CN106050666B - Positive displacement compressor - Google Patents

Abstract

The present invention provides a kind of positive displacement compressor, can reduce oil content with simple structure.The fixation top wall (2w) of the upper surface (2t) of connection demarcation strip (200) and fixed eddy plate (2) is set, space (120) and surrounding spacer body peripheral space (130) in the spacer body impaled using the spacer body being made of demarcation strip (200) and fixed top wall (2w) are set, make the bottom (2w2) of the fixation top wall trench (2w1) of space (120) and spacer body peripheral space (130) in connection spacer body with out of spacer body space (120) continuously decline towards spacer body peripheral space (130).

Description

Positive displacement compressor

Technical field

The present invention relates to positive displacement compressor.

Background technology

In common positive displacement compressor, in order to improve the leakproofness of the discharge chambe formed by compression unit, supplied to discharge chambe Oil supply.The oil is discharged together with working fluid out of compression unit carry out machine.If make this carry out the working fluid of discharge in machine to protect Hold and discharged as former state outside progress machine, then the oil in compressor is reduced and the worry of the deficient oil supply of oriented discharge chambe progress.And And in most cases, the oil in compressor also takes on the effect using bearing as the lubricant of the sliding part of representative, so as to also there is profit Sliding undesirable worry.In addition, for the equipment (for example, heat exchanger) for the working fluid discharged outside using the machine that carried out, In most cases, the oil contained by working fluid becomes the reason for causing performance to reduce.Therefore, it is required in itself to reduce oil content 's.In conclusion it is equipped with the path that the working fluid discharged outside carry out machine is discharged to out of carry out machine by working fluid Mist of oil separates and reduces the oily separating mechanism of oil content.

Positive displacement compressor make the working fluid that have compressed temporarily to compression unit upper side the chamber interior space (it is following, Referred to as compress upper space) to discharge and discharged from compression upper space to outside machine, the positive displacement compressor is such as in patent document 1 Disclosed in screw compressor it is such, at cavity top cover portion (housing upper) with opposed compression unit upper surface (on fixed eddy plate Surface) between space that is, compression upper space (discharge room) be equipped with the separation that is covered to discharge unit in machine (tap) Cover (head cover).As a result, the working fluid (refrigerant gas) that discharge unit is discharged in slave is collided with septation cover (head cover), oil is attached In the lower surface of septation cover (the inside), so as to fulfill the oil separation of working fluid, and then reduce oil content.

Prior art literature

Patent document 1：Japanese Unexamined Patent Publication 5-195971 publications

In patent document 1, septation cover lower surface (top is attached to by using what the oil of septation cover (head cover) was separated and produced Lid the inside) oil reach oil storage portion to return oil circuit footpath as follows.That is, septation cover lower surface (inside head cover) and pressure in the bottom The horizontal compression unit upper surface (upper surface of fixed eddy plate) in contracting portion by separate barrel (support foot) connect, this results in from Oil circuit footpath is returned towards compression unit upper surface (upper surface of fixed eddy plate) in septation cover lower surface (in head cover).Moreover, afterwards, pressing Road (gap) and motor, compression chamber under contracting portion upper surface open and the oil stream of connection compression upper space and compression lower space Room (housing) inner surface forms and returns oil circuit footpath.

However, in patent document 1, due to returning oil circuit footpath close to oil and not having working fluid after road (gap) under oil stream Mainstream so that the worry of water atomization is low again.On the other hand, along separate barrel (support foot) and to compression unit upper surface (Gu The upper surface of static vortex disk) oil that flows down reaches compression unit upper surface (upper surface of fixed eddy plate) on road (gap) under oil stream and opens , there is oil in returning in oil circuit footpath between oral area, and oil is in adjacent and adjacent with the mainstream of the working fluid position of oil phase On horizontal plane, so as to generate delay.In the case where not implementing special countermeasure, if oil is adjacent with the mainstream of working fluid Time is elongated, then water atomization increase again, and the amount increase being involved in again in working fluid.In the conventional art of patent document 1, Special countermeasure is not carried out, and the oily time adjacent with the mainstream of working fluid is elongated, so that having can not be come with higher level Realize that oil content reduces the problem of such.Especially, in higher suction pressure or higher motor rotation speed that is, big matter Measure the operating condition of flow, to compressing under the more operating condition of indoor fuel delivery, the increase trend of oil content becomes strong.

The content of the invention

The present invention solves upper above-mentioned conventional problem, and its purpose is to provide can reduce oil content with simple structure Positive displacement compressor.

It is a feature of the present invention that possess：Compression unit, it possesses the work of the low pressure to being externally introduced by suction passage The discharge chambe being compressed as fluid；Compression chamber, it compresses upper space, above-mentioned to be formed in the top of above-mentioned compression unit The mode of the compression lower space formed below of compression unit surrounds above-mentioned compression unit；Discharge unit in machine, it makes by above-mentioned Working fluid after compression unit boosting is from the compression unit upper surface of the upper surface as the compression unit upward and to above-mentioned pressure Contracting upper space carries out discharge in machine；The outer discharge unit of machine, it connects above-mentioned compression upper space with said external, and makes boosting Working fluid afterwards discharged outside machine；Oil storage portion, it is at least arranged on above-mentioned compression lower space；Discharge chambe oil passage, its to Above-mentioned discharge chambe supplies the oil in above-mentioned oil storage portion；And spacer body, it is made of septation cover and separation barrel, septation cover covering The top of discharge unit in above-mentioned machine, the separation barrel connect above-mentioned septation cover and above-mentioned compression unit upper surface and to being arranged in above-mentioned machine The outlet for going out portion is surrounded, and above-mentioned spacer body possesses：As space in the spacer body of the inner space of the spacer body；As The spacer body peripheral space in the outer circumferential side space of above-mentioned separation barrel；And make space and spacer body periphery in the spacer body empty Between multiple separation opening portions for connecting, the bottom of at least one above-mentioned separation opening portion is with the space direction out of above-mentioned spacer body Above-mentioned spacer body peripheral space and continuously or periodically decline.

The effect of invention is as follows.

According to the present invention, it can be achieved that the positive displacement compressor of oil content can be reduced with simple structure.

Brief description of the drawings

Fig. 1 is the longitudinal section of the screw compressor of the 1st embodiment.

Fig. 2 is the amplification longitudinal section (S of Fig. 1 near the compression upper space of the screw compressor of the 1st embodiment Portion, the J-J sections of Fig. 3).

Fig. 3 is the sectional elevation (Section A-A of Fig. 2) of the compression unit of the screw compressor of the 1st embodiment.

Fig. 4 A are the vertical cutaway view Amplified image (M of Fig. 2 separated near opening portion of the screw compressor of the 1st embodiment Portion).

Fig. 4 B are the vertical cutaway view Amplified images separated near opening portion of the screw compressor of the 2nd embodiment.

Fig. 4 C are the vertical cutaway view Amplified images separated near opening portion of the screw compressor of the 3rd embodiment.

Fig. 4 D are the vertical cutaway view Amplified images separated near opening portion of the screw compressor of the 4th embodiment.

Fig. 4 E are the vertical cutaway view Amplified images separated near opening portion of the screw compressor of the 5th embodiment.

Fig. 4 F are the vertical cutaway view Amplified images separated near opening portion of the screw compressor of the 6th embodiment.

Fig. 4 G are the vertical cutaway view Amplified images separated near opening portion of the screw compressor of the 7th embodiment.

Fig. 5 is the sectional elevation (Section A-A of Fig. 2) of the compression unit of the screw compressor of the 8th embodiment.

Fig. 6 is the amplification longitudinal section (the P portions of Fig. 2) of the separation open bottom of the screw compressor of the 9th embodiment.

Fig. 7 is the amplification longitudinal section near the compression upper space of the screw compressor of the 10th embodiment.

In figure：

1-screw compressor, 2-fixed eddy plate, 2d-discharge unit (discharge unit in machine), 2d1-outlet, 2e-bypass Hole, 2g-counterbalance valve flow path, 2q-fixed station plate portion, 2t-upper surface (compression unit upper surface), 2w-fixation top wall (separate Barrel), 2w1-fixation top wall trench (separation opening portion), 2w4-outer circumferential side opening portion (opening for separating opening portion), 2wi- Fixed top wall convolution groove, 2w2-inclined downward groove bottom (bottom for separating opening portion), 2w10,2W12-extension bottom surface, 2w3-fixation top wall internal circle groove, oilhole in 2z-wall, 3-swirling scroll, 4-frame, 5-euclidean Ring, 6-crank axle, 7-motor, 8-chamber (compression chamber), 8a-chamber cylindrical portion, 8a1-collision inner wall, 8b-cavity top cover portion, 8b1-on Lid lower face, 8c-chamber lower cover portion, 10-compression unit, 11-drive division, 12-compression upper space, 13-compression lower part are empty Between, 22-by-passing valve, 23-convolution bearing, 24-base bearing, 25-supplementary bearing, 26-counterbalance valve, 50-suction line (suck stream Road), 55-discharge pipe (the outer discharge unit of machine), 90-suction room, 100-discharge chambe, 105-oil storage portion, 110-back pressure chamber, Space in 120-spacer body, near-end in 120a-barrel opening, 130-spacer body peripheral space are near outside 130a-barrel opening Portion, 130b-bottom (bottom of the outer near-end of barrel opening), 130b1-bottom (bottom of the outer near-end of barrel opening), 140-most Upper chambers, 200-demarcation strip (septation cover), 200b-lower surface (lower surface of septation cover), 201-dish type demarcation strip (separate Lid), 201a-plate oilhole, 202-pot cover shape demarcation strip (septation cover), 202a-pot cover oilhole, the integrally separation of 210-barrel Plate, 220-periphery gap, 225,226-circumferential groove (road under oil stream).

Embodiment

Hereinafter, suitably referring to the drawings, the whirlpool to a mode for applying the present invention to positive displacement compressor in detail The embodiment of rotation compressor 1 illustrates.In addition, in each figure, identical symbol is marked to common part, and omit repetition Explanation.

(the 1st embodiment)

The screw compressor 1 of the 1st embodiment is illustrated using Fig. 1 to Fig. 4 A.Fig. 1 is the vertical of screw compressor 1 Sectional view, Fig. 2 are the amplification longitudinal sections (the S portions of Fig. 1, the J-J sections of Fig. 3) compressed near upper space, and Fig. 3 is compression unit Sectional elevation (Section A-A of Fig. 2), Fig. 4 A be separate opening portion near vertical cutaway view Amplified image (the M portions of Fig. 2).Herein, scheme 2nd, in Fig. 3 priority declaration understanding, eliminate and part (the by-passing valve component parts in Fig. 3 that is not directly dependent upon of explanation Deng).The magnitude relationship of each size of the shape of diagram also illustrates that a mode of implementation.Herein, specific size value is to be vortexed The outside diameter of compressor 1 is, for example, the scope from 10mm to 2000mm.

First, mainly the overall structure of screw compressor 1 is illustrated using Fig. 1.Screw compressor 1, which has, uses chamber 8 (compression chamber) enclose the construction of compression unit 10 and drive division 11.

Compression unit 10 using fixed eddy plate 2, swirling scroll 3, frame 4, euclidean Ring 5 and their adjunct as formed will Element.Drive division 11 is inscape with the crank axle 6 and motor 7 protruded from the lower part of compression unit 10.

Chamber 8 is chamber cylindrical portion 8a by forming side and blocks under cavity top cover portion 8b and chamber above and below it The circle cylinder shape that cap 8c is formed, it is vertical (above-below direction) as the chamber axis of central shaft.As a result, in chamber 8 Be internally formed the chamber interior space for surrounding above-mentioned main inscape.Also, chamber 8 compression unit 10 it is upper square Upper space 12 is compressed into having, and in the compression lower space 13 formed below of compression unit 10.

Erect in the upper surface of the convolution panelling 3a of swirling scroll 3 and be provided with convolution scroll wrap 3b, and convolution overleaf Pin portion 6a of the bearing 23 inserted with the eccentric part as crank axle 6.Also, swirling scroll 3 is rotated by crank axle 6 to be returned Rotation movement, the crank axle 6 are rotationally supported by base bearing 24 of the fixed configurations in frame 4.

Fixed eddy plate 2 is configured to possess：Fixed panelling 2a；Stand up the fixation of the lower face side of fixation panelling 2a Scroll wrap 2b；And it is configured at the stationary platen 2q around fixed scroll tooth 2b.Make these fixed scroll tooth 2b with it is above-mentioned Scroll wrap of circling round 3b engagements, so as to form discharge chambe 100 between the two.

Also, suction inlet 2s (with reference to Fig. 3) is set in fixed eddy plate 2, and is had in suction inlet 2s press-ins from scroll compression The outside of machine 1 imports the suction line 50 (suction passage) of working fluid to fixed eddy plate 2.Also, in the central attached of fixed eddy plate 2 Closely formed with tap 2d.

Also, in fixed eddy plate 2, and it is used for around tap 2d formed with by-pass prot 2e, by-pass prot 2e perforations The fixation panelling 2a in space 120 in connection discharge chambe 100 and the spacer body that will be described in detail below.It is equipped with by-pass prot 2e Only allow the by-passing valve 22 from the flowing in one direction in space 120 into spacer body of discharge chambe 100.Also, in stationary platen The lower surface of 2q connects peripheral groove 2p and discharge chambe 100 formed with cricoid peripheral groove 2p, and wherein way formed with The counterbalance valve flow path 2g of counterbalance valve 26.

Also, in fixed eddy plate 2, euclidean Ring 5 and crank axle 6 are installed on frame 4 (with reference to Fig. 1), and with frame spiral shell The outer peripheral edge portion of stationary platen 2q is fixed on frame 4 by line part 53.Thus, in the back side of swirling scroll 3 (swirling scroll 3 and frame Between frame 4) form back pressure chamber 110.Moreover, euclidean Ring 5 in order to prevent the spinning motion of swirling scroll 3 and be configured at frame 4 with Between swirling scroll 3.

In crank axle 6 formed with the oil supplying hole 6b along longitudinal direction (axial direction) perforation, and press-in has fuel feed pump 6x in lower end.And And the lower part of crank axle 6 is rotatably supported by supplementary bearing 25.

Supplementary bearing 25 is made of ball 25a and fixed configurations in the ballframe carriage 25b of underframe 35, which passes through Chamber cylindrical portion 8a is fixed in welding etc., even if supplementary bearing 25 becomes crank axle 6 and bends the structure that will not produce end thereof contacts. Herein, underframe 35 and in multiple positions formed with underframe oilhole 35a, underframe oilhole 35a is used to make from compression unit 10 oil flowed down are downward under clan.

Motor 7 is made of such as lower component：It is fixed on the rotor 7a of crank axle 6；Hot charging, be pressed into or be welded in chamber cylinder The stator 7b of portion 8a；Motor coil 7c；Upper insulator 7d1 and lower insulation for the insulation that ensures motor coil 7c and stator 7b Sub- 7d2；And motor wire 7e.

It is useful for obtaining the balancer 80 and counterweight balancer of the spin balancing of crank axle 6 in rotor 7a fixed configurations 82.In multiple cutting sections (grooving) 7b1 of the outer circumferential surface of stator 7b formed with the path under as oil stream.Motor wire 7e and fixation The hermetic terminal connection (not shown) of chamber 8 is configured at, externally to 7 supply electric power of motor.

Above-mentioned compression unit 10 throughout complete cycle in a manner of ensuring the oily narrow and small periphery gap 220 that can be flowed down by fixed Position weld part 57 is fixed on chamber cylindrical portion 8a.Also, in cavity top cover portion 8b, fixed configurations, which have, is pressed into fixed whirlpool disk 2 Suction line 50 and discharge pipe 55.

As shown in Fig. 2, screw compressor 1 possesses：To tap 2d (discharge unit in machine) and by-pass prot 2e (discharges in machine Portion) above the demarcation strip 200 (septation cover) that is covered；With the side of outlet 2d1 and by-pass prot 2e to tap 2d The fixation top wall 2w (separation barrel) for the tubular that port 2e1 is surrounded.Demarcation strip 200 is fixed via screw element 200a is separated In the upper surface of fixed top wall 2w.Thus, the fixed eddy plate 2 for combining demarcation strip 200 and fixed top wall 2w and being formed it is upper The composition body in portion becomes spacer body.Also, tap 2d, side are become by the space that fixed top wall 2w and demarcation strip 200 impale Space 120 in the spacer body of through hole 2e openings.

Also, in fixed top wall 2w formed with the fixation top wall that space 120 extends towards outer circumferential side out of spacer body Groove 2w1.The top of fixation top wall trench 2w1 is also covered by demarcation strip 200.Fixation top wall trench 2w1 becomes spacer body The spacer body opening portion that interior space 120 is connected with the spacer body peripheral space 130 in the space of the periphery as fixed top wall 2w. In addition, in the present embodiment, to be said in case of the top of fixed top wall trench 2w1 is covered with demarcation strip 200 The bright structure but it is also possible to be without the fixed top wall trench 2w1 of the covering of demarcation strip 200.

Moreover, formed with topmost room 140 between the top of demarcation strip 200 and cavity top cover portion 8b.Topmost room 140 Connected with spacer body peripheral space 130 by top annulus hole 135, which is the lower end of cavity top cover portion 8b Face and undertake the upper cover lower face 8b1 of the effect of the top wall of spacer body peripheral space 130 with the fixation as separation barrel Circular opening portion between the outer circumferential surface of portion wall 2w.

Also, in the upper surface 2t (compression unit upper surface) of fixed eddy plate 2, the composition for fixing by-passing valve 22 is installed The fixator 22a of component.

As shown in figure 3, fixed top wall trench 2w1 is from the tap 2d positioned at the center of fixed top wall 2w to radial outside Extension.Also, fixed top wall trench 2w1 is circumferentially, equally spaced formed at three positions.In addition, fixed top wall trench 2w1 Two positions can be formed at, four positions can also be formed at.

Also, at the side of fixed eddy plate 2 (outer circumferential surface), and position corresponding with fixed top wall trench 2w1 formed with Circumferential groove 225.Also, at the side of frame 4 (outer circumferential surface), formed with the circumferential groove 226 connected with circumferential groove 225.The periphery Groove 225,226 is played function as road under oil stream.

Pass through circumferential groove 2m formed with the motor wire for supplying motor wire 7e to pass through in the periphery of fixed eddy plate 2.On fixed top The side of wall 2w passes through upper slot 2n formed with the motor wire for supplying motor wire 7e to pass through.Motor wire 7e passes through circumferential groove in motor wire 2m and motor wire by upper slot 2n by, and via demarcation strip 200 (with reference to Fig. 2) motor wire by notch (not shown) and It is connected with hermetic terminal.Herein, in order to make motor wire 7e the lower surface of spacer body peripheral space 130 (bottom surface) nearby by, And in close inner circumferential position by being fixed with the adhesive 250 being connected with fixed eddy plate 2.Wherein, hermetic terminal can also Cavity top cover portion 8b is not welded in, but is welded in chamber cylindrical portion 8a.Also, in chamber 8 in the appropriate stage of assembling Inside enclose oil.Thus, oil storage portion 105 is formed in the bottom of the chamber interior space (with reference to Fig. 1).

As shown in Figure 4 A, as the spacer body peripheral space 130 adjacent with fixed top wall trench 2w1 a part barrel The bottom 130b of the outer near-end 130a of opening and as near-end 120a in the barrel opening of the part in space in spacer body 120 Bottom 120b, space 120 continuously declines (tilting down) towards spacer body peripheral space 130 out of spacer body.In addition, at this In embodiment, by bottom, 120b, 130b are illustrated but it is also possible to be stage exemplified by being the structure continuously declined The structure that declines of (step-like) ground.Also, in the present embodiment, it is the knot of decline (inclination) with bottom 120b, 130b both sides The structure for declining (inclination) but it is also possible to be the bottom 120b in only bottom 120b, 130b is illustrated exemplified by structure, can also It is the structure that only bottom 130b declines (inclination).

Also, the inclined downward groove bottom 2w2 of fixed top wall trench 2w1 includes the bottom of the outer near-end 130a of barrel opening The bottom 120b of near-end 120a in 130b and barrel opening, is configured to out of spacer body space 120 towards spacer body peripheral space 130 linearly continuously decline.Also, 130b is formed at outside barrel opening in case of a part of near-end 130a by bottom Represent but it is also possible to be shown in Fig. 4 B as be described hereinafter to drop to the inclined structure of the mode of circumferential groove 225.

Next, mainly illustrated using flowings of the Fig. 1 to the general working fluid of screw compressor 1.

Crank axle 6 is rotated with motor 7 and swirling scroll 3 is carried out circumnutation, and in swirling scroll 3 and fixed eddy plate Discharge chambe 100 is formed between 2.Therewith, working fluid flows into discharge chambe 100 via suction inlet 2s from suction line 50 (with reference to Fig. 3). The discharge chambe oil passage for connecting oil storage portion 105 and discharge chambe 100 is equipped with the discharge chambe 100, ensure that using the oil of supply The leakproofness of discharge chambe 100, but will be described below to this.Afterwards, working fluid and the oil one of supply to discharge chambe 100 Rise and compressed with the smaller volume of discharge chambe 100, so as to boost.Moreover, working fluid from the upper surface of compression unit 10 (Gu The upper surface of static vortex disk 2) that is, the upper surface open of fixed panelling 2a tap 2d, by-pass prot 2e towards compression unit upper surface Space 120 is discharged in spacer body.That is, tap 2d, by-pass prot 2e are equivalent to discharge unit in machine.

Pressed as a result, chamber interior space whole region becomes discharge.Finally, the row of working fluid discharge unit outside as machine Outlet pipe 55 is discharged outside towards progress machine outside compressor.Out of this machine outside discharge unit (tap 2d and by-pass prot 2e) arrival machine Discharge path in the machine of discharge unit (discharge pipe 55), in order to make to supply the oil to working fluid to oil storage by discharge chambe oil passage Portion 105 returns, equipped with the oily separating mechanism that will be described in detail below.

Next, mainly illustrated using general oily flowings of the Fig. 1 to screw compressor 1.On above-mentioned The oily flowing that discharge path midway is separated in machine, is described in detail in the oily separating mechanism of explanation.

The oil in oil storage portion 105 is because of discharge pressure (pressure of the inside of chamber 8) and back pressure (pressure of the inside of back pressure chamber 110) Between differential pressure, from oil storage portion 105 by the oil supplying hole 6b in fuel feed pump 6x, crank axle 6 and to convolution bearing 23 and base bearing 24 are lubricated, and flow into back pressure chamber 110 afterwards.

Herein, the pressure of the convolution bearing chamber 115 on the top of pin portion 6a becomes discharge and presses, and undertakes to fixed eddy plate 2 to returning The effect that vortex disk 3 exerts a force.Also, using centrifugal force from oil supplying hole 6b to 25 fuel feeding of supplementary bearing.Also, carried on the back due to flowing into Oily pressure before pressure chamber 110 is discharge pressure, so the back pressure rising because of the oily inflow.Also, due to that must mix in the oil Conjunction has working fluid (in most cases, mass concentration is more than 10%), so subtracting because being flowed into caused by back pressure chamber 110 Pressure, working fluid are drastically vaporization from oil (foaming).Due to working fluid volume increase because of gasification, so back pressure chamber 110 Interior oil becomes the water mist state that tiny oil droplet swims in the working fluid to have gasified.In this way, it is scattered in back pressure chamber 110 The mist of oil of whole region carries out the lubrication of euclidean Ring 5.Afterwards, oily majority is equipped with the counterbalance valve stream of counterbalance valve 26 in midway Road 2g is by and flowing into discharge chambe 100.

On the other hand, an oily part for back pressure chamber 110 has been flowed into stationary platen 2q and convolution panelling 3a (with reference to Fig. 2) Between small gap by and to suction room 90 (with reference to Fig. 3) stream for reaching 100 last stage of discharge chambe (before closing terminates) Enter.Also, there is also set the situation of the energetically mechanism to suction 90 fuel feeding of room (for example, referring to Japanese Patent No. 5548586 Number).The oil of the suction room 90 is flowed into by controlling in appropriate amount, the leakproofness because sucking room 90 produces volume efficiency improving effect Improve, so as to play the effect for improving compressor efficiency.

As described above, oil flows temporarily into back pressure chamber 110 from oil storage portion 105 by the bearing 23 that circles round, base bearing 24, and Oil passage from counterbalance valve flow path 2g, towards suction room 90 flows into discharge chambe 100 via suction inlet 2s, suction room 90.Moreover, Oil keeper load improves the effect of the leakproofness of discharge chambe 100.That is, the oil circuit of discharge chambe 100 is connected to from the oil storage portion 105 Footpath becomes discharge chambe oil passage.

Also, there is the construction that valve plate is pushed on to valve seat with compression spring arranged on the counterbalance valve 26 of counterbalance valve flow path 2g. Thus, back pressure is controlled as the pressure of the discharge chambe 100 (connection discharge chambe 101, with reference to Fig. 2) than being connected with counterbalance valve flow path 2g The substantially above pressure of certain value.Moreover, above-mentioned substantially certain value (average pressure of back pressure-connection discharge chambe 101) can Set by adjusting the decrement of above-mentioned compression spring.Using the back pressure and the discharge pressure of convolution bearing chamber 115, to fixed whirlpool Disk 2 exerts a force swirling scroll 3.Thus, reduce gap between scroll wrap front end face and panelling and suppress the inside of discharge chambe 100 Leakage, so as to improve compressor efficiency.Afterwards oil mixed with working fluid and with working fluid flowing from tap 2d, By-pass prot 2e is sprayed to the chamber interior space.

Herein, the fry dried food ingredients in discharge chambe 100 waves the effect for the leakproofness for improving discharge chambe 100, and plays and suppress discharge chambe The leakage of working fluid in 100, so as to improving the effect of compressor efficiency.For discharge unit in slave (tap 2d, bypass Hole 2e) and working fluid spray together and for becoming mist-like oil, as carried out with the explanation of the flowing of working fluid Illustrate like that, to be separated with working fluid by the oily separating mechanism that will be described in detail below and become oil droplet, afterwards along compression unit 10 periphery gap 220, circumferential groove 225,226 flow down, and reach compression lower space 13.

Moreover, the inner surface of one edge chamber cylindrical portion 8a of oil, while by motor 7 and to the oil storage portion in foot 105 return.Herein, motor 7 is in the stator 7b that cutting section 7b1, the motor coil 7c of the outer circumferential surface arranged on stator 7b are passed through Vertical hole pass through.Herein, the Zhi Liuxiang compressions lower space 13 of working fluid flows into, but mainstream is not flowed into it, so as to compress The flowing of the working fluid of the whole region of lower space 13 is extremely weak.Thus, oil is not produced in portion space 13 under compression again Water atomization, so as to be reduced the effect of oil content.

Next, using the sectional view of Fig. 2 to Fig. 4 A, the oily separating mechanism of the discharge path in machine is carried out in detail Explanation.In the sectional view of Fig. 2 to Fig. 4 A, section is represented and than the section by inboard working fluid and institute with heavy solid line arrows The oily streamline contained.Equally, the oily flowing isolated from working fluid is represented with solid arrows.Herein, the M portions of Fig. 2 Oily flowing represent in Figure 4 A, only be briefly represented in Fig. 2 and Fig. 3.Also, in Fig. 3, represented with double dot dash line than cutting Prior flowing in the flowing nearby in face.First, the structure of discharge path in machine is illustrated.

Next, the oily separating action on discharge path in the machine of the structure illustrated so far, the flowing to oil Flowing this both sides with working fluid illustrate.

If the working fluid containing oil sprays upward from tap 2d, collided with the lower surface 200b of demarcation strip 200. As a result, omnirange (with reference to Fig. 3) bending of the flowing of working fluid to horizontal direction (with reference to Fig. 2).On the other hand, due to oil Inertia is larger compared with working fluid, so the majority of oil is collided with demarcation strip 200.As a result, oil is attached to demarcation strip 200 lower surface 200b, from working fluid separation (with reference to Fig. 2).

Herein, if the viscosity of oil is higher, the oily ratio adhered to becomes higher, and the oil separating action can be effectively performed. In the case that oily viscosity during discharge under steady running environment is more than 0.01Pas, working fluid can not depended on Mass velocity, make the oily centrifugation based on collision high.For example, pressed in the hot-warer supplying machine using carbon dioxide as refrigerant It is suitable for the condition in the case of contracting machine.Due to working fluid finally from arranged on the discharge pipe 55 on compressor top towards discharging outside machine, So the lower surface 200b of the top in space 120 that is, demarcation strip 200 is flowed about along spacer body.It is described in further detail, due to In spacer body the inside in space 120 because of the collision of working fluid and demarcation strip 200 movement disorder, so the tendency (is separating The tendency that the lower surface 200b of plate 200 nearby passes through) it is weaker, but carry out the fixation described later of rectification in the flowing to working fluid In the wall trench 2w1 of top, which clearly shows.The oil for being attached to demarcation strip 200 is pressed by the flowing of working fluid, and is reached The inner peripheral surface 2w3 (dash-double-dot arrow with reference to Fig. 3 close to middle position) of fixed top wall 2w.Afterwards, the oily edge because of gravity The inner peripheral surface 2w3 of fixed top wall 2w is flowed down to the upper surface 2t of fixed eddy plate 2.

However, the aperture area of the outer circumferential side opening portion 2w4 (with reference to Fig. 3) of fixed top wall trench 2w1 is set as on fixed Less than the 1/2 of the area (outer circumferential area) of the outer circumferential surface 2w6 (with reference to Fig. 3) of portion wall 2w.Set in this way, by working fluid The situation for being present in the inner peripheral surface 2w3 of fixed top wall 2w before pressing becomes more, so that as described above, can be along fixed top wall The inner peripheral surface 2w3 of 2w becomes more to the situation that the upper surface 2t of fixed eddy plate 2 is flowed down (with reference to Fig. 2).Thereby, it is possible to make most regions Oil from the lower surface 200b of the demarcation strip 200 of the mainstream close to working fluid to certain degree the mainstream away from working fluid The upper surface 2t of fixed eddy plate 2 is flowed down.Thus, it is reduced the effect of oil content.

On the other hand, and there is also the oil that fixed top wall trench 2w1 is reached by the flowing pressing of working fluid, but due to solid Determine that top wall 2w is diametrically thicker, so oil reaches fixed top wall trench 2w1's during fixed top wall trench 2w1 is being passed through Side 2w5 (with reference to Fig. 3), and reach the bottom surface of fixed top wall trench 2w1 that is, inclined downward groove bottom 2w2 (reference Fig. 3, figure 4A).Water atomization again thus, it is possible to suppress oil, additionally is able to reduce oil content.Herein, the bottom surface of fixed top wall trench 2w1 Have：Fixed top wall trench 2w1；As near-end outside the barrel opening of a part for spacer body peripheral space 130 adjacent thereto The bottom 130b of 130a (with reference to Fig. 4 A) (with reference to Fig. 4 A)；And one as the space 120 in the adjacent spacer body in opposite side The bottom 120b of near-end 120a (with reference to Fig. 4 A) in partial barrel opening (with reference to Fig. 4 A).

As described above, the oil to the upper surface 2t (compression unit upper surface, with reference to Fig. 2) for reaching fixed eddy plate 2 is major part, But also there is a small amount of oil from 200 aggregation of demarcation strip to larger oil droplet and because of gravity and directly to the upper surface 2t of fixed eddy plate 2 Situation about dripping.At this time, due to becoming oil droplet, surface area is smaller compared with volume, so that the possibility of water atomization is relatively low again. With longitude and latitude as described above, the relatively low part of the oily upper surface 2t in fixed eddy plate 2 of the upper surface 2t of arrival fixed eddy plate 2 Aggregation.

For example, oil there is no the component parts of by-passing valve 22 that is, is being fixed on the tabular of the upper surface 2t of fixed eddy plate 2 The aggregation such as the part of fixator 22a (with reference to Fig. 2).Moreover, if thickness change up to certain degree of oil, oily along inclined downward groove Bottom surface 2w2 flows out (with reference to Fig. 4 A) to spacer body peripheral space 130.As shown in Figure 4 A, the inclined downward groove bottom 2w2 and outside A part (barrel opening outer near-end 130a) for the adjacent spacer body peripheral space 130 in side and in the adjacent separation in inner side The part (near-end 120a in barrel opening) in internal space 120 together, with out of spacer body space 120 towards outside spacer body All spaces 130 continuously reduce (decline) without horizontal plane.Because inclined downward groove bottom 2w2 is (including outside barrel opening Near-end 120a in near-end 130a and barrel opening), oil using gravity and out of spacer body space 120 towards spacer body peripheral space 130 rapid outflows.Since oil covers at least top of the upper surface 2t and inclined downward groove bottom 2w2 of fixed eddy plate 2, So oil film of the aggregation in the upper surface 2t of fixed eddy plate 2 is pulled because of the oil under inclined downward groove bottom 2w2 streams.

That is, aggregation is also pulled in the oil of the upper surface 2t of fixed eddy plate 2 because of gravity, so that in fixed eddy plate The amount of 2 upper surface 2t aggregations is reduced.I.e. it is capable to shorten the time in the upper surface 2t delays of fixed eddy plate 2.By This, although the somewhat mainstream away from working fluid, can also suppress also somewhat to leave the possibility of water atomization again Oily delay in the upper surface 2t (compression unit upper surface) of the fixed eddy plate 2 of property.Thus, the effect for reducing oil content is produced.

But, it is also considered that the method for the upper surface 2t and the distance between demarcation strip 200 of increase fixed eddy plate 2.The situation Under, the less oil droplet not collected can not it is multiple concentration and formed oil film so as to disconnect oil droplet state under, due to edge The time of the inner surface flowing of fixed top wall 2w is elongated, so that the increase of water atomization again of oil, opposite oil content increase.But In the present embodiment, since demarcation strip 200 becomes tablet, so dividing caused by fixed top wall trench 2w1 and demarcation strip 200 Separate the size of the above-below direction of oral area with out of spacer body space 120 continuously increase towards spacer body peripheral space 130 Add.As a result, as described above, in the mainstream of the working fluid of the upper flow of fixed top wall trench 2w1 and the flow separation of oil, So as to which the possibility of water atomization again further reduces, the effect for reducing oil content is further produced.

As described above, separate most oil because of the collision of working fluid and the lower surface 200b of demarcation strip 200, to Spacer body peripheral space 130 flows out, and finally flow into 220, three positions in periphery gap circumferential groove 225,226 (with reference to Fig. 2, Fig. 3).But also exist in the oil separation of the first stage can not separated oil, therefore the next following oil to second stage Separating mechanism illustrates.

It is attached in the oil of above-mentioned demarcation strip 200, is moved to fixed top wall trench 2w1's because of the flowing of working fluid The oil of the end 200d (with reference to Fig. 4 A) of the demarcation strip 200 of outlet portion is involved in work again since path afterwards disconnects Make fluid.But its form is to become more compared to the situation of mist of oil and the size close to oil droplet.Also, in mist of oil originally compared with Small mist of oil is not collided with demarcation strip 200, is changed direction and is flowed out to spacer body peripheral space 130.The less mist of oil of script Also the movement disorder because of the collision of working fluid, so as to mutually be collided and aggregation in the midway of flowing, generates to close to oil droplet Size.In this way, contain more than half oily working fluid from fixed top wall trench 2w1 blowouts with less oil droplet state, and with work For the collision inner wall 8a1 collisions of the inner surface of chamber cylindrical portion 8a.Herein, and the above-mentioned collision based on demarcation strip 200 The first stage of oily separating mechanism carries out oily separation in the same manner.

As noted previously, as oil becomes less oil droplet state, so the ratio for being attached to collision inner wall 8a1 is higher, from And efficiently carry out oily separation.In addition, as shown in Fig. 2, Fig. 4 A, upper cover lower face 8b1 becomes the upper of spacer body peripheral space 130 Portion's wall, and the mainstream of working fluid is bent in an inverse manner, so that the larger oil of inertia cannot be bent and most completely It is attached to the wall of the lower face 8b1 including cavity top cover portion 8b.Thus, the effect of oil content can further be reduced by having Fruit.

Moreover, be attached to the oil of collision inner wall 8a1 and the wall near it to immediately below it and aperture area compared with Big circumferential groove 225 flows into (with reference to Fig. 3, Fig. 4 A).Herein, circumferential groove 225 be configured near collision inner wall 8a1 and from The upper surface 2t (compression unit upper surface) of fixed eddy plate 2 leads to road under the flow path of compression lower space 13 that is, oil stream.

As described above, it will not be detained because of circumferential groove 225 and along the collision inner wall 8a1 oil flowed down, so as to avoid oil Water atomization again.Therefore, the effect of oil content can further be reduced by having.

In this way, most of oily working fluid is isolated finally as the outer of the fixation top wall 2w for separating barrel Circular opening portions that is, top annulus hole 135 of the side face 2w6 (with reference to Fig. 3) between the 8b1 of lower face are (with reference to Fig. 2, figure 4A) by and being flowed to topmost room 140.Since the volume of the topmost room 140 is at least than the appearance in space in spacer body 120 Product is big, so the flow velocity of working fluid is slow.Also, due to the action element of no valve, motor etc., so flowing is disorderly Diminish.Further, since the discharge pipe 55 as discharge unit outside machine is located at topmost, thus generally compared with working fluid density compared with High oil is settled because of gravity.

Thus, the oil somewhat contained is also settled in topmost room 140, so as to be attached to the upper surface 200c of demarcation strip 200. After the oil somewhat aggregation, along the outer circumferential surface 2w6 as the fixation top wall 2w for separating barrel flow and to spacer body The flows of peripheral space 130, finally flow into periphery gap 220, circumferential groove 225.Thus, have further to reduce and contain The effect of oil cut rate.

As a result, it is possible to stably improve the leakproofness of discharge chambe 100, so that efficient positive displacement pressure can be realized by having The effect of contracting machine.Also, the worry of insufficient lubrication is avoided due to that can realize towards the stabilization fuel feeding of the sliding parts such as bearing, so The effect of the high positive displacement compressor of reliability can be realized by having.In addition, having can also realize using discharge outside the machine that carried out The effect of the high performance of the equipment (for example, heat exchanger etc.) of working fluid.

In addition, in the 1st embodiment, make all inclined downward groove bottom 2w2 of multiple fixed top wall trench 2w1, but In the case where because of some restrict inclined downward groove bottom 2w2 cannot be set in whole fixation top wall trench 2w1, also may be used So that fixed at least one of top wall trench 2w1 is inclined downward groove bottom 2w2.

Hereinafter, a pair embodiment different from the 1st embodiment illustrates.Pair composition identical with the 1st embodiment Key element marks identical symbol, and the repetitive description thereof will be omitted.Also, also omit weight for the effect identical with the 1st embodiment Multiple explanation.

(the 2nd embodiment)

The screw compressor of the 2nd embodiment is illustrated using Fig. 4 B.Fig. 4 B are the M portions of Fig. 2 of screw compressor 1 That is, the vertical cutaway view Amplified image separated near opening portion of screw compressor.2nd embodiment is to make inclined downward groove bottom 2w2 Rake continuous to outer peripheral side extend to circumferential groove 225 and as extending the structure of bottom surface 2w10.

In 2nd embodiment, fixing the bottom surface of top wall trench 2w1 that is, extending bottom surface 2w10 includes near-end in barrel opening The bottom 130b1 of the outer near-end 130a of the bottom 120b and barrel opening of 120a, be configured to out of spacer body space 120 towards point Spacer peripheral space 130 and linearly continuously drop to circumferential groove 225.

Oil of the aggregation in the relatively low part of the upper surface 2t of fixed eddy plate 2 is empty towards spacer body periphery along bottom surface 2w10 is extended Between 130 outflow.In 2nd embodiment, extend bottom surface 2w10 and be configured to linearly continuously drop to circumferential groove 225, so that with 1st embodiment is compared, oily to the bottom 130b1 as the near-end 130a outside the barrel opening of the position of working fluid Outflow.Therefore, the oily holdup time extended in the 2w10 of bottom surface is shorter than the 1st embodiment.That is, with the 1st embodiment Compare, oil, which faster arrives, reaches circumferential groove 225.

Working fluid movement disorder near collision inner wall 8a1, and flow velocity locally increases.But since oil is to remote The position outflow of working fluid, and be difficult to be stranded in and extend bottom surface 2w10, so as to reduce the flow velocity because of working fluid The danger of water atomization again caused by increase.Therefore, the 2nd embodiment has the effect for the reduction that can realize oil content.

(the 3rd embodiment)

The screw compressor of the 3rd embodiment is illustrated using Fig. 4 C.Fig. 4 C are the M portions of Fig. 2 of screw compressor 1 That is, the vertical cutaway view Amplified image separated near opening portion of screw compressor.3rd embodiment is in fixed top wall 2w The underface of side face 2w3 sets (the outermost side one in space 120 is enclosed in spacer body) fixed top wall internal circle groove of a circle The structure of (space circumferential groove in spacer body) 2w11.

In 3rd embodiment, the extension bottom surface 2w10 as the bottom surface of fixed top wall trench 2w1 is included in fixed top wall The bottom 130b1 of the outer near-end 130a of circumferential groove 2w11 and barrel opening, is configured to out of spacer body space 120 towards outside spacer body All spaces 130 continuously drop to circumferential groove 225.

In 3rd embodiment, due to formed with fixed top wall internal circle groove 2w11, so when aggregation is in fixed eddy plate 2 When height of the oil film of upper surface 2t to upper surface is relatively low, oil can be made to fixed top wall internal circle groove 2w11 outflows, that is, Saying can separate with the mainstream of working fluid, so as to further suppress from aggregation in the oil of the upper surface 2t of fixed eddy plate 2 The water atomization again that film produces.Therefore, the 3rd embodiment has the effect for the reduction that can realize further oil content.

(the 4th embodiment)

The screw compressor of the 4th embodiment is illustrated using Fig. 4 D.Fig. 4 D are the M portions of Fig. 2 of screw compressor 1 That is, the vertical cutaway view Amplified image separated near opening portion of screw compressor.4th embodiment is in fixed top wall trench 2w1 Midway sets step difference 2w13 (declining to the stage) and becomes the structure for extending bottom surface 2w12.

, can be physically (total using the step difference 2w13 arranged on the midway of fixed top wall trench 2w1 in 4th embodiment Close ground) expand the distance between the flowing of oil and the mainstream of working fluid.Therefore, it is possible to further reduce from by fixation The water atomization again that oil film during portion wall trench 2w1 produces.Therefore, there is the effect for the reduction that can realize further oil content.

(the 5th embodiment)

The screw compressor of the 5th embodiment is illustrated using Fig. 4 E.Fig. 4 E are the M portions of Fig. 2 of screw compressor 1 That is, the vertical cutaway view Amplified image separated near opening portion of screw compressor.5th embodiment is that instead of point of the 3rd embodiment Partition plate 200 and fixed top wall 2w and set by dish type demarcation strip 201 (septation cover) and fixed top wall 2wh (separating tubes Wall) form spacer body structure.

Dish type demarcation strip 201 is proximate to the circular plate shape that middle position is flat and outer edge tilts, close to middle position Flat part and position above fixed top wall 2wh formed with plate oilhole 201a.Also, in fixed top wall 2wh, the wall formed with the lower part connection for making the outer circumferential surface 2w6 of position corresponding with plate oilhole 201a and fixed top wall 2wh Interior oilhole 2z.

The dual fine line of Fig. 4 E represent from topmost room 140 fall to spacer body upper surface (dish type demarcation strip 201 Upper surface 201c) oil towards periphery gap 220 or circumferential groove 225 flowing.Dual fine dotted line is hidden line, is represented in plate The oil circuit footpath of oilhole 2z flowings in oilhole 201a and wall.

Since the outer edge 201b of dish type demarcation strip 201 is tilted, so from as the fixation top wall trench for separating opening portion The direction for the working fluid that 2w1 is blown out towards spacer body peripheral space 130 tilts upward than level.Thereby, it is possible to physically expand Distance greatly between the oil that the bottom 130b1 of spacer body peripheral space 130 flows.Thus, it is possible to further suppress from The water atomization again that the oil film of the bottom 130b1 flowings of spacer body peripheral space 130 produces.Therefore, having further to realize The effect of the reduction of oil content.

Also, due to equipped with oilhole 2z in plate oilhole 201a and wall, so for being settled and aggregation from topmost room 140 For the oil of the upper surface 201c of dish type demarcation strip 201, it is not necessary to inner peripheral surface that is, fixation along spacer body peripheral space 130 The outer circumferential surface 2w6 of top wall 2w is flowed down.Therefore, from spacer body peripheral space 130 as the fixation top wall 2wh for separating barrel Outer circumferential surface 2w6 and lower face 8b1 between circular opening portion that is, top annulus hole 135 by, and can avoid to Oily water atomization again in the path for the working fluid that topmost room 140 is flowed.Therefore, the 5th embodiment has and can realize more The effect of the reduction of further oil content.

(the 6th embodiment)

The screw compressor of the 6th embodiment is illustrated using Fig. 4 F.Fig. 4 F are the M portions of Fig. 2 of screw compressor 1 That is, the vertical cutaway view Amplified image separated near opening portion of screw compressor.6th embodiment is that instead of the disk of the 5th embodiment Shape demarcation strip 201 and equipped with pot cover shape demarcation strip 202 (septation cover) structure.

The central portion 202b of pot cover shape demarcation strip 202 is prominent upward and outer edge 202c is tilted, central portion 202b with There is flat part 202d between the 202c of outer edge, and possess in the position above fixed top wall 2wh of flat part 202d Plate oilhole 202a.Also, fixed top wall 2wh is formed with making position corresponding with plate oilhole 202a and fixed top wall Oilhole 2z in the wall of the lower part connection of the outer circumferential surface 2w6 of 2wh.

Also, pot cover shape demarcation strip 202 is formed as, outer circumferential surface 2w6s of the outer edge 202c than fixed top wall 2w is to periphery Side protrudes.Thus, the size H of the above-below direction of the outer near-end 130a of barrel opening is configured to 120 court of space out of spacer body Continuously increase to spacer body peripheral space 130.In addition, in the 6th embodiment, continuously increased with the size H of above-below direction In case of be illustrated but it is also possible to be interim increased structure.

The working fluid and pot cover shape demarcation strip of discharge unit blowout out of machines such as tap 2d, by-pass prot 2e (with reference to Fig. 2) 202 collisions.The oil edge of pot cover shape demarcation strip 202 is attached to because of the collision from the central portion 202b courts of pot cover shape demarcation strip 202 Inclination and gravity to flat part 202d are also acted on and moved towards fixed top wall trench 2w1 sides.That is, it is attached to pot cover shape The oil of demarcation strip 202 is moved to the fixed top wall trench 2w1 required times and shortens.Therefore, it is possible to further suppress in pot Water atomization again during the lower surface 202e movements of lid demarcation strip 202.

Also, the upper surface of pot cover shape demarcation strip 202 is tilted from central portion 202b towards flat part 202d.Therefore, for Settled from topmost room 140 and aggregation is for the oil of the upper surface of pot cover shape demarcation strip 202, along from pot cover shape demarcation strip 202 Central portion 202b towards flat part 202d inclination and to fixed top wall trench 2w1 sides movement.That is, it is attached to pot cover The time that the oil of the upper surface of shape demarcation strip 202 enters in wall untill oilhole 2z shortens.Therefore, it is possible to further suppress oil in pot Water atomization again during the upper surface flowing of lid demarcation strip 202.According to the effect, also there is the effect for the reduction that can realize oil content Fruit.

(the 7th embodiment)

The screw compressor of the 7th embodiment is illustrated using Fig. 4 G.Fig. 4 G are the M portions of Fig. 2 of screw compressor 1 That is, the vertical cutaway view Amplified image separated near opening portion of screw compressor.

7th embodiment is configured to, and the bottom surface of fixed top wall trench 2w1 is set to bottom surface 2w20, bottom surface 2w20 is not wrapped The bottom 120b of near-end 120a in the bottom 130b and barrel opening of the outer near-end 130a of barrel opening is included, and is configured in fixation Space 120 linearly declines towards spacer body peripheral space 130 out of spacer body at portion wall trench 2w1.

Bottom surface 2w20 in the midway that space 120 linearly declines towards spacer body peripheral space 130 out of spacer body, although There cannot be the region risen, but there may be small horizontal surface areas.

Even if due to the bottom surface 2w20 being set to the bottom surface of fixed top wall trench 2w1 in present embodiment, on fixed top The flowing of the mainstream of the working fluid of the upper flow of wall trench 2w1 and oil also separates, and institute is so as to the possibility of reduction water atomization again Property.Thus, in the 7th embodiment, also obtain realizing the effect of the reduction of oil content.

(the 8th embodiment)

The screw compressor of the 8th embodiment is illustrated using Fig. 5.Fig. 5 is the horizontal stroke of the compression unit of screw compressor 1 Sectional view (Section A-A of Fig. 2).8th embodiment is configured to, and point of working fluid will be blown out to spacer body peripheral space 130 The direction for separating oral area is set to from the fixation top wall of the inner peripheral surface vertical off setting relative to chamber cylindrical portion 8a convolution groove 2wi.

From the working fluid that the tap 2d positioned at the center of fixed top wall 2w is discharged because of fixed top wall convolution groove 2wi And the convolution in spacer body peripheral space 130.At this time, the big oil of the density of density ratio working fluid contained by working fluid because from Mental and physical efforts and the inner peripheral surface for being attached to chamber cylindrical portion 8a, so as to be separated with working fluid.Thus, have can be real for the 8th embodiment The effect being greatly reduced of existing oil content.

Identical with the 1st embodiment in 8th embodiment, motor wire 7e is in the bottom of spacer body peripheral space 130 and leans on Nearly inner circumferential position passes through.That is, motor wire 7e is empty in the spacer body periphery that mainstream passed through of the swirling flow of working fluid Between 130 top do not passing through close to circumferential position.Therefore, motor wire 7e will not make the swirling flow of working fluid disorderly.

If in addition, hermetic terminal (diagram is omitted) is not arranged on cavity top cover portion 8b, and (join arranged on compression lower space 13 According to Fig. 1) chamber cylindrical portion 8a, then motor wire 7e do not pass through in spacer body peripheral space 130.Therefore, will not be because of motor wire 7e and make the swirling flow of working fluid disorderly, it is and more efficient.

(the 9th embodiment)

The screw compressor of the 9th embodiment is illustrated using Fig. 6.Fig. 6 is the amplification vertical profile for separating open bottom View (the P portions of Fig. 2).9th embodiment is configured to, and makes the bottom surface (lower section as the fixation top wall 2w for separating open bottom Tilt groove bottom 2w2, extend bottom surface 2w10,2w12) at least one of surface roughness than septation cover (demarcation strip 200, disk Shape demarcation strip 201, pot cover shape demarcation strip 202) lower surface 200b (with reference to Fig. 4 A), 201d (with reference to Fig. 4 E), 202e is (with reference to figure Surface roughness 4F) is big.

Since the oil of the lower surface 200b (with reference to Fig. 4 A) of demarcation strip 200 (septation cover) is in the attached of the mainstream of working fluid Closely, so the possibility of water atomization becomes higher again.In order to suppress water atomization again, oil is set to divide as soon as possible to the mainstream of working fluid From the fixed eddy plate 2 as compression unit upper surface upper surface 2t movement be important.That is, oil is set rapidly to move It is important extremely with the upper surface 2t of fixed eddy plate 2 connecting portions being connected that is, as the fixation top wall trench 2w1 of separation barrel.

In oily movement in the lower surface 200b of demarcation strip 200, the power that is subject to from the flowing of working fluid, gravity etc. compared with Small power is motive power.Therefore, in order to suppress to hinder the frictional force in mobile face, it is necessary to reduce the lower surface of demarcation strip 200 The surface roughness of 200b.

However, as the fixation top wall trench 2w1 for separating opening portion in order to allow oil stream to move and with being lower towards outer circumferential side. Therefore, oily flowing accelerates, and oil is local easily to be left from the bottom surface of fixed top wall trench 2w1, so as to there is the possibility of water atomization again The worry that property becomes higher.That is, improving oil and the close property of the bottom surface of fixed top wall trench 2w1 becomes important, it is necessary to increase The actual surface area of the bottom surface of fixed top wall trench 2w1.

Thus, in the 9th embodiment, demarcation strip is formed using the plate (usual below Ra3.2) of metallic plate processing 200.Also, fixed eddy plate 2 uses casting (such as usual more than Ra25 in sand-cast), the bottom surface of fixed top wall trench 2w1 It is the state of casting face (casting control surface).The surface roughness of bottom surface thereby, it is possible to make fixed top wall trench 2w1 compares demarcation strip The surface roughness of 200 lower surface 200b is big.

Thus, without prejudice to the oily movement in the lower surface 200b of demarcation strip 200, fix in the bottom surface of top wall trench 2w1 Oily close property become higher, so as to suppress oil water atomization again.Therefore, in the 9th embodiment, oil-containing can be realized by having The effect being greatly reduced of rate.In addition, in the 9th embodiment, by making the bottom surface of fixed top wall trench 2w1 for casting face State, can realize the reduction of processing charges.

(the 10th embodiment)

The screw compressor of the 10th embodiment is illustrated using Fig. 7.Fig. 7 is to compress putting near upper space 12 Big longitudinal section (the S portions of Fig. 1).It is to use (to separate the fixation top wall 2w in the 1st embodiment in 10th embodiment Barrel) and demarcation strip 200 (septation cover) integration after barrel one demarcation strip 210 structure.The barrel one demarcation strip 210 Formed by carrying out punch process etc. to a metallic plate (plate).

Barrel one demarcation strip 210 possesses：To the cap 210p covered above tap 2d (discharge unit in machine) (septation cover)；The row of tap 2d is surrounded into the upper surface 2t of cap 210p and fixed eddy plate 2 (compression unit upper surface) connections Export the barrel 210w (separation barrel) of 2d1；And as the integral separation cuts 210h for separating opening portion.Also, barrel one Body demarcation strip 210 is utilized one to separate screw element 210a and is fixed on the upper surface of fixed eddy plate 2 in the outer circumferential side of barrel 210w 2t。

In 10th embodiment, make the shape simplification of the upper surface 2t of covering fixed eddy plate 2, so as to obtain implementing with the 1st The identical effect of mode, and it is reduced the effect of cost.

In addition, present disclosure is not limited to the above embodiment, certainly can in the range of its purport is not departed from Carry out suitably change, change etc..Compressor in the embodiment illustrated so far is screw compressor, if but making to come Temporarily carry out discharging and carrying out in machine the positive displacement for the form discharged after oily separation outside carry out machine from the working fluid of compression unit Compressor, then the present invention can be applied to the compressors of all types.For example, it can also apply to the compression of rolling piston type Machine, screw compressor, vane compressor.

In the embodiment illustrated so far, viscous fluid separated with working fluid is oil, but according to circumstances not Same can also be other fluids.For example, strongly avoiding the situation of the air compressor as oil is mixed into discharging gas Under, water is used instead of oil, position for recording oil is substituted for water in the case of these.For example, it can be applied to water profit Sliding screw compressor etc..

Claims (10)

1. a kind of positive displacement compressor, it is characterised in that possess：

Compression unit, it possesses the discharge chambe that the working fluid of the low pressure to being externally introduced by suction passage is compressed；

Compression chamber, it compresses upper space, the pressure formed below in above-mentioned compression unit to be formed in the top of above-mentioned compression unit The mode of contracting lower space surrounds above-mentioned compression unit；

Discharge unit in machine, it makes compression unit of the working fluid after being boosted by above-mentioned compression unit from the upper surface as the compression unit Discharged into above-mentioned compression upper space carry out machine upward upper surface；

The outer discharge unit of machine, it connects above-mentioned compression upper space with said external, and the working fluid after boosting is carried out machine Outer discharge；

Oil storage portion, it is at least arranged on above-mentioned compression lower space；

Discharge chambe oil passage, it supplies the oil in above-mentioned oil storage portion to above-mentioned discharge chambe；And

Spacer body, it is made of septation cover and separation barrel, which covers the top of discharge unit in above-mentioned machine, the separating tube Wall connects the septation cover and above-mentioned compression unit upper surface and the outlet to discharge unit in above-mentioned machine surrounds,

Above-mentioned spacer body possesses：As space in the spacer body of the inner space of the spacer body；As the outer of above-mentioned separation barrel The spacer body peripheral space in side space；And make multiple separations that space is connected with the spacer body peripheral space in the spacer body Opening portion,

The bottom of at least one above-mentioned separation opening portion with out of above-mentioned spacer body space towards above-mentioned spacer body peripheral space And continuously or periodically decline.

2. positive displacement compressor according to claim 1, it is characterised in that

It is at least one above-mentioned separation opening portion, as the above-mentioned spacer body peripheral space adjacent with the separation opening portion one The bottom of the outer near-end of partial barrel opening or one as space in the above-mentioned spacer body adjacent with the separation opening portion The bottom of near-end is including the bottom of above-mentioned separation opening portion in the barrel opening divided, with the space court out of above-mentioned spacer body Continuously or periodically decline to above-mentioned spacer body peripheral space.

3. positive displacement compressor according to claim 2, it is characterised in that

The above-below direction size of the outer near-end of above-mentioned barrel opening with out of above-mentioned spacer body space towards above-mentioned spacer body periphery Space and continuously or periodically increase.

4. positive displacement compressor according to claim 1, it is characterised in that

The aperture area of above-mentioned separation opening portion in the periphery of above-mentioned separation barrel is the whole outer circumferential surface of above-mentioned separation barrel Long-pending less than 1/2.

5. positive displacement compressor according to claim 1, it is characterised in that

At least one above-mentioned separation opening portion is set to opposite with the collision inner wall of a part for the inner wall as above-mentioned compression chamber.

6. positive displacement compressor according to claim 5, it is characterised in that

Near above-mentioned collision inner wall, equipped with leading to from above-mentioned compression unit upper surface under the oil stream of above-mentioned compression lower space Road.

7. positive displacement compressor according to claim 1, it is characterised in that

The above-mentioned separation barrel and above-mentioned septation cover of above-mentioned spacer body are made of a plate.

8. positive displacement compressor according to claim 2, it is characterised in that

The bottom of near-end in the bottom of above-mentioned separation opening portion, the bottom of the outer near-end of above-mentioned barrel opening and above-mentioned barrel opening At least one of surface roughness it is bigger than the surface roughness of the lower surface of above-mentioned septation cover.

9. positive displacement compressor according to claim 8, it is characterised in that

Above-mentioned separation open bottom is set to casting control surface.

10. according to the positive displacement compressor described in any one of claim 1~9, it is characterised in that

Oily viscosity under steady running environment is set to more than 0.01Pas.