CN103620224B

CN103620224B - Rotary compressor

Info

Publication number: CN103620224B
Application number: CN201280028329.8A
Authority: CN
Inventors: 鶸田晃; 尾形雄司
Original assignee: Matsushita Electric Industrial Co Ltd
Current assignee: Panasonic Holdings Corp
Priority date: 2011-06-07
Filing date: 2012-06-06
Publication date: 2016-01-20
Anticipated expiration: 2032-06-06
Also published as: JP6057181B2; WO2012169181A1; JPWO2012169181A1; US20140099218A1; CN103620224A

Abstract

Rotary compressor of the present invention (100) comprises compressing mechanism (3), motor (2), suck path (14), contact path (16) and the open and close valve (32) as control mechanism (30), and be provided with the inner space (28) of separating with the inside of seal container (1) and working room (25), refrigeration agent is stoped to flow to first safety check (35a) of working room (25) from inner space (28), with the second safety check (35b) stoping refrigeration agent to flow to inner space (28) from the inside of seal container (1), when open and close valve (32) is opened, along with the minimizing of the volume of working room (25), first safety check (35a) is opened, the pressure of working room (25) does not rise, now, rotary compressor (100) substantially zero sucks under volume and operates, when open and close valve (32) is closed, rotary compressor (100) operates under common suction volume.

Description

Rotary compressor

Technical field

The present invention relates to rotary compressor.

Background technique

The motor of compressor is controlled by inverter and microcomputer usually.If reduce the rotating speed of motor, then can make and use the freezing cycle device (refrigerating circulatory device) of compressor to operate with the ability fully lower than rated capacity.Patent documentation 1 and patent documentation 2 provide a kind of for utilizing the technology making freezing cycle device operate with capabilities with inverter control diverse ways.

Fig. 8 is partial cross section's structural drawing of the compressor shown in patent documentation 1.Compressor 601 has dividing blade (vane) 615, dividing blade spring 616, exhaust port 617, discharge tube 618, opening portion 619.Dividing blade 615 is divided into low pressure chamber and hyperbaric chamber by cylinder body 608.Opening portion 619, at the intermediate portion opening of cylinder body 608, is communicated with the switching mechanism 620 being arranged at opening portion 619.Switching mechanism 620 comprises plunger (plunger) 621 and plunger spring 622.At pressurized gas not from the state that high pressure ingress pipe 623 imports plunger 621, opening portion 619 and suction port 612 are linked by bypass 624.

Compressor 601 is connected with four-way valve 625 via discharge tube 618, and then is connected with utilizing side heat exchanger 626, decompressor 627, heat source side heat exchanger 628, accumulator (accumulator) 611, suction pipe 629.In addition, the centre of discharge tube 618 and four-way valve 625 and high pressure ingress pipe 623 are connected via solenoid valve 630.Piston 607 rotates in the direction of arrow A.

When solenoid valve 630 is open, high pressure ingress pipe 623 is imported into pressurized gas, and therefore plunger 621 overcomes plunger spring 622, the opening portion 610 of closed cylinder 608.The most refrigeration agent be now inhaled in cylinder body 608 from suction port 617 is discharged to discharge tube 618 by exhaust port 617.

On the other hand, when solenoid valve 630 cuts out, the differential pressure in compressor 601 reduces, and plunger 621 turns back to the position shown in Fig. 6 by means of the restoring force of plunger spring 622.Then, when again making compressor 1 operate, pressurized gas can not be imported into high pressure ingress pipe 623.The opening portion 619 being arranged at the intermediate portion of cylinder body 608 is communicated with suction port 612 via bypass 624.Consequently, a part for the refrigeration agent in cylinder body 608 returns suction port 612 via bypass 624 in compression way, and the refrigeration agent of discharging from discharge tube 618 significantly reduces.The running under more capabilities can be realized thus.

Fig. 9 is the longitudinal section of the compressor recorded in patent documentation 2.First row outlet 714 is formed at cylinder body 710, export 714 at main bearing 720 and this first row to be formed with second row communicatively and to export 723, pressurized gas is made to be discharged to outer cover 701, main bearing 720 is formed and exports the by-pass hole 722 between 723 with bypass valve (bypassvalve) 780 in first row outlet 714 and second row, makes the refrigeration agent after compressing return suction port 712.

When by-pass hole 722 is closed, the most refrigeration agent be inhaled in cylinder body 710 from suction port 712 is discharged to outer cover 701 by first row outlet 714 and second row outlet 723.

On the other hand, when making by-pass hole 722 open when high pressure is imported bypass valve 780, the refrigeration agent be inhaled in cylinder body 710 from suction port 712 exports 714 and by-pass hole 722 by first row, and turn back to suction port 712, therefore refrigeration agent can not be discharged to outer cover 701.Thereby, it is possible to the running under realizing more capabilities.

Prior art document

Patent documentation

Patent documentation 1: Japanese Laid-Open Patent Publication 61-93285 publication

Patent documentation 2: Japanese Unexamined Patent Application Publication 2008-509325 publication

Summary of the invention

Invent technical problem to be solved

But, be improve the efficiency of compressor for improving a method of the efficiency of freezing cycle device.The efficiency of compressor depends on the efficiency of used motor to a great extent.The highest efficiency is played under the rotating speed of major part motor near rated speed (such as 60Hz).Therefore, to use inverter etc. under the slow-speed of revolution (such as 30Hz), drive motor to be the raising cannot expecting compressor efficiency.In addition, when making freezing cycle device operate with the ability (less than 30% of such as rated capacity) lower than rated capacity, rotating speed along with rotary compressor reduces, moment of torsion changes the vibration brought to be strengthened, and then cannot (such as below 20Hz) rotary compressor be operated at the low rotational speed.As a result, the intermittent working that rotary compressor repeatedly operates and stops, the efficiency of freezing cycle device is caused to decline to a great extent.

In patent documentation 1, when open solenoid valve 630, be imported with pressurized gas in high pressure ingress pipe 623, therefore plunger 621 overcomes plunger spring 622, the opening portion 619 of closed cylinder 608.But the volume of opening portion 619 becomes dead volume (deadvolume, dead volume), thus makes the decrease in efficiency of compressor 601.

In patent documentation 2, first row outlet 714 is formed at cylinder body 710, therefore when wanting to reduce the dead volume of exhaust port, the intensity of cylinder body 710 declines, and the wearing and tearing each other of pressure during running or the parts caused by the distortion caused by temperature or abnormal wear become problem.In addition, if improve the intensity of cylinder body 710, then the dead volume of exhaust port will increase, the decrease in efficiency of compressor.In addition, refrigeration agent is prevented to be back to the first expulsion valve of pressing chamber from first row outlet 714 in order to form, need the height guaranteeing cylinder body 710 to a certain extent, particularly adopt high-density refrigerant at the refrigeration agent as working fluid, such as, when R410A or carbon dioxide, the increase of the leakage loss in the increase of the mechanical loss caused by the load of axle or blade increases or compression way, makes the decrease in efficiency of compressor.

In view of situation as above, the object of the present invention is to provide a kind of ability in freeze cycle all can play high efficiency rotary compressor to all capacity locations of capabilities.

For the technological scheme of dealing with problems

That is, the invention provides a kind of rotary compressor, its motor makes pistons work via axle, and wherein, compressing mechanism comprises: cylinder body; Be configured in the above-mentioned piston of the inside of above-mentioned cylinder body; Casing, to make the rotatable mode of above-mentioned axle keep above-mentioned axle, covers the both sides up and down of above-mentioned cylinder body, between the inner peripheral surface of above-mentioned cylinder body, forms working room; With the blade above-mentioned working room being divided into suction chamber and compression discharge chamber, the feature of this rotary compressor is, comprising: the seal container of storage compression mechanism and above-mentioned motor; The working fluid that should compress imports the suction path in above-mentioned suction chamber; Be arranged at said machine casing and the exhaust port that flows out from above-mentioned working room of working fluid after making compression; The inner space of separating mutually with inside and the above-mentioned working room of above-mentioned seal container; Contact path between above-mentioned inner space and above-mentioned suction path; The first path between above-mentioned exhaust port and above-mentioned inner space; The working fluid of no thoroughfare above-mentioned first path returns the first safety check of above-mentioned exhaust port from above-mentioned inner space; Alternate path between the inside of above-mentioned inner space and above-mentioned seal container; The working fluid of no thoroughfare above-mentioned alternate path returns the second safety check of above-mentioned inner space from the inside of above-mentioned seal container; Be arranged at above-mentioned contact path and control the control mechanism of the pressure of above-mentioned inner space.

Invention effect

According to the present invention, use contact path that working fluid is returned from working room and suck path, rotary compressor can be made thus to operate under relatively little suction volume.On the other hand, if forbid that working fluid returns from working room to suck path, then can make rotary compressor under relatively large suction volume, namely operate under common suction volume.In addition, when control mechanism and inverter are through controlling, when utilizing the increase of the rotating speed of motor to compensate the minimizing sucking volume, reduce and sucking volume, instead of driving motor at the low rotational speed.Therefore, it is possible to provide a kind of ability in freeze cycle all can play high efficiency rotary compressor to all capacity locations of capabilities.

In addition, according to the present invention, there is not the opening portion to cylinder body, therefore, it is possible to prevent the decrease in efficiency of the compressor caused by dead volume.In addition, the intensity of cylinder body can be guaranteed and prevent the wearing and tearing each other of pressure when operating or parts caused by distortion caused by temperature or abnormal wear.In addition, the height of cylinder body can be reduced, therefore particularly high-density refrigerant is adopted at the refrigeration agent as working fluid, such as when R410A carbon dioxide, R32, R407C, HFO-1234yf or R134a, the increase of the mechanical loss caused by load increase of axle or blade can be prevented or compress the increase of the leakage loss in way, high efficiency rotary compressor can be played therefore, it is possible to provide.

Accompanying drawing explanation

Fig. 1 is the longitudinal section of the rotary compressor of the first mode of execution.

Fig. 2 is the longitudinal section of the rotary compressor of the second mode of execution.

Fig. 3 A is the control flow chart of control device (open and close valve) and inverter.

Fig. 3 B is other control flow chart of control device (open and close valve) and inverter.

Fig. 4 is the plotted curve of the relation representing the suction volume of the ability of rotary compressor, compressing mechanism, the state of open and close valve and the rotating speed of motor.

Fig. 5 is the plotted curve of the relation representing the ability of rotary compressor and the efficiency of rotary compressor.

Fig. 6 is the longitudinal section of the rotary compressor of the 3rd mode of execution.

Fig. 7 is the structural drawing of the freezing cycle device of the rotary compressor utilizing present embodiment.

Fig. 8 is partial cross section's structural drawing of the rotary compressor used in the control gear of the compressor of prior art.

Fig. 9 is the longitudinal section of the rotary compressor used in the capacity variable type rotary compressor of prior art and its method of operation.

Reference character

1 seal container

2 motors

3 compressing mechanisms

4 axles

5 cylinder bodies

6 upper casings

7 lower housings

8 pistons

9 blades

12 reservoirs (accumulator, accumulator)

14 suck path

16 contact paths

22 store oil portions

25 working rooms

28 inner spaces

29 exhaust ports

30 control mechanisms

32 open and close valves

34a first path

34b alternate path

35a first safety check

35b second safety check

40 compressor main bodies

42 inverters

44 control devices

90 three-way valve

92 high-voltage path

100,200,300 rotary compressors

Embodiment

(the first mode of execution)

As shown in Figure 1, the rotary compressor 100 of present embodiment comprises compressor main body 40, reservoir (accumulator, accumulator) 12, discharge path 11, sucks path 14, gets in touch with path 16, control mechanism 30, inverter 42 and control device 44.

Compressor main body 40 comprises seal container 1, motor (motor) 2, compressing mechanism 3 and axle 4.Compressing mechanism 3 is configured in the below in seal container 1.Motor 2 is configured in above compressing mechanism 3 in seal container 1.Compressing mechanism 3 and motor 2 are linked by axle 4.The terminal 21 for supplying electric power to motor 2 is provided with on the top of seal container 1.In the bottom of seal container 1, be formed with the store oil portion 22 for keeping lubricant oil.Compressor main body 40 has the structure of so-called hermetic type compressor.

Discharge path 11, suction path 14 and contact path 16 are made up of refrigerant pipe respectively.

The top of the through seal container 1 of discharge path 11, and at the inside opening of seal container 1.Working fluid (being such as typically refrigeration agent) after compression is derived the outside of compressor main body 40 by discharge path 11.Suck path 14 and there is the one end be connected with compressing mechanism 3 and the other end be connected with reservoir 12, the trunk of its through seal container 1.

Suck the refrigeration agent (having refrigeration agent to be compressed) that should compress in path 14 guides to compressing mechanism 3 working room 25 from reservoir 12.Contact path 16 has the one end be connected with compressing mechanism 3 in the position different from sucking path 14 and the other end be connected with reservoir 12, the trunk of its through seal container 1.

Contact path 16 makes the refrigeration agent of the working room 25 being temporarily inhaled into compressing mechanism 3 return before compression and sucks path 14.

Compressing mechanism 3 is hydraulic mechanism of positive displacement, is driven by motor 2, with this compressed refrigerant.As shown in Figure 1, compressing mechanism 3 comprises cylinder body 5, piston 8, blade (vane) 9, spring 10, upper casing (frame (frame)) 6 and lower housing 7.The piston 8 chimeric with the eccentric part 4a of axle 4 is had in the internal configurations of cylinder body 5.Working room 25 is formed between the outer circumferential face and the inner peripheral surface of cylinder body 5 of piston 8.At cylinder body 5, be formed with blade groove (not shown).At blade groove, be accommodated with the blade 9 with the front end contacted with the outer circumferential face of piston 8.Spring 10 is configured in blade groove.And blade 9 is pressed to piston 8.

The mode that upper casing 6 and lower housing 7 are covered to clip cylinder body 5 is separately positioned on the upper side and lower side of cylinder body 5.Working room 25 between cylinder body 5 and piston 8 separate by blade 9, be formed with working room 25(suction chamber thus) and working room 25(compress discharge chamber).The refrigeration agent that should compress is imported into working room 25(suction chamber by sucking path 14).Refrigeration agent after compression compresses discharge chamber from working room 25() flow out in the exhaust port 29 being formed in upper casing 6.In addition, upper casing 6 with working room 25 opposition side, be provided with the inner space 28 of separating with the inside of seal container 1 and working room 25 phase, between exhaust port 29 and inner space 28, be formed with the first path 34a, inner space 28 is communicated with exhaust port 29.In addition, at the first path 34a, be provided with the first safety check 35a, stop refrigeration agent to flow to working room 25 from inner space 28.In addition, be formed with alternate path 34b between inner space 28 and the inside of seal container 1, inner space 28 is communicated with the inside of seal container 1.In addition, alternate path 34b is provided with the second safety check 35b, stops refrigeration agent to flow to inner space 28 from the inside of seal container 1.

Wherein, blade 9 also can be integrated with piston 8.That is, namely can form piston 8 and blade 9 by pendulum-type piston (SWINGPISTONTYPE), also blade 9 and piston 8 can be engaged.

Motor 2 comprises stator 17 and rotor 18.Stator 17 is fixed on the inner peripheral surface of seal container 1.Rotor 18 is fixed on axle 4 and rotates together with axle 4.Drive through motor 2, piston 8 moves in the inside of cylinder body 5.As motor 2, can IPMSM(InteriorPermanentMagnetSynchronousMotor be used: internal permanent magnet synchronous motor) and SPMSM(SurfacePermanentMagnetSynchronousMotor: surperficial permagnetic synchronous motor) etc. can change the motor of rotating speed.

Control device 44 control inverter 42 regulates the rotating speed of motor 2, i.e. the rotating speed of rotary compressor 100.As control device 44, the DSP(DigitalSignalProcessor comprising A/D change-over circuit, imput output circuit, arithmetic circuit, storage device etc. can be used: DSP digital signal processor).

Reservoir 12 comprises and stores container 12a and ingress pipe 12b.Store container 12a and there is the inner space that can keep liquid refrigerant and gas refrigerant.The through top storing container 12a of ingress pipe 12b, and towards storing the inner space opening of container 12a.The other end sucking path 14 is connected with reservoir 12 respectively with the other end of contact path 16.Suck the other end in path 14 and the through bottom storing container 12a of the other end of contact path 16, extend to top from the bottom storing container 12a, storing the inner space opening of container 12a with level altitude.That is, contact path 16 is connected with suction path 14 via the inner space of reservoir 12.In addition, directly flow to from ingress pipe 12b to reliably prevent liquid refrigerant and suck path 14, also the miscellaneous parts such as buffer can be set in the inside storing container 12a.In addition, also contact path 16 directly can be connected with suction path 14 or ingress pipe 12b.

Control mechanism 30 compressor main body 40 outer installment in contact path 16.In present embodiment, control mechanism 30 comprises open and close valve 32.In addition, the one end be connected with compressing mechanism 3 getting in touch with path 16 is communicated with inner space 28.Control mechanism 30 changes the suction volume of rotary compressor 100.

When open and close valve 32 is opened, along with the minimizing of the volume of working room 25, the first safety check 35a opens, and refrigeration agent is discharged to the outside of working room 25.The refrigeration agent discharged is returned by contact path 16 and sucks path 14.Therefore, the pressure of working room 25 does not rise.Now, refrigeration agent can not be discharged to the inside of seal container 1 from inner space 28, and therefore rotary compressor 100 substantially zero sucks under volume and operates.

When open and close valve 32 is closed, refrigeration agent cannot be returned from working room 25 by contact path 16 and suck path 14.Therefore, induction stroke gets started compression stroke after terminating.Now, prevent refrigeration agent from refluxing from inner space 28 to working room 25 by the first safety check 35a, therefore the pressure increase of inner space 28.And then when the pressure increase of inner space 28 is to the pressure that the pressure of the inside than seal container 1 is high, the second safety check 35b opens, and refrigeration agent is discharged to the inside of seal container 1.Now, rotary compressor 100 operates under common suction volume.

Rotary compressor 100 control inverter 42 of present embodiment regulates the rotating speed of motor 2, i.e. the rotating speed of rotary compressor 100.But, when making freezing cycle device with the ability lower than rated capacity (such as, less than 30% of rated capacity) running time, along with the reduction of the rotating speed of rotary compressor 100, vibration caused by moment of torsion variation increases, and then cannot under low rotating speed (such as below 20Hz), rotary compressor 100 be operated.As a result, the intermittent working that rotary compressor 100 repeatedly operates and stops, thus the efficiency of freezing cycle device is declined to a great extent.

Herein, extensive known a kind of so-called " utilizing the ability variable technique sucking volume and switch " (hereinafter referred to as suction volume handoff technique), that is, a part for the refrigeration agent after being compressed by cylinder body 5 be bypassed to the outside of cylinder body 5 and make the technology of the suction volume-variation of working room 25.The rotary compressor 100 of present embodiment can realize so-called digital type compressor technology as this suction volume handoff technique, in the art by by open open and close valve 32 and substantially zero suck the situation of to carry out under volume operating and the situation of carrying out operating by closing open and close valve 32 under common suction volume combined come control ability.

In the rotary compressor 100 of present embodiment, open and close open and close valve 32.Such as, open and close valve 32 opened for 5 seconds and closed for 5 seconds, the ability that the running in totally 10 seconds brings can be set to 50% thus.As a result, when making freezing cycle device operate with the ability lower than rated capacity, rotary compressor 100 also can be made to operate continuously, therefore, it is possible to make freezing cycle device operate with high efficiency.

In addition, in the rotary compressor 100 of present embodiment, when operating under common suction volume by closing open and close valve 32, do not exist towards the opening portion of cylinder body 5, therefore, it is possible to prevent the decrease in efficiency of the compressor caused by dead volume.That is, in common rotary compressor 100, the working room 25 between cylinder body 5 and piston 8 is separated by blade 9, thus, is formed with working room 25(suction chamber) and working room 25(compression discharge chamber).The refrigeration agent that should compress is imported into working room 25(suction chamber by sucking path 14).Herein, when there is opening portion in cylinder body 5, opening portion compresses discharge chamber with working room 25() be communicated with, refrigeration agent in working room 25 will be maintained in opening portion, if and opening portion and working room 25(suction chamber) be communicated with, then because the pressure of the refrigeration agent in opening portion is higher than working room 25(suction chamber) the pressure of refrigeration agent, the refrigeration agent in opening portion will reflux (adverse current) to working room 25(suction chamber).Now, working room 25(suction chamber) refrigeration agent reduce, volumetric efficiency reduces.In addition, the refrigeration agent in opening portion can not be discharged to the inside of seal container 1, therefore correspondingly loses compressed capability, increases the input of compressor.This series of loss is called the decrease in efficiency of the compressor caused by dead volume.

In addition, in the rotary compressor 100 of present embodiment, by closing open and close valve 32, when operating under common suction volume, be formed with at upper casing 6 exhaust port 29 that the working fluid after making compression flows out from working room 25.According to this structure, the intensity of cylinder body 5 can be guaranteed, therefore, it is possible to prevent the wearing and tearing each other of pressure when operating or parts caused by distortion caused by temperature or abnormal wear.In addition, the height of cylinder body 5 is not by the restriction that the structure of safety check is brought.Result is, when the refrigeration agent as working fluid uses high-density refrigerant, such as, when using R410A or carbon dioxide, can the height of cylinder body 5 be suppressed lower, therefore, it is possible to the increase reducing the mechanical loss caused by load increase of axle 4 or blade 9 and the gap formed in the inner circumferential of cylinder body 5 and the periphery of piston 8, therefore, it is possible to prevent the increase of the leakage loss compressed in way.High efficiency rotary compressor 100 can be played as a result, can provide.

In addition, in the rotary compressor 100 of present embodiment, by closing open and close valve 32, when operating under common suction volume, form the first safety check 35a and the second safety check 35b in end face direction.According to this structure, the inside of inner space 29 and seal container 1 can be flowed to swimmingly from the refrigeration agent of exhaust port 29 outflow, therefore, suppressed from the loss the operation of working room 25 discharging refrigerant, can provide and can play high efficiency rotary compressor 100.

In addition, in the rotary compressor 100 of present embodiment, by closing open and close valve 32, when operating under common suction volume, the sectional area of alternate path 34b is configured to the sectional area being greater than the first path 34a.According to this structure, the first path 34a, at cylinder body 5 opening, therefore when the sectional area of increase first path 34a, causes the decrease in efficiency of the compressor caused by dead volume.On the other hand, when the sectional area of reduction first path 34a, due to the resistance of refrigeration agent flowed out by exhaust port 29 from working room 25, the pressure increase in working room 25, to the pressure higher than head pressure, causes the increase of compression power.Therefore, the sectional area of the first path 34a needs to be defined as making the efficiency of rotary compressor 100 reach maximum.But alternate path 34b is arranged between the inside of inner space 29 and seal container 1, and therefore the decrease in efficiency of the compressor caused by dead volume can not occur.That is, by means of the resistance of the refrigeration agent that alternate path 34b flows out, suppress the pressure increase of inner space 29, improve the performance of rotary compressor 100 thus.As a result, by the sectional area of alternate path 34b being set larger than the sectional area of the first path 34a, and can provide and can play high efficiency rotary compressor 100.

In addition, the first safety check 35a and the second safety check 35b can be made up of leaf valve (reedvalve), and this leaf valve is by reed portion 36a, 36b and valve stop (valve guard portion (valvestopper)) 37a, 37b.Form safety check alternatively, have free valve (free-valve) (not shown), this free valve comprises valve body, guide portion and spring.Safety check alternatively, can also be made up of (not shown) plunger and plunger spring.When using plunger and plunger spring, can often time open (opening wide), therefore, it is possible to the pressure loss occurred in minimizing safety check.Herein, free valve have compared with leaf valve can reduce working fluid by time the feature of the pressure loss.But in the rotary compressor 100 of present embodiment, there are the following problems, that is, when being closed from the state opened by open and close valve 32, valve body and guide portion collide and noise occur, until the pressure of inner space 29 raises, till valve body closes path.Therefore, in the rotary compressor 100 of present embodiment, preferably leaf valve is used.

Then, to utilizing the ability variable technique of suction volume switching and driving the relation of the inverter 42 of motor 2 to be described with arbitrary rotating speed.

First, be described for the situation of the freezing cycle device that operates under the ability of 70%.

Use " utilizing the ability variable technique sucking volume and switch " (hereinafter referred to as suction volume handoff technique), that is, a part for the refrigeration agent after being compressed by cylinder body 5 be bypassed to the outside of cylinder body 5 and make the technology of the suction volume-variation of working room 25.Now, in the rotary compressor 100 of present embodiment, open and close open and close valve 32.Such as, open and close valve 32 was opened for 3 seconds and closed for 7 seconds, thereby, it is possible to the ability that the running in totally 10 seconds brings is set to 70%.

Like this, repeatedly carry out the on-off action of open and close valve 32, by the opening time in change on-off action and shut-in time, and the ability of freezing cycle device can be changed.That is, open and close valve 32 on-off action repeatedly in, by making the increasing proportion of opening time, the ability of freezing cycle device can be reduced.

As mentioned above, utilize based on suck ability variable technique that volume switches carry out control ability time, need to make rotary compressor 100 substantially zero suck the time of carrying out operating under volume and be set as 30% by by opening open and close valve 32.Now, because rotary compressor 100 remains in operation, even if the power of compressed refrigerant is zero, the mechanical loss driving compressing mechanism 3 and generation also can be occured as.

On the other hand, when driving motor 2 by inverter 42 with arbitrary rotating speed, be 70%(such as 42Hz by making the rotating speed of motor 2 relative to rated speed (such as 60Hz)) and operate, ability can be set to 70%.Major part motor 2 is all designed to play the highest efficiency under the rotating speed of the vicinity of rated speed (such as 60Hz), but as long as carry out situation about operating under the rotating speed (such as 42Hz) of about 70%, then can maintain high efficiency.Drive the inverter 42 of motor 2 that freezing cycle device can be made to operate under high efficiency as a result, use with arbitrary rotating speed.

Then, be described for the situation of the freezing cycle device that operates under the ability of 50%.

When utilizing so-called " utilizing the ability variable technique sucking volume and switch ", in the rotary compressor 100 of present embodiment, open and close open and close valve 32.Such as, open and close valve 32 was opened for 5 seconds and closed for 5 seconds, thereby, it is possible to the ability that the running in totally 10 seconds brings is set to 50%.

On the other hand, when driving motor 2 by inverter 42 with arbitrary rotating speed, be 50%(such as 30Hz by making the rotating speed of motor 2 relative to rated speed (such as 60Hz)) and operate, ability can be set to 50%.But most of motor 2 is all designed to play the highest efficiency under the rotating speed of the vicinity of rated speed (such as 60Hz), but when operating under the rotating speed (such as 30Hz) of about 50%, efficiency declines to a great extent.Utilize the ability variable technique sucking volume switching that freezing cycle device more can be made to operate under high efficiency as a result, use.

Therefore, suck the ability variable technique that volume switches and drive for the relation of the inverter 42 of motor 2 for utilizing with arbitrary rotating speed, by selecting a side that freezing cycle device can be made to operate with high efficiency, and freezing cycle device can be made to operate with high efficiency.

Wherein, in the present embodiment, the ability variable technique using the switching of suction volume and the inverter 42 driving motor 2 with arbitrary rotating speed has been distinguished.When the ability running making freezing cycle device with 70%, have selected the ability variable technique utilizing and suck volume and switch, when the ability running making freezing cycle device with 50%, have selected the inverter 42 driving motor 2 with arbitrary rotating speed, but present embodiment is not limited thereto.For utilizing which kind of mode above-mentioned to for the ability controlling freeze cycle, preferably select a side that freezing cycle device can be made to operate with high efficiency.

(the second mode of execution)

As shown in Figure 2, the rotary compressor 200 of present embodiment also comprises the second compressing mechanism 33 except the compressing mechanism 3 illustrated in the first mode of execution.Below, to parts mark " first " of the compressing mechanism 3 illustrated in the first mode of execution.Such as, cylinder body 5 is labeled as the first cylinder body 5, piston 8 is labeled as first piston 8, blade 9 is labeled as the first blade 9, working room 25 is labeled as the first working room 25, compressing mechanism 3 is labeled as the first compressing mechanism 3.

Second compressing mechanism 33 comprises the second cylinder body 55, second piston 58, second blade 59 and the second spring 60.Second cylinder body 55 is configured to same heart shaped relative to the first cylinder body 5.Second piston 58 chimeric with the second eccentric part 4b of axle 4 is had in the internal configurations of the second cylinder body 55.The second working room 75 is formed between the outer circumferential face and the inner peripheral surface of the second cylinder body 55 of the second piston 58.At the second cylinder body 55, be formed with the second blade groove (not shown).At the second blade groove, be accommodated with second blade groove 59 with the front end contacted with the second piston 58.Second spring 60 is configured in the second blade groove.And the second blade 59 is pressed to the second piston 58 by the second spring 60.The second working room 75 between second cylinder body 55 and the second piston 58 is separated by the second blade 59, thus, forms the second working room 75(second suction chamber) and the second working room 75(second compress discharge chamber).The refrigeration agent that should compress sucks path 15 by second and is imported into the second working room 75(second suction chamber).Second row outlet 79 is formed at upper casing 6.Thus, refrigeration agent upon compression compresses discharge chamber from the second working room 75(second) be imported into the inside of seal container 1 second row outlet 79, be provided with expulsion valve 35c.Thus, refrigeration agent is not from internal reflux to the second working room 75 of sealed volume 1.

In first compressing mechanism 3, the refrigeration agent that should compress sucks path 14 by first and is imported into the first working room 25(suction chamber).Refrigeration agent after compression compresses discharge chamber from the first working room 25() flow out in the first row outlet 29 being formed in lower housing 7.In addition, lower housing 7 with the first working room 25 opposition side, be provided with the inner space 28 of separating with the inside of seal container 1, the first working room 25 and the second working room 75, between first row outlet 29 and inner space 28, be formed with the first path 34a, inner space 28 and first row export 29 and are communicated with.In addition, at the first path 34a, be provided with the first safety check 35a, stop refrigeration agent to flow to the first working room 25 from inner space 28.In addition, be formed with alternate path 34b between inner space 28 and the inside of seal container 1, inner space 28 is communicated with the inside of seal container 1.In addition, alternate path 34b is provided with the second safety check 35b, stops refrigeration agent to flow to inner space 28 from the inside of seal container 1.

Herein, the first working room 25 is preferably made to be positioned at vertical (vertical) below relative to the second working room 75.This is because when capabilities operates, only have suction refrigeration agent to pass through in the first working room 25, therefore center housing temperature reduces.In addition, reason is also, for the viewpoint of thermal stratification, the cylinder body that temperature is lower is positioned at below more can be suppressed from discharging refrigerant to sucking being heated of refrigeration agent.

In addition, lower housing 7 had the silencing apparatus (enclosing, muffler) 23 in the space that can receive the refrigeration agent after being compressed by the first compressing mechanism 3 cover.The through lower housing of stream 26 7, first cylinder body 5, middle plate 53, second cylinder body 55 and upper casing 6.Thus, refrigeration agent moves to the inside of seal container 1 from the space of silencing apparatus 23.

The projected direction of the first eccentric part 4a and the projected direction of the second eccentric part 4b stagger 180 degree.That is the phase place of first piston 8 and the phase place of the second piston 58 stagger 180 degree by the angle of swing of axle 4.

Refrigeration agent sucks path 14 by first and is supplied to the first compressing mechanism 3.Refrigeration agent sucks path 15 by second and is supplied to the second compressing mechanism 33.Refrigeration agent is compressed by the first compressing mechanism 3 or the second compressing mechanism 33, is discharged to the inside of seal container 1.First sucks path 14 and the second suction path 15 is connected with reservoir 12 respectively.Wherein, in inside or the outside of reservoir 12, the side sucked in path 14 and 15 is also passable from the opposing party's bifurcated (branch).

As shown in Figure 2, the second compressing mechanism 33 is not connected with contact path 16, and therefore the suction volume of the second compressing mechanism 33 is constant all the time.Contact path 16 is only connected with the first compressing mechanism 3, only can change the suction volume of the first compressing mechanism 3.Thereby, it is possible to suppress the cost of production of rotary compressor 200.Certainly, also can be that contact path 16 is connected with the first compressing mechanism 3 and the second compressing mechanism 33, respectively can change each suction volume of the first compressing mechanism 3 and the second compressing mechanism 33.

In the present embodiment, the first compressing mechanism 3 is configured in the side away from motor 2, and the second compressing mechanism 33 is configured in the side near motor 2.That is, the axle direction along axle 4 is arranged in sequence with motor 2, second compressing mechanism 33 and the first compressing mechanism 3.Second compressing mechanism 33 has fixing suction volume, therefore with can substantially zero suck volume under compared with the first compressing mechanism 3 of operating, need to be set to large moment of torsion.Therefore, when the second compressing mechanism 33 is configured in the side near motor 2, make the first compressor 3 substantially zero suck volume under operate time put on the load reduction of axle 4, thereby, it is possible to reduce the mechanical loss of upper casing 6 and lower housing 7 etc.In addition, when can substantially zero suck the first compressing mechanism 3 operated under volume be configured in downside time, the refrigeration agent after due to compression can be reduced and flow to the inner space 28 of seal container 1 and the pressure loss that produces by silencing apparatus 23.But the position relationship of the first compressing mechanism 3 and the second compressing mechanism 33 is not limited to above-mentioned relation.

In addition, in the present embodiment, the common suction volume of the first compressing mechanism 3 is equal with the suction volume of the second compressing mechanism 33.Herein, substantially zero to suck the situation operated under volume be low volume mode to make the first compressor 3, and the situation making the first compressing mechanism 3 operate under common suction volume is high volume mode.Now, when the suction volume under the high volume mode of rotary compressor 200 is in season V, the suction volume under low volume mode is V/2.

Then, with reference to Fig. 3 A, illustrate and drive the inverter 42 of motor 2, the control mechanism 30(open and close valve 32 based on the control device 44 of control inverter 42 with arbitrary rotating speed) and the rate-determining steps of inverter 42.

In step 1, according to the rotating speed of required capacity adjustment motor 2.Specifically, by the rotational speed regulation of motor 2 be the refrigerant flow that can obtain needing.Then, in step 2 and step 6, the rotating speed judging to be reduction of motor 2 still improves the rotating speed of motor 2.When being judged as in step 2 having carried out falling slow-revving process, entering step 3, judging whether present rotating speed is below 30Hz.If present rotating speed is below 30Hz, then in step 4, judge whether open and close valve 32 is in closed condition.When open and close valve 32 is in closed condition, in steps of 5, perform the process of opening open and close valve 32 and the rotating speed of motor 2 is promoted to the process of rotating speed of twice of present rotating speed.The order of each process in step 5 is not particularly limited, but can with the rotating speed opening open and close valve 32 and promote motor 2 roughly simultaneously.

On the other hand, when being judged as the process carrying out promoting rotating speed in step 2, entering step 7, judging whether present rotating speed is more than 70Hz.If present rotating speed is more than 70Hz, then in step 8, judge whether open and close valve 32 is in open mode.When open and close valve 32 is in open mode, in step 9, the process of the process performing closedown open and close valve 32 and the rotating speed of the 1/2 times rotating speed of motor 2 being dropped to present rotating speed.The order of each process in step 9 is not particularly limited, but can reduce the rotating speed of motor 2 with closing open and close valve 32 roughly simultaneously.

Flow chart according to Fig. 3 A controls, and the relation of the state of open and close valve 32 and the rotating speed of motor 2 as shown in Figure 4, has retardation phenomenon thus.According to this control, the vibration (hunting) of compressing mechanism 3 can be prevented.

The rotary compressor 200 of present embodiment under the state of closing open and close valve 32, that is, has forbidden that refrigeration agent passes through to get in touch with path 16 and gets back to the suction volume of the compressing mechanism 3 the high volume mode in suction path 14 for " V " from working room 25.Under high volume mode between on-stream period, the rotating speed of motor 2 is reduced to the first rotating speed (such as from high rotary side, time 30Hz) below, control device 44 performs for reducing the process relevant with open and close valve 32 that suck volume and the process relevant with inverter 42 for the rotating speed that promotes motor 2.The process of opening open and close valve 32 is referred to for reducing the process relevant with open and close valve 32 sucking volume.The process relevant with inverter 42 for promoting the rotating speed of motor 2 refers to the twice rotating speed of target of motor 2 being set as nearest rotating speed.

In addition, control device 44 controls open and close valve 32 and inverter 42, compensates the increase sucking volume with the minimizing of the rotating speed of motor 2.Under the state opening open and close valve 32, refrigeration agent is namely allowed to be got back to the suction volume of the compressing mechanism 3 the low volume mode sucking path 14 by contact path 16 from working room 25 for " V/2 ".Under low volume mode between on-stream period, the rotating speed of motor 2 rises to the second rotating speed (such as, time 70Hz), control device 44 performs the process relevant with inverter 42 for increasing sucking the process relevant with open and close valve 32 of volume and the rotating speed for reducing motor 2.The process of closing open and close valve 32 is referred to for increasing the process relevant with open and close valve 32 sucking volume.The process relevant with inverter 42 for reducing the rotating speed of motor 2 refers to 1/2 times that the rotating speed of target of motor 2 is set as nearest rotating speed.

As shown in Figure 4, under the state of closing open and close valve 32, when the rotating speed of motor 2 drops to below 30Hz, open open and close valve 32, the rotating speed of motor 2 is promoted to 60Hz.Under the state opening open and close valve 32, when the rotating speed of motor 2 rises to more than 70Hz, close open and close valve 32, the rotating speed of motor 2 is reduced to 35Hz.This rotating speed opened in season when open and close valve 32 promotes the rotating speed of motor 2 is the 3rd rotating speed, when order this rotating speed of closing when open and close valve 32 reduces the rotating speed of motor 2 is the 4th rotating speed, the relation of (the first rotating speed) < (the 4th rotating speed), (the 3rd rotating speed) < (the second rotating speed) is set up.Such as, by being the rotating speed of below 30Hz by the first speed setting, rotary compressor 200 can be made to operate under the ability of wider scope.The lower limit of the first rotating speed is not particularly limited, such as, be 20Hz.

When control control mechanism 30, make the first compressing mechanism 3 zero suck when operating under volume in fact, inverter 42 is through controlling to compensate with the increase of the rotating speed of motor 2 minimizing sucking volume.Thus, when making freezing cycle device operate with the ability lower than rated capacity, the rotating speed of motor 2 also need not be made to drop to extremely low.That is, when operating with capabilities, also motor 2 can be driven can play under high efficiency rotating speed.Therefore, the efficiency of rotary compressor 200 also improves.

Specifically, the rotary compressor 200 of present embodiment, as represented with solid line in Fig. 5, when operating with capabilities, also can play high efficiency.In Fig. 5, the rated capacity of rotary compressor 200 is set to " 100% ".The efficiency of rotary compressor 200 when taking rated capacity as benchmark, along with the minimizing of ability needing to be played, namely the rotating speed of motor 2 reduction and reduce.As indicated in phantom, when driving motor 2 below the rotating speed of 50% of rated speed, the decline of efficiency is remarkable.In the present embodiment, when needing relatively low ability, operate under the low volume mode sucking volume V/2.Thereby, it is possible to drive motor 2 under as far as possible close to the rotating speed of rated speed.Therefore, required ability be rated capacity less than 50% region also can provide and can play high efficiency rotary compressor 200.

In addition, the ability increase of the rotary compressor 200 caused by the increase of the rotating speed of motor 2 is utilized to carry out 100%(absolutely) compensate the ability minimizing of the rotary compressor 200 caused by minimizing sucking volume not necessarily.Such as, open open and close valve 32 will suck volume reducing to 1/2 time, as long as the rotating speed of motor 2 is increased to twice, the ability of rotary compressor 200 would not change because pattern switches.But even if due to pattern switching, the ability of rotary compressor 200 has increase and decrease, also without much problems.

In addition, also can, according to the ratio of suction volume having (should change) to be changed, make the first cylinder body 5 different with the height of the second cylinder body 55, thus the common suction volume of the first compressing mechanism 3 and the suction volume of the second compressing mechanism 33 are changed.Specifically, the suction volume of the first compressing mechanism 3 is V1 in season, and when making the suction volume of the second compressing mechanism be V2, the suction volume VH under high volume mode is V1+V2, and the suction volume VL under low volume mode is V2.Suction volume VL under usual preferred low volume mode is in the scope of 0.2 to 0.8 relative to the ratio (VL/VH) of the suction volume VH under high volume mode.

Consider the ratio according to there being suction volume to be changed, make the first cylinder body 5 different with the height of the second cylinder body 55, thus make the situation that the common suction volume of the first compressing mechanism 3 and the suction volume of the second compressing mechanism 33 change, specifically, the suction volume considering the first compressing mechanism 3 is in season V1, when making the suction volume of the second compressing mechanism be V2, the suction volume VH under high volume mode is V1+V2, and the suction volume VL under low volume mode is the situation of V2.Now, when carrying out the switching of high volume mode and low volume mode, the rotating speed of motor 2 can regulate relative to the ratio (VL/VH) of the suction volume VH under high volume mode according to the suction volume VL under low volume mode.When switching to low volume mode from high volume mode, the rotating speed (rotating speed of target) of motor 2 is set to the rotating speed of rotating speed divided by ratio (VL/VH) of the motor before by switch mode 2.Equally, when switching to high volume mode from low volume mode, the rotating speed that the rotating speed of motor 2 is set to the motor before by switch mode 2 is multiplied by the rotating speed of ratio (VL/VH).Like this, the switching of the operation mode between high volume mode and low volume mode can just be carried out glibly.

In addition, in the present embodiment, control mechanism 30 does not have the ability that refrigeration agent is reduced pressure.The refrigeration agent be inhaled in the compression of compression discharge chamber, but can not be back to the first suction path 14 by contact path 16 in fact.Therefore, the decrease in efficiency caused by the pressure loss is minimum.But as long as do not bring the scope of very large impact to the efficiency of rotary compressor 200, control mechanism 30 also can have the ability making refrigeration agent reduce pressure.

Then, will be described other rate-determining steps of open and close valve 32 and inverter 42.

Even if the rotating speed of motor 2 is reduced to the first rotating speed (such as 30Hz) under high volume mode, the flow of refrigeration agent or superfluous time, control device 44 also can perform for reducing the process relevant with open and close valve 32 that suck volume and the process relevant with inverter 42 for the rotating speed that promotes motor 2.That is, control device 44 judges whether before actually the rotating speed of motor 2 being reduced to the first rotating speed to need to carry out pattern switching.Equally, under low volume mode, even if the rotating speed of motor 2 to be promoted to the second rotating speed (such as 70Hz), when the flow of refrigeration agent is also not enough, control device 44 also can perform for reducing the process relevant with open and close valve 32 that suck volume and the process relevant with inverter 42 for the rotating speed that promotes motor 2.That is, control device 44 judges whether before actually the rotating speed of motor 2 being promoted to the second rotating speed to need to carry out pattern switching.With reference to Fig. 3 B, this control example is described.

As shown in Figure 3 B, first, in step 11, the required rotating speed of calculation engine 2." required rotating speed " such as refers to the rotating speed for obtaining required refrigerant flow.Then, in step 12, the rotating speed needed for judgement be whether the first rotating speed (such as 30Hz) below.When required rotating speed is below the first rotating speed, in step 13, judge whether open and close valve 32 is in closed condition.When open and close valve 32 is in closed condition, in step 15, open open and close valve 32, and by the rotational speed regulation of motor 2 to the rotating speed that can obtain required refrigerant flow.When open and close valve 32 is in open mode, only regulate the rotating speed of motor 2 in step 14.

On the other hand, when required rotating speed is greater than the first rotating speed, judge whether required rotating speed is more than the second rotating speed (such as 70Hz) in step 16.When required rotating speed is more than second rotating speed, in step 17, judge whether open and close valve 32 is in open mode.When open and close valve 32 is in open mode, in step 18, close open and close valve 32, and by the rotational speed regulation of motor 2 to the rotating speed that can obtain required refrigerant flow.When open and close valve 32 is in closed condition, only regulate the rotating speed of motor 2 in step 19.

By carrying out the control illustrated with reference to Fig. 3 A and Fig. 3 B, rotary compressor 100 as represented with solid line in Fig. 5, even if when needs capabilities (load hour), also can high efficiency be played.In Fig. 5, the rated capacity of rotary compressor 100 is set to " 100% ".The efficiency of rotary compressor 100 when taking rated capacity as benchmark, along with the minimizing of ability needing to be played, namely the rotating speed of motor 2 decline and decline.As indicated in phantom, when driving motor 2 below the rotating speed of 50% of rated speed, the decline of efficiency is remarkable.In the present embodiment, when needing relatively low ability, operate under the low volume mode sucking volume V/2.Thereby, it is possible to drive motor 2 under as far as possible close to the rotating speed of rated speed.Therefore, required ability be rated capacity less than 50% region also can provide and can play high efficiency rotary compressor 100.

(the 3rd mode of execution)

As shown in Figure 6, the rotary compressor 300 of present embodiment has the control mechanism 30 of the structure different from the rotary compressor 100 of the first mode of execution.Other structure with illustrate in the first mode of execution the same.

Rotary compressor 300, has contact path 16, three-way valve 90, high-voltage path 92 as control mechanism 30.Contact path 16 comprises the upstream portion 16h be communicated with inner space 28 by three-way valve 90 and the downstream part be communicated with suction path 14 by three-way valve 90.High-voltage path 92 has the one end be connected with three-way valve 90 and the other end be connected with store oil portion 22.High-voltage path 92 be for by the pressure feed equal with the pressure of refrigeration agent after compression to the path of inner space 28.The rotary compressor 300 of present embodiment is so-called high pressure shell (shell) the type compressor that refrigeration agent after compressing is full of the inside of seal container 1.In store oil portion 22, maintain have with compression after the oil of the roughly equal pressure of the pressure of refrigeration agent.Three-way valve 90 makes suction path 14 be connected with the upstream portion 16h of contact path 16 with any person of high-voltage path 92.By controlling three-way valve 90, operate under arbitrary pattern of rotary compressor 300 in high volume mode and low volume mode can be made.

Under low volume mode, control three-way valve 90, make to suck path 14 and be communicated with the upstream portion 16h of contact path 16.Now, along with the volume reducing of working room 25, the first safety check 35a opens, and refrigeration agent is discharged to the outside of working room 25.The refrigeration agent discharged is returned by contact path 16 and sucks path 14.Therefore, the pressure of working room 25 does not rise.Now, refrigeration agent can not be discharged to the inside of seal container 1 from inner space 28, and therefore rotary compressor 300 substantially zero sucks under volume and operates.

Under high volume mode, control three-way valve 90, high-voltage path 92 is communicated with the upstream portion of contact path 16.Like this, refrigeration agent cannot be returned from working room 25 by contact path 16 and suck path 14, and therefore, the pressure of the oil in store oil portion 22 is imported into inner space 28.Therefore, refrigeration agent gets started compression stroke after induction stroke terminates.Now, the refrigeration agent after compression is discharged to inner space 28 by the first path 34a.And then when the pressure increase of inner space 28 is to the pressure that the pressure of the inside than seal container 1 is high, the second safety check 35b opens, and refrigeration agent is discharged to the inside of seal container 1.Now, rotary compressor 300 operates under common suction volume.

In the present embodiment, preferably (not shown) between three-way valve 90 and high-voltage path 92 is formed by the capillary tube etc. that sectional area compared with contact path 16 is relatively little.Refrigeration agent after compression is discharged to inner space 28 by the first path 34a, if but the passage resistance of the refrigeration agent of high-voltage path 92 is large, then and the second safety check 35b will open swimmingly, and the refrigeration agent of inner space 28 is discharged to the inside of seal container 1.

In the present embodiment, high-voltage path 92 has and is connected (opening) one end with store oil portion 22.In order to realize by high voltage supply to the object of inner space 28, one end of high-voltage path 92 also can be connected with certain part of the inside of seal container 1.In addition, when using rotary compressor 300 in freezing cycle device, high-voltage path 92 also can be connected with the high-pressure section of refrigerant circuit (such as, rotary compressor 300 and the part between radiator).But, according to the present embodiment, when closed interior space, the sealing effect brought by oil can be obtained.This, preventing from considering in the decrease in efficiency caused by leakage of refrigerant, gives preferably.

In addition, according to the present embodiment, use three-way valve 90 as control mechanism 30, but also can use four-way valve.Specifically, by three of four-way valve ends and high-voltage path 92, be communicated to the contact path 16 of inner space 28 upstream portion 16h, be communicated to the contact path 16 sucking path 14 and be connected, and a remaining end is closed all the time, so also can obtain the effect equal with present embodiment.

(application implementation mode)

As shown in Figure 7, rotary compressor 100 can be used to build freezing cycle device 500.Freezing cycle device 500 comprises rotary compressor 100, radiator 502, expansion mechanism 504 and vaporizer 506.These equipment connect by the above-mentioned refrigerant pipe that sequentially passes through and form refrigerant circuit.Radiator 502 such as comprises air-refrigerant heat exchanger, for cooling the refrigeration agent after being compressed by rotary compressor 100.Expansion mechanism 504 such as comprises expansion valve, is expanded by the cooled refrigeration agent of radiator 502 for making.Vaporizer 506 such as comprises air-refrigerant heat exchanger, for heating the refrigeration agent after being expanded by expansion mechanism 504.Also can use second and the 3rd the rotary compressor 200,300 of mode of execution carry out the rotary compressor 100 of alternative first mode of execution.

The several mode of executions illustrated in this specification can combine mutually without departing from the scope of spirit of the present invention.Such as, the three-way valve 90 illustrated in the open and close valve 30 illustrated in the second mode of execution and the 3rd mode of execution is combined, also can obtain the effect illustrated in the second mode of execution.

Utilizability in industry

The present invention is applicable to being applied to the compressor of the freezing cycle device that can be used in water heater, hot-water central heating device and air bells conditioner etc.The present invention is particularly suitable for the compressor of the air bells conditioner requiring wide range capability.

Claims

1. a rotary compressor, its motor makes pistons work via axle, wherein,

Compressing mechanism comprises:

Cylinder body;

Be configured in the described piston of the inside of described cylinder body;

Casing, to make the rotatable mode of described axle keep described axle, covers the both sides up and down of described cylinder body, between the inner peripheral surface of described cylinder body, forms working room; With

Described working room is divided into the blade of suction chamber and compression discharge chamber,

The feature of this rotary compressor is, comprising:

Receive the seal container of described compressing mechanism and described motor;

The working fluid that should compress imports the suction path in described suction chamber;

Be arranged at described casing and the exhaust port that flows out from described working room of working fluid after making compression;

The inner space of separating mutually with inside and the described working room of described seal container;

Contact path between described inner space and described suction path;

The first path between described exhaust port and described inner space;

The working fluid of no thoroughfare described first path returns the first safety check of described exhaust port from described inner space;

Alternate path between the inside of described inner space and described seal container;

The working fluid of no thoroughfare described alternate path returns the second safety check of described inner space from the inside of described seal container; With

Be arranged at described contact path and control the control mechanism of the pressure of described inner space.

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

Use open and close valve as described control mechanism.

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

As described control mechanism, comprise the high-voltage path of the three-way valve pressure equal with the pressure of the working fluid after compression with supply, described suction path is connected with described inner space with any person in described high-voltage path by described three-way valve.

4. the rotary compressor according to any one of claims 1 to 3, is characterized in that:

Described first safety check and described second safety check are formed in the end face direction of described piston.

5. the rotary compressor according to any one of claims 1 to 3, is characterized in that:

The sectional area of described alternate path is greater than the sectional area of described first path.

6. the rotary compressor according to any one of claims 1 to 3, is characterized in that:

Described first safety check and described second safety check are made up of leaf valve.

7. the rotary compressor according to any one of claims 1 to 3, is characterized in that:

Described second safety check is made up of plunger and plunger spring.

8. the rotary compressor according to any one of claims 1 to 3, is characterized in that:

When described cylinder body is defined as the first cylinder body, described piston is defined as first piston, described blade is defined as the first blade, described working room is defined as the first working room, when described compressing mechanism is defined as the first compressing mechanism,

This rotary compressor also has the second cylinder body, the second piston, the second blade and the second working room, and comprises the second compressing mechanism of the second piston described in the described engine-driving that utilizes and share with described first compressing mechanism,

The inside of described seal container and described first working room are separated in described inner space, and described inner space is not communicated with described second working room.

9. rotary compressor as claimed in claim 8, is characterized in that:

Described first working room is positioned at below vertical relative to described second working room.

10. the rotary compressor according to any one of claims 1 to 3, is characterized in that, comprising:

The inverter of described motor is driven with arbitrary rotating speed; With

Control the control device of described inverter.

11. rotary compressors according to any one of claims 1 to 3, is characterized in that:

Refrigeration agent as described working fluid adopts high-density refrigerant, adopts R410A, carbon dioxide, R32, R407C, HFO-1234yf or R134a.