CN217236154U - Refrigerating system and refrigerator - Google Patents
Refrigerating system and refrigerator Download PDFInfo
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- CN217236154U CN217236154U CN202220406890.6U CN202220406890U CN217236154U CN 217236154 U CN217236154 U CN 217236154U CN 202220406890 U CN202220406890 U CN 202220406890U CN 217236154 U CN217236154 U CN 217236154U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
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Abstract
The utility model belongs to the technical field of the refrigeration, a refrigerating system and refrigerator are specifically provided. The utility model discloses aim at solving the relatively poor problem of ability that current refrigerating system relies on the operating frequency of adjustment compressor to adjust the refrigerating output. The utility model discloses a refrigerating system includes compressor, condenser, vapour and liquid separator, step-down branch road, first evaporimeter, first control valve and low temperature refrigerant memory, the export of compressor and the import fluid coupling of condenser, the export of condenser and the import fluid coupling of vapour and liquid separator, the liquid phase export of vapour and liquid separator and the import fluid coupling of step-down branch road, the export of step-down branch road and the import fluid coupling of first evaporimeter, the export of first evaporimeter and the import fluid coupling of compressor; and a gas-phase outlet of the gas-liquid separator is in fluid connection with an inlet of the low-temperature refrigerant storage through a first control valve. The utility model provides refrigerating system's refrigerating capacity regulating capacity has been promoted.
Description
Technical Field
The utility model belongs to the technical field of the refrigeration, a refrigerating system and refrigerator are specifically provided.
Background
With the improvement of living standard of people, the refrigerator has gone into every family and becomes an indispensable part of people's life. In order to meet different refrigeration requirements of users, the refrigerator needs to adjust the operation condition of a refrigeration system in the refrigerator according to changes of external loads (such as ambient temperature, temperature of stored food materials, weight and the like).
The existing refrigerator generally adjusts the refrigerating capacity of a refrigerating system by changing the operating frequency (rotating speed) of a compressor. However, since the rotational speed adjusting range of the compressor is limited, the refrigerating system has limited capacity of adjusting the refrigerating capacity, and cannot meet the actual demands of users.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to solve the relatively poor problem of ability that current refrigerating system relies on the operating frequency of adjustment compressor to adjust the refrigerating output.
In order to achieve the above object, the utility model provides a refrigeration system, its intussuseption is filled with first refrigerant and second refrigerant, the boiling temperature of first refrigerant is less than the boiling temperature of second refrigerant, refrigeration system includes compressor, condenser, vapour and liquid separator, step-down branch road, first evaporimeter, first control valve and low temperature refrigerant memory, the export of compressor with the import fluid connection of condenser, the export of condenser with the import fluid connection of vapour and liquid separator, the liquid phase outlet of vapour and liquid separator with the import fluid connection of step-down branch road, the export of step-down branch road with the import fluid connection of first evaporimeter, the export of first evaporimeter with the import fluid connection of compressor; a gas-phase outlet of the gas-liquid separator is in fluid connection with an 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; 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 pressure reducing 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 to 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, where the heating device is configured to heat the first refrigerant in the low-temperature refrigerant storage, so that a pressure downstream of the first control valve is greater than a pressure upstream of the first control valve; the refrigeration system is configured to selectively operate 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 firstly 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 firstly and then closed, so that the first refrigerant in the low-temperature refrigerant storage device flows back to the gas-liquid separator.
Optionally, the refrigeration system further includes a second control valve and a low-temperature depressurization member, and an outlet of the low-temperature refrigerant storage is sequentially in fluid connection with the second control valve, the low-temperature depressurization member, and an inlet of the first evaporator; the refrigeration system is configured to selectively operate 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 enabled to be normally closed, and the first control valve is controlled to be opened and then closed firstly, 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 device flows to the first evaporator through the low-temperature pressure reducing component.
Optionally, the low temperature refrigerant storage is a pipeline fluidly connected to an outlet of the first control valve.
Optionally, the second passageway is in series with an end of the conduit remote from the first control valve; alternatively, the second passageway 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, and the pressure sensor is configured to detect a pressure of the first refrigerant in the low-temperature pressure reducing member.
Optionally, the pressure reducing branch includes a first pressure reducing branch, a second pressure reducing branch and a reversing valve, the first pressure reducing branch is connected in parallel with the second pressure reducing branch, an inlet of the reversing valve is fluidly connected to a liquid phase outlet of the gas-liquid separator, the first pressure reducing branch includes a first pressure reducing member connected in series between the reversing valve and the first evaporator, and the second pressure reducing branch includes a second pressure reducing member and a second evaporator connected in series in sequence between the reversing valve and the first evaporator.
Optionally, the pressure reducing branch further includes a third pressure reducing branch, and the third pressure reducing branch includes a third pressure reducing member and a third evaporator connected in series between the reversing valve and the first evaporator in sequence.
Furthermore, the utility model also provides a refrigerator, this refrigerator includes any one of aforementioned technical scheme refrigerating system.
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, through filling the first refrigerant and the second refrigerant in the refrigeration system, configure the gas-liquid separator, the first control valve and the low-temperature refrigerant storage for the refrigeration system, and make the gas phase outlet of the gas-liquid separator and the inlet of the low-temperature refrigerant storage be in fluid connection 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, the utility model discloses a refrigerant in the refrigerating system can make in the first refrigerant gets into low temperature refrigerant memory when the low pressure to mainly refrigerate through the second refrigerant, with the conventional refrigeration that realizes refrigerating system. The utility model discloses a refrigerant in the refrigerating system can make first refrigerant flow low temperature refrigerant memory when high pressure to refrigerate simultaneously through first refrigerant and second refrigerant, refrigerate with the low temperature that realizes refrigerating system. Therefore, compared with the prior art in which the running frequency of the compressor is only adjusted to adjust the refrigerating capacity, the refrigerating capacity adjusting capacity of the refrigerating system is improved.
Furthermore, the heat exchanger is configured for the refrigeration system, the first passage of the heat exchanger is connected in series between the pressure reduction branch and the first evaporator, and the second passage of the heat exchanger is connected in series between the first control valve and the low-temperature refrigerant storage (or the second passage of the heat exchanger is connected with the outlet of the low-temperature refrigerant storage in a fluid manner), so that the heat exchanger can cool the first refrigerant at the downstream of the first control valve, the pressure of the first refrigerant is reduced, even the first refrigerant in the low-temperature refrigerant storage is liquefied, and the capacity of the low-temperature refrigerant storage for storing the first refrigerant is improved.
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 refrigerant under the action of the heat exchanger, and then the first control valve is closed so that the refrigeration system mainly performs refrigeration through the second refrigerant. When the refrigerating system operates in the second operation mode, the first control valve is controlled to be opened firstly, so that the first refrigerant in the low-temperature refrigerant storage device flows back to the gas-liquid separator to participate in the refrigeration of the refrigerating system.
The above and other objects, advantages and features of the present invention will become more apparent to those skilled in the art from the following detailed description of specific embodiments thereof, taken 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 below with reference to the accompanying drawings. Those skilled in the art will appreciate that elements or portions of the same reference number are the same or similar in different figures; the drawings of the present invention are not necessarily drawn to scale relative to each other. In the drawings:
FIG. 1 is a schematic diagram of the refrigeration system of some embodiments of the present invention;
fig. 2 is a schematic diagram of the refrigeration system according to another embodiment of the present invention.
Detailed Description
It is to be understood by those skilled in the art that the embodiments described below are only a part of the embodiments of the present invention, and not all embodiments of the present invention, and the part of the embodiments are intended to explain the technical principle of the present invention and not to limit the scope of the present invention. Based on the embodiments provided by the present invention, all other embodiments obtained by those skilled in the art without any inventive work should still fall within the scope of the present invention.
It should be noted that in the description of the present invention, the terms "center", "upper", "lower", "top", "bottom", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicating the directions or positional relationships are based on the directions or positional relationships shown in the drawings, which are only for convenience of description, and do not indicate or imply that the device or element 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 otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; either directly or indirectly through intervening media, or through the communication between two elements. The specific meaning of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
A refrigeration system in some embodiments of the invention is described in detail below with reference to fig. 1.
Before this, it should be noted that the refrigeration system of the present invention can be applied to not only refrigerators, but also freezers, etc.
As shown in fig. 1, in some embodiments of the present invention, the refrigeration system includes a compressor 1, a condenser 2, a dew prevention pipe 3, a gas-liquid separator 4, a first drying filter 5, a pressure reduction 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 electrically controlled two-way 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 through. Furthermore, the person skilled in the art may also set the first control valve 9 as any other possible shut-off valve, as desired. Since the stop valve capable of opening and closing the refrigerant is well known to those skilled in the art, it will not be described herein.
The low temperature coolant storage 10 may be an independent container (such as a bottle, a bag, etc.) or a pipe. In some embodiments of the present invention, the low temperature coolant storage 10 is a pipe fluidly connected to the outlet of the first control valve 9.
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 storage 10 away from the first control valve 9. In addition, one skilled in the art may also heat the low temperature refrigerant storage 10 by the heating device 12, for example, heating one end of the low temperature refrigerant storage 10 close to the first control valve 9, or heating the middle of the low temperature refrigerant storage 10. Further, the heating device 12 may be configured to heat the entire low temperature refrigerant storage 10 as needed by those skilled in the art.
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 in fluid connection with the inlet of the first dry filter 5, the outlet of the first dry filter 5 is in fluid connection with the inlet of the pressure reducing branch 6, the outlet of the pressure reducing branch 6 is in fluid connection with the inlet of the first evaporator 7, the outlet of the first evaporator 7 is in fluid connection with the inlet of the liquid storage bag 8, and the outlet of the liquid storage bag 8 is in fluid connection 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 storage 10.
The utility model discloses an in some embodiments, prevent dew pipe 3 and be used for heating refrigerator door dew all around to evaporate refrigerator door dew all around, so that keep dry all around of refrigerator door. The first filter drier 5 mainly functions as a filter for foreign substances.
Furthermore, in other embodiments of the present invention, the person skilled in the art may omit the anti-dew tube 3 and fluidly connect the outlet of the condenser 2 to the inlet of the gas-liquid separator 4, if necessary. Alternatively, the skilled person may omit the first filter-drier 5, if desired. Alternatively, the person skilled in the art may omit the dew prevention pipe 3 and the first filter-drier 5, if necessary.
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 storage 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 as needed by those skilled in the art, and preferably, the part of the low temperature refrigerant storage 10 is located at one end of the low temperature refrigerant storage 10 far from the first control valve 9.
Preferably, the height of at least a portion of the low temperature refrigerant storage 10 is 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 an independent container, a person skilled in the art may connect the second passage 112 in series between the first control valve 9 and the low temperature refrigerant storage 10 as needed.
With continued reference to fig. 1, the pressure reducing branch 6 includes a first pressure reducing branch 61, a second pressure reducing branch 62, a third pressure reducing branch 63, and a reversing valve 64. The first voltage-reducing branch 61, the second voltage-reducing branch 62 and the third voltage-reducing branch 63 are connected in parallel. An inlet of the reversing valve 64 is fluidly connected with an outlet of the first dry filter 5, an outlet of the reversing valve 64 is fluidly connected with an inlet of the first pressure reducing branch 61, an inlet of the second pressure reducing branch 62 and an inlet of the third pressure reducing branch 63, respectively, and an outlet of the first pressure reducing branch 61, an outlet of the second pressure reducing branch 62 and an outlet of the third pressure reducing branch 63 are fluidly connected with the first evaporator 7, respectively.
In addition, in other embodiments of the present invention, a person skilled in the art may also make the pressure reducing branch 6 include only one or two of the first pressure reducing branch 61, the second pressure reducing branch 62 and the third pressure reducing branch 63, in addition to the reversing valve 64, as required.
With continued reference to fig. 1, the first pressure reducing branch 61 includes a first pressure reducing means 611, preferably a capillary tube, in series between the reversing valve 64 and the first evaporator 7. In addition, the first pressure reducing means 611 can be any other feasible means with pressure reducing function, such as an electronic expansion valve, as required by those skilled in the art.
With continued reference to fig. 1, the second pressure reducing branch 62 includes a second pressure reducing means 621, preferably a capillary tube, and a second evaporator 622 connected in series between the reversing valve 64 and the first evaporator 7. In addition, the second pressure reducing means 621 can be any other feasible means with pressure reducing function, such as an electronic expansion valve, as required by those skilled in the art.
With continued reference to FIG. 1, the third depressurization branch 63 includes a third depressurization member 631, preferably a capillary tube, and a third evaporator 632 connected in series between the reversing valve 64 and the first evaporator 7. In addition, the third depressurizing means 631 can be any other means with depressurizing function, such as an electronic expansion valve, as required by those skilled in the art.
The control valve 64 is preferably an electrically controlled direction valve, which can control the refrigerant to flow to the first pressure reducing branch 61, the second pressure reducing branch 62 or the third pressure reducing branch 63 alternatively. In addition, a person skilled in the art may also control the refrigerant flow to at least two of the first pressure-reducing branch 61, the second pressure-reducing branch 62 and the third pressure-reducing branch 63 by using the control valve 64 according to requirements.
With continued reference to fig. 1, one fan 13 is provided for each of the condenser 2, the first evaporator 7, the second evaporator 622, and the third evaporator 632. 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 fan 13 corresponding to each of the first evaporator 7, the second evaporator 622, and the third evaporator 632 is used to promote the flow of air around the condenser 2, so as to improve the heat absorption efficiency of each of the first evaporator 7, the second evaporator 622, and the third evaporator 632.
Further, those skilled in the art may also configure the fan 13 only for a part of the first evaporator 7, the second evaporator 622, and the third evaporator 632, or make at least two of the first evaporator 7, the second evaporator 622, and the third evaporator 632 share one fan 13, as necessary.
Further, although not shown in the drawings, 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, the first temperature sensor is used for detecting the temperature of the first evaporator 7, the second temperature sensor is used for detecting the temperature of the second evaporator 622, and the third temperature sensor is used for detecting 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, and 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 R600 a.
In some embodiments of the present invention, the refrigeration system can be selectively operated 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, the opening and closing of the first control valve 9 is controlled by temperature.
When the refrigeration system operates in a first operation mode (low-load operation mode), the first control valve 9 is opened, mixed refrigerants (a first refrigerant and a second refrigerant) are compressed by the compressor 1, heated and pressurized, then enter the condenser 2 to dissipate heat to the environment and cool, then enter the gas-liquid separator 4 through the anti-dew pipe 3, and the mixed refrigerants realize gas-liquid separation in the gas-liquid separator 4.
The separated gaseous refrigerant (first refrigerant) rich in the working medium with the low boiling point enters a low-temperature refrigerant storage device 10 (pipeline) through a first control valve 9 for storage. 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 (for example, -15 ℃, -10 ℃, -9 ℃, 5 ℃ and the like), the circulation loop of the refrigeration system (the circulation path excluding the first control valve 9 and the low temperature refrigerant storage 10) reaches a refrigeration cycle balance, the surplus first refrigerant is transferred into the low temperature refrigerant storage 10, and at this time, the first control valve 9 is closed.
The separated liquid refrigerant (second refrigerant) rich in the high-boiling point working medium passes through the first drying filter 5 and then enters the first pressure reducing branch 61, the second pressure reducing branch 62 or the third pressure reducing branch 63 through the reversing valve 64: the liquid refrigerant (second refrigerant) is throttled, cooled and depressurized by the first depressurizing device 611, the second depressurizing device 621 or the third depressurizing device 631, and then evaporated and absorbs heat in the second evaporator 622 or the third evaporator 632 to provide required cooling capacity for the outside (for example, a storage room of a refrigerator). Then, the refrigerant flows through the first evaporator 7 and the reservoir 8 in this order, and then enters the compressor 1 again to be compressed.
When the refrigeration system operates 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 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 value, the first control valve 9 is opened, so that the refrigerant (first refrigerant) rich in the low-boiling-point working medium enters the refrigeration 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 a second set temperature (which is lower than the first set temperature), the refrigeration cycle of the refrigeration system reaches a balance, the circulation circuit receives enough first refrigerant from the low temperature refrigerant storage 10, and then the heating device 12 is turned off, and the first control valve 9 is turned off. After flowing through the first filter drier 5 from the gas-liquid separator 4, the refrigerant enters the first pressure reducing branch 61, the second pressure reducing branch 62 or the third pressure reducing branch 63 through the reversing valve 64: the liquid refrigerant (second refrigerant) is throttled, cooled and depressurized by the first depressurizing device 611, the second depressurizing device 621 or the third depressurizing device 631, and then evaporated and absorbs heat in the second evaporator 622 or the third evaporator 632 to provide required cooling capacity for the outside (for example, a storage room of a refrigerator). Then, the refrigerant flows through the first evaporator 7 and the reservoir 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 feasible value, such as 2Mpa, 3Mpa, 4Mpa, 5Mpa, and the like. Wherein the second set point temperature is any value less than the first set point temperature, such as-30 ℃, -18 ℃, -15 ℃, -8 ℃ and the like.
As a second example, 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), mixed refrigerants (a first refrigerant and a second refrigerant) are compressed by the compressor 1, heated and pressurized, then enter the condenser 2 to radiate heat to the environment and cool, then enter the gas-liquid separator 4 through the anti-dew pipe 3, and the mixed refrigerants realize gas-liquid separation 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) through the first control valve 9 for storage. After the first control valve 9 is closed, the refrigeration system is operated for a second preset time, and then the high pressure of the refrigerant in the refrigeration system is detected. Specifically, the pressure of the refrigerant at any position between the compressor 1 and the direction change valve 64 can be detected. The detected pressure is then compared to a preset pressure. If the detected pressure is above the preset pressure by 0.1bar, the first control valve 9 continues to be opened. The above process is repeated until the detected pressure is less than 0.1bar from the preset pressure, the first control valve 9 is closed and is not opened any more. At this time, it is determined that most of the gaseous refrigerant (first refrigerant) rich in the low boiling point working medium 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 the first example.
When the refrigeration system operates 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 working medium in the low-temperature refrigerant storage 10. When the temperature of the refrigerant in the low-temperature refrigerant storage 10 is detected to be higher than the ambient temperature by a third preset temperature, the first control valve 9 is opened, the heating device 12 is enabled to continue heating for a third preset time, and then the first control valve 9 and the heating device 12 are closed. Thereafter, the circulation path of the refrigerants (the first refrigerant and the second refrigerant) in the refrigeration system is the same as the first example.
The value range of the first preset time is 5S to 10S, for example, 5S, 6S, 8S, 10S, and the like. Alternatively, the first preset time may be set to any other feasible time length by those skilled in the art, for example, 30S, 45S, 90S, etc., as needed.
Wherein the second preset time is preferably 3 min. In addition, the second preset time can be set to any other feasible time length by those skilled in the art according to the requirement, such as 5min, 7min, 10min, and the like.
Wherein the preset pressure can be obtained through a plurality of experiments. Illustratively, the refrigeration system is continuously operated for a sufficient time to ensure that the refrigeration system reaches a steady state operation and then a high pressure of the refrigerant in the refrigeration system is obtained. After repeating for a plurality of times, averaging the values obtained for a plurality of times to serve as the preset pressure.
Wherein, the value range of the third preset time is 5min to 10min, such as 5min, 6min, 8min, 10min, and the like. Alternatively, the third preset time can be set to any other feasible time length by those skilled in the art according to the requirement, for example, 3min, 15min, 20min, and so on.
Wherein the third preset temperature is preferably 10 ℃. In addition, the third preset temperature can be set to any other feasible temperature value, such as 5 ℃, 8 ℃, 12 ℃, 15 ℃ and the like, as required by those skilled in the art.
As an example three, the opening and closing of the first control valve 9 is controlled by the opening rate of the compressor 1.
When the refrigerating system operates in a first operation mode (low-load operation mode), mixed refrigerants (a first refrigerant and a second refrigerant) are compressed by the compressor 1, heated and pressurized, then enter the condenser 2 to radiate heat to the environment and cool, then enter the gas-liquid separator 4 through the anti-dew pipe 3, and the mixed refrigerants realize gas-liquid separation in the gas-liquid separator 4.
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) through the first control valve 9 for storage. Then, the on-state rates of the compressor 1 in the adjacent refrigeration cycles are compared, and if the comparison result (the absolute value of the difference) does not exceed the first on-state rate threshold, the refrigeration system is indicated to be operated normally. If the refrigeration system is operating normally, the on-time rate of the compressor 1 in the current refrigeration cycle (or the last refrigeration cycle) is compared with the preset on-time rate. If the comparison result (the absolute value of the difference) does not exceed the second on-state probability threshold (the second on-state probability threshold is greater than the first on-state probability 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, and if not, the first control valve 9 is opened again for a fourth preset time and then closed.
When the refrigeration system is operated in the second operation mode (high load operation mode), the control strategy of the first control valve 9 is the same as that of example one or two.
The refrigeration cycle indicates the duration of one time the compressor 1 is turned on and off. The on-time ratio represents a ratio of an operation time of the compressor 1 in the current refrigeration cycle to the current refrigeration cycle.
The value range of the fourth preset time is 5S to 10S, for example, 5S, 6S, 8S, 10S, and the like. Alternatively, the fourth preset time may be set to any other feasible time length by those skilled in the art, for example, 30S, 45S, 90S, and so on.
The first threshold value of the turn-on rate is preferably 1%, and those skilled in the art can set the first threshold value of the turn-on rate to any other feasible value, such as 2%, 3%, 5%, 10%, etc., as needed.
The second threshold value of the turn-on rate is preferably 2%, and those skilled in the art can set the second threshold value of the turn-on rate to any other feasible value, such as 3%, 5%, 8%, 10%, etc., as needed.
The preset turn-on rate can be obtained through multiple experiments. For example, the first control valve 9 may be always in an open state, and then the refrigeration system may be continuously operated for a sufficient time to ensure that the refrigeration system reaches a stable operation state, and then the on-rate of the compressor 1 is obtained. After repeating for multiple times, the average value of the values obtained for multiple times is calculated to serve as the preset turn-on rate.
It should be noted that, in some embodiments of the present invention, when the refrigeration system operates in the first operation mode (low-load operation mode), the pressure between the compressor 1 and the direction-changing valve 64 is lower, so as to ensure that the second refrigerant (high-boiling point refrigerant) is liquid, and at the same time, make the first refrigerant (low-boiling point refrigerant) gaseous, and then make the first refrigerant and the second refrigerant realize gas-liquid separation at the gas-liquid separator. When the refrigeration system operates 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 a 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, it can be understood by those skilled in the art that, in some embodiments of the present invention, the refrigeration system can perform normal temperature refrigeration only by the second refrigerant (or a small amount of the first refrigerant is included) when operating in the first operation mode (low load operation mode); when the second operation mode (high-load operation mode) is operated, the low-temperature refrigeration can be performed through the mixed refrigerant of the first refrigerant and the second refrigerant, and the refrigerating capacity adjusting capacity of the refrigerating system is effectively improved compared with the method of adjusting the refrigerating capacity only by adjusting the operation frequency of the compressor 1.
Furthermore, as can be understood by those skilled in the art, the circulation loop of the refrigeration system can automatically adjust the content of the first refrigerant (the refrigerant of the 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 condition of the refrigeration system, the range of the refrigeration system for adjusting the refrigerating capacity is expanded, and the use experience of a user is optimized.
Further embodiments of the refrigeration system of the present invention are described in detail below with reference to fig. 2.
Before this point, it should be noted that, for the convenience of understanding of those skilled in the art and for the convenience of description, only the differences between the refrigeration systems in the other embodiments and those in the previous embodiments will be described in detail. In other embodiments, the refrigeration system is the same as the refrigeration system in some of the previous embodiments, as described in some of the previous embodiments.
As shown in fig. 2, in contrast to some of the embodiments described hereinbefore, in other embodiments of the present invention, the refrigeration system further comprises a second control valve 14, a second filter-drier 15 and a low temperature pressure-reducing member 16, and the heating device 12 may be optionally omitted.
Specifically, an inlet of the second passage 112 is fluidly connected to an outlet of the low temperature refrigerant storage 10, an outlet of the second passage 112 is fluidly connected to an inlet of the second control valve 14, an outlet of the second control valve 14 is fluidly connected to an inlet of the second dry filter 15, an outlet of the second dry filter 15 is fluidly connected to an inlet of the low temperature depressurizing means 16, and an outlet of the low temperature depressurizing means 16 is fluidly connected to an inlet of the first evaporator 7.
Optionally, the second control valve 14 is an electrically controlled shut-off valve.
Further, the person skilled in the art may omit the second filter-drier 15, if necessary.
When the refrigerating system operates in a first operation mode (low-load operation mode), the second control valve 14 is always closed, the first control valve 9 is opened, mixed refrigerants (a first refrigerant and a second refrigerant) are compressed by the compressor 1, heated and pressurized, then enter the condenser 2 to radiate heat to the environment and cool, then enter the gas-liquid separator 4 through the anti-dew pipe 3, and the mixed refrigerants realize gas-liquid separation in the gas-liquid separator 4.
The separated gaseous refrigerant (first refrigerant) rich in the working medium with the low boiling point enters a low-temperature refrigerant storage device 10 (pipeline) through a first control valve 9 for storage. 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.
The separated liquid refrigerant (second refrigerant) rich in the high-boiling point working medium passes through the first drying filter 5 and then enters the first pressure reducing branch 61, the second pressure reducing branch 62 or the third pressure reducing branch 63 through the reversing valve 64: the liquid refrigerant (second refrigerant) is throttled, cooled and depressurized by the first depressurizing device 611, the second depressurizing device 621 or the third depressurizing device 631, and then evaporated and absorbs heat in the second evaporator 622 or the third evaporator 632 to provide required cooling capacity for the outside (for example, a storage room of a refrigerator). Then, the refrigerant flows through the first evaporator 7 and the reservoir 8 in this order, and then enters the compressor 1 again to be compressed.
When the refrigeration system operates in the second operation mode (high-load operation mode), the first control valve 9 is always closed, the heating device 12 is opened, and the refrigerant (first refrigerant) rich in the low-boiling-point working medium in the low-temperature refrigerant storage 10 is heated. 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 drying filter 15 and the low-temperature pressure reduction 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 less than the first set temperature), the heating device 12 is turned off, and the second control valve 14 is closed. After flowing through the first filter drier 5 from the gas-liquid separator 4, the refrigerant enters the first pressure reducing branch 61, the second pressure reducing branch 62 or the third pressure reducing branch 63 through the reversing valve 64: the liquid refrigerant (second refrigerant) is throttled, cooled and depressurized by the first depressurizing device 611, the second depressurizing device 621 or the third depressurizing device 631, and then evaporated and absorbs heat in the second evaporator 622 or the third evaporator 632 to provide required cooling capacity for the outside (for example, a storage room of a refrigerator). Then, the refrigerant flows through the first evaporator 7 and the reservoir 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 can be found in the second example and the third example in some embodiments. The main difference between the other embodiments and the previous embodiments is that the low temperature refrigerant storage 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 only be opened alternatively.
The utility model discloses in refrigerating system's an application scene, work as the utility model discloses a when refrigerating system used on the refrigerator, the refrigerator includes freezer, walk-in and temperature-changing room. The first evaporator 7 is a freezing evaporator for refrigerating the freezing chamber. The second evaporator 622 is a variable temperature evaporator for refrigerating the variable temperature chamber. The third evaporator 632 is a refrigerating chamber, and is used for refrigerating the refrigerating chamber.
Further, although not shown in the drawings, in still other embodiments of the present invention, the present invention further provides a refrigerator including the refrigeration system described in any of the foregoing embodiments.
So far, the technical solution of the present invention has been described in connection with the foregoing embodiments, but it is easily understood by those skilled in the art that the scope of the present invention is not limited to these specific embodiments. Without deviating from the technical principle of the present invention, those skilled in the art can split and combine the technical solutions in the above embodiments, and also can make equivalent changes or substitutions for related technical features, and any changes, equivalent substitutions, improvements, etc. made within the technical concept and/or technical principle of the present invention will fall within the protection scope of the present invention.
Claims (10)
1. A refrigeration system is characterized in that a first refrigerant and a second refrigerant are filled in the refrigeration system, the boiling point temperature of the first refrigerant is lower than that of the second refrigerant, the refrigeration system comprises a compressor, a condenser, a gas-liquid separator, a pressure reduction branch, a first evaporator, a first control valve and a low-temperature refrigerant storage,
an outlet of the compressor is in fluid connection with an inlet of the condenser, an outlet of the condenser is in fluid connection with an inlet of the gas-liquid separator, a liquid phase outlet of the gas-liquid separator is in fluid connection with an inlet of the pressure reduction branch, an outlet of the pressure reduction branch is in fluid connection with an inlet of the first evaporator, and an outlet of the first evaporator is in fluid connection with an 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;
the low-temperature refrigerant storage is used for storing the first refrigerant.
2. The refrigerant system as set forth in claim 1,
the refrigeration system further includes a heat exchanger including a first pass and a second pass,
the first passage is connected in series between the pressure reducing branch and the first evaporator,
the second passage is connected between the first control valve and the low-temperature refrigerant storage in series, or the second passage 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 refrigerant system as set forth in claim 2,
the refrigeration system further comprises a heating device, and the heating device is used for heating the first refrigerant in the low-temperature refrigerant storage device, so that the pressure at the downstream of the first control valve is greater than the pressure at the upstream of the first control valve.
4. The refrigerant system as set forth in claim 2,
the refrigeration system further includes a second control valve and a low temperature pressure reducing member,
and an outlet of the low-temperature refrigerant storage is sequentially in fluid connection with the second control valve, the low-temperature pressure reduction component and an inlet of the first evaporator.
5. The refrigerant system as set forth in claim 2,
the low temperature refrigerant storage is a pipeline in fluid connection with an outlet of the first control valve.
6. The refrigerant system as set forth in claim 5,
the second passage is connected with one end of the pipeline far away from the first control valve in series; alternatively, the first and second electrodes may be,
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 one of claims 1 to 6,
the refrigeration system further comprises a pressure sensor, and the pressure sensor is used for detecting the pressure of the first refrigerant in the low-temperature pressure reduction component.
8. The refrigeration system according to any one of claims 1 to 6,
the pressure reducing branch comprises a first pressure reducing branch, a second pressure reducing branch and a reversing valve,
the first voltage reduction branch and the second voltage reduction 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 depressurizing branch includes a first depressurizing means connected in series between the direction changing valve and the first evaporator,
the second pressure reducing branch comprises a second pressure reducing component and a second evaporator which are sequentially connected in series between the reversing valve and the first evaporator.
9. The refrigerant system as set forth in claim 8,
the voltage reduction branch also comprises a third voltage reduction branch,
the third pressure reducing branch comprises a third pressure reducing component and a third evaporator which are sequentially connected in series between the reversing valve and the first evaporator.
10. A refrigerator comprising a refrigeration system according to any one of claims 1 to 9.
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| CN202220406890.6U CN217236154U (en) | 2022-02-25 | 2022-02-25 | Refrigerating system and refrigerator |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115355640A (en) * | 2022-08-26 | 2022-11-18 | 青岛海尔中央空调有限公司 | Method and device for controlling water chilling unit, water chilling unit and storage medium |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115355640A (en) * | 2022-08-26 | 2022-11-18 | 青岛海尔中央空调有限公司 | Method and device for controlling water chilling unit, water chilling unit and storage medium |
| CN115355640B (en) * | 2022-08-26 | 2024-03-22 | 青岛海尔中央空调有限公司 | Method and device for controlling water chilling unit, water chilling unit and storage medium |
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