CN107893757B - Scroll compressor, air conditioner and control method of scroll compressor - Google Patents

Abstract

The invention provides a scroll compressor, an air conditioner and a control method of the scroll compressor, wherein the scroll compressor comprises the following components: the device comprises a fixed scroll, an movable scroll and an adjusting assembly arranged on the fixed scroll. The movable vortex plate is provided with a back pressure channel communicated with the compression chamber and the back pressure chamber, and the adjusting component comprises a medium pressure adjusting block arranged between the back pressure channel and the back pressure chamber. The medium pressure regulating block is provided with a regulating communication channel communicated with the back pressure chamber and has a preset moving track to change the position of the regulating communication channel, the back pressure channel is provided with a communication position communicated with the regulating communication channel and a blocking position staggered with the regulating communication channel, and the communication position and the blocking position are changed along with the change of the position of the regulating communication channel. The invention effectively solves the problems that the pressure of the back pressure chamber is excessive or insufficient due to the fact that the pressure of the back pressure chamber cannot be effectively regulated when the operation working condition of the scroll compressor deviates in the prior art, and the efficiency and the reliability of the scroll compressor are possibly affected.

Description

Scroll compressor, air conditioner and control method of scroll compressor

Technical Field

The invention relates to the field of air conditioners, in particular to a scroll compressor, an air conditioner and a control method of the scroll compressor.

Background

Scroll compressors are high efficiency, low noise, and smooth running positive displacement compressors and have found widespread use in air conditioning and refrigeration units in recent years. Generally, a scroll compressor is composed of a hermetic shell, a movable scroll, a fixed scroll, a crankshaft, an anti-rotation mechanism, a motor, and other parts. It relies on a pair of intermeshing orbiting and non-orbiting scroll wraps to form a pair of crescent-shaped closed working chambers. Under the drive of the crankshaft, the movable vortex winds around the center of the fixed vortex disk, and makes rotation-free translation with a fixed radius of gyration, the crescent working chamber continuously moves towards the center, the volume of the crescent working chamber continuously reduces, the pressure of the crescent working chamber continuously increases until the crescent working chamber is communicated with the central exhaust hole, and the high-pressure refrigerant is discharged out of the pump body, so that the suction and compression effects of the refrigerant are realized.

In the working process of the scroll compressor, gas leakage and friction are aggravated because gas force, centrifugal force and the like act on the scroll plate to cause the scroll plate to topple or separate from each other. In the prior art, a floating form of a movable vortex disc or a fixed vortex disc is adopted, and a back pressure chamber is arranged on one side of the movable vortex disc or the fixed vortex disc, which is opposite to a scroll, so that back pressure is generated to balance overturning acting force or moment, and sealing between the movable vortex and the fixed vortex is realized. However, the design of the back pressure is unreasonable, and the performance and reliability of the compressor are directly affected; if the back pressure is excessive, the adhesion acting force between the movable vortex plates is too large, the friction power consumption is increased, even abrasion and adhesion occur, and the performance and reliability are reduced; if the back pressure is insufficient, the movable vortex plate is overturned, the vortex pump body is seriously leaked, the refrigerating capacity is reduced, the power consumption is increased, and the exhaust temperature is higher, so that the performance and the reliability are reduced. Therefore, designing a suitable back pressure is a key technique for achieving high efficiency and high reliability for scroll compressors.

Patent application No. 201210023627.X discloses a back pressure structure of a scroll compressor, but the back pressure channel of the scroll compressor disclosed in the patent directly enters a back pressure chamber through a notch of a fixed scroll, so that proper back pressure cannot be provided. When the actual working condition of the scroll compressor deviates from the design working condition, the condition of overlarge back pressure or insufficient back pressure easily occurs, and the energy efficiency and the reliability of the scroll compressor are directly affected.

Disclosure of Invention

The invention aims to provide a scroll compressor, an air conditioner and a control method of the scroll compressor, which are used for solving the problems that the excessive pressure or the insufficient pressure of a back pressure chamber can be caused by the fact that the pressure of the back pressure chamber can not be effectively regulated when the operation working condition of the scroll compressor deviates in the prior art, and the energy efficiency and the reliability of the scroll compressor can be influenced.

In order to achieve the above object, according to one aspect of the present invention, there is provided a scroll compressor comprising: the fixed scroll is provided with an air suction port and an air exhaust port; a compression chamber is formed between the movable scroll and the fixed scroll, and a back pressure channel which is communicated with the compression chamber and the back pressure chamber is arranged on the movable scroll; the regulating assembly is arranged on the fixed scroll and comprises a medium pressure regulating block arranged between the back pressure channel and the back pressure chamber, the medium pressure regulating block is provided with a regulating communication channel communicated with the back pressure chamber, the medium pressure regulating block is provided with a preset moving track so that the position of the regulating communication channel can be changed, the back pressure channel is provided with a communication position communicated with the regulating communication channel and a blocking position staggered with the regulating communication channel, and the communication position and the blocking position are changed along with the position change of the regulating communication channel.

Further, the adjusting assembly further comprises a driving structure, and the driving structure drives the medium-pressure adjusting block to move along a preset moving track.

Further, the fixed scroll is provided with a medium pressure adjusting block accommodating cavity, and the medium pressure adjusting block is rotatably arranged in the medium pressure adjusting block accommodating cavity.

Further, the medium pressure regulating block includes a stem portion and a head portion provided at a first end of the stem portion, the regulating communication passage is provided on the head portion with a gap between the head portion and a side wall of the medium pressure regulating block accommodating chamber to communicate the regulating communication passage with the back pressure chamber.

Further, the radial dimension of the head portion is greater than the radial dimension of the stem portion.

Further, a sealing ring is arranged at the joint of the rod part and the head part.

Further, the regulation communication passage includes a first communication passage capable of communicating with the back pressure passage, the first communication passage extending in the axial direction of the head portion, and a second communication passage communicating the first communication passage and the back pressure chamber, the second communication passage extending in the radial direction of the head portion.

Further, the cross section of the first communication channel comprises a first arc section and a second arc section which are concentrically arranged, a third arc section connected between the first end of the first arc section and the first end of the second arc section, and a fourth arc section connected between the second end of the first arc section and the second end of the second arc section, wherein the third arc section is tangent with the first arc section and the second arc section respectively, and the fourth arc section is tangent with the first arc section and the second arc section respectively.

Further, the back pressure passage includes an introduction hole, and a projection of the introduction hole on the medium pressure adjusting block is located between the first circular arc section and the second circular arc section when the back pressure passage is in the communication position.

Further, the adjusting communication channel further comprises a third communication channel communicated with the first communication channel and the second communication channel, the cross section of the third communication channel is circular, and the circular shape is tangential to the first circular arc section and the second circular arc section.

Further, the fixed scroll has a drive structure receiving cavity in which the drive structure is movably disposed.

Further, the driving structure accommodating cavity comprises an air inlet pressure cavity communicated with the air suction port and an exhaust pressure cavity communicated with the exhaust port, and the driving structure is positioned between the air inlet pressure cavity and the exhaust pressure cavity and moves under the pressure difference of the air inlet pressure cavity and the exhaust pressure cavity.

Further, the adjusting assembly further comprises an elastic piece arranged in the air inlet pressure cavity, and the elastic piece is in abutting fit with the driving structure.

Further, the driving structure is perpendicular to the medium-pressure adjusting block, the driving structure is a rack capable of moving along the radial direction of the fixed scroll, and a gear meshed with the rack is arranged at the second end of the rod part.

Further, the fixed scroll includes a fixed block in which the driving structure accommodating chamber is provided.

Further, one end of the driving structure accommodating cavity is a closed end, the other end of the driving structure accommodating cavity is an open end, and a limit stop is arranged at the open end.

Further, a sealing ring is arranged between the driving structure and the side wall of the driving structure accommodating cavity.

Further, the drive structure and the medium pressure regulating block are coaxially arranged, the drive structure can move along the axial direction of the fixed scroll, a driving rotary spiral surface is arranged on the drive structure, and a driven rotary spiral surface matched with the driving rotary spiral surface is arranged at the second end of the rod part.

Further, a first plane is further arranged between the starting point and the end point of the driven rotary spiral surface, and a second plane matched with the first plane is further arranged between the starting point and the end point of the driven rotary spiral surface.

Further, the fixed scroll comprises a cover plate and a guide pin, wherein the guide pin is movably arranged in the cover plate in a penetrating manner and is fixedly connected with the driving structure.

Further, the guide pin is disposed offset from the axis of the drive structure.

Further, an air suction communication channel which is communicated with the air suction port and the air inlet pressure cavity is arranged in the fixed vortex plate.

Further, the driving structure is a servo motor, and a motor shaft of the servo motor can control the medium-voltage regulating block to move in a preset moving track.

According to another aspect of the present invention, there is provided an air conditioner including a scroll compressor, which is the above-described scroll compressor.

According to another aspect of the present invention, there is provided a control method of a scroll compressor for controlling the above-mentioned scroll compressor, comprising the steps of: acquiring suction pressure and discharge pressure of the scroll compressor; and adjusting the rotation angle of a motor shaft of a servo motor of the scroll compressor according to the difference value of the suction pressure and the discharge pressure.

By applying the technical scheme of the invention, the medium pressure regulating block of the regulating assembly is movably arranged in the fixed scroll, when the actual working condition of the scroll compressor is inconsistent with the design working condition, the medium pressure regulating block can move the regulating communication channel to the corresponding position in the preset moving track according to the pressure change of the actual working condition or under the control of the system, so that the communication position and the blocking position of the back pressure channel and the regulating communication channel are further limited, the pressure of the refrigerant entering the back pressure chamber is controlled, the control and the regulation of the pressure of the back pressure chamber are realized, and the pressure of the back pressure chamber is maintained in a proper range. The invention can avoid the situation that the movable vortex plate is separated from the fixed vortex plate due to insufficient back pressure, and gas leakage and overturning of the movable vortex plate occur; meanwhile, the excessive adhesion acting force between the movable vortex plate and the fixed vortex plate can be avoided, the friction power consumption is increased, even abrasion and adhesion occur, and further the performance and reliability of the vortex compressor are reduced.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application. In the drawings:

FIG. 1 shows a schematic cross-sectional structural view of an embodiment one of a scroll compressor in accordance with the present application;

FIG. 2 illustrates a schematic view of a partial cross-sectional structure of a non-orbiting scroll of the scroll compressor of FIG. 1;

FIG. 3 illustrates a partial enlarged schematic view of the scroll compressor of FIG. 2 at A;

FIG. 4 illustrates a schematic view of a semi-sectional structure of a non-orbiting scroll of the scroll compressor of FIG. 1;

FIG. 5 illustrates a partially enlarged schematic view of the non-orbiting scroll of FIG. 4 at B;

FIG. 6 illustrates a partially enlarged schematic view of the non-orbiting scroll of FIG. 4 at C;

FIG. 7 illustrates a schematic bottom view of the non-orbiting scroll of FIG. 4;

FIG. 8 illustrates a D-D cross-sectional structural view of the non-orbiting scroll of FIG. 7;

FIG. 9 shows a schematic perspective view of a medium pressure adjustment block in the fixed scroll of FIG. 2;

FIG. 10 is a schematic diagram showing the driving structure of FIG. 2 and the medium pressure adjusting block in a mated state under the working condition 1;

FIG. 11 is a schematic diagram showing the driving structure of FIG. 2 and the medium pressure adjusting block in a mated state under the working condition 2;

Fig. 12 is a schematic diagram showing the running track of the first communication passage and the introduction hole of fig. 2;

FIG. 13 illustrates a schematic diagram of the operation of the adjustment assembly of FIG. 2 during operating condition 1;

FIG. 14 illustrates a schematic diagram of the operation of the adjustment assembly of FIG. 2 during operating condition 2;

FIG. 15 illustrates a schematic diagram of the compression chamber pressure versus crank angle relationship in the adjustment assembly of FIG. 2;

FIG. 16 is a graphical representation of the relationship between work Kuang Yacha and crank angle, spring working length of the adjustment assembly of FIG. 2;

FIG. 17 illustrates a schematic diagram of the operating range versus back pressure margin relationship of the scroll compressor of FIG. 1;

FIG. 18 illustrates a schematic view of the operating range versus back pressure relationship of the scroll compressor of FIG. 1;

FIG. 19 illustrates a schematic view of the operating range versus back pressure relationship of the scroll compressor of FIG. 1;

FIG. 20 shows a schematic cross-sectional structural view of a second embodiment of a scroll compressor in accordance with the present invention;

FIG. 21 illustrates a schematic view of a partial cross-sectional structure of a non-orbiting scroll of the scroll compressor of FIG. 20;

FIG. 22 illustrates a schematic view of a semi-sectional structure of a non-orbiting scroll of the scroll compressor of FIG. 21;

FIG. 23 shows a schematic structural view of the medium voltage regulator block of FIG. 22;

FIG. 24 illustrates a schematic diagram of the operation of the adjustment assembly of FIG. 21 under operating condition 1;

Fig. 25 is a schematic cross-sectional view showing a third embodiment of a scroll compressor according to the present invention;

FIG. 26 illustrates an enlarged partial schematic view of the scroll compressor of FIG. 25;

fig. 27 shows a system schematic diagram of an embodiment of an air conditioner according to the present invention; and

fig. 28 shows a control flow chart of the adjusting assembly of the air conditioner of fig. 27.

Wherein the above figures include the following reference numerals:

1. a scroll compressor; 3. a motor driving part; 4. an adjustment assembly; 10. a suction side region; 11. a compression chamber; 12. an exhaust side region; 13. a medium pressure back pressure chamber; 14. a high pressure backpressure region; 15. an oil storage area; 100. a housing; 101. an air suction pipe; 102. an exhaust pipe; 201. a fixed scroll; 201a, an air suction port; 201b, exhaust port; 201c, an air suction communication channel; 201d, a medium-voltage regulating block accommodating cavity; 201e, medium-pressure communication grooves; 202. an orbiting scroll; 202a, a lead-out hole; 202b, medium pressure communication channels; 202c, introducing holes; 203. an upper bracket; 203a, an upper bracket oil return passage; 204. a crankshaft; 204a, an oil supply channel; 205. a cross slip ring; 206. a lower bracket; 207. a sealing bolt; 208. a seal ring; 209. a drive bearing; 210. a main bearing; 211. a sub-bearing; 212. a thrust bearing; 213. an oil suction pipe; 214. an oil guiding sheet; 215. an oil return sheet metal part; 301. a rotor; 302. a stator; 401. a medium pressure regulating block; 401a, a first communication channel; 401b, a second communication channel; 402. a rack; 403. a spring; 404. a gear; 405. a fixed block; 405a, a drive structure receiving cavity; 406. a seal ring; 407. a seal ring; 408. a seal ring; 409. a limit stop; 410. a fastening bolt; 501. a medium pressure regulating block; 501a, a first communication channel; 501b, a second communication channel; 501c, driven to rotate the helicoid; 502. a driving structure; 502a, guide pin holes; 502b, sealing grooves; 502c, driving a rotary helicoid; 503. a spring; 504. a flat spiral spring; 505. a seal ring; 506. a seal ring; 507. a fastening bolt; 508. a cover plate; 508a, high pressure channels; 509. a guide pin; 601. a medium pressure regulating block; 602. a servo motor; 603. a seal ring; 604. a fastening bolt; 605. binding posts; 701. an outdoor unit; 702. an indoor unit; 703. a throttle valve; 704. a four-way reversing valve; 705. and the monitoring and operation control unit.

Detailed Description

The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the application, its application, or uses. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.

The relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present application unless it is specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective parts shown in the drawings are not drawn in actual scale for convenience of description. Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but should be considered part of the specification where appropriate. In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.

Embodiment one:

as shown in fig. 1, the scroll compressor of the first embodiment includes a fixed scroll 201, an orbiting scroll 202, and an adjusting assembly 4. Wherein, the fixed scroll 201 and the movable scroll 202 are disposed in the housing 100 and rigidly connected in the upper space of the housing 100 by an upper bracket 203. The lower bracket 206 is rigidly connected to the space below the housing 100, the main bearing 210 is provided to the upper bracket 203, and the sub-bearing 211 is provided to the lower bracket 206, both supporting the crankshaft 204 in the radial direction. While a thrust bearing 212 is provided below the lower bracket 206 to support the crankshaft 204 in the axial direction. The motor driving part 3 is arranged between the upper bracket 203 and the lower bracket 206, the stator 302 of which is in interference fit with the housing 100 to achieve a rigid connection, and the rotor 301 of which is also in interference fit with the crankshaft 204 to achieve a rigid connection. The rotor 301 can rotate at a high speed relative to the stator 302, so that the motor driving part 3 controls the crankshaft 204 to rotate, and the movable scroll 202 is driven to perform rotary translation with a certain radius of gyration around the center of the fixed scroll 201.

Specifically, as shown in fig. 1 to 3, the fixed scroll 201 of the present embodiment is rigidly connected to the upper bracket 203 by bolts, and the movable scroll 202 is installed between the upper bracket 203 and the fixed scroll 201. The fixed scroll 201 and the movable scroll 202 are provided with scroll teeth which are relatively eccentric and are oppositely arranged with a phase difference of 180 degrees, so that the mutually meshed movable scroll teeth and the fixed scroll teeth form a plurality of pairs of crescent closed working chambers. As shown in fig. 1, the back surface of the movable scroll 202 is provided with a bearing chamber and is provided with a drive bearing 209 in an interference fit, and the drive bearing 209 is nested with an eccentric portion at the upper end of the crankshaft 204. The movable scroll 202 is coupled to the upper bracket 203 via a cross slip ring 205, and the cross slip ring 205 can prevent the movable scroll 202 from rotating. The above structure enables the orbiting scroll 202 to perform an orbiting translation about the center of the fixed scroll 201 by the drive of the crankshaft 204.

In the above-mentioned rotary translation process, the crescent working chamber may form a suction chamber and a compression chamber according to the difference of the relative motion states between the fixed scroll 201 and the movable scroll 202, and the gas pressure in the working chamber is gradually increased. The fixed scroll 201 is provided with an intake port 201a and an exhaust port 201b, and a compression chamber 11 is formed between the movable scroll 202 and the fixed scroll 201. The compressed high-pressure refrigerant is discharged from the discharge port 201b to the discharge side region 12, thereby achieving suction and compression of the refrigerant. The movable scroll 202 is provided with a back pressure channel for communicating the compression chamber 11 and the back pressure chamber, the regulating assembly 4 is arranged on the fixed scroll 201, the regulating assembly 4 comprises a medium pressure regulating block 401 arranged between the back pressure channel and the back pressure chamber, the medium pressure regulating block 401 is provided with a regulating communication channel communicated with the back pressure chamber, the medium pressure regulating block 401 has a preset moving track so that the position of the regulating communication channel can be changed, the back pressure channel has a communication position communicated with the regulating communication channel and a blocking position staggered with the regulating communication channel, and the communication position and the blocking position are changed along with the change of the position of the regulating communication channel of the medium pressure communication channel.

By applying the technical scheme of the embodiment, the medium pressure adjusting block 401 of the adjusting component 4 is movably arranged in the fixed scroll 201, when the actual working condition and the design working condition of the scroll compressor are different, the medium pressure adjusting block 401 can move the adjusting communication channel to the corresponding position in the preset moving track according to the pressure change of the actual working condition or under the control of the system, so as to limit the communication position and the blocking position of the back pressure channel and the adjusting communication channel, thereby controlling the pressure of the refrigerant entering the back pressure chamber, realizing the control and adjustment of the pressure of the back pressure chamber and keeping the pressure of the back pressure chamber in a proper range. The invention can avoid the situations that the movable vortex plate 202 is separated from the fixed vortex plate 201 due to insufficient back pressure, gas leakage occurs, and the movable vortex plate 202 overturns; meanwhile, the excessive adhesion acting force between the movable vortex plate and the fixed vortex plate can be avoided, the friction power consumption is increased, even abrasion and adhesion occur, and further the performance and reliability of the vortex compressor are reduced.

For ease of processing, as shown in fig. 1, 4 and 6, the back pressure passage of the present embodiment includes an outlet hole 202a, a medium pressure communication passage 202b and an inlet hole 202c. Wherein, draw-out hole 202a and draw-in hole 202c are set along the axial direction of movable scroll 202, medium pressure communication channel 202b is set along the radial direction of movable scroll 202 and communicates draw-out hole 202a and draw-in hole 202c, and one end of medium pressure communication channel 202b near the edge of movable scroll 202 is provided with sealing structure. The preferred sealing structure is a sealing bolt 207.

Further, as shown in fig. 2 to 6, the regulating assembly 4 of the present embodiment further includes a driving structure capable of driving the medium pressure regulating block 401 to move along a predetermined moving trajectory so as to selectively communicate the compression chamber 11 with the back pressure chamber. The driving structure can detect the actual working condition of the scroll compressor, and then the communication range of the compression chamber 11 and the back pressure chamber is controlled through the medium pressure adjusting block 401, so that the size of the gas pressure of the back pressure chamber is adjusted, the pressure of the back pressure chamber is kept in an ideal range, the overlarge or insufficient back pressure is avoided, and the efficiency and the reliability of the scroll compressor are affected.

As shown in fig. 6, 7 and 12, the fixed scroll 201 of the present embodiment is further provided with a medium pressure communication groove 201e, so that the refrigerant flowing out of the second communication passage 401b can flow from the medium pressure communication groove 201e to the back pressure chamber.

Specifically, as shown in fig. 8, a medium pressure adjusting block 401 of the present embodiment is pivotably provided in a medium pressure adjusting block accommodation chamber 201d of a fixed scroll 201, the medium pressure adjusting block 401 includes a rod portion and a head portion provided at a first end of the rod portion, an adjusting communication passage is provided on the head portion, and a gap is provided between the head portion and a side wall of the medium pressure adjusting block accommodation chamber 201d so that the adjusting communication passage is always communicated with a back pressure chamber.

Similarly to the back pressure passage, as shown in fig. 6, the adjustment communication passage of the present embodiment includes a first communication passage 401a provided in the axial direction of the head portion, a second communication passage 401b provided in the radial direction of the head portion, and a third communication passage that communicates the first communication passage 401a and the second communication passage 401 b. The gas flowing out from the introducing hole 202c can enter the back pressure chamber through the gap between the movable scroll 202 and the upper bracket 203 through the first communicating channel 401a and the second communicating channel 401b, so that the back pressure in an ideal range is provided, the movable scroll 202 can keep contact with the fixed scroll 201, the tightness of the compression chamber 11 is ensured, the movable scroll 202 is prevented from being separated from the fixed scroll 201, and the gas leakage and the overturning of the movable scroll 202 occur; and the excessive adhesion acting force between the movable vortex plate and the fixed vortex plate can be avoided, the friction power consumption is increased, even abrasion and adhesion occur, and further the performance and reliability of the vortex compressor are reduced.

Specifically, as shown in fig. 12, the cross section of the first communication channel 401a includes four arc segments, where the first arc segment and the second arc segment are concentrically disposed, the third arc segment is connected between the first end of the first arc segment and the first end of the second arc segment, and the fourth arc segment is connected between the second end of the first arc segment and the second end of the second arc segment. The third arc section is tangent to the first arc section and the second arc section respectively, and the fourth arc section is tangent to the first arc section and the second arc section respectively. The above-described structure makes the first communication passage 401a have a range overlapping with the introduction hole 202 c.

As shown in fig. 6 and 12 to 14, the orbiting scroll 202 is driven by the crankshaft 204 to perform an orbiting translational motion, and the orbit of the orbiting translational motion is circular. The introduction hole 202c of the back pressure passage may then generate the same circular track along with the orbiting translation of the orbiting scroll 202, and the first communication passage 401a may cover a predetermined length along the predetermined track. When the introduction hole 202c coincides with the first communication passage 401a, the back pressure passage communicates with the regulation communication passage, and thus communicates with the back pressure chamber, into which gas can enter from the compression chamber 11; when the introduction hole 202c is completely offset from the first communication passage 401a, the back pressure passage is disconnected from the communication passage, and the gas cannot flow out of the compression chamber 11. In each cycle of the orbiting translation of the orbiting scroll, the first communication passage 401a is intermittently communicated with the introduction hole 202c, and the crank angle position corresponding to the on or off position thereof depends on the rotation angle of the medium pressure adjusting block 401.

Specifically, as shown in fig. 12, O is a movement track of the introduction hole 202c with respect to the medium pressure adjustment block 401, the introduction hole 202c rotates counterclockwise with respect to the axis of the medium pressure adjustment block 401, and when the introduction hole 202c is located at the P1 position, the working chamber completes the suction process, and the working chamber is closed to form the compression chamber. When the introduction hole 202c moves from the P1 position to the P2 position, the introduction hole 202c is displaced from the first communication passage 401a, the back pressure passage is disconnected from the adjustment communication passage, the gas is compressed in the compression chamber 11, and the gas pressure increases. When the introduction hole 202c moves from the P2 to the P3 position, the introduction hole 202c has a coincident portion with the first communication passage 401a, the back pressure passage communicates with the regulation communication passage, and gas flows from the compression chamber 11 to the back pressure chamber to provide a back pressure.

Since the pressure of the gas introduced into the hole 202c is different when the movable scroll 202 moves to the different positions of the trajectory, and thus the pressure of the gas flowing into the back pressure chamber is also different when the first communication passage 401a is located at the different positions of the movement trajectory, the purpose of adjusting the back pressure of the back pressure chamber is achieved. The track range when the compression chamber 11 communicates with the back pressure chamber depends on the magnitude of the arc of the first communication passage 401 a.

Specifically, as shown in fig. 1, the back pressure chamber of the scroll compressor of the present embodiment includes a medium pressure back pressure chamber 13 and a high pressure back pressure region 14, wherein the high pressure back pressure region 14 is a chamber in which the upper bracket 203 is formed to avoid rotation of the crankshaft 204, and the medium pressure back pressure chamber 13 is formed at other positions between the upper bracket 203 and the movable scroll 202. The middle pressure back pressure chamber 13 and the high pressure back pressure region 14 are sealed by a seal ring 208, and the back pressure channel communicates the compression chamber 11 and the middle pressure back pressure chamber 13.

As shown in fig. 1, an oil storage area 15 is provided below the inside of the casing 100 of the present embodiment, and an oil guide plate 214 and an oil suction pipe 213 are mounted at the lower end of the crankshaft 204, an oil supply passage 204a is provided in the crankshaft 204, and an upper bracket oil return passage 203a is provided in the upper bracket 203, thereby forming an oil supply circulation path. The seal 208 is provided with a slit to allow the refrigerant oil in the high-pressure back pressure region 14 to enter the medium-pressure back pressure chamber 13, to lubricate and cool the friction pair in the medium-pressure back pressure chamber 13, and the like.

The crankshaft 204 rotates at a high speed to drive the orbiting scroll 202 to orbit and translate, and the working chamber generates suction and compression actions. Meanwhile, due to the pumping action of the oil guide plate 214, the frozen oil in the oil storage area 15 is delivered to the upper end area of the crankshaft 204 through the oil supply passage 204a, and enters the high-pressure back pressure area 14 through a gap or a trimming passage between the drive bearing 209 and the crankshaft 204. At this time, most of the frozen oil flows back to the oil reservoir 15 through the upper bracket oil return passage 203a and the oil return sheet metal member 215. And a small part of the refrigerating oil enters the medium-pressure back pressure chamber 13 through the notch of the sealing ring 208, cools and lubricates each friction pair, and enters the compression chamber 11 through the joint surface between the movable scroll 202 and the fixed scroll 201 or the back pressure channel between the medium-pressure back pressure chamber 13 and the compression chamber 11, so as to lubricate, cool and seal the friction pair between the scroll teeth. Simultaneously with the oil supply cycle, the refrigerant enters the suction side region 10 of the scroll compressor from the suction pipe 101 connected to the outlet of the system evaporator, and enters the working chamber formed by the scroll 202 and the fixed scroll 201 being engaged in the wrap, which is the suction chamber. With the continuous driving of the crankshaft 204, the suction chamber is closed and starts to compress into the compression chamber 11, and the gas in the compression chamber 11 continues to be compressed to a certain pressure, and enters the discharge side area 12 through the discharge port 201b or a pressure relief hole (not shown) of the fixed scroll 201, so that the refrigerant flows through the space where the motor driving part 3 is located and cools the motor driving part 3, and then is discharged from the discharge pipe 102 to the condenser of the air conditioning system.

When the thrust generated by the medium-pressure back pressure chamber 13 is Fb1 and the thrust generated by the high-pressure back pressure region 14 is Fb2, the thrust fb=fb1+fb2 generated by the back pressure chamber. This back pressure is used to balance the overturning force or moment of the orbiting scroll 202, and to seal between the orbiting scroll 202 and the fixed scroll 201.

Further, as shown in fig. 4 and 5, the driving structure of the present embodiment is movably provided in a driving structure accommodating chamber 405a of the fixed scroll 201, and the driving structure accommodating chamber 405a includes an intake pressure chamber communicating with the intake port 201a and an exhaust pressure chamber communicating with the exhaust port 201 b. When the actual working conditions deviate from the design working conditions due to the change of the air inlet pressure Ps and the air outlet pressure Pd of the vortex compressor, the driving structure moves under the action of the pressure difference of the air inlet pressure cavity and the air outlet pressure cavity at two sides, so that the medium pressure regulating block 401 is controlled to rotate, and the purpose of regulating the back pressure of the back pressure chamber is achieved.

Specifically, as shown in fig. 3, the driving structure of the embodiment is perpendicular to the medium pressure adjusting block 401, a rack 402 is disposed on the driving structure, a gear 404 matched with the rack 402 is disposed at the second end of the rod portion of the medium pressure adjusting block 401, and the gear 404 is in interference fit with the rod portion to realize synchronous rotation. When the driving structure moves left and right, the medium-voltage adjusting block 401 can correspondingly rotate clockwise or anticlockwise under the action of the rack 402 and the gear 404, and then the position of the first communication channel 401a on the movement track is adjusted.

Further, as shown in fig. 1 and 2, the fixed scroll 201 of the present embodiment includes a fixed block 405, a driving structure accommodating chamber 405a is provided in the fixed block 405, and a limit stopper 409 is provided in the fixed block 405. The adjusting assembly 4 further comprises an elastic member arranged in the air inlet pressure cavity, and the elastic member is abutted with the driving structure. The elastic member is preferably a spring 403, a first end of the spring 403 is fixed on the fixed block 405, and a second end of the spring 403 abuts against the driving structure. The resultant force of the intake pressure F1 and the spring force Fk received by the driving structure is equal to the exhaust pressure F2, so that the driving structure can move with the change of the pressure difference between the intake pressure chamber and the exhaust pressure chamber. The intake pressure f1=the active area s1×the intake pressure Ps, the exhaust pressure f2=the active area s2×the exhaust pressure Pd, the spring force fk=the spring coefficient k× (the original spring length L0-the present spring length L1), and the parameters are reasonably designed according to the structural requirement so that fk=k× (L0-L1) =f1-f2=s× (Pd-Ps). At this time, under the condition of different working condition pressure differences (Pd-Ps), the driving structure can reciprocate to different positions, that is, under the condition of different working condition pressure differences (Pd-Ps), each position of the driving structure can be determined to correspond to each working condition pressure difference one by one. Further, the rack 402 and the gear 404 are engaged with each other to rotate the medium pressure adjusting block 401 to a position corresponding to the operating pressure difference (pd—ps). In short, the position of the first communication passage 401a may be adjusted according to the operating condition differential pressure (Pd-Ps), so that the crank angle position corresponding to the connection or disconnection of the medium pressure back pressure chamber 13 and the compression chamber 11 is adjusted, and thus it is realized that the corresponding crank angle when the medium pressure back pressure chamber 13 is connected with the compression chamber 11 may be adaptively adjusted or controlled according to the operating condition.

Specifically, as shown in fig. 13 and 17, the scroll compressor is operated under an actual condition 1 where the discharge pressure is much larger than the suction pressure, resulting in a large pressure difference, and this actual condition 1 is in the back pressure excess region. As shown in fig. 13 (1), the orbiting scroll 202 is rotated counterclockwise with respect to the fixed scroll 201 with the crank angle θ0 corresponding to the intake closing of the inner compression chamber defined as zero, and at this time, the extraction hole 202a of the orbiting scroll 202 communicates with the inner compression chamber 11; as shown in (2), when the crank shaft 204 is turned at θ1-1 after the intake of the inner compression chamber 11 is closed, the first communication passage 401a and the introduction hole 202c start to communicate, that is, the intermediate-pressure back pressure chamber 13 and the compression chamber 11 communicate with each other; as shown in (3), when the rotation angle θ1-2 of the crankshaft 204 is between θ1-1 and θ1-3, the refrigerant of the corresponding pressure can enter the medium-pressure back pressure chamber 13 from the back pressure passage and the communication passage; as shown in (4), when the crankshaft 204 rotates to the rotation angle θ1-3, the first communication passage 401a is completely disconnected from the introduction hole 202c, that is, the intermediate-pressure back pressure chamber 13 is not communicated with the compression chamber 11.

As shown in fig. 10, in this embodiment, the exhaust pressure F2 reached by the hand of the driving structure is greater than the resultant force of the suction pressure F1 and the spring force Fk, the driving structure moves leftward to balance the force, the medium pressure adjusting block 401 rotates under the driving of the rack 402, the first communication passage 401a rotates to the position in fig. 13, and the medium pressure back pressure chamber 13 starts to communicate at a position at which the crank angle is relatively forward. As shown in fig. 15, in the working condition 1, the compression chamber pressure-crank angle curve is shown, and in the working condition, the middle pressure back pressure chamber 13 is communicated with the compression chamber 11 at a position between the front crank angles theta 1-1 and theta 1-3 to obtain a relatively smaller middle pressure back pressure Pmid1 value, so as to obtain a smaller middle pressure back pressure compared with the prior art, solve the problem of excessive back pressure in the working condition of the back pressure excess region, provide proper back pressure for the movable scroll 202 to meet the requirements of tightness and smooth running of the scroll pump body, avoid the excessive adhesion acting force between the movable scroll and the fixed scroll, increase friction power consumption and even wear and adhesion, and improve the performance and reliability of the compressor in the running region.

In another case, as shown in fig. 14 and 17, the scroll compressor is operated under an actual condition 2 where the discharge pressure is much smaller than the suction pressure, resulting in a small pressure difference, and the actual condition 2 is in a region where the back pressure is insufficient. As shown in fig. 14 (1), the movable scroll 202 rotates counterclockwise with respect to the fixed scroll 201, and at this time, the extraction hole 202a of the movable scroll 202 communicates with the inner compression chamber 11, with the crank angle θ0 corresponding to the closing of the suction of the inner compression chamber being defined as zero position; as shown in (2), when the crank shaft 204 is turned at θ2-1 after the intake of the inner compression chamber 11 is closed, the first communication passage 401a and the introduction hole 202c start to communicate, that is, the intermediate-pressure back pressure chamber 13 and the compression chamber 11 communicate with each other; as shown in (3), when the rotation angle θ2-2 of the crankshaft 204 is between θ2-1 to θ2-3, the refrigerant of the corresponding pressure can enter the medium-pressure back pressure chamber 13 from the back pressure passage and the communication passage; as shown in (4), when the crankshaft 204 rotates to the rotation angle θ2-3, the first communication passage 401a is completely disconnected from the introduction hole 202c, that is, the intermediate-pressure back pressure chamber 13 is not communicated with the compression chamber 11.

As shown in fig. 11, in this embodiment, the exhaust pressure F2 reached by the hand of the driving structure is smaller than the resultant force of the suction pressure F1 and the spring force Fk, the driving structure moves rightward to balance the force, the medium pressure adjusting block 401 rotates under the driving of the rack 402, and the first communication passage 401a rotates to the position in fig. 14, so that the medium pressure back pressure chamber 13 starts to communicate at a position where the crank angle is relatively rear. As shown in fig. 15, in the working condition 2, the compression chamber pressure-crank angle curve is shown, and in the working condition, the middle pressure back pressure chamber 13 is communicated with the compression chamber 11 at a position between the later crank angles theta 2-1 and theta 2-3 to obtain a relatively larger middle pressure back pressure Pmid2 value, so that a larger middle pressure back pressure is obtained compared with the prior art, the problem that the back pressure is insufficient in working condition operation in the area of insufficient back pressure is solved, the proper back pressure is provided for the movable scroll 202 to meet the requirements of tightness and stable operation of the scroll pump body, the problems that the movable scroll is overturned, the scroll pump body is seriously leaked, the refrigerating capacity is reduced, the power consumption is increased, the exhaust temperature is higher and the like are avoided, and the performance and the reliability of the compressor in the operation area can be remarkably improved.

As shown in fig. 16, the adjustment of the crank angle position at which the adjustment assembly 4 in the scroll compressor of the present invention starts and ends communicating the intermediate-pressure back-pressure chamber 13 with the compression chamber 11 belongs to continuous stepless adjustment. In the prior art, the starting and ending crank angle positions of the communication range of the pressure chamber and the compression chamber are fixed, and cannot be adjusted according to the change of working conditions. The adjusting component 4 of the scroll compressor can continuously and steplessly adjust the crank angle position of the medium-pressure back pressure chamber 13 and the compression chamber 11 to start or finish communication according to working conditions, so as to provide different and proper back pressure thrust for the movable scroll 202 according to the working conditions. Therefore, the corresponding crank angle when the medium-pressure back pressure chamber is communicated with the compression chamber can be adaptively adjusted or controlled according to the operation working condition.

As shown in fig. 18, the adjustment effect of the scroll compressor of the present invention is represented on the operation range diagram as: the working conditions on the isobaric differential lines of each different differential pressure provide the crank angle positions at which the different intermediate-pressure back-pressure chambers 13 start to communicate with the compression chamber 11 or at which the communication ends, so as to optimally design the appropriate back-pressure and regulating assembly 4. As shown in fig. 19, compared with the prior art, the vortex compressor of the invention can ensure that the back pressure coefficient (Mt/Mb) is proper under the differential pressure condition of different working conditions, so that the invention can realize that the proper back pressure thrust is provided for all the running areas, namely, the tightness between the movable vortex plate and the fixed vortex plate is ensured; meanwhile, the sticking acting force between the movable vortex plate and the fixed vortex plate under each working condition is optimized, and the friction power consumption is reduced, so that the performance and the reliability of the compressor are improved. On the other hand, the back pressure coefficient (Mt/Mb) curve slope of the scroll compressor is small and more gentle, and the communication angle between the medium pressure back pressure chamber and the compression chamber can be adaptively adjusted. Therefore, when the back pressure structure is designed, the range of the crank angle for communicating the middle pressure back pressure chamber with the compression chamber is larger without considering all limit working conditions. In other words, by adopting the back pressure structure, the crank angle range of the medium pressure back pressure chamber communicated with the compression chamber can be reduced, so that the pressure fluctuation in the medium pressure back pressure chamber can be reduced, the back pressure is more stable, the movable scroll is enabled to rotate more stably, the friction and abrasion of the joint surfaces of the movable scroll and the fixed scroll are reduced, and the vibration and noise generated by unstable operation of the movable scroll are reduced.

Further, as shown in fig. 2 to 6, a sealing ring 406 is provided between the medium pressure adjusting block 401 and the fixed scroll 201 to isolate the medium pressure back pressure chamber 13 from the medium pressure adjusting block accommodating chamber 201d, a sealing ring 407 is provided on the fixed block 405 to seal the medium pressure adjusting block accommodating chamber 201d from the intake pressure chamber, and a sealing ring 408 is provided between the driving structure and the fixed block 405 to isolate the exhaust pressure chamber from the intake pressure chamber. The fixing block 405 is fixed by a fastening bolt 410, and a limit stopper 409 prevents the driving structure from coming out of the driving structure accommodating chamber 405a, and the limit stopper 409 is provided with a through hole to communicate with the exhaust side region 12. In addition, the fixed scroll 201 is provided with an intake communication passage 201c so that the intake pressure chamber and the intake side region are equalized in pressure.

Embodiment two:

compared with the first embodiment, the adjusting assembly of the second embodiment adopts different matching modes to replace the transmission structure of the rack and the pinion in the first embodiment, and the adjusting effect is also realized. As shown in fig. 20 to 24, in the second embodiment, a driving structure 502 is coaxially disposed with a medium pressure adjusting block 501, a driving rotary screw surface 502c is disposed on the driving structure 502, and a driven rotary screw surface 501c matched with the driving rotary screw surface 502c is disposed at a second end of a rod portion of the medium pressure adjusting block 501.

In a similar way to the embodiment, as shown in fig. 23, a first communication channel 501a and a second communication channel 501b are also formed in the medium pressure adjusting block 501 in this embodiment, and a guide pin hole 502a and a seal groove 502b are formed in the driving structure 502. As shown in fig. 24, the driven rotary spiral surface 501c of the medium pressure adjusting block 501 and the driving rotary spiral surface 502c of the driving structure 502 are spiral curved surfaces engaged with each other, and the medium pressure adjusting block 501 is installed in the medium pressure adjusting block accommodation chamber 201d of the fixed scroll 201. The elastic member of this embodiment is a spring 503 and a flat spiral spring 504, one end of the flat spiral spring 504 is fixed to the intermediate pressure adjusting block 501, and the other end is fixed to the fixed scroll 201 and preloaded, so that the flat spiral spring 504 is wound, and the intermediate pressure adjusting block 501 can rotate to one side until the driven rotation spiral surface 501c and the driving rotation spiral surface 502c are closely attached to each other. On the other hand, one end of the spring 503 acts on the fixed scroll 201, and the other end acts on the driving structure 502, so that the driving structure 502 can be reset.

As shown in fig. 24, the driving structure 502 of the present embodiment can move up and down when the pressure difference changes, and further the driving rotation spiral surface 502c and the driven rotation spiral surface 501c drive the medium pressure adjusting block 501 to rotate, so as to change the position of the first communication channel 501a, thereby achieving the purpose of adjusting the back pressure. The specific adjusting effect and principle of this embodiment are similar to those of the first embodiment, and will not be described here again.

Further, as shown in fig. 21, 22 and 24, the fixed scroll 201 of the present embodiment further includes a cover plate 508 and a guide pin 509, where the cover plate 508 is rigidly connected by a fastening bolt 507 and plays a limiting role on the reciprocating motion of the driving structure 502 so as to prevent the driving structure 502 from being separated from the fixed scroll 201, and the guide pin 509 is freely slidably inserted into the cover plate 508 and is in interference fit with the guide pin hole 502a of the driving structure 502 so as to prevent the driving structure 502 from rotating. In order to place the upper end of the driving structure 502 at the exhaust pressure, a high pressure channel 508a is formed in the cover plate 508, and a sealing ring 506 is disposed on the driving structure 502. In order to make the lower end of the driving structure 502 at suction pressure, a suction communication channel 201c is opened on the fixed scroll 201, and a sealing ring 505 is provided to isolate the medium pressure back pressure chamber 13.

Specifically, as shown in fig. 22, the guide pin 509 of the present embodiment is a cylindrical pin and is disposed offset from the axis of the driving structure 502. Since the guide pin 509 is eccentrically disposed, the driving structure 502 can reciprocate only in the up-down direction and cannot rotate. In other embodiments, the guide pin 509 may be a rectangular parallelepiped pin to achieve a rotation stopping effect.

Embodiment III:

compared with the implementation manners of the first embodiment and the second embodiment, the adjusting component of the third embodiment adopts an electric control driving structure, and further controls the medium pressure adjusting block 601 to adjust the back pressure. Specifically, as shown in fig. 25 and 26, the driving structure of the present embodiment is a servo motor 602, and the structure of the medium voltage adjusting block 601 may be the same as that of the first embodiment. The servo motor 602 calculates the angle required by the medium pressure adjusting block 601 according to a preset calculation program and by combining the actually monitored parameters such as the suction pressure, the exhaust pressure and the like, so that the back pressure is more accurately adjusted. The specific adjusting effect and principle of this embodiment are similar to those of the first embodiment, and will not be described here again.

The servo motor 602 is fixed by a fastening bolt 604, and a power supply lead and a signal lead of the servo motor 602 are connected to a terminal 605 of a lead-out wire of the driving motor. In order to isolate the exhaust-side region 12 from the intermediate-pressure back pressure chamber 13, a seal 603 is provided on the intermediate-pressure regulating block 601.

The application also provides an air conditioner, which comprises a scroll compressor, wherein the scroll compressor is provided with the technical characteristics in the embodiment. The air conditioner of the embodiment has the advantages of stable back pressure chamber pressure and high efficiency and reliability of the scroll compressor.

Taking the scroll compressor of the third embodiment as an example, as shown in fig. 27, the air conditioner includes a scroll compressor 1, an outdoor unit 701, an indoor unit 702, a throttle 703, a four-way reversing valve 704, and a monitoring and operation control unit 705. The monitoring and operation control unit 705 may monitor the suction and exhaust pressure of the compressor and feed back to the monitoring and operation control unit 705, where the monitoring and operation control unit 705 is connected to the terminal 605, and may operate according to a preset program according to working conditions such as suction and exhaust pressure, and send signals and instructions to the driving servo motor 602, so as to drive the medium pressure adjusting block 601 to rotate to a specified position, and further adjust the corresponding crank angle position when the medium pressure back pressure chamber 13 is connected or disconnected with the compression chamber 11, so that the corresponding crank angle when the medium pressure back pressure chamber is connected with the compression chamber may be adaptively adjusted or controlled according to the operation working conditions.

As for the scroll compressor of the third embodiment, the present application also provides a control method of the compressor, as shown in fig. 28, the monitoring and arithmetic control unit 705 first monitors and obtains the suction pressure Ps and the discharge pressure Pd. Then according to the monitoring, ps, pd and the compressor design parameter K, the overturning moment Mt (Ps, pd, K) can be calculated, and according to Ps, pd, mt and the compressor design parameter K, the pressure value Pmid required by the medium pressure back pressure chamber can be calculated. Finally, according to Pmid, ps, and the compressor design parameter K, a crank angle θ1 required for initial communication of the regulating assembly when the medium-pressure back pressure chamber obtains Pmid pressure is calculated, and the control unit sends an instruction to control the servo motor 602 to rotate so that the medium-pressure regulating block of the regulating assembly rotates to a specified position with the angle θ1.

In this embodiment, the adjustment assembly is driven by the servo motor 602, and the required back pressure and the initial crank angle position at which the intermediate pressure back pressure chamber is communicated with the compression chamber can be calculated according to the relationship between the structural parameters of the compressor and a preset function or formula by monitoring the compressor Kuang Canshu (suction pressure Ps and discharge pressure Pd), and a command is sent to enable the servo motor to drive the intermediate pressure adjustment block to rotate to the position, so that the self-adaptive adjustment of the back pressure is realized. Therefore, the scheme can adjust the medium-pressure mechanism according to the pressure difference and the pressure ratio or according to a preset calculation program, and further improves the self-adaptive adjustment capability of the back pressure.

From the above description, it can be seen that the above embodiments of the present application achieve the following technical effects:

the medium pressure regulating block of the regulating assembly is movably arranged in the fixed scroll, when the actual working condition and the design working condition of the scroll compressor are different, the medium pressure regulating block can move to the corresponding position in the preset moving track according to the pressure change of the actual working condition or under the control of a system, so that the communicating position and the blocking position of the back pressure channel and the regulating communicating channel are further limited, the pressure of the refrigerant entering the back pressure chamber is controlled, the control and the regulation of the pressure of the back pressure chamber are realized, and the pressure of the back pressure chamber is maintained in a proper range. The application can avoid the situation that the movable vortex plate is separated from the fixed vortex plate due to insufficient back pressure, and gas leakage and overturning of the movable vortex plate occur; meanwhile, the excessive adhesion acting force between the movable vortex plate and the fixed vortex plate can be avoided, the friction power consumption is increased, even abrasion and adhesion occur, and further the performance and reliability of the vortex compressor are reduced.

In the description of the present application, it should be understood that the azimuth or positional relationships indicated by the azimuth terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal", and "top, bottom", etc., are generally based on the azimuth or positional relationships shown in the drawings, merely to facilitate description of the present application and simplify the description, and these azimuth terms do not indicate and imply that the apparatus or elements referred to must have a specific azimuth or be constructed and operated in a specific azimuth, and thus should not be construed as limiting the scope of protection of the present application; the orientation word "inner and outer" refers to inner and outer relative to the contour of the respective component itself.

Spatially relative terms, such as "above … …," "above … …," "upper surface at … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial location relative to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or structures would then be oriented "below" or "beneath" the other devices or structures. Thus, the exemplary term "above … …" may include both orientations of "above … …" and "below … …". The device may also be positioned in other different ways (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

In addition, the terms "first", "second", etc. are used to define the components, and are only for convenience of distinguishing the corresponding components, and the terms have no special meaning unless otherwise stated, and therefore should not be construed as limiting the scope of the present application.

The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (22)

1. A scroll compressor, comprising:

a fixed scroll (201), wherein an air inlet (201 a) and an air outlet (201 b) are arranged on the fixed scroll (201);

a compression chamber (11) is formed between the movable scroll (202) and the fixed scroll (201), and a back pressure channel which is communicated with the compression chamber (11) and the back pressure chamber is arranged on the movable scroll (202);

the adjusting assembly is arranged on the fixed scroll (201), the adjusting assembly comprises a medium pressure adjusting block arranged between the back pressure channel and the back pressure chamber, the medium pressure adjusting block is provided with an adjusting communication channel communicated with the back pressure chamber, the medium pressure adjusting block is provided with a preset moving track so that the position of the adjusting communication channel can be changed, the back pressure channel is provided with a communication position communicated with the adjusting communication channel and a blocking position staggered with the adjusting communication channel, the communication position and the blocking position are changed along with the change of the position of the adjusting communication channel, the medium pressure adjusting block can move according to the pressure change of an actual working condition or under the control of a system, and the adjusting communication channel can move to a corresponding position in the preset moving track so that the back pressure channel and the adjusting communication channel can be switched between the communication position and the blocking position;

The adjusting assembly further comprises a driving structure, and the driving structure drives the medium-voltage adjusting block to move along the preset moving track;

the fixed scroll (201) is provided with a medium pressure adjusting block accommodating cavity (201 d), and the medium pressure adjusting block is rotatably arranged in the medium pressure adjusting block accommodating cavity (201 d);

the medium pressure regulating block comprises a rod part and a head part arranged at the first end of the rod part, the regulating communication channel is arranged on the head part, and a gap is reserved between the head part and the side wall of the medium pressure regulating block accommodating cavity so that the regulating communication channel is communicated with the back pressure chamber.

2. The scroll compressor of claim 1, wherein a radial dimension of the head portion is greater than a radial dimension of the stem portion.

3. The scroll compressor of claim 2, wherein a seal ring is provided at a junction of the stem portion and the head portion.

4. The scroll compressor of claim 1, wherein the regulation communication passage includes a first communication passage capable of communicating with the back pressure passage, the first communication passage extending in an axial direction of the head portion, and a second communication passage communicating the first communication passage and the back pressure chamber, the second communication passage extending in a radial direction of the head portion.

5. The scroll compressor of claim 4, wherein the cross section of the first communication channel includes first and second concentrically disposed arc segments, a third arc segment connected between the first end of the first arc segment and the first end of the second arc segment, and a fourth arc segment connected between the second end of the first arc segment and the second end of the second arc segment, the third arc segment being tangent to the first and second arc segments, respectively, and the fourth arc segment being tangent to the first and second arc segments, respectively.

6. The scroll compressor of claim 5, wherein the back pressure passage includes an introduction hole (202 c), a projection of the introduction hole (202 c) on the medium pressure adjustment block being located between the first arc segment and the second arc segment when the back pressure passage is in the communication position.

7. The scroll compressor of claim 5, wherein the modulated communication passage further comprises a third communication passage that communicates with the first and second communication passages, the third communication passage having a circular cross-section that is tangential to the first and second arc segments.

8. The scroll compressor of claim 1, wherein the non-orbiting scroll (201) has a drive structure receiving cavity, the drive structure being movably disposed within the drive structure receiving cavity.

9. The scroll compressor of claim 8, wherein the drive structure receiving chamber includes an intake pressure chamber in communication with the intake port (201 a) and a discharge pressure chamber in communication with the discharge port (201 b), the drive structure being located between and moving under a pressure differential of the intake pressure chamber and the discharge pressure chamber.

10. The scroll compressor of claim 9, wherein the adjustment assembly further comprises a resilient member disposed in the intake pressure chamber, the resilient member being in abutting engagement with the drive structure.

11. The scroll compressor of claim 9, wherein the drive structure is perpendicular to the medium pressure adjustment block, the drive structure is a rack (402) movable in a radial direction of the fixed scroll, and a second end of the rod portion is provided with a gear (404) engaged with the rack (402).

12. The scroll compressor of claim 11, wherein the non-orbiting scroll (201) includes a fixed block (405), the drive structure receiving cavity being disposed in the fixed block (405).

13. The scroll compressor of claim 12, wherein one end of the drive structure receiving chamber is a closed end and the other end is an open end, and wherein a limit stop (409) is provided at the open end.

14. The scroll compressor of claim 9, wherein a seal ring is disposed between the drive structure and a sidewall of the drive structure receiving chamber.

15. The scroll compressor of claim 9, wherein the drive structure is coaxially disposed with the medium pressure adjustment block, the drive structure is movable in an axial direction of the fixed scroll, a drive rotation screw (502 c) is disposed on the drive structure, and a driven rotation screw (501 c) mated with the drive rotation screw (502 c) is disposed at a second end of the rod portion.

16. The scroll compressor of claim 15, wherein a first plane is further provided between the start and end points of the driven rotary screw surface (502 c), and a second plane is further provided between the start and end points of the driven rotary screw surface (501 c) that mates with the first plane.

17. The scroll compressor of claim 15, wherein the non-orbiting scroll (201) includes a cover plate (508) and a guide pin (509), the guide pin (509) movably disposed through the cover plate (508) and fixedly coupled to the drive structure.

18. The scroll compressor of claim 17, wherein the guide pin (509) is disposed offset from an axis of the drive structure.

19. The scroll compressor according to claim 9, wherein a suction communication passage (201 c) that communicates the suction port (201 a) and the intake pressure chamber is provided in the fixed scroll (201).

20. The scroll compressor of claim 1, wherein the drive structure is a servo motor (602), and a motor shaft of the servo motor (602) is capable of controlling the medium pressure regulating block to move in the predetermined movement track.

21. An air conditioner comprising a scroll compressor, wherein the scroll compressor is the scroll compressor of any one of claims 1 to 20.

22. A control method of a scroll compressor for controlling the scroll compressor of claim 21, comprising the steps of:

acquiring suction pressure and discharge pressure of the scroll compressor;

and adjusting the rotation angle of a motor shaft of a servo motor (602) of the scroll compressor according to the difference value of the suction pressure and the discharge pressure.