Compressor

Abstract

To provide a compressor capable of suppressing labor required for maintenance even when seals are arranged in multiple stages.SOLUTION: A compressor comprises: a cylinder 81; a piston 21 that reciprocates inside the cylinder 81; seals 41, 42 fitted into the piston 21; a crimp ring 71 arranged so as to surround the piston 21; and fixtures 61, 62 arranged apart from the seals 41, 42. The fixtures 61, 62 are divided around an axis of the piston 21. The fixtures 61, 62 have a housing groove 64 for fitting the crimp ring 71. The fixtures 61, 62 are fitted into holding grooves 27, 35 formed in the piston 21. By dividing the fixtures 61, 62 around the axis, the seals 41, 42 can be easily attached and detached, thereby reducing labor required for maintenance.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a compressor using a reciprocating mechanism composed of a cylinder and a piston. [Background technology]

[0002] In compressor sealing materials, the use of multiple annular seal groups has been proposed to enable space saving and long life (for example, Patent Document 1). In this publication, a first annular seal group and a second annular seal group are arranged separately. Both seal groups are fixed by nuts threaded onto the piston rod. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2023-43980 Summary of the Invention [Problem to be solved by the invention]

[0004] The use of multiple seals in a compressor increases the amount of work required for maintenance. An object of the present invention is to provide a compressor that can reduce the amount of work required for maintenance even when the seals are multiple. [Means for solving the problem]

[0005] A first aspect of the present invention is A cylinder; A piston that reciprocates inside the cylinder; A seal fitted to the piston; a crimp ring disposed to surround the piston; a fastener disposed away from the seal, divided in a direction around the axis of the piston, having an accommodating groove for accommodating the crimping ring, the fastener fitting into a retaining groove formed in the piston; The compressor includes:

[0006] A plurality of sets of seals and fasteners may be arranged along the axial direction of the piston.

[0007] The inner peripheral surface of the fixture may have a step with a different inner diameter. Corresponding to this step, the piston is provided with a flange that fits into the step. The fit between the step and the flange restricts movement of the fixture relative to the piston. The flange may be provided at the tip of the piston.

[0008] The fixture may have a flow passage for passing a fluid between both end faces. The flow passage may be, for example, a hole or a groove. The fluid compressed by the movement of the piston can pass through the fixture via the flow passage and move from the high-pressure side to the low-pressure side.

[0009] The crimping ring may be C-shaped with a break, the extension direction of which may be inclined with respect to the axis of the piston. The crimp ring may be a rider ring, which contacts the cylinder and can transmit the weight of the piston. [Effects of the Invention]

[0010] According to the compressor of the present invention, the seals can be easily attached and detached, and even when the seals are arranged in multiple stages, the labor required for maintenance can be reduced. [Brief explanation of the drawings]

[0011] [Figure 1] 1 is a cross-sectional view of a compressor according to a first embodiment; [Figure 2] FIG. 10 is a perspective view of a second fixture disposed on the tip side of the piston; [Figure 3] Cross-sectional view showing the process of fixing the first seal to the piston [Figure 4] Cross-sectional view showing the process of fixing the second seal to the piston [Figure 5] FIG. 10 is a perspective view of a first fixing device according to a second embodiment; [Figure 6] FIG. 6 is a perspective view of the first fixture of FIG. 5 fitted into the first holding groove; DETAILED DESCRIPTION OF THE INVENTION

[0012] First Embodiment As shown in Fig. 1, the compressor 11 of this embodiment includes a cylinder 81, a piston 21, a sliding member 39, a first backup ring 51, a first seal 41, a first top ring 53, a first fixing member 61, a bottom ring 55, a second backup ring 57, a second seal 42, a second top ring 59, a second fixing member 62, and a crimp ring 71. The piston 21 reciprocates within the cylinder 81. The right side of the figure is the tip side of the piston 21. Compression chambers that compress various fluids are formed on the tip side of the piston 21.

[0013] The first seal 41 is sandwiched between the first backup ring 51 and the first top ring 53. The second seal 42 is sandwiched between the second backup ring 57 and the second top ring 59. The first backup ring 51 prevents the first seal 41 from deforming when fluid is pressurized. The first top ring 53 prevents contact between the first seal 41 and the first fixture 61. The second backup ring 57 and the second top ring 59 have the same functions.

[0014] The piston 21 has the largest diameter at the base portion 23 on the left side of the figure, and from there toward the tip of the piston 21, multiple sections of different outer diameters are formed, each with a name. These names, from the base portion 23 toward the tip of the piston 21, are the first seal receiving portion 25, first retaining groove 27, second seal receiving portion 29, inclined portion 31, intermediate portion 33, second retaining groove 35, and flange portion 37. An annular sliding member 39 is fitted onto the outer peripheral surface of the base portion 23. The sliding member 39 comes into contact with the cylinder 71.

[0015] A flange surface 24 is formed at the boundary between the root portion 23 and the first seal receiving portion 25 due to the difference in outer diameter. A first backup ring 51, a first seal 41, and a first top ring 53 are fitted into the first seal receiving portion 25. The first backup ring 51 comes into contact with the flange surface 24, thereby restricting movement of the first backup ring 51 toward the root portion 23. The first seal 41 is sandwiched between the first backup ring 51 and the first top ring 53.

[0016] The extension of the first seal receiving portion 25 (extension in the axial direction of the piston 21) is equal to the thickness of the first backup ring 51, the first seal 41, and the first top ring 53 when they are lined up without any gaps. When the first backup ring 51, the first seal 41, and the first top ring 53 are fitted into the first seal receiving portion 25 without any gaps, the end face of the first top ring 53 is located at the boundary between the first seal receiving portion 25 and the first retaining groove 27.

[0017] The first retaining groove 27 is sandwiched between the first seal receiving portion 25 and the second seal receiving portion 29, and has a smaller diameter than the first seal receiving portion 25 and the second seal receiving portion 29. A first fixing device 61 is fitted into the first retaining groove 27. The first fixing device 61 is cylindrical and surrounds the first retaining groove 27, but is divided into two when viewed from a direction perpendicular to the axis of the piston 21. The divided first fixing device 61 is fitted into the first retaining groove 27 from the outer periphery side of the piston 21. The first retaining groove 27 and the first fixing device 61 have the same length in the axial direction of the piston 21.

[0018] The first fixing device 61 has an annular housing groove 64 on its outer circumferential surface. A crimping ring 71 is fitted into the housing groove 64. The crimping ring 71 is made of a plate material formed into a cylindrical shape and is fitted so as to surround the first fixing device 61. When the crimping ring 71 is fitted into the housing groove 64, it is elastically deformed in the radially expanding direction. By fitting the crimping ring 71, the first fixing device 61 is urged toward the center of the piston 21. Protrusions 65 are formed on both side surfaces of the housing groove 64. The protrusions 65 prevent the crimping ring 71 from falling off.

[0019] A bottom ring 55, a second backup ring 57, and a second seal 42 are fitted into the second seal receiving portion 29. The second seal 42 is identical to the second seal 41. The bottom ring 55 comes into contact with the first fixing member 61, and movement toward the base portion 23 is restricted.

[0020] As viewed from the second seal receiving portion 29, the piston 21 has an inclined portion 31, the outer diameter of which gradually changes, toward the tip end of the piston 21. The outer diameter of the inclined portion 31 decreases toward the tip end of the piston 21. As viewed from the inclined portion 31, the piston 21 has an intermediate portion 33, the outer diameter of which is constant, toward the tip end. A second top ring 59 is fitted into the section consisting of the inclined portion 31 and the intermediate portion 33.

[0021] The second retaining groove 35 has a smaller diameter than the intermediate portion 33. The second retaining groove 35 has a flange portion 37 on the tip side. A second fixing device 62 is fitted into the second retaining groove 35. The second fixing device 62 is divided into two parts like the first fixing device 61, and is fitted into the second retaining groove 35 from the outer periphery side of the piston 21.

[0022] The inner circumferential surface of the second fixing device 62 has a step 67 with an enlarged inner diameter on the tip side of the piston 21. The flange 37 of the piston 21 fits into the step 67. The second fixing device 62 is sandwiched between the intermediate portion 33 and the flange 37, and the movement of the piston 21 in the axial direction is restricted.

[0023] 2 shows the details of the second fixture 62 arranged on the tip side of the piston 21. The second fixture 62 is not annular but is divided into two parts. The second fixture 62 is fitted into the second retaining groove 35 from the outer periphery side of the piston 21. The flange 37 of the piston 21 fits into a step 67 on the inner periphery of the second fixture 62.

[0024] When the second fixtures 62 are fitted into the second holding grooves 35, a gap is formed at the boundary between the opposing second fixtures 62. This gap functions as a flow path 68 for the fluid compressed by the piston 21. By providing the flow path 68, the fluid passes through the second fixtures 62 when compressed, eliminating the pressure difference between the tip and base sides of the piston 21.

[0025] The crimping ring 71 is not an unbroken ring, but rather has a C-shape with a break portion 73 in a side view. The crimping ring 71 is elastically deformed to expand the break portion 73 and fitted into the accommodation groove 64. After fitting, the crimping ring 71 urges the second fasteners 62 toward the center of the piston 21 due to the reaction force of the elastic deformation. The crimping ring 71 makes it impossible for the two second fasteners 62 to detach from the piston 21. The spacing between the break portions 73 is narrowed to reduce the non-contact area between the crimping ring 71 and the cylinder 81.

[0026] 3 shows the process up to fixing the first seal 41 to the piston 21. A first backup ring 51, the first seal 41, and a first top ring 53 are arranged in the first seal receiving portion 25. The first backup ring 51 and the first top ring 53 sandwich the first seal 41. The end face of the first backup ring 51 is brought into contact with the flange surface 24 at the boundary between the root portion 23 and the first seal receiving portion 25.

[0027] The first fastener 61 fitted into the first retaining groove 27 comes into contact with the first top ring 53. The first backup ring 51, the first seal 41, and the first top ring 53 are sandwiched between the first fastener 61 and the flange surface 24. After the first fastener 61 is fitted into the first retaining groove 27, a crimp ring 71 is fitted into the accommodation groove 64, thereby making it impossible for the first fastener 61 to be detached from the piston 21.

[0028] 4 shows the process of fixing the second seal 42 to the piston 21. A bottom ring 55, a second backup ring 57, the second seal 42, and a second top ring 59 are arranged in the section from the second seal receiving portion 29 to the intermediate portion 33. The second backup ring 57 and the second top ring 59 sandwich the second seal 42. The end face of the second top ring 59 is aligned with the boundary between the intermediate portion 33 and the second retaining groove 35.

[0029] A second fixing device 62 is fitted into the second retaining groove 35. A bottom ring 55, a second backup ring 57, a second seal 42, and a second top ring 59 are sandwiched between the first fixing device 61 and the second fixing device 62. The second seal 42 is restricted from moving in the axial direction of the piston 21. After the second fixing device 62 is fitted into the second retaining groove 35, a crimping ring 71 is fitted into the accommodation groove 64, thereby making it impossible for the second fixing device 62 to be detached from the piston 21.

[0030] The first seal 41 and the second seal 42 are fixed to the piston 21 by the first fixing device 61 and the second fixing device 62. The crimp ring 71 contacts the cylinder 81 and functions as a rider ring. The first fixing device 61 and the second fixing device 62 are fitted into the first retaining groove 27 and the second retaining groove 35, respectively, to restrict the movement of the piston 21 in the axial direction and transmit the load caused by the compression of the fluid to the piston 21.

[0031] The outer circumferential surfaces of the first seal 41 and the second seal 42 contact the inner circumferential surface of the cylinder 81 to ensure sealing when the fluid is compressed. The configuration and materials of the first seal 41 and the second seal 42 are determined according to the type of fluid to be compressed and the pressure acting on them. In the figure, the seal is configured with two stages, the first seal 41 and the second seal 42, but this can be increased to three or more stages to improve sealing when the fluid is compressed.

[0032] During maintenance, when removing the parts fitted to the piston 21, the crimp ring 71 is first expanded and removed, and then the first fastener 61 and the second fastener 62 are moved in the radial direction of the piston 21. After that, the first top ring 53 and other parts in contact with the first fastener 61 can move in the axial direction of the piston 21, facilitating replacement of the first seal 41 and the second seal 42. The outer diameters of the first retaining groove 27 and the second retaining groove 35 are smaller than the inner diameters of the first seal 41 and the second seal 42, and do not hinder their movement.

[0033] Second Embodiment As shown in Fig. 5, the first fixture 161 of this embodiment has a flow path 69 therein. The flow path 69 is composed of holes that penetrate both end faces of the first fixture 161 and grooves that are provided on both end faces of the first fixture 161. Both ends of the flow path 69 reach the outer circumferential surface of the first fixture 161. Even if the end faces of the first fixture 161 are blocked after the first fixture 161 is fitted to the piston 21, the flow path 69 will not be blocked. The first fixture 161 is fitted into the first retaining groove 27, similar to the first fixture 61 of Fig. 1.

[0034] 6 shows a state in which the first fixture 161 of FIG. 5 is fitted into the piston 21. The opposing first fixtures 161 form an unbroken ring. The flow passages 69 open at both ends of the first fixture 161.

[0035] The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope of the gist of the present invention, and all technical matters included in the technical ideas described in the claims are the subject of the present invention. The above-described embodiments are preferred examples, but a person skilled in the art can realize various alternatives, modifications, variations, or improvements from the contents of the disclosure of this specification, and these are included in the technical scope described in the appended claims. [Explanation of symbols]

[0036] 11 Compressor 21 Piston 23 Root part 24 Flange surface 25 First seal receiving part 27 1st retaining groove 29 Second seal receiving part 31 Slope 33 Middle section 35 2nd retaining groove 37 Tsuba 39 Sliding material 41 First Seal 42 Second Seal 51 First backup ring 53 First Top Ring 55 Bottom Ring 57 Second backup ring 59 Second Top Ring 61, 161 1st fixture 62 Second fixture 64 Storage groove 65 Convex part 67 Steps 68 Flow path 69 Flow path 71 Crimping ring 73 Breaking part 81 cylinders

Claims

1. A cylinder; a piston that reciprocates inside the cylinder; a seal fitted to the piston; a crimping ring disposed around the piston; a fixing member disposed apart from the seal, divided in a direction around the axis of the piston, having an accommodating groove into which the crimping ring is fitted, the fixing member fitting into a retaining groove formed in the piston; Including, a compressor.

2. The compressor according to claim 1 , wherein a plurality of sets of the seal and the fixing device are arranged along the axial direction of the cylinder.

3. 3. The compressor according to claim 1, wherein the inner peripheral surface of the fixing member has a step with a different inner diameter, and the piston has a flange that fits into the step.

4. The compressor according to any one of claims 1 to 3, wherein the fixing member has a flow path for passing a fluid between both end faces thereof.

5. The compressor according to any one of claims 1 to 4, wherein the crimping ring is C-shaped with a break.

6. The compressor according to any one of claims 1 to 5, wherein the crimp ring is a rider ring.

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