Compressor

Abstract

To provide a compressor having high cooling performance.SOLUTION: A compressor 1 includes: a low pressure stage compressor body 21 which suctions and compresses air; a water-cooling type intercooler 31 which cools compressed air discharged from the low pressure stage compressor body 21; a high pressure stage compressor body 22 which compresses compressed air cooled by the intercooler 31; a water-cooling type aftercooler 41 which cools compressed air discharged from the high pressure stage compressor body 22; a water-cooling type oil cooler 50 which cools an oil to be supplied to the low pressure stage compressor body 21 and the high pressure stage compressor body 22; and a coolant passage 6 in which a coolant flows. In the coolant passage 6, the intercooler 31, the aftercooler 41, and the oil cooler are arranged parallel to each other. Thus, portions of the coolant supplied to the intercooler 31, the aftercooler 41, and the oil cooler 50 do not interfere with each other.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a compressor. [Background technology]

[0002] Some compressors compress air in two stages: a low-pressure stage compressor body and a high-pressure stage compressor body. Such compressors are equipped with an intercooler that cools the compressed air discharged from the low-pressure stage compressor body and an aftercooler that cools the compressed air discharged from the high-pressure stage compressor body. In addition, the low-pressure stage compressor body and the high-pressure stage compressor body require oil to lubricate their drive units, and an oil cooler is also provided to cool the oil.

[0003] Patent Document 1 discloses a water-cooled oil-free screw compressor having a low-pressure stage compressor body, a high-pressure stage compressor body, an intercooler, an aftercooler, and an oil cooler. The intercooler, aftercooler, and oil cooler are water-cooled, that is, heat exchangers that use cooling water. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2001-153080 Summary of the Invention [Problem to be solved by the invention]

[0005] In Patent Document 1, the intercooler, aftercooler, and oil cooler are not directly connected to the cooling water source. In particular, the aftercooler and oil cooler are connected to the cooling water source via the intercooler and other components. Therefore, the aftercooler and oil cooler are supplied with cooling water that has been heated after passing through the intercooler. Therefore, there is room for improvement in cooling performance.

[0006] An object of the present invention is to provide a compressor having high cooling performance. [Means for solving the problem]

[0007] The present invention provides A low-pressure stage compressor main body that sucks in and compresses air; a water-cooled intercooler that cools the compressed air discharged from the low-pressure stage compressor body; a high-pressure stage compressor main body that compresses the compressed air cooled by the intercooler; a water-cooled aftercooler that cools the compressed air discharged from the high-pressure stage compressor body; a water-cooled oil cooler that cools oil supplied to the low-pressure stage compressor body and the high-pressure stage compressor body; A cooling water flow path through which cooling water flows; Equipped with The cooling water flow path has the intercooler, the aftercooler, and the oil cooler arranged in parallel, and the cooling water supplied to the intercooler, the aftercooler, and the oil cooler does not interfere with each other, thereby providing a compressor.

[0008] With this configuration, the cooling water flowing through the oil cooler, intercooler, and aftercooler does not interfere with each other, allowing low-temperature cooling water to be used for cooling. If cooling water heated in the intercooler were to be reused in the aftercooler or oil cooler, cooling performance would be reduced. Therefore, by suppressing the reuse of cooling water between the oil cooler, intercooler, and aftercooler, a compressor with high cooling performance can be provided. In particular, because the cooling performance of the intercooler affects the performance of the compressor, the cooling performance of the intercooler can be improved.

[0009] The intercooler and the aftercooler may be plate heat exchangers.

[0010] According to this configuration, the plate heat exchanger is smaller than other heat exchangers such as a tubular heat exchanger when achieving the same cooling efficiency, and therefore the intercooler and aftercooler can be made smaller.

[0011] The compressor is a water-cooled inter-cooler auxiliary cooler that cools the compressed air discharged from the low-pressure stage compressor body before the inter-cooler cools the compressed air; a water-cooled auxiliary after-cooler that cools the compressed air discharged from the high-pressure stage compressor body before the after-cooler cools the compressed air; may further comprise:

[0012] According to this configuration, by using the inter-cooler auxiliary cooler and the after-cooler auxiliary cooler, the temperature of the compressed air flowing into the inter-cooler and the after-cooler can be lowered, thereby reducing the cooling load on the inter-cooler and the after-cooler.

[0013] The inter-cooler auxiliary cooler may be disposed upstream of the intercooler in the cooling water flow path, The after-cooler may be disposed upstream of the after-cooler in the cooling water flow path.

[0014] This configuration reduces the temperature difference between the cooling water and compressed air that exchange heat in the intercooler and aftercooler compared to when an intercooler auxiliary cooler and an aftercooler auxiliary cooler are provided downstream of the intercooler and the aftercooler, respectively, in the cooling water flow path, thereby reducing the risk of thermal fatigue in the intercooler or aftercooler.

[0015] The inter-auxiliary cooler and the after-auxiliary cooler may be plate heat exchangers.

[0016] According to this configuration, the inter-auxiliary cooler and the after-auxiliary cooler can be made smaller than when the inter-auxiliary cooler and the after-auxiliary cooler are other types of heat exchangers such as tubular heat exchangers.

[0017] The inter-auxiliary cooler may include an inner pipe through which the compressed air passes and an outer pipe through which the cooling water passes, The after-auxiliary cooler may include an inner pipe through which the compressed air passes and an outer pipe through which the cooling water passes.

[0018] According to this configuration, the inter-auxiliary cooler and the after-auxiliary cooler are configured as double-pipe heat exchangers, which reduces the number of parts and provides high heat exchange performance compared to when the inter-auxiliary cooler and the after-auxiliary cooler are separate heat exchangers.

[0019] The oil cooler may be disposed in the cooling water flow path upstream of the low-pressure stage compressor body.

[0020] According to this configuration, the low-pressure stage compressor body is cooled with cooling water that has been cooled by the oil cooler, thereby making it possible to lower the temperature of the compressed air discharged from the low-pressure stage compressor body.

[0021] The high-pressure stage compressor body may be disposed downstream of the low-pressure stage compressor body in the cooling water flow path.

[0022] According to this configuration, the high-pressure stage compressor main body and the low-pressure stage compressor main body are arranged in series in the cooling water flow path, and therefore the cooling water flow path does not branch compared to when the high-pressure stage compressor main body and the low-pressure stage compressor main body are arranged in parallel, and therefore the amount of cooling water required can be reduced.

[0023] The low-pressure stage compressor body and the high-pressure stage compressor body may be oil-free screw type.

[0024] According to this configuration, since oil-free screw compressors require higher cooling performance than other oil-injected compressors, a compressor having high cooling performance as described above can function effectively. [Effects of the Invention]

[0025] According to the present invention, a compressor having high cooling performance can be provided. [Brief explanation of the drawings]

[0026] [Figure 1] 1 is an overall configuration diagram of a compressor according to a first embodiment. [Figure 2] FIG. 2 is a schematic configuration diagram of a cooling water flow path in the first embodiment. [Figure 3] FIG. 4 is a schematic configuration diagram of a first modified example of a cooling water flow path in the first embodiment. [Figure 4] FIG. 10 is a schematic configuration diagram of a third modified example of the cooling water flow path in the first embodiment. [Figure 5] FIG. 13 is a schematic configuration diagram of a seventh modified example of the cooling water flow path in the first embodiment. [Figure 6] FIG. 10 is an overall configuration diagram of a compressor according to a second embodiment. [Figure 7] FIG. 10 is a schematic configuration diagram of a cooling water flow path in a second embodiment. [Figure 8] FIG. 10 is a schematic configuration diagram of a coolant flow path of a compressor according to a third embodiment. [Figure 9] FIG. 10 is a schematic configuration diagram of a cooling water flow path in a third embodiment. [Figure 10] FIG. 10 is a schematic configuration diagram of a coolant flow path of a compressor according to a fourth embodiment. [Figure 11] FIG. 10 is a schematic configuration diagram of a cooling water flow path in a fourth embodiment. [Figure 12] FIG. 1 is a cross-sectional view showing an example of a double-pipe heat exchanger. DETAILED DESCRIPTION OF THE INVENTION

[0027] Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

[0028] (First embodiment) Referring to FIG. 1, compressor 1 is a two-stage oil-free screw type. However, the type of compressor 1 is not particularly limited and can be any type. For example, compressor 1 may be an oil-injected type. In an oil-free type (oil-less type), oil is not injected into the compression chamber, but in an oil-injected type, oil is injected into the compression chamber. Even in an oil-free type, lubricating oil may be supplied to driving parts such as bearings. Furthermore, compressor 1 may be a positive displacement type such as a reciprocating type or a scroll type, or a centrifugal type such as a turbo type.

[0029] In this embodiment, the compressor 1 has an intake filter 10, an intake control valve 11, a compressor main body 20, an inter-auxiliary cooler 30, an inter-cooler 31, an after-auxiliary cooler 40, an after-cooler 41, and an oil cooler 50.

[0030] The intake filter 10 removes foreign matter when external air is drawn in. The intake adjustment valve 11 adjusts the amount of air that has been removed of foreign matter by the intake filter 10 and is drawn in.

[0031] The compressor body 20 has a low-pressure stage compressor body 21 , a high-pressure stage compressor body 22 , a motor 23 , and a connection box 24 .

[0032] The low-pressure stage compressor body 21 has a low-pressure stage intake port 21a and a low-pressure stage discharge port 21b, compresses air drawn in through the low-pressure stage intake port 21a, and discharges it from the low-pressure stage discharge port 21b. The low-pressure stage compressor body 21 has an internal screw rotor that compresses air by rotating. The low-pressure stage compressor body 21 also has a low-pressure stage cooling jacket 21c on the outer periphery of a casing that defines the compression chamber. The low-pressure stage cooling jacket 21c is configured to allow cooling water to flow through it.

[0033] The high-pressure stage compressor body 22 has a high-pressure stage intake port 22a and a high-pressure stage discharge port 22b, compresses air drawn in through the high-pressure stage intake port 22a, and discharges it from the high-pressure stage discharge port 22b. The high-pressure stage compressor body 22 has an internal screw rotor that compresses the air as the screw rotor rotates. The high-pressure stage compressor body 22 also has a high-pressure stage cooling jacket 22c on the outer periphery of a casing that defines the compression chamber. The high-pressure stage cooling jacket 22c is configured to allow cooling water to flow through it.

[0034] The connection box 24 mechanically connects the motor 23, which is shown schematically, to the low-pressure stage compressor body 21 and the high-pressure stage compressor body 22. The connection box 24 houses a connection gear therein and transmits power from the motor 23 to the low-pressure stage compressor body 21 and the high-pressure stage compressor body 22 via the connection gear. The lower part of the connection box 24 serves as an oil reservoir 24a for storing oil. In the compressor 1, oil is supplied to the connection gear, bearings that support the screw rotor of the low-pressure stage compressor body 21, bearings that support the screw rotor of the high-pressure stage compressor body 22, etc. for lubrication, cooling, etc. The oil flows down to the oil reservoir 24a and is temporarily stored therein.

[0035] The inter-cooler auxiliary cooler 30 is water-cooled and cools the compressed air discharged from the low-pressure stage compressor body 21. For example, the inter-cooler auxiliary cooler 30 is a plate-type heat exchanger. The inter-cooler auxiliary cooler 30 exchanges heat between low-temperature cooling water supplied from the water supply source 6a and high-temperature compressed air discharged from the low-pressure stage compressor body 21. This heat exchange reduces the temperature of the compressed air and increases the temperature of the cooling water.

[0036] The intercooler 31 is a water-cooled type and further cools the compressed air cooled by the inter-auxiliary cooler 30. For example, the intercooler 31 is a plate-type heat exchanger. The intercooler 31 exchanges heat between the low-temperature cooling water supplied from the inter-auxiliary cooler 30 and the high-temperature compressed air supplied from the inter-auxiliary cooler 30. Due to this heat exchange, the temperature of the compressed air decreases and the temperature of the cooling water increases.

[0037] The intercooler 31 and the intercooler auxiliary cooler 30 may be the same. Alternatively, the intercooler auxiliary cooler 30 may be smaller than the intercooler 31 and have a lower cooling capacity (heat exchange performance).

[0038] The after-cooler 40 is a water-cooled type and cools the compressed air discharged from the high-pressure stage compressor body 22. For example, the after-cooler 40 is a plate-type heat exchanger. The after-cooler 40 exchanges heat between low-temperature cooling water supplied from the after-cooler 41 and high-temperature compressed air discharged from the high-pressure stage compressor body 22. This heat exchange reduces the temperature of the compressed air and increases the temperature of the cooling water.

[0039] The aftercooler 41 is a water-cooled type and further cools the compressed air cooled by the after-auxiliary cooler 40. For example, the aftercooler 41 is a plate-type heat exchanger. The aftercooler 41 exchanges heat between low-temperature cooling water supplied from the water supply source 6a and high-temperature compressed air supplied from the after-auxiliary cooler 40. Due to this heat exchange, the temperature of the compressed air decreases and the temperature of the cooling water increases.

[0040] The after-cooler 41 and the after-auxiliary cooler 40 may be the same. Alternatively, the after-auxiliary cooler 40 may be smaller than the after-cooler 41 and have a lower cooling capacity (heat exchange performance).

[0041] The oil cooler 50 is of a water-cooled type and cools the oil supplied from the oil reservoir 24a of the connection box 24. The type of oil cooler 50 is not particularly limited as long as it is of a water-cooled type, and any type may be used.

[0042] The compressor 1 of this embodiment is provided with an air passage 5 through which air flows, a cooling water passage 6 through which cooling water flows, and an oil passage 7 through which oil flows.

[0043] In the air flow path 5, an intake filter 10, an intake adjustment valve 11, a low-pressure stage compressor main body 21, an inter-auxiliary cooler 30, an inter-cooler 31, a high-pressure stage compressor main body 22, an after-auxiliary cooler 40, and an after-cooler 41 are arranged in this order.

[0044] In the air flow path 5, air is sucked from the outside into the low-pressure stage inlet port 21a of the low-pressure stage compressor main body 21 via the intake filter 10 and the intake adjustment valve 11. The air is compressed in the low-pressure stage compressor main body 21 and discharged as compressed air from the low-pressure stage outlet 21b. The compressed air is cooled by the inter-auxiliary cooler 30 and the intercooler 31 and is sucked into the high-pressure stage compressor main body 22 from the high-pressure stage inlet port 22a. The compressed air is further compressed in the high-pressure stage compressor main body 22 and is discharged from the high-pressure stage outlet 22b as higher-pressure compressed air. The compressed air is cooled by the after-auxiliary cooler 40 and the after-cooler 41 and is supplied to the supply destination 5a.

[0045] 2, the cooling water flow path 6 branches from a water supply source 6a into three flow paths. Specifically, the cooling water flow path 6 has a first cooling water flow path 6b, a second cooling water flow path 6c, and a third cooling water flow path 6d, which are arranged in parallel.

[0046] The first coolant flow path 6b is arranged with an inter-auxiliary cooler 30 and an inter-cooler 31 in this order. The coolant from the water supply source 6a is heated by the inter-auxiliary cooler 30, further heated by the inter-cooler 31, and then discharged from the discharge port 6e.

[0047] An after-cooler 41 and an after-auxiliary cooler 40 are arranged in this order in the second cooling water flow path 6c. The cooling water from the water supply source 6a is heated by the after-cooler 41, further heated by the after-auxiliary cooler 40, and then discharged from the discharge port 6e.

[0048] In the third cooling water flow path 6d, an oil cooler 50, a low-pressure stage cooling jacket 21c of the low-pressure stage compressor body 21, and a high-pressure stage cooling jacket 22c of the high-pressure stage compressor body 22 are arranged in this order. In other words, the oil cooler 50 is arranged upstream of the low-pressure stage compressor body 21 in the cooling water flow path 6. Furthermore, the high-pressure stage compressor body 22 is arranged downstream of the low-pressure stage compressor body 21 in the cooling water flow path 6. The cooling water from the water supply source 6a is heated in the oil cooler 50, further heated in the low-pressure stage cooling jacket 21c, further heated in the high-pressure stage cooling jacket 22c, and then discharged from the discharge port 6e.

[0049] In this way, the intercooler 31, aftercooler 41, and oil cooler 50 are arranged in parallel in the cooling water flow path 6, and the cooling water supplied to the intercooler 31, aftercooler 41, and oil cooler 50 is prevented from interfering with each other. In other words, the cooling water that has flowed through one of the intercooler 31, aftercooler 41, and oil cooler 50 is prevented from flowing into either of the other two of the intercooler 31, aftercooler 41, and oil cooler 50.

[0050] In the oil flow path 7, an oil cooler 50, the low-pressure stage compressor body 21, the high-pressure stage compressor body 22, and an oil reservoir 24a are arranged in this order for circulation. An oil filter 51 for filtering oil is arranged between the oil cooler 50 and the low-pressure stage compressor body 21 and the high-pressure stage compressor body 22. In addition, an oil pump 52 for circulating oil is arranged between the oil reservoir 24a and the oil cooler 50.

[0051] In the oil flow path 7, the oil cooled by the oil cooler 50 is supplied to the low-pressure stage compressor body 21 and the high-pressure stage compressor body 22 (more specifically, the drive parts such as bearings thereof). The oil is heated in the low-pressure stage compressor body 21 and the high-pressure stage compressor body 22 and is stored in the oil reservoir 24a. The oil stored in the oil reservoir 24a is sent to the oil cooler 50 and cooled in the oil cooler 50. The oil is then supplied again to the low-pressure stage compressor body 21 and the high-pressure stage compressor body 22. In this way, the oil flows through the oil flow path 7.

[0052] The compressor 1 of this embodiment provides the following advantages.

[0053] Because the cooling water flowing through the oil cooler 50, intercooler 31, and aftercooler 41 does not interfere with each other, low-temperature cooling water can be used for cooling. If cooling water heated in the intercooler 31 were to be reused in the aftercooler 41 or oil cooler 50, there is a risk that cooling performance would be reduced. Therefore, by suppressing the secondary reuse of cooling water between the oil cooler 50, intercooler 31, and aftercooler 41, it is possible to provide a compressor 1 with high cooling performance. In particular, because the cooling performance of the intercooler 31 affects the performance of the compressor 1, the cooling performance of the intercooler 31 can be improved.

[0054] Furthermore, the use of the inter-cooler auxiliary cooler 30 and the after-cooler auxiliary cooler 40 can lower the temperature of the compressed air flowing into the intercooler 31 and the aftercooler 41. Therefore, the cooling load on the intercooler 31 and the aftercooler 41 can be reduced.

[0055] Furthermore, by configuring the intercooler 31 and the aftercooler 41 as plate-type heat exchangers, it is possible to reduce the size of the intercooler 31 and the aftercooler 41. Similarly, by configuring the inter-auxiliary cooler 30 and the after-auxiliary cooler 40 as plate-type heat exchangers, it is possible to reduce the size of the inter-auxiliary cooler 30 and the after-auxiliary cooler 40.

[0056] Furthermore, since the oil cooler 50 is disposed upstream of the low-pressure stage compressor body 21 in the cooling water flow path 6, the low-pressure stage compressor body 21 can be cooled with the cooling water that has been cooled by the oil cooler 50. Therefore, compared to a case where the low-pressure stage compressor body 21 is not cooled with cooling water (for example, a case where the low-pressure stage compressor body 21 (casing of the low-pressure stage compressor) is cooled with air), the temperature of the compressed air discharged from the low-pressure stage compressor body 21 can be lowered.

[0057] Furthermore, since the high-pressure stage compressor body 22 and the low-pressure stage compressor body 21 are arranged in series in the cooling water flow path 6, the cooling water flow path 6 does not branch compared to when the high-pressure stage compressor body 22 and the low-pressure stage compressor body 21 are arranged in parallel (see Figures 5 and 6 described below), and therefore the amount of cooling water required can be reduced.

[0058] Furthermore, since oil-free screw compressors require higher cooling performance than other oil-injected compressors, the compressor 1 having high cooling performance as described above can function effectively.

[0059] First to ninth modified examples of the compressor 1 according to the first embodiment will be described with reference to FIGS.

[0060] In the first to ninth modified examples, the arrangement of some components in the cooling water flow path 6 differs from that of the above embodiment. Since the configuration is substantially the same except for the cooling water flow path 6, the overall configuration diagram and description of the compressor 1 corresponding to Fig. 1 will be omitted, and the description will be made using the schematic configuration diagram of the cooling water flow path 6 corresponding to Fig. 2.

[0061] 3, in the first modified example, the arrangement of the aftercooler 41 and the after-auxiliary cooler 40 in the second coolant flow path 6c is reversed from that in the above embodiment (FIG. 2). That is, the after-auxiliary cooler 40 is arranged upstream of the aftercooler 41 in the coolant flow path 6. Furthermore, the inter-auxiliary cooler 30 is arranged upstream of the intercooler 31 in the coolant flow path 6, similar to the above embodiment (FIG. 2).

[0062] In the cooling water flow path 6, the temperature difference between the cooling water and compressed air that exchange heat in the intercooler 31 and the aftercooler 41 can be made smaller than when the intercooler auxiliary cooler 30 and the aftercooler auxiliary cooler 40 are provided downstream of the intercooler 31 and the aftercooler 41, respectively. Therefore, the risk of thermal fatigue in the intercooler 31 and the aftercooler 41 can be reduced.

[0063] In the second modified example, the positions of the intercooler 31 and the inter-auxiliary cooler 30 in the first coolant flow path 6b are reversed from those in the above embodiment (FIG. 2). That is, the inter-auxiliary cooler 30 is disposed downstream of the intercooler 31 in the coolant flow path 6. Furthermore, the after-auxiliary cooler 40 is disposed downstream of the after-cooler 41 in the coolant flow path 6, similar to the above embodiment (FIG. 2).

[0064] Referring to Figure 4, the third modified example is modified from the first modified example (Figure 3) so that the low-pressure stage cooling jacket 21c of the low-pressure stage compressor body 21 and the high-pressure stage cooling jacket 22c of the high-pressure stage compressor body 22 are arranged in parallel in the third cooling water flow path 6d.

[0065] In the fourth modified example, the third cooling water flow path 6d is modified from the second modified example so that the low-pressure stage cooling jacket 21c of the low-pressure stage compressor body 21 and the high-pressure stage cooling jacket 22c of the high-pressure stage compressor body are arranged in parallel.

[0066] In the fifth modified example, the arrangement of the low-pressure stage cooling jacket 21c of the low-pressure stage compressor body 21 and the high-pressure stage cooling jacket 22c of the high-pressure stage compressor body 22 in the third cooling water flow path 6d is reversed from that in the first modified example (FIG. 3). Therefore, the high-pressure stage cooling jacket 22c of the high-pressure stage compressor body 22 is arranged upstream of the low-pressure stage cooling jacket 21c of the low-pressure stage compressor body 21.

[0067] In the sixth modified example, the arrangement of the low-pressure stage cooling jacket 21c of the low-pressure stage compressor body 21 and the high-pressure stage cooling jacket 22c of the high-pressure stage compressor body 22 in the third cooling water flow path 6d is reversed from that in the second modified example.

[0068] 5, the seventh modified example is different from the second modified example in that the first coolant flow path 6b and the second coolant flow path 6c join together after exiting the intercooler 31 and the aftercooler 41. In the joined first coolant flow path 6b and second coolant flow path 6c, the inter-auxiliary cooler 30 is disposed upstream of the after-auxiliary cooler 40. The inter-auxiliary cooler 30 and the after-auxiliary cooler 40 may be the same.

[0069] In the eighth modified example, the seventh modified example (Figure 5) is modified so that the low-pressure stage cooling jacket 21c of the low-pressure stage compressor body 21 and the high-pressure stage cooling jacket 22c of the high-pressure stage compressor body 22 are arranged in parallel in the third cooling water flow path 6d.

[0070] In the ninth modified example, the arrangement of the low-pressure stage cooling jacket 21c of the low-pressure stage compressor body 21 and the high-pressure stage cooling jacket 22c of the high-pressure stage compressor body 22 in the third cooling water flow path 6d is reversed from that in the eighth modified example. That is, the high-pressure stage cooling jacket 22c of the high-pressure stage compressor body 22 is arranged upstream of the low-pressure stage cooling jacket 21c of the low-pressure stage compressor body 21.

[0071] (Second embodiment) 6 and 7, the compressor 1 of the second embodiment is different from the first embodiment in that it does not have the low-pressure stage cooling jacket 21c of the low-pressure stage compressor body 21 and the high-pressure stage cooling jacket 22c of the high-pressure stage compressor body 22. Other than these parts, the compressor 1 is substantially the same as the first embodiment. Therefore, the description of the parts shown in the first embodiment may be omitted.

[0072] In this embodiment, the low-pressure stage cooling jacket 21c of the low-pressure stage compressor body 21 and the high-pressure stage cooling jacket 22c of the high-pressure stage compressor body 22 are omitted from the third cooling water flow path 6d. Therefore, only the oil cooler 50 is arranged in the third cooling water flow path 6d. In the third cooling water flow path 6d, the cooling water from the water supply source 6a is heated by the oil cooler 50 and is discharged from the discharge port 6e.

[0073] Hereinafter, first to third modified examples of the compressor 1 according to the second embodiment will be described.

[0074] In the first to third modified examples, the arrangement of some of the components in the cooling water flow path 6 differs from that of the second embodiment. Since the configuration is substantially the same except for the cooling water flow path 6, the overall configuration diagram and description of the compressor 1 corresponding to Fig. 6 will be omitted, and the description will be made using a schematic configuration diagram of the cooling water flow path 6 corresponding to Fig. 7.

[0075] In the first modified example, the positions of the aftercooler 41 and the after auxiliary cooler 40 in the second coolant flow path 6c are reversed from those in the above embodiment (FIG. 7). That is, the after auxiliary cooler 40 is arranged upstream of the aftercooler 41 in the coolant flow path 6. Also, the inter auxiliary cooler 30 is arranged upstream of the intercooler 31 in the coolant flow path 6, similar to the second embodiment (FIG. 7).

[0076] In the second modified example, the positions of the intercooler 31 and the inter-auxiliary cooler 30 in the first coolant flow path 6b are reversed from those in the above embodiment (FIG. 7). That is, the inter-auxiliary cooler 30 is disposed downstream of the intercooler 31 in the coolant flow path 6. Furthermore, the after-auxiliary cooler 40 is disposed downstream of the after-cooler 41 in the coolant flow path 6, similar to the second embodiment (FIG. 7).

[0077] In the third modified example, the first coolant flow path 6b and the second coolant flow path 6c are modified from the second modified example so that they merge after exiting the intercooler 31 and the aftercooler 41. In the merged first coolant flow path 6b and second coolant flow path 6c, the inter-auxiliary cooler 30 is disposed upstream of the after-auxiliary cooler 40. Note that the inter-auxiliary cooler 30 and the after-auxiliary cooler 40 may be the same.

[0078] (Third embodiment) 8 and 9, the compressor 1 of the third embodiment is different from the first embodiment in that the inter-auxiliary cooler 30 and the after-auxiliary cooler 40 are omitted. Other parts are substantially the same as those of the first embodiment. Therefore, the description of parts shown in the first embodiment may be omitted.

[0079] In this embodiment, the inter-auxiliary cooler 30 is omitted from the first cooling water flow path 6b, and the after-auxiliary cooler 40 is omitted from the second cooling water flow path 6c. Therefore, only the inter-cooler 31 is arranged in the first cooling water flow path 6b, and only the after-cooler 41 is arranged in the second cooling water flow path 6c.

[0080] In the first coolant flow path 6b, the coolant from the water supply source 6a is heated in the intercooler 31 and then discharged from the outlet 6e. In the second coolant flow path 6c, the coolant from the water supply source 6a is heated in the aftercooler 41 and then discharged from the outlet 6e.

[0081] (Fourth embodiment) 10 and 11 , the compressor 1 of the fourth embodiment has been modified such that the low-pressure stage cooling jacket 21c of the low-pressure stage compressor body 21, the high-pressure stage cooling jacket 22c of the high-pressure stage compressor body 22, the inter-auxiliary cooler 30, and the after-auxiliary cooler 40 are omitted from the first embodiment. Other than these parts, the compressor 1 is substantially the same as the first embodiment. Therefore, the description of the parts shown in the first embodiment may be omitted.

[0082] In this embodiment, the inter-cooler 30 is omitted from the first cooling water flow path 6b, the after-cooler 40 is omitted from the second cooling water flow path 6c, and the low-pressure stage cooling jacket 21c of the low-pressure stage compressor body 21 and the high-pressure stage cooling jacket 22c of the high-pressure stage compressor body 22 are omitted from the third cooling water flow path 6d. Therefore, only the intercooler 31 is arranged in the first cooling water flow path 6b, only the aftercooler 41 is arranged in the second cooling water flow path 6c, and only the oil cooler 50 is arranged in the third cooling water flow path 6d.

[0083] In the first coolant flow path 6b, the coolant from the water supply source 6a is heated in the intercooler 31 and then discharged from the outlet 6e. In the second coolant flow path 6c, the coolant from the water supply source 6a is heated in the aftercooler 41 and then discharged from the outlet 6e. In the third coolant flow path 6d, the coolant from the water supply source 6a is heated in the oil cooler 50 and then discharged from the outlet 6e.

[0084] Although specific embodiments of the present invention and their modifications have been described above, the present invention is not limited to the above-described embodiments and can be implemented with various modifications within the scope of the present invention.

[0085] 12, the inter-cooler 30 and the after-cooler 40 may be double-pipe heat exchangers. Specifically, the inter-cooler 30 may include an inner pipe 30a through which compressed air passes and an outer pipe 30b through which cooling water passes. Similarly, the after-cooler 40 may include an inner pipe 40a through which compressed air passes and an outer pipe 40b through which cooling water passes. This reduces the number of parts in the inter-cooler 30 and the after-cooler 40 and enables high heat exchange performance to be achieved compared to when the inter-cooler 30 and the after-cooler 40 are separate heat exchangers.

[0086] The present disclosure may include the following aspects. (Aspect 1) A low-pressure stage compressor main body that sucks in and compresses air; a water-cooled intercooler that cools the compressed air discharged from the low-pressure stage compressor body; a high-pressure stage compressor main body that compresses the compressed air cooled by the intercooler; a water-cooled aftercooler that cools the compressed air discharged from the high-pressure stage compressor body; a water-cooled oil cooler that cools oil supplied to the low-pressure stage compressor body and the high-pressure stage compressor body; A cooling water flow path through which cooling water flows; Equipped with the intercooler, the aftercooler, and the oil cooler are arranged in parallel in the cooling water flow path, and the cooling water supplied to the intercooler, the aftercooler, and the oil cooler does not interfere with each other. (Aspect 2) 2. The compressor of claim 1, wherein the intercooler and the aftercooler are plate heat exchangers. (Aspect 3) a water-cooled inter-cooler auxiliary cooler that cools the compressed air discharged from the low-pressure stage compressor body before the inter-cooler cools the compressed air; a water-cooled auxiliary after-cooler that cools the compressed air discharged from the high-pressure stage compressor body before the after-cooler cools the compressed air; 3. The compressor of embodiment 1 or 2, further comprising: (Aspect 4) the inter-cooler auxiliary is disposed upstream of the intercooler in the cooling water flow path, Aspect 4. The compressor according to aspect 3, wherein the after-cooler is disposed upstream of the after-cooler in the cooling water flow path. (Aspect 5) 5. The compressor according to claim 3 or 4, wherein the inter-auxiliary cooler and the after-auxiliary cooler are plate heat exchangers. (Aspect 6) the inter-auxiliary cooler includes an inner pipe through which the compressed air passes and an outer pipe through which the cooling water passes, Aspect 6. The compressor according to any one of aspects 3 to 5, wherein the after-auxiliary cooler includes an inner pipe through which the compressed air passes and an outer pipe through which the cooling water passes. (Aspect 7) Aspect 7. The compressor according to any one of aspects 1 to 6, wherein the oil cooler is disposed in the cooling water flow path upstream of the low-pressure stage compressor body. (Aspect 8) Aspect 8. The compressor according to any one of aspects 1 to 7, wherein the high-pressure stage compressor body is disposed downstream of the low-pressure stage compressor body in the cooling water flow path. (Aspect 9) Aspect 9. The compressor according to any one of aspects 1 to 8, wherein the low-pressure stage compressor body and the high-pressure stage compressor body are oil-free screw compressors. [Explanation of symbols]

[0087] 1 Compressor 5 Air flow path 5a Supply destination 6 Cooling water flow path 6a Water source 6b 1st cooling water flow path 6c 2nd cooling water flow path 6d Third cooling water flow path 6e Outlet 7 Oil flow path 10. Intake filter 11 Intake adjustment valve 20 Compressor body 21 Low-pressure stage compressor body 21a Low pressure stage intake 21b High-pressure stage outlet 21c Low pressure stage cooling jacket 22 High-pressure stage compressor body 22a High pressure stage intake 22b High-pressure stage outlet 22c High pressure stage cooling jacket 23 Motor 24 Connection box 24a Oil storage section 30 Intercooler auxiliary cooler 30a inner tube 30b outer tube 31 Intercooler 40 After-cooler 40a inner tube 40b outer tube 41 Aftercooler 50 Oil cooler 51 Oil filter 52 Oil pump

Claims

1. A low-pressure stage compressor main body that sucks in and compresses air; a water-cooled intercooler that cools the compressed air discharged from the low-pressure stage compressor body; a high-pressure stage compressor main body that compresses the compressed air cooled by the intercooler; a water-cooled aftercooler that cools the compressed air discharged from the high-pressure stage compressor body; a water-cooled oil cooler that cools oil supplied to the low-pressure stage compressor body and the high-pressure stage compressor body; A cooling water flow path through which cooling water flows; Equipped with the intercooler, the aftercooler, and the oil cooler are arranged in parallel in the cooling water flow path, and the cooling water supplied to the intercooler, the aftercooler, and the oil cooler does not interfere with each other.

2. The compressor according to claim 1 , wherein the intercooler and the aftercooler are plate heat exchangers.

3. a water-cooled inter-cooler auxiliary cooler that cools the compressed air discharged from the low-pressure stage compressor body before the inter-cooler cools the compressed air; a water-cooled auxiliary after-cooler that cools the compressed air discharged from the high-pressure stage compressor body before the after-cooler cools the compressed air; The compressor of claim 1 further comprising:

4. the inter-cooler auxiliary is disposed upstream of the intercooler in the cooling water flow path, The compressor according to claim 3 , wherein the after-cooler is disposed upstream of the after-cooler in the cooling water flow path.

5. The compressor according to claim 3 , wherein the inter-auxiliary cooler and the after-auxiliary cooler are plate heat exchangers.

6. the inter-auxiliary cooler includes an inner pipe through which the compressed air passes and an outer pipe through which the cooling water passes, The compressor according to claim 3 , wherein the after-auxiliary cooler includes an inner pipe through which the compressed air passes and an outer pipe through which the cooling water passes.

7. The compressor according to claim 1 , wherein the oil cooler is disposed upstream of the low-pressure stage compressor body in the cooling water flow path.

8. The compressor according to claim 1 , wherein the high-pressure stage compressor body is disposed downstream of the low-pressure stage compressor body in the cooling water flow path.

9. The compressor according to claim 1 , wherein the low-pressure stage compressor body and the high-pressure stage compressor body are oil-free screw compressors.

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