Defrosting system applied to small-unit low-temperature air-cooled refrigerator

Abstract

The invention relates to the field of refrigeration equipment, in particular to a defrosting system applied to a small-unit low-temperature air-cooled freezer, the air-cooled freezer comprises an evaporator, a fin set is arranged in the evaporator, and the defrosting system comprises an electric heating defrosting device, a vibration defrosting device and a drainage device; the electric heating defrosting device comprises an electric heating pipe arranged at the bottom of the evaporator, and frost on the evaporator is heated through the electric heating pipe. The vibration defrosting device comprises a poking device installed on the outer side of the evaporator in a sliding mode, the poking device is driven by a driving device connected with the poking device to move, a poking piece matched with the fin set is arranged in the poking device, and the poking piece pokes the fin set to generate vibration along with movement of the poking device. The drainage device comprises a water receiving basin installed below the evaporator, the water receiving basin is obliquely arranged, a drainage plate is arranged at the bottom of the water receiving basin, and a drainage opening is formed in one side of the drainage plate in a penetrating mode. The defrosting system applied to the small-unit low-temperature air-cooled refrigerator is short in defrosting and deicing time consumption and convenient to deice and drain water.

Description

Technical Field

[0001] The invention relates to the field of refrigeration equipment, and in particular to a defrosting system applied to a small-unit low-temperature air-cooled freezer. Background Art

[0002] Small unit low temperature air-cooled freezer is a small refrigeration freezer device commonly used in the market. During the operation of the freezer, the evaporator will often be frosted. Since the thermal conductivity of frost is too small, it is one percent or even several hundredths of that of metal, so the frost layer forms a large thermal resistance. Especially when the frost layer is thick, it is like insulation, making it difficult for the cold in the evaporator to dissipate, affecting the refrigeration effect of the evaporator, and ultimately making the cold storage unable to reach the required temperature.

[0003] In the prior art, in order to solve the problem of frosting on the evaporator, a defrost system is set in the device. Usually, electric defrosting is used to heat the frost on the evaporator. When the frost is heated, it melts and falls off, thus achieving the defrost function.

[0004] However, during the defrosting process, as the temperature rises, the ice between the evaporator fin groups will gradually melt and shrink until its adhesion is less than its gravity, and the ice will fall directly from the evaporator. This process takes different amounts of time depending on the device and situation, but is generally time-consuming, that is, defrosting and de-icing by heating alone is time-consuming; at the same time, ice that has not been completely melted is difficult to discharge from the refrigerator's drainage device, and combined with the ice water and the subsequent temperature drop caused by the refrigerator starting to refrigerate after defrosting, it is easy to form stubborn ice in the drainage device, causing blockage of the drainage device, ultimately affecting the normal operation of the refrigerator. Summary of the invention

[0005] The present invention provides a defrosting system for a small-unit low-temperature air-cooled freezer, which has a short defrosting and deicing time and is convenient for defrosting and draining, so as to solve the problems raised in the above-mentioned background technology.

[0006] The technical solution adopted by the present invention is as follows: A defrost system for a small-unit low-temperature air-cooled freezer, the small-unit low-temperature air-cooled freezer comprises a mounting plate, a condenser and a compressor are arranged on the upper end of the mounting plate, a condensing fan is arranged on one side of the condenser, a heat exchange chamber is arranged at the lower end of the mounting plate, an evaporator is arranged in the heat exchange chamber, a fin group is arranged in the evaporator, the defrost system comprises: an electric defrost device, a vibration defrost device and a drainage device; the electric defrost device comprises an electric heating pipe arranged at the bottom of the evaporator, and the frost on the evaporator is heated by the electric heating pipe; the vibration defrost device comprises a toggle device slidably mounted on the outer side of the evaporator, the toggle device is driven to move by a driving device connected thereto, a toggle device is provided with a toggle piece adapted to the fin group, The paddle moves the fin group to generate vibration as the paddle device moves; the drainage device includes a water receiving basin installed below the evaporator, the water receiving basin is tilted, a drainage board is provided at the bottom of the water receiving basin, and a drainage port is provided on one side of the drainage board; a partition is horizontally installed above the drainage board in the water receiving basin, and leakage holes are arranged in an array at intervals on the partition; balls are movably installed in an array at intervals on the upper end surface of the partition; and a defrost detection device is also included, the defrost detection device includes a control unit and a sensor electrically connected to the control unit, and the sensor is arranged in the paddle device; an error elimination module is arranged in the control unit, and the error elimination module uses a statistical algorithm to set a confidence interval to exclude detection data outside the interval.

[0007] As a preferred solution of the present invention, the evaporator includes installation frames arranged on both sides, an evaporation tube in a curved and spiraled state is arranged between the installation frames, a fin group is arranged on the outer wall of the evaporation tube, and an electric heating tube is arranged between the installation frames below the fin group.

[0008] As a preferred solution of the present invention, it also includes a heat exchange chamber, one side of the heat exchange chamber is open and an evaporator is installed on the top of the heat exchange chamber, and the other side of the heat exchange chamber is provided with an evaporation fan.

[0009] As a preferred solution of the present invention, the driving device is arranged on one side of the evaporator, and a pair of mounting seats are provided at the upper and lower parts of one side of the evaporator, a screw rod is rotatably installed between the pair of mounting seats, one side of the screw rod is connected to the output end of the driving part, the upper and lower screw rods are connected by a synchronous transmission device, and a toggle device is movably installed between the upper and lower screw rods.

[0010] As a preferred solution of the present invention, the shifting device includes a pair of sliding seats respectively adapted to the upper and lower screw rods, a connecting piece is detachably fixedly installed between the sliding seats, and a shifting piece adapted to the fin group is provided on one side of the connecting piece.

[0011] As a preferred solution of the present invention, a guide rod passing through the sliding seat is further arranged between the mounting seats. The beneficial effects of the present invention are: 1. By setting up the vibration defrosting device, the toggle device can be driven to move back and forth, and the fin group can be continuously toggled to generate vibration. The ice cubes in the evaporator can be quickly dropped off through vibration, which improves the defrosting efficiency, saves time and reduces energy consumption.

[0012] 2. By setting up the drainage device, when ice cubes and ice water fall off from the evaporator, they will fall onto the partition in the water receiving basin. The ice water will flow from the leakage holes of the partition to the drainage board of the next layer, while the ice cubes will remain on the partition, thereby separating the ice water and ice cubes, avoiding the ice cubes from clogging the drainage port of the drainage board and affecting the drainage of the device.

[0013] 3. Through the cooperation of the drainage device, the vibration defrosting device and the electric defrosting device, with the cooperation of the vibration transmitted to the water basin by the toggle device and the movable ball on the water basin, the ice cubes are difficult to condense and adhere to the end surface of the partition of the water basin after falling on the partition, but continue to slide on the partition with the vibration. At the same time, the electric heating pipe not only heats the evaporator above, but also heats the ice cubes on the partition below, so that they can melt faster, and stubborn ice will not be formed in the drainage device, which will eventually affect the normal operation of the device, making it more convenient for the device to melt ice and drain. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.

[0015] Figure 2 It is a schematic diagram of the side cross-sectional structure of the present invention.

[0016] Figure 3 It is a schematic diagram of the structure of the evaporator of the present invention when viewed from above.

[0017] Figure 4 It is a front view structural schematic diagram of the evaporator of the present invention.

[0018] Figure 5 It is a schematic diagram of the side cross-sectional structure of the evaporator of the present invention.

[0019] Figure 6 It is a schematic diagram of the top view of the water receiving basin of the present invention.

[0020] Figure 7 It is a schematic diagram of the side cross-sectional structure of the water receiving basin of the present invention.

[0021] Figure 8 It is a schematic diagram of the enlarged structure of B of the present invention.

[0022] Fig. 9 It is a schematic diagram of the enlarged structure of point A of the present invention.

[0023] Fig.10 It is a side structural schematic diagram of the toggle device of the present invention.

[0024] The text labels in the figure are as follows: 1. mounting plate; 2. condenser; 3. condensing fan; 4. compressor; 5. heat exchange chamber; 51. evaporator; 511. evaporating tube; 512. fin group; 513. mounting frame; 52. electric heating tube; 53. driving device; 531. driving part; 532. synchronous transmission device; 533. mounting seat; 534. screw rod; 535. guide rod; 54. evaporating fan; 6. toggle device; 61. sliding seat; 62. connecting piece; 63. paddle; 64. sensor; 7. water collecting basin; 71. partition; 72. ball bearing; 73. water leakage hole; 74. drain board; 75. drain outlet. DETAILED DESCRIPTION

[0025] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is described in detail below in conjunction with the accompanying drawings. The description in this part is only exemplary and explanatory and should not have any limiting effect on the protection scope of the present invention.

[0026] The present invention will be further described below in conjunction with the accompanying drawings and implementation modes.

[0027] like Figure 1-10 As shown, a defrosting system applied to a small unit low-temperature air-cooled refrigerator, the small unit low-temperature air-cooled refrigerator comprises a mounting plate 1, a condenser 2 and a compressor 4 are arranged on the upper end of the mounting plate 1, a condensing fan 3 is arranged on one side of the condenser 2, a heat exchange chamber 5 is arranged at the lower end of the mounting plate 1, an evaporator 51 is arranged in the heat exchange chamber 5, a fin group 512 is arranged in the evaporator 51, and the defrosting system comprises: an electric defrosting device, a vibration defrosting device and a drainage device; The electric defrosting device includes an electric heating tube 52 disposed at the bottom of the evaporator 51. After the electric heating tube 52 is started, the electric heating tube 52 will emit a large amount of heat to increase the temperature, that is, the frost on the upper evaporator 51 is heated by the electric heating tube 52 to defrost; The vibration defrosting device includes a toggle device 6 slidably mounted on the outside of the evaporator 51, and the toggle device 6 is driven to reciprocate by a driving device 53 connected thereto. A paddle 63 adapted to the fin group 512 is arranged in the toggle device 6, and the paddle 63 paddles the fin group 512 with the reciprocating movement of the toggle device 6 to generate vibration; The drainage device includes a water receiving basin 7 installed below the evaporator 51. The upper end of the water receiving basin 7 is open and inclined. A drainage plate 74 is provided at the bottom of the water receiving basin 7. A drainage port 75 is penetrated on one side of the drainage plate 74 inclined downward. The defrosted ice water collected in the water receiving basin 7 is discharged out of the device at the drainage port 75.

[0028] like Figure 5-8 As shown, a partition plate 71 is horizontally installed above the drainage plate 74 in the water receiving basin 7, and water leakage holes 73 are evenly arranged in an array at intervals on the partition plate 71.

[0029] Specifically, the partition 71 in the water receiving basin 7 is installed horizontally to prevent the ice cubes that have fallen on the partition 71 from sliding to one side and piling up, while the ice water that has fallen on the partition 71 will flow from the leakage hole 73 of the partition 71 to the drainage board 74 of the next layer, while the ice cubes will remain on the partition 71, thereby separating the ice water from the ice cubes, avoiding the ice cubes and the ice water from flowing out of the drainage port 75 of the drainage board 74 together, preventing the ice cubes from clogging the drainage port 75 and affecting the drainage of the device, thereby further improving the drainage effect of the system.

[0030] like Figure 6-8 As shown, balls 72 are movably mounted in an array at intervals on the upper end surface of the partition 71 .

[0031] Specifically, the ball bearing 72 is a small steel ball, which will protrude when it is arranged on the upper end surface of the partition 71. The protruding portion of the ball bearing 72 will support the ice cubes that fall on the partition 71, and the movably installed ball bearings 72 are evenly arranged and distributed according to the size of the partition 71 in this embodiment. At the same time, with the cooperation of vibration, the ball bearings 72 guide the ice cubes to slide continuously to prevent the ice cubes from condensing and forming stubborn ice after falling on the partition 71.

[0032] like Figure 3-5 As shown, further, the evaporator 51 includes installation frames 513 arranged on both sides, an evaporation tube 511 in a curved and spiraled state is arranged between the installation frames 513, a fin group 512 is arranged on the outer wall of the evaporation tube 511, and an electric heating tube 52 is arranged between the installation frames 513 below the fin group 512.

[0033] Specifically, the electric heating tube 52 releases heat after being energized, thereby heating the evaporator 51 and melting the frost, and cooperates with the vibration defrosting device to further improve the defrosting efficiency of the system. At the same time, the electric heating tube 52 not only heats the evaporator 51 above, but also heats the ice cubes on the lower partition 71, so that they can melt faster, and will not form stubborn ice in the drainage device, which will eventually affect the normal operation of the device, making the ice-melting and drainage of the device more convenient and quick.

[0034] like Figure 8As shown, it also includes a defrost detection device, which includes a control unit and a sensor 64 electrically connected to the control unit and arranged in the toggle device 6. The sensor 64 is a defrost sensor, which generally adopts a temperature sensor that senses temperature. The sensed temperature signal can be transmitted to the control unit in the form of data, and the defrost time of the system is controlled by the control unit's calculation of the temperature data; that is, the sensor 64 will move with the reciprocating movement of the toggle device 6, thereby sensing different positions of the evaporator 51.

[0035] Specifically, due to the use of a vibration defrost device and an electric defrost device, the falling of ice cubes is completely random. Therefore, the defrost time of the defrost system is not fixed, but must be determined according to the specific defrost situation. If a sensor 64 is set at a fixed position in the evaporator 51, it is easy to sense a wrong signal. In the present embodiment, the sensor 64 moves with the reciprocating movement of the toggle device 6, thereby sensing different positions of the evaporator 51 and transmitting all temperature data to the control unit for integrated calculation, thereby being able to more accurately control the defrost time of the system.

[0036] The control unit is provided with an error elimination module, which uses a statistical algorithm to set a confidence interval and excludes detection data outside the interval.

[0037] Specifically, a statistical calculation method is used in the control unit to integrate and evaluate the collected temperature data, compare the evaluation results with the actual situation, and obtain a credible range of temperature data. A confidence interval is set according to the credible range. Under a given confidence level (for example, 90%), the actual value of the temperature data obtained that falls within the interval is adopted, and the value outside the interval is excluded, thereby judging the actual system defrosting process, further facilitating the device to control the defrosting time and avoiding the waste of energy and time.

[0038] like Figure 1-2 As shown, further, it also includes a heat exchange chamber 5, one side of the heat exchange chamber 5 is open and an evaporator 51 is installed on the top of the heat exchange chamber 5, the opening is the air inlet, and the other side of the heat exchange chamber 5 is provided with an evaporation fan 54.

[0039] Specifically, after the air is sucked in at the air inlet and cooled by the evaporator 51, the cold air is discharged from the air outlet through the evaporating fan 54 in the heat exchange chamber 5 to start cooling; and after the defrost system is started, the cooling work in the heat exchange chamber 5 needs to be stopped.

[0040] like Figure 2-5 as well as Fig. 9As shown, further, the driving device 53 is arranged on one side of the evaporator 51, and a pair of mounting seats 533 are arranged on the upper and lower parts of one side of the evaporator 51, a screw rod 534 is rotatably installed between the pair of mounting seats 533, one side of the screw rod 534 is connected to the output end of the driving part 531, the upper and lower screw rods 534 are connected by a synchronous transmission device 532, and a toggle device 6 is movably installed between the upper and lower screw rods 534.

[0041] Specifically, the driving device 53 is arranged on one side of the evaporator 51, and a pair of mounting seats 533 are arranged on the upper and lower parts of one side of the evaporator 51, and a screw rod 534 is rotatably installed between the pair of mounting seats 533, and one side of the screw rod 534 is connected to the output end of the driving part 531. The driving part 531 is a motor in this embodiment. After the motor is started, the screw rod 534 is driven to rotate by the rotation of the output end. The upper and lower screw rods 534 are connected by a synchronous transmission device 532. The synchronous transmission device 532 is a synchronous belt transmission mechanism. Synchronous wheels are respectively installed on the two screw rods 534. The synchronous wheels are connected by a synchronous belt so that the screw rods 534 can rotate synchronously. A toggle device 6 is movably installed between the upper and lower screw rods 534, that is, in this embodiment, the forward and reverse rotation of the screw rod 534 is controlled by the driving part 531 to drive the toggle device 6 to move back and forth.

[0042] like Fig. 9 , Fig.10 As shown, further, the toggle device 6 includes a pair of sliding seats 61 respectively adapted to the upper and lower screw rods 534, and the sliding seats 61 are provided with threaded holes adapted to the screw rods 534. A connecting member 62 is detachably fixedly installed between the sliding seats 61, and a paddle 63 adapted to the fin group 512 is provided on one side of the connecting member 62.

[0043] Specifically, the screw rod 534 is threadedly connected to the sliding seat 61, and the rotation of the screw rod 534 can drive the sliding seat 61 to move axially. A connecting piece 62 is detachably fixedly installed between the sliding seats 61, and the replacement and maintenance can be further facilitated by assembling and disassembling the connecting piece 62. The paddle 63 is adapted to the fin group 512, and the size of the paddle 63 is adapted to the size and thickness of the fins in the fin group 512. In this embodiment, the paddle 63 uses an elastic plastic paddle to avoid scratching the edge of the fin during the plucking process, thereby avoiding damage to the fin.

[0044] like Figure 4 As shown, further, a guide rod 535 passing through the sliding seat 61 is arranged between the mounting seats 533 , and the reciprocating movement of the toggle device 6 is made smoother by the setting of the guiding function of the guide rod 535 .

[0045] Working principle: the compressor 4 starts and cooperates with the condenser 2, evaporator 51 and other devices to start refrigeration (the general principle of the refrigeration device is the existing technology and will not be elaborated on); when the system is used for defrosting, the refrigeration is stopped, the electric heating tube 52 is started first to start heating the evaporator 51, and the driving device 53 is started at the same time. The screw rod 534 is controlled to rotate by the driving part 531, thereby driving the toggle device 6 to move. During the movement of the toggle device 6, the paddle 63 will continuously and briefly touch the fins in the fin group 512 to generate vibration, and the ice in the evaporator 51 will fall off quickly through the coordination of vibration and heating. At the same time, the ice cubes and ice water that fall off from the evaporator 51 will fall into the water receiving basin 7, wherein the ice water will flow from the leaking hole 73 of the partition 71 to the drain plate 74 of the next layer, while the ice cubes will remain on the partition 71. With the cooperation of the vibration transmitted to the water receiving basin 7 by the toggle device and the movable ball 72 on the water receiving basin 7, the ice cubes will be difficult to condense and adhere to the upper end surface of the partition 71 of the water receiving basin 7 after falling on the partition 71, but will continue to slide on the partition 71 with the vibration. At the same time, the electric heating tube 52 not only heats the evaporator 51 above, but also heats the ice cubes on the partition 71 below, so that they can melt faster. The melted ice water will flow down from the leaking hole 73 on the partition 71, and the drain plate 74 will discharge the ice water from the device from the drain port 75 on the inclined side. During the defrosting process, the sensor 64 provided in the toggle device 6 will move with the reciprocating movement of the toggle device 6, thereby sensing different positions in the evaporator 51 and transmitting all temperature data to the control unit. The control unit adopts a statistically based calculation method to integrate and evaluate the collected temperature data, compare the evaluation result with the actual situation, and obtain a credible range of the temperature data; a confidence interval is set according to the credible range, and at a given confidence level (for example, 90%), the actual value of the temperature data obtained that falls within the interval is adopted, and the value outside the interval is excluded, thereby judging the actual system defrosting process. When an accurate temperature data is obtained and it is determined that the defrosting is completed at this time, the control unit will issue an instruction to stop the heating of the electric heating tube 52 and drive the toggle device 6 to reset through the driving unit 531, thereby completing the entire defrosting process of the defrosting system.

[0046] During the above-mentioned whole process, the system can drive the toggle device 6 to move back and forth through the setting of the vibration defrosting device, continuously toggle the fin group 512 to make it vibrate, and make the ice cubes in the evaporator 51 fall off quickly through the vibration, so as to improve the defrosting efficiency, save time and reduce energy consumption; through the setting of the drainage device, when the ice cubes and ice water fall off from the evaporator 51, they will fall on the partition 71 in the water receiving basin 7, wherein the ice water will flow from the leakage hole 73 of the partition 71 to the drainage board 74 of the next layer, and the ice cubes will remain on the partition 71, thereby separating the ice water and the ice cubes, and preventing the ice cubes from clogging the drainage port 75 of the drainage board 74 and affecting the drainage of the device; through the cooperation of the drainage device with the vibration defrosting device and the electric heating defrosting device, under the vibration transmitted to the water receiving basin 7 by the toggle device 6 and the cooperation of the movable ball 72 on the water receiving basin 7, the ice cubes After the ice cubes fall on the partition 71, it is difficult for them to be fixed and condensed and attached to the upper end surface of the partition 71 of the water receiving basin 7, but they continue to slide on the partition 71 with the vibration. At the same time, the electric heating tube 52 not only heats the evaporator 51 above, but also heats the ice cubes on the partition 71 below, so that they can melt faster and will not form stubborn ice in the drainage device, which will eventually affect the normal operation of the device, making it more convenient for the device to defrost and drain water; through the cooperation of the defrost detection device and the toggle device 6, the sensor 64 will move with the reciprocating movement of the toggle device 6, so as to sense the different positions of the evaporator 51, and the error elimination module in the control unit will adopt the true value of the temperature data that falls within the confidence interval and exclude the value outside the confidence interval, so as to judge the real system defrosting process, which further facilitates the control of the defrosting time of the device and avoids the waste of energy and time.

[0047] It should be noted that, in this article, the terms "include", "comprises" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method of the present invention and its core idea. The above is only a preferred implementation method of the present invention. It should be pointed out that due to the limitations of textual expression, there are objectively infinite specific structures. For ordinary technicians in this technical field, without departing from the principle of the present invention, several improvements, modifications or changes can be made, and the above technical features can be combined in an appropriate manner; these improvements, modifications, changes or combinations, or the direct application of the concept and technical solution of the invention to other occasions without improvement, should be regarded as the scope of protection of the present invention.

Claims

1. A defrosting system for a small unit low-temperature air-cooled refrigerator, the small unit low-temperature air-cooled refrigerator comprising a mounting plate (1), a condenser (2) and a compressor (4) being arranged at the upper end of the mounting plate (1), a condensing fan (3) being arranged on one side of the condenser (2), a heat exchange chamber (5) being arranged at the lower end of the mounting plate (1), an evaporator (51) being arranged in the heat exchange chamber (5), a fin group (512) being arranged in the evaporator (51), and the evaporator (51) being arranged in the evaporator (51), wherein the fin group (512) is arranged, and the defrosting system comprises a mounting plate (1), a condenser (2) and a compressor (4) being arranged at the upper end of the mounting plate (1), a condensing fan (3) being arranged on the one side of the condenser (2), a heat exchange chamber (5) being arranged at the lower end of the mounting plate (1), an evaporator (51) being arranged in the heat exchange chamber (5), and a fin group (512) being arranged in the evaporator (51), and the evaporator (51) being arranged in the evaporator (51), characterized in that: The defrosting system comprises: an electric defrosting device, a vibration defrosting device and a drainage device; The electric defrosting device comprises an electric heating tube (52) arranged at the bottom of the evaporator (51), and frost on the evaporator (51) is heated by the electric heating tube (52); The vibration defrosting device comprises a toggle device (6) slidably mounted on the outside of the evaporator (51); the toggle device (6) is driven to move by a driving device (53) connected thereto; a paddle (63) adapted to the fin group (512) is arranged in the toggle device (6); the paddle (63) moves the fin group (512) to generate vibration as the toggle device (6) moves; The drainage device comprises a water receiving basin (7) installed below the evaporator (51), the water receiving basin (7) being arranged at an angle, a drainage plate (74) being arranged at the bottom of the water receiving basin (7), and a drainage port (75) being arranged through one side of the drainage plate (74); a partition plate (71) being horizontally installed above the drainage plate (74) in the water receiving basin (7), water leakage holes (73) being arranged in an array at intervals on the partition plate (71), and balls (72) being movably installed in an array at intervals on the upper end surface of the partition plate (71); It also includes a defrost detection device, the defrost detection device including a control unit and a sensor (64) electrically connected to the control unit, the sensor (64) being arranged in the toggle device (6); an error elimination module is arranged in the control unit, the error elimination module uses a statistical algorithm to set a confidence interval and excludes detection data outside the interval.

2. The defrosting system for a small-unit low-temperature air-cooled freezer according to claim 1, characterized in that: The evaporator (51) comprises mounting frames (513) arranged on both sides, an evaporation tube (511) in a curved and spiraled state is arranged between the mounting frames (513), a fin group (512) is sleeved on the outer wall of the evaporation tube (511), and an electric heating tube (52) is arranged below the fin group (512) between the mounting frames (513).

3. A defrosting system for a small-unit low-temperature air-cooled freezer according to any one of claims 1-2, characterized in that: It also comprises a heat exchange chamber (5), one side of the heat exchange chamber (5) is open and an evaporator (51) is installed on the top of the heat exchange chamber (5), and the other side of the heat exchange chamber (5) is provided with an evaporation fan (54).

4. The defrosting system for a small-unit low-temperature air-cooled freezer according to claim 3, characterized in that: The driving device (53) is arranged on one side of the evaporator (51), and a pair of mounting seats (533) are arranged at the upper and lower parts of one side of the evaporator (51). A screw rod (534) is rotatably mounted between the pair of mounting seats (533), one side of the screw rod (534) is connected to the output end of the driving part (531), the upper and lower screw rods (534) are connected by a synchronous transmission device (532), and a toggle device (6) is movably mounted between the upper and lower screw rods (534).

5. The defrosting system for a small-unit low-temperature air-cooled freezer according to claim 4, characterized in that: The shifting device (6) comprises a pair of sliding seats (61) respectively adapted to the upper and lower screw rods (534), a connecting piece (62) being detachably fixedly mounted between the sliding seats (61), and a shifting piece (63) adapted to the fin assembly (512) being provided on one side of the connecting piece (62).

6. The defrosting system for a small-unit low-temperature air-cooled freezer according to claim 5, characterized in that: A guide rod (535) passing through the sliding seat (61) is also provided between the mounting seats (533).

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