Anti-collision compression cylinder capable of reducing clearance volume

Abstract

The utility model relates to the technical field of compression cylinders, in particular to an anti-collision compression cylinder capable of reducing clearance volume. Comprising a compression cylinder body, a compression piston is arranged in the compression cylinder body, one end of the compression piston is connected with a piston rod, a protruding part is arranged in the center of the end face of the other end of the compression piston and used for extending into a liquid inlet to reduce the clearance volume of the liquid inlet, and a non-metal anti-collision part is arranged on the end face, on the outer side of the protruding part, of the compression piston. The non-metal anti-collision part is used for reducing the clearance volume in the compression cylinder body and preventing the front end of the compression piston from colliding with the compression cylinder body, and the clearance volume between the front end of the compression piston and the compression cylinder body is smaller than 5% when the piston rod completely extends. The clearance volume is further reduced, the compression efficiency is improved, the problem that the front end of the compression piston is prone to colliding with the inner wall of the compression cylinder body is solved, the compression piston is protected, collision deformation of the compression piston is avoided, and the operation precision and the sealing performance of the compression piston are guaranteed.

Description

Technical field:

[0001] The utility model relates to the technical field of compression cylinders, in particular to an anti-collision compression cylinder with reduced clearance volume. Background technology:

[0002] The existing LNG booster pump has a structure such as the patent application with publication number CN104279135A, which discloses a low-pressure cryogenic pump assembly. When working, the compression cylinder is inserted into the LNG bottle, the hydraulic cylinder is located outside the LNG bottle, the cylinder piston in the hydraulic cylinder reciprocates under the push of the hydraulic oil, the cylinder piston drives the piston rod to reciprocate, and the piston rod drives the compression piston in the compression cylinder to reciprocate, so that the cryogenic liquid enters the compression cylinder through the liquid inlet valve, and then is discharged from the liquid outlet valve to the outside, thereby increasing the pressure of the cryogenic liquid. Among them, due to the manufacturing tolerance limit of the current compression cylinder and in order to avoid the front end of the compression piston from colliding with the inner wall of the compression cylinder, when the piston rod is fully extended, there will be a clearance volume between the front end of the compression piston and the compression cylinder. The current clearance volume is generally between 5% and 20%, and the fluid remaining in the clearance volume will not be discharged at the end of the compression stroke, thereby reducing the compression efficiency. At present, there is no good solution in the industry for how to further reduce the clearance volume, improve the compression efficiency, and solve the anti-collision problem of the compression piston at the same time.

[0003] In summary, the clearance volume and anti-collision issues of the cold-end compression cylinder of the LNG boosting pump have become technical problems that need to be urgently solved in the industry. Utility model content:

[0004] In order to make up for the deficiencies of the prior art, the utility model provides an anti-collision compression cylinder with reduced clearance volume, which solves the problems of large clearance volume and low compression efficiency of the previous compression cylinder and solves the problem that the front end of the compression piston is easily deformed by collision with the inner wall of the compression cylinder.

[0005] The technical solution adopted by the utility model to solve the above technical problems is:

[0006] A collision-proof compression cylinder for reducing clearance volume comprises a compression cylinder body, a liquid inlet and a liquid outlet are arranged on the compression cylinder body, a compression piston is arranged in the compression cylinder body, a plurality of sealing rings are arranged on the outer surface of the compression piston, one end of the compression piston is connected to a piston rod, a protrusion is arranged at the center position of the end surface of the other end of the compression piston, the protrusion is used to extend into the liquid inlet to reduce the clearance volume of the liquid inlet, a non-metallic collision-proof part is arranged on the end surface of the compression piston outside the protrusion, the non-metallic collision-proof part is used to reduce the clearance volume in the compression cylinder body and prevent the front end of the compression piston from colliding with the compression cylinder body, and the clearance volume between the front end of the compression piston and the compression cylinder body is less than 5% when the piston rod is fully extended.

[0007] The front end surface of the compression piston is a conical surface, the non-metallic anti-collision part is a conical body matched with the conical surface, and a conical hole matched with the conical body is arranged in the compression cylinder body.

[0008] The non-metallic anti-collision part is compositely connected with the compression piston through vulcanization or injection molding.

[0009] A non-metallic guide portion is provided on the side surface of the front end of the compression piston. The non-metallic guide portion is used to guide the reciprocating motion of the compression piston. The non-metallic guide portion and the non-metallic anti-collision portion are integrally formed.

[0010] The non-metallic guide part is compositely connected with the compression piston through vulcanization or injection molding.

[0011] The outer surface of the non-metallic guide portion is slightly higher than the outer surface of the compression piston.

[0012] The utility model adopts the above scheme and has the following advantages:

[0013] A protrusion is provided at the center of the front end face of the compression piston, and the protrusion can extend into the liquid inlet to reduce the clearance volume of the liquid inlet. A non-metallic anti-collision portion is provided on the compression piston end face outside the protrusion. The non-metallic anti-collision portion can reduce the clearance volume in the compression cylinder body and prevent the front end of the compression piston from colliding with the compression cylinder. When the piston rod is fully extended, the clearance volume between the front end of the compression piston and the compression cylinder body is less than 5%, which further reduces the clearance volume, improves the compression efficiency, and solves the problem that the front end of the compression piston is easy to collide with the inner wall of the compression cylinder body, protects the compression piston, avoids the compression piston from collision and deformation, and ensures the running accuracy and sealing performance of the compression piston.

[0014] A non-metallic guide portion is provided on the side of the front end of the compression piston, and the non-metallic guide portion and the non-metallic anti-collision portion are integrally formed, so that the anti-collision and guide are integrated into one, which can solve the guiding problem of the compression piston, simplify the processing technology, and solve the end anti-collision problem of the compression piston. The non-metallic guide portion and the non-metallic anti-collision portion are made of PTFE or PCTFE material, which is resistant to pressure and low temperature, has strong corrosion resistance, and has more stable and reliable performance under low temperature and high pressure environment. Description of the drawings:

[0015] Figure 1 It is a cross-sectional structural schematic diagram of the utility model.

[0016] In the figure, 1. compression cylinder, 2. liquid inlet, 3. liquid outlet, 4. compression piston, 5. sealing ring, 6. piston rod, 7. protrusion, 8. non-metallic anti-collision part, 9. dovetail groove structure, and 10. non-metallic guide part. Specific implementation method:

[0017] In order to clearly illustrate the technical features of the present invention, the present invention is described in detail below through specific implementation methods and in conjunction with the accompanying drawings.

[0018] like Figure 1 As shown, a collision-proof compression cylinder for reducing the clearance volume comprises a compression cylinder body 1, a liquid inlet 2 and a liquid outlet 3 are provided on the compression cylinder body 1, a compression piston 4 is provided in the compression cylinder body 1, a plurality of sealing rings 5 ​​are provided on the outer surface of the compression piston 4, one end of the compression piston 4 is connected to a piston rod 6, a protrusion 7 is provided at the center position of the end surface of the other end of the compression piston 4, the protrusion 7 is used to extend into the liquid inlet 3 to reduce the clearance volume of the liquid inlet 3, a non-metallic collision-proof part 8 is provided on the end surface of the compression piston 4 outside the protrusion 7, the non-metallic collision-proof part 8 is used to reduce the clearance volume in the compression cylinder body 1 and prevent the front end of the compression piston 4 from colliding with the compression cylinder body 1, and when the piston rod 6 is fully extended, the clearance volume between the front end of the compression piston 4 and the compression cylinder body 1 is less than 5%, which further reduces the clearance volume and improves the compression efficiency.

[0019] The front end surface of the compression piston 4 is a conical surface, the non-metallic anti-collision portion 8 is a conical body matched with the conical surface, and a conical hole matched with the conical body is provided in the compression cylinder body 1.

[0020] The non-metallic anti-collision part 8 is made of PTFE or PCTFE material, which is resistant to pressure and low temperature, has strong anti-corrosion ability, and has more stable and reliable performance under low temperature and high pressure environment.

[0021] The non-metallic anti-collision part 8 is compositely connected to the compression piston 4 by vulcanization or injection molding, which has a simple process, a firm connection, and is not easy to fall off.

[0022] The non-metallic anti-collision part 8 is connected to the compression piston 4 via a dovetail groove structure 9, which can increase the connection strength.

[0023] A non-metallic guide portion 10 is provided on the front end side of the compression piston 4, and the non-metallic guide portion 10 is used to guide the reciprocating motion of the compression piston 4. The non-metallic guide portion 10 is integrally formed with the non-metallic anti-collision portion 8, integrating anti-collision and guidance into one, which can solve the guiding problem of the compression piston 4, making the processing technology simpler, and can also solve the end anti-collision problem of the compression piston 4.

[0024] The non-metallic guide part 10 is made of PTFE or PCTFE material, which is resistant to pressure and low temperature, has strong anti-corrosion ability, and has more stable and reliable performance under low temperature and high pressure environment.

[0025] The non-metallic guide part 10 is compositely connected to the compression piston 4 by vulcanization or injection molding, which has a simple process, a firm connection, and is not easy to fall off.

[0026] The non-metallic guide part 10 is connected to the compression piston 4 via a dovetail groove structure 9, which can increase the connection strength.

[0027] The outer surface of the non-metallic guide portion 10 is slightly higher than the outer surface of the compression piston 4 , and plays a guiding role in the reciprocating motion of the compression piston 4 .

[0028] Working principle:

[0029] During the reciprocating motion of the compression piston 4 driven by the piston rod 6, when the piston rod 6 is fully extended, the protrusion 6 will extend into the liquid inlet 2 to reduce the clearance volume of the liquid inlet 2, and the non-metallic anti-collision portion 8 will be closer to the inner wall of the compression cylinder body 1 to reduce the clearance volume in the compression cylinder body 1. The combination of the two can make the clearance volume between the front end of the compression piston 4 and the compression cylinder body 1 less than 5%, further reducing the clearance volume and improving the compression efficiency; the non-metallic anti-collision portion 8 is arranged at the front end of the compression piston 4, which can prevent the compression piston 4 from directly colliding with the inner wall of the compression cylinder body 1, protect the compression piston 4, avoid collision and deformation of the compression piston 4, and ensure the operation accuracy of the compression piston 4 and the sealing performance of the sealing ring 5; the non-metallic guide portion 10 can replace the previous guide belt, guide the reciprocating motion of the compression piston 4, and make the operation of the compression piston 4 more stable.

[0030] The above-mentioned specific implementation manner cannot be used as a limitation on the protection scope of the present utility model. For those skilled in the art, any replacement, improvement or change made to the implementation manner of the present utility model falls within the protection scope of the present utility model.

[0031] The matters not described in detail in the present invention are all known technologies to those skilled in the art.

Claims

1. An anti-collision compression cylinder with reduced clearance volume, comprising a compression cylinder body, a liquid inlet and a liquid outlet are provided on the compression cylinder body, a compression piston is provided in the compression cylinder body, a plurality of sealing rings are provided on the outer surface of the compression piston, and one end of the compression piston is connected to a piston rod, characterized in that: A protrusion is provided at the center of the end surface of the other end of the compression piston, and the protrusion is used to extend into the liquid inlet to reduce the clearance volume of the liquid inlet. A non-metallic anti-collision portion is provided on the end surface of the compression piston outside the protrusion, and the non-metallic anti-collision portion is used to reduce the clearance volume in the compression cylinder body and prevent the front end of the compression piston from colliding with the compression cylinder body. When the piston rod is fully extended, the clearance volume between the front end of the compression piston and the compression cylinder body is less than 5%.

2. The anti-collision compression cylinder with reduced clearance volume according to claim 1, characterized in that: The front end surface of the compression piston is a conical surface, the non-metallic anti-collision part is a conical body matched with the conical surface, and a conical hole matched with the conical body is arranged in the compression cylinder body.

3. The anti-collision compression cylinder with reduced clearance volume according to claim 1, characterized in that: The non-metallic anti-collision part is compositely connected with the compression piston through vulcanization or injection molding.

4. The anti-collision compression cylinder with reduced clearance volume according to claim 1, characterized in that: A non-metallic guide portion is provided on the side surface of the front end of the compression piston. The non-metallic guide portion is used to guide the reciprocating motion of the compression piston. The non-metallic guide portion and the non-metallic anti-collision portion are integrally formed.

5. The anti-collision compression cylinder with reduced clearance volume according to claim 4, characterized in that: The non-metallic guide part is compositely connected with the compression piston through vulcanization or injection molding.

6. The anti-collision compression cylinder with reduced clearance volume according to claim 4, characterized in that: The outer surface of the non-metallic guide portion is slightly higher than the outer surface of the compression piston.

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