Screw compressor

Abstract

The invention provides a screw compressor capable of improving cooling efficiency. A casing cooling flow path (12) for a screw compressor is provided with: a discharge-side cooling flow path (13) formed on the upper side of a casing (4) and formed on the entire outer periphery of a discharge flow path (11); a male rotor-side cooling flow path (14) which is formed on one side of the housing (4) in the horizontal direction and into which a cooling liquid flows from the discharge-side cooling flow path (13); a female rotor-side cooling flow path (15) which is formed on the opposite side of the housing (4) in the horizontal direction and into which the cooling liquid flows from the discharge-side cooling flow path (13); a transverse rib (22) which is provided in the male rotor-side cooling flow path (14) so as to extend in the rotor axial direction, and which suppresses the inflow of the cooling liquid from the discharge-side cooling flow path (13) to the male rotor-side cooling flow path (14); and a transverse rib (23) that is provided in the female rotor-side cooling flow path (15) so as to extend in the axial direction of the rotor, and that suppresses the inflow of the cooling liquid from the discharge-side cooling flow path (13) to the female rotor-side cooling flow path (15).

Description

Technical Field

[0001] The invention relates to a screw compressor for compressing gas. Background Art

[0002] The screw compressor of Patent Document 1 includes: a male rotor arranged on one side in the horizontal direction; a female rotor arranged on the opposite side in the horizontal direction and rotating in a manner meshing with the male rotor; a suction side bearing and a discharge side bearing that rotatably support the male rotor and the female rotor; a shell that accommodates the male rotor, the female rotor, the suction side bearing and the discharge side bearing, and forms a plurality of compression chambers in the tooth grooves of the male rotor and the female rotor; an intake flow path that connects an intake port (opening) formed on the lower surface of the shell with the compression chamber of the intake process; and a discharge flow path that connects a discharge port (opening) formed on the upper surface of the shell with the compression chamber of the discharge process.

[0003] The screw compressor of Patent Document 1 also includes a shell cooling flow path (cooling jacket) formed in the shell and through which cooling water flows. The shell cooling flow path includes: a discharge side cooling flow path formed on the upper side of the shell and formed on the entire periphery of the discharge flow path; a male rotor side cooling flow path formed on one side of the shell in the horizontal direction (in other words, the male rotor side) and connected to the discharge side cooling flow path; a female rotor side cooling flow path formed on the opposite side of the shell in the horizontal direction (in other words, the female rotor side) and connected to the discharge side cooling flow path; an intake side cooling flow path connected between the male rotor side cooling flow path and the female rotor side cooling flow path formed on the lower side of the shell and closer to the intake flow path than the discharge side bearing; an inlet provided at the male rotor side cooling flow path; and an outlet provided at the female rotor side cooling flow path. The vertical positions of the inlet and the outlet are the same as the axis of the male rotor and the female rotor.

[0004] Cooling water is supplied from the outside to the male rotor side cooling flow path through the inlet. A portion of the cooling water supplied to the male rotor side cooling flow path flows in the order of the upper portion of the male rotor side cooling flow path, the discharge side cooling flow path, and the upper portion of the female rotor side cooling flow path, and is discharged to the outside through the outlet. A portion of the cooling water supplied to the male rotor side cooling flow path flows in the order of the lower portion of the male rotor side cooling flow path, the bearing side cooling flow path, and the lower portion of the female rotor side cooling flow path, and is discharged to the outside through the outlet.

[0005] Prior art literature

[0006] Patent Literature

[0007] Patent Document 1: Japanese Patent Application Laid-Open No. 05-231362 Summary of the invention

[0008] Technical problem to be solved by the invention

[0009] In a screw compressor, the temperature of the parts around the discharge flow path is relatively high due to the generation of compression heat. The shell cooling flow path of Patent Document 1 has a discharge side cooling flow path, a male rotor side cooling flow path, a female rotor side cooling flow path and an intake side cooling flow path. The discharge side cooling flow path is formed on the entire periphery of the discharge flow path, so the discharge flow path can be efficiently cooled. However, there is room for improvement in terms of increasing the flow rate and flow velocity of the coolant in the discharge side cooling flow path to improve the cooling efficiency.

[0010] The present invention has been made in view of the above circumstances, and one of its objects is to improve cooling efficiency.

[0011] Technical solutions to solve problems

[0012] In order to solve the above-mentioned problems, the structure described in the scope of the invention is applied. The present invention includes multiple solutions for solving the above-mentioned problems. As an example, a screw compressor includes: a male rotor arranged on one side in the horizontal direction; a female rotor arranged on the opposite side in the horizontal direction and capable of rotating in a manner meshing with the male rotor; a suction side bearing and a discharge side bearing that rotatably support the male rotor and the female rotor; a shell that accommodates the male rotor, the female rotor, the suction side bearing and the discharge side bearing, and forms a plurality of compression chambers in the tooth grooves of the male rotor and the female rotor; a suction flow path that connects the suction port formed on one side of the shell in the vertical direction with the compression chamber of the suction process; a discharge flow path that connects the discharge port formed on the opposite side of the shell in the vertical direction with the compression chamber of the discharge process; and a shell cooling flow path formed in the shell for the flow of coolant. In a rod-type compressor, the casing cooling flow path comprises: a discharge side cooling flow path formed on the opposite side in the vertical direction of the casing and formed on the entire outer periphery of the discharge flow path; a male rotor side cooling flow path formed on the one side in the horizontal direction of the casing and capable of flowing coolant from the discharge side cooling flow path; a female rotor side cooling flow path formed on the opposite side in the horizontal direction of the casing and capable of flowing coolant from the discharge side cooling flow path; a first transverse rib, which is arranged on the male rotor side cooling flow path in a manner extending in the axial direction of the rotor, for inhibiting the flow of coolant from the discharge side cooling flow path to the male rotor side cooling flow path; and a second transverse rib, which is arranged on the female rotor side cooling flow path in a manner extending in the axial direction of the rotor, for inhibiting the flow of coolant from the discharge side cooling flow path to the female rotor side cooling flow path.

[0013] Effects of the Invention

[0014] According to the present invention, it is possible to improve the cooling efficiency.

[0015] In addition, the problems, structures and effects other than those described above will become more apparent from the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a vertical cross-sectional view showing the structure of the screw compressor according to the first embodiment of the present invention.

[0017] Figure 2 It is a horizontal cross-sectional view showing the structure of the screw compressor according to the first embodiment of the present invention.

[0018] Figure 3 It is a transparent perspective view of a main casing showing the overall structure of a casing cooling flow path according to the first embodiment of the present invention.

[0019] Figure 4 It is a horizontal cross-sectional view of the main casing showing the structure of the discharge-side cooling flow path in the first embodiment of the present invention.

[0020] Figure 5 It is a vertical cross-sectional view of the main casing showing the structure of the male rotor side cooling flow path and the supply flow path in the first embodiment of the present invention.

[0021] Figure 6 This is a vertical cross-sectional view of the main casing showing the structure of the female rotor side cooling flow path in the first embodiment of the present invention.

[0022] Figure 7 This is a perspective view of a main casing showing the overall structure of a casing cooling flow path in a modified example of the present invention.

[0023] Figure 8 It is a vertical cross-sectional view showing the structure of a screw compressor according to a second embodiment of the present invention.

[0024] Fig. 9 It is a transparent perspective view of a main casing showing the overall structure of a casing cooling flow path according to a second embodiment of the present invention.

[0025] Fig.10 It is a horizontal cross-sectional view of the main casing showing the structure of the discharge-side cooling flow path in the second embodiment of the present invention.

[0026] Fig.11 It is a vertical cross-sectional view of the main casing showing the structure of the male rotor side cooling flow path in the second embodiment of the present invention.

[0027] Fig.12 It is a vertical cross-sectional view of the main casing showing the structure of the cooling flow path on the female rotor side in the second embodiment of the present invention. DETAILED DESCRIPTION

[0028] A first embodiment of the present invention will be described with reference to the drawings.

[0029] Figure 1It is a vertical cross-sectional view showing the structure of the screw compressor according to the present embodiment. Figure 2 is a horizontal cross-sectional view showing the structure of the screw compressor of this embodiment. Figure 1 In the figure, although the discharge side cooling flow path and the bearing side cooling flow path described later are shown, Figure 2 In the figure, the male rotor side cooling flow path and the female rotor side cooling flow path described later are omitted.

[0030] The screw compressor of this embodiment includes: a screw compressor disposed on one side in the horizontal direction ( Figure 2 The positive rotor 1A is arranged on the upper side of the horizontal direction; Figure 2 The female rotor 1B is arranged on the lower side of the male rotor 1A and rotates in mesh with the male rotor 1A; the suction side bearing 2A and the discharge side bearing 3A that rotatably support the male rotor 1A; the suction side bearing 2B and the discharge side bearing 3B that rotatably support the female rotor 1B; and the housing 4 that accommodates the male rotor 1A, the female rotor 1B, the suction side bearings 2A, 2B and the discharge side bearings 3A, 3B. In addition, the male rotor 1A and the female rotor 1B are arranged in their axial direction ( Figure 1 and Figure 2 The left and right directions) are configured in a horizontal direction.

[0031] One side of the male rotor 1A ( Figure 1 and Figure 2 The shaft portion of the male rotor 1A (left side) protrudes from the housing 4 and is connected to a rotary machine (specifically, a motor, etc.) via a gear mechanism or a belt mechanism, for example. As a result, the rotational force of the rotary machine is transmitted to the male rotor 1A, and the male rotor 1A rotates.

[0032] On the other side of the male rotor 1A ( Figure 1 and Figure 2 A timing gear (not shown) is provided on the shaft of the male rotor 1A (on the right side), and a timing gear (not shown) is also provided on the shaft of the female rotor 1B, and these timing gears mesh with each other. Thus, the rotational force of the male rotor 1A is transmitted to the female rotor 1B, and the female rotor 1B rotates in a state where the teeth of the male rotor 1A and the teeth of the female rotor 1B do not contact each other.

[0033] The housing 4 is composed of, for example, a main housing 5 and a suction side housing 6 connected to the main housing 5. The main housing 5 has: a male rotor side bore 7A that accommodates the teeth of the male rotor 1A and forms a plurality of compression chambers in its tooth grooves; and a female rotor side bore 7B that accommodates the teeth of the female rotor 1B and forms a plurality of compression chambers in its tooth grooves. The male rotor side bore 7A and the female rotor side bore 7B are each cylindrical and are arranged so as to partially overlap each other.

[0034] Each compression chamber rotates from one side of the rotor axial direction ( Figure 1 and Figure 2 to the left side) to the opposite side ( Figure 1 and Figure 2 As a result, each working chamber sequentially performs an intake process of inhaling air or other gas, a compression process of compressed gas, and a discharge process of discharged compressed gas.

[0035] The main housing 5 has a suction port (opening) 8 formed on one side in the vertical direction, i.e., the lower surface, and a discharge port (opening) 9 formed on the opposite side in the vertical direction, i.e., the upper surface. A suction flow path 10 connecting the suction port 8 with the compression chamber of the suction process is formed in the main housing 5 and the suction side housing 6. A discharge flow path 11 connecting the discharge port 9 with the compression chamber of the discharge process is formed in the main housing 5.

[0036] In the present embodiment, in order to suppress thermal expansion of the main housing 5 and the like due to compression heat, a housing cooling flow path 12 is formed in the main housing 5 , and a coolant such as water or oil flows in the housing cooling flow path 12 .

[0037] use Figure 3 to Figure 6 and the above Figure 1 The structure of the case cooling flow path 12 of the present embodiment will be described. Figure 3 1 is a perspective view of the main housing 5 showing the overall structure of the housing cooling flow path 12 of this embodiment. Figure 3 In FIG. 1 , the outer shape of the main housing 5 is indicated by two-dot chain lines, and the male rotor side cavity 7A, the female rotor side cavity 7B and the discharge flow path 11 are partially indicated by two-dot chain lines. Figure 4 It is a horizontal cross-sectional view (cross-sectional view viewed from the upper side) of the main casing showing the structure of the discharge-side cooling flow path according to the present embodiment. Figure 5 This is a vertical cross-sectional view of the main casing showing the structure of the male rotor side cooling flow path and the supply flow path in this embodiment (based on Figure 4 (sectional view viewed in direction VV). Figure 6 This is a vertical cross-sectional view of the main housing showing the structure of the cooling flow path on the female rotor side in this embodiment (based on Figure 4 VI-VI cross-sectional view).

[0038] The housing cooling flow path 12 includes: a discharge side cooling flow path 13, which is formed on the upper side of the main housing 5 and is formed on the entire outer periphery of the discharge flow path 11 (the entire outer periphery, in other words, the entire periphery of the cross section perpendicular to the flow direction of the coolant); a male rotor side cooling flow path 14, which is formed on one side of the main housing 5 in the horizontal direction (in other words, the male rotor side) and is connected to the discharge side cooling flow path 13; a female rotor side cooling flow path 15, which is formed on the opposite side of the main housing 5 in the horizontal direction (in other words, the female rotor side) and is connected to the discharge side cooling flow path 13; and a bearing side cooling flow path 16 (refer to Figure 1), which is formed on the lower side of the main casing 5 and is formed closer to the discharge side bearings 3A, 3B than the suction flow path 10, and is connected between the male rotor side cooling flow path 14 and the female rotor side cooling flow path 15.

[0039] In addition, the casing cooling flow path 12 includes: a longitudinal rib 17, which is provided on one side of the main casing 5 in the horizontal direction (in other words, on the male rotor side) and extends in the vertical direction; a supply flow path 18, which is separated from the male rotor side cooling flow path 14 by the longitudinal rib 17 and connected to the discharge side cooling flow path 13; an inlet 19 provided on one side of the main casing 5 in the horizontal direction and located on the lower side (in detail, on the lower side of the supply flow path 18); and an outlet 20 provided on the opposite side of the main casing 5 in the horizontal direction and located on the upper side. Pipes 21A and 21B are connected to the inlet 19 and the outlet 20.

[0040] Cooling water is supplied from the outside to the discharge side cooling channel 13 via the pipe 21A, the inlet 19, and the supply channel 18, and flows in the discharge side cooling channel 13. A portion of the cooling water flowing in the discharge side cooling channel 13 does not flow out to the male rotor side cooling channel 14 and the female rotor side cooling channel 15, but is discharged to the outside via the outlet 20 and the pipe 21B. A portion of the cooling water flowing in the discharge side cooling channel 13 flows into the male rotor side cooling channel 14, flows through the male rotor side cooling channel 14, the bearing side cooling channel 16, and the female rotor side cooling channel 15 in the following order, and is discharged to the outside via the outlet 20 and the pipe 21B. A portion of the cooling water flowing in the discharge side cooling channel 13 flows into the upper part of the female rotor side cooling channel 15, flows through the upper part of the female rotor side cooling channel 15, and is discharged to the outside via the outlet 20 and the pipe 21B.

[0041] As the most significant feature of this embodiment, the casing cooling flow path 12 has: a transverse rib 22, which is arranged in the rotor axial direction ( Figure 5 The cooling passage 14 is provided on the male rotor side in a manner extending in the left-right direction; and the transverse rib 23 is provided in a manner extending in the rotor axial direction ( Figure 6 The transverse ribs 22 and 23 are arranged in the cooling passage 15 on the female rotor side so as to extend in the left-right direction. Figure 5 and Figure 6 The position of the upper and lower directions) is the same as the axis center of the male rotor 1A and the axis center of the female rotor 1B.

[0042] The transverse rib 22 occupies, for example, 50 to 90% of the width of the male rotor side cooling channel 14 in the axial direction of the rotor, and inhibits the flow of coolant from the discharge side cooling channel 13 to the male rotor side cooling channel 14. The transverse rib 23 occupies, for example, 50 to 90% of the width of the female rotor side cooling channel 15 in the axial direction of the rotor, and inhibits the flow of coolant from the discharge side cooling channel 13 to the female rotor side cooling channel 15. As a result, the flow rate of cooling water in the male rotor side cooling channel 14, the female rotor side cooling channel 15, and the bearing side cooling channel 16 can be reduced, and the flow rate of cooling water in the discharge side cooling channel 13 can be increased according to the reduced amount. As a result, the cooling force on the surrounding part of the discharge channel 11 can be increased, and the cooling efficiency can be improved.

[0043] In addition, in the present embodiment, the inlet 19 of the case cooling flow path 12 is provided at the lower side of the case 4, and the outlet 20 is provided at the upper side of the case 4. Thus, compared with the case where the inlet of the case cooling flow path 12 is provided at the upper side of the case 4 and the outlet is provided at the lower side of the case 4, it is possible to suppress the accumulation of air in the case cooling flow path 12.

[0044] In addition, in the first embodiment, the inlet 19 of the housing cooling flow path 12 is provided on one side and the lower side of the housing 4 in the horizontal direction, and the outlet 20 is provided on the opposite side and the upper side of the housing 4 in the horizontal direction. However, the present invention is not limited thereto. Figure 7 As in the illustrated modification, the outlet 20 of the case cooling flow path 12 may be disposed on the upper side of the case 4 and between the axis centers of the male rotor 1A and the female rotor 1B in the horizontal direction.

[0045] Alternatively, although not shown, the inlet 19 of the casing cooling flow path 12 may be provided on the opposite side and the lower side of the casing 4 in the horizontal direction, and the outlet 20 may be provided on the one side and the upper side of the casing 4 in the horizontal direction. In this case, the longitudinal rib 17 is provided on the opposite side of the casing 4 in the horizontal direction, and the supply flow path 18 may be separated from the female rotor side cooling flow path 15 by the longitudinal rib 17.

[0046] In addition, in the first embodiment, the vertical position of the transverse ribs 22 and 23 is the same as the axis of the male rotor 1A and the axis of the female rotor 1B, but the present invention is not limited thereto. The vertical position of the transverse ribs 22 and 23 may be closer to the discharge port 9 (i.e., the upper side) than the axis of the male rotor 1A and the axis of the female rotor 1B.

[0047] A second embodiment of the present invention will be described with reference to the drawings. In this embodiment, the same reference numerals are given to the same parts as those in the first embodiment, and the description thereof will be appropriately omitted.

[0048] Figure 8 It is a vertical cross-sectional view showing the structure of the screw compressor according to the present embodiment.

[0049] In the present embodiment, the main housing 5 has a suction port (opening) 8A formed on one side in the vertical direction, i.e., the upper surface, and a discharge port (opening) 9A formed on the opposite side in the vertical direction, i.e., the lower surface. A suction flow path 10A that connects the suction port 8A with the compression chamber of the suction process is formed in the suction side housing 6. A discharge flow path 11A that connects the discharge port 9A with the compression chamber of the discharge process is formed in the main housing 5.

[0050] In the present embodiment, in order to suppress thermal expansion of the main housing 5 and the like due to compression heat, a housing cooling flow path 12A is formed in the main housing 5 , and a coolant such as water or oil flows in the housing cooling flow path 12A.

[0051] use Figures 9 to 12 and the above Figure 8 The structure of the case cooling flow path 12A according to the present embodiment will be described. Fig. 9 1 is a perspective view of the main housing 5 showing the overall structure of the housing cooling flow path 12A of the present embodiment. Fig. 9 In FIG. 1 , the outer shape of the main housing 5 is indicated by two-dot chain lines, and the male rotor side cavity 7A, the female rotor side cavity 7B, and the discharge flow path 11A are partially indicated by two-dot chain lines. Fig.10 It is a horizontal cross-sectional view (cross-sectional view viewed from the bottom) of the main casing showing the structure of the discharge-side cooling flow path according to the present embodiment. Fig.11 This is a vertical cross-sectional view of the main housing showing the structure of the male rotor side cooling flow path in this embodiment (based on Fig.10 XI-XI cross-sectional view). Fig.12 This is a vertical cross-sectional view of the main housing showing the structure of the cooling flow path on the female rotor side in this embodiment (based on Fig.10 (Sectional view in the direction XII-XII).

[0052] The casing cooling flow path 12A includes: a discharge-side cooling flow path 13A formed on the lower side of the main casing 5 and formed on the entire outer periphery of the discharge flow path 11A; a male rotor-side cooling flow path 14A formed on one side of the main casing 5 in the horizontal direction (in other words, the male rotor side) and connected to the discharge-side cooling flow path 13A; a female rotor-side cooling flow path 15A formed on the opposite side of the main casing 5 in the horizontal direction (in other words, the female rotor side) and connected to the discharge-side cooling flow path 13A; and a bearing-side cooling flow path 16A (refer to FIG. 16A ) formed on the upper side of the main casing 5 and closer to the discharge-side bearings 3A and 3B than the suction flow path 10 and connected between the male rotor-side cooling flow path 14A and the female rotor-side cooling flow path 15A. Figure 8 ).

[0053] In addition, the casing cooling flow path 12A has: an inlet 19 arranged on one side and the lower side of the main casing 5 in the horizontal direction; an outlet 20 arranged on the opposite side and the upper side of the main casing 5 in the horizontal direction; and a longitudinal rib 24 arranged in the female rotor side cooling flow path 15A in a manner extending in the vertical direction to promote the outflow of coolant from the female rotor side cooling flow path 15A.

[0054] Cooling water is supplied from the outside to the discharge side cooling channel 13A via the pipe 21A and the inlet 19, and flows in the discharge side cooling channel 13A. A portion of the cooling water flowing in the discharge side cooling channel 13A flows into the male rotor side cooling channel 14A, flows in the male rotor side cooling channel 14A and the bearing side cooling channel 16A in this order, and is discharged to the outside via the outlet 20 and the pipe 21B. A portion of the cooling water flowing in the discharge side cooling channel 13A flows into the female rotor side cooling channel 15A, flows in the female rotor side cooling channel 15A, and is discharged to the outside via the outlet 20 and the pipe 21B.

[0055] As the most significant feature of this embodiment, the casing cooling flow path 12A has: Fig.11 The transverse rib 22A is provided on the male rotor side cooling passage 14A in a manner extending in the left-right direction of the rotor; and the transverse rib 22A is provided in the rotor axial direction ( Fig.12 The transverse ribs 22A and 23A are provided in the cooling passage 15A on the female rotor side so as to extend in the left-right direction of the female rotor. Fig.11 and Fig.12 The position of the upper and lower directions) is the same as the axis center of the male rotor 1A and the axis center of the female rotor 1B.

[0056] The transverse rib 22A, for example, occupies 50 to 90% of the width of the male rotor side cooling channel 14A in the axial direction of the rotor, and inhibits the flow of coolant from the discharge side cooling channel 13A to the male rotor side cooling channel 14A. The transverse rib 23A, for example, occupies 50 to 90% of the width of the female rotor side cooling channel 15A in the axial direction of the rotor, and inhibits the flow of coolant from the discharge side cooling channel 13A to the female rotor side cooling channel 15A. As a result, the flow rate of cooling water in the male rotor side cooling channel 14A, the female rotor side cooling channel 15A, and the bearing side cooling channel 16A can be reduced, and the flow rate of cooling water in the discharge side cooling channel 13A can be increased in accordance with the reduced amount. As a result, the cooling force on the surrounding part of the discharge channel 11A can be increased, and the cooling efficiency can be improved.

[0057] In addition, in the present embodiment, the inlet 19 of the case cooling flow path 12A is provided at the lower side of the case 4, and the outlet 20 is provided at the upper side of the case 4. Thus, compared with the case where the inlet of the case cooling flow path 12A is provided at the upper side of the case 4 and the outlet is provided at the lower side of the case 4, it is possible to suppress the accumulation of air in the case cooling flow path 12A.

[0058] In the second embodiment, the inlet 19 of the case cooling flow path 12A is provided on one side and the lower side of the case 4 in the horizontal direction, and the outlet 20 is provided on the opposite side and the upper side of the case 4 in the horizontal direction. However, the present invention is not limited thereto. The outlet 20 of the case cooling flow path 12A may be provided on the upper side of the case 4 and in the horizontal direction between the axis of the male rotor 1A and the axis of the female rotor 1B (see the above). Figure 7 Alternatively, although not shown, the inlet 19 of the housing cooling channel 12A may be disposed on the opposite side and the lower side of the housing 4 in the horizontal direction, and the outlet 20 may be disposed on the one side and the upper side of the housing 4 in the horizontal direction.

[0059] In addition, in the second embodiment, the longitudinal ribs 24 are provided only in the cooling flow path 15A on the female rotor side, but the invention is not limited thereto. The longitudinal ribs 24 may be provided only in the cooling flow path 14A on the male rotor side, or in both the cooling flow path 14A on the male rotor side and the cooling flow path 15A on the female rotor side.

[0060] In the second embodiment, the vertical position of the transverse ribs 22A and 23A is the same as the axis of the male rotor 1A and the axis of the female rotor 1B, but the present invention is not limited thereto. The vertical position of the transverse ribs 22A and 23A may be closer to the discharge port 9 (i.e., lower side) than the axis of the male rotor 1A and the axis of the female rotor 1B.

[0061] In addition, the above description uses the case where the screw compressor is configured to transmit the rotational force of the male rotor 1A to the female rotor 1B through the meshing of the timing gear as an example, but it is not limited to this. For example, it can also be configured to transmit the rotational force of the male rotor 1A to the female rotor 1B through the meshing of the teeth of the male rotor 1A and the teeth of the female rotor 1B. In addition, the screw compressor is described as an example where the shaft of the male rotor 1A is connected to a rotating machine, but it is not limited to this. The shaft of the female rotor 1B can also be connected to a rotating machine. In addition, the screw compressor is described as an example of a non-liquid supply type (specifically, a method of compressing a gas such as air without supplying a liquid such as oil or water to the working chamber), but it is not limited to this. It can also be a liquid supply type (specifically, a method of supplying a liquid such as oil or water to the working chamber and compressing a gas such as air).

[0062] Description of Reference Numerals

[0063] 1A...male rotor, 1B...female rotor, 2A, 2B...intake side bearing, 3A, 3B...discharge side bearing, 4...housing, 8, 8A...intake port, 9, 9A...discharge port, 10, 10A...intake flow path, 11, 11A...discharge flow path, 12, 12A...housing cooling flow path, 13, 13A...discharge side cooling flow path, 14, 14A...male rotor side cooling flow path, 15, 15A...female rotor side cooling flow path, 16, 16A...bearing side cooling flow path, 17...longitudinal rib, 18...supply flow path, 19...inlet, 20...outlet, 22, 22A...transverse rib, 22, 23A...transverse rib, 24...longitudinal rib.

Claims

1. A screw compressor, comprising: A male rotor disposed on one side in the horizontal direction; a female rotor disposed on the opposite side in the horizontal direction and rotatable in a manner meshing with the male rotor; A suction side bearing and a discharge side bearing that rotatably support the male rotor and the female rotor; A housing that accommodates the male rotor, the female rotor, the suction-side bearing, and the discharge-side bearing, and forms a plurality of compression chambers in the tooth grooves of the male rotor and the female rotor; A suction flow path connecting a suction port formed on one side of the housing in a vertical direction with a compression chamber in a suction process; a discharge flow path that connects a discharge port formed on the opposite side of the housing in the vertical direction to the compression chamber in the discharge process; and a housing cooling flow path formed in the housing and through which a coolant flows, The screw compressor is characterized in that The shell cooling flow path has: a discharge side cooling flow path formed on the opposite side of the housing in the vertical direction and formed on the entire periphery of the discharge flow path; a male rotor side cooling flow path formed on the one side in the horizontal direction of the housing and capable of inflowing coolant from the discharge side cooling flow path; a female rotor side cooling flow path formed on the opposite side in the horizontal direction of the housing and capable of inflowing coolant from the discharge side cooling flow path; A first transverse rib is provided on the male rotor side cooling flow path in a manner extending in the rotor axial direction, and is used to suppress the flow of coolant from the discharge side cooling flow path into the male rotor side cooling flow path; and The second transverse rib is provided on the female rotor side cooling flow path in a manner extending in the rotor axial direction, and is used to suppress the coolant from flowing from the discharge side cooling flow path into the female rotor side cooling flow path.

2. The screw compressor according to claim 1, characterized in that: The positions of the first transverse rib and the second transverse rib in the vertical direction are the same as the axis of the male rotor and the axis of the female rotor, or are closer to the discharge port than the axis of the male rotor and the axis of the female rotor.

3. The screw compressor according to claim 1, characterized in that: The shell cooling flow path has: an inlet provided on the lower side of the housing and supplied with cooling liquid from the outside; and An outlet is provided on the upper side of the housing to discharge the coolant to the outside.

4. The screw compressor according to claim 3, characterized in that: The discharge port is formed on the upper side of the housing, The shell cooling flow path has: A longitudinal rib extending in a vertical direction and disposed on one side or an opposite side of the shell in a horizontal direction; and The supply flow path is separated from the male rotor side cooling flow path or the female rotor side cooling flow path by the longitudinal ribs, and can supply the cooling liquid supplied from the outside through the inlet to the discharge side cooling flow path.

5. The screw compressor according to claim 3, characterized in that: The discharge port is formed on the lower side of the housing, The casing cooling flow path has longitudinal ribs, which are arranged in a manner extending in a vertical direction on at least one of the male rotor side cooling flow path and the female rotor side cooling flow path, and can promote the outflow of coolant from at least one of the male rotor side cooling flow path and the female rotor side cooling flow path.

6. The screw compressor according to claim 1, characterized in that: The housing cooling flow path has a bearing side cooling flow path, which is formed on the one side in the vertical direction of the housing and closer to the discharge side bearing than the suction flow path, and is connected between the male rotor side cooling flow path and the female rotor side cooling flow path.

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