TW202022233A - Screw compressor - Google Patents

Screw compressor Download PDF

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Publication number
TW202022233A
TW202022233A TW108142886A TW108142886A TW202022233A TW 202022233 A TW202022233 A TW 202022233A TW 108142886 A TW108142886 A TW 108142886A TW 108142886 A TW108142886 A TW 108142886A TW 202022233 A TW202022233 A TW 202022233A
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Taiwan
Prior art keywords
rotor
flow path
suction
female
male
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TW108142886A
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Chinese (zh)
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TWI720701B (en
Inventor
千葉紘太郎
高野正彦
頼金茂幸
森田謙次
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日商日立產機系統股份有限公司
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Publication of TWI720701B publication Critical patent/TWI720701B/en

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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
    • 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
    • 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
    • F04C29/12—Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet
    • 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
    • F04C2240/00—Components
    • F04C2240/20—Rotors
    • 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
    • F04C2240/00—Components
    • F04C2240/30—Casings or housings
    • 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
    • F04C2250/00—Geometry
    • F04C2250/10—Geometry of the inlet or outlet
    • F04C2250/101—Geometry of the inlet or outlet of the inlet

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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 that can reduce a pressure loss of a suction passage. A casing 12 of the screw compressor comprises: a bore 21 that accommodates a tooth part 13A of a male rotor 11A and a tooth part 13B of a female rotor 11B to form function chambers in spaces of the tooth parts 13A and 13B; a suction port 22 that is positioned on an outside in a rotor radial direction; and a suction passage 23 that communicates with the function chambers undergoing a suction process in a rotor axial direction. The suction passage 23 has a male rotor side suction passage 26A that is positioned on a male rotor 11A side and on a downstream side of a virtual plane C, and has a female rotor side suction passage 26B that is positioned on a female rotor 11B side and on the downstream side of the virtual plane C. The male rotor side suction passage 26A is formed so that, in at least a range half an axial pitch P1 of the tooth part 13A from the suction side end of the tooth part 13A of the male rotor 11A in the rotor axial direction, a passage wall 27A on the outside in the rotor radial direction is at the same position as a wall of the bore 21 when seen from the rotor axial direction.

Description

螺旋壓縮機Screw compressor

本發明係關於一種具有位於轉子徑向之外側之吸入口、及對作動室沿轉子軸向連通之吸入流路之螺旋壓縮機。The present invention relates to a screw compressor having a suction port located on the radially outer side of the rotor and a suction flow path communicating with the working chamber along the axial direction of the rotor.

專利文獻1中記載之螺旋壓縮機具備具有齒部之陽轉子、具有與陽轉子之齒部嚙合之齒部之陰轉子、以及收容陽轉子及陰轉子之外殼。The screw compressor described in Patent Document 1 includes a male rotor having teeth, a female rotor having teeth meshing with the teeth of the male rotor, and a housing accommodating the male rotor and the female rotor.

外殼具有收容陽轉子之齒部及陰轉子之齒部且於其等之齒槽形成陽轉子側之作動室及陰轉子側之作動室的內腔。又，外殼具有位於較陽轉子之齒部與陰轉子之齒部更靠轉子徑向之外側的吸入口、及以連接吸入口與吸入行程之作動室之方式形成之吸入流路。又，外殼具有位於較陽轉子之齒部及陰轉子之齒部更靠轉子徑向之外側的噴出口、及以連接噴出口與噴出行程之作動室之方式形成之噴出流路。The casing has an inner cavity for accommodating the teeth of the male rotor and the teeth of the female rotor, and forming the working chamber on the male rotor side and the working chamber on the female rotor side in the tooth grooves of them. In addition, the housing has a suction port located on the outer side of the rotor radial direction than the tooth portion of the male rotor and the tooth portion of the female rotor, and a suction flow path formed to connect the suction port and the operating chamber of the suction stroke. In addition, the housing has an ejection port located on the outer side of the rotor radial direction than the tooth portion of the male rotor and the tooth portion of the female rotor, and an ejection flow path formed by connecting the ejection port and the operating chamber of the ejection stroke.

作動室自轉子軸向之一側向另一側移動，並且其容積發生變化。藉此，作動室依序進行經由吸入流路自吸入口吸入氣體之吸入行程、將氣體壓縮之壓縮行程、及經由噴出流路向噴出口噴出壓縮氣體之噴出行程。The actuating chamber moves from one side of the rotor shaft to the other side, and its volume changes. Thereby, the actuating chamber sequentially performs a suction stroke of sucking gas from the suction port through the suction flow path, a compression stroke of compressing the gas, and a discharge stroke of spraying compressed gas to the discharge port through the discharge flow path.

吸入流路對吸入行程之作動室沿轉子軸向連通。又，吸入流路具有位於陽轉子側且較通過陽轉子之中心軸與陰轉子之中心軸之假想平面更靠下游側(換言之，與吸入口相反側)的陽轉子側吸入流路、及位於陰轉子側且較上述假想平面更靠下游側之陰轉子側吸入流路。 [先前技術文獻] [專利文獻]The suction flow path communicates with the working chamber of the suction stroke along the axial direction of the rotor. In addition, the suction flow path has a suction flow path on the male rotor side that is located on the male rotor side and is on the downstream side (in other words, the side opposite to the suction port) than the virtual plane passing through the central axis of the male rotor and the central axis of the female rotor, and The female rotor side suction flow path on the female rotor side and downstream of the aforementioned imaginary plane. [Prior Technical Literature] [Patent Literature]

[專利文獻1]日本專利特開2012-041910號公報(例如參照圖8、圖9)[Patent Document 1] Japanese Patent Laid-Open No. 2012-041910 (for example, refer to FIGS. 8 and 9)

[發明所欲解決之問題][Problems to be solved by the invention]

於專利文獻1中，陽轉子側吸入流路之轉子徑向外側之流路壁(其中，用以將氣體封入至作動室之部分除外)位於較內腔之壁更靠轉子徑向的外側。因此，作為自陽轉子側吸入流路朝向陽轉子側作動室之氣體之流向之分量，產生轉子徑向之分量，成為壓力損失之增加之因素。In Patent Document 1, the flow path wall outside the rotor radial direction of the suction flow path on the male rotor side (except for the part used to seal the gas into the operating chamber) is located on the outside of the rotor radial direction than the wall of the inner cavity. Therefore, as a component of the flow direction of the gas from the male rotor side suction flow path to the male rotor side working chamber, a component in the radial direction of the rotor is generated, which becomes a factor of increase in pressure loss.

同樣地，陰轉子側吸入流路之轉子徑向外側之流路壁(其中，用以將氣體封入至作動室之壁部分除外)位於較內腔之壁更靠轉子徑向的外側。因此，作為自陰轉子側吸入流路朝向陰轉子側作動室之氣體之流向之分量，產生轉子徑向之分量，成為壓力損失之增加之因素。Similarly, the flow path wall of the suction flow path on the female rotor side in the radial direction outside the rotor (except for the wall part used to seal the gas into the working chamber) is located on the radial outside of the rotor than the wall of the inner cavity. Therefore, as a component of the flow direction of the gas from the female rotor side suction flow path to the female rotor side working chamber, a component in the radial direction of the rotor is generated, which becomes a factor of increase in pressure loss.

本發明係鑒於上述情況而完成者，其課題之一在於減少吸入流路之壓力損失。 [解決問題之技術手段]The present invention was completed in view of the above-mentioned circumstances, and one of its problems is to reduce the pressure loss of the suction flow path. [Technical means to solve the problem]

為了解決上述問題，而應用申請專利範圍中記載之構成。本發明包括複數個解決上述問題之技術手段，但若列舉其一例，則為一種螺旋壓縮機，其具備具有齒部之陽轉子、具有與上述陽轉子之齒部嚙合之齒部之陰轉子、以及收容上述陽轉子及上述陰轉子之外殼，且上述外殼具有：內腔，其收容上述陽轉子之齒部及上述陰轉子之齒部，且於其等之齒槽形成陽轉子側之作動室及陰轉子側之作動室；吸入口，其位於較上述陽轉子之齒部及上述陰轉子之齒部更靠轉子徑向之外側；及吸入流路，其係以連接上述吸入口與吸入行程之作動室之方式形成，且對上述吸入行程之作動室沿轉子軸向連通；而且上述吸入流路具有位於上述陽轉子側且較通過上述陽轉子之中心軸及上述陰轉子之中心軸之假想平面更靠下游側的陽轉子側吸入流路、及位於上述陰轉子側且較上述假想平面更靠下游側之陰轉子側吸入流路，上述陽轉子側吸入流路係以如下方式形成，即，至少於轉子軸向上之自上述陽轉子之齒部之吸入側端面至上述齒部的軸向節距之一半之範圍內，轉子徑向外側之流路壁自轉子軸向觀察時成為與上述內腔之壁相同之位置。 [發明之效果]In order to solve the above-mentioned problems, the composition described in the scope of patent application is applied. The present invention includes a plurality of technical means to solve the above-mentioned problems, but if one example is cited, it is a screw compressor which has a male rotor with teeth, a female rotor with teeth that mesh with the teeth of the male rotor, And a housing for accommodating the male rotor and the female rotor, and the housing has: an inner cavity that houses the teeth of the male rotor and the teeth of the female rotor, and forms an operating chamber on the male rotor side in the tooth grooves of them And the working chamber on the female rotor side; the suction port, which is located on the outer side of the rotor radial direction than the teeth of the male rotor and the tooth of the female rotor; and the suction flow path, which connects the suction port and the suction stroke The working chamber is formed in a manner that communicates with the working chamber of the suction stroke in the axial direction of the rotor; and the suction flow path has an imaginary that is located on the side of the male rotor and passes through the central axis of the male rotor and the central axis of the female rotor. The male rotor side suction flow path on the downstream side of the plane, and the female rotor side suction flow path on the female rotor side and further downstream than the virtual plane. The male rotor side suction flow path is formed as follows: , At least in the rotor axial direction from the suction side end surface of the tooth portion of the male rotor to one-half of the axial pitch of the tooth portion, the flow path wall on the radially outer side of the rotor becomes the same as the above The wall of the inner cavity is at the same position. [Effect of invention]

根據本發明，能夠減少吸入流路之壓力損失。According to the present invention, the pressure loss of the suction flow path can be reduced.

再者，上述以外之問題、構成及效果係藉由以下之說明而明確。In addition, the problems, constitution, and effects other than the above are clarified by the following description.

利用圖1～圖5對本發明之一實施形態進行說明。An embodiment of the present invention will be described with reference to FIGS. 1 to 5.

本實施形態之螺旋壓縮機具備馬達1、由馬達1驅動而將空氣(氣體)壓縮之壓縮機本體2、將自壓縮機本體2噴出之壓縮空氣與其所包含之油(液體)分離之氣液分離器3、及將藉由氣液分離器3分離出之油供給至壓縮機本體2(詳細而言，下述作動室、吸入側軸承、及噴出側軸承)之油配管4。於油配管4設置有將油冷卻之油冷卻器5、或將油中之雜質去除之濾油器6等。The screw compressor of this embodiment includes a motor 1, a compressor body that is driven by the motor 1 to compress air (gas), and a gas-liquid that separates the compressed air ejected from the compressor body 2 from the oil (liquid) contained in it The separator 3 and the oil pipe 4 that supplies the oil separated by the gas-liquid separator 3 to the compressor body 2 (in detail, the operating chamber, the suction side bearing, and the discharge side bearing described below). The oil pipe 4 is provided with an oil cooler 5 to cool the oil, or an oil filter 6 to remove impurities in the oil.

壓縮機本體2具備作為螺旋轉子之陽轉子11A及陰轉子11B、以及收納陽轉子11A及陰轉子11B之外殼12。The compressor body 2 includes a male rotor 11A and a female rotor 11B as spiral rotors, and a housing 12 that houses the male rotor 11A and the female rotor 11B.

陽轉子11A具有具備呈螺旋狀延伸之複數個(於本實施形態中為4個)齒之齒部13A、連接於齒部13A之軸向一側(圖2及圖3之左側)之吸入側軸部14A、及連接於齒部13A之軸向另一側(圖2及圖3之右側)之噴出側軸部15A。陽轉子11A之吸入側軸部14A可旋轉地由吸入側軸承16A支持，陽轉子11A之噴出側軸部15A可旋轉地由噴出側軸承17A支持。The male rotor 11A has a tooth portion 13A with a plurality of (4 in this embodiment) teeth extending in a spiral shape, and a suction side connected to the axial side of the tooth portion 13A (the left side in FIGS. 2 and 3) The shaft portion 14A and the ejection side shaft portion 15A connected to the other axial side of the tooth portion 13A (the right side in FIGS. 2 and 3). The suction side shaft portion 14A of the male rotor 11A is rotatably supported by the suction side bearing 16A, and the discharge side shaft portion 15A of the male rotor 11A is rotatably supported by the discharge side bearing 17A.

同樣地，陰轉子11B具有具備呈螺旋狀延伸之複數個(於本實施形態中為6個)齒之齒部13B、連接於齒部13B之軸向一側(圖2及圖3之左側)之吸入側軸部14B、及連接於齒部13B之軸向另一側(圖2及圖3之右側)之噴出側軸部15B。陰轉子11B之吸入側軸部14B可旋轉地由吸入側軸承16B支持，陰轉子11B之噴出側軸部15B可旋轉地由噴出側軸承17B支持。Similarly, the female rotor 11B has a tooth portion 13B having a plurality of (six in this embodiment) teeth extending in a spiral shape, and an axial side connected to the tooth portion 13B (left side in FIGS. 2 and 3) The suction side shaft portion 14B, and the discharge side shaft portion 15B connected to the other axial side of the tooth portion 13B (the right side in FIGS. 2 and 3). The suction side shaft portion 14B of the female rotor 11B is rotatably supported by the suction side bearing 16B, and the discharge side shaft portion 15B of the female rotor 11B is rotatably supported by the discharge side bearing 17B.

陽轉子11A之吸入側軸部14A貫通外殼12且連結於馬達1之旋轉軸。而且，陽轉子11A藉由馬達1之驅動而旋轉，藉由陽轉子11A之齒部13A與陰轉子11B之齒部13B之嚙合，陰轉子11B亦旋轉。The suction side shaft portion 14A of the male rotor 11A penetrates the housing 12 and is connected to the rotating shaft of the motor 1. Moreover, the male rotor 11A is driven by the motor 1 to rotate, and the female rotor 11B is also rotated by the meshing of the teeth 13A of the male rotor 11A and the teeth 13B of the female rotor 11B.

外殼12包含主外殼18、連結於主外殼18之軸向一側(圖2及圖3之左側)之吸入側外殼19、及連結於主外殼18之軸向另一側(圖2及圖3之右側)之噴出側外殼20。The housing 12 includes a main housing 18, a suction side housing 19 connected to one axial side of the main housing 18 (the left side in FIGS. 2 and 3), and an axial other side connected to the main housing 18 (FIG. 2 and 3 The right side of) the ejection side shell 20.

外殼12具有收納陽轉子11A之齒部13A及陰轉子11B之齒部13B，且於其等之齒槽形成陽轉子側之作動室及陰轉子側之作動室的內腔21。內腔21係分別收納陽轉子11A之齒部13A及陰轉子11B之齒部13B之2個圓筒狀之孔相互局部重疊而構成(參照圖5)。The housing 12 has a tooth portion 13A of the male rotor 11A and a tooth portion 13B of the female rotor 11B, and an inner cavity 21 is formed in the tooth slots of the male rotor side working chamber and the female rotor side working chamber. The inner cavity 21 is configured by partially accommodating the teeth 13A of the male rotor 11A and the teeth 13B of the female rotor 11B by partially overlapping two cylindrical holes (see FIG. 5).

外殼12具有位於較陽轉子11A之齒部13A及陰轉子11B之齒部13B更靠轉子徑向之外側(圖2之上側)的吸入口22、及以連接吸入口22與吸入行程之作動室之方式形成之吸入流路23。內腔21、吸入口22、及吸入流路23形成於主外殼18。The housing 12 has a suction port 22 located on the outer side (upper side of FIG. 2) in the radial direction of the rotor than the tooth portion 13A of the male rotor 11A and the tooth portion 13B of the female rotor 11B, and an operating chamber connecting the suction port 22 and the suction stroke The way to form the suction flow path 23. The inner cavity 21, the suction port 22, and the suction flow path 23 are formed in the main housing 18.

外殼12具有位於較陽轉子11A之齒部13A及陰轉子11B之齒部13B更靠轉子徑向之外側(圖2之下側)的噴出口24、及以連接噴出口與噴出行程之作動室之方式形成之噴出流路25。噴出口24形成於噴出側外殼20，噴出流路25形成於噴出側外殼20及主外殼18。The housing 12 has an ejection port 24 located on the outer side of the rotor radial direction (the lower side of FIG. 2) than the tooth portion 13A of the male rotor 11A and the tooth portion 13B of the female rotor 11B, and a working chamber connecting the ejection port and the ejection stroke The ejection flow path 25 is formed in a way. The discharge port 24 is formed in the discharge side housing 20, and the discharge flow path 25 is formed in the discharge side housing 20 and the main housing 18.

作動室自轉子軸向之一側向另一側移動，並且一面其容積發生變化。藉此，作動室依序進行經由吸入流路23自吸入口22吸入氣體之吸入行程、將氣體壓縮之壓縮行程、及經由噴出流路25向噴出口24噴出壓縮氣體之噴出行程。The actuating chamber moves from one side of the rotor shaft to the other side, and its volume changes on one side. Thereby, the actuating chamber sequentially performs a suction stroke of sucking gas from the suction port 22 through the suction flow path 23, a compression stroke of compressing the gas, and a discharge stroke of blowing compressed gas to the discharge port 24 through the discharge flow path 25.

吸入流路23對吸入行程之作動室沿轉子軸向連通。又，吸入流路23具有位於陽轉子11A側且較通過陽轉子11A之中心軸O1及陰轉子11B之中心軸O2之假想平面C更靠下游側(換言之，與吸入口22相反側)的陽轉子側吸入流路26A、及位於陰轉子11B側且較假想平面C更靠下游側之陰轉子側吸入流路26B(參照圖3及圖4)。The suction flow path 23 communicates with the actuation chamber of the suction stroke along the rotor axial direction. In addition, the suction flow path 23 has a male rotor 11A located on the side of the male rotor 11A and further downstream (in other words, the side opposite to the suction port 22) than a virtual plane C passing through the central axis O1 of the male rotor 11A and the central axis O2 of the female rotor 11B. The rotor side suction flow path 26A, and the female rotor side suction flow path 26B located on the female rotor 11B side and downstream of the virtual plane C (refer to FIGS. 3 and 4).

此處，作為本實施形態之較大之特徵，陽轉子側吸入流路26A之轉子徑向外側之流路壁27A(其中，用以將氣體封入至作動室之部分28除外)係以如下方式形成，即，至少於轉子軸向上之自陽轉子11A之齒部13A之吸入側端面至齒部13A的軸向節距P1(參照圖3)之一半之範圍內(作為具體例，圖3中係於P1×0.8＝R1之範圍，下述圖6中係於P1×0.5＝R1之範圍)，自轉子軸向觀察時成為與內腔21之壁相同之位置。再者，齒部之軸向節距係指轉子軸向上之齒頂之間隔。又，由於考慮到加工誤差等，故而流路壁27A自轉子軸向觀察時成為與內腔21之壁相同之位置係指以陽轉子11A之中心軸O1為基準的流路壁27A之半徑方向位置處於內腔21之壁之半徑方向位置之95%～105%的範圍。Here, as a major feature of the present embodiment, the flow path wall 27A (except for the part 28 used to seal the gas in the operating chamber) on the rotor radially outer side of the male rotor side suction flow path 26A is as follows It is formed, that is, within the range from the suction side end surface of the tooth 13A of the male rotor 11A to the tooth 13A in the axial pitch P1 (refer to FIG. 3) at least in the rotor axial direction (as a specific example, in FIG. 3) It is in the range of P1×0.8=R1, and in Fig. 6 below, it is in the range of P1×0.5=R1), it becomes the same position as the wall of the cavity 21 when viewed from the rotor axial direction. Furthermore, the axial pitch of the teeth refers to the distance between the tooth tips in the axial direction of the rotor. In addition, since processing errors and the like are taken into consideration, the position where the flow path wall 27A is the same as the wall of the cavity 21 when viewed from the rotor axial direction refers to the radial direction of the flow path wall 27A based on the central axis O1 of the male rotor 11A The position is in the range of 95%-105% of the radial position of the wall of the inner cavity 21.

又，陰轉子側吸入流路26B之轉子徑向外側之流路壁27B(其中，用以將氣體封入至作動室之部分28除外)係以如下方式形成，即，至少於轉子軸向上之自陰轉子11B之齒部13B之吸入側端面至齒部13B的軸向節距P2(其中，P1＝P2；參照圖3)之一半之範圍內(作為具體例，於圖3中，於P2×0.8＝R2之範圍，於下述圖6中，於P2×0.5＝R2之範圍)，自轉子軸向觀察時成為與內腔21之壁相同之位置。再者，由於考慮到加工誤差等，故而流路壁27B自轉子軸向觀察時成為與內腔21之壁相同之位置係指以陰轉子11B之中心軸O2為基準的流路壁27B之半徑方向位置處於內腔21之壁之半徑方向位置之95%～105%的範圍內。In addition, the flow path wall 27B (except for the part 28 used to seal the gas in the operating chamber) of the female rotor side suction flow path 26B on the radially outer side of the rotor is formed in such a way that at least the rotor axial direction is free from The suction side end surface of the tooth portion 13B of the female rotor 11B to the axial pitch P2 of the tooth portion 13B (where P1=P2; refer to Fig. 3) is within one half of the range (as a specific example, in Fig. 3, at P2× 0.8=R2 range, in the following Fig. 6, in P2×0.5=R2 range), it becomes the same position as the wall of the cavity 21 when viewed from the rotor axial direction. In addition, due to processing errors, etc., the position where the flow path wall 27B is the same as the wall of the cavity 21 when viewed from the rotor axial direction refers to the radius of the flow path wall 27B based on the central axis O2 of the female rotor 11B The directional position is within the range of 95%-105% of the radial position of the wall of the inner cavity 21.

於此種實施形態中，作為自陽轉子側吸入流路26A朝向陽轉子側作動室之氣體之流向之分量，不易產生轉子徑向之分量，因此，能夠減少壓力損失。又，作為自陰轉子側吸入流路26B朝向陰轉子側作動室之氣體之流向之分量，不易產生轉子徑向之分量，因此，能夠減少壓力損失。其結果為，能夠謀求吸氣流量之增大、或動力之減少。In this embodiment, as the component of the flow direction of the gas from the male rotor side suction flow path 26A toward the male rotor side operating chamber, it is difficult to generate a component in the radial direction of the rotor, so that the pressure loss can be reduced. In addition, as the component of the flow direction of the gas from the female rotor side suction flow path 26B toward the female rotor side operating chamber, it is difficult to generate a component in the radial direction of the rotor, so that the pressure loss can be reduced. As a result, it is possible to increase the intake air flow rate or decrease the power.

又，與流路壁27A、27B位於較內腔21之壁更靠轉子徑向之外側之情形相比，能夠抑制壓縮機本體2停止時油蓄積於陽轉子側吸入流路26A及陰轉子側吸入流路26B之下部。因此，亦能夠抑制因蓄積於陽轉子側吸入流路26A及陰轉子側吸入流路26B之下部之油之影響所造成的壓力損失。In addition, compared with the case where the flow path walls 27A and 27B are located on the outer side in the rotor radial direction than the wall of the inner cavity 21, it is possible to prevent oil from accumulating in the male rotor side suction flow path 26A and the female rotor side when the compressor body 2 is stopped. The lower part of the suction flow path 26B. Therefore, it is also possible to suppress the pressure loss due to the influence of the oil accumulated in the lower portion of the male rotor side suction flow path 26A and the female rotor side suction flow path 26B.

作為流路壁27A、27B自轉子軸向觀察時成為與內腔21之壁相同之位置之範圍，對設為至少轉子軸向上之自轉子之齒部之吸入側端面至齒部的軸向節距之一半之範圍的原因進行補充。就螺旋壓縮機之體積效率之觀點而言，必須考慮相對於陽轉子側作動室之轉子軸向剖面(換言之，於轉子軸向上延伸之剖面)之面積而言的陽轉子側吸入流路26A之轉子軸向剖面之面積、或者相對於陰轉子側作動室之轉子軸向剖面之面積而言的陰轉子側吸入流路26B之轉子軸向剖面之面積。陽轉子側作動室之轉子軸向剖面之面積例如由(陽轉子之齒之外徑與軸之外徑的差量)×軸向節距÷2表示，因此，陽轉子側吸入流路26A之轉子軸向剖面之面積至少確保(陽轉子之齒之外徑與軸之外徑的差量)×軸向節距÷2為佳。同樣地，陰轉子側作動室之轉子軸向剖面之面積例如由(陰轉子之齒之外徑與軸之外徑的差量)×軸向節距÷2表示，因此，陰轉子側吸入流路26B之轉子軸向剖面之面積至少確保(陰轉子之齒之外徑與軸之外徑的差量)×軸向節距÷2為佳。就此種觀點而言，若不至少於轉子軸向上之自轉子之齒部之吸入側端面至齒部的軸向節距之一半之範圍內，使陽轉子側吸入流路26A與陰轉子側吸入流路26B具有特徵，則無法充分獲得其效果。As the range where the flow path walls 27A and 27B are at the same position as the wall of the cavity 21 when viewed from the rotor axial direction, it is set at least in the rotor axial direction from the suction side end surface of the rotor tooth to the axial section of the tooth Supplement the reason for the one-half distance. From the viewpoint of volumetric efficiency of the screw compressor, it is necessary to consider the size of the suction flow path 26A on the male rotor side relative to the area of the rotor axial section of the male rotor side operating chamber (in other words, the section extending in the rotor axial direction) The area of the rotor axial section or the area of the rotor axial section of the female rotor side suction flow path 26B relative to the area of the rotor axial section of the female rotor side operating chamber. The area of the rotor axial section of the working chamber on the male rotor side is represented by, for example, (the difference between the outer diameter of the teeth of the male rotor and the outer diameter of the shaft) × the axial pitch ÷ 2. Therefore, the suction flow path 26A on the male rotor side The area of the axial section of the rotor should be at least (the difference between the outer diameter of the teeth of the male rotor and the outer diameter of the shaft)×axial pitch ÷ 2. Similarly, the area of the rotor axial section of the working chamber on the female rotor side is represented by (the difference between the outer diameter of the teeth of the female rotor and the outer diameter of the shaft) × axial pitch ÷ 2, therefore, the suction flow on the female rotor side The area of the axial section of the rotor of road 26B should be at least (the difference between the outer diameter of the tooth of the female rotor and the outer diameter of the shaft)×axial pitch ÷ 2. From this point of view, if it is not at least within the range from the suction side end surface of the tooth portion of the rotor to half of the axial pitch of the tooth portion in the rotor axial direction, the male rotor side suction flow path 26A and the female rotor side suction The flow path 26B has a characteristic, and its effect cannot be sufficiently obtained.

再者，於上述一實施形態中，陽轉子側吸入流路26A係以如下方式形成，即，沿著陽轉子11A之各半徑方向切斷而得之轉子軸向剖面即各流路剖面之面積V1(參照圖3)大於陽轉子側之各作動室的轉子徑向剖面(換言之，於轉子徑向上延伸之剖面)之面積S1(參照圖5)，陰轉子側吸入流路26B係以如下方式形成，即，沿著陰轉子11B之各半徑方向切斷而得之轉子軸向剖面即各流路剖面之面積V2(參照圖3)大於陰轉子側之各作動室的轉子徑向剖面之面積S2(參照圖5)，就此一情形為例而示出，但並不限於此。利用圖6對本發明之一變化例進行說明。圖6係表示本變化例中之壓縮機本體之構造之水平剖視圖。Furthermore, in the above-mentioned embodiment, the male rotor side suction flow path 26A is formed in such a way that the axial section of the rotor is cut along each radial direction of the male rotor 11A, that is, the area of each flow path section V1 (refer to Fig. 3) is larger than the area S1 (refer to Fig. 5) of the rotor radial cross section (in other words, the cross section extending in the rotor radial direction) of each working chamber on the male rotor side, and the female rotor side suction flow path 26B is as follows It is formed that the axial section of the rotor cut along each radial direction of the female rotor 11B, that is, the area V2 of each flow path section (refer to FIG. 3) is larger than the area of the radial section of the rotor of each working chamber on the female rotor side S2 (refer to FIG. 5) shows this situation as an example, but it is not limited to this. A modification example of the present invention will be explained using FIG. 6. Figure 6 is a horizontal cross-sectional view showing the structure of the compressor body in this modification.

於本變化例中，陽轉子側吸入流路26A係以如下方式形成，即，至少於陽轉子11A之旋轉方向上之自假想平面C至陽轉子11A之齒部13A的旋轉方向節距(於本實施形態中為90度)之範圍內，沿著陽轉子11A之各半徑方向切斷而得之轉子軸向剖面即各流路剖面之面積V1(參照圖6)與陽轉子側之各作動室的轉子徑向之剖面積S1(參照圖5)相同。再者，齒部之旋轉方向節距係指轉子旋轉方向上之相鄰之齒頂之間的角度。又，由於考慮到加工誤差等，故而面積V1與面積S1相同係指面積V1處於面積S1之95%～105%之範圍內。In this modified example, the male rotor side suction flow path 26A is formed in such a way that at least the rotation direction pitch of the male rotor 11A from the imaginary plane C to the tooth 13A of the male rotor 11A (at Within the range of 90 degrees in this embodiment), the axial section of the rotor obtained by cutting along the radial direction of the male rotor 11A, that is, the area V1 of each flow path section (refer to Fig. 6) and the actions on the side of the male rotor The cross-sectional area S1 (refer to FIG. 5) in the radial direction of the rotor of the chamber is the same. Furthermore, the pitch of the rotation direction of the teeth refers to the angle between adjacent tooth tips in the rotation direction of the rotor. In addition, due to the consideration of processing errors, etc., the area V1 and the area S1 are the same means that the area V1 is within the range of 95% to 105% of the area S1.

又，陰轉子側吸入流路26B係以如下方式形成，即，至少於陰轉子11B之旋轉方向上之自假想平面C至陰轉子11B之齒部13B的旋轉方向節距(於本實施形態中為45度)之範圍內，沿著陰轉子11B之各半徑方向切斷而得之轉子軸向剖面即各流路剖面之面積V2(參照圖6)與陰轉子側之各作動室的轉子徑向剖面之面積S2(參照圖5)相同。再者，由於考慮到加工誤差等，故而面積V2與面積S2相同係指面積V2處於面積S2之95%～105%之範圍內。In addition, the female rotor side suction flow path 26B is formed in such a way that at least the rotation direction pitch of the female rotor 11B from the imaginary plane C to the tooth 13B of the female rotor 11B (in this embodiment Within the range of 45 degrees), the axial section of the rotor obtained by cutting along the radial direction of the female rotor 11B, that is, the area V2 of each flow path section (refer to Figure 6) and the rotor diameter of each working chamber on the female rotor side The area S2 (refer to FIG. 5) of the cross section is the same. Furthermore, due to the consideration of processing errors, etc., the area V2 and the area S2 being the same means that the area V2 is within the range of 95%-105% of the area S2.

於此種變化例中，能夠抑制陽轉子側吸入流路26A內之流速之變化、或自陽轉子側吸入流路26A向陽轉子側作動室之流速之變化，從而進一步減少壓力損失。又，能夠抑制陰轉子側吸入流路26B內之流速之變化、或自陰轉子側吸入流路26B向陰轉子側作動室之流速之變化，從而進一步減少壓力損失。In this modified example, it is possible to suppress the change of the flow velocity in the male rotor side suction flow path 26A, or the change of the flow velocity from the male rotor side suction flow path 26A to the male rotor side working chamber, thereby further reducing the pressure loss. In addition, it is possible to suppress the change of the flow velocity in the female rotor side suction flow path 26B or the change of the flow velocity from the female rotor side suction flow path 26B to the female rotor side operating chamber, thereby further reducing the pressure loss.

再者，於上述一實施形態中，以陽轉子側吸入流路26A與陰轉子側吸入流路26B之兩者具有第1特徵(詳細而言，以至少於轉子軸向上之自齒部之吸入側端面至齒部之軸向節距的一半之範圍內，轉子徑向外側之流路壁自轉子軸向觀察時成為與內腔21之壁相同之位置之方式形成的特徵)之情形為例進行了說明，但並不限於此。即，亦可僅陽轉子側吸入流路26A與陰轉子側吸入流路26B中之一者具有第1特徵。Furthermore, in the above-mentioned embodiment, both the male rotor-side suction flow path 26A and the female rotor-side suction flow path 26B have the first feature (specifically, at least the suction from the teeth in the rotor axial direction In the range from the side end surface to half of the axial pitch of the tooth, the flow path wall on the radial outer side of the rotor is formed in the same position as the wall of the cavity 21 when viewed from the rotor axial direction. It is explained, but it is not limited to this. That is, only one of the male rotor side suction flow path 26A and the female rotor side suction flow path 26B may have the first feature.

又，於上述一變化例中，以陽轉子側吸入流路26A與陰轉子側吸入流路26B之兩者具有第1特徵及第2特徵(詳細而言，以至少於轉子旋轉方向上之自假想平面C至齒部之旋轉方向節距之範圍內，沿著轉子之各半徑方向切斷而得之轉子軸向剖面即各流路剖面之面積與各作動室的轉子徑向剖面之面積相同之方式形成的特徵)之情形為例進行了說明，但並不限於此。即，例如亦可僅陽轉子側吸入流路26A與陰轉子側吸入流路26B中之一者具有第1特徵及第2特徵。又，例如，亦可陽轉子側吸入流路26A與陰轉子側吸入流路26B之兩者具有第1特徵，僅陽轉子側吸入流路26A與陰轉子側吸入流路26B中之一者具有第2特徵。In addition, in the above-mentioned modification, both the male rotor side suction flow path 26A and the female rotor side suction flow path 26B have the first feature and the second feature (in detail, at least in the rotor rotation direction The axial section of the rotor cut from the imaginary plane C to the pitch of the tooth in the direction of rotation, cut along each radial direction of the rotor, that is, the area of each flow path section is the same as the area of the radial section of the rotor of each operating chamber The method of forming the feature) is described as an example, but it is not limited to this. That is, for example, only one of the male rotor side suction flow path 26A and the female rotor side suction flow path 26B may have the first feature and the second feature. Also, for example, both the male rotor side suction flow path 26A and the female rotor side suction flow path 26B may have the first feature, and only one of the male rotor side suction flow path 26A and the female rotor side suction flow path 26B may have The second feature.

又，作為本發明之應用對象，以供油式(詳細而言，向作動室內供給油之)螺旋壓縮機為例進行了說明，但並不限於此，亦可為供水式(詳細而言，向作動室內供給水之)螺旋壓縮機、或無供液式(詳細而言，不向作動室內供給油或水等液體之)螺旋壓縮機。In addition, as an application target of the present invention, an oil-supply type (in particular, oil is supplied to the operating chamber) screw compressor is described as an example, but it is not limited to this, and may be a water-supply type (in detail, A screw compressor that supplies water to the operating chamber or a non-liquid type (specifically, a screw compressor that does not supply liquid such as oil or water to the operating chamber).

1:馬達 2:壓縮機本體 3:氣液分離器 4:油配管 5:油冷卻器 6:濾油器 11A:陽轉子 11B:陰轉子 12:外殼 13A:齒部 13B:齒部 14A:陽轉子之吸入側軸部 14B:陰轉子之吸入側軸部 15A:陽轉子之噴出側軸部 15B:陰轉子之噴出側軸部 16A:吸入側軸承 16B:吸入側軸承 17A:噴出側軸承 17B:噴出側軸承 18:主外殼 19:吸入側外殼 20:噴出側外殼 21:內腔 22:吸入口 23:吸入流路 24:噴出口 25:噴出流路 26A:陽轉子側吸入流路 26B:陰轉子側吸入流路 27A:陽轉子側吸入流路之轉子徑向外側之流路壁 27B:陰轉子側吸入流路之轉子徑向外側之流路壁 1: motor 2: Compressor body 3: Gas-liquid separator 4: Oil piping 5: Oil cooler 6: oil filter 11A: male rotor 11B: Female rotor 12: Shell 13A: Teeth 13B: Teeth 14A: The suction side shaft of the male rotor 14B: The suction side shaft of the female rotor 15A: Shaft on the ejection side of the male rotor 15B: Shaft of the discharge side of the female rotor 16A: Suction side bearing 16B: Suction side bearing 17A: Discharge side bearing 17B: Discharge side bearing 18: main shell 19: Suction side housing 20: Outlet side shell 21: Internal cavity 22: suction port 23: Suction flow path 24: spout 25: Jet flow path 26A: suction flow path on the male rotor side 26B: suction flow path on the female rotor side 27A: The flow path wall outside the rotor radial direction of the suction flow path on the male rotor side 27B: The flow path wall outside the rotor radial direction of the suction flow path on the female rotor side

圖1係表示本發明之一實施形態中之供油式螺旋壓縮機之構成的概略圖。 圖2係表示本發明之一實施形態中之壓縮機本體之構造的鉛直剖視圖。 圖3係圖2之剖面III-III之水平剖視圖。 圖4係圖2之剖面IV-IV之鉛直剖視圖。 圖5係圖2之剖面V-V之鉛直剖視圖。 圖6係表示本發明之一變化例中之壓縮機本體之構造的水平剖視圖。Fig. 1 is a schematic diagram showing the structure of an oil-supply screw compressor in an embodiment of the present invention. Fig. 2 is a vertical sectional view showing the structure of a compressor body in an embodiment of the present invention. Fig. 3 is a horizontal sectional view of section III-III of Fig. 2; Fig. 4 is a vertical sectional view of the section IV-IV of Fig. 2; Fig. 5 is a vertical sectional view of the section V-V of Fig. 2; Fig. 6 is a horizontal sectional view showing the structure of the compressor body in a modification of the present invention.

2:壓縮機本體 2: Compressor body

11A:陽轉子 11A: male rotor

11B:陰轉子 11B: Female rotor

12:外殼 12: Shell

13A:齒部 13A: Teeth

13B:齒部 13B: Teeth

14A:陽轉子之吸入側軸部 14A: The suction side shaft of the male rotor

14B:陰轉子之吸入側軸部 14B: The suction side shaft of the female rotor

15A:陽轉子之噴出側軸部 15A: Shaft on the ejection side of the male rotor

15B:陰轉子之噴出側軸部 15B: Shaft of the discharge side of the female rotor

16A:吸入側軸承 16A: Suction side bearing

16B:吸入側軸承 16B: Suction side bearing

17A:噴出側軸承 17A: Discharge side bearing

17B:噴出側軸承 17B: Discharge side bearing

18:主外殼 18: main shell

19:吸入側外殼 19: Suction side housing

20:噴出側外殼 20: Outlet side shell

21:內腔 21: Internal cavity

26A:陽轉子側吸入流路 26A: suction flow path on the male rotor side

26B:陰轉子側吸入流路 26B: suction flow path on the female rotor side

27A:陽轉子側吸入流路之轉子徑向外側之流路壁 27A: The flow path wall outside the rotor radial direction of the suction flow path on the male rotor side

27B:陰轉子側吸入流路之轉子徑向外側之流路壁 27B: The flow path wall outside the rotor radial direction of the suction flow path on the female rotor side

Claims (6)

一種螺旋壓縮機，其具備具有齒部之陽轉子、具有與上述陽轉子之齒部嚙合之齒部之陰轉子、以及收容上述陽轉子及上述陰轉子之外殼，且 上述外殼具有：內腔，其收容上述陽轉子之齒部及上述陰轉子之齒部，且於其等之齒槽形成陽轉子側之作動室及陰轉子側之作動室；吸入口，其位於較上述陽轉子之齒部及上述陰轉子之齒部更靠轉子徑向之外側；及吸入流路，其係以連接上述吸入口與吸入行程之作動室之方式形成，且對上述吸入行程之作動室沿轉子軸向連通；而且 上述吸入流路具有位於上述陽轉子側且較通過上述陽轉子之中心軸及上述陰轉子之中心軸之假想平面更靠下游側的陽轉子側吸入流路、及位於上述陰轉子側且較上述假想平面更靠下游側之陰轉子側吸入流路；其特徵在於： 上述陽轉子側吸入流路係以如下方式形成，即，至少於轉子軸向上之自上述陽轉子之齒部之吸入側端面至上述齒部的軸向節距之一半之範圍內，轉子徑向外側之流路壁自轉子軸向觀察時成為與上述內腔之壁相同之位置。A screw compressor is provided with a male rotor having teeth, a female rotor having teeth meshing with the teeth of the male rotor, and a housing accommodating the male rotor and the female rotor, and The housing has: an inner cavity which accommodates the teeth of the male rotor and the teeth of the female rotor, and forms an operating chamber on the male rotor side and an operating chamber on the female rotor side in their cogging slots; a suction port, which is located The tooth part of the male rotor and the tooth part of the female rotor are more on the outer side of the rotor radial direction; and the suction flow path is formed by connecting the suction port and the working chamber of the suction stroke, and is related to the suction stroke The actuating chamber communicates along the axial direction of the rotor; and The suction flow path has a suction flow path on the male rotor side that is located on the male rotor side and is more downstream than the imaginary plane passing through the central axis of the male rotor and the central axis of the female rotor, and is located on the female rotor side and is more downstream than the above The imaginary plane is closer to the suction flow path on the downstream side of the female rotor; its characteristics are: The suction flow path on the male rotor side is formed in such a way that at least in the rotor axial direction from the suction side end surface of the tooth portion of the male rotor to half of the axial pitch of the tooth portion, the rotor radial direction The outer flow path wall becomes the same position as the wall of the inner cavity when viewed from the rotor axial direction. 如請求項1之螺旋壓縮機，其中 上述陽轉子側吸入流路係以如下方式形成，即，至少於上述陽轉子之旋轉方向上之自上述假想平面至上述陽轉子之齒部的旋轉方向節距之範圍內，沿著上述陽轉子之各半徑方向切斷而得之轉子軸向剖面即各流路剖面之面積與上述陽轉子側的各作動室之轉子徑向剖面之面積相同。Such as the screw compressor of claim 1, where The suction flow path on the male rotor side is formed in such a way that at least in the rotation direction of the male rotor from the imaginary plane to the rotation direction pitch of the teeth of the male rotor, along the male rotor The area of the axial cross section of the rotor obtained by cutting in each radial direction, that is, the cross section of each flow path, is the same as the area of the radial cross section of the rotor of each working chamber on the male rotor side. 如請求項1或2之螺旋壓縮機，其中 上述陰轉子側吸入流路係以如下方式形成，即，至少於轉子軸向上之自上述陰轉子之齒部之吸入側端面至上述齒部的軸向節距之一半之範圍內，轉子徑向外側之流路壁自轉子軸向觀察時成為與上述內腔之壁相同之位置。Such as the screw compressor of claim 1 or 2, where The female rotor side suction flow path is formed in such a way that at least in the rotor axial direction from the suction side end surface of the female rotor tooth portion to half of the axial pitch of the tooth portion, the rotor radial direction The outer flow path wall becomes the same position as the wall of the inner cavity when viewed from the rotor axial direction. 如請求項3之螺旋壓縮機，其中 上述陰轉子側吸入流路係以如下方式形成，即，至少於上述陰轉子之旋轉方向上之自上述假想平面至上述陰轉子之齒部的旋轉方向節距之範圍內，沿著上述陰轉子之各半徑方向切斷而得之轉子軸向剖面即各流路剖面之面積與上述陰轉子側的各作動室之轉子徑向剖面之面積相同。Such as the screw compressor of claim 3, where The suction flow path on the female rotor side is formed in such a way that at least in the rotation direction of the female rotor from the imaginary plane to the rotation direction pitch of the teeth of the female rotor, along the female rotor The area of the axial section of the rotor obtained by cutting in each radial direction, that is, the area of each flow path section is the same as the area of the radial section of the rotor of each working chamber on the female rotor side. 一種螺旋壓縮機，其具備具有齒部之陽轉子、具有與上述陽轉子之齒部嚙合之齒部之陰轉子、以及收容上述陽轉子及上述陰轉子之外殼，且 上述外殼具有：內腔，其收容上述陽轉子之齒部及上述陰轉子之齒部，且於其等之齒槽形成陽轉子側之作動室及陰轉子側之作動室；吸入口，其位於較上述陽轉子之齒部及上述陰轉子之齒部更靠轉子徑向之外側；及吸入流路，其係以連接上述吸入口與吸入行程之作動室之方式形成，且對上述吸入行程之作動室沿轉子軸向連通；而且 上述吸入流路具有位於上述陽轉子側且較通過上述陽轉子之中心軸及上述陰轉子之中心軸之假想平面更靠下游側的陽轉子側吸入流路、及位於上述陰轉子側且較上述假想平面更靠下游側之陰轉子側吸入流路；其特徵在於： 上述陰轉子側吸入流路係以如下方式形成，即，至少於轉子軸向上之自上述陰轉子之齒部之吸入側端面至上述齒部的軸向節距之一半之範圍內，轉子徑向外側之流路壁自轉子軸向觀察時成為與上述內腔之壁相同之位置。A screw compressor is provided with a male rotor having teeth, a female rotor having teeth meshing with the teeth of the male rotor, and a housing accommodating the male rotor and the female rotor, and The housing has: an inner cavity which accommodates the teeth of the male rotor and the teeth of the female rotor, and forms an operating chamber on the male rotor side and an operating chamber on the female rotor side in their cogging slots; a suction port, which is located The tooth part of the male rotor and the tooth part of the female rotor are more on the outer side of the rotor radial direction; and the suction flow path is formed by connecting the suction port and the working chamber of the suction stroke, and is related to the suction stroke The actuating chamber communicates along the axial direction of the rotor; and The suction flow path has a suction flow path on the male rotor side that is located on the male rotor side and is more downstream than the imaginary plane passing through the central axis of the male rotor and the central axis of the female rotor, and is located on the female rotor side and is more downstream than the above The imaginary plane is closer to the suction flow path on the downstream side of the female rotor; its characteristics are: The female rotor side suction flow path is formed in such a way that at least in the rotor axial direction from the suction side end surface of the female rotor tooth portion to half of the axial pitch of the tooth portion, the rotor radial direction The outer flow path wall becomes the same position as the wall of the inner cavity when viewed from the rotor axial direction. 如請求項5之螺旋壓縮機，其中 上述陰轉子側吸入流路係以如下方式形成，即，至少於上述陰轉子之旋轉方向上之自上述假想平面至上述陰轉子之齒部的旋轉方向節距之範圍內，沿著上述陰轉子之各半徑方向切斷而得之轉子軸向剖面即各流路剖面之面積與上述陰轉子側的各作動室之轉子徑向剖面之面積相同。Such as the screw compressor of claim 5, where The suction flow path on the female rotor side is formed in such a way that at least in the rotation direction of the female rotor from the imaginary plane to the rotation direction pitch of the teeth of the female rotor, along the female rotor The area of the axial section of the rotor obtained by cutting in each radial direction, that is, the area of each flow path section is the same as the area of the radial section of the rotor of each working chamber on the female rotor side.
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