A defrosting system and a small refrigerated display cabinet having the same

Abstract

The utility model discloses a defrosting system and small -size refrigeration show cabinet with defrosting system, defrosting system includes evaporimeter, refrigeration circuit, defrosting control circuit and defrosting timer that defrosting control circuit is connected in parallel with refrigeration circuit, and the defrosting system includes compressor, condensing fan and temperature controller, and the compressor is connected in parallel with condensing fan, and is connected in series with temperature controller, defrosting control circuit includes series connection's defrosting electric heater, metal overheating protector, and the defrosting electric heater, evaporimeter pipe of evaporimeter is arranged in the defrosting cavity between the cabinet body inner shell and insulating layer of show cabinet, defrosting timer includes first contact, second contact and third contact, and the first contact is connected with fire line, and the second contact is connected with temperature controller, and the third contact is connected with zero line after series connection of metal overheating protector and defrosting electric heater, the utility model discloses beneficial effect is: suitable for small -size refrigeration show cabinet automatic defrosting, and heat exchange efficiency is high, and it is convenient to save time, and it is labor -saving cost.

Description

Technical Field

[0001] This application belongs to the field of home appliance technology, specifically relating to a defrosting system and a small refrigerated display case having the defrosting system. Background Technology

[0002] With the development of technology and the continuous improvement of living standards, more and more refrigeration equipment (such as refrigerators, air conditioners, and refrigerated display cases) are widely used in daily life. Existing refrigerated display cases are divided into medium-to-large and small types. Medium-to-large refrigerated display cases are mostly used in large and medium-sized supermarkets, department stores, and shopping malls. Due to their large space, these display cases have the capability for manual defrosting. Small refrigerated display cases, on the other hand, are mostly used in small food chain stores and retail stalls. Due to their limited space, they cannot be manually defrosted. For example, Chinese Patent 202320043980.8 discloses a defrosting glass display case that melts the frost on the surface of the display case without affecting the transparent display effect of the square transparent case. This design has the advantages of uniform and convenient defrosting compared to the existing method of manually defrosting with a cloth. However, it cannot defrost the inner walls of the refrigerated display case, which has certain limitations. Furthermore, the defrosting pipe in this application is located on the side of the square transparent display case, which may cause some energy loss and affect the defrosting effect.

[0003] Therefore, there is an urgent need for a defrosting system that requires no manual defrosting, has high defrosting efficiency, and is suitable for defrosting small refrigerated display cases. Utility Model Content

[0004] In view of the shortcomings of the prior art described above, the purpose of this application is to provide a defrosting system and a small refrigerated display case with the defrosting system, so as to solve the problems of small refrigerated display cases requiring manual defrosting, low energy utilization, and low defrosting efficiency.

[0005] To solve the above problems, the technical solution adopted in this application is:

[0006] The defrosting system of this utility model is characterized by comprising an evaporator, a refrigeration circuit, a defrosting control circuit connected in parallel with the refrigeration circuit, and a defrosting timer for switching between the refrigeration circuit and the defrosting control circuit. The refrigeration circuit includes a compressor, a condenser fan, and a temperature controller. The compressor is connected in parallel with the condenser fan and in series with the temperature controller. The defrosting control circuit includes a defrosting electric heater and a metal overheat protector connected in series. The defrosting electric heater and the evaporator tube of the evaporator are arranged in the defrosting cavity between the inner shell and the insulation layer of the display case. The defrosting timer includes a first contact, a second contact, and a third contact. The first contact is connected to the live wire, the second contact is connected to the temperature controller, and the third contact is connected in series with the metal overheat protector and the defrosting electric heater and then connected to the neutral wire.

[0007] As a preferred embodiment of this application, the defrosting electric heater is an electric heating wire, which is arranged on the inner shell of the cabinet along the length of the evaporator tube.

[0008] In some embodiments of this utility model, the evaporator tubes are arranged in a serpentine pattern inside the defrost chamber to absorb heat inside the defrost chamber and transfer the heat to the outside through the circulation of refrigerant.

[0009] As a preferred embodiment of this application, the electric heating wires are arranged in a serpentine pattern on the inner shell of the cabinet next to the evaporator tubes, and are used to heat the defrosting chamber of the display cabinet to defrost the inner wall of the display cabinet.

[0010] As a preferred embodiment of this application, at least half of the inner shell of the cabinet within the defrosting cavity is covered with an electric heating wire.

[0011] As a preferred embodiment of this application, the defrost timer further includes a defrost motor connected in parallel with the refrigeration circuit. One end of the defrost motor is electrically connected to the first contact, and the other end is connected to the neutral wire. This motor is used to control the operation of the first contact to achieve contact between the first contact and the second or third contact. When the first contact contacts the second contact and the temperature controller is in the off state, the refrigeration circuit is turned on; when the first contact contacts the third contact and the temperature controller is in the off state, the defrost control circuit is turned on.

[0012] This application also provides a small refrigerated display case, characterized in that it includes the aforementioned defrosting system.

[0013] The working principle of this utility model is as follows: After the display cabinet defrosts, the first and second contacts of the defrost timer are connected, and the defrost timer, compressor, and condenser fan run simultaneously. The defrost timer is connected in series with the defrost electric heater and the metal overheat protector. However, due to the large internal resistance of the defrost timer and the small internal resistance of the defrost electric heater, only a small portion of the voltage is applied to the defrost timer, resulting in very little heat generation. After the defrost timer and compressor have run for the set time, the first and third contacts are connected, disconnecting the power supply to the compressor and condenser fan, causing them to stop running. At the same time, the power supply to the defrost electric heater is connected, heating the defrost chamber. When the surface temperature of the evaporator reaches a certain value, the first and third contacts of the temperature controller automatically disconnect. After the defrost timer runs for about 2-5 minutes, the first and second contacts reconnect, completing one automatic defrosting process. The compressor and condenser fan resume normal operation. When the temperature controller reaches the set defrost temperature, it disconnects, and the first and second contacts of the defrost timer reconnect to begin the next defrosting cycle.

[0014] Compared with the prior art, the beneficial effects of this application are:

[0015] 1. This utility model can effectively solve the defect of small refrigerated display cabinets being prone to frost, prevent the heat exchange efficiency from decreasing and the cooling capacity from decreasing due to frost, and also save the trouble of manual defrosting, making it convenient, time-saving and labor-saving.

[0016] 2. Since the contact area between the heating wire and the inner wall determines the degree of defrosting, the heating wire can be arranged according to the capacity of the display case. At least 1 / 2 of the inner shell of the cabinet in the defrosting chamber should be covered with the heating wire, which can effectively defrost the inner wall of the cabinet and improve defrosting efficiency.

[0017] 3. This utility model uses electronic circuits to achieve timing control. The refrigeration system and heating wire are controlled separately through a defrosting timer, eliminating the noise of mechanical operation and reducing power consumption.

[0018] 4. This utility model allows for arbitrary setting of the defrost timer, compressor cumulative working time, and defrost recovery time, making it more convenient, user-friendly, and highly versatile.

[0019] 5. The electronic circuit of this utility model does not have wear and tear problems, has a low failure rate, and a longer service life. Attached Figure Description

[0020] Figure 1 This is a structural diagram of the defrosting system of this application.

[0021] Figure 2 This is a schematic diagram of the defrosting control circuit of this application.

[0022] Figure 3 This is a schematic diagram illustrating the installation of the door and the cabinet of the display case in this application. Attached Figure Description

[0024] 1-Refrigeration circuit; 11-Compressor; 12-Condenser fan; 13-Temperature controller;

[0025] 2-Defrosting control circuit; 21-Defrosting electric heater; 22-Metal overheat protector;

[0026] 3-Defrosting timer; 31-First contact; 32-Second contact; 33-Third contact; 34-Defrosting motor;

[0027] 4-Evaporator tubes;

[0028] 5-Display cabinet; 51-Inner shell of cabinet; 52-Insulation layer; 53-Defrosting chamber; 54-Door; 55-Conductive component; 56-Connector; 57-Bolt; 58-Nut; 59-Wire; 551-Bolt; 552-Nut. Detailed Implementation

[0029] The following specific examples illustrate the implementation of this application. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification. This application can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this application.

[0030] It should be noted that the process equipment or apparatus not specifically mentioned in the following embodiments are all conventional equipment or apparatus in the art.

[0031] Furthermore, it should be understood that the existence of other method steps before or after the combined steps, or the insertion of other method steps between these explicitly mentioned steps, does not preclude the existence of other method steps before or after the combined steps, or the insertion of other method steps between these explicitly mentioned steps, unless otherwise stated. It should also be understood that the combined connection relationship between one or more devices / apparatus mentioned in this application does not preclude the existence of other devices / apparatus before or after the combined devices / apparatus, or the insertion of other devices / apparatus between these explicitly mentioned devices / apparatus, unless otherwise stated. Moreover, unless otherwise stated, the numbering of each method step is merely a convenient tool for identifying each method step, and not for limiting the order of the method steps or limiting the scope of implementation of this application. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of implementation of this application.

[0032] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0033] In the description of this application, it should be understood that the terms "upper," "lower," "left," "right," "inner," "outer," "axial," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are used only for the convenience of describing this application and simplifying the description, and do not 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 this application. Furthermore, features defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0034] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0035] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0036] The present application will be further described below with reference to specific embodiments, but the scope of protection of the present application is not limited thereto.

[0037] The defrosting system of this utility model includes an evaporator, a refrigeration circuit 1, a defrosting control circuit 2 connected in parallel with the refrigeration circuit 1, and a defrosting timer 3 for switching between the refrigeration circuit 1 and the defrosting control circuit 2. The refrigeration circuit 1 includes a compressor 11, a condenser fan 12, and a temperature controller 13. The compressor 11 is connected in parallel with the condenser fan 12 and connected in series with the temperature controller 13. The defrosting control circuit 2 includes a defrosting electric heater 21 and a metal overheat protector 22 connected in series. The defrosting electric heater 21 and the evaporator tube 4 of the evaporator are arranged in the defrosting cavity 53 between the inner shell 51 and the insulation layer 52 of the display case 5. The defrosting timer 3 includes a first contact 31, a second contact 32, and a third contact 33. The first contact 31 is connected to the live wire L, the second contact 32 is connected to the temperature controller 13, and the third contact 33 is connected in series with the metal overheat protector 22 and the defrosting electric heater 21 and then connected to the neutral wire N.

[0038] In some embodiments of this utility model, the defrosting electric heater 21 is an electric heating wire, which is arranged in the defrosting chamber 53 along the length of the evaporator tube 5.

[0039] In some embodiments of this utility model, the evaporator tubes 5 are arranged in a serpentine pattern within the defrosting chamber.

[0040] In some embodiments of this utility model, the electric heating wire is arranged in a serpentine pattern within the defrosting cavity 53.

[0041] In some embodiments of this utility model, at least half of the inner shell of the cabinet within the defrosting cavity 53 is covered with an electric heating wire.

[0042] In some embodiments of this utility model, the defrost timer 3 further includes a defrost motor 34 connected in parallel with the refrigeration circuit 1. One end of the defrost motor 34 is electrically connected to the first contact 31, and the other end is connected to the neutral wire. It is used to control the operation of the first contact 31 so that the first contact 31 contacts the second contact 32 or the third contact 33. When the first contact 31 contacts the second contact 32 and the temperature controller 13 is in the off state, the refrigeration circuit 1 is turned on; when the first contact 31 contacts the third contact 33 and the temperature controller 13 is in the off state, the defrost control circuit 2 is turned on.

[0043] In some embodiments of this utility model, electrically insulating connectors are installed on the cabinet body of the display cabinet, the door 54 is hinged to the connector 56 through a conductive member 55, and an indicator light is provided inside the door 54. The indicator light is electrically connected to one end of a wire 59 through the conductive member 55 to prevent the wire from being exposed.

[0044] In some embodiments of this utility model, the conductive component 55 is a conductive metal hinge, having a first piece and a second piece hinged together. The door is fixed to the first piece of the metal hinge by bolts 551 and nuts 552 that are screwed together. The connecting component is fixed to the second piece of the metal hinge by bolts and nuts that are screwed together. One end of the wire is electrically connected to the defrosting system of the display cabinet, and the other end is fixed to the second piece. The indicator light is electrically connected to the wire through the electrically conductive bolts, nuts, and the metal hinge. This structure connects the door and the cabinet, solving the problem of exposed wires. The metal hinge, in conjunction with the bolts and nuts, provides both fixation and conductivity, allowing the wire to be electrically connected to the indicator light without being exposed.

[0045] This utility model also provides a small display cabinet, including the aforementioned defrosting system.

[0046] The working process of this utility model is as follows: After the display cabinet defrosts, the first contact 31 and the second contact 32 of the defrost timer 3 are connected, and the defrost timer 3, compressor 11, and condenser fan 12 operate simultaneously. The defrost timer 4 is connected in series with the defrost electric heater 21 and the metal overheat protector 22. However, due to the large internal resistance of the defrost timer 3 and the small internal resistance of the defrost electric heater 21, most of the voltage is applied to the defrost timer 3, and the defrost timer 3 generates very little heat. After the defrost timer 3 and compressor 11 have run for the set time, the first contact 31 and the third contact 33 are connected, the power supply to compressor 11 and condenser fan 12 is disconnected, and compressor 11 and condenser fan 12 stop operating. When the power supply to the defrosting electric heater 21 is turned on, the defrosting chamber 53 is heated. When the surface temperature of the evaporator reaches a certain value, the first contact 31 and the third contact 33 of the defrosting timer 3 automatically disconnect. After the defrosting timer 3 runs for about 2 to 5 minutes, the first contact 31 and the second contact 32 reconnect, completing one automatic defrosting process. The compressor 11 and the condenser fan 12 resume normal operation. When the temperature controller 13 reaches the set defrosting temperature, the temperature controller 13 disconnects, and the first contact 31 and the second contact 32 of the defrosting timer 3 reconnect, and the next defrosting cycle begins.

[0047] This application effectively solves the problem of easy frost buildup in small refrigerated display cases, preventing reduced heat exchange efficiency and decreased cooling capacity caused by frost. It also eliminates the hassle of manual defrosting, making it convenient, time-saving, and saving labor costs. Since the contact area between the heating wire and the inner wall determines the degree of defrosting, the heating wire can be arranged according to the capacity of the display case. At least 1 / 2 of the inner shell of the cabinet in the defrosting chamber is covered by the heating wire, which can effectively defrost the inner wall of the cabinet and improve defrosting efficiency. This utility model uses electronic circuits to achieve timer control, eliminating the noise of mechanical operation and having low power consumption. This utility model allows for arbitrary setting of the defrosting timer, the compressor's cumulative working time, and the defrosting recovery time, making it more convenient, user-friendly, and highly versatile. 5. The electronic circuits of this utility model do not have wear problems, have a low failure rate, and a longer service life.

[0048] The above embodiments are for illustrating the implementation schemes disclosed in this application and should not be construed as limiting this application. Furthermore, various modifications listed herein, as well as variations in methods and compositions of the utility model, will be apparent to those skilled in the art without departing from the scope and spirit of this application. Although this application has been specifically described in conjunction with various specific preferred embodiments, it should be understood that this application should not be limited to these specific embodiments. In fact, various modifications as described above that are obvious to those skilled in the art to obtain the utility model should be included within the scope of this application.

Claims

1. A defrosting system, characterized in that: The system includes an evaporator, a refrigeration circuit (1), a defrosting control circuit (2) connected in parallel with the refrigeration circuit (1), and a defrosting timer (3) for switching between the refrigeration circuit (1) and the defrosting control circuit (2). The refrigeration circuit (1) includes a compressor (11), a condenser fan (12), and a temperature controller (13). The compressor (11) is connected in parallel with the condenser fan (12) and in series with the temperature controller (13). The defrosting control circuit (2) includes a defrosting electric heater (21) and a metal overheat protector connected in series. 22), the defrosting electric heater (21) and the evaporator tube (4) of the evaporator are arranged in the defrosting cavity (53) between the inner shell (51) and the insulation layer (52) of the display cabinet (5); the defrosting timer (3) includes a first contact (31), a second contact (32) and a third contact (33). The first contact (31) is connected to the live wire, the second contact (32) is connected to the temperature controller (13), and the third contact (33) is connected to the neutral wire after being connected in series with the metal overheat protector (22) and the defrosting electric heater (21).

2. The defrosting system according to claim 1, characterized in that: The defrosting electric heater (21) is an electric heating wire, which is arranged in the defrosting chamber (53) along the length of the evaporator tube (4).

3. The defrosting system according to claim 1, characterized in that: The evaporator tubes (4) are arranged in a serpentine pattern inside the defrosting chamber (53) to absorb the heat inside the defrosting chamber and transfer the heat to the outside through the circulation of refrigerant.

4. The defrosting system according to claim 2, characterized in that: The electric heating wires are arranged in a serpentine pattern inside the defrosting chamber (53) to heat the defrosting chamber of the display cabinet (5) to defrost the inner wall of the display cabinet (5).

5. The defrosting system according to claim 1, characterized in that: At least half of the inner shell (51) of the cabinet inside the defrosting chamber (53) is covered with an electric heating wire.

6. The defrosting system according to claim 1, characterized in that: The defrosting timer (3) also includes a defrosting motor (34) connected in parallel with the refrigeration circuit (1). One end of the defrosting motor (34) is electrically connected to the first contact (31), and the other end is connected to the neutral wire. It is used to control the action of the first contact (31) to make the first contact (31) contact the second contact (32) or the third contact (33). When the first contact (31) contacts the second contact (32) and the temperature controller (13) is in the off state, the refrigeration circuit (1) is turned on. When the first contact (31) contacts the third contact (33) and the temperature controller (13) is in the off state, the defrosting control circuit (2) is turned on.

7. A small refrigerated display case (5), characterized in that, The defrosting system includes any one of claims 1 to 6.

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