Compressor

Abstract

The invention provides a compressor with high cooling performance. A compressor (1) is provided with: a low-pressure-stage compressor body (21) that sucks in and compresses air; a water-cooled intercooler (31) for cooling the compressed air discharged from the low-pressure-stage compressor main body (21); a high-pressure stage compressor body (22) that compresses the compressed air cooled by the intercooler (31); a water-cooled aftercooler (41) for cooling the compressed air discharged from the high-pressure stage compressor main body (22); a water-cooled oil cooler (50) that cools oil supplied to the low-pressure-stage compressor body (21) and the high-pressure-stage compressor body (22); and a cooling water flow path (6) through which cooling water flows. An intercooler (31), an after-cooler (41), and an oil cooler (50) are arranged in parallel in a cooling water flow path (6). The cooling water supplied to the intercooler (31), the aftercooler (41), and the oil cooler (50) does not interfere with each other.

Description

TECHNICAL FIELD

[0001] The present application relates to a compressor. BACKGROUND

[0002] In a compressor, there is a compressor that compresses air by two stages of a low-pressure stage compressor main body and a high-pressure stage compressor main body. In such a compressor, an intercooler that cools compressed air discharged from the low-pressure stage compressor main body and an aftercooler that cools compressed air discharged from the high-pressure stage compressor main body are provided. Further, the low-pressure stage compressor main body and the high-pressure stage compressor main body require oil for lubrication of a driving section, and an oil cooler that cools the oil is also provided.

[0003] In Patent Literature 1, a water-cooled oil-free screw compressor having a low-pressure stage compressor main body, a high-pressure stage compressor main body, an intercooler, an aftercooler, and an oil cooler is disclosed. The intercooler, the aftercooler, and the oil cooler are water-cooled, that is, become heat exchangers that utilize cooling water.

[0004] PRIOR ART DOCUMENTS

[0005] PATENT LITERATURE

[0006] Patent Literature 1: Japanese Patent Application Laid-Open No. 2001-153080 SUMMARY

[0007] PROBLEMS TO BE SOLVED BY THE INVENTION

[0008] In Patent Literature 1, the intercooler, the aftercooler, and the oil cooler are not directly connected to a cooling water source. In particular, the aftercooler and the oil cooler are connected to the cooling water source via the intercooler and other components. Thus, the aftercooler and the oil cooler are supplied with cooling water that has been warmed by the intercooler. Therefore, there is room for improvement in cooling performance.

[0009] The present application relates to a compressor.

[0010] MEANS FOR SOLVING THE PROBLEMS

[0011] The present application provides a compressor, comprising: a low-pressure stage compressor main body that sucks in and compresses air; a water-cooled intercooler that cools compressed air discharged from the low-pressure stage compressor main 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 main body; a water-cooled oil cooler that cools oil supplied to the low-pressure stage compressor main body and the high-pressure stage compressor main body; and a cooling water flow path through which cooling water flows; wherein 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.

[0012] According to this structure, since the cooling water flowing in the oil cooler, the intercooler, and the aftercooler does not interfere with each other, low-temperature cooling water can be used for cooling. If the cooling water warmed by the intercooler is used twice by the aftercooler and the oil cooler, the cooling performance decreases. Therefore, by suppressing the reuse of the cooling water among the oil cooler, the intercooler, and the aftercooler, a compressor with higher cooling performance can be provided. In particular, since the cooling performance of the intercooler affects the performance of the compressor, the cooling performance of the intercooler can be improved.

[0013] The intercooler and the aftercooler can be plate heat exchangers.

[0014] According to this structure, since the plate heat exchanger is smaller than other heat exchangers such as a tube heat exchanger while achieving the same cooling efficiency, the intercooler and the aftercooler can be downsized.

[0015] The compressor can further comprise: a water-cooled inter-assistant cooler that cools the compressed air discharged from the low-pressure stage compressor main body before the intercooler; and a water-cooled after-assistant cooler that cools the compressed air discharged from the high-pressure stage compressor main body before the aftercooler.

[0016] According to this structure, by using the inter-assistant cooler and the after-assistant cooler, the temperature of the compressed air flowing into the intercooler and the aftercooler can be reduced. Therefore, the cooling load in the intercooler and the aftercooler can be reduced.

[0017] The inter-assistant cooler can be arranged upstream of the intercooler in the cooling water flow path; and the after-assistant cooler can be arranged upstream of the aftercooler in the cooling water flow path.

[0018] According to this structure, compared to the case where an intermediate auxiliary cooler and an aftercooler are respectively installed downstream of the intercooler and aftercooler in the cooling water flow path, the temperature difference between the cooling water exchanging heat with the compressed air via the intercooler and aftercooler can be reduced. Therefore, the risk of thermal fatigue of the intercooler or aftercooler can be reduced.

[0019] The aforementioned intermediate auxiliary cooler and the aforementioned post-auxiliary cooler can also be plate heat exchangers.

[0020] According to this structure, compared with other types of heat exchangers such as tubular heat exchangers, the intermediate auxiliary cooler and the post-auxiliary cooler can be miniaturized.

[0021] The aforementioned intermediate auxiliary cooler may also include the aforementioned inner pipe through which compressed air passes and the aforementioned outer pipe through which cooling water passes; the aforementioned post-auxiliary cooler may also include the aforementioned inner pipe through which compressed air passes and the aforementioned outer pipe through which cooling water passes.

[0022] According to this structure, the intermediate auxiliary cooler and the post-auxiliary cooler are configured as a double-layer tubular heat exchanger. Therefore, compared with the case where the intermediate auxiliary cooler and the post-auxiliary cooler are separate heat exchangers, the number of parts is reduced, and higher heat exchange performance can be achieved.

[0023] The aforementioned oil cooler can also be configured in the aforementioned cooling water flow path upstream of the aforementioned low-pressure stage compressor body.

[0024] According to this structure, by cooling the low-pressure stage compressor body with cooling water cooled by the oil cooler, the temperature of the compressed air ejected from the low-pressure stage compressor body can be reduced.

[0025] The aforementioned high-pressure stage compressor body can also be configured downstream of the aforementioned low-pressure stage compressor body in the aforementioned cooling water flow path.

[0026] According to this structure, since the high-pressure stage compressor body and the low-pressure stage compressor body are connected in series in the cooling water flow path, the amount of cooling water required can be reduced compared with the case where the high-pressure stage compressor body and the low-pressure stage compressor body are connected in parallel, since the cooling water flow path does not branch.

[0027] The aforementioned low-pressure stage compressor body and the aforementioned high-pressure stage compressor body can also be oil-free screw type.

[0028] Based on this structure, the oil-free screw compressor requires higher cooling performance compared to other oil-supply compressors, so the compressor with higher cooling performance, as described above, can function effectively.

[0029] Invention Effects

[0030] According to the present invention, a compressor with high cooling performance can be provided. Attached Figure Description

[0031] Figure 1 This is an overall structural diagram of the compressor according to the first embodiment.

[0032] Figure 2 This is a schematic diagram of the cooling water flow path in the first embodiment.

[0033] Figure 3 This is a schematic structural diagram of a first variation of the cooling water flow path in the first embodiment.

[0034] Figure 4 This is a schematic structural diagram of a third variation of the cooling water flow path in the first embodiment.

[0035] Figure 5 This is a schematic structural diagram of the seventh variation of the cooling water flow path in the first embodiment.

[0036] Figure 6 This is an overall structural diagram of the compressor according to the second embodiment.

[0037] Figure 7 This is a schematic diagram of the cooling water flow path in the second embodiment.

[0038] Figure 8 This is a schematic structural diagram of the cooling water flow path of the compressor in the third embodiment.

[0039] Figure 9 This is a schematic diagram of the cooling water flow path in the third embodiment.

[0040] Figure 10 This is a schematic structural diagram of the cooling water flow path of the compressor in the fourth embodiment.

[0041] Figure 11 This is a schematic diagram of the cooling water flow path in the fourth embodiment.

[0042] Figure 12 This is a cross-sectional view showing an example of a double-tube heat exchanger. Detailed Implementation

[0043] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

[0044] (First Embodiment)

[0045] Reference Figure 1Compressor 1 is a two-stage oil-free screw compressor. However, the type of compressor 1 is not particularly limited and can be arbitrary. For example, compressor 1 can also be an oil-supply type. In an oil-free type (oil-free type), oil is not supplied to the compression chamber, but in an oil-supply type, oil is supplied to the compression chamber. Even in an oil-free type, lubricating oil can be supplied to drive components such as bearings. Furthermore, compressor 1 can be a positive displacement type such as a reciprocating or scroll type, or a centrifugal type such as a turbine type.

[0046] In this embodiment, the compressor 1 includes an intake filter 10, an intake regulating valve 11, a compressor body 20, an intermediate auxiliary cooler 30, an intermediate cooler 31, an after-auxiliary cooler 40, an after-cooler 41, and an oil cooler 50.

[0047] The intake filter 10 removes foreign objects when drawing in outside air. The intake regulating valve 11 adjusts the intake volume of air after the foreign objects have been removed by the intake filter 10.

[0048] The compressor body 20 includes a low-pressure stage compressor body 21, a high-pressure stage compressor body 22, a motor 23, and a connecting box 24.

[0049] The low-pressure stage compressor body 21 has a low-pressure stage intake port 21a and a low-pressure stage outlet 21b, which compresses the air drawn in from the low-pressure stage intake port 21a and ejects it from the low-pressure stage outlet 21b. The low-pressure stage compressor body 21 has a screw rotor inside, which compresses the air by rotating. Furthermore, the low-pressure stage compressor body 21 has a low-pressure stage cooling jacket 21c on the outer periphery of the casing defining the compression chamber. The low-pressure stage cooling jacket 21c is configured to allow cooling water to flow through it.

[0050] The high-pressure stage compressor body 22 has a high-pressure stage intake port 22a and a high-pressure stage outlet 22b, which compresses the air drawn in from the high-pressure stage intake port 22a and ejects it from the high-pressure stage outlet 22b. The high-pressure stage compressor body 22 has a screw rotor inside, which compresses the air by rotating. Furthermore, the high-pressure stage compressor body 22 has a high-pressure stage cooling jacket 22c on the outer periphery of the casing defining the compression chamber. The high-pressure stage cooling jacket 22c is configured to allow cooling water to flow through it.

[0051] The connecting housing 24 mechanically connects the schematically shown motor 23 to the low-pressure compressor body 21 and the high-pressure compressor body 22. The connecting housing 24 internally houses a connecting gear, through which power from the motor 23 is transmitted to the low-pressure compressor body 21 and the high-pressure compressor body 22. The lower part of the connecting housing 24 becomes an oil reservoir 24a. In the compressor 1, oil is supplied to the connecting gear, the bearings supporting the screw rotor of the low-pressure compressor body 21, and the bearings supporting the screw rotor of the high-pressure compressor body 22 for lubrication, cooling, etc. This oil flows down to the oil reservoir 24a and is temporarily stored there.

[0052] The intercooler 30 is water-cooled and cools the compressed air ejected from the low-pressure stage compressor body 21. For example, the intercooler 30 is a plate heat exchanger. The intercooler 30 performs heat exchange between the low-temperature cooling water supplied from the water supply source 6a and the high-temperature compressed air ejected from the low-pressure stage compressor body 21. Through this heat exchange, the temperature of the compressed air decreases and the temperature of the cooling water increases.

[0053] Intercooler 31 is water-cooled and further cools the compressed air after it has been cooled by intercooler 30. For example, intercooler 31 is a plate heat exchanger. Intercooler 31 performs heat exchange between the low-temperature cooling water supplied from intercooler 30 and the high-temperature compressed air supplied from intercooler 30. Through this heat exchange, the temperature of the compressed air decreases and the temperature of the cooling water increases.

[0054] Intercooler 31 and intercooler 30 may be the same cooler. Alternatively, intercooler 30 may be a smaller cooler with lower cooling capacity (heat exchange performance) compared to intercooler 31.

[0055] The aftercooler 40 is water-cooled and cools the compressed air ejected from the high-pressure stage compressor body 22. For example, the aftercooler 40 is a plate heat exchanger. The aftercooler 40 exchanges heat between the low-temperature cooling water supplied from the aftercooler 41 and the high-temperature compressed air ejected from the high-pressure stage compressor body 22. Through this heat exchange, the temperature of the compressed air decreases and the temperature of the cooling water increases.

[0056] The aftercooler 41 is water-cooled and further cools the compressed air that has been cooled by the aftercooler 40. For example, the aftercooler 41 is a plate heat exchanger. The aftercooler 41 performs heat exchange between the low-temperature cooling water supplied from the water supply source 6a and the high-temperature compressed air supplied from the aftercooler 40. Through this heat exchange, the temperature of the compressed air decreases and the temperature of the cooling water increases.

[0057] The aftercooler 41 and the auxiliary aftercooler 40 may be the same cooler. Alternatively, the auxiliary aftercooler 40 may be a smaller cooler with lower cooling capacity (heat exchange performance) compared to the aftercooler 41.

[0058] The oil cooler 50 is water-cooled and cools the oil supplied from the oil storage section 24a of the connecting box 24. The type of oil cooler 50 is not particularly limited as long as it is water-cooled and can be any type.

[0059] In the compressor 1 of this embodiment, there is an air flow path 5 for air flow, a cooling water flow path 6 for cooling water flow, and an oil flow path 7 for oil flow.

[0060] In the airflow path 5, an intake filter 10, an intake regulating valve 11, a low-pressure stage compressor body 21, an intermediate auxiliary cooler 30, an intermediate cooler 31, a high-pressure stage compressor body 22, an after-auxiliary cooler 40, and an after-cooler 41 are arranged in sequence.

[0061] In airflow path 5, air is drawn from the outside into the low-pressure stage intake port 21a of the low-pressure stage compressor body 21 via the intake filter 10 and intake regulating valve 11. This air is compressed by the low-pressure stage compressor body 21 and ejected as compressed air from the low-pressure stage outlet 21b. This compressed air is cooled by the intercooler 30 and intercooler 31 and drawn into the high-pressure stage compressor body 22 from the high-pressure stage intake port 22a. This compressed air is further compressed by the high-pressure stage compressor body 22 and ejected as higher-pressure compressed air from the high-pressure stage outlet 22b. This compressed air is cooled by the aftercooler 40 and aftercooler 41 and supplied to the supply destination 5a.

[0062] Simultaneously refer to Figure 2 The cooling water flow path 6 branches into three flow paths from the water supply source 6a. 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 configured in parallel.

[0063] In the first cooling water flow path 6b, an intermediate auxiliary cooler 30 and an intermediate cooler 31 are arranged in sequence. The cooling water from the water supply source 6a is heated by the intermediate auxiliary cooler 30 and further heated by the intermediate cooler 31 before being discharged from the outlet 6e.

[0064] In the second cooling water flow path 6c, an aftercooler 41 and an auxiliary aftercooler 40 are arranged in sequence. The cooling water from the water supply source 6a is heated by the aftercooler 41 and further heated by the auxiliary aftercooler 40 before being discharged from the outlet 6e.

[0065] 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 sequentially. In other words, the oil cooler 50 is located 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 located downstream of the low-pressure stage compressor body 21 in the cooling water flow path 6. Cooling water from the water supply source 6a is heated by the oil cooler 50, further heated by the low-pressure stage cooling jacket 21c, and further heated by the high-pressure stage cooling jacket 22c before being discharged from the outlet 6e.

[0066] In this way, the intercooler 31, aftercooler 41, and oil cooler 50 are arranged in parallel in the cooling water flow path 6, so that the cooling water supplied to the intercooler 31, aftercooler 41, and oil cooler 50 does not interfere with each other. That is, the cooling water flowing in one of the intercooler 31, aftercooler 41, and oil cooler 50 does not flow into any of the other two of the intercooler 31, aftercooler 41, and oil cooler 50.

[0067] In the oil flow path 7, an oil cooler 50, a low-pressure stage compressor body 21, a high-pressure stage compressor body 22, and an oil storage section 24a are sequentially arranged in a circulating manner. 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. Furthermore, an oil pump 52 for facilitating oil flow is arranged between the oil storage section 24a and the oil cooler 50.

[0068] In oil flow path 7, oil cooled by oil cooler 50 is supplied to the low-pressure stage compressor body 21 and the high-pressure stage compressor body 22 (specifically, their bearings and other drive components). The oil is heated by the low-pressure stage compressor body 21 and the high-pressure stage compressor body 22 and stored in oil storage section 24a. The oil stored in oil storage section 24a is transported to oil cooler 50 and cooled by it. Then, the oil is supplied again to the low-pressure stage compressor body 21 and the high-pressure stage compressor body 22. Thus, oil flow path 7 is circulated.

[0069] The compressor 1 according to this embodiment has the following effects.

[0070] Since the cooling water flowing in the oil cooler 50, intercooler 31, and aftercooler 41 does not interfere with each other, the low-temperature cooling water can be used for cooling. If the cooling water heated by the intercooler 31 is reused in the aftercooler 41 and oil cooler 50, the cooling performance may decrease. Therefore, by suppressing the reuse of cooling water between the oil cooler 50, intercooler 31, and aftercooler 41, a compressor 1 with higher cooling performance can be provided. In particular, since the cooling performance of the intercooler 31 affects the performance of the compressor 1, the cooling performance of the intercooler 31 can be improved.

[0071] Furthermore, by using the intercooler 30 and the aftercooler 40, the temperature of the compressed air flowing into the intercooler 31 and the aftercooler 41 can be reduced. As a result, the cooling load in the intercooler 31 and the aftercooler 41 can be reduced.

[0072] Furthermore, by using plate heat exchangers to construct the intercooler 31 and the aftercooler 41, the intercooler 31 and the aftercooler 41 can be miniaturized. Similarly, by using plate heat exchangers to construct the intermediate auxiliary cooler 30 and the after auxiliary cooler 40, the intermediate auxiliary cooler 30 and the after auxiliary cooler 40 can be miniaturized.

[0073] Furthermore, since the oil cooler 50 is positioned upstream of the low-pressure compressor body 21 in the cooling water flow path 6, the low-pressure compressor body 21 can be cooled using the cooling water cooled by the oil cooler 50. Therefore, compared to the case where the low-pressure compressor body 21 is not cooled with cooling water (for example, the low-pressure compressor body 21 (the housing of the low-pressure compressor) is cooled with air), the temperature of the compressed air ejected from the low-pressure compressor body 21 can be reduced.

[0074] Furthermore, since the high-pressure stage compressor body 22 and the low-pressure stage compressor body 21 are connected in series in the cooling water flow path 6, the situation is different from that of the high-pressure stage compressor body 22 and the low-pressure stage compressor body 21 being connected in parallel (see below). Figure 5 , Figure 6 Compared to the previous method, since the cooling water flow path 6 is not branched, the amount of cooling water required can be reduced.

[0075] Furthermore, since oil-free screw compressors require higher cooling performance compared to other oil-supply compressors, compressor 1, which has higher cooling performance as described above, can function effectively.

[0076] Reference Figures 3-5 The first to ninth modifications of the compressor 1 of the first embodiment will be described.

[0077] In the first to ninth variations, the arrangement of some components of the cooling water flow path 6 differs from that in the embodiments described above. Since the structure other than the cooling water flow path 6 is substantially the same, details are omitted. Figure 1 The corresponding overall structure diagram and description of compressor 1, for use with Figure 2 The schematic diagram of the corresponding cooling water flow path 6 is explained.

[0078] Reference Figure 3 In the first variation, the configuration of the aftercooler 41 and the after-auxiliary cooler 40 in the second cooling water flow path 6c differs from that in the above embodiment ( Figure 2 The configuration has been changed. Specifically, the aftercooler 40 is positioned upstream of the aftercooler 41 in the cooling water flow path 6. Furthermore, the intermediate auxiliary cooler 30 is different from the configuration described in the above embodiment (…). Figure 2 Similarly, it is positioned upstream of the intercooler 31 in the cooling water flow path 6.

[0079] Compared to the case where an intermediate auxiliary cooler 30 and an aftercooler 40 are respectively installed downstream of the intermediate cooler 31 and the aftercooler 41 in the cooling water flow path 6, the temperature difference between the cooling water and the compressed air that exchange heat with the intermediate cooler 31 and the aftercooler 41 can be reduced. Therefore, the risk of thermal fatigue of the intermediate cooler 31 and the aftercooler 41 can be reduced.

[0080] In the second variation, the configuration of the intercooler 31 and the inter-auxiliary cooler 30 in the first cooling water flow path 6b differs from that in the above embodiment ( Figure 2 The configuration has been changed. Specifically, the intercooler 30 is positioned downstream of the intercooler 31 in the cooling water flow path 6. Furthermore, the post-auxiliary cooler 40 is different from the configuration described in the above embodiment. Figure 2 Similarly, it is located downstream of the aftercooler 41 in the cooling water flow path 6.

[0081] Reference Figure 4 In the third variation, from the first variation ( Figure 3 The design is changed to include, in the third cooling water flow path 6d, 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 configured in parallel.

[0082] In the fourth variation, the second variation is changed to include, in the third cooling water flow path 6d, 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 configured in parallel.

[0083] In the fifth modification, the configuration 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 different from that in the first modification. Figure 3The positions have been changed. Therefore, the high-pressure stage cooling jacket 22c of the high-pressure stage compressor body 22 is positioned upstream of the low-pressure stage cooling jacket 21c of the low-pressure stage compressor body 21.

[0084] In the sixth modification, the configuration 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 changed from that in the second modification.

[0085] Reference Figure 5 In the seventh modification, unlike the second modification, the first cooling water flow path 6b and the second cooling water flow path 6c merge at the outlets of the intercooler 31 and the aftercooler 41. In the merged first cooling water flow path 6b and second cooling water flow path 6c, the intercooler 30 is positioned upstream of the aftercooler 40. Alternatively, the intercooler 30 and the aftercooler 40 can be the same cooler.

[0086] In the 8th variation, from the 7th variation ( Figure 5 The design is changed to include, in the third cooling water flow path 6d, 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 configured in parallel.

[0087] In the ninth modification, the configuration 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 modification. That is, the high-pressure stage cooling jacket 22c of the high-pressure stage compressor body 22 is positioned upstream of the low-pressure stage cooling jacket 21c of the low-pressure stage compressor body 21.

[0088] (Second Implementation)

[0089] Figure 6 , Figure 7 The compressor 1 of the second embodiment shown omits (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, which are omitted from the first embodiment. Except for the parts related to this, it is substantially the same as the first embodiment. Therefore, there are omissions in the description of the parts shown in the first embodiment.

[0090] 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 in the third cooling water flow path 6d. Therefore, only the oil cooler 50 is provided 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 discharged from the outlet 6e.

[0091] Hereinafter, the first to third modifications of the compressor 1 of the second embodiment will be described.

[0092] In the first to third variations, the arrangement of some components of the cooling water flow path 6 differs from that in the second embodiment. Since the structure other than the cooling water flow path 6 is substantially the same, details are omitted. Figure 6 The corresponding overall structure diagram and description of compressor 1, for use with Figure 7 The schematic diagram of the corresponding cooling water flow path 6 is explained.

[0093] In the first variation, the configuration of the aftercooler 41 and the after-auxiliary cooler 40 in the second cooling water flow path 6c differs from that in the above embodiment ( Figure 7 The configuration has been changed. Specifically, the aftercooler 40 is positioned upstream of the aftercooler 41 in the cooling water flow path 6. Furthermore, the intermediate auxiliary cooler 30 is interchanged with that in the second embodiment (…). Figure 7 Similarly, it is positioned upstream of the intercooler 31 in the cooling water flow path 6.

[0094] In the second variation, the configuration of the intercooler 31 and the inter-auxiliary cooler 30 in the first cooling water flow path 6b differs from that in the above embodiment ( Figure 7 The intermediate auxiliary cooler 30 has been swapped. Specifically, the intermediate auxiliary cooler 30 is positioned downstream of the intermediate cooler 31 in the cooling water flow path 6. Furthermore, the post-auxiliary cooler 40 is interchanged with that in the second embodiment (…). Figure 7 Similarly, it is located downstream of the aftercooler 41 in the cooling water flow path 6.

[0095] In the third modification, the first cooling water flow path 6b and the second cooling water flow path 6c merge at the outlet of the intercooler 31 and the aftercooler 41, respectively. In the merged first cooling water flow path 6b and second cooling water flow path 6c, the intercooler 30 is positioned upstream of the aftercooler 40. Alternatively, the intercooler 30 and the aftercooler 40 may be the same cooler.

[0096] (Third Implementation)

[0097] Figure 8 , Figure 9 The compressor 1 of the third embodiment shown omits the intermediate auxiliary cooler 30 and the post-auxiliary cooler 40 from the first embodiment. Except for these related parts, it is substantially the same as the first embodiment. Therefore, there are omissions in the description of the parts shown in the first embodiment.

[0098] In this embodiment, the intermediate auxiliary cooler 30 is omitted in the first cooling water flow path 6b, and the post-auxiliary cooler 40 is omitted in the second cooling water flow path 6c. Therefore, only the intermediate cooler 31 is provided in the first cooling water flow path 6b, and only the post-cooler 41 is provided in the second cooling water flow path 6c.

[0099] In the first cooling water flow path 6b, cooling water from the water supply source 6a is heated by the intercooler 31 and discharged from the outlet 6e. In the second cooling water flow path 6c, cooling water from the water supply source 6a is heated by the aftercooler 41 and discharged from the outlet 6e.

[0100] (Fourth implementation)

[0101] Figure 10 , Figure 11 The compressor 1 of the fourth embodiment shown omits 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 intermediate auxiliary cooler 30, and the after-auxiliary cooler 40 from the first embodiment. Except for these related parts, it is substantially the same as the first embodiment. Therefore, there are omissions in the description of the parts shown in the first embodiment.

[0102] In this embodiment, the intermediate auxiliary cooler 30 is omitted in the first cooling water flow path 6b, the aftercooler 40 is omitted in 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 in the third cooling water flow path 6d. Therefore, only the intermediate cooler 31 is provided in the first cooling water flow path 6b, only the aftercooler 41 is provided in the second cooling water flow path 6c, and only the oil cooler 50 is provided in the third cooling water flow path 6d.

[0103] In the first cooling water flow path 6b, cooling water from the water supply source 6a is heated by the intercooler 31 and discharged from the outlet 6e. In the second cooling water flow path 6c, cooling water from the water supply source 6a is heated by the aftercooler 41 and discharged from the outlet 6e. In the third cooling water flow path 6d, cooling water from the water supply source 6a is heated by the oil cooler 50 and discharged from the outlet 6e.

[0104] The specific embodiments and variations of the present invention have been described above, but the present invention is not limited to the above-described forms and can be implemented in various ways within the scope of the present invention.

[0105] Reference Figure 12The intermediate auxiliary cooler 30 and the post-auxiliary cooler 40 can also be double-tube heat exchangers. Specifically, the intermediate auxiliary cooler 30 can also include an inner tube 30a through which compressed air passes and an outer tube 30b through which cooling water passes. Similarly, the post-auxiliary cooler 40 can also include an inner tube 40a through which compressed air passes and an outer tube 40b through which cooling water passes. Thus, compared to the case where the intermediate auxiliary cooler 30 and the post-auxiliary cooler 40 are separate heat exchangers, the number of parts is reduced and higher heat exchange performance can be achieved.

[0106] This disclosure may include the following methods.

[0107] (Method 1)

[0108] A compressor includes: a low-pressure compressor body for drawing in and compressing air; a water-cooled intercooler for cooling the compressed air ejected from the low-pressure compressor body; a high-pressure compressor body for compressing the compressed air cooled by the intercooler; a water-cooled aftercooler for cooling the compressed air ejected from the high-pressure compressor body; a water-cooled oil cooler for cooling oil supplied to the low-pressure compressor body and the high-pressure compressor body; and a cooling water flow path for cooling water to flow through; wherein 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.

[0109] (Method 2)

[0110] The compressor described in Method 1, wherein the aforementioned intercooler and the aforementioned aftercooler are plate heat exchangers.

[0111] (Method 3)

[0112] The compressor as described in method 1 or 2 further comprises: a water-cooled intermediate auxiliary cooler that cools the compressed air ejected from the low-pressure stage compressor body before the aforementioned intermediate cooler; and a water-cooled post-auxiliary cooler that cools the compressed air ejected from the high-pressure stage compressor body before the aforementioned post-cooler.

[0113] (Method 4)

[0114] As described in Method 3, the aforementioned intermediate auxiliary cooler is disposed upstream of the aforementioned intermediate cooler in the aforementioned cooling water flow path; the aforementioned post auxiliary cooler is disposed upstream of the aforementioned post cooler in the aforementioned cooling water flow path.

[0115] (Method 5)

[0116] In the compressor described in method 3 or 4, the aforementioned intermediate auxiliary cooler and the aforementioned post-auxiliary cooler are plate heat exchangers.

[0117] (Method 6)

[0118] The compressor of any one of methods 3 to 5, wherein the aforementioned intermediate auxiliary cooler includes an inner pipe through which the aforementioned compressed air passes and an outer pipe through which the aforementioned cooling water passes; and the aforementioned post auxiliary cooler includes an inner pipe through which the aforementioned compressed air passes and an outer pipe through which the aforementioned cooling water passes.

[0119] (Method 7)

[0120] In any one of the compressors described in methods 1 to 6, the aforementioned oil cooler is disposed upstream of the aforementioned low-pressure stage compressor body in the aforementioned cooling water flow path.

[0121] (Method 8)

[0122] As in any one of the compressors described in methods 1 to 7, the aforementioned high-pressure stage compressor body is disposed downstream of the aforementioned low-pressure stage compressor body in the aforementioned cooling water flow path.

[0123] (Method 9)

[0124] The compressor described in any one of methods 1 to 8, wherein the aforementioned low-pressure stage compressor body and the aforementioned high-pressure stage compressor body are oil-free screw compressors.

[0125] Explanation of reference numerals in the attached figures

[0126] 1 compressor

[0127] 5 airflow path

[0128] 5a supply destination

[0129] 6 cooling water path

[0130] 6a water supply source

[0131] 6b First Cooling Water Flow Path

[0132] 6c Second Cooling Water Flow Path

[0133] 6d Third Cooling Water Flow Path

[0134] 6e discharge outlet

[0135] 7 oil flow path

[0136] 10 Intake Filters

[0137] 11 Intake regulating valve

[0138] 20 Compressor body

[0139] 21 Low-pressure stage compressor body

[0140] 21a Low-pressure stage intake port

[0141] 21b High-pressure stage nozzle

[0142] 21c low-pressure stage cooling jacket

[0143] 22 High-pressure stage compressor body

[0144] 22a High-Pressure Grade Inlet

[0145] 22b high-pressure stage nozzle

[0146] 22C High-Pressure Cooling Jacket

[0147] 23 motors

[0148] 24 connecting boxes

[0149] 24a Oil Storage Section

[0150] 30 Intermediate Auxiliary Cooler

[0151] 30a inner tube

[0152] 30b outer tube

[0153] 31 Intercooler

[0154] 40-year-old auxiliary cooler

[0155] 40a inner tube

[0156] 40b outer tube

[0157] 41 Aftercooler

[0158] 50 oil cooler

[0159] 51 oil filter

[0160] 52 oil pump

Claims

1. A compressor, characterized in that, have: The low-pressure stage compressor body draws in and compresses air; The water-cooled intercooler cools the compressed air ejected from the aforementioned low-pressure stage compressor body. The high-pressure stage compressor body compresses the aforementioned compressed air that has been cooled by the aforementioned intercooler; A water-cooled aftercooler cools the compressed air ejected from the aforementioned high-pressure stage compressor body. The water-cooled oil cooler cools the oil supplied to the aforementioned low-pressure stage compressor body and the aforementioned high-pressure stage compressor body. as well as Cooling water flow path, for supplying cooling water flow; In the aforementioned cooling water flow path, the aforementioned intercooler, the aforementioned aftercooler, and the aforementioned oil cooler are configured in parallel, and the cooling water supplied to the aforementioned intercooler, the aforementioned aftercooler, and the aforementioned oil cooler does not interfere with each other.

2. The compressor as described in claim 1, characterized in that, The aforementioned intercooler and aftercooler are plate heat exchangers.

3. The compressor as described in claim 1, characterized in that, It also has: A water-cooled intercooler, compared to the aforementioned intercooler, first cools the compressed air ejected from the main body of the low-pressure compressor; and The water-cooled aftercooler cools the compressed air ejected from the main body of the high-pressure compressor before the aforementioned aftercooler.

4. The compressor as described in claim 3, characterized in that, The aforementioned intermediate auxiliary cooler is configured upstream of the aforementioned intermediate cooler in the aforementioned cooling water flow path; The aforementioned auxiliary cooler is configured upstream of the aforementioned aftercooler in the aforementioned cooling water flow path.

5. The compressor as described in claim 3, characterized in that, The aforementioned intermediate auxiliary cooler and the aforementioned post-auxiliary cooler are plate heat exchangers.

6. The compressor as described in claim 3, characterized in that, The aforementioned intermediate auxiliary cooler includes the aforementioned inner pipe through which compressed air passes and the aforementioned outer pipe through which cooling water passes; The aforementioned auxiliary cooler includes the aforementioned inner pipe through which compressed air passes and the aforementioned outer pipe through which cooling water passes.

7. The compressor as claimed in claim 1, characterized in that, The aforementioned oil cooler is configured in the aforementioned cooling water flow path upstream of the aforementioned low-pressure stage compressor body.

8. The compressor as claimed in claim 1, characterized in that, The aforementioned high-pressure stage compressor body is positioned downstream of the aforementioned low-pressure stage compressor body in the aforementioned cooling water flow path.

9. The compressor as described in any one of claims 1 to 8, characterized in that, The aforementioned low-pressure stage compressor body and the aforementioned high-pressure stage compressor body are oil-free screw compressors.

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