Prepared vegetable freshness locking equipment

Abstract

The invention relates to the technical field of fresh-keeping equipment, in particular to prefabricated vegetable fresh-keeping equipment which comprises a refrigerator body, and the inner wall of the bottom of the refrigerator body is fixedly connected with a supporting frame. The fresh-keeping mechanism comprises outer cylinders fixedly connected to the two sides of the top end of the supporting frame, inner cylinders are slidably connected to the inner walls of the outer cylinders, a motor is installed on the outer wall of one side of the bottom of the refrigerator body, and one end of an output shaft of the motor is connected with a rotating rod through a coupler; rotation of the inner cylinder controls the flow guide angle of the air guide plate through rack transmission, the air guide plate guides cold air to the two sides of the outer cylinder when the placement structure is moved out, the air guide plate guides the cold air to the position of a through hole in the middle of the outer cylinder when the placement structure is reset, overflow of the cold air is further reduced, meanwhile, the temperature in the refrigerator body is more uniform, and the service life of the refrigerator body is prolonged. And the problem that the local temperature is too high or too low is avoided, and the use efficiency of the prefabricated vegetable freshness locking equipment is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of fresh-keeping equipment, and specifically to a fresh-keeping equipment for prefabricated dishes. Background Art

[0002] After being packaged, prefabricated dishes need to be processed by fresh-keeping equipment to maintain the freshness and taste of the ingredients and extend the shelf life.

[0003] When the fresh-keeping equipment for prefabricated dishes performs fresh-keeping freezing treatment on prefabricated dishes, when the prefabricated dishes after fresh-keeping are taken out and new prefabricated dishes are replaced, the door needs to be opened. Directly opening the door will cause the cold air inside the fresh-keeping equipment to dissipate. When the door is closed again, the refrigerator needs to work at a high power to make the fresh-keeping equipment filled with cold air again, increasing the energy consumption of the refrigeration storage equipment. Moreover, the cold air inside is not guided during the replacement process of the prefabricated dishes, and the cold air is likely to overflow from the connection gap of the placement structure, resulting in problems of too high or too low local temperature, affecting the subsequent fresh-keeping treatment of the prefabricated dishes. Summary of the Invention

[0004] The purpose of the present invention is to provide a fresh-keeping equipment for prefabricated dishes to solve the problems raised in the above background art.

[0005] The technical solution of the present invention is: a fresh-keeping equipment for prefabricated dishes, including a refrigerator body, the bottom inner wall of the refrigerator body is fixedly connected with a support frame, and further includes; A fresh-keeping mechanism, the fresh-keeping mechanism includes outer cylinders fixedly connected to both sides of the top of the support frame, the inner wall of the outer cylinder is slidably connected with an inner cylinder, bevel gear sets one are installed on the outer walls of both sides of the bottom end of the support frame, a one-way screw rod is fixedly connected to the inner wall of the top of the bevel gear set one, a threaded tube is threadedly connected to the outer wall of the one-way screw rod, a riser pipe is fixedly connected to the outer wall of the threaded tube, a plurality of support plates are fixedly connected to the outer wall of the riser pipe, an annular groove is arranged on the outer wall of the top end of the support plate, a placement wire rack is slidably connected to the inner wall of the annular groove, fixed frames are fixedly connected to one side outer walls of the top and bottom of the outer cylinder, a driven gear is rotatably arranged in the inner wall of the fixed frame, bevel gear sets two are installed on the outer wall of the fixed frame, mounting frames are fixedly connected to the inner walls of both sides of the refrigerator body, support frames one are fixedly connected to one side outer walls of the top and bottom of the mounting frame, a bidirectional screw rod is fixedly connected to the inner wall of the bottom of the bevel gear set two, a plurality of sliding tubes are threadedly connected to the outer walls of both sides of the bidirectional screw rod, support frames two are fixedly connected to the outer wall of the sliding tube, a rotating shaft is rotatably arranged in the inner walls of the support frame one and the support frame two, a telescopic block is fixedly connected to the outer wall of the rotating shaft, and a wind guiding plate is fixedly connected to one end of the telescopic block.

[0006] Preferably, a motor is installed on the outer wall of one side of the bottom of the refrigerating machine body. One end of the output shaft of the motor is connected to a rotating rod through a coupling. The bottom outer wall of the riser pipe is fixedly connected to a bottom plate. The sliding pipe, the air guide plate and the support plate are distributed in a linear array. Through holes are formed on the outer walls of both sides of the outer cylinder and the inner cylinder. Slide rails are arranged on the inner walls of both sides of the inner cylinder. The bottom plate is slidably connected to the inner wall of the slide rail. Rack bars are fixedly connected to the outer walls of the top and bottom of the inner cylinder. The rack bars are meshed with driven gears. The position of the air guide plate is adapted to that of the through hole. Slide grooves are formed on the inner walls of both sides of the bottom of the outer cylinder. Slide blocks are fixedly connected to the outer walls of both sides of the bottom of the inner cylinder. The slide blocks are slidably connected to the inner wall of the slide groove.

[0007] Preferably, a plurality of first air outlet holes are formed on the outer wall of the riser pipe. The first air outlet holes are distributed in an annular array. A plurality of ventilation holes are formed on the top outer wall of the placement wire rack. The position of the first air outlet holes is adapted to that of the ventilation holes. A top cover is installed on the top outer wall of the refrigerating machine body. Inlet and outlet openings are formed on the outer walls of both sides of the top of the top cover. A top plate is fixedly connected to the top outer wall of the riser pipe. The size of the top plate is adapted to that of the inlet and outlet openings.

[0008] Preferably, a branch pipe is arranged on the bottom inner wall of the refrigerating machine body. Flow dividing pipes are fixedly connected to the inner walls of both sides of the support frame. A telescopic air inlet frame is fixedly connected to the top outer wall of the flow dividing pipe. Circular holes are formed at the four corners of the top outer wall of the telescopic air inlet frame. Air inlet pipes are inserted into the inner walls of the circular holes. Second air outlet holes are formed on the outer walls of both sides of the top of the air inlet pipe. The air inlet pipe and the branch pipe are communicated with the flow dividing pipe.

[0009] Preferably, a connection hole is formed on the top outer wall of the telescopic air inlet frame. A support rod is slidably connected to the inner wall of the connection hole. A limiting protrusion is arranged on the bottom outer wall of the support rod. A limiting plate is fixedly connected to the top outer wall of the support rod. The size of the limiting plate is adapted to that of the circular hole. A return spring is sleeved on the bottom outer wall of the support rod. The two ends of the return spring are respectively fixedly connected to the outer walls of the telescopic air inlet frame and the limiting protrusion.

[0010] Preferably, the telescopic air inlet frame is located directly below the riser pipe. The size of the telescopic air inlet frame is adapted to that of the riser pipe. An air outlet is arranged on one inner wall of the refrigerating machine body. An air return opening is arranged on one outer wall of the support frame. Meshing holes are formed on the outer walls of one side of the top and bottom of the outer cylinder. The sizes of the driven gears and the rack bars are adapted to those of the meshing holes.

[0011] Preferably, the rotating rod is fixedly connected to the bottom inner wall of the first bevel gear set. A spiral blade is fixedly connected to the outer wall of the rotating rod. The size of the spiral blade is adapted to the distance between the support frame and the refrigerating machine body.

[0012] The present invention provides a pre-prepared food freshness-locking device through improvement, which has the following improvements and advantages compared with the prior art: First, the present invention is provided with a refrigerator body, an outer cylinder, an inner cylinder, an air guide plate, a vertical pipe, a threaded pipe and a placement grid. When the pre-prepared dishes are stored and taken out, when the pre-prepared dishes placement structure is moved out, the inner cylinder will rotate and stagger with the through hole of the outer cylinder, and then the vertical pipe will rise to avoid the overflow of cold air. The pre-prepared dishes are placed on the placement grid. When the placement structure returns to the inside of the refrigerator body, the through holes of the outer cylinder and the inner cylinder will overlap again, ensuring that the cold air stably passes through the inner cylinder to lock the freshness of the pre-prepared dishes, and part of the cold air is discharged from the air inlet pipe when the vertical pipe descends to the bottom. The air enters the interior of the vertical pipe and is then evenly output through the air outlet. The cold air from left to right makes the pre-prepared food fresher faster and more evenly locked. The rotation of the inner cylinder also controls the diversion angle of the air guide plate through the rack transmission. When the placement structure is moved out, the air guide plate guides the cold air to the two sides of the outer cylinder. When the placement structure is reset, the air guide plate guides the cold air to the through hole in the middle of the outer cylinder, further reducing the overflow of cold air while making the temperature inside the refrigerator body more uniform, avoiding the problem of local temperature being too high or too low, and improving the use efficiency of the pre-prepared food freshness locking equipment. Secondly, the present invention is provided with a placing grid, a vertical pipe, a rotating rod and a spiral blade. Ventilation holes are arranged on the placing grid, which correspond to the positions of the air outlet holes on the vertical pipe respectively, so as to ensure the uniform cooling and fresh-keeping treatment of the cold air. There is a certain distance between the placing grid and the support plate, so that the cold air can also lock the freshness of the pre-prepared dishes from the bottom of the placing grid, and the cooling is more uniform. The rotating rod can also drive the spiral blade to rotate, further assisting the flow of cold air inside the refrigerator body, thereby improving the fresh-keeping effect of the pre-prepared dishes. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The present invention will be further explained below in conjunction with the accompanying drawings and embodiments: Figure 1 It is a schematic cross-sectional view of the overall structure of the present invention; Figure 2 It is a structural schematic diagram of the pre-prepared dish removal state of the present invention; Figure 3 It is a schematic diagram of the structure of the pre-prepared dish in the fresh-keeping state of the present invention; Figure 4 is a top view of the air guide structure of the present invention; Figure 5 It is an exploded schematic diagram of the grid connection structure of the present invention; Figure 6 It is an exploded schematic diagram of the riser connection structure of the present invention; Figure 7 It is an exploded schematic diagram of the outer cylinder and inner cylinder structure of the present invention; Figure 8 It is a schematic cross-sectional view of the telescopic air inlet frame structure of the present invention; Figure 9 This is an exploded view of the retractable air intake frame structure of the present invention.

[0014] Explanation of reference numerals: 1. Refrigerator body; 2. Air outlet; 3. Air deflector; 4. Mounting frame; 5. Top cover; 6. Support plate; 7. Vertical pipe; 8. Top plate; 9. Placing wire rack; 10. Outer cylinder; 11. Inner cylinder; 12. Unidirectional screw; 13. Motor; 14. Support frame; 15. Rotating rod; 16. First bevel gear set; 17. Spiral blade; 18. Retractable air intake frame; 19. Diverging pipe; 20. Branch pipe; 21. Rack; 22. Driven gear; 23. Bi-directional screw; 24. Second bevel gear set; 25. First bracket; 26. Sliding pipe; 27. Second bracket; 28. First air outlet hole; 29. Bottom plate; 30. Threaded pipe; 31. Chute; 32. Slide block; 33. Air inlet pipe; 34. Limiting plate; 35. Support rod; 36. Return spring; 37. Second air outlet hole. Specific embodiments

[0015] The present invention will be described in detail below. The technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0016] The present invention provides a prefabricated food freshness-keeping device through improvement. The technical solution of the present invention is as follows: As Figures 1-9 shown, a prefabricated food freshness-keeping device includes a refrigerator body 1, and a support frame 14 is fixedly connected to the bottom inner wall of the refrigerator body 1. It also includes; Fresh-keeping mechanism. The fresh-keeping mechanism includes outer cylinders 10 fixedly connected to both sides of the top end of the support frame 14. The inner wall of the outer cylinder 10 is slidably connected with an inner cylinder 11. On the outer walls of both sides of the bottom end of the support frame 14, a first bevel gear set 16 is installed. A one-way screw rod 12 is fixedly connected to the inner wall of the top of the first bevel gear set 16. A threaded pipe 30 is threadedly connected to the outer wall of the one-way screw rod 12. A riser pipe 7 is fixedly connected to the outer wall of the threaded pipe 30. A plurality of support plates 6 are fixedly connected to the outer wall of the riser pipe 7. An annular groove is provided on the outer wall of the top end of the support plate 6. A placement grid 9 is slidably connected to the inner wall of the annular groove. On one side of the top and bottom outer walls of the outer cylinder 10, a fixed frame is fixedly connected. A driven gear 22 is rotatably arranged inside the fixed frame. A second bevel gear set 24 is installed on the outer wall of the fixed frame. Installation frames 4 are fixedly connected to the inner walls of both sides of the refrigeration machine body 1. On one side of the top and bottom outer walls of the installation frame 4, a first support 25 is fixedly connected. A two-way screw rod 23 is fixedly connected to the inner wall of the bottom of the second bevel gear set 24. A plurality of sliding pipes 26 are threadedly connected to both outer walls of the two-way screw rod 23. A second support 27 is fixedly connected to the outer wall of the sliding pipe 26. A rotating shaft is rotatably arranged inside the first support 25 and the second support 27. An expansion block is fixedly connected to the outer wall of the rotating shaft. One end of the expansion block is fixedly connected to a wind guide plate 3.

[0017] Furthermore, a motor 13 is installed on one side of the outer wall of the bottom of the refrigeration machine body 1. One end of the output shaft of the motor 13 is connected to a rotating rod 15 through a coupling. A bottom plate 29 is fixedly connected to the outer wall of the bottom of the riser pipe 7. The sliding pipes 26, the wind guide plates 3, and the support plates 6 are arranged in a linear array. Through holes are provided on the outer walls of both sides of the outer cylinder 10 and the inner cylinder 11. Slide rails are provided on the inner walls of both sides of the inner cylinder 11. The bottom plate 29 is slidably connected to the inner wall of the slide rail. Rack teeth 21 are fixedly connected to the outer walls of the top and bottom of the inner cylinder 11. The rack teeth 21 are meshed with the driven gear 22. The position of the wind guide plate 3 is adapted to that of the through hole. Slide grooves 31 are provided on the inner walls of both sides of the bottom of the outer cylinder 10. Slide blocks 32 are fixedly connected to the outer walls of both sides of the bottom of the inner cylinder 11. The slide blocks 32 are slidably connected to the inner wall of the slide groove 31.

[0018] Furthermore, a plurality of first air outlet holes 28 are provided on the outer wall of the riser pipe 7. The first air outlet holes 28 are arranged in an annular array. A plurality of ventilation holes are provided on the outer wall of the top end of the placement grid 9. The position of the first air outlet holes 28 is adapted to that of the ventilation holes. A top cover 5 is installed on the outer wall of the top end of the refrigeration machine body 1. Inlet and outlet openings are provided on both sides of the top end of the top cover 5. A top plate 8 is fixedly connected to the outer wall of the top end of the riser pipe 7. The size of the top plate 8 is adapted to that of the inlet and outlet openings. A branch pipe 20 is provided on the inner wall of the bottom of the refrigeration machine body 1. A shunt pipe 19 is fixedly connected to the inner walls of both sides of the support frame 14. A telescopic air inlet frame 18 is fixedly connected to the outer wall of the top end of the shunt pipe 19. Circular holes are provided at the four corners of the outer wall of the top end of the telescopic air inlet frame 18. An air inlet pipe 33 is inserted into the inner wall of the circular hole. Second air outlet holes 37 are provided on both sides of the outer wall of the top of the air inlet pipe 33. The air inlet pipe 33 and the branch pipe 20 are communicated with the shunt pipe 19.

[0019] Furthermore, a connection hole is provided on the outer wall of the top end of the telescopic air intake frame 18. A support rod 35 is slidably connected to the inner wall of the connection hole. A limiting protrusion is provided on the outer wall of the bottom end of the support rod 35. A limiting plate 34 is fixedly connected to the outer wall of the top end of the support rod 35. The size of the limiting plate 34 is adapted to the circular hole. A return spring 36 is sleeved on the outer wall of the bottom of the support rod 35. The two ends of the return spring 36 are respectively fixedly connected to the outer wall of the telescopic air intake frame 18 and the limiting protrusion. The telescopic air intake frame 18 is located directly below the vertical pipe 7, and the size of the telescopic air intake frame 18 is adapted to the vertical pipe 7. An air outlet 2 is provided on the inner wall of one side of the refrigerator body 1. A return air outlet is provided on the outer wall of one side of the support frame 14. Meshing holes are provided on the outer walls of one side of the top and bottom of the outer cylinder 10. The sizes of the driven gear 22 and the rack 21 are adapted to the meshing holes. The rotating rod 15 is fixedly connected to the inner wall of the bottom of the first bevel gear set 16. A spiral blade 17 is fixedly connected to the outer wall of the rotating rod 15. The size of the spiral blade 17 is adapted to the distance between the support frame 14 and the refrigerator body 1. Ventilation holes are provided on the placement grid 9, corresponding to the positions of the first air outlet holes 28 on the vertical pipe 7 respectively, to ensure the uniform cooling and freshness preservation treatment of the cold air. There is a certain distance between the placement grid 9 and the support plate 6, so that the cold air can also perform freshness preservation treatment on the prefabricated dishes from the bottom of the placement grid 9, and the cooling is more uniform. The rotating rod 15 can also drive the spiral blade 17 to rotate, further assisting the flow of the cold air inside the refrigerator body 1.

[0020] Working principle: During the freshness preservation process of prefabricated dishes, it is necessary to first move the prefabricated dish placement structure inside the refrigeration machine body 1 outside the refrigeration machine body 1. The refrigeration machine body 1 is connected to an external power supply, and cold air is blown into the interior through the cooperation of the refrigeration structure and the air outlet 2. The motor 13 is started, and the rotating rod 15 rotates. The first bevel gear set 16 and the second bevel gear set 24 are both composed of two meshing bevel gears. The rotating rod 15 is fixedly connected to the bevel gear at the bottom of the first bevel gear set 16, and then drives the bevel gear at the top to rotate, thereby driving the one-way screw rod 12 to rotate. The one-way screw rod 12 is connected to the threaded pipe 30 through threads. At this time, the slider 32 on the inner cylinder 11 is located on one side of the inner chute 31 inside the outer cylinder 10, and the inner cylinder 11 is not limited, and will rotate accordingly under the action of the one-way screw rod 12. When the slider on the inner cylinder 11 slides from the chute 31 to the other side and cannot slide anymore, the one-way screw rod 12 will drive the threaded pipe 30 to rise. At this time, the through holes on the inner cylinder 11 and the outer cylinder 10 are staggered, thereby driving the riser pipe 7, the support plate 6, and the placement grid 9 to rise and move out of the outer wall of the refrigeration machine body 1. Place the prefabricated dishes that need to be freshness-preserved on the placement grid 9. Then, the motor 13 controls the rotating rod 15 to rotate in the reverse direction. Similarly, the inner cylinder 11 will rotate first, so that the through holes on the inner cylinder 11 and the outer cylinder 10 are located at the same position. After the inner cylinder 11 is limited by the slider 32, the one-way screw rod 12 drives the threaded pipe 30 to descend, and the support plate 6 and the placement grid 9 drive the prefabricated dishes back into the refrigeration machine body 1. When the riser pipe 7 descends to the bottom, it will press the telescopic air intake frame 18. At this time, the top of the telescopic air intake frame 18 is pressed down to expose the air outlet hole two 37 at the top of the air intake pipe 33. Cold air enters the air intake pipe 33 through the branch pipe 20 and the shunt pipe 19, then enters the riser pipe 7 through the air outlet hole two 37, and finally is evenly output through the air outlet hole one 28 to perform freshness preservation treatment on the prefabricated dishes on the placement grid 9. At the same time, part of the cold air is output from the air outlet 2 and passes through the through holes from left to right through the outer cylinder 10 and the inner cylinder 11, driving the cold air circulation while performing cooling and freshness preservation. When the prefabricated dish placement structure is moved out, the inner cylinder 11 rotates forward, and also drives the driven gear 22 to rotate through the rack 21. The driven gear 22 is connected to the bevel gear at the top of the second bevel gear set 24, thereby driving the bevel gear at the bottom to rotate, and the bidirectional screw rod 23 rotates accordingly, driving the sliding pipes 26 on both sides to move. When the prefabricated dish placement structure is moved out, the air guide plate 3 structures on both sides of the mounting frame 4 rotate towards both sides of the refrigeration machine body 1 under the action of the rotating shafts of the support frame one 25 and the support frame two 27, thereby guiding the cold air to the space between the outer cylinder 10 and the refrigeration machine body 1 for cooling treatment. When the prefabricated dish is reset, the inner cylinder 11 rotates to coincide with the through hole of the outer cylinder 10. At this time, the air guide plate 3 adjusts its angle during the movement of the sliding pipe 26 and faces the position of the through hole of the outer cylinder 10 and the inner cylinder 11, and the cold air is accurately guided into the inner cylinder 11 for freshness preservation treatment of the prefabricated dishes. When the prefabricated dish placement structure is moved out, the through hole structures of the inner cylinder 11 and the outer cylinder 10 are staggered to prevent cold air from overflowing.

[0021] The bottom plate 29 at the bottom of the riser pipe 7 is slidably connected to the slide rail inside the inner cylinder 11 to ensure the stable lifting of the threaded pipe 30 and the riser pipe 7. The support plate 6, the top plate 8 and the bottom plate 29 are all adapted to the size of the inner cylinder 11, effectively preventing the overflow of cold air. Ventilation holes are provided on the placement grid 9, corresponding to the positions of the first air outlet holes 28 on the riser pipe 7 respectively, to ensure the uniform cooling and freshness-keeping treatment of cold air. There is a certain distance between the placement grid 9 and the support plate 6, so that cold air can also conduct freshness-keeping treatment on the prefabricated dishes from the bottom of the placement grid 9, and the cooling is more uniform. The rotating rod 15 can also drive the spiral blade 17 to rotate, further assisting the flow of cold air inside the refrigeration machine body 1 and assisting the freshness-keeping treatment of the prefabricated dishes. When the riser pipe 7 descends to the bottommost position, the limit plate 34 will directly enter the bottom of the riser pipe 7, and the top of the telescopic air inlet frame 18 is pressed down, and the air inlet pipe 33 is exposed from the second air outlet hole 37, and cold air enters the riser pipe 7. When the riser pipe 7 ascends, the top of the telescopic air inlet frame 18 is reset under the action of the return spring 36, thereby blocking the air inlet pipe 33 and the second air outlet hole 37 to prevent cold air from being output from the inside of the inner cylinder 11 to the outside of the refrigeration machine body 1.

[0022] The technical means disclosed in the solution of the present invention are not limited to the technical means disclosed by the above technical means, but also include the technical solutions composed of equivalent replacements of the above technical features. The matters not covered in the present invention belong to the common general knowledge of those skilled in the art.

Claims

1. A fresh-keeping device for prefabricated dishes, comprising a refrigerator body (1), wherein a support frame (14) is fixedly connected to the inner bottom wall of the refrigerator body (1), and it is characterized in that: It also includes; A freshness-keeping mechanism, the freshness-keeping mechanism includes outer cylinders (10) fixedly connected to both sides of the top of the support frame (14). An inner cylinder (11) is slidably connected to the inner wall of the outer cylinder (10). On the outer walls of both sides of the bottom end of the support frame (14), a first bevel gear set (16) is installed. A one-way screw rod (12) is fixedly connected to the inner wall of the top of the first bevel gear set (16). A threaded pipe (30) is threadedly connected to the outer wall of the one-way screw rod (12). A riser pipe (7) is fixedly connected to the outer wall of the threaded pipe (30). A plurality of support plates (6) are fixedly connected to the outer wall of the riser pipe (7). An annular groove is provided on the outer wall of the top end of the support plate (6). A placement wire rack (9) is slidably connected to the inner wall of the annular groove. On one side of the top and bottom of the outer cylinder (10), a fixed frame is fixedly connected. A driven gear (22) is rotatably arranged on the inner wall of the fixed frame. A second bevel gear set (24) is installed on the outer wall of the fixed frame. Mounting frames (4) are fixedly connected to the inner walls of both sides of the refrigerator body (1). On one side of the top and bottom of the mounting frame (4), a first bracket (25) is fixedly connected. A bidirectional screw rod (23) is fixedly connected to the inner wall of the bottom of the second bevel gear set (24). A plurality of sliding pipes (26) are threadedly connected to the outer walls of both sides of the bidirectional screw rod (23). A second bracket (27) is fixedly connected to the outer wall of the sliding pipe (26). A rotating shaft is rotatably arranged on the inner walls of the first bracket (25) and the second bracket (27). An expansion block is fixedly connected to the outer wall of the rotating shaft. One end of the expansion block is fixedly connected to a wind guiding plate (3).

2. The fresh-keeping device for prefabricated dishes according to claim 1, wherein: A motor (13) is installed on one side of the outer wall of the bottom of the refrigerator body (1). One end of the output shaft of the motor (13) is connected to a rotating rod (15) through a coupling. A bottom plate (29) is fixedly connected to the outer wall of the bottom of the riser pipe (7). The sliding pipes (26), the wind guiding plates (3) and the support plates (6) are arranged in a linear array. Through holes are provided on the outer walls of both sides of the outer cylinder (10) and the inner cylinder (11). Slide rails are provided on the inner walls of both sides of the inner cylinder (11). The bottom plate (29) is slidably connected to the inner wall of the slide rail. Rack teeth (21) are fixedly connected to the outer walls of the top and bottom of the inner cylinder (11). The rack teeth (21) are engaged with the driven gear (22). The position of the wind guiding plate (3) is adapted to that of the through hole. Chute grooves (31) are provided on the inner walls of both sides of the bottom of the outer cylinder (10). Slide blocks (32) are fixedly connected to the outer walls of both sides of the bottom of the inner cylinder (11). The slide blocks (32) are slidably connected to the inner wall of the chute groove (31).

3. The fresh-keeping device for prefabricated dishes according to claim 1, wherein: A plurality of first air outlet holes (28) are formed in the outer wall of the riser pipe (7), and the first air outlet holes (28) are distributed in an annular array. A plurality of ventilation holes are formed in the top outer wall of the placement wire rack (9). The positions of the first air outlet holes (28) are adapted to those of the ventilation holes. A top cover (5) is installed on the top outer wall of the refrigerator body (1). Inlets and outlets are formed in the outer walls on both sides of the top of the top cover (5). A top plate (8) is fixedly connected to the top outer wall of the riser pipe (7), and the size of the top plate (8) is adapted to that of the inlets and outlets.

4. A fresh-keeping device for prefabricated dishes according to any one of claims 1-3, characterized in that: A branch pipe (20) is arranged on the bottom inner wall of the refrigerator body (1). A flow dividing pipe (19) is fixedly connected to the inner walls on both sides of the support frame (14). A telescopic air inlet frame (18) is fixedly connected to the top outer wall of the flow dividing pipe (19). Circular holes are formed at the four corners of the top outer wall of the telescopic air inlet frame (18). An air inlet pipe (33) is inserted into the inner walls of the circular holes. Second air outlet holes (37) are formed in the outer walls on both sides of the top of the air inlet pipe (33). The air inlet pipe (33) and the branch pipe (20) communicate with the flow dividing pipe (19).

5. The fresh-keeping device for prefabricated dishes according to claim 4, characterized in that: A connection hole is formed in the top outer wall of the telescopic air inlet frame (18). A support rod (35) is slidably connected to the inner wall of the connection hole. A limiting projection is arranged on the bottom outer wall of the support rod (35). A limiting plate (34) is fixedly connected to the top outer wall of the support rod (35). The size of the limiting plate (34) is adapted to that of the circular hole. A return spring (36) is sleeved on the bottom outer wall of the support rod (35), and the two ends of the return spring (36) are fixedly connected to the outer walls of the telescopic air inlet frame (18) and the limiting projection respectively.

6. The fresh-keeping device for prefabricated dishes according to claim 5, characterized in that: The telescopic air inlet frame (18) is located directly below the riser pipe (7), and the size of the telescopic air inlet frame (18) is adapted to that of the riser pipe (7). An air outlet (2) is arranged on one inner wall of the refrigerator body (1). A return air outlet is arranged on one outer wall of the support frame (14). Engagement holes are formed in the outer walls on one side of the top and bottom of the outer cylinder (10). The sizes of the driven gear (22) and the rack (21) are adapted to those of the engagement holes.

7. The fresh-keeping device for prefabricated dishes according to claim 2, wherein: The rotating rod (15) is fixedly connected to the bottom inner wall of the first bevel gear set (16). A spiral blade (17) is fixedly connected to the outer wall of the rotating rod (15). The size of the spiral blade (17) is adapted to the distance between the support frame (14) and the refrigerator body (1).

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