CN116697646A

CN116697646A - Refrigerating system and refrigerator

Info

Publication number: CN116697646A
Application number: CN202210179189.XA
Authority: CN
Inventors: 赵向辉; 孙守军; 孙永升; 刘煜森; 陶瑞涛
Original assignee: Qingdao Haier Smart Technology R&D Co Ltd; Haier Smart Home Co Ltd
Current assignee: Qingdao Haier Smart Technology R&D Co Ltd; Haier Smart Home Co Ltd
Priority date: 2022-02-25
Filing date: 2022-02-25
Publication date: 2023-09-05

Abstract

The invention belongs to the technical field of refrigeration, and particularly provides a refrigeration system and a refrigerator. The invention aims to solve the problem that the existing refrigeration system has poor capacity of adjusting the refrigeration capacity by adjusting the operation frequency of a compressor. The refrigerating system comprises a compressor, a condenser, a gas-liquid separator, a depressurization branch, a first evaporator, a first control valve and a low-temperature refrigerant storage, wherein the outlet of the compressor is in fluid connection with the inlet of the condenser; the gas phase outlet of the gas-liquid separator is in fluid connection with the inlet of the low-temperature refrigerant storage through a first control valve. The invention improves the refrigerating capacity adjusting capability of the refrigerating system.

Description

Refrigerating system and refrigerator

Technical Field

The invention belongs to the technical field of refrigeration, and particularly provides a refrigeration system and a refrigerator.

Background

With the improvement of the living standard of people, refrigerators have been put into thousands of households and become an indispensable part of the lives of people. In order to meet different refrigeration demands of users, the refrigerator needs to adjust the operation condition of the refrigeration system in the refrigerator according to the change of external load (such as ambient temperature, weight and the like of food materials in a stored room).

The existing refrigerator generally realizes the adjustment of the refrigerating capacity of a refrigerating system by changing the operating frequency (rotating speed) of a compressor. However, the rotation speed adjusting range of the compressor is limited, so that the refrigerating capacity adjusting capability of the refrigerating system is limited, and the actual requirement of a user cannot be met.

Disclosure of Invention

An object of the present invention is to solve the problem that the existing refrigeration system has poor capacity of adjusting the refrigerating capacity by adjusting the operating frequency of the compressor.

In order to achieve the above object, the present invention provides a refrigeration system, in which a first refrigerant and a second refrigerant are filled, the boiling temperature of the first refrigerant is lower than the boiling temperature of the second refrigerant, the refrigeration system includes a compressor, a condenser, a gas-liquid separator, a depressurization branch, a first evaporator, a first control valve and a low-temperature refrigerant storage, the outlet of the compressor is fluidly connected with the inlet of the condenser, the outlet of the condenser is fluidly connected with the inlet of the gas-liquid separator, the liquid phase outlet of the gas-liquid separator is fluidly connected with the inlet of the depressurization branch, the outlet of the depressurization branch is fluidly connected with the inlet of the first evaporator, and the outlet of the first evaporator is fluidly connected with the inlet of the compressor; the gas phase outlet of the gas-liquid separator is in fluid connection with the inlet of the low-temperature refrigerant storage through the first control valve; the first control valve is used for controlling whether the gas-liquid separator is communicated with the low-temperature refrigerant storage or not; the low-temperature refrigerant storage is used for storing the first refrigerant.

Optionally, the refrigeration system further includes a heat exchanger, the heat exchanger includes a first passage and a second passage, the first passage is connected in series between the depressurization branch and the first evaporator, the second passage is connected in series between the first control valve and the low-temperature refrigerant storage, or the second passage is fluidly connected with an outlet of the low-temperature refrigerant storage; the heat exchanger is used for cooling the first refrigerant at the downstream of the first control valve so as to reduce the pressure of the first refrigerant.

Optionally, the refrigeration system further includes a heating device for heating the first refrigerant in the low-temperature refrigerant storage to make the pressure at the downstream of the first control valve greater than the pressure at the upstream of the first control valve; the refrigeration system is configured to be capable of selectively operating in a first operation mode and a second operation mode, and when the refrigeration system operates in the first operation mode, the first control valve is controlled to be opened and then closed so that the first refrigerant in the gas-liquid separator enters the low-temperature refrigerant storage; when the refrigeration system operates in the second operation mode, the first control valve is controlled to be opened and then closed, so that the first refrigerant in the low-temperature refrigerant storage flows back to the gas-liquid separator.

Optionally, the refrigeration system further comprises a second control valve and a low-temperature pressure reducing component, and an outlet of the low-temperature refrigerant storage is sequentially and fluidly connected with the second control valve, the low-temperature pressure reducing component and an inlet of the first evaporator; the refrigeration system is configured to be capable of selectively operating in a first operation mode and a second operation mode, when the refrigeration system operates in the first operation mode, the second control valve is normally closed, and the first control valve is controlled to be opened and then closed, so that the first refrigerant in the gas-liquid separator enters the low-temperature refrigerant storage; when the refrigeration system operates in the second operation mode, the first control valve is normally closed, and the second control valve is controlled to be opened first and then closed, so that the first refrigerant in the low-temperature refrigerant storage flows to the first evaporator through the low-temperature pressure reducing component.

Optionally, the low-temperature refrigerant storage is a pipeline fluidly connected with the outlet of the first control valve.

Optionally, the second passageway is connected in series with an end of the conduit remote from the first control valve; alternatively, the second passage is a portion of the conduit and the portion is located at an end of the conduit remote from the first control valve.

Optionally, the refrigeration system further includes a pressure sensor for detecting a pressure of the first refrigerant in the low-temperature pressure reducing member.

Optionally, the pressure reducing branch comprises a first pressure reducing branch, a second pressure reducing branch and a reversing valve, the first pressure reducing branch is connected with the second pressure reducing branch in parallel, an inlet of the reversing valve is in fluid connection with a liquid phase outlet of the gas-liquid separator, the first pressure reducing branch comprises a first pressure reducing component connected in series between the reversing valve and the first evaporator, and the second pressure reducing branch comprises a second pressure reducing component and a second evaporator connected in series between the reversing valve and the first evaporator in sequence.

Optionally, the pressure reducing branch further includes a third pressure reducing branch including a third pressure reducing member and a third evaporator sequentially connected in series between the reversing valve and the first evaporator.

In addition, the invention also provides a refrigerator, which comprises the refrigerating system according to any one of the technical schemes.

Based on the foregoing description, it can be understood by those skilled in the art that in the foregoing technical solution of the present invention, by filling the first refrigerant and the second refrigerant in the refrigeration system, the gas-liquid separator, the first control valve and the low-temperature refrigerant storage are configured for the refrigeration system, and the gas phase outlet of the gas-liquid separator is fluidly connected with the inlet of the low-temperature refrigerant storage through the first control valve, so that the first refrigerant can enter the low-temperature refrigerant storage and be locked in the low-temperature refrigerant storage by the first control valve. Therefore, when the refrigerant in the refrigerating system is at low pressure, the first refrigerant can enter the low-temperature refrigerant storage, and the second refrigerant is mainly used for refrigerating, so that the conventional refrigeration of the refrigerating system is realized. When the refrigerant in the refrigerating system is at high pressure, the first refrigerant can flow out of the low-temperature refrigerant storage to simultaneously refrigerate by the first refrigerant and the second refrigerant, so that the low-temperature refrigeration of the refrigerating system is realized. Compared with the prior art that the refrigerating capacity is adjusted only by adjusting the operating frequency of the compressor, the refrigerating capacity adjusting capacity of the refrigerating system is improved.

Further, by configuring the heat exchanger for the refrigeration system and connecting the first passage of the heat exchanger in series between the depressurization branch and the first evaporator, and connecting the second passage of the heat exchanger in series between the first control valve and the low-temperature refrigerant storage (or connecting the second passage of the heat exchanger with the outlet of the low-temperature refrigerant storage in a fluid manner), the heat exchanger can cool the first refrigerant at the downstream of the first control valve to reduce the pressure of the first refrigerant and even liquefy the first refrigerant in the low-temperature refrigerant storage, thereby improving the capacity of the low-temperature refrigerant storage for storing the first refrigerant.

Further, when the refrigeration system operates in the first operation mode, the first control valve is controlled to be opened firstly, so that the low-temperature refrigerant storage stores enough first refrigerants under the action of the heat exchanger, and then the first control valve is closed, so that the refrigeration system mainly refrigerates through the second refrigerants. When the refrigerating system operates in the second operation mode, the first control valve is controlled to be opened first, so that the first refrigerant in the low-temperature refrigerant storage flows back to the gas-liquid separator to participate in refrigeration of the refrigerating system.

The above, as well as additional objectives, advantages, and features of the present invention will become apparent to those skilled in the art from the following detailed description of a specific embodiment of the present invention when read in conjunction with the accompanying drawings.

Drawings

In order to more clearly illustrate the technical solution of the present invention, some embodiments of the present invention will be described hereinafter with reference to the accompanying drawings. It will be understood by those skilled in the art that components or portions thereof identified in different drawings by the same reference numerals are identical or similar; the drawings of the invention are not necessarily to scale relative to each other.

In the accompanying drawings:

FIG. 1 is a schematic diagram of a refrigeration system according to some embodiments of the invention;

fig. 2 is a schematic view of a refrigeration system according to another embodiment of the present invention.

Detailed Description

It should be understood by those skilled in the art that the embodiments described below are only some embodiments of the present invention, but not all embodiments of the present invention, and the some embodiments are intended to explain the technical principles of the present invention and are not intended to limit the scope of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive effort, based on the embodiments provided by the present invention, shall still fall within the scope of protection of the present invention.

It should be noted that, in the description of the present invention, terms such as "center", "upper", "lower", "top", "bottom", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate directions or positional relationships, which are based on the directions or positional relationships shown in the drawings, are merely for convenience of description, and do not indicate or imply that the apparatus or elements must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

Furthermore, it should be noted that, in the description of the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected, can be indirectly connected through an intermediate medium, and can also be communicated with the inside of two elements. The specific meaning of the above terms in the present invention can be understood by those skilled in the art according to the specific circumstances.

A refrigeration system in some embodiments of the present invention is described in detail below with reference to fig. 1.

It should be noted that the refrigeration system of the present invention can be applied not only to a refrigerator but also to a refrigerator, a freezer, and the like.

As shown in fig. 1, in some embodiments of the present invention, a refrigeration system includes a compressor 1, a condenser 2, an anti-dew tube 3, a gas-liquid separator 4, a first dry filter 5, a depressurization branch 6, a first evaporator 7, a liquid storage bag 8, a first control valve 9, a low temperature refrigerant storage 10, a heat exchanger 11, a heating device 12, and a fan 13.

Wherein the first control valve 9 is preferably an electronically controlled bi-directional valve. When the first control valve 9 is opened, the refrigerant is allowed to flow through; when the first control valve 9 is closed, the refrigerant cannot pass. Furthermore, the person skilled in the art can also set the first control valve 9 as any other possible shut-off valve, as desired. The stop valve capable of realizing on-off of the refrigerant is a member well known to those skilled in the art, so that the description thereof will not be repeated here.

The low-temperature refrigerant storage 10 may be a separate container (e.g., a bottle, a capsule, etc.), or may be a tube. In some embodiments of the invention, the cryogenic refrigerant storage 10 is a conduit fluidly connected to the outlet of the first control valve 9.

Wherein the heating device 12 is preferably an electric heating wire, which is used for heating the low-temperature refrigerant storage 10. Optionally, the heating device 12 is disposed at an end of the low-temperature refrigerant reservoir 10 remote from the first control valve 9. In addition, the person skilled in the art may also make the heating device 12 heat other positions of the low temperature refrigerant storage 10, for example, heat an end of the low temperature refrigerant storage 10 near the first control valve 9, or heat a middle portion of the low temperature refrigerant storage 10, as required. Further, one skilled in the art can also cause the heating device 12 to heat the entire low temperature refrigerant storage 10 as needed.

With continued reference to fig. 1, the outlet of the compressor 1 is fluidly connected to the inlet of the condenser 2, the outlet of the condenser 2 is fluidly connected to the inlet of the anti-dew tube 3, and the outlet of the anti-dew tube 3 is fluidly connected to the inlet of the gas-liquid separator 4. The liquid phase outlet of the gas-liquid separator 4 is fluidly connected with the inlet of the first dry filter 5, the outlet of the first dry filter 5 is fluidly connected with the inlet of the depressurization branch 6, the outlet of the depressurization branch 6 is fluidly connected with the inlet of the first evaporator 7, the outlet of the first evaporator 7 is fluidly connected with the inlet of the liquid storage bag 8, and the outlet of the liquid storage bag 8 is fluidly connected with the inlet of the compressor 1. The gas phase outlet of the gas-liquid separator 4 is fluidly connected to the inlet of the first control valve 9, and the outlet of the first control valve 9 is fluidly connected to the inlet of the low temperature refrigerant reservoir 10.

In some embodiments of the present invention, the dew-proof pipe 3 is used to heat dew around the refrigerator door, thereby evaporating dew around the refrigerator door to keep the periphery of the refrigerator door dry. The first dry filter 5 mainly plays a role of impurity filtration.

Furthermore, in other embodiments of the present invention, the person skilled in the art may omit the provision of the anti-dew tube 3 and fluidly connect the outlet of the condenser 2 with the inlet of the gas-liquid separator 4, as desired. Alternatively, the person skilled in the art may omit the provision of the first drier-filter 5 as required. Alternatively, the person skilled in the art may also omit the provision of the exposure prevention pipe 3 and the first drier-filter 5 as desired.

With continued reference to FIG. 1, the heat exchanger 11 includes a first passage 111 and a second passage 112. Wherein the first passage 111 is connected in series between the pressure reducing branch 6 and the first evaporator 7, optionally the first passage 111 is part of a pipe connecting the pressure reducing branch 6 and the first evaporator 7 together. The second passage 112 is fluidly connected to an end of the low temperature refrigerant reservoir 10 remote from the first control valve 9. Alternatively, a part of the low-temperature refrigerant storage 10 may be used as the second passage 112, and the part of the low-temperature refrigerant storage 10 is preferably located at an end of the low-temperature refrigerant storage 10 away from the first control valve 9, as required by those skilled in the art.

Preferably, at least a portion of the low temperature refrigerant reservoir 10 has a height lower than the height of the gas phase outlet of the gas-liquid separator 4.

In other embodiments of the present invention, when the low temperature refrigerant storage 10 is a separate container, a person skilled in the art may also connect the second passage 112 in series between the first control valve 9 and the low temperature refrigerant storage 10 as required.

With continued reference to fig. 1, the depressurization branch 6 includes a first depressurization branch 61, a second depressurization branch 62, a third depressurization branch 63, and a reversing valve 64. Wherein the first voltage reducing branch 61, the second voltage reducing branch 62 and the third voltage reducing branch 63 are connected in parallel with each other. The inlet of the reversing valve 64 is fluidly connected to the outlet of the first filter drier 5, the outlet of the reversing valve 64 is fluidly connected to the inlet of the first pressure reducing branch 61, the inlet of the second pressure reducing branch 62 and the inlet of the third pressure reducing branch 63, respectively, and the outlet of the first pressure reducing branch 61, the outlet of the second pressure reducing branch 62 and the outlet of the third pressure reducing branch 63 are fluidly connected to the first evaporator 7, respectively.

Furthermore, in other embodiments of the present invention, the person skilled in the art may also make the depressurization branch 6 include only one or two of the first depressurization branch 61, the second depressurization branch 62, and the third depressurization branch 63, in addition to the reversing valve 64, as required.

With continued reference to fig. 1, the first pressure reducing branch 61 comprises a first pressure reducing member 611, preferably a capillary tube, in series between the reversing valve 64 and the first evaporator 7. Further, the first pressure reducing member 611 may be provided as any other possible member having a pressure reducing function, such as an electronic expansion valve, as necessary by those skilled in the art.

With continued reference to fig. 1, the second pressure reducing branch 62 comprises a second pressure reducing member 621 and a second evaporator 622 connected in series between the reversing valve 64 and the first evaporator 7, the second pressure reducing member 621 preferably being a capillary tube. Further, the second pressure reducing member 621 may be provided as any other possible member having a pressure reducing function, such as an electronic expansion valve, as necessary by those skilled in the art.

With continued reference to fig. 1, the third pressure reducing branch 63 includes a third pressure reducing member 631 and a third evaporator 632 in series between the reversing valve 64 and the first evaporator 7, the third pressure reducing member 631 preferably being a capillary tube. Further, the third pressure reducing member 631 may be provided as any other possible member having a pressure reducing function, such as an electronic expansion valve, as necessary by those skilled in the art.

The control valve 64 is preferably an electrically controlled reversing valve, which can at least control the flow of the refrigerant to the first pressure reducing branch 61, the second pressure reducing branch 62 or the third pressure reducing branch 63 alternatively. In addition, the person skilled in the art may also cause the control valve 64 to control the flow of the refrigerant to at least two of the first pressure reducing branch 61, the second pressure reducing branch 62 and the third pressure reducing branch 63, as required.

With continued reference to fig. 1, each of the condenser 2, the first evaporator 7, the second evaporator 622, and the third evaporator 632 is provided with one fan 13, respectively. The fan 13 corresponding to the condenser 2 is used for promoting the flow of air around the condenser 2 so as to improve the cooling efficiency of the condenser 2. The fans 13 corresponding to the first, second and third evaporators 7, 622 and 632 are used to promote the flow of air around the condenser 2, so as to improve the heat absorption efficiency of each of the first, second and third evaporators 7, 622 and 632.

Further, the blower 13 may be provided only for a part of the first, second and third evaporators 7, 622 and 632, or at least two of the first, second and third evaporators 7, 622 and 632 may share one blower 13, as necessary.

Further, although not shown, in some embodiments of the present invention, the refrigeration system further includes a pressure sensor for detecting the pressure of the refrigerant in the low-temperature-pressure reducing member 10. Further, the refrigeration system further includes a first temperature sensor corresponding to the first evaporator 7, a second temperature sensor corresponding to the second evaporator 622, and a third temperature sensor corresponding to the third evaporator 632. Wherein a first temperature sensor is used to detect the temperature of the first evaporator 7, a second temperature sensor is used to detect the temperature of the second evaporator 622, and a third temperature sensor is used to detect the temperature of the third evaporator 632.

Still further, in some embodiments of the present invention, the refrigerant filled in the refrigeration system is a mixed refrigerant, that is, the refrigerant filled in the refrigeration system includes at least two types. Illustratively, the refrigerant filled in the refrigeration system comprises a first refrigerant and a second refrigerant, wherein the boiling point temperature of the first refrigerant is lower than that of the second refrigerant. Illustratively, the first refrigerant is R290 and the second refrigerant is R600a.

In some embodiments of the present invention, the refrigeration system is selectively operable in a first mode of operation (low load mode of operation) and a second mode of operation (high load mode of operation). The operation mode of the refrigeration system will be described in detail with reference to fig. 1.

As an example one, the opening and closing of the first control valve 9 is controlled by temperature.

When the refrigeration system operates in the first operation mode (low-load operation mode), the first control valve 9 is opened, the mixed refrigerant (the first refrigerant and the second refrigerant) is compressed, heated and boosted by the compressor 1, enters the condenser 2 to radiate heat and cool to the environment, then enters the gas-liquid separator 4 after passing through the dew prevention pipe 3, and the mixed refrigerant is separated into gas and liquid in the gas-liquid separator 4.

The separated gaseous refrigerant (first refrigerant) rich in low-boiling point working medium enters a low-temperature refrigerant storage 10 (pipeline) for storage through a first control valve 9. When the temperature of the first evaporator 7, the second evaporator 622, or the third evaporator 632, or the temperature of the corresponding storage chamber reaches a first set temperature (e.g., -15 ℃, -10 ℃, -9 ℃, 5 ℃, etc.), the circulation loop of the refrigeration system (the circulation path other than the first control valve 9 and the low temperature refrigerant storage 10) reaches the refrigeration cycle balance, and the surplus first refrigerant is transferred into the low temperature refrigerant storage 10, at this time, the first control valve 9 is closed.

The separated liquid refrigerant (second refrigerant) rich in high boiling point working medium passes through the first dry filter 5 and then enters the first depressurization branch 61, the second depressurization branch 62 or the third depressurization branch 63 through the reversing valve 64: the liquid refrigerant (second refrigerant) throttles, cools, depressurizes by the first depressurization member 611, the second depressurization member 621, or the third depressurization member 631, and then evaporates and absorbs heat in the second evaporator 622 or the third evaporator 632, providing a desired amount of cold to the outside (e.g., a storage chamber of a refrigerator). Then, the refrigerant flows through the first evaporator 7 and the liquid storage bag 8 in this order, and then enters the compressor 1 again to be compressed.

When the refrigeration system is operated in the second operation mode (high load operation mode), the heating device 12 is turned on to heat the refrigerant (first refrigerant) rich in the low boiling point refrigerant in the low temperature refrigerant storage 10. When the pressure sensor detects that the pressure of the refrigerant in the low-temperature refrigerant storage 10 reaches a preset threshold value, the first control valve 9 is opened, so that the refrigerant (first refrigerant) rich in the low-boiling-point working medium enters the refrigerating system through the gas-liquid separator 4. When the temperature of the first evaporator 7, the second evaporator 622 or the third evaporator 632 or the temperature of the corresponding storage chamber reaches the second set temperature (which is smaller than the first set temperature), the circulation loop of the refrigeration system reaches the refrigeration cycle balance, and the circulation loop obtains enough first refrigerant from the low-temperature refrigerant storage 10, at this time, the heating device 12 is turned off, and the first control valve 9 is turned off. The refrigerant flows from the gas-liquid separator 4 through the first dry filter 5 and then enters the first depressurization branch 61, the second depressurization branch 62 or the third depressurization branch 63 through the reversing valve 64: the liquid refrigerant (second refrigerant) throttles, cools, depressurizes by the first depressurization member 611, the second depressurization member 621, or the third depressurization member 631, and then evaporates and absorbs heat in the second evaporator 622 or the third evaporator 632, providing a desired amount of cold to the outside (e.g., a storage chamber of a refrigerator). Then, the refrigerant flows through the first evaporator 7 and the liquid storage bag 8 in this order, and then enters the compressor 1 again to be compressed.

The preset threshold is greater than the pressure of the refrigerant at the upstream side of the first control valve 9, and may be any practical value, for example, 2Mpa, 3Mpa, 4Mpa, 5Mpa, etc. Wherein the second set temperature is any value less than the first set temperature, such as-30 ℃, -18 ℃, -15 ℃, -8 ℃, etc.

As an example two, the opening and closing of the first control valve 9 is controlled by the pressure of the refrigerant.

When the refrigerating system operates in a first operation mode (low-load operation mode), the mixed refrigerant (the first refrigerant and the second refrigerant) is compressed, heated and boosted by the compressor 1, enters the condenser 2 to radiate heat and cool to the environment, then enters the gas-liquid separator 4 after passing through the dew prevention pipe 3, and the mixed refrigerant is separated into gas and liquid in the gas-liquid separator 4.

The first control valve 9 is opened for a first preset time and then closed, so that the separated gaseous refrigerant (first refrigerant) rich in the low-boiling point working medium enters the low-temperature refrigerant storage 10 (pipeline) for storage through the first control valve 9. After the first control valve 9 is closed, the refrigerating system is operated for a second preset time, and then the high pressure of the refrigerant in the refrigerating system is detected. Specifically, the pressure of the refrigerant at any point between the compressor 1 and the reversing valve 64 can be detected. The detected pressure is then compared with a preset pressure. If the detected pressure is above the preset pressure of 0.1bar, the first control valve 9 is continued to be opened. The above process is repeated until the detected pressure is less than 0.1bar from the preset pressure difference, closing the first control valve 9 and not opening. At this time, it is determined that most of the gaseous refrigerant (first refrigerant) rich in the low-boiling-point refrigerant has been stored in the low-temperature refrigerant storage 10.

The circulation path of the separated liquid refrigerant (second refrigerant) rich in the high boiling point working medium is the same as that of the first example.

When the refrigeration system is operated in the second operation mode (high load operation mode), the heating device 12 is turned on to heat the refrigerant (first refrigerant) rich in the low boiling point refrigerant in the low temperature refrigerant storage 10. When it is detected that the temperature of the refrigerant in the low-temperature refrigerant storage 10 is higher than the ambient temperature by a third preset temperature, the first control valve 9 is opened, and the heating device 12 is allowed to continue heating for the third preset time, and then the first control valve 9 and the heating device 12 are closed. Then, the circulation paths of the refrigerants (the first refrigerant and the second refrigerant) in the refrigerating system are the same as those in the first example.

The value range of the first preset time is 5S to 10S, for example, 5S, 6S, 8S, 10S, etc. Alternatively, the first preset time may be set to any other feasible duration, such as 30S, 45S, 90S, etc., as desired by those skilled in the art.

Wherein the second preset time is preferably 3min. In addition, the person skilled in the art may set the second preset time to any other feasible duration, for example, 5min, 7min, 10min, etc., as required.

Wherein, the preset pressure can be obtained through multiple experiments. Illustratively, the refrigeration system is operated for a time sufficient to ensure that the refrigeration system reaches a steady state operation, and then the high pressure of the refrigerant in the refrigeration system is obtained. After repeating for a plurality of times, the obtained values are averaged to be used as the preset pressure.

Wherein the third preset time is in a range of 5min to 10min, for example, 5min, 6min, 8min, 10min, etc. Alternatively, the person skilled in the art may set the third preset time to any other feasible duration, such as 3min, 15min, 20min, etc., as desired.

Wherein the third preset temperature is preferably 10 ℃. In addition, the person skilled in the art can also set the third preset temperature to any other feasible temperature value, such as 5 ℃, 8 ℃, 12 ℃, 15 ℃ and the like, as desired.

As an example three, the opening and closing of the first control valve 9 is controlled by the opening probability of the compressor 1.

The first control valve 9 is opened for a fourth preset time, and then closed, so that the separated gaseous refrigerant (first refrigerant) rich in the low-boiling-point working medium enters the low-temperature refrigerant storage 10 (pipeline) for storage through the first control valve 9. The opening probability of the compressor 1 in the adjacent refrigeration cycle is then compared, and if the comparison result (absolute value of the difference value) does not exceed the first opening rate threshold value, the refrigeration system is indicated to be operating normally. If the refrigeration system is operating normally, the on-rate of the compressor 1 in the current refrigeration cycle (or the previous refrigeration cycle) is compared with a preset on-rate. If the comparison result (absolute value of the difference value) does not exceed the second start-up rate threshold (the second start-up rate threshold is greater than the first start-up rate threshold), it is determined that most of the gaseous refrigerant (the first refrigerant) rich in the low boiling point working medium has been stored in the low temperature refrigerant storage 10, so that the first control valve 9 is not opened any more, otherwise, the first control valve 9 is opened again for a fourth preset time, and then closed.

The control strategy of the first control valve 9 is the same as example one or two when the refrigeration system is operating in the second mode of operation (high load mode of operation).

Wherein the refrigeration cycle represents the duration of the compressor 1 being turned on and off once. The on probability represents the ratio of the operation time of the compressor 1 in the current cooling cycle to the current cooling cycle.

The fourth preset time ranges from 5S to 10S, for example, 5S, 6S, 8S, 10S, etc. Alternatively, the person skilled in the art may set the fourth preset time to any other feasible duration, such as 30S, 45S, 90S, etc., as desired.

The first power-on threshold is preferably 1%, and in addition, a person skilled in the art may set the first power-on threshold to any other feasible value, for example, 2%, 3%, 5%, 10%, etc., as required.

The second power-on threshold is preferably 2%, and the person skilled in the art may set the second power-on threshold to any other feasible value, for example, 3%, 5%, 8%, 10%, etc., as required.

The preset opening probability can be obtained through multiple experiments. For example, the first control valve 9 may be left open at all times, and then the refrigeration system is operated for a sufficient period of time to ensure that the refrigeration system reaches a steady state operation, and then the open probability of the compressor 1 is obtained. After repeated times, the obtained values are averaged to be used as a preset open probability.

It should be noted that, in some embodiments of the present invention, when the refrigeration system is operated in the first operation mode (low-load operation mode), the pressure between the compressor 1 and the reversing valve 64 is low, so as to ensure that the second refrigerant (high-boiling point refrigerant) is liquid, and at the same time, the first refrigerant (low-boiling point refrigerant) is gaseous, so that the gas-liquid separation between the first refrigerant and the second refrigerant is achieved at the gas-liquid separator. When the refrigeration system is operated in the second operation mode (high-load operation mode), the pressure between the compressor 1 and the reversing valve 64 is high, so that the first refrigerant (low-boiling-point refrigerant) and the second refrigerant (high-boiling-point refrigerant) are both in liquid state, and the first refrigerant and the second refrigerant participate in the refrigeration cycle of the refrigeration system at the same time.

Based on the foregoing description, those skilled in the art will appreciate that in some embodiments of the present invention, when the refrigeration system is operated in the first operation mode (low load operation mode), normal temperature refrigeration can be performed only by the second refrigerant (or a small amount of the first refrigerant is also included); in the second operation mode (high load operation mode), the mixed refrigerant of the first refrigerant and the second refrigerant can be used for low-temperature refrigeration, so that the refrigerating capacity adjusting capability of the refrigerating system is effectively improved compared with the refrigerating capacity adjusting method only by adjusting the operation frequency of the compressor 1.

Further, it can be understood by those skilled in the art that the circulating loop of the refrigeration system can automatically adjust the content of the first refrigerant (refrigerant with low boiling point working medium) therein, so that the proportion of the first refrigerant and the second refrigerant can be automatically adjusted according to the actual refrigeration working condition of the refrigeration system, the range of the refrigeration system for adjusting the refrigeration capacity is improved, and the use experience of users is optimized.

A refrigeration system in accordance with further embodiments of the present invention will be described in detail with reference to fig. 2.

Before proceeding, it should be noted that, for the sake of understanding by those skilled in the art, and for the sake of convenience of description, the following detailed description will only refer to the differences between the refrigeration system in other embodiments and those in the previous embodiments. In other embodiments, the refrigeration system is the same as that in some embodiments, please refer to the description of the refrigeration system in some embodiments.

As shown in fig. 2, in other embodiments of the present invention, the refrigeration system further includes a second control valve 14, a second dry filter 15, and a low temperature and pressure reducing member 16, and the heating apparatus 12 may be optionally omitted, as compared to some embodiments described previously.

Specifically, the inlet of the second passage 112 is fluidly connected to the outlet of the low temperature refrigerant reservoir 10, the outlet of the second passage 112 is fluidly connected to the inlet of the second control valve 14, the outlet of the second control valve 14 is fluidly connected to the inlet of the second filter drier 15, the outlet of the second filter drier 15 is fluidly connected to the inlet of the low temperature pressure reducing member 16, and the outlet of the low temperature pressure reducing member 16 is fluidly connected to the inlet of the first evaporator 7.

Alternatively, the second control valve 14 is an electronically controlled shut-off valve.

Further, the person skilled in the art may omit the provision of the second drier-filter 15 as required.

When the refrigeration system operates in the first operation mode (low-load operation mode), the second control valve 14 is always closed, the first control valve 9 is opened, the mixed refrigerant (the first refrigerant and the second refrigerant) is compressed by the compressor 1, heated and boosted, enters the condenser 2 to dissipate heat and cool to the environment, then enters the gas-liquid separator 4 after passing through the dew-proof pipe 3, and the mixed refrigerant is separated into gas and liquid in the gas-liquid separator 4.

The separated gaseous refrigerant (first refrigerant) rich in low-boiling point working medium enters a low-temperature refrigerant storage 10 (pipeline) for storage through a first control valve 9. When the temperature of the first evaporator 7, the second evaporator 622 or the third evaporator 632 or the temperature of the corresponding storage chamber reaches a first set temperature (e.g., -15 ℃, -10 ℃, -9 ℃, 5 ℃, etc.), the first control valve 9 is closed.

When the refrigeration system is operated in the second operation mode (high load operation mode), the first control valve 9 is always closed, and the heating device 12 is opened to heat the refrigerant (first refrigerant) rich in the low boiling point working medium in the low temperature refrigerant storage 10. When the pressure sensor detects that the pressure of the refrigerant in the low-temperature refrigerant storage 10 reaches a preset threshold, the second control valve 14 is opened so that the refrigerant (first refrigerant) rich in the low-boiling-point working medium enters the refrigeration system through a path along the second control valve 14, the second dry filter 15 and the low-temperature pressure reducing member 16. When the temperature of the first evaporator 7, the second evaporator 622 or the third evaporator 632 or the temperature of the corresponding storage chamber reaches a second set temperature, which is smaller than the first set temperature, the heating device 12 is turned off, and the second control valve 14 is turned off. The refrigerant flows from the gas-liquid separator 4 through the first dry filter 5 and then enters the first depressurization branch 61, the second depressurization branch 62 or the third depressurization branch 63 through the reversing valve 64: the liquid refrigerant (second refrigerant) throttles, cools, depressurizes by the first depressurization member 611, the second depressurization member 621, or the third depressurization member 631, and then evaporates and absorbs heat in the second evaporator 622 or the third evaporator 632, providing a desired amount of cold to the outside (e.g., a storage chamber of a refrigerator). Then, the refrigerant flows through the first evaporator 7 and the liquid storage bag 8 in this order, and then enters the compressor 1 again to be compressed.

It should be noted that, in other embodiments of the present invention, other control strategies of the first control valve 9 and the second control valve 14 may be referred to as examples two and three in some embodiments. Other embodiments differ from the previous embodiments mainly in that the low temperature refrigerant reservoir 10 still receives the first refrigerant through the first control valve 9, but discharges the first refrigerant through the second control valve 14, and the first control valve 9 and the second control valve 14 can be selectively opened only.

In one application scenario of the refrigeration system of the present invention, when the refrigeration system of the present invention is applied to a refrigerator, the refrigerator includes a freezing chamber, a refrigerating chamber, and a temperature changing chamber. The first evaporator 7 is a freezing evaporator for refrigerating the freezing chamber. The second evaporator 622 is a variable temperature evaporator for cooling the variable temperature chamber. The third evaporator 632 is a refrigerating chamber for refrigerating the refrigerating chamber.

Further, although not shown, in yet other embodiments of the invention, the invention also provides a refrigerator comprising a refrigeration system as described in any of the previous embodiments.

Thus far, the technical solution of the present invention has been described in connection with the foregoing embodiments, but it will be readily understood by those skilled in the art that the scope of the present invention is not limited to only these specific embodiments. The technical solutions in the above embodiments can be split and combined by those skilled in the art without departing from the technical principles of the present invention, and equivalent changes or substitutions can be made to related technical features, so any changes, equivalent substitutions, improvements, etc. made within the technical principles and/or technical concepts of the present invention will fall within the protection scope of the present invention.

Claims

1. A refrigerating system is filled with a first refrigerant and a second refrigerant, the boiling point temperature of the first refrigerant is lower than that of the second refrigerant, the refrigerating system comprises a compressor, a condenser, a gas-liquid separator, a depressurization branch, a first evaporator, a first control valve and a low-temperature refrigerant storage,

the outlet of the compressor is in fluid connection with the inlet of the condenser, the outlet of the condenser is in fluid connection with the inlet of the gas-liquid separator, the liquid phase outlet of the gas-liquid separator is in fluid connection with the inlet of the depressurization branch, the outlet of the depressurization branch is in fluid connection with the inlet of the first evaporator, and the outlet of the first evaporator is in fluid connection with the inlet of the compressor;

the gas phase outlet of the gas-liquid separator is in fluid connection with the inlet of the low-temperature refrigerant storage through the first control valve;

the first control valve is used for controlling whether the gas-liquid separator is communicated with the low-temperature refrigerant storage or not;

the low-temperature refrigerant storage is used for storing the first refrigerant.

2. The refrigeration system of claim 1, wherein,

the refrigeration system further includes a heat exchanger including a first pass and a second pass,

the first path is connected in series between the depressurization branch and the first evaporator,

the second passage is connected in series between the first control valve and the low-temperature refrigerant storage, or is in fluid connection with an outlet of the low-temperature refrigerant storage;

the heat exchanger is used for cooling the first refrigerant at the downstream of the first control valve so as to reduce the pressure of the first refrigerant.

3. The refrigeration system of claim 2, wherein,

the refrigerating system further comprises a heating device, wherein the heating device is used for heating the first refrigerant in the low-temperature refrigerant storage so that the pressure at the downstream of the first control valve is higher than the pressure at the upstream of the first control valve;

the refrigeration system is configured to be selectively operable in a first mode of operation and a second mode of operation,

when the refrigeration system operates in the first operation mode, the first control valve is controlled to be opened and then closed, so that the first refrigerant in the gas-liquid separator enters the low-temperature refrigerant storage;

when the refrigeration system operates in the second operation mode, the first control valve is controlled to be opened and then closed, so that the first refrigerant in the low-temperature refrigerant storage flows back to the gas-liquid separator.

4. The refrigeration system of claim 2, wherein,

the refrigeration system further includes a second control valve and a low temperature and pressure reducing member,

the outlet of the low-temperature refrigerant storage is sequentially and fluidly connected with the second control valve, the low-temperature pressure reducing component and the inlet of the first evaporator;

when the refrigeration system operates in the first operation mode, the second control valve is normally closed, and the first control valve is controlled to be opened and then closed, so that the first refrigerant in the gas-liquid separator enters the low-temperature refrigerant storage;

when the refrigeration system operates in the second operation mode, the first control valve is normally closed, and the second control valve is controlled to be opened first and then closed, so that the first refrigerant in the low-temperature refrigerant storage flows to the first evaporator through the low-temperature pressure reducing component.

5. The refrigeration system of claim 2, wherein,

the low-temperature refrigerant storage is a pipeline which is in fluid connection with the outlet of the first control valve.

6. The refrigeration system of claim 5, wherein,

the second passage is connected in series with one end of the pipeline away from the first control valve; or alternatively, the process may be performed,

the second passage is a portion of the conduit and the portion is located at an end of the conduit remote from the first control valve.

7. The refrigeration system according to any of claims 1 to 6, wherein,

the refrigeration system further includes a pressure sensor for detecting a pressure of the first refrigerant within the low temperature pressure reducing member.

8. The refrigeration system according to any of claims 1 to 6, wherein,

the pressure reducing branch circuit comprises a first pressure reducing branch circuit, a second pressure reducing branch circuit and a reversing valve,

the first voltage reducing branch and the second voltage reducing branch are connected in parallel,

the inlet of the reversing valve is in fluid connection with the liquid phase outlet of the gas-liquid separator,

the first depressurization branch includes a first depressurization member connected in series between the reversing valve and the first evaporator,

the second depressurization branch comprises a second depressurization member and a second evaporator which are sequentially connected in series between the reversing valve and the first evaporator.

9. The refrigeration system of claim 8, wherein,

the buck leg further includes a third buck leg,

the third depressurization branch comprises a third depressurization member and a third evaporator which are sequentially connected in series between the reversing valve and the first evaporator.

10. A refrigerator comprising the refrigeration system of any one of claims 1 to 9.