CN2714848Y

CN2714848Y - Scroll compressor

Info

Publication number: CN2714848Y
Application number: CNU2004200033365U
Authority: CN
Inventors: 上川隆司
Original assignee: Daikin Industries Ltd
Current assignee: Daikin Industries Ltd
Priority date: 2003-02-03
Filing date: 2004-02-03
Publication date: 2005-08-03
Anticipated expiration: 2014-02-03
Also published as: JP2004239070A; JP4222044B2; CN1651768A; CN100412381C

Abstract

The utility model relates to a scroll compressor, in particular that the utility model relates to a scroll compressor which can adopt the measure to prevent the overhigh exhaust temperature from causing bad lubrication. The scroll compressor of the utility model can not cause the result of bad lubrication even if the exhaust temperature rises in some degree, and the scroll compressor can continue operating. The oil supply passage 49 of the utility model supplies lubrication oils stored in the compressor housing 11 to a compressing mechanism 15. The end plate 22a of a rotary scroll disc 22 is provided with a lubrication oil passage 51 which is communicated with the oil supply passage 49 and has an opening near the center end of a scroll ring 22b. The inner of the lubrication oil passage 51 is provided with a valve component 55 made of bimetals, and a spring component which presses the valve component 55 on the lubrication oil passage 51. During the condition of evacuation operating, when the exhaust temperature is overhigh, the valve component 55 deforms and admits lubrication oils to flow to a compression chamber 37. The scroll compressor of the utility model can be used for compressors for compressing the cryogen.

Description

Scroll compressor

Technical field

The utility model relates to scroll compressor, particularly, is related to and prevents that the insufficient lubrication that causes owing to excessive discharge temperature from taking the scroll compressor of corresponding measure.

Background technique

In the past, using scroll compressor as the compressor that comes compression refrigerant gas with refrigeration cycle always.This scroll compressor has fixed scroll and rotation scroll in casing.These two kinds of scroll have end plate respectively, and protrude the Vorticose vortex circle that is arranged on this end plate.Fixed scroll is fixed on the casing, and the rotation scroll is connected on the eccentric part of live axle, can revolve round the sun.The vortex circle of this rotation scroll does not carry out rotation under the state that the vortex circle with fixed scroll meshes, only revolve round the sun.Like this, formed pressing chamber just can dwindle continuously between two scroll, with the gas in the compression pressing chamber.

, in above-mentioned scroll compressor, for example,, recognized that the temperature of the fluid of discharging from pressing chamber can excessively raise as disclosing in the patent documentation 1 (No. 3084105 patent gazette).That is, for example, the expansion valve in cryogen circuit is in closed condition, and compressor is found time under the situations such as running, and the temperature of the refrigerant of discharge will raise unusually.This be because, under the also still very high situation of the pressure of the exhaust side of compressor, just the pressure of suction side is lowered, compare when making compression ratio, unusually the cause of Zeng Daing with usual running.

And when the temperature anomaly of the refrigerant of discharging raise, the vortex circle of scroll was wanted thermal expansion, and it is excessive that the surface pressure between its top end and the end plate just becomes, and vortex circle and end plate just may wear and tear or damage.In addition, the frictional heat that produces owing to the slide relative between the vortex circle has increased, and is superimposed with the rising of delivery temperature, and oily temperature just rises, and impels the lubricant oil of refrigerating machine to become bad, may become the reason of insufficient lubrication.

In order to solve this problem that produces owing to unusual intensification, in the scroll compressor that in above-mentioned patent documentation 1, is disclosed, the hyperthermia induced cryogen of discharging by means of making leaks in the low-pressure section that is provided with drive motor, this drive motor is heated up, thereby stop compressor operation.

Specifically, in this compressor,, and in this low-pressure section, drive motor is set in the inner low-pressure section that forms the low-pressure refrigerant that is full of suction of casing.On the other hand, the bifurcated passage that is communicated with low-pressure section is connected on the exhaust passage of the flow of refrigerant of discharging from pressing chamber.On the attachment portion of the bifurcated passage on this exhaust passage, be provided with the valve of dual metal type.When the excessive temperature of the refrigerant of discharging rose, this dual metal type valve was just opened.Like this, when the excessive temperature of the refrigerant of discharging rose, the dual metal type valve was just worked, and the hyperthermia induced cryogen guiding low-pressure section with discharging rises the temperature of drive motor.Then, the temperature that the temperature transducer that the protection motor is used detects drive motor has risen, and compressor is shut down, thereby avoided compressor to remain in operation under the very high state of delivery temperature.

, the compressor in the past that is disclosed in above-mentioned communique because its structure is when delivery temperature excessively rises, just makes drive motor stop operating, so exist the problem that needs a very long time till finding time to finish.In addition, because compressor starts repeatedly and stops, may damaging the reliability of compressor.

Summary of the invention

Therefore, the utility model because above this some and put forward, its objective is provides a kind of like this scroll compressor, promptly, even under delivery temperature is brought up to a certain degree state, also can not cause insufficient lubrication, scroll compressor still can remain in operation.

For achieving the above object, in the utility model, on end plate 21a, the 22a of at least one scroll of

scroll

21,22, has following each several part: grease channel 51, it when being communicated with oil supply gallery 49 to compressing mechanism 15 supplying lubricating oils, near the opening end, center of

vortex circle

21b, 22b; And valve part 55, this valve part is out of shape along with the temperature of the fluid that is compressed by compressing mechanism 15, when the temperature of this fluid surpasses specified value, because the lubricant oil circulation in above-mentioned grease channel 51 is just allowed in above-mentioned distortion.

Specifically, the basis of first model utility is a kind of scroll compressor, and it has following parts: casing 11; Compressing mechanism 15, it is arranged in the said machine casing 11, has the Vorticose vortex circle 21b that is vertically set on end plate 21a, the 22a, a pair of

scroll

21,22 of 22b; And be used for being supplied to the oil supply gallery 49 of above-mentioned compressor structure 15 with being stored in lubricant oil in the said machine casing 11.In addition, have at least end plate 21a, a 22a on the scroll to have following parts in the above-mentioned scroll 21,22: grease channel 51, it is made and can be communicated with above-mentioned oil supply gallery 49, and mouth is opened near the end, center of above-mentioned

vortex circle

21b, 22b; Valve part 55, this valve part be along with being out of shape by the temperature of the fluid that above-mentioned compressor structure 15 compressed, and only during more than or equal to specified value, allows that lubricant oil circulates in the temperature of this fluid in above-mentioned grease channel 51.

In addition, second model utility is on the basis of first model utility, and valve part 55 usefulness bimetals are made, and is arranged to contact with the fluid that is compressed with compressing mechanism 15.

In addition, the 3rd model utility is on the basis of first or second model utility, have on end plate 21a, the 22a of valve part 55, be provided with to pushing down the spring members 57 of these valve part 55 usefulness, on the one hand, when above-mentioned valve part 55 under dull and stereotyped state, push down by above-mentioned spring members 57, when covering above-mentioned grease channel 51, stop lubricant oil in this grease channel 51, to circulate, on the other hand, overcome the pressure of above-mentioned spring members 57 when above-mentioned valve part 55, when being in bent state, allow the lubricant oil circulation in the above-mentioned grease channel 51.

In addition, the 4th model utility is on the basis of the first or second or the 3rd model utility, on the rotation scroll 22 in a pair of

scroll

21,22, side opposite at end plate 22a with vortex circle 22b is arranged, formation is protruded, the barrel 30 that the eccentric part 17a that forms for the end that is inserted in live axle 17 uses; Grease channel 51 is made the end plate 22a that runs through above-mentioned rotation scroll 22, and mouth is opened towards the inside of barrel 30; Oil supply gallery 49 forms in above-mentioned live axle 17, and mouth is opened towards the end face of eccentric part 17a.

That is, in first model utility, the lubricant oil that is stored in casing 11 inside imports in the compressing mechanism 15 by oil supply gallery 49.In addition, on end plate 21a, the 22a of a

scroll

21,22, be provided with at least and make the grease channel 51 and the valve part 55 that can be communicated with above-mentioned oil supply gallery 49.Grease channel 51 is opening near the end at

vortex circle

21b, 22b center, so can be fed to the lubricant oil in the oil supply gallery 49 near the vortex center part.On the other hand, above-mentioned valve part 55 can be along with being deformed by the temperature of the fluid that compressing mechanism 15 compressed.And this valve part 55 only when the temperature of fluid surpasses the temperature of regulation, is just allowed the lubricant oil circulation in the above-mentioned grease channel 51.

In this first model utility, when the temperature of the fluid after being compressed by compressing mechanism 15 rose to the numerical value that surpasses regulation, the lubricant oil in the oil supply gallery 49 just passed through near the end, center of grease channel 51 inflow vortex circle 21b, 22b.For example, under situations such as the running of finding time, compression ratio has increased, and the temperature anomaly ground of the fluid after being compressed raises.In this state, just distortion of valve part 55 becomes connected state with grease channel 51, and the lubricant oil in the oil supply gallery 49 is just supplied in fluid chamber by grease channel 51.

In addition, in second model utility, valve part 55 is made by bimetal.Fluid with compressing mechanism 15 compressions contacts with this valve part 55.Therefore, for example, under situations such as the running of finding time, when the excessive temperature of the core of the vortex filament of

vortex circle

21b, 22b rises, when surpassing the temperature of regulation, valve part 55 just is out of shape, and lubricant oil just can flow through grease channel 51.Like this, the lubricant oil in the oil supply gallery 49 just can pass through near the vortex filament core of grease channel 51

inflow vortex circle

21b, 22b.

In addition, in the 3rd model utility, valve part 55 is dull and stereotyped state under situations such as usual running, is subjected to the pressure of spring members 57 and covers grease channel 51, stops the lubricant oil in the grease channel 51 to circulate.On the other hand, for example, under such situation such as find time to turn round, when near the fluid temperature (F.T.) vortex circle 21b, the end, 22b center rose to the temperature of the high defined of the temperature that surpasses when turning round than usual, valve part 55 just overcame the pressure of spring members 57 and is bent state.So because the distortion of this valve part 55, the lubricant oil in the grease channel 51 just can circulate.Like this, lubricant oil is just by grease channel 51, flow into from oil supply gallery 49

vortex circle

21b, 22b the vortex filament core near.Then, when the temperature of above-mentioned fluid is reduced to set point of temperature when following, valve part 55 becomes dull and stereotyped state once more.

In addition, in the 4th model utility, the lubricant oil that is stored in the casing 11 flows through the oil supply gallery 49 that is arranged in the live axle 17.Lubricant oil in this oil supply gallery 49, flow out the end face of the eccentric part 17a be positioned at live axle 17 ends after, flow into barrel 30 inside of rotation scroll 22.That is, the lubricant oil in the casing 11 is supplied to compressing mechanism 15.On the other hand, in the inside of barrel 30, an end running through the grease channel 51 of the end plate 21a, the 22a that rotate scroll 22 is an opening.Therefore, when the temperature on the end, center of

vortex circle

21b, 22b rose to the temperature that surpasses regulation, the lubricant oil that flows out from the eccentric part 17a of live axle 17 was through after the inside of barrel 30, flow through grease channel 51, flow near the end, center of

vortex circle

21b, 22b.

As mentioned above, according to the utility model, can obtain following various effect.

In first model utility, when the temperature of the fluid of locating in vortex circle 21b, end, 22b center was too high, lubricant oil just by grease channel 51, was supplied near the end to

vortex circle

21b, 22b center.Like this, even under the state that the surface pressure that makes owing to thermal expansion between

vortex circle

21b, 22b and end plate 21a, the 22a increases, also still can carry out lubricating between

vortex circle

21b, 22b and end plate 21a, the 22a effectively, thereby can prevent the wearing and tearing and the burn of

scroll

21,22 by means of the lubricant oil of being supplied.In addition, by the lubricant oil that grease channel 51 is supplied, its temperature is lower than the fluid after overcompression usually.Therefore, can cool off

vortex circle

21b, 22b by means of this oil of supply, thereby can reduce the thermal expansion of

vortex circle

21b, 22b.

Therefore, according to first model utility, even under near the too high operating condition of the temperature vortex center part, also still can remain in operation.Like this, just can carry out the running of finding time of short time.In addition, owing to avoided starting repeatedly and stopping the situation of compressor 10, so in the fault that just can prevent compressor 10 in advance.Further, owing to suppressed fluid temperature (F.T.) excessively to be risen, can prevent because burn etc. are former thereby make lubricant oil become bad owing to lubricant oil is under-supply.

In addition, in first model utility, use the valve part 55 that is out of shape along with the temperature of fluid to open or close grease channel 51.Therefore, when rising so high on the fluid temperature (F.T.) after the compression,, also can pass through grease channel 51 supplying lubricating oils reliably even do not carry out special control.

In addition, because when the running of finding time when the temperature of compressed fluid is too high waits, also supplying lubricating oil is adjusted the gap between

end plate

21a, 22a and vortex circle 21b, the 22b on a large scale so there is no need to consider the thermal expansion of

vortex circle

21b, 22b when this running.That is, when usual running, the gap between

end plate

21a, 22a and vortex circle 21b, the 22b is very narrow.Therefore, according to the utility model, can reduce the amount of leaking the gap of fluid between

end plate

21a, 22a and

vortex circle

21b, 22b, thereby can improve the efficient of compressor 10.

In second model utility, owing to valve part 55 usefulness bimetals are made, thereby can be with simple structure, cheap expense is made the valve part 55 of only just allowing the lubricant oil circulation when the temperature of fluid surpasses specified value.In addition, owing to used bimetal, valve part 55 is out of shape reliably under the temperature of regulation.

In the 3rd model utility, owing to, make it cover grease channel 51, so can prevent that lubricant oil circulates when turning round usually in grease channel 51 with simple reliable in structure ground by means of valve part 55 pressurization of 57 pairs of dull and stereotyped states of spring members.On the other hand, because when the temperature on the end, center of

vortex circle

21b, 22b rises to above specified value, valve part 55 just overcomes the resistance of spring members 57 and bending, circulates so can guarantee the lubricant oil in the grease channel 51 at this moment again.

In the 4th model utility, the lubricant oil in the casing 11 flows into the inside of the barrel 30 of compressing mechanism 15 behind the inside of flowing through live axle 17.On the other hand, an end of grease channel 51 is at the inside opening of barrel 30.Therefore, according to the utility model, the oil supply gallery 49 of lubricant oil in the casing 11 by live axle 17 inside guided in the scroll compressor 10 of this structure to compressing mechanism 15, can be directed to the lubricant oil that flows out oil supply gallery 49 in the grease channel 51 at an easy rate and go.

In addition, in the utility model, grease channel 51 is arranged to run through the end plate 22a that rotates scroll 22.Therefore, as long as on the end plate 22a of rotation scroll 22, through hole is set, just can form grease channel 51.As a result, needn't make special-purpose rotation scroll 22 again, just can make scroll compressor 10 of the present utility model with very low cost.

Description of drawings

Fig. 1 is the integrally-built sectional view of the utility model embodiment's scroll compressor;

Fig. 2 is the stereogram of the grease channel that forms in the scroll in rotation;

Fig. 3 is the sectional view that is arranged in valve part, spring members and sleeve in the grease channel;

Fig. 4 is the performance plot of the state after the distortion of expression valve part;

Fig. 5 is the performance plot of variation in pressure in the expression pressing chamber.

Embodiment

Below, describe embodiment of the present utility model in detail with reference to accompanying drawing.

The scroll compressor of present embodiment connects in the drawings not expression, carries out on the cryogen circuit of refrigerant gas circuit refrigeration work, and be the machinery that compression refrigerant gas is used.

As shown in Figure 1, this scroll compressor 10 has the casing 11 that is made of the vaulted type pressurized container that seals.In the inside of this casing 11, held the compressing mechanism 15 of compression refrigerant gas and driven the drive motor 16 of this compressing mechanism 15.This drive motor 16 is arranged in the below of compressing mechanism 15, and is connected with this compressing mechanism 15 by live axle 17.

Above-mentioned compressor structure 15 has fixed scroll 21 and rotation scroll 22.Two

scroll

21,22 have

end plate

21a, 22a respectively and are vertically set on

Vorticose vortex circle

21b, 22b on this end plate 21a, the 22a.Vortex circle 21b, the 22b of each

scroll

21,22 are designed to intermeshing state.

Side in the rotation scroll 22 of the excircle end of the end plate 21a of fixed scroll 21 promptly at its downside, has formed the tubular of protruding that the end is arranged.The excircle end of fixed scroll 21 is mounted and fixed on the internal surface of casing 11.The vortex circle 21b of fixed scroll 21 makes the following protrusion that faces down from end plate 21a.In addition, be provided with apex seal 21c on the top of vortex circle 21b.

Flat framework 24 has been installed in airtight mode in lower end in the excircle end of the end plate 21a of fixed scroll 21.This framework 24 is fixed on the casing 11, and connects with fixed scroll 21.Like this, just between fixed scroll 21 and framework 24, formed inner space 26.Middle body at framework 24 is provided with opening, and has formed towards downside on the edge of this opening, is the protuberance 28 of the tubular of protrusion.Above-mentioned live axle 17 passes this protuberance 28, and is bearing on the protuberance 28, can freely rotate.

Above-mentioned rotation scroll 22 is arranged in the inner space 26 of framework 24 tops.On the lower surface of the end plate 22a that rotates scroll 22, formed columnar bearing part 30.The inside that this bearing part 30 inserts the protuberance 28 of said frame 24.On the other hand, on the front end (upper end portion) of live axle 17, formed eccentric part 17a.This eccentric part 17a inserts in the bearing part 30, can freely rotate.In the inside of bearing part 30, between the end plate 22a of the top end of eccentric part 17a and rotation scroll 22, formed oil chamber 32.

Above-mentioned drive motor 16 has stator 33 that is fixed on the casing 11 and the inboard that is arranged on this stator 33, the rotor 34 that can freely rotate.Above-mentioned live axle 17 intercalations are on this rotor 34, and like this, live axle 17 just can rotation when energising.And when live axle 17 rotations, rotation scroll 22 is just rotated on framework 24 by the eccentric part 17a of live axle 17.In addition, rotation scroll 22 also is bearing on the framework 24 by the Euclidean annulus of not representing among the figure, makes it not carry out rotation.

It is protruding upward that rotation scroll 22 is arranged to vortex circle 22b.On the head portion of this vortex circle 22b, be equipped with apex seal 22c.And, at the top end that

vortex circle

21b, 22b are arranged of two

scroll

21,22, with the end face on end plate 22a, the 21a of another

scroll

22,21 respectively, in the middle of becoming across the slip surface of oil film.In addition, between vortex circle 21b, the 22b of two

scroll

21,22, be separated to form pressing chamber 37.When rotation scroll 22 revolved round the sun, above-mentioned pressing chamber 37 just simultaneously moved to middle body from the excircle part of above-mentioned inner space 26, and one side is dwindled.The excircle of this inner space 26 has partly constituted the low-pressure section of casing 11 inside.

Refrigerant in the cryogen circuit is imported above-mentioned inner space 26 excircle part sucking pipe 41 and the refrigerant in the casing 11 are derived the outlet pipe 42 of casing 11 outsides, be bonded on the said machine casing 11 with airtight state respectively.Middle body at the end plate 21a of fixed scroll 21 has formed the gas discharge hole 43 that the middle body of inner space 26 is communicated with the upper space of fixed scroll 21.Gas discharge hole 43 is to be used for being discharged to the hole of going in the casing 11 at pressing chamber 37 through the refrigerant gas of overcompression.That is, the structure of the scroll compressor in the present embodiment is that casing 11 inside become the high-pressure section that has been full of the refrigerant gas of discharging, the structure of promptly so-called high pressure vaulted type.

Forming the coolant channel 44 that the lower space below the refrigerant of the upper space importing framework 24 is gone on fixed scroll 21 and the framework 24.The inner of above-mentioned outlet pipe 42 is at this lower space split shed.

Oil groove 46 has been formed on the bottom in casing 11, is provided with the oil feed pump 47 that the lubricant oil in the oil groove 46 is aspirated up by means of the rotation of this live axle 17 in the underpart of above-mentioned live axle 17.Owing to become high-pressure section in the casing 11, so the lubricant oil in the oil groove 46 has just become the lubricant oil of high pressure.

Be provided with in live axle 17 the lubricant oil in the casing 11, promptly the lubricant oil in the oil groove 46 is supplied to the oil supply gallery 49 of compressing mechanism 15.The lower end of this oil supply gallery 49 is communicated with oil groove 46 by oil feed pump 47, and on the other hand, its upper end is in the top end upper shed of the eccentric part 17a of live axle 17.That is, the outflow end of oil supply gallery 49 is at above-mentioned oil chamber 32 split sheds.So, aspirate the inside that the lubricant oil that comes up just passes through live axle 17 by oil feed pump 47, flow to from bottom to top in the oil supply gallery 49.

In addition, in oil supply gallery 49, in eccentric part 17a, formed bifurcated oil supply gallery 49a to the radially bifurcated extension of live axle 17.The Flow area of the outflow end of this bifurcated oil supply gallery 49a is step-like expansion, and in the sliding contact surface upper shed of eccentric part 17a.Bifurcated oil supply gallery 49a is after a part of lubricant oil shunting in the oil supply gallery 49, directly is supplied to the passage of the sliding contact surface of eccentric part 17a.

Lubricant oil in the above-mentioned oil chamber 32 and the lubricant oil that flows on the above-mentioned sliding contact surface all flow out from bearing part 30 at last.Then, a part of lubricant oil attracted in the excircle part of the inner space 26 that becomes the low-pressure section in the casing 11.

As shown in Figure 2,, formed the grease channel 51 that connects at the middle body of the end plate 22a of above-mentioned rotation scroll 22 again.One end of this grease channel 51 is in the inside of bearing

part

30,32 openings towards the oil chamber, and on the other hand, its other end is opening near end, vortex circle 22b center.This grease channel 51 is arranged in the inboard of the inner end of vortex circle 22b, can be communicated with above-mentioned gas tap hole 43 by pressing chamber 37.

As amplifying among Fig. 3 shown in the back, grease channel 51 is made up of following two passes: flow into the flow channel 51a that holds in the lower end surface upper shed of 32 the end plate 22a towards the oil chamber; Be communicated with the outflow end of this flow channel 51a, and the diameter circulation passage 51b bigger than this flow channel 51a.The outflow end of this circulation passage 51b is in the bottom surface upper shed of the recess 52 under the upper surface depression of end plate 22a.

Circulation passage 51b is step-like expansion with respect to flow channel 51a, and therefore, the end wall of flow channel 51a has just constituted the diapire of circulation passage 51b.In circulation passage 51b, be provided with valve part 55, sleeve 56 and spring members 57.

Valve part 55 is made the diameter discoideus flat board bigger than the diameter of flow channel 51a.Like this, valve part 55 just can be blocked flow channel 51a.That is, valve part 55 is arranged to cover grease channel 51.Valve part 55 usefulness bimetals are made, and can and be out of shape along with the temperature rising.This bimetal is to make double-layer structure with the different different kinds of metals of linear expansion coeffcient.And, when valve part 55 is arranged in the grease channel 51, that big one deck of linear expansion coeffcient is arranged in the top.

Sleeve 56 embeds and is fixed in the upper end portion of circulation passage 51b.Spring members 57 usefulness helical springs are made, and compression is installed between valve part 55 and the sleeve 56.In addition, spring members 57 is pressed in valve part 55 on the diapire of circulation passage 51b.That is, the diapire of circulation passage 51b plays the valve seat of valve part 55.

Valve part 55 is arranged near the grease channel 51 of the upper end opening end, center of vortex circle 22b, contacts with the refrigerant gas that passes through after pressing chamber 37 compresses.That is, valve part 55 is exposed under the refrigerant gas of overcompression, is subjected to the Temperature Influence of this refrigerant gas.And valve part 55 reaches specified value when above in the temperature of refrigerant gas, just overcomes the pressure of spring members 57, becomes crooked state.This specified value is set near the temperature height of the refrigerant gas the end, center of vortex circle 22b when turning round than usual.And during this time, as shown in Figure 4, valve part 55 will be the shape of projection to the distortion of the top of Fig. 4.Like this, just form the gap between the diapire of valve part 55 and circulation passage 51b, allowed the lubricant oil circulation.

In the scroll compressor 10 of present embodiment, vortex circle 21b, the 22b of two

scroll

21,22 are under the intermeshing state, and rotation scroll 22 is with respect to fixed scroll 21 rotations.Like this, the refrigerant gas in the cryogen circuit just internally the excircle in space 26 partly suck in the pressing chamber 37.Then, because pressing chamber 37 shrinks when middle body moves in the excircle part in space 26 internally, so the refrigerant gas in the pressing chamber 37 also is compressed and heats up thereupon.Therefore, the middle body of the end plate 22a of rotation scroll 22 just is exposed under the hyperthermia induced refrigerant gas.At this moment, for example, if the time marquis who is finding time to turn round, the pressure of the refrigerant of exhaust side is still such height, and the refrigerant pressure that sucks the suction side in the pressing chamber 37 descends gradually, unusual height when compression ratio will turn round than usual, and it is very high that delivery temperature just becomes.

On the other hand, be arranged on the valve part 55 in the grease channel 51, be exposed in the pressing chamber 37 under the refrigerant gas of overcompression.Therefore, as shown in Figure 3, when the temperature when delivery temperature and usual running was same, valve part 55 was in dull and stereotyped state, by spring members 57 it is pressed on the diapire of circulation passage 51b.Therefore, at this moment, not circulation in grease channel 51 of lubricant oil.And, because valve part 55 do not have complete sealing lubricating oil passage 51, also have a little lubricant oil can leak, but owing to grease channel 51 also is related with the oil chamber 32 of high pressure, so there is not the problem that reduces compression efficiency.

In addition, when delivery temperature excessively rises, when surpassing specified value, just as shown in Figure 4, valve part 55 overcomes the pressure of spring members 57, is bent state.Then, because the distortion of this valve part 55, grease channel 51 becomes the state of connection.

When finding time to turn round, in the refrigerant gas pressure decline of pressing chamber 37 suction side.On the other hand, in scroll compressor 10, the volume of pressing chamber 37 ratio when maximum and hour is fixed.Therefore, as shown in Figure 5, in the pressing chamber 37 of compressing mechanism 15,, do not reach the pressure in the casing 11 even the pressure of refrigerant gas rises gradually along with compression yet.And along with the rotation of rotation scroll 22, the high pressure refrigerant gas of casing 11 inside will flow back in the pressing chamber 37 that is communicated with gas discharge hole 43.At this moment, the gas pressure in the pressing chamber 37 becomes and temporarily is lower than the oil pressure of the oil chamber that is subjected to gas pressure 32 in the casing 11.As a result, the lubricant oil of oil chamber 32 just by grease channel 51, sprays near the end, center of

vortex circle

21b, 22b.

On the other hand, when the temperature of the refrigerant gas of exhaust side was lower than set point of temperature, valve part 55 just became dull and stereotyped state once more, and by spring members 57 it is pressed on the grease channel 51.Like this, just cut off the circulation of lubricant oil in the grease channel 51.

In the present embodiment, be the lubricant oil in the oil supply gallery 49 to be forced to be fed near the end, center of

vortex circle

21b, 22b by grease channel 51.Therefore, even making the surface pressure of

vortex circle

21b, 22b and

end plate

21a, 22a be in very high state owing to thermal expansion, also can be lubricated

vortex circle

21b, 22b and

end plate

21a, 22a reliably, can prevent the wearing and tearing and the burn of

scroll

21,22 by the lubricant oil of being supplied.In addition, the temperature of the lubricant oil by grease channel 51 supply, the temperature of the refrigerant gas after compressing than usual is low.Therefore, can also cool off

vortex circle

21b, 22b, reduce the thermal expansion of

vortex circle

21b, 22b by supplying this lubricant oil.

As a result, even under near the too high operating condition of the temperature vortex center part, also still can remain in operation.The time of finding time to turn round is shortened.In addition, can also avoid stopping repeatedly and restarting the situation of compressor 10, can prevent that compressor 10 from breaking down in advance.Also have,, can prevent because burn etc. are former thereby make the lubricant oil change bad because supplying lubricating oil has suppressed the excessive rising of refrigerant gas temperature.

In addition, in the present embodiment, utilize the valve part 55 that is out of shape along with the temperature of refrigerant gas to come switch oil passage 51.Therefore, when the excessive temperature through the refrigerant of overcompression rises, even do not control especially, also can be by grease channel 51 supplying lubricating oil reliably.

In addition, because the temperature through the refrigerant gas of overcompression is too high, and become when finding time to turn round and so on, supplying lubricating oil still, so when this running, just needn't consider the thermal expansion of

vortex circle

21b, 22b, not need the gap between

end plate

21a, 22a and vortex circle 21b, the 22b is transferred big.That is

end plate

21a, 22a in the time of, can allowing usual running the and the gap turn narrow between vortex circle 21b, the 22b.Therefore,, the leakage rate of the refrigerant that leaks the gap between

end plate

21a, 22a and

vortex circle

21b, 22b can be reduced, the efficient of compressor 10 can be improved according to present embodiment.

In addition, in the present embodiment,, thereby can realize only when the temperature of refrigerant gas surpasses specified value, just allowing the valve part 55 of lubricant oil circulation with simple structure and very low cost owing to valve part 55 usefulness bimetals are made.In addition, owing to used bimetal, can under the temperature of regulation, make valve part 55 distortion reliably.

In addition, the valve part 55 owing to push down dull and stereotyped state by means of spring members 57 adopts simple structure, the circulation of lubricant oil in grease channel 51 in the time of just preventing from reliably to turn round usually.In addition, owing to rise to specified value when above when the temperature on the end, center of

vortex circle

21b, 22b, valve part 55 will overcome the elastic force of spring members 57 and bending can be guaranteed the circulation of lubricant oil in the grease channel 51.

In addition, in the present embodiment, the lubricant oil of casing 11 inside is that oil supply gallery 49 backs of flowing through in the live axle 17 flow into oil chamber 32.On the other hand, in compressing mechanism 15, grease channel 51 is when running through the end plate 22a that rotates scroll 22, and its end is at the oil chamber of bearing part 30 inside 32 split sheds.Therefore, in the scroll compressor 10 of the lubricant oil in the casing 11, can pass through oil chamber 32 at an easy rate, the guiding of the lubricant oil in the oil supply gallery 49 grease channel 51 by oil supply gallery 49 guiding compressing mechanisms 15 this structures.

In addition, in the present embodiment, as the high pressure vaulted type compressors 10 at casing 11 inner formation high-pressure sections, oil chamber 32 is communicated with this high-pressure section.On the other hand, when finding time to turn round, because the gas pressure that sucks reduction, thereupon, the gas that in pressing chamber 37, is compressed, pressure has also reduced.Therefore, the gas pressure in the vortex center part also temporarily is reduced to lower than the gas pressure in the casing 11.Like this, just can be supplied to the vortex filament core by grease channel 51 reliably the extreme pressure lubricant of oil chamber 32.

In addition, in the present embodiment, grease channel 51 runs through the end plate 22a that rotates scroll 22.Therefore, as long as on the end plate 22a of rotation scroll 22, through hole is set, just can form grease channel 51.As a result, just needn't make the rotation scroll 22 of new special use, can realize the scroll compressor 10 of present embodiment with lower cost.

-other embodiment-

In the above-described embodiments, also can turn the structure of valve part 55 and spring members 57 around.That is, also can be pressed in structure on the sleeve 56 to valve part 55 with spring members 57.

In addition, different with the structure of the foregoing description, valve part 55 also can be arranged on the recess 52 of end plate 22a, in order to stop up grease channel 51.In this case, for example, can be fixed on an end connection of valve part 55 on the end plate 22a of rotation scroll 22.And the valve part 55 that utilizes bimetal to make is lived grease channel 51 at dull and stereotyped state lower cover, on the other hand, when becoming bent state, can open the outflow end of grease channel 51.

In addition, in the above-described embodiments, valve part 55 is not limited only to use the bimetal manufacturing, for example, also can make with marmem.

In addition, in the above-described embodiments, grease channel 51 is arranged on the end plate 22a that rotates scroll 22, but grease channel 51 also can be arranged on the end plate 21a of fixed scroll 21.

Claims

1. scroll compressor, it has following parts: casing (11); Compressing mechanism (15), it is arranged in the said machine casing (11), has a pair of scroll (21,22) of the Vorticose vortex circle (21b, 22b) that is vertically set on the end plate (21a, 22a); And be used for being supplied to the oil supply gallery (49) of above-mentioned compressor structure (15) with being stored in lubricant oil in the said machine casing (11); It is characterized in that,

Have at least an end plate (21a, 22a) on the scroll to have following part in the above-mentioned scroll (21,22):

Grease channel (51), it is made and can be communicated with above-mentioned oil supply gallery (49), and mouth is opened near the end, center of above-mentioned vortex circle (21b, 22b);

Valve part (55), it is out of shape along with the temperature of the fluid that is compressed by above-mentioned compressor structure (15), only during more than or equal to specified value, allows that lubricant oil circulates in the temperature of this fluid in above-mentioned grease channel (51).

2. scroll compressor as claimed in claim 1 is characterized in that,

Valve part (55) is made with bimetal, and is arranged to contact with the fluid that is compressed with compressing mechanism (15).

3. scroll compressor as claimed in claim 1 is characterized in that,

On the end plate with valve part (55) (21a, 22a), be provided with to pushing down the spring members (57) of this valve part (55) usefulness;

When above-mentioned valve part (55) under dull and stereotyped state, push down by above-mentioned spring members (57), when covering above-mentioned grease channel (51), stop lubricant oil in this grease channel (51), to circulate;

On the other hand, when above-mentioned valve part (55) overcomes the pressure of above-mentioned spring members (57), when being in bent state, allow the lubricant oil circulation in the above-mentioned grease channel (51).

4. scroll compressor as claimed in claim 1 is characterized in that,

On the rotation scroll (22) in a pair of scroll (21,22),, form to protrude the barrel (30) of eccentric part (17a) usefulness that forms for the end that is inserted in live axle (17) in a side opposite of end plate (22a) with vortex circle (22b) is arranged;

Grease channel (51) is made the end plate (22a) that runs through above-mentioned rotation scroll (22), and mouth is opened towards the inside of barrel (30);

Oil supply gallery (49) is gone up at above-mentioned live axle (17) and is formed, and mouth is opened towards the end face of eccentric part (17a).