and advantages. The following will refer to the drawings to further elaborate on this application in detail. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The specification drawings forming a part of this application are used to provide a further understanding of this application. The schematic embodiments of this application and their descriptions are used to explain this application and do not constitute an improper limitation to this application. In the drawings:

[0024] Figure 1 This is the overall schematic diagram of the positive and negative pressure valve in this application;

[0025] Figure 2 is Figure 1 the schematic diagram of the vacuum prevention component in;

[0026] Figure 3 is Figure 1 the schematic diagram of the automatic exhaust component in;

[0027] Among them, each reference numeral in the figure:

[0028] 1. Valve body; 2. Vacuum prevention component; 3. Automatic exhaust component; 4. Interface; 5. Intake pipeline; 21. Base; 22. Vacuum valve core; 23. First sealing ring; 24. Valve cover pin shaft; 26. Clamp; 27. Connecting ring; 31. Fixed plate; 32. Weight; 33. Piston; 34. Pin shaft; 35. Bracket; 36. Cover plate; 37. Lever; 28. Negative pressure channel; 29. Second sealing ring. Detailed implementation manners

[0029] It should be noted that, without conflict, the embodiments in this application and the features in the embodiments can be combined with each other. The following will describe this application in detail with reference to the drawings and in combination with the embodiments.

[0030] In order to enable those skilled in the art to better understand the solution of this application, the following will clearly and completely describe the technical solutions in the embodiments of this application with reference to the drawings in the embodiments of this application. Obviously, the described embodiments are only a part of the embodiments of this application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of this application.

[0031] As Figure 1 - Figure 2 shown, this application provides a positive and negative pressure valve, including a valve body 1, and an intake pipeline 5 fixedly arranged on one side of the valve body 1. The intake pipeline 5 is suitable for transmitting gas into the valve body 1. At the same time, an interface 4 is fixedly arranged at the end of the intake pipeline 5, and the interface 4 is used to connect with the tank body;

[0032] A vacuum prevention component 2 is fixedly arranged at the lower end of the valve body 1. The vacuum prevention component 2 is suitable for preventing excessive negative pressure inside the tank body, and the vacuum prevention component 2 is communicated with the valve body 1;

[0033] The vacuum prevention component 2 includes a negative pressure channel 28 fixedly arranged at the lower end of the valve body 1. A vacuum valve core 22 is slidably arranged inside the negative pressure channel 28, and the vacuum valve core 22 controls the gas flow channel by sliding in the negative pressure channel 28;

[0034] Meanwhile, a valve cover pin shaft 24 is fixedly arranged at the upper end of the vacuum valve core 22, and the diameter of the valve cover pin shaft 24 is larger than that of the negative pressure channel 28. The valve cover pin shaft 24 is suitable for preventing the vacuum valve core 22 from displacing under high pressure or vibration environment, ensuring the normal operation of the valve. At the same time, the valve cover pin shaft 24 is arranged at the inner bottom end of the valve body 1 and is located at the upper end of the negative pressure channel 28. A first sealing ring 23 is fixedly arranged at the connection between the valve cover pin shaft 24 and the valve body 1 to ensure its sealing performance. Thus, in the initial state, under the gravity of the vacuum valve core 22 and the valve cover pin shaft 24, the bottom surface of the valve cover pin shaft 24 fits on the first sealing ring 23 and seals the negative pressure channel 28;

[0035] Moreover, the outer diameter of the vacuum valve core 22 is smaller than the diameter of the negative pressure channel 28, and it is slidably arranged at the connection between the negative pressure channel 28 and the valve body 1. At the same time, the weight of the vacuum valve core 22 is designed such that when the negative pressure in the tank exceeds the set pressure, the negative pressure applies an upward suction pressure value;

[0036] When the negative pressure in the tank exceeds the set pressure, the vacuum valve core 22 will be subjected to an upward suction force by the negative pressure, so that the vacuum valve core 22 slides upward until the valve cover pin shaft 24 disengages from the first sealing ring 23, and then air pressure is supplemented into the valve to balance the pressure in the tank;

[0037] Meanwhile, a connecting rod (not marked in the figure) is fixedly arranged around the outer periphery of the negative pressure channel 28. The lower end of the connecting rod is fixedly connected with a base 21, and the base 21 is a water collecting tray. When the vacuum valve leaks or is forcibly opened for cleaning, the liquid drains out from the small holes beside the base 21.

[0038] Such as Figure 2 and Figure 3 shown, a connecting ring 27 is arranged at the upper end of the valve body 1. At the same time, a clamp 26 is sleeved at the connection between the connecting ring 27 and the valve body 1. The clamp 26 is suitable for fixing the connecting ring 27 and the valve body 1, and a second sealing ring 29 is fixedly arranged at the connection between the connecting ring 27 and the valve body 1 to ensure the airtightness of the valve body 1;

[0039] Meanwhile, an automatic exhaust assembly 3 is fixedly arranged at the upper end of the connecting ring 27. The automatic exhaust assembly 3 is suitable for preventing excessive positive pressure inside the tank;

[0040] The automatic exhaust assembly 3 includes a fixing plate 31 fixedly arranged at the upper end of the connecting ring 27. At the same time, a pin shaft 34 is fixedly arranged at one end of the fixing plate 31, and a lever 37 is hinged on the pin shaft 34. The lever 37 is suitable for triggering the operation of the automatic exhaust assembly 3;

[0041] Meanwhile, a weight 32 is fixedly arranged at the front end position of the lever 37. The weight 32 is suitable for providing a stable power source for the lever 37 to trigger the operation of the automatic exhaust assembly 3;

[0042] A cover plate 36 is fixedly arranged at the upper end of the fixing plate 31. A piston 33 is fixedly arranged at the upper end of the cover plate 36. The piston 33 is hinged to a lever 37. The piston 33 is adapted to control the gas flow.

[0043] A bracket 35 is fixedly arranged at one end of the fixing plate 31 far from the pin shaft 34. The bracket 35 includes two groups of support columns (not marked in the figure) fixedly arranged at the upper end of the fixing plate 31. The lever 37 is hinged between the two groups of support columns. A stop block (not marked in the figure) is fixedly arranged at the uppermost ends of the two groups of support columns, which is adapted to control the lifting angle of the lever 37.

[0044] It should be noted that when the positive pressure inside the valve exceeds the self - gravity of the weight 32, an upward pressure will be applied to push the lever 37 through the piston 33 to open the valve and discharge the excess pressure to balance the pressure in the tank.

[0045] When the positive - negative pressure valve starts to operate, when the positive pressure in the tank exceeds the set pressure, the vacuum valve core 22 will be pressed downward by the positive pressure to tightly seal. The upper - half automatic exhaust assembly 3 is sealed by gravity. When the positive pressure inside the valve exceeds the self - gravity of the weight 32, an upward pressure will be applied to push the lever 37 through the piston 33 to open the valve and discharge the excess pressure to balance the pressure in the tank.

[0046] When the negative pressure in the tank exceeds the set pressure, the upper - half automatic exhaust assembly 3 is sealed by gravity and will be sucked downward under the influence of the negative pressure, and the seal will be tightened more. The vacuum valve core 22 will be sucked upward by the negative pressure, so that the vacuum valve core 22 slides upward, opens the seal through the valve cover pin shaft 24, and then supplements the air pressure into the valve to balance the pressure in the tank.

[0047] The above are only the preferred embodiments of the present application and are not used to limit the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. Positive and negative pressure valve, characterized by: include: Valve body (1); A vacuum prevention component (2), the vacuum prevention component (2) being mounted at the lower end of the valve body (1), the vacuum prevention component (2) being used to prevent excessive negative pressure from occurring inside the valve body (1); An automatic exhaust component (3), the automatic exhaust component (3) being mounted on the upper end of the valve body (1), the automatic exhaust component (3) being used to prevent excessive positive pressure from occurring inside the valve body (1), the automatic exhaust component (3) having a fixing plate (31), and comprising: A pin shaft (34) mounted on the upper end of the fixing plate (31); A lever (37), the lever (37) being hingedly connected to the pin (34); A weight (32) mounted on the upper end of the lever (37); A piston (33) is hingedly connected to the lever (37).

2. The positive and negative pressure valve according to claim 1, characterized in that: An air intake pipe (5) is fixedly provided on one side of the valve body (1), and an interface (4) is fixedly provided on the end of the air intake pipe (5).

3. The positive and negative pressure valve according to claim 1, characterized in that: The vacuum prevention component (2) comprises a negative pressure channel (28) fixedly arranged at the lower end of the valve body (1), a vacuum valve core (22) being slidably arranged inside the negative pressure channel (28), a valve cover pin shaft (24) being fixedly arranged at the upper end of the vacuum valve core (22), a first sealing ring (23) being fixedly arranged at the connection between the valve cover pin shaft (24) and the valve body (1), and an outer diameter of the vacuum valve core (22) being smaller than a diameter of the negative pressure channel (28).

4. The positive and negative pressure valve according to claim 3, characterized in that: Connecting rods are fixedly arranged around the outside of the negative pressure channel (28), and the lower ends of the connecting rods are fixedly connected to a base (21).

5. The positive and negative pressure valve according to claim 1, characterized in that: A connecting ring (27) is provided at the upper end of the valve body (1), a clamp (26) is sleeved at the connection between the connecting ring (27) and the valve body (1), and a second sealing ring (29) is fixedly provided at the connection between the connecting ring (27) and the valve body (1).

6. The positive and negative pressure valve according to claim 1, characterized in that: A bracket (35) is fixedly provided on one end of the fixing plate (31) away from the pin shaft (34), the bracket (35) comprising two groups of support columns fixedly provided on the upper end of the fixing plate (31), and a stopper is fixedly provided on the uppermost end of the bracket (35).

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