A top-mounted refrigeration unit and kitchen refrigerator

Abstract

The application provides a top-mounted refrigerating unit and a kitchen refrigerator, which comprises a condenser, a compressor, a heat preservation chamber, an evaporator, a liquid accumulator, a capillary tube and a water pan. The evaporator is arranged in the heat preservation chamber, the evaporator outlet is provided with the liquid accumulator, the capillary tube is used for being connected with the condenser outlet, the water pan is arranged at the bottom of the evaporator and is used for storing defrosting water of the evaporator, a first auxiliary heater is arranged below the water pan, the first auxiliary heater is laid on the outer wall surface of the bottom of the water pan, the water of the water pan is discharged out of the box through a drain pipe, a second auxiliary heater is arranged around the drain pipe and is used for preventing ice blockage. The refrigerating unit of the kitchen refrigerator is all top-mounted in the application, the pipeline connection is convenient, the volume is smaller, the occupied installation space is smaller, the defrosting and drainage structure is reasonably designed, the auxiliary heater is arranged around the water pan and the drain pipe, the risk of water overflow of the water pan or local icing of the evaporator heat preservation chamber is avoided, and the operation reliability of the box is improved.

Description

Technical Field

[0001] This application relates to the field of household appliance technology, and more specifically to a top-mounted refrigeration unit and a kitchen refrigerator. Background Technology

[0002] As modern families increasingly pursue a higher quality of life, the kitchen refrigerator, as an indispensable appliance in daily life, has seen its design optimization and performance improvement become important directions for technological research and development. Refrigerators not only bear the important tasks of food preservation and freezing, but their internal space layout and operational efficiency also directly affect the user experience. In refrigerator design, the compressor, heat dissipation module, and evaporator, as the core components of the refrigerator's refrigeration system, have their location, working principle, and related auxiliary equipment design directly affecting key performance indicators such as refrigeration efficiency, energy consumption, and space utilization.

[0003] In existing refrigerator designs, to maintain the stability and efficiency of the refrigeration system, the compressor and heat dissipation module are typically placed in the lower part of the refrigerator. This effectively dissipates heat while avoiding excessive space occupation within the refrigerator's interior. The evaporator, on the other hand, is located inside the refrigerator compartment, with a large fan shroud and a long air duct in front of it. This design transfers the cold energy from the refrigerant to the air inside the refrigerator through the evaporator, and then the air duct evenly distributes the cold air into the refrigerator or freezer compartment, thus achieving the cooling effect. Simultaneously, to handle the condensate generated during the refrigeration process, some top-mounted refrigeration units on the market have a drip tray outside the evaporator chamber. Heating coils are used to heat and evaporate the water in the drip tray, preventing condensate buildup.

[0004] However, traditional refrigerator refrigeration units mostly use evaporators placed inside the refrigerator or freezer compartment, which to some extent occupies the space of the refrigerator or freezer compartment, resulting in low refrigerator volume utilization. Utility Model Content

[0005] To address the issue that traditional refrigerator refrigeration units mostly use evaporators placed inside the refrigerator or freezer compartments, which to some extent occupies space in the refrigerator or freezer compartments and results in low refrigerator volume utilization.

[0006] This application provides a top-mounted refrigeration unit, including: an insulated chamber;

[0007] The heat-insulating chamber is equipped with a condenser and a compressor, and the condenser is connected to the compressor outlet through a pipe;

[0008] The insulated chamber is equipped with an evaporator, a liquid reservoir, and a capillary tube.

[0009] The evaporator is horizontally installed at the bottom of the heat preservation chamber, the evaporator outlet is connected with the liquid reservoir through a copper pipe, the liquid reservoir is in communication with the capillary inlet, and the capillary outlet extends to the evaporator inlet.

[0010] A water collecting tray is arranged below the evaporator, and the water collecting tray is a rectangular groove.

[0011] In a feasible implementation, the surface area of the water collecting tray is greater than the bottom area of the evaporator, the depth of the water collecting tray is 3-5 cm, and the horizontal inclination angle is 3-5°.

[0012] In a feasible implementation, a first auxiliary heater is arranged on the outer wall surface of the bottom of the water collecting tray.

[0013] In a feasible implementation, the first auxiliary heater is an electric heating film or a resistance wire, and is uniformly attached to the outer wall surface of the bottom of the water collecting tray.

[0014] In a feasible implementation, a drain pipe is arranged on one side of the water collecting tray, the drain pipe extends downward from the bottom of the water collecting tray to the outside of the refrigerator.

[0015] A second auxiliary heater is spirally wound on the outer wall of the drain pipe.

[0016] In a feasible implementation, the heating temperature range of the second auxiliary heater is 20-50℃.

[0017] In a feasible implementation, the condenser fan is fixed at the front end of the condenser, and the air outlet of the condenser fan faces the outside of the refrigerator.

[0018] In a feasible implementation, a compressor frequency converter is arranged beside the side of the heat preservation chamber away from the condenser.

[0019] The compressor frequency converter is electrically connected with the compressor, a heat dissipation fan is arranged above the compressor frequency converter, and the air outlet of the heat dissipation fan is in communication with the outside of the refrigerator.

[0020] In a feasible implementation, an evaporation fan is further arranged in the heat preservation chamber.

[0021] The evaporation fan is arranged close to one side of the evaporator, and the air outlet of the evaporation fan faces the evaporator.

[0022] Another aspect of the application provides a kitchen refrigerator, and the top of the kitchen refrigerator is integrated with the top-mounted refrigeration unit according to any one of the above.

[0023] From the above, the application provides a top-mounted refrigeration unit and a kitchen refrigerator, which installs the evaporator horizontally at the bottom of the heat preservation chamber and configures a water receiving tray, effectively avoiding the occupation of the large-area air hood and the long air supply duct in front of the evaporator to the internal space of the refrigerator, improving the utilization rate of the volume of the refrigerator. The first auxiliary heater arranged on the outer wall surface at the bottom of the water receiving tray can accelerate the evaporation of water, prevent water overflow, and keep the refrigerator clean. The second auxiliary heater spirally wound on the outer wall of the drain pipe further prevents icing outside the evaporator chamber, maintains the refrigeration efficiency of the refrigerator, and reduces the maintenance cost and use risk. At the same time, the design of the condensing fan and the heat dissipation fan helps to discharge the hot air generated in the condensing process, reduces the difference between the internal and external negative pressures, and solves the problem of laborious opening of the door. The defrosting and drainage structure is designed, auxiliary heaters are arranged around the water receiving tray and the drain pipe, the risk of water overflow of the water receiving tray or local icing of the evaporator heat preservation chamber is avoided, and the operation reliability of the cabinet is improved. BRIEF DESCRIPTION OF DRAWINGS

[0024] The drawings incorporated into the specification and constituting a part of the specification show embodiments consistent with the present application and, together with the specification, serve to explain the principles of the embodiments of the present application. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained from these drawings without creative labor for those skilled in the art.

[0025] Figure 1 is a structural schematic diagram of the top-mounted refrigeration unit shown in the embodiments of the present application;

[0026] Figure 2 is Figure 1 a side view.

[0027] BRIEF DESCRIPTION OF DRAWINGS

[0028] 1-condenser; 2-condensing fan; 3-compressor; 4-heat preservation chamber; 5-evaporator; 6-evaporating fan; 7-liquid accumulator; 8-compressor frequency converter; 9-heat dissipation fan; 10-capillary tube; 11-water receiving tray; 12-first auxiliary heater; 13-drain pipe; 14-second auxiliary heater. DETAILED DESCRIPTION

[0029] Example implementations will now be described more fully with reference to the accompanying drawings. Example implementations, however, can be implemented in many different forms and should not be considered limited to the examples set forth in this disclosure; rather, these example implementations are provided so that this disclosure will be thorough and complete, and will fully convey the scope of example implementations to those skilled in the art. The described features, structures, or characteristics can be combined in any suitable manner in one or more implementations. In the following description, numerous specific details are provided to give a thorough understanding of implementations of the subject matter. However, implementations can be practiced without the specific details.

[0030] From the above, it is known that the embodiments of the present application need to explain that the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that the structure, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or includes elements inherent to such structure, article or device. Without more limitations, the element defined by the statement "including" does not exclude the presence of other identical elements in the structure, article or device including the element.

[0031] In the existing refrigerator design technology, in order to maintain the stability and efficiency of the refrigeration system, the compressor and the heat dissipation module are usually designed to be placed in the lower space of the refrigerator, which can effectively dissipate heat and avoid occupying too much space inside the refrigerator. The evaporator is located inside the refrigerator compartment, and a large-area wind cover and a long air supply duct are arranged in front of the evaporator. This design transmits the cold energy in the refrigerant to the air inside the refrigerator through the evaporator, and then uniformly sends the cold air into the refrigeration chamber or the freezing chamber through the air supply duct, so as to realize the refrigeration effect. However, at the same time, it occupies the space of the freezing chamber or the refrigeration chamber of the refrigerator to some extent, resulting in low volume utilization rate of the refrigerator.

[0032] To solve the above problems, the first aspect of the embodiments of the present application provides a top-mounted refrigeration unit, referring to FIG. 1, which comprises: Figures 1-2 The heat preservation chamber 4 is the main structure of the entire refrigeration unit, and plays a role of heat insulation and heat preservation. It ensures the efficient and stable refrigeration effect, and reduces the interference of the external environment on the refrigeration cycle.

[0033] The condenser 1 is located outside the heat preservation chamber 4 and is connected to the outlet of the compressor 3 through a pipeline. The main function of the condenser 1 is to cool the high-temperature and high-pressure gas discharged by the compressor 3 into high-pressure liquid, providing necessary refrigerant state for the subsequent refrigeration cycle. The compressor 3 is also located outside the heat preservation chamber 4 and is the power source of the refrigeration cycle. The compressor 3 compresses the refrigerant gas to increase its temperature and pressure, and provides high-temperature and high-pressure refrigerant gas for the condenser 1.

[0034] The heat preservation chamber 4 is internally provided with an evaporator 5, a liquid accumulator 7 and a capillary tube 10; the evaporator 5 transmits the cold energy in the refrigerant to the air inside the refrigerator through heat exchange, so as to realize the refrigeration effect. This design reduces the occupation of the air supply duct to the internal space of the refrigerator, and improves the volume utilization rate of the refrigerator. The liquid accumulator 7 is connected with the outlet of the evaporator 5 through a copper pipe, and the main function of the liquid accumulator 7 is to store the refrigerant liquid flowing out of the evaporator 5. The capillary tube 10 is a throttling device, and the capillary tube 10 is connected with the inlet of the evaporator 5. The capillary tube 10 reduces the cross section of the refrigerant flow channel, reduces the pressure and temperature of the refrigerant, and provides the evaporator 5 with an appropriate amount of low-temperature and low-pressure refrigerant.

[0035] The water pan 11 is also provided below the evaporator 5, and the water pan 11 is a rectangular groove body. The main function of the water pan 11 is to collect the condensed water generated in the refrigeration process, so as to avoid the accumulation of condensed water in the refrigerator, and to maintain the cleanliness and hygiene of the refrigerator.

[0036] The top-mounted refrigeration unit design of the embodiments of the present application effectively solves the problem of occupying storage space in the traditional refrigerator design. The evaporator 5 is horizontally installed at the bottom of the heat preservation chamber 4, which reduces the occupation of the air supply duct to the internal space of the refrigerator, and improves the volume utilization rate of the refrigerator. At the same time, the design of the water pan 11 avoids the accumulation of condensed water, and maintains the cleanliness and hygiene of the refrigerator. In addition, the present scheme also optimizes the layout of the refrigeration system, improves the refrigeration efficiency, reduces the noise and energy consumption, and is convenient for maintenance and repair.

[0037] In some embodiments of the present application, the surface area of the water pan 11 is greater than the bottom area of the evaporator 5, the depth of the water pan 11 is 3-5 cm, and the horizontal inclination angle is 3-5°. In the present embodiment, the surface area of the water pan 11 is greater than the bottom area of the evaporator 5, which can ensure that all the condensed water dripping from the evaporator 5 can be collected by the water pan 11, so as to avoid water overflow.

[0038] Specifically, the depth is set to 3-5 cm, which can provide sufficient volume to store condensed water, and at the same time ensure that the water pan will not be too bulky or occupy too much space. For example, if the depth is set to 3 cm, for small or medium-sized refrigerators, a depth of 3 cm is usually sufficient to collect the condensed water generated in the daily refrigeration process. This design will not occupy too much space, and can ensure that the condensed water will not overflow. For large refrigerators or occasions requiring long-term refrigeration, a depth of 5 cm can provide more storage space, so as to ensure that the condensed water can be effectively collected when a large amount of condensed water is generated. This helps to maintain the cleanliness and hygiene of the interior of the refrigerator.

[0039] The horizontal inclination angle is 3°-5°, which helps the condensed water to flow smoothly to the lowest point of the water pan 11, facilitating subsequent drainage treatment. The appropriate inclination angle can ensure that the condensed water does not accumulate or stagnate in the water pan 11. For example, a 3° inclination angle is sufficient to ensure that the condensed water flows smoothly to the drain of the water pan 11 for most household refrigerators. This design is simple and effective, reducing the complexity of the drainage system. In some special cases, such as faster drainage or larger amount of condensed water, a 5° inclination angle can provide stronger drainage capacity. This helps to ensure that the condensed water can be quickly drained after being generated, avoiding contamination of the interior of the refrigerator.

[0040] The embodiments of the present application can ensure that the condensed water is effectively collected. By reasonably setting the depth and inclination angle of the water pan 11, it can be ensured that all the condensed water dripping from the evaporator 5 can be effectively collected, avoiding water overflow or accumulation in the refrigerator. The depth of the water pan 11 is designed considering the overall space and aesthetics of the refrigerator, avoiding being too bulky or occupying too much space. At the same time, the appropriate inclination angle can also ensure that the condensed water flows smoothly to the drain, reducing the complexity of the drainage system.

[0041] In some embodiments of the present application, the first auxiliary heater 12 is arranged on the bottom outer wall surface of the water pan 11.

[0042] In existing refrigeration units, the position where the evaporator 5 chamber outside contacts the base is prone to icing, which not only reduces the refrigeration efficiency of the refrigerator, but also threatens the operation reliability of the refrigerator, increasing the user's maintenance cost and use risk. The first auxiliary heater 12, when the refrigerator is stopped or in a low-temperature environment, heats the condensed water in the water pan 11 to prevent it from icing or freezing, ensuring that the condensed water can be smoothly drained. At the same time, heating can also accelerate the evaporation of the condensed water, further maintaining the dryness of the interior of the refrigerator, and also avoiding the problem of icing at the position where the evaporator 5 chamber outside contacts the base.

[0043] The embodiments of the present application prevent the condensed water from icing and accelerate evaporation through the first auxiliary heater 12, reducing the additional energy consumed by the refrigerator to handle the iced condensed water, improving the overall operation efficiency, and reducing the risk of damage to internal components of the refrigerator caused by iced condensed water, prolonging the service life of the refrigerator.

[0044] In some embodiments of the present application, the first auxiliary heater 12 is an electric heating film or a resistance wire, and is uniformly attached to the bottom outer wall surface of the water pan 11.

[0045] The electric heating film or the electric resistance wire has good thermal conductivity and high temperature resistance. The electric heating film or the electric resistance wire is uniformly attached to the outer wall surface of the bottom of the water receiving tray 11, so that heat can be uniformly transmitted to the water receiving tray 11 and the outside of the evaporator 5 chamber in contact with the water receiving tray 11. By heating the water receiving tray 11 and the surrounding area, the local temperature is increased, and the icing phenomenon at the position where the evaporator 5 chamber is in contact with the base is effectively prevented.

[0046] It can be understood that the first auxiliary heater 12 can be connected to the refrigerator control system through an electric wire and controlled by the control system to achieve on-demand heating.

[0047] The electric heating film can provide high heating density and make heat distribution more uniform, and is suitable for conditions requiring rapid heating and high temperature uniformity. Since the electric heating film is a planar heating element, heat can be uniformly distributed on the outer wall surface of the bottom of the water receiving tray 11, effectively preventing icing caused by local overheating or uneven temperature. The electric heating film usually has a thin thickness and a flexible installation method, which facilitates attachment and fixation on the outer wall surface of the bottom of the water receiving tray 11, and is also conducive to maintenance and replacement in the later stage.

[0048] The electric resistance wire heating method is relatively simple and has low cost. The electric resistance wire heating method is not limited by shape and size and can be flexibly applied to water receiving trays 11 of different shapes and sizes. If the cost budget for making the refrigerator is limited, the electric resistance wire heating method can be selected; if higher heating effect and temperature uniformity are pursued, the electric heating film can be selected. When selecting, the specific needs and conditions of the project can be considered comprehensively, and the present application does not make specific limitations.

[0049] In some embodiments of the present application, the water receiving tray 11 is provided with a drain pipe 13 extending obliquely downward from the bottom of the water receiving tray 11 to the outside of the refrigerator; and the second auxiliary heater 14 is spirally wound on the outer wall of the drain pipe 13.

[0050] Specifically, the inclined drain pipe 13 design ensures that the condensed water can be smoothly discharged to the outside of the refrigerator, reduces the accumulation of condensed water in the refrigerator, and keeps the inside of the refrigerator dry. The second auxiliary heater 14 heats the outer wall of the drain pipe 13, effectively preventing the condensed water from freezing and blocking in the drain pipe 13, and ensuring that the drainage system is unobstructed.

[0051] The present embodiment effectively solves the problems of condensed water discharge and freezing prevention, reduces the refrigerator failures caused by poor drainage or freezing and blocking, and improves the operation reliability and stability of the refrigerator. By preventing the drain pipe 13 from freezing and blocking, the number of maintenance times caused by drainage problems is reduced, and the maintenance cost of the user is reduced.

[0052] In some embodiments of the present application, the second auxiliary heater 14 heats the temperature range of 20℃-50℃. The setting of this temperature range aims to ensure that the temperature of the inside and surrounding environment of the drain pipe 13 remains above the freezing point, while avoiding excessive temperature causing adverse effects on the internal environment of the refrigerator. Specifically, 20℃ is the minimum safe temperature to ensure that the condensed water does not freeze, and 50℃ is the upper limit temperature to prevent thermal damage to other components of the refrigerator.

[0053] Specifically, when the ambient temperature is close to or below the freezing point, a heating temperature of 50℃ is sufficient to prevent the condensed water inside the drain pipe 13 from freezing, ensuring unobstructed drainage. Although higher temperatures can more effectively prevent freezing, excessive temperatures can accelerate the aging of the drain pipe 13, and even cause thermal damage to other sensitive components inside the refrigerator. Therefore, 50℃ is set as the upper limit of safety to ensure the long-term stable operation of the system. In cold winter areas, for example, the ambient temperature of the refrigerator may be below the freezing point. At this time, the second auxiliary heater 14 heats the drain pipe 13 to 50℃, which is sufficient to ensure that the condensed water does not freeze during discharge, thereby maintaining the unobstructed drainage of the drainage system.

[0054] In some embodiments of the present application, the condensing fan 2 is fixed at the front end of the condenser 1, and the air outlet of the condensing fan 2 faces the outside of the refrigerator. The condensing fan 2 is fixed at the front end of the condenser 1, ensuring that the airflow blown by the fan can directly act on the heat dissipation fins of the condenser 1.

[0055] The forced convection of the condensing fan 2 accelerates the airflow around the condenser 1, thereby enhancing the heat exchange efficiency and enabling the condenser to dissipate heat more quickly. By directing the air outlet of the condensing fan 2 towards the outside of the refrigerator, the heat generated during condensation is effectively discharged, avoiding internal circulation of heat, which helps to maintain a low-temperature environment inside the refrigerator. The optimized condensation system reduces energy consumption during condensation, improving the efficiency of the entire refrigeration cycle.

[0056] In some embodiments of the present application, the heat preservation chamber 4 is provided with a compressor frequency converter 8 on the side away from the condenser 1; the compressor frequency converter 8 is electrically connected with the compressor 3, and a heat dissipation fan 9 is arranged above the compressor frequency converter 8, with the air outlet of the heat dissipation fan 9 being in communication with the outside of the refrigerator.

[0057] Specifically, the compressor frequency converter 8 is arranged on the side of the heat preservation chamber 4 away from the condenser 1, in order to reduce the influence of heat generated by the condenser 1 on the working environment of the compressor frequency converter 8. The compressor frequency converter 8 is electrically connected with the compressor 3, realizing precise control of the rotation speed of the compressor. The heat dissipation fan 9 is arranged above the compressor frequency converter 8, with the air outlet of the heat dissipation fan 9 being in communication with the outside of the refrigerator, ensuring that the heat generated by the compressor frequency converter 8 can be discharged outside the refrigerator in a timely manner.

[0058] The compressor frequency converter 8 can accurately adjust the rotating speed of the compressor 3 according to the temperature demand inside the refrigerator and the external environmental conditions, realize the dynamic balance of the refrigerating capacity, and improve the energy efficiency. The heat dissipation fan 9 can timely discharge the heat generated by the compressor frequency converter 8 outside the refrigerator through forced convection, prevent the frequency converter from overheating, and ensure the stable operation thereof.

[0059] In some embodiments of the present application, the heat preservation chamber 4 is also provided with an evaporating fan 6; the evaporating fan 6 is close to one side of the evaporator 5, and the air outlet of the evaporating fan 6 faces the evaporator 5.

[0060] The heat preservation chamber 4 reduces the influence of external heat on the internal environment through the heat preservation material, and simultaneously provides sufficient space for accommodating other refrigeration components. As the heat absorbing component in the refrigeration cycle, the evaporator 5 absorbs the heat inside the refrigerator through the evaporation process of the liquid refrigerant, and realizes the refrigeration effect. In the present embodiment, the evaporating fan 6 is arranged to accelerate the air flow around the evaporator 5 through forced convection, improve the evaporation rate of the refrigerant and the temperature uniformity inside the refrigerator.

[0061] In another aspect of the present application, a kitchen refrigerator is provided, and the top of the kitchen refrigerator is integrated with the top-mounted refrigeration unit according to any one of the above.

[0062] As can be known from the above, the present application provides a top-mounted refrigeration unit and a kitchen refrigerator, which comprise: a condenser, a condensing fan, a compressor, a compressor frequency converter, a heat preservation chamber, an evaporator, an evaporating fan, a liquid reservoir, a heat dissipation fan, a capillary tube, a water collecting tray, an auxiliary heater, and a drain pipe; the compressor is connected through a pipeline, and is used in cooperation with the compressor frequency converter; the heat dissipation fan is used to dissipate the heat of the compressor frequency converter; the front end of the condenser is provided with the condensing fan, which is used to dissipate the heat of the compressor and the condenser; the condenser and the condensing fan are located behind the compressor; the evaporator is arranged in the heat preservation chamber; the outlet of the evaporator is provided with the liquid reservoir; the evaporating fan is located on one side of the evaporator, and is used to transfer the cold energy of the evaporator to the storage compartment; the capillary tube is used to be connected with the outlet of the condenser; the water collecting tray is located at the bottom of the evaporator, and is used to store the defrosting water of the evaporator; the auxiliary heater is arranged below the water collecting tray, and is laid on the outer wall surface at the bottom of the water collecting tray; the water in the water collecting tray is discharged outside the cabinet through the drain pipe; the auxiliary heater is arranged around the drain pipe, and is used to prevent ice blockage. The present application mounts all the refrigeration units of the refrigeration kitchen refrigerator on the top, which not only facilitates the pipeline connection, but also has a smaller volume and occupies a smaller installation space; meanwhile, through the design of the reasonable defrosting and drainage structure, the auxiliary heater is arranged around the water collecting tray and the drain pipe, so as to avoid the risk of water overflow of the water collecting tray or local icing of the evaporator heat preservation chamber, and improve the operation reliability of the cabinet.

[0063] Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure herein. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.

Claims

1. A rooftop chiller unit, characterized by, The utility model relates to a kind of top-mounted refrigeration unit, including: Heat preservation chamber (4); Condenser (1) and compressor (3) are equipped outside the heat preservation chamber (4), the condenser (1) is connected with the outlet of compressor (3) by pipeline; Evaporator (5), liquid reservoir (7) and capillary (10) are equipped inside the heat preservation chamber (4); The evaporator (5) is horizontally installed at the bottom of the heat preservation chamber (4), the outlet of the evaporator (5) is connected with the liquid reservoir (7) by copper pipe, the liquid reservoir (7) is communicated with the inlet of the capillary (10), and the outlet of the capillary (10) extends to the inlet of the evaporator (5); Water pan (11) is equipped below the evaporator (5), and the water pan (11) is rectangular groove body.

2. A rooftop chiller unit as set forth in claim 1, characterized by The surface area of the water pan (11) is greater than the area of the bottom of the evaporator (5), the depth of the water pan (11) is 3-5cm, and the horizontal inclination angle is 3-5°.

3. A rooftop chiller unit as set forth in claim 1, characterized by First auxiliary heater (12) is arranged on the outer wall surface of the bottom of the water pan (11).

4. A rooftop chiller unit as set forth in claim 3, characterized by The first auxiliary heater (12) is electric heating film or resistance wire, and is uniformly attached to the outer wall surface of the bottom of the water pan (11).

5. A rooftop chiller unit as set forth in claim 3, characterized by Drain pipe (13) is arranged on one side of the water pan (11), the drain pipe (13) extends downward from the bottom of the water pan (11) to the outside of the refrigerator, Second auxiliary heater (14) is spirally wound on the outer wall of the drain pipe (13).

6. A rooftop chiller unit as set forth in claim 5, characterized by The heating temperature range of the second auxiliary heater (14) is 20-50℃.

7. A rooftop chiller unit as set forth in claim 1, characterized by Condensing fan (2) is fixed at the front end of condenser (1), and the air outlet of condensing fan (2) faces the outside of the refrigerator.

8. A rooftop chiller unit as set forth in claim 1, characterized by Compressor frequency converter (8) is arranged on the side of the heat preservation chamber (4) away from the condenser (1); The compressor frequency converter (8) is electrically connected with the compressor (3), and heat dissipation fan (9) is arranged above the compressor frequency converter (8), and the air outlet of the heat dissipation fan (9) is communicated with the outside of the refrigerator.

9. A rooftop chiller unit as set forth in claim 1, characterized by Evaporative fan (6) is further arranged in the heat preservation chamber (4); The evaporative fan (6) is close to one side of the evaporator (5), and the air outlet of the evaporative fan (6) faces the evaporator (5).

10. A kitchen refrigerator, characterized by The top of the kitchen refrigerator is integrated with the top-mounted refrigeration unit according to any one of claims 1-9.

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