Air duct structure and selling cabinet

Abstract

The utility model discloses an air duct structure and a selling cabinet. An evaporator and a fan are arranged in a heat exchange chamber, an air outlet pipeline and an air return pipeline are connected with the heat exchange chamber, the air outlet pipeline passes through each temperature control chamber and is provided with an air outlet capable of being opened and closed corresponding to each temperature control chamber, and the air return pipeline passes through each temperature control chamber and is provided with an air outlet capable of being opened and closed corresponding to each temperature control chamber. Compared with an existing multi-temperature-zone selling cabinet product on the market, the air duct structure of the multi-temperature-zone selling cabinet has the advantages that temperature regulation and control of the multiple temperature zones of the selling cabinet can be completed only by matching the single heat exchange assembly with the air inlet pipeline and the air outlet pipeline.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of vending cabinet, in particular to a wind channel structure and vending cabinet. BACKGROUND

[0002] In recent years, with the vigorous development of global retail industry, especially the rapid expansion of commercial facilities such as domestic and foreign supermarkets and convenience stores, the market has put forward higher requirements for efficient and multifunctional commodity display and sales equipment. Among them, the multi-temperature zone vending cabinet as an advanced equipment that can meet the temperature storage requirements of different types of goods has increasing market demand. This kind of equipment can ensure the display and sale of food, beverages and other goods in the best state by accurately controlling the environmental conditions of each temperature zone, effectively improving the freshness and appeal of goods. Most of the multi-temperature zone vending cabinets on the current market adopt the traditional independent natural return air structure design, that is, each temperature zone is independently equipped with a set of evaporator and fan system. The basic working principle of this design is that the refrigerant flows into the evaporator of each temperature zone after compression and condensation, and the cold quantity is transferred to the temperature zone space through the natural circulation of the fan, so as to realize the purpose of cooling. Although this design meets the basic needs of multi-temperature zone control to some extent, its inherent limitations have become increasingly prominent:

[0003] Low space utilization efficiency: each temperature zone needs to be independently set with an evaporator and a fan system, which not only occupies a large amount of internal effective volume of the vending cabinet, but also limits the possibility of customers placing more goods in the limited space, affecting the sales efficiency and profitability.

[0004] High energy consumption: since each temperature zone needs a complete refrigeration cycle system, the working load of the compressor increases, and the whole machine energy consumption rises. In the current global background of advocating energy saving and emission reduction, high energy consumption has become an important factor restricting the market competitiveness of products.

[0005] High cost: the configuration of independent system requires more resources in manufacturing, installation and maintenance, directly leading to a substantial increase in product cost. This not only affects the market pricing strategy of the product, but also may lose the advantage in the fierce market competition due to high cost.

[0006] In summary, it is urgent to develop a new type of multi-temperature zone vending cabinet technology that can overcome the above-mentioned defects, realize efficient energy saving, space optimization and cost control, and become an urgent problem in the industry. INVENTION CONTENTS

[0007] The utility model discloses a kind of wind channel structure and vending cabinet to solve the technical problem that the existing technology partition temperature control vending cabinet needs to set multiple temperature control systems corresponding to temperature control zone.

[0008] The technical scheme adopted by the utility model is:

[0009] The utility model provides a kind of air duct structure, the air duct structure is used to connect multiple temperature control chambers and heat exchange chamber, heat exchange assembly is provided in the heat exchange chamber, it is characterized in that, the air duct structure includes:

[0010] Air outlet pipeline, one end of the air outlet pipeline is communicated with the air outlet side of the heat exchange chamber, the air outlet pipeline passes through each temperature control chamber, and the air outlet of each temperature control chamber is provided with switchable air outlet;

[0011] Air return pipeline, one end of the air return pipeline is communicated with the air return side of the heat exchange chamber, the air return pipeline passes through each temperature control chamber, and the air return of each temperature control chamber is provided with air return.

[0012] Further, compensation fan is further provided in the air return pipeline, and the air suction direction of the compensation fan is towards the air return direction of the air return pipeline.

[0013] Further, the air outlet is arranged in the upper half of temperature control chamber, and the air return is arranged in the lower half of temperature control chamber.

[0014] Further, water pan is provided below the heat exchange assembly in the heat exchange chamber.

[0015] Further, the heat exchange assembly includes evaporator and fan, and the air outlet direction of the fan is towards the connection place of the air outlet pipeline and the heat exchange chamber.

[0016] Further, the temperature control chamber is provided with three, and one air return and one air outlet are respectively provided in three temperature control chambers.

[0017] Further, each air outlet is provided with air valve, and each air return is provided with second air valve.

[0018] A vending cabinet includes heat exchange chamber provided with evaporator and fan, mechanical cavity provided with condenser and compressor and multiple temperature control chambers needing temperature regulation, and further includes air duct structure.

[0019] Further, the rear side in the vending cabinet is provided with air duct layer, and the air outlet pipeline and the air return pipeline are arranged in the air duct layer.

[0020] Further, the panel at the air duct layer is provided with opening for mounting air return and air outlet.

[0021] Compared with the prior art, the utility model discloses a kind of air duct structure and vending cabinet the utility model proposes a kind of air duct structure, evaporator and fan are arranged in heat exchange chamber, air outlet duct and return air duct are connected with heat exchange chamber, air outlet duct passes each temperature control chamber and is equipped with the air outlet of switchable corresponding each temperature control chamber, return air duct passes each temperature control chamber, and is equipped with return air port corresponding each temperature control chamber, compared with the multi-temperature zone vending cabinet product in market, the air duct structure of the utility model only needs single heat exchange component and air inlet duct and air outlet duct matching, temperature regulation of the multi-temperature zone of vending cabinet can be completed. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical scheme in the embodiment of the utility model, the drawings needed to be used in the embodiment or prior art description will be simply introduced below, and obviously, the drawings in the following description are only some embodiments of the utility model, and for ordinary skilled person in the art, other drawings can be obtained according to these drawings without creative labor.

[0023] Figure 1 It is prior art structure schematic diagram of the utility model;

[0024] Figure 2 It is prior art structure schematic diagram of the utility model;

[0025] Figure 3 It is structure schematic diagram of the embodiment of the utility model;

[0026] Figure 4 It is structure schematic diagram of another embodiment of the utility model;

[0027] Figure 5 It is side view of the embodiment of the utility model.

[0028] 1, vending machine;11, foaming layer;12, air duct layer;

[0029] 2, air outlet duct;21, air outlet;

[0030] 3, return air duct;31, return air port;

[0031] 4, heat exchange chamber;41, fan;42, evaporator;

[0032] 5, compensation fan;

[0033] 61, first chamber;62, second chamber;63, third chamber;64, fourth chamber. DETAILED DESCRIPTION

[0034] In order to make the technical problems, technical solutions and beneficial effects of the utility model clearer and more apparent, the utility model will be further described in detail below in combination with the drawings and examples.

[0035] The principles and structures of the utility model will be described in detail below in combination with the drawings and examples.

[0036] As Figures 1-2 shown, in recent years, with the vigorous development of global retail industry, especially the rapid expansion of commercial facilities such as supermarkets and convenience stores at home and abroad, the market has put forward higher requirements for efficient and multifunctional commodity display and sales equipment. Among them, the multi-temperature zone vending machine 1 as an advanced equipment that can meet the storage temperature requirements of different types of goods, its market demand is increasing. This kind of equipment can ensure that food, beverages and other goods are displayed and sold in the best state by accurately controlling the environmental conditions of each temperature zone, effectively improving the freshness and appeal of goods. Most of the multi-temperature zone vending machines 1 on the current market adopt the traditional independent natural return air structure design, that is, each temperature zone is independently equipped with a set of evaporator 42 and fan 41 system. The basic working principle of this design is that the refrigerant flows into the evaporator 42 of each temperature zone after compression and condensation, and the cold quantity is transferred to the temperature zone space through the natural circulation of the fan 41, so as to realize the purpose of cooling. Although this design meets the basic requirements of multi-temperature zone control to some extent, its inherent limitations are increasingly prominent:

[0037] Low space utilization efficiency: each temperature zone needs to be independently set with an evaporator 42 and a fan 41 system, which not only occupies a large amount of internal effective volume of the vending cabinet, but also limits the possibility of customers placing more goods in the limited space, affecting the sales efficiency and profitability.

[0038] High energy consumption: since each temperature zone needs a complete refrigeration cycle system, the working load of the compressor increases, and the whole machine energy consumption rises. In the current global background of advocating energy saving and emission reduction, high energy consumption has become an important factor restricting the market competitiveness of products.

[0039] High cost: the configuration of independent system makes the whole machine need to invest more resources in manufacturing, installation and maintenance, which directly leads to a substantial increase in product cost. This not only affects the market pricing strategy of the product, but also may lose the advantage in the fierce market competition due to high cost.

[0040] In summary, it is urgent to develop a new multi-temperature zone vending cabinet technology that can overcome the above-mentioned defects, realize efficient energy saving, space optimization and cost control, and become a problem to be solved in the industry.

[0041] AsFigures 3-5 The utility model provides a kind of air duct structure, air duct structure is used to connect multiple temperature control chambers and heat exchange chamber, heat exchange chamber is provided with heat exchange assembly, air duct structure includes: air outlet pipeline 2 and return air duct 3.

[0042] Mechanical chamber is a single chamber, condenser and compressor are placed in mechanical chamber.

[0043] Heat exchange chamber 4 is a single chamber for heat exchange, heat exchange chamber 4 is equipped with heat exchange assembly, and heat exchange assembly is evaporator 42 and fan 41.

[0044] Air outlet pipeline 2, air outlet pipeline one end is communicated with the air outlet side of heat exchange chamber, air outlet pipeline passes through each temperature control chamber, and air outlet is equipped with switchable air outlet corresponding each temperature control chamber;Each temperature control chamber is equipped with at least one air outlet 21.Air valve is arranged at air outlet 21 and controls the switch of air outlet, after air valve is opened, air in heat exchange chamber 4 after heat exchange with evaporator 42 is blown to each temperature control chamber from the air outlet 21 of air outlet pipeline 2, and temperature control chamber is temperature-regulated.Air valve of air outlet 21 is closed, which indicates that the chamber provided with air outlet 21 does not need to be temperature-regulated, and air valve of air outlet 21 is opened, which indicates that the chamber participates in heat exchange and can be temperature-regulated.

[0045] Return air duct 3, return air duct one end is communicated with the return air side of heat exchange chamber, air outlet pipeline passes through each temperature control chamber, and return air duct is equipped with return air port corresponding each temperature control chamber.Air in temperature control chamber is temperature-regulated after air outlet 21 blows into temperature control chamber with the air pipe after heat exchange with evaporator 42, then, air in temperature control chamber after air outlet 21 blows into temperature control chamber is heat-exchanged with the air in temperature control chamber originally needing temperature control, and air flows back to heat exchange chamber 4 from return air port 31 and is heat-exchanged with evaporator 42 in heat exchange chamber 4 again, then is blown into temperature control chamber from air outlet 21.Fan 41 is axial fan 41.

[0046] Each temperature control chamber is equipped with at least one air outlet 21, and each air outlet 21 is equipped with an adjustable air valve. This design allows the system to accurately regulate the temperature according to the actual temperature needs of each chamber. When a chamber does not require temperature adjustment, the corresponding air outlet 21 valve of the chamber can be simply closed to save energy. Through the design of the return air duct 3, the system can re-introduce the air that has been heat-exchanged with the evaporator 42 into the heat exchange chamber 4 for further heat exchange. This way of circulating heat exchange greatly improves the heat exchange efficiency of the system, making the temperature control more stable and efficient. The system can be applied to various occasions that require precise temperature control, such as data centers, laboratories, medical facilities, etc. Since each chamber can be independently temperature-controlled, the system has high flexibility and adaptability. This application only needs to set up a set of heat exchange structure to realize temperature regulation of multiple temperature control chambers.

[0047] In further embodiments, a compensation fan 5 is provided in the return air outlet 31. Since the return air duct 3 may have multiple bending parts, a compensation fan 5 is added in the return air duct 3, with the suction direction of the compensation fan 5 facing the return air direction of the return air duct 3, so as to accelerate the return air speed. The compensation fan 5 can be arranged at the bending part of the return air duct 3.

[0048] The compensation fan 5 can accelerate the air flow speed in the return air duct 3, especially in the return air duct 3 with multiple bending parts. By increasing the return air speed, the system can more quickly re-introduce the air that has been heat-exchanged with the evaporator 42 into the heat exchange chamber 4 for further heat exchange, thereby improving the heat exchange efficiency of the entire system. The provision of the compensation fan 5 enables the system to more accurately control the temperature in each temperature control chamber. Due to the increase in return air speed, the system can respond more quickly to temperature changes and adjust the air valve opening degree of the air outlet 21 to maintain a constant temperature. This helps to reduce temperature fluctuations and improve the stability and accuracy of temperature control. By improving the return air efficiency, the compensation fan 5 helps to reduce the energy consumption of the system. Since the system can reach and maintain the required temperature more quickly, the operating time of the compressor and the evaporator 42 may be correspondingly reduced.

[0049] In further embodiments, the air outlets 21 are respectively arranged in the upper half of the temperature control chambers, and the return air outlets 31 are respectively arranged in the lower half of the temperature control chambers.

[0050] The air outlet 21 is located in the upper half, which can ensure that the hot air (in heating mode) or cold air (in cooling mode) can be directly blown to the higher position of the chamber that needs to be adjusted in temperature, and then uniformly distributed in the entire chamber through the convection with the air return port 31. The air return port 31 is located in the lower half, which can more effectively collect the air that has been circulated and may become hot or cold, forming a complete air circulation path. By arranging the air outlet 21 and the air return port 31 in the upper half and the lower half of the chamber respectively, the up-and-down flow of air in the entire chamber can be promoted, which helps to reduce the temperature gradient and make the temperature of each area in the chamber more uniform.

[0051] In a further embodiment, a water pan is arranged below the heat exchange assembly in the heat exchange cavity, specifically below the evaporator 42 of the heat exchange assembly, for collecting the condensed water generated after heat exchange of the evaporator 42, preventing the condensed water from accumulating in the heat exchange cavity 4.

[0052] In a further embodiment, the heat exchange assembly includes an evaporator and a fan, and the air outlet direction of the fan 41 is towards the connection between the air outlet duct 2 and the heat exchange cavity 4. The fan 41 blows the gas that has been heat-exchanged with the evaporator 42 to the air outlet duct 2, so that the heat-exchanged gas flows to each chamber that needs to be adjusted in temperature through the air outlet duct 2.

[0053] In a further embodiment, three temperature control chambers are provided, and one air return port and one air outlet port are arranged in each of the three temperature control chambers. Three air outlet ports 21 are arranged in the three temperature control chambers, and three air return ports 31 are arranged in the three chambers provided with the air outlet ports 21, that is, in this embodiment, each temperature control chamber is provided with one air outlet port 21 and one air return port 31. The number of air outlet ports 21 and air return ports 31 in the temperature control chamber can be adjusted according to actual conditions. The arrangement of one air outlet port 21 and one air return port 31 corresponding to each temperature control chamber can form a convection of air in the temperature control chamber and accelerate the adjustment of temperature.

[0054] In a further embodiment, a temperature sensor is arranged in each temperature control chamber. The temperature sensor can detect the temperature in the temperature control chamber, and by comparing the detected temperature with the actual temperature, it can be determined whether to open the air valve of the chamber or close the air valve of the chamber.

[0055] In another embodiment, a second air valve is arranged at the air return port 31, which controls whether the chamber participates in air return through the second air valve at the air return port 31, and prevents the phenomenon of backflow caused by air return through the air return port 31 of the chamber when other chambers return air.

[0056] The utility model discloses still propose a kind of selling cabinet, including the heat exchange chamber being equipped with evaporator and fan, the mechanical cavity being equipped with condenser and compressor and multiple temperature-regulated chamber needing to regulate and control temperature, further including the air duct structure of the utility model.

[0057] The rear side of the selling cabinet is provided with an air duct layer 12, and the air inlet duct and the air outlet duct 2 of the air duct structure are arranged in the air duct layer 12. The faceplate at the air duct layer 12 is provided with openings for mounting the return air outlet 31 and the air outlet 21, and the return air outlet 31 and the air outlet 21 can be directly mounted at the openings. The air inlet duct and the return air duct 3 are mounted in the air duct layer 12 and are covered by the foaming layer 11 to prevent the loss of cold energy.

[0058] The air duct structure is arranged in the air duct layer 12, which solves the problems of the conventional multi-temperature zone selling cabinet, such as the reduction of effective volume in the cabinet, high energy consumption of the unit, high production cost and the like, due to the use of multiple groups of evaporators 42 for air supply systems.

[0059] By designing the air duct structure, single-system multi-temperature zone air supply is realized, the effective volume in the selling cabinet is effectively increased, and the energy consumption of the unit is reduced.

[0060] In an embodiment, the selling cabinet is provided with three temperature-regulated chambers, namely a first chamber 61, a second chamber 62 and a third chamber 63. The rear side of the selling cabinet is provided with an air duct layer 12 for mounting the air inlet duct and the return air duct 3, and the bottom of the selling cabinet is provided with a mechanical chamber and a heat exchange chamber, respectively. The condenser and the compressor and other connecting pipes and accessories are arranged in the mechanical chamber, and the compressor and the fan 41 are arranged in the heat exchange chamber. The air outlet duct 2 is provided with a communication passage with the heat exchange chamber 4, and the air outlet duct 2 is provided with three air outlets 21 arranged in the first chamber 61, the second chamber 62 and the third chamber 63, respectively. The return air duct 3 is provided with two passages, one of which is provided with a return air outlet 31 arranged in the first chamber 61, and the other return air duct 3 is provided with two return air outlets 31 arranged in the second chamber 62 and the third chamber 63, respectively.

[0061] In another embodiment, the vending cabinet is provided with four temperature control chambers, namely the first chamber 61, the second chamber 62, the third chamber 63 and the fourth chamber 64. The rear side of the vending cabinet is provided with an air duct layer 12 for installing the air inlet duct and the air return duct 3, and the bottom of the vending cabinet is provided with a mechanical chamber and a heat exchange chamber. The mechanical chamber is provided with a condenser, a compressor and other connecting pipes and accessories, and the heat exchange chamber is provided with a compressor and a fan 41. The air outlet duct 2 is provided with a communication with the heat exchange chamber 4, and the air outlet duct 2 is provided with four air outlets 21 corresponding to the first chamber 61, the second chamber 62, the third chamber 63 and the fourth chamber 64. The air return duct 3 is provided with two air return ducts, one of which is provided with two air return ports 31 arranged in the first chamber 61 and the second chamber 62, and the other air return duct 3 is provided with two air return ports 31 arranged in the third chamber 63 and the fourth chamber 64.

[0062] The main working principle of the air duct structure is as follows:

[0063] The refrigerant passes through the throttle and enters the evaporator 42 in the mechanical chamber. The evaporator 42 exchanges heat with the air in the heat exchange area, and the cooled air is blown into the air inlet duct by the fan 41. The cold air is transported to each temperature control chamber along the air inlet duct. The air valve of each temperature control chamber is opened when the chamber needs to be cooled. The temperature sensor in the temperature zone detects the temperature and switches the air valve to maintain the temperature of the temperature zone. The temperature of the cold air increases after passing through the temperature zone, and the high-temperature gas enters the air return duct 3 and returns to the heat exchange chamber 4 along the air return duct 3. In order to compensate for the air return resistance caused by the corner of the air return duct 3, a compensation fan 5 is added at the end of the air return duct to improve the air return capacity of the air return duct 3. After passing through the compensation fan 5, the high-temperature gas returns to the heat exchange area and is sucked into the evaporator 42 by the fan 41 for heat exchange. The air duct system circulates to achieve temperature control of multiple temperature zones by a single system.

[0064] The vending cabinet has a special air duct structure, which is different from the traditional single system corresponding to a single temperature zone, and the vending cabinet structure needs multiple refrigeration systems. The utility model only needs one set of heat exchange assembly and one air return compensation fan 5, and only one air valve is needed for each temperature zone to control refrigeration, which greatly improves the effective volume of the vending cabinet, avoids the complex and high-cost structure of multiple temperature zones and multiple systems, reduces the installation difficulty and improves the production efficiency.

[0065] Compared with the prior art, the air duct structure is provided with an evaporator 42 and a fan 41 in a heat exchange chamber 4, an air outlet pipeline 2 and an air return pipeline 3 are connected with the heat exchange chamber 4, the air outlet pipeline passes through each temperature control chamber and is provided with an air outlet opening corresponding to each temperature control chamber, the air return pipeline passes through each temperature control chamber and is provided with an air return opening corresponding to each temperature control chamber, compared with the existing multi-temperature zone selling cabinet product in the market, the air duct structure of the utility model only needs a single heat exchange assembly and an air inlet pipeline and an air outlet pipeline 2 to match, so that the temperature regulation of the multi-temperature zone of the selling cabinet can be completed.

[0066] It should be noted that the terminology used above is for the purpose of describing particular embodiments only and is not intended to limit exemplary embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, steps, operations, elements, components, and / or groups thereof, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof.

[0067] The relative arrangement of parts and steps, numerical expressions, and numerical values set forth in the examples are not intended to limit the scope of the present application, unless otherwise specifically indicated. At the same time, it should be understood that the sizes of the various parts shown in the drawings are not drawn in proportion to the actual proportions. The techniques, methods and devices known to those skilled in the relevant art can not be discussed in detail, but under appropriate circumstances, the techniques, methods and devices should be considered as part of the authorized specification. In all examples shown and discussed herein, any specific value should be interpreted as merely exemplary, and not as a limitation. Therefore, other examples of exemplary embodiments can have different values. It should be noted that similar reference numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0068] In the description of the present application, it should be understood that the orientation words such as "front, rear, upper, lower, left, right", "horizontal, vertical, perpendicular, horizontal" and "top, bottom" and the like indicate the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and in the absence of the opposite indication, these orientation words do not indicate and imply that the indicated device or element must have a specific orientation or be constructed and operated in a specific orientation, therefore it cannot be understood as a limitation on the scope of protection of the present application; the orientation words "inner, outer" refer to the inner and outer of the contour of each component itself.

[0069] For purposes of the description hereinafter, spatial relative terms, such as "above", "below", "upper", "lower", and the like, can be used to describe the relative position of one element or feature to another as illustrated in the figures. It will be understood that the spatial relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientations depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "up" other elements or features would then be oriented "below" or "down" the other elements or features. Thus, the exemplary term "above" can encompass both an orientation of above and below. The device can be otherwise oriented (rotated 90 degrees or at other orientations) and the spatial relative descriptors used herein interpreted accordingly.

[0070] In addition, it should be noted that the use of "first", "second", and the like words of distinction do not connote any meaning of importance, but are used solely to differentiate one element from another, and are used in the context of this application without implying any specific order, or order of precedence. Accordingly, a first element that follows an operation can be performed before, after, or at the same time as a second element that precedes the operation.

[0071] The preferred embodiments of the present application have been described above with the purpose of enabling not only the best modes of practicing the application known to the inventors at this time, but also of enabling others skilled in the art to utilize the application in various embodiments and with various modifications as are suited to the particular use contemplated. Therefore, the above description is intended to be illustrative, but not restrictive, of the scope of the present application. All patents and patent applications mentioned herein are incorporated by reference in their entirety.

Claims

1. A wind channel structure for connecting a plurality of temperature-controlled chambers with a heat exchange chamber, wherein a heat exchange assembly is arranged in the heat exchange chamber, characterized in that, The air duct structure comprises: an air outlet duct, one end of which is communicated with the air outlet side of the heat exchange chamber, the air outlet duct passing through each temperature control chamber and being provided with an openable air outlet corresponding to each temperature control chamber; an air return duct, one end of which is communicated with the air return side of the heat exchange chamber, the air return duct passing through each temperature control chamber and being provided with an air return corresponding to each temperature control chamber.

2. The air duct structure according to claim 1, wherein The air return duct is further provided with a compensation fan, the air suction direction of the compensation fan being towards the air return direction of the air return duct.

3. The air duct structure according to claim 1, wherein The air outlet is arranged in the upper half of the temperature control chamber, and the air return is arranged in the lower half of the temperature control chamber.

4. The air duct structure of claim 1, wherein A water receiving tray is arranged below the heat exchange assembly in the heat exchange chamber.

5. The air duct structure according to claim 1, wherein The heat exchange assembly comprises an evaporator and a fan, the air outlet direction of the fan being towards the connection between the air outlet duct and the heat exchange chamber.

6. The air duct structure of claim 1, wherein The temperature control chamber is provided with three, and each of the three temperature control chambers is provided with one air return and one air outlet.

7. The air duct structure according to claim 1, wherein Each air outlet is provided with a wind valve, and each air return is provided with a second wind valve.

8. A merchandising cabinet comprising a heat exchange chamber provided with an evaporator and a fan, a mechanical chamber provided with a condenser and a compressor, and a plurality of temperature controlled chambers requiring temperature regulation, characterized in that, The air duct structure of any one of claims 1-7 is further included.

9. The merchandising cabinet of claim 8, wherein, The rear side of the sales cabinet is provided with an air duct layer, and the air outlet duct and the air return duct are arranged in the air duct layer.

10. The merchandising cabinet of claim 9, wherein, An opening is arranged on the panel at the air duct layer for mounting the air return and the air outlet.

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