Refrigeration house indoor unit, refrigeration house air conditioner and refrigeration house system

Abstract

The utility model provides a refrigeration house indoor unit, refrigeration house air conditioner and refrigeration house system.The refrigeration house indoor unit comprises a first case, a first heat exchanger, a fan unit and a fan cover, the first case is provided with a first air outlet and a first return air inlet, and the first heat exchanger is arranged in the first case and between the first air outlet and the first return air inlet; the fan unit comprises a mounting frame, a motor and fan blades, the mounting frame is mounted in the first case and located between the first heat exchanger and the first air outlet, the motor is mounted on the mounting frame, the fan blades are mounted on a motor shaft of the motor, the motor drives the fan blades to supply air to the first air outlet, and the fan cover is mounted at the first air outlet. The refrigeration house air conditioner is provided with the refrigeration house indoor unit, the refrigeration house system is provided with the refrigeration house air conditioner, and the refrigeration house air conditioner has the advantages of being low in cost, light in weight and low in noise.

Description

Technical Field

[0001] The utility model relates to the technical field of cold storage, in particular to a cold storage internal machine, a cold storage air conditioner provided with the cold storage internal machine, and a cold storage system provided with the cold storage air conditioner. Background Art

[0002] Cold storage systems are mainly used to store items with specific temperature and humidity requirements. Compared with traditional refrigerators, cold storage systems have greater cooling capacity and storage space, and are widely used in food, chemical, medical, scientific experiments and other fields. There are two main types of existing cold storage systems:

[0003] The first method is to install cooling pipes in the warehouse to cool the warehouse through heat exchange between the cooling pipes and the air in the warehouse. Figure 1 and Figure 2 As shown, the cold discharge pipe 91 is arranged on the top of the warehouse 92, and a corresponding fan 93 is set to increase the air flow in the warehouse 91, so that the air in the warehouse 91 and the cold discharge pipe 91 can fully exchange heat. However, this solution usually requires the arrangement of a special drainage system so that when the cold discharge pipe 91 is defrosted, the water formed by defrosting can be discharged from the warehouse 92, and the refrigeration system of the cold storage system needs to be controlled to stop running during defrosting to wait for the frost on the cold discharge pipe 91 to melt naturally. For example, Figure 3 As shown, the cold discharge pipe 94 can be arranged on at least one side wall 951 in the warehouse 95. This arrangement does not require a fan, but when defrosting the cold discharge pipe 94, it is also necessary to control the refrigeration system of the cold storage system to stop operating to wait for the frost on the cold discharge pipe 94 to melt naturally.

[0004] The second type, such as Figure 4 and Figure 5 As shown, a cold storage machine 97 is arranged in the warehouse 96, and the cold storage machine 97 generally includes a chassis 971, a heat exchanger and a fan unit 972. The chassis 971 is provided with an air outlet, the heat exchanger is arranged in the chassis 971, and the fan unit 973 is installed on the air outlet. The fan unit 973 is used to blow air into the warehouse 96 to blow the cold air formed by the heat exchange of the heat exchanger into the warehouse 96. This solution can better solve the problem that the refrigeration system needs to stop running to wait for the frost to melt naturally when the first cold storage system is defrosted. However, the disadvantage of this solution is that the motor 9721 of the fan unit 972 is integrated on the mesh cover 9722, resulting in high production and maintenance costs of the cold storage machine 97, and the cold storage machine 97 is heavy, and the noise and vibration are large during operation. Summary of the invention

[0005] In order to solve the above problems, the main purpose of the utility model is to provide a cold storage internal machine with low cost, light weight and low noise.

[0006] Another object of the utility model is to provide a cold storage air conditioner equipped with the cold storage internal unit.

[0007] Another object of the present utility model is to provide a cold storage system equipped with the cold storage air conditioner.

[0008] In order to achieve the main purpose of the utility model, the utility model provides a cold storage internal machine, including a first chassis and a first heat exchanger, the first chassis is provided with a first air outlet and a first return air outlet, the first heat exchanger is arranged in the first chassis and between the first air outlet and the first return air outlet, wherein the cold storage internal machine also includes a fan unit and a fan cover, the fan unit includes a mounting frame, a motor and fan blades, the mounting frame is installed in the first chassis, the mounting frame is located between the first heat exchanger and the first air outlet, the motor is installed on the mounting frame, the fan blades are installed on the motor shaft of the motor, the motor drives the fan blades to supply air to the first air outlet, and the fan cover is installed at the first air outlet.

[0009] It can be seen from the above that the design of the cold storage internal machine makes it more convenient to repair the cold storage internal machine, and the production cost and maintenance cost are lower; in addition, it is also beneficial to reduce the weight of the cold storage internal machine, reduce the vibration generated when the cold storage internal machine is working, and reduce the noise generated when the cold storage internal machine is working.

[0010] A preferred solution is that the first heat exchanger includes a plurality of first fins and a first heat exchange tube, the plurality of first fins are arranged side by side along the length direction of the first chassis, and the first heat exchange tube passes through the first fins and is in a winding shape.

[0011] It can be seen from the above that the above design is conducive to improving the heat exchange effect of the first heat exchanger.

[0012] A further solution is that the spacing between two adjacent first fins is less than or equal to 2 mm; and the rotation speed of the motor is between 600 rpm and 3000 rpm.

[0013] It can be seen from the above that, through the design of the fin spacing, the overall volume of the first heat exchanger can be reduced by more than half while meeting the same required heat exchange area, which is beneficial to reducing the volume of the machine in the cold storage and improving the utilization rate of the warehouse.

[0014] A further solution is that the rotation speed of the motor is between 700 rpm and 1000 rpm.

[0015] It can be seen from the above that by further designing the motor speed, the wind noise and energy consumption can be reduced while meeting the refrigeration needs.

[0016] Another preferred solution is that the first chassis is provided with a slot group at the first air outlet, the fan cover is located outside the first chassis, the fan cover is provided with a buckle group, and the buckle group passes through the slot group and is engaged with the slot group.

[0017] As can be seen from the above, this design makes the assembly between the fan cover and the first chassis more convenient and easier to operate.

[0018] Another preferred solution is that the fan cover has multiple guide strips, and the guide strips have guide surfaces; the fan cover is made of polyethylene, polypropylene, polytetrafluoroethylene, polyamide or polyetheretherketone material; the mounting frame has a main body, a first connecting part, a second connecting part and an overlapping part, the motor is installed on the main body, the first connecting part and the overlapping part are located at the top of the main body, the first connecting part is connected to the first chassis, the second connecting part is located at the bottom of the main body, the second connecting part is connected to the first chassis, the overlapping part has a connecting section, a first elastic segment and a second elastic segment, the connecting section is connected between the first elastic segment and the second elastic segment, a clamping position is formed between the connecting section, the first elastic segment and the second elastic segment, and the first heat exchanger is clamped in the clamping position.

[0019] As can be seen from the above, this design enables the fan cover to better evenly discharge the wind blown out by the fan unit into the warehouse; and the fan cover has the advantages of light weight and low temperature resistance, which is more conducive to reducing the weight of the machine in the cold storage; and through the design of the mounting frame, the mounting frame can be reliably connected to the first chassis.

[0020] Another preferred solution is that the fan blades are made of polyethylene, polypropylene, polytetrafluoroethylene, polyamide or polyetheretherketone.

[0021] As can be seen from the above, this design makes the fan blades have the advantages of light weight and low temperature resistance, which is more conducive to reducing the weight of the machine inside the cold storage.

[0022] A further solution is that the number of first air outlets is between 1 and 8; the number of fan units is between 1 and 8, and one fan unit is matched with one first air outlet; the number of fan covers is between 1 and 8, and one fan cover is matched with one first air outlet; a first shock-absorbing element is provided between the mounting frame and the first chassis, and a second shock-absorbing element is provided between the mounting frame and the motor.

[0023] As can be seen from the above, the number of the first air outlets can be adjusted accordingly according to the size of the warehouse, so as to meet the refrigeration needs in the warehouse while using fewer cold storage units and reduce the space occupied by the cold storage units. The design of the first shock-absorbing element and the second shock-absorbing element can absorb the vibration generated when the fan unit is working, so as to further reduce the vibration and noise generated during the operation of the cold storage units.

[0024] In order to achieve another purpose of the utility model, the utility model provides a cold storage air conditioner, including a cold storage outdoor unit, the cold storage outdoor unit includes a second chassis, a second heat exchanger, a compressor, an expansion valve, a four-way valve and an outdoor fan, the second chassis has a second air outlet and a second return air outlet, the second heat exchanger is arranged in the second chassis and is located between the second air outlet and the second return air outlet, the compressor, the expansion valve and the four-way valve are all arranged in the second chassis, the air outlet of the compressor is connected to the input port of the four-way valve, the air return port of the compressor is connected to the output port of the four-way valve, the first connection of the second heat exchanger The connector is connected to the first interface of the expansion valve, the second connector of the second heat exchanger is connected to the first transfer port of the four-way valve, the outdoor fan is arranged in the second chassis and is located between the second heat exchanger and the second air outlet, wherein the cold storage air conditioner also includes the above-mentioned cold storage indoor unit, the first connector of the first heat exchanger is connected to the second transfer port of the four-way valve, and the second connector of the first heat exchanger is connected to the second interface of the expansion valve; when the air outlet is connected to the first transfer port, the return air port is connected to the second transfer port; when the air outlet is connected to the second transfer port, the return air port is connected to the first transfer port.

[0025] As can be seen from the above, the cold storage air conditioner equipped with the above-mentioned cold storage internal unit is more convenient to repair the cold storage internal unit, and the production cost and maintenance cost are lower; at the same time, since the vibration generated by the cold storage internal unit when working is smaller than that of the existing cold storage internal unit, the noise in the warehouse is also relatively small.

[0026] In order to achieve another purpose of the utility model, the utility model provides a cold storage system, including a storehouse, wherein the cold storage system also includes the above-mentioned cold storage air conditioner, the cold storage internal unit is installed in the storehouse, and the cold storage external unit is arranged outside the storehouse.

[0027] As can be seen from the above, the cold storage system is equipped with the above-mentioned cold storage air conditioner, which makes it more convenient to repair the cold storage machine, and the production cost and maintenance cost are lower; at the same time, since the vibration generated by the cold storage machine when working is smaller than that of the existing cold storage machine, the noise in the warehouse is also relatively small. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 The first cold storage system available.

[0029] Figure 2 An exploded view of the existing first type of cold storage system with some components omitted.

[0030] Figure 3 A cross-sectional view of the second existing cold storage system.

[0031] Figure 4 A cross-sectional view of a third existing cold storage system.

[0032] Figure 5 The structural diagram of the cold storage internal machine of the existing third cold storage system.

[0033] Figure 6 It is a structural diagram of an embodiment of a cold storage internal machine of the utility model.

[0034] Figure 7 It is a structural diagram after the first omitted part of an embodiment of a cold storage internal machine of the utility model.

[0035] Figure 8 It is an exploded view of an embodiment of a cold storage internal machine of the utility model.

[0036] Fig. 9 It is a cross-sectional view of an embodiment of a cold storage internal machine of the utility model.

[0037] Fig.10 It is a partial structural diagram of the first heat exchanger of the cold storage internal machine embodiment of the utility model.

[0038] Fig.11 yes Fig. 9 Enlarged view of point A in the middle.

[0039] Fig.12 The structural diagram after the second omitted part of the cold storage internal machine embodiment.

[0040] Fig.13 yes Fig.12 Enlarged view of point B in the middle.

[0041] The present invention will be further described below with reference to the accompanying drawings and embodiments. DETAILED DESCRIPTION

[0042] Cold storage internal machine embodiment

[0043] Combination Figures 6 to 9 The cold storage internal machine 100 includes a first machine box 1, a first heat exchanger 2, a fan unit 3 and a fan cover 4. The first heat exchanger 2 and the fan unit 3 are arranged in the first machine box 1, and the fan cover 4 is installed on the first machine box 1.

[0044] The first case 1 is provided with a first air outlet 11 and a first air return port 12, wherein the first air outlet 11 and the first air return port 12 are preferably distributed along the thickness direction of the first case 1. In addition, a water receiving pan 13 is provided at the bottom of the first case 1, and the water receiving pan 13 is used to receive the condensed water dripping from the first heat exchanger 2, and cooperate with the drain pipe to discharge the condensed water outside the warehouse, so that there is no need to lay relevant condensed water discharge pipes in the warehouse, making the installation of the cold storage internal machine 100 simpler and more convenient.

[0045] The first heat exchanger 2 is located between the first air outlet 11 and the first air return inlet 12, so that the air in the storage room can sequentially pass through the first air return inlet 12, the first heat exchanger 2 and the first air outlet 11 to realize the cyclic refrigeration for the control in the storage room. Among them, the first heat exchanger 2 is used for heat exchange with the air in the storage room, so that the air flowing through the first heat exchanger 2 becomes cold air with a low temperature. In addition, the first heat exchanger 2 is located above the water receiving tray 13, so that the condensed water condensed by the first heat exchanger 2 can drip into the water receiving tray 13 and be discharged outside the storage room.

[0046] Combined with Fig.10 , the first heat exchanger 2 includes a plurality of first fins 21 and a first heat exchange tube 22. The plurality of first fins 21 are arranged side by side along the length direction of the first chassis 1. The first heat exchange tube 22 penetrates through the first fins 21, and the first heat exchange tube 22 is in a meandering shape to increase the contact area between the first heat exchange tube 22 and the fins, thereby improving the heat exchange effect between the first heat exchanger 2 and the air in the storage room. Preferably, the distance w between two adjacent first fins 21 is less than or equal to 2 millimeters; more preferably, the distance w between two adjacent first fins 21 is 2 millimeters. Through the design of the distance w between adjacent first fins 21, the overall volume of the first heat exchanger 2 can be reduced by more than one time under the condition of meeting the same required heat exchange area, which is beneficial to reducing the volume of the indoor unit 100 of the cold storage and improving the utilization rate of the storage room.

[0047] The fan unit 3 includes a mounting frame 31, a motor 32 and a fan blade 33, which are installed in the first chassis 1, and the mounting frame 31 is located in front of the first heat exchanger 2 and the first air outlet 11; the mounting frame 31 preferably has a main body 311, a first connecting portion 312, a second connecting portion 313 and a lapping portion 314. The first connecting portion 312 and the lapping portion 314 are located at the top of the main body 311, and the first connecting portion 312 is used for connecting with the first chassis 1; the second connecting portion 313 is located at the bottom of the main body 311, and the second connecting portion 313 is used for connecting with the chassis. The lapping portion 314 is used for connecting with the first heat exchanger 2. Preferably, as Fig.11 shown, the lapping portion 314 has a connecting section 3141, a first elastic section 3142 and a second elastic section 3143. The connecting section 3141 is connected between the first elastic section 3142 and the second elastic section 3143, and the connecting section 3141, the first elastic section 3142 and the second elastic section 3143 are substantially in an inverted "U" shape, so that a clamping position is formed between the connecting section 3141, the first elastic section 3142 and the second elastic section 3143; when the lapping portion 314 is assembled with the first heat exchanger 2, the first heat exchanger 2 is clamped in the clamping position. Through the structural design of the mounting frame 31, the mounting frame 31 can be stably and reliably connected with the first chassis 1 and the first heat exchanger 2, and the first heat exchanger 2 can be stably and reliably installed in the first chassis 1.

[0048] The motor 32 is mounted on the main body 311 of the mounting frame 31, and the fan blade 33 is mounted on the motor shaft of the motor 32, so that the motor 32 can drive the fan blade 33 to supply air to the first air outlet 11, and is mounted at the first air outlet 11. Through the design of the fan unit 3, it is more convenient to repair the cold storage machine 100, and the production cost and maintenance cost are lower, and it is also beneficial to reduce the weight of the cold storage machine 100, reduce the vibration generated when the cold storage machine 100 is working, and reduce the noise generated when the cold storage machine 100 is working. Preferably, a first shock absorbing element is provided between the mounting frame 31 and the first chassis 1, and / or a second shock absorbing element is provided between the mounting frame 31 and the motor 32. The first shock absorbing element and the second shock absorbing element can absorb the vibration generated when the fan unit 3 is working, so as to further reduce the vibration and noise generated during the operation of the cold storage machine 100; wherein, the first shock absorbing element and the second shock absorbing element can preferably adopt shock absorbing rubber pads, shock absorbing sponge pads, etc.

[0049] In addition, the fan blades 33 are preferably made of low-temperature resistant materials, such as polyethylene (PE), polypropylene (PP), polytetrafluoroethylene (PRFE), polyamide (PA) or polyetheretherketone (PEEK) materials, so that the fan blades 33 are light and can be better applied to the low temperature and ultra-low temperature environment in the warehouse, so as to ensure the service life and working reliability of the fan blades 33, and at the same time, it is also beneficial to further reduce the weight of the cold storage internal machine 100.

[0050] Furthermore, the speed of the motor 32 is preferably between 600 rpm and 3000 rpm; preferably, the speed of the motor 32 is between 700 rpm and 1000 rpm. By further designing the speed of the motor 32, the wind noise and energy consumption can be reduced while meeting the cooling requirements.

[0051] Combination Fig.12 The fan cover 4 is preferably located outside the first chassis 1, and the fan cover 4 is installed at the first air outlet 11; wherein the fan cover 4 has a plurality of guide strips 42, and the guide strips 42 have guide surfaces 421, so that the fan cover 4 can better discharge the wind blown out by the fan unit 3 into the warehouse evenly, ensuring that the temperature difference between various areas in the warehouse is reduced. Preferably, the fan cover 4 is made of low-temperature resistant materials, such as polyethylene, polypropylene, polytetrafluoroethylene, polyamide or polyetheretherketone materials, so that the fan cover 4 is light in weight and can be better applied to the low temperature and ultra-low temperature environment in the warehouse, while ensuring the service life and working reliability of the fan cover 4, it is also conducive to further reducing the weight of the cold storage internal machine 100.

[0052] Combination Fig.13The first chassis 1 is preferably provided with a slot group 111 at the first air outlet 11, and correspondingly, the fan cover 4 is provided with a buckle group 41, so that when the fan cover 4 is assembled with the first chassis 1, the fan cover 4 can first pass through the slot group 111 and be engaged with the slot group 111, and then the fan cover 4 and the first chassis 1 are further fixed by fasteners, so that the assembly between the fan cover 4 and the first chassis 1 is more convenient and easy to operate.

[0053] Preferably, the number of the first air outlets 11 is between 1 and 8; the number of the fan units 3 is between 1 and 8, and the plurality of fan units correspond to the plurality of first air outlets 11 one by one, so that one fan unit 3 is matched with one air outlet; the number of the fan covers 4 is between 1 and 8, and the plurality of fan covers 4 correspond to the plurality of first air outlets 11 one by one, so that one fan cover 4 is matched with one first air outlet 11. It can be seen that the number of the first air outlets 11 can be adjusted and designed accordingly with the size of the warehouse, so as to meet the refrigeration demand in the warehouse and reduce the space occupied by the cold storage machines 100 when using fewer cold storage machines 100; at the same time, further in conjunction with the spacing w between the first fins 21 of the first heat exchanger 2, the volume of the cold storage machine 100 can be further reduced, so as to realize the refrigeration of the large space warehouse by the small cold storage machine 100, and the utilization rate of the warehouse can be further improved.

[0054] Cold storage air conditioning example

[0055] The cold storage air conditioner includes a cold storage outdoor unit and a cold storage indoor unit; wherein the cold storage indoor unit is the cold storage indoor unit described in the above cold storage indoor unit embodiment; the cold storage outdoor unit includes a second chassis, a second heat exchanger, a compressor, an expansion valve, a four-way valve and an outdoor fan.

[0056] The second chassis has a second air outlet and a second air return port, and the second heat exchanger is arranged in the second chassis, and the second heat exchanger is located between the second air outlet and the second air return port. The compressor is arranged in the second chassis, and the expansion valve and the four-way valve are preferably also arranged in the second chassis. The air outlet of the compressor is connected to the input port of the four-way valve, and the air return port of the compressor is connected to the output port of the four-way valve. The second heat exchanger has a second heat exchange tube, and the first connector of the second heat exchange tube is connected to the first interface of the expansion valve, and the second connector of the second heat exchange tube is connected to the first transfer port of the four-way valve. The outdoor fan is arranged in the second chassis, and the outdoor fan is located between the second heat exchanger and the second air outlet to discharge the air in the second chassis out of the second chassis through the second air outlet.

[0057] The first connector of the first heat exchange pipe of the cold storage unit is connected to the second transfer port of the four-way valve, and the second connector of the first heat exchange pipe is connected to the second interface of the expansion valve. When the air outlet is connected to the first transfer port, the return air port is connected to the second transfer port; when the air outlet is connected to the second transfer port, the return air port is connected to the first transfer port.

[0058] It can be seen that the cold storage air conditioner makes it more convenient to repair the cold storage internal unit by setting the above-mentioned cold storage internal unit, and the production cost and maintenance cost are lower; at the same time, since the vibration generated by the cold storage internal unit when working is smaller than that of the existing cold storage internal unit, the noise in the warehouse is also relatively small.

[0059] Cold storage system implementation

[0060] The cold storage system includes a storeroom and the cold storage air conditioner in the cold storage air conditioner embodiment. The cold storage internal unit is installed in the storeroom, and the cold storage external unit is installed outside the storeroom. The cold storage system is provided with the cold storage air conditioner, so that it is more convenient to repair the cold storage internal unit, and the production cost and maintenance cost are lower; at the same time, since the vibration generated by the cold storage internal unit during operation is smaller than that of the existing cold storage internal unit, the noise in the storeroom is also relatively small.

[0061] Finally, it should be emphasized that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various changes and modifications. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. Cold storage internal machines, including: A first chassis, wherein the first chassis is provided with a first air outlet and a first air return outlet; A first heat exchanger, the first heat exchanger is disposed in the first chassis and between the first air outlet and the first air return outlet; Characterized in that the cold storage internal machine also includes: A fan unit, the fan unit comprising a mounting frame, a motor and a fan blade, the mounting frame being mounted in the first chassis, the mounting frame being located between the first heat exchanger and the first air outlet, the motor being mounted on the mounting frame, the fan blade being mounted on a motor shaft of the motor, and the motor driving the fan blade to deliver air to the first air outlet; A fan cover is installed at the first air outlet.

2. The cold storage internal machine according to claim 1, characterized in that: The first heat exchanger includes a plurality of first fins and a first heat exchange tube. The plurality of first fins are arranged side by side along the length direction of the first chassis. The first heat exchange tube passes through the first fins and is in a winding shape.

3. The cold storage internal machine according to claim 2, characterized in that: The distance between two adjacent first fins is less than or equal to 2 mm; The rotation speed of the motor is between 600 rpm and 3000 rpm.

4. The cold storage internal machine according to claim 3, characterized in that: The rotation speed of the motor is between 700 rpm and 1000 rpm.

5. The cold storage internal machine according to claim 1, characterized in that: The first chassis is provided with a card slot group at the first air outlet; The fan cover is located outside the first chassis, and a buckle group is provided on the fan cover. The buckle group passes through the slot group and is engaged with the slot group.

6. The cold storage internal machine according to claim 1, characterized in that: The fan cover has a plurality of guide strips, and the guide strips have guide surfaces; The fan cover is made of polyethylene, polypropylene, polytetrafluoroethylene, polyamide or polyetheretherketone; The mounting frame comprises a main body, a first connecting part, a second connecting part and an overlapping part, the motor is mounted on the main body, the first connecting part and the overlapping part are located at the top of the main body, the first connecting part is connected to the first chassis, the second connecting part is located at the bottom of the main body, the second connecting part is connected to the first chassis, the overlapping part comprises a connecting section, a first elastic segment and a second elastic segment, the connecting section is connected between the first elastic segment and the second elastic segment, a clamping position is formed between the connecting section, the first elastic segment and the second elastic segment, and the first heat exchanger is clamped in the clamping position.

7. The cold storage internal machine according to claim 1, characterized in that: The fan blades are made of polyethylene, polypropylene, polytetrafluoroethylene, polyamide or polyetheretherketone.

8. The cold storage internal machine according to any one of claims 1 to 7, characterized in that: The number of the first air outlets is between 1 and 8; The number of the fan units is between 1 and 8, and one fan unit is matched with one first air outlet; The number of the fan covers is between 1 and 8, and one fan cover is matched with one first air outlet; A first shock absorbing element is arranged between the mounting frame and the first chassis, and a second shock absorbing element is arranged between the mounting frame and the motor.

9. A cold storage air conditioner, including a cold storage outdoor unit, wherein the cold storage outdoor unit includes: A second chassis, the second chassis having a second air outlet and a second air return outlet; A second heat exchanger, the second heat exchanger is disposed in the second chassis and located between the second air outlet and the second air return outlet; A compressor, an expansion valve and a four-way valve, wherein the compressor, the expansion valve and the four-way valve are all arranged in the second chassis, the air outlet of the compressor is connected to the input port of the four-way valve, the air return port of the compressor is connected to the output port of the four-way valve, the first connector of the second heat exchanger is connected to the first interface of the expansion valve, and the second connector of the second heat exchanger is connected to the first transfer port of the four-way valve; an outdoor fan, the outdoor fan being arranged in the second housing and between the second heat exchanger and the second air outlet; Features: The cold storage air conditioner also includes a cold storage internal unit according to any one of claims 1 to 8, wherein the first connector of the first heat exchanger is connected to the second transfer port of the four-way valve, and the second connector of the first heat exchanger is connected to the second interface of the expansion valve; When the air outlet is connected to the first transfer port, the air return port is connected to the second transfer port; When the air outlet is connected to the second transfer port, the air return port is connected to the first transfer port.

10. A cold storage system, including a storeroom, characterized in that: The cold storage system further comprises a cold storage air conditioner as claimed in claim 9, wherein the cold storage internal unit is installed in the storeroom, and the cold storage external unit is arranged outside the storeroom.

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