Magnetic lifting check valve

Abstract

A magnetic lifting type check valve comprises a magnetic valve plate, a magnetic end cover and a non-magnetic valve body, and the magnetic end cover is fixedly installed at the top end of the valve body. A through hole is formed in the center of the magnetic end cover, and the magnetic valve plate is installed in an inner cavity of the valve body and can ascend and descend in the inner cavity of the valve body. When the magnetic valve plate ascends to abut against the magnetic end cover, the magnetic valve plate covers and seals the central through hole of the magnetic end cover, and the magnetic lifting type check valve is closed. And when the magnetic valve plate descends to leave the magnetic end cover, the magnetic lifting check valve is opened. The device is simple in structure and convenient to manufacture; a reset spring is replaced by magnetic attraction, and the technical problem that high vacuum of an existing check valve is difficult to keep is solved.

Description

Technical Field

[0001] This invention relates to the field of valve technology, specifically to a valve with a check valve function. Background Technology

[0002] In a vacuum system, if the vacuum equipment suddenly malfunctions or loses power, the gas flow in the pipeline can flow backward into the vacuum equipment, causing it to lose its ability to maintain a vacuum. If left uncontrolled, this could lead to accidents or damage to the equipment. Currently, check valves are commonly used to solve this problem. However, ordinary check valves with return springs have significant resistance, posing a problem in high-vacuum environments. The current solution is to install lift-type check valves with lower spring resistance in the vacuum pipeline to prevent gas from entering the vacuum equipment when the vacuum pump system suddenly fails. However, these valves also have return springs and still have some resistance. In high vacuum conditions, the pumping airflow is too weak to overcome the spring force of the return spring, causing the valve to frequently close, affecting normal pumping operations and preventing further increases in vacuum level. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to address the problems existing in the prior art by providing a check valve that relies on magnetic force for reset. In the initial state, the magnetic end cap and the magnetic valve plate are naturally closed due to attraction. During normal operation, the fluid pushes open the valve plate, and after the valve plate falls back, it is far from the magnetic end cap and the magnetic force is weak, so it will not automatically close during high vacuum operation. However, when the vacuum system suddenly fails, the airflow reverses and pushes up the valve plate. The valve plate moves along the guide rod toward the magnetic end cap, and at this time, the magnetic force acts as an attraction to close the valve, thus preventing airflow from entering the vacuum equipment.

[0004] The technical solution adopted in this invention is: A magnetic lift check valve includes a magnetic valve plate, a magnetic end cap, and a non-magnetic valve body. The magnetic end cap is fixed to the top of the valve body. The magnetic end cap has a through hole in its center. The magnetic valve plate is installed in the inner cavity of the valve body and can move up and down within the inner cavity. When the magnetic valve plate rises and presses against the magnetic end cap, it covers and closes the through hole in the center of the magnetic end cap, thus closing the magnetic lift check valve. When the magnetic valve plate descends and leaves the magnetic end cap, the magnetic lift check valve opens.

[0005] In the above technical solution, the magnetic valve plate moves up and down in the valve body cavity, supported by a non-magnetic guide rod and a support. The top of the guide rod is connected and fixed to the magnetic valve plate, and the support is connected and fixed to the valve body. A guide hole is opened in the center of the support, and the guide rod is inserted into the guide hole in the center of the support for sliding engagement.

[0006] In the above technical solution, the magnetic valve plate is made of any magnetic material, and the magnetic end cap is made of any magnetic material.

[0007] Initially, the magnetic end cap and magnetic valve plate are attracted to each other, forming a closed state. Under normal production evacuation conditions, when airflow opens the valve, the magnetic valve plate moves away from the magnetic end cap. At this time, the magnetic attraction weakens and cannot close, thus keeping the pipeline unobstructed. When the vacuum system suddenly fails, the airflow in the pipeline flows in reverse, pushing the magnetic valve plate against the magnetic end cap. At this time, the valve closes, thus preventing airflow from entering the vacuum equipment.

[0008] This invention relates to a magnetic lifting check valve, which addresses the problem of excessive resistance caused by the spring in existing check valves with return springs. When the airflow is too weak to overcome the spring force, the valve frequently closes, making it difficult to maintain a high vacuum. This invention cleverly uses magnetic attraction instead of a spring, effectively utilizing the property that magnetism weakens rapidly with increasing distance. Once the valve is open, it will not close again under normal operating conditions, making it particularly suitable for vacuum systems. Furthermore, when the vacuum equipment malfunctions or experiences a sudden power outage, the airflow reverses, closing the valve and preventing airflow from entering the vacuum equipment. This invention's use of magnetic attraction instead of a return spring represents a technological breakthrough.

[0009] The prominent substantive features of this invention are: 1. Simple structure, easy to manufacture; 2. By using magnetic attraction instead of a return spring, the technical problem of maintaining a high vacuum in existing check valves is solved; 3. Once the valve is opened, it will not automatically close due to a decrease in airflow, making it particularly suitable for check valve functions in high vacuum environments; 4. Installation is not limited to vertical installation; horizontal installation is also possible. 5. It can be used in any fluid transport field, but care should be taken to avoid demagnetization at excessively high temperatures. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the magnetic lifting check valve structure of the present invention; Attached image annotations: 1-Magnetic valve plate, 2-Magnetic end cap, 3-Guide rod, 4-Support, 5-Valve body. Detailed Implementation

[0011] See Figure 1 The magnetic lift check valve includes a magnetic valve plate 1, a magnetic end cap 2, a guide rod 3, a support 4, and a valve body 5. The magnetic valve plate 1 and the magnetic end cap 2 can be made of any magnetic material. The guide rod 3 is connected to the magnetic valve plate 1 and is inserted into the guide hole of the support 4. The support 4 is connected to the valve body 5.

[0012] During use, the airflow enters through the central through-hole at the upper end of the magnetic end cover 2, pushes open the magnetic valve plate, and flows to the lower end. At this time, the magnetic valve plate moves away from the magnetic end cover, the magnetic attraction weakens, and it will not close automatically. However, when the equipment malfunctions or the vacuuming stops due to power failure, the airflow reverses and pushes the magnetic valve plate towards the magnetic end cover. At this time, the valve closes, thereby preventing the airflow from entering the vacuum equipment, protecting the vacuum level of the equipment, and avoiding damage to the product and equipment.

Claims

1. A magnetic lift check valve, characterized by: The magnetic valve plate, the magnetic end cover and the valve body without magnetism are included, and the magnetic end cover is fixedly installed on the top end of the valve body.

2. The magnetic lift check valve of claim 1, wherein: The magnetic end cover is provided with a through hole in the center, the magnetic valve plate is installed in the inner cavity of the valve body and can move up and down in the inner cavity of the valve body, when the magnetic valve plate rises and presses against the magnetic end cover, the magnetic valve plate covers and seals the through hole in the center of the magnetic end cover, and the magnetic lifting check valve is closed; when the magnetic valve plate falls away from the magnetic end cover, the magnetic lifting check valve is opened.

3. The magnetic lift check valve of claim 1, wherein: The magnetic valve plate is supported by the guide rod without magnetism and the support in the inner cavity of the valve body, the top end of the guide rod is connected with the magnetic valve plate and is fixed, the support is connected with the valve body and is fixed, the support is provided with a guide hole in the center, and the guide rod is inserted into the guide hole in the center of the support and is in sliding fit. The magnetic valve plate is made of any magnetic material, and the magnetic end cover is made of any magnetic material.

Images