CN107893758B - Scroll compressor and air conditioner with same - Google Patents
Scroll compressor and air conditioner with same Download PDFInfo
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- CN107893758B CN107893758B CN201711088128.8A CN201711088128A CN107893758B CN 107893758 B CN107893758 B CN 107893758B CN 201711088128 A CN201711088128 A CN 201711088128A CN 107893758 B CN107893758 B CN 107893758B
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- back pressure
- passage
- scroll compressor
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- 230000006835 compression Effects 0.000 claims abstract description 50
- 238000007906 compression Methods 0.000 claims abstract description 50
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- 230000008859 change Effects 0.000 abstract description 6
- 239000003921 oil Substances 0.000 description 57
- 238000000034 method Methods 0.000 description 15
- 230000008569 process Effects 0.000 description 10
- 239000012535 impurity Substances 0.000 description 7
- 239000003507 refrigerant Substances 0.000 description 7
- 230000035772 mutation Effects 0.000 description 6
- 238000013519 translation Methods 0.000 description 5
- 238000005299 abrasion Methods 0.000 description 3
- 238000009825 accumulation Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000012530 fluid Substances 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000004378 air conditioning Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000010687 lubricating oil Substances 0.000 description 2
- 238000005461 lubrication Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
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- 230000002159 abnormal effect Effects 0.000 description 1
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- 230000000903 blocking effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
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- 230000007774 longterm Effects 0.000 description 1
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- 230000007246 mechanism Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000010726 refrigerant oil Substances 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 230000000452 restraining effect Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 238000009966 trimming Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
- F04C18/02—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents
- F04C18/0207—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents both members having co-operating elements in spiral form
- F04C18/0215—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents both members having co-operating elements in spiral form where only one member is moving
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C28/00—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Rotary Pumps (AREA)
- Applications Or Details Of Rotary Compressors (AREA)
Abstract
The invention provides a scroll compressor and an air conditioner with the same, wherein the scroll compressor comprises: the shell is provided with a first air suction port and a first air exhaust port; the fixed vortex plate and the movable vortex plate are arranged in the shell, and the fixed vortex plate is provided with a second air suction port communicated with the first air suction port and a second air exhaust port communicated with the first air exhaust port; the first bracket is arranged at one side of the movable scroll, which is far away from the fixed scroll, and the movable scroll is provided with a back pressure channel which is communicated with a compression cavity of the scroll compressor and a back pressure cavity of the scroll compressor; and the switch structure is arranged in the back pressure channel to control the on-off of the back pressure channel. The technical scheme of the invention effectively solves the problem of abrupt pressure change at the incision in the prior art.
Description
Technical Field
The invention relates to the field of compressors, in particular to a scroll compressor and an air conditioner with 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 closed working chambers. Under the drive of the crankshaft, the movable vortex winds around the center of the fixed vortex disk, the rotation-free translation is carried out by the fixed radius of gyration, the crescent working cavity continuously moves towards the center, the volume of the crescent working cavity is continuously reduced, the pressure is continuously increased until the crescent working cavity is communicated with the center 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. Therefore, designing a suitable back pressure is a key technique for achieving high efficiency and high reliability for scroll compressors.
In the patent structural proposal with the application number of 201210023627.X, a back pressure structure of a scroll compressor is adopted, the scroll compressor is provided with a notch part at the joint surface of a fixed scroll and an orbiting scroll, the fixed vortex plate and the orbiting vortex plate are provided with a passage, a compression chamber side communication port and a back pressure chamber side communication port which are matched with each other, so that the medium pressure back pressure chamber and the compression chamber are periodically and intermittently communicated, and proper medium pressure back pressure is obtained.
The notch part of the fixed vortex plate is arranged at the joint surface of the orbiting vortex plate and the fixed vortex plate, and the pressure of the gas in the compression chamber is periodically changed along with the continuous periodical change of the crankshaft, so that the local pressure of the notch part of the fixed vortex plate is periodically changed along with the compression chamber, and particularly, the pressure of the notch part suddenly drops or rises at the moment that the communication port at the back pressure chamber side is communicated with or cut off from the notch part, so that the pressure mutation occurs. Due to local pressure fluctuation and abrupt change of the notch part, the local position attaching force at the attaching surface of the orbiting scroll and the fixed scroll fluctuates and even suddenly changes, so that abrasion or adhesion is easily caused at the local position of the orbiting scroll and the fixed scroll; in addition, the cut part is easy to accumulate impurities such as scrap iron and the like, even more likely to cause abnormal wear and even sticking at that location. All of the above problems will directly affect the scroll compressor efficiency and reliability.
Disclosure of Invention
The invention aims to provide a scroll compressor and an air conditioner with the same, so as to solve the problem of abrupt pressure change at a notch in the prior art.
In order to achieve the above object, according to one aspect of the present invention, there is provided a scroll compressor comprising: the shell is provided with a first air suction port and a first air exhaust port; the fixed vortex plate and the movable vortex plate are arranged in the shell, and the fixed vortex plate is provided with a second air suction port communicated with the first air suction port and a second air exhaust port communicated with the first air exhaust port; the first bracket is arranged at one side of the movable scroll, which is far away from the fixed scroll, and the movable scroll is provided with a back pressure channel which is communicated with a compression cavity of the scroll compressor and a back pressure cavity of the scroll compressor; and the switch structure is arranged in the back pressure channel to control the on-off of the back pressure channel.
Further, the back pressure passage includes a receiving passage provided in the base plate of the orbiting scroll, and an intake passage communicating the compression chamber and the receiving passage, and the switching structure is provided in the receiving passage.
Further, the receiving passage extends in a radial direction of the base plate of the orbiting scroll.
Further, the switch structure is a control rod, the control rod can move in the accommodating channel, the first end of the control rod can penetrate out of the movable scroll and is matched with the inner wall of the first bracket, and the control rod is provided with a closed position for shielding the air inlet channel and a first open position for avoiding the air inlet channel.
Further, the control lever includes a lever body and a first communication passage provided on the lever body, the first communication passage being communicated with the air intake passage when the control lever is in the first open position.
Further, the back pressure channel further comprises an air outlet channel communicated with the back pressure cavity and the accommodating channel, and the air outlet channel is communicated with the first communication channel when the control rod is located at the first opening position.
Further, the air outlet channel is a groove provided on the inner wall of the accommodation channel.
Further, the scroll compressor further comprises an oil storage cavity, the back pressure channel further comprises an oil inlet channel communicated with the accommodating channel and the oil storage cavity, the control rod further comprises a second opening position for avoiding the oil inlet channel, the control rod further comprises a second communication channel arranged on the rod body, and the second communication channel corresponds to a third opening of the back pressure channel when the control rod is located at the second opening position.
Further, the control lever further includes a partition portion for partitioning the first communication passage and the second communication passage, and when the partition portion is mated with the intake passage, the control lever is in the closed position and the back pressure passage is in the open state.
Further, the second communication passage is located inside the first communication passage.
Further, a reset structure is further arranged in the back pressure channel, and the reset structure can enable the control rod to move from the first opening position to the second opening position.
Further, the reset structure is a spring, the spring and the control rod are coaxially arranged in the accommodating channel, and the second end of the control rod is matched with the spring.
According to another aspect of the present invention, there is provided an air conditioner including a compressor, which is the above-described scroll compressor.
By adopting the technical scheme of the invention, the on-off between the back pressure cavity and the compression cavity is controlled in a mode of matching the back pressure channel and the switch structure, so that the tightness of the compression cavity is ensured, meanwhile, the pressure in the back pressure cavity can be better controlled, the excessive pressure between the contact surfaces of the movable vortex plate and the vortex plate is avoided, and the friction power consumption is increased. According to the technical scheme, the mode that the notch is formed in the joint surface of the fixed scroll and the movable scroll to enable the compression chamber to be connected with the back pressure chamber is replaced in the prior art, and further local pressure fluctuation and mutation in the notch of the fixed scroll during operation of the scroll compressor are avoided, so that the problems that the movable scroll and the fixed scroll wear or adhere near the notch, impurities are accumulated in the notch of the fixed scroll, and reliability caused by the accumulation of the impurities is further avoided.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention. In the drawings:
FIG. 1 shows a schematic cross-sectional structural view of an embodiment of a scroll compressor according to the present invention;
FIG. 2 shows an enlarged partial schematic view of the scroll compressor of FIG. 1 at A;
FIG. 3 illustrates an enlarged partial schematic view of the scroll compressor of FIG. 1 in another state;
FIG. 4 illustrates a schematic view of the orbiting scroll of the scroll compressor of FIG. 2;
FIG. 5 illustrates a schematic structural view of a control rod of the scroll compressor of FIG. 2;
FIG. 6 illustrates a schematic view of the scroll compressor operation of FIG. 1; and
fig. 7 shows a schematic diagram of compression chamber pressure versus crank angle for the scroll compressor of fig. 1.
Wherein the above figures include the following reference numerals:
3. a motor driving part; 10. a suction side region; 11. a compression chamber; 12. an exhaust side region; 13. a back pressure chamber; 14. a high pressure back pressure chamber; 15. an oil storage chamber; 100. a housing; 101. air suction pipe the method comprises the steps of carrying out a first treatment on the surface of the; 102. an exhaust pipe; 201. a fixed scroll; 201a, a second exhaust port; 202. an orbiting scroll; 202a, an air inlet channel; 202b, an air outlet channel; 202c, an oil inlet channel; 202d, a receiving channel; 203. a first bracket; 203a, an oil return passage; 204. a crankshaft; 204a, an oil supply channel; 205. a cross slip ring; 206. a second bracket; 207. a seal ring; 208. a drive bearing; 209. main bearing the method comprises the steps of carrying out a first treatment on the surface of the; 210. a sub-bearing; 211. a thrust bearing; 212. an oil suction pipe; 213. an oil guiding sheet; 214. a sheet metal part; 301. a rotor; 302. a stator; 401. a control lever; 401a, a first communication channel; 401b, a second communication channel; 402. and (3) a spring.
Detailed Description
The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present application. 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 one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present 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 example embodiments in accordance with 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.
As shown in fig. 1, the scroll compressor of the present embodiment includes a housing 100, a fixed scroll 201, an orbiting scroll 202, a first bracket 203, and a switching structure. The casing 100 is provided with a first air inlet and a first air outlet, the first air inlet is provided with an air suction pipe 101, and the first air outlet is provided with an air discharge pipe 102. The fixed scroll 201 and the movable scroll 202 are disposed in an upper space of the housing 100 and rigidly connected to the housing 100 by a first bracket 203. The fixed scroll 201 is provided with a second suction port communicating with the first suction port and a second discharge port 201a communicating with the first discharge port, a compression chamber 11 is formed between the fixed scroll 201 and the movable scroll 202. The first bracket 203 is disposed on one side of the movable scroll 202 away from the fixed scroll 201, a back pressure chamber 13 is formed among the first bracket 203, the fixed scroll 201 and the movable scroll 202, and a back pressure channel is disposed on the movable scroll 202 to communicate the compression chamber 11 and the back pressure chamber 13. The switch structure is arranged in the back pressure channel to control the on-off of the back pressure channel.
The scroll compressor of the present embodiment further includes a second bracket 206 provided in the lower space of the housing 100, a main bearing 209 is provided in the first bracket 203, and a sub-bearing 210 is provided in the second bracket 206. The crankshaft 204 is penetrated in a main bearing 209 and a sub bearing 210 to radially support the crankshaft 204. A thrust bearing 211 is also provided below the second bracket 206 to support the crankshaft 204 in the axial direction. The motor driving part 3 is sleeved on the crankshaft 204 and arranged between the first bracket 203 and the second bracket 206. The stator 302 and the housing 100 are rigidly connected by interference fit, and the rotor 301 and the crankshaft 204 are rigidly connected by interference fit. The rotor 301 can rotate at a high speed relative to the stator 302, and one end of the crankshaft 204 is matched with the movable scroll 202, so that power is transmitted through the crankshaft 204 to drive the movable scroll 202 to perform rotary translation with a certain radius of gyration around the center of the fixed scroll 201.
Specifically, as shown in fig. 1, a fixed scroll 201 is rigidly connected to a first bracket 203 by bolts, and an orbiting scroll 202 is installed between the first bracket 203 and the fixed scroll 201; the fixed scroll 201 and the movable scroll 202 are respectively provided with a scroll tooth, and the two scroll teeth 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 cavities, and the working cavities can be called a suction cavity and a compression cavity according to different working states. The movable scroll 202 is coupled to the first bracket 203 by a cross slip ring 205, and the cross slip ring 205 can prevent the movable scroll 202 from rotating. On the other hand, a bearing chamber is arranged on the back surface of the movable scroll 202, a driving bearing 208 is installed in an interference manner, and the driving bearing 208 and an eccentric part at the upper end of the crankshaft 204 are mutually nested. Therefore, the orbiting scroll 202 can perform a rotational translational motion with a constant radius of revolution around the fixed scroll 201, as shown in fig. 6, by the driving action of the crankshaft 204 and the restraining action of the cross slip ring 205 against rotation. In the process of the rotary translation, the gas in the crescent compression cavity 11 continuously moves towards the center, and the air pressure continuously increases along with the continuous reduction of the volume of the compression cavity 11 until the gas is communicated with the second exhaust port 201a of the fixed scroll 201, and the high-pressure refrigerant is discharged out of the scroll pump body and enters the exhaust side area 12, so that the suction and compression effects of the refrigerant are realized.
By adopting the technical scheme of the embodiment, the on-off between the back pressure cavity 13 and the compression cavity 11 is controlled in a mode of matching the back pressure channel and the switch structure, so that the tightness of the compression cavity 11 is ensured, meanwhile, the pressure in the back pressure cavity 13 can be better controlled, the excessive pressure between the contact surfaces of the movable scroll and the scroll is avoided, and the friction power consumption is increased. According to the technical scheme, the mode that the notch is formed in the joint surface of the fixed scroll and the movable scroll to enable the compression chamber to be connected with the back pressure chamber is replaced in the prior art, and further local pressure fluctuation and mutation in the notch of the fixed scroll during operation of the scroll compressor are avoided, so that the problems that the movable scroll and the fixed scroll wear or adhere near the notch, impurities are accumulated in the notch of the fixed scroll, and reliability caused by the accumulation of the impurities is further avoided.
Specifically, as shown in fig. 1 to 5, the back pressure passage of the present embodiment includes a housing passage provided in the base plate of the orbiting scroll 202 and an intake passage 202a communicating the compression chamber 11 and the housing passage, and a switching structure is provided in the housing passage 202 d.
Preferably, the receiving channel of the present embodiment extends in the radial direction of the base plate of the orbiting scroll 202. The above structure is easy to process and shortens the length of the airflow path as much as possible.
Preferably, as shown in fig. 1 to 5, the switch structure of the present embodiment is a control lever 401, the control lever 401 is capable of moving in the accommodating passage, a first end of the control lever 401 is capable of penetrating out of the movable scroll 202 and cooperating with an inner wall of the first bracket 203, and the control lever 401 has a closed position blocking the intake passage 202a and a first open position avoiding the intake passage 202 a. The movable scroll 202 makes a rotary translation in the first bracket 203, and thus drives the control rod 401 to move in the base plate of the movable scroll 202. When the control lever 401 is in the closed position, the control lever 401 can block the intake passage 202a so that the gas in the compression chamber 11 cannot enter the back pressure chamber 13; when the control lever 401 is in the first open position, the control lever 401 can avoid the intake passage 202a, so that the intake passage 202a communicates with the compression chamber 11, and gas can enter the back pressure chamber 13 to provide pressure for the orbiting scroll 202.
Specifically, as shown in fig. 5, the lever 401 of the present embodiment includes a lever body and a first communication passage 401a provided on the lever body, the first communication passage 401a communicating with the intake passage 202a when the lever 401 is in the first open position. The back pressure channel of this embodiment further includes an air outlet channel 202b that communicates the back pressure chamber 13 and the accommodating channel, as shown in fig. 2, when the control lever 401 is in the first open position, the air outlet channel 202b communicates with the first communication channel 401a, so that the compression chamber 11 is in communication with the back pressure chamber 13. At this time, the fluid can enter the back pressure chamber 13 from the compression chamber 11 through the intake passage 202a, the first communication passage 401a, and the outlet passage 202b, providing it with the intermediate-pressure fluid. The dashed line in the figure is drawn to indicate the direction of flow of the refrigerant gas.
As shown in fig. 3, the air outlet channel 202b is cut off from the first communication channel 401a when the lever 401 is located at the closed position from the first open position. At this time, the first communication passage 401a and the intake passage 202a are positioned offset from each other and there is no overlap region, the intake passage 202a is closed by the control lever 401, and the compression chamber 11 is not communicated with the back pressure chamber 13. This allows the back pressure chamber 13 to be intermittently connected to or disconnected from the compression chamber 11 in accordance with the rotation of the crankshaft, thereby providing an appropriate pressure to the back pressure chamber 13.
Preferably, the outlet channel 202b of the present embodiment is a groove provided on the inner wall of the receiving channel. The structure can be obtained by drilling two long holes in the base plate of the movable scroll 202 along the radial direction, and the processing is convenient and easy to realize.
As shown in fig. 1, the scroll compressor of the present embodiment further includes an oil storage chamber 15 provided at a lower portion of the housing 100, an oil guide plate 213 and an oil suction pipe 212 are provided at a lower end of the crankshaft 204, and an oil supply passage 204a is provided in the crankshaft 204. When the scroll compressor is operated, the crankshaft 204 rotates at a high speed to rotate the oil guide 213. The oil guide plate 213 has an oil pumping function, and can pump oil in the oil reservoir chamber 15 to the upper end of the crankshaft 204 during rotation. The crankshaft 204 guides the refrigerant oil or lubricant oil in the oil storage chamber 15 into the bearing chamber of the orbiting scroll 202 through the oil guide plate 213 and the oil suction pipe 212 and the oil supply passage 204a to reduce friction of the driving bearing 208. In addition, an oil return passage 203a is provided in the first bracket 203 to form an oil supply circulation path so that the refrigerating oil or the lubricating oil can circulate back to the oil reservoir chamber 15.
Optionally, a sheet metal part 214 is further provided below the outlet of the oil return passage 203a in the present embodiment to guide the oil to the oil storage chamber 15.
Simultaneously with the oil supply cycle, the refrigerant enters the suction side region 10 from the suction pipe 101 connected to the outlet of the system evaporator, and enters the suction chamber between the scroll 202 and the fixed scroll 201. As the crankshaft 204 continues to drive, the suction chamber is closed and begins to compress into a compression chamber, the compression chamber gas continues to be compressed to a certain pressure, and enters the discharge side area 12 through the discharge port 201a 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.
Further, as shown in fig. 1 to 3, the back pressure channel of the present embodiment further includes an oil inlet channel 202c communicating the accommodating channel and the oil reservoir 15, the control lever 401 further has a second open position avoiding the oil inlet channel 202c, the control lever 401 further includes a second communication channel 401b provided on the lever body, and the second communication channel 401b corresponds to the third opening of the back pressure channel when the control lever 401 is located at the second open position. The oil inlet channel 202c communicates with the oil storage chamber 15 through the oil guide plate 213, the oil suction pipe 212 and the oil supply channel 204a, and when the second communication channel 401b communicates with the air inlet channel 202a, oil in the bearing chamber can enter the compression chamber 11, so as to lubricate the contact surface between the movable scroll and the fixed scroll. When the second communication passage 401b is not in communication with the intake passage 202a, the compression chamber 11 and the oil reservoir chamber 15 are shut off. The above-described process can control the angular range when the compression chamber 11 communicates with the oil reservoir chamber 15 by controlling the dimensions of the intake passage 202a and the second communication passage 401b, thereby controlling the oil supply amount of the oil reservoir chamber 15 to the compression chamber 11.
Specifically, as shown in fig. 5, the control rod 401 of the present embodiment is in a cylindrical rod shape, the first communication channel 401a and the second communication channel 401b are grooves formed inward from the cylindrical surface of the control rod 401, the accommodating channel is a cylindrical channel adapted to the structure of the control rod, and the air outlet channel is a groove formed on the side wall of the accommodating channel. When the control lever 401 is inserted into the accommodating passage, the groove and the inner wall of the accommodating passage form a passage through which the fluid passes, and the gas flows to the back pressure chamber through the first communication passage and the gas outlet passage.
In embodiments not shown in the other figures, the first communication channel 401a and the second communication channel 401b may also perform a fluid-conducting function in the form of a through-hole penetrating in the lever body of the control lever; accommodating channels and levers the shape may also be adapted accordingly, the air outlet channel and the accommodating channel can be combined to form a regular shape so as to facilitate the processing of the movable vortex plate.
Further, the lever 401 further includes a partition portion for partitioning the first communication passage 401a and the second communication passage 401b, and when the partition portion is engaged with the intake passage 202a, the lever 401 is in the closed position and the back pressure passage is in the open state. The first communication passage 401a and the second communication passage 401b are located on both sides of the partition portion, respectively, so that the intake passage 202a can communicate only with the first communication passage 401a or the second communication passage 401b at the same time, and the sealing property is improved.
Preferably, as shown in fig. 4 to 6, the second communication passage 401b of the present embodiment is located inside the first communication passage 401 a. Inside here means a side closer to the axis with respect to the orbiting scroll 202 so that the lever 401 passes through the first open position, the closed position, and the second open position in order from inside to outside in the accommodating passage.
Further, as shown in fig. 1 to 3, a reset structure is further provided in the back pressure channel of the present embodiment, and the reset structure can move the control lever 401 from the first open position to the second open position. When the orbiting scroll 202 is rotated, the control lever 401 is moved toward the axis of the orbiting scroll 202 by the restriction of the first bracket 203, and is moved from the closed position to the first open position. The reset structure enables the lever 401 to return to the closed position when unconstrained by the first bracket 203, enabling the reciprocating cycle of the motion of the lever 401. For the present embodiment with the second open position, the reset structure can also enable the control lever 401 to move from the closed position to the second open position, so as to realize the function of controlling the on-off of the oil path.
Preferably, the return structure of this embodiment is a spring 402, the spring 402 is coaxially arranged in the receiving channel with the lever 401, and the second end of the lever 401 is engaged with the spring 402. The spring 402 is of a simple construction and, is easy to obtain and low in cost.
As shown in fig. 6, the crank shaft 204 rotates counterclockwise to control the brake vortex disc 202 to do counterclockwise rotary translation in the drawing, and a, b, c, d is respectively in a state when the crank shaft rotates at four different angles in the moving process.
During the process of fig. 6 a to b, the control rod 401 moves downward with respect to the fixed scroll 201 and moves near the axis with respect to the movable scroll 202. When the rotation angle θ=θ1, the first communication passage 401a communicates with the intake passage 202a, and as θ increases, the first communication passage 401a communicates with the intake passage 202a and the flow passage area gradually increases, and the compressed gas gradually enters the back pressure chamber 13 and provides back pressure to the orbiting scroll 202.
During the process of b to c in fig. 6, the control rod 401 continues to move downward relative to the fixed scroll 201 and moves away from the axis relative to the movable scroll 202. As θ increases, the first communication passage 401a is connected to the intake passage 202a and the flow passage area gradually decreases, the compressed gas can still enter the back pressure chamber 13 and provide a back pressure to the orbiting scroll 202, and when the rotational angle θ=θ2, the lever 401 moves to the closed position, and the first communication passage 401a is shut off from the intake passage 202 a.
During the process of c through d in fig. 6, the control rod 401 moves upward relative to the fixed scroll 201 and continues to move away from the axis relative to the orbiting scroll 202. As the rotation angle θ increases, the second communication passage 401b is connected to the intake passage 202a and the flow passage area gradually increases, and the liquid gradually enters the compression chamber 11 under pressure and provides lubrication to the orbiting scroll 202.
During the process d to a in fig. 6, the control rod 401 continues to move upward relative to the fixed scroll 201 and moves closer to the axis relative to the movable scroll 202. As the rotation angle theta increases, the second communication passage 401b is connected to the intake passage 202a and the flow passage area gradually decreases, liquid can still enter the compression chamber 11 and provide lubrication to the orbiting scroll 202 until the lever 401 is moved to the closed position.
The graph of fig. 7 schematically shows the relationship between the air pressure and the crank angle in the compression chamber 11, and as can be seen from the graph of fig. 7, the pressure of the scroll compressor of the present embodiment changes smoothly in the range of θ1 to θ2, so that the performance damage caused by abrupt change of the working state can be effectively reduced, and the long-term use of the compressor is facilitated.
The above-described process can obtain the desired start rotation angle θ1 and end rotation angle θ2 by controlling the position of the first communication passage 401a with respect to the intake passage 202a and the length thereof so that the back pressure chamber 13 obtains a proper pressure. Similarly, the rotation angle range when the compression chamber 11 communicates with the oil reservoir chamber 15 can be controlled by controlling the sizes of the intake passage 202a and the second communication passage 401b, thereby controlling the oil supply amount of the oil reservoir chamber 15 to the compression chamber 11.
In the scroll compressor of this embodiment, the back pressure chamber 13 and the compression chamber 11 are periodically and intermittently connected or disconnected through the control rod 401, so that a suitable back pressure is obtained, the tightness between the movable scroll and the fixed scroll is ensured, and meanwhile, the excessive adhesion acting force between the movable scroll and the fixed scroll is avoided, and the friction power consumption is influenced. On the other hand, in this embodiment, there is no need to provide a notch at the joint between the fixed scroll 201 and the movable scroll 202, so that abrasion or adhesion between the movable scroll 202 and the fixed scroll 201 at the local position of the notch due to local pressure fluctuation and abrupt change of the notch of the fixed scroll 201 is avoided. And the back pressure channel is communicated with the back pressure cavity 13 at the side surface of the movable scroll 202, so that fluctuation or mutation of stress at the two sides of the movable scroll caused by pressure fluctuation or mutation at the moment of connecting or disconnecting the back pressure cavity 13 with the compression cavity 11 is avoided. In the scroll compressor of the embodiment, the back pressure channel can effectively avoid abrasion or adhesion of the movable scroll 202 and the fixed scroll 201 on the premise of obtaining proper back pressure, and the movable scroll 202 can run more stably, so that the performance and reliability of the compressor are improved, and vibration and noise are reduced.
In addition, the back pressure chamber 13 of the scroll compressor of the present embodiment is a medium pressure back pressure chamber, and the scroll compressor of the present embodiment further includes a high pressure back pressure chamber 14. As shown in fig. 1 to 3, the high-pressure back pressure chamber 14 is a space for the rotation of the crankshaft 204, and the back pressure chamber 13 and the high-pressure back pressure chamber 14 are sealed by a seal ring 207, but at the same time, the seal ring 207 is provided with a slit to supply the refrigerating oil or lubricating oil in the high-pressure back pressure chamber 14 to the back pressure chamber 13, and lubricate and cool the friction pair in the back pressure chamber 13. Oil led from the oil storage cavity 15 enters the high-pressure back pressure chamber 14 through a gap or a trimming passage between the driving bearing 208 and the crankshaft 204, then most of the oil flows back to the oil storage cavity 15 through an oil return passage 203a, a small part of the oil can enter the back pressure cavity 13 through a notch where the sealing ring 207 is positioned to cool and lubricate each friction pair, and the frozen oil enters the compression cavity 11 through a joint surface between the movable scroll 202 and the fixed scroll 201 or a communication passage between the back pressure cavity 13 and the compression cavity 11 to lubricate, cool and seal the friction pairs between scroll teeth.
The present application also provides an air conditioner, and an embodiment of the air conditioner (not shown in the drawings) according to the present application includes a compressor, which is the scroll compressor described above. The air conditioner of the embodiment has the characteristic of smooth transition between the back pressure cavity and the compression cavity, has the advantage of long service life.
From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:
the on-off between the back pressure cavity and the compression cavity is controlled in a mode of matching the back pressure channel and the switch structure, so that the tightness of the compression cavity is ensured, meanwhile, the pressure in the back pressure cavity can be better controlled, the surplus pressure between the contact surfaces of the movable scroll and the through scroll is avoided, and the friction power consumption is increased. According to the technical scheme, the mode that the notch is formed in the joint surface of the fixed scroll and the movable scroll to enable the compression chamber to be connected with the back pressure chamber is replaced in the prior art, and further local pressure fluctuation and mutation in the notch of the fixed scroll during operation of the scroll compressor are avoided, so that the problems that the movable scroll and the fixed scroll wear or adhere near the notch, impurities are accumulated in the notch of the fixed scroll, and reliability caused by the accumulation of the impurities is further avoided.
In the description of the present application, it should be understood that, where azimuth terms such as "front, rear, upper, lower, left, right", "transverse, vertical, horizontal", and "top, bottom", etc., indicate azimuth or positional relationships generally based on those shown in the drawings, only for convenience of description and simplification of the description, 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 merely for convenience of distinguishing the corresponding components, and unless otherwise stated, the terms have no special meaning, and thus 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 (11)
1. A scroll compressor, comprising:
the shell is provided with a first air suction port and a first air exhaust port;
a fixed scroll (201) and an movable scroll (202) which are arranged in the shell, wherein a second air suction port communicated with the first air suction port and a second air discharge port (201 a) communicated with the first air discharge port are arranged on the fixed scroll (201);
the first bracket (203) is arranged on one side of the movable scroll (202) away from the fixed scroll (201), and a back pressure channel which is communicated with a compression cavity (11) of the scroll compressor and a back pressure cavity (13) of the scroll compressor is arranged on the movable scroll (202);
the switch structure is a control rod (401), and the control rod (401) is movably arranged in the back pressure channel so as to control the on-off of the back pressure channel;
the back pressure channel comprises a containing channel arranged in a base plate of the movable scroll (202) and an air inlet channel (202 a) communicated with the compression cavity (11) and the containing channel, and the switch structure is arranged in the containing channel;
the control rod (401) can move in the accommodating channel, the first end of the control rod (401) can penetrate out of the movable scroll (202) and is matched with the inner wall of the first bracket (203), and the control rod (401) is provided with a closed position for shielding the air inlet channel (202 a) and a first open position for avoiding the air inlet channel (202 a);
and a reset structure is further arranged in the back pressure channel, and the second end of the control rod (401) is matched with the reset structure.
2. The scroll compressor of claim 1, wherein the receiving channel extends in a radial direction of a base plate of the orbiting scroll (202).
3. The scroll compressor according to claim 1, wherein the control rod (401) includes a rod body and a first communication passage (401 a) provided on the rod body, the first communication passage (401 a) communicating with the intake passage (202 a) when the control rod (401) is in the first open position.
4. A scroll compressor according to claim 3, wherein the back pressure passage further comprises an outlet passage (202 b) communicating the back pressure chamber (13) and the receiving passage, the outlet passage (202 b) communicating with the first communication passage (401 a) when the lever (401) is in the first open position.
5. The scroll compressor of claim 4, wherein the outlet channel (202 b) is a groove provided on an inner wall of the receiving channel.
6. A scroll compressor according to claim 3, further comprising an oil reservoir (15), wherein the back pressure passage further comprises an oil inlet passage (202 c) communicating the receiving passage and the oil reservoir (15), wherein the control rod (401) further has a second open position clear of the oil inlet passage (202 c), the control lever (401) further comprises a second communication channel (401 b) arranged on the lever body, and the second communication channel (401 b) corresponds to the third opening of the back pressure channel when the control lever (401) is positioned at the second opening position.
7. The scroll compressor of claim 6, wherein the control rod (401) further comprises a partition for partitioning the first communication passage (401 a) and the second communication passage (401 b), the control rod (401) being in a closed position and the back pressure passage being in an open state when the partition is mated with the intake passage (202 a).
8. The scroll compressor according to claim 7, wherein the second communication channel (401 b) is located inside the first communication channel (401 a).
9. The scroll compressor of claim 7, wherein the return structure is capable of moving the lever (401) from the first open position to the second open position.
10. The scroll compressor of claim 9, wherein the return structure is a spring (402), the spring (402) being disposed in the receiving channel coaxially with the lever (401), a second end of the lever (401) cooperating with the spring (402).
11. An air conditioner comprising a compressor, wherein the compressor is the scroll compressor according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711088128.8A CN107893758B (en) | 2017-11-06 | 2017-11-06 | Scroll compressor and air conditioner with same |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711088128.8A CN107893758B (en) | 2017-11-06 | 2017-11-06 | Scroll compressor and air conditioner with same |
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| CN107893758A CN107893758A (en) | 2018-04-10 |
| CN107893758B true CN107893758B (en) | 2024-04-16 |
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| CN201711088128.8A Active CN107893758B (en) | 2017-11-06 | 2017-11-06 | Scroll compressor and air conditioner with same |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109654016A (en) * | 2018-12-17 | 2019-04-19 | 珠海格力节能环保制冷技术研究中心有限公司 | Screw compressor, air conditioner and screw compressor backpressure regulation method |
| CN113123970B (en) * | 2019-12-31 | 2023-11-14 | 比亚迪股份有限公司 | Compressor and vehicle with same |
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| CN205117718U (en) * | 2015-10-21 | 2016-03-30 | 广东美的暖通设备有限公司 | Be used for maintaining scroll compressor backpressure stable structure and scroll compressor |
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| CN106368946A (en) * | 2016-11-24 | 2017-02-01 | 广东美的暖通设备有限公司 | Enhanced vapor injection scroll compressor and air conditioner system |
| CN207420860U (en) * | 2017-11-06 | 2018-05-29 | 珠海格力电器股份有限公司 | Screw compressor and with its air conditioner |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20160081431A (en) * | 2014-12-31 | 2016-07-08 | 삼성전자주식회사 | Scroll compressor and air conditioner having the same |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH02294584A (en) * | 1989-05-02 | 1990-12-05 | Matsushita Electric Ind Co Ltd | Scroll compressor |
| CN201517504U (en) * | 2009-07-16 | 2010-06-30 | 上海日立电器有限公司 | Controllable structure of back pressure gas quality exchange |
| CN201574931U (en) * | 2009-11-09 | 2010-09-08 | 珠海格力电器股份有限公司 | Vortex compressor |
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| CN207420860U (en) * | 2017-11-06 | 2018-05-29 | 珠海格力电器股份有限公司 | Screw compressor and with its air conditioner |
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| CN107893758A (en) | 2018-04-10 |
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