Compressor

Abstract

To provide a compressor capable of suppressing excessive stress in a flow passage even when the flow passage connecting a cylinder chamber and the outside is exposed to high pressure.SOLUTION: A compressor includes a cylinder 21 having a cylinder chamber 31, a piston 27 reciprocating inside the cylinder 21, and a head cover 41 closing one end surface of the cylinder 21. The head cover 41 has a flow passage 51 which includes an inner section 52 opened to the cylinder chamber 31, and an outer section 54 connected with the inner section 52 and opened to a side surface of the head cover 41. An angle formed by the inner section 52 and the outer section 54 is obtuse, and therefore, sharpness of an edge formed at an intersection of the inner section 52 and the outer section 54 is moderated, and excessive stress can be suppressed.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a compressor used to compress a fluid such as hydrogen. [Background technology]

[0002] A reciprocating compressor has been proposed in which the end face of the cylinder is blocked by a block, and the block has an intake valve and a discharge valve inside, with a gas inlet and outlet on the opposite side of the compression chamber across the block (Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2006-52709 Summary of the Invention [Problem to be solved by the invention]

[0004] When a flow passage is formed along the direction of piston movement, as in the block disclosed in Patent Document 1, the block may be deformed by the pressure in the compression chamber, causing excessive stress on the inner circumferential surface of the flow passage. Also, the high pressure acting on the flow passage may cause excessive stress in a specific area. The present invention provides a compressor that can prevent excessive stress in the flow path connecting the cylinder chamber and the outside, even when the flow path is exposed to high pressure. [Means for solving the problem]

[0005] A first aspect of the present invention is a cylinder having a cylinder chamber; a piston that reciprocates inside the cylinder; A head cover that closes one end face of the cylinder, a flow path including an inner section that opens into the cylinder chamber and an outer section that is connected to the inner section and opens to a side surface of the head cover; Head cover and It is a compressor equipped with.

[0006] There may be multiple sets of flow paths. The angle between the inner section and the outer section may be an obtuse angle.

[0007] In the flow path, either the inner section or the outer section may have a curved bottom surface, and the other of the inner section and the outer section may be open to the bottom surface. The curved surface constituting the bottom surface may be hemispherical or may have a parabolic cross section.

[0008] The flow path may have different inner diameters in the inner section and the outer section. In this case, the section with the larger inner diameter may have a curved bottom, and the section with the smaller inner diameter may be open to the bottom. The curved bottom may have a hemispherical or parabolic cross section.

[0009] A curved section may be provided between the inner section and the outer section.

[0010] The flow path may have multiple outer sections connected to a single inner section.

[0011] The cylinder chamber is the space where the fluid is compressed. A part of the head cover can be fitted inside the cylinder. The piston drive system can be selected from hydraulics, electric motors, etc.

[0012] The flow passages are formed inside the head cover. The flow passages may include an intake passage and an exhaust passage. The intake passage and the exhaust passage may be provided separately. Increasing the number of flow passages can increase the flow rate. One end of each flow passage opens into the cylinder chamber, and the other end opens to the side surface of the head cover. The side surface of the head cover refers to the surface on each surface of the head cover that extends generally along the direction of piston movement.

[0013] Each flow path has a different extension direction at one end and the other end. In each flow path, the side that opens into the cylinder chamber is called the inner section, while the side that opens into the side of the head cover is called the outer section. The bottoms of the inner section and outer section are connected to each other.

[0014] The inner section can extend in any direction, even inclined relative to the direction of piston movement. The outer section can extend perpendicular to the direction of piston movement or inclined relative to the direction of piston movement. [Effects of the Invention]

[0015] According to the compressor of the present invention, even when the flow passage provided in the head cover is exposed to high pressure, it is possible to prevent excessive stress in the flow passage. [Brief explanation of the drawings]

[0016] [Figure 1] FIG. 1 is a perspective view of a compressor according to a first embodiment; [Figure 2] A perspective view of the head cover in Figure 1 turned upside down. [Figure 3] Cross section of line II in Figure 2 [Figure 4] Cross section of line II-II in Figure 2 [Figure 5] Assembly diagram of Figure 1 [Figure 6] FIG. 10 is a perspective view of a head cover according to a second embodiment; [Figure 7] FIG. 7 is a perspective view showing the flow path of the head cover of FIG. [Figure 8] FIG. 10 is a perspective view of a head cover according to a third embodiment; [Figure 9] Cross section of line III-III in Figure 8 [Figure 10] FIG. 10 is a perspective view of a head cover according to a fourth embodiment; DETAILED DESCRIPTION OF THE INVENTION

[0017] First Embodiment As shown in FIG. 1 , a compressor 10 of this embodiment includes a drive unit 11, a drive rod 17, a base plate 13, a piston 27, a cylinder 21, a jacket 23, a head cover 41, a tie rod 15, a joint 33, and a check valve 59. The piston 27 reciprocates inside the cylinder 21. A seal 29 is disposed on the outer circumferential surface of the piston 27. The drive unit 11 uses hydraulic pressure or the like as a power source to power the reciprocating motion of the piston 27. The piston 27 and the drive unit 11 are connected via the drive rod 17. The cylinder 21 and the jacket 23 are mounted on the surface of the base plate 13.

[0018] The head cover 41 has a flange portion 43 and a fitting portion 45. The flange portion 43 closes the end faces of the cylinder 21 and the jacket 23. The fitting portion 45 protrudes from one end face side of the flange portion 43. The fitting portion 45 is fitted into the inner circumferential surface of the cylinder 21. The space defined by the cylinder 21, the piston 27, and the head cover 41 is the cylinder chamber 31. The fluid to be compressed is, for example, hydrogen.

[0019] A seal 47 is disposed in the fitting portion 45. The seal 47 seals the gap between the cylinder 21 and the head cover 41. Coolant is supplied between the cylinder 21 and the jacket 23. The jacket 23 has a connection port 25. A fitting 33 is attached to the connection port 25. The fitting 33 serves as an inlet and an outlet for the coolant.

[0020] The head cover 41 includes a flow path 51. The flow path 51 has an inner section 52 and an outer section 54. The inner section 52 opens to the cylinder chamber 31. The outer section 54 opens to the side surface of the head cover 41. The bottoms of the inner section 52 and the outer section 54 are connected to each other. A connection port 56 is provided at the end of the outer section 54. The connection port 56 is located on the side surface of the head cover 41. A check valve 59 or the like may be attached to the connection port 56.

[0021] The inner section 52 extends at an angle relative to the direction of movement of the piston 27. The outer section 54 extends perpendicular to the direction of movement of the piston 27. The angle θ formed by the inner section 52 and the outer section 54 is an obtuse angle exceeding 90 degrees. In the figure, two sets of flow paths 51 are provided to separate the intake and discharge of fluid.

[0022] The tie rod 15 extends in a direction connecting the base plate 13 and the head cover 41. One end of the tie rod 15 is integrated with the base plate 13. The other end is inserted into a fixing hole 57 in the head cover 41. A nut 16 is screwed onto the tie rod 15 protruding from the fixing hole 57, and the head cover 41 is brought into close contact with the cylinder 21.

[0023] Figure 2 shows the details of the head cover 41 in Figure 1. In Figure 2, the head cover 41 is turned upside down compared to Figure 1. The fitting portion 45 has a circular cross section that fits into the inner circumferential surface of the cylinder 21. Two sets of flow paths 51 open on the end face of the fitting portion 45. The flange portion 43 is rectangular. The flow paths 51 open on the side surface of the flange portion 43.

[0024] Figure 3 is a cross-sectional view taken along line II in Figure 2. Figure 3 shows a cross-section of one of the two sets of flow paths 51. An inner section 52 of this flow path 51 extends obliquely relative to the end face of the insertion portion 45. A bottom surface 53 of the inner section 52 is hemispherical.

[0025] The outer section 54 extends in the same direction as the plane of the flange portion 43. The outer section 54 opens to the bottom surface 53 of the inner section 52. The angle θ between the inner section 52 and the outer section 54 is an obtuse angle. The outer section 54 has a smaller diameter than the inner section 52. Due to this difference in inner diameter, even if a dimensional error occurs during the processing of the outer section 54, it is easy to make the outer section 54 open to the bottom surface 53.

[0026] Figure 4 is a cross-sectional view taken along line II-II in Figure 2. Figure 4 shows a cross-section of the remaining one of the two sets of flow channels 51. This flow channel 51 has an arrangement that is a left-right inversion of that shown in Figure 3. The opening of the outer section 54 is located on the opposite side to that shown in Figure 3. The angle θ between the inner section 52 and the outer section 54 is an obtuse angle.

[0027] As shown in Figures 3 and 4, the angle between the inner section 52 and the outer section 54 is an obtuse angle. The sharpness of the edge formed at the intersection of the inner section 52 and the outer section 54 is reduced. This effect increases as the inner section 52 and the outer section 54 are arranged closer to a straight line. In this way, the sharpness of the edge formed at the intersection is reduced, thereby reducing stress acting on the flow path even under harsh conditions such as pressurizing hydrogen to ultra-high pressures. By making the bottom surface 53 of the inner section 52 a curved surface, pressure acts evenly across the entire bottom surface 53, reducing stress.

[0028] Figure 5 is an assembly diagram of Figure 1. The head cover 41 is pulled to the base plate 13 via the tie rod 15. The inner section 52 of the flow path 51 opens to the cylinder chamber 31. A check valve 59 is attached to the end of the outer section 54. The compressor 10 in this figure has two sets of flow paths 51, one set being an intake path and the other set being a discharge path.

[0029] A gap is provided between the cylinder 21 and the jacket 23. Coolant is supplied into this gap to cool the area around the cylinder chamber 31. A joint 33 is attached to the jacket 23. The joint 33 serves as the inlet and outlet for the coolant.

[0030] Second Embodiment 6, the head cover 141 of this embodiment has a set of flow paths 51 that is composed of one inner section 52 and two outer sections 54. The head cover 141 is oriented with the fitting portion 45 facing upward. The two outer sections 54 open to the bottom surface 53 of the inner section 52.

[0031] 7 shows a set of flow channels 51 of the head cover 141 of FIG. 6. The bottom surface 53 of the inner section 52 of the flow channel 51 is formed of a curved surface. Two outer sections 54 open into the bottom surface 53. The extension directions of the two outer sections 54 are orthogonal to each other, and each opens into a side surface of the flange portion 43.

[0032] Third Embodiment 8, in the head cover 241 of this embodiment, the outer section 54 of the flow path 51 extends in an oblique direction. The inner section 52 of the flow path 51 extends in a direction perpendicular to the end face of the fitting portion 45. The angle formed between the inner section 52 and the outer section 54 is an obtuse angle, as in the past.

[0033] 9 is a cross-sectional view taken along line III-III in FIG. 8. The inner section 52 of the flow path 51 extends in a direction perpendicular to the end face of the fitting portion 45. The bottom surface 53 of the inner section 52 is hemispherical. The outer section 54 extends obliquely downward from the side surface of the flange portion 43 and opens at the bottom surface 53 of the inner section 52.

[0034] As an improvement to the third embodiment, it is possible to replace the inner section 52 of the flow path 51 with that of the first embodiment. In this case, the inner section 52 extends so as to be inclined with respect to the end face of the fitting portion 45. Therefore, the inner section 52 and the outer section 54 are arranged in a nearly straight line.

[0035] <Fourth embodiment> 10, the head cover 341 of this embodiment may have a curved section 55 between the inner section 52 and the outer section 54. The curved section 55 is also included in the flow path 51. The curved section 55 makes the inner circumferential surface of the entire flow path 51 smooth, and even when the flow path 51 is exposed to high pressure, excessive stress on the inner circumferential surface can be suppressed. The shape, curvature, etc. of the curved section 55 may be freely determined.

[0036] 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]

[0037] 10 Compressor 11 Drive unit 13 Base Plate 15 tie rod 16 Nut 17 Drive rod 21 cylinders 23 Jacket 25 Connection port 27 Piston 29 Seals 31 Cylinder chamber 33 Joints 41, 141, 241, 341 head covers 43 Flange 45 Inset part 47 Seals 51 Flow path 52 Inner section 53 bottom 54 Outer Section 55 curved section 56 Connection port 57 Fixing hole 59 Check valve

Claims

1. A cylinder having a cylinder chamber, A piston that reciprocates inside the cylinder, A head cover that covers one end face of the cylinder, A flow path having an inner section that opens into the cylinder chamber and an outer section that connects to the inner section and opens to the side surface of the head cover, Headcover and, A compressor equipped with the following features.

2. The compressor according to claim 1, wherein the flow path is a plurality of sets.

3. The compressor according to claim 1, wherein the angle between the inner section and the outer section is an obtuse angle.

4. The compressor according to any one of claims 1 to 3, wherein in the flow path, either the inner section or the outer section has a bottom surface formed by a curved surface, and the remaining one of the inner section and the outer section is open to the bottom surface.

5. The compressor according to any one of claims 1 to 3, wherein the flow path has different inner diameters in the inner section and the outer section, the section with the larger inner diameter has a bottom surface formed by a curved surface, and the section with the smaller inner diameter opens to the bottom surface.

6. A compressor according to any one of claims 1 to 3, wherein a curved section is provided between the inner section and the outer section.

7. The compressor according to claim 4, wherein the flow path has a plurality of outer sections connected to a single inner section.

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