Refrigerating box

Abstract

The utility model provides a refrigerating box which comprises a box body, and further comprises a condenser, an expansion valve, a heat exchange assembly and a compressor which are sequentially connected in series to form a circulation loop, and further comprises a cold accumulation evaporator. The heat exchange assembly is arranged at the top of the box body and comprises a liquid inlet pipe, a plurality of heat exchange branch pipes and an air return pipe which are sequentially connected in series, and the heat exchange branch pipes are connected between the liquid inlet pipe and the air return pipe in parallel; the multiple cold storage evaporators are arranged on the top of the box body, the liquid inlet pipe and the air return pipe extend out of the box body, the liquid inlet end of the liquid inlet pipe is communicated with the expansion valve, and the air outlet end of the air return pipe is communicated with the compressor. According to the cold closet, cold air is diffused into the closet body through cold and hot air exchange, moisture in stored articles is prevented from being taken away by wind, and the storage quality is guaranteed; refrigerating media can be continuously supplied into the heat exchange assembly, and the cold storage evaporator can stably release cold.

Description

Technical Field

[0001] The utility model belongs to the technical field of storage equipment, and in particular relates to a cold storage box. Background Art

[0002] A refrigerator is a storage device that can store items that need to be stored at low temperatures (including fresh food, frozen food, medicine, and chemical materials) to prevent them from spoiling and being damaged. Existing refrigerators include a refrigeration unit (including a compressor, a copper tube evaporator, a condenser, and an expansion valve) and an insulation box. The copper tube evaporator is located at the bottom of the insulation box, and other components are located outside the insulation box. A refrigerant medium circulates inside the refrigeration unit. The compressor of the refrigeration unit compresses the refrigerant medium from gas to high-temperature and high-pressure gas; the condenser is used to condense the high-temperature and high-pressure gas compressed by the compressor into a low-temperature and high-pressure liquid; the expansion valve can convert the refrigerant medium into a low-temperature and low-pressure liquid by changing the channel area of ​​the refrigerant; the low-temperature and low-pressure refrigerant evaporates in the copper tube evaporator, taking away heat and cooling the insulation box; in addition, a high-power fan is provided next to the copper tube evaporator coil to blow the "cold" produced by the copper tube evaporator to various places in the insulation box.

[0003] However, this type of refrigerator will have the following problems during use: the copper tube evaporator is installed at the end wall of the insulation box. The air temperature close to the evaporator is low, and the temperature of the space far away from the evaporator is high, resulting in uneven hot and cold inside the insulation box, affecting the storage effect at different heights; the fan takes away moisture during operation, affecting the quality of vegetables or flowers, resulting in a high cargo loss rate. Utility Model Content

[0004] The utility model provides a refrigerator, aiming to solve the technical problems in the prior art that the copper tube evaporator affects the storage effect due to uneven temperature in the refrigerator, and the air supply from the fan causes moisture loss in the goods, affecting the quality of the goods.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0006] A cold storage box is provided, comprising a box body, and also comprising a condenser, an expansion valve, a heat exchange component and a compressor connected in series to form a circulation loop, and also comprising a cold storage evaporator; the heat exchange component is arranged on the top of the box body, and comprises a liquid inlet pipe, a heat exchange branch pipe and an air return pipe connected in series, wherein the heat exchange branch pipes are provided in plurality and are connected in parallel between the liquid inlet pipe and the air return pipe, each of the heat exchange branch pipes extends in parallel to a first direction of the top of the box body, and two adjacent heat exchange branch pipes are spaced apart along a second direction parallel to the top of the box body, and the second direction is perpendicular to the first direction; the liquid inlet pipe and the air return pipe extend out of the box body respectively, the liquid inlet end of the liquid inlet pipe is connected to the expansion valve, and the air outlet end of the air return pipe is connected to the compressor.

[0007] In a possible implementation, the heat exchange branch pipe includes a connecting pipe, a first branch pipe, a switching elbow pipe and a second branch pipe which are connected in sequence along the flow direction of the refrigerant medium; the liquid inlet end of the connecting pipe is connected to the liquid outlet end of the liquid inlet pipe, and the liquid outlet end of the second branch pipe is connected to the liquid inlet end of the return air pipe; the first branch pipe and the second branch pipe are both parallel to the first direction, and the first branch pipe, the switching elbow pipe and the second branch pipe cooperate to form a U-shaped pipe structure, the first branch pipe and the second branch pipe respectively pass through the cold storage evaporator, and the outer periphery of the first branch pipe and the outer periphery of the second branch pipe are respectively in contact with the phase change material in the cold storage evaporator.

[0008] In a possible implementation, the heat exchange component also includes a liquid separator, which has a liquid inlet and multiple liquid outlets, the liquid inlet is connected to the liquid outlet end of the liquid inlet pipe, and the liquid outlet corresponds one-to-one with the connecting pipe and is connected to the corresponding liquid inlet end of the connecting pipe.

[0009] In a possible implementation, the cold storage evaporator is a columnar structure with its long axis parallel to the first direction. The cold storage evaporator has two heat exchange channels extending along its long axis. The first branch pipe and the second branch pipe respectively pass through the corresponding heat exchange channels. The interior of the cold storage evaporator forms a storage space for phase change material.

[0010] In a possible implementation, the heat exchange assembly also includes a liquid collecting pipe, and the outer periphery of the liquid collecting pipe is provided with a plurality of mounting pipes arranged at intervals along the long axis direction of the liquid collecting pipe, and the inlet of the mounting pipe is connected to the liquid outlet end of the corresponding second branch pipe; an air outlet is opened on one end face of the liquid collecting pipe, and the air outlet is connected to the air inlet of the return air pipe.

[0011] In a possible implementation, a transition joint is provided between the connecting pipe and the first branch pipe, between the first branch pipe and the transition elbow pipe, between the transition elbow pipe and the second branch pipe, and between the second branch pipe and the installation pipe.

[0012] In a possible implementation, a mounting ring is provided on the top of the inner cavity of the box body, and the mounting ring is detachably mounted and fixed on the outer periphery of the cold storage evaporator.

[0013] In one possible implementation, the compressor is a dual-power compressor, which includes a first power unit, a second power unit, a dual-power conversion mechanism and a compressor body; the first power unit and the second power unit are respectively connected to the compressor body through the dual power conversion mechanism; the dual power conversion mechanism is provided with a dual power conversion switch, and the first power unit and the second power unit are selectively turned on through the dual power conversion switch.

[0014] In a possible implementation, the first power unit includes an electric motor, and the second power unit includes an internal combustion engine.

[0015] In a possible implementation, the liquid inlet end of the liquid inlet pipe and the gas outlet end of the gas return pipe are located on the same side of the box body.

[0016] The utility model provides a refrigerator in which the cold storage evaporator is arranged at the top of the inner wall of the box body, and the cold storage evaporator and the refrigerant medium in the heat exchange component undergo heat exchange. The refrigerant medium evaporates and absorbs heat, and the cold storage evaporator can slowly change phase and release cold. A plurality of cold storage evaporators are arranged at intervals, and can evenly cool the box body. The cold air and the hot air in the thermal insulation box undergo heat exchange, and the cold air can evenly descend, while the hot air rises and exchanges heat with the cold storage evaporator to become cold air, thereby reducing temperature fluctuations, achieving rapid cooling in the box body, and ensuring uniform temperature in the box body, and preventing the temperature of the space far away from the cold storage evaporator from being higher than the temperature around the cold storage evaporator. The cold air is diffused into the box body through forced convection heat exchange between cold and hot air, thereby eliminating the need for a fan, preventing moisture in the stored items from being carried away by the wind, and ensuring storage quality. The heat exchange component can continuously supply refrigerant medium, and the cold storage evaporator can stably release cold, thereby improving the stability of refrigeration. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0018] Figure 1 A schematic diagram of the structure of a refrigerator provided by an embodiment of the utility model;

[0019] Figure 2 It is a schematic diagram of the assembly of the heating pipeline and the cold storage evaporator used in the embodiment of the utility model;

[0020] Figure 3 This is a cross-sectional view of the cold storage evaporator used in the embodiment of the utility model.

[0021] Description of reference numerals:

[0022] 1. Box body; 11. Mounting ring;

[0023] 2. Condenser;

[0024] 3. Expansion valve;

[0025] 4. Compressor;

[0026] 5. Heat exchange assembly; 51. Liquid inlet pipe; 52. Heat exchange branch pipe; 521. Connecting pipe; 522. First branch pipe; 523. Adapter elbow; 524. Second branch pipe; 53. Air return pipe; 54. Liquid distributor; 55. Liquid collecting pipe; 551. Installation pipe; 56. Adapter joint;

[0027] 6. Cold storage evaporator; 61. Phase change material. DETAILED DESCRIPTION

[0028] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0029] It should be noted that the terms "length", "width", "height", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "head", "tail", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model.

[0030] It should also be noted that, unless otherwise clearly specified and limited, the terms such as "install", "connect", "connect", "fix", "set" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In addition, the meaning of "multiple" and "several" is two or more, unless otherwise clearly and specifically defined.

[0032] Please also read Figures 1 to 3, the refrigerator provided by the utility model is now described. The refrigerator includes a box body 1, and also includes a condenser 2, an expansion valve 3, a heat exchange component 5 and a compressor 4 connected in series to form a circulation loop, and also includes a cold storage evaporator 6; the heat exchange component 5 is arranged at the top of the box body 1, and includes a liquid inlet pipe 51, a heat exchange branch pipe 52 and a return air pipe 53 connected in series, wherein a plurality of heat exchange branch pipes 52 are provided and connected in parallel between the liquid inlet pipe 51 and the return air pipe 53, each heat exchange branch pipe 52 extends parallel to a first direction at the top of the box body 1, and two adjacent heat exchange branch pipes 52 are spaced apart along a second direction parallel to the top of the box body 1, and the second direction is perpendicular to the first direction; the liquid inlet pipe 51 and the return air pipe 53 extend out of the box body 1 respectively, the liquid inlet end of the liquid inlet pipe 51 is connected to the expansion valve 3, and the gas outlet end of the return air pipe 53 is connected to the compressor 4.

[0033] It should be noted that the long axis of the heat exchange branch pipe 52 is parallel to the length direction of the box body 1 , and the plurality of heat exchange branch pipes 52 are arranged at intervals along the width direction of the box body 1 .

[0034] It should be noted that the cold storage evaporator 6 contains a phase change material 61, and the phase change material 61 can be Freon, or wax, salt, and hydrate.

[0035] The refrigeration principle provided by this embodiment is: the compressor 4 compresses the refrigerant medium into a high-temperature and high-pressure gas and transports it to the condenser 2; the high-temperature and high-pressure refrigerant medium condenses and releases heat in the condenser 2 and is converted into a low-temperature and high-pressure liquid; the low-temperature and high-pressure refrigerant medium is converted into a low-temperature and low-pressure liquid through the expansion valve 3; the low-temperature and low-pressure refrigerant medium evaporates and absorbs heat in the cold storage evaporator 6, cooling the phase change material 61, causing the phase change material 61 to change phase and store energy; the phase change material slowly changes phase and releases cold, exchanges heat with the air in the box body 1 through the outer shell of the cold storage evaporator 6, forcing the hot air to rise, thereby cooling the insulation box.

[0036] The refrigeration box provided in the present embodiment is compared with the prior art. The cold storage evaporator 6 is arranged at the top of the inner wall of the box body 1. The cold storage evaporator 6 and the refrigerant medium in the heat exchange component 5 undergo heat exchange. The refrigerant medium evaporates and absorbs heat. The cold storage evaporator 6 can slowly change phase and release cold. A plurality of cold storage evaporators 6 are arranged at intervals, and can evenly cool the box body 1. The cold air and the hot air in the insulation box undergo heat exchange. The cold air can evenly descend, and the hot air rises and exchanges heat with the cold storage evaporator 6 to become cold air, thereby reducing the temperature fluctuation, achieving rapid cooling in the box body 1, and ensuring the uniform temperature in the box body 1. The temperature of the space far away from the cold storage evaporator 6 will not be higher than the temperature around the cold storage evaporator 6. The cold air is diffused into the box body 1 through forced convection heat exchange between cold and hot air, eliminating the need for a fan, preventing moisture in the stored items from being carried away by the wind, and ensuring the storage quality. The heat exchange component 5 can continuously supply refrigerant medium, and the cold storage evaporator 6 can stably release cold, thereby improving the stability of refrigeration.

[0037] In some embodiments, see Figure 2 The heat exchange branch pipe 52 includes a connecting pipe 521, a first branch pipe 522, a transfer elbow pipe 523 and a second branch pipe 524 which are connected in sequence along the flow direction of the refrigerant medium; the liquid inlet end of the connecting pipe 521 is connected to the liquid outlet end of the liquid inlet pipe 51, and the liquid outlet end of the second branch pipe 524 is connected to the liquid inlet end of the return air pipe 53; the first branch pipe 522 and the second branch pipe 524 are both parallel to the first direction, and the first branch pipe 522, the transfer elbow pipe 523 and the second branch pipe 524 cooperate to form a U-shaped pipe structure, the first branch pipe 522 and the second branch pipe 524 respectively penetrate the cold storage evaporator 6, and the outer periphery of the first branch pipe 522 and the outer periphery of the second branch pipe 524 are respectively in contact with the phase change material 61 in the cold storage evaporator 6. The connecting pipe 521 facilitates the connection between the first branch pipe 522 and the liquid inlet pipe 51, guides the flow of the refrigerant, and the first branch pipe 522 and the second branch pipe 524 are inserted into the cold storage evaporator 6 for evaporation and heat absorption to realize the cold release of the phase change material 61. The switching elbow 523 can connect the first branch pipe 522 and the second branch pipe 524, so that the refrigerant can flow through the first branch pipe 522 and the second branch pipe 524 in sequence, so that the flow medium of the refrigerant changes. The connecting pipe 521, the first branch pipe 522, the switching elbow 523 and the second branch pipe 524 are connected in sequence, which can guide the refrigerant to flow at the top of the box body 1, and ensure the uniformity of the cold release of the phase change material 61.

[0038] In some embodiments, see Figure 2 The heat exchange assembly 5 further includes a liquid separator 54, which has a liquid inlet and multiple liquid outlets, wherein the liquid inlet is connected to the liquid outlet end of the liquid inlet pipe 51, and the liquid outlets correspond to the connecting pipes 521 one by one and are connected to the liquid inlet ends of the corresponding connecting pipes 521. The liquid separator 54 can divert the refrigerant so that the refrigerant can enter different first branch pipes 522 at the same time, ensuring that the refrigerant flows evenly at the top of the box 1, thereby making the cold release positions of the phase change material 61 evenly distributed at the top of the box 1, improving the uniformity of cold release, and ensuring that the cold air in the box 1 is evenly distributed.

[0039] In some embodiments, see Figure 3 The cold storage evaporator 6 is a columnar structure, and its long axis is parallel to the first direction. The cold storage evaporator 6 has two heat exchange channels along its long axis. The first branch pipe 522 and the second branch pipe 524 respectively penetrate the corresponding heat exchange channels, and the interior of the cold storage evaporator 6 forms a storage space for the phase change material 61. The cold storage evaporator 6 is evenly filled with the phase change material 61, so that the phase change material 61 covers the outer periphery of the first branch pipe 522 and the second branch pipe 524, thereby improving the heat exchange efficiency.

[0040] During specific implementation, the heat exchange channel is arranged in the accommodating space.

[0041] In some embodiments, see Figure 2 The heat exchange assembly 5 also includes a liquid collecting pipe 55. The outer periphery of the liquid collecting pipe 55 is provided with a plurality of installation pipes 551 arranged at intervals along its long axis direction. The inlet of the installation pipe 551 is connected with the liquid outlet end of the corresponding second branch pipe 524. An air outlet is provided at one end face of the liquid collecting pipe 55, and the air outlet is connected with the air inlet of the return pipe 53. The liquid collecting pipe 55 can collect the refrigerant in the first branch pipe 522 and the second branch pipe 524, and move it from the air outlet to the return pipe 53. The collected refrigerant is then transported from the return pipe 53 to the compressor 4, completing a cycle, ensuring that the refrigerant can circulate continuously, so that the cold storage evaporator 6 can continuously cool, and the storage effect in the box 1 is ensured.

[0042] In some embodiments, see Figure 2 , an adapter joint 56 is provided between the connecting pipe 521 and the first branch pipe 522, between the first branch pipe 522 and the adapter elbow 523, between the adapter elbow 523 and the second branch pipe 524, and between the second branch pipe 524 and the installation pipe 551. The adapter joint 56 can connect two adjacent pipes to ensure smooth circulation of the refrigerant medium. Specifically, the adapter joint 56 is a rotary joint.

[0043] In some embodiments, referring to the figure, a mounting ring 11 is provided at the top of the inner cavity of the box body 1, and the mounting ring 11 is detachably mounted and fixed on the outer periphery of the cold storage evaporator 6. The cold storage evaporator 6 can be fixed on the inner ring of the mounting ring 11, thereby improving the structural stability.

[0044] As another embodiment of fixing the housing 1 and the cold storage evaporator 6, a mounting groove is provided on the top of the inner cavity of the housing 1, the outer periphery of the cold storage evaporator 6 is snap-fitted with the mounting groove, and the bottom end of the cold storage evaporator 6 protrudes from the mounting groove.

[0045] In some embodiments, the compressor 4 is a dual-power compressor 4, which includes a first power unit, a second power unit, a dual-power conversion mechanism and a compressor 4 body; the first power unit and the second power unit are respectively connected to the compressor 4 body through the dual-power conversion mechanism; the dual-power conversion mechanism is provided with a dual-power conversion switch, and the first power unit and the second power unit are selectively turned on through the dual-power conversion switch. The compressor 4 has a dual power source, and different power units can be selected during transportation and storage. The setting of the first power unit and the second power unit reduces the limitations of the use of the refrigerator.

[0046] In specific implementation, the dual power conversion mechanism includes a transmission gearbox, a flexible coupling and a diaphragm coupling; the first power unit and the second power unit are connected to the same gearbox through the flexible coupling and the diaphragm coupling respectively with the dual power conversion switch. The dual power conversion mechanism is based on configuring two input ends and one output end on the same gearbox, and selecting one of the power modes to work through the dual power conversion switch.

[0047] In some embodiments, the first power unit includes an electric motor, and the second power unit includes an internal combustion engine. The electric motor uses electricity as a power source, and the internal combustion engine uses fuel as a power source. When there is market electricity, the electric motor is selected as the power source. During the transportation of the refrigerated box, the internal combustion engine is selected as the power source, which improves the environmental adaptability of the refrigerated box, makes the working environment more extensive, and reduces the limitations of the refrigerated box.

[0048] In some embodiments, see Figure 1 and Figure 2 The liquid inlet end of the liquid inlet pipe 51 and the gas outlet end of the gas return pipe 53 are located on the same side of the housing 1. The liquid inlet end of the liquid inlet pipe 51 and the gas outlet end of the gas return pipe 53 are located on the same side, which can reduce the use of pipelines, shorten the flow path of the refrigerant medium, and reduce the area of ​​the pipeline exposed to the outside, thereby improving the protection effect of the pipeline.

[0049] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A refrigerator, comprising a box body, characterized in that: It also includes a condenser, an expansion valve, a heat exchange component and a compressor connected in series to form a circulation loop, and also includes a cold storage evaporator; the heat exchange component is arranged at the top of the box body, and includes a liquid inlet pipe, a heat exchange branch pipe and an air return pipe connected in series, wherein the heat exchange branch pipes are provided in plurality and are connected in parallel between the liquid inlet pipe and the air return pipe, each of the heat exchange branch pipes extends in parallel to a first direction of the top of the box body, and two adjacent heat exchange branch pipes are spaced apart along a second direction parallel to the top of the box body, and the second direction is perpendicular to the first direction; the cold storage evaporator is provided in plurality and is respectively arranged at the top of the box body, and the heat exchange branch pipes pass through the corresponding cold storage evaporator; the liquid inlet pipe and the air return pipe extend out of the box body respectively, the liquid inlet end of the liquid inlet pipe is connected to the expansion valve, and the air outlet end of the air return pipe is connected to the compressor.

2. The refrigerator as claimed in claim 1, characterized in that: The heat exchange branch pipe includes a connecting pipe, a first branch pipe, a switching elbow pipe and a second branch pipe which are connected in sequence along the flow direction of the refrigerant medium; the liquid inlet end of the connecting pipe is connected to the liquid outlet end of the liquid inlet pipe, and the liquid outlet end of the second branch pipe is connected to the liquid inlet end of the return air pipe; the first branch pipe and the second branch pipe are both parallel to the first direction, and the first branch pipe, the switching elbow pipe and the second branch pipe cooperate to form a U-shaped pipe structure, the first branch pipe and the second branch pipe respectively pass through the cold storage evaporator, and the outer periphery of the first branch pipe and the outer periphery of the second branch pipe are respectively in contact with the phase change material in the cold storage evaporator.

3. The refrigerator as claimed in claim 2, characterized in that: The heat exchange component also includes a liquid separator, which has a liquid inlet and multiple liquid outlets. The liquid inlet is connected to the liquid outlet end of the liquid inlet pipe, and the liquid outlets correspond to the connecting pipes one by one and are connected to the corresponding liquid inlet ends of the connecting pipes.

4. The refrigerator as claimed in claim 2, characterized in that: The cold storage evaporator is a columnar structure, and its long axis is parallel to the first direction. The cold storage evaporator has two heat exchange channels running through it along its long axis. The first branch pipe and the second branch pipe respectively pass through the corresponding heat exchange channels, and the interior of the cold storage evaporator forms a storage space for the phase change material.

5. The refrigerator as claimed in claim 2, characterized in that: The heat exchange component also includes a liquid collecting pipe, the outer periphery of which is provided with a plurality of mounting pipes arranged at intervals along the long axis direction of the liquid collecting pipe, the inlet of the mounting pipe is connected with the liquid outlet end of the corresponding second branch pipe; an air outlet is opened on one end face of the liquid collecting pipe, and the air outlet is connected with the air inlet of the return air pipe.

6. The refrigerator as claimed in claim 5, characterized in that: Adapter joints are provided between the connecting pipe and the first branch pipe, between the first branch pipe and the adapter elbow pipe, between the adapter elbow pipe and the second branch pipe, and between the second branch pipe and the installation pipe.

7. The refrigerator as claimed in claim 2, characterized in that: A mounting ring is provided on the top of the inner cavity of the box body, and the mounting ring is detachably mounted and fixed on the outer periphery of the cold storage evaporator.

8. The refrigerator as claimed in claim 1, characterized in that: The compressor is a dual-power compressor, which includes a first power unit, a second power unit, a dual-power conversion mechanism and a compressor body; the first power unit and the second power unit are respectively connected to the compressor body through the dual power conversion mechanism; the dual power conversion mechanism is provided with a dual power conversion switch, and the first power unit and the second power unit are selectively turned on through the dual power conversion switch.

9. The refrigerator as claimed in claim 8, characterized in that: The first power unit includes an electric motor and the second power unit includes an internal combustion engine.

10. The refrigerator as claimed in claim 1, characterized in that: The liquid inlet end of the liquid inlet pipe and the gas outlet end of the gas return pipe are located on the same side of the box body.

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