阅读说明：本技术 一种双缸变容压缩机及控制方法 (Double-cylinder variable-capacity compressor and control method ) 是由 余洋 周丹 陈凯强 王大号 黄忠雄 肖仁 于 2019-08-23 设计创作，主要内容包括：本发明提供一种双缸变容压缩机及其控制方法,双缸变容压缩机包括有壳体、设置于壳体内部的电机和缸体组件,电机与缸体组件通过曲轴连接,缸体组件包括有变容腔组件、密封组件和齿轮油泵,密封组件固定于变容腔组件与齿轮油泵之间,曲轴上开通有延伸至曲轴顶部的空腔,密封组件上开设有与变容腔组件连通的连通通道,空腔一端与所述电机上腔连通,另一端与所述连通通道的出口连通,该压缩机可以根据压缩机在空调的实际使用环境自由切换单缸运行模式和双缸运行模式,在双缸运行模式时可保证变容部件尾部高压气体为气态,一方面提高双缸运行时的能效,另一方面提高压缩机单双缸切换时的稳定性,达到节能和高可靠性的目的。(The invention provides a double-cylinder variable-capacity compressor and a control method thereof, the double-cylinder variable-capacity compressor comprises a shell, a motor and a cylinder assembly which are arranged in the shell, the motor is connected with the cylinder assembly through a crankshaft, the cylinder assembly comprises a variable-capacity cavity assembly, a sealing assembly and a gear oil pump, the sealing assembly is fixed between the variable-capacity cavity assembly and the gear oil pump, a cavity extending to the top of the crankshaft is formed on the crankshaft, a communicating channel communicated with the variable-capacity cavity assembly is formed on the sealing assembly, one end of the cavity is communicated with an upper cavity of the motor, the other end of the cavity is communicated with an outlet of the communicating channel, the compressor can freely switch a single-cylinder operation mode and a double-cylinder operation mode according to the actual use environment of the compressor in an air conditioner, high-pressure gas at the tail part of the variable-capacity assembly can be ensured to, the purposes of energy conservation and high reliability are achieved.)

1. The utility model provides a double-cylinder varactor compressor, including the casing, set up in inside motor and the cylinder body subassembly of casing, the motor with the cylinder body subassembly passes through bent axle and connects its characterized in that: the cylinder body assembly comprises a variable-volume cavity assembly, a sealing assembly and a gear oil pump, the sealing assembly is fixed between the variable-volume cavity assembly and the gear oil pump, a cavity penetrating through a crankshaft is formed in the crankshaft, a communicating channel communicated with the variable-volume cavity assembly is formed in the sealing assembly, one end of the cavity is communicated with the upper cavity of the motor, and the other end of the cavity is communicated with an outlet of the communicating channel.

2. A twin cylinder variable capacity compressor as defined in claim 1 wherein: the variable-volume cavity assembly comprises an upper air cylinder and a lower air cylinder, the upper air cylinder is located at the upper end of the lower air cylinder, a roller capable of eccentrically rotating is arranged in the lower air cylinder, a sliding sheet which is in circumferential collision with the roller is arranged at one end of the roller, a pin capable of limiting the position of the sliding sheet is arranged at the lower end of the sliding sheet, and a spring is fixed at the lower end of the pin.

3. A twin cylinder variable capacity compressor as defined in claim 2 wherein: the central line of the communication channel coincides with the central line of the slide sheet, and the diameter ∅ d of the communication channel is smaller than the thickness H of the slide sheet.

4. A twin cylinder variable capacity compressor as defined in claim 3 wherein: the radial distance L from the communication channel to the central line of the crankshaft meets the following conditions: 1/2 times lower cylinder bore diameter D + slip sheet length L₁-1/2 x the diameter of the communication channel ∅ d ≥ L ≥ ∅ d₁-1/2 × lower cylinder bore diameter D + vane length L₁+1/2 × communication channel diameter ∅ d.

5. A twin cylinder variable capacity compressor as defined in claim 2 wherein: the backflow liquid distributor is fixed at the two ends of the shell, the variable-volume component is communicated with the lower air cylinder, the backflow liquid distributor is communicated with the upper air cylinder and the lower air cylinder respectively, the first electromagnetic valve is located between an air suction port of the backflow liquid distributor and the variable-volume component, and the second electromagnetic valve is located between an air exhaust port of the compressor body and the variable-volume component.

6. A twin cylinder variable capacity compressor as defined in claim 1 wherein: gear oil pump with be located lower extreme bent axle and with the cavity intercommunication of bent axle, gear oil pump is including oil pump base, oil pump outer rotor, oil pump inner rotor and oil pump baffle, the oil pump inner rotor is located oil pump outer rotor upper end, oil pump outer rotor and oil pump inner rotor all are fixed in between oil pump base and the oil pump baffle, the oil pump baffle is fixed in on the oil pump base.

7. A twin cylinder variable capacity compressor as defined in claim 1 wherein: the sealing assembly comprises a lower flange and a lower cover plate, the lower cover plate is fixed at the lower end of the lower flange, and the communicating channel is arranged on the lower flange and the lower cover plate.

8. The control method of the double cylinder variable capacity compressor as claimed in any one of claims 1 to 7, comprising a single cylinder operation mode and a double cylinder operation mode, characterized in that: when the compressor is in a free switching single-cylinder operation mode and a double-cylinder operation mode, the cavity arranged on the crankshaft is matched with the communicating channel communicated with the variable-volume cavity assembly, and the variable-volume cavity assembly and the inner cavity of the shell form a loop, so that residual high-pressure gas in the variable-volume cavity assembly can enter the cavity along the communicating channel and flow into an upper cavity of the motor from the cavity, and the high-pressure gas at the tail of the variable-volume cavity assembly is ensured to be in a gaseous state in the double-cylinder operation mode.

9. The control method of the double cylinder variable displacement compressor according to claim 5, wherein: the single cylinder operating mode includes the steps of:

(1) closing the second electromagnetic valve and opening the first electromagnetic valve;

(2) the air suction pipe is communicated with the variable volume component, the tail part of a slip sheet of the variable volume cylinder is low-pressure gas, the low-pressure gas enters the head part of a pin head, the head part and the back part of the pin head are both low-pressure gas, and a pin locks the slip sheet due to the action of spring force;

(3) after the sliding sheet returns to the sliding sheet groove to lock the pin, the lower end face of the sliding sheet is communicated with the inlet of the channel in a sealing mode, so that the variable-capacity component and the gear oil pump are blocked, and low-pressure-level gas is prevented from being communicated with the inner cavity of the compressor;

(4) the compressor operates in a single cylinder.

10. A method of controlling a twin cylinder variable capacity compressor as claimed in claim 5, wherein: the two-cylinder operating mode comprises the following steps:

(1) closing the first electromagnetic valve and opening the second electromagnetic valve;

(2) the air suction pipe of the compressor is disconnected with the variable volume component, the air discharge pipe is communicated with the variable volume component, high-pressure-level gas enters the head part of the pin, the head part of the pin is high-pressure, low-pressure-level gas is at the back part, and the pin returns to the lower flange;

(3) the sliding sheet does reciprocating motion, the communicating channel is periodically communicated with the variable volume component along with the movement of the sliding sheet, so that the variable volume component is communicated with the gear oil pump, and the variable volume component and the high pressure in the compressor form circulation along with the driving of the gear oil pump by the crankshaft;

(4) the compressor has a double cylinder running ring.

Technical Field

The invention relates to the technical field of air conditioner compressors, in particular to a double-cylinder variable-capacity compressor and a control method.

Background

At present, in order to meet the requirements of users on high efficiency, energy conservation and comfort of air-conditioning products, a variable-capacity compressor is adopted to replace a traditional variable-frequency compressor, the structure of a double-cylinder variable-capacity compressor is shown in figure 7, the variable-capacity compressor has two operation modes of a single cylinder and a double cylinder, when the load of an air conditioner is small, the single-cylinder operation mode is adopted, the requirements of the user on the lowest load and high energy efficiency are met, when the load of the air conditioner is large, the double-cylinder operation mode is adopted to meet the requirement of the user on large cooling capacity, at present, the variable-capacity compressor is mainly controlled by pins to operate in a single cylinder or in double cylinders, when the pins lock a lower slip sheet, the lower cylinder idles, the compressor realizes single-cylinder operation, when the pins return, the double cylinders of the compressor operate, the control of the pins is mainly controlled by, however, the high pressure of the pin head is led into the tail part of the sliding sheet and the pin head part of the pin through the variable volume component through the exhaust port, the tail part of the sliding sheet and the pin head part belong to a relatively sealed environment, when the high-pressure refrigerant gas passes through the variable volume component, the ambient temperature around the variable volume component is low, and after the high-pressure refrigerant gas runs for a long time, the refrigerant of the variable volume component is converted into a liquid state from a gas state, and the liquid refrigerant can generate the following effects: firstly, get into the compression chamber through the clearance in gleitbretter and the gleitbretter groove, lead to the compressor performance to reduce, secondly when the compressor is switched into the single cylinder by double-cylinder operating mode, the liquid refrigerant in the varactor part needs the gasification back, and the dowel could normally lock the gleitbretter, leads to switching unstability, takes place control desynchronization even.

Disclosure of Invention

In view of the above, one of the objectives of the present invention is to provide a double-cylinder variable displacement compressor, which can freely switch between a single-cylinder operation mode and a double-cylinder operation mode according to the actual use environment of the compressor in the air conditioner, and can ensure that the high-pressure gas at the tail of the variable displacement component is in a gaseous state in the double-cylinder operation mode, thereby improving the energy efficiency in the double-cylinder operation, and improving the stability of the compressor in the single-double-cylinder switching process, so as to achieve the purposes of energy saving and high reliability.

One of the purposes of the invention is realized by the following technical scheme:

the embodiment of the invention provides a double-cylinder variable-capacity compressor, which comprises a shell, a motor and a cylinder body assembly, wherein the motor and the cylinder body assembly are arranged in the shell, the motor and the cylinder body assembly are connected through a crankshaft, the cylinder body assembly comprises a variable-capacity cavity assembly, a sealing assembly and a gear oil pump, the sealing assembly is fixed between the variable-capacity cavity assembly and the gear oil pump, a cavity penetrating through the crankshaft is formed in the crankshaft, a communication channel communicated with the variable-capacity cavity assembly is formed in the sealing assembly, one end of the cavity is communicated with an upper cavity of the motor, and the other end of the cavity is communicated with an outlet of the communication channel.

Furthermore, the variable-volume cavity assembly comprises an upper air cylinder and a lower air cylinder, the upper air cylinder is located at the upper end of the lower air cylinder, a roller capable of eccentrically rotating is arranged in the lower air cylinder, a sliding sheet which is in circumferential collision with the roller is arranged at one end of the roller, a pin capable of limiting the position of the sliding sheet is arranged at the lower end of the sliding sheet, and a spring is fixed at the lower end of the pin.

Furthermore, the central line of the communication channel coincides with the central line of the slide sheet, and the diameter ∅ d of the communication channel is smaller than the thickness H of the slide sheet.

Further, the radial distance L from the center line of the crankshaft to the communication channel meets the following condition: 1/2 times lower cylinder bore diameter D + slip sheet length L₁-1/2 x the diameter of the communication channel ∅ d ≥ L ≥ ∅ d₁-1/2 × lower cylinder bore diameter D + vane length L₁+1/2 × communication channel diameter ∅ d.

Furthermore, the compressor further comprises a backflow liquid distributor, a first electromagnetic valve, a second electromagnetic valve and a variable volume component, wherein the backflow liquid distributor and the variable volume component are fixed at two ends of the shell, the variable volume component is communicated with the lower air cylinder, the backflow liquid distributor is respectively communicated with the upper air cylinder and the lower air cylinder, the first electromagnetic valve is located between an air suction port of the backflow liquid distributor and the variable volume component, and the second electromagnetic valve is located between an air exhaust port of the compressor body and the variable volume component.

Further, gear oil pump with be located lower extreme bent axle and with the cavity intercommunication of bent axle, gear oil pump is including oil pump base, oil pump outer rotor, oil pump inner rotor and oil pump baffle, the oil pump inner rotor is located oil pump outer rotor upper end, oil pump outer rotor and oil pump inner rotor all are fixed in between oil pump base and the oil pump baffle, the oil pump baffle is fixed in on the oil pump base.

Furthermore, the sealing assembly comprises a lower flange and a lower cover plate, the lower cover plate is fixed at the lower end of the lower flange, and the communicating channel is arranged on the lower flange and the lower cover plate.

Furthermore, the motor comprises a stator and a rotor, and the rotor is fixed on the stator.

The double-cylinder variable-capacity compressor has the following beneficial effects:

(1) owing to be provided with the gear oil pump for double-cylinder variable volume compressor can drive the gear oil pump operation through the bent axle when working, in time takes out the liquid refrigerant of variable volume part under the double-cylinder mode and separates, forms the circulation with the inside high-pressure gas of compressor, guarantees that double-cylinder operation variable volume part refrigerant is gaseous, and the refrigerant liquefaction when avoiding long-time operation, the disclosure of reducible liquid refrigerant improves the compressor performance.

(2) The invention can also avoid the abnormal phenomenon that the pin switching is unstable when the double-cylinder mode is switched to the single-cylinder operation mode, thereby improving the switching reliability of the compressor.

(3) According to the invention, the cavity arranged on the crankshaft is matched with the communicating channel communicated with the variable volume cavity assembly, so that the variable volume cavity assembly and the inner cavity of the shell form a loop, when the compressor is freely switched between a single-cylinder operation mode and a double-cylinder operation mode, residual high-pressure gas in the variable volume cavity assembly can enter the cavity along the communicating channel and flow into the upper cavity of the motor from the cavity, the tail part of the variable volume component is gaseous high-pressure gas when the double cylinders operate, the performance reduction caused by the liquid refrigerant entering the compressor cavity is avoided, the energy efficiency during the double-cylinder operation is improved, and the stability and the reliability during the double-cylinder and single-cylinder switching are improved.

The invention also aims to avoid the defects in the prior art and provide a control method of the double-cylinder variable-capacity compressor, which can freely switch a single-cylinder operation mode and a double-cylinder operation mode according to the actual use environment of the compressor in an air conditioner, ensure that the tail part of a variable-capacity component is gaseous high-pressure gas during the double-cylinder operation, avoid the performance reduction caused by the liquid refrigerant entering a compressor cavity, improve the energy efficiency during the double-cylinder operation, and simultaneously improve the stability and the reliability during the double-cylinder and single-cylinder switching.

The second purpose of the invention is realized by the following technical scheme:

the embodiment of the invention provides a control method of a double-cylinder variable-capacity compressor, which comprises a single-cylinder operation mode and a double-cylinder operation mode, wherein when the single-cylinder operation mode and the double-cylinder operation mode are freely switched, the compressor can form a loop by matching a cavity arranged on a crankshaft with a communicating channel communicated with a variable-capacity cavity assembly, so that high-pressure gas remained in the variable-capacity cavity assembly can enter the cavity along the communicating channel and flow into an upper cavity of a motor from the cavity, and the high-pressure gas at the tail part of the variable-capacity cavity assembly can be ensured to be gaseous in the double-cylinder operation mode.

Further, the single cylinder operating mode includes the steps of:

(1) closing the second electromagnetic valve and opening the first electromagnetic valve;

(2) the air suction pipe is communicated with the variable volume component, the tail part of a slip sheet of the variable volume cylinder is low-pressure gas, the low-pressure gas enters the head part of a pin head, the head part and the back part of the pin head are both low-pressure gas, and a pin locks the slip sheet due to the action of spring force;

(3) after the sliding sheet returns to the sliding sheet groove to lock the pin, the lower end face of the sliding sheet is communicated with the inlet of the channel in a sealing mode, so that the variable-capacity component and the gear oil pump are blocked, and low-pressure-level gas is prevented from being communicated with the inner cavity of the compressor;

(4) the compressor operates in a single cylinder.

Further, the two-cylinder operating mode includes the steps of:

(1) closing the first electromagnetic valve and opening the second electromagnetic valve;

(2) the air suction pipe of the compressor is disconnected with the variable volume component, the air discharge pipe is communicated with the variable volume component, high-pressure-level gas enters the head part of the pin, the head part of the pin is high-pressure, low-pressure-level gas is at the back part, and the pin returns to the lower flange;

(3) reciprocating motion is made to the gleitbretter, and intercommunication passageway and varactor part are along with the cyclic intercommunication of gleitbretter motion to with varactor part and gear oil pump intercommunication, along with the bent axle drives the gear oil pump operation, varactor part and the inside high pressure of compressor form the circulation.

Has the advantages that: the control method of the double-cylinder variable-capacity compressor can freely switch the single-cylinder and double-cylinder operation modes according to the actual use environment of the compressor in the air conditioner, ensures that the tail part of the variable-capacity component is gaseous high-pressure gas when the double cylinders operate, avoids performance reduction caused by liquid refrigerant entering a compressor cavity, improves the energy efficiency when the double cylinders operate, and simultaneously improves the stability and reliability when the double cylinders and the single cylinder are switched.

Drawings

The invention is further illustrated by means of the attached drawings, but the embodiments in the drawings do not constitute any limitation to the invention, and for a person skilled in the art, other drawings can be derived on the basis of the following drawings without inventive effort.

Fig. 1 is a schematic view of the overall structure of the double cylinder variable displacement compressor of the present invention.

Fig. 2 is a schematic view of the structure of the gear oil pump of the present invention.

FIG. 3 is a schematic diagram of the single cylinder mode of operation of the two cylinder variable displacement compressor of the present invention.

FIG. 4 is a schematic view of the lower cylinder in the single cylinder operation of the present invention.

FIG. 5 is a schematic diagram of the two-cylinder mode of operation of the two-cylinder variable displacement compressor of the present invention.

FIG. 6 is a schematic view of the lower cylinder of the present invention with two cylinders operating.

Fig. 7 is a schematic view of the overall structure of a two-cylinder variable displacement compressor in the prior art.

The figure includes: the variable-capacity oil pump comprises a shell 1, a motor 2, a cylinder body assembly 3, a crankshaft 4, a variable-capacity cavity assembly 5, an upper cylinder 51, a lower cylinder 52, a roller 53, a sliding sheet 54, a sealing assembly 6, a lower flange 61, a lower cover plate 62, a gear oil pump 7, an oil pump base 71, an oil pump outer rotor 72, an oil pump inner rotor 73, an oil pump partition plate 74, a cavity 8, a stator 9, a rotor 10, a communication channel 11, a pin 12, a spring 13, a backflow liquid distributor 14, a first electromagnetic valve 15, a second electromagnetic valve 16, a variable-capacity component 17, an air suction port 18 and an air exhaust port 19.

Detailed Description

The invention is further described with reference to the following examples.

As shown in fig. 1, the embodiment provides a double-cylinder variable displacement compressor, which includes a casing 1, a motor 2 and a cylinder assembly 3 disposed inside the casing 1, the motor 2 includes a stator 9 and a rotor 10, the rotor is sleeved on the rotor 10, the rotor 10 is sleeved on a crankshaft 4, the motor 2 is rotatably connected to the cylinder assembly 3 through the crankshaft 4, the cylinder assembly 3 includes a variable displacement chamber assembly 5, a sealing assembly 6 and a gear oil pump 7, the sealing assembly 6 is bolted between the variable displacement chamber assembly 5 and the gear oil pump 7 for sealing the variable displacement chamber assembly 5, a cavity 8 extending to the top of the crankshaft 4 is opened on the crankshaft 4, a communicating channel 11 communicated with the variable displacement chamber assembly 5 is opened on the sealing assembly 6, further, the sealing assembly 6 includes a lower flange 61 and a lower cover plate 62, the lower cover plate 62 is fixed at the lower end of the lower flange 61, the communicating channel 11 is opened on the lower flange 61 and the lower cover plate 62, one end of the cavity 8 is communicated with the upper cavity of the motor 2, and the other end is communicated with the outlet of the communicating channel 11.

This embodiment is through the cooperation of the intercommunication passageway 11 of cavity 11 and the intercommunication of varactor chamber subassembly 5 that set up on bent axle 11 for varactor chamber subassembly 5 and the inner chamber of casing 1 form a return circuit, when guaranteeing that the compressor freely switches single cylinder running mode and double-cylinder running mode, varactor chamber subassembly 5 inside remaining high-pressure gas can enter into cavity 8 along intercommunication passageway 11, and flow into the epicoele of motor 2 in the cavity 8, avoid varactor chamber subassembly 5 in remaining refrigerant by the gaseous state change into liquid, reduce the production of liquid refrigerant and then avoid following incident to take place:

firstly, liquid refrigerant gets into the compression chamber through the clearance in gleitbretter and the gleitbretter groove, leads to the compressor performance to reduce, secondly when the compressor is switched into single cylinder mode by double-cylinder mode of operation, the liquid refrigerant in the varactor part needs the gasification after, the gleitbretter just can normally be locked to the pin, leads to switching unstability, takes place control desynchronization even.

Further, the energy efficiency during double-cylinder operation and the stability during single-double-cylinder switching of the compressor can be improved, and the purposes of energy conservation and high reliability are achieved.

As shown in fig. 1 and 4, in a preferred embodiment, the variable displacement chamber assembly 5 includes an upper cylinder 51 and a lower cylinder 52, the upper cylinder 51 is located at the upper end of the lower cylinder 52, a roller 53 capable of rotating eccentrically is disposed inside the lower cylinder 52, a sliding piece 54 abutting against the outer circumference of the roller 53 is disposed at one end of the roller 53, a pin 12 is disposed at the lower end of the sliding piece 54, a spring 13 is fixed below the pin 12, and the pin 12 can limit the position of the sliding piece 54.

As shown in FIG. 4, in the preferred embodiment, the center line of the communicating channel 11 coincides with the center line of the sliding piece 54, let the diameter of the communicating channel 11 be ∅ d, the thickness of the sliding piece 54 be H, the diameter ∅ d of the communicating channel 11 be less than the thickness H of the sliding piece 54, let the radial distance of the communicating channel 11 from the center line of the crankshaft 4 be L, and let the length of the sliding piece 54 be L₁Inner diameter D of lower cylinder 52 and outer diameter ∅ D of roller 53₁1/2X inner diameter D of lower cylinder 52 + Length L of slide 54₁-1/2 x the diameter ∅ d of the communication channel 11 is more than or equal to L and more than or equal to the outer diameter ∅ d of the roller 53₁1/2X inner diameter D of lower cylinder 52 + length L of slide 54₁+1/2 × diameter ∅ d of the communication channel 11 not only prevents refrigerant and compressed gas from entering the communication channel 11 in the single cylinder operation mode, but also ensures that the inlet of the communication channel 11 is not blocked by the lower end surface of the sliding vane 54 in the two cylinder operation modeContinuing to block, the inlet of the communication channel 11 is completely blocked by the lower end face of the slide 54 in the single cylinder operation mode.

As shown in fig. 1, in a preferred embodiment, the two-cylinder variable displacement compressor further includes a return flow divider 14, a first solenoid valve 15, a second solenoid valve 16 and a variable displacement component 17, the return flow divider 14 and the variable displacement component 17 are fixed at two ends of the housing 1, the variable displacement component 17 is communicated with the lower cylinder 52, the return flow divider 14 is respectively communicated with the upper cylinder 51 and the lower cylinder 52, the first solenoid valve 15 is located between the suction port 18 of the return flow divider 14 and the variable displacement component 17, the second solenoid valve 16 is located between the exhaust port 19 of the compressor body and the variable displacement component 17, and the variable displacement compressor can be freely switched between a single-cylinder operation mode and a two-cylinder operation mode by cooperation of the first solenoid valve 15, the second solenoid valve 16 and the variable displacement component 17.

As shown in fig. 2, in the preferred embodiment, the gear oil pump 7 is respectively communicated with the communicating channel 11 and the cavity 8 on the crankshaft 4, the gear oil pump 7 includes an oil pump base 71, an oil pump outer rotor 72, an oil pump inner rotor 73 and an oil pump partition 74, the oil pump outer rotor 72 is located in the oil pump inner rotor 73, the oil pump outer rotor 72 is fixed between the oil pump base 71 and the oil pump partition 74, the gear oil pump 7 can be driven by the crankshaft 4 to operate, the liquid refrigerant of the variable volume component 17 in the two-cylinder operation mode is timely pumped away to form a circulation with the high-pressure gas inside the compressor, the refrigerant of the variable volume component 17 in the two-cylinder operation is ensured to be gas, the refrigerant liquefaction caused by long-time operation is avoided, the leakage of the liquid refrigerant is reduced, the performance of the compressor is improved, the switching reliability of the compressor is improved.

The embodiment of the invention also provides a control method of a double-cylinder variable-capacity compressor, which comprises a single-cylinder operation mode and a double-cylinder operation mode, when the single-cylinder operation mode and the double-cylinder operation mode are freely switched, the compressor can form a loop by matching the cavity 8 arranged on the crankshaft 4 with the communicating channel 11 communicated with the variable-capacity cavity assembly 5, so that the high-pressure gas remained in the variable-capacity cavity assembly 5 can enter the cavity 8 along the communicating channel 11 and flow into the upper cavity of the motor 2 from the cavity 8, and the high-pressure gas at the tail of the variable-capacity cavity assembly can be ensured to be gaseous in the double-cylinder operation mode.

3-4, in the preferred embodiment, the compressor single cylinder mode of operation: the method comprises the following steps:

(1) the second solenoid valve 16 is closed and the first solenoid valve 15 is opened.

(2) After the electromagnetic valve 2 is closed, the exhaust port 19 of the compressor is disconnected with the variable volume part 17, the suction port 18 is communicated with the variable volume part 17, the tail part of the sliding piece 54 is low-pressure-level gas, the low-pressure-level gas reaches the head part of the pin 12, the tail part of the pin 12 is always communicated with the low-pressure-level suction port 18, the back part and the head part of the pin 12 are both low pressure, the pin 12 locks the sliding piece 54 under the action of the spring 13 force, the lower end face of the locked sliding piece 54 blocks the inlet of the communication channel 11, and the suction port.

(3) After the sliding sheet 54 returns to the sliding sheet groove to lock the pin 12, the lower end face of the sliding sheet 12 is hermetically communicated with the inlet of the channel, so that the variable volume component 17 and the gear oil pump are blocked, and low-pressure-stage gas is prevented from being communicated with the inner cavity of the compressor;

(4) the lower cylinder 52 loses its compression function and the compressor is in a single cylinder mode of operation.

As shown in fig. 5-6, in the preferred embodiment, the compressor has two-cylinder operating modes: the method comprises the following steps:

(1) the first solenoid valve 15 is closed and the second solenoid valve 16 is opened.

(2) After the first electromagnetic valve 15 is closed, the air suction port 18 of the compressor is disconnected from the variable volume part 17, the exhaust port 19 is communicated with the variable volume part 17, the tail part of the slide sheet 54 is high-pressure-level gas, the high-pressure-level gas reaches the head part of the pin 12, the back part of the pin 12 is low-pressure-level gas, the pin 12 is pressed to return to the lower flange 61, gaseous refrigerant enters the gear oil pump 7 through the communication channel 11 of the lower flange 61, the gear oil pump 7 is driven to rotate in the rotor when the crankshaft 4 rotates, under the action of the gear oil pump 7, refrigerant in the communication channel 11 is pumped into the cavity 8 of the crankshaft 4 and flows into the upper cavity of the motor 2 through the.

(3) The sliding sheet 54 reciprocates, and the communicating channel 11 and the variable volume part 17 are periodically communicated along with the movement of the sliding sheet 54, so that the variable volume part 17 is communicated with the gear oil pump 7, and the variable volume part 17 and the high pressure in the compressor form circulation along with the operation of the gear oil pump 7 driven by the crankshaft 4.

(4) The lower cylinder 52 resumes compression and the compressor transitions to a two cylinder mode of operation.

Compared with the prior art, the invention has the following beneficial effects: the gear oil pump is arranged, so that when the double-cylinder variable-capacity compressor works, the gear oil pump can be driven to operate through the crankshaft, the liquid refrigerant of the variable-capacity component in a double-cylinder mode is timely pumped away to form circulation with high-pressure gas in the compressor, the refrigerant of the variable-capacity component in the double-cylinder operation is guaranteed to be gas, the refrigerant is prevented from being liquefied after long-time operation, leakage is reduced, and the performance of the compressor is improved; meanwhile, the tail of the variable volume component is gaseous high-pressure gas through a communicating channel which is arranged on the crankshaft and is communicated with the variable volume cavity assembly, so that the situation that liquid refrigerant enters a compressor cavity to cause performance reduction is avoided, the energy efficiency during double-cylinder operation is improved, and the stability and the reliability during double-cylinder and single-cylinder switching are improved.

Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the protection scope of the present invention, although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.