A vacuum pump protection valve

Abstract

The present invention relates to a vacuum pump protection valve, comprising a valve body and a valve cover of a columnar hollow structure, wherein the valve body and the valve cover are connected by a sleeve connection, an air inlet interface is provided at the center of the bottom surface of the valve body away from the valve cover, a vacuum extraction interface is provided on the side of the valve body, a discharge interface is provided at one end of the valve cover away from the valve body, a valve core is sleeved inwardly with the internal air inlet interface of the valve body, the valve core is cylindrical and has a cylindrical block at one end close to the valve cover, a valve core baffle is provided inwardly with the internal valve core of the valve cover, the valve core baffle is cylindrical in design, a cylindrical block is provided on the circular bottom surface of the end of the valve core baffle close to the valve core, and the valve core baffle is connected to the discharge interface. The vacuum pump protection valve is small in size, has high pressure resistance, simple structure, reliable operation, long service life, and a wide range of applications.

Description

Technical Field

[0001] The invention relates to the field of gas pipelines, and is particularly suitable for the field of high-pressure gas cylinder filling, and in particular relates to a vacuum pump protection valve. Background Art

[0002] With the development of science and technology, the requirements for factory automation and safety are becoming increasingly higher, especially in the field of high-pressure gas cylinder filling. With the rapid development of filling technology, the filling control system and the cylinder vacuum system have begun to be integrated into an integrated design.

[0003] The high-pressure vacuum pump baffle valves currently on the market have the following problems: low pressure resistance, which cannot meet the application of cylinder filling; complex structure, mostly pneumatic or electric valves, with high procurement costs; the material cannot fully meet the requirements of cylinder filling. For example, GB / T50030-2013 "Oxygen Station Design Code" requires that the material of oxygen filling pipelines be copper and copper alloys or nickel and nickel-based alloys, while the vacuum pump baffle valves on the market are mostly made of carbon steel or stainless steel.

[0004] Based on the above problems, there is no domestic brand of vacuum pump baffle valve on the market that can meet the application of this system. A new product is urgently needed to fill the domestic gap in high-pressure vacuum pump protection valves. Summary of the Invention

[0005] In view of the deficiencies in the prior art, the present invention provides a vacuum pump protection valve to accelerate the realization of automation and intelligence in the field of high-pressure gas cylinder filling.

[0006] The present invention is achieved through the following technical solutions:

[0007] Provided is a vacuum pump protection valve, comprising a valve body and a valve cover, the valve body and the valve cover are columnar structures and hollow in design, the valve body and the valve cover are connected by a sleeve connection, an air inlet interface is provided at the center of the bottom surface of the valve body away from the valve cover, a vacuum interface is provided on the side of the valve body, a discharge interface is provided at one end of the valve cover away from the valve body, a plurality of through holes are provided around the vacuum interface, the air inlet interface and the discharge interface, a valve core is sleeved inside the internal air inlet interface of the valve body, the valve core is cylindrical and a cylindrical block is provided at one end close to the valve cover, a valve core baffle is provided inside the internal valve core of the valve cover, the valve core baffle is designed in a cylindrical shape, a cylindrical block is provided on the circular bottom surface of one end of the valve core baffle close to the valve core, and the valve core baffle is connected to the discharge interface.

[0008] Preferably, the cylindrical block is outer-coated with a valve core seal, and the valve core seal is located at a position where the valve body and the valve cover contact each other.

[0009] Preferably, the valve core sleeve is provided with two second sealing rings, and the vacuum extraction interface is located between the two sealing rings.

[0010] Preferably, the valve core is hollow in design and is provided with a plurality of through holes.

[0011] Preferably, the valve core baffle is provided with a plurality of through holes.

[0012] Preferably, the cross-sectional area of ​​the cylindrical blocking block is larger than the cross-sectional area of ​​the cylindrical stopper.

[0013] Preferably, the valve core baffle outer shell is provided with a first sealing ring.

[0014] Preferably, the valve body is made of brass with a copper content of less than 70%, and the valve core is made of stainless steel or nickel alloy.

[0015] The beneficial effects of the present invention are as follows: the vacuum pump protection valve has a small size, high pressure resistance, simple structure, reliable operation, long service life, and a wide range of applications; the valve body is made of brass (with a copper content of less than 70%), and the valve core is made of stainless steel or nickel alloy, which meets the requirements of national standards and can be used for non-corrosive gases including oxygen. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 Schematic diagram of the external structure of the vacuum pump protection valve of the present invention;

[0017] Figure 2 This is an internal cross-sectional view of the vacuum pump protection valve of the present invention;

[0018] Figure 3 Schematic diagram of the structure of the valve body of the present invention;

[0019] Figure 4 Schematic diagram of the structure of the valve cover of the present invention;

[0020] Figure 5 This is a schematic diagram of the connection between the valve core, valve core seal and valve core baffle of the present invention;

[0021] Figure 6 It is a structural schematic diagram of the valve core of the present invention;

[0022] Figure 7 This is a schematic structural diagram of the valve core baffle of the present invention;

[0023] As shown in the figure:

[0024] 1. Valve body, 2. Valve cover, 3. Air inlet interface, 4. Vacuum interface, 5. Release interface, 6. Valve core, 7. Block, 8. Valve core seal, 9. Valve core baffle, 10. Block, 11. First sealing ring, 12. Second sealing ring. DETAILED DESCRIPTION

[0025] In order to clearly illustrate the technical features of this solution, this solution is described below through specific implementation methods.

[0026] See also Figure 1 A vacuum pump protection valve includes a valve body 1 and a valve cover 2, both made of copper. The valve body 1 and valve cover 2 are cylindrical and hollow, connected by a sleeve connection. An air inlet port 3 is provided at the center of the bottom surface of the valve body 1, away from the valve cover 2. A vacuum port 4 is provided on the side of the valve body 1. A discharge port 5 is provided at the end of the valve cover 2, away from the valve body 1. Several through holes are provided around the vacuum port 4, air inlet port 3, and discharge port 5 to facilitate gas removal.

[0027] See also Figure 2-6 The internal air inlet interface 3 of the valve body 1 is sleeved with a valve core 6. The valve core 6 is cylindrical and hollow, and a plurality of through holes are provided on the outer wall. The valve core 6 is sleeved with two second sealing rings 12, and the vacuum interface 4 is located between the two sealing rings. A cylindrical block 7 is provided at one end of the valve core 6 close to the valve cover 2, and a valve core seal 8 is provided on the outer sleeve of the cylindrical block 7. The valve core seal 8 is located at the contact position between the valve body 1 and the valve cover 2.

[0028] See also Figure 7 A valve core baffle 9 is provided inwardly of the valve core 6 within the valve cover 2. This valve core baffle 9 is cylindrical and has a plurality of through-holes. A cylindrical block 10 is provided on the circular bottom surface of the valve core baffle 9 near the valve core 6. A first sealing ring 11 is provided over the valve core baffle 9. The valve core baffle 9 is connected to the relief port 5. The cylindrical block 7 and cylindrical block 10 have the same cross-section.

[0029] The working principle of the present invention is as follows: the air inlet interface 3 of the vacuum pump protection valve is connected to the pipe or container that needs to be vacuumed, the vacuum interface 4 is connected to the air inlet of the vacuum pump, and the discharge interface 5 is connected to the discharge pipe. During vacuuming, if the gas pressure in the pipe or other container that needs to be vacuumed connected to the air inlet interface 3 is too high, the valve core 6 moves toward the end of the valve cover 2 under the push of the air pressure, so that the air inlet interface 3 is connected to the discharge interface 5, and the gas is discharged from the discharge interface 5. As the discharge pressure of the gas drops, when it drops to a certain level, under the influence of gravity, the valve core 6 automatically falls, and the air inlet interface 3 is connected to the vacuum interface 4, and vacuuming of the pipe or other container that needs to be vacuumed begins, thereby avoiding damage to the vacuum pump caused by excessive gas pressure and playing a protective role in the vacuum pump.

[0030] Of course, the above description is not limited to the above examples. Technical features not described in the present invention can be achieved by or by adopting existing technologies, which will not be described here. The above embodiments and drawings are only used to illustrate the technical solutions of the present invention and are not limitations of the present invention. The present invention is described in detail with reference to the preferred implementation methods. Ordinary technicians in this field should understand that changes, modifications, additions or substitutions made by ordinary technicians in this technical field within the essential scope of the present invention do not depart from the purpose of the present invention and should also fall within the scope of protection of the claims of the present invention.

Claims

1. A vacuum pump protection valve, comprising a valve body (1) and a valve cover (2), characterized in that: The valve body (1) and the valve cover (2) are columnar structures and are hollow in design. The valve body (1) and the valve cover (2) are connected by sleeve connection. An air inlet interface (3) is provided at the center of the bottom surface of the valve body (1) away from the valve cover (2). A vacuum interface (4) is provided on the side of the valve body (1). A discharge interface (5) is provided at one end of the valve cover (2) away from the valve body (1). A plurality of through holes are provided around the vacuum interface (4), the air inlet interface (3) and the discharge interface (5). The internal air inlet interface (3) of the valve body (1) is provided with a valve core (6) inwardly, the valve core (6) is cylindrical and is provided with a cylindrical blocking block (7) at one end close to the valve cover (2), the internal valve core (6) of the valve cover (2) is provided with a valve core baffle (9) inwardly, the valve core baffle (9) is designed in a cylindrical shape, and a cylindrical blocking block (10) is provided on the circular bottom surface of one end of the valve core baffle (9) close to the valve core (6), and the valve core baffle (9) is connected to the release interface (5); The valve core (6) is hollow in design, and a plurality of through holes are provided on the valve core (6); The valve core baffle (9) is provided with a plurality of through holes; The cross-sectional area of ​​the cylindrical blocking block (7) is greater than the cross-sectional area of ​​the cylindrical stopper (10); The valve core (6) is sleeved with two second sealing rings (12), and the vacuum port (4) is located between the two sealing rings; The valve body (1) is made of brass with a copper content of less than 70%, and the valve core (6) is made of stainless steel or nickel alloy.

2. The vacuum pump protection valve according to claim 1, characterized in that: The cylindrical block (7) is provided with a valve core seal (8) on its outer sleeve, and the valve core seal (8) is located at a position where the valve body (1) and the valve cover (2) are in contact.

3. The vacuum pump protection valve according to claim 1, characterized in that: The valve core baffle (9) is provided with a first sealing ring (11) on its outer sleeve.

Images