CN202579187U

CN202579187U - Compressor with direct discharge end cover

Info

Publication number: CN202579187U
Application number: CN 201220149292
Authority: CN
Inventors: 黄幼玲
Original assignee: Emerson Climate Technologies Suzhou Co Ltd
Current assignee: Copeland Suzhou Co Ltd
Priority date: 2012-04-10
Filing date: 2012-04-10
Publication date: 2012-12-05
Anticipated expiration: 2022-04-10

Abstract

The utility model relates to a compressor with a direct discharge end cover, which comprises a shell; a low pressure side end cap connected to the first end of the housing; a scroll assembly disposed in the housing and compressing a working fluid; a rotating shaft located within the housing and drivingly engaged with the scroll assembly; a motor drivingly engaged with the rotating shaft; and a high pressure side end cap connected to the second end of the housing, the high pressure side end cap having an opening for discharging the working fluid, and a high pressure chamber sealing surface formed inside the high pressure side end cap, the opening being directly connected to the working fluid discharge fitting. According to the utility model discloses a compressor has saved the die cavity that is used for storage and discharge working fluid to the design has been simplified and manufacturing cost has been reduced.

Description

Compressor with direct discharging end cap

Technical field

The utility model relates to a kind of compressor, more specifically, relates to a kind of compressor with direct discharging end cap.

Background technique

Usually, particularly the compressor of scroll compressor is usually placed in the housing of sealing or semitight, and this housing limits the chamber of ccontaining working fluid.Dividing plate in the housing is divided into discharge pressure district and suction pressure district with chamber usually.In low voltage side was arranged, scroll component was positioned at the suction pressure district and is used for compression working fluid.Generally speaking; Scroll component is combined with a pair of intermeshing spiral scrollwork; In a pair of scrollwork one with respect to another around moving, thereby limit one or more motions chamber, the size in motion chamber is dwindled when the center discharge port is moved from outside inhalation port at it gradually.Usually provide the phase opposing connection of scroll component moving by electric notor.

The feasible compressed fluid that leaves the center discharge port of scroll component of dividing plate in the housing gets into the discharge pressure district in the housing, keeps the integrity between discharge pressure district and the suction pressure district simultaneously.This function of dividing plate is usually by realizing with dividing plate and the interactional Sealing of scroll element that limits the center discharge port.

The discharge pressure district of housing is typically provided with the exhaust fluid port, and the exhaust fluid port is communicated with the fluid circuit of refrigerating circuit or certain other types.In locking system; The end opposite utilization of fluid circuit is passed the suction fluid port that housing extends to the suction pressure district of housing and is linked to each other with the suction pressure district of housing; Therefore; Scroll compressor receives the working fluid from the suction pressure district of housing, and compression working fluid in the one or more mobile cavities that limited scroll component is discharged into the working fluid that compresses the discharge pressure district of compressor then.The working fluid of compression is directed passing discharge port through fluid circuit, and turns back to the suction pressure district of housing via inhalation port.

In the prior art, the discharge pressure district of scroll compressor is made up of two parts usually, i.e. dividing plate (claim again noise reduction lid) and high pressure side end cap, and the effect of dividing plate is the sealing surface that middle pressure chamber and hyperbaric chamber is separated and be provided for forming the middle pressure chamber of deciding vortex.The effect of high pressure side end cap is for pressurized gas provide die cavity, and provides as the outlet valve of working fluid outlet fitting or the mounting interface of outlet pipe.The dividing plate of compressor and high pressure side end cap are as independently parts formation; Cause the overall construction design of compressor complicated; It is complicated that manufacturing process correspondingly becomes, and makes manufacture cost very high thus, and because compressor has hyperbaric chamber; Therefore make the overall volume of compressor become big, thereby cause it in installation and working procedure, to take bigger space.

In order to solve the problems referred to above that exist in the existing technology, the utility model proposes a kind of new design of simple in structure, compressor that volume reduces.

The model utility content

A purpose of the utility model provides a kind of compressor, and this compressor has direct discharging end cap, thereby can the high-pressure liquid in the compressor directly be discharged into the outside of compressor, has therefore saved the die cavity that is used to store and discharge high-pressure liquid.

Another purpose of the utility model provides a kind of compressor; Wherein, To be used for forming middle densification front cover of pressing the chamber and the assembly department that is used for the working fluid outlet fitting and being arranged on same parts with the vortex of deciding of scroll component; The direct discharge end that promptly is arranged on compressor covers, and in the utility model, is arranged on the end cap of high pressure side.

Also purpose of the utility model provides a kind of compressor; Wherein, Can be according to the concrete user mode and the space utilization condition of work system; The installation surface that is used for the fluid outlet fitting of assembly department is arranged perpendicular to the hyperbaric chamber sealing surface of the inboard of high pressure side end cap, perhaps it is arranged to be parallel to the hyperbaric chamber sealing surface in the inboard of high pressure side end cap.

One or more to achieve these goals, an aspect according to the utility model provides a kind of compressor, and it comprises: housing; The low voltage side end cap, this low voltage side end cap is connected on the first end of housing; Scroll component, this scroll component is arranged in the housing and to working fluid and compresses; Be positioned at the running shaft of housing, this running shaft engages with scroll component drivingly; The motor that comprises rotor and stator, motor engages with running shaft drivingly; It is characterized in that; Compressor also comprises the high pressure side end cap on the second end that is connected to housing; This high pressure side end cap has the opening that is used to discharge working fluid, and the inboard of end cap is formed with the hyperbaric chamber sealing surface in the high pressure side, and above-mentioned opening directly is connected with the working fluid outlet fitting.

Beneficial effect according to the compressor that comprises above characteristic is; In this scheme, saved the die cavity that is used to store and discharge pressurized working fluid; Substitute the combination of dividing plate or noise reduction lid and high side end cap by high pressure side end cap, thereby simplified the design proposal of compressor, and reduced the volume of compressor as single parts; So can reduce manufacture cost and practice thrift shared space in the using process, therefore the technological scheme according to present embodiment has bigger application area.

According to the another one embodiment of the utility model, during also being formed with, the inboard of high pressure side end cap presses chamber face and middle pressure chamber sealing surface.Preferably, the hyperbaric chamber sealing surface forms around the periphery of above-mentioned opening, and middle pressure chamber face forms around the periphery of hyperbaric chamber sealing surface, and middle pressure chamber sealing surface forms around the periphery of middle pressure chamber face.The hyperbaric chamber of pressurized working fluid can be formed for discharging through high pressure side end cap, and middle pressure chamber that scroll component is worked better can be formed for this structure.

In a preferred embodiment, the high pressure side end cap has the assembly department that is used for installment work fluid outlet fitting.Through this preferred embodiment, can the working fluid outlet fitting directly be installed on the end cap of high pressure side, thereby thus working fluid directly be disposed to cooling line.

In another embodiment according to the utility model, the outer surface that is used for assembly department end cap from the high pressure side of installment work fluid outlet fitting is outwards given prominence to, and has the installation surface that is used for the working fluid outlet fitting.

In another embodiment according to the utility model, above-mentioned installation surface is parallel with the hyperbaric chamber sealing surface.In addition, above-mentioned assembly department is arranged on through strengthening rib on the outer surface of high pressure side end cap, can assembly department be arranged on the end cap of high pressure side more securely thus.

In the also embodiment according to the utility model, above-mentioned installation surface is vertical with the hyperbaric chamber sealing surface.

In above-described embodiment's technological scheme; Can be according to the concrete user mode and the space utilization condition of work system; Optionally the installation surface that is used for the fluid outlet fitting of assembly department is arranged perpendicular to the hyperbaric chamber sealing surface of the inboard of high pressure side end cap; Perhaps it is arranged to be parallel to the hyperbaric chamber sealing surface in the inboard of high pressure side end cap, so that the installation of compressor and use.

In another embodiment, in the end cap of high pressure side, be provided with the elongated orifices of radially extending, and this elongated orifices extends to the above-mentioned opening that is used to discharge working fluid according to the utility model.This elongated orifices can be used for the temperature of the ccontaining working fluid that is used to detect the opening that flows through the high pressure side end cap and/or the temperature transducer and/or the pressure transducer of pressure.

Description of drawings

Through following description with reference to accompanying drawing, can more be expressly understood one or several embodiment's of the utility model feature and advantage, wherein:

Fig. 1 is the overall perspective that is provided with according to the compressor of the high pressure side end cap of the utility model.

Fig. 2 is the sectional view of compressor shown in Figure 1.

Fig. 3 is near the partial enlarged drawing of high pressure side end cap of compressor shown in Figure 2.

Fig. 4 A is the inside perspective view according to the high pressure side end cap that is used for compressor of the utility model.

Fig. 4 B is the outer side perspective view according to the high pressure side end cap that is used for compressor of the utility model.

Fig. 5 A is the inner side plane figure according to the high pressure side end cap that is used for compressor of the utility model.

Fig. 5 B is the sectional view along the line 5B-5B among Fig. 5 A.

Fig. 6 is the overall perspective that is provided with according to the compressor of another embodiment's of the utility model high pressure side end cap.

Fig. 7 A is the inside perspective view according to another embodiment's of the utility model the high pressure side end cap that is used for compressor.

Fig. 7 B is the outer side perspective view according to another embodiment's of the utility model the high pressure side end cap that is used for compressor.

Fig. 8 A is the inner side plane figure according to another embodiment's of the utility model the high pressure side end cap that is used for compressor.

Fig. 8 B is the sectional view along the line 8B-8B among Fig. 8 A.

Embodiment

Following description related to the preferred embodiment only is exemplary, rather than to the restriction of the utility model and application or usage.

As shown in Figure 1, the compressor 1 according to the utility model is shown.Compressor 1 has housing 2, and housing 2 has relative first end 21 and the second end 22, and low voltage side end cap 3 is connected on the first end 21, and high pressure side end cap 4 is connected on the second end 22.Low voltage side end cap 3 can be connected on the housing 2 through the fastening piece of bolt or other type well known in the art with high pressure side end cap 4.Housing 2, low voltage side end cap 3 and the high pressure side end cap 4 common chambers that limit ccontaining working fluid.Working-fluid intaking accessory 5 is arranged on the housing 2, is used in the fluid chamber of compressor 1 inside, supplying with working fluid, and heat exchanger 7 and corresponding heat exchange pipe thereof are arranged on the side of the second end 22 of housing 2.High pressure side end cap 4 is provided with working fluid outlet fitting 6.

As shown in Figure 2, housing 2 is single one-piece element, and as nonrestrictive example, housing 2 can be a cast component.Housing 2 comprises main bearing seat 23, in main bearing seat 23, has precision machined central through bore 231, and through hole 231 is configured to hold axle sleeve or bearing 232, and with the intermediate portion 85 of supporting rotating shaft 8, bearing 232 is press fit in the through hole 231.

In the set inside of housing 2 scroll component 10 as compressing mechanism arranged, be used to that scroll component 10 provides the motor 9 of power and the running shaft 8 of transmission of power to the scroll component 10 of motor 9.What scroll component 10 comprised that the relative movement through each other forms pressurized working fluid decides vortex 101 and moving vortex 102.Motor 9 comprises the stator 92 that is press-fit in the housing 2 and is press-fit to the rotor 91 on the running shaft 8.Running shaft 8 has eccentric crank pin 83 at one end thereof 81 places, and eccentric crank pin 83 is installed in the hub portion 106 of moving vortex 102 through axle sleeve, is used to drive moving vortex 102 motions.The intermediate portion 85 of running shaft 8 is bearing in the bearing 232 in the through hole 231 of main bearing seat 23 rotatably.Another end 82 of running shaft 8 is bearing in the bearing 32 in the hole 31 of low voltage side end cap 3 rotatably.

As shown in Figure 2; Low voltage side end cap 3 comprises lubricant entry accessory 34 and

lubricant passageway

35 and 36; Lubricant passageway 35 is communicated to the periphery of bearing 32; Thereby for bearing 32 oiling agent is provided, lubricant passageway 36 is communicated with running shaft 8 inner lubricant passageways 86, is used to running shaft 8 oiling agent is provided.

Running shaft 8 is driven by the electric motor 9 that comprises rotor 91 and stator 92 rotatably.First counterweight 87 joins on the rotor 91 at 82 places, end of contiguous running shaft 8, and second counterweight 84 joins on the running shaft 8 between end 81 and intermediate portion 85.

Continuation is with reference to figure 2, also is provided with in the inside of housing 2 to be used to the thrust plate 11 that moving vortex 102 provides the thrust supporting.Thrust plate 11 is arranged in the housing 2 of compressor 1 against the processing shoulder 24 between the second end 22 and the main bearing seat 23.As nonrestrictive example, thrust plate 11 can be fastened on the processing shoulder 24 in the housing 2 through a plurality of fastening pieces.Vortex 102 is moved in supporting to ground with processing shoulder 24 relative side shafts of thrust plate 11.

Moving vortex 102 comprises first spiral wraps 104; Engaging with thrust plate 11 of moving vortex 102 with first spiral wraps, 104 facing surfaces, and moving vortex 102 comprises the cylindrical hub portion 106 of stretching out and extending through thrust plate 11 from the mating face of itself and thrust plate 11.Eccentric crank pin 83 rotatably is arranged in the cylindrical hub portion 106 through axle sleeve, thereby makes running shaft 8 drive moving vortex 102.

Oldham coupling 136 is arranged between moving vortex 102 and the thrust plate 11.Oldham coupling 136 utilizes key to be connected to moving vortex 102 and to decide on the vortex 101, in case the rotatablely moving of fastening vortex 101.

With reference now to Fig. 2 and Fig. 3,, to decide vortex 101 and comprise second spiral wraps 103, it is positioned to and moves first spiral wraps, 104 engagements of vortex 102.Decide the discharge passage 107 that vortex 101 has the centered that is limited base portion 105.Integrated type escape cock 109 can be set in discharge passage 107.Escape cock 109 is depicted as normally close valve.During compressor operating, according to the design of pressure in the discharge passage 107 and escape cock 109, escape cock 109 can be shown in an open position or closed position.When compressor 1 quit work, escape cock 109 cut out.

As shown in Fig. 2 to Fig. 4 B, the end joined of high pressure side end cap 4 and the second end 22 of housing 2, and be fastened on the end face of the second end 22 through the fixed block of the through hole on the outer periphery of passing high pressure side end cap 4 41.As nonrestrictive example, packing ring or other seal arrangement can between the end face of high pressure side end cap 4 and the second end 22, be arranged, so that the tight of the liquid between them to be provided.Detailed view at high pressure side end cap 4 shown in Fig. 4 A and Fig. 4 B.Fig. 4 A is the perspective view that the inboard of high pressure side end cap 4 is shown, and Fig. 4 B is the perspective view that the outside of high pressure side end cap 4 is shown, and Fig. 5 A is the planimetric map that the inside structure of high pressure side end cap 4 is shown, and Fig. 5 B is the sectional view of 5B-5B along the line.

Shown in Fig. 4 A, high pressure side end cap 4 has the opening 40 that is communicated with the discharge passage of deciding vortex 101 107 through the escape cock of opening 109.Middle pressure chamber face 48 that the inboard of high pressure side end cap 4 comprises the hyperbaric chamber sealing surface 47 that forms around the periphery of opening 40, form around the periphery of hyperbaric chamber sealing surface 47 and the middle pressure chamber sealing surface 49 that forms around the periphery of middle pressure chamber face 48.Be formed for making scroll component 10 to work better at middle pressure chamber face 48 and in the middle pressure chamber of deciding to constitute between the vortex 101 towards moving the back pressure that vortex 102 bias voltages are decided vortex 101.In addition, in opening 40, form hyperbaric chamber, be used for pressurized working fluid is discharged to the outside of compressor.

Shown in Fig. 4 B; High pressure side end cap 4 comprises from the outwards outstanding assembly department that is used for fluid outlet fitting 6 43 of its outer surface 42; Assembly department 43 is provided with the installation surface 44 that is used to install fluid outlet fitting 6, and this installation surface 44 is arranged to be parallel to hyperbaric chamber sealing surface 47 and middle pressure chamber sealing surface 49.On installation surface 44, be furnished with mounting hole 45, be used for the fixed block of ccontaining fixed discharge accessory 6, for example bolt, screw or the like.In addition; According to the utility model preferred embodiment; Between the outer surface 42 of assembly department that is used for fluid outlet fitting 6 43 and high pressure side end cap 4, also be provided with strengthening rib 46, be used to reinforce being connected between the outer surface 42 of the assembly department 43 that is used for fluid outlet fitting 6 and high pressure side end cap 4.

Shown in Fig. 5 A; Form with planimetric map is clearly shown that opening 40, hyperbaric chamber sealing surface 47, middle pressure chamber face 48 and middle pressure chamber sealing surface 49 on the inner side surface that is formed on high pressure side end cap 4 more; Wherein, hyperbaric chamber sealing surface 47 is illustrated by the annular portion with hatching respectively with middle pressure chamber sealing surface 49.With reference to figure 5B; The inside of end cap 4 also is provided with the elongated orifices that is used for ccontaining sensor 401 that radially extends to opening 40 in the high pressure side, and sensor is such as being the temperature of the exhaust fluid that is used to detect opening 40 places and/or the temperature transducer and/or the pressure transducer of pressure.

Shown in Fig. 6 to Fig. 8 B, second embodiment according to the utility model is shown.In this embodiment, the set-up mode of the assembly department that is used for fluid outlet fitting 6 on the end cap of high pressure side was different with above-mentioned first embodiment, this embodiment's other structure and first embodiment were identical, did not do at this about identical structure characteristic and gave unnecessary details.

Fig. 6 illustrates the perspective view that is provided with according to the compressor of second embodiment's of the utility model high pressure side end cap 4 '; Fig. 7 A is the inside perspective view according to second embodiment's of the utility model high pressure side end cap 4 ', and Fig. 7 B is the outer side perspective view according to second embodiment's of the utility model high pressure side end cap 4 '.In this embodiment, high pressure side end cap 4 ' has the opening 40 ' that is communicated with the discharge passage of deciding vortex 101 107 through the escape cock of opening 109 equally.Middle pressure chamber face 48 ' that the inboard of high pressure side end cap 4 ' comprises the hyperbaric chamber sealing surface 47 ' that is provided with around the periphery of opening 40 ' too, be provided with around the periphery of hyperbaric chamber sealing surface 47 ' and the middle pressure chamber sealing surface 49 ' that is provided with around the periphery of middle pressure chamber face 48 '.The outer surface 42 ' that is used for assembly department 43 ' end cap 4 ' from the high pressure side of fluid outlet fitting 6 is outwards given prominence to, and the installation surface 44 ' that engages with fluid outlet fitting 6 vertically is provided with middle pressure chamber sealing surface 49 ' with high pressure side end cap 4 ' inboard hyperbaric chamber sealing surface 47 '.Likewise, on installation surface 44 ', be furnished with mounting hole 45 ', be used for the fixed block of ccontaining installation outlet fitting 6, for example bolt, screw etc.

Shown in Fig. 8 A and 8B, the inner side plane figure of high pressure side end cap 4 ' and the sectional view of 8B-8B along the line are shown respectively.In Fig. 8 A, be clearly shown that the opening 40 ', hyperbaric chamber sealing surface 47 ', pressure chamber face 48 ' and pressure chamber sealing surface 49 ' of the inboard that is arranged in high pressure side end cap 4 ' more with the form of planimetric map.Shown in Fig. 8 B; High pressure side end cap 4 ' is provided with the elongated orifices 401 ' that is used for ccontaining sensor that radially extends to opening 40 ', and said sensor is such as being the temperature that is used to detect the exhaust fluid that opening 40 ' locates and/or the temperature transducer and/or the pressure transducer of pressure.Opening 40 ' in the high pressure side end cap 4 ' is arranged to orthogonal two sections, and the two ends of opening 40 ' are communicated with escape cock 109 and working fluid outlet fitting 6 respectively.Though opening 40 ' is arranged to orthogonal two sections in the present embodiment, it may occur to persons skilled in the art that other set-up mode, as long as meeting, installs and usage requirement the entrance and exit of opening 40 '.

In first embodiment of the utility model; At compressor 1 duration of work; Working fluid flows in the chamber that is formed between first spiral wraps 104 and second spiral wraps 103 through the inlet that moves vortex 102 bottoms from the suction chamber near low voltage side end cap 3, and the opening 40 in the discharge passage 107 of flowing through then, escape cock 109 and the high pressure side end cap 4 directly is discharged to the outsides of compressor 1 through working fluid outlet fitting 6.Equally, for second embodiment of the utility model, working fluid is after escape cock 109 is discharged, and the opening 40 ' through the bending in the high pressure side end cap 4 ' flows to working fluid outlet fitting 6, and discharges the outside of compressor 1 thus.

In above-mentioned two embodiments; The assembly department 43 or 43 ' that is used for installment work fluid outlet fitting 6 can form with high pressure side end cap 4 or 4 ', perhaps can be individually formed and be fixed on high pressure side end cap 4 or 4 ' through fixing device known in the art or fixing means.Can adopt the fluid outlet fitting installation surface that is provided with perpendicular to the hyperbaric chamber sealing surface in the inboard of high pressure side end cap according to the concrete user mode and the space utilization condition of work system, the fluid outlet fitting installation surface that perhaps adopts the hyperbaric chamber sealing surface in the inboard that is parallel to the high pressure side end cap to be provided with.

In above-mentioned two embodiments of the utility model, high-pressure liquid all directly discharges through high pressure side end cap 4 or 4 ', and need not through in the existing technology general adopt pass through the form that the high pressure die cavity discharges.The form of discharging through the high pressure die cavity makes become complicated, manufacture cost of the design of compressor improve, and makes the volume of compressor become huger, thereby in use takies bigger space.Adopt the described compressor of the utility model, pressurized working fluid can directly discharge through the high pressure side end cap, thereby has saved the high pressure die cavity that is specifically designed to that depositing knocks off side by side and does fluid, has therefore simplified the design of compressor, has reduced the volume of compressor.Therefore, the high pressure side that has of the utility model is directly discharged the compressor of end cap and has been saved manufacture cost and practiced thrift space shared in the using process.

Although the utility model illustrates on horizontal-type compressor, wherein motor is positioned at housing, and the utility model also can use in the opening driven compressor, and wherein, motor is positioned at the outside of housing and drives the axle that passes housing.

Though above the utility model is described in detail,, clearly the utility model can have multiple variation and remodeling.Under the situation of spirit that does not break away from the utility model and scope, various variations that it will be apparent to those skilled in the art that and remodeling all fall in the scope of claim of the utility model.

Claims

1. a compressor (1) comprising:

Housing (2);

Low voltage side end cap (3), said low voltage side end cap (3) are connected on the first end (21) of said housing (2);

Scroll component (10), said scroll component (10) are arranged in the said housing (2) and to working fluid and compress;

Be positioned at the running shaft (8) of said housing (2), said running shaft (8) engages with said scroll component (10) drivingly; And

The motor (9) that comprises rotor (91) and stator (92), said motor (9) engages with said running shaft (8) drivingly;

It is characterized in that; Said compressor (1) also comprises the high pressure side end cap (4,4 ') on the second end (22) that is connected to said housing (2); Said high pressure side end cap (4,4 ') has the opening (40,40 ') that is used to discharge working fluid; And the inboard of end cap (4,4 ') is formed with hyperbaric chamber sealing surface (47,47 ') in said high pressure side, and said opening (40,40 ') directly is connected with working fluid outlet fitting (6).

2. compressor according to claim 1 wherein, is pressed chamber face (48,48 ') and middle pressure chamber sealing surface (49,49 ') during the inboard of said high pressure side end cap (4,4 ') also is formed with.

3. compressor according to claim 2; Wherein, Said hyperbaric chamber sealing surface (47,47 ') forms around the periphery of said opening (40,40 '); The periphery of pressing chamber face (48,48 ') to center on said hyperbaric chamber sealing surface (47,47 ') in said forms, and the said middle chamber sealing surface (49,49 ') of pressing is around said middle periphery formation of pressing chamber face (48,48 ').

4. compressor according to claim 1, wherein, said high pressure side end cap (4,4 ') has the assembly department (43,43 ') that is used to install said working fluid outlet fitting (6).

5. compressor according to claim 4; Wherein, The outer surface (42,42 ') of said assembly department (43,43 ') end cap (4,4 ') from said high pressure side is outwards outstanding, and has the installation surface (44,44 ') that is used for said working fluid outlet fitting (6).

6. compressor according to claim 5, wherein, said installation surface (44) is parallel with said hyperbaric chamber sealing surface (47).

7. compressor according to claim 6, wherein, said assembly department (43) is arranged on the outer surface (42) of said high pressure side end cap (4) through strengthening rib (46).

8. compressor according to claim 5, wherein, said installation surface (44 ') is vertical with said hyperbaric chamber sealing surface (47 ').

9. according to each the described compressor in the aforementioned claim, wherein, be provided with the elongated orifices (401,401 ') of radially extending in the said high pressure side end cap (4,4 ').

10. compressor according to claim 9, wherein, said elongated orifices (401,401 ') extends to said opening (40,40 ').