Reciprocating compressor

Abstract

This reciprocating compressor comprises: a crankshaft; a crosshead part that is connected to the crankshaft; a cross guide part that accommodates the crosshead part; and a compression part that is placed on the cross guide part. The cross guide part includes: a plurality of column parts each continuing from the lower end to the upper end of the cross guide part on one outer wall of wall parts constituting the cross guide part; and one or more recessed shape parts formed in a recessed shape so as to be thinner than the plurality of column parts between the plurality of column parts in a first direction in which the crankshaft extends.

Description

Reciprocating compressor

[0001] The present invention relates to a vertical reciprocating compressor.

[0002] In recent years, considering the environment, it has been considered to use hydrogen as a fuel for power generation, automobiles, etc., and the demand for hydrogen is increasing. Conventionally, as disclosed in Patent Document 1, a vertical reciprocating compressor has been used. Patent Document 1 discloses a "common housing 18 having a crank drive mechanism 17 and a spacer portion 18a." Paragraph 0028 of Patent Document 1 describes that "the crank drive mechanism 17 includes a crankshaft 17a to which a bearing is attached, and six crossheads 17c that are longitudinally spaced along the outer shape of the crankshaft 17a and are connected to the crankshaft 17a via a push rod 17b. At the same time, the crank drive mechanism 17 includes a crosshead hole 17d through which the crosshead 17c moves, and each crosshead 17c is connected to a piston rod 17e, and each piston rod 17e is connected to pistons 9a, 10a, 13, 14a."

[0003] By the way, in Patent Document 1, weight reduction is not considered for the housing, particularly the cross guide portion that houses the crosshead.

[0004] Japanese Unexamined Patent Application Publication No. 2020-122579

[0005] The present invention has been made in view of the above problems, and an object thereof is to reduce the weight of the reciprocating compressor while ensuring the strength of the cross guide portion of the reciprocating compressor.

[0006] A reciprocating compressor according to an aspect of the present invention is a vertical reciprocating compressor that compresses gas, and includes a crankshaft, a crosshead portion, a cross guide portion, and a compression portion. The crosshead portion is connected to the crankshaft. The cross guide portion houses the crosshead portion. The compression portion is placed on top of the cross guide portion.

[0007] In the reciprocating compressor according to this embodiment, the cross guide portion comprises a plurality of column portions and one or more concave portions on one outer wall of the wall portion constituting the cross guide portion. Each of the plurality of column portions is continuous from the lower end to the upper end of the cross guide portion. The one or more concave portions are formed in a concave shape such that their wall thickness is thinner than that of the plurality of column portions between each other in the first direction in which the crankshaft extends.

[0008] Figure 1 is a front view showing a reciprocating compressor according to one embodiment. Figure 2 is a cross-sectional view showing the internal configuration of the reciprocating compressor. Figure 3 is a perspective view showing a part of the first outer wall of the cross guide section. Figure 4 is a front view showing the arrangement of the column section in the first outer wall. Figure 5 is a perspective view showing the structure of the window section and its surroundings provided in the first outer wall. Figure 6 is a perspective view showing a part of the second outer wall of the cross guide section. Figure 7 is a cross-sectional view showing the lubricating oil passages provided in the first outer wall and the second outer wall, respectively.

[0009] In the following, one embodiment will be described with reference to the drawings. Note that the form described below is merely one example of the present invention, and the present invention is not limited in any way to the following form, except for its essential configuration.

[0010] 1. Overall Configuration of the Reciprocating Compressor 1 The reciprocating compressor 1 according to this embodiment is a vertical reciprocating compressor that compresses gas (for example, hydrogen gas). The overall configuration of the reciprocating compressor 1 will be explained using Figures 1 and 2.

[0011] The reciprocating compressor 1 receives and compresses gas that has been pressurized by a predetermined pressure boosting device. The reciprocating compressor 1 compresses the gas, which has been pressurized to 2 barA or more (more preferably 10 barA or more) by the pressure boosting device, to 10,000 Nm². ３ Inhalation may be performed at a flow rate of 1 / h or more, and the discharge pressure may be 100 barA or more.

[0012] The reciprocating compressor 1 comprises a crankshaft 10 extending in a first direction (X direction), a crosshead portion 20 connected to the crankshaft 10, a cross guide portion 30 housing the crosshead portion 20, and a compression portion 40 mounted on top of the cross guide portion 30 (on the +Z side). The reciprocating compressor 1 according to this embodiment also comprises a base portion 50 housing the crankshaft 10 and a motor 11 connected to the crankshaft 10. The crankshaft 10 rotates around its axis by receiving the rotational driving force of the motor 11. The motor 11 has a rated power of 2000 kW or more and drives the crankshaft 10 so that the rotational speed of the crankshaft 10 is between 300 rpm and 600 rpm.

[0013] The cross guide section 30 includes a wall section that surrounds the cross head section 20. The wall section has a roughly rectangular prism shape and has four outer walls. These four outer walls consist of two outer walls 31 and 32 parallel to the first direction (X direction) and two outer walls parallel to the second direction (Y direction). The second direction (Y direction) is perpendicular to both the first direction (X direction) and the vertical direction (Z direction).

[0014] In the following description, of the four outer walls, the outer wall 31 located on one side (-Y side) in the second direction relative to the space in which the crosshead portion 20 is housed will be referred to as the "first outer wall 31". The outer wall 32 located on the other side (+Y side) in the second direction relative to the space in which the crosshead portion 20 is housed will be referred to as the "second outer wall 32". The first outer wall 31 and the second outer wall 32 are arranged to face each other across the space in which the crosshead portion 20 is housed in the cross guide portion 30.

[0015] The compression section 40 comprises a plurality of cylinders (for example, four cylinders) 41 aligned in a first direction (X direction), a piston 43 provided corresponding to each cylinder 41, and a distance piece 42 interposed between the plurality of cylinders 41 and the cross guide section 30. The distance piece 42 can be omitted. The sliding speed of the piston 43 is 2.5 m / sec or more and 5 m / sec or less.

[0016] Each piston 43 is connected to a drive shaft (piston rod) 21 which is connected to each crosshead section 20. The multiple pistons 43 receive rotational driving force from the motor 11, causing the crankshaft 10 to rotate around its axis, and the adjacent cylinders 41 reciprocate in phase with each other.

[0017] 2. Structure of the first outer wall 31 in the cross guide section 30 The structure of the first outer wall 31, which is one of the outer walls in the cross guide section 30, will be explained using Figures 3 to 5.

[0018] The cross guide section 30 comprises a plurality of intermediate column sections 310 and a plurality of concave sections 311 in the first outer wall 31. The cross guide section 30 also comprises two end column sections 313 at both ends in the first direction (X direction) of the first outer wall 31. In this embodiment, the plurality of intermediate column sections 310 and the two end column sections 313 constitute a "multiple column section". Note that in Figure 3, only the end column section 313 at one end (the +X side end) of the two end column sections 313 provided on the first outer wall 31 is shown, but an end column section 313 is also provided at the other end (the -X side end).

[0019] As shown by the arrow A in Figure 4, the multiple intermediate column sections 310 are each continuous from the upper end 30a to the lower end 30b of the cross guide section 30, and are spaced apart from each other in the first direction (X direction). Similarly, the two end column sections 313 are each continuous from the upper end 30a to the lower end 30b of the cross guide section 30. Each of the multiple intermediate column sections 310 and the two end column sections 313 is a solid column. Note that each of the multiple intermediate column sections 310 and the two end column sections may have steps on their outer surface, or they may have a smooth outer surface without steps. Each of the multiple intermediate column sections 310 and the two end column sections 313 is provided continuous from the upper end 30a to the lower end 30b of the cross guide section 30, regardless of whether or not there are steps on their outer surface.

[0020] The multiple concave portions 311 are each located between adjacent column portions (multiple intermediate column portions 310 and two end column portions 313) in the first direction (X direction). Each of the multiple concave portions 311 is formed to be more concave than the intermediate column portions 310 and end column portions 313, with a wall thickness thinner than the intermediate column portions 310 and end column portions 313. In the first direction (X direction), the intermediate column portions 310 and end column portions 313 and the concave portions 311 which are thinner than the intermediate column portions 310 and end column portions 313 are positioned alternately and are integrally formed.

[0021] In this embodiment, each concave portion 311 is provided corresponding to each cylinder 41 (see Figure 1). More specifically, as shown in Figure 4, when viewing each concave portion 311 from one side in the second direction (-Y side), each concave portion 311 is arranged to include a position that coincides with the axis Ax21 of the drive shaft 21.

[0022] The bottom surface of each concave section 311 is provided with an opening (lubrication port) 312 for supplying lubricating oil to the space in which the crosshead section 20 is housed. The lubrication port 312 will be described later.

[0023] Furthermore, the cross guide section 30 is provided with a window section 314 that penetrates to the internal space where the crosshead section 20 is housed, above (on the +Z side) each concave section 311 in the first outer wall 31. The window section 314 is an opening used for inspection of the crosshead section 20, and is provided corresponding to each cylinder 41 (see Figure 1). When the reciprocating compressor 1 is in use, the window section 314 is covered by a cover member.

[0024] As shown in Figures 4 and 5, horizontal ribs 315 are provided above and below each window section 314, connecting the column sections 310 on both sides in the first direction (X direction). The horizontal ribs 315 are integrally formed with the intermediate column sections 310, and together with the intermediate column sections 310 on both sides in the first direction (X direction), they surround the window section 314 in a frame-like manner. By providing such horizontal ribs 315, it is possible to suppress the reduction in the strength of the first outer wall 31 caused by the opening of the window section 314.

[0025] 3. Structure of the second outer wall 32 in the cross guide section 30 The structure of the second outer wall 32 in the cross guide section 30 will be explained with reference to Figure 6.

[0026] As shown in Figure 6, the cross guide section 30 comprises a plurality of second intermediate column sections 320 and a plurality of second concave sections 321 in the second outer wall 32. The cross guide section 30 also comprises two second end column sections 323 at both ends in the first direction (X direction) of the second outer wall 32. Each of the two end column sections 323 is provided to extend continuously from the upper end 30a to the lower end 30b of the cross guide section 30. Each of the plurality of second intermediate column sections 320 and the two second end column sections is a solid column. Each of the plurality of second intermediate column sections 320 and the two second end column sections may have stepped portions on their outer surfaces, or they may have smooth outer surfaces without steps. Each second intermediate column section 320 and each second end column section 323 only needs to be provided to extend continuously from the upper end 30a to the lower end 30b of the cross guide section 30, regardless of whether or not there are steps on their outer surfaces.

[0027] In this embodiment, the "multiple second column sections" are formed by a plurality of second intermediate column sections 320 and two second end column sections.

[0028] The multiple second concave sections 321 are each positioned between adjacent second intermediate column sections 320 and second end column sections 323 in the first direction (X direction), and between the second intermediate column sections 320 themselves. Each of the multiple second concave sections 321 is formed in a concave shape that is thinner than the second intermediate column sections 320 and second end column sections 323, and is recessed more deeply than the second intermediate column sections 320 and second end column sections 323. Each second concave section 321 is provided corresponding to each cylinder 41 (see Figure 1). Although not shown, when viewing each second concave section 321 from the other side (+Y side) in the second direction, each second concave section 321 is positioned to include a position that coincides with the axis Ax21 of the drive shaft 21 (see Figure 4).

[0029] The multiple second intermediate column sections 320, the multiple second concave sections 321, and the two second end column sections 323 are formed in a symmetrical relationship in the second direction (Y direction) with respect to the multiple intermediate column sections 310, concave sections 311, and end column sections 313 of the first outer wall 31.

[0030] Furthermore, the second outer wall 32, like the first outer wall 31, is also equipped with a fuel filler port 322, a window portion 324, and a transverse rib 325. These are also formed in a symmetrical relationship in the second direction (Y direction) with respect to the fuel filler port 312, window portion 314, and transverse rib 325 of the first outer wall 31. However, the shapes of the second intermediate column portion 320, the second concave portion 321, the second end column portion 323, the fuel filler port 322, the window portion 324, and the transverse rib 325 of the second outer wall 32 do not necessarily have to be formed in a symmetrical relationship in the second direction (Y direction) with respect to each component of the first outer wall 31.

[0031] 4. Structure of Lubricating Oil Passages 316 and 326 As described above, lubricating oil passages 316 and 326 are provided in the first outer wall 31 and the second outer wall 32, respectively. The structure of these lubricating oil passages 316 and 326 will be explained with reference to Figure 7.

[0032] As shown in Figure 7, the first outer wall 31 is provided with a lubricating oil passage 316 formed from the bottom surface 317 of the concave portion 311 toward the inner wall surface 318 of the first outer wall 31. That is, the lubricating oil passage 316 is provided so as to penetrate the first outer wall 31 between the bottom surface 317 and the inner wall surface 318 of the first outer wall 31.

[0033] Furthermore, the lubricating oil passage 316 is formed in the Y direction from the oil inlet 312 side toward the inner wall surface 318 side. However, the lubricating oil passage 316 may be formed with an incline such that the height position gradually decreases as you move from the oil inlet 312 side toward the inner wall surface 318 side. When the lubricating oil passage 316 is formed with an incline in this way, the lubricating oil supplied from the oil inlet 312 does not remain in the lubricating oil passage 316 but is supplied to the space where the crosshead portion 20 (see Figure 2) is housed.

[0034] Furthermore, the lubrication oil passage 316 may be structured in such a way that lubricating oil is supplied from a source other than the oil filler port 312. For example, the first outer wall 31 may be provided with a lubricating oil connecting passage that extends from the space housing the crankshaft toward the lubricating oil passage 316, and this connecting passage may be connected to a point in the middle of the lubricating oil passage 316. In this case, the portion of the concave portion 311 in the lubricating oil passage 316 on the bottom surface 317 side may be sealed with a plug or the like. That is, the space housing the crankshaft may be connected to the inner wall surface 318 by the lubricating oil connecting passage and the lubricating oil passage 316. When this structure is adopted, the lubricating oil supplied from the space housing the crankshaft is supplied to the space housing the crosshead portion 20 without leaking from the bottom surface 317 side of the concave portion 311 of the lubricating oil passage 316.

[0035] Furthermore, the first outer wall 31 is inclined such that, within the height range in which the concave portion 311 is formed, the outer wall surface gradually moves outward in two directions (-Y side) as you move from the top (+Z side) to the bottom (-Z side). The bottom surface 317 of the concave portion 311 is inclined to follow the outer wall surface of the intermediate column portion 310. However, the outer wall surface of the intermediate column portion 310 and the bottom surface 316 of the concave portion 311 do not necessarily have to be inclined.

[0036] The second outer wall 32 is provided with a lubricating oil passage 326 formed from the bottom surface 327 of the second concave portion 321 toward the inner wall surface 328 of the second outer wall 32. That is, the lubricating oil passage 326 is provided so as to penetrate the second outer wall 32 between the bottom surface 327 and the inner wall surface 328 of the second outer wall 32.

[0037] Furthermore, the lubricating oil passage 326 is also formed in the Y direction from the oil inlet 322 side toward the inner wall surface 328 side. However, the lubricating oil passage 326 may also be formed with an inclination such that the height position gradually decreases as you move from the oil inlet 322 side toward the inner wall surface 328 side. When the lubricating oil passage 326 is also formed with an inclination in this way, the lubricating oil supplied from the oil inlet 322 does not remain in the lubricating oil passage 326 but is supplied to the space where the crosshead portion 20 (see Figure 2) is housed.

[0038] Furthermore, the lubrication oil passage 326 may be structured in such a way that lubricating oil is supplied from a source other than the oil filler port 322. For example, the second outer wall 32 may be provided with a lubricating oil connecting passage that extends from the space housing the crankshaft toward the lubricating oil passage 326, and this lubricating oil connecting passage may be connected to a point in the middle of the lubricating oil passage 326. In this case, the portion of the concave portion 321 in the lubricating oil passage 326 on the bottom surface 327 side may be sealed with a plug or the like. That is, the space housing the crankshaft may be connected to the inner wall surface 318 by the lubricating oil connecting passage and the lubricating oil passage 326. When this structure is adopted, the lubricating oil supplied from the space housing the crankshaft is supplied to the space housing the crosshead portion 20 without leaking from the bottom surface 327 side of the concave portion 321 of the lubricating oil passage 326.

[0039] Furthermore, the second outer wall 32 is also inclined such that, within the height range in which the second concave portion 321 is formed, the outer wall surface gradually moves outward in two directions (+Y side) as you move from the top (+Z side) to the bottom (-Z side). The bottom surface 327 of the second concave portion 321 is inclined to follow the outer wall surface of the second intermediate column portion 320. However, the outer wall surface of the second intermediate column portion 320 and the bottom surface 326 of the second concave portion 321 do not necessarily have to be inclined.

[0040] 5. Effects The reciprocating compressor 1 according to this embodiment has a concave portion 311 in at least the first outer wall 31 of the cross guide portion 30. Therefore, the reciprocating compressor 1 can be made lighter compared to the case in which the outer wall of the cross guide portion 30 is formed with the same thickness as the intermediate column portion 310 as the entire surface without the concave portion 311. Thus, high portability can be ensured when installing the reciprocating compressor 1.

[0041] In the reciprocating compressor 1, the cross guide part 30 includes an intermediate column part 310 and an end column part 313 that are continuous from the upper end 30a to the lower end 30b of the cross guide part 30 on both sides of the concave-shaped part 311. Therefore, in the reciprocating compressor 1, compared with the case where the entire first outer wall 31 in the cross guide part 30 is thinned, even when the weight of the compression part 40 placed thereon is added, the strength of the cross guide part 30 against the weight can be ensured.

[0042] Here, usually, the cross guide part 30 is manufactured by a casting method or the like. The reciprocating compressor 1 includes a concave-shaped part 311 provided so as to recess from the outer wall surface of the first outer wall 31 of the cross guide part 30. Therefore, in the reciprocating compressor 1, complicated processes do not need to be performed when manufacturing the cross guide part 30 using a casting method or the like. Thus, the manufacturing cost of the reciprocating compressor 1 can be reduced. However, the concave-shaped part 311 in the cross guide part 30 does not necessarily need to be formed so as to recess from the outer wall surface of the first outer wall 31. For example, a concave-shaped part formed so as to recess from the inner wall surface 318 of the first outer wall 31 can also be adopted.

[0043] In the reciprocating compressor 1 according to the present embodiment, a lubricating oil passage 316 extending from the bottom surface 317 of the concave-shaped part 311 is provided. Therefore, in the reciprocating compressor 1, compared with the case where a lubricating oil passage 316 extending from the outer wall surface of a thick part such as the column part 310 is provided, the manufacturing cost for forming the lubricating oil passage 316 can be reduced. That is, as shown in FIG. 7, the lubricating oil passage 316 is formed at a location having a wall thickness T1 that is thinner than the wall thickness of the column part 310 at the height position where the oil supply port 312 is arranged. Therefore, the passage length can be shortened compared with forming a lubricating oil passage 316 extending from the outer wall surface of the intermediate column part 310 or forming a lubricating oil passage 326 extending from the outer wall surface of the second intermediate column part 320. Thus, in the reciprocating compressor 1, the lubricating oil passage 316 is easy to process, and the manufacturing cost can be reduced.

[0044] In addition, in the present embodiment, the lubricating oil passage 326 in the second outer wall 32 is also formed in a portion having a wall thickness T2 that is thinner than the wall thickness of the second column portion 320 at the height position where the oil supply port 322 is disposed. Therefore, in the reciprocating compressor 1, the number of man-hours for forming the lubricating oil passage 326 can be reduced, and the manufacturing cost can be further reduced.

[0045] Further, the reciprocating compressor 1 according to the present embodiment has a plurality of cylinders 41. In such a reciprocating compressor 1 having a plurality of cylinders 41, the phases of the pistons 43 are different between adjacent cylinders 41. Even in such a case, in the reciprocating compressor 1, the intermediate column portion 310 and the second intermediate column portion 320 are provided at corresponding positions between adjacent cylinders 41 in the first direction (X direction), so that the strength of each cylinder 41 can be ensured.

[0046] Further, the reciprocating compressor 1 is provided with a plurality of concave portions 311 on the first outer wall 31 and a plurality of second concave portions 321 on the second outer wall 32. Therefore, in the reciprocating compressor 1, weight reduction can be achieved more effectively compared to the case where the concave portions 311 and 321 are provided only on one outer wall (the first outer wall 31 or the second outer wall 32).

[0047] Further, in the reciprocating compressor 1 according to the present embodiment, each concave portion 311 and each second concave portion 321 are formed so as to include a position overlapping the axis Ax21 of the drive shaft 21 in a front view. Therefore, in the reciprocating compressor 1, while achieving weight reduction, the strength of the cross guide portion 30 can be ensured. That is, in the reciprocating compressor 1, weight reduction can be achieved by providing the concave portion 311 and the second concave portion 321 for each cylinder 41. Also, in the reciprocating compressor 1, the intermediate column portion 310 and the second intermediate column portion 320 provided between adjacent cylinders 41 ensure a high balance in the first direction (X direction), and the strength of the cross guide portion 30 can be ensured.

[0048] [Modification] In the reciprocating compressor 1 according to the above embodiment, a concave portion 311 and a second concave portion 321 are provided on the outer wall surfaces of the first outer wall 31 and the second outer wall 32, respectively, but the present invention is not limited thereto. That is, as described above, the concave portion 311 and the second concave portion 321 may be provided so as to be recessed in the thickness direction from the inner wall surface 318 of the first outer wall 31 and the inner wall surface 328 of the second outer wall 32 (see Figure 7).

[0049] Furthermore, in the reciprocating compressor 1 according to the above embodiment, a concave portion 311 and a second concave portion 321 are provided corresponding to each cylinder 41, but the present invention is not limited thereto. The concave portion 311 and the second concave portion 321 do not necessarily have to correspond to each cylinder 41, and may be provided considering the distribution of the load added by the weight of the compression section 40. In other words, the number of concave portions 311 and second concave portions 321 may be increased or decreased relative to the number of cylinders 41. In addition, multiple concave portions 311 and second concave portions 321 divided in the vertical direction may be provided.

[0050] Furthermore, in the reciprocating compressor 1 according to the above embodiment, as shown in Figure 4, the concave portion 311 and the second concave portion 321 are arranged to include a position that coincides with the axis Ax21 of the drive shaft 21 when viewed from one side (-Y side) in the second direction (Y direction). However, the present invention is not limited thereto. That is, the concave portion 311 and the second concave portion 321 do not necessarily have to be arranged to include a position that coincides with the axis Ax21 of the drive shaft 21.

[0051] Furthermore, while the reciprocating compressor 1 according to the above embodiment is provided with a rectangular concave portion 311 and a second concave portion 321 in a front view, the present invention is not limited thereto. For example, the concave portion 311 and the second concave portion 321 may be polygonal, circular, or oval in shape in a front view.

[0052] Furthermore, in the reciprocating compressor 1 according to the above embodiment, one lubricating oil passage 316 is provided for each concave portion 311, and one lubricating oil passage 326 is provided for each second concave portion, but the present invention is not limited thereto. For example, multiple lubricating oil passages 316 may be provided in one concave portion 311, or multiple lubricating oil passages 326 may be provided in one second concave portion 321. Also, lubricating oil passages 316 may be provided in some of the concave portions 311 among the multiple concave portions 311, or lubricating oil passages 326 may be provided in some of the second concave portions 321 among the multiple second concave portions 321.

[0053] Furthermore, in the reciprocating compressor 1 according to the above embodiment, a concave portion 311 is provided on the first outer wall 31 of the outer wall of the cross guide portion 30, and a second concave portion 321 is provided on the second outer wall 32, but the present invention is not limited thereto. For example, a concave portion may be provided on the outer wall located on one side (+X side) in the first direction (X direction) of the outer wall of the cross guide portion 30, and a second concave portion may be provided on the outer wall located on the other side (-X side).

[0054] Furthermore, in the reciprocating compressor 1 according to the above embodiment, the intermediate column portion 310 and the end column portion 313 and the concave portion 311 are integrally formed, and the second intermediate column portion 320 and the second end column portion 323 and the second concave portion 321 are integrally formed, but the present invention is not limited thereto. That is, the first outer wall 31 may have a configuration in which the intermediate column portion 310, the end column portion 313 and the concave portion 311 are not integrally formed. Also, the second outer wall 32 may have a configuration in which the second intermediate column portion 320, the second end column portion 323 and the second concave portion 321 are not integrally formed. As a specific example, ribs extending in the vertical direction (Z direction) may be welded to the wall portions with thicknesses T1 and T2 (see Figure 7) at the bottom of the concave portion and the second concave portion, thereby providing intermediate column portions 310 and end column portions 313, second intermediate column portions 320 and second end column portions 323 at the joined portions.

[0055] Furthermore, while the reciprocating compressor 1 according to the above embodiment uses hydrogen gas as the target of compression, the present invention is not limited to this. For example, other gases such as natural gas may be used as the target of compression.

[0056] It should be noted that the embodiments disclosed herein are illustrative and not restrictive in all respects. The present invention is not limited to the embodiments described above, and various modifications and improvements are possible without departing from the spirit of the invention.

[0057] [Summary] The reciprocating compressor according to the above embodiment is a vertical reciprocating compressor for compressing gas, and comprises a crankshaft, a crosshead section, a cross guide section, and a compression section. The crosshead section is connected to the crankshaft. The cross guide section houses the crosshead section. The compression section is mounted on the cross guide section.

[0058] In the reciprocating compressor according to the above embodiment, the cross guide portion comprises a plurality of column portions and one or more concave portions on one outer wall of the wall portion constituting the cross guide portion. Each of the plurality of column portions is continuous from the lower end to the upper end of the cross guide portion. The one or more concave portions are formed in a concave shape such that their wall thickness is thinner than that of the plurality of column portions in the first direction in which the crankshaft extends.

[0059] In the reciprocating compressor according to the above embodiment, at least one of the outer walls of the cross guide section has a concave shape, so it can be made lighter compared to the case where the cross guide section is formed with the same thickness as the column section without having the concave shape. Therefore, high portability can be ensured when installing the reciprocating compressor.

[0060] Furthermore, in the reciprocating compressor according to the above embodiment, the cross guide section is provided with columnar sections that extend continuously from the lower end to the upper end on both sides of the concave section. Therefore, in the above reciprocating compressor, compared to the case where the entire outer wall of one of the cross guide sections is thinned, the strength of the cross guide section can be ensured even when the weight of the compression section placed on top is added.

[0061] In the reciprocating compressor according to the above embodiment, the concave portion may be provided in the outer wall of one of the cross guide portions such that it is recessed from at least a part of the outer wall surface.

[0062] The reciprocating compressor according to the above embodiment includes a concave portion provided so as to be recessed from the outer wall surface of one of the outer walls of the cross guide portion. Therefore, when manufacturing the cross guide portion using a casting method or the like, complicated processes are not required. Thus, the reciprocating compressor according to the above embodiment achieves a reduction in manufacturing costs.

[0063] In the reciprocating compressor according to the above embodiment, the cross guide portion may be provided with a lubricating oil passage. The lubricating oil passage is a passage for receiving lubricating oil and may penetrate at least a portion of the outer wall surface to the inner wall surface of the cross guide portion that receives the crosshead portion.

[0064] The reciprocating compressor according to the above embodiment is provided with a lubricating oil passage leading to the inner wall surface of the cross guide section, thereby reducing resistance between the crosshead section and the inner wall surface of the cross guide section. This suppresses seizure between the crosshead section and the inner wall surface of the cross guide section.

[0065] In the reciprocating compressor according to the above embodiment, the cross guide portion may be provided on the bottom surface of the concave portion and may include an oil inlet for receiving the lubricating oil from the outside.

[0066] In the reciprocating compressor according to the above embodiment, since the oil inlet is provided on the bottom surface of the concave section, the length of the lubricating oil passage can be shortened compared to when the oil inlet is provided on the outer wall surface of a thick section such as a column. Therefore, in the reciprocating compressor according to the above embodiment, the lubricating oil passage can be easily processed, and manufacturing costs can be reduced.

[0067] Furthermore, in the reciprocating compressor according to the above embodiment, since the oil inlet, which serves as one end of the lubricating oil passage, is provided on the bottom surface of the concave portion, compared to cases where the oil inlet is located elsewhere, there is no need to machine holes other than those for the lubricating oil passage, thus reducing manufacturing costs.

[0068] In the reciprocating compressor according to the above embodiment, the compression section may have a plurality of cylinders aligned in the first direction. In this case, the plurality of column sections may include two end column sections arranged at both ends in the first direction, and one or more intermediate column sections arranged between the two end column sections in the first direction. Furthermore, if the direction perpendicular to both the first direction and the vertical direction is defined as the second direction, and the one outer wall is defined as the first outer wall, the wall section constituting the cross guide section may include a second outer wall facing the first outer wall in the second direction, with the space in which the crosshead section is housed in between. Moreover, in the first outer wall, the intermediate column sections are provided at positions corresponding to the spaces between adjacent cylinders in the first direction, and the plurality of concave sections may be provided in a plurality corresponding to the plurality of cylinders.

[0069] In the reciprocating compressor described above, the second outer wall may comprise a plurality of second column portions and a plurality of second concave portions. Each of the plurality of second column portions may be continuous from the lower end to the upper end of the cross guide portion. The plurality of second concave portions may be formed in a concave shape between the plurality of second column portions in the first direction in which the crankshaft extends, such that their wall thickness is thinner than that of the plurality of second column portions, and may be provided corresponding to each cylinder. In this case, the plurality of second column portions may include two second end column portions arranged at both ends in the first direction, and one or more second intermediate column portions provided on the second outer wall of the cross guide portion between the two second end column portions, and provided at positions corresponding to between adjacent cylinders in the first direction.

[0070] In a reciprocating compressor having multiple cylinders, if the piston phases of adjacent cylinders differ, the load on the cross guide section tends to increase. Even in such cases, the reciprocating compressor according to the above embodiment has intermediate column sections and second intermediate column sections provided at positions corresponding to the space between adjacent cylinders in the first direction, so that strength can be ensured in each cylinder.

[0071] Furthermore, in the reciprocating compressor according to the above embodiment, since multiple concave sections and multiple second concave sections are provided on each of the first and second outer walls facing each other in the second direction, it is possible to achieve greater weight reduction compared to the case where concave sections are provided on only one of the outer walls.

[0072] In the reciprocating compressor according to the above embodiment, when viewing the plurality of concave portions in the second direction, each of the plurality of concave portions may be arranged to include a position that coincides with the axis of the drive shaft in the crosshead portion.

[0073] In the reciprocating compressor according to the above embodiment, each concave portion is formed so as to include a position that coincides with the axis of the drive shaft, and the intermediate column portions provided between adjacent cylinders ensure high balance in the first direction and thus ensure the strength of the cross guide portion.

[0074] In the reciprocating compressor according to the above embodiment, a motor connected to the crankshaft may be further provided. In this case, the rated power of the motor may be 2000 kW or more. The motor may also be configured to drive the crankshaft so that the rotational speed of the crankshaft is 300 rpm or more and 600 rpm or less. Furthermore, the sliding speed of the crosshead may be 2.5 m / sec or more and 5 m / sec or less. In addition, a gas of 2 bar A or more is supplied at 10000 Nm ３ The suction may be at a flow rate of 1 / h or more, and the discharge pressure may be 100 barA or more.

[0075] In the reciprocating compressor according to the above embodiment, the gas may be hydrogen gas.

[0076] As described above, the reciprocating compressor according to the above embodiment can be made lighter while ensuring the strength of the cross guide section of the reciprocating compressor.

[0077] This application is based on Japanese Patent Application No. 2025-024068, filed with the Japan Patent Office on February 18, 2025, and the contents of the basic application are incorporated into this application.

Claims

1. A vertical reciprocating compressor for compressing gas, comprising: a crankshaft; a crosshead portion connected to the crankshaft; a cross guide portion housing the crosshead portion; and a compression portion mounted on the cross guide portion, wherein the cross guide portion comprises, on one outer wall of the wall portion constituting the cross guide portion, a plurality of column portions, each continuous from the lower end to the upper end of the cross guide portion, and one or more concave portions formed in a concave shape between the plurality of column portions in a first direction in which the crankshaft extends, such that the thickness is thinner than that of the plurality of column portions.

2. The reciprocating compressor according to claim 1, wherein the concave portion is provided in one of the outer walls of the cross guide portion such that it is recessed from at least a part of the outer wall surface.

3. The reciprocating compressor according to claim 2, wherein the cross guide portion is a lubricating oil passage for receiving lubricating oil, and the lubricating oil passage penetrates at least a portion of the outer wall surface to the inner wall surface of the cross guide portion that receives the crosshead portion.

4. The reciprocating compressor according to claim 3, wherein the cross guide portion is provided on the bottom surface of the concave portion and includes an oil inlet for receiving the lubricating oil from the outside.

5. The compression section has a plurality of cylinders aligned in the first direction, and the plurality of column sections include two end column sections located at both ends in the first direction and one or more intermediate column sections located between the two end column sections in the first direction, and when the direction perpendicular to both the first direction and the vertical direction is defined as the second direction and the one outer wall is defined as the first outer wall, the wall section constituting the cross guide section includes a second outer wall facing the first outer wall in the second direction, with the space in which the crosshead section is housed in between, and in the first outer wall, the intermediate column sections are provided at positions corresponding to adjacent cylinders in the first direction, and the plurality of concave sections are provided in a plurality corresponding to the plurality of cylinders, and the second outer wall has a plurality of second column sections, each continuous from the lower end to the upper end of the cross guide section, A reciprocating compressor according to any one of claims 1 to 4, comprising: a plurality of second concave portions formed in a concave shape between the plurality of second column portions in a first direction in which the crankshaft extends, such that the thickness of the second column portion is thinner than that of the plurality of second column portions, and provided corresponding to each of the cylinders, wherein the plurality of second column portions include two second end column portions arranged at both ends in the first direction, and one or more second intermediate column portions provided on the second outer wall of the cross guide portion between the two second end column portions, and provided at positions corresponding to between adjacent cylinders in the first direction.

6. The reciprocating compressor according to claim 5, wherein, when viewing the plurality of concave portions in the second direction, each of the plurality of concave portions is arranged to include a position that coincides with the axis of the drive shaft in the crosshead portion.

7. The system further comprises a motor connected to the crankshaft, the rated power of the motor being 2000 kW or more, the motor being configured to drive the crankshaft so that the rotational speed of the crankshaft is 300 rpm or more and 600 rpm or less, the sliding speed of the crosshead being 2.5 m / sec or more and 5 m / sec or less, and a gas of 2 bar A or more being supplied at 10000 Nm ３ A reciprocating compressor according to any one of claims 1 to 4, wherein it draws in at a flow rate of 1 / h or more and has a discharge pressure of 100 barA or more.

8. The reciprocating compressor according to any one of claims 1 to 4, wherein the gas is hydrogen gas.

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