Energy-saving defrosting system for medium and large-sized refrigeration house and method for using the same

Abstract

The application relates to the technical field of cold storage defrosting, and discloses an energy-saving defrosting system for medium and large-sized cold storage and a use method thereof, which comprises a cold storage, the inside of the cold storage is provided with a freezing chamber, the top end of the cold storage is fixedly installed with a solar panel, the outer side of the solar panel is fixedly installed with a connecting line, the front side of the cold storage is fixedly installed with a storage battery and an inverter, and the side of the cold storage is fixedly installed with a side tank. The energy-saving defrosting system for medium and large-sized cold storage and the use method thereof are provided with two defrosting modes of hot gas defrosting and hot water defrosting, staff can select hot gas defrosting or hot water defrosting according to actual conditions, the limitation is smaller, the consumed electric energy is smaller during the defrosting process, the energy-saving property is higher, through the cooperation of the waste heat recovery assembly and the defrosting assembly, the water formed by the defrosting of frost can be conveyed to the inside of the outer tank through a liquid discharge pipe, a collecting pipe and a water pump, the secondary utilization of the defrosting water is realized, and the practicability is higher.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of cold storage defrosting, in particular to an energy-saving defrosting system for medium and large-sized cold storage. BACKGROUND

[0002] The cold storage is a kind of refrigeration equipment, and the cold storage refers to an environment different from outdoor temperature or humidity created by artificial means, and is a constant temperature and humidity storage device for food, liquid, chemical, medicine, vaccine, scientific experiment and other articles. The cold storage is usually located near the transportation port or the place of origin. Compared with the refrigerator, the cold storage has a larger refrigeration area and has a common refrigeration principle.

[0003] During the use of the cold storage, the evaporator is often frosted, and the frosting of the evaporator surface leads to poor refrigeration effect of the cold storage. Therefore, the evaporator needs to be defrosted. The existing technology mostly adopts the electric heating pipe defrosting method for defrosting. Although this defrosting method has a faster defrosting speed, it has the problems of large energy consumption and easy damage. SUMMARY

[0004] (I) Technical problems solved

[0005] In view of the deficiencies of the prior art, the present application provides an energy-saving defrosting system for medium and large-sized cold storage to solve the problem that the evaporator is often frosted during the use of the cold storage, the frosting of the evaporator surface leads to poor refrigeration effect of the cold storage, and therefore the evaporator needs to be defrosted. The existing technology mostly adopts the electric heating pipe defrosting method for defrosting. Although this defrosting method has a faster defrosting speed, it has the problems of large energy consumption and easy damage.

[0006] (II) Technical solutions

[0007] To achieve the above object, the present application provides the following technical scheme: an energy-saving defrosting system for a medium-large cold storage, comprising a cold storage, a freezing chamber is arranged in the cold storage, a solar panel is fixedly installed at the top end of the cold storage, a connecting line is fixedly installed at the outer side of the solar panel, a storage battery and an inverter are fixedly installed at the front side of the cold storage, a side box is fixedly installed at the side of the cold storage, a compressor unit is fixedly installed in the side box, an outdoor unit is fixedly installed at the top end of the side box, a top box is arranged at the upper side of the outdoor unit, a main air outlet pipe is fixedly installed at the back of the top box, a tee joint is arranged at the outer side of the main air outlet pipe, a secondary air outlet pipe is interconnected at the outer side of the tee joint, a defrosting assembly and a waste heat recovery assembly are fixedly installed at the back of the side box, an indoor unit is fixedly installed in the freezing chamber, an evaporator is fixedly installed in the indoor unit, an air inlet pipe and an air outlet pipe are fixedly installed at the outer side of the evaporator, an air exhaust fan is fixedly installed at the front side of the indoor unit, a liquid discharge pipe is fixedly installed at the bottom end of the indoor unit, a four-way joint one is fixedly installed at the outer side of the air inlet pipe, a side pipe one and a side pipe two are fixedly installed at the outer side of the four-way joint one, a four-way joint two is fixedly installed at the outer side of the air outlet pipe, a side pipe three and a side pipe four are fixedly installed at the outer side of the four-way joint two, an air suction pipe is arranged between the outdoor unit and the top box, and an air suction pump is fixedly installed in the top box.

[0008] The defrosting assembly comprises an outer box, a water supply pipe, a collecting pipe and a water pump one, the outer box is fixedly installed at the back of the side box, the water supply pipe and the collecting pipe are both fixedly installed at the back of the outer box, and the outer sides of the water supply pipe and the collecting pipe are both fixedly installed with a water pump two.

[0009] The waste heat recovery assembly comprises a main air supply pipe, a secondary air supply pipe and an air supply head, the main air supply pipe is fixedly installed at the outer side of the main air outlet pipe, the outer side of the main air supply pipe is fixedly installed with the secondary air supply pipe, and the outer side of the secondary air supply pipe is fixedly installed with the air supply head.

[0010] Preferably, the solar panel, the inverter and the storage battery are electrically connected, the solar panel is distributed at equal intervals at the top end of the cold storage, and the storage battery is electrically connected with the compressor unit, the outdoor unit and the indoor unit.

[0011] Preferably, the main air supply pipe is symmetrically distributed about the center line of the main air outlet pipe, the main air supply pipe, the secondary air supply pipe and the air supply head are all located in the inner side of the outer box, the secondary air supply pipe and the air supply head are both provided with a plurality of same ones, and the plurality of secondary air supply pipes and air supply heads are distributed at equal intervals.

[0012] Preferably, the water supply pipe is interconnected with the side pipe two, the side pipe one is interconnected with the secondary air outlet pipe, the side pipe three and the liquid discharge pipe are both interconnected with the collecting pipe, the side pipe four is interconnected with the outside, the liquid discharge pipe extends to the inner side of the indoor unit, and the bottom end of the indoor unit is in a funnel structure.

[0013] Preferably, the freezing chamber is the same as the number of indoor units, and one-to-one correspondence, the number of exhaust fan is three times the number of indoor units, and exhaust fan is equidistant distribution in the outside of the indoor unit.

[0014] Preferably, the evaporator is connected with the compressor group through the air inlet pipe and the air outlet pipe, the number of evaporators is the same as the number of indoor units, and the center line of the evaporator and the indoor unit is located on the same straight line.

[0015] Preferably, the air suction pipe is provided with the same plurality, and the outdoor unit and the top box are connected with each other through the air suction pipe, the air suction pump is connected with the main air outlet pipe, and the lower end of the main air outlet pipe extends to the inside of the outdoor box.

[0016] Compared with the prior art, the present application provides an energy-saving defrosting system for a medium-large refrigeration house, which has the following beneficial effects:

[0017] 1. The energy-saving defrosting system for a medium-large refrigeration house and its use method, the solar panel at the top of the refrigeration house can convert solar energy into electrical energy and store it in the battery through the inverter, the battery can provide power for the refrigeration house, can reduce the energy consumption of the refrigeration house, and can also improve the energy saving of the refrigeration house;

[0018] 2. The energy-saving defrosting system for a medium-large refrigeration house and its use method, two defrosting modes of hot gas defrosting and hot water defrosting are provided, the staff can select hot gas defrosting or hot water defrosting according to the actual situation, the limitation is smaller, the consumed electric energy is less during the defrosting process, and the energy saving is higher;

[0019] 3. The energy-saving defrosting system for a medium-large refrigeration house and its use method, the waste heat recovery assembly and the defrosting assembly are provided, the main air outlet pipe can deliver hot gas to the inside of the main air supply pipe through the three-way joint, the main air supply pipe can deliver hot gas to the inside of the outdoor box through the auxiliary air supply pipe and the air supply head, the water in the outdoor box can be heated through the cooperation of the main air supply pipe, the auxiliary air supply pipe and the air supply head, the steam in the outdoor box can be discharged through the opening at the top, and the opening at the top of the outdoor box can also be used for adding water, the waste heat can be utilized, the energy saving of the medium-large refrigeration house can be improved, and the water melted from the frost can be delivered to the inside of the outdoor box through the liquid discharge pipe, the collecting pipe and the water pump, so that the secondary utilization of the water melted from the frost is realized, and the practicality is higher. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is a three-dimensional structure schematic diagram of the present application;

[0021] Figure 2 It is a defrosting assembly installation structure schematic diagram of the present application;

[0022] Figure 3 It is an indoor unit installation structure schematic diagram of the present application;

[0023] Figure 4 It is the back structure schematic diagram of the internal machine in the application;

[0024] Figure 5 It is the exhaust fan installation structure schematic diagram of the application;

[0025] Figure 6 It is the waste heat recovery assembly installation structure schematic diagram of the application;

[0026] Figure 7 It is the internal machine in the application Figure 6 It is the enlarged structure schematic diagram of A in the application.

[0027] 1, cold storage; 2, freezing chamber; 3, solar panel; 4, connecting wire; 5, battery; 6, inverter; 7, side box; 8, compressor unit; 9, external machine; 10, top box; 11, main air outlet pipe; 12, three-way; 13, auxiliary air outlet pipe; 14, defrosting assembly; 1401, outer box; 1402, water supply pipe; 1403, collecting pipe; 1405, water pump two; 15, waste heat recovery assembly; 1501, main air supply pipe; 1502, auxiliary air supply pipe; 1503, air supply head; 16, evaporator; 17, air inlet pipe; 18, exhaust pipe; 19, liquid discharge pipe; 20, four-way one; 21, side pipe one; 22, side pipe two; 23, exhaust fan; 24, air suction pipe; 25, air suction pump; 26, four-way two; 27, side pipe three; 28, side pipe four; 29, internal machine. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the application will be clearly and completely described below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the application.

[0029] Please refer to Figures 1-7The utility model provides a kind of energy-saving defrosting system of medium-sized cold storage, including cold store 1, the inside of cold store 1 is provided with freezer room 2, the top of cold store 1 is fixedly installed with solar panel 3, the outside of solar panel 3 is fixedly installed with connecting line 4, the front of cold store 1 is fixedly installed with battery 5 and inverter 6, the side of cold store 1 is fixedly installed with side tank 7, the inside of side tank 7 is fixedly installed with compressor unit 8, the top of side tank 7 is fixedly installed with outdoor unit 9, the upper side of outdoor unit 9 is provided with top box 10, the back of top box 10 is fixedly installed with main air outlet pipe 11, the outside of main air outlet pipe 11 is provided with tee 12, the outside of tee 12 is interconnected with auxiliary air outlet pipe 13, the back of side tank 7 is fixedly installed with defrosting assembly 14 and waste heat recovery assembly 15, the inside of freezer room 2 is fixedly installed with indoor unit 29, the inside of indoor unit 29 is fixedly installed with evaporator 16, the outside of evaporator 16 is fixedly installed with air inlet pipe 17 and exhaust pipe 18, the front of indoor unit 29 is fixedly installed with exhaust fan 23, the bottom of indoor unit 29 is fixedly installed with liquid discharge pipe 19, the outside of air inlet pipe 17 is fixedly installed with four-way one 20, the outside of four-way one 20 is fixedly installed with side pipe one 21 and side pipe two 22, the outside of exhaust pipe 18 is fixedly installed with four-way two 26, the outside of four-way two 26 is fixedly installed with side pipe three 27 and side pipe four 28, between outdoor unit 9 and top box 10 is provided with suction pipe 24, the inside of top box 10 is fixedly installed with suction pump 25, solar panel 3, inverter 6 and battery 5 are electrically connected, solar panel 3 is equidistantly distributed at the top of cold store 1, battery 5 is electrically connected with compressor unit 8, outdoor unit 9 and indoor unit 29, freezer room 2 and indoor unit 29 are same in number, and one-to-one correspondence, the number of exhaust fan 23 is three times of indoor unit 29, and exhaust fan 23 is equidistantly distributed at the outside of indoor unit 29, evaporator 16 is interconnected with compressor unit 8 by air inlet pipe 17 and exhaust pipe 18, evaporator 16 and indoor unit 29 are same in number, the center line of evaporator 16 and indoor unit 29 is on the same straight line, suction pipe 24 is provided with same multiple, and outdoor unit 9 and top box 10 are interconnected by suction pipe 24, suction pump 25 is interconnected with main air outlet pipe 11, the lower end of main air outlet pipe 11 extends to the inside of outer box 1401, in the process of using energy-saving defrosting system, compressor unit 8 transports condensing agent to the inside of evaporator 16 by air inlet pipe 17, evaporator 16 carries out heat exchange, exhaust fan 23 blows cold air into the inside of freezer room 2, realizes that the temperature of freezer room 2 inside reduces, after use, condensing agent returns to the inside of compressor unit 8 by exhaust pipe 18, after evaporator 16 works for a certain time, the rear end of frost on the surface of evaporator 16 is observed, when the thickness of frost on the surface of evaporator 16 is thin, suction pump 25 can suck the hot air in the inside of outdoor unit 9 into the inside of main air outlet pipe 11 by suction pipe 24, three-way valve 12 is operated at this time, the hot air in the inside of main air outlet pipe 11 is transported to the inside of side pipe one 21 by auxiliary air outlet pipe 13, four-way one 20 is operated at this time, makes air inlet pipe 17 and side pipe one 21 connect,The operation of four-way valve 26 makes side tube four 28 and exhaust pipe 18 intercommunicate, and the hot gas flows through the coil inside evaporator 16, which can transfer heat to evaporator 16, so as to realize defrosting of evaporator 16. The used hot gas is discharged to the outside of cold storage 1 through side tube four 28, and after waiting for a certain period of time, defrosting can be completed. At this time, the frost melts into water and is transported to the inside of outer box 1401 through drain pipe 19, collecting pipe 1403 and water pump two 1405, realizing secondary utilization of frost melting water. At the same time, solar panel 3 located at the top end of cold storage 1 can convert solar energy into electric energy and store it in battery 5 through inverter 6. Battery 5 can provide power for cold storage 1, which can reduce the energy consumption of cold storage 1 and improve the energy saving of cold storage 1.

[0030] Defrosting assembly 14 includes outer box 1401, water supply pipe 1402, collecting pipe 1403 and water pump two 1405. Outer box 1401 is fixedly installed on the back of side box 7. Water supply pipe 1402 and collecting pipe 1403 are both fixedly installed on the back of outer box 1401. Water pump two 1405 is fixedly installed on the outside of water supply pipe 1402 and collecting pipe 1403. Water supply pipe 1402 is in intercommunication with side tube two 22. Side tube one 21 is in intercommunication with auxiliary air outlet pipe 13. Side tube three 27 and drain pipe 19 are both in intercommunication with collecting pipe 1403. Side tube four 28 is in intercommunication with the outside. Drain pipe 19 extends to the inside of indoor unit 29. The bottom end of indoor unit 29 is in funnel structure. When the thickness of frost on the surface of evaporator 16 is relatively thick, water supply pipe 1402 and water pump two 1405 can transport hot water in the inside of outer box 1401 to the inside of side tube two 22. At this time, the operation of four-way valve one 20 and four-way valve two 26 makes side tube two 22 and air inlet pipe 17 intercommunicate, and makes side tube three 27 and exhaust pipe 18 intercommunicate. The hot water in the inside of side tube two 22 enters the inside of evaporator 16 through air inlet pipe 17. The hot water can heat the coil inside evaporator 16, thereby realizing defrosting of evaporator 16. The used hot water enters the inside of outer box 1401 again through side tube three 27 and collecting pipe 1403 to be heated. At the same time, the frost melts into water and is transported to the inside of outer box 1401 through drain pipe 19, collecting pipe 1403 and water pump two 1405, realizing repeated utilization of frost melting water. The operation is simple and convenient to use.

[0031] The waste heat recovery assembly 15 comprises a main air supply pipe 1501, a secondary air supply pipe 1502 and an air supply head 1503, the main air supply pipe 1501 is fixedly installed outside the main air outlet pipe 11, the outer side of the main air supply pipe 1501 is fixedly installed with the secondary air supply pipe 1502, the outer side of the secondary air supply pipe 1502 is fixedly installed with the air supply head 1503, the main air supply pipe 1501 is symmetrically distributed about the center line of the main air outlet pipe 11, the main air supply pipe 1501, the secondary air supply pipe 1502 and the air supply head 1503 are all located inside the outer box 1401, the secondary air supply pipe 1502 and the air supply head 1503 are all provided with the same plurality of, and the plurality of secondary air supply pipes 1502 and air supply heads 1503 are equally spaced, when the evaporator 16 does not need to be defrosted, the main air outlet pipe 11 can send hot air to the inside of the main air supply pipe 1501 through the three-way pipe 12, the main air supply pipe 1501 can send hot air to the inside of the outer box 1401 through the secondary air supply pipe 1502 and the air supply head 1503, through the mutual cooperation of the main air supply pipe 1501, the secondary air supply pipe 1502 and the air supply head 1503, the water inside the outer box 1401 can be heated, the steam inside the outer box 1401 can be discharged through the opening at the top, at the same time, the use of the opening at the top of the outer box 1401 can also realize the addition of water, the waste heat utilization can be realized, and the energy saving of the medium and large-sized cold storage 1 can be improved.

[0032] In use, the cold storage 1 is powered on, the compressor set 8 and the defrosting assembly 14 and the waste heat recovery assembly 15 are turned on by using the external control switch, the compressor set 8 delivers the condensate to the inside of the evaporator 16 through the air inlet pipe 17, the evaporator 16 performs heat exchange, the air outlet fan 23 blows cold air into the inside of the freezer compartment 2, the temperature inside the freezer compartment 2 is lowered, wait for a period of time, observe the thickness of the frost on the surface of the evaporator 16, when the thickness of the frost on the surface of the evaporator 16 is thin, the suction pump 25 can suck the hot air in the outdoor unit 9 into the inside of the main air outlet pipe 11 through the suction pipe 24, at this time, the three-way valve 12 is operated, the hot air in the main air outlet pipe 11 is delivered to the inside of the side pipe one 21 through the auxiliary air outlet pipe 13, at this time, the four-way valve one 20 is operated to make the air inlet pipe 17 connected with the side pipe one 21, the four-way valve two 26 is operated to make the side pipe four 28 connected with the air outlet pipe 18, the hot air flows through the coil pipe in the inside of the evaporator 16, can transfer heat to the evaporator 16, can realize defrosting of the evaporator 16, the hot air after use is discharged to the outside of the cold storage 1 through the side pipe four 28, when the thickness of the frost on the surface of the evaporator 16 is thick, the water pipe 1402 and the water pump two 1405 can deliver the hot water in the outer box 1401 to the inside of the side pipe two 22, at this time, the four-way valve one 20 and the four-way valve two 26 are operated to make the side pipe two 22 and the air inlet pipe 17 connected, make the side pipe three 27 and the air outlet pipe 18 connected, the hot water in the inside of the side pipe two 22 enters the inside of the evaporator 16 through the air inlet pipe 17, the hot water can heat the coil pipe in the inside of the evaporator 16, can realize defrosting of the evaporator 16, in the process of defrosting, the frost melts into water and is delivered to the inside of the outer box 1401 through the liquid discharge pipe 19, the collection pipe 1403 and the water pump two 1405, realizes secondary utilization of the frost melting water, after the defrosting is completed, the four-way valve one 20, the four-way valve two 26 and the three-way valve 12 are reset, at this time, the main air outlet pipe 11 can deliver the hot air to the inside of the main air inlet pipe 1501 through the three-way valve 12, the main air inlet pipe 1501 can deliver the hot air to the inside of the outer box 1401 through the auxiliary air inlet pipe 1502 and the air inlet head 1503, through the cooperation of the main air inlet pipe 1501, the auxiliary air inlet pipe 1502 and the air inlet head 1503, the water in the inside of the outer box 1401 can be heated, the steam in the inside of the outer box 1401 can be discharged through the opening at the top, the opening at the top of the outer box 1401 can be used to add water to the inside of the outer box 1401, in the process of daily use, the solar panel 3 at the top of the cold storage 1 can convert solar energy into electric energy and store it in the storage battery 5 through the inverter 6, the storage battery 5 can provide power for the cold storage 1, can reduce the energy consumption of the cold storage 1, at the same time, can improve the energy saving of the cold storage 1.

[0033] Although the embodiments of the present application have been shown and described, it is to be understood that various modifications, substitutions, replacements and changes can be made to these embodiments without departing from the principles and spirit of the present application, the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. An energy-saving defrosting system for a medium-large cold storage, comprising a cold storage (1), characterized in that: The inside of the cold storage (1) is provided with a freezing chamber (2), the top end of the cold storage (1) is fixedly installed with a solar panel (3), the outer side of the solar panel (3) is fixedly installed with a connecting line (4), the front side of the cold storage (1) is fixedly installed with a storage battery (5) and an inverter (6), the side of the cold storage (1) is fixedly installed with a side box (7), the inside of the side box (7) is fixedly installed with a compressor unit (8), the top end of the side box (7) is fixedly installed with an outdoor unit (9), the upper side of the outdoor unit (9) is provided with a top box (10), the back of the top box (10) is fixedly installed with a main air outlet pipe (11), the outer side of the main air outlet pipe (11) is provided with a tee (12), the outer side of the tee (12) is interconnected with a secondary air outlet pipe (13), the back of the side box (7) is fixedly installed with a defrosting assembly (14) and a waste heat recovery assembly (15), the inside of the freezing chamber (2) is fixedly installed with an indoor unit (29), the inside of the indoor unit (29) is fixedly installed with an evaporator (16), the outer side of the evaporator (16) is fixedly installed with an air inlet pipe (17) and an air outlet pipe (18), the front side of the indoor unit (29) is fixedly installed with an exhaust fan (23), the bottom end of the indoor unit (29) is fixedly installed with a liquid discharge pipe (19), the outer side of the air inlet pipe (17) is fixedly installed with a four-way valve (20), the outer side of the four-way valve (20) is fixedly installed with a side pipe (21) and a side pipe (22), the outer side of the air outlet pipe (18) is fixedly installed with a four-way valve (26), the outer side of the four-way valve (26) is fixedly installed with a side pipe (27) and a side pipe (28), the outdoor unit (9) and the top box (10) are provided with a suction pipe (24), the inside of the top box (10) is fixedly installed with a suction pump (25); The defrosting assembly (14) comprises an outer box (1401), a water supply pipe (1402), a collecting pipe (1403) and a water pump (1405), the outer box (1401) is fixedly installed on the back of the side box (7), the water supply pipe (1402) and the collecting pipe (1403) are both fixedly installed on the back of the outer box (1401), and the outer sides of the water supply pipe (1402) and the collecting pipe (1403) are both fixedly installed with a water pump (1405). The waste heat recovery assembly (15) comprises a main air supply pipe (1501), a secondary air supply pipe (1502) and an air supply head (1503), the main air supply pipe (1501) is fixedly installed outside the main air outlet pipe (11), the secondary air supply pipe (1502) is fixedly installed outside the main air supply pipe (1501), the air supply head (1503) is fixedly installed outside the secondary air supply pipe (1502), the solar panel (3), the inverter (6) and the battery (5) are electrically connected, the solar panel (3) is equally spaced at the top of the freezer (1), the battery (5) is electrically connected with the compressor unit (8), the outdoor unit (9) and the indoor unit (29), the main air supply pipe (1501) is symmetrically distributed about the center line of the main air outlet pipe (11), the main air supply pipe (1501), the secondary air supply pipe (1502) and the air supply head (1503) are located inside the outer box (1401), the secondary air supply pipe (1502) and the air supply head (1503) are provided with the same plurality of, and the plurality of secondary air supply pipes (1502) and air supply heads (1503) are equally spaced.

2. The energy-saving defrosting system of a medium-large cold storage according to claim 1, characterized in that: The water supply pipe (1402) is connected with the side pipe two (22), the side pipe one (21) is connected with the secondary air outlet pipe (13), the side pipe three (27) and the liquid discharge pipe (19) are connected with the collecting pipe (1403), the side pipe four (28) is connected with the outside, the liquid discharge pipe (19) extends to the inside of the indoor unit (29), and the bottom end of the indoor unit (29) is in a funnel structure.

3. The energy-saving defrosting system of a medium-large cold storage according to claim 1, characterized in that: The number of the freezing chamber (2) is the same as that of the indoor unit (29), and one-to-one correspondence, the number of the exhaust fan (23) is three times that of the indoor unit (29), and the exhaust fan (23) is equally spaced outside the indoor unit (29).

4. The energy-saving defrosting system of a medium-large cold storage according to claim 1, characterized in that: The evaporator (16) is connected with the compressor unit (8) through the air inlet pipe (17) and the air outlet pipe (18), the number of the evaporator (16) is the same as that of the indoor unit (29), and the center line of the evaporator (16) and the indoor unit (29) is located on the same straight line.

5. The energy-saving defrosting system of a medium-large cold storage according to claim 1, characterized in that: The air suction pipe (24) is provided with the same plurality of, and the outdoor unit (9) and the top box (10) are connected with each other through the air suction pipe (24), the air suction pump (25) is connected with the main air outlet pipe (11), and the lower end of the main air outlet pipe (11) extends to the inside of the outer box (1401).

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