CN103423157B - Screw compressor - Google Patents

Abstract

The present invention provides the screw compressor of a kind of damage preventing compression mechanical part when can be flowed in compressor in a large number within the liquid material short time such as liquid refrigerant, refrigerating machine oil.The screw compressor of the present invention is characterised by, when carrying out circling round relative to fixed eddy plate (5) in whirlpool dish (6) of circling round and be compressed working fluid in discharge chambe (11), at least one relief valve device (release aperture (15a)) configures towards the suction inlet (5a) sucking working fluid all the time via working fluid path (scroll gas passage (5b)).

Description

Screw compressor

Technical field

The present invention relates to screw compressor.

Background technology

In recent years, as the cold-producing medium for refrigeration machine, air conditioner, freezer etc., R32 system Cryogen attracts attention.For R32 cold-producing medium, greenhouse effects value (GWP) of diving is as indoor The cold-producing medium of air regulator etc. and the greenhouse effects of widely used R410a are dived the about 1/3 left of value The right side, ozone-depleting value (ODP) of diving is zero.Thus, according to this R32 cold-producing medium, it is possible to contribute to The reduction of environmental loads.

At present, the coolant compressor of R32 cold-producing medium is employed at patent document 1, patent document 2 It is able to disclosure in Deng, is equipped with the room air conditioner of such coolant compressor without on a large scale Design alteration, efficiency is the most superior.

But, the coolant compressor of patent document 1 with use in R22, R410a and R407c Any one is compared as the coolant compressor of cold-producing medium, and ejection temperature uprises.Specifically, patent The coolant compressor of document 1 is equal with compressor efficiency and employs the coolant compressor phase of R22 Ratio, ejection temperature has uprised about 19 DEG C.Therefore, the coolant compressor of patent document 1 and use The coolant compressor of the cold-producing mediums such as the R22 that the ejection temperature ejection temperature than R32 is low is compared, and deposits It is susceptible to deterioration, it is impossible to the problem guaranteeing long-term reliability at parts or refrigerating machine oil.Especially fill It is the highest more easy to there is ejection temperature in the demagnetization force of the air compressor motor entered in coolant compressor The trend reduced.

In contrast, the coolant compressor of patent document 2 is by reducing being dried of compressor suction side Degree suppresses to spray temperature and rises.Incidentally, if dry in compressor suction side of R32 cold-producing medium Dry degree is more than 0.60, then the reliability of compressor just reaches the level that can use.

But, in the coolant compressor of patent document 2, in the case of for screw compressor, draw Play the liquid compression that liquid refrigerant is compressed, compression mechanical part may be caused because of overload now Damage.

On the other hand, it is currently known and arranges discharge chambe and ejection on the base plate on fixed eddy plate top The screw compressor (for example, referring to patent document 3) of the relief valve device that pressure chamber is connected.

In the screw compressor of such band relief valve device, if the pressure in discharge chambe is at cold-producing medium The midway of compression section become more than ejection pressure, then by opening the relief valve of relief valve device Gas after boosting or liquid refrigerant are discharged to ejection pressure chamber in discharge chambe.

Thus, according to the screw compressor of this band relief valve device, it is believed that even if applying described R32 cold-producing medium, it is also possible to avoid the damage etc. of described compression mechanical part.

[citation]

[patent document]

[patent document 1] Japanese Unexamined Patent Publication 2001-115963 publication

No. 03956589 publication of [patent document 2] Japanese Patent No.

[patent document 3] Japanese Unexamined Patent Publication 2002-221171 publication

But, in the screw compressor (example of the existing band relief valve device employing R32 cold-producing medium As, with reference to patent document 3) in, if making the aridity of compressor suction side reduce as described above, Then liquid refrigerant or the such liquid material of refrigerating machine oil can be a large amount of in this compressor at short notice Flow into.Further, the substantial amounts of liquid material of inflow sometimes at the roll bending partial stagnation of convolution whirlpool dish, and It is detained to pipe portion more by the upstream than suction inlet.Further, to flow into due to this liquid material etc. stagnated It is applied to circle round whirlpool dish and the overload on the engaging piece of fixed eddy plate during discharge chambe, is likely to result in pressure The damage of contracting mechanism part.

Summary of the invention

Therefore, the problem of the present invention is that offer one can be at the liquid such as liquid refrigerant, refrigerating machine oil Shape thing prevents the scroll compression of the damage of compression mechanical part at short notice in compressor during a large amount of inflow Contracting machine.

The screw compressor of the present invention solving described problem is characterised by possessing: the fixing whirlpool of storage Dish and the closed container of convolution whirlpool dish；So that the suction of the working fluid being formed on described fixed eddy plate The mode that mouth connects with the ejiction opening of the working fluid being formed on described fixed eddy plate is formed at described The working fluid path of the scroll on fixed eddy plate；By described fixed eddy plate and described convolution whirlpool dish Engage and be formed at the discharge chambe in described working fluid path；With via described ejiction opening with described The ejection pressure chamber that the mode of discharge chambe connection is arranged in described closed container；It is arranged in described fixing whirlpool On dish, open so that described working fluid when the pressure ratio set pressure height of described working fluid path The relief valve device that path connects with described ejection pressure chamber, fixing relative to described at described convolution whirlpool dish When whirlpool dish carries out circling round and being compressed working fluid in described discharge chambe, release described at least one Put valve gear to configure towards described suction inlet all the time via described working fluid path.

[invention effect]

In accordance with the invention it is possible to offer one can in the liquid material such as liquid refrigerant, refrigerating machine oil in short-term In prevent the screw compressor of damage of compression mechanical part when being flowed in a large number in compressor.

Accompanying drawing explanation

Fig. 1 is that the cross-sectional of the compression mechanical part of the screw compressor corresponding with the I-I section of Fig. 2 regards Figure.

Fig. 2 is the longitudinal section of the screw compressor that embodiments of the present invention relate to.

Fig. 3 (a) is to represent in the outer circumferential side of roll bending of convolution whirlpool dish and formation between fixed eddy plate The schematic diagram of discharge chambe, (b) be represent convolution whirlpool dish roll bending inner circumferential side and with fixing whirlpool The schematic diagram of the discharge chambe formed between dish.

Fig. 4 is the top view of the fixed eddy plate of the screw compressor of Fig. 2.

Fig. 5 is the sectional view of the relief valve device corresponding with the V-V section of Fig. 4, and (a) is to represent The sectional view of the relief valve device of closed mode, (b) is the cuing open of relief valve device representing open mode View.

Fig. 6 is the partial enlarged drawing in the VI portion of Fig. 1, is the movement that the roll bending than convolution whirlpool dish is described The figure of the position of the relief valve device that scope also configures by suction inlet.

Fig. 7 is the partial enlargement of other example of the position representing the relief valve device by suction inlet configuration Figure.

Fig. 8 is the partial enlargement of other example of the position representing the relief valve device by suction inlet configuration Figure.

Fig. 9 (a) is the stereogram of other example of the position representing the relief valve device by suction inlet configuration, B () is the top view of (a).

Figure 10 is the longitudinal section of the first variation representing relief valve device.

Figure 11 is the longitudinal section of the second variation representing relief valve device.

[symbol description]

1 screw compressor

2 closed containers

2f sprays pressure chamber

3 compression mechanical parts

4 motor

5 fixed eddy plates

5a suction inlet

5b scroll gas passage (the working fluid path of scroll)

5c fixed eddy plate roll bending

5e ejiction opening

6 convolution whirlpool dishes

Plate is coiled in 6a convolution whirlpool

10 suction chambers

11 discharge chambes

15 relief valve devices

15a release aperture

15b valve seat

15c discharges valve chamber

15d relief valve

15e force application component

15f guiding elements

15g drain hole

15h valve pressing body

15i discharges stream

16 baffle plates

Detailed description of the invention

Then, come the most referring to the drawings embodiments of the present invention are illustrated.

Fig. 1 is that the cross-sectional of the compression mechanical part of the screw compressor corresponding with the I-I section of Fig. 2 regards Figure.Fig. 2 is the longitudinal section of the screw compressor that embodiments of the present invention relate to.

As shown in Figures 1 and 2, screw compressor 1 of the present embodiment is characterised by, Convolution whirlpool dish 6 carry out circling round relative to fixed eddy plate 5 and in discharge chambe 11 to working fluid ( In present embodiment, it is assumed that for containing ether system or the R32 cold-producing medium of ester system refrigerating machine oil) it is compressed Time, the suction inlet 5a configuration of at least one relief valve device 15 Workflow-oriented body all the time.Here, After the overall structure of screw compressor 1 is illustrated, relief valve device 15 and relief valve are filled Put the configuration of 15 to illustrate.

(overall structure of screw compressor)

As in figure 2 it is shown, screw compressor 1 is made up of the hermetic type screw compressor of high pressure chest mode, Fortune in the broad range used in a part for the kind of refrigeration cycle as room air conditioner etc. Use under the conditions of Zhuaning.Screw compressor 1 possesses: have convolution whirlpool dish 6 and the compression of fixed eddy plate 5 Mechanism part 3；Drive the motor 4 of this compression mechanical part 3；It is accommodated with compression mechanical part 3 and electronic The closed container 2 of the tubular lengthwise of machine 4.It should be noted that compression mechanical part 3 is arranged in airtight Top in container 2, motor 4 is arranged in the bottom in closed container 2.Further, in airtight appearance Bottom in device 2 is stored with refrigerating machine oil 13.

Closed container 2 is by welding lid chamber 2b and bottom cavity 2c up and down and structure at cylindric housing 2a Become.Lid chamber 2b is provided with suction line 2d.Symbol 8 represents check valve.Side at housing 2a Face is provided with discharge pipe 2e.Inner Constitution ejection pressure chamber 2f of closed container 2.

Suction line 2d is used for from the upper surface part of closed container 2 this closed container 2 through will refrigeration Agent gas guides to the suction side of compression mechanical part 3.Discharge pipe 2e with the spray in closed container 2 The mode going out the connection of pressure chamber 2f is connected to the side of closed container 2.

Compression mechanical part 3 possesses: erect the fixed eddy plate roll bending being provided with scroll on platen 5d The fixed eddy plate 5 of 5c；On platen 6d erect be provided with scroll convolution whirlpool coil plate 6a return Vortex dish 6；Integrated with fixed eddy plate 5 by fastening member etc. and convolution whirlpool dish 6 is supported Framework 9.

It should be noted that in fig. 2, symbol 11 expression is formed at fixed eddy plate roll bending 5c and returns Vortex coil between plate 6a, at the discharge chambe of working fluid of rear detailed description, symbol 5e represents Make the working fluid after being compressed by discharge chambe 11 to the ejiction opening of ejection pressure chamber 2f ejection.

As it is shown in figure 1, be provided with on fixed eddy plate 5 and suction inlet 5a and ejection pressure chamber 2f (reference The scroll gas passage 5b (the working fluid path of scroll) Fig. 2) communicated, this scroll gas Body path 5b becomes scroll by fixed eddy plate roll bending 5c.And shape opposed with this fixed eddy plate 5 Become the most discoid described convolution whirlpool dish 6 (with reference to Fig. 2) to be configured to circle round freely.As above institute State, the convolution whirlpool of the upper surface being arranged on convolution whirlpool dish 6 coil plate 6a with fixed eddy plate roll bending 5c The mode of engagement configures.

Coil between plate 6a at fixed eddy plate roll bending 5c and convolution whirlpool, roll up according to relative to fixed eddy plate The convolution whirlpool that plate 5c carries out circling round is coiled the position of plate 6a and is formed discharge chambe 11.

Further, the discharge chambe 11 in present embodiment be formed at convolution whirlpool coil plate 6a outer circumferential side and Inner circumferential side.

Fig. 3 (a) is to represent in the outer circumferential side of roll bending of convolution whirlpool dish and formation between fixed eddy plate The schematic diagram of discharge chambe, Fig. 3 (b) be represent convolution whirlpool dish roll bending inner circumferential side and with solid The schematic diagram of the discharge chambe formed between static vortex disk.

Discharge chambe 11 in present embodiment coils plate 6a's in convolution whirlpool as shown in Fig. 3 (a) Outer circumferential side and formation between fixed eddy plate 5, and, in convolution whirlpool as shown in Fig. 3 (b) Coil the inner circumferential side of plate 6a and formed between fixed eddy plate 5.

It should be noted that the center side at fixed eddy plate 5 forms ejiction opening 5e, described suction inlet 5a is formed at the outer circumferential side of fixed eddy plate 5.

It addition, in the present embodiment, coil, in convolution whirlpool, the discharge chambe that the outer circumferential side of plate 6a is formed Closing of the working fluid of 11 (with reference to Fig. 3 (a)) coils the inner circumferential side of plate 6a into volumetric ratio in convolution whirlpool Closing into volume of the working fluid of the discharge chambe 11 (with reference to Fig. 3 (b)) formed is big.

According to such screw compressor 1 (with reference to Fig. 2) of the present embodiment, it is possible to will be from suction The working fluid that entrance 5a sucks period efficiency till spraying to ejiction opening 5e is pressed well Contracting.

Again returning to Fig. 2, fixed eddy plate 5 is fixing on the frame 9 by bolt B 1, framework 9 Outer circumferential side is fixed by welding on the internal face of closed container 2.Further, fixed eddy plate 5 sets There is the relief valve device 15 in rear detailed description.Possess on the frame 9 and bent axle 7 is supported as rotating from As base bearing 9a.Lower face side at convolution whirlpool dish 6 is linked with the eccentric part 7b of bent axle 7.

It is configured with European ring 12, European ring 12 between lower face side and the framework 9 of convolution whirlpool dish 6 It is installed in the groove that the lower face side at convolution whirlpool dish 6 formed and the groove formed on the frame 9.It addition, This European ring 12 plays the eccentric rotary of the eccentric part 7b bearing bent axle 7 and makes convolution whirlpool dish 6 not The effect of revolution motion is carried out in the case of rotation.

Motor 4 possesses fixture 4a and revolving part 4b.Fixture 4a is fastened to close by press-in etc. Close on container 2.Revolving part 4b is configured to rotate in fixture 4a.Motor 4 is via solid The bent axle 7 that is scheduled on revolving part 4b and make convolution whirlpool dish 6 carry out circumnutation.

Bent axle 7 possesses main shaft part 7a and described eccentric part 7b, and by the master arranged on the frame 9 Bearing 9a and lower bearing 17 support.Eccentric part 7b eccentric relative to main shaft part 7a of bent axle 7 and one Body ground is formed, and chimeric with the convolution bearing (omitting diagram) on the back side being arranged on convolution whirlpool dish 6. Bent axle 7 is driven by the driving of motor 4, and eccentric part 7b is relative to the main shaft part of bent axle 7 7a carries out eccentric rotational motion, thus is driven back to vortex dish 6.It addition, bent axle 7 is provided with therein The confession that refrigerating machine oil 13 is guided to base bearing 9a, lower bearing 17 and convolution bearing (omitting diagram) Oil path 7c, and the axle head in motor 4 side be provided with absorption refrigerating machine oil 13 and by it to fuel feeding The fuel feed pump 7d that path 7c guides.

Be formed between rear side and the framework 9 of convolution whirlpool dish 6 pressure becoming suction line 2d with The middle pressure chamber 14 of the intermediate pressure of the pressure of ejection pressure chamber 2f.This middle pressure chamber 14 is formed at close Close the refrigerating machine oil 13 in container 2 to the midway, path that the sliding part of compression mechanical part 3 supplies.Suitable Band is said, be stored in closed container 2 bottom refrigerating machine oil 13 by this middle pressure chamber 14 with Ejection pressure chamber 2f pressure differential and via bent axle 7 central part formed fuel feeding path 7c to main shaft Hold the supplies such as 9a.

In such screw compressor 1, by make motor 4 revolving part 4b rotate and via Bent axle 7 makes convolution whirlpool dish 6 carry out circumnutation.Thus, the working fluid sucked from suction line 2d Via check valve 8 and suction inlet 5a (with reference to Fig. 1) by scroll gas passage 5b (ginseng According to Fig. 1) send into.In the 5b of this scroll gas passage, as it is shown in figure 1, at fixed eddy plate roll bending 5c and convolution whirlpool are coiled and are formed described discharge chambe 11 between plate 6a.

By making convolution whirlpool dish 6 carry out revolution fortune relative to fixed eddy plate 5 in the case of not rotation Dynamic, thus working fluid is sucked to the suction chamber 10 shown in Fig. 1 from suction inlet 5a.On the other hand, Discharge chambe 11 shown in Fig. 1 is coiled the revolution motion of plate 6a along with this convolution whirlpool and is leaned on ectocentral spray Outlet 5e.

Discharge chambe 11 more reduces closer to the ejiction opening 5e of central authorities, the volume of discharge chambe 11.That is, pressure The working fluid of contracting room 11 is compressed.Further, the mobile position to the ejiction opening 5e towards central authorities Discharge chambe 11 by the working fluid after compression via ejiction opening 5e ejection pressure in closed container 2 Room 2f (with reference to Fig. 2) ejection.These working fluids sprayed are by framework 9 (with reference to Fig. 2) The path that arranges of periphery and be directed downward, after cooling motor 4 (with reference to Fig. 2), from Discharge pipe 2e (with reference to Fig. 2) send in the kind of refrigeration cycle of the outside of closed container 2 (with reference to Fig. 2) Go out.

On the other hand, the suction chamber 10 of the scroll gas flow path 5b shown in Fig. 1 is by convolution whirlpool dish The revolution motion of roll bending 6a sucks working fluid, forms discharge chambe 11 afterwards and is closed by working fluid Enter and coil between plate 6a to fixed eddy plate roll bending 5c and convolution whirlpool, and, close into discharge chambe 11 In working fluid as described above by compression to central authorities ejiction opening 5e spray.

It should be noted that in FIG, symbol 15a represents relief valve device 15 (with reference to Fig. 2) Release aperture described later.

(relief valve device)

Then, relief valve device 15 is illustrated.Fig. 4 is the fixing of the screw compressor of Fig. 2 The top view of whirlpool dish.

As shown in Figure 4, relief valve device 15 be formed on compression mechanical part 3 (with reference to Fig. 2) Multiple discharge chambes 11 (with reference to Fig. 1) are corresponding and are arranged on multiple positions of fixed eddy plate 5.So Relief valve device 15 for the pressure in discharge chambe 11 more than set pressure big time from discharge chambe 11 To ejection pressure chamber 2f (with reference to Fig. 2) ejection working fluid.

It should be noted that in the diagram, symbol 5e represents that ejiction opening, symbol 16 represent described later Baffle plate.

Referring next to Fig. 5 be the sectional view of the relief valve device corresponding with the V-V section of Fig. 4, A () is the sectional view of the relief valve device representing closed mode, (b) is to represent releasing of open mode Put the sectional view of valve gear.

As shown in Fig. 5 (a) and (b), relief valve device 15 possess be arranged in release stream 15i in Relief valve 15d and valve pressing body 15h, be arranged in the baffle plate 16 of the upper surface of fixed eddy plate 5.

Release stream 15i is with by scroll gas passage 5b (with reference to Fig. 1) and ejection pressure chamber 2f (ginseng According to Fig. 2) mode that connects is formed on the platen 5d of fixed eddy plate 5.Stream 15i is by releasing in this release Discharge hole 15a and release valve chamber 15c is constituted.

Release aperture 15a is to scroll gas passage 5b (with reference to Fig. 1) opening.The appearance of release aperture 15a The one of the long-pending volume being formed in the 5b of scroll gas passage the discharge chambe 11 (with reference to Fig. 1) formed Part, and the dead volume that the reflation loss becoming the remaining gas with compression travel is accompanied, because of The volume (internal diameter size or length dimension) of this preferred release aperture 15a is minimum.

Release valve chamber 15c includes: the guiding elements 15f of valve pressing body 15h described later mainly configures Large-diameter portion 15j；Formed less than this large-diameter portion 15j diameter and bigger, towards this than release aperture 15a diameter Release aperture 15a and the minor diameter part 15k that connects with this release aperture 15a.

It should be noted that large-diameter portion 15j connects via tapered portion 15m with minor diameter part 15k.

It is formed by the platform heaved in the form of a ring around release aperture 15a in the bottom of this minor diameter part 15k The valve seat 15b that rank portion is constituted.

This valve seat 15b is configured with relief valve 15d in the way of inaccessible release aperture 15a.This release Valve 15d is formed by discoid steel spring plate etc..

Valve pressing body 15h possesses guiding elements 15f and force application component 15e.

Guiding elements 15f mainly possesses: at the main part of the large-diameter portion 15j configuration of release valve chamber 15c； From this main part, the minor diameter part 15k side to release valve chamber 15c is extended and installs for force application component 15e Generally cylindrical installation portion.

The external diameter of the main part of guiding elements 15f is set such that and is accommodated in release valve chamber at main part Between this main part and this large-diameter portion 15j, there is clearance C 1 during the large-diameter portion 15j of 15c.

It addition, the length of the above-below direction of main part is set to that the degree of depth than large-diameter portion 15j is slightly shorter.That is, As described later, main part is configured under the effect of force application component 15e and baffle plate in large-diameter portion 15j 16 abut, and are formed with clearance C 2 between this main part and tapered portion 15m.

Such guiding elements 15f has multiple drain hole 15g stream as working fluid.

Force application component 15e in present embodiment is formed by helical spring, is formed adjacent at its two ends The contiguity winder touched each other of winding.Further, in the contiguity winder of a side, intercalation has guiding The installation portion of component 15f.It addition, the front end of the contiguity winder of the opposing party be arranged in valve seat 15b On relief valve 15d upper surface abut.It should be noted that the relief valve 15d in present embodiment It is not connected to the front end of the contiguity winder of the opposing party but it also may be configured to touch the front end of winder The structure being connected with relief valve 15d.

According to the force application component 15e being made up of such helical spring, it is possible in the two of contiguity winder The installation portion of the either end intercalation guiding elements 15f in end, therefore assembles easiness superior.It addition, Owing to becoming close contiguity winder intercalation installation portion at winding internal, therefore force application component 15e relative to The mounting stability of guiding elements 15f is superior.

As shown in Figure 4, the baffle plate 16 in present embodiment is to be arranged on fixing whirlpool by bolt B 2 Plate body on the upper surface of the platen 5d of dish 5.Baffle plate 16 is formed and makes relief valve device 15 Drain hole 15g towards ejection pressure chamber 2f (with reference to Fig. 2) opening 16a, make fixed eddy plate 5 Ejiction opening 5e is towards the opening 16b of ejection pressure chamber 2f (with reference to Fig. 2).

As shown in Fig. 5 (a), the edge of the opening 16a of baffle plate 16 with by force application component 15e upwards The upper surface of the valve pressing body 15h in the release valve chamber 15c of side's force abuts.That is, baffle plate 16 exists Valve pressing body 15h movement upward is limited in release valve chamber 15c.Thus, valve pressing body 15h In release valve chamber 15c, it is maintained at the position of regulation, is arranged on the force on this valve pressing body 15h Component 15e be set to relief valve 15d is pressed onto on valve seat 15b by pressure in prescribed limit.

Such baffle plate 16 such as can be manufactured by the stamping processing of steel plate.

In relief valve device 15, in the system enclosing screw compressor 1 of the present embodiment When generally operating of SAPMAC method (such as room air conditioner etc.), as shown in Fig. 5 (a), release Valve 15d is arranged on valve seat 15b in the way of inaccessible release aperture 15a, the force of valve pressing body 15h Relief valve 15d is pressed towards valve seat 15b by component 15e with the active force (by pressure) of regulation.That is, When generally operating, the working fluid of discharge chambe 11 compression as shown in Figure 1 is not via being released valve Release aperture 15a that 15d (with reference to Fig. 5 (a)) is inaccessible, and via at fixed eddy plate 5 (with reference to Fig. 2) The ejiction opening 5e (with reference to Fig. 2) being centrally formed to ejection pressure chamber 2f (with reference to Fig. 2) ejection.

On the other hand, the pressure in discharge chambe 11 (with reference to Fig. 1) becomes more than ejection pressure, enters Specifically, the pressure in discharge chambe 11 becomes ratio and sets pressure (ejection pressure+release one step The elasticity of the weight of valve 15d+force application component 15e presses pressure) big time, as shown in Fig. 5 (b), close Relief valve 15d active force (by pressure) overcoming force application component 15e having filled in release aperture 15a etc. and Lifted upward.As a result of which it is, the working fluid such as Fig. 5 (b) in discharge chambe 11 (with reference to Fig. 1) Via release aperture 15a, release valve chamber 15c and opening 16a to ejection pressure as shown in hollow core arrow Room 2f (with reference to Fig. 2) ejection.

Further, at the pressure of discharge chambe 11 (with reference to Fig. 1) to ejection pressure chamber 2f ejection working fluid During less than described setting pressure, force application component 15e replys as shown in Fig. 5 (a), and relief valve 15d is the most inaccessible by release aperture 15a.

(configuration of relief valve device)

Then, to the position configuring relief valve device 15 on fixed eddy plate 5 in the present embodiment Illustrate.

As it is shown in figure 1, relief valve device 15 (release aperture 15a) is along being formed with discharge chambe 11 Scroll gas passage 5b and be configured with multiple.If the brightest, scroll gas leads to Road 5b with by fixed eddy plate 5 the ejiction opening 5e being centrally formed with than this ejiction opening 5e by fixing The suction inlet 5a formed outside the radial direction of whirlpool dish 5 is in the scroll phase centered by ejiction opening 5e Mode even extends, and relief valve device 15 (release aperture 15a) is along at suction inlet 5a and ejiction opening The bearing of trend of scroll gas passage 5b that extends between 5e and be configured with multiple.

Relief valve device 15 (release aperture 15a) as described above, at least one relief valve device 15 (release aperture 15a) via scroll gas passage 5b all the time towards suction inlet 5a (with reference to Fig. 1) Configuration.Further, in the present embodiment, in multiple relief valve devices 15 (release aperture 15a) extremely A few suction inlet 5a configuration by scroll gas passage 5b.

Fig. 6 is the partial enlarged drawing in the VI portion of Fig. 1, is the movement that the roll bending than convolution whirlpool dish is described The figure of the position of the relief valve device that scope is more formed by suction inlet.

As shown in Figure 6, relief valve device 15 (release aperture 15a) is when the whirlpool dish 6 that circles round circles round Moving range L coiling plate 6a than this convolution whirlpool more configures by suction inlet 5a, and by fixed eddy plate The interior lines 5f configuration of 5.

Here, relief valve device 15 (release aperture 15a) " is more joined by suction inlet 5a than moving range L Put " mean that the convolution whirlpool of no matter movement in moving range L is coiled the position of plate 6a and how to be changed, The opening of release aperture 15a at least some of via scroll gas passage 5b and suction inlet 5a all the time Connection.In other words, as shown in Figure 6, a part for the opening of release aperture 15a can also be with mobile model Enclose L overlapping.

It addition, configured by the interior lines 5f of fixed eddy plate 5 by relief valve device 15 (release aperture 15a), The advantage thus with the area that can reduce baffle plate 16.

Further, in the relief valve device of multiple formation 15 (with reference to Fig. 1), by suction inlet 5a shape The center (center of release aperture 15a under top view) of the relief valve device 15 (with reference to Fig. 6) become It is positioned at when circling round moving range L at the place, end of its suction inlet 5a side than convolution whirlpool dish 6 more by suction The position of entrance 5a.

Then, the action effect of screw compressor 1 of the present embodiment is illustrated.

In screw compressor 1 as above, in working fluid (the R32 system containing refrigerating machine oil Cryogen) become generally operating of below setting pressure by the pressure in discharge chambe 11 during compression Time, close release aperture 15a (with reference to Fig. 5 (a)) by relief valve 15d.Thus, working fluid Will not be via relief valve device 15 to ejection pressure chamber 2f ejection when generally operating.

On the other hand, according to the operational situation of room air conditioner etc., at working fluid (containing system The refrigerant gas of cold oil or liquid refrigerant) by the pressure in discharge chambe 11 during compression When exceeding setting pressure (during overcompression operating), the pressure of discharge chambe 11 becomes than ejection pressure chamber 2f Pressure high, under the effect of this pressure differential relief valve 15d from valve seat 15b leave and by release aperture 15a Open (with reference to Fig. 5 (b)).The discharge chambe of release aperture 15a is have passed through because of opening of release aperture 15a Working fluid in 11 flows towards the direction shown in the hollow arrow of Fig. 5 (b) and arrives ejection pressure Room 2f.By such relief valve device 15, it is possible to prevent overcompression loss or fixed eddy plate roll bending The damage of plate 6a is coiled in 5c and convolution whirlpool.

It addition, in screw compressor 1 (with reference to Fig. 2) of the present embodiment, in order to reduce Environmental loads and use R32 cold-producing medium.Further, in this screw compressor 1, and R32 is employed The existing screw compressor of cold-producing medium is compared, in order to ensure long-term reliability, being dried suction side Degree is set to the relatively low temperature reducing ejection side.Thus, at substantial amounts of liquid refrigerant or refrigeration machine In the case of oil was flowed in screw compressor 1 within suction line 2d (with reference to Fig. 2) short time, In existing whirlpool plate compressor (for example, referring to patent document 3), exist and formed because of this hydraulic pressure In suction chamber before discharge chambe, pressure exceedes the situation setting pressure.In contrast, according to this embodiment party The whirlpool plate compressor 1 that formula relates to, as shown in Figure 6, is filled by the relief valve arranged by suction inlet 15a Put 15 (release aperture 15a), it is possible to liquid refrigerant or refrigerating machine oil are sprayed to ejection pressure chamber 2f, Therefore, it is possible to prevent because of be applied to fixed eddy plate roll bending 5c and convolution whirlpool coil the overload on plate 6a and The damage of the compression mechanical part 3 caused.

It addition, according to screw compressor 1 of the present embodiment, (released by relief valve device 15 Discharge hole 15a), it is possible to liquid refrigerant or refrigerating machine oil are sprayed to ejection pressure chamber 2f, therefore can also The circulation enough making the cold-producing medium of liquid condition or refrigerating machine oil is smooth and easy, prevents pipe or the damage of valve, thus Improve the reliability of screw compressor 1.

Above embodiments of the present invention are illustrated, but the invention is not limited in described enforcement Mode, can implement in every way.

Referring next to Fig. 7, Fig. 8 and Fig. 9 (a) and (b) be represent by suction inlet configure The figure of other example of position of relief valve device.Figure 10 is the first deformation representing relief valve device The longitudinal section of example.Figure 11 is the longitudinal section of the second variation representing relief valve device.

In said embodiment, by the relief valve device 15 (release aperture 15a) of suction inlet 5a configuration Interior lines 5f by fixed eddy plate roll bending 5c configures, but in the present invention, as shown in Figure 7, it is also possible to Outside line 5g by fixed eddy plate roll bending 5c configures.

According to such relief valve device 15 (release aperture 15a), make to become with the distance of suction inlet 5a Bigger, it is possible to prevent the formation etc. in release stream 15i (with reference to Fig. 5 (a)) from adding fixed eddy plate in man-hour The deformation of 5.It should be noted that in the figure 7, symbol 5f represents the interior lines of fixed eddy plate 5, symbol Number L represents the moving range at its place, end when convolution whirlpool dish 6 circles round.

It addition, as shown in Figure 8, relief valve device 15 (release aperture 15a) can also be arranged in scrollwork The width central authorities of shape gas passage 5b.It should be noted that in fig. 8, symbol 5a represents Suction inlet, symbol 5g represents that the outside line of fixed eddy plate 5, symbol L represent when convolution whirlpool dish 6 circles round The moving range at its place, end.According to this relief valve device 15 (release aperture 15a), due to release Hole 15a is arranged in the width central authorities of scroll gas passage 5b, and therefore liquid refrigerant etc. hold Easily flow to release aperture 15a, it is possible to via relief valve device 15 (release aperture 15a) by liquid system Cryogens etc. are effectively discharged out.

It addition, in said embodiment, at least one relief valve device 15 is joined by suction inlet 5a Put, but in the present invention, it is also possible to by least one relief valve device 15 via scroll gas flow path 5b and all the time towards suction inlet 5a configure.

Thus, as shown in Fig. 9 (a) and (b), it is also possible to be configured to, returning by suction inlet 5a Vortex dish 6 part, inner circumferential side and the outer circumferential side of coiling plate 6a in convolution whirlpool form discharge chambe 11 respectively (with reference to Fig. 3 (a) and (b)) in the range of, with at least one party's (release aperture 15a) all the time with suction The mode of entrance 5a connection coils the inner circumferential side of plate 6a in convolution whirlpool and outer circumferential side is respectively configured relief valve Device 15 (release aperture 15a).

It addition, in this case, the preferably periphery at suction inlet 5a arranges and digs portion 5h.Such The portion 5h of digging is capable of when cold-producing medium etc. flows via relief valve device 15 (release aperture 15a) Stream loss reduces.

It should be noted that in Fig. 9 (a) and (b), symbol 5 represents fixed eddy plate.

It addition, in said embodiment, baffle plate 16 is with the upper table with the platen 5d of fixed eddy plate 5 The mode that face abuts is installed, but the present invention is as shown in Figure 10, it is also possible to be configured to baffle plate 16 fixing The upper surface of the platen 5d of whirlpool dish 5 separates gap configuration.

It should be noted that in Fig. 10, symbol 15a represents that release aperture, symbol 15c represent to be released Putting valve chamber, symbol 15d represents that relief valve, symbol 15e represent that force application component, symbol 15f represent and draw Leading component, symbol 15g represents that drain hole, symbol 15i represent release stream.According to such baffle plate 16, it is possible to shift motion during relief valve 15d opening and closing is guaranteed bigger.

It addition, in said embodiment, it is configured with in release stream 15i (with reference to Fig. 5 (a)) Relief valve 15d (with reference to Fig. 5 (a)), but the present invention is as shown in figure 11, it is also possible to discharge with obturation The mode of the upper side opening of stream 15i arranges spring tabular at the upper surface of the platen 5d of fixed eddy plate 5 Relief valve 15d, using the one side of this relief valve 15d as the periphery of opening at release stream 15i Fixing relief valve device 15.Further, in this relief valve device 15, it is possible to be arranged in release stream Turn back the baffle plate 16 of such shape in the top of the upper side opening of road 15i.Such baffle plate 16 can be Turned back by relief valve 15d and open the degree of turning back of release stream 15i limit this relief valve 15d.

Claims (5)

1. a screw compressor, it is characterised in that possess:

Storage fixed eddy plate and the closed container of convolution whirlpool dish；

So that the suction inlet of the working fluid being formed on described fixed eddy plate be formed at described fixing The mode of the ejiction opening connection of the working fluid on the dish of whirlpool is formed at the scroll on described fixed eddy plate Working fluid path；

Engaged with described convolution whirlpool dish by described fixed eddy plate and be formed at described working fluid path In discharge chambe；

It is arranged on described closed container in the way of connecting with described discharge chambe via described ejiction opening Interior ejection pressure chamber；

It is arranged on described fixed eddy plate, when the pressure ratio set pressure height of described working fluid path Open so that the relief valve device that connects with described ejection pressure chamber of described working fluid path,

Described convolution whirlpool dish carry out circling round relative to described fixed eddy plate and in described discharge chambe right When working fluid is compressed, at least one described relief valve device begins via described working fluid path Configure towards described suction inlet eventually,

Further, at least one described relief valve device is closer to the described suction of described working fluid path Mouthful configuration, and the center that the described relief valve device configured closer to described suction inlet is under top view It is positioned at the mobile model at the place, end of the suction inlet side of this convolution whirlpool dish when circling round than described convolution whirlpool dish Enclose the position closer to described suction inlet.

Screw compressor the most according to claim 1, it is characterised in that

Described discharge chambe is by making roll bending and the described convolution whirlpool dish of the scroll of described fixed eddy plate The roll bending of scroll engages and is formed,

Outer circumferential side at the described roll bending of described convolution whirlpool dish is formed at the described roll bending of this convolution whirlpool dish And closing into volumetric ratio in described convolution of the described discharge chambe between the described roll bending of described fixed eddy plate Closing into volume of the described discharge chambe that the inner circumferential side of the described roll bending of whirlpool dish is formed is big.

Screw compressor the most according to claim 1, it is characterised in that

Described relief valve device has: the release stream connected with described ejection pressure chamber by described discharge chambe Road；Described release stream is carried out the relief valve of opening and closing；It is arranged in the top of described relief valve and to institute State relief valve and apply elastic by the valve pressing body of pressure；Limit the gear of the moving range of described valve pressing body Plate.

Screw compressor the most according to claim 1, it is characterised in that

Described relief valve device has: the release stream connected with described ejection pressure chamber by described discharge chambe Road；Described release stream is carried out opening and closing, and is arranged on the bullet of the plate upper surface of described fixed eddy plate The relief valve of spring plank shape；Limit the baffle plate of the moving range of described relief valve.

Screw compressor the most according to claim 1, it is characterised in that

Described relief valve device is arranged in the width central authorities of described working fluid path.