A three-dimensional circulating air display case

Abstract

The present application relates to display cabinet technical field, specifically, it relates to a kind of three-dimensional circulating air display cabinet, including cabinet, and the shelf component for placing refrigerated goods is separately provided for the refrigeration assembly of the refrigeration inside display cabinet and the refrigeration assembly in the middle of four corners in cabinet;Refrigeration assembly includes outer frame, top cover and water receiving box, air door driving structure and fan structure installed on the upper and lower end of outer frame, air door driving structure includes air door mechanism for guiding circulating air and driving mechanism for driving air door mechanism.The display cabinet can circulate air by setting refrigeration assembly in the four corners of cabinet, and the circulating distance of air is the width of two inner containers and the depth of two inner containers, which is greatly reduced, and there is no obstruction in the circulating path, which can improve the heat exchange efficiency, and the shelf component provided can separate the shelf and the rotating rod to facilitate cleaning after long-term use.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of display cabinets, and particularly relates to a three-dimensional circulating air display cabinet. BACKGROUND

[0002] The vertical air-cooled display cabinet is a commonly used refrigeration equipment, in the existing vertical air-cooled display cabinet, the evaporator is above the cabinet body, the air circulation is blown out from the rear part of the cabinet body after being sucked by the evaporative fan, and the cold air flow is sucked into the evaporative fan again after flowing through the multiple layers of goods to realize circulation. Such air duct design causes the air circulation path to pass through two inner pot heights and two inner pot depths, the air circulation distance is long, and the flow speed is slow, the cold energy circulation efficiency is low, the cooling is slow, in addition, the shelves are square shelves, taking bottled drinks as an example, the goods display actually only displays the outer layer, and the inner goods are difficult to find, which is not conducive to display.

[0003] For example, the invention patent with the authorized announcement number CN116172373A discloses a kind of in the refrigeration and freezing technical field including cabinet, cabinet door, evaporator, evaporative fan, cross-flow fan and flow equalizing plate;Cabinet is formed with storage room inside;Evaporator is installed at the top of storage room and close to the back wall of storage room;Evaporative fan is installed at the top of storage room and is located at the side of evaporator away from the back wall of storage room;Cross-flow fan is installed at the top of storage room, is located at the side of evaporative fan away from evaporator and close to the front wall of storage room;Flow equalizing plate is located at the top edge of the opening of storage room, for shunting the cold air blown out by cross-flow fan and guiding cold air to flow downwards, to form the wind curtain that flows from top to bottom at the opening of storage room.

[0004] Although the above-mentioned display cabinet can change the flow path of cold air to form a wind curtain to save energy and protect the environment, the circulating air in the display cabinet is still up and down circulation, and in use, the problems of long circulation distance and flowing through goods still exist, which leads to low cold energy circulation efficiency and slow cooling. In order to solve the above-mentioned problems, we propose a three-dimensional circulating air display cabinet.

[0005] The information disclosed in this BACKGROUND section is only intended to increase an understanding of the general context in which the present application can be practiced. It is not admitted that any of the information provided in this section constitutes prior art. SUMMARY

[0006] The purpose of the present application is to provide a three-dimensional circulating air display cabinet to solve the above-mentioned problems of the prior art.

[0007] In order to achieve the above object, the application provides a three-dimensional circulating air display cabinet, which comprises a cabinet body, characterized in that: four corner positions and a middle position in the cabinet body are respectively provided with a refrigeration assembly for refrigeration inside the display cabinet and a shelf assembly for placing refrigerated articles.

[0008] The refrigeration assembly comprises an outer frame, a top cover and a water collecting box installed on the upper and lower ends of the outer frame, a damper driving structure and a fan structure, the damper driving structure comprises a damper mechanism for guiding circulating air and a driving mechanism for driving the damper mechanism, the damper mechanism comprises two connecting rods, a plurality of dampers regularly and fixedly installed on the connecting rods and a connecting tooth coaxially and fixedly installed at the top end of the connecting rod, the outer frame is provided with an air outlet and an air inlet on the side surface, the damper mechanism position corresponds to the air outlet and the air inlet, the outer frame is a columnar structure with a horizontal cross section in the shape of a sector, the air outlet and the air inlet are arranged on the arc surfaces of the outer frame close to the two straight sides, and the air outlets and the air inlets of the four refrigeration assemblies are regularly distributed in an alternating clockwise or counterclockwise direction.

[0009] The driving mechanism comprises a first motor fixedly installed above the top cover through a mounting bracket, a first transmission tooth group and two second transmission tooth groups in transmission connection with the output shaft of the first motor, and a movable block for transmission connection with the damper mechanism, the top surface of the top cover is provided with a movable groove corresponding to the position of the damper mechanism, the movable block is installed in the movable groove, the inner side wall and the outer side wall of the movable groove are respectively provided with a first arc-shaped groove and two second arc-shaped grooves, the first arc-shaped groove is provided with a transmission tooth, the connecting tooth is located in the corresponding second arc-shaped groove, and the inner side wall and the outer side wall of the movable block are provided with tooth surfaces and are respectively in meshing connection with the transmission tooth on the same side and the connecting tooth on the same side.

[0010] In normal use, the included angle between the air inlet direction and the air outlet direction of the four refrigeration assemblies is 90°, and the circulating air can form a 360° circulating three-dimensional air flow, when defrosting is needed, the opposite refrigeration assemblies are a group, the first group of refrigeration assemblies normally refrigerate, and the driving mechanism is started to drive the dampers at the air outlet and the air inlet to rotate synchronously to adjust the circulating air angle to 45°, and the air inlet direction and the air outlet direction are parallel, the air outlets and the air inlets of the refrigeration assemblies of the other group are closed, heating defrosting is started, and the next group of defrosting is carried out after the defrosting is completed.

[0011] The first transmission gear group is composed of one horizontal and two vertical bevel gears, the second transmission gear group is composed of one horizontal and one vertical bevel gear, the output shaft of the first motor is coaxially connected with the horizontal bevel gear of the first transmission gear group, the two vertical bevel gears in the first transmission gear group are coaxially connected with the vertical bevel gears in the second transmission gear group on both sides respectively, and the horizontal bevel gear in the second transmission gear group is coaxially connected with the transmission gear on the same side.

[0012] In the technical scheme, the left and right widths of the movable groove are greater than the left and right lengths of the movable block, the groove bottom surface of the movable groove is fixed with two symmetrical limiting rods on the left and right sides, the middle part of the movable block is provided with a positioning groove with a diameter matching the limiting rods along the left and right directions, the distance between the two limiting rods is less than the left and right lengths of the positioning groove, and the top end of the connecting rod is coaxially connected with the corresponding connecting tooth through the bottom surface of the corresponding second arc-shaped groove.

[0013] In the technical scheme, the fan structure comprises a fan fixed vertically in the outer frame in a columnar shape, an evaporator arranged in an arc shape close to the air inlet, and a second motor fixed in the middle part of the bottom surface of the top cover through a mounting plate.

[0014] In the technical scheme, the shelf assembly comprises a rotating rod arranged in the middle part of the cabinet body, a third motor mounted on the top of the rotating rod, and a plurality of shelves regularly distributed above and below the rotating rod, the rotating rod is provided with a plurality of front and rear through insertion slots corresponding to the shelves, the insertion slots are provided with a latch structure, the middle part of the bottom surface of the rotating rod is inserted with a positioning column, and the bottom surface of the rotating rod is inserted with the positioning column.

[0015] In the technical scheme, the latch structure comprises a first pin rod and a second pin rod, the first pin rod is concave, and the left and right widths of the middle concave part of the first pin rod and the second pin rod are equal and equal to half of the left and right widths of the insertion slot.

[0016] In the technical scheme, the second pin rod is provided with a movable cavity and an extrusion cavity in front and back respectively, the movable cavity is provided with a pressing rod, the rear end of the pressing rod penetrates through the rear sidewall of the movable cavity and extends into the extrusion cavity, the extrusion cavity is provided with a first spring, the front end of the pressing rod penetrates out of the front sidewall of the movable cavity, and the front end of the pressing rod is provided with a pressing cap made of rubber material.

[0017] In the technical scheme of the present application, the middle part of the right side wall of the movable cavity is provided with a plug rod groove, a plug rod is arranged in the plug rod groove, the inner end of the plug rod penetrates out of the plug rod groove and is connected with the pressing rod through a slope rod, both ends of the slope rod are hinged, the outer end of the plug rod penetrates out of the plug rod groove, and the left side wall of the first pin rod is provided with a plug hole matched with the plug rod.

[0018] In the technical scheme of the present application, the middle part of the right side wall of the movable cavity is provided with a plug rod groove, a plug rod is arranged in the plug rod groove, the inner end of the plug rod penetrates out of the plug rod groove and is connected with the pressing rod through a slope rod, both ends of the slope rod are hinged, the outer end of the plug rod penetrates out of the plug rod groove, and the left side wall of the first pin rod is provided with a plug hole matched with the plug rod.

[0019] In conclusion, due to the adoption of the above technical scheme, the present application has the following advantages:

[0020] 1、In the present application, four refrigeration assemblies are arranged at four corners in the cabinet, the included angle between the air inlet direction and the air outlet direction is 90°, the air circulation can be inhaled and blown out, the circulation distance is greatly reduced, and there is no obstruction on the circulation path, so that the heat exchange efficiency can be improved.

[0021] 2、In the present application, the driving mechanism drives the connecting rod to rotate to realize the opening and closing of the air door, and adjusts the opening angle of the air door according to the use state, such as defrosting and normal working state, thereby reducing the influence of temperature rise during defrosting.

[0022] 3、In the present application, the user holds the front and back of the second pin rod with both hands and presses the pressing rod, then drives the plug rod to retreat into the plug rod groove through the slope rod, at this time, the second pin rod can be pushed, and the first pin rod can be removed to release the locking, so that the shelf and the rotating rod can be separated, and the shelf can be rotated by the third motor, so that the goods can be displayed in 360° without dead angle, the display area is improved, and the goods are convenient to take. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of the present application;

[0024] Figure 2 It is a structure schematic diagram of the refrigeration assembly of the present application;

[0025] Figure 3 It is an explosion view of the refrigeration assembly structure in the present application;

[0026] Figure 4 It is an explosion view of the air door driving structure in the present application;

[0027] Figure 5Structure diagram of shelf assembly in the present application;

[0028] Figure 6 Structure explosion diagram of shelf assembly in the present application;

[0029] Figure 7 Structure diagram of second pin rod in the present application;

[0030] Figure 8 Enlarged view of structure at A in the present application;

[0031] Figure 9 Circulating air diagram of show case in normal working cycle in the present application;

[0032] Figure 10 Circulating air diagram of show case in defrosting cycle in the present application.

[0033] Explanation of reference signs:

[0034] 1, cabinet body;

[0035] 2, refrigeration assembly; 21, outer frame; 211, air outlet; 212, air inlet; 22, top cover; 221, movable groove; 2211, first arc-shaped groove; 2212, second arc-shaped groove; 222, mounting plate; 23, water collecting box; 24, damper driving structure; 241, damper mechanism; 2411, damper; 2412, connecting rod; 2413, connecting tooth; 242, driving mechanism; 2421, first motor; 2422, mounting bracket; 2423, first transmission tooth set; 2424, second transmission tooth set; 2425, movable block; 2425a, positioning groove; 2426, transmission tooth; 2427, limiting rod; 25, fan structure; 251, fan; 252, evaporator; 253, second motor; 254, heating pipe;

[0036] 3, shelf assembly; 31, third motor; 32, rotating rod; 321, insertion slot; 33, shelf; 34, bolt structure; 341, first pin rod; 342, second pin rod; 3421, movable cavity; 3422, extrusion cavity; 3423, pressing rod; 3424, first spring; 3425, inclined rod; 3426, insertion rod; 3427, flange; 3428, second spring; 3429, insertion rod slot; 35, positioning column. DETAILED DESCRIPTION

[0037] The specific embodiments of the present application are described in detail below with reference to the accompanying drawings, but it should be understood that the protection scope of the present application is not limited by the specific embodiments.

[0038] Unless specifically stated otherwise, throughout the specification and claims, the term "comprise" or variations such as "comprises" or "comprising" will be understood to imply the inclusion of a stated element or group of elements but not the exclusion of any other element or group of elements.

[0039] Referring to Figures 1-10 As shown in the drawings, a three-dimensional circulating air display cabinet of the present application comprises a cabinet body 1, a refrigeration assembly 2 for refrigerating the inside of the display cabinet and a shelf assembly 3 for placing refrigerated articles are respectively arranged at the four corners and the middle of the cabinet body 1;

[0040] In this embodiment, as Figures 2-4 shown, the refrigeration assembly 2 comprises an outer frame 21, a top cover 22 and a water collecting box 23 mounted on the upper and lower ends of the outer frame 21, the water collecting box 23 can collect water generated during defrosting, a damper driving structure 24 comprising a damper mechanism 241 for guiding circulating air and a driving mechanism 242 for driving the damper mechanism 241, the damper mechanism 241 comprises two connecting rods 2412, a plurality of dampers 2411 regularly and fixedly mounted on the connecting rods 2412, and a connecting tooth 2413 coaxially and fixedly mounted on the top end of the connecting rod 2412, the outer frame 21 is provided with an air outlet 211 and an air inlet 212 on the side surface, the position of the damper mechanism 241 corresponds to the air outlet 211 and the air inlet 212, the opening angle of the damper 2411 is adjusted by driving the connecting rod 2412 to rotate through the driving mechanism 242, and then the influence of temperature rise during defrosting is reduced, according to the use state, such as defrosting and normal working state;

[0041] The driving mechanism 242 comprises a first motor 2421 fixedly mounted above the top cover 22 through a mounting bracket 2422, the mounting bracket 2422 is fixed on the top cover 22 by bolts, the first motor 2421 is fixed on the mounting bracket 2422 by bolts, the top surface of the top cover 22 is provided with a movable groove 221 corresponding to the position of the damper mechanism 241, a movable block 2425 is mounted in the movable groove 221, the inner side wall and the outer side wall of the movable groove 221 are respectively provided with a first arc-shaped groove 2211 and two second arc-shaped grooves 2212, a transmission tooth 2426 is arranged in the first arc-shaped groove 2211, the connecting tooth 2413 is located in the second arc-shaped groove 2212, the inner side wall and the outer side wall of the movable block 2425 are both provided with tooth surfaces and are respectively engaged with the same side transmission tooth 2426 and the same side connecting tooth 2413, in use, the first motor 2421 drives the first transmission tooth set 2423 and the second transmission tooth set 2424 to transmit, so that the two side transmission teeth 2426 rotate in the same direction to drive the two side movable blocks 2425 to slide along the movable groove 221, and then the connecting teeth 2413 in the same refrigeration assembly 2 rotate in the same direction, finally ensuring that the dampers 2411 at the air outlet 211 and the air inlet 212 rotate synchronously to realize the angle adjustment of the circulating air.

[0042] Further, the output shaft of the first motor 2421 is coaxially connected with the horizontal bevel gear of the first transmission gear set 2423. The horizontal bevel gear of the first transmission gear set 2423 is driven to rotate by the first motor 2421, and then the vertical bevel gears on both sides of the first transmission gear set 2423 are driven to rotate, and then the horizontal bevel gears are driven to rotate by the vertical bevel gears of the second transmission gear set 2424, and finally the same-side transmission gears 2426 are coaxially driven to rotate. The transmission gears 2426 in the same refrigeration assembly 2 can be synchronously and uniformly rotated.

[0043] Specifically, the left and right widths of the movable groove 221 are greater than the left and right lengths of the movable block 2425, so that the movable block 2425 can slide in the movable groove 221. The groove bottom surface of the movable groove 221 is fixed with two symmetrical limiting rods 2427 on the left and right sides. The middle part of the movable block 2425 is provided with a positioning groove 2425a which is adapted to the rod diameter of the limiting rod 2427 along the left and right directions. The distance between the two limiting rods 2427 is less than the left and right lengths of the positioning groove 2425a. By setting the limiting rod 2427 and the positioning groove 2425a, the movable block 2425 can be prevented from shaking left and right, and the limiting rod 2427 can be prevented from blocking the sliding of the movable block 2425. The top end of the connecting rod 2412 passes through the bottom surface of the corresponding second arc-shaped groove 2212 and is coaxially connected with the corresponding connecting tooth 2413.

[0044] In addition, the fan structure 25 includes a fan 251 vertically placed and fixed in the outer frame 21 in a columnar shape, an evaporator 252 arranged in an arc shape close to the air inlet 212, and a second motor 253 fixed on the middle part of the bottom surface of the top cover 22 through the setting of the mounting plate 222. The mounting plate 222 is fixed on the bottom surface of the top cover 22 by bolts, and the second motor 253 is fixed on the mounting plate 222 by bolts. The evaporator is clamped at the top of the outer frame 21 and fixed at the bottom by screws, and a heating pipe 254 is arranged on the evaporator 252 along the U-shaped evaporator.

[0045] In this embodiment, as Figures 9-10 The outer frame 21 is a columnar structure with a fan-shaped horizontal cross section. The air outlet 211 and the air inlet 212 are arranged on the arc surfaces of the outer frame 21 close to the straight edges on both sides. The air outlets 211 and air inlets 212 of the four refrigeration assemblies 2 are alternately and regularly distributed in the clockwise or counterclockwise direction. When working normally, the included angle between the air inlet direction and the air outlet direction of the four refrigeration assemblies 2 is 90°, and the circulating air can form a 360° circulating three-dimensional wind. When defrosting is needed, the diagonal refrigeration assemblies 2 form a group, the first group of refrigeration assemblies works normally, the air door angle is adjusted by 45°, and the air inlet direction and the air outlet direction are parallel. The air outlets 211 and air inlets 212 of the other group of refrigeration assemblies 2 are closed, and the heating pipes 254 inside are started to heat and defrost, reducing the influence of temperature rise during defrosting. After defrosting, the next group of defrosting is carried out, and the steps are the same as above.

[0046] In this embodiment, as Figures 5-8 As shown, the shelf assembly 3 includes a rotating rod 32 located in the middle of the cabinet 1, a third motor 31 installed on the top of the rotating rod 32, and several shelves 33 regularly distributed vertically on the rotating rod 32. The third motor 31 is fixed to the middle of the inner top surface of the cabinet 1 by bolts. The rotating rod 32 is provided with several slots 321 that are through the front and back corresponding to the shelves 33. The slots 321 are provided with pin structures 34. The bottom surface of the cabinet 1 is provided with a positioning post 35. The bottom surface of the rotating rod 32 is inserted into the positioning post 35. The pin structure 34 is located below the corresponding shelf 33, which can play a supporting role and facilitate the separation and removal of the shelf 33 from the rotating rod 32.

[0047] Furthermore, the pin structure 34 includes a first pin 341 and a second pin 342. The first pin 341 is concave. The width of the concave part in the middle of the first pin 341 and the width of the second pin 342 are equal and both equal to half the width of the slot 321. In use, the first pin 341 is first inserted into the slot 321 and the concave part of the first pin 341 is pressed against the right wall of the slot 321. Then the second pin 342 is inserted. At this time, the front and rear protruding parts of the first pin 341 are just locked on the front and rear sides of the rotating rod 32, thereby achieving fixation. At the same time, the extended part can play the role of supporting the shelf 33.

[0048] Furthermore, the second pin 342 has a movable cavity 3421 and a pressing cavity 3422 in its front and rear parts, respectively. A pressing rod 3423 is provided in the movable cavity 3421. The rear end of the pressing rod 3423 passes through the rear side wall of the movable cavity 3421 and extends into the pressing cavity 3422. The size of the rear end of the pressing rod 3423 in the pressing cavity 3422 is larger than the diameter of the front end of the pressing rod 3423 to prevent it from slipping out. The size of the pressing cavity 3422 is the same as the size of the rear end of the pressing rod 3423. A first spring 3424 is provided in the pressing cavity 3422. The front end of the pressing rod 3423 passes through the front side wall of the movable cavity 3421 and has a rubber pressing cap at the front end. By pressing the pressing cap, the pressing rod 3423 can be pushed inward. At the same time, the first spring 3424 can help the pressing rod 3423 return to its original position.

[0049] Specifically, the middle part of the right side wall of the movable cavity 3421 is provided with an insertion rod groove 3429, and an insertion rod 3426 is arranged in the insertion rod groove 3429. The inner end of the insertion rod 3426 penetrates out of the insertion rod groove 3429 and is connected with the pressing rod 3423 through the inclined rod 3425. The two ends of the inclined rod 3425 are hinged. The outer end of the insertion rod 3426 penetrates out of the insertion rod groove 3429. The left side wall of the first pin rod 341 is provided with an insertion hole matched with the insertion rod 3426. When the pressing cap is pressed, the pressing rod 3423 moves inward, and the insertion rod 3426 is driven out of the insertion hole through the inclined rod 3425, and the second pin rod 342 is moved forward and backward to release the locking, and the shelf 33 is removed for cleaning.

[0050] In addition, the side wall of the insertion rod 3426 is provided with a ring-shaped flange 3427 at the right end located in the insertion rod groove 3429. The size of the insertion rod groove 3429 is matched with the size of the flange 3427. The flange 3427 can prevent the insertion rod 3426 from dislocation caused by disengagement from the insertion rod groove 3429, so that the locking cannot be realized. The second spring 3428 is arranged between the left side wall of the insertion rod groove 3429 and the flange 3427. The second spring 3428 can help the insertion rod 3426 to reset. The maximum distance of the outer end of the insertion rod 3426 extending out of the insertion rod groove 3429 is less than the maximum distance of the insertion rod 3426 extending in the insertion rod groove 3429. When the pressing rod 3423 is pressed, the insertion rod 3426 can be completely withdrawn into the insertion rod groove 3429, so that the shelf 33 cannot be removed.

[0051] The working principle of the three-dimensional circulating air display cabinet is specifically as follows:

[0052] In normal use, the included angle between the air inlet direction and the air outlet direction of the four refrigeration assemblies 2 is 90°, and the circulating air can form a 360° circulating three-dimensional air. When the door is opened, the circulating air in the horizontal direction of the two refrigeration assemblies close to the door body forms an air curtain, which reduces the loss of cold quantity in the cabinet. When defrosting is required, the diagonal refrigeration assemblies 2 are a group, the first group of refrigeration assemblies normally refrigerate, and the first motor 2421 is started at the same time. The first transmission gear set 2423 and the second transmission gear set 2424 drive the movable blocks 2425 on both sides to slide along the movable slot 221, so that the connecting gears 2413 in the same refrigeration assembly 2 rotate in the same direction, and finally the air doors 2411 at the air outlets 211 and the air inlets 212 are synchronously rotated to realize the angle adjustment of the circulating air. At this time, the circulating air angle is adjusted to 45°, the air inlet direction and the air outlet direction are parallel, the air outlets 211 and the air inlets 212 of the other group of refrigeration assemblies 2 are closed, the heating pipes 254 in the interiors are started to heat and defrost, the influence of temperature rise during defrosting is reduced, and the next group of defrosting is carried out after the defrosting is completed.

[0053] After long-term use, the front and back of the second pin rod 342 are pinched with both hands and pressed, and then the insertion rod 3426 is driven to retreat into the insertion rod groove 3429 through the inclined rod 3425, at this time, the second pin rod 342 can be pushed out, and the first pin rod 341 can be removed to release the lock.

[0054] The foregoing description of specific exemplary embodiments of the application has been presented for the purposes of illustration and description. It is not intended to be exhaustive or to limit the application to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain the principles of the application and its practical application, to thereby enable others skilled in the art to best utilize the application and various embodiments with various modifications as are suited to the particular use contemplated. It is intended that the scope of the application be defined by the claims and their equivalents.

Claims

1. A stereoscopic circulating air display case comprising a cabinet, characterized by: The cabinet body is provided with refrigeration assemblies for displaying refrigeration inside the cabinet and shelf assemblies for placing refrigerated articles at the four corners and middle part respectively; The refrigeration assembly comprises an outer frame, a top cover and a water collecting box mounted on the upper and lower ends of the outer frame, a damper driving structure and a fan structure. The damper driving structure comprises a damper mechanism for guiding circulating air and a driving mechanism for driving the damper mechanism. The damper mechanism comprises two connecting rods, a plurality of dampers regularly fixedly mounted on the connecting rods and a connecting tooth coaxially fixedly mounted on the top end of the connecting rod. The outer frame is provided with air outlets and air inlets on the side surfaces. The damper mechanism is positioned corresponding to the air outlets and the air inlets. The outer frame is a columnar structure with a horizontal section in the shape of a sector. The air outlets and the air inlets are arranged on the arc surfaces of the outer frame near the two straight sides respectively. The air outlets and the air inlets of the four refrigeration assemblies are regularly distributed in an alternating clockwise or counterclockwise direction. The driving mechanism comprises a first motor fixedly mounted above the top cover through a mounting bracket, a first transmission tooth group and two second transmission tooth groups in transmission connection with the output shaft of the first motor and a movable block for transmission connection with the damper mechanism. The top surface of the top cover is provided with a movable groove corresponding to the position of the damper mechanism. The movable block is mounted in the movable groove. The inner side wall and the outer side wall of the movable groove are respectively provided with a first arc-shaped groove and two second arc-shaped grooves. The first arc-shaped groove is provided with a transmission tooth. The connecting tooth is located in the corresponding second arc-shaped groove. The inner side wall and the outer side wall of the movable block are provided with tooth surfaces and are respectively in meshing connection with the transmission tooth on the same side and the connecting tooth on the same side. In normal use, the included angle between the air inlet direction and the air outlet direction of the four refrigeration assemblies is 90°. The circulating air can form a 360° circulating three-dimensional wind. When defrosting is needed, the opposite refrigeration assemblies are a group. The first group of refrigeration assemblies normally refrigerate. At the same time, the driving mechanism is started to drive the dampers at the air outlets and the air inlets to rotate synchronously to adjust the circulating air angle to 45°. The air inlet direction and the air outlet direction are parallel. The air outlets and the air inlets of the refrigeration assemblies of the other group are closed. The heating defrosting is started. After the defrosting is completed, the next group of defrosting is carried out. The steps are the same as above.

2. A three-dimensional circulating air display case as claimed in claim 1, characterized in that: The first transmission tooth group is composed of one horizontal bevel gear and two vertical bevel gears. The second transmission tooth group is composed of one horizontal bevel gear and one vertical bevel gear. The output shaft of the first motor is coaxially connected with the horizontal bevel gear of the first transmission tooth group. The two vertical bevel gears in the first transmission tooth group are respectively coaxially connected with the vertical bevel gears in the second transmission tooth groups on both sides. The horizontal bevel gear in the second transmission tooth group is coaxially connected with the transmission tooth on the same side.

3. A three-dimensional, circulating air display case as in claim 1, wherein: The left and right widths of the movable slot are greater than the left and right lengths of the movable block, the bottom surface of the movable slot is fixed with two symmetrical limiting rods in the middle, the middle of the movable block is provided with a positioning slot along the left and right directions, the rod diameter of the limiting rod is matched with the positioning slot, the distance between the two limiting rods is less than the left and right length of the positioning slot, and the top end of the connecting rod is coaxially connected with the corresponding connecting tooth through the bottom surface of the corresponding second arc-shaped slot.

4. A three-dimensional, circulating air display case as defined in claim 1, wherein: The fan structure comprises a fan fixed in the outer frame in a columnar shape, an evaporator arranged in an arc shape near the air inlet, and a second motor fixed on the middle of the bottom surface of the top cover through a mounting plate.

5. A three-dimensional, circulating air display case as defined in claim 1, wherein: The shelf assembly comprises a rotating rod arranged in the middle of the cabinet body, a third motor mounted on the top of the rotating rod, and a plurality of shelves regularly distributed above and below the rotating rod, the rotating rod is provided with a plurality of front and rear through insertion slots corresponding to the shelves, the insertion slot is provided with a latch structure, the middle of the bottom surface of the rotating rod is inserted with a positioning column, and the bottom surface of the rotating rod is inserted with the positioning column.

6. A three-dimensional, circulating air display case as in claim 5, wherein: The latch structure comprises a first pin rod and a second pin rod, the first pin rod is concave, and the left and right widths of the middle concave part of the first pin rod and the second pin rod are equal and equal to half of the left and right widths of the insertion slot.

7. A three-dimensional, circulating air display case as in claim 6, wherein: The second pin rod is provided with a movable cavity and an extrusion cavity in front and back respectively, the movable cavity is provided with a pressing rod, the rear end of the pressing rod penetrates through the rear wall of the movable cavity and extends into the extrusion cavity, the extrusion cavity is provided with a first spring, the front end of the pressing rod penetrates out of the front wall of the movable cavity, and the front end of the pressing rod is provided with a pressing cap made of rubber material.

8. A three-dimensional, circulating air display case as in claim 7, wherein: The middle of the right side wall of the movable cavity is provided with an insertion rod slot, the insertion rod slot is provided with an insertion rod, the inner end of the insertion rod penetrates out of the insertion rod slot and is connected with the pressing rod through an inclined rod, both ends of the inclined rod are hinged, the outer end of the insertion rod penetrates out of the insertion rod slot, and the left side wall of the first pin rod is provided with an insertion hole matched with the insertion rod.

9. A three-dimensional, circulating air display case as in claim 8, wherein: The insertion rod side wall is provided with a ring-shaped flange at the right end of the part located in the insertion rod slot, the size of the insertion rod slot is matched with the size of the flange, a second spring is arranged between the left side wall of the insertion rod slot and the flange, and the maximum distance of the outer end of the insertion rod extending out of the insertion rod slot is less than the maximum distance of the insertion rod extending in the rod slot.

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