Pneumatic needle valve for low-pressure soft seal

Abstract

The invention discloses a pneumatic needle valve for low-pressure soft sealing, and relates to the technical field of valves, the pneumatic needle valve comprises a gas piston adjusting screw, a spring body, a pneumatic piston and an air cylinder body, the spring body is arranged at the bottom end of the gas piston adjusting screw, and the pneumatic piston is arranged at the end, away from the gas piston adjusting screw, of the spring body; the air cylinder body is arranged on the surface of the pneumatic piston, the pneumatic piston is installed in the air cylinder body, the air cylinder bottom cover is arranged at the bottom end of the air cylinder body, the connecting piece is arranged at the end, away from the pneumatic piston, of the air cylinder bottom cover, and the connecting piece is connected with the air cylinder bottom cover through a locking bolt. A first guide groove and a second guide groove are formed in the low-pressure valve body, sealing filler is fixedly assembled in the first guide groove, the bottom end of the piston connecting rod is inserted into the guide groove and fixedly provided with a valve needle, the outer wall of the valve needle is tightly attached to the inner wall of the sealing filler, and the sealing performance of the interior of the low-pressure valve body is effectively improved.

Description

Technical Field

[0001] The invention relates to the technical field of valves, in particular to a pneumatic needle valve for low-pressure soft sealing. Background Art

[0002] The needle valve is a stop valve with a needle-shaped valve plug. It is mainly used as a switch for water circulation. When transporting water, a needle valve also needs to be installed on the transport pipeline. It is an important pneumatic control component. The pneumatic needle valve has the ability to switch quickly and is suitable for occasions that require rapid startup or emergency shutdown. It can quickly switch the gas circuit to achieve rapid control of the equipment.

[0003] The high-pressure pneumatic needle valves commonly used in the market are generally conventional pneumatic needle valves, which are designed for some high-pressure occasions. They have very high structural requirements and are expensive to manufacture. They are not easy to repair after being damaged. In addition, in some low-pressure environments, the leakage point of water under low pressure is difficult to find, making the pneumatic needle valve inconvenient to use. Summary of the invention

[0004] The object of the present invention is to provide a low-pressure soft-seal pneumatic needle valve to solve the problem that the pneumatic needle valve mentioned in the above background technology is inconvenient to use in a low-pressure environment.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a pneumatic needle valve for low-pressure soft sealing, comprising a gas piston adjusting screw, a spring body, a pneumatic piston and a cylinder body, the bottom end of the gas piston adjusting screw is provided with a spring body, the end of the spring body away from the gas piston adjusting screw is provided with a pneumatic piston, the surface of the pneumatic piston is provided with a cylinder body, the pneumatic piston is installed inside the cylinder body, the bottom end of the cylinder body is provided with a cylinder bottom cover, the end of the cylinder bottom cover away from the pneumatic piston is provided with a connecting piece, the connecting piece and the cylinder bottom cover are connected by locking bolts, the locking bolts are symmetrically distributed between the connecting piece and the cylinder bottom cover, and the end of the connecting piece away from the cylinder bottom cover is fixedly connected to a low-pressure valve body.

[0006] Preferably, a spring housing is provided on the surface of the spring body, the spring housing is provided at the top end of the cylinder body, and the bottom end of the spring body is connected to the top end of the pneumatic piston.

[0007] Preferably, a top end cover is provided at one end of the cylinder body away from the cylinder bottom cover, and the top end cover is connected to the spring housing.

[0008] Preferably, a piston connecting rod is arranged inside the connecting piece and the low-pressure valve body, a first guide groove is opened on the side of the low-pressure valve body close to the piston connecting rod, a sealing packing is arranged inside the first guide groove, a valve needle is arranged at one end of the sealing packing, and the valve needle and the sealing packing are both arranged inside the first guide groove.

[0009] Preferably, the bottom end of the piston connecting rod is inserted into the first guide groove and fixedly connected to the valve needle, the bottom end of the valve needle is provided with a sealing body, and the end of the sealing body away from the valve needle is provided with a sealing plug.

[0010] Preferably, a second guide groove is provided on a side of the low-pressure valve body close to the sealing body.

[0011] Preferably, the valve needle is in close contact with the sealing body, the sealing body is in close contact with the plug, a sealing packing is fixedly mounted on the inner wall of the first guide groove, and the outer wall of the valve needle is in close contact with the inner wall of the sealing packing.

[0012] Compared with the prior art, the beneficial effects of the present invention are as follows: the low-pressure soft-seal pneumatic needle valve has a pneumatic piston movably installed on the inner wall of the cavity in the cylinder body, a piston connecting rod is fixedly installed on the pneumatic piston, a spring housing is fixedly installed on the top of the cylinder body, a spring body is movably installed inside the spring housing, the spring body is limited by the spring housing to ensure that the spring body can perform stable telescopic movement on the inner wall of the spring housing; a first guide groove and a second guide groove are opened in the low-pressure valve body, a sealing filler is embedded and fixedly installed in the first guide groove, the bottom end of the above-mentioned piston connecting rod is inserted into the first guide groove and a valve needle is fixedly installed, and the outer wall of the valve needle and the sealing filler The inner wall of the pneumatic valve body is tightly fitted, which effectively improves the sealing performance inside the low-pressure valve body; a pneumatic piston sealing ring is embedded and fixedly sleeved in the annular groove on the outer wall of the pneumatic piston, and the pneumatic piston sealing ring is tightly fitted with the inner wall of the cavity in the cylinder body. When the driving gas is discharged into the air inlet at the bottom end of the cylinder body, it can prevent the gas from leaking from the gap on the edge of the pneumatic piston to the upper cavity, ensuring that the pneumatic piston can move stably up and down, and improving the stability of the driving piston connecting rod and the valve needle in the vertical direction. The sealing body is embedded and fixed in the guide groove, and the sealing plug presses against the reverse side of the sealing body to fix it; when the valve needle presses against the sealing body, water leakage can be prevented. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the three-dimensional structure of the spring housing of the present invention;

[0014] Figure 2 It is a schematic diagram of the three-dimensional structure of the connecting piece of the present invention;

[0015] Figure 3This is a schematic diagram of the main cutaway structure of the present invention;

[0016] Figure 4 It is a schematic diagram of the main structure of the present invention.

[0017] In the figure: 1. gas piston adjusting screw; 2. spring body; 3. pneumatic piston; 4. cylinder body; 5. cylinder bottom cover; 6. connecting piece; 7. low-pressure valve body; 8. spring housing; 9. top end cover; 10. piston connecting rod; 11. first guide groove; 12. sealing packing; 13. valve needle; 14. sealing body; 15. sealing plug; 16. second guide groove. DETAILED DESCRIPTION

[0018] 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.

[0019] See also Figure 1-Figure 4The present invention provides a technical solution: a low-pressure soft-seal pneumatic needle valve, comprising a gas piston adjusting screw 1, a spring body 2, a pneumatic piston 3 and a cylinder body 4, wherein the bottom end of the gas piston adjusting screw 1 is provided with a spring body 2, an end of the spring body 2 away from the gas piston adjusting screw 1 is provided with a pneumatic piston 3, a surface of the pneumatic piston 3 is provided with a cylinder body 4, the pneumatic piston 3 is installed inside the cylinder body 4, a cylinder bottom cover 5 is provided at the bottom end of the cylinder body 4, and the cylinder bottom cover 5 is away from the gas piston adjusting screw 1. A connecting piece 6 is provided at one end of the pneumatic piston 3, and the connecting piece 6 is connected to the cylinder bottom cover 5 by a locking bolt, and the locking bolts are symmetrically distributed between the connecting piece 6 and the cylinder bottom cover 5. The end of the connecting piece 6 away from the cylinder bottom cover 5 is fixedly connected to a low-pressure valve body 7, and a spring housing 8 is provided on the surface of the spring body 2, and the spring housing 8 is arranged at the top of the cylinder body 4. The bottom end of the spring body 2 is connected to the top of the pneumatic piston 3, and the end of the cylinder body 4 away from the cylinder bottom cover 5 is provided with a top The top end cover 9 is connected to the spring housing 8, the connecting piece 6 and the low-pressure valve body 7 are provided with a piston connecting rod 10, the low-pressure valve body 7 is provided with a first guide groove 11 on one side close to the piston connecting rod 10, the first guide groove 11 is provided with a sealing packing 12, one end of the sealing packing 12 is provided with a valve needle 13, the valve needle 13 and the sealing packing 12 are both provided in the first guide groove 11, the bottom end of the piston connecting rod 10 is inserted into the first guide groove 11 and connected with the valve needle 1 3 is fixedly connected, a sealing body 14 is arranged at the bottom end of the valve needle 13, a sealing plug 15 is arranged at one end of the sealing body 14 away from the valve needle 13, a second guide groove 16 is opened on one side of the low-pressure valve body 7 close to the sealing body 14, the valve needle 13 is in close contact with the sealing body 14, the sealing body 14 is in close contact with the sealing plug 15, a sealing packing 12 is fixedly installed on the inner wall of the first guide groove 11, and the outer wall of the valve needle 13 is in close contact with the inner wall of the sealing packing 12.

[0020] When it comes to specific implementation,

[0021] See also Figure 1-Figure 4It can be seen that a low-pressure valve body 7 is fixedly installed on a connecting piece 6 of a square frame structure below the cylinder body 4, and the low-pressure valve body 7 is fixed on the connecting piece 6 by screws, so as to facilitate its disassembly and assembly; a pneumatic piston 3 is movably installed on the inner wall of the cavity in the above-mentioned cylinder body 4, and a piston connecting rod 10 is fixedly installed on the pneumatic piston 3, and a spring housing 8 is fixedly installed on the top of the cylinder body 4, and a spring body 2 is movably installed inside the spring housing 8, and the spring body 2 is limited by the spring housing 8 to ensure that the spring body 2 can perform stable telescopic movement on the inner wall of the spring housing 8; a first guide groove 11 and a second guide groove 16 are opened in the low-pressure valve body 7, and a sealing filler 12 is embedded and fixedly installed in the first guide groove 11, and the bottom end of the above-mentioned piston connecting rod 10 is inserted into the first guide groove 11 and fixedly installed A valve needle 13 is installed, and the outer wall of the valve needle 13 fits tightly with the inner wall of the sealing filler 12, which effectively improves the sealing performance inside the low-pressure valve body 7; a pneumatic piston 3 sealing ring is embedded and fixedly sleeved in the annular groove on the outer wall of the pneumatic piston 3, and the pneumatic piston 3 sealing ring fits tightly with the inner wall of the cavity in the cylinder body 4. When the driving gas is discharged into the air inlet at the bottom end of the cylinder body 4, the gas can be prevented from leaking from the gap at the edge of the pneumatic piston 3 to the upper cavity, ensuring that the pneumatic piston 3 can move stably up and down, improving the stability of the driving piston connecting rod 10 and the valve needle 13 in the vertical direction, and the sealing body 14 is embedded and fixed in the second guide groove 16, and the sealing plug 15 presses against the back of the sealing body 14 to fix it; when the valve needle 13 presses against the sealing body 14, water leakage can be prevented.

[0022] In summary, the needle valve is a stop valve, and its valve plug is needle-shaped, mainly used as a switch for water circulation. A first guide groove 11 and a second guide groove 16 are opened in the low-pressure valve body 7. A sealing filler 12 is embedded and fixedly installed in the first guide groove 11. The bottom end of the piston connecting rod 10 is inserted into the first guide groove 11 and a valve needle 13 is fixedly installed. The outer wall of the valve needle 13 fits tightly with the inner wall of the sealing filler 12, which effectively improves the sealing performance inside the low-pressure valve body 7. A pneumatic piston 3 sealing ring is embedded and fixedly sleeved in the annular groove on the outer wall of the pneumatic piston 3. The pneumatic piston 3 sealing ring fits tightly with the inner wall of the cavity in the cylinder body 4. When the driving gas is discharged into the air inlet at the bottom end of the cylinder body 4, the gas can be prevented from leaking from the gap at the edge of the pneumatic piston 3 to the upper cavity, ensuring that the pneumatic piston 3 can move stably up and down, thereby improving the stability of the driving piston connecting rod 10 and the valve needle 13 in the vertical direction. The content not described in detail in this specification belongs to the existing technology known to professional and technical personnel in this field.

[0023] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A low-pressure soft-seal pneumatic needle valve, comprising a gas piston adjusting screw (1), a spring body (2), a pneumatic piston (3) and a cylinder body (4), characterized in that: A spring body (2) is arranged at the bottom end of the gas piston adjusting screw (1), a pneumatic piston (3) is arranged at one end of the spring body (2) away from the gas piston adjusting screw (1), a cylinder body (4) is arranged on the surface of the pneumatic piston (3), the pneumatic piston (3) is installed inside the cylinder body (4), a cylinder bottom cover (5) is arranged at the bottom end of the cylinder body (4), a connecting piece (6) is arranged at one end of the cylinder bottom cover (5) away from the pneumatic piston (3), the connecting piece (6) and the cylinder bottom cover (5) are connected by locking bolts, the locking bolts are symmetrically distributed between the connecting piece (6) and the cylinder bottom cover (5), and a low-pressure valve body (7) is fixedly connected to one end of the connecting piece (6) away from the cylinder bottom cover (5).

2. A low-pressure soft-seal pneumatic needle valve according to claim 1, characterized in that: A spring housing (8) is provided on the surface of the spring body (2), and the spring housing (8) is provided at the top end of the cylinder body (4). The bottom end of the spring body (2) is connected to the top end of the pneumatic piston (3).

3. A low-pressure soft-seal pneumatic needle valve according to claim 1, characterized in that: A top end cover (9) is provided at one end of the cylinder body (4) away from the cylinder bottom cover (5), and the top end cover (9) is connected to the spring housing (8).

4. A low-pressure soft-seal pneumatic needle valve according to claim 1, characterized in that: A piston connecting rod (10) is arranged inside the connecting piece (6) and the low-pressure valve body (7); a first guide groove (11) is provided inside the low-pressure valve body (7) on a side close to the piston connecting rod (10); a sealing filler (12) is arranged inside the first guide groove (11); a valve needle (13) is arranged at one end of the sealing filler (12); and the valve needle (13) and the sealing filler (12) are both arranged inside the first guide groove (11).

5. A low-pressure soft-seal pneumatic needle valve according to claim 4, characterized in that: The bottom end of the piston connecting rod (10) is inserted into the first guide groove (11) and fixedly connected to the valve needle (13); a sealing body (14) is provided at the bottom end of the valve needle (13); and a sealing plug (15) is provided at one end of the sealing body (14) away from the valve needle (13).

6. A low-pressure soft-seal pneumatic needle valve according to claim 4, characterized in that: A second guide groove (16) is provided on one side of the low-pressure valve body (7) close to the sealing element body (14).

7. A low-pressure soft-seal pneumatic needle valve according to claim 5, characterized in that: The valve needle (13) is in close contact with the sealing body (14), the sealing body (14) is in close contact with the plug (15), a sealing filler (12) is fixedly installed on the inner wall of the first guide groove (11), and the outer wall of the valve needle (13) is in close contact with the inner wall of the sealing filler (12).

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