CN218151421U - Compressor and refrigerating system - Google Patents

Abstract

The utility model belongs to the technical field of compressors, in particular to a compressor and a refrigeration system, wherein a pump body component comprises a first cylinder and a second cylinder; the compressor is provided with a first working mode, a second working mode and a third working mode, wherein the first working mode is a working mode that the first cylinder and the second cylinder respectively carry out primary compression; the second working mode is a working mode that the first cylinder performs primary compression and the second cylinder performs secondary compression; the third working mode is a working mode that the first cylinder performs primary compression, the second cylinder performs secondary compression and air supplementing and enthalpy increasing are carried out; the compressor is provided with a switching mechanism, and the switching mechanism is used for switching the compressor among the first working mode, the second working mode and the third working mode. The utility model discloses a compressor can realize the extension of cold volume scope and can realize the expansion of operating mode scope again.

Description

Compressor and refrigerating system

Technical Field

The utility model belongs to the technical field of the compressor, especially, relate to a compressor and refrigerating system.

Background

The double-cylinder double-stage compressor has the characteristic of high efficiency and stability in a low-temperature environment, and when the double-cylinder double-stage compressor operates under a light working condition, the pressure ratio and the pressure difference are lower, and the second cylinder of the double-cylinder compressor is equivalent to waste and is not fully utilized. Under the light working condition, the cold range of the double-cylinder single-stage compressor can be further expanded compared with that of a double-cylinder double-stage compressor, and the reliability of the compressor is greatly influenced under the low-temperature environment. Therefore, a compressor needs to be provided, which can expand the range of the cooling capacity and the range of the working condition.

In view of this special the utility model is put forward.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model lies in overcoming the not enough of prior art, provides one kind and can realize the extension of cold volume scope and can realize compressor and refrigerating system that the operating mode scope extends again.

In order to solve the above technical problem, a first aspect of the present invention provides a compressor, which includes a casing, wherein a pump body assembly is disposed in the casing; the pump body assembly comprises a first cylinder and a second cylinder; the compressor is provided with a first working mode, a second working mode and a third working mode, wherein

The first working mode is a working mode in which the first cylinder and the second cylinder respectively perform primary compression;

the second working mode is a working mode that the first cylinder performs primary compression and the second cylinder performs secondary compression;

the third working mode is a working mode in which the first cylinder performs primary compression, the second cylinder performs secondary compression and the air supply and enthalpy increase are carried out;

the compressor is provided with a switching mechanism, and the switching mechanism is used for switching the compressor among the first working mode, the second working mode and the third working mode.

Further optionally, a first air inlet and a second air inlet are formed on one side of the pump body assembly, a first exhaust port and an air supplement port are formed on the other side of the pump body assembly, and a second exhaust port is formed at the top of the shell; the first cylinder comprises a first compression cavity and the second cylinder comprises a second compression cavity;

the first air inlet is used for introducing air into the first compression cavity, and the first air outlet is used for exhausting air from the first compression cavity; the second air inlet is used for air inlet of the second compression cavity, the second air outlet is used for air exhaust of the second compression cavity, and the air supplementing port is used for supplementing air to the second compression cavity.

Further optionally, the pump body assembly is provided with the second cylinder, the second partition plate, the first cylinder and the lower flange assembly in sequence from top to bottom;

the first intake port is formed on the first cylinder;

the first exhaust port is formed on the lower flange assembly;

a mixing cavity is formed between the first partition plate and the second partition plate, the second air inlet and the air supplementing port are respectively communicated with the mixing cavity, the mixing cavity is communicated with the second compression cavity, and the second air inlet and the air supplementing port are respectively formed on the first partition plate.

Further optionally, a first air inlet pipe is connected to the first air inlet, a second air inlet pipe is connected to the second air inlet, the air supplementing port is connected to the air supplementing pipe, the first exhaust pipe is connected to the first exhaust port, the second exhaust port is connected to the second exhaust pipe, and a connecting pipe is arranged between the first exhaust port and the second air inlet;

the switching mechanism controls the first air inlet pipe, the second air inlet pipe, the first exhaust pipe, the second exhaust pipe, the air supplementing pipe and the connecting pipe to be switched on and off so as to enable the compressor to be switched among the first working mode, the second working mode and the third working mode.

Further optionally, a first liquid separator is connected between the first air inlet pipe and the first air inlet; a second liquid separator is connected between the second air inlet pipe and the second air inlet; and an air supplementing and enthalpy increasing knockout is connected between the air supplementing port and the air supplementing pipe.

Further optionally, the switching mechanism comprises:

the first control valve is arranged on the second air inlet pipe;

the second control valve is arranged on the connecting pipe;

the third control valve is arranged on the air supplementing pipe;

and the fourth control valve is arranged on the first exhaust pipe.

Further optionally, an inlet of the connecting pipe is communicated with the first exhaust pipe, and an outlet of the connecting pipe is communicated with the second intake pipe; the switching mechanism further comprises:

a first three-way valve that communicates the second intake pipe with the connection pipe;

a second three-way valve that communicates the first exhaust pipe with the connection pipe;

the first control valve is positioned on the second air inlet pipe between the inlet of the second air inlet pipe and the first three-way valve;

the fourth control valve is located on the first exhaust pipe between the second three-way valve and the outlet of the first exhaust port.

A second aspect of the present invention provides a refrigeration system, comprising a first heat exchanger, a second heat exchanger, a flash evaporator and the compressor provided in the first aspect;

the first end of the first heat exchanger is communicated with the first end of the flash evaporator, the second end of the flash evaporator is communicated with the first end of the second heat exchanger, the second end of the second heat exchanger is respectively communicated with the first air inlet pipe and the second air inlet pipe, and the second end of the first heat exchanger is respectively communicated with the first exhaust pipe and the second exhaust pipe; and the third end of the flash evaporator is communicated with the air supplementing pipe.

Further optionally, the refrigeration system further comprises a first throttling valve disposed between the first end of the first heat exchanger and the first end of the flash evaporator, and a second throttling valve disposed between the second end of the flash evaporator and the second end of the second heat exchanger.

After the technical scheme is adopted, compared with the prior art, the utility model following beneficial effect has:

the utility model discloses a single compressor rational design pump body subassembly structure, realize a plurality of breathing in and exhaust passage, can realize that first cylinder carries out the one-level compression, the second cylinder carries out the double-cylinder of second grade compression two work pattern of breathing in single stage cycle, can realize again that first cylinder carries out the one-level compression, the second cylinder that the second cylinder carried out the second grade compression single double-cylinder of breathing in is singly breathed in the doublestage and is not taken the second work pattern of enthalpy increase circulation and first cylinder and carry out the one-level compression, the second cylinder carries out the second grade compression and takes the double-cylinder of tonifying qi enthalpy increase to singly breathe in the doublestage and take the third work pattern of enthalpy increase circulation. The utility model discloses a switching of multiple mode can be realized to a compressor, reduces installation space, reduce cost.

The utility model discloses a multiple mode switches the operating range of extension compressor that can step forward, and double-cylinder pair is breathed in single-stage mode and is compared double-cylinder pair and is singly breathed in the doublestage area and increase the cold volume scope of enthalpy circulation more extensively, and double-cylinder pair is breathed in single-stage mode and is compared double-cylinder pair and is breathed in the enthalpy circulation and can move lower evaporating temperature, the operating mode scope of extension compressor.

The following describes the embodiments of the present invention in further detail with reference to the attached drawings.

Drawings

The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, the illustrative embodiments and the description of the invention serve to explain the invention without unduly limiting the invention. It is obvious that the drawings in the following description are only some embodiments, and that for a person skilled in the art, other drawings can be derived from them without inventive effort. In the drawings:

FIG. 1: is the structure diagram of the compressor of the embodiment of the utility model.

FIG. 2: do the utility model discloses compressor complete machine top view.

FIG. 3: is the section view of the pump body assembly of the embodiment of the utility model.

FIG. 4 is a schematic view of: is a refrigeration system diagram of the embodiment of the utility model.

FIG. 5: do the utility model discloses refrigerating system refrigerant flow direction schematic diagram when the compressor is in first mode.

FIG. 6: do the utility model discloses refrigerating system refrigerant flow direction schematic diagram when the compressor is in second mode.

FIG. 7: do the utility model discloses refrigerating system refrigerant flow direction schematic diagram when the compressor is in third mode.

Wherein: 1-a compressor; 2-a first heat exchanger; 3-a first throttle valve; 4-a flash tank; 5-a second throttle valve; 6-a second heat exchanger; 7-a first control valve; 8-a second control valve; 9-a third control valve; 10-a fourth control valve; 20-a housing; 21-first liquid separator; 211-a first intake duct; 22-a second liquid separator; 221-a second intake duct; 23-a motor; 24-a cover assembly; 241-a second exhaust port; 25-a second exhaust pipe; 26-a pump body assembly; 27-enthalpy-increasing liquid separator; 28-a first exhaust pipe; 30-a crankshaft; 31-an upper flange assembly; 32-a second cylinder; 33-a second separator; 34-a first separator; 35 a first cylinder; 36-a lower flange assembly; 37-lower flange cover plate; 351-a first air inlet; 361-first exhaust port; 341-second air inlet; 342-air supplement port; 41-connecting pipe; 42-air supplement pipe;

it should be noted that the drawings and the description are not intended to limit the scope of the inventive concept in any way, but rather to illustrate the inventive concept by those skilled in the art with reference to specific embodiments.

Detailed Description

In the description of the present invention, it should be noted that the terms "inside", "outside", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," "contacting," and "communicating" are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present invention can be understood as a specific case by those skilled in the art.

The present embodiment proposes a compressor 1, as shown in fig. 1-3, including a housing 20, a motor 23 and a pump body assembly 26 are disposed in the housing 20; the pump block assembly 26 includes a crankshaft 30, a first cylinder 35, and a second cylinder 32; the compressor 1 comprises a first working mode that the first cylinder 35 and the second cylinder 32 respectively perform primary compression, a second working mode that the first cylinder 35 performs primary compression and the second cylinder 32 performs secondary compression, and a third working mode that the first cylinder 35 performs primary compression and the second cylinder 32 performs secondary compression and has air-supplementing enthalpy-increasing function; the compressor 1 further comprises a switching mechanism for switching the compressor 1 between a first operation mode, a second operation mode and a third operation mode.

The pump body subassembly structure of rational design through single compressor of this embodiment, realize a plurality of breathing in and exhaust passage, can realize that first cylinder carries out the one-level compression, the second cylinder carries out the two cylinders of second grade compression and two first mode of breathing in single stage cycle, can realize again that first cylinder carries out the one-level compression, the second mode that the two cylinders of second grade compression are singly breathed in the doublestage and are not taken the enthalpy increase circulation and first cylinder carry out the one-level compression, the second cylinder carries out the two-stage compression and takes the double-cylinder of tonifying qi enthalpy to singly breathe in the doublestage and take the third mode of enthalpy increase circulation. The embodiment adopts a compressor to realize the switching of multiple modes, reduces installation space, reduce cost. Simultaneously, the operating range of the compressor can be further expanded by switching various working modes, the double-cylinder double-suction single-stage mode is wider than the double-cylinder single-suction double-stage area enthalpy-increasing circulation cold range, and the double-cylinder single-suction double-stage area enthalpy-increasing circulation can operate at a lower evaporation temperature and expand the working condition range of the compressor compared with the double-cylinder double-suction single-stage mode. The compressor 1 of the present embodiment is optionally a rotary compressor 1.

Further alternatively, referring to fig. 1 and 3, a first air inlet 351 and a second air inlet 341 are formed on one side of the pump body assembly 26, a first air outlet 361 and an air supplement port 342 are formed on the other side of the pump body assembly 26, a second air outlet 241 is formed on the top of the casing 20, and optionally, an upper cover assembly 24 is formed on the top of the casing 20, and a second air outlet is located on the upper cover assembly 24; the first cylinder 35 includes a first compression chamber, and the second cylinder 32 includes a second compression chamber; the first intake port 351 is used for supplying air to the first compression chamber, and the first exhaust port 361 is used for exhausting air from the first compression chamber; the second inlet 341 is used for feeding air to the second compression cavity, the second outlet 241 is used for discharging air from the second compression cavity, and the air supplement port 342 is used for supplementing air to the second compression cavity.

Further alternatively, referring to fig. 3, the pump body assembly 26 is provided with an upper flange assembly 31, a second cylinder 32, a second partition 33, a first partition 34, a first cylinder 35, a lower flange assembly 36 and a lower flange group cover plate 37 from top to bottom in sequence; the first intake port 351 is formed on the first cylinder 35; a first exhaust port 361 is formed on the lower flange assembly 31; a mixing chamber is formed between the first partition plate 34 and the second partition plate 33, the second gas inlet 341 and the gas supplementing port 342 are respectively communicated with the mixing chamber, the mixing chamber is communicated with the second compression chamber, and the second gas inlet 341 and the gas supplementing port 342 are respectively formed on the first partition plate 34. In the present embodiment, the air path structure formed between the upper flange assembly 31, the first cylinder, and the first air inlet 351 and the first air outlet 361, and the air path structure formed between the second cylinder, the lower flange assembly, the second air inlet 341 and the second air outlet 241 all belong to compressor air path structures known in the art, and for example, on the premise that no upper silencer is provided, the refrigerant discharged from the upper flange assembly 31 is directly discharged to the lower cavity of the motor, then passes through the gap between the stator and the rotor or the flow hole on the stator and the rotor, and then is discharged out of the compressor housing through the second air outlet 241. If under the prerequisite that is equipped with the muffler, arrange the amortization intracavity portion earlier, then arrange the motor lower chamber again, then reach the motor upper chamber again, then arrange outside the casing through the second blast pipe. In addition, the flange is provided with an air hole, the cylinder is provided with a crescent groove, the air hole corresponds to the crescent groove, when the pressure in the compression cavity is higher than the back pressure of the valve plate, namely the pressure in the lower cavity of the motor, the valve plate is pushed open, and then exhaust is realized.

A mixing cavity is formed between the first middle partition plate and the second middle partition plate assembly, so that the air supplement and enthalpy increase of low-pressure circulation are realized, the exhaust temperature of the low-pressure circulation is reduced, the refrigerating capacity of unit mass is improved, and the refrigerating efficiency of the low-temperature circulation is improved; meanwhile, the mixing cavity also forms an air inlet cavity of the second air cylinder 32, and double-cylinder double-suction circulation is realized.

Further alternatively, referring to fig. 4, the first air inlet 351 is connected with the first air inlet pipe 211, the second air inlet 341 is connected with the second air inlet pipe 221, the air supplementing port 342 is connected with the air supplementing pipe 42, the first air outlet 361 is connected with the first air outlet pipe 28, the second air outlet 241 is connected with the second air outlet pipe 25, and a connecting pipe 41 is arranged between the first air outlet 361 and the second air inlet 341; the switching mechanism switches the compressor 1 among the first operation mode, the second operation mode, and the third operation mode by controlling on/off of the first intake pipe 211, the second intake pipe 221, the first exhaust pipe 28, the second exhaust pipe 25, the air supply pipe 42, and the connection pipe 41. Optionally, a first divider 21 is connected between the first air inlet pipe 211 and the first air inlet 351; a second liquid separator 22 is connected between the second air inlet pipe 221 and the second air inlet 341; an air-supplementing enthalpy-increasing knockout 27 is connected between the air-supplementing port 342 and the air-supplementing pipe 42.

Further optionally, referring to fig. 4, the switching mechanism comprises: a first control valve 7 provided on the second intake pipe 221; a second control valve 8 provided on the connection pipe 41; a third control valve 9 provided on the air replenishing pipe 42; a fourth control valve 10 provided on the first exhaust pipe 28.

Further alternatively, referring to fig. 4, the inlet of the connecting pipe 41 is communicated with the first exhaust pipe 28, and the outlet is communicated with the second intake pipe 221; the switching mechanism still includes: a first three-way valve that communicates the second intake pipe 221 with the connection pipe 41; the second three-way valve communicates the first exhaust pipe 28 with the connection pipe 41; the first control valve 7 is located on the second intake pipe 221 between the inlet of the second intake pipe 221 and the first three-way valve; the fourth control valve 10 is located on the first exhaust pipe 28 between the second three-way valve and the outlet of the first exhaust port 361.

The compressor 1 of this embodiment can realize the switching of three kinds of working modes, and different working modes can be adapted to different application environment, and first working mode (double-cylinder pair inhale single-stage circulation) can make the cylinder volume of compressor 1 obtain maximize utilization, and when adopting this mode under the light condition, the discharge capacity of compressor 1 is the volume sum of upper and lower jar, and the cold volume scope of compressor 1 obtains further promotion under this mode. And in a third working mode (a double-cylinder double-stage enthalpy-increasing mode), the compressor 1 is suitable for the situation that the outdoor environment is severe, the exhaust temperature of the compressor 1 can be reduced, and the refrigerating capacity per unit mass is improved, so that the performance of the compressor 1 is improved, and the service life of the compressor is prolonged. And a second working mode (a two-cylinder two-stage closing enthalpy increasing mode) which is used as a transition mode.

The embodiment also proposes a refrigeration system, see fig. 4, which comprises a first heat exchanger 2, a second heat exchanger 6, a flash evaporator 4 and the above-mentioned compressor 1; the first end of the first heat exchanger 2 is communicated with the first end of the flash evaporator 4, the second end of the flash evaporator 4 is communicated with the first end of the second heat exchanger 6, the second end of the second heat exchanger 6 is respectively communicated with the first air inlet pipe 211 and the second air inlet pipe 221, and the second end of the first heat exchanger 2 is respectively communicated with the first exhaust pipe 28 and the second exhaust pipe 25; the third end of the flash evaporator 4 is communicated with an air supplementing pipe 42.

Further optionally, the refrigeration system further comprises a first throttling valve 3 and a second throttling valve 5, the first throttling valve 3 being arranged between a first end of the first heat exchanger 2 and a first end of the flash evaporator 4, the second throttling valve 5 being arranged between a second end of the flash evaporator 4 and a second end of the second heat exchanger 6.

The embodiment further provides a control method of the refrigeration system, where the control method includes:

the compressor 1 is controlled to switch between the first operation mode, the second operation mode, and the third operation mode.

Further optionally, the control method comprises: when the compressor 1 is in the first working mode, the switching mechanism is controlled to respectively conduct the first air inlet pipe 211, the first exhaust pipe 28, the second air inlet pipe 221 and the second exhaust pipe 25, and disconnect the air supplementing pipe 42 and the connecting pipe 41; when the compressor 1 is in the second working mode, the switching mechanism is controlled to conduct the first air inlet pipe 211, the second air outlet pipe 25 and the connecting pipe 41, and disconnect the second air inlet pipe 221, the first air outlet pipe 28 and the air supplementing pipe 42; when the compressor 1 is in the third operation mode, the switching mechanism is controlled to turn on the first intake pipe 211, the second exhaust pipe 25, the air supply pipe 42, and the connection pipe 41, respectively, and turn off the second intake pipe 221 and the first exhaust pipe 28.

Further alternatively, when the switching mechanism includes the first control valve 7 provided on the second intake pipe 221, the second control valve 8 provided on the connection pipe 41, the third control valve 9 provided on the air replenishment pipe 42, and the fourth control valve 10 provided on the first exhaust pipe 28, the control method includes:

when the compressor 1 is in the first working mode, the first control valve 7 and the fourth control valve 10 are controlled to be opened, and the second control valve 8 and the third control valve 9 are controlled to be closed; when the compressor 1 is in the second working mode, the first control valve 7, the third control valve 9 and the fourth control valve 10 are controlled to be closed, and the second control valve 8 is controlled to be opened; and when the compressor 1 is in the third working mode, the first control valve 7 and the fourth control valve 10 are controlled to be closed, and the second control valve 8 and the third control valve 9 are controlled to be opened.

The following describes the control of the three control modes of the compressor of the refrigeration system of the present embodiment in detail:

first mode of operation (two cylinders double suction single stage cycle): referring to fig. 5, the first control valve and the fourth control valve are opened, and the second control valve and the third control valve are closed. The low-temperature low-pressure refrigerant from the second heat exchanger 6 enters the first cylinder 35 and the second cylinder 32 through the first liquid separator 21 and the second liquid separator 22 respectively for compression, the refrigerant compressed by the first cylinder 32 is firstly discharged to a lower flange component exhaust cavity formed by the lower flange component 36 and the lower flange group cover plate 37, then is discharged out of the shell of the compressor through the first exhaust pipe 28, passes through the fourth control valve of the valve and then is mixed with the refrigerant discharged by the refrigerant compressed by the second cylinder 32 through the second exhaust pipe 25, the mixed refrigerant enters the first heat exchanger 2, then is condensed by the first heat exchanger 2 to become high-temperature super-cooled high-pressure refrigerant, the high-temperature super-cooled refrigerant is throttled by the throttle valve to become low-temperature low-pressure gas-liquid mixed refrigerant, then absorbs heat for evaporation in the second heat exchanger 6, and then returns to the first liquid separator 21 and the second liquid separator 22 to return to the compressor, thereby completing a cycle.

In the second operating mode (two-cylinder single-suction two-stage no enthalpy-increasing mode), see fig. 6, the first, third and fourth control valves are closed, and the second control valve is opened. The low-temperature and low-pressure refrigerant from the second heat exchanger 6 enters the first air cylinder 35 through the first liquid separator 21, the refrigerant compressed by the first air cylinder 35 is firstly discharged to a lower flange component exhaust cavity formed by the lower flange component 36 and the lower flange group cover plate 37, then is discharged out of the compressor shell through the first exhaust pipe 28, then enters the second liquid separator 22 through the second control valve, then enters a mixing cavity formed by the second intermediate partition plate 33 and the intermediate partition plate of the first intermediate partition plate 34, then enters the second air cylinder 32 for compression, and then is discharged out of the compressor through the second exhaust pipe, the high-temperature and high-pressure refrigerant is condensed by the first heat exchanger 2 to become high-temperature and high-pressure subcooled refrigerant, the high-temperature and high-pressure subcooled refrigerant enters the flash evaporator 4 after being throttled and depressurized by the first throttle valve 3, the liquid refrigerant at the bottom of the flash evaporator 4 passes through the second throttle valve 5 to become a low-temperature and low-pressure gas-liquid mixture, enters the second heat exchanger 6, and returns to the first liquid separator 21 after being subjected to complete a cycle after being subjected to heat absorption and gasification in the second heat exchanger 6.

Third operating mode (double-cylinder single-suction double-stage enthalpy-increasing mode): referring to fig. 7, the first control valve and the fourth control valve are closed, and the second control valve and the third control valve are opened. The low-temperature low-pressure refrigerant from the second heat exchanger 6 enters the first cylinder 35 through the first liquid separator 21, the refrigerant compressed by the first cylinder 35 is firstly discharged to a lower flange component exhaust cavity formed by the lower flange component 36 and the lower flange group cover plate 37, then is discharged out of the shell of the compressor through the first exhaust pipe 28, then enters the second liquid separator 22 through the second control valve, then enters the second intermediate partition plate 33 and the first intermediate partition plate 34 to be mixed with the refrigerant from the flash evaporator 4, so as to play a role in reducing the first-stage exhaust temperature of the compressor, the refrigerant mixed in the mixing cavity formed by the intermediate partition plates enters the second cylinder to be compressed and then is discharged out of the compressor through the second exhaust pipe 25, the high-temperature high-pressure refrigerant is condensed by the first heat exchanger 2 to become high-temperature high-pressure subcooled refrigerant, the high-temperature high-pressure subcooled refrigerant is throttled and depressurized by the first throttle valve 3 and then enters the flash evaporator 4, and is divided into two streams in the flash evaporator 4. The liquid refrigerant at the bottom of the flash evaporator 4 is changed into a low-temperature and low-pressure gas-liquid mixture through the second-stage throttle valve 5, enters the second heat exchanger 6, absorbs heat and gasifies in the second heat exchanger 6, then returns to the first liquid separator 21 to complete a cycle, and the gaseous refrigerant in the second heat exchanger 6 enters a mixing cavity formed by the second intermediate partition plate 33 and the first intermediate partition plate 34 through the enthalpy-increasing liquid separator 27 to be mixed with the medium-temperature and medium-pressure refrigerant from the lower cavity, and then enters the second cylinder 32 to complete the cycle. The mode enables the compressor to realize wider operation range and higher pressure ratio, and can realize temperature reduction and increase the refrigerating capacity per unit mass under the condition of high pressure ratio, thereby realizing the improvement of compression performance.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and although the present invention has been disclosed with reference to the above preferred embodiment, but not to limit the present invention, any person skilled in the art can make some changes or modifications to equivalent embodiments without departing from the scope of the present invention, and any simple modification, equivalent change and modification made to the above embodiments by the technical spirit of the present invention still fall within the scope of the present invention.

Claims (9)

1. The compressor is characterized by comprising a shell, wherein a pump body assembly is arranged in the shell; the pump body assembly comprises a first cylinder and a second cylinder; the compressor is provided with a first working mode, a second working mode and a third working mode, wherein

The first working mode is a working mode that the first cylinder and the second cylinder respectively carry out primary compression;

the second working mode is a working mode in which the first cylinder performs primary compression and the second cylinder performs secondary compression;

the third working mode is a working mode in which the first cylinder performs primary compression, the second cylinder performs secondary compression and the air supply and enthalpy increase are carried out;

the compressor is provided with a switching mechanism, and the switching mechanism is used for switching the compressor among the first working mode, the second working mode and the third working mode.

2. The compressor of claim 1, wherein the pump body assembly is formed with a first intake port and a second intake port on one side thereof, and a first exhaust port and a supplementary port on the other side thereof, and the housing is provided with a second exhaust port on the top thereof; the first cylinder comprises a first compression cavity and the second cylinder comprises a second compression cavity;

the first air inlet is used for feeding air into the first compression cavity, and the first air outlet is used for discharging air from the first compression cavity; the second air inlet is used for air inlet of the second compression cavity, the second air outlet is used for air exhaust of the second compression cavity, and the air supplementing port is used for supplementing air to the second compression cavity.

3. The compressor of claim 2, wherein the pump body assembly is provided with the second cylinder, a second partition plate, a first partition plate, the first cylinder and a lower flange assembly from top to bottom in sequence;

the first intake port is formed on the first cylinder;

the first exhaust port is formed on the lower flange assembly;

a mixing cavity is formed between the first partition plate and the second partition plate, the second air inlet and the air supplementing port are respectively communicated with the mixing cavity, the mixing cavity is communicated with the second compression cavity, and the second air inlet and the air supplementing port are respectively formed on the first partition plate.

4. The compressor of claim 3, wherein the first inlet port is connected to a first inlet pipe, the second inlet port is connected to a second inlet pipe, the air supplementing port is connected to an air supplementing pipe, the first exhaust port is connected to a first exhaust pipe, the second exhaust port is connected to a second exhaust pipe, and a connecting pipe is arranged between the first exhaust port and the second inlet port;

the switching mechanism switches the compressor among the first working mode, the second working mode and the third working mode by controlling the on-off of the first air inlet pipe, the second air inlet pipe, the first exhaust pipe, the second exhaust pipe, the air supplementing pipe and the connecting pipe.

5. The compressor of claim 4, wherein a first liquid separator is connected between the first inlet pipe and the first inlet port; a second liquid separator is connected between the second air inlet pipe and the second air inlet; and an air supplementing and enthalpy increasing knockout is connected between the air supplementing port and the air supplementing pipe.

6. A compressor according to claim 4 or 5, wherein said switching mechanism comprises:

the first control valve is arranged on the second air inlet pipe;

the second control valve is arranged on the connecting pipe;

the third control valve is arranged on the air supplementing pipe;

and the fourth control valve is arranged on the first exhaust pipe.

7. The compressor of claim 6, wherein the inlet of the connecting pipe is communicated with the first exhaust pipe, and the outlet is communicated with the second intake pipe; the switching mechanism further includes:

a first three-way valve that communicates the second intake pipe with the connection pipe;

a second three-way valve that communicates the first exhaust pipe with the connection pipe;

the first control valve is positioned on the second air inlet pipe between the inlet of the second air inlet pipe and the first three-way valve;

the fourth control valve is located on the first exhaust pipe between the second three-way valve and the outlet of the first exhaust port.

8. A refrigeration system comprising a first heat exchanger, a second heat exchanger, a flash evaporator and the compressor of any one of claims 4 to 7;

the first end of the first heat exchanger is communicated with the first end of the flash evaporator, the second end of the flash evaporator is communicated with the first end of the second heat exchanger, the second end of the second heat exchanger is respectively communicated with the first air inlet pipe and the second air inlet pipe, and the second end of the first heat exchanger is respectively communicated with the first exhaust pipe and the second exhaust pipe; and the third end of the flash evaporator is communicated with the air supplementing pipe.

9. A refrigeration system in accordance with claim 8 further comprising a first throttling valve disposed between the first end of the first heat exchanger and the first end of the flash evaporator and a second throttling valve disposed between the second end of the flash evaporator and the second end of the second heat exchanger.

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