A hard-sealed high-purity gas pressure reducing valve

Abstract

The present invention discloses a hard-sealed high-purity gas pressure reducing valve, comprising a lower valve body, a rear cover connected to the lower valve body by threads, an upper valve body arranged between the rear cover and the lower valve body, the top of the upper valve body tightly connected to the rear cover by a pressure block, and the bottom of the upper valve body tightly connected to the lower valve body by a metal O-ring and a metal C-ring; a diaphragm is arranged on the top of the upper valve body, the diaphragm is connected to a pressure regulating spring, one end of the pressure regulating spring is connected to a top screw passing through the rear cover; a valve needle is arranged in the lower valve body, one end of the valve needle contacts the bottom of the diaphragm, and the other end is connected to the lower valve body by a small spring. The hard-sealed high-purity gas pressure reducing valve provided by the present invention has good sealing surface elasticity and high sealing precision.

Description

Technical Field

[0001] The invention relates to the technical field of pressure reducing valve sealing, in particular to a hard-sealed high-purity gas pressure reducing valve. Background Art

[0002] High-purity gas pressure reducing valves are used in high-purity gas pipelines and high-purity gas equipment. The sealing of high-purity gas valves is a key technology in valve design and application. Valve seals are usually divided into two categories: soft seals and hard seals. Hard seals use metal-to-metal sealing. Since they are mainly used in high-purity and high-pressure situations, they have strict requirements on the surface roughness, corrosion resistance, hardness and other properties of the sealing pair metal. However, due to the poor flexibility and elasticity of metals, the processing accuracy of the sealing surface is required to be high, and the processing cost is high. Metal-to-metal sealing is a forced seal that requires a large operating force and a locking device. Summary of the invention

[0003] The object of the present invention is to provide a hard-sealed high-purity gas pressure reducing valve to solve the problems existing in the above-mentioned prior art, so that the sealing surface has good elasticity and high sealing precision.

[0004] To achieve the above object, the present invention provides the following solutions:

[0005] The present invention provides a hard-sealed high-purity gas pressure reducing valve, comprising a lower valve body, a rear cover being connected to the lower valve body via threads, an upper valve body being arranged between the rear cover and the lower valve body, the top of the upper valve body being tightly connected to the rear cover via a pressure block, and the bottom of the upper valve body being tightly connected to the lower valve body via a metal O-ring and a metal C-ring; a diaphragm being arranged on the top of the upper valve body, the diaphragm being connected to a pressure-regulating spring, one end of the pressure-regulating spring being connected to a top screw passing through the rear cover; a valve needle being arranged in the lower valve body, one end of the valve needle being in contact with the bottom of the diaphragm, and the other end being connected to the lower valve body via a small spring.

[0006] Optionally, the rear cover includes a front part, a rear part and a connecting part, the inner diameter of the front part is larger than the inner diameter of the rear part, the outer diameter of the front part is larger than the outer diameter of the rear part, the front part and the rear part are fixedly connected via a horizontal connecting part; the front part is sealingly connected to the lower valve body via a thread.

[0007] Optionally, the front portion, the rear portion and the connecting portion are integrally formed.

[0008] Optionally, the front portion is vertically connected to the connecting portion, and the rear portion is vertically connected to the connecting portion.

[0009] Optionally, the pressing block is located in the front portion and is tightly connected to the inner wall of the connecting portion.

[0010] Optionally, the pressure-adjusting spring is located in the rear portion, and the top screw is passed through the bottom of the rear portion and is connected to the pressure-adjusting spring.

[0011] Optionally, one end of the top screw is connected to a handle, and the handle is sleeved on the outer wall of the rear portion.

[0012] Optionally, one end of the valve needle contacts the bottom of the diaphragm, and the other end contacts a small spring, the small spring is connected to the lower valve body, and a sealing gasket is provided at the contact point between the valve needle and the upper valve body.

[0013] Optionally, a connecting block is provided at the connection between the pressure-adjusting spring and the top screw.

[0014] Compared with the prior art, the present invention has achieved the following technical effects:

[0015] The hard-sealed high-purity gas pressure reducing valve provided by the present invention is easier to assemble; the metal ring sealing structure has compensatory properties, can compensate for the processing errors of parts within a certain range, has better sealing properties, and can obtain a lower leakage rate; the metal ring sealing structure has good repeatability; the metal sealing ring has good sealing properties, good corrosion resistance, and is not prone to aging after long-term use. The internal structure of the pressure reducing valve is simpler, which is conducive to parts processing and electrolytic polishing, and it is easier to obtain the electrolytic polishing surface required for high-purity gas. The internal structure is more compact, and a smaller dead volume can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0017] Figure 1 It is a schematic cross-sectional structure diagram of a hard-sealed high-purity gas pressure reducing valve of the present invention;

[0018] Figure 2 A schematic diagram of the metal O-ring structure of the hard-sealed high-purity gas pressure reducing valve of the present invention;

[0019] Figure 3 A schematic diagram of the structure of a metal C-ring of a hard-sealed high-purity gas pressure reducing valve of the present invention;

[0020] Explanation of the reference numerals in the accompanying drawings: 1. Handle, 2. Top screw, 3. Back cover, 3-1. Front part, 3-2. Back part, 3-3. Connecting part, 4. Pressure-adjusting spring, 5. Pressure block, 6. Upper valve body, 7. Lower valve body, 8. Valve needle, 9. Diaphragm, 10. Sealing gasket, 11. Metal O-ring, 12. Metal C-ring, 13. Small spring. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] The object of the present invention is to provide a hard-sealed high-purity gas pressure reducing valve to solve the problems existing in the above-mentioned prior art, so that the sealing surface has good elasticity and high sealing precision.

[0023] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0024] The present invention provides a hard-sealed high-purity gas pressure reducing valve, such as Figure 1-3 As shown, it includes a lower valve body 7, which is connected to a back cover 3 by threads, an upper valve body 6 is arranged between the back cover 3 and the lower valve body 7, the top of the upper valve body 6 is tightly connected to the back cover 3 by a pressure block 5, and the bottom of the upper valve body 6 is tightly connected to the lower valve body 7 by a metal O-ring 11 and a metal C-ring 12; a diaphragm 9 is arranged on the top of the upper valve body 6, and the diaphragm 9 is connected to a pressure-adjusting spring 4, and one end of the pressure-adjusting spring 4 is connected to a top screw 2 penetrated on the back cover 3; a valve needle 8 is arranged in the lower valve body 7, one end of the valve needle 8 is in contact with the bottom of the diaphragm 9, and the other end is connected to the lower valve body 7 by a small spring 13.

[0025] Specifically, the rear cover 3 includes a front part 3-1, a rear part 3-2 and a connecting part 3-3. The inner diameter of the front part 3-1 is larger than the inner diameter of the rear part 3-2, the outer diameter of the front part 3-1 is larger than the outer diameter of the rear part 3-2, and the front part 3-1 and the rear part 3-2 are fixedly connected through the horizontally arranged connecting part 3-3; the front part 3-1 is sealed and connected to the lower valve body 7 through a thread. The front part 3-1, the rear part 3-2 and the connecting part 3-3 are integrally formed. The front part 3-1 is vertically connected to the connecting part 3-3, and the rear part 3-2 is vertically connected to the connecting part 3-3. The pressing block 5 is located in the front part 3-1 and is tightly connected to the inner wall of the connecting part 3-3. The upper valve body 6 is nested in the pressing block 5, and the end of the diaphragm 9 is located between the pressing block 5 and the upper valve body 6, and is fixed to the upper valve body 6 through the pressing block 5; the pressure regulating spring 4 is located in the rear part 3-2, and the top screw 2 is passed through the bottom of the rear part 3-2 and is connected to the pressure regulating spring 4.

[0026] Preferably, one end of the top screw 2 is connected to a handle 1, which is sleeved on the outer wall of the rear portion 3-2. One end of the valve needle 8 contacts the bottom of the diaphragm 9, and the other end is connected to the lower valve body 7 through a small spring 13. A sealing gasket is provided at the contact between the valve needle and the upper valve body.

[0027] The top of the sealing gasket 10 is in close contact with the upper valve body 6; the specific connection method is that the lower valve body 7 is provided with a groove, the small spring 13 is located in the groove, one end of the small spring 13 is connected to the bottom of the groove, and the other end is connected to the valve needle, one side of the groove is connected to an outlet, and the other side of the groove is provided with an inlet, which is connected to the upper valve body 6.

[0028] The back cover 3 of the present invention is screwed with the lower valve body 7 to make the pressure block 5, diaphragm 9, upper valve body 6, metal O-ring 11, and metal C-ring 12 fit and press tightly, and the upper valve body 6 and lower valve body 7 are in contact with the metal C-ring 12 and metal O-ring 11. The metal C-ring 12 and metal O-ring 11 are squeezed to generate elastic force for sealing, and the elastic deformation of the metal C-ring 12 and metal O-ring 11 when subjected to force is mainly used to ensure the sealing of the upper valve body 6 and lower valve body 7 that may have processing errors. Through the sealing of the metal C-ring and metal O-ring, the high-pressure chamber, low-pressure chamber, and atmosphere of the pressure reducing valve are isolated and sealed, thereby achieving the required conditions for pressure reduction.

[0029] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A hard-sealed high-purity gas pressure reducing valve, characterized in that: It comprises a lower valve body, which is connected to a back cover via threads, an upper valve body is arranged between the back cover and the lower valve body, the top of the upper valve body is tightly connected to the back cover via a pressing block, and the bottom of the upper valve body is tightly connected to the lower valve body via a metal O-ring and a metal C-ring; a diaphragm is arranged on the top of the upper valve body, the diaphragm is connected to a pressure-adjusting spring, one end of the pressure-adjusting spring is connected to a top screw passed through the back cover; a valve needle is arranged in the lower valve body, one end of the valve needle contacts with the bottom of the diaphragm, and the other end is connected to the lower valve body via a small spring; the upper valve body is nested in the pressing block, and the end of the diaphragm is located between the pressing block and the upper valve body, and is fixed to the upper valve body via the pressing block.

2. The hard-sealed high-purity gas pressure reducing valve according to claim 1, characterized in that: The rear cover includes a front part, a rear part and a connecting part, the inner diameter of the front part is larger than the inner diameter of the rear part, the outer diameter of the front part is larger than the outer diameter of the rear part, the front part and the rear part are fixedly connected via a horizontal connecting part; the front part is sealed and connected to the lower valve body via a thread.

3. The hard-sealed high-purity gas pressure reducing valve according to claim 2, characterized in that: The front part, the rear part and the connecting part are integrally formed.

4. The hard-sealed high-purity gas pressure reducing valve according to claim 2, characterized in that: The front portion is vertically connected to the connecting portion, and the rear portion is vertically connected to the connecting portion.

5. The hard-sealed high-purity gas pressure reducing valve according to claim 4, characterized in that: The pressing block is located in the front portion and is tightly connected to the inner wall of the connecting portion.

6. The hard-sealed high-purity gas pressure reducing valve according to claim 4, characterized in that: The pressure regulating spring is located in the rear portion, and the top screw is passed through the bottom of the rear portion and is connected to the pressure regulating spring.

7. The hard-sealed high-purity gas pressure reducing valve according to claim 6, characterized in that: One end of the top screw is connected with a handle, and the handle is sleeved on the outer wall of the rear part.

8. The hard-sealed high-purity gas pressure reducing valve according to claim 1, characterized in that: One end of the valve needle contacts the bottom of the diaphragm, and the other end contacts a small spring. The small spring is connected to the lower valve body. A sealing gasket is provided at the contact point between the valve needle and the upper valve body.

9. The hard-sealed high-purity gas pressure reducing valve according to claim 1, characterized in that: A connecting block is provided at the connection between the pressure regulating spring and the top screw.

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