Refrigerator

Abstract

The utility model relates to the technical field of refrigerators, and discloses a refrigerator which comprises a machine shell provided with a temperature changing chamber. The refrigerant circulating system comprises a first variable-temperature evaporator and a second variable-temperature evaporator, and the first variable-temperature evaporator and the second variable-temperature evaporator are connected in series and arranged in the variable-temperature chamber; a first capillary tube and a second capillary tube which are connected in parallel are arranged at the upstream of the first variable-temperature evaporator, and the flow rates of the first capillary tube and the second capillary tube are different; the second variable-temperature evaporator is located on the downstream of the first variable-temperature evaporator, and the two ends of the second variable-temperature evaporator communicate with the bypass pipeline. The electromagnetic valve assembly comprises a first electromagnetic valve and a second electromagnetic valve; wherein the first electromagnetic valve is arranged on the upstream of the first capillary tube and used for controlling a refrigerant to flow to the first variable-temperature evaporator from the first capillary tube or the second capillary tube; the second electromagnetic valve is arranged between the first variable-temperature evaporator and the second variable-temperature evaporator and used for controlling the refrigerant to flow to the bypass pipeline or the second variable-temperature evaporator.

Description

Technical Field

[0001] The present application relates to the technical field of refrigerators, for example, to a refrigerator. Background Art

[0002] At present, refrigerators have become a common household appliance used to freeze and refrigerate food, bringing great convenience to people's lives. With the diversification of people's demand for food storage, refrigerators with variable temperature chambers have come into being. When choosing to store food, it is necessary to select a suitable storage temperature for the variable temperature chamber according to the characteristics and needs of the food to ensure the safety and deliciousness of the food.

[0003] The related art discloses a refrigerator, which has a refrigerating chamber, a freezing chamber and a variable temperature chamber, and uses an evaporator to cool each chamber separately. In addition, by adjusting the temperature of the variable temperature chamber, the variable temperature chamber can be used for refrigeration or freezing.

[0004] In the process of implementing the embodiments of the present disclosure, it is found that there are at least the following problems in the related art:

[0005] When the variable temperature chamber is used for refrigeration, it does not require a very low evaporation temperature or a lot of cooling capacity to meet the refrigeration needs. However, the area of ​​the evaporator in the variable temperature chamber cannot be adjusted, and the excess evaporation area leads to a relatively low temperature at the variable temperature outlet. Additional heating wires need to be added for auxiliary heating to meet the set refrigeration temperature requirements.

[0006] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present application, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Utility Model Content

[0007] In order to provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. The summary is not an extensive review, nor is it intended to identify key / critical components or delineate the scope of protection of these embodiments, but rather serves as a prelude to the detailed description that follows.

[0008] The disclosed embodiment provides a refrigerator that solves the problem of excess evaporation area when the variable temperature chamber is used as a refrigerating chamber.

[0009] In some embodiments, the refrigerator comprises:

[0010] The casing is provided with a temperature-changing chamber;

[0011] A refrigerant circulation system comprises a first temperature-variable evaporator and a second temperature-variable evaporator, wherein the first temperature-variable evaporator and the second temperature-variable evaporator are connected in series and arranged in a temperature-variable chamber; and a first capillary tube and a second capillary tube connected in parallel are arranged upstream of the first temperature-variable evaporator, and the flow rates of the first capillary tube and the second capillary tube are different; the second temperature-variable evaporator is located downstream of the first temperature-variable evaporator, and both ends of the second temperature-variable evaporator are connected to a bypass pipeline;

[0012] The solenoid valve assembly includes a first solenoid valve and a second solenoid valve; wherein the first solenoid valve is arranged upstream of the first capillary tube, and is used to control the refrigerant to flow from the first capillary tube or the second capillary tube to the first temperature variable evaporator; the second solenoid valve is arranged between the first temperature variable evaporator and the second temperature variable evaporator, and is used to control the refrigerant to flow to the bypass line or the second temperature variable evaporator.

[0013] Optionally, the flow rate of the first capillary tube is greater than the flow rate of the second capillary tube;

[0014] When the variable temperature chamber is used for refrigeration, the first solenoid valve controls the refrigerant to flow from the first capillary tube to the first temperature variable evaporator, and the second solenoid valve controls the refrigerant to flow to the bypass line.

[0015] Optionally, the variable temperature chamber is provided with a variable temperature fan;

[0016] When the variable temperature room is used for refrigeration, the speed of the variable temperature fan is reduced.

[0017] Optionally, the flow rate of the first capillary tube is greater than the flow rate of the second capillary tube;

[0018] When the temperature-variable chamber is used for refrigeration, the first solenoid valve controls the refrigerant to flow from the second capillary tube to the first temperature-variable evaporator, and the second solenoid valve controls the refrigerant to flow to the second temperature-variable evaporator.

[0019] Optionally, the housing is further provided with a refrigerating chamber, and the refrigerant circulation system further comprises a refrigerating evaporator; the refrigerating evaporator is arranged in the refrigerating chamber, and a refrigerating capillary tube is arranged upstream of the refrigerating evaporator;

[0020] The flow rate of the first capillary tube is the same as the flow rate of the refrigeration capillary tube.

[0021] Optionally, the refrigeration evaporator and the first temperature variable evaporator are arranged in parallel.

[0022] Optionally, the housing is further provided with a freezing chamber, and the refrigerant circulation system further includes a freezing evaporator; the freezing evaporator is arranged in the freezing chamber, and a freezing capillary is arranged upstream of the freezing evaporator;

[0023] The flow rate of the second capillary tube is the same as the flow rate of the freezing capillary tube.

[0024] Optionally, the freezing evaporator and the first temperature variable evaporator are arranged in series.

[0025] Optionally, the freezing capillary tube is arranged in parallel with the first temperature variable evaporator.

[0026] Optionally, the first solenoid valve is provided with two outlets, and the two outlets are respectively connected to the first capillary tube and the second capillary tube;

[0027] The second solenoid valve is provided with two outlets, and the two outlets are respectively connected to the bypass pipeline and the second temperature-variable evaporator.

[0028] The refrigerator provided by the embodiment of the present disclosure can achieve the following technical effects:

[0029] Since the flow rates of the first capillary tube and the second capillary tube are different, when the first solenoid valve is used to control the refrigerant to flow through the first capillary tube and the second capillary tube respectively, the evaporation temperature of the first variable temperature evaporator is different. Here, when the refrigerant flows through the capillary tube with a larger flow rate, the evaporation temperature of the first variable temperature evaporator is higher. The overall evaporation area of ​​the variable temperature chamber is equal to the sum of the evaporation areas of the first variable temperature evaporator and the second variable temperature evaporator. Therefore, when the second variable temperature evaporator is bypassed by controlling the bypass line through the second solenoid valve, the second variable temperature evaporator no longer exchanges heat and its evaporation area is zero. At this time, the overall heat exchange area of ​​the variable temperature chamber is the smallest. In this way, when the variable temperature chamber is used as a cold storage room, the second solenoid valve can be used to reduce the overall heat exchange area of ​​the variable temperature chamber, and the first solenoid valve can be further used to increase the evaporation temperature of the first variable temperature evaporator. Therefore, after the evaporation area is reduced, it is beneficial to leave more cold capacity for other heat exchangers, and the air outlet temperature of the variable temperature chamber is also increased, which effectively improves the energy efficiency of the refrigerator.

[0030] The above general description and the following description are exemplary and explanatory only and are not intended to limit the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] One or more embodiments are exemplarily described by corresponding drawings, which do not limit the embodiments. Elements with the same reference numerals in the drawings are shown as similar elements, and the drawings do not constitute a scale limitation, and wherein:

[0032] Figure 1 is a schematic diagram of a refrigerant circulation system of an air conditioner provided in an embodiment of the present disclosure;

[0033] Figure 2 is a schematic diagram of the refrigerant flow direction when the variable temperature chamber provided by the embodiment of the present disclosure is used for refrigeration;

[0034] Figure 3 is a schematic diagram of the refrigerant flow direction when the variable temperature chamber provided by the embodiment of the present disclosure is used for refrigeration;

[0035] Figure 4 It is a schematic diagram of the refrigerant flow direction when the variable temperature chamber provided by the embodiment of the present disclosure is idle.

[0036] Reference numerals:

[0037] 100: compressor; 110: condenser; 120: first temperature-variable evaporator; 121: first capillary tube; 122: second capillary tube; 130: second temperature-variable evaporator; 131: bypass line; 140: refrigeration evaporator; 141: refrigeration capillary tube; 150: freezing evaporator; 151: freezing capillary tube;

[0038] 200: solenoid valve assembly; 210: first solenoid valve; 220: second solenoid valve; 230: third solenoid valve. DETAILED DESCRIPTION

[0039] In order to be able to understand the features and technical contents of the embodiments of the present disclosure in more detail, the implementation of the embodiments of the present disclosure is described in detail below in conjunction with the accompanying drawings. The attached drawings are for reference only and are not used to limit the embodiments of the present disclosure. In the following technical description, for the convenience of explanation, a full understanding of the disclosed embodiments is provided through multiple details. However, one or more embodiments can still be implemented without these details. In other cases, to simplify the drawings, well-known structures and devices can be simplified for display.

[0040] The terms "first", "second", etc. in the specification and claims of the disclosed embodiments and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchanged where appropriate to describe the disclosed embodiments here. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions.

[0041] In the embodiments of the present disclosure, the terms "upper", "lower", "inside", "middle", "outside", "front", "back" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. These terms are mainly intended to better describe the embodiments of the present disclosure and their embodiments, and are not intended to limit the indicated devices, elements or components to have a specific direction, or to be constructed and operated in a specific direction. Moreover, in addition to being used to indicate directions or positional relationships, some of the above terms may also be used to indicate other meanings. For example, the term "upper" may also be used to indicate a certain dependency or connection relationship in certain circumstances. For those of ordinary skill in the art, the specific meanings of these terms in the embodiments of the present disclosure can be understood according to specific circumstances.

[0042] In addition, the terms "disposed", "connected", and "fixed" should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present disclosure can be understood according to specific circumstances.

[0043] Unless otherwise stated, the term "plurality" means two or more.

[0044] In the embodiment of the present disclosure, the character " / " indicates that the preceding and following objects are in an "or" relationship. For example, A / B indicates: A or B.

[0045] The term "and / or" is a description of the association relationship between objects, indicating that three relationships can exist. For example, A and / or B means: A or B, or, A and B.

[0046] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present disclosure may be combined with each other.

[0047] Combination Figure 1-4 As shown, the embodiment of the present disclosure provides a refrigerator, including a housing, a refrigeration cycle system and a solenoid valve assembly 200. The housing is provided with a temperature-changing chamber; Figure 1 As shown, the refrigerant circulation system includes a first temperature variable evaporator 120 and a second temperature variable evaporator 130, the first temperature variable evaporator 120 and the second temperature variable evaporator 130 are connected in series and arranged in the temperature variable room; and, a first capillary tube 121 and a second capillary tube 122 connected in parallel are arranged upstream of the first temperature variable evaporator 120, and the flow rates of the first capillary tube 121 and the second capillary tube 122 are different; the second temperature variable evaporator 130 is located downstream of the first temperature variable evaporator 120, and the flow rate of the second temperature variable evaporator 130 is different. Both ends are connected to the bypass line 131; the solenoid valve assembly 200 includes a first solenoid valve 210 and a second solenoid valve 220; wherein, the first solenoid valve 210 is arranged upstream of the first capillary tube 121, and is used to control the refrigerant to flow from the first capillary tube 121 or the second capillary tube 122 to the first temperature variable evaporator 120; the second solenoid valve 220 is arranged between the first temperature variable evaporator 120 and the second temperature variable evaporator 130, and is used to control the refrigerant to flow to the bypass line 131 or the second temperature variable evaporator 130.

[0048] In this embodiment, since the flow rates of the first capillary tube 121 and the second capillary tube 122 are different, when the first solenoid valve 210 is used to control the refrigerant to flow through the first capillary tube 121 and the second capillary tube 122 respectively, the evaporation temperature of the first temperature variable evaporator 120 is different. Here, when the refrigerant flows through the capillary with a larger flow rate, the evaporation temperature of the first temperature variable evaporator 120 is higher. The overall evaporation area of ​​the temperature variable chamber is equal to the sum of the evaporation areas of the first temperature variable evaporator 120 and the second temperature variable evaporator 130. Therefore, when the bypass line 131 is controlled by the second solenoid valve 220 to bypass the second temperature variable evaporator 130, the second temperature variable evaporator 130 no longer exchanges heat and its evaporation area is zero. At this time, the overall heat exchange area of ​​the temperature variable chamber is the smallest. In this way, when the temperature variable chamber is used as a cold storage chamber, the second solenoid valve 220 can be used to reduce the overall heat exchange area of ​​the temperature variable chamber, and the first solenoid valve 210 can be further used to increase the evaporation temperature of the first temperature variable evaporator 120. Therefore, the reduction in evaporation area is conducive to leaving more cooling capacity for other heat exchangers, and the outlet air temperature of the variable temperature chamber is also increased, which effectively improves the energy efficiency of the refrigerator.

[0049] Optionally, the flow rate of the first capillary 121 is greater than the flow rate of the second capillary 122; Figure 2 As shown, when the variable temperature chamber is used for refrigeration, the first solenoid valve 210 controls the refrigerant to flow from the first capillary tube 121 to the first temperature variable evaporator 120 , and the second solenoid valve 220 controls the refrigerant to flow to the bypass line 131 .

[0050] In this embodiment, when the variable temperature chamber is used for refrigeration, a very low evaporation temperature and a large amount of cold are not required to meet the refrigeration demand. Since the flow rate of the first capillary tube 121 is greater than the flow rate of the second capillary tube 122, when the first solenoid valve 210 controls the refrigerant to flow from the first capillary tube 121 to the first variable temperature evaporator 120, the evaporation temperature of the first variable temperature evaporator 120 is higher. In addition, when the second solenoid valve 220 controls the refrigerant to flow to the bypass line 131, the second variable temperature evaporator 130 no longer exchanges heat. In this way, the overall heat exchange area of ​​the variable temperature chamber is reduced, and the air outlet temperature of the variable temperature chamber is also increased. This not only meets the refrigeration demand, but also reduces the energy consumption of the refrigerator.

[0051] In this embodiment, the capillary tube is a commonly used throttling device in the refrigeration system. It is widely used in various refrigeration equipment because of its low price and flexible selection. The capillary tube is usually a copper tube with a relatively small inner diameter, which can be customized and adjusted according to the requirements of the refrigeration load. The capillary tube throttles and reduces the pressure of the high-pressure refrigerant liquid, so that the pressure of the refrigerant is reduced from the condensing pressure to the evaporation pressure, and at the same time controls the liquid supply of the evaporator. Therefore, using the capillary tube to control the flow rate of the refrigerant can effectively exert the efficiency of the evaporator.

[0052] Optionally, the first temperature variable evaporator 120 and the second temperature variable evaporator 130 are both direct cooling heat exchangers. The direct cooling evaporator has the advantages of simple structure and low cost. The direct cooling evaporator directly places the refrigeration pipe in the temperature variable chamber, absorbs heat directly from the food through the evaporation of the refrigerant, and thus achieves the purpose of cooling and preserving.

[0053] Optionally, the first variable temperature evaporator 120 and the second variable temperature evaporator 130 are both air-cooled heat exchangers. The air-cooled heat exchanger has the advantages of fast cooling speed and precise temperature control. And because of the air circulation method, the food is not easily contaminated by the refrigerant. The air-cooled heat exchanger places the refrigeration pipe on one side or the bottom of the refrigerator, draws air into the evaporator through the fan for cooling, and then blows the cold air into the variable temperature room through the cold air circulation, so as to achieve the purpose of cooling and preservation.

[0054] Optionally, the variable temperature chamber is provided with a variable temperature fan; when the variable temperature chamber is used for refrigeration, the rotation speed of the variable temperature fan is reduced.

[0055] In this embodiment, the variable temperature fan is arranged on one side of the first variable temperature evaporator 120 and the second variable temperature evaporator 130 to promote heat exchange between the air in the variable temperature chamber and the two variable temperature evaporators. When the variable temperature chamber is used for refrigeration, the refrigerant is controlled to flow from the first capillary tube 121 to the first variable temperature evaporator 120 by the first solenoid valve 210, and the refrigerant is controlled to flow to the bypass line 131 by the second solenoid valve 220. At this time, the air outlet temperature of the variable temperature chamber is relatively high, and by further reducing the speed of the variable temperature fan, power consumption and noise can be reduced.

[0056] Optionally, the flow rate of the first capillary 121 is greater than the flow rate of the second capillary 122; Figure 3 As shown, when the temperature variable chamber is used for refrigeration, the first solenoid valve 210 controls the refrigerant to flow from the second capillary tube 122 to the first temperature variable evaporator 120 , and the second solenoid valve 220 controls the refrigerant to flow to the second temperature variable evaporator 130 .

[0057] In this embodiment, when the variable temperature chamber is used for freezing, a lower evaporation temperature and a larger amount of cold are required to meet the freezing demand. Since the flow rate of the second capillary tube 122 is less than the flow rate of the first capillary tube 121, when the first solenoid valve 210 controls the refrigerant to flow from the second capillary tube 122 to the first variable temperature evaporator 120, the evaporation temperature of the first variable temperature evaporator 120 is lower. In addition, when the second solenoid valve 220 controls the refrigerant to flow to the second variable temperature evaporator 130, the second variable temperature evaporator 130 also performs heat exchange. In this way, the overall heat exchange area of ​​the variable temperature chamber is increased, and the temperature of the variable temperature chamber is rapidly reduced, thereby meeting the freezing demand.

[0058] Optionally, the first solenoid valve 210 is provided with two outlets, and the two outlets are respectively connected to the first capillary tube 121 and the second capillary tube 122 .

[0059] In this embodiment, the first solenoid valve 210 is a one-inlet and two-outlet solenoid valve. The first solenoid valve 210 can control the switch state of the two outlets. When the variable temperature room is used for refrigeration, the first solenoid valve 210 controls the opening connected to the first capillary tube 121 to be opened, and the opening connected to the second capillary tube 122 to be closed. When the variable temperature room is used for freezing, the first solenoid valve 210 controls the opening connected to the first capillary tube 121 to be closed, and the opening connected to the second capillary tube 122 to be opened.

[0060] Optionally, the second solenoid valve 220 is provided with two outlets, and the two outlets are respectively connected to the bypass line 131 and the second temperature variable evaporator 130 .

[0061] In this embodiment, the second solenoid valve 220 is a one-inlet and two-outlet solenoid valve. The second solenoid valve 220 can control the switch state of the two outlets. When the variable temperature room is used for refrigeration, the second solenoid valve 220 controls the opening connected to the bypass line 131 to be opened, and the opening connected to the second temperature variable evaporator 130 to be closed. When the variable temperature room is used for freezing, the second solenoid valve 220 controls the opening connected to the second temperature variable evaporator 130 to be opened, and the opening connected to the bypass line 131 to be closed.

[0062] Optionally, the casing is also provided with a refrigeration chamber, and the refrigerant circulation system further includes a refrigeration evaporator 140; the refrigeration evaporator 140 is arranged in the refrigeration chamber, and a refrigeration capillary 141 is provided upstream of the refrigeration evaporator 140; wherein the flow rate of the first capillary 121 is the same as the flow rate of the refrigeration capillary 141.

[0063] In this embodiment, when the variable temperature chamber is used for refrigeration, the first solenoid valve 210 controls the refrigerant to flow from the first capillary tube 121 to the first temperature variable evaporator 120. At this time, the evaporation temperature of the first temperature variable evaporator 120 is the temperature of the variable temperature chamber. The flow rate of the first capillary tube 121 is set to be the same as the flow rate of the refrigeration capillary tube 141, so that the temperature of the variable temperature chamber can be close to the temperature of the refrigeration chamber, so that the temperature of the variable temperature chamber meets the refrigeration requirements.

[0064] Optionally, the refrigeration evaporator 140 is arranged in parallel with the first temperature variable evaporator 120. Since the first temperature variable evaporator 120 is connected in series with the second temperature variable evaporator 130, the refrigeration evaporator 140 is also arranged in parallel with the second temperature variable evaporator 130.

[0065] Optionally, the casing is also provided with a freezing chamber, and the refrigerant circulation system further includes a freezing evaporator 150; the freezing evaporator 150 is arranged in the freezing chamber, and a freezing capillary 151 is provided upstream of the freezing evaporator 150; wherein the flow rate of the second capillary 122 is the same as the flow rate of the freezing capillary 151.

[0066] In this embodiment, when the variable temperature chamber is used for freezing, the first solenoid valve 210 controls the refrigerant to flow from the second capillary tube 122 to the first temperature variable evaporator 120, and the second solenoid valve 220 controls the refrigerant to flow to the second temperature variable evaporator 130. At this time, the first temperature variable evaporator 120 and the second temperature variable evaporator 130 simultaneously cool the variable temperature chamber. The flow rate of the second capillary tube 122 is set to be the same as the flow rate of the freezing capillary tube 151, so that the temperature of the variable temperature chamber can be close to the temperature of the freezing chamber, so that the temperature of the variable temperature chamber meets the freezing requirements.

[0067] Optionally, the freezing evaporator 150 and the first temperature variable evaporator 120 are arranged in series.

[0068] Optionally, the freezing capillary tube 151 and the first temperature variable evaporator 120 are arranged in parallel.

[0069] In this embodiment, the refrigerant circulation system further includes a compressor 100 and a condenser 110. After being compressed by the compressor 100, the refrigerant flows to the condenser 110. After being condensed in the condenser 110, the refrigerant flows to the refrigeration evaporator 140 via the refrigeration capillary tube 141, flows to the first temperature variable evaporator 120 via the first capillary tube 121 / flows to the first temperature variable evaporator 120 and the second evaporator via the second capillary tube 122 in sequence, and flows to the freezing evaporator 150 via the freezing capillary tube 151. In addition, the refrigerant of the refrigeration evaporator 140, the first temperature variable evaporator 120 and the second temperature variable evaporator 130 flows to the freezing evaporator 150. Finally, the refrigerant of the freezing evaporator 150 flows back to the compressor 100 for recompression.

[0070] Optionally, the solenoid valve assembly 200 further includes a third solenoid valve 230. The third solenoid valve 230 is provided with three outlets, and the three outlets are connected to the refrigeration capillary tube 141, the freezing capillary tube 151 and the inlet of the first solenoid valve 210 respectively.

[0071] In this embodiment, the third solenoid valve 230 can control the switch states of the three outlets, thereby controlling the use states of the refrigerating chamber, the freezing chamber, and the temperature-changing chamber. For example, when the temperature-changing chamber is in use, the third solenoid valve 230 controls the opening connected to the first solenoid valve 210 to be opened; when the temperature-changing chamber is not in use, the third solenoid valve 230 controls the opening connected to the first solenoid valve 210 to be closed. For another example, when the refrigerating chamber is in use, the third solenoid valve 230 controls the opening connected to the refrigerating capillary 141 to be opened; when the refrigerating chamber is not in use, the third solenoid valve 230 controls the opening connected to the refrigerating capillary 141 to be closed.

[0072] Optionally, the controller of the refrigerator is electrically connected to the first solenoid valve 210, the second solenoid valve 220 and the third solenoid valve 230, and the controller controls the states of the first solenoid valve 210, the second solenoid valve 220 and the third solenoid valve 230 according to the set temperature of the variable temperature chamber.

[0073] Exemplarily, the temperature-changing chamber is not in use, and the temperature-changing chamber is idle. Figure 4 As shown, the controller controls the opening of the third solenoid valve 230 connected to the first solenoid valve 210 to be closed, the controller controls the two openings of the first solenoid valve 210 to be closed, and the controller controls the two openings of the second solenoid valve 220 to be closed. In this way, the overall heat exchange area of ​​the variable temperature chamber is zero, reducing the waste of cooling capacity, so that more cooling capacity can be allocated to the refrigerating chamber and the freezing chamber.

[0074] In another exemplary embodiment, when the set temperature of the variable temperature chamber is -7 to 5°C, the variable temperature chamber is used for refrigeration. Figure 2 As shown, the controller controls the opening of the third solenoid valve 230 connected to the first solenoid valve 210 to open; the controller controls the opening of the first solenoid valve 210 connected to the first capillary 121 to open, and the opening connected to the second capillary 122 to close; the controller controls the opening of the second solenoid valve 220 connected to the bypass line 131 to open, and the opening connected to the second temperature variable evaporator 130 to close. In this way, the refrigerant flows from the first capillary 121 to the first temperature variable evaporator 120, and the evaporation temperature of the first temperature variable evaporator 120 is relatively high. In addition, the refrigerant flows to the bypass line 131, and the second temperature variable evaporator 130 no longer exchanges heat. At this time, the refrigerant flow direction of the refrigerant circulation system is: compressor 100, condenser 110, first temperature variable evaporator 120, freezing evaporator 150, compressor 100. In this way, the overall heat exchange area of ​​the temperature variable chamber is reduced, and the air outlet temperature of the temperature variable chamber is also increased. Therefore, it can not only meet the refrigeration needs, but also reduce the energy consumption of the refrigerator.

[0075] In another exemplary embodiment, when the set temperature of the variable temperature chamber is -20 to -8°C, the variable temperature chamber is used for freezing. Figure 3As shown, the controller controls the opening of the third solenoid valve 230 connected to the first solenoid valve 210 to open; the controller controls the opening of the first solenoid valve 210 connected to the second capillary 122 to open, and the opening connected to the first capillary 121 to close; the controller controls the opening of the second solenoid valve 220 connected to the second temperature-variable evaporator 130 to open, and the opening connected to the bypass line 131 to close. In this way, the refrigerant flows from the second capillary 122 to the first temperature-variable evaporator 120, and the evaporation temperature of the first temperature-variable evaporator 120 is relatively low. In addition, the refrigerant flows to the second temperature-variable evaporator 130, and the first temperature-variable evaporator 120 and the second temperature-variable evaporator 130 simultaneously refrigerate the temperature-variable room. At this time, the refrigerant flow direction of the refrigerant circulation system is: compressor 100, condenser 110, first temperature-variable evaporator 120, second temperature-variable evaporator 130, freezing evaporator 150, compressor 100. In this way, the overall heat exchange area of ​​the temperature-variable room is increased, so that the temperature of the temperature-variable room meets the freezing requirements.

[0076] The above description and the accompanying drawings sufficiently illustrate the embodiments of the present disclosure to enable those skilled in the art to practice them. Other embodiments may include structural and other changes. The embodiments represent only possible variations. Unless explicitly required, individual components and functions are optional, and the order of operations may vary. Portions and features of some embodiments may be included in or replace portions and features of other embodiments. The embodiments of the present disclosure are not limited to the structures described above and shown in the accompanying drawings, and various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A refrigerator, characterized in that: include: The casing is provided with a temperature-changing chamber; The refrigerant circulation system comprises a first temperature-variable evaporator (120) and a second temperature-variable evaporator (130), wherein the first temperature-variable evaporator (120) and the second temperature-variable evaporator (130) are connected in series and arranged in a temperature-variable chamber; and a first capillary tube (121) and a second capillary tube (122) connected in parallel are arranged upstream of the first temperature-variable evaporator (120), and the flow rates of the first capillary tube (121) and the second capillary tube (122) are different; the second temperature-variable evaporator (130) is located downstream of the first temperature-variable evaporator (120), and both ends of the second temperature-variable evaporator (130) are connected to a bypass pipeline (131); The solenoid valve assembly (200) comprises a first solenoid valve (210) and a second solenoid valve (220); wherein the first solenoid valve (210) is arranged upstream of the first capillary tube (121) and is used to control the refrigerant to flow from the first capillary tube (121) or the second capillary tube (122) to the first temperature variable evaporator (120); and the second solenoid valve (220) is arranged between the first temperature variable evaporator (120) and the second temperature variable evaporator (130) and is used to control the refrigerant to flow to the bypass line (131) or the second temperature variable evaporator (130).

2. The refrigerator according to claim 1, characterized in that: The flow rate of the first capillary tube (121) is greater than the flow rate of the second capillary tube (122); When the variable temperature chamber is used for refrigeration, the first solenoid valve (210) controls the refrigerant to flow from the first capillary tube (121) to the first variable temperature evaporator (120), and the second solenoid valve (220) controls the refrigerant to flow to the bypass line (131).

3. The refrigerator according to claim 2, characterized in that: The variable temperature room is equipped with a variable temperature fan; When the variable temperature room is used for refrigeration, the speed of the variable temperature fan is reduced.

4. The refrigerator according to claim 1, characterized in that: The flow rate of the first capillary tube (121) is greater than the flow rate of the second capillary tube (122); When the variable temperature chamber is used for refrigeration, the first solenoid valve (210) controls the refrigerant to flow from the second capillary tube (122) to the first variable temperature evaporator (120), and the second solenoid valve (220) controls the refrigerant to flow to the second variable temperature evaporator (130).

5. The refrigerator according to any one of claims 1 to 4, characterized in that: The casing is also provided with a refrigeration chamber, and the refrigerant circulation system further includes a refrigeration evaporator (140); the refrigeration evaporator (140) is arranged in the refrigeration chamber, and a refrigeration capillary tube (141) is arranged upstream of the refrigeration evaporator (140); The flow rate of the first capillary tube (121) is the same as the flow rate of the refrigeration capillary tube (141).

6. The refrigerator according to claim 5, characterized in that: The refrigeration evaporator (140) and the first temperature variable evaporator (120) are arranged in parallel.

7. The refrigerator according to any one of claims 1 to 4, characterized in that: The housing is also provided with a freezing chamber, and the refrigerant circulation system further includes a freezing evaporator (150); the freezing evaporator (150) is arranged in the freezing chamber, and a freezing capillary tube (151) is arranged upstream of the freezing evaporator (150); The flow rate of the second capillary tube (122) is the same as the flow rate of the freezing capillary tube (151).

8. The refrigerator according to claim 7, characterized in that: The freezing evaporator (150) and the first temperature variable evaporator (120) are arranged in series.

9. The refrigerator according to claim 7, characterized in that: The freezing capillary tube (151) and the first temperature variable evaporator (120) are arranged in parallel.

10. The refrigerator according to any one of claims 1 to 4, characterized in that: The first solenoid valve (210) is provided with two outlets, and the two outlets are respectively connected to the first capillary tube (121) and the second capillary tube (122); The second solenoid valve (220) is provided with two outlets, and the two outlets are respectively connected to the bypass pipeline (131) and the second temperature variable evaporator (130).

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