CN207420859U - Screw compressor and with its air conditioner - Google Patents

Abstract

The utility model provides a kind of screw compressor and with its air conditioner, wherein, screw compressor includes：Fixed scroll, orbiter and the adjusting part being arranged on fixed scroll.The backpressure passage of connection discharge chambe and back pressure chamber is provided on orbiter, adjusting part includes the middle pressure adjusting block being arranged between backpressure passage and back pressure chamber.The adjusting communicating passage connected with back pressure chamber is provided on middle pressure adjusting block and there is predetermined motion track to change the position of adjusting communicating passage, backpressure passage has with adjusting the communicating position that communicating passage connects and the blocking position to stagger with adjusting communicating passage, and communicating position and blocking position change with the position for adjusting communicating passage and changed.The operating condition that the utility model efficiently solves screw compressor in the prior art cannot effectively adjust back pressure chamber pressure when deviateing, the problem of causing back pressure chamber pressure surplus or insufficient pressure, and then may influence screw compressor efficiency and reliability.

Description

Screw compressor and with its air conditioner

Technical field

The utility model is related to field of air conditioning, in particular to a kind of screw compressor and with its air conditioner.

Background technology

Screw compressor is that a kind of efficient, noise is low and the positive displacement compressor of smooth running, extensively should in recent years For in air-conditioning and refrigeration unit.In general, screw compressor is by sealing shell, orbiter, fixed scroll, bent axle, anti- The parts such as free-wheeling system and motor form.It forms several to crescent moon Shape closed by a pair of intermeshing dynamic and static scroll wrap Operating room.Under bent axle driving, orbiter makees the translation without rotation, the moon around fixed scroll center to fix the radius of gyration Tooth operating room is constantly moved to center, and volume constantly reduces and pressure constantly raises, until being communicated with central exhaust port, high pressure Refrigerant is discharged the pump housing, suction and compression so as to fulfill refrigerant.

In the screw compressor course of work, in scroll plate the effects that due to gas force, centrifugal force, it is made to topple or mutually de- Aggravate from gas leakage is caused with friction.The prior art is usually with orbiter or fixed scroll relocatable form, and at it backwards Scrollwork one side sets back pressure chamber, so as to generate back pressure to balance overturning effect power or torque, realizes close between dynamic and static vortex Envelope.But back pressure design is unreasonable, directly affects compressor performance and reliability；If back pressure is superfluous, the orbiting and fixed scroll Between to be adjacent to active force excessive, friction power loss, which increases even, there is abrasion, adhesion, and performance and reliability is caused to decline；If the back of the body Insufficient pressure, orbiter topple, vortex pump housing serious leak, and refrigerating capacity declines, and power consumption increases, and delivery temperature is inclined Height also causes performance and reliability to decline.Therefore, design suitable back pressure be screw compressor realize high efficiency with it is highly reliable The key technology of property.

The patent of Application No. 201210023627.X discloses a kind of screw compressor back-pressure structure, but the patent discloses The backpressure passage of screw compressor when passing through the notch of fixed scroll gases at high pressure be directly entered back pressure chamber, it is suitable to provide Back-pressure.It is susceptible to that back-pressure is excessive or back pressure pressure when the actual condition off-design operating mode of screw compressor Hypodynamic situation directly affects screw compressor efficiency and reliability.

Utility model content

The utility model is intended to provide a kind of screw compressor and with its air conditioner, to solve prior art mesoscale eddies The operating condition of compressor cannot effectively adjust back pressure chamber pressure when deviateing, and cause back pressure chamber pressure surplus or pressure not Enough, the problem of and then screw compressor efficiency and reliability may being influenced.

To achieve these goals, one side according to the present utility model provides a kind of screw compressor, including： Fixed scroll is provided with air entry and exhaust outlet on fixed scroll；Discharge chambe is formed between orbiter, with fixed scroll, is moved The backpressure passage of connection discharge chambe and back pressure chamber is provided in scroll plate；Adjusting part is arranged on fixed scroll, adjusting part Including the middle pressure adjusting block being arranged between backpressure passage and back pressure chamber, the tune connected with back pressure chamber is provided on middle pressure adjusting block Save communicating passage, it is middle pressure adjusting block have predetermined motion track so that adjust communicating passage position can change, backpressure passage With with adjusting the communicating position that communicating passage connects and the blocking position to stagger with adjusting communicating passage, communicating position and resistance Disconnected position changes with the position for adjusting communicating passage and is changed.

Further, adjusting part further includes driving structure, and adjusting block is pressed in driving structure driving along predetermined motion track It is mobile.

Further, fixed scroll has middle pressure adjusting block accommodating chamber, and middle pressure adjusting block is rotatably arranged in middle pressure and adjusts In locking nub accommodating chamber.

Further, middle pressure adjusting block includes bar portion and is arranged on the head of the first end of bar portion, adjusts communicating passage and sets It puts on head, there is gap between the side wall of head and middle pressure adjusting block accommodating chamber, so as to adjust communicating passage and back pressure chamber Connection.

Further, the radial dimension on head is more than the radial dimension of bar portion.

Further, the junction on bar portion and head is provided with sealing ring.

Further, adjusting communicating passage includes the first communicating passage that can be connected with backpressure passage and connection first Second communicating passage of communicating passage and back pressure chamber, the first communicating passage is along the axially extending of head, and the second communicating passage is along head Portion radially extends.

Further, the cross section of the first communicating passage includes the first arc section being arranged concentrically and the second arc section, connects The three-arc section that is connected between the first end of the first arc section and the first end of the second arc section and it is connected to the first circular arc The 4th arc section between the second end of section and the second end of the second arc section, three-arc section respectively with the first arc section and the Two arc sections are tangent, and the 4th arc section is tangent with the first arc section and the second arc section respectively.

Further, backpressure passage includes introduction hole, and when backpressure passage is in communicating position, introduction hole is adjusted in middle pressure Projection on block is between the first arc section and the second arc section.

Further, adjust communicating passage further include connection the first communicating passage and the second communicating passage third connecting lead to Road, the cross section of third connecting passage is circle, circular tangent with the first arc section and the second arc section.

Further, fixed scroll has driving structure accommodating chamber, and driving structure is movably disposed at driving structure appearance Receive intracavitary.

Further, driving structure accommodating chamber includes the admission pressure chamber being connected with air entry and is connected with exhaust outlet Logical discharge plenum, driving structure is between admission pressure chamber and discharge plenum and in admission pressure chamber and pressure at expulsion It is moved under the pressure difference of chamber.

Further, adjusting part further includes the elastic component being arranged in admission pressure chamber, and elastic component is supported with driving structure Connect cooperation.

Further, driving structure and middle pressure adjusting block are perpendicular, and driving structure is that can be moved along the radial direction of fixed scroll Dynamic rack, the second end of bar portion are provided with and rack meshed gears.

Further, fixed scroll includes fixed block, and driving structure accommodating chamber is arranged in fixed block.

Further, one end of driving structure accommodating chamber is blind end, and the other end is open end, is set at open end limited Position block.

Further, it is provided with sealing ring between the side wall of driving structure and driving structure accommodating chamber.

Further, driving structure can be moved with middle pressure adjusting block coaxial arrangement, driving structure along the axial direction of fixed scroll It is dynamic, driving rotating screw face is provided in driving structure, the second end of bar portion is provided with driving rotating screw face matched It is driven in rotation helicoid.

Further, the first plane is additionally provided between the beginning and end in driving rotating screw face, is driven in rotation spiral shell It is additionally provided between the beginning and end of radial facing and matched second plane of the first plane.

Further, fixed scroll includes cover board and guide finger, and guide finger is movably threaded through in cover board, and with driving Structure is fixedly connected.

Further, guide finger deviates the axis setting of driving structure.

Further, the air-breathing communicating passage of connection air entry and admission pressure chamber is provided in fixed scroll.

Further, driving structure is servomotor, and the motor shaft of servomotor presses adjusting block predetermined in can controlling It is moved in motion track.

Another aspect according to the present utility model provides a kind of air conditioner, and including screw compressor, screw compressor is Above-mentioned screw compressor.

Another aspect according to the present utility model provides a kind of control method of screw compressor, above-mentioned for controlling Screw compressor, comprise the following steps：Obtain the pressure of inspiration(Pi) and pressure at expulsion of screw compressor；According to pressure of inspiration(Pi) and row The difference of atmospheric pressure adjusts the rotational angle of the motor shaft of the servomotor of screw compressor.

Using the technical solution of the utility model, the middle pressure adjusting block of adjusting part is movably disposed at fixed scroll In, when the actual condition of screw compressor is not inconsistent with design conditions, middle pressure adjusting block can become according to the pressure of actual condition Change or movement makes adjusting communicating passage be moved to corresponding position in predetermined motion track under system control, and then limit the back of the body Pressure passageway and the communicating position and blocking position for adjusting communicating passage, it is real so as to control the pressure into the refrigerant of back pressure chamber Now to the control and regulation of back pressure chamber pressure, back pressure chamber pressure is made to maintain in proper range.The utility model can avoid dynamic whirlpool Capstan is separated because back pressure is insufficient with fixed scroll, gas leakage occurs, the situation that orbiter topples；It is avoided that again simultaneously dynamic It is excessive that active force is adjacent between fixed scroll, increases friction power loss and even occurs wearing, adhere, and then cause screw compressor Energy and reliability decrease.

Description of the drawings

The accompanying drawings which form a part of this application are used to provide a further understanding of the present invention, this practicality New schematic description and description does not form the improper restriction to the utility model for explaining the utility model. In the accompanying drawings：

Fig. 1 shows the schematic cross-sectional view of the embodiment one of screw compressor according to the present utility model；

Fig. 2 shows the broken section structure diagram of the fixed scroll of the screw compressor of Fig. 1；

Fig. 3 shows close-up schematic view at the A of the screw compressor of Fig. 2；

Fig. 4 shows the half section structure diagram of the fixed scroll of the screw compressor of Fig. 1；

Fig. 5 shows close-up schematic view at the B of the fixed scroll of Fig. 4；

Fig. 6 shows close-up schematic view at the C of the fixed scroll of Fig. 4；

Fig. 7 shows the present invention looks up structural representation of the fixed scroll of Fig. 4；

Fig. 8 shows the D-D of the fixed scroll of Fig. 7 to schematic cross-sectional view；

Fig. 9 shows the perspective structure schematic diagram of the middle pressure adjusting block in the fixed scroll of Fig. 2；

Figure 10 shows mated condition schematic diagram of the driving structure of Fig. 2 with middle pressure adjusting block under working condition 1；

Figure 11 shows mated condition schematic diagram of the driving structure of Fig. 2 with middle pressure adjusting block under working condition 2；

Figure 12 shows the first communicating passage of Fig. 2 and the running orbit schematic diagram of introduction hole；

Figure 13 shows course of work schematic diagram of the adjusting part of Fig. 2 under working condition 1；

Figure 14 shows course of work schematic diagram of the adjusting part of Fig. 2 under working condition 2；

Figure 15, which is shown in the adjusting part of Fig. 2, compresses chamber pressure-crank angle relation schematic diagram；

Figure 16 shows that operating mode pressure difference is illustrated with crank angle, spring works length relation curve in the adjusting part of Fig. 2 Figure；

Figure 17 shows the screw compressor range of operation of Fig. 1 and back pressure nargin relation schematic diagram；

Figure 18 shows the screw compressor range of operation of Fig. 1 and back pressure relation schematic diagram；

Figure 19 shows the screw compressor range of operation of Fig. 1 and back pressure relation schematic diagram；

Figure 20 shows the schematic cross-sectional view of the embodiment two of screw compressor according to the present utility model；

Figure 21 shows the broken section structure diagram of the fixed scroll of the screw compressor of Figure 20；

Figure 22 shows the half section structure diagram of the fixed scroll of the screw compressor of Figure 21；

Figure 23 shows the structure diagram of the middle pressure adjusting block of Figure 22；

Figure 24 shows course of work schematic diagram of the adjusting part of Figure 21 under working condition 1；

Figure 25 shows the schematic cross-sectional view of the embodiment three of screw compressor according to the present utility model；

Figure 26 shows the close-up schematic view of the screw compressor of Figure 25；

Figure 27 shows the system schematic of the embodiment of air conditioner according to the present utility model；And

Figure 28 shows the control flow chart of the adjusting part of the air conditioner of Figure 27.

Wherein, above-mentioned attached drawing is marked including the following drawings：

1st, screw compressor；3rd, motor driving part part；4th, adjusting part；10th, air-breathing side region；11st, discharge chambe；12nd, arrange Gas side region；13rd, middle pressure back pressure chamber；14th, ridge of high pressure intermediate pressure section；15th, reserve；100th, housing；101st, air intake duct；102nd, it is vented Pipe；201st, fixed scroll；201a, air entry；201b, exhaust outlet；201c, air-breathing communicating passage；201d, middle pressure adjusting block accommodate Chamber；201e, middle pressure communication groove；202nd, orbiter；202a, fairlead；202b, middle pressure communicating passage；202c, introduction hole； 203rd, upper bracket；203a, upper bracket drainback passage；204th, bent axle；204a, oil supply gallery；205th, cross slip-ring；206th, lower branch Frame；207th, sealing bolt；208th, sealing ring；209th, driving bearing；210th, base bearing；211st, supplementary bearing；212nd, thrust bearing； 213rd, fuel sucking pipe；214th, oil guide piece；215th, oil return sheet metal component；301st, rotor；302nd, stator；401st, middle pressure adjusting block；401a, One communicating passage；401b, the second communicating passage；402nd, rack；403rd, spring；404th, gear；405th, fixed block；405a, driving Structure accommodating chamber；406th, sealing ring；407th, sealing ring；408th, sealing ring；409th, limited block；410th, fastening bolt；501st, in Press adjusting block；501a, the first communicating passage；501b, the second communicating passage；501c, it is driven in rotation helicoid；502nd, driving knot Structure；502a, guide pin hole；502b, seal groove；502c, driving rotating screw face；503rd, spring；504th, plane scroll spring； 505th, sealing ring；506th, sealing ring；507th, fastening bolt；508th, cover board；508a, high-pressure channel；509th, guide finger；601st, middle pressure Adjusting block；602nd, servomotor；603rd, sealing ring；604th, fastening bolt；605th, binding post；701st, outdoor unit；702nd, indoor unit； 703rd, throttle valve；704th, four-way reversing valve；705th, monitoring and Operations Analysis.

Specific embodiment

Below in conjunction with the attached drawing in the embodiment of the present application, the technical solution in the embodiment of the present application is carried out clear, complete Site preparation describes, it is clear that described embodiments are only a part of embodiments of the present application, instead of all the embodiments.Below Description only actually at least one exemplary embodiment is illustrative, is never used as to the application and its application or makes Any restrictions.Based on the embodiment in the application, those of ordinary skill in the art are not making creative work premise Lower all other embodiments obtained, shall fall in the protection scope of this application.

It should be noted that term used herein above is merely to describe specific embodiment, and be not intended to restricted root According to the illustrative embodiments of the application.As used herein, unless the context clearly indicates otherwise, otherwise singulative It is also intended to include plural form, additionally, it should be understood that, when in the present specification using term "comprising" and/or " bag Include " when, indicate existing characteristics, step, operation, device, component and/or combination thereof.

Unless specifically stated otherwise, the component and positioned opposite, the digital table of step otherwise illustrated in these embodiments Up to the unlimited scope of the present application processed of formula and numerical value.Simultaneously, it should be appreciated that for ease of description, each portion shown in attached drawing The size divided not is to be drawn according to actual proportionate relationship.For technology, side known to person of ordinary skill in the relevant Method and equipment may be not discussed in detail, but in the appropriate case, the technology, method and apparatus should be considered as authorizing explanation A part for book.In shown here and discussion all examples, any occurrence should be construed as merely illustrative, and Not by way of limitation.Therefore, the other examples of exemplary embodiment can have different values.It should be noted that：Similar label Similar terms is represented in following attached drawing with letter, therefore, once it is defined in a certain Xiang Yi attached drawing, then subsequent attached It need not be further discussed in figure.

Embodiment one：

As shown in Figure 1, the screw compressor of embodiment one includes fixed scroll 201, orbiter 202 and adjusting part 4. Wherein, fixed scroll 201 and orbiter 202 are arranged in housing 100, and are passed through upper bracket 203 and be rigidly attached to housing 100 Superjacent air space in.Lower carriage 206 is rigidly connected in the underlying space of housing 100, and base bearing 210 is arranged at upper bracket 203, secondary Bearing 211 is arranged at lower carriage 206, and the two jointly in radial directions plays a supportive role to bent axle 204.Lower carriage 206 simultaneously Lower section set thrust bearing 212, to play a supportive role in the axial direction to bent axle 204.Motor driving part part 3 is arranged in Between stent 203 and lower carriage 206, stator 302 realizes rigid connection, rotor 301 and bent axle with the interference fit of housing 100 204 realize rigid connection also by interference fit.301 relative stator 302 of rotor can rotate at a high speed, so as to pass through motor driving part Part 3 controls bent axle 204 to rotate, and then the convolution that orbiter 202 is driven to make certain radius of gyration around 201 center of fixed scroll is put down It is dynamic.

Specifically, as shown in Figure 1 to Figure 3, the fixed scroll 201 of the present embodiment is rigidly communicated in upper bracket by bolt 203, orbiter 202 is mounted between upper bracket 203 and fixed scroll 201.Fixed scroll 201 has with orbiter 202 There is a scroll wrap, two scroll wrap relative eccentrics and with 180 ° of opposed installations of phase difference, to realize intermeshing dynamic and static vortex tooth form Into the operating room of multipair crescent moon Shape closed.As shown in Figure 1, the back side of orbiter 202 is provided with bearing chamber and interference is equipped with Driving bearing 209, driving bearing 209 are mutually nested with the eccentric part of 204 upper end of bent axle.Orbiter 202 passes through cross slip-ring 205 couple with upper bracket 203, and cross slip-ring 205 can prevent orbiter 202 from rotation occurs.Said structure makes orbiter 202 can make convolution translation under the driving of bent axle 204 around the center of fixed scroll 201.

During above-mentioned convolution translation, the operating room of crescent is according to phase between fixed scroll 201 and orbiter 202 Suction muffler and discharge chambe can be formed to the difference of motion state, the gas pressure in operating room gradually increases.Fixed scroll 201 On be provided with air entry 201a and exhaust outlet 201b, between orbiter 202 and fixed scroll 201 formed discharge chambe 11.By The high pressure refrigerant of compression is expelled to exhaust side region 12 from exhaust outlet 201b, so as to fulfill the suction and compression of refrigerant.Dynamic whirlpool The backpressure passage of connection discharge chambe 11 and back pressure chamber is provided on capstan 202, adjusting part 4 is arranged on fixed scroll 201, Adjusting part 4 includes the middle pressure adjusting block 401 being arranged between backpressure passage and back pressure chamber, is set on medium pressure adjusting block 401 The adjusting communicating passage connected with the back pressure chamber is equipped with, medium pressure adjusting block 401 has predetermined motion track so that described Adjusting the position of communicating passage can change, backpressure passage have with adjust the communicating position that connects of communicating passage and with adjusting The blocking position that communicating passage staggers, communicating position and blocking position adjust the position of communicating passage with medium pressure communicating passage Change and change.

Using the technical solution of the present embodiment, the middle pressure adjusting block 401 of adjusting part 4 is movably disposed at fixed scroll In 201, when the actual condition of screw compressor is not inconsistent with design conditions, middle pressure adjusting block 401 can be according to actual condition Pressure change or system control under movement adjusting communicating passage is made to be moved to corresponding position in predetermined motion track, and then Backpressure passage is limited with adjusting the communicating position and blocking position of communicating passage, so as to control the pressure into the refrigerant of back pressure chamber Power realizes the control and regulation to back pressure chamber pressure, and back pressure chamber pressure is made to maintain in proper range.The utility model can avoid Orbiter 202 is separated because back pressure is insufficient with fixed scroll 201, gas leakage occurs, the situation that orbiter 202 topples； It is avoided that between the orbiting and fixed scroll that be adjacent to active force excessive again simultaneously, increases friction power loss and even occur wearing, adhere, and then lead Screw compressor Performance And Reliability is caused to decline.

For ease of processing, as shown in Fig. 1, Fig. 4 and Fig. 6, the backpressure passage of the present embodiment includes fairlead 202a, middle pressure company Circulation passage 202b and introduction hole 202c.Wherein, fairlead 202a and introduction hole 202c is set along the axial direction of orbiter 202, in The radial direction of pressure communicating passage 202b along orbiter 202 sets and connects fairlead 202a and introduction hole 202c, middle pressure connection are led to Road 202b is provided with sealing structure close to the one end at 202 edge of orbiter.Preferred sealing structure is sealing bolt 207.

Further, as shown in Figures 2 to 6, the adjusting part 4 of the present embodiment further includes driving structure, driving structure energy Pressure adjusting block 401 is moved along predetermined motion track in enough drivings, so that discharge chambe 11 is selectively communicated with back pressure chamber.Driving knot Structure can detect the actual condition of screw compressor, and then the company of discharge chambe 11 and back pressure chamber is controlled by middle pressure adjusting block 401 Logical scope, so as to adjust the size of back pressure chamber gas pressure, makes back pressure chamber pressure be maintained in ideal range, avoids back-pressure It is excessive or insufficient, influence screw compressor efficiency and reliability.

As shown in Fig. 6, Fig. 7 and Figure 12, middle pressure communication groove 201e is additionally provided on the fixed scroll 201 of the present embodiment, Enable from the refrigerant that the second communicating passage 401b flows out communication groove 201e therefrom to be pressed to flow to back pressure chamber.

Specifically, as described in Figure 8, the middle pressure adjusting block 401 of the present embodiment is pivotally disposed in fixed scroll 201 It presses in adjusting block accommodating chamber 201d, middle pressure adjusting block 401 includes bar portion and is arranged on the head of the first end of bar portion, adjusts connection Passage is arranged on head, has gap between the side wall of head and middle pressure adjusting block accommodating chamber 201d, so that it is logical to adjust connection Road connects always with back pressure chamber.

With backpressure passage similarly, as shown in fig. 6, the adjusting communicating passage of the present embodiment includes setting along the axial direction on head The first communicating passage 401a, along head radial direction set the second communicating passage 401b and connection the first communicating passage 401a With the third connecting passage of the second communicating passage 401b.The gas flowed out from introduction hole 202c can pass through the first communicating passage 401a and the second communicating passage 401b enter back pressure chamber through the gap between orbiter 202 and upper bracket 203 again, to provide reason Back-pressure in the range of thinking makes orbiter 202 that can keep contacting with fixed scroll 201, ensures the sealing of discharge chambe 11 Property, orbiter 202 is avoided to be separated with fixed scroll 201, and then gas leakage occurs, the situation that orbiter 202 topples；Again It is avoided that between the orbiting and fixed scroll that be adjacent to active force excessive, increases friction power loss and even occur wearing, adhere, and then cause to be vortexed Compressor performance and reliability decrease.

Specifically, as shown in figure 12, the cross section of the first communicating passage 401a includes four arcs section, wherein the first circular arc Section and the second arc section are arranged concentrically, and three-arc section is connected to the first end of the first arc section and the first end of the second arc section Between, the 4th arc section is connected between the second end of the first arc section and the second end of the second arc section.Three-arc section point Not tangent with the first arc section and the second arc section, the 4th arc section is tangent with the first arc section and the second arc section respectively.On Stating structure makes the first communicating passage 401a have the segment limit overlapped with introduction hole 202c.

As shown in Fig. 6, Figure 12 to Figure 14, orbiter 202 can do convolution translation under the driving of bent axle 204, and convolution is flat Dynamic track is circle.And then the introduction hole 202c of backpressure passage can with the convolution of orbiter 202 be translatable can generate it is identical Circular trace, the first communicating passage 401a along desired trajectory cover predetermined length.As introduction hole 202c and the first communicating passage When 401a is overlapped, backpressure passage is connected with adjusting communicating passage, and then is connected with back pressure chamber, and gas can enter from discharge chambe 11 Back pressure chamber；When introduction hole 202c and the first communicating passage 401a stagger completely, backpressure passage is disconnected with communicating passage, and gas is not Discharge chambe 11 can be flowed out.The above process orbiter make convolution translation each cycle in, the first communicating passage 401a with Introduction hole 202c is intermittently connected, the crank angle position corresponding to connection or open position, depending on middle pressure is adjusted The rotational angle of block 401.

Specifically, as shown in figure 12, O is introduction hole 202c compared with the middle movement locus for pressing adjusting block 401, introduction hole 202c is rotated counterclockwise compared with the axis of middle pressure adjusting block 401, and when introduction hole 202c is located at P1 positions, operating room completes to inhale Gas process, operating room close to form discharge chambe.When introduction hole 202c is moved from P1 to P2 positions, introduction hole 202c and first connects Circulation passage 401a staggers, and backpressure passage is disconnected with adjusting communicating passage, and gas compresses in discharge chambe 11, air pressure increase.When drawing When entering hole 202c and being moved from P2 to P3 positions, introduction hole 202c and the first communicating passage 401a have intersection, backpressure passage It is connected with adjusting communicating passage, gas flows to back pressure chamber to provide back-pressure from discharge chambe 11.

Since the gas pressure in introduction hole 202c when orbiter 202 moves to track different position is different, and then work as The pressure of the gas flowed into when first communicating passage 401a is located at the different position of movement locus in back pressure chamber also differs, so as to Realize the purpose for adjusting back pressure chamber back-pressure.Footprint when discharge chambe 11 is connected with back pressure chamber depends on the first connection The radian size of passage 401a.

Specifically, as shown in Figure 1, the back pressure chamber of the screw compressor of the present embodiment includes middle pressure back pressure chamber 13 and ridge of high pressure Intermediate pressure section 14, wherein ridge of high pressure intermediate pressure section 14 are that upper bracket 203 avoids the chamber that bent axle 204 rotates formation, and upper bracket 203 is with moving Other positions between scroll plate 202 form middle pressure back pressure chamber 13.Pass through between middle pressure back pressure chamber 13 and ridge of high pressure intermediate pressure section 14 208 parting seal of sealing ring, above-mentioned backpressure passage connection discharge chambe 11 and middle pressure back pressure chamber 13.

As shown in Figure 1, the lower inside of the housing 100 of the present embodiment is provided with reserve 15, and in 204 lower end of bent axle Oil guide piece 214 and fuel sucking pipe 213 are installed, oil supply gallery 204a is provided in bent axle 204, is provided in upper bracket 203 Upper bracket drainback passage 203a, so as to be formed for oil circulation path.Sealing ring 208 is equipped with notch so that ridge of high pressure intermediate pressure section 14 In refrigeration oil can enter in press back pressure chamber 13, with centering pressure back pressure chamber 13 in friction pair be lubricated with cooling etc..

The convolution translation of 204 high speed rotation driving orbiter 202 of bent axle, operating room generates suction and compression.Meanwhile Due to the pumping effect of oil guide piece 214, the refrigeration oil in reserve 15 is delivered to the upper end areas of bent axle 204 through oil supply gallery 204a Domain, and enter ridge of high pressure intermediate pressure section 14 through the gap between driving bearing 209 and bent axle 204 or trimming passage.At this point, big portion Point refrigeration oil is back to reserve 15 through upper bracket drainback passage 203a, oil return sheet metal component 215.Another fraction refrigeration oil is through close The notch of seal 208 presses back pressure chamber 13 in entering, secondary to each friction to carry out cooling and lubricating, and through orbiter 202 and quiet vortex The backpressure passage of binding face between disk 201 or middle pressure back pressure chamber 13 and discharge chambe 11 enters discharge chambe 11, to scroll wrap it Between friction secondary play lubrication, cooling and sealing function.While fuel feeding cycles progress, refrigerant goes out from system evaporator The air intake duct 101 of mouth connection enters the air-breathing side region 10 of screw compressor, and enters orbiter 202 and fixed scroll 201 The operating room that scrollwork tooth engagement is formed, operating room is suction muffler at this time.With the continuous driving of bent axle 204, suction muffler closing And starting to be collapsed into discharge chambe 11, the gas in discharge chambe 11 continues to reach certain pressure by compression, through fixed scroll 201 Exhaust outlet 201b or relief hole (not shown) enter exhaust side region 12, and then refrigerant flows through 3 institute of motor driving part part Locate space and motor driving part part 3 is cooled down, be then expelled to air-conditioning system condenser from exhaust pipe 102.

The thrust that middle pressure back pressure chamber 13 generates is Fb1, and the thrust that ridge of high pressure intermediate pressure section 14 generates is Fb2, then back pressure chamber produces Raw thrust Fb=Fb1+Fb2.The back pressure realizes dynamic vortex to balance the overturning effect power of orbiter 202 or torque It is sealed between disk 202 and fixed scroll 201.

Further, as shown in Figure 4 and Figure 5, the driving structure of the present embodiment is movably disposed at fixed scroll 201 In driving structure accommodating chamber 405a, driving structure accommodating chamber 405a include the admission pressure chamber that is connected with air entry 201a and The discharge plenum being connected with exhaust outlet 201b.When the intake pressure Ps and exhaust air pressure Pd of screw compressor change and lead When causing actual condition off-design operating mode, driving structure is produced under the action of both sides admission pressure chamber and the pressure difference of discharge plenum Raw movement, and then in controlling adjusting block 401 is pressed to rotate, realize the purpose of above-mentioned adjustment back pressure chamber back-pressure.

Specifically, as shown in figure 3, the driving structure of the present embodiment and middle pressure adjusting block 401 are perpendicular, set in driving structure Be equipped with rack 402, the second end of the bar portion of middle pressure adjusting block 401 is provided with the gear 404 coordinated with rack 402, gear 404 with Bar portion interference fit is rotated synchronously with realizing.When driving structure moves left and right, middle pressure adjusting block 401 can be in 402 He of rack It is correspondingly rotated clockwise or counterclockwise under the action of gear 404, and then adjusts the first communicating passage 401a on movement locus Position.

Further, as depicted in figs. 1 and 2, the fixed scroll 201 of the present embodiment includes fixed block 405, driving structure Accommodating chamber 405a is arranged in fixed block 405, and limited block 409 is provided in fixed block 405.Adjusting part 4 further includes setting Elastic component in admission pressure chamber, elastic component are abutted with driving structure.Elastic component is preferably spring 403, and the first of spring 403 End is fixed on fixed block 405, and second end and the driving structure of spring 403 abut against.The admission pressure F1 that driving structure is subject to With spring force Fk make a concerted effort it is equal with pressure at expulsion F2 so that driving structure can be with admission pressure chamber and discharge plenum The variation movement of pressure difference.Wherein, admission pressure F1=active areas S1 × intake pressure Ps, pressure at expulsion F2=active areas S2 × exhaust air pressure Pd, spring force Fk=coefficient of elasticity K × (the former long L0- springs of spring show long L1), it is reasonable to be needed according to structure Above-mentioned parameter is designed, makes Fk=K × (L0-L1)=F1-F2=S × (Pd-Ps).At this point, in different operating mode pressure differences (Pd-Ps) Under conditions of, driving structure can be back and forth run to different positions, that is to say, that in the item of different operating mode pressure differences (Pd-Ps) Under part, it can determine that each position of driving structure and each operating mode pressure difference are corresponding one by one.And then rack 402 is mutually nibbled with gear 404 Close transmission, make it is middle pressure adjusting block 401 rotate to operating mode pressure difference (Pd-Ps) corresponding position.In brief, i.e., according to operating mode The position of the first communicating passage 401a can be adjusted in pressure difference (Pd-Ps), so as to which centering pressure back pressure chamber 13 connects with discharge chambe 11 Lead to or disconnect corresponding crank angle position and be adjusted, it is corresponding when being connected so as to fulfill middle pressure back pressure chamber 13 with discharge chambe 11 Crank angle can adaptively adjust or be controlled according to operating condition.

Specifically, as shown in Figure 13 and Figure 17, screw compressor causes to press in pressure at expulsion much larger than pressure of inspiration(Pi) at this time The larger 1 time operation of actual working conditions of difference, this actual working conditions 1 are in back pressure surplus region.As 1. shown in Figure 13, Corresponding crank angle θ 0 is defined as zero-bit when being closed with inboard compression room air-breathing, and orbiter 202 is with respect to fixed scroll 201 It rotates counterclockwise, at this point, the fairlead 202a of orbiter 202 is connected with inboard compression room 11；As 2. shown, in inboard compression After room 11 air-breathing is closed, when 204 corner of bent axle is θ 1-1, the first communicating passage 401a starts to connect with introduction hole 202c, i.e., in Back pressure chamber 13 is pressed to be interconnected with discharge chambe 11；As 3. shown, when the rotational angle theta 1-2 of bent axle 204 is between θ 1-1 to θ 1-3, The refrigerant of corresponding pressure presses back pressure chamber 13 in can entering from backpressure passage and communicating passage；As 4. shown, when bent axle 204 revolves When going to rotational angle theta 1-3, the first communicating passage 401a and introduction hole 202c is fully disconnected, i.e., middle pressure back pressure chamber 13 and discharge chambe 11 It does not connect.

As shown in Figure 10, the pressure at expulsion F2 that the driving structure hand of the present embodiment arrives at this time is more than pressure of inspiration(Pi) F1 and spring Elastic force Fk's makes a concerted effort, and driving structure is moved to the left so that stress balance, and middle pressure adjusting block 401 is rotated by rack 402, First communicating passage 401a goes to position in Figure 13, and middle pressure back pressure chamber 13 is made to start to connect in the more forward position of crank angle. 1 time compression chamber pressure-crank angle curve of working condition as shown in figure 15, it is middle under the operating mode to press back pressure chamber 13 more forward Position between crank angle θ 1-1 and θ 1-3 is connected with discharge chambe 11, obtains relatively small middle pressure back pressure Pmid1 values, from And the smaller middle pressure back pressure of scheme compared with the prior art is obtained, solve back pressure surplus region working condition operation back pressure mistake It is surplus, and appropriate back pressure is provided to meet the needs of vortex pump housing leakproofness and even running for orbiter 202, it avoids It is excessive that active force is adjacent between the orbiting and fixed scroll, friction power loss, which increases even, abrasion, adhesion occurs, exists so as to improve compressor The performance and reliability of the operation area.

Another situation, as shown in Figure 14 and Figure 17, screw compressor is led in pressure at expulsion much smaller than pressure of inspiration(Pi) at this time The 2 times operations of the smaller actual working conditions of pressure difference are caused, this actual working conditions 2 is in back pressure deficiency region.As in Figure 14 1. Shown, corresponding crank angle θ 0 is defined as zero-bit when being equally closed with inboard compression room air-breathing, and orbiter 202 is relatively quiet Scroll plate 201 rotates counterclockwise, at this point, the fairlead 202a of orbiter 202 is connected with inboard compression room 11；As 2. shown, After 11 air-breathing of inboard compression room closure, when 204 corner of bent axle is θ 2-1, the first communicating passage 401a and introduction hole 202c starts Connection, i.e., middle pressure back pressure chamber 13 are interconnected with discharge chambe 11；As 3. shown, when the rotational angle theta 2-2 of bent axle 204 is in θ 2-1 to θ 2- When between 3, the refrigerant of corresponding pressure can press back pressure chamber 13 from backpressure passage and communicating passage entrance；As 4. shown, when When bent axle 204 is rotated to rotational angle theta 2-3, the first communicating passage 401a and introduction hole 202c is fully disconnected, i.e., in pressure back pressure chamber 13 with Discharge chambe 11 does not connect.

As shown in figure 11, the pressure at expulsion F2 that the driving structure hand of the present embodiment arrives at this time is less than pressure of inspiration(Pi) F1 and spring Elastic force Fk's makes a concerted effort, and driving structure moves right so that stress balance, and middle pressure adjusting block 401 is rotated by rack 402, First communicating passage 401a goes to position in Figure 14, and middle pressure back pressure chamber 13 is made to start to connect compared with rearward position in crank angle. 2 time compression chamber pressure-crank angle curves of working condition as shown in figure 15, it is middle under the operating mode to press back pressure chamber 13 more rearward Position between crank angle θ 2-1 and θ 2-3 is connected with discharge chambe 11, obtains relatively large middle pressure back pressure Pmid2 values, from And the larger middle pressure back pressure of scheme compared with the prior art is obtained, solve back pressure deficiency region working condition operation back pressure not Foot, and appropriate back pressure is provided to meet the needs of vortex pump housing leakproofness and even running for orbiter 202, it avoids The problems such as orbiter topples, vortex pump housing serious leak, and refrigerating capacity declines, and power consumption increases, and delivery temperature is higher, Performance and reliability of the compressor in the operation area can be significantly improved.

As shown in figure 16,4 centering of the adjusting part pressure back pressure chamber 13 and discharge chambe 11 in the utility model screw compressor The adjusting that connection starts with end crank position belongs to continuous stepless regulation.The connection of pressure chamber and discharge chambe in the prior art It is fixed that scope, which starts with end crank position, it is impossible to is adjusted according to the change of working condition.And this practicality The adjusting part 4 of novel scroll compressor can press back pressure chamber 13 and discharge chambe continuous stepless according to working condition in adjusting 11 start to connect or connect the crank angle position of end, different so as to be provided according to working condition for orbiter 202 And appropriate back pressure thrust.Corresponding crank angle can be according to operation when being connected so as to fulfill middle pressure back pressure chamber with discharge chambe Operating mode is adaptively adjusted or controlled.

As shown in figure 18, the regulating effect of the screw compressor of the utility model is shown as on range of operation figure：Every Working condition on the equal-pressure-difference line of item difference pressure difference, which provides, presses back pressure chamber 13 to start to connect or connect with discharge chambe 11 in difference The logical crank angle position terminated, so as to the back pressure that optimization design is suitble to and adjusting part 4.As shown in figure 19, compared to existing skill Art scheme, the utility model screw compressor can ensure that back pressure force coefficient (Mt/Mb) is suitable under different operating mode pressure differentials When so can be implemented as whole operation areas and provide suitable back pressure thrust, that is, ensure that the sealing between dynamic and static scroll plate Property；Meanwhile optimize the active force that is adjacent between the dynamic and static scroll plate of each operating mode, friction power loss is reduced, so as to improve compressor performance With reliability.On the other hand, due to the utility model screw compressor, back pressure coefficient (Mt/Mb) slope of curve is small, more puts down It is slow, and middle pressure back pressure chamber connects angle with discharge chambe and can adaptively be adjusted.So in design back-pressure structure not Need the scope that middle pressure back pressure chamber is made when taking into account all limiting conditions to connect crank angle with discharge chambe larger.In other words, Using the utility model back-pressure structure, middle pressure back pressure chamber can connect to crank angle range diminution with discharge chambe, and then can be with The indoor pressure oscillation of back pressure is pressed in diminution, back pressure is made more to stablize, so that orbiter rotates more processing steadily, favorably In reducing dynamic and static scroll plate binding face fretting wear, it is also beneficial to reduce due to orbiter galloping shaking for generating Dynamic and noise.

Further, as shown in Figures 2 to 6, it is provided with sealing ring 406 between middle pressure adjusting block 401 and fixed scroll 201 To press back pressure chamber 13 and middle pressure adjusting block accommodating chamber 201d in isolation, sealing ring 407 is provided with to be pressed in sealing on fixed block 405 Adjusting block accommodating chamber 201d and admission pressure chamber are provided with sealing ring 408 with separated exhaust between driving structure and fixed block 405 Pressure chamber and admission pressure chamber.Fixed block 405 is fixed by fastening bolt 410, and limited block 409 prevents driving structure from driving Deviate from structure accommodating chamber 405a, limited block 409 is equipped with through hole to connect exhaust side region 12.In addition, in fixed scroll 201 offer air-breathing communicating passage 201c, so that admission pressure chamber is equal with suction side areal pressure.

Embodiment two：

Compared with embodiment one, the adjusting part of embodiment two employs different fit systems instead of in embodiment one The drive mechanism of rack pinion equally realizes above-mentioned regulating effect.Specifically as shown in Figure 20 to Figure 24, the driving of embodiment two Structure 502 is coaxially disposed with middle pressure adjusting block 501, and driving rotating screw face 502c is provided in driving structure 502, and middle pressure is adjusted The second end of the bar portion of block 501 is provided with driving rotating screw face 502c is matched to be driven in rotation helicoid 501c.

It is similar with embodiment one, as shown in figure 23, the first connection is also offered in the middle pressure adjusting block 501 of the present embodiment Passage 501a and the second communicating passage 501b offers guide pin hole 502a and seal groove 502b in driving structure 502.Such as Figure 24 Shown, be driven in rotation the helicoid 501c and the driving rotating screw face 502c of driving structure 502 of middle pressure adjusting block 501 are phase The spiral camber mutually engaged, middle pressure adjusting block 501 are mounted in the middle pressure adjusting block accommodating chamber 201d of fixed scroll 201. The elastic component of the present embodiment is spring 503 and plane scroll spring 504, and middle pressure tune is fixed in one end of plane scroll spring 504 Locking nub 501, the other end are fixed in fixed scroll 201 and are pre-tightened, and plane scroll spring 504 is made to crispatura, so as to Middle pressure adjusting block 501 is enable to be rotated to one side until being driven in rotation helicoid 501c and driving rotating screw face 502c mutual It is close to.On the other hand, one end of spring 503 acts on fixed scroll 201, and the other end acts on driving structure 502, ties driving Structure 502 can reset.

As shown in figure 24, the driving structure 502 of the present embodiment can be moved up and down when pressure difference changes, and then pass through driving Rotating screw face 502c is rotated with pressure adjusting block 501 in helicoid 501c drivings is driven in rotation, to change the first communicating passage The purpose of above-mentioned adjusting back-pressure is realized in the position of 501a.The specific regulating effect of the present embodiment and principle and embodiment one Similar, details are not described herein.

Further, as shown in Figure 21, Figure 22 and Figure 24, the fixed scroll 201 of the present embodiment further includes cover board 508 and leads To pin 509, cover board 508 is rigidly connected by fastening bolt 507, and plays position-limiting action to the reciprocating motion of driving structure 502, with It can prevent driving structure 502 from deviating from from fixed scroll 201, guide finger 509 is threaded through in cover board 508 simultaneously freely slidablely It is interference fitted to prevent 502 rotation of driving structure with the guide pin hole 502a of driving structure 502.In order to make driving structure 502 Upper end is in pressure at expulsion, and high-pressure channel 508a is offered on cover board 508, and sealing ring 506 is set in driving structure 502. In order to the lower end of driving structure 502 is made to be in pressure of inspiration(Pi), air-breathing communicating passage 201c is offered on fixed scroll 201, and Sealing ring 505 is set to press back pressure chamber 13 in isolation.

Specifically, as shown in figure 22, the guide finger 509 of the present embodiment for straight pin and deviates the axis of driving structure 502 Line is set.Due to the eccentric configuration of guide finger 509, driving structure 502 is only capable of reciprocating along the vertical direction, it is impossible to rotation. Guide finger 509 or cuboid pin are to realize rotation stop effect in other embodiment.

Embodiment three：

Compared with the embodiment of embodiment one and embodiment two, the adjusting part of embodiment three is driven using Electric control Structure, and then in controlling adjusting block 601 is pressed to adjust back-pressure.Specifically, as illustrated in figs. 25 and 26, originally implement the drive on ground Dynamic structure is servomotor 602, and the structure of middle pressure adjusting block 601 can be identical with the middle pressure adjusting block of embodiment one.Servo electricity Machine 602 according to default calculation procedure and combine actual monitoring to the parameters such as suction, pressure at expulsion calculate middle pressure adjusting block 601 Required angle, and then more accurately adjust back-pressure.The specific regulating effect of the present embodiment and principle and embodiment one are similar Seemingly, details are not described herein.

Servomotor 602 is fixed by fastening bolt 604, and servomotor 602 is connected to for electrical lead with signal lead The binding post 605 of driving motor lead-out wire.For separated exhaust side region 12 and middle pressure back pressure chamber 13, in middle pressure adjusting block 601 Upper setting sealing ring 603.

Present invention also provides a kind of air conditioner, the air conditioner of the present embodiment includes screw compressor, wherein, scroll compression Machine is the screw compressor with technical characteristic in above-described embodiment.The air conditioner of the present embodiment has back pressure chamber pressure stability, The advantages of screw compressor efficiency and high reliability.

By taking the screw compressor of embodiment three as an example, as shown in figure 27, which includes screw compressor 1, outdoor unit 701st, indoor unit 702, throttle valve 703, four-way reversing valve 704 and monitoring and Operations Analysis 705.Monitoring and operation control Unit 705 can monitor compressor suction, pressure at expulsion and feed back to monitoring and Operations Analysis 705, the monitoring and operation control Unit 705 is connected to binding post 605, and can be transported according to working conditions such as suction, pressures at expulsion according to default program Row, and signal and instruction to driving servomotor 602 are sent, so as to which pressure adjusting block 601 is rotated to designated position in driving, and then Corresponding crank angle position is adjusted when centering pressure back pressure chamber 13 is connected or disconnected with discharge chambe 11, and back pressure is pressed in realization Room when being connected with discharge chambe corresponding crank angle can adaptively adjust or be controlled according to operating condition.

For the screw compressor of embodiment three, present invention also provides a kind of control method of compressor, such as Figure 28 institutes Show, monitoring with Operations Analysis 705 monitors and obtains pressure of inspiration(Pi) Ps and pressure at expulsion Pd first.Then obtained according to monitoring Ps, Pd and compressor design parameter K can calculate to obtain tilting moment Mt (Ps, Pd, K), and then according to Ps, Pd, Mt and compression Machine design parameter K, can calculate in press back pressure chamber needed for pressure value P mid.Finally, according to Pmid, Ps and compressor Design parameter K calculates the crank angle θ 1 needed for the initial connection of adjusting part when middle pressure back pressure chamber of sening as an envoy to obtains Pmid pressure, And control unit sends instruction, and control servomotor 602 rotates so that the middle pressure adjusting block of adjusting part turns to corner and is The designated position of θ 1.

The embodiment drives adjusting part by servomotor 602, and can be by monitoring working conditions of compressor parameter (pressure of inspiration(Pi) Ps and pressure at expulsion Pd) calculates the required back of the body according to compressor arrangement parameter and default function or formula relationship The starting crank angle position that pressure and middle pressure back pressure chamber are connected with discharge chambe, and send instruction and servomotor is allowed to press tune in driving Locking nub is rotated to the position, so as to fulfill the automatic adjusument of back pressure.Therefore, the program can not only according to pressure difference, but also It can be adjusted according to pressure ratio or according to preset calculation procedure centering press mechanism, further improve back pressure The ability of automatic adjusument.

It can be seen from the above description that the above embodiments of the present invention achieve the following technical effects：

The middle pressure adjusting block of adjusting part is movably disposed in fixed scroll, when screw compressor actual condition with When design conditions are not inconsistent, middle pressure adjusting block movement can make adjusting according to the pressure change of actual condition or under system control Communicating passage is moved to corresponding position in predetermined motion track, and then limits backpressure passage with adjusting the connection position of communicating passage It puts and blocking position, so as to control the pressure into the refrigerant of back pressure chamber, realizes the control and regulation to back pressure chamber pressure, make the back of the body Pressure chamber pressure is maintained in proper range.The utility model can avoid orbiter because of back pressure deficiency and fixed scroll point From there is gas leakage, orbiter situation about toppling；It is avoided that between the orbiting and fixed scroll that be adjacent to active force excessive again simultaneously, Increase friction power loss even to occur wearing, adhere, and then screw compressor Performance And Reliability is caused to decline.

In the description of the present application, it is to be understood that the noun of locality such as " forward and backward, upper and lower, left and right ", " laterally, vertical, Vertically, orientation or position relationship indicated by level " and " top, bottom " etc. are normally based on orientation or position shown in the drawings and close System is for only for ease of description the application and simplifies description, and in the case where not making explanation on the contrary, these nouns of locality do not indicate that There must be specific orientation with the device or element for implying meaning or with specific azimuth configuration and operation, therefore cannot manage It solves as the limitation to the application protection domain；The noun of locality " inside and outside " refers to compared with inside and outside each component profile in itself.

For ease of description, spatially relative term can be used herein, as " ... on ", " ... top ", " ... upper surface ", " above " etc., for describing such as a device shown in the figure or feature and other devices or spy The spatial relation of sign.It should be appreciated that spatially relative term is intended to comprising the orientation except device described in figure Outside different azimuth in use or operation.For example, if the device in attached drawing is squeezed, it is described as " in other devices It will be positioned as " under other devices or construction after the device of part or construction top " or " on other devices or construction " Side " or " under other devices or construction ".Thus, exemplary term " ... top " can include " ... top " and " in ... lower section " two kinds of orientation.The device can also other different modes positioning (being rotated by 90 ° or in other orientation), and And respective explanations are made to the opposite description in space used herein above.

Furthermore, it is necessary to explanation, limits parts, it is only for be convenient for using the words such as " first ", " second " Corresponding parts are distinguished, such as without Stated otherwise, above-mentioned word is there is no particular meaning, therefore it is not intended that this Apply for the limitation of protection domain.

The above is only the preferred embodiment of the utility model only, is not intended to limit the utility model, for this For the technical staff in field, various modifications and changes may be made to the present invention.It is all in the spirit and principles of the utility model Within, any modifications, equivalent replacements and improvements are made should be included within the scope of protection of this utility model.

Claims (24)

1. a kind of screw compressor, which is characterized in that including：

Fixed scroll (201) is provided with air entry (201a) and exhaust outlet (201b) on the fixed scroll (201)；

Discharge chambe (11) is formed between orbiter (202), with the fixed scroll (201), is set on the orbiter (202) It is equipped with the backpressure passage for connecting the discharge chambe (11) and back pressure chamber；

Adjusting part is arranged on the fixed scroll (201), and the adjusting part includes being arranged on the backpressure passage and institute The middle pressure adjusting block between back pressure chamber is stated, it is logical that the adjusting connection connected with the back pressure chamber is provided on medium pressure adjusting block Road, medium pressure adjusting block have predetermined motion track so that it is described adjust communicating passage position can change, the back pressure Passage has the communicating position connected with the adjusting communicating passage and the blocking position to stagger with the adjusting communicating passage, The communicating position and the blocking position change with the position of the adjusting communicating passage and are changed.

2. screw compressor according to claim 1, which is characterized in that the adjusting part further includes driving structure, institute Driving structure driving medium pressure adjusting block is stated to move along the predetermined motion track.

3. screw compressor according to claim 2, which is characterized in that there is the fixed scroll (201) middle pressure to adjust Block accommodating chamber (201d), medium pressure adjusting block are rotatably arranged in medium pressure adjusting block accommodating chamber (201d).

4. screw compressor according to claim 3, which is characterized in that medium pressure adjusting block includes bar portion and is arranged on The head of the first end of the bar portion, the adjusting communicating passage are arranged on the head, the head and medium pressure tune There is gap, so that the adjusting communicating passage is connected with the back pressure chamber between the side wall of locking nub accommodating chamber.

5. screw compressor according to claim 4, which is characterized in that the radial dimension on the head is more than the bar portion Radial dimension.

6. screw compressor according to claim 5, which is characterized in that the junction on the bar portion and the head is set There is sealing ring.

7. screw compressor according to claim 4, which is characterized in that it is described adjusting communicating passage include can with it is described The first communicating passage and connection first communicating passage and the second communicating passage of the back pressure chamber of backpressure passage connection, First communicating passage is along the axially extending of the head, the second communicating passage radially extending along the head.

8. screw compressor according to claim 7, which is characterized in that the cross section of first communicating passage includes same The first arc section and the second arc section of heart setting, the first end for being connected to first arc section and second arc section Three-arc section between first end and the second end and the second of second arc section for being connected to first arc section The 4th arc section between end, the three-arc section is tangent with first arc section and second arc section respectively, institute It is tangent with first arc section and second arc section respectively to state the 4th arc section.

9. screw compressor according to claim 8, which is characterized in that the backpressure passage includes introduction hole (202c), When the backpressure passage is in communicating position, projection of the introduction hole (202c) on medium pressure adjusting block is located at described Between first arc section and second arc section.

10. screw compressor according to claim 8, which is characterized in that the adjusting communicating passage further includes connection institute The third connecting passage of the first communicating passage and second communicating passage is stated, the cross section of the third connecting passage is circle Shape, the circle are tangent with first arc section and second arc section.

11. screw compressor according to claim 4, which is characterized in that the fixed scroll (201) has driving structure Accommodating chamber, the driving structure are movably disposed in the driving structure accommodating chamber.

12. screw compressor according to claim 11, which is characterized in that the driving structure accommodating chamber include with it is described The admission pressure chamber and the discharge plenum being connected with the exhaust outlet (201b) that air entry (201a) is connected, the drive Dynamic structure is between the admission pressure chamber and the discharge plenum and in the admission pressure chamber and the pressure at expulsion It is moved under the pressure difference of chamber.

13. screw compressor according to claim 12, which is characterized in that the adjusting part further include be arranged on it is described Elastic component in admission pressure chamber, the elastic component are contacted with the driving structure.

14. screw compressor according to claim 12, which is characterized in that the driving structure and medium pressure adjusting block Perpendicular, the driving structure is can be along the rack (402) moved radially of the fixed scroll, the second end of the bar portion It is provided with and the rack (402) meshed gears (404).

15. screw compressor according to claim 14, which is characterized in that the fixed scroll (201) includes fixed block (405), the driving structure accommodating chamber is arranged in the fixed block (405).

16. screw compressor according to claim 15, which is characterized in that one end of the driving structure accommodating chamber is envelope Closed end, the other end are open end, and limited block (409) is provided at the open end.

17. screw compressor according to claim 12, which is characterized in that the driving structure and the driving structure are held Receive chamber side wall between be provided with sealing ring.

18. screw compressor according to claim 12, which is characterized in that the driving structure and medium pressure adjusting block Coaxial arrangement, the driving structure can be provided with driving rotation along the axial movement of the fixed scroll in the driving structure Turn helicoid (502c), the second end of the bar portion is provided with that rotating screw face (502c) is matched is driven with the driving Rotating screw face (501c).

19. screw compressor according to claim 18, which is characterized in that driving rotating screw face (502c) is risen The first plane is additionally provided between point and terminal, and described be driven in rotation between the beginning and end of helicoid (501c) also sets up Have and matched second plane of first plane.

20. screw compressor according to claim 18, which is characterized in that the fixed scroll (201) includes cover board (508) be movably threaded through in the cover board (508) with guide finger (509), the guide finger (509), and with the driving Structure is fixedly connected.

21. screw compressor according to claim 20, which is characterized in that the guide finger (509) deviates the driving The axis of structure is set.

22. screw compressor according to claim 12, which is characterized in that the company of being provided in the fixed scroll (201) Lead to the air-breathing communicating passage (201c) of the air entry (201a) and the admission pressure chamber.

23. screw compressor according to claim 3, which is characterized in that the driving structure is servomotor (602), The motor shaft of the servomotor (602) can control medium pressure adjusting block to be moved in the predetermined motion track.

24. a kind of air conditioner, including screw compressor, which is characterized in that the screw compressor is to appoint in claim 1 to 23 Screw compressor described in one.