WO2017104326A1 - Compresseur à vis - Google Patents

Compresseur à vis Download PDF

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Publication number
WO2017104326A1
WO2017104326A1 PCT/JP2016/083627 JP2016083627W WO2017104326A1 WO 2017104326 A1 WO2017104326 A1 WO 2017104326A1 JP 2016083627 W JP2016083627 W JP 2016083627W WO 2017104326 A1 WO2017104326 A1 WO 2017104326A1
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WO
WIPO (PCT)
Prior art keywords
rotor
meshing
female
gap
male
Prior art date
Application number
PCT/JP2016/083627
Other languages
English (en)
Japanese (ja)
Inventor
美奈子 金田
紘太郎 千葉
土屋　豪
正彦 高野
Original Assignee
株式会社日立産機システム
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 株式会社日立産機システム filed Critical 株式会社日立産機システム
Priority to JP2017556425A priority Critical patent/JPWO2017104326A1/ja
Publication of WO2017104326A1 publication Critical patent/WO2017104326A1/fr

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    • 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

Definitions

  • the present invention relates to a screw compressor.
  • the screw compressor for example, there is a direct drive type screw compressor in which a pair of rotors are engaged with each other and driven. And a suction bearing and a discharge bearing for instructing a pair of rotors to rotate freely.
  • the male rotor of the pair of rotors is connected to the motor.
  • the male rotor connected to the motor begins to rotate.
  • the female rotor meshing with each other in the male rotor and the lobe starts to rotate by receiving the rotating force of the male rotor.
  • the male and female rotors rotate, the volume of the working chamber formed by the two rotor lobes decreases. As the volume of the working chamber is reduced, the fluid in the working chamber is compressed.
  • the rotor is preliminarily provided with a gap between the male rotor and the female rotor for the reasons described below.
  • the gap between the male rotor and the female rotor may be reduced due to manufacturing tolerances of the rotor. Therefore, in order to prevent the rotors from contacting and seizing, it is necessary to process with a gap between the male rotor and the female rotor in advance.
  • Patent Document 1 is an invention relating to a gear-driven compressor in which a male rotor and a female rotor are rotationally driven via a timing gear.
  • Patent Document 1 aims to reduce the gap between the male rotor and the female rotor and the gap between the casing and the male rotor and the female rotor by coating the rotor surface to prevent leakage of compressed air.
  • at least one surface of a rotor and a casing is coated.
  • Patent Document 1 describes a coating method including a step of first applying a coating with a non-uniform excess thickness and leveling the member to a predetermined uniform thickness before assembling the members. ing.
  • an object of the present invention is to reduce the leakage of compressed air by reducing the gap formed by the non-engaged surfaces of the rotor.
  • a screw rotor and a casing that houses the screw rotor are included, and the screw rotor meshes with the mating rotor to drive the mating rotor, and the mating rotor.
  • a non-engaging surface that does not contribute to driving, and a coating layer is formed on the non-engaging surface so as to fill a gap formed by the non-engaging surface.
  • Compressed air leakage can be reduced by reducing the gap formed by the non-engaged surfaces of the rotor.
  • FIG. 1 is a radial cross-sectional view of a screw rotor according to Example 1.
  • FIG. It is an axial sectional view showing the whole structure of a screw compressor. It is sectional drawing seen from the side surface which shows the whole structure of a screw compressor. It is radial direction sectional drawing of the rotor in a certain angle.
  • FIG. 5 is a radial cross-sectional view of the rotor in a state where the male rotor and the female rotor are rotated at a predetermined angle from FIG. 4 and meshed with each other.
  • FIG. 6 is a radial cross-sectional view of a rotor according to Example 2;
  • FIG. 1 is a radial sectional view of a rotor according to a first embodiment
  • FIG. 2 is an axial sectional view showing the overall structure of a screw compressor to which the rotor of the present invention is applied
  • FIG. 3 is a side view of FIG. It is an axial sectional view.
  • the screw compressor 1 houses a male rotor 3 and a female rotor 2 that rotate in parallel with each other so that the helical teeth mesh with each other, and a plurality of compression working chambers 12 that house the male rotor 3 and the female rotor 2.
  • a casing 4 is formed.
  • the casing 4 has a substantially cylindrical bore 21 for housing the male rotor 3 and the female rotor 2, a suction port 13 for sucking fluid into the compression working chamber 12, and the compressed fluid outside the discharge working chamber.
  • a discharge port 14 is provided for discharging to the outlet.
  • the male rotor 3 and the female rotor 2 are rotatably supported by radial bearings 15, respectively.
  • a motor (not shown) is connected to the shaft 9 of the male rotor 3.
  • the male rotor 3 connected to the motor starts rotating.
  • the female rotor 2 meshing with the male rotor 3 by the lobe also starts rotating.
  • gas is sucked into the compression chamber working chamber 12 from the suction port 13 provided in the casing 4.
  • the volume of the compression working chamber 12 formed by the lobes of the two rotors is reduced while moving from the suction port 13 side to the discharge port 14 side as the rotor rotates.
  • the gas flowing in from the suction port moves to the discharge side while being compressed.
  • the rotation angle of the rotor reaches a predetermined angle, the compressed fluid is discharged out of the compression working chamber 12 through the discharge port 14 provided in the casing 4.
  • FIG. 4 illustrates the male rotor 3 and the female rotor 2 at a certain rotation angle.
  • FIG. 5 illustrates a state in which the male rotor 3 and the female rotor 2 are rotated at a predetermined angle from FIG. 4 and the male rotor and the female rotor are engaged with each other.
  • the male rotor 3 and the female rotor 2 at a certain angle have surfaces that mesh with each other and surfaces that do not mesh with each other.
  • the male rotor 3 and the female rotor 2 mesh with each other by the meshing surface 16.
  • the meshing surface is a surface in which the male rotor 3 and the female rotor 2 mesh with each other's rotor and contribute to driving the female rotor 2 that is not connected to the motor.
  • a surface that does not mesh with the mating rotor and does not contribute to driving of the female rotor 2 is referred to as a non-meshing surface.
  • the male rotor 3 drives the female rotor 2 by the meshing surface 16.
  • the male rotor 3 and the female rotor 2 have a meshing surface and a non-meshing surface in a steady state.
  • the non-meshing surface 18 of the male rotor 3 and the non-meshing surface 17 of the female rotor 2 are in a non-contact state.
  • a gap 19 exists between the non-meshing surface 18 of the male rotor 3 and the non-meshing surface 17 of the female rotor 2.
  • the gap 19 exists between a compression working chamber in which compressed high-pressure fluid exists and a compression working chamber in which fluid that has not been compressed exists. Therefore, the compressed fluid leaks through the gap 19 to the compression working chamber on the low pressure side.
  • a coating layer that fills the gap 19 is formed. On the other hand, such a coating layer is not formed on the meshing surface 16. As a result, when the meshing surfaces are coated with each other, it is possible to prevent the occurrence of the problem described in the problem to be solved by the present invention and to reduce the gap 19.
  • the coating layer only needs to be formed on at least one of the non-meshing surface 18 of the male rotor 3 and the non-meshing surface 17 of the female rotor 2.
  • At least one of graphite, molybdenum disulfide, PTFE, graphite fluoride, boron nitride, and the like is applied to the surfaces of the non-engagement surfaces 17 and 18, so that the surfaces are easily worn and smooth.
  • the non-meshing surface 18 of the male rotor 3 and the non-meshing surface 17 of the female rotor 2 come into contact with each other during an unsteady operation such as before the operation is stopped or immediately after the operation is started, no seizure occurs.
  • the gap 19 between the non-meshing surface 18 of the male rotor 3 and the non-meshing surface 17 of the female rotor 2 can be processed in advance.
  • the wear between the non-meshing surfaces to which the coating is applied is more easily worn than the wear between the meshing surfaces.
  • the non-meshing surfaces can be worn together without causing the meshing surfaces to wear. If there is an extra coating layer, for example, due to wear between the non-meshing surfaces, these are scraped off to provide an appropriate gap 19. Can be formed.
  • the gap 19 When the gap 19 is reduced, the amount of compressed fluid leaking from the high pressure side to the low pressure side space is reduced. Compressor efficiency can be improved by reducing leakage of the compressed fluid. Further, since the non-meshing surface 18 of the male rotor 3 and the non-meshing surface 17 of the female rotor are not in contact with each other during the steady operation of the compressor, the area of the gap 19 does not increase due to a long-time operation. Since the area of the gap 19 does not increase by operation, the amount of leakage of compressed air does not increase by operation of the compressor, and stable compressor performance can be maintained over a long period of time.
  • the processing time can be shortened.
  • the compressor efficiency is improved by reducing the leakage of compressed air. Since the gap between the rotors does not change regardless of the operation time of the compressor, stable compressor performance can be maintained over a long period of time.
  • a high-functional coating such as low friction, and processing costs can be reduced.
  • FIG. 6 is a cross-sectional view of the screw rotor according to the second embodiment.
  • the coating 5 is applied to the surface of the non-meshing surface 17, so that the non-meshing surface 18 of the male rotor 3 and the female rotor 2 are in an unsteady operation such as before operation stop or immediately after operation start. Even if the non-meshing surface 17 comes into contact, it does not seize. Even if the male rotor 3 and the female rotor 2 rise in temperature during operation, thermal expansion occurs, and even if the non-meshing surface 18 of the male rotor 3 and the non-meshing surface 17 of the female rotor come into contact with each other, seizure does not occur.
  • the gap 19 between the non-meshing surface 18 of the male rotor 3 and the non-meshing surface 17 of the female rotor 2 can be set small. If the gap 19 is reduced, the amount of leakage of the compressed fluid can be reduced. Compressor efficiency is improved by reducing the leakage of the compressed fluid. Further, the non-meshing surface 18 of the male rotor 3 and the non-meshing surface 17 of the female rotor do not contact during the steady operation of the compressor. Therefore, the wear of the coating hardly occurs, and the area of the gap 19 does not increase after a long operation.
  • the area of the gap 19 does not increase due to operation, stable compressor performance can be maintained over a long period of time regardless of the operation of the compressor.
  • the coating is applied only to the non-meshing surface 17 of the female rotor 2 that does not apply a high surface pressure during steady operation, it is not necessary to use a highly functional coating such as low friction, and processing costs can be reduced. Further, since it is not necessary to finish the surface roughness of the non-meshing surface 17 of the female rotor 2 to be coated with high accuracy, the processing time can be shortened.
  • the present invention has been described by taking a screw-type air compressor that compresses air as an example.
  • the present invention is not limited to air but can be used in general for screw compressors that compress gas.
  • the screw compressor provided with a male and female paired screw rotor was demonstrated, this invention can be used also for the screw compressor of a trirotor.

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

Abstract

L'objet de la présente invention est de fournir un compresseur à vis dans lequel la fuite d'air comprimé est réduite par réduction de l'espace entre un rotor menant et un rotor mené. Un compresseur à vis comporte des rotors à vis et un carter qui loge les rotors à vis. Un rotor à vis comporte : une surface de mise en prise venant en prise avec un rotor antagoniste de sorte à entraîner le rotor antagoniste ; et une surface de non-mise en prise ne venant pas en prise avec le rotor antagoniste et ne contribuant pas à l'entraînement. Le compresseur à vis est caractérisé en ce qu'une couche de revêtement est formée sur la surface de non-mise en prise de sorte à remplir un espace formé par la surface de non-mise en prise.
PCT/JP2016/083627 2015-12-15 2016-11-14 Compresseur à vis WO2017104326A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2017556425A JPWO2017104326A1 (ja) 2015-12-15 2016-11-14 スクリュー圧縮機

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2015-243731 2015-12-15
JP2015243731 2015-12-15

Publications (1)

Publication Number Publication Date
WO2017104326A1 true WO2017104326A1 (fr) 2017-06-22

Family

ID=59056284

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2016/083627 WO2017104326A1 (fr) 2015-12-15 2016-11-14 Compresseur à vis

Country Status (2)

Country Link
JP (1) JPWO2017104326A1 (fr)
WO (1) WO2017104326A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5489514U (fr) * 1977-12-07 1979-06-25
JPS588701U (ja) * 1981-07-10 1983-01-20 株式会社日立製作所 スクリユ−ロ−タ
US20020187064A1 (en) * 1999-06-23 2002-12-12 Danilo Vigano Gas rotary screw compressor
JP2005515067A (ja) * 2002-01-23 2005-05-26 キャリア　コーポレイション 粗面コーティングされた部材を容易に組み付ける方法

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5489514U (fr) * 1977-12-07 1979-06-25
JPS588701U (ja) * 1981-07-10 1983-01-20 株式会社日立製作所 スクリユ−ロ−タ
US20020187064A1 (en) * 1999-06-23 2002-12-12 Danilo Vigano Gas rotary screw compressor
JP2005515067A (ja) * 2002-01-23 2005-05-26 キャリア　コーポレイション 粗面コーティングされた部材を容易に組み付ける方法

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Publication number Publication date
JPWO2017104326A1 (ja) 2018-10-04

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