Refrigeration equipment for cold storage facilitating automatic defrosting

Abstract

This invention discloses a refrigeration equipment for cold storage that facilitates automatic defrosting. It includes an indoor air cooler and an outdoor unit. The indoor air cooler includes an evaporator, with defrosting and defrosting components at both its upper and lower ends. A water collection tray is located below the defrosting components. A compressor is housed inside the outdoor unit, and a waste heat recovery component is installed on the outer circumference of the compressor. This waste heat recovery component includes a heat exchange sleeve and a heat pump. This refrigeration equipment for cold storage that facilitates automatic defrosting reduces defrosting energy consumption by recovering waste heat from the compressor casing and using it for defrosting via a heat pump. Furthermore, it employs a non-contact defrosting method combining heating softening and ultrasonic vibration to improve defrosting reliability. Additionally, a wedge-shaped water collection tray quickly drains accumulated water, and a water level sensor, linked with an anti-clogging heating element, enables on-demand heating to clear the drain outlet, effectively solving the problem of secondary icing.

Description

Technical Field

[0001] This invention relates to the field of defrosting technology for refrigeration equipment, specifically to a refrigeration equipment for cold storage that facilitates automatic defrosting. Background Technology

[0002] During long-term operation, refrigeration equipment used in cold storage will experience a decrease in heat exchange efficiency due to frost buildup on the evaporator surface. To address this issue, various defrosting solutions have been developed in the existing technology.

[0003] Analysis reveals the following main problems with existing technologies: Electric defrosting, currently the most widely used method, consumes 20%–30% of the total energy of the refrigeration system. While hot air defrosting has lower energy consumption, it requires a complex pipeline bypass system. Neither method fully utilizes the waste heat generated by the refrigeration system itself. Furthermore, while some attempts have been made to use mechanical structures like scrapers to directly contact the evaporator fins for defrosting, in the low-temperature, high-humidity environment of cold storage, the transmission mechanism is prone to jamming due to frost intrusion. The rigid contact between the scraper and the dense fins also easily leads to structural damage, making this type of solution difficult to operate stably in practical applications. Secondly, the existing equipment's drip trays are mostly horizontal or have a slight slope, resulting in slow drainage. The defrost water easily refreezes in low-temperature environments, clogging the drain outlet. If drainage is obstructed, water will overflow the drip tray, forming an ice layer on the cold storage floor, posing a safety hazard. Summary of the Invention

[0004] The purpose of this section is to outline some aspects of the embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the invention.

[0005] 1. Technical problems to be solved:

[0006] To address the problems mentioned above, such as high energy consumption during the defrosting process, insufficient operational reliability of existing mechanical defrosting structures, and the tendency for defrosting water to refreeze after defrosting, this invention is proposed.

[0007] Therefore, the purpose of this invention is to provide a refrigeration equipment for cold storage that facilitates automatic defrosting. By recovering the waste heat of the compressor casing and boosting it through a heat pump for defrosting, the defrosting heat source mainly comes from the system's waste heat, reducing additional energy consumption. At the same time, a non-contact defrosting method combining heating and softening with ultrasonic vibration is adopted, eliminating mechanical scraping parts and avoiding problems such as ice jamming and mechanical wear. Furthermore, a wedge-shaped water tray is used to quickly guide accumulated water, and through the linkage of a water level sensor and an anti-clogging electric heating element, heating and unblocking the drain outlet as needed can be achieved, effectively solving the problem of secondary icing.

[0008] 2. Technical Solution:

[0009] To address the aforementioned technical problems, according to one aspect of the present invention, the present invention provides the following technical solution:

[0010] A refrigeration device for cold storage that facilitates automatic defrosting includes an indoor air cooler and an outdoor unit. The indoor air cooler includes an outer frame, an evaporator is disposed inside the outer frame, defrosting components are disposed at both the upper and lower ends of the evaporator, a defrosting component is disposed at the bottom of the evaporator, and a water collection tray is disposed below the defrosting component.

[0011] A compressor is installed on the left side of the inner cavity of the outdoor unit. A waste heat recovery assembly is installed on the outer circumference of the compressor. The waste heat recovery assembly includes a heat exchange sleeve. A heat pump is installed above the heat exchange sleeve. A condenser is installed at the output end of the compressor. A liquid storage tank is installed at the output end of the condenser.

[0012] As a preferred embodiment of the refrigeration equipment for cold storage that facilitates automatic defrosting according to the present invention, the heat exchange sleeve is a hollow annular structure, and its inner circumferential wall is located in the upper middle part of the outer circumferential wall of the compressor. The inner circumferential wall of the heat exchange sleeve is provided with heat exchange grooves. The top of the heat exchange sleeve is provided with multiple heat exchange medium interfaces, one of which is connected to the input end of the heat pump through a pipeline. The output end of the heat pump is provided with an expansion valve.

[0013] As a preferred embodiment of the refrigeration equipment for cold storage that facilitates automatic defrosting according to the present invention, the defrosting assembly includes a defrosting tube, an upper heating tube, and a lower heating tube. Both the upper and lower heating tubes have an S-shaped structure. The upper heating tube is located above the evaporator, and the lower heating tube is located below the defrosting tube. The defrosting tube is arranged close to the lower surface of the evaporator. The input end of the defrosting tube is connected to the output end of the expansion valve through a pipeline. The upper heating tube, the lower heating tube, and the top of the defrosting tube are all fixedly connected to the outer frame through connectors.

[0014] As a preferred embodiment of the refrigeration equipment for cold storage that facilitates automatic defrosting according to the present invention, the connecting member includes a fixed crossbeam, the two sides of which are fixedly connected to the inner sidewall of the outer frame, and the bottom of the fixed crossbeam is provided with multiple fixing plates, all of which are semi-circular structures.

[0015] As a preferred embodiment of the refrigeration equipment for cold storage that facilitates automatic defrosting according to the present invention, the water receiving tray has a wedge-shaped structure with its bottom surface unidirectionally inclined along its length. The top of the water receiving tray has an integrally formed baffle, and multiple water level sensors are embedded in the outer wall of the baffle. The top outer side of the water receiving tray has an integrally formed connecting edge. The bottom of the water receiving tray is provided with an anti-clogging electric heating tube. A drain pipe is welded to the bottom of the water receiving tray, and the outlet end of the drain pipe extends to the outside through the outer frame. The outer wall of the outer frame is provided with multiple anti-cold bridge lifting lugs, each of which includes a lifting ring, and an outer sleeve is fitted around the circumferential outer wall of the lifting ring.

[0016] As a preferred embodiment of the refrigeration equipment for cold storage that facilitates automatic defrosting according to the present invention, the defrosting assembly includes a vibration plate, the upper surface of which is fixedly connected to the lower surface of the evaporator, and a plurality of transducers are provided at the bottom of the vibration plate.

[0017] As a preferred embodiment of the refrigeration equipment for cold storage that facilitates automatic defrosting according to the present invention, the upper and lower ends of the outer frame are respectively provided with multiple air inlets and multiple air outlets. A circular dustproof net is provided on the top of the air inlet, and an axial flow fan is provided on the inner circumference of the air outlet. Multiple support arms are provided on the inner side wall of the outer frame, and the upper surfaces of the multiple support arms support the lower edge of the evaporator. Multiple mounting edges are integrally formed on the inner side wall of the outer frame, and the upper surfaces of the mounting edges are fixedly connected to the lower surfaces of the connecting edges.

[0018] As a preferred embodiment of the refrigeration equipment for cold storage that facilitates automatic defrosting according to the present invention, junction boxes two, three, and four are respectively provided on the side of the outer frame. Junction box two is electrically connected to the axial flow fan, junction box three is electrically connected to the upper heating tube and the lower heating tube, and junction box four is electrically connected to the anti-clogging heating tube.

[0019] As a preferred embodiment of the refrigeration equipment for cold storage that facilitates automatic defrosting according to the present invention, the output end of the liquid storage tank is provided with a drying filter, the output end of the drying filter is provided with an expansion valve II, and the output end of the expansion valve II is connected to the input end of the evaporator through a pipeline.

[0020] As a preferred embodiment of the refrigeration equipment for cold storage that facilitates automatic defrosting according to the present invention, the outdoor unit is provided with square dustproof nets on both the front and rear sides. Multiple cooling fans are provided on the inner wall of the outdoor unit, located on the air outlet side of the condenser. Multiple suspension arms are provided on both sides of the condenser, with the tops of the suspension arms fixedly connected to the top of the inner cavity of the outdoor unit. The rear wall of the outdoor unit has two clearance holes: one for refrigeration pipes and another for waste heat recovery pipes. A damping pad is provided between the bottom of the inner cavity of the outdoor unit and the bottom of the compressor. A junction box is provided on the rear side of the outdoor unit, electrically connected to the compressor, the heat pump, and the multiple cooling fans.

[0021] 3. Beneficial effects:

[0022] Compared with the prior art, the beneficial effects of the present invention are:

[0023] This type of refrigeration equipment for cold storage that facilitates automatic defrosting recovers the waste heat generated by the compressor casing during operation by setting up a waste heat recovery component. The waste heat is then raised by a heat pump and used for defrosting. This design makes the defrosting heat source mainly come from the system's own waste heat. Compared with the electric heating defrosting described in the background technology, the defrosting process requires less additional electrical energy, thus achieving low-energy defrosting.

[0024] This type of refrigeration equipment for cold storage, which facilitates automatic defrosting, adopts a defrosting method that combines heating and softening with ultrasonic vibration. First, the frost layer is heated through the defrosting tube to reduce its adhesion to the fin surface. Then, the ultrasonic transducer is activated to cause the entire evaporator to vibrate at high frequency and micro-amplitude, thereby shaking off the softened frost layer. This process does not involve any mechanical scraping parts that directly contact the fins, thus avoiding frost jamming and mechanical wear in principle, resulting in higher reliability of the defrosting action.

[0025] This type of refrigeration equipment for cold storage, which facilitates automatic defrosting, employs a wedge-shaped water collection tray combined with a water level sensor and an anti-clogging heating element. The inclined bottom of the wedge-shaped water collection tray allows water and frost to flow quickly to the drain under gravity, reducing water retention time. When drainage is obstructed and water rises to the level that triggers the water level sensor, the anti-clogging heating element activates, heating the bottom of the water collection tray to melt ice crystals and clear the drain. This design achieves on-demand heating for freeze protection, rather than continuous heating, thus solving the problem of secondary icing. Attached Figure Description

[0026] To more clearly illustrate the technical solutions of the embodiments of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and detailed embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein:

[0027] Figure 1 This is a schematic diagram of the overall structure of a refrigeration equipment for cold storage that facilitates automatic defrosting according to the present invention;

[0028] Figure 2 This is a rear view of the outdoor unit of a refrigeration equipment for cold storage that facilitates automatic defrosting, according to the present invention.

[0029] Figure 3 This is a schematic diagram of the internal structure of the outdoor unit of a refrigeration equipment for cold storage that facilitates automatic defrosting, according to the present invention.

[0030] Figure 4 This is a schematic diagram of the heat exchange sleeve structure of a refrigeration equipment for cold storage that facilitates automatic defrosting according to the present invention;

[0031] Figure 5 This is a bottom view of the indoor air cooler of a refrigeration equipment for cold storage that facilitates automatic defrosting, according to the present invention.

[0032] Figure 6 This is a schematic diagram of the internal structure of the outer frame of a refrigeration equipment for cold storage that facilitates automatic defrosting according to the present invention;

[0033] Figure 7 This is a schematic diagram of the water tray structure of a refrigeration equipment for cold storage that facilitates automatic defrosting according to the present invention;

[0034] Figure 8 This is a schematic diagram of the defrosting component structure of a refrigeration equipment for cold storage that facilitates automatic defrosting according to the present invention;

[0035] Figure 9 This is a schematic diagram of the connecting component structure of a refrigeration equipment for cold storage that facilitates automatic defrosting according to the present invention;

[0036] Figure 10 This is a schematic diagram of the anti-cold bridge hanger structure of a refrigeration equipment for cold storage that facilitates automatic defrosting, according to the present invention.

[0037] Explanation of the numbers in the diagram: 1. Indoor air cooler; 2. Outdoor unit casing; 3. Expansion valve one; 4. Clearance hole one; 5. Clearance hole two; 6. Expansion valve two; 7. Dryer filter; 8. Junction box one; 9. Heat pump; 10. Heat exchanger jacket; 11. Compressor; 12. Damping pad; 13. Suspension arm; 14. Condenser; 15. Cooling fan; 16. Liquid receiver; 17. Heat exchanger groove; 18. Anti-cold bridge lifting lug; 19. Outer frame; 20. Junction box two; 21. Wiring. 21. Junction Box 3; 22. Junction Box 4; 23. Axial Flow Fan; 24. Defrosting Assembly; 25. Evaporator; 26. Water Drain Pan; 27. Drain Pipe; 28. Upper Heating Element; 29. ​​Defrosting Element; 30. Lower Heating Element; 31. Support Arm; 32. Water Level Sensor; 33. Anti-clogging Heating Element; 34. Mounting Edge; 35. Edge Block; 36. Connecting Edge; 37. Fixing Plate; 38. Fixing Beam; 39. Lifting Ring; 40. Outer Tube; 41. Vibration Transmission Plate; 42. Transducer. Detailed Implementation

[0038] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0039] This invention is described in detail with reference to the schematic diagrams. When describing the embodiments of this invention, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged, not according to the usual scale. Furthermore, the schematic diagrams are merely examples and should not be construed as limiting the scope of protection of this invention. In actual fabrication, the three-dimensional spatial dimensions of length, width, and depth should be included.

[0040] The orientation or positional relationship indicated in the terminology is based on the orientation or positional relationship shown in the accompanying drawings and is only for the convenience of describing the invention and simplifying the description, and is not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention.

[0041] The term "connection method" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0042] The embodiments of the present invention will now be described in further detail with reference to the accompanying drawings.

[0043] This invention provides a schematic diagram of the overall structure of an embodiment of a refrigeration device for cold storage that facilitates automatic defrosting, comprising:

[0044] Please see Figures 1-10This embodiment of a refrigeration equipment for cold storage that facilitates automatic defrosting includes an indoor air cooler 1 and an outdoor unit 2. The indoor air cooler 1 includes an outer frame 19, and an evaporator 25 is arranged inside the outer frame 19. The evaporator is a finned evaporator as in the prior art, which is used to absorb heat inside the cold storage to achieve a cooling effect. Defrosting components 24 are arranged at both the upper and lower ends of the evaporator 25, and a defrosting component is arranged at the bottom of the evaporator 25. A water collection tray 26 is arranged below the defrosting component.

[0045] A compressor 11 is installed on the left side of the inner cavity of the outdoor unit 2. This is existing technology and is used to compress and drive the refrigerant circulation. The waste heat of the casing during its operation is one of the main sources of waste heat recovery in this patent. A waste heat recovery component is installed on the outer circumference of the compressor 11. The waste heat recovery component includes a heat exchange tube 10 for recovering the waste heat of the compressor 11 casing. A heat pump 9 is installed above the heat exchange tube 10. This is a micro heat pump module in the prior art, used to raise the low-grade waste heat recovered by the heat exchange tube to a temperature suitable for defrosting (40-50℃). A condenser 14 is installed at the output end of the compressor 11. This is existing technology and is used to cool and liquefy the high-temperature and high-pressure gaseous refrigerant discharged by the compressor 11. A liquid storage tank 16 is installed at the output end of the condenser 14 for storing the high-pressure liquid refrigerant after liquefaction by the condenser and regulating the system circulation volume.

[0046] It is worth noting that, in order to facilitate the absorption of waste heat from the compressor 11, the heat exchange sleeve 10 is a hollow annular structure, and its inner circumference is fixed to the upper part of the outer circumference of the compressor 11 by a clamp. The inner circumference of the heat exchange sleeve 10 is laser-etched with heat exchange grooves 17 to increase the contact area and improve the heat exchange efficiency. The top of the heat exchange sleeve 10 is integrally formed with multiple heat exchange medium interfaces. One of the heat exchange medium interfaces is connected to the input end of the heat pump 9 through a pipeline. The output end of the heat pump 9 is equipped with an expansion valve 3, and the output end of the expansion valve 3 is connected to the input end of the defrosting pipe 29 through a pipeline.

[0047] Next, to defrost the surface of the evaporator 25, specifically, the defrosting assembly 24 includes a defrosting tube 29, an upper heating tube 28, and a lower heating tube 30. Both the upper heating tube 28 and the lower heating tube 30 have an S-shaped structure. The upper heating tube 28 is located above the evaporator 25, and the lower heating tube 30 is located below the defrosting tube 29. Both the upper heating tube 28 and the lower heating tube 30 are stainless steel heating tubes in the prior art, and mainly serve as backup heat sources for electric defrosting when the heat pump 9 cannot work or under extremely cold conditions. The defrosting tube 29 is arranged close to the lower surface of the evaporator 25. The defrosting tube 29 receives the high-temperature medium from the heat pump 9 to heat and soften the frost layer. Its material is copper. The input end of the defrosting tube 29 is connected to the output end of the expansion valve 3 through a pipeline. The upper heating tube 28, the lower heating tube 30, and the upper part of the defrosting tube 29 are all fixedly connected to the outer frame 19 through connectors.

[0048] Meanwhile, in order to securely install the defrosting assembly, the connecting components include a fixed crossbeam 38. The two sides of the fixed crossbeam 38 are fixedly connected to the inner sidewall of the outer frame 19 by bolts. The bottom of the fixed crossbeam 38 is connected to multiple fixing plates 37 by bolts. All of the fixing plates 37 are semi-circular structures.

[0049] Furthermore, to facilitate defrosting and drainage, the drip tray 26 has a wedge-shaped structure with its bottom surface unidirectionally inclined along its length. The top of the drip tray 26 has an integrally formed baffle 35 to prevent defrosting water from overflowing from the sides. Multiple water level sensors 32 are embedded in the outer wall of the baffle 35; these are electrode-type water level sensors in the prior art, requiring an external power supply and control system. When the accumulated water reaches a set threshold, a signal is sent to the external control system, ultimately triggering the anti-clogging heating element 33 to activate, achieving on-demand heating. The top outer side of the drip tray 26 also has an integrally formed connecting edge 36. The bottom of the water tray 26 is fixedly connected to an anti-clogging electric heating tube 33 by a metal clamp, which is used to heat the bottom of the water tray 26, melt ice crystals, and unclog the drain. A drain pipe 27 is welded to the bottom of the water tray 26. The outlet end of the drain pipe 27 extends to the outside through the outer frame 19. Multiple anti-cold bridge lugs 18 are provided on the outer side wall of the outer frame 19, which are used to suspend the indoor air cooler 1 on the top plate of the cold storage and block the cold bridge. The anti-cold bridge lugs 18 include a hanging ring 39. The outer circumference of the hanging ring 39 is fitted with an outer sleeve 40, which is made of nylon. Nylon has a very low thermal conductivity, which effectively prevents the cold energy from being conducted to the top of the cold storage through the metal hanging ring.

[0050] It is worth noting that, in order to facilitate the removal of the softened frost layer after heating, the defrosting assembly specifically includes a vibration plate 41, which is used to transmit the mechanical vibration of ultrasonic waves. The plate is made of aluminum alloy. The upper surface of the vibration plate 41 is fixedly connected to the lower surface of the evaporator 25. The bottom of the vibration plate 41 is connected to multiple transducers 42 by screws. These are piezoelectric ceramic ultrasonic transducers in the prior art. The high-frequency vibration causes the softened frost layer to break and fall off as a whole, thus achieving non-contact defrosting.

[0051] Preferably, to facilitate the installation of the indoor air cooler 1, the upper and lower ends of the outer frame 19 are respectively provided with multiple air inlets and multiple air outlets. The top of the air inlet is fixed with a circular dustproof net by screws, and the inner circumference of the air outlet is connected with an axial flow fan 23 by bolts. The inner side wall of the outer frame 19 is provided with multiple support arms 31, the upper surface of the multiple support arms 31 is supported on the lower edge of the evaporator 25, and the inner side wall of the outer frame 19 is integrally formed with multiple mounting edges 34, the upper surface of the mounting edges 34 is fixedly connected to the lower surface of the connecting edges 36.

[0052] Meanwhile, to facilitate the electrical connection of the internal structure of the indoor air cooler 1, specifically, junction boxes 20, 21, and 22 are respectively provided on the side of the outer frame 19 for electrical connection and circuit protection, separating the electrical circuits of different functions for management, improving safety and maintenance convenience. Junction box 20 is electrically connected to the axial flow fan 23, junction box 321 is electrically connected to the upper heating tube 28 and the lower heating tube 30, and junction box 22 is electrically connected to the anti-blocking heating tube 33.

[0053] Secondly, in order to achieve the connection of the cooling pipeline, specifically, a dryer filter 7 is installed at the output end of the liquid receiver 16. This is existing technology, which is used to absorb moisture in the refrigerant and filter impurities to prevent ice blockage of the expansion valve 6. The output end of the dryer filter 7 is connected to the expansion valve 6 through a pipeline. This is existing technology, which is used to throttle and reduce pressure in the main refrigeration circuit and control the flow of refrigerant entering the evaporator. The output end of the expansion valve 6 is connected to the input end of the evaporator 25 through a pipeline.

[0054] Finally, to facilitate the installation of the internal structure of the outdoor unit 2, specifically, square dustproof nets are fixed to both the front and rear sides of the outdoor unit 2 with screws. Multiple cooling fans 15 are bolted to the inner wall of the outdoor unit 2 to force airflow over the condenser 14 and accelerate heat dissipation. The multiple cooling fans 15 are located on the air outlet side of the condenser 14. Multiple suspension arms 13 are bolted to both sides of the condenser, and the tops of the multiple suspension arms 13 are bolted to the top of the inner cavity of the outdoor unit 2. The rear wall of the outdoor unit 2 has clearance holes for the refrigerant pipes to pass through. The first hole 4 and the second hole 5, through which the waste heat recovery pipeline passes, facilitate the user's connection of external pipes. The first hole 4 is used for the pipeline connection between the output end of the evaporator 25 and the input end of the compressor 11. The second hole 5 is used for the pipeline connection between the output end of the defrosting pipe 29 and the input end of the heat exchange jacket 10. A damping pad 12 is placed between the bottom of the inner cavity of the outdoor unit 2 and the bottom of the compressor 11 to absorb the vibration of the compressor 11 during operation. A junction box 8 is provided on the rear side of the outdoor unit 2. The junction box 8 is electrically connected to the compressor 11, the heat pump 9 and multiple cooling fans 15.

[0055] In addition, the circuits, electronic components and modules involved in this invention are all existing technologies, which can be fully implemented by those skilled in the art, and need not be elaborated upon. The content protected by this invention does not involve any improvement to the internal structure and method.

[0056] Combination Figures 1-10 The following is a description of a refrigeration device for cold storage that facilitates automatic defrosting, and its specific usage process:

[0057] 1. After the equipment is started, the compressor 11 in the outdoor unit 2 starts to run, compressing the low-temperature, low-pressure refrigerant vapor into a high-temperature, high-pressure gas and sending it to the condenser 14. In the condenser 14, the refrigerant gas is cooled by the air forced through by the cooling fan 15 and liquefied into a high-pressure liquid. It then flows into the liquid storage tank 16 for storage. After the high-pressure liquid refrigerant in the liquid storage tank 16 is filtered by the dryer filter 7 to remove moisture and impurities, it flows through the expansion valve 6 and is throttled and depressurized into a low-temperature, low-pressure gas-liquid mixture. Then it enters the evaporator 25 in the indoor air cooler 1. In the evaporator 25, the low-temperature refrigerant absorbs heat from the air inside the cold storage and evaporates. At the same time, the air driven by the axial fan 23 is cooled after flowing through the fins of the evaporator 25 and blown out from the air outlet to achieve refrigeration. The evaporated refrigerant vapor is finally drawn back into the compressor 11 to complete the entire refrigeration cycle.

[0058] 2. When the equipment reaches the preset defrosting conditions, the control system first instructs the compressor 11 to stop running and shuts down the axial fan 23. Subsequently, the system starts the waste heat recovery process: the heat exchange sleeve 10 covering the outer wall of the compressor 11 absorbs the residual shell heat after the compressor 11 stops. The heat is transferred to the heat pump 9 through the pipeline. The heat pump 9 raises the temperature of this low-grade waste heat and then sends it through the expansion valve 3 to the defrost pipe 29, which is close to the lower surface of the evaporator 25. The defrost pipe 29 briefly heats the frost layer on the surface of the evaporator 25, making it adhere to the fin surface. As the adhesion of the frost decreases, after the heating is completed, the control system starts the ultrasonic transducer 42. The high-frequency vibration generated by the transducer 42 is transmitted to the entire evaporator 25 through the vibration plate 41, causing the softened frost layer to fall off as a whole. The detached frost and defrosting water fall into the wedge-shaped water receiving tray 26 below, and flow quickly along the inclined bottom surface to the drain and out of the cold storage. If the defrosting water accumulates in the water receiving tray 26 due to the low temperature and triggers the water level sensor 32, the anti-blocking electric heating tube 33 will be automatically activated to heat the bottom of the water receiving tray 26, melt the ice crystals to clear the drain and ensure smooth drainage.

[0059] 3. When the waste heat recovery system malfunctions or the cold storage is in extremely cold conditions, resulting in insufficient waste heat recovery efficiency, the operator can switch to manual defrosting mode. First, stop the compressor 11 and axial fan 23. Then, start the upper heating element 28 and lower heating element 30 through junction box 3 21. Both the upper heating element 28 and lower heating element 30 are S-shaped structures, respectively arranged above and below the evaporator 25. After being powered on, they electrically heat the upper and lower surfaces of the evaporator 25 to directly melt the frost layer. During the defrosting process, the defrosting water also falls into the wedge-shaped water receiving pan 26 below and is discharged. At the same time, the operator can manually start the anti-blockage heating element 33 through junction box 4 22 to heat the water receiving pan 26 to prevent the drain outlet from freezing. After the frost layer has completely melted and the accumulated water has been drained, the operator turns off the heating element, restarts the compressor 11 and axial fan 23, and restores normal refrigeration operation.

[0060] Although the present invention has been described above with reference to embodiments, various modifications can be made and components can be replaced with equivalents without departing from the scope of the invention. In particular, as long as there is no structural conflict, the features in the disclosed embodiments can be combined with each other in any manner. The lack of an exhaustive description of these combinations in this specification is merely for the sake of brevity and resource conservation. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A refrigeration device for cold storage that facilitates automatic defrosting, characterized in that, Includes: an indoor air cooler (1) and an outdoor unit (2). The indoor air cooler (1) includes an outer frame (19). An evaporator (25) is provided inside the outer frame (19). Defrosting components (24) are provided at both the upper and lower ends of the evaporator (25). A defrosting component is provided at the bottom of the evaporator (25). A water collection tray (26) is provided below the defrosting component. A compressor (11) is provided on the left side of the inner cavity of the outdoor unit (2). A waste heat recovery assembly is provided on the outer circumference of the compressor (11). The waste heat recovery assembly includes a heat exchange sleeve (10). A heat pump (9) is provided above the heat exchange sleeve (10). A condenser (14) is provided at the output end of the compressor (11). A liquid storage tank (16) is provided at the output end of the condenser (14).

2. The refrigeration equipment for cold storage with convenient automatic defrosting according to claim 1, characterized in that, The heat exchange sleeve (10) is a hollow annular structure, and its inner circumference is located in the upper part of the outer circumference of the compressor (11). The inner circumference of the heat exchange sleeve (10) is provided with heat exchange grooves (17). The top of the heat exchange sleeve (10) is provided with multiple heat exchange medium interfaces. One of the heat exchange medium interfaces is connected to the input end of the heat pump (9) through a pipeline. The output end of the heat pump (9) is provided with an expansion valve (3).

3. The refrigeration equipment for cold storage with convenient automatic defrosting according to claim 1, characterized in that, The defrosting assembly (24) includes a defrosting tube (29), an upper heating tube (28), and a lower heating tube (30). The upper heating tube (28) and the lower heating tube (30) are both S-shaped structures. The upper heating tube (28) is located above the evaporator (25), and the lower heating tube (30) is located below the defrosting tube (29). The defrosting tube (29) is arranged close to the lower surface of the evaporator (25). The input end of the defrosting tube (29) is connected to the output end of the expansion valve (3) through a pipeline. The upper heating tube (28), the lower heating tube (30), and the upper part of the defrosting tube (29) are all fixedly connected to the outer frame (19) through connectors.

4. The refrigeration equipment for cold storage with convenient automatic defrosting according to claim 3, characterized in that, The connector includes a fixed crossbeam (38), the two sides of which are fixedly connected to the inner sidewall of the outer frame (19). The bottom of the fixed crossbeam (38) is provided with multiple fixing plates (37), all of which are semi-circular structures.

5. The refrigeration equipment for cold storage with convenient automatic defrosting according to claim 1, characterized in that, The water receiving tray (26) has a wedge-shaped structure with its bottom surface tilted unidirectionally along its length. The top of the water receiving tray (26) is integrally formed with a baffle (35). Multiple water level sensors (32) are embedded in the outer wall of the baffle (35). The top outer side of the water receiving tray (26) is integrally formed with a connecting edge (36). The bottom of the water receiving tray (26) is provided with an anti-clogging electric heating tube (33). The bottom of the water receiving tray (26) is welded with a drain pipe (27). The outlet end of the drain pipe (27) extends to the outside through the outer frame (19). Multiple anti-cold bridge lugs (18) are provided on the outer wall of the outer frame (19). The anti-cold bridge lugs (18) include a lifting ring (39). The outer circumferential wall of the lifting ring (39) is fitted with an outer sleeve (40).

6. The refrigeration equipment for cold storage with convenient automatic defrosting according to claim 1, characterized in that, The defrosting assembly includes a vibration plate (41), the upper surface of which is fixedly connected to the lower surface of the evaporator (25), and a plurality of transducers (42) are provided at the bottom of the vibration plate (41).

7. The refrigeration equipment for cold storage with convenient automatic defrosting according to claim 1, characterized in that, The upper and lower ends of the outer frame (19) are respectively provided with multiple air inlets and multiple air outlets. The top of the air inlet is provided with a circular dustproof net, and the inner circumference of the air outlet is provided with an axial flow fan (23). The inner side wall of the outer frame (19) is provided with multiple support arms (31). The upper surface of the multiple support arms (31) is supported on the lower surface edge of the evaporator (25). The inner side wall of the outer frame (19) is integrally formed with multiple mounting edges (34). The upper surface of the mounting edge (34) is fixedly connected to the lower surface of the connecting edge (36).

8. The refrigeration equipment for cold storage with convenient automatic defrosting according to claim 1, characterized in that, The outer frame (19) is provided with junction box two (20), junction box three (21) and junction box four (22) on its side. Junction box two (20) is electrically connected to the axial flow fan (23), junction box three (21) is electrically connected to the upper heating tube (28) and the lower heating tube (30), and junction box four (22) is electrically connected to the anti-blocking heating tube (33).

9. The refrigeration equipment for cold storage with convenient automatic defrosting according to claim 1, characterized in that, The output end of the storage tank (16) is equipped with a drying filter (7), and the output end of the drying filter (7) is equipped with an expansion valve (6). The output end of the expansion valve (6) is connected to the input end of the evaporator (25) through a pipeline.

10. The refrigeration equipment for cold storage with convenient automatic defrosting according to claim 1, characterized in that, Square dustproof nets are provided on both the front and rear sides of the outdoor unit (2). Multiple cooling fans (15) are provided on the inner wall of the outdoor unit (2). The multiple cooling fans (15) are located on the air outlet side of the condenser (14). Multiple suspension arms (13) are provided on both sides of the condenser (14). The top of the multiple suspension arms (13) is fixedly connected to the top of the inner cavity of the outdoor unit (2). The rear wall of the outdoor unit (2) is provided with a first clearance hole (4) for the refrigeration pipe to pass through and a second clearance hole (5) for the waste heat recovery pipe to pass through. A damping pad (12) is provided between the bottom of the inner cavity of the outdoor unit (2) and the bottom of the compressor (11). A junction box (8) is provided on the rear side of the outdoor unit (2). The junction box (8) is electrically connected to the compressor (11), the heat pump (9) and the multiple cooling fans (15).

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