Refrigeration and defrosting system of refrigeration house and refrigeration house

Abstract

The utility model provides a refrigeration and defrosting system of a refrigeration house and the refrigeration house, the refrigeration and defrosting system of the refrigeration house comprises a compressor, an outdoor heat exchanger, an electronic expansion valve, an indoor heat exchanger and an electronic four-way valve, the indoor heat exchanger comprises a plurality of fins and a pipe unit, and an air outlet of the compressor is connected with a first input port of the electronic four-way valve; an air return port of the compressor is connected with a first output port of the electronic four-way valve, a heat exchange pipe of the outdoor heat exchanger is connected with a first transfer port of the electronic four-way valve and a second input port of the electronic expansion valve, and the pipe unit is connected with a second output port of the electronic expansion valve and a second transfer port of the electronic four-way valve. When the first input port is communicated with the first transfer port, the first output port is communicated with the second transfer port; when the first input port is communicated with the second transfer port, the first output port is communicated with the first transfer port. The refrigeration house is provided with the refrigeration house refrigerating and defrosting system, and the refrigeration house refrigerating and defrosting system has the advantages of being high in defrosting speed, good in defrosting effect and small in influence on the house temperature.

Description

Technical Field

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

[0002] Cold storage is mainly used to store items with specific temperature and humidity requirements. Compared with traditional refrigerators, cold storage has a larger cooling capacity and larger storage space. It is widely used in food, chemical, medical, scientific experiments and other fields. The refrigeration system of existing cold storage mainly has the following two types:

[0003] The first one, such as Figure 1 As shown, the refrigeration system 91 includes a compressor 911, a condenser 912, an expansion valve 913 and a cold discharge pipe 914; wherein, the air outlet of the compressor 911 is connected to the first end of the first heat exchange pipe of the condenser 912, the second end of the first heat exchange pipe is connected to the first interface of the expansion valve 913, the second interface of the expansion valve 913 is connected to the first end of the cold discharge pipe 914, and the second end of the cold discharge pipe 914 is connected to the return air port of the compressor 911. The cold discharge pipe 914 is arranged in the warehouse 92 of the cold storage, so that the cold discharge pipe 914 and the air in the warehouse 92 can exchange heat to achieve refrigeration of the warehouse 92; however, the disadvantage of this type of cold storage is that when the cold discharge pipe 914 is defrosted, the refrigeration system 91 of the cold storage needs to stop running to wait for the frost on the cold discharge pipe 914 to melt naturally, so the defrosting time is long and the defrosting efficiency is low.

[0004] The second type, such as Figure 2 As shown, the refrigeration system 93 includes a compressor 931, a condenser 932, an expansion valve 933, an evaporator 934, a condensing fan 935, an evaporating fan 936 and a heating module 937. The air outlet of the compressor 931 is connected to the first end of the first heat exchange tube of the condenser 932, the second end of the first heat exchange tube is connected to the first interface of the expansion valve 933, the second interface of the expansion valve 933 is connected to the first end of the second heat exchange tube of the evaporator 934, the second end of the second heat exchange tube is connected to the return air port of the compressor 931, the condensing fan 935 is arranged at the condenser 932, the evaporating fan 936 is arranged at the evaporator 934, and the heating module 937 is installed on the evaporator 934. The evaporator 934 and the evaporating fan 936 are arranged in the warehouse 94. The evaporating fan 936 accelerates the air flow at the evaporator 934 so that the air in the warehouse 94 can exchange heat with the evaporator 934 and form cold air. When the evaporator 934 needs to be defrosted, the refrigeration system 93 is controlled to suspend refrigeration and the heating module 937 is turned on to melt the frost on the evaporator 934. Compared with the first type of cold storage mentioned above, this type of cold storage has a faster defrosting speed.

[0005] However, both the refrigeration system 91 of the first cold storage and the refrigeration system 93 of the second cold storage are single-cooling refrigeration systems; therefore, there are still problems such as long defrosting time and large fluctuations in the temperature of the warehouse during defrosting. In addition, in order to reduce the number of defrosting times and ensure the heating effect of the heating module 937, the fin spacing of the evaporator 934 of the second refrigeration system 93 is usually designed to be more than 4 mm, which makes the volume of the evaporator 934 larger, and then makes the volume of the machine in the cold storage larger, occupies the warehouse space, and reduces the utilization rate of the warehouse space. Summary of the invention

[0006] In order to solve the above problems, the main purpose of the utility model is to provide a cold storage refrigeration and defrosting system with fast defrosting speed, good defrosting effect and little impact on the ambient temperature in the storeroom.

[0007] Another object of the utility model is to provide a cold storage equipped with the cold storage refrigeration and defrosting system.

[0008] In order to achieve the main purpose of the utility model, the utility model provides a cold storage refrigeration and defrosting system, including a compressor, an outdoor heat exchanger, an electronic expansion valve, an indoor heat exchanger, an outdoor fan, an indoor fan and a controller, the outdoor fan is arranged at the outdoor heat exchanger, the indoor fan is arranged at the indoor heat exchanger, and the controller is electrically connected to the compressor, the electronic expansion valve, the outdoor fan and the indoor fan respectively, wherein the cold storage refrigeration and defrosting system also includes an electronic four-way valve, the electronic four-way valve is electrically connected to the controller, the indoor heat exchanger includes a plurality of fins and a tube unit, the plurality of fins are distributed along the thickness direction thereof, the spacing between two adjacent fins is less than or equal to 2 mm, the tube unit includes a multi-group manifold, an input pipe and an output pipe, the multi-group manifold is distributed along the length direction of the fin, the manifold is serpentine and passes through the fin, the input pipe has a first inlet and a plurality of manifold outlets, and the plurality of manifold outlets are connected to the multi-group manifold One-to-one correspondence, a diversion outlet is connected to the second inlet of a corresponding group of diversion pipes, the output pipe has a first outlet and multiple diversion inlets, the multiple diversion inlets correspond one-to-one to the multiple groups of diversion pipes, and one diversion outlet is connected to the second outlet of the corresponding group of diversion pipes; the air outlet of the compressor is connected to the first input port of the electronic four-way valve, the return air port of the compressor is connected to the first output port of the electronic four-way valve, the first transfer port of the electronic four-way valve is connected to the first end of the heat exchange pipe of the outdoor heat exchanger, the second end of the heat exchange pipe is connected to the second input port of the electronic expansion valve, the first inlet is connected to the second output port of the electronic expansion valve, and the first outlet is connected to the second transfer port of the electronic four-way valve; when the controller controls the first input port to be connected to the first transfer port, the first output port is connected to the second transfer port; when the controller controls the first input port to be connected to the second transfer port, the first output port is connected to the first transfer port.

[0009] It can be seen from the above that by setting an electronic four-way valve, the cold storage refrigeration and defrosting system can realize thermal fluorine defrosting. Compared with the existing cold storage refrigeration system that adopts natural defrosting or electric heating defrosting, the cold storage refrigeration and defrosting system has a faster defrosting speed, cleaner frost removal and less impact on the temperature in the warehouse, thereby reducing the ambient temperature fluctuation in the warehouse during the defrosting process and being more energy-efficient; in addition, through the design of the fin spacing, while achieving the same required heat exchange area, the volume of the indoor heat exchanger can be reduced by more than half compared with the volume of the conventional cold storage indoor heat exchanger, so as to improve the utilization rate of the warehouse; and, the cold storage refrigeration and defrosting system can also realize heating, which is more practical and can better meet the needs of users; furthermore, through the design of the pipe unit, the uniformity of the refrigerant heat exchange can be improved, thereby making the evaporation temperature of the indoor heat exchanger more uniform.

[0010] A further solution is that the indoor heat exchanger also includes an electronic pressure regulating valve and a capillary tube, and the electronic pressure regulating valve and the controller are electrically connected; the input pipe includes an input section, a relay section, a main section and multiple branch sections, the first end of the input section is a first inlet, the second end of the input section is connected to the third inlet of the electronic pressure regulating valve, the first end of the relay section is connected to the third outlet of the electronic pressure regulating valve, the second end of the relay section is connected to the main section, the first end of the branch section is connected to the main section, the second end of the branch section is a diversion outlet, the first end of the capillary tube is connected to the input section, and the second end of the capillary tube is connected to the relay section.

[0011] As can be seen from the above, this design enables the cold storage refrigeration and defrosting system to cooperate with the refrigerant to achieve low-temperature and ultra-low-temperature refrigeration, thereby improving the refrigeration range and refrigeration capacity of the cold storage refrigeration and defrosting system.

[0012] A further solution is that a groove is provided in the straight section of the shunt pipe, and the groove extends along the axial direction of the straight section or extends in a spiral shape.

[0013] It can be seen from the above that this design can further improve the heat exchange effect of the indoor heat exchanger, and is conducive to reducing the circulation volume and cooling time of the refrigerant, thereby further reducing energy consumption; furthermore, this design can also enhance the seismic resistance of the indoor heat exchanger, thereby better reducing noise.

[0014] A preferred solution is that the depth of the groove is between 0.1 mm and 0.3 mm; when the groove extends in a spiral shape, the helix angle of the groove is between 8° and 30°.

[0015] Another preferred solution is that the diameter of the shunt tube is between 6 mm and 9 mm; the wall thickness of the shunt tube is between 0.3 mm and 1 mm.

[0016] It can be seen from the above that the above design can ensure both the performance and the strength of the shunt pipe.

[0017] A further solution is that the fins are made of copper, aluminum or stainless steel; the shunt pipe is made of copper, aluminum or stainless steel; the input pipe is made of copper, aluminum or stainless steel; and the output pipe is made of copper, aluminum or stainless steel.

[0018] It can be seen from the above that this design can ensure the heat exchange effect of the indoor heat exchanger.

[0019] A further solution is that the number of indoor fans is between 1 and 8, and the specifications of the indoor heat exchanger match the number of indoor fans.

[0020] It can be seen from the above that the above design makes the cold storage refrigeration and defrosting system applicable to warehouses of different sizes, and better improves the utilization rate of the warehouse space while ensuring that the refrigeration needs in the warehouse are met.

[0021] A further solution is that the blades of the indoor fan are made of polyethylene, polypropylene, polytetrafluoroethylene, polyamide or polyetheretherketone.

[0022] As can be seen from the above, through the material design of the fan blades, the fan blades have the advantages of light weight and low temperature resistance, which is beneficial to extending the service life of the fan blades.

[0023] A further solution is that the speed of the indoor fan is between 600 rpm and 3000 rpm.

[0024] It can be seen from the above that by designing the speed of the indoor fan, the wind noise and energy consumption can be reduced while meeting the cooling needs.

[0025] In order to achieve another purpose of the utility model, the utility model provides a cold storage, including a warehouse, which also includes the above-mentioned cold storage refrigeration and defrosting system, the indoor heat exchanger and the indoor fan are arranged in the warehouse, and the compressor, outdoor heat exchanger, electronic expansion valve, outdoor fan and controller are arranged outside the warehouse.

[0026] It can be seen from the above that the cold storage equipped with the above-mentioned cold storage refrigeration and defrosting system can realize thermal fluorine defrosting, and compared with the cold storage using natural defrosting or electric heating defrosting, the defrosting speed of this cold storage is faster, the frost blocks are removed more cleanly and the impact on the temperature in the warehouse is small, thereby reducing the ambient temperature fluctuation in the warehouse during the defrosting process and being more energy-efficient; in addition, through the design of the fin spacing, while achieving the same required heat exchange area, the volume of the indoor heat exchanger can be reduced by more than half compared with the volume of the indoor heat exchanger of a conventional cold storage, so as to improve the utilization rate of the warehouse; and, the cold storage can also achieve heating, which is more practical and can better meet the needs of users; furthermore, through the design of the pipe unit, the uniformity of the refrigerant heat exchange can be improved, thereby making the evaporation temperature of the indoor heat exchanger more uniform. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is the system block diagram of the first existing cold storage refrigeration system.

[0028] Figure 2 It is the system block diagram of the second existing cold storage refrigeration system.

[0029] Figure 3 It is a system block diagram of a cold storage refrigeration and defrosting system of the utility model.

[0030] Figure 4 The utility model is a structural schematic diagram of an indoor heat exchanger of a cold storage refrigeration and defrosting system.

[0031] Figure 5 It is a partial structural diagram of an indoor heat exchanger of a cold storage refrigeration and defrosting system of the utility model.

[0032] Figure 6 The utility model is a partial structural schematic diagram of an indoor heat exchanger of a cold storage refrigeration and defrosting system with some components omitted.

[0033] Figure 7 It is an axial cross-sectional view of a straight section of a shunt pipe of a cold storage refrigeration and defrosting system of the utility model.

[0034] Figure 8 It is an expanded view of the local structure of the straight section of the shunt pipe of the cold storage refrigeration and defrosting system of the utility model.

[0035] Fig. 9 It is a structural diagram of an output pipe of a cold storage refrigeration and defrosting system of the utility model.

[0036] Fig.10 It is a structural diagram of an input pipe of a cold storage refrigeration and defrosting system of the utility model.

[0037] The present invention will be further described below with reference to the accompanying drawings and embodiments. DETAILED DESCRIPTION

[0038] Cold storage refrigeration and defrosting system embodiment

[0039] Combination Figure 3The cold storage refrigeration and defrosting system 100 includes a compressor 1, an outdoor heat exchanger 2, an electronic expansion valve 3, an electronic four-way valve 4, an indoor heat exchanger 5, an outdoor fan 6, an indoor fan 7 and a controller 8. Among them, the compressor 1, the outdoor heat exchanger 2, the electronic expansion valve 3, the electronic four-way valve 4, the outdoor fan 6 and the controller 8 are all arranged outside the warehouse of the cold storage; the indoor heat exchanger 5 and the indoor fan 7 are arranged in the warehouse to realize refrigeration of the warehouse; the outdoor fan 6 is arranged at the outdoor heat exchanger 2 to accelerate the air flow speed at the outdoor heat exchanger 2; the indoor fan 7 is arranged at the indoor heat exchanger 5 to accelerate the air flow at the indoor heat exchanger 5 and in the warehouse, so that the air in the warehouse and the indoor heat exchanger 5 circulate for heat exchange, thereby reducing the temperature in the warehouse; the controller 8 is electrically connected to the compressor 1, the electronic expansion valve 3, the electronic four-way valve 4, the outdoor fan 6 and the indoor fan 7 respectively, and the controller 8 can switch the working mode of the cold storage refrigeration and defrosting system 100 through the electronic four-way valve 4, such as switching the cold storage refrigeration and defrosting system 100 from the refrigeration mode to the defrosting mode (or heating mode) to realize the defrosting and removing of the frost blocks on the indoor heat exchanger 5.

[0040] Combination Figure 4 and Figure 5 The indoor heat exchanger 5 includes a plurality of fins 51 and a tube unit 52. The plurality of fins 51 are distributed along the thickness direction thereof, and preferably, the plurality of fins 51 are distributed along the length direction of the indoor heat exchanger 5, wherein the spacing W between two adjacent fins 51 is less than or equal to 2 mm; as in this embodiment, the spacing W between two adjacent fins 51 is equal to 2 mm. By designing the spacing of the fins 51, the volume of the indoor heat exchanger 5 can be reduced by more than one time compared with the volume of the conventional indoor heat exchanger 5 while achieving the same required heat exchange area, thereby facilitating the improvement of the utilization rate of the warehouse.

[0041] The pipe unit 52 preferably includes a multi-component flow pipe 521, an input pipe 522 and an output pipe 523. Figure 6 As shown, the multi-group shunt tubes 521 are distributed along the length direction of the fins 51, and the shunt tubes 521 extend in a winding shape and penetrate each fin 51, which is beneficial to improving the heat exchange effect of the indoor heat exchanger 5. Through the design of the shunt tubes 521, the uniformity of the heat exchange of the refrigerant can be effectively improved, thereby making the evaporation temperature of the indoor heat exchanger 5 more uniform.

[0042] like Figure 7 and Figure 8As shown, a groove 5213 is preferably provided in the straight section of the shunt pipe 521; wherein the groove 5213 extends along the axial direction of the straight section, or the groove 5213 extends in a spiral shape; as in the present embodiment, the groove 5213 extends in a spiral shape, preferably, when the groove 5213 extends in a spiral shape, the spiral angle a of the groove 5213 is preferably between 8° and 30°. By providing the groove 5213 in the straight section of the shunt pipe 521, the heat exchange effect of the indoor heat exchanger 5 can be further improved, and it is also helpful to reduce the circulation amount and cooling time of the refrigerant, thereby further reducing energy consumption; and the design of the groove 5213 can also enhance the anti-seismic ability of the indoor heat exchanger 5, thereby better reducing noise.

[0043] In addition, the depth H of the groove 5213 is preferably between 0.1 mm and 0.3 mm; the diameter D of the shunt tube 521 is preferably between 6 mm and 9 mm; the wall thickness h of the shunt tube 521 is preferably between 0.3 mm and 1 mm; this design can ensure the performance and strength of the shunt tube 521.

[0044] The input pipe 522 has a first inlet 52211 and a plurality of branch outlets 52241; wherein the plurality of branch outlets 52241 correspond one-to-one to the plurality of groups of manifolds 521, so that one branch outlet 52241 is connected to the second inlet 5211 of the corresponding group of manifolds 521. Fig. 9 The output pipe 523 has a first outlet 5231 and a plurality of branch inlets 5232 ; wherein the plurality of branch inlets 5232 correspond one-to-one to the plurality of groups of manifolds 521 , so that one branch inlet 5232 is connected to the second outlet 5212 of the corresponding group of manifolds 521 .

[0045] Preferably, the tube unit 52 further includes an electronic pressure regulating valve 53 and a capillary tube 54. The electronic pressure regulating valve 53 is electrically connected to the controller 8, so that the controller 8 can control the opening of the electronic pressure regulating valve 53. Fig.10 The input pipe 522 preferably includes an input section 5221, a relay section 5222, a main section 5223 and a plurality of branch sections 5224. The first end of the input section 5221 is the first inlet 52211 mentioned above, and the second end of the input section 5221 is connected to the third inlet of the electronic pressure regulating valve 53; the first end of the relay section 5222 is connected to the third outlet of the electronic pressure regulating valve 53, and the second end of the relay section 5222 is connected to the main section 5223; the first end of the branch section 5224 is connected to the main section 5223, and the second end of the branch section 5224 is the diversion outlet 52241 mentioned above; the first end of the capillary tube 54 is connected to the input section 5221, and the second end of the capillary tube 54 is connected to the relay section 5222. This design enables the cold storage refrigeration and defrosting system 100 to cooperate with the refrigerant to achieve low temperature and ultra-low temperature refrigeration, thereby improving the refrigeration range and refrigeration capacity of the cold storage refrigeration and defrosting system 100 provided with the present invention.

[0046] For example, when the indoor heat exchanger 5 works in a relatively low temperature or low temperature working environment, the controller 8 can control the opening of the electronic pressure regulating valve 53 to make the pressure of the refrigerant in the input section 5221 and the relay section 5222 consistent or close. At this time, the refrigerant does not flow through the capillary tube 54; when the indoor heat exchanger 5 works in an ultra-low temperature working environment, the controller 8 can control the opening of the electronic pressure regulating valve 53 to make the refrigerant pressure in the input section 5221 greater than the refrigerant pressure in the relay section 5222, thereby causing a part of the refrigerant in the input section 5221 to flow to the relay section 5222 through the electronic pressure regulating valve 53, and the other part The refrigerant flows to the relay section 5222 through the capillary tube 54, and the refrigerant flowing through the capillary tube 54 will be further throttled by the capillary tube 54 to further reduce the pressure and temperature of the refrigerant, so that when the refrigerant flowing through the capillary tube 54 and the refrigerant flowing through the electronic pressure regulating valve 53 are combined in the relay section 5222, the pressure and temperature of the combined refrigerant are lower, so that the indoor heat exchanger 5 has a lower evaporation temperature; at the same time, since the refrigerant in the input section 5221 enters the relay section 5222 through the electronic pressure regulating valve 53 and the capillary tube 54 respectively, it can ensure that the flow of the refrigerant can meet the evaporation temperature requirement of the indoor heat exchanger 5. After the refrigerant flows into the relay section 5222, the merged refrigerant will flow to each branch section 5224 through the main section 5223, and then flow to each branch pipe 521 through each branch section 5224, and then flow to the output pipe 523 through the branch pipe 521 and the branch inlet 5232, and finally be discharged from the indoor heat exchanger 5 through the first outlet 5231 of the output pipe 523.

[0047] In order to ensure the heat exchange effect of the indoor heat exchanger 5, the fins 51 are preferably made of copper, aluminum or stainless steel; the diverter pipe 521 is preferably made of copper, aluminum or stainless steel; the input pipe 522 is preferably made of copper, aluminum or stainless steel; the output pipe 523 is preferably made of copper, aluminum or stainless steel.

[0048] like Figure 3 As shown, the air outlet 11 of the compressor 1 is connected to the first input port of the electronic four-way valve 4, the air return port 12 of the compressor 1 is connected to the first output port of the electronic four-way valve 4, the first transfer port of the electronic four-way valve 4 is connected to the first end of the heat exchange tube 21 of the outdoor heat exchanger 2, the second end of the heat exchange tube 21 is connected to the second input port of the electronic expansion valve 3, the first inlet 52211 of the indoor evaporator is connected to the second output port of the electronic expansion valve 3, and the first outlet 5231 of the indoor evaporator is connected to the second transfer port of the electronic four-way valve 4.

[0049] When the controller 8 controls the first input port of the electronic four-way valve 4 to be connected to the first transfer port, the first output port is connected to the second transfer port; at this time, the cold storage refrigeration and defrosting system 100 enters the refrigeration mode; when it is necessary to defrost and remove the frost blocks on the indoor heat exchanger 5, the controller 8 temporarily controls the first input port of the electronic four-way valve 4 to be connected to the second transfer port, and the first output port is connected to the first transfer port; at this time, the cold storage refrigeration and defrosting system 100 enters the defrosting mode; when it is necessary to heat the warehouse, the controller 8 can be controlled to control the first input port of the electronic four-way valve 4 to be connected to the second transfer port for a long time, and the first output port is connected to the first transfer port; at this time, the cold storage refrigeration and defrosting system 100 enters the heating mode.

[0050] It can be seen that by setting the electronic four-way valve 4, the cold storage refrigeration and defrosting system 100 can realize thermal fluorine defrosting. Compared with the existing cold storage refrigeration system using natural defrosting or electric heating defrosting, the cold storage refrigeration and defrosting system 100 has a faster defrosting speed, cleaner frost removal and less impact on the temperature in the warehouse, thereby reducing the ambient temperature fluctuation in the warehouse during the defrosting process and being more energy-efficient. In addition, the cold storage refrigeration and defrosting system 100 can also realize heating, which is more practical and can better meet the needs of users.

[0051] Furthermore, the number of indoor fans 7 is preferably between 1 and 8; and the specifications of the indoor heat exchanger 5 match the number of indoor fans 7, that is, one indoor heat exchanger 5 can be used in conjunction with more than two indoor fans 7, such as in the present embodiment, the number of indoor heat exchangers 5 is 1, and the number of indoor fans 7 is 2. This design enables the cold storage refrigeration and defrosting system 100 to be applicable to warehouses of different sizes, and to better improve the utilization rate of the warehouse space while ensuring that the refrigeration demand in the warehouse is met. Among them, the fan blades of the indoor fan 7 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 are light and can be better applied to the low temperature and ultra-low temperature environment in the warehouse to ensure the service life of the fan blades and the reliability of the work. In addition, the rotation speed of the indoor fan 7 is preferably between 600 rpm and 3000 rpm; preferably, the rotation speed of the indoor fan 7 is between 700 rpm and 1000 rpm; by designing the rotation speed of the indoor fan 7, wind noise and energy consumption can be reduced while meeting the cooling requirements.

[0052] Cold Storage Example

[0053] The cold storage includes a storeroom and the cold storage refrigeration and defrosting system in the above-mentioned cold storage refrigeration and defrosting system embodiment; wherein, the indoor heat exchanger and the indoor fan are arranged in the storeroom, and the compressor, the outdoor heat exchanger, the electronic expansion valve, the outdoor fan and the controller are arranged outside the storeroom.

[0054] It can be seen that the cold storage equipped with the above-mentioned cold storage refrigeration and defrosting system can realize thermal fluorine defrosting, and compared with the cold storage using natural defrosting or electric heating defrosting, the defrosting speed of this cold storage is faster, the frost blocks are removed more cleanly and the impact on the temperature in the warehouse is small, thereby reducing the ambient temperature fluctuation in the warehouse during the defrosting process and being more energy-efficient; in addition, through the design of the fin spacing, while achieving the same required heat exchange area, the volume of the indoor heat exchanger can be reduced by more than half compared with the volume of the indoor heat exchanger of a conventional cold storage, so as to improve the utilization rate of the warehouse; and, the cold storage can also achieve heating, which is more practical and can better meet the needs of users; furthermore, through the design of the pipe unit, the uniformity of the refrigerant heat exchange can be improved, thereby making the evaporation temperature of the indoor heat exchanger more uniform.

[0055] 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. A cold storage refrigeration and defrosting system, comprising a compressor, an outdoor heat exchanger, an electronic expansion valve, an indoor heat exchanger, an outdoor fan, an indoor fan and a controller, wherein the outdoor fan is arranged at the outdoor heat exchanger, the indoor fan is arranged at the indoor heat exchanger, and the controller is electrically connected to the compressor, the electronic expansion valve, the outdoor fan and the indoor fan, respectively, and is characterized in that: The cold storage refrigeration and defrosting system also includes an electronic four-way valve, which is electrically connected to the controller; The indoor heat exchanger includes a plurality of fins and a tube unit, the plurality of fins are distributed in the thickness direction, and the spacing between two adjacent fins is less than or equal to 2 mm, the tube unit includes a plurality of groups of manifolds, an input tube and an output tube, the plurality of groups of manifolds are distributed along the length direction of the fins, the manifolds are in a winding shape and penetrate the fins, the input tube has a first inlet and a plurality of manifold outlets, the plurality of manifold outlets correspond to the plurality of groups of manifolds one by one, and one manifold outlet is connected to the second inlet of a corresponding group of manifolds, the output tube has a first outlet and a plurality of manifold inlets, the plurality of manifold inlets correspond to the plurality of groups of manifolds one by one, and one manifold outlet is connected to the second outlet of a corresponding group of manifolds; The air outlet of the compressor is connected to the first input port of the electronic four-way valve, the air return port of the compressor is connected to the first output port of the electronic four-way valve, the first transfer port of the electronic four-way valve is connected to the first end of the heat exchange tube of the outdoor heat exchanger, the second end of the heat exchange tube is connected to the second input port of the electronic expansion valve, the first inlet is connected to the second output port of the electronic expansion valve, and the first outlet is connected to the second transfer port of the electronic four-way valve; When the controller controls the first input port to be connected to the first transfer port, the first output port is connected to the second transfer port; When the controller controls the first input port to be connected to the second transfer port, the first output port is connected to the first transfer port.

2. The cold storage refrigeration and defrosting system according to claim 1, characterized in that: The indoor heat exchanger further comprises an electronic pressure regulating valve and a capillary tube, wherein the electronic pressure regulating valve is electrically connected to the controller; The input pipe includes an input section, a relay section, a main section and multiple branch sections. The first end of the input section is the first inlet, the second end of the input section is connected to the third inlet of the electronic pressure regulating valve, the first end of the relay section is connected to the third outlet of the electronic pressure regulating valve, the second end of the relay section is connected to the main section, the first end of the branch section is connected to the main section, the second end of the branch section is the diversion outlet, the first end of the capillary is connected to the input section, and the second end of the capillary is connected to the relay section.

3. The cold storage refrigeration and defrosting system according to claim 2 is characterized in that: A groove is provided in the straight section of the shunt pipe, and the groove extends along the axial direction of the straight section or extends in a spiral shape.

4. The cold storage refrigeration and defrosting system according to claim 3, characterized in that: The depth of the groove is between 0.1 mm and 0.3 mm; When the groove extends in a spiral shape, the helix angle of the groove is between 8° and 30°.

5. The cold storage refrigeration and defrosting system according to claim 3, characterized in that: The diameter of the shunt tube is between 6 mm and 9 mm; The maximum wall thickness of the shunt tube is between 0.3 mm and 1 mm.

6. The cold storage refrigeration and defrosting system according to any one of claims 1 to 5, characterized in that: The fins are made of copper, aluminum or stainless steel; The shunt pipe is made of copper, aluminum or stainless steel; The input pipe is made of copper, aluminum or stainless steel; The output pipe is made of copper, aluminum or stainless steel.

7. The cold storage refrigeration and defrosting system according to any one of claims 1 to 5, characterized in that: The number of the indoor fans is between 1 and 8, and the specifications of the indoor heat exchanger match the number of the indoor fans.

8. The cold storage refrigeration and defrosting system according to claim 7, characterized in that: The fan blades of the indoor fan are made of polyethylene, polypropylene, polytetrafluoroethylene, polyamide or polyetheretherketone.

9. The cold storage refrigeration and defrosting system according to claim 7, characterized in that: The rotation speed of the indoor fan is between 600 rpm and 3000 rpm.

10. A cold storage, including a storeroom, characterized in that: It also includes a cold storage refrigeration and defrosting system as described in any one of claims 1 to 9, wherein the indoor heat exchanger and the indoor fan are arranged in the warehouse, and the compressor, the outdoor heat exchanger, the electronic expansion valve, the outdoor fan and the controller are arranged outside the warehouse.

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