CN107869854B

CN107869854B - Refrigeration system and control method thereof

Info

Publication number: CN107869854B
Application number: CN201610851158.9A
Authority: CN
Inventors: 廖四清; 冯利伟
Original assignee: Guangdong Meizhi Compressor Co Ltd
Current assignee: Guangdong Meizhi Compressor Co Ltd
Priority date: 2016-09-26
Filing date: 2016-09-26
Publication date: 2020-03-13
Anticipated expiration: 2036-09-26
Also published as: CN107869854A

Abstract

The invention discloses a refrigeration system and a control method thereof. The refrigerating system comprises a compressor, a four-way valve, an outdoor heat exchanger, a first throttling device, a flash tank, a second throttling device and an indoor heat exchanger. The main exhaust port is connected with the first valve port, and the first air inlet is connected with the fourth valve port; the first outdoor heat exchange port is connected with the second valve port, and the second exhaust port is selectively communicated with one of the main exhaust port and the second outdoor heat exchange port and is cut off from the other one; the first throttling port is connected with the second outdoor heat exchange port; the second throttling port is connected with the first liquid opening, and the second air suction port is connected with the air outlet; the third throttling port is connected with the second liquid opening; the first indoor heat exchange port is connected with the fourth throttling port, and the second indoor heat exchange port is connected with the third throttling port. According to the refrigeration system provided by the embodiment of the invention, defrosting can be realized without stopping the machine while heating, the defrosting effect is good, the defrosting time is short, and in addition, the heat exchange efficiency and the energy efficiency of the refrigeration system are high.

Description

Refrigeration system and control method thereof

Technical Field

The invention relates to the technical field of refrigeration, in particular to a refrigeration system and a control method thereof.

Background

In the related art, some refrigeration equipment has the function of defrosting without stopping defrosting, but the practical application effect is not good. The main reasons are that: in order to prevent excessive refrigerant from participating in defrosting, a defrosting flow path is controlled by a thin tube or a throttling device to balance pressure, so that the temperature of the defrosting flow path is not high, and the defrosting time is long.

Disclosure of Invention

The present invention is directed to solving, at least to some extent, one of the technical problems in the related art. Therefore, the invention provides a refrigerating system which can realize defrosting without stopping while heating, has good defrosting effect and short defrosting time, and has high heat exchange efficiency and energy efficiency.

The invention also provides a control method of the refrigeration system.

A refrigeration system according to an embodiment of the first aspect of the invention comprises: the compressor comprises a shell and a compression mechanism arranged in the shell, wherein a main exhaust port communicated with an inner cavity of the shell is arranged on the shell, the compression mechanism is provided with a first compression cavity and a second compression cavity which are independent of each other, the first compression cavity is provided with a first air suction port and a first exhaust port, the second compression cavity is provided with a second air suction port and a second exhaust port, and the first exhaust port is communicated with the main exhaust port; the four-way valve is provided with a first valve port, a second valve port, a third valve port and a fourth valve port, the main exhaust port is connected with the first valve port, and the first suction port is connected with the fourth valve port; an outdoor heat exchanger having a first outdoor heat exchange port and a second outdoor heat exchange port, the first outdoor heat exchange port being connected to the second valve port, the second exhaust port being selectively communicated with one of the main exhaust port and the second outdoor heat exchange port and blocked from the other; a first throttling device having a first throttling port and a second throttling port, the first throttling port being connected to the second outdoor heat exchange port; the flash tank is provided with a first liquid opening, a second liquid opening and a gas outlet, the second throttling port is connected with the first liquid opening, and the second air suction port is connected with the gas outlet; a second throttling device having a third throttling port and a fourth throttling port, said third throttling port being connected to said second liquid opening; the indoor heat exchanger is provided with a first indoor heat exchange port and a second indoor heat exchange port, the first indoor heat exchange port is connected with the fourth throttling port, and the second indoor heat exchange port is connected with the third throttling port.

According to the refrigeration system provided by the embodiment of the invention, the second compression chamber is arranged for defrosting the outdoor heat exchanger of the refrigeration system, and the distribution of the flow of the refrigerant does not need to be considered, so that the refrigerant of a defrosting part does not need to be throttled in the process. Therefore, the refrigerant of the defrosting part can be kept at a high temperature, so that a good defrosting effect can be achieved, the defrosting time can be shortened, and the defrosting efficiency can be improved. In addition, when the refrigerating system does not perform defrosting operation, the second compression cavity and the first compression cavity can participate in the refrigerating and heating circulation of the refrigerating system together, so that the energy efficiency of the refrigerating system can be improved.

And the refrigerating system is additionally provided with the flash evaporator, so that the enthalpy value and the suction pressure of the second compression cavity can be improved to a certain extent, a part of compression work is recovered, and meanwhile, the heat exchange efficiency and the energy efficiency of the refrigerating system are improved.

In some preferred embodiments, the refrigeration system further comprises a three-way valve having a fifth port connected to the second exhaust port, a sixth port connected to the second outdoor heat exchange port, and a seventh port in communication with the main exhaust port, wherein the fifth port is selectively in communication with one and blocked from the other of the sixth port and the seventh port.

In some preferred embodiments, the compressor further comprises a muffler disposed in the casing, the muffler has a muffler chamber therein communicating with the inner cavity of the casing, and the first exhaust port and the seventh valve port both communicate with the muffler chamber.

In some preferred embodiments, the refrigeration system further includes a first communication pipe, one end of the first communication pipe is connected to the housing and communicates with the inner cavity of the housing, and the other end of the first communication pipe is connected to the seventh valve port.

In some preferred embodiments, the main exhaust port is connected to the first port through an exhaust pipe, and the seventh port is connected to a second communication pipe, which is communicated with the exhaust pipe.

In some preferred embodiments, the refrigeration system further comprises an on-off valve, and two ends of the on-off valve are respectively connected with the gas outlet of the flash tank and the second suction port; and the two ends of the one-way valve are respectively connected with the first air suction port and the second air suction port, and the one-way valve is configured to be communicated in a one-way mode in the direction from the first air suction port to the second air suction port.

In some preferred embodiments, the volume of the first compression chamber is V1, the volume of the second compression chamber is V2, and the V1 and the V2 satisfy: V2/V1 is more than or equal to 0.05 and less than or equal to 0.5.

According to the control method of the refrigeration system of the embodiment of the second aspect of the invention, the refrigeration system has a refrigeration mode, a heating mode and a heating defrosting mode,

when the refrigeration system is in a refrigeration mode, the second exhaust port is controlled to be communicated with the main exhaust port and cut off from the second outdoor heat exchange port, the first valve port is controlled to be communicated with the second valve port, and the third valve port is controlled to be communicated with the fourth valve port;

when the refrigeration system is in a heating mode, the second exhaust port is controlled to be communicated with the main exhaust port and cut off from the second outdoor heat exchange port, the first valve port is controlled to be communicated with the third valve port, and the second valve port is controlled to be communicated with the fourth valve port;

when the refrigerating system is in a heating defrosting mode, the second exhaust port is controlled to be communicated with the second outdoor heat exchange port and be blocked by the main exhaust port, the first valve port is controlled to be communicated with the third valve port, and the second valve port is controlled to be communicated with the fourth valve port.

According to the control method of the refrigeration system, three different working modes of the refrigeration system can be realized, defrosting can be performed while the refrigeration system heats, the refrigeration system can be conveniently switched to the different working modes, and the use experience of a user is improved.

In some preferred embodiments, the fifth valve port and the seventh valve port are controlled to communicate so that the second exhaust port communicates with the main exhaust port and is blocked from the second outdoor heat exchange port, and the fifth valve port and the sixth valve port are controlled to communicate so that the second exhaust port communicates with the second outdoor heat exchange port and is blocked from the main exhaust port.

In some preferred embodiments, it is detected whether the liquid content in the refrigerant gas discharged from the gas outlet is greater than or equal to an allowable value a to control the on-off valve to open and close:

controlling the on-off valve to be closed when the liquid content in the refrigerant gas discharged from the gas outlet is greater than or equal to the allowable value A,

controlling the on-off valve to open when the liquid content in the refrigerant gas discharged from the gas outlet is less than the allowable value A.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

FIG. 1 is a schematic diagram of a refrigeration system according to one embodiment of the present invention;

FIG. 2 is a schematic diagram of a refrigeration system according to another embodiment of the present invention;

FIG. 3 is a schematic diagram of a refrigeration system according to yet another embodiment of the present invention;

fig. 4 is a schematic diagram of a refrigeration system according to yet another embodiment of the present invention.

Reference numerals

A refrigeration system 100;

a compressor 1; a housing 11; a main exhaust port 111; a motor 12; a first compression chamber 13; a first air intake 131; a second compression chamber 14; a second air inlet 141; a second exhaust port 142; a muffler 15; a reservoir 16;

a four-way valve 2; a first valve port 21; a second valve port 22; a third valve port 23; fourth port 24;

an outdoor heat exchanger 3; a first outdoor heat exchange port 31; a second outdoor heat exchange port 32;

a first throttle device 4; a first throttle port 41; a second throttle port 42;

a flash tank 5; a first liquid opening 51; a second liquid opening 52; a gas outlet 53;

a second throttling device 6; a third throttling port 61; a fourth throttle port 62;

an indoor heat exchanger 7; a first indoor heat exchange port 71; a second indoor heat exchange port 72;

a three-way valve 8; a fifth valve port 81; a sixth valve port 82; a seventh port 83;

a first communication pipe 91; an exhaust 92; a second communication pipe 93;

an on-off valve 101; a one-way valve 102.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the indicated orientations or positional relationships are terms based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the indicated devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus are not to be construed as limiting the present invention. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

A refrigeration system 100 according to an embodiment of the present invention is described below with reference to fig. 1-4.

As shown in fig. 1 to 4, a refrigeration system 100 according to an embodiment of the first aspect of the present invention includes: the system comprises a compressor 1, a four-way valve 2, an outdoor heat exchanger 3, a first throttling device 4, a flash tank 5, a second throttling device 6 and an indoor heat exchanger 7.

Specifically, the compressor 1 comprises a shell 11, a compressor 1 mechanism and a motor 12, wherein the compressor 1 mechanism and the motor 12 are both arranged in the shell 11, and the motor 12 is connected with the compressor 1 mechanism to drive the compressor 1 mechanism to work. The housing 11 is provided with a main discharge port 111 communicating with an inner cavity of the housing 11, and the compressor 1 has a first compression chamber 13 and a second compression chamber 14 independent of each other. The first compression chamber 13 has a first suction port 131 and a first discharge port 92, and a part of refrigerant in the refrigeration system 100 enters the first compression chamber 13 through the first suction port 131, is compressed in the first compression chamber 13, and is discharged from the first discharge port 92. The second compression chamber 14 has a second suction port 141 and a second discharge port 142, and another part of the refrigerant in the refrigeration system 100 enters the second compression chamber 14 through the second suction port 141, is compressed in the second compression chamber 14, and is discharged through the second discharge port 142.

Wherein the first exhaust port 92 communicates with the main exhaust port 111. Specifically, during the suction and compression of the first compression chamber 13, the first exhaust port 92 is disconnected from the main exhaust port 111; when the first discharge port 92 discharges the gas 92, the first discharge port 92 communicates with the main discharge port 111, and the refrigerant discharged from the first compression chamber 13 is discharged from the compressor 1 through the first discharge port 92 and the main discharge port 111.

Alternatively, the compressor 1 may be a rotary compressor 1, a piston compressor 1, a scroll compressor 1, or the like.

For example, when the compressor 1 is a rotary compressor 1, the compressor 1 may be a double-cylinder compressor 1 or a single-cylinder double-sliding-vane compressor 1. Specifically, when the compressor 1 is a two-cylinder compressor 1, the compressor 1 includes two cylinders, which may be separated by a partition plate, and each of the two cylinders has a first compression chamber 13 and a second compression chamber 14. The compressor 1 is a single-cylinder double-sliding-vane compressor 1, the compressor 1 comprises an air cylinder, and two sliding vanes are arranged on the air cylinder to divide an inner cavity of the air cylinder into a first compression cavity 13 and a second compression cavity 14 which are independent of each other.

The four-way valve 2 has a first port 21, a second port 22, a third port 23, and a fourth port 24, and the main exhaust port 111 is connected to the first port 21, and the first intake port 131 is connected to the fourth port 24.

Refrigeration system 100 may further include accumulator 16, with one end of accumulator 16 connected to fourth port 24 and the other end of accumulator 16 connected to first suction port 131. Refrigerant circulating in the refrigeration system 100 is filtered and gas-liquid separated by the accumulator 16, and then enters the first compression chamber 13 from the first suction port 131 to be compressed. Thereby, the liquid hammering phenomenon of the first compression chamber 13 can be prevented.

The outdoor heat exchanger 3 has a first outdoor heat exchange port 31 and a second outdoor heat exchange port 32, the first outdoor heat exchange port 31 is connected to the second valve port 22, and the second discharge port 142 is selectively communicated with one of the main discharge port 111 and the second outdoor heat exchange port 32 and blocked from the other. Thus, when the second discharge port 142 communicates with the main discharge port 111 and is blocked from the second outdoor heat exchange port 32, the refrigerant discharged from the second discharge port 142 is merged with the refrigerant discharged from the main discharge port 111, so that the second compression chamber 14 may participate in a cooling or heating cycle of the refrigeration system 100; when the second discharge port 142 communicates with the second outdoor heat exchange port 32 and is blocked from the main discharge port 111, the refrigerant discharged from the second discharge port 142 flows into the outdoor heat exchanger 3 through the second outdoor heat exchange port 32, so that the high-temperature refrigerant gas discharged through the second compression chamber 14 can defrost the outdoor heat exchanger 3.

The first throttling device 4 is provided with a first throttling port 41 and a second throttling port 42, the first throttling port 41 is connected with the second outdoor heat exchange port 32, and the first throttling device 4 has the functions of throttling and reducing pressure.

The flash tank 5 has a first liquid opening 51, a second liquid opening 52, and a gas outlet 53, the second throttle port 42 being connected to the first liquid opening 51, and the second suction port 141 being connected to the gas outlet 53. Wherein the first liquid opening 51 and the second liquid opening 52 are both arranged at the lower part of the flash vessel 5, and the gas outlet 53 is arranged at the upper part of the flash vessel 5. The refrigerant liquid in the flash evaporator 5 is stored at the bottom, the flashed gas is arranged at the top, and the flashed gas is connected to the second suction port 141 and can enter the second compression cavity 14, so that the enthalpy and suction pressure of the second compression cavity 14 can be improved to a certain extent, a part of compression work is recovered, and meanwhile, the heat exchange efficiency and energy efficiency of the refrigeration system 100 are improved.

The second throttle 6 has a third throttle port 61 and a fourth throttle port 62, the third throttle port 61 being connected to the second liquid opening 52. Thus, throttling devices are arranged at the front and the rear of the flash evaporator 5, so that when the refrigeration system 100 is in a refrigeration cycle, the refrigerant liquid flowing out of the second liquid opening 52 of the flash evaporator 5 can flow to the indoor heat exchanger 7 after being throttled again by the second throttling device 6, and the pressure and the temperature of the refrigerant liquid can be further reduced; when the refrigeration system 100 is in a heating cycle, the refrigerant liquid flowing out of the first liquid opening 51 of the flash tank 5 can be throttled again by the first throttling device 4 and then flow to the indoor heat exchanger 7, and the pressure and temperature of the refrigerant liquid can be further reduced. The heat exchange effect of the system is better.

The indoor heat exchanger 7 has a first indoor heat exchange port 71 and a second indoor heat exchange port 72, the first indoor heat exchange port 71 being connected to the fourth throttle port 62, the second indoor heat exchange port 72 being connected to the third valve port 23.

The operation of the refrigeration system 100 of the present invention will be described in detail below. First, the refrigeration system 100 according to the embodiment of the present invention has a cooling mode, a heating mode, and a heating defrosting mode.

When the refrigeration system 100 is in the refrigeration mode, the first port 21 is communicated with the second port 22, the third port 23 is communicated with the fourth port 24, and the second exhaust port 142 is communicated with the main exhaust port 111 and blocked from the second outdoor heat exchange port 32. Specifically, a part of the refrigerant circulating in the refrigeration system 100 enters the first compression chamber 13 through the first suction port 131 and another part of the refrigerant enters the second compression chamber 14 through the second suction port 141, the refrigerant in the first compression chamber 13 is compressed and then discharged out of the compressor 1 through the first discharge port 92 and the main discharge port 111 in sequence, and the refrigerant in the second compression chamber 14 is compressed and then discharged through the second discharge port 142 and then joins the refrigerant gas discharged from the main discharge port 111, thereby participating in the subsequent cycle. The refrigerant discharged from the compressor 1 sequentially flows through the first valve port 21 and the second valve port 22 of the four-way valve 2, flows into the outdoor heat exchanger 3 through the first outdoor heat exchange port 31 of the outdoor heat exchanger 3, condenses and releases heat in the outdoor heat exchanger 3, flows out of the outdoor heat exchanger 3 through the second outdoor heat exchange port 32 of the outdoor heat exchanger 3, is throttled and depressurized through the first throttling device 4, then enters the flash tank 5 through the first liquid opening 51 for flash vaporization, flows out of the flash tank 5 through the second liquid opening 52 for depressurization through the second throttling device 6, flows into the indoor heat exchanger 7 from the first indoor heat exchange port 71 of the indoor heat exchanger 7, evaporates and absorbs heat in the indoor heat exchanger 7, so that the indoor air can be cooled, and then flows out through the second indoor heat exchange port 72 of the indoor heat exchanger 7, sequentially flows through a third valve port 23 and a fourth valve port 24 of the four-way valve 2, and finally flows back to the first compression cavity 13 through the first air inlet 131 to be compressed; the refrigerant in the gaseous state discharged from the gas outlet 53 of the flash tank 5 enters the second compression chamber 14 through the second suction port 141 and is compressed. And the process is circulated.

When the refrigeration system 100 is in the heating mode, the first port 21 is communicated with the third port 23, the second port 22 is communicated with the fourth port 24, and the second exhaust port 142 is communicated with the main exhaust port 111 and blocked from the second outdoor heat exchange port 32. Specifically, a part of the refrigerant circulating in the refrigeration system 100 enters the first compression chamber 13 through the first suction port 131 and another part of the refrigerant enters the second compression chamber 14 through the second suction port 141, the refrigerant in the first compression chamber 13 is compressed and then discharged out of the compressor 1 through the first discharge port 92 and the main discharge port 111 in sequence, and the refrigerant in the second compression chamber 14 is compressed and then discharged through the second discharge port 142 and then joins the refrigerant gas discharged from the main discharge port 111, thereby participating in the subsequent cycle. The refrigerant gas discharged from the compressor 1 sequentially passes through the first valve port 21 and the third valve port 23 of the four-way valve 2, and flows into the indoor heat exchanger 7 through the second indoor heat exchange port 72 of the indoor heat exchanger 7, and the refrigerant condenses and releases heat in the indoor heat exchanger 7, thereby increasing the temperature of indoor air. Then, the refrigerant flows out of the indoor heat exchanger 7 through the first indoor heat exchange port 71 of the indoor heat exchanger 7, and is throttled and depressurized by the second throttling device 6. The refrigerant throttled and depressurized by the first throttling device 4 enters the flash tank 5 through the second liquid opening 52 for flash vaporization, the liquid refrigerant flows out of the flash tank 5 through the first liquid opening 51, is depressurized by the first throttling device 4, flows into the outdoor heat exchanger 3 from the second outdoor heat exchange port 32 of the outdoor heat exchanger 3, evaporates and absorbs heat in the outdoor heat exchanger 3, flows out through the first indoor heat exchange port 71 of the outdoor heat exchanger 3, sequentially flows through the second valve port 22 and the fourth valve port 24 of the four-way valve 2, and finally flows back into the first compression cavity 13 through the first air absorption port 131 for compression; the refrigerant in the gaseous state discharged from the gas outlet 53 of the flash tank 5 enters the second compression chamber 14 through the second suction port 141 and is compressed. And the process is circulated.

When the refrigeration system 100 is in the defrosting heating mode, the first port 21 is communicated with the third port 23, the second port 22 is communicated with the fourth port 24, and the second exhaust port 142 is communicated with the second outdoor heat exchange port 32 and blocked from the main exhaust port 111.

Specifically, a part of the refrigerant circulating in the refrigeration system 100 enters the first compression chamber 13 through the first suction port 131 and another part of the refrigerant enters the second compression chamber 14 through the second suction port 141. The refrigerant in the first compression cavity 13 is compressed and then discharged to the main exhaust port 111 through the first exhaust port 92, the refrigerant is discharged from the compressor 1 through the main exhaust port 111, sequentially flows through the first valve port 21 and the third valve port 23 of the four-way valve 2, the indoor heat exchanger 7, the first throttling device 4, the flash tank 5, the second throttling device 6, the outdoor heat exchanger 3, the second valve port 22 and the fourth valve port 24 of the four-way valve 2, and finally flows back to the first compression cavity 13 through the first air intake 131 for compression; the refrigerant discharged from the gas outlet 53 of the flash tank 5 enters the second compression chamber 14 through the second suction port 141 and is compressed. Thereby forming a loop. This cycle is a circulation flow path in which the refrigeration system 100 performs a heating operation.

When the refrigeration system 100 performs heating operation, defrosting operation can be performed on the outdoor heat exchanger 3 at the same time without stopping the operation. The refrigerant introduced into the second compression chamber 14 is compressed and discharged to the second outdoor heat exchange port 32 of the outdoor heat exchanger 3 through the second discharge port 142. At this time, the high-temperature refrigerant gas flows into the outdoor heat exchanger 3 through the second outdoor heat exchange port 32 to defrost the outdoor heat exchanger 3, and then the refrigerant flows out through the first outdoor heat exchange port 31 of the outdoor heat exchanger 3, sequentially flows through the second valve port 22 and the fourth valve port 24 of the four-way valve 2, and finally flows back into the first compression chamber 13 through the first suction port 131 to be compressed, thereby forming a cycle. This cycle is a cycle flow path in which the refrigeration system 100 performs defrosting operation.

As can be seen from the above description, the refrigeration system 100 according to the embodiment of the present invention performs the defrosting operation for the outdoor heat exchanger 3 of the refrigeration system 100 by providing the second compression chamber 14, and there is no need to consider the distribution of the refrigerant flow, so that the throttling of the refrigerant in the defrosting portion is not required in the process. Therefore, the refrigerant of the defrosting part can be kept at a high temperature, so that a good defrosting effect can be achieved, the defrosting time can be shortened, and the defrosting efficiency can be improved. In addition, when the refrigeration system 100 does not perform the defrosting operation, the second compression chamber 14 may participate in the cooling and heating cycles of the refrigeration system 100 together with the first compression chamber 13, so that the energy efficiency of the refrigeration system 100 may be improved.

In addition, the refrigeration system 100 is added with the flash evaporator 5, so that the enthalpy and the suction pressure of the second compression cavity 14 can be improved to a certain extent, a part of compression work can be recovered, and meanwhile, the heat exchange efficiency and the energy efficiency of the refrigeration system 100 can also be improved.

The average heating capacity of the refrigeration system 100 according to the embodiment of the invention is high, and compared with the traditional refrigeration system 100 without defrosting, the average heating capacity of the refrigeration system 100 can be improved by more than 10%.

It should be noted that the ratio of the volume of the second compression chamber 14 to the volume of the first compression chamber 13 may be determined according to actual conditions. In the event that the refrigerant system 100 is heavily frosted, the volume of the second compression chamber 14 may be set to be larger. For example, the volume of the first compression chamber 13 is V1, and the volume of the second compression chamber 14 is V2, where V1 and V2 may satisfy: V2/V1 is more than or equal to 0.05 and less than or equal to 0.5. Therefore, on the premise that the refrigeration system 100 wants to meet different working condition requirements, the refrigeration or heating efficiency is not reduced.

According to the refrigeration system 100 of the embodiment of the invention, the first compression chamber 13 and the second compression chamber 14 which are independent from each other are arranged in the compressor 1, and the second exhaust port 142 of the second compression chamber 14 is selectively communicated with one of the main exhaust port 111 and the second outdoor heat exchange port 32 and is blocked from the other, so that the refrigeration system 100 can defrost while heating, and the defrosting effect is good, the defrosting time is short, and the average heating capacity is high.

In addition, by providing the flash evaporator 5, the enthalpy and the suction pressure of the second compression chamber 14 can be increased to a certain extent, a part of compression work can be recovered, and the heat exchange efficiency and the energy efficiency of the refrigeration system 100 can be improved.

A refrigeration system 100 according to various embodiments of the present invention is described in detail below with reference to fig. 1-4.

The first embodiment is as follows:

referring to fig. 1, in the present embodiment, a refrigeration system 100 includes the above-described compressor 1, a four-way valve 2, an outdoor heat exchanger 3, a first throttling device 4, a flash tank 5, a second throttling device 6, and an indoor heat exchanger 7.

In this embodiment, the refrigeration system 100 further includes a three-way valve 8, the three-way valve 8 has a fifth port 81, a sixth port 82 and a seventh port 83, the fifth port 81 is connected to the second exhaust port 142, the sixth port 82 is connected to the second outdoor heat exchanging port 32, and the seventh port 83 is connected to the main exhaust port 111, wherein the fifth port 81 is selectively connected to one of the sixth port 82 and the seventh port 83 and blocked from the other. Thus, when the fifth port 81 communicates with the sixth port 82 and is blocked from the seventh port 83, the second exhaust port 142 communicates with the second outdoor heat exchange port 32 and is blocked from the main exhaust port 111; when the fifth port 81 communicates with the seventh port 83 and is blocked from the sixth port 82, the second exhaust port 142 communicates with the main exhaust port 111 and is blocked from the second outdoor heat exchange port 32. Thus, by setting the three-way valve 8, the communication and the interception of the second discharge port 142 with the main discharge port 111 and the second outdoor heat exchange port 32, respectively, can be more conveniently controlled, thereby making the structure of the refrigeration system 100 simple and convenient to control. Alternatively, the three-way valve 8 may be a three-way valve 8 made by sealing one port of a four-way valve.

Optionally, the compressor 1 further includes a muffler 15 disposed in the casing 11, the muffler 15 has a muffler chamber therein, the muffler chamber is communicated with the inner cavity of the casing 11, and the first exhaust port 92 and the seventh valve port 83 can be communicated with the muffler chamber. Thus, the refrigerant discharged from the first discharge port 92 can flow into the muffler chamber, so that the noise of the discharge port 92 of the first discharge port 92 can be reduced by the muffler 15, and the refrigerant is reduced in noise by the muffler 15 and discharged out of the compressor 1 through the main discharge port 111. When the fifth valve port 81 is communicated with the seventh valve port 83, the refrigerant discharged from the second exhaust port 142 flows into the muffler chamber through the fifth valve port 81 and the seventh valve port 83 in sequence, so that the noise of the exhaust 92 of the second exhaust port 142 can be reduced by the muffler 15, and the refrigerant flows into the inner chamber of the shell 11 of the compressor 1 after being reduced in noise by the muffler 15, and then is communicated with the main exhaust port 111, so as to be discharged out of the compressor 1 together.

Example two:

the embodiment shown in fig. 2 is different from the embodiment shown in fig. 1 in that, with respect to the description of the embodiment of the refrigeration system 100, the refrigeration system 100 further includes an on-off valve 101 and a check valve 102, both ends of the on-off valve 101 are respectively connected to the gas outlet 53 of the flash tank 5 and the second suction port 141, both ends of the check valve 102 are respectively connected to the first suction port 131 and the second suction port 141, and the check valve 102 is configured to be communicated in one direction from the first suction port 131 toward the second suction port 141.

It should be noted that, the refrigerant gas discharged from the gas outlet 53 of the flash tank 5 inevitably carries a part of liquid refrigerant in its interior at some times, and when the part of liquid refrigerant does not exceed a certain range, the influence on the compressor 1 is not great, but when the part of liquid refrigerant exceeds a certain range, the liquid refrigerant enters into the compression cavity to cause the liquid slugging phenomenon of the compressor 1, thereby affecting the service life of the compressor 1.

Therefore, in the present embodiment, by providing the on-off valve 101, it is possible to avoid adverse effects on the compressor 1 when a liquid portion is mixed in the refrigerant discharged from the gas outlet 53. That is, when the liquid portion is mixed in the refrigerant discharged from the gas outlet 53, the on-off valve 101 is controlled to be closed, thereby blocking the passage between the gas outlet 53 and the second suction port 141.

Further, the check valve 102 is installed to be opened in one direction from the first suction port 131 toward the second suction port 141, so that when the valve 101 is opened, since the pressure at the first suction port 131 is higher than the pressure at the second suction port 141, a part of the refrigerant flowing to the first suction port 131 can flow to the second suction port 141 through the check valve 102, thereby preventing the second compression chamber 14 from being vacuumed.

Of course, when the on-off valve 101 is opened, since the pressure of the gaseous refrigerant discharged from the gas outlet 53 of the flash evaporator is higher than the pressure of the refrigerant introduced into the first suction port 131, the check valve 102 is reversely closed, and the refrigerant does not flow from the gas outlet 53 to the first suction port 131, thereby stabilizing the flow direction of the refrigerant in the refrigeration system 100.

Further, in the present embodiment, the three-way valve 8 and the muffler 15 are still included, as in the above-described embodiment. The structure and connection of the three-way valve 8 are the same as those of the embodiment shown in fig. 1, and the structure and connection of the muffler 15 are the same as those of the above-described embodiment, and will not be described in detail.

Example three:

as shown in fig. 3, the refrigeration system 100 of the present embodiment differs from the embodiment shown in fig. 2 in that: a three-way valve 8 is also included in this embodiment, but the connection of the three-way valve 8 is different from the embodiment shown in fig. 2.

Specifically, in the present refrigeration system 100, the muffler 15 may be eliminated from the inside of the compressor 1, and the first communication pipe 91 may be added.

The three-way valve 8 has a fifth valve port 81, a sixth valve port 82 and a seventh valve port 83, the fifth valve port 81 is connected to the second exhaust port 142, the sixth valve port 82 is connected to the second outdoor heat exchange port 32, the seventh valve port 83 is directly communicated with the inner cavity of the casing 11 of the compressor 1 through a first communication pipe 91, that is, one end of the first communication pipe 91 is connected to the casing 11 and is communicated with the inner cavity of the casing 11, and the other end of the first communication pipe 91 is connected to the seventh valve port 83.

Wherein the fifth port 81 is selectively communicated with one of the sixth port 82 and the seventh port 83 and blocked from the other. Thus, when the fifth port 81 communicates with the sixth port 82 and is blocked from the seventh port 83, the second exhaust port 142 communicates with the second outdoor heat exchange port 32 and is blocked from the main exhaust port 111; when the fifth port 81 communicates with the seventh port 83 and is blocked from the sixth port 82, the second exhaust port 142 communicates with the main exhaust port 111 and is blocked from the second outdoor heat exchange port 32, and specifically, when the fifth port 81 communicates with the seventh port 83, the refrigerant discharged from the second exhaust port 142 flows into the inner cavity of the casing 11 through the fifth port 81, the seventh port 83, and the first communication pipe 91 in this order, and is then discharged out of the compressor 1 through the main exhaust port 111. That is, the seventh port 83 communicates with the main exhaust port 111 through the inner cavity of the housing 11, so that the communication between the seventh port 83 and the main exhaust port 111 can be facilitated.

By setting the three-way valve 8, the communication and the interception of the second discharge port 142 with the main discharge port 111 and the second outdoor heat exchange port 32, respectively, can be more conveniently controlled, thereby making the structure of the refrigeration system 100 simple and convenient to control. Alternatively, the three-way valve 8 may be a three-way valve 8 made by sealing one port of a four-way valve.

Example four:

referring to fig. 4, the embodiment further includes a three-way valve 8, which is different from the embodiment shown in fig. 3, but the connection manner of the three-way valve 8 is different from the embodiment shown in fig. 3.

Specifically, in the present embodiment, the first communication pipe 91 is eliminated, and the second communication pipe 93 and the exhaust pipe 92 are added.

The main exhaust port 111 is connected to the first port 21 through an exhaust 92 pipe, the three-way valve 8 has a fifth port 81, a sixth port 82, and a seventh port 83, the fifth port 81 is connected to the second exhaust port 142, the sixth port 82 is connected to the second outdoor heat exchange port 32, the seventh port 83 is connected to the exhaust 92 pipe through a second communication pipe 93, that is, one end of the second communication pipe 93 is connected to the seventh port 83, and the other end of the second communication pipe 93 is connected to the exhaust 92 pipe.

Wherein the fifth port 81 is selectively communicated with one of the sixth port 82 and the seventh port 83 and blocked from the other. Thus, when the fifth port 81 communicates with the sixth port 82 and is blocked from the seventh port 83, the second exhaust port 142 communicates with the second outdoor heat exchange port 32 and is blocked from the main exhaust port 111; when the fifth port 81 is communicated with the seventh port 83 and blocked from the sixth port 82, the second exhaust port 142 is communicated with the main exhaust port 111 and blocked from the second outdoor heat exchange port 32, specifically, when the fifth port 81 is communicated with the seventh port 83, the refrigerant discharged from the second exhaust port 142 is mixed with the refrigerant discharged from the main exhaust port 111, and further, the refrigerants discharged from the first compression chamber 13 and the second compression chamber 14 can participate in both the refrigeration cycle and the heating cycle of the refrigeration system 100.

That is, the seventh port 83 is connected to the exhaust port 92 via the second connection pipe 93, and another type of structure is formed in which the seventh port 83 communicates with the main exhaust port 111.

A control method of the refrigeration system 100 according to the second aspect of the present invention will be described below, where the refrigeration system 100 is the refrigeration system 100 of the first aspect of the present invention. Wherein the refrigeration system 100 has a cooling mode, a heating mode, and a heating defrosting mode.

When the refrigeration system 100 is in the refrigeration mode, the second exhaust port 142 is controlled to be communicated with the main exhaust port 111 and blocked from the second outdoor heat exchange port 32, the first valve port 21 is communicated with the second valve port 22, and the third valve port 23 is communicated with the fourth valve port 24.

Specifically, a part of the refrigerant circulating in the refrigeration system 100 enters the first compression chamber 13 through the first suction port 131 and another part of the refrigerant enters the second compression chamber 14 through the second suction port 141, the refrigerant in the first compression chamber 13 is compressed and then discharged out of the compressor 1 through the first discharge port 92 and the main discharge port 111 in sequence, and the refrigerant in the second compression chamber 14 is compressed and then discharged through the second discharge port 142 and then joins the refrigerant gas discharged from the main discharge port 111, thereby participating in the subsequent cycle. The refrigerant discharged from the compressor 1 sequentially flows through the first valve port 21 and the second valve port 22 of the four-way valve 2, flows into the outdoor heat exchanger 3 through the first outdoor heat exchange port 31 of the outdoor heat exchanger 3, condenses and releases heat in the outdoor heat exchanger 3, flows out of the outdoor heat exchanger 3 through the second outdoor heat exchange port 32 of the outdoor heat exchanger 3, is throttled and depressurized through the first throttling device 4, then enters the flash tank 5 through the first liquid opening 51 for flash vaporization, flows out of the flash tank 5 through the second liquid opening 52 for depressurization through the second throttling device 6, flows into the indoor heat exchanger 7 from the first indoor heat exchange port 71 of the indoor heat exchanger 7, evaporates and absorbs heat in the indoor heat exchanger 7, so that the indoor air can be cooled, and then flows out through the second indoor heat exchange port 72 of the indoor heat exchanger 7, sequentially flows through a third valve port 23 and a fourth valve port 24 of the four-way valve 2, and finally flows back to the first compression cavity 13 through the first air inlet 131 to be compressed; the refrigerant in the gaseous state discharged from the gas outlet 53 of the flash tank 5 enters the second compression chamber 14 through the second suction port 141 and is compressed. And the process is circulated.

When the refrigeration system 100 is in the heating mode, the second exhaust port 142 is controlled to be communicated with the main exhaust port 111 and blocked from the second outdoor heat exchange port 32, the first port 21 is communicated with the third port 23, and the second port 22 is communicated with the fourth port 24.

Specifically, a part of the refrigerant circulating in the refrigeration system 100 enters the first compression chamber 13 through the first suction port 131 and another part of the refrigerant enters the second compression chamber 14 through the second suction port 141, the refrigerant in the first compression chamber 13 is compressed and then discharged out of the compressor 1 through the first discharge port 92 and the main discharge port 111 in sequence, and the refrigerant in the second compression chamber 14 is compressed and then discharged through the second discharge port 142 and then joins the refrigerant gas discharged from the main discharge port 111, thereby participating in the subsequent cycle. The refrigerant gas discharged from the compressor 1 sequentially passes through the first valve port 21 and the third valve port 23 of the four-way valve 2, and flows into the indoor heat exchanger 7 through the second indoor heat exchange port 72 of the indoor heat exchanger 7, and the refrigerant condenses and releases heat in the indoor heat exchanger 7, thereby increasing the temperature of indoor air. Then, the refrigerant flows out of the indoor heat exchanger 7 through the first indoor heat exchange port 71 of the indoor heat exchanger 7, and is throttled and depressurized by the second throttling device 6. The refrigerant throttled and depressurized by the first throttling device 4 enters the flash tank 5 through the second liquid opening 52 for flash vaporization, the liquid refrigerant flows out of the flash tank 5 through the first liquid opening 51, is depressurized by the first throttling device 4, flows into the outdoor heat exchanger 3 from the second outdoor heat exchange port 32 of the outdoor heat exchanger 3, evaporates and absorbs heat in the outdoor heat exchanger 3, flows out through the first indoor heat exchange port 71 of the outdoor heat exchanger 3, sequentially flows through the second valve port 22 and the fourth valve port 24 of the four-way valve 2, and finally flows back into the first compression cavity 13 through the first air absorption port 131 for compression; the refrigerant in the gaseous state discharged from the gas outlet 53 of the flash tank 5 enters the second compression chamber 14 through the second suction port 141 and is compressed. And the process is circulated.

When the refrigeration system 100 is in the heating and defrosting mode, the second exhaust port 142 is controlled to be communicated with the second outdoor heat exchanging port 32 and blocked from the main exhaust port 111, the first valve port 21 is communicated with the third valve port 23, and the second valve port 22 is communicated with the fourth valve port 24.

According to the control method of the refrigeration system 100 provided by the embodiment of the invention, three different working modes of the refrigeration system 100 can be realized, defrosting can be performed while the refrigeration system 100 heats, the refrigeration system 100 can be conveniently switched to different working modes, and the use experience of a user is improved.

In some embodiments of the present invention, referring to fig. 1-4, the refrigeration system 100 includes the three-way valve 8 described above. At this time, the fifth port 81 and the seventh port 83 are controlled to communicate, so that the second exhaust port 142 communicates with the main exhaust port 111 and is blocked from the second outdoor heat exchange port 32, and the fifth port 81 and the sixth port 82 are controlled to communicate, so that the second exhaust port 142 communicates with the second outdoor heat exchange port 32 and is blocked from the inner cavity of the housing 11. Thus, control is facilitated, and switching of the refrigeration system 100 between different operating modes can be achieved.

In some embodiments of the present invention, referring to fig. 2-4, the refrigeration system 100 includes the on-off valve 101 and the check valve 102 described above. Specifically, the control method further includes the steps of: it is detected whether the liquid content in the refrigerant gas discharged from the gas outlet 53 is greater than or equal to the allowable value a to control the on-off valve 101 to open and close:

when the liquid content in the refrigerant gas discharged from the gas outlet 53 is greater than or equal to the allowable value a, the on-off valve 101 is controlled to be closed, so that the on-off valve 101 cuts off the passage between the flash tank 5 and the second suction port 141, and the liquid refrigerant in the flash tank 5 can be prevented from flowing to the second compression chamber 14 to cause liquid slugging damage. Wherein the refrigerant in the second compression chamber 14 flows from one portion to the first compression chamber 13.

When the liquid content in the refrigerant gas discharged from the gas outlet 53 is less than the allowable value a, the on-off valve 101 is controlled to be opened, whereby the refrigerant gas flashed from the flash evaporator can be directly introduced into the second compression chamber 14 to be compressed, whereby a part of the compression work can be recovered, whereby the energy efficiency of the refrigeration system 100 can be improved. The check valve 102 is now in a check state.

In summary, the refrigeration system 100 according to the embodiment of the present invention performs the defrosting operation for the outdoor heat exchanger 3 of the refrigeration system 100 by providing the second compression chamber 14, and there is no need to consider the distribution of the refrigerant flow, so that the throttling of the refrigerant in the defrosting operation is not required in the process. Therefore, the refrigerant of the defrosting part can be kept at a high temperature, so that a good defrosting effect can be achieved, the defrosting time can be shortened, and the defrosting efficiency can be improved. In addition, when the refrigeration system 100 does not perform the defrosting operation, the second compression chamber 14 may participate in the cooling and heating cycles of the refrigeration system 100 together with the first compression chamber 13, so that the energy efficiency of the refrigeration system 100 may be improved. In addition, the refrigeration system 100 is added with the flash evaporator 5, so that the enthalpy and the suction pressure of the second compression cavity 14 can be improved to a certain extent, a part of compression work can be recovered, and meanwhile, the heat exchange efficiency and the energy efficiency of the refrigeration system 100 can also be improved. The average heating capacity of the refrigeration system 100 according to the embodiment of the invention is high, and compared with the traditional refrigeration system 100 without defrosting, the average heating capacity of the refrigeration system 100 can be improved by more than 10%.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A refrigeration system, comprising:

the compressor comprises a shell and a compression mechanism arranged in the shell, wherein a main exhaust port communicated with an inner cavity of the shell is arranged on the shell, the compression mechanism is provided with a first compression cavity and a second compression cavity which are independent of each other, the first compression cavity is provided with a first air suction port and a first exhaust port, the second compression cavity is provided with a second air suction port and a second exhaust port, and the first exhaust port is communicated with the main exhaust port;

the four-way valve is provided with a first valve port, a second valve port, a third valve port and a fourth valve port, the main exhaust port is connected with the first valve port, and the first suction port is connected with the fourth valve port;

an outdoor heat exchanger having a first outdoor heat exchange port and a second outdoor heat exchange port, the first outdoor heat exchange port being connected to the second valve port, the second exhaust port being selectively communicated with one of the main exhaust port and the second outdoor heat exchange port and blocked from the other;

a first throttling device having a first throttling port and a second throttling port, the first throttling port being connected to the second outdoor heat exchange port;

the flash tank is provided with a first liquid opening, a second liquid opening and a gas outlet, the second throttling port is connected with the first liquid opening, and the second air suction port is connected with the gas outlet;

a second throttling device having a third throttling port and a fourth throttling port, said third throttling port being connected to said second liquid opening;

the indoor heat exchanger is provided with a first indoor heat exchange port and a second indoor heat exchange port, the first indoor heat exchange port is connected with the fourth throttling port, and the second indoor heat exchange port is connected with the third throttling port.

2. The refrigerant system as set forth in claim 1, further comprising a three-way valve having a fifth port connected to said second exhaust port, a sixth port connected to said second outdoor heat exchange port, and a seventh port in communication with said main exhaust port, wherein said fifth port is selectively in communication with one of said sixth port and said seventh port and blocked from the other.

3. The refrigerant system as set forth in claim 2, wherein said compressor further includes a muffler disposed within said housing, said muffler having a muffler chamber therein communicating with the interior chamber of said housing, said first exhaust port and said seventh valve port both communicating with said muffler chamber.

4. The refrigeration system as claimed in claim 2, further comprising a first communication pipe having one end connected to the housing and communicating with the inner cavity of the housing, and the other end connected to the seventh port.

5. The refrigeration system as recited in claim 2 wherein the main exhaust port is connected to the first port through an exhaust pipe, and the seventh port is connected to a second communication pipe, the second communication pipe being in communication with the exhaust pipe.

6. The refrigerant system as set forth in claim 1, further including:

the two ends of the on-off valve are respectively connected with the gas outlet of the flash tank and the second air suction port;

and the two ends of the one-way valve are respectively connected with the first air suction port and the second air suction port, and the one-way valve is configured to be communicated in a one-way mode in the direction from the first air suction port to the second air suction port.

7. The refrigeration system as claimed in any one of claims 1 to 6, wherein the volume of the first compression chamber is V1, the volume of the second compression chamber is V2, and the V1 and the V2 satisfy: V2/V1 is more than or equal to 0.05 and less than or equal to 0.5.

8. A control method for a refrigeration system according to any one of claims 1 to 7, wherein the refrigeration system has a cooling mode, a heating mode, and a heating defrosting mode,

9. The control method as set forth in claim 8, wherein the refrigeration system is a refrigeration system as set forth in any one of claims 2 to 5, the fifth port and the seventh port are controlled to communicate so that the second exhaust port communicates with the main exhaust port and is blocked from the second outdoor heat exchange port, and the fifth port and the sixth port are controlled to communicate so that the second exhaust port communicates with the second outdoor heat exchange port and is blocked from the main exhaust port.

10. The control method according to claim 8, wherein the refrigeration system is the refrigeration system according to claim 6,

detecting whether the liquid content in the refrigerant gas discharged from the gas outlet is greater than or equal to an allowable value A to control the on-off valve to open and close: