Sealing structure and method of high-pressure gas injection compressor and high-pressure gas injection compressor

Abstract

The sealing structure comprises a pressure valve cover, a pressure bearing cylinder and a metal ring gasket, the pressure valve cover is used for being arranged on an air valve, the end face of one end of the pressure valve cover is an annular extrusion face, and the extrusion face is a convex conical face; the pressure-bearing barrel is used for being arranged on the air cylinder, the end face of one end of the pressure-bearing barrel is an annular pressure-bearing face, and the pressure-bearing face is a concave conical face matched with the extrusion face; the ring surface of the metal ring gasket is conical, and the inner diameter of the metal ring gasket is larger than or equal to the inner diameters of the extrusion surface and the pressure-bearing surface; when the air cylinder is connected with the air valve, the extrusion surface and the pressure-bearing surface are in indirect contact, extrusion and sealing through the metal ring gasket. The problem that the thickness of the cylinder wall of the compressor cannot be further reduced due to an existing sealing structure can be solved.

Description

Technical Field

[0001] The present invention relates to the technical field of sealing of reciprocating compressor high-pressure cylinders and intake and exhaust valves, and particularly relates to a sealing structure, method and high-pressure gas injection compressor of a high-pressure gas injection compressor. Background Art

[0002] The air valve of a reciprocating high-pressure compressor is fixedly connected to the cylinder through a valve pressing cover and a valve cover. An annular gasket is provided between the air valve and the cylinder. The sealing between the cylinder and the air valve is achieved by pressing the gasket. The performance of the gasket is a key factor affecting the working performance of the air valve. Under the continuous working state of the compressor for a long time, the intake and exhaust states of the air valve are constantly changing. It is necessary to ensure both reliable sealing performance and its own strength. If there are problems with the sealing performance or strength of the gasket, it will bring serious adverse consequences to the operation of the compressor.

[0003] The existing gasket is a flat gasket. To ensure the sealing effect, it is necessary to ensure that the gasket reaches a certain width, resulting in a relatively large projected diameter. To match this gasket, the opening diameter inside the cylinder is passively increased, and the increase in the opening diameter leads to an increase in the wall thickness of the compressor cylinder.

[0004] However, considering actual requirements, reciprocating compressors require more miniaturization and compact structure. The relatively thick wall thickness of the compressor cylinder directly limits the lower limit of miniaturization, and the wall thickness is restricted by the width of the gasket. To achieve good enough sealing performance, it is inevitable to limit the minimum value of the width of the gasket, and then inevitably limit the minimum value of the wall thickness of the compressor cylinder, thereby restricting the lower limit of miniaturization of the reciprocating compressor and forming a design dead loop. Summary of the Invention

[0005] The purpose of the present invention is to provide a sealing structure of a high-pressure gas injection compressor, so as to solve the problem that the existing sealing structure causes the wall thickness of the compressor cylinder to be unable to be further reduced.

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

[0007] A sealing structure of a high-pressure gas injection compressor, comprising: a valve pressing cover, the valve pressing cover is cylindrical, the valve pressing cover is used to be arranged on the air valve, one end face of the valve pressing cover is an annular extrusion surface, and the extrusion surface is a convex conical surface; a pressure-bearing cylinder, the pressure-bearing cylinder is used to be arranged on the cylinder, one end face of the pressure-bearing cylinder is an annular pressure-bearing surface, and the pressure-bearing surface is a concave conical surface matching the extrusion surface; a metal ring gasket, the ring surface of the metal ring gasket is conical, the inner diameter of the metal ring gasket > the inner diameters of the extrusion surface and the pressure-bearing surface, and the outer diameter of the metal ring gasket < the outer diameters of the extrusion surface and the pressure-bearing surface; when the cylinder is connected to the air valve, the extrusion surface and the pressure-bearing surface are indirectly contacted, extruded and sealed through the metal ring gasket.

[0008] Optionally, the taper angles of the extrusion surface and the pressure-bearing surface > the taper angle of the metal ring gasket.

[0009] Optionally, the taper angles of the extrusion surface and the pressure-bearing surface > the taper angle of the metal ring gasket.

[0010] Optionally, the taper angles of both the extrusion surface and the pressure-bearing surface are 110°, and the taper angle of the metal ring gasket is 90°.

[0011] Optionally, the material of the metal ring gasket is low-carbon steel.

[0012] Optionally, the material of the metal ring gasket is 10# steel or 20# steel.

[0013] Optionally, the materials of the pressure valve cover and the pressure-bearing cylinder are chrome molybdenum steel or chrome nickel molybdenum steel.

[0014] Optionally, the materials of the pressure valve cover and the pressure-bearing cylinder are any one of 40CrNiMo, 42CrMo, and 35CrMo.

[0015] An installation method for the sealing structure of any one of the above high-pressure gas injection compressors includes the following steps:

[0016] Vertically arrange the pressure-bearing cylinder and make the pressure-bearing surface face vertically upward;

[0017] Coaxially place the metal ring gasket on the pressure-bearing surface;

[0018] Coaxially install the pressure valve cover above the pressure-bearing cylinder and make the extrusion surface face vertically downward;

[0019] Press down the pressure valve cover so that the extrusion surface presses down the metal ring gasket until the extrusion surface and the pressure-bearing surface are in indirect contact and pressed tightly through the metal ring gasket, so as to cold work harden the metal ring gasket and expand the taper angle of the metal ring gasket from the initial taper angle to the end taper angle;

[0020] Wherein:

[0021] The initial taper angle < the end taper angle;

[0022] The taper angles of both the extrusion surface and the pressure-bearing surface are the end taper angle.

[0023] A high-pressure gas injection compressor includes a gas valve, a cylinder, and the sealing structure of any one of the above high-pressure gas injection compressors; the pressure valve cover is arranged at the exhaust end of the gas valve; the pressure-bearing cylinder is arranged at the intake end or the exhaust end of the cylinder; when the gas valve is connected to the cylinder, the pressure valve cover and the pressure-bearing cylinder are coaxially arranged, and the metal ring gasket is squeezed and coaxially clamped between the extrusion surface and the pressure-bearing surface.

[0024] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0025] A sealing structure of a high-pressure gas injection compressor provided by the present invention, by setting a pressure valve cover and a pressure-bearing cylinder, respectively setting a basic structure of airtight connection with the air valve and the cylinder. On this basis, by setting an extrusion surface, a pressure-bearing surface and a metal ring gasket, and setting all three to be conical surfaces, the width of the sealing ring surface is increased by using the conical surface structure, so as to ensure the sealing performance, and make the projected width of the seal smaller, and then the required opening diameter of the cylinder is smaller, so that the cylinder wall thickness can be designed to be thinner on the premise of ensuring the sealing performance; through the mutual cooperation of the above features, the sealing structure of the high-pressure gas injection compressor can effectively solve the problem that the existing sealing structure causes the cylinder wall thickness of the compressor to be unable to be further reduced, so that the gas injection compressor can be miniaturized and compacted. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The drawings described herein are used to provide a further understanding of the embodiments of the present invention, form a part of this application, and do not limit the embodiments of the present invention. In the drawings:

[0027] Figure 1 is a schematic diagram of the sealing structure of the high-pressure gas injection compressor provided in Embodiment 1 of the present invention;

[0028] Figure 2 is a side-sectional view of the metal ring gasket of the sealing structure of the high-pressure gas injection compressor provided in Embodiment 1 of the present invention;

[0029] Figure 3 is a flowchart of the installation method of the sealing structure of the high-pressure gas injection compressor provided in Embodiment 2 of the present invention;

[0030] Figure 4 is a sectional view of the gas injection compressor provided in Embodiment 3 of the present invention.

[0031] Marks in the drawings and corresponding component names:

[0032] 1 - air valve; 2 - cylinder; 10 - pressure valve cover; 11 - extrusion surface; 20 - pressure-bearing cylinder; 21 - pressure-bearing surface; 30 - metal ring gasket. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0033] To make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below with reference to the embodiments and the drawings. The illustrative embodiments and descriptions of the present invention are only used to explain the present invention and do not limit the present invention.

[0034] Example 1

[0035] Please refer to Figure 1 andFigure 2 , this embodiment provides a sealing structure for a high-pressure gas injection compressor, including: a pressure valve cover 10, the pressure valve cover 10 is cylindrical, the pressure valve cover 10 is used to be arranged on the gas valve, one end face of the pressure valve cover 10 is an annular extrusion surface 11, and the extrusion surface 11 is a convex conical surface; Second, it includes a pressure-bearing cylinder 20, the pressure-bearing cylinder 20 is used to be arranged on the cylinder, one end face of the pressure-bearing cylinder 20 is an annular pressure-bearing surface 21, and the pressure-bearing surface 21 is a concave conical surface matching the extrusion surface 11; Third, it includes a metal ring gasket 30, the ring surface of the metal ring gasket 30 is conical, the inner diameter of the metal ring gasket 30 > the inner diameters of the extrusion surface 11 and the pressure-bearing surface 21, and the outer diameter of the metal ring gasket 30 < the outer diameters of the extrusion surface 11 and the pressure-bearing surface 12; When the cylinder is connected to the gas valve, the extrusion surface 11 and the pressure-bearing surface 21 are indirectly contacted, extruded and sealed through the metal ring gasket 30.

[0036] A sealing structure for a high-pressure gas injection compressor provided by the present invention, by setting the pressure valve cover 10 and the pressure-bearing cylinder 20, respectively setting a basic structure for airtight connection on the gas valve and the cylinder. On this basis, by setting the extrusion surface 11, the pressure-bearing surface 21 and the metal ring gasket 30, and setting all three to be conical surfaces, the width of the sealing ring surface is increased by using the conical surface structure, so as to ensure the sealing performance, and make the projected width of the seal smaller, and then the required opening diameter of the cylinder is smaller, so that the cylinder wall thickness can be designed thinner on the premise of ensuring the sealing performance; Through the mutual cooperation of the above-mentioned features, the sealing structure of the high-pressure gas injection compressor can effectively solve the problem that the existing sealing structure causes the cylinder wall thickness of the compressor to be unable to be further reduced, so that the gas injection compressor can be miniaturized and compacted.

[0037] In order to improve the sealing effect and structural strength of the metal ring gasket 30, the cone angles of the extrusion surface 11 and the pressure-bearing surface 21 > the cone angle of the metal ring gasket 30.

[0038] Through the above settings, during the installation process, both sides of the metal ring gasket 30 bear the extrusion of the extrusion surface 11 and the pressure-bearing surface 21 respectively. Since the cone angles of both are greater than the cone angle of the metal ring gasket 30, as the extrusion surface 11 and the pressure-bearing surface 21 get closer and closer, the metal ring gasket 30 gradually deforms, so as to carry out cold work hardening at room temperature, thereby improving the strength and maximum pre-tightening force of the metal ring gasket 30, that is, improving the contact force between the surface of the metal ring gasket 30 and the extrusion surface 11 and the pressure-bearing surface 21.

[0039] Preferably, the cone angles of the extrusion surface 11 and the pressure-bearing surface 21 are the same, and are 100-120°, and the cone angle of the metal ring gasket 30 is 85-95°.

[0040] Further preferably, the cone angles of the extrusion surface 11 and the pressure-bearing surface 21 are both 110°, and the cone angle of the metal ring gasket 30 is 90°.

[0041] In order to ensure the sealing performance while enabling the metal ring gasket 30 to be successfully cold-work hardened, the material of the metal ring gasket 30 is low-carbon steel.

[0042] Preferably, the material of the metal ring gasket 30 is 10# steel or 20# steel.

[0043] In order to ensure the structural performance and compressive resistance of the pressure valve cover 10 and the pressure-bearing cylinder 20, the materials of the pressure valve cover 10 and the pressure-bearing cylinder 20 are chrome molybdenum steel or chrome nickel molybdenum steel.

[0044] Preferably, the materials of the pressure valve cover 10 and the pressure-bearing cylinder 20 are any one of 40CrNiMo, 42CrMo, and 35CrMo.

[0045] Example 2

[0046] Please refer to the basis of Embodiment 1 Figure 3 , this embodiment provides an installation method for the sealing structure of any one of the above high-pressure gas injection compressors, including the following steps:

[0047] S1. Vertically arrange the pressure-bearing cylinder 20 and make the bearing surface 21 face vertically upward;

[0048] S2. Coaxially place the metal ring gasket 30 on the bearing surface 21;

[0049] S3. Coaxially install the pressure valve cover 10 above the pressure-bearing cylinder 20 and make the extrusion surface 11 face vertically downward;

[0050] S4. Press down the pressure valve cover 10 so that the extrusion surface 11 presses down the metal ring gasket 30 until the extrusion surface 11 and the bearing surface 21 are indirectly in contact and pressed tightly through the metal ring gasket 30 to cold-work harden the metal ring gasket 30, so that the cone angle of the metal ring gasket 30 expands from the initial cone angle to the end cone angle;

[0051] Wherein:

[0052] The initial cone angle < the end cone angle;

[0053] The cone angles of the extrusion surface 11 and the bearing surface 21 are both the end cone angle.

[0054] In this embodiment, the initial cone angle is 90° and the end cone angle is 110°.

[0055] Example 3

[0056] Please refer to the basis of Embodiment 1 Figure 4, this embodiment provides a high-pressure gas injection compressor, which includes a gas valve 1, a cylinder 2, and the sealing structure of any one of the above high-pressure gas injection compressors; the valve pressing cover 10 is arranged at the exhaust end of the gas valve 1; the pressure-bearing cylinder 20 is arranged at the intake end or the exhaust end of the cylinder 2; when the gas valve 1 is connected to the cylinder 2, the valve pressing cover 10 and the pressure-bearing cylinder 20 are coaxially arranged, and the metal ring gasket 30 is extruded and coaxially clamped between the extrusion surface 11 and the pressure-bearing surface 21.

[0057] It should be noted that in this embodiment, the valve pressing cover 10 is actually a part of the exhaust end of the gas valve 1, and the pressure-bearing cylinder 20 is a part of the intake end or the exhaust end of the cylinder 2, which is only a conceptual feature of partial extraction. Therefore, the wall thickness of the valve pressing cover 10 is the wall thickness of the gas valve 1, and the wall thickness of the pressure-bearing cylinder 20 is the thickness of the cylinder 2.

[0058] Through the above settings, when the gas valve 1 is connected to the cylinder 2, the sealing performance at the contact between the valve pressing cover 10 and the pressure-bearing cylinder 20 effectively guarantees the sealing performance between the gas valve 1 and the cylinder 2. In this embodiment, under the same design parameters with a design pressure of 61 MPa, when a flat gasket is used for the same sealing area, the diameter of the pressure-bearing cylinder 20 is φ85.2 mm, while adopting the structure of this embodiment can reduce the diameter of the pressure-bearing cylinder 20 by 1.46 mm, reduce the wall thickness by 0.3 mm, and reduce the required axial pre-tightening force by 18.1%.

[0059] The specific embodiments described above have further elaborated on the purpose, technical solutions, and beneficial effects of the present invention. It should be understood that the above is only the specific embodiments of the present invention and is not used to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A sealing structure for a high-pressure gas injection compressor, characterized in that, it includes: A pressure valve cover (10), the pressure valve cover (10) is cylindrical, the pressure valve cover (10) is used to be arranged on the gas valve, one end face of the pressure valve cover (10) is an annular extrusion surface (11), and the extrusion surface (11) is a convex conical surface; A pressure-bearing cylinder (20), the pressure-bearing cylinder (20) is used to be arranged on the cylinder, one end face of the pressure-bearing cylinder (20) is an annular pressure-bearing surface (21), and the pressure-bearing surface (21) is a concave conical surface matching the extrusion surface (11); A metal ring gasket (30), the ring surface of the metal ring gasket (30) is conically arranged, the inner diameter of the metal ring gasket (30) > the inner diameters of the extrusion surface (11) and the pressure-bearing surface (21), and the outer diameter of the metal ring gasket (30) < the outer diameters of the extrusion surface (11) and the pressure-bearing surface (12); When the cylinder is connected to the gas valve, the extrusion surface (11) and the pressure-bearing surface (21) are indirectly contacted, extruded and sealed through the metal ring gasket (30).

2. The sealing structure of the high-pressure gas injection compressor according to claim 1, characterized in that, the cone angles of the extrusion surface (11) and the pressure-bearing surface (21) > the cone angle of the metal ring gasket (30).

3. The sealing structure of the high-pressure gas injection compressor according to claim 2, characterized in that, the cone angles of the extrusion surface (11) and the pressure-bearing surface (21) are the same and are 100 - 120°, and the cone angle of the metal ring gasket (30) is 85 - 95°.

4. The sealing structure of the high-pressure gas injection compressor according to claim 3, characterized in that, the cone angles of the extrusion surface (11) and the pressure-bearing surface (21) are both 110°, and the cone angle of the metal ring gasket (30) is 90°.

5. The sealing structure of the high-pressure gas injection compressor according to claim 1, characterized in that, the material of the metal ring gasket (30) is low-carbon steel.

6. The sealing structure of the high-pressure gas injection compressor according to claim 5, characterized in that, the material of the metal ring gasket (30) is 10# steel or 20# steel.

7. The sealing structure of the high-pressure gas injection compressor according to claim 1, characterized in that, the materials of the pressure valve cover (10) and the pressure-bearing cylinder (20) are chrome molybdenum steel or chrome nickel molybdenum steel.

8. The sealing structure of the high-pressure gas injection compressor according to claim 7, characterized in that, the materials of the pressure valve cover (10) and the pressure-bearing cylinder (20) are any one of 40CrNiMo, 42CrMo and 35CrMo.

9. An installation method for the sealing structure of a high-pressure gas injection compressor according to any one of claims 1 - 8, characterized in that, it includes the following steps: Vertically arrange the pressure-bearing cylinder (20) and make the pressure-bearing surface (21) face vertically upward; Coaxially place the metal ring gasket (30) on the pressure-bearing surface (21); Coaxially arrange the pressure valve cover (10) above the pressure-bearing cylinder (20) and make the extrusion surface (11) face vertically downward; Press down the pressure valve cover (10) so that the extrusion surface (11) presses down the metal ring gasket (30) until the extrusion surface (11) and the pressure-bearing surface (21) are in indirect contact and pressed tightly through the metal ring gasket (30), so as to perform cold working hardening on the metal ring gasket (30), so that the cone angle of the metal ring gasket (30) expands from the initial cone angle to the end cone angle; Wherein: The initial cone angle < the end cone angle; The cone angles of the extrusion surface (11) and the pressure-bearing surface (21) are both the end cone angles.

10. A high-pressure gas injection compressor, Characterized in that, It includes a gas valve (1), a cylinder (2) and a sealing structure of the high-pressure gas injection compressor according to any one of claims 1-8; The pressure valve cover (10) is arranged at the exhaust end of the gas valve (1); The pressure-bearing cylinder (20) is arranged at the intake end or the exhaust end of the cylinder (2); When the gas valve (1) is connected to the cylinder (2), the pressure valve cover (10) and the pressure-bearing cylinder (20) are coaxially arranged, and the metal ring gasket (30) is extruded and coaxially clamped between the extrusion surface (11) and the pressure-bearing surface (21).

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