Automatic exhaust valve

Abstract

The automatic exhaust valve comprises an upper valve seat, a center valve seat and a lower valve seat, a valve element penetrates through the center of the center valve seat, the center valve seat is provided with an air hole, the lower end of the valve element is located in the lower valve seat, and the upper end of the valve element is located in the upper valve seat. The outer diameter of the lower end of the valve element is larger than the maximum distance between the air hole of the center valve seat and the shaft of the center valve seat, a spring is arranged between the lower end of the valve element and the lower end of the center valve seat, and a locking nut is installed on the top of the valve element.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to an automatic exhaust valve. Background Art

[0002] Traditional automatic exhaust valves are usually installed at the highest point and local high point of the system pipeline to remove the air stored in the water pipeline. The working principle of the automatic exhaust valve is to use the buoyancy of water to block the vent. When air is stored at the highest point of the pipeline, the buoyancy of water is reduced or eliminated, the vent is opened, and the air is discharged from the vent under the action of pressurized water. When the air is exhausted, the buoyancy of water acts on the simple mechanical device to block the vent. Unlike the exhaust of the air collecting tank, the automatic exhaust valve does not require manual operation.

[0003] When gas overflows in the system, the gas will climb up along the pipeline and eventually gather at the highest point of the system. The automatic exhaust valve is generally installed at the highest point of the system. When the gas enters the exhaust valve cavity, it gathers at the upper part of the exhaust valve. As the gas in the valve increases, the pressure rises. When the gas pressure is greater than the system pressure, the gas will cause the water level in the cavity to drop, and the float will drop with the water level, opening the exhaust port. After the gas is exhausted, the water level rises, and the float also rises, closing the exhaust port.

[0004] The same principle applies. When negative pressure is generated in the system, the water level in the valve cavity drops and the exhaust port opens. Since the external atmospheric pressure is greater than the system pressure at this time, the atmosphere will enter the system through the exhaust port to prevent the harm of negative pressure.

[0005] The traditional automatic breathing valve is composed of valve body, float, connecting rod, seal and other parts. The valve body is made of specific stainless steel or carbon steel, in which the valve body is connected to the pipeline through flange or thread. The float is generally a hollow stainless steel ball or a hollow plastic ball, and the float is placed in the valve body. The float is connected to the seal through a connecting rod. When the water level rises, the float pushes the seal upward through the connecting rod under the action of buoyancy until the valve exhaust port is sealed. When the gas gathers at the top, it will compress the liquid level to drop, the float drops, and the seal moves downward through the connecting rod, thereby opening the air inlet.

[0006] Traditional automatic breathing valves have the following shortcomings:

[0007] 1. The hollow float can work normally in the low-pressure system, but in the working range where the system pressure is greater than 2.5 MPa, the strength of the hollow ball is not enough, and it is easy to be compressed and deformed or leak under high pressure, resulting in failure of the action.

[0008] 2. The connecting rod between the float and the seal plays the role of transmitting motion. Under the action of pressure, the connecting rod is easy to bend and deform, resulting in the opening and closing action of the seal not being in place, causing the valve to fail.

[0009] 3. The floating ball, connecting rod and other moving mechanisms are closed in the pipeline system for a long time and are in direct contact with the working fluid, which makes them easily corroded and damaged.

[0010] 4. It cannot be flexibly adjusted according to changes in system working conditions. The closing pressure is provided by the buoyancy of the float, which is related to the density of the working medium. When the water quality changes, it will affect the sealing effect of the valve. Utility Model Content

[0011] The utility model provides an automatic exhaust valve which can work at low pressure and high pressure, has reliable operation and can be flexibly adjusted to adapt to different working conditions.

[0012] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0013] The utility model discloses an automatic exhaust valve, comprising an upper valve seat, a central valve seat and a lower valve seat, a valve core passes through the center of the central valve seat, the central valve seat is provided with an air hole, the lower end of the valve core is located in the lower valve seat, the upper end of the valve core is located in the upper valve seat, the outer diameter of the lower end of the valve core is larger than the maximum distance between the air hole of the central valve seat and the axis of the central valve seat, a spring is provided between the lower end of the valve core and the lower end of the central valve seat, and a locking nut is installed on the top of the valve core.

[0014] Preferably, the upper valve seat and the central valve seat are connected by bolts, and the central valve seat and the lower valve seat are connected by a copy forest joint.

[0015] Preferably, the valve core is T-shaped, and the valve core includes a valve core shaft and a valve core plate. The valve core shaft passes through the center valve seat, and the valve core plate is located in the lower valve seat. The outer diameter of the valve core plate is larger than the maximum distance between the air hole of the center valve seat and the axis of the center valve seat.

[0016] Preferably, the upper end of the valve core shaft is provided with an external thread, and two locking nuts are installed on the upper end of the valve core shaft, and the outer diameter of the locking nuts is larger than the center hole of the center valve seat for passing the valve core.

[0017] Preferably, the upper end surface of the valve core plate is provided with a main sealing gasket and a pressure plate in sequence, and the pressure plate, the main sealing gasket and the valve core plate are connected by a plurality of screws.

[0018] Preferably, a avoidance groove is provided at the lower end of the central valve seat, the outer diameter of the avoidance groove is larger than the outer diameter of the pressure plate, the outer diameter of the avoidance groove is smaller than the outer diameter of the sealing gasket, and the outer diameter of the sealing gasket is the same as the outer diameter of the valve core plate.

[0019] Preferably, a rubber sealing pad is provided at the contact point between the upper valve seat and the central valve seat.

[0020] Compared with the prior art, the beneficial effects of the utility model are:

[0021] The utility model uses the principle of fluid mechanics to close the valve, which is different from the principle of traditional valves that use buoyancy to drive the float. It solves the problem that the float is not able to withstand strong pressure. By adjusting the position of the locking nut on the valve core, compressing or releasing the spring to control the closing force and the gap between the valve core and the center valve seat, different working conditions can be adapted. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of an embodiment of the utility model.

[0023] Figure 2 It is a schematic diagram of the valve core of an embodiment of the utility model.

[0024] Figure 3 It is a schematic diagram of the central valve seat in an embodiment of the utility model. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] As shown in the figure, the utility model discloses an automatic exhaust valve, including an upper valve seat 8, a central valve seat 10 and a lower valve seat 12, a valve core 1 passes through the center of the central valve seat 10, the central valve seat 10 is provided with an air hole 101, the lower end of the valve core 1 is located in the lower valve seat 12, the upper end of the valve core 1 is located in the upper valve seat 8, the outer diameter of the lower end of the valve core 1 is greater than the maximum distance between the air hole of the central valve seat and the axis of the central valve seat 10, so that the valve core 1 can seal the air hole 101 of the central valve seat. A spring 4 is provided between the lower end of the valve core 1 and the lower end of the central valve seat 10, and a locking nut 2 is installed on the top of the valve core 1. The spring 4 plays a reset role.

[0027] Exhaust process: The gas first enters the automatic exhaust valve through the lower valve seat 12, and the airflow enters the upper valve seat 8 through the gap between the valve core 1 and the center valve seat 10 and the air hole 101 of the center valve seat, and finally is discharged through the upper valve seat 8. When the water level rises and enters the gap between the valve core 1 and the center valve seat 10, a fluid pressure difference will be formed at the valve core 1, specifically, at the valve core plate 14, and then the valve core 1 is pushed upward to close the sealing surface of the main sealing gasket 7 and the center valve seat 10. The closing of the valve utilizes the Bernoulli principle of the fluid. The pressure is small where the flow rate is large, and the density of water is much greater than that of air, so the pressure difference generated by water is much greater than that of gas, so that the water flow can push the valve core 1, but the air flow cannot push the valve core 1.

[0028] Intake process: When a vacuum is formed inside the system, the valve core 1 forms a gap away from the center valve seat 10 under the action of the spring 4. The external airflow can enter the center valve seat 10 through the upper valve seat 8, and then enter the lower valve seat 12 through the gap between the valve core 1 and the center valve seat 10, thereby entering the system.

[0029] Automatic exhaust when closed: When the gas gathers at the bottom of the valve core 1, the pressure formed by the gas is greater than the system pressure of the working fluid. The valve core forms a gap away from the center valve seat 10 under the action of the spring 4, so that the high-pressure airflow gathered inside enters the upper valve seat 8 through the gap between the valve core 1 and the center valve seat 10 and the air hole 101 at the rear end of the center valve seat, and finally is discharged through the upper valve seat 8. When the airflow is exhausted and the water flows into the gap between the valve core 1 and the center valve seat 10, the generated fluid pressure difference pushes the valve core 1 to close.

[0030] When closed, the lock nut is isolated from the operating fluid, solving the corrosive problem.

[0031] In an embodiment of the utility model, the upper valve seat 8 and the central valve seat 10 are connected by bolts 9 , and the central valve seat 10 and the lower valve seat 12 are connected by a copy forest joint 11 .

[0032] In one embodiment of the utility model, the valve core 1 is T-shaped, and the valve core 1 includes a valve core shaft 13 and a valve core plate 14. The valve core shaft 13 passes through the central valve seat 10, and the valve core plate 14 is located in the lower valve seat 12. The outer diameter of the valve core plate 14 is larger than the maximum distance between the air hole of the central valve seat and the axis of the central valve seat. The force that pushes the valve core to move is coaxial with the valve core shaft 13, and there is no problem of deformation due to force.

[0033] In one embodiment of the utility model, the upper end of the valve core shaft 13 is provided with an external thread 131, and two locking nuts 2 are installed on the upper end of the valve core shaft 13. The outer diameter of the locking nut 2 is larger than the central hole 102 of the central valve seat for passing the valve core. In this way, the locking nut 2 plays a role of limiting. The utility model can adapt to different working conditions by adjusting the position of the locking nut 2 on the valve core shaft 13, compressing or releasing the spring to control the closing force and the gap between the valve core and the central valve seat.

[0034] In one embodiment of the utility model, the upper end surface of the valve core plate 14 is provided with a main sealing gasket 7 and a pressure plate 6 in sequence, and the pressure plate 6, the main sealing gasket 7 and the valve core plate 14 are connected by a plurality of screws 5. The utility model is easy to disassemble and assemble, and the central valve seat 10 and the lower valve seat 12 are connected by a copy forest joint 11. The internal valve core 1 and the main sealing gasket 7 can be directly inspected by disassembling the copy forest joint 11.

[0035] The utility model uses the principle of fluid mechanics to close the valve, which is different from the principle of the traditional valve using buoyancy to drive the float, and solves the problem that the float is not strong in pressure resistance. The valve core plate 14 can use different thicknesses according to different pressure levels.

[0036] In one embodiment of the utility model, a avoidance groove 103 is provided at the lower end of the central valve seat 10, the outer diameter of the avoidance groove is larger than the outer diameter of the pressure plate, and the outer diameter of the avoidance groove is smaller than the outer diameter of the sealing gasket, and the outer diameter of the sealing gasket is the same as the outer diameter of the valve core plate.

[0037] In one embodiment of the utility model, a rubber sealing pad 3 is provided at the contact point between the upper valve seat and the central valve seat.

[0038] The above contents are merely examples and explanations of the structure of the present utility model. The technicians in this technical field may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the structure of the present utility model or exceed the scope defined in the claims, they should all fall within the protection scope of the present utility model.

Claims

1. An automatic exhaust valve, characterized in that: It includes an upper valve seat, a center valve seat and a lower valve seat. The valve core passes through the center of the center valve seat. The center valve seat is provided with an air hole. The lower end of the valve core is located in the lower valve seat, and the upper end of the valve core is located in the upper valve seat. The outer diameter of the lower end of the valve core is larger than the maximum distance between the air hole of the center valve seat and the axis of the center valve seat. A spring is provided between the lower end of the valve core and the lower end of the center valve seat, and a locking nut is installed on the top of the valve core.

2. An automatic exhaust valve according to claim 1, characterized in that: The upper valve seat and the center valve seat are connected by bolts, and the center valve seat and the lower valve seat are connected by a copy forest joint.

3. The automatic exhaust valve according to claim 1, characterized in that: The valve core is T-shaped, and the valve core includes a valve core shaft and a valve core plate. The valve core shaft passes through the center valve seat, and the valve core plate is located in the lower valve seat. The outer diameter of the valve core plate is larger than the maximum distance between the air hole of the center valve seat and the axis of the center valve seat.

4. An automatic exhaust valve according to claim 3, characterized in that: The upper end of the valve core shaft is provided with an external thread, and two locking nuts are installed on the upper end of the valve core shaft. The outer diameter of the locking nuts is larger than the center hole of the center valve seat for passing the valve core.

5. The automatic exhaust valve according to claim 3, characterized in that: The upper end surface of the valve core plate is provided with a main sealing gasket and a pressure plate in sequence, and the pressure plate, the main sealing gasket and the valve core plate are connected by a plurality of screws.

6. An automatic exhaust valve according to claim 5, characterized in that: The lower end of the central valve seat is provided with an avoidance groove, the outer diameter of the avoidance groove is larger than the outer diameter of the pressure plate, the outer diameter of the avoidance groove is smaller than the outer diameter of the sealing gasket, and the outer diameter of the sealing gasket is the same as the outer diameter of the valve core plate.

7. An automatic exhaust valve according to claim 2, characterized in that: A rubber sealing gasket is provided at the contact point between the upper valve seat and the center valve seat.

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