EP4628730A1 - Screw compressor - Google Patents

Screw compressor

Info

Publication number
EP4628730A1
EP4628730A1 EP23897094.1A EP23897094A EP4628730A1 EP 4628730 A1 EP4628730 A1 EP 4628730A1 EP 23897094 A EP23897094 A EP 23897094A EP 4628730 A1 EP4628730 A1 EP 4628730A1
Authority
EP
European Patent Office
Prior art keywords
flow path
rotor
cooling flow
casing
delivery
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP23897094.1A
Other languages
German (de)
French (fr)
Inventor
Takeshi Tsuchiya
Kotaro Chiba
Toshiaki Yabe
Kohei Sakai
Shotaro Sano
Yuki Taniyama
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Industrial Equipment Systems Co Ltd
Original Assignee
Hitachi Industrial Equipment Systems Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hitachi Industrial Equipment Systems Co Ltd filed Critical Hitachi Industrial Equipment Systems Co Ltd
Publication of EP4628730A1 publication Critical patent/EP4628730A1/en
Pending legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
    • F04C18/08—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C18/12—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
    • F04C18/14—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons
    • F04C18/16—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with helical teeth, e.g. chevron-shaped, screw type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01C—ROTARY-PISTON OR OSCILLATING-PISTON MACHINES OR ENGINES
    • F01C21/00—Component parts, details or accessories not provided for in groups F01C1/00 - F01C20/00
    • F01C21/10—Outer members for co-operation with rotary pistons; Casings
    • F01C21/104—Stators; Members defining the outer boundaries of the working chamber
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
    • F04C29/04—Heating; Cooling; Heat insulation

Definitions

  • a screw compressor according to Patent Document 1 includes a male rotor that is disposed on one side in a horizontal direction, a female rotor that is disposed on an opposite side in the horizontal direction and rotates so as to mesh with the male rotor, intake-side bearings and delivery-side bearings that rotatably support the male rotor and the female rotor, a casing that accommodates the male rotor, the female rotor, the intake-side bearings, and the delivery-side bearings and forms a plurality of compression chambers in grooves of the male rotor and the female rotor, an intake flow path that establishes communication between an intake port (opening) formed in a lower surface of the casing and compression chambers in an intake process, and a delivery flow path that establishes communication between a delivery port (opening) formed in an upper surface of the casing and compression chambers in a delivery process.
  • the screw compressor according to Patent Document 1 further includes a casing cooling flow path (cooling jacket) which is formed in the casing and through which the cooling water flows.
  • the casing cooling flow path includes a delivery-side cooling flow path that is formed on an upper side of the casing and over an entire outer circumference of the delivery flow path, a male-rotor-side cooling flow path that is formed on the one side in the horizontal direction (in other words, on the male rotor side) of the casing and is connected to the delivery-side cooling flow path, a female-rotor-side cooling flow path that is formed on the opposite side in the horizontal direction (in other words, on the female rotor side) of the casing and is connected to the delivery-side cooling flow path, an intake-side cooling flow path that is formed on a lower side of the casing so as to be closer to the intake flow path relative to the delivery-side bearings and is connected between the male-rotor-side cooling flow path and the female-rotor-side cooling flow path, an inlet provided in the male-rotor-
  • the cooling water is supplied to the male-rotor-side cooling flow path via the inlet from the outside.
  • a part of the cooling water supplied to the male-rotor-side cooling flow path flows through an upper-side portion of the male-rotor-side cooling flow path, the delivery-side cooling flow path, and an upper-side portion of the female-rotor-side cooling flow path in this order and is then discharged to the outside via the outlet.
  • a part of the cooling water supplied to the male-rotor-side cooling flow path flows through a lower-side portion of the male-rotor-side cooling flow path, a bearing-side cooling flow path, and a lower-side portion of the female-rotor-side cooling flow path in this order and is then discharged to the outside via the outlet.
  • Patent Document 1 JP-H05-231362-A
  • the casing cooling flow path described in Patent Document 1 includes the delivery-side cooling flow path, the male-rotor-side cooling flow path, the female-rotor-side cooling flow path, and the intake-side cooling flow path, the delivery-side cooling flow path being formed over the entire outer circumference of the delivery flow path, and hence the delivery flow path can efficiently be cooled.
  • a flow rate and a flow velocity of the cooling liquid in the delivery-side cooling flow path are increased to increase cooling efficiency.
  • the present invention has been made in view of the matter described above and has an object to increase cooling efficiency.
  • the present invention includes a plurality of means for solving the problem described above.
  • One example thereof is a screw compressor, including a male rotor that is disposed on one side in a horizontal direction, a female rotor that is disposed on an opposite side in the horizontal direction and rotates so as to mesh with the male rotor, intake-side bearings and delivery-side bearings that rotatably support the male rotor and the female rotor, a casing that accommodates the male rotor, the female rotor, the intake-side bearings, and the delivery-side bearings and forms a plurality of compression chambers in grooves of the male rotor and the female rotor, an intake flow path that establishes communication between an intake port formed on one side in a vertical direction of the casing and compression chambers in an intake process, a delivery flow path that establishes communication between a delivery port formed on an opposite side in the vertical direction of the casing and compression chambers in
  • the cooling efficiency can be increased.
  • FIG. 1 is a vertical cross-sectional view for illustrating a structure of a screw compressor in the present embodiment.
  • FIG. 2 is a horizontal cross-sectional view for illustrating the structure of the screw compressor in the present embodiment. Note that, in FIG. 1 , a delivery-side cooling flow path and a bearing-side cooling flow path described later are illustrated and, in FIG. 2 , illustration of a male-rotor-side cooling flow path and a female-rotor-side cooling flow path described later is omitted.
  • the screw compressor according to the present embodiment includes a male rotor 1A that is disposed on one side (an upper side of FIG. 2 ) in a horizontal direction, a female rotor 1B that is disposed on an opposite side (a lower side of FIG. 2 ) in the horizontal direction and rotates so as to mesh with the male rotor 1A, a intake-side bearing 2A and delivery-side bearings 3A that rotatably support the male rotor 1A, a intake-side bearing 2B and delivery-side bearings 3B that rotatably support the female rotor 1B, and a casing 4 that accommodates the male rotor 1A, the female rotor 1B, the intake-side bearings 2A and 2B, and the delivery-side bearings 3A and 3B.
  • the male rotor 1A and the female rotor 1B are disposed such that an axial direction (a left-right direction of FIG. 1 and FIG. 2 ) thereof is in the horizontal direction.
  • a rotating machine in details, a motor or the like
  • a gear mechanism or a belt mechanism for example, a gear mechanism or a belt mechanism.
  • a timing gear (not illustrated) is provided to a shaft portion of the male rotor 1A on the other side (a right side of FIG. 1 and FIG. 2 ), a timing gear (not illustrated) is also provided to a shaft portion of the female rotor 1B, and these timing gears mesh with each other.
  • a rotational force of the male rotor 1A is transmitted to the female rotor 1B, and the female rotor 1B rotates in a state in which a lobe section of the male rotor 1A and a lobe section of the female rotor 1B are not in contact with each other.
  • Each compression chamber moves from the one side (the left side of FIG. 1 and FIG. 2 ) in the rotor shaft direction to the opposite side (the right side of FIG. 1 and FIG. 2 ) as the male rotor 1A and the female rotor 1B rotate, and changes in a volume.
  • each working chamber is configured to sequentially execute an intake process of taking in gas such as air, a compression process of compressing the gas, and a delivery process of delivering the compressed gas.
  • the main casing 5 includes an intake port (opening) 8 formed in a lower surface on one side in the vertical direction and a delivery port (opening) 9 formed in an upper surface on an opposite side in the vertical direction.
  • An intake flow path 10 which establishes communication between the intake port 8 and the compression chambers in the intake process is formed in the main casing 5 and the intake-side casing 6.
  • a delivery flow path 11 which establishes communication between the delivery port 9 and the compression chambers in the delivery process is formed in the main casing 5.
  • a casing cooling flow path 12 is formed in the main casing 5 such that cooling liquid such as water or oil flows through the casing cooling flow path 12.
  • FIG. 3 is a transparent perspective view of the main casing 5 for illustrating the overall structure of the casing cooling flow path 12 in the present embodiment. Note that, in FIG. 3 , an external shape of the main casing 5 is indicated by two-dot chain lines, and the male-rotor-side bore 7A, the female-rotor-side bore 7B, and the delivery flow path 11 are partially indicated by two-dot chain lines.
  • FIG. 4 is a horizontal cross-sectional view (a cross-sectional view as viewed from the upper side) of the main casing for illustrating the structure of the delivery-side cooling flow path in the present embodiment.
  • FIG. 3 is a transparent perspective view of the main casing 5 for illustrating the overall structure of the casing cooling flow path 12 in the present embodiment. Note that, in FIG. 3 , an external shape of the main casing 5 is indicated by two-dot chain lines, and the male-rotor-side bore 7A, the female-rotor-side bore 7B, and the delivery flow path 11 are partially indicated by
  • FIG. 5 is a vertical cross-sectional view (a cross-sectional view taken along a line V-V of FIG. 4 ) of the main casing for illustrating a structure of the male-rotor-side cooling flow path and the supply flow path in the present embodiment.
  • FIG. 6 is a vertical cross-sectional view (cross-sectional view taken along a line VI-VI of FIG. 4 ) of the main casing for illustrating a structure of the female-rotor-side cooling flow path in the present embodiment.
  • the casing cooling flow path 12 includes a delivery-side cooling flow path 13 that is formed on the upper side of the main casing 5 and over an entire outer circumference of the delivery flow path 11 (in other words, an entire circumference of a cross section vertical to a flow direction of the cooling liquid), a male-rotor-side cooling flow path 14 that is formed on the one side in the horizontal direction (in other words, on the male rotor side) of the main casing 5 and is connected to the delivery-side cooling flow path 13, a female-rotor-side cooling flow path 15 that is formed on the opposite side of the main casing 5 in the horizontal direction (in other words, on the female rotor side) and is connected to the delivery-side cooling flow path 13, and a bearing-side cooling flow path 16 (see FIG.
  • the casing cooling flow path 12 includes a vertical rib 17 that is provided on the one side (in other words, the male rotor side) in the horizontal direction of the main casing 5 and extends in the vertical direction, a supply flow path 18 that is separated from the male-rotor-side cooling flow path 14 by the vertical rib 17 and is connected to the delivery-side cooling flow path 13, an inlet 19 that is provided on the one side in the horizontal direction and on the lower side of the main casing 5 (in details, on a lower side of the supply flow path 18), and an outlet 20 that is provided on the opposite side in the horizontal direction and on the upper side of the main casing 5.
  • pipes 21A and 21B are connected, respectively.
  • Cooling water is supplied from the outside to the delivery-side cooling flow path 13 via the pipe 21A, the inlet 19, and the supply flow path 18 and flows through the delivery-side cooling flow path 13. A part of the cooling water which has flowed through the delivery-side cooling flow path 13 does not flow out to the male-rotor-side cooling flow path 14 and female-rotor-side cooling flow path 15 and is discharged to the outside via the outlet 20 and the pipe 21B.
  • the main casing 5 includes an intake port (opening) 8A formed in the upper surface on the one side in the vertical direction and a delivery port (opening) 9A formed in the lower surface on the opposite side in the vertical direction.
  • An intake flow path 10A which establishes communication between the intake port 8A and the compression chambers in the intake process is formed in the intake-side casing 6.
  • a delivery flow path 11A which establishes the communication between the delivery port 9A and the compression chambers in the delivery process is formed in the main casing 5.
  • the casing cooling flow path 12A includes the inlet 19 that is provided on the one side in the horizontal direction and on the lower side of the main casing 5, the outlet 20 that is provided on the opposite side in the horizontal direction and on the upper side of the main casing 5, and a vertical rib 24 that is provided so as to extend in the vertical direction of the female-rotor-side cooling flow path 15A and promotes outflow of the cooling liquid from the female-rotor-side cooling flow path 15A.
  • the cooling water is supplied from the outside to the delivery-side cooling flow path 13A via the pipe 21A and the inlet 19 and flows through the delivery-side cooling flow path 13A.
  • a part of the cooling water which has flowed through the delivery-side cooling flow path 13A flows into the male-rotor-side cooling flow path 14A, flows through the male-rotor-side cooling flow path 14A and the bearing-side cooling flow path 16A in this order, and is discharged to the outside via the outlet 20 and the pipe 21B.
  • a part of the cooling water which has flowed through the delivery-side cooling flow path 13A flows into the female-rotor-side cooling flow path 15A, flows through the female-rotor-side cooling flow path 15A, and is discharged to the outside via the outlet 20 and the pipe 21B.
  • the casing cooling flow path 12A includes a horizontal rib 22A provided to the male-rotor-side cooling flow path 14A so as to extend in the rotor shaft direction (the left-right direction of FIG. 11 ) and a horizontal rib 23A provided to the female-rotor-side cooling flow path 15A so as to extend in the rotor shaft direction (the left-right direction of FIG. 12 ). Positions of the horizontal ribs 22A and 23A in the vertical direction (the upper-lower direction of FIG. 11 and FIG. 12 ) are the same as the axial center of the male rotor 1A and the axial center of the female rotor 1B.
  • the horizontal rib 22A occupies, for example, 50% to 90% of a width of the male-rotor-side cooling flow path 14A in the rotor shaft direction, and hence suppresses the inflow of the cooling liquid from the delivery-side cooling flow path 13A to the male-rotor-side cooling flow path 14A.
  • the horizontal rib 23A occupies, for example, 50% to 90% of a width of the female-rotor-side cooling flow path 15A in the rotor shaft direction, and hence suppresses the inflow of the cooling liquid from the delivery-side cooling flow path 13A to the female-rotor-side cooling flow path 15A.
  • a flow rate of the cooling water in the male-rotor-side cooling flow path 14A, the female-rotor-side cooling flow path 15A, and the bearing-side cooling flow path 16A can be reduced, and a flow rate of the cooling water in the delivery-side cooling flow path 13A can be increased by the reduced amount.
  • the inlet 19 of the casing cooling flow path 12A is provided on the lower side of the casing 4, and the outlet 20 is provided on the upper side of the casing 4.
  • the inlet of the casing cooling flow path 12A is provided on the upper side of the casing 4 and the outlet is provided on the lower side of the casing 4, it is possible to suppress an occurrence of trapped air in the casing cooling flow path 12A.
  • the inlet 19 of the casing cooling flow path 12A is provided on the one side in the horizontal direction and on the lower side of the casing 4 and the outlet 20 is disposed on the opposite side in the horizontal direction and on the upper side of the casing 4 in the second embodiment, but the configuration is not limited to this example.
  • the outlet 20 of the casing cooling flow path 12A may be disposed on the upper side and between the axial center of the male rotor 1A and the axial center of the female rotor 1B in the horizontal direction of the casing 4 (see FIG. 7 described before).
  • the inlet 19 of the casing cooling flow path 12A may be provided on the opposite side in the horizontal direction and on the lower side of the casing 4, and the outlet 20 may be disposed on the one side in the horizontal direction and on the upper side of the casing 4, which is not illustrated.
  • the vertical rib 24 is provided to only the female-rotor-side cooling flow path 15A, but the configuration is not limited to this example.
  • the vertical rib 24 may be provided to only the male-rotor-side cooling flow path 14A, or may be provided to both of the male-rotor-side cooling flow path 14A and the female-rotor-side cooling flow path 15A.
  • the positions of the horizontal ribs 22A and 23A in the vertical direction are the same as the axial center of the male rotor 1A and the axial center of the female rotor 1B, but the configuration is not limited to this case.
  • the positions of the horizontal ribs 22A and 23A in the vertical direction may be on the delivery port 9 side (that is, the lower side) relative to the axial center of the male rotor 1A and the axial center of the female rotor 1B.
  • the screw compressor is configured such that the rotational force of the male rotor 1A is transmitted to the female rotor 1B through the meshing between the timing gears, but the configuration is not limited to this example, and there may be provided such a configuration that the rotational force of the male rotor 1A is transmitted to the female rotor 1B through, for example, meshing between the lobe section of the male rotor 1A and the lobe section of the female rotor 1B.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)

Abstract

Provided is a screw compressor capable of increasing cooling efficiency.
A casing cooling flow path 12 of the screw compressor includes a delivery-side cooling flow path 13 formed on an upper side of a casing 4 and over an entire outer circumference of a delivery flow path 11, a male-rotor-side cooling flow path 14 that is formed on one side in a horizontal direction of the casing 4 and into which a cooling liquid flows from the delivery-side cooling flow path 13, a female-rotor-side cooling flow path 15 that is formed on an opposite side in the horizontal direction of the casing 4 and into which the cooling liquid flows from the delivery-side cooling flow path 13, a horizontal rib 22 that is provided to the male-rotor-side cooling flow path 14 so as to extend in a rotor shaft direction and suppresses the inflow of the cooling liquid from the delivery-side cooling flow path 13 to the male-rotor-side cooling flow path 14, and a horizontal rib 23 that is provided to the female-rotor-side cooling flow path 15 so as to extend in the rotor shaft direction and suppresses the inflow of the cooling liquid from the delivery-side cooling flow path 13 to the female-rotor-side cooling flow path 15.

Description

    Technical Field
  • The present invention relates to a screw compressor that compresses gas.
    • Background Art
  • A screw compressor according to Patent Document 1 includes a male rotor that is disposed on one side in a horizontal direction, a female rotor that is disposed on an opposite side in the horizontal direction and rotates so as to mesh with the male rotor, intake-side bearings and delivery-side bearings that rotatably support the male rotor and the female rotor, a casing that accommodates the male rotor, the female rotor, the intake-side bearings, and the delivery-side bearings and forms a plurality of compression chambers in grooves of the male rotor and the female rotor, an intake flow path that establishes communication between an intake port (opening) formed in a lower surface of the casing and compression chambers in an intake process, and a delivery flow path that establishes communication between a delivery port (opening) formed in an upper surface of the casing and compression chambers in a delivery process.
  • The screw compressor according to Patent Document 1 further includes a casing cooling flow path (cooling jacket) which is formed in the casing and through which the cooling water flows. The casing cooling flow path includes a delivery-side cooling flow path that is formed on an upper side of the casing and over an entire outer circumference of the delivery flow path, a male-rotor-side cooling flow path that is formed on the one side in the horizontal direction (in other words, on the male rotor side) of the casing and is connected to the delivery-side cooling flow path, a female-rotor-side cooling flow path that is formed on the opposite side in the horizontal direction (in other words, on the female rotor side) of the casing and is connected to the delivery-side cooling flow path, an intake-side cooling flow path that is formed on a lower side of the casing so as to be closer to the intake flow path relative to the delivery-side bearings and is connected between the male-rotor-side cooling flow path and the female-rotor-side cooling flow path, an inlet provided in the male-rotor-side cooling flow path, and an outlet provided in the female-rotor-side cooling flow path. Positions of the inlet and the outlet in the vertical direction are the same as axial centers of the male rotor and the female rotor.
  • The cooling water is supplied to the male-rotor-side cooling flow path via the inlet from the outside. A part of the cooling water supplied to the male-rotor-side cooling flow path flows through an upper-side portion of the male-rotor-side cooling flow path, the delivery-side cooling flow path, and an upper-side portion of the female-rotor-side cooling flow path in this order and is then discharged to the outside via the outlet. A part of the cooling water supplied to the male-rotor-side cooling flow path flows through a lower-side portion of the male-rotor-side cooling flow path, a bearing-side cooling flow path, and a lower-side portion of the female-rotor-side cooling flow path in this order and is then discharged to the outside via the outlet.
    • Prior Art Document Patent Document
  • Patent Document 1: JP-H05-231362-A
    • Summary of the Invention Problem to be Solved by the Invention
  • In the screw compressor, due to generation of compression heat, a temperature in a portion around the delivery flow path is relatively high. The casing cooling flow path described in Patent Document 1 includes the delivery-side cooling flow path, the male-rotor-side cooling flow path, the female-rotor-side cooling flow path, and the intake-side cooling flow path, the delivery-side cooling flow path being formed over the entire outer circumference of the delivery flow path, and hence the delivery flow path can efficiently be cooled. However, there is room for improvement in such a point that a flow rate and a flow velocity of the cooling liquid in the delivery-side cooling flow path are increased to increase cooling efficiency.
  • The present invention has been made in view of the matter described above and has an object to increase cooling efficiency.
    • Means for Solving the Problem
  • In order to solve the problem described above, a configuration described in the scope of claims is applied. The present invention includes a plurality of means for solving the problem described above. One example thereof is a screw compressor, including a male rotor that is disposed on one side in a horizontal direction, a female rotor that is disposed on an opposite side in the horizontal direction and rotates so as to mesh with the male rotor, intake-side bearings and delivery-side bearings that rotatably support the male rotor and the female rotor, a casing that accommodates the male rotor, the female rotor, the intake-side bearings, and the delivery-side bearings and forms a plurality of compression chambers in grooves of the male rotor and the female rotor, an intake flow path that establishes communication between an intake port formed on one side in a vertical direction of the casing and compression chambers in an intake process, a delivery flow path that establishes communication between a delivery port formed on an opposite side in the vertical direction of the casing and compression chambers in a delivery process, and a casing cooling flow path that is formed in the casing and through which cooling liquid flows, and the casing cooling flow path includes a delivery-side cooling flow path that is formed on the opposite side in the vertical direction of the casing and over an entire outer circumference of the delivery flow path, a male-rotor-side cooling flow path that is formed on the one side in the horizontal direction of the casing and into which the cooling liquid flows from the delivery-side cooling flow path, a female-rotor-side cooling flow path that is formed on the opposite side in the horizontal direction of the casing and into which the cooling liquid flows from the delivery-side cooling flow path, a first horizontal rib that is provided to the male-rotor-side cooling flow path so as to extend in a rotor shaft direction and suppresses the inflow of the cooling liquid from the delivery-side cooling flow path to the male-rotor-side cooling flow path, and a second horizontal rib that is provided to the female-rotor-side cooling flow path so as to extend in the rotor shaft direction and suppresses the inflow of the cooling liquid from the delivery-side cooling flow path to the female-rotor-side cooling flow path.
    • Advantages of the Invention
  • According to the present invention, the cooling efficiency can be increased.
  • Purposes, configurations, and effects other than the description given above become apparent from the following description.
    • Brief Description of the Drawings
    • FIG. 1 is a vertical cross-sectional view for illustrating a structure of a screw compressor in a first embodiment of the present invention.
    • FIG. 2 is a horizontal cross-sectional view for illustrating the structure of the screw compressor in the first embodiment of the present invention.
    • FIG. 3 is a transparent perspective view of a main casing for illustrating an overall structure of a casing cooling flow path in the first embodiment of the present invention.
    • FIG. 4 is a horizontal cross-sectional view of the main casing for illustrating a structure of a delivery-side cooling flow path in the first embodiment of the present invention.
    • FIG. 5 is a vertical cross-sectional view of the main casing for illustrating structures of a male-rotor-side cooling flow path and a supply flow path in the first embodiment of the present invention.
    • FIG. 6 is a vertical cross-sectional view of the main casing for illustrating a structure of a female-rotor-side cooling flow path in the first embodiment of the present invention.
    • FIG. 7 is a transparent perspective view of the main casing for illustrating the overall structure of the casing cooling flow path in a modification example of the present invention.
    • FIG. 8 is a vertical cross-sectional view for illustrating a structure of a screw compressor in a second embodiment of the present invention.
    • FIG. 9 is a transparent perspective view of the main casing for illustrating an overall structure of a casing cooling flow path in the second embodiment of the present invention.
    • FIG. 10 is a horizontal cross-sectional view of the main casing for illustrating a structure of a delivery-side cooling flow path in the second embodiment of the present invention.
    • FIG. 11 is a vertical cross-sectional view of the main casing for illustrating a structure of a male-rotor-side cooling flow path in the second embodiment of the present invention.
    • FIG. 12 is a vertical cross-sectional view of the main casing for illustrating a structure of a female-rotor-side cooling flow path in the second embodiment of the present invention.
    Modes for Carrying Out the Invention
  • A description is now given of a first embodiment of the present invention with reference to drawings.
  • FIG. 1 is a vertical cross-sectional view for illustrating a structure of a screw compressor in the present embodiment. FIG. 2 is a horizontal cross-sectional view for illustrating the structure of the screw compressor in the present embodiment. Note that, in FIG. 1, a delivery-side cooling flow path and a bearing-side cooling flow path described later are illustrated and, in FIG. 2, illustration of a male-rotor-side cooling flow path and a female-rotor-side cooling flow path described later is omitted.
  • The screw compressor according to the present embodiment includes a male rotor 1A that is disposed on one side (an upper side of FIG. 2) in a horizontal direction, a female rotor 1B that is disposed on an opposite side (a lower side of FIG. 2) in the horizontal direction and rotates so as to mesh with the male rotor 1A, a intake-side bearing 2A and delivery-side bearings 3A that rotatably support the male rotor 1A, a intake-side bearing 2B and delivery-side bearings 3B that rotatably support the female rotor 1B, and a casing 4 that accommodates the male rotor 1A, the female rotor 1B, the intake-side bearings 2A and 2B, and the delivery-side bearings 3A and 3B. The male rotor 1A and the female rotor 1B are disposed such that an axial direction (a left-right direction of FIG. 1 and FIG. 2) thereof is in the horizontal direction.
  • A shaft portion of the male rotor 1A on one side (a left side of FIG. 1 and FIG. 2) protrudes from the casing 4 and is connected to a rotating machine (in details, a motor or the like) via, for example, a gear mechanism or a belt mechanism. As a result, a rotational force of the rotating machine is transmitted to the male rotor 1A and hence the male rotor 1A rotates.
  • A timing gear (not illustrated) is provided to a shaft portion of the male rotor 1A on the other side (a right side of FIG. 1 and FIG. 2), a timing gear (not illustrated) is also provided to a shaft portion of the female rotor 1B, and these timing gears mesh with each other. As a result, a rotational force of the male rotor 1A is transmitted to the female rotor 1B, and the female rotor 1B rotates in a state in which a lobe section of the male rotor 1A and a lobe section of the female rotor 1B are not in contact with each other.
  • The casing 4 is formed of, for example, a main casing 5 and an intake-side casing 6 connected to the main casing 5. The main casing 5 includes a male-rotor-side bore 7A which accommodates the lobe section of the male rotor 1A and forms a plurality of compression chambers in grooves thereof and a female-rotor-side bore 7B which accommodates the lobe section of the female rotor 1B and forms a plurality of compression chambers in grooves thereof. Each of the male-rotor-side bore 7A and the female-rotor-side bore 7B forms a cylindrical shape, and the male-rotor-side bore 7A and the female-rotor-side bore 7B are disposed so as to partially overlap with each other.
  • Each compression chamber moves from the one side (the left side of FIG. 1 and FIG. 2) in the rotor shaft direction to the opposite side (the right side of FIG. 1 and FIG. 2) as the male rotor 1A and the female rotor 1B rotate, and changes in a volume. As a result, each working chamber is configured to sequentially execute an intake process of taking in gas such as air, a compression process of compressing the gas, and a delivery process of delivering the compressed gas.
  • The main casing 5 includes an intake port (opening) 8 formed in a lower surface on one side in the vertical direction and a delivery port (opening) 9 formed in an upper surface on an opposite side in the vertical direction. An intake flow path 10 which establishes communication between the intake port 8 and the compression chambers in the intake process is formed in the main casing 5 and the intake-side casing 6. A delivery flow path 11 which establishes communication between the delivery port 9 and the compression chambers in the delivery process is formed in the main casing 5.
  • In the present embodiment, in order to suppress thermal expansion of the main casing 5 and the like due to compression heat, a casing cooling flow path 12 is formed in the main casing 5 such that cooling liquid such as water or oil flows through the casing cooling flow path 12.
  • A structure of the casing cooling flow path 12 in the present embodiment is described with reference to FIG. 3 to FIG. 6 and FIG. 1 described above. FIG. 3 is a transparent perspective view of the main casing 5 for illustrating the overall structure of the casing cooling flow path 12 in the present embodiment. Note that, in FIG. 3, an external shape of the main casing 5 is indicated by two-dot chain lines, and the male-rotor-side bore 7A, the female-rotor-side bore 7B, and the delivery flow path 11 are partially indicated by two-dot chain lines. FIG. 4 is a horizontal cross-sectional view (a cross-sectional view as viewed from the upper side) of the main casing for illustrating the structure of the delivery-side cooling flow path in the present embodiment. FIG. 5 is a vertical cross-sectional view (a cross-sectional view taken along a line V-V of FIG. 4) of the main casing for illustrating a structure of the male-rotor-side cooling flow path and the supply flow path in the present embodiment. FIG. 6 is a vertical cross-sectional view (cross-sectional view taken along a line VI-VI of FIG. 4) of the main casing for illustrating a structure of the female-rotor-side cooling flow path in the present embodiment.
  • The casing cooling flow path 12 includes a delivery-side cooling flow path 13 that is formed on the upper side of the main casing 5 and over an entire outer circumference of the delivery flow path 11 (in other words, an entire circumference of a cross section vertical to a flow direction of the cooling liquid), a male-rotor-side cooling flow path 14 that is formed on the one side in the horizontal direction (in other words, on the male rotor side) of the main casing 5 and is connected to the delivery-side cooling flow path 13, a female-rotor-side cooling flow path 15 that is formed on the opposite side of the main casing 5 in the horizontal direction (in other words, on the female rotor side) and is connected to the delivery-side cooling flow path 13, and a bearing-side cooling flow path 16 (see FIG. 1) that is formed on a lower side of the main casing 5 so as to be closer to the delivery-side bearings 3A and 3B relative to the intake flow path 10 and is connected between the male-rotor-side cooling flow path 14 and the female-rotor-side cooling flow path 15.
  • Moreover, the casing cooling flow path 12 includes a vertical rib 17 that is provided on the one side (in other words, the male rotor side) in the horizontal direction of the main casing 5 and extends in the vertical direction, a supply flow path 18 that is separated from the male-rotor-side cooling flow path 14 by the vertical rib 17 and is connected to the delivery-side cooling flow path 13, an inlet 19 that is provided on the one side in the horizontal direction and on the lower side of the main casing 5 (in details, on a lower side of the supply flow path 18), and an outlet 20 that is provided on the opposite side in the horizontal direction and on the upper side of the main casing 5. To the inlet 19 and the outlet 20, pipes 21A and 21B are connected, respectively.
  • Cooling water is supplied from the outside to the delivery-side cooling flow path 13 via the pipe 21A, the inlet 19, and the supply flow path 18 and flows through the delivery-side cooling flow path 13. A part of the cooling water which has flowed through the delivery-side cooling flow path 13 does not flow out to the male-rotor-side cooling flow path 14 and female-rotor-side cooling flow path 15 and is discharged to the outside via the outlet 20 and the pipe 21B. A part of the cooling water which has flowed through the delivery-side cooling flow path 13 flows into the male-rotor-side cooling flow path 14, flows through the male-rotor-side cooling flow path 14, the bearing-side cooling flow path 16, and the female-rotor-side cooling flow path 15 in this order, and is discharged to the outside via the outlet 20 and the pipe 21B. A part of the cooling water which has flowed through the delivery-side cooling flow path 13 flows into an upper-side portion of the female-rotor-side cooling flow path 15, flows through the upper side portion of the female-rotor-side cooling flow path 15, and is discharged to the outside via the outlet 20 and the pipe 21B.
  • As the most significant characteristic of the present embodiment, the casing cooling flow path 12 includes a horizontal rib 22 provided to the male-rotor-side cooling flow path 14 so as to extend in the rotor shaft direction (the left-right direction of FIG. 5) and a horizontal rib 23 provided to the female-rotor-side cooling flow path 15 so as to extend in the rotor shaft direction (the left-right direction of FIG. 6). Positions of the horizontal ribs 22 and 23 in the vertical direction (the upper-lower direction of FIG. 5 and FIG. 6) are the same as an axial center of the male rotor 1A and an axial center of the female rotor 1B.
  • The horizontal rib 22 occupies, for example, 50% to 90% of a width of the male-rotor-side cooling flow path 14 in the rotor shaft direction, and hence suppresses the inflow of the cooling liquid from the delivery-side cooling flow path 13 to the male-rotor-side cooling flow path 14. The horizontal rib 23 occupies, for example, 50% to 90% of a width of the female-rotor-side cooling flow path 15 in the rotor shaft direction, and hence suppresses the inflow of the cooling liquid from the delivery-side cooling flow path 13 to the female-rotor-side cooling flow path 15. As a result, a flow rate of the cooling water in the male-rotor-side cooling flow path 14, the female-rotor-side cooling flow path 15, and the bearing-side cooling flow path 16 can be reduced, and a flow rate of the cooling water in the delivery-side cooling flow path 13 can be increased by the reduced amount. Thus, it is possible to increase cooling capability for a portion around the delivery flow path 11, thereby being able to increase cooling efficiency.
  • Moreover, in the present embodiment, the inlet 19 of the casing cooling flow path 12 is provided on the lower side of the casing 14 and the outlet 20 is provided on the upper side of the casing 4. As a result, compared with a case in which the inlet of the casing cooling flow path 12 is provided on the upper side of the casing 4 and the outlet is provided on the lower side of the casing 4, it is possible to suppress an occurrence of trapped air in the casing cooling flow path 12.
  • Note that there is exemplified the case in which the inlet 19 of the casing cooling flow path 12 is provided on the one side in the horizontal direction and on the lower side of the casing 4, and the outlet 20 is disposed on the opposite side in the horizontal direction and on the upper side of the casing 4 in the first embodiment, but the configuration is not limited to this example. As in a modification example illustrated in FIG. 7, the outlet 20 of the casing cooling flow path 12 may be disposed on the upper side and between the axial center of the male rotor 1A and the axial center of the female rotor 1B in the horizontal direction of the casing 4.
  • As another example, the inlet 19 of the casing cooling flow path 12 may be provided on the opposite side in the horizontal direction and the lower side of the casing 4, and the outlet 20 may be disposed on the one side in the horizontal direction and on the upper side of the casing 4, which is not illustrated. In this case, it is only required that the vertical rib 17 is provided on the opposite side in the horizontal direction of the casing 4 and the supply flow path 18 is separated from the female-rotor-side cooling flow path 15 by the vertical rib 17.
  • Moreover, in the first embodiment, there is exemplified the case in which the positions of the horizontal ribs 22 and 23 in the vertical direction are the same as the axial center of the male rotor 1A and the axial center of the female rotor 1B, but the configuration is not limited to this case. The positions of the horizontal ribs 22 and 23 in the vertical direction may be on the delivery port 9 side (that is, the upper side) relative to the axial center of the male rotor 1A and the axial center of the female rotor 1B.
  • A description is now given of a second embodiment of the present invention with reference to drawings. Note that portions in the present embodiment that are equivalent to their counterparts in the first embodiment are given the same reference characters and explanation thereof is omitted as appropriate.
  • FIG. 8 is a vertical cross-sectional view for illustrating a structure of a screw compressor in the present embodiment.
  • In the present embodiment, the main casing 5 includes an intake port (opening) 8A formed in the upper surface on the one side in the vertical direction and a delivery port (opening) 9A formed in the lower surface on the opposite side in the vertical direction. An intake flow path 10A which establishes communication between the intake port 8A and the compression chambers in the intake process is formed in the intake-side casing 6. A delivery flow path 11A which establishes the communication between the delivery port 9A and the compression chambers in the delivery process is formed in the main casing 5.
  • In the present embodiment, in order to suppress the thermal expansion of the main casing 5 and the like due to the compression heat, a casing cooling flow path 12A is formed in the main casing 5 such that the cooling liquid such as water or oil flows through the casing cooling flow path 12A.
  • A structure of the casing cooling flow path 12A in the present embodiment is described with reference to FIG. 9 to FIG. 12 and FIG. 8 described above. FIG. 9 is a transparent perspective view of the main casing 5 for illustrating an overall structure of the casing cooling flow path 12A in the present embodiment. Note that, in FIG. 9, the external shape of the main casing 5 is indicated by two-dot chain lines and the male-rotor-side bore 7A, the female-rotor-side bore 7B, and the delivery flow path 11A are partially indicated by two-dot chain lines. FIG. 10 is a horizontal cross-sectional view (cross-sectional view as viewed from the lower side) of the main casing for illustrating a structure of a delivery-side cooling flow path in the present embodiment. FIG. 11 is a vertical cross-sectional view (cross-sectional view taken along a line XI-XI of FIG. 10) of the main casing for illustrating a structure of a male-rotor-side cooling flow path in the present embodiment. FIG. 12 is a vertical cross-sectional view (cross-sectional view taken along a line XII-XII of FIG. 10) of the main casing for illustrating a structure of a female-rotor-side cooling flow path in the present embodiment.
  • The casing cooling flow path 12A includes a delivery-side cooling flow path 13A that is formed on the lower side of the main casing 5 and over an entire outer circumference of the delivery flow path 11A, a male-rotor-side cooling flow path 14A that is formed on the one side in the horizontal direction (in other words, on the male rotor side) of the main casing 5 and is connected to the delivery-side cooling flow path 13A, a female-rotor-side cooling flow path 15A that is formed on the opposite side of the main casing 5 in the horizontal direction (in other words, on the female rotor side) and is connected to the delivery-side cooling flow path 13A, and a bearing-side cooling flow path 16A (see FIG. 8) that is formed on the upper side of the main casing 5 so as to be closer to the delivery-side bearings 3A and 3B relative to the intake flow path 10 and is connected between the male-rotor-side cooling flow path 14A and the female-rotor-side cooling flow path 15A.
  • In addition, the casing cooling flow path 12A includes the inlet 19 that is provided on the one side in the horizontal direction and on the lower side of the main casing 5, the outlet 20 that is provided on the opposite side in the horizontal direction and on the upper side of the main casing 5, and a vertical rib 24 that is provided so as to extend in the vertical direction of the female-rotor-side cooling flow path 15A and promotes outflow of the cooling liquid from the female-rotor-side cooling flow path 15A.
  • The cooling water is supplied from the outside to the delivery-side cooling flow path 13A via the pipe 21A and the inlet 19 and flows through the delivery-side cooling flow path 13A. A part of the cooling water which has flowed through the delivery-side cooling flow path 13A flows into the male-rotor-side cooling flow path 14A, flows through the male-rotor-side cooling flow path 14A and the bearing-side cooling flow path 16A in this order, and is discharged to the outside via the outlet 20 and the pipe 21B. A part of the cooling water which has flowed through the delivery-side cooling flow path 13A flows into the female-rotor-side cooling flow path 15A, flows through the female-rotor-side cooling flow path 15A, and is discharged to the outside via the outlet 20 and the pipe 21B.
  • As the most significant characteristic of the present embodiment, the casing cooling flow path 12A includes a horizontal rib 22A provided to the male-rotor-side cooling flow path 14A so as to extend in the rotor shaft direction (the left-right direction of FIG. 11) and a horizontal rib 23A provided to the female-rotor-side cooling flow path 15A so as to extend in the rotor shaft direction (the left-right direction of FIG. 12). Positions of the horizontal ribs 22A and 23A in the vertical direction (the upper-lower direction of FIG. 11 and FIG. 12) are the same as the axial center of the male rotor 1A and the axial center of the female rotor 1B.
  • The horizontal rib 22A occupies, for example, 50% to 90% of a width of the male-rotor-side cooling flow path 14A in the rotor shaft direction, and hence suppresses the inflow of the cooling liquid from the delivery-side cooling flow path 13A to the male-rotor-side cooling flow path 14A. The horizontal rib 23A occupies, for example, 50% to 90% of a width of the female-rotor-side cooling flow path 15A in the rotor shaft direction, and hence suppresses the inflow of the cooling liquid from the delivery-side cooling flow path 13A to the female-rotor-side cooling flow path 15A. As a result, a flow rate of the cooling water in the male-rotor-side cooling flow path 14A, the female-rotor-side cooling flow path 15A, and the bearing-side cooling flow path 16A can be reduced, and a flow rate of the cooling water in the delivery-side cooling flow path 13A can be increased by the reduced amount. Thus, it is possible to increase cooling capability for a portion around the delivery flow path 11A, thereby being able to increase cooling efficiency.
  • Moreover, in the present embodiment, the inlet 19 of the casing cooling flow path 12A is provided on the lower side of the casing 4, and the outlet 20 is provided on the upper side of the casing 4. As a result, compared with a case in which the inlet of the casing cooling flow path 12A is provided on the upper side of the casing 4 and the outlet is provided on the lower side of the casing 4, it is possible to suppress an occurrence of trapped air in the casing cooling flow path 12A.
  • Note that there is exemplified the case in which the inlet 19 of the casing cooling flow path 12A is provided on the one side in the horizontal direction and on the lower side of the casing 4 and the outlet 20 is disposed on the opposite side in the horizontal direction and on the upper side of the casing 4 in the second embodiment, but the configuration is not limited to this example. The outlet 20 of the casing cooling flow path 12A may be disposed on the upper side and between the axial center of the male rotor 1A and the axial center of the female rotor 1B in the horizontal direction of the casing 4 (see FIG. 7 described before). As another example, the inlet 19 of the casing cooling flow path 12A may be provided on the opposite side in the horizontal direction and on the lower side of the casing 4, and the outlet 20 may be disposed on the one side in the horizontal direction and on the upper side of the casing 4, which is not illustrated.
  • Moreover, in the second embodiment, there is exemplified the case in which the vertical rib 24 is provided to only the female-rotor-side cooling flow path 15A, but the configuration is not limited to this example. The vertical rib 24 may be provided to only the male-rotor-side cooling flow path 14A, or may be provided to both of the male-rotor-side cooling flow path 14A and the female-rotor-side cooling flow path 15A.
  • Moreover, in the second embodiment, there is exemplified the case in which the positions of the horizontal ribs 22A and 23A in the vertical direction are the same as the axial center of the male rotor 1A and the axial center of the female rotor 1B, but the configuration is not limited to this case. The positions of the horizontal ribs 22A and 23A in the vertical direction may be on the delivery port 9 side (that is, the lower side) relative to the axial center of the male rotor 1A and the axial center of the female rotor 1B.
  • Note that, there is above exemplified the case in which the screw compressor is configured such that the rotational force of the male rotor 1A is transmitted to the female rotor 1B through the meshing between the timing gears, but the configuration is not limited to this example, and there may be provided such a configuration that the rotational force of the male rotor 1A is transmitted to the female rotor 1B through, for example, meshing between the lobe section of the male rotor 1A and the lobe section of the female rotor 1B. Moreover, there is exemplified the case in which the shaft portion of the male rotor 1A is connected to the rotating machine in the screw compressor, but the configuration is not limited to this example and the shaft portion of the female rotor 1B may be connected to the rotating machine. Moreover, there is exemplified the case in which the screw compressor is of the no-liquid-supply type (in details, gas such as the air is compressed while liquid such as oil or water is not supplied to the working chambers), but the type is not limited to this case, and the screw compressor may be of the liquid-supply type (in details, gas such as the air is compressed while liquid such as oil or water is supplied to the working chambers).
    • Description of Reference Characters
    • 1A: Male rotor
    • 1B: Female rotor
    • 2A, 2B: Intake-side bearing
    • 3A, 3B: Delivery-side bearing
    • 4: Casing
    • 8, 8A: Intake port
    • 9, 9A: Delivery port
    • 10, 10A: Intake flow path
    • 11, 11A: Delivery flow path
    • 12, 12A: Casing cooling flow path
    • 13, 13A: Delivery-side cooling flow path
    • 14, 14A: Male-rotor-side cooling flow path
    • 15, 15A: Female-rotor-side cooling flow path
    • 16, 16A: Bearing-side cooling flow path
    • 17: Vertical rib
    • 18: Supply flow path
    • 19: Inlet
    • 20: Outlet
    • 22, 22A: Horizontal rib
    • 22, 23A: Horizontal rib
    • 24: Vertical rib

Claims (6)

  1. A screw compressor, comprising:
    a male rotor that is disposed on one side in a horizontal direction;
    a female rotor that is disposed on an opposite side in the horizontal direction and rotates so as to mesh with the male rotor;
    intake-side bearings and delivery-side bearings that rotatably support the male rotor and the female rotor;
    a casing that accommodates the male rotor, the female rotor, the intake-side bearings, and the delivery-side bearings and forms a plurality of compression chambers in grooves of the male rotor and the female rotor;
    an intake flow path that establishes communication between an intake port formed on one side in a vertical direction of the casing and compression chambers in an intake process;
    a delivery flow path that establishes communication between a delivery port formed on an opposite side in the vertical direction of the casing and compression chambers in a delivery process; and
    a casing cooling flow path that is formed in the casing and through which cooling liquid flows, wherein
    the casing cooling flow path includes
    a delivery-side cooling flow path that is formed on the opposite side in the vertical direction of the casing and over an entire outer circumference of the delivery flow path,
    a male-rotor-side cooling flow path that is formed on the one side in the horizontal direction of the casing and into which the cooling liquid flows from the delivery-side cooling flow path,
    a female-rotor-side cooling flow path that is formed on the opposite side in the horizontal direction of the casing and into which the cooling liquid flows from the delivery-side cooling flow path,
    a first horizontal rib that is provided to the male-rotor-side cooling flow path so as to extend in a rotor shaft direction, and suppresses the inflow of the cooling liquid from the delivery-side cooling flow path to the male-rotor-side cooling flow path, and
    a second horizontal rib that is provided to the female-rotor-side cooling flow path so as to extend in the rotor shaft direction, and suppresses the inflow of the cooling liquid from the delivery-side cooling flow path to the female-rotor-side cooling flow path.
  2. The screw compressor according to claim 1, wherein positions of the first and second horizontal ribs in the vertical direction are same as an axial center of the male rotor and an axial center of the female rotor or are on the delivery port side relative to the axial center of the male rotor and the axial center of the female rotor.
  3. The screw compressor according to claim 1, wherein
    the casing cooling flow path includes
    an inlet that is provided on a lower side of the casing and to which the cooling liquid is supplied from an outside, and
    an outlet that is provided on an upper side of the casing and from which the cooling liquid is discharged to the outside.
  4. The screw compressor according to claim 3, wherein
    the delivery port is formed on an upper side of the casing, and
    the casing cooling flow path includes
    a vertical rib that is provided on the one side or the opposite side of the casing in the horizontal direction and extends in the vertical direction, and
    a supply flow path that is separated from the male-rotor-side cooling flow path or the female-rotor-side cooling flow path by the vertical rib, and supplies the cooling liquid supplied via the inlet from the outside to the delivery-side cooling flow path.
  5. The screw compressor according to claim 3, wherein
    the delivery port is formed on the lower side of the casing, and
    the casing cooling flow path includes
    a vertical rib that is provided to at least one of the male-rotor-side cooling flow path and the female-rotor-side cooling flow path so as to extend in the vertical direction, and promotes outflow of the cooling liquid from at least one of the male-rotor-side cooling flow path and the female-rotor-side cooling flow path.
  6. The screw compressor according to claim 1, wherein
    the casing cooling flow path includes
    a bearing-side cooling flow path that is formed on the one side in the vertical direction of the casing so as to be closer to the delivery-side bearings relative to the intake flow path, and is connected between the male-rotor-side cooling flow path and the female-rotor-side cooling flow path.
EP23897094.1A 2022-11-30 2023-05-17 Screw compressor Pending EP4628730A1 (en)

Applications Claiming Priority (2)

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JP2022192203A JP2024079326A (en) 2022-11-30 2022-11-30 Screw Compressor
PCT/JP2023/018433 WO2024116433A1 (en) 2022-11-30 2023-05-17 Screw compressor

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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05231362A (en) 1992-02-25 1993-09-07 Hitachi Ltd Screw fluid machinery

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61169688A (en) * 1985-01-23 1986-07-31 Hitachi Ltd screw fluid machine
JPS6295185U (en) * 1985-12-05 1987-06-17
JP4062001B2 (en) * 2001-10-19 2008-03-19 株式会社デンソー Gas compression device
JP4075433B2 (en) * 2002-03-28 2008-04-16 株式会社Ｉｈｉ Screw turbocharger cooling structure
JP6952895B2 (en) * 2018-06-28 2021-10-27 株式会社日立産機システム Compressor
CN110500275B (en) * 2019-09-23 2021-03-16 兑通真空技术(上海)有限公司 Pump housing structure of triaxial multistage roots pump
JP7507717B2 (en) * 2021-03-31 2024-06-28 株式会社日立産機システム Screw Compressor

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05231362A (en) 1992-02-25 1993-09-07 Hitachi Ltd Screw fluid machinery

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