JP2017180420A - Screw compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate connection between a first compressor body and an intercooler, and between the intercooler and a second compressor body, suppress piping vibration as much as possible, and make an installation projection area of a screw compressor small.SOLUTION: A screw compressor 1 includes a first compressor body 11 subjected to inverter drive by a first motor 12, a second compressor body 21 subjected to inverter drive by a second motor 22, and an intercooler 30 at an upper part of which the first compressor body 11 and the second compressor body 21 are mounted. An introduction port 34 of the intercooler 30 is arranged right under an exhaust port 16 of the first compressor body 11, and a lead-out port 36 of the intercooler 30 is arranged right under a suction port 24 of the second compressor body 21.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a screw compressor.

  Patent Document 1 includes a first compressor body, an intercooler that cools the compressed air discharged from the first compressor body, and a second compressor body that further compresses the compressed air cooled by the intercooler. A screw compressor is disclosed.

JP 2010-275939 A

  In the screw compressor disclosed in Patent Document 1, the compressed air discharged from the first compressor body is guided to the intermediate stage discharge pipe, and the compressed air guided to the intermediate stage discharge pipe is cooled by the intercooler. Is done. Then, the compressed air cooled by the intercooler and guided to another intermediate-stage discharge pipe is sucked into the second compressor body. The first compressor main body and the intercooler, and the intercooler and the second compressor main body are connected via an intermediate-stage discharge pipe and another intermediate-stage discharge pipe, respectively.

  In the screw compressor of patent document 1, the 1st compressor main body and the 2nd compressor main body are arrange | positioned in the position away with respect to the intercooler. For this reason, a complicated bent discharge pipe having a plurality of bend portions is required, and the piping work requires complicated alignment. Since the length of the discharge pipe is long, the discharge pipe is likely to vibrate, so that the discharge pipe becomes a noise generation source.

  In addition, since the first compressor body and the second compressor body are driven by a single motor via a bull gear, the motor becomes larger and the installation projection area of the screw compressor becomes larger.

  Therefore, the technical problem to be solved by the present invention is that the connection between the first compressor body and the intercooler, and the connection between the intercooler and the second compressor body are easy, and pipe vibration can be generated as much as possible. It is to reduce the installation projected area of the screw compressor.

  In order to solve the above technical problem, according to the present invention, the following screw compressor is provided.

That is, the screw compressor
A first compressor body driven by an inverter by a first motor;
A second compressor body driven by an inverter by a second motor;
An intercooler on which the first compressor body and the second compressor body are mounted;
An introduction port of the intercooler is disposed immediately below an exhaust port of the first compressor body;
The lead-out port of the intercooler is arranged directly below the intake port of the second compressor body.

  According to the above configuration, the alignment between the inlet port of the intercooler and the exhaust port of the first compressor body, and the position between the outlet port of the intercooler and the intake port of the second compressor body. Matching is easy and no complicated piping work is required. Since each pipe length between the intercooler and the first compressor main body and between the intercooler and the second compressor main body becomes as short as possible, vibration caused by the pipe can be suppressed. Since the first compressor body and the second compressor body are individually driven by the first motor and the second motor, respectively, the first motor and the second motor can be reduced in size, and the installation area of the screw compressor can be increased. Get smaller.

  The present invention can have the following features in addition to the above features.

The intercooler includes a cooler casing body, an upstream casing disposed upstream of the cooler casing body, a downstream casing disposed downstream of the cooler casing body, and upstream of a plurality of tubes. An upstream tube sheet, and a downstream tube sheet that fixes the downstream side of the plurality of tubes,
In the intercooler, there is a tube-shaped first flow path in which a coolant flows through the plurality of tubes, and a main body space formed so as to surround the first flow path. Two flow paths are formed. According to the said structure, since the 1st flow path through which a coolant flows is comprised from the some tube, the cleaning operation | work of a 1st flow path can be performed easily.

The intercooler includes a cooler casing body, an upstream casing disposed upstream of the cooler casing body, a downstream casing disposed downstream of the cooler casing body, and upstream of the plurality of tubes. An upstream tube sheet for fixing the side, and a downstream tube sheet for fixing the downstream side of the plurality of tubes,
The intercooler includes a nest-shaped first flow path in which compressed gas flows through the plurality of tubes, and a main body space formed so as to surround the first flow path. Two flow paths are formed. According to the said structure, since the 1st flow path through which compressed gas flows is comprised from the several straight tube, the cleaning operation | work of a 1st flow path can be performed easily.

  A drain discharge hole is formed at the bottom of the downstream casing or the downstream bottom of the cooler casing body. According to the said structure, it can prevent that a drain flows in into the 2nd compressor main body side, and the reliability of a screw compressor improves.

  An inverter for controlling the rotational speed of the first motor and an inverter for controlling the rotational speed of the second motor are disposed within the installation projection area of the intercooler and above the intercooler. According to the said structure, the space of an intercooler can be used effectively and the installation projection area of a screw compressor becomes small.

  A connection adapter having a flange portion attached to either the introduction port of the intercooler or the exhaust port of the first compressor body, and a cylindrical portion protruding in an orthogonal direction from the flange portion; and the cylindrical portion The introduction port of the intercooler is hermetically connected to the exhaust port of the first compressor body through a seal member that is engaged with the outer peripheral surface of the first compressor body in an airtight state. According to the said structure, although the high-temperature compressed gas flows into a intercooler from a 1st compressor main body, the cylindrical part of a connection adapter thermally expands, but it is cylindrical by the seal structure between a cylindrical part and a sealing member. Since the thermal expansion of the part is absorbed, the airtightness of the connection adapter can be maintained.

  A connection adapter having a flange portion attached to either the outlet port of the intercooler or the intake port of the second compressor body, and a cylindrical portion protruding in an orthogonal direction from the flange portion, and the cylindrical portion The outlet port of the intercooler is hermetically connected to the intake port of the second compressor body through a seal member that is engaged with the outer peripheral surface of the second compressor body in an airtight state. According to the said structure, although the high-temperature compressed gas flows into a 2nd compressor main body from an intercooler, the cylindrical part of a connection adapter thermally expands, but it is cylindrical by the seal structure between a cylindrical part and a sealing member. Since the thermal expansion of the part is absorbed, the airtightness of the connection adapter can be maintained.

  A connection adapter attached to one of the introduction port of the intercooler and the exhaust port of the first compressor body, and having a flange portion and a cylindrical portion protruding in the orthogonal direction from the flange portion, and the connection adapter A sealing member that is attached to one of the introduction port and the exhaust port that is not attached and engages the outer peripheral surface of the cylindrical portion in an airtight state, and the sealing member is attached By inserting the connection adapter in the orthogonal direction with respect to either the introduction port or the exhaust port, the introduction port is hermetically connected to the exhaust port. According to this configuration, the pipe connecting the intercooler introduction port and the exhaust port of the first compressor main body does not need to be adjusted in length at the site, so that the connection work is facilitated.

  A connection adapter attached to one of the outlet port of the intercooler and the intake port of the second compressor body, and having a flange portion and a cylindrical portion protruding from the flange portion in an orthogonal direction, and the connection adapter A sealing member that is attached to one of the lead-out port and the intake port that is not attached and engages the outer peripheral surface of the cylindrical portion in an airtight state, and the sealing member is attached By inserting the connection adapter in the orthogonal direction with respect to either the derivation port or the intake port, the derivation port is hermetically connected to the intake port. According to this configuration, the pipe connecting the intercooler outlet port and the intake port of the second compressor main body does not need to be adjusted in length at the site, so that the connection work is facilitated.

  The connection adapter is attached to either the introduction port of the intercooler or the exhaust port of the first compressor body so that the cylindrical portion can be displaced in the orthogonal direction with respect to the seal member. Yes. According to the said structure, even if a cylindrical part is extended to a protrusion direction by thermal expansion, generation | occurrence | production of useless stress between the members connected can be prevented.

  The connection adapter is attached to one of the outlet port of the intercooler and the intake port of the second compressor body so that the cylindrical portion can be displaced in the orthogonal direction with respect to the seal member. Yes. According to the said structure, even if a cylindrical part is extended to a protrusion direction by thermal expansion, generation | occurrence | production of useless stress between the members connected can be prevented.

  According to the present invention, complicated piping work is not required, vibration caused by piping can be suppressed, and the installation projected area of the screw compressor is reduced.

The perspective view which looked at the screw compressor which concerns on 1st Embodiment of this invention from the front. The perspective view which looked at the screw compressor shown in FIG. 1 from the back surface. The typical perspective view explaining the flow of the compressed gas in the screw compressor shown in FIG. The typical front view explaining the flow of the compressed gas in the screw compressor shown in FIG. The typical front view explaining the flow of the compressed gas in the screw compressor which concerns on 2nd Embodiment. The top view of the screw compressor shown in FIG. The typical front view explaining the flow of the compressed gas in the screw compressor which concerns on 3rd Embodiment. The top view of the screw compressor shown in FIG. The typical front view explaining the flow of the compressed gas in the screw compressor which concerns on 4th Embodiment. The top view of the screw compressor shown in FIG. The schematic diagram explaining the connection structure via a connection adapter based on 5th Embodiment. The schematic diagram explaining the connection structure via a connection adapter based on 6th Embodiment.

(First embodiment)
First, the screw compressor 1 which concerns on 1st Embodiment of this invention is demonstrated, referring FIGS. 1-4. Note that the terms “upstream” and “downstream” in this application are based on the compressed gas flow direction 61, respectively.

  FIG.1 and FIG.2 is the perspective view which looked at the screw compressor 1 which concerns on 1st Embodiment from the front and the back, respectively. The screw compressor 1 is a two-stage oil-free screw compressor including a first compressor 10 having a low pressure stage and a second compressor 20 having a high pressure stage. In the screw compressor 1, the first compressor 10 and the second compressor 20 are placed on top of the intercooler 30. In the screw compressor 1, a gas (for example, air) to be compressed flows in the order of the first compressor 10, the intercooler 30, the second compressor 20, and an aftercooler (not shown).

  The first compressor 10 includes a first compressor body 11 and a first motor 12. In the first compressor body 11, a pair of screw rotors, each consisting of a male rotor and a female rotor that mesh with each other in an oil-free state, is housed in a rotor chamber formed in the rotor casing of the first compressor body 11. The screw rotor of the first compressor body 11 is inverter-driven by a first motor 12 directly connected to the rotor shaft of the first compressor body 11. The first motor 12 is mounted on the mounting plate 9 via a plurality of leg portions 18. An intake port 14 is disposed in the upper part of the first compressor body 11, and an exhaust port 16 is disposed in the lower part of the first compressor body 11. Specifically, the intake port 14 opens upward in the vertical direction, and the exhaust port 16 opens downward in the vertical direction. The first compressor body 11 compresses the gas to be compressed sucked from the intake port 14 and discharges the compressed gas through the exhaust port 16.

  The second compressor 20 includes a second compressor body 21 and a second motor 22. In the second compressor main body 21, a pair of screw rotors, each consisting of a male rotor and a female rotor that mesh with each other in an oil-free state, is housed in a rotor chamber formed in the rotor casing of the second compressor main body 21. The screw rotor of the second compressor body 21 is inverter-driven by a second motor 22 that is directly connected to the rotor shaft of the second compressor body 21. The second motor 22 is mounted on the mounting plate 9 via a plurality of leg portions 28. An intake port 24 is disposed in the lower part of the second compressor body 21, and an exhaust port 26 is disposed in the upper part of the second compressor body 21. Specifically, the intake port 24 opens downward in the vertical direction, and the exhaust port 26 opens upward in the vertical direction. The second compressor body 21 sucks compressed gas derived from the intercooler 30 from the intake port 24, further compresses the compressed gas, and discharges the compressed gas through the exhaust port 26. Note that the compressed gas discharged from the exhaust port 26 is cooled by an aftercooler.

  The intercooler 30 is a heat exchanger that is disposed on the downstream side of the first compressor 10 and cools the compressed gas whose temperature has been increased by being compressed by the first compressor 10. The aftercooler (not shown) is a heat exchanger that is disposed on the downstream side of the second compressor 20 and cools the compressed gas whose temperature has been increased by being compressed by the second compressor 20. A second compressor 20 is disposed on the downstream side of the intercooler 30.

  The intercooler 30 includes a cooler casing body 31, an upstream casing 32, and a downstream casing 33, and has a generally rectangular parallelepiped box shape. The cooler casing body 31 includes a first casing portion 31a and a second casing portion 31b that are partitioned by a partition wall (not shown). The first compressor 10 is placed on the first casing portion 31a, and the second compressor 20 is placed on the second casing portion 31b. The extending direction of the cooler casing body 31, that is, the extending direction of the first casing part 31a and the second casing part 31b is substantially parallel to the extending direction of the first compressor 10 and the second compressor 20, respectively. It is.

  The rotation axes of the first motor 12 and the second motor 22 are provided in parallel and side by side positions. Further, the rotation directions of the first motor 12 and the second motor 22 are reversed. Thereby, the 1st motor 12 and the 2nd motor 22 will rotate in the direction which cancels a vibration mutually.

  The upstream casing 32 is disposed upstream of the compressed gas flow direction 61 and is attached to the first compressor body 11 side of the first casing part 31a and the second motor 22 side of the second casing part 31b. It has been. The downstream casing 33 is disposed on the downstream side in the compressed gas flow direction 61 and is attached to the first motor 12 side of the first casing part 31a and the second compressor body 21 side of the second casing part 31b. ing. 3 and 4 schematically showing the screw compressor 1, the upstream casing 32 and the downstream casing 33 are not shown.

  The intercooler 30 is, for example, a shell and tube type. A first flow path 50 and a second flow path 51 are formed in the first casing portion 31a and the second casing portion 31b, respectively. The first flow path 50 includes a tube-shaped flow path in which a plurality of straight tubular tubes are installed in parallel. The first flow path 50 in the first casing portion 31a extends from the first motor 12 side to the first compressor body 11 side. The first flow path 50 in the second casing portion 31b extends from the second compressor body 21 side to the second motor 22 side.

  The second flow path 51 is a flow path including a main body space formed inside the casing of the cooler casing main body 31 so as to surround the first flow path 50. On the first motor 12 side and the second motor 22 side, a communication portion that connects the first casing portion 31a and the second casing portion 31b is formed. The second flow path 51 extends through the main body space 51 in the first casing portion 31a from the first compressor main body 11 side to the first motor 12 side, and is folded back at the communication portion to be in the second casing portion 31b. The main body space 51 extends from the second motor 22 side to the second compressor main body 21 side.

  As shown in FIGS. 3 and 4, an introduction port 34 and a lead-out port 36 are disposed on the upper surface of the cooler casing body 31. Specifically, the introduction port 34 and the outlet port 36 are open upward in the vertical direction. The introduction port 34 is disposed on the upstream side of the first casing portion 31 a and immediately below the exhaust port 16 of the first compressor body 11. The lead-out port 36 is disposed on the downstream side of the second casing portion 31 b and immediately below the intake port 24 of the second compressor body 21. The exhaust port 16 and the introduction port 34 are directly connected by bolting in a state where the connection end portions are in contact with each other. The intake port 24 and the outlet port 36 are also directly connected by bolting in a state in which the connection end portions are in contact with each other. Therefore, the exhaust port 16 and the introduction port 34 and the intake port 24 and the outlet port 36 are fluidly connected so that fluid flows in a sealed state, respectively. If it is a structure that uses complicated bent pipes or long pipes to connect, complicated piping work is required, but direct connection structures that bolt each other's connection ends require complicated piping work. And not.

  For example, a coolant (for example, water) flows through a plurality of straight tubular tubes that form the first flow path 50, and a compressed gas (for example, air) flows through the main body space 51 that forms the second flow path 51.

  In the first flow path 50 of the first casing portion 31a, the coolant flows from the first motor 12 side to the first compressor body 11 side. In the first flow path 50 of the second casing portion 31b, the coolant flows from the second compressor body 21 side to the second motor 22 side.

  The gas sucked from the intake port 14 is compressed by the first compressor body 11 and then discharged through the exhaust port 16. The compressed gas discharged from the exhaust port 16 is introduced into the first casing portion 31 a of the cooler casing body 31 through the introduction port 34. The compressed gas flows from the first compressor body 11 side to the first motor 12 side through the second flow path 51 in the first casing portion 31a. The compressed gas that has flowed toward the first motor 12 in the first casing portion 31a flows into the second motor 22 side of the second casing portion 31b through the communication portion. The compressed gas flows from the second motor 22 side to the second compressor body 21 side through the second flow path 51 in the second casing portion 31b. The compressed gas flowing through the second flow path 51 in the second casing portion 31 b is introduced into the second compressor body 21 through the outlet port 36 and the intake port 24. The compressed gas sucked from the intake port 24 is further compressed by the second compressor body 21 and then discharged through the exhaust port 26.

  As described above, the compressed gas flow direction 61 is configured to face the coolant flow direction 62 inside the cooler casing body 31, so that the compressed gas can be efficiently cooled.

  According to the first embodiment, alignment between the introduction port 34 of the intercooler 30 and the exhaust port 16 of the first compressor body 11, and the outlet port 36 of the intercooler 30 and the second compressor body. Positioning with the 21 intake ports 24 is easy, and complicated piping work is not required. Since each pipe length between the intercooler 30 and the first compressor body 11 and between the second compressor body 21 is as short as possible, vibration caused by the pipes can be suppressed. Since the first compressor main body 11 and the second compressor main body 21 are individually driven by the first motor 12 and the second motor 22, respectively, the first motor 12 and the second motor 22 can be miniaturized and screw compression is performed. The installation projected area of the machine 1 is reduced.

(Second Embodiment)
A second embodiment of the present invention will be described with reference to FIGS. In the second embodiment, components having the same functions as the components in the first embodiment are given the same reference numerals, and redundant descriptions are omitted.

  In the screw compressor 1 according to the second embodiment, the extending directions of the first compressor 10 and the second compressor 20 are substantially orthogonal to the extending direction of the cooler casing body 31.

  The rotation axes of the first motor 12 and the second motor 22 are provided in parallel and side by side positions. Further, the rotation directions of the first motor 12 and the second motor 22 are reversed. Thereby, the 1st motor 12 and the 2nd motor 22 will rotate in the direction which cancels a vibration mutually.

  The first compressor 10 and the second compressor 20 extend in a direction substantially orthogonal to the cooler casing body 31. The first motor 12 is mounted on the mounting plate 9 via a plurality of leg portions 18. An intake port 14 is disposed in the upper part of the first compressor body 11, and an exhaust port 16 is disposed in the lower part of the first compressor body 11. The second motor 22 is mounted on the mounting plate 9 via a plurality of leg portions 28. An intake port 24 is disposed in the lower part of the second compressor body 21, and an exhaust port 26 is disposed in the upper part of the second compressor body 21.

  On the upper surface of the cooler casing body 31, an introduction port 34 and a lead-out port 36 are disposed. The introduction port 34 is disposed on the upstream side of the cooler casing body 31 and immediately below the exhaust port 16 of the first compressor body 11. The outlet port 36 is disposed on the downstream side of the cooler casing body 31 and directly below the intake port 24 of the second compressor body 21. Between the exhaust port 16 and the introduction port 34 and between the intake port 24 and the outlet port 36 are fluidly connected so that fluid flows in a sealed state, respectively. A drain discharge hole 46 is formed at the bottom of the cooler casing body 31 on the downstream side. A drain valve 47 is attached to the pipe connected to the bottom portion on the downstream side of the cooler casing body 31 so as to communicate with the drain discharge hole 46. According to the said structure, it can prevent that a drain flows in into the 2nd compressor main body 21 side, and the reliability of the screw compressor 1 improves.

  The exhaust port 16 and the introduction port 34 are directly connected by bolting in a state where the connection end portions are in contact with each other. The intake port 24 and the outlet port 36 are also directly connected by bolting in a state in which the connection end portions are in contact with each other. The direct connection structure that bolts the connection ends of each other facilitates the connection between the first compressor body 11 and the intercooler 30, and between the intercooler 30 and the second compressor body 21, No complicated piping work is required.

  The upstream casing 32 is disposed on the upstream side in the flow direction 61 of the compressed gas, and is attached to the first compressor 10 side of the cooler casing body 31. The downstream casing 33 is disposed on the downstream side in the compressed gas flow direction 61 and is attached to the second compressor 20 side of the cooler casing body 31. The downstream casing 33 is provided with a coolant inlet 37, and the upstream casing 32 is provided with a coolant outlet 38.

  Inside the cooler casing body 31, a first flow path 50 including a nest-shaped flow path and a second flow path 51 extending in a crank shape are formed. The first flow path 50 includes a tube-shaped flow path in which a plurality of straight tubular tubes (hereinafter simply referred to as each tube) 42 are installed in parallel. The first flow path 50 in the cooler casing body 31 extends from the second compressor 20 side to the first compressor 10 side. At the upstream end and the downstream end of the cooler casing body 31, an upstream tube sheet 43 and a downstream tube sheet 44 extending in the longitudinal orthogonal direction are disposed, respectively. A plurality of baffle plates 41 extending in the direction orthogonal to the longitudinal direction are disposed inside the cooler casing body 31. The upstream tube plate 43, the downstream tube plate 44, and the plurality of baffle plates 41 are formed with a plurality of insertion holes corresponding to the tubes 42, and the tubes 42 are inserted into the insertion holes, respectively. Yes. The baffle plate 41 functions as a cooling fin that releases the heat of the tube 42.

  The main body space 51 is a space surrounded by the casing of the cooler casing main body 31, the upstream side tube plate 43, and the downstream side tube plate 44. Adjacent baffle plates 41 are spaced apart from each other in the longitudinal direction of the cooler casing body 31, and a gap between the adjacent baffle plates 41 forms a part of the second passage 51. The upper and lower portions of the baffle plate 41 are alternately cut out to constitute a part of the second passage 51. Therefore, the second flow path 51 is formed as a main body space 51 extending in a crank shape in the cooler casing main body 31.

  The coolant inlet 37 and the downstream end of the tube 42 may be connected by an end connection pipe (not shown). The coolant outlet 38 and the upstream end of the tube 42 may be connected by an end connection pipe (not shown). In this case, each of the downstream end connection pipe and the upstream end connection pipe constitutes a part of the first flow path 50.

  The upstream header space 52 surrounded by the upstream casing 32 and the upstream tube plate 43 may be hermetically sealed to fill the upstream header space 52 with a coolant. Alternatively, the downstream header space 53 surrounded by the downstream casing 33 and the downstream tube sheet 44 may be hermetically sealed to fill the downstream header space 53 with a coolant. In this case, the upstream header space 52 and the downstream header space 53 each constitute a part of the first flow path 50.

  In the above configuration, the coolant flows in the tubes 42 constituting the first flow path 50, and the compressed gas flows in the main body space 51 constituting the second flow path 51.

  The coolant flowing in from the coolant inlet 37 is introduced into the downstream end of each tube 42, flows through each tube 42, is led out from the upstream end of each tube 42, and is discharged from the coolant outlet 38. The

  The gas sucked from the intake port 14 is compressed by the first compressor body 11 and then discharged through the exhaust port 16. The compressed gas discharged from the exhaust port 16 is introduced into the cooler casing body 31 through the introduction port 34. The compressed gas flows through the crank-shaped body space 51 in the cooler casing body 31 from the first compressor body 11 side to the second compressor body 21 side. The compressed gas flowing on the second compressor main body 21 side of the main body space 51 is introduced into the second compressor main body 21 through the outlet port 36 and the intake port 24. The compressed gas sucked from the intake port 24 is further compressed by the second compressor body 21 and then discharged through the exhaust port 26.

  As described above, the compressed gas flow direction 61 is configured to face the coolant flow direction 62 inside the cooler casing body 31, so that the compressed gas can be efficiently cooled.

  According to the second embodiment, alignment between the introduction port 34 of the intercooler 30 and the exhaust port 16 of the first compressor body 11, and the outlet port 36 of the intercooler 30 and the second compressor body. Positioning with the 21 intake ports 24 is easy, and complicated piping work is not required. Since each pipe length between the intercooler 30 and the first compressor body 11 and between the second compressor body 21 is as short as possible, vibration caused by the pipes can be suppressed. Since the first compressor main body 11 and the second compressor main body 21 are individually driven by the first motor 12 and the second motor 22, respectively, the first motor 12 and the second motor 22 can be miniaturized and screw compression is performed. The installation projected area of the machine 1 is reduced.

(Third embodiment)
A third embodiment of the present invention will be described with reference to FIGS. In the third embodiment, components having the same functions as the components in the second embodiment are given the same reference numerals, and redundant descriptions are omitted.

  In the screw compressor 1 according to the third embodiment, the first compressor 10 and the second compressor 20 are respectively disposed on the upstream casing 32 and the downstream casing 33. Then, the compressed gas flows through each tube 42 constituting the first flow path 50, and the coolant flows within the main body space 51 constituting the second flow path 51.

  The first compressor 10 and the second compressor 20 extend in a direction substantially orthogonal to the cooler casing body 31.

  The rotation axes of the first motor 12 and the second motor 22 are provided in parallel and side by side positions. Further, the rotation directions of the first motor 12 and the second motor 22 are reversed. Thereby, the 1st motor 12 and the 2nd motor 22 will rotate in the direction which cancels a vibration mutually.

  A coolant inlet 37 and a coolant outlet 38 are disposed on the upper and lower surfaces of the cooler casing body 31, respectively. The coolant inlet 37 is disposed on the downstream side of the cooler casing body 31, and the coolant outlet 38 is disposed on the upstream side of the cooler casing body 31.

  A first flow path 50 and a second flow path 51 surrounding the first flow path 50 are formed inside the cooler casing body 31. The first flow path 50 includes a nest-shaped flow path in which the tubes 42 are installed in parallel. The first flow path 50 in the cooler casing body 31 extends from the first compressor 10 side to the second compressor 20 side. At the upstream end and the downstream end of the cooler casing body 31, an upstream tube sheet 43 and a downstream tube sheet 44 extending in the longitudinal orthogonal direction are disposed, respectively. A plurality of baffle plates 41 extending in the direction orthogonal to the longitudinal direction are disposed inside the cooler casing body 31. The upstream tube plate 43, the downstream tube plate 44, and the plurality of baffle plates 41 are formed with a plurality of insertion holes corresponding to the tubes 42, and the tubes 42 are inserted into the insertion holes, respectively. .

  The main body space 51 is a space surrounded by the casing of the cooler casing main body 31, the upstream side tube plate 43, and the downstream side tube plate 44. Adjacent baffle plates 41 are spaced apart from each other in the longitudinal direction of the cooler casing body 31, and a gap between the adjacent baffle plates 41 forms a part of the second passage 51. The upper and lower portions of the baffle plate 41 are alternately cut out to constitute a part of the second passage 51. Accordingly, the second flow path 51 is formed as a main body space 51 extending in a crank shape in the cooler casing main body 31. The main body space 51 surrounded by the casing of the cooler casing main body 31, the upstream side tube plate 43, and the downstream side tube plate 44 is in a hermetically sealed state, and the inside of the main body space 51 is filled with the coolant. .

  The upstream casing 32 is attached to the upstream side of the cooler casing body 31. The downstream casing 33 is attached to the downstream side of the cooler casing body 31. A drain discharge hole 46 is formed at the bottom of the downstream casing 33. A drain valve 47 is attached to the pipe connected to the bottom of the downstream casing 33 so as to communicate with the drain discharge hole 46. According to the said structure, it can prevent that a drain flows in into the 2nd compressor main body 21 side, and the reliability of the screw compressor 1 improves. The introduction port 34 is disposed on the upper surface of the upstream casing 32 and immediately below the exhaust port 16 of the first compressor body 11. The outlet port 36 is disposed on the upper surface of the downstream casing 33 and immediately below the intake port 24 of the second compressor body 21. Between the exhaust port 16 and the introduction port 34 and between the intake port 24 and the outlet port 36 are fluidly connected so that fluid flows in a sealed state, respectively.

  The exhaust port 16 and the introduction port 34 are directly connected by bolting in a state where the connection end portions are in contact with each other. The intake port 24 and the outlet port 36 are also directly connected by bolting in a state in which the connection end portions are in contact with each other. The direct connection structure that bolts the connection ends of each other facilitates the connection between the first compressor body 11 and the intercooler 30, and between the intercooler 30 and the second compressor body 21, No complicated piping work is required.

  The introduction port 34 and the upstream end of the tube 42 may be connected by an upstream end connection pipe (not shown). Further, the outlet port 36 and the downstream end of the tube 42 may be connected by a downstream end connecting pipe (not shown). In this case, each of the upstream end connecting pipe and the downstream end connecting pipe constitutes a part of the first flow path 50.

  The upstream header space 52 surrounded by the upstream casing 32 and the upstream tube plate 43 may be hermetically sealed to fill the upstream header space 52 with compressed gas. Alternatively, the downstream header space 53 surrounded by the downstream casing 33 and the downstream tube plate 44 may be hermetically sealed to fill the downstream header space 53 with compressed gas. In this case, the upstream header space 52 and the downstream header space 53 each constitute a part of the first flow path 50.

  In the above configuration, the compressed gas flows through the tubes 42 constituting the first flow path 50, and the coolant flows within the main body space 51 constituting the second flow path 51.

  The coolant flowing in from the coolant inlet 37 flows in the main body space 51 extending in a crank shape and is discharged from the coolant outlet 38.

  The gas sucked from the intake port 14 is compressed by the first compressor body 11 and then discharged through the exhaust port 16. The compressed gas discharged from the exhaust port 16 is introduced into the upstream header space 52 through the introduction port 34 and then introduced into the upstream end portion of the tube 42, or the upstream end connection pipe is connected. To the upstream end of the tube 42. The compressed gas flows through each tube 42 and is led out from the downstream end of each tube 42. The compressed gas derived from the downstream end portion of each tube 42 is derived into the downstream header space 53 or after being derived via the downstream end connection pipe, and then the exhaust port 36 and the intake air. It is introduced into the second compressor body 21 through the port 24. The compressed gas sucked from the intake port 24 is further compressed by the second compressor body 21 and then discharged through the exhaust port 26.

  As described above, the compressed gas flow direction 61 is configured to face the coolant flow direction 62 inside the cooler casing body 31, so that the compressed gas can be efficiently cooled.

  According to the third embodiment, alignment between the inlet port 34 of the upstream casing 32 and the exhaust port 16 of the first compressor body 11, and the outlet port 36 of the downstream casing 33 and the second compression are performed. Positioning with the intake port 24 of the machine body 21 is easy, and complicated piping work is not required. Since the length of each pipe between the upstream casing 32 and the first compressor body 11 and between the downstream casing 33 and the second compressor body 21 is as short as possible, vibration caused by the pipe is suppressed. it can. Since the first compressor main body 11 and the second compressor main body 21 are individually driven by the first motor 12 and the second motor 22, respectively, the first motor 12 and the second motor 22 can be miniaturized and screw compression is performed. The installation projected area of the machine 1 is reduced.

(Fourth embodiment)
A fourth embodiment of the present invention will be described with reference to FIGS. In the fourth embodiment, components having the same functions as the components in the third embodiment are given the same reference numerals, and redundant descriptions are omitted.

  In the screw compressor 1 according to the fourth embodiment, the first inverter 65 and the second inverter 66 are disposed above the cooler casing body 31.

  The first inverter 65 and the second inverter 66 are disposed within the installation projection area of the cooler casing body 31 and are disposed on the upper surface of the cooler casing body 31. Each of the first inverter 65 and the second inverter 66 includes, for example, a rectifier circuit, a smoothing circuit, an inverter circuit, and a gate drive circuit, and is connected to an AC power supply. The rotational speeds of the first motor 12 and the second motor 22 are controlled via a first inverter 65 and a second inverter 66 by a control unit (not shown).

  According to the said structure, the space of the intercooler 30 can be used effectively and the installation projection area of the screw compressor 1 becomes small.

(Fifth embodiment)
A fifth embodiment of the present invention will be described with reference to FIG. In the fifth embodiment, components having the same functions as the components in the first embodiment and the second embodiment are denoted by the same reference numerals, and redundant description is omitted.

  In the screw compressor 1 according to the fifth embodiment, the exhaust port 16 of the first compressor body 11 and the intake port 24 of the second compressor body 21 are introduced into the cooler casing body 31 via the connection adapter 70, respectively. The port 34 and the outlet port 36 are hermetically connected. In the present invention, the airtight connection means a connection state in which the airtightness at the connection site is maintained so that the compressed gas does not leak to the outside.

  The first compressor body 11 has a flange-like connection end 19, and an exhaust port 16 is formed at the connection end 19. The second compressor body 21 has a flange-like connection end 29, and an intake port 24 is formed in the connection end 29.

  The connection adapter 70 includes a flange portion 71 and a cylindrical portion 72 that protrudes from the flange portion 71 in the orthogonal direction. The flange portion 71 and the connection end portion 19 (29) are fastened by a fixing bolt 77. An annular groove 75 is formed in the flange-shaped connection end 39 of the cooler casing body 31. An O-ring 76 as a seal member is attached to the annular groove 75. The cylindrical portion 72 of the connection adapter 70 is inserted into the introduction port 34 (lead-out port 36) of the connection end 39 to which the O-ring 76 is attached. The connection adapter 70 is connected to either the introduction port 34 (lead-out port 36) or the exhaust port 16 (intake port 24) of the connection end 39 so that the cylindrical portion 72 can be displaced in a direction orthogonal to the O-ring 76. It is attached. When the outer peripheral surface 73 of the cylindrical portion 72 is engaged with the O-ring 76 in an airtight state, the exhaust port 16 (intake port 24) is hermetically connected to the introduction port 34 (outlet port 36) via the connection adapter 70. Is done.

  According to this connection configuration, it is not necessary to adjust the length of the pipes connecting the exhaust port 16 and the introduction port 34 or the intake port 24 and the outlet port 36, so that the connection work is easy. become.

  When a high-temperature compressed gas flows between the first compressor body 11, the intercooler 30, and the second compressor body 21, the tubular portion 72 of the connection adapter 70 is thermally expanded, and the tubular portion 72 is protruded in the protruding direction. Elongate. Since the thermal expansion of the cylindrical portion 72 is absorbed by the seal structure between the cylindrical portion 72 and the O-ring 76, it is possible to prevent generation of unnecessary stress between the connected members, and the airtightness of the connection adapter 70. Can be maintained. Note that the protruding length of the cylindrical portion 72 is the minimum necessary for providing airtightness by the outer peripheral surface 73 of the cylindrical portion 72 engaging with the O-ring 76 attached to the connection end 39. It is configured to have a length. Therefore, the protruding length of the cylindrical portion 72 is very short compared to the complicated bent discharge pipe having a plurality of bend portions as described in the prior art, and the vibration of the connection adapter 70 is reduced. It is suppressed.

  An O-ring 76 is attached to an annular groove 75 formed in the connection end 19 (29), and the cylindrical portion 72 of the connection adapter 70 fixed to the connection end 39 is connected to the connection end 19. It can also be configured to be inserted into the exhaust port 16 (intake port 24) of (29).

(Sixth embodiment)
A sixth embodiment of the present invention will be described with reference to FIG. In the sixth embodiment, components having the same functions as those of the third embodiment, the fourth embodiment, and the fifth embodiment are denoted by the same reference numerals, and redundant description is omitted.

  In the screw compressor 1 according to the sixth embodiment, the exhaust port 16 of the first compressor body 11 and the intake port 24 of the second compressor body 21 are introduced into the upstream casing 32 via the connection adapter 70. The port 34 and the outlet port 36 of the downstream casing 33 are hermetically connected.

  An annular groove 75 is formed in the flange-shaped connection end 39 of the upstream casing 32 and the downstream casing 33. An O-ring 76 as a seal member is attached to the annular groove 75. The cylindrical portion 72 of the connection adapter 70 is inserted into the introduction port 34 (lead-out port 36) of the connection end 39 to which the O-ring 76 is attached. As a result, the exhaust port 16 (intake port 24) is hermetically connected to the introduction port 34 (outlet port 36) via the connection adapter 70.

  An O-ring 76 is attached to an annular groove 75 formed in the connection end 19 (29), and the cylindrical portion 72 of the connection adapter 70 fixed to the connection end 39 is connected to the connection end 19. It can also be configured to be inserted into the exhaust port 16 (intake port 24) of (29).

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made as long as they are described in the claims.

  The present invention can also be applied to an oil-cooled screw compressor 1 in which cooling oil is introduced into each rotor chamber of each rotor casing of the first compressor body 11 and the second compressor body 21. Further, as the screw compressor 1, a two-stage type including the first compressor 10 of the low pressure stage and the second compressor 20 of the high pressure stage is exemplified, but the present invention is also applicable to a multistage type having three or more stages. Can be applied. That is, according to the present invention, the intercooler 30 is interposed between the compressor of a certain stage and the compressor of the next stage, and the compressed gas discharged from the compressor of the certain stage is cooled by the intercooler 30. After that, the present invention is also applied to the configuration supplied to the next stage compressor.

1: Screw compressor 9: Mounting plate 10: First compressor 11: First compressor main body 12: First motor 14: Intake port 16: Exhaust port 18: Leg 19: Connection end 20: Second compression Machine 21: Second compressor body 22: Second motor 24: Intake port 26: Exhaust port 28: Leg 29: Connection end 30: Intercooler 31: Cooler casing body 31a: First casing part 31b: Second casing Portion 32: Upstream casing 33: Downstream casing 34: Introduction port
36: outlet port 37: coolant inlet port 38: coolant outlet 39: connection end 41: baffle plate 42: tube 43: upstream side tube plate 44: downstream side tube plate 46: drain discharge hole 47: drain valve 50: first 1 flow path 51: body space (second flow path)
52: Upstream header space 53: Downstream header space 61: Flow direction of compressed gas 62: Flow direction of coolant 65: First inverter 66: Second inverter 70: Connection adapter 71: Flange portion 72: Cylindrical portion 73 : Outer peripheral surface 75: groove 76: O-ring (seal member)
77: Fixing bolt 78: Screw hole

Claims (11)

A first compressor body driven by an inverter by a first motor;
A second compressor body driven by an inverter by a second motor;
An intercooler on which the first compressor body and the second compressor body are mounted;
An introduction port of the intercooler is disposed immediately below an exhaust port of the first compressor body;
A screw compressor, wherein a lead-out port of the intercooler is disposed immediately below an intake port of the second compressor body. The screw compressor according to claim 1,
The intercooler includes a cooler casing body, an upstream casing disposed upstream of the cooler casing body, a downstream casing disposed downstream of the cooler casing body, and upstream of a plurality of tubes. An upstream tube sheet, and a downstream tube sheet that fixes the downstream side of the plurality of tubes,
In the intercooler, there is a tube-shaped first flow path in which a coolant flows through the plurality of tubes, and a main body space formed so as to surround the first flow path. A screw compressor in which two flow paths are formed. The screw compressor according to claim 1,
The intercooler includes a cooler casing body, an upstream casing disposed upstream of the cooler casing body, a downstream casing disposed downstream of the cooler casing body, and upstream of a plurality of tubes. An upstream tube sheet, and a downstream tube sheet that fixes the downstream side of the plurality of tubes,
The intercooler includes a nest-shaped first flow path in which compressed gas flows through the plurality of tubes, and a main body space formed so as to surround the first flow path. A screw compressor in which two flow paths are formed. In the screw compressor according to claim 2 or 3,
A screw compressor in which a drain discharge hole is formed in a bottom portion of the downstream casing or a downstream bottom portion of the cooler casing body. The screw compressor according to any one of claims 1 to 4,
A screw in which an inverter for controlling the rotational speed of the first motor and an inverter for controlling the rotational speed of the second motor are disposed within the installation projection area of the intercooler and above the intercooler. Compressor. The screw compressor according to any one of claims 1 to 5,
A connection adapter having a flange portion attached to either the introduction port of the intercooler or the exhaust port of the first compressor body, and a cylindrical portion protruding in an orthogonal direction from the flange portion; and the cylindrical portion A screw compressor, wherein the introduction port of the intercooler is hermetically connected to the exhaust port of the first compressor body via a seal member that is engaged with the outer peripheral surface of the first compressor body in an airtight state. The screw compressor according to any one of claims 1 to 6,
A connection adapter having a flange portion attached to either the outlet port of the intercooler or the intake port of the second compressor body, and a cylindrical portion protruding in an orthogonal direction from the flange portion, and the cylindrical portion A screw compressor, wherein the outlet port of the intercooler is hermetically connected to the intake port of the second compressor body through a seal member that is engaged with the outer peripheral surface of the second compressor body in an airtight state. The screw compressor according to any one of claims 1 to 5,
A connection adapter attached to one of the introduction port of the intercooler and the exhaust port of the first compressor body, and having a flange portion and a cylindrical portion protruding in the orthogonal direction from the flange portion, and the connection adapter A sealing member that is attached to one of the introduction port and the exhaust port that is not attached and engages the outer peripheral surface of the cylindrical portion in an airtight state, and the sealing member is attached A screw compressor, wherein the connection port is hermetically connected to the exhaust port by inserting the connection adapter in the orthogonal direction with respect to either the introduction port or the exhaust port. The screw compressor according to any one of claims 1 to 6,
A connection adapter attached to one of the outlet port of the intercooler and the intake port of the second compressor body, and having a flange portion and a cylindrical portion protruding from the flange portion in an orthogonal direction, and the connection adapter A sealing member that is attached to one of the lead-out port and the intake port that is not attached and engages the outer peripheral surface of the cylindrical portion in an airtight state, and the sealing member is attached A screw compressor, wherein the connection adapter is inserted in the orthogonal direction with respect to one of the derivation port and the intake port, whereby the derivation port is hermetically connected to the intake port. The screw compressor according to claim 8,
The connection adapter is attached to either the introduction port of the intercooler or the exhaust port of the first compressor body so that the cylindrical portion can be displaced in the orthogonal direction with respect to the seal member. There is a screw compressor. The screw compressor according to claim 9,
The connection adapter is attached to one of the outlet port of the intercooler and the intake port of the second compressor body so that the cylindrical portion can be displaced in the orthogonal direction with respect to the seal member. There is a screw compressor.

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