A device for locking freshness of pre-prepared dishes

Abstract

The present invention relates to the technical field of fresh-keeping equipment, specifically a fresh-keeping equipment for pre-prepared meals, comprising a refrigerator body, wherein the bottom inner wall of the refrigerator body is fixedly connected to a support frame, and further comprising: a fresh-keeping mechanism, wherein the fresh-keeping mechanism comprises an outer cylinder fixedly connected to both sides of the top of the support frame, the inner wall of the outer cylinder is slidably connected to the inner cylinder, a motor is installed on one outer wall of the bottom side of the refrigerator body, and one end of the motor output shaft is connected to a rotating rod through a coupling; the rotation of the inner cylinder of the present invention also controls the diversion angle of the air guide plate through a rack transmission, and when the placement structure is moved out, the air guide plate guides the cold air to both sides of the outer cylinder, and when the placement structure is reset, the air guide plate guides the cold air to the through-hole position 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 fresh-keeping equipment for pre-prepared meals.

Description

Technical Field

[0001] The invention relates to the technical field of freshness-locking equipment, in particular to a freshness-locking equipment for pre-prepared dishes. Background Art

[0002] After packaging, pre-prepared meals need to be treated with fresh-keeping equipment to maintain the freshness and taste of the ingredients and extend their shelf life.

[0003] The pre-prepared food fresh-keeping equipment is used to freeze and lock the pre-prepared food. When the pre-prepared food is taken out after being locked and replaced with a new one, the door needs to be opened. Opening it directly will cause the cold air inside the fresh-keeping equipment to be lost. When the door is closed again, the refrigerator needs to work at high power to fill the fresh-keeping equipment with cold air again, which increases the energy consumption of the refrigeration storage equipment. Moreover, the internal cold air is not guided during the replacement of the pre-prepared food. The cold air is easy to overflow into the connection gap of the placement structure, resulting in the problem of local temperature being too high or too low, which affects the subsequent fresh-keeping treatment of the pre-prepared food. Summary of the Invention

[0004] The purpose of the present invention is to provide a device for locking the freshness of pre-prepared dishes to solve the problems raised in the above-mentioned background technology.

[0005] The technical solution of the present invention is: a fresh-keeping device for prepared dishes, comprising a refrigerator body, wherein the bottom inner wall of the refrigerator body is fixedly connected to a support frame, and further comprising:

[0006] The fresh-keeping mechanism comprises an outer cylinder fixedly connected to both sides of the top of the support frame, the inner wall of the outer cylinder is slidably connected to the inner cylinder, and the outer walls of both sides of the bottom end of the support frame are equipped with a bevel gear set 1, and the top inner wall of the bevel gear set 1 is fixedly connected to a one-way screw, and the outer wall of the one-way screw is connected to a threaded tube through a thread, and the outer wall of the threaded tube is fixedly connected to a vertical pipe, and the outer wall of the vertical pipe is fixedly connected to a number of support plates, and the top outer wall of the support plate is provided with an annular groove, and the inner wall of the annular groove is slidably connected to a placement grid, and the outer wall of one side of the top and bottom of the outer cylinder is fixedly connected to a fixing frame, and the inner wall of the fixing frame is rotatably provided with a driven gear, and the outer wall of the fixing frame is equipped with a bevel gear. Wheel group two, the inner walls on both sides of the refrigerator body are fixedly connected with mounting brackets, the outer walls on one side of the top and bottom of the mounting bracket are fixedly connected with bracket one, the bottom inner wall of the bevel gear group two is fixedly connected with a two-way screw, the outer walls on both sides of the two-way screw are connected with a number of sliding tubes by threads, the outer walls of the sliding tubes are fixedly connected with bracket two, the inner walls of the bracket one and the bracket two are rotatably provided with a rotating shaft, the outer wall of the rotating shaft is fixedly connected with a telescopic block, one end of the telescopic block is fixedly connected with an air guide plate, through holes are provided on the outer walls of the outer cylinder and the inner cylinder, when the placement grid is moved out, the through hole structures of the outer cylinder and the inner cylinder are staggered, and when the placement grid is reset, the inner cylinder rotates to coincide with the through hole of the outer cylinder.

[0007] Preferably, a motor is installed on one side outer wall of the bottom of the refrigerator body, one end of the motor output shaft is connected to a rotating rod through a coupling, the bottom outer wall of the vertical pipe is fixedly connected to the bottom plate, the sliding tube, air guide plate and support plate are distributed in a linear array, through holes are provided on both side outer walls of the outer cylinder and the inner cylinder, slide rails are provided on both side inner walls of the inner cylinder, the bottom plate is slidably connected to the inner wall of the slide rail, the top and bottom outer walls of the inner cylinder are fixedly connected with a rack, the rack is meshed with the driven gear, the air guide plate is adapted to the position of the through hole, slide grooves are provided on both side inner walls of the bottom of the outer cylinder, sliders are fixedly connected to both side outer walls of the bottom of the inner cylinder, and the sliders are slidably connected to the inner wall of the slide groove.

[0008] Preferably, the outer wall of the riser is provided with a plurality of air outlet holes 1, and the air outlet holes 1 are distributed in a circular array. The top outer wall of the grid is provided with a plurality of ventilation holes. The top outer wall of the refrigerator body is installed with a top cover, and the outer walls on both sides of the top of the top cover are provided with inlets and outlets. The top outer wall of the riser is fixedly connected with a top plate, and the top plate is adapted to the size of the inlet and outlet.

[0009] Preferably, a branch pipe is provided on the bottom inner wall of the refrigerator body, a diversion pipe is fixedly connected to the inner walls on both sides of the support frame, a telescopic air inlet frame is fixedly connected to the outer wall on the top end of the diversion pipe, circular holes are provided at the four corners of the outer wall on the top end of the telescopic air inlet frame, an air inlet pipe is inserted into the inner wall of the circular hole, two air outlet holes are provided on the outer walls on both sides of the top of the air inlet pipe, and the air inlet pipe and the branch pipe are connected to the diversion pipe.

[0010] Preferably, a connecting hole is provided on the top outer wall of the telescopic air inlet frame, and a support rod is slidably connected to the inner wall of the connecting hole. A limiting protrusion is provided on the bottom outer wall of the support rod, and the top outer wall of the support rod is fixedly connected to a limiting plate, and the limiting plate is adapted to the size of the circular hole. A reset spring is provided on the bottom outer wall of the support rod, and both ends of the reset spring are respectively fixedly connected to the telescopic air inlet frame and the outer wall of the limiting protrusion.

[0011] Preferably, the telescopic air inlet frame is located directly below the vertical pipe, the telescopic air inlet frame is adapted to the size of the vertical pipe, an air outlet is provided on one side inner wall of the refrigerator body, an air return port is provided on one side outer wall of the support frame, and engaging holes are provided on one side outer wall of the top and bottom of the outer cylinder, and the driven gear and rack are adapted to the size of the engaging holes.

[0012] Preferably, the rotating rod is fixedly connected to an inner wall of a bottom portion of the bevel gear set, and an outer wall of the rotating rod is fixedly connected with a spiral blade, the size of the spiral blade being adapted to the spacing between the support frame and the refrigerator body.

[0013] The present invention provides a device for locking the freshness of prepared dishes through improvement, which has the following improvements and advantages compared with the prior art:

[0014] Firstly, 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 interior 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 drops to the bottom. The air enters 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. 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 position 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-keeping equipment.

[0015] Secondly, the present invention is provided with a placement grid, a vertical pipe, a rotating rod and spiral blades, and ventilation holes are provided on the placement grid, which correspond to the positions of the air outlet holes on the vertical pipes respectively, to ensure uniform cooling and fresh-keeping treatment of the cold air. There is a certain distance between the placement 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 placement grid, and the cooling is more uniform. The rotating rod can also drive the spiral blades 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

[0016] The present invention will be further explained below in conjunction with the accompanying drawings and examples:

[0017] Figure 1 It is a schematic cross-sectional view of the overall structure of the present invention;

[0018] Figure 2 This is a structural schematic diagram of the pre-prepared dish removal state of the present invention;

[0019] Figure 3 This is a schematic diagram of the structure of the pre-prepared dish in the fresh-keeping state of the present invention;

[0020] Figure 4 is a top view of the air guide structure of the present invention;

[0021] Figure 5 This is an exploded schematic diagram of the grid connection structure of the present invention;

[0022] Figure 6 It is an exploded schematic diagram of the riser connection structure of the present invention;

[0023] Figure 7 This is an exploded schematic diagram of the outer cylinder and inner cylinder structure of the present invention;

[0024] Figure 8 It is a schematic cross-sectional view of the telescopic air inlet frame structure of the present invention;

[0025] Figure 9 It is an exploded schematic diagram of the telescopic air inlet frame structure of the present invention.

[0026] Description of reference numerals:

[0027] 1. Refrigeration unit body; 2. Air outlet; 3. Air guide plate; 4. Mounting frame; 5. Top cover; 6. Support plate; 7. Vertical pipe; 8. Top plate; 9. Placement grid; 10. Outer cylinder; 11. Inner cylinder; 12. One-way screw; 13. Motor; 14. Support frame; 15. Rotating rod; 16. Bevel gear set 1; 17. Spiral blade; 18. Telescopic air inlet frame; 19. Diverter pipe; 20. Branch pipe; 21. Rack; 22. Driven gear; 23. Two-way screw; 24. Bevel gear set 2; 25. Bracket 1; 26. Sliding pipe; 27. Bracket 2; 28. Air outlet 1; 29. ​​Bottom plate; 30. Threaded pipe; 31. Slide groove; 32. Slider; 33. Air inlet pipe; 34. Limit plate; 35. Support rod; 36. Return spring; 37. Air outlet 2. DETAILED DESCRIPTION

[0028] The present invention is described in detail below, clearly and completely describing the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0029] The present invention provides a device for locking the freshness of pre-prepared dishes through improvement. The technical solution of the present invention is:

[0030] like Figures 1-9 As shown, a device for pre-prepared food freshness preservation includes a refrigerator body 1, a support frame 14 is fixedly connected to the bottom inner wall of the refrigerator body 1, and further includes;

[0031] The fresh-keeping mechanism includes an outer cylinder 10 fixedly connected to both sides of the top of the support frame 14, the inner wall of the outer cylinder 10 is slidably connected to the inner cylinder 11, and the outer walls of both sides of the bottom end of the support frame 14 are installed with a bevel gear set 16, and the top inner wall of the bevel gear set 16 is fixedly connected to the one-way screw 12, and the outer wall of the one-way screw 12 is connected to the threaded tube 30 through a thread, and the outer wall of the threaded tube 30 is fixedly connected to the vertical pipe 7, and the outer wall of the vertical pipe 7 is fixedly connected to a number of support plates 6. The top outer wall of the support plate 6 is provided with an annular groove, and the inner wall of the annular groove is slidably connected to the placement grid 9. The outer wall of one side of the top and bottom of the outer cylinder 10 is fixedly connected to the fixing frame, and the inner wall of the fixing frame is rotatably provided with a driven gear 22, and the outer wall of the fixing frame is installed with a bevel gear set 2. 24. The inner walls on both sides of the refrigerator body 1 are fixedly connected with mounting brackets 4, and the outer walls on one side of the top and bottom of the mounting bracket 4 are fixedly connected with bracket one 25. The bottom inner wall of the bevel gear set two 24 is fixedly connected with a two-way screw 23. The outer walls on both sides of the two-way screw 23 are connected with a number of sliding tubes 26 by threads. The outer walls of the sliding tubes 26 are fixedly connected with bracket two 27. The inner walls of bracket one 25 and bracket two 27 are rotatably provided with a rotating shaft, and the outer wall of the rotating shaft is fixedly connected with a telescopic block, and one end of the telescopic block is fixedly connected with an air guide plate 3. Through holes are provided on the outer walls on both sides of the outer tube 10 and the inner tube 11. When the grid frame 9 is placed and moved out, the through hole structures of the outer tube 10 and the inner tube 11 are staggered. When the grid frame 9 is reset, the inner tube 11 rotates and coincides with the through hole of the outer tube 10.

[0032] Furthermore, a motor 13 is installed on the outer wall of one side of the bottom of the refrigerator body 1, and one end of the output shaft of the motor 13 is connected to the rotating rod 15 through a coupling. The bottom outer wall of the vertical pipe 7 is fixedly connected to the bottom plate 29, and the sliding tube 26, the air guide plate 3 and the support plate 6 are distributed 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, and 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 walls of the slide rails, and the top and bottom outer walls of the inner cylinder 11 are fixedly connected with a rack 21, which is engaged with the driven gear 22, and the air guide plate 3 is adapted to the position of the through hole. Slide grooves 31 are provided on the inner walls of both sides of the bottom of the outer cylinder 10, and sliders 32 are fixedly connected to the outer walls of the both sides of the bottom of the inner cylinder 11, and the sliders 32 are slidably connected to the inner walls of the slide grooves 31.

[0033] Furthermore, the outer wall of the riser 7 is provided with a plurality of air outlet holes 28, and the air outlet holes 28 are distributed in a circular array. The top outer wall of the grid 9 is provided with a plurality of ventilation holes. The top outer wall of the refrigerator body 1 is installed with a top cover 5, and the outer walls on both sides of the top of the top cover 5 are provided with an inlet and outlet. The top outer wall of the riser 7 is fixedly connected with a top plate 8, and the top plate 8 is adapted to the size of the inlet and outlet. The bottom inner wall of the refrigerator body 1 is provided with a branch pipe 20, and the inner walls on both sides of the support frame 14 are fixedly connected with a diversion pipe 19. The top outer wall of the diversion pipe 19 is fixedly connected with a telescopic air inlet frame 18. Circular holes are provided at the four corners of the top outer wall of the telescopic air inlet frame 18, and the inner wall of the circular hole is connected with an air inlet pipe 33. The outer walls on both sides of the top of the air inlet pipe 33 are provided with air outlet holes 237, and the air inlet pipe 33 and the branch pipe 20 are connected with the diversion pipe 19.

[0034] Furthermore, a connecting hole is provided on the top outer wall of the telescopic air inlet frame 18, and a support rod 35 is slidably connected to the inner wall of the connecting hole. A limiting protrusion is provided on the bottom outer wall of the support rod 35, and the top outer wall of the support rod 35 is fixedly connected to the limiting plate 34, and the limiting plate 34 is adapted to the size 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 respectively fixedly connected to the telescopic air inlet frame 18 and the outer wall of the limiting protrusion. The telescopic air inlet frame 18 is located directly below the vertical pipe 7, and the telescopic air inlet frame 18 is adapted to the size of the vertical pipe 7. An air outlet 2 is provided on one side inner wall of the refrigerator body 1, and a return air port is provided on one side outer wall of the support frame 14. The outer wall of one side of the top and bottom of the outer cylinder 10 is opened It is provided with an engaging hole, and the size of the driven gear 22 and the rack 21 are adapted to the engaging hole. The rotating rod 15 is fixedly connected to the inner wall of the bottom of the bevel gear set 16, and the outer wall of the rotating rod 15 is fixedly connected with a spiral leaf 17. The size of the spiral leaf 17 is adapted to the spacing between the support frame 14 and the refrigerator body 1. Ventilation holes are provided on the placement grid 9, which correspond to the positions of the air outlet holes 28 on the riser 7 respectively, to ensure uniform cooling and fresh-keeping 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 lock the freshness of the pre-prepared dishes from the bottom of the placement grid 9, and the cooling is more uniform. The rotating rod 15 can also drive the spiral leaf 17 to rotate, further assisting the flow of cold air inside the refrigerator body 1.

[0035] Working principle: In the process of locking the freshness of pre-prepared dishes, it is necessary to first move the pre-prepared dish placement structure inside the refrigerator body 1 to the outside of the refrigerator body 1, connect the refrigerator body 1 to the external power supply, and blow cold air into the interior through the refrigeration structure and the air outlet 2, start the motor 13, and rotate the rotating rod 15. The bevel gear set 16 and the 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 bevel gear set 16, and then drives the top bevel gear to rotate, thereby driving the one-way screw 12 to rotate. The one-way screw 12 is connected to the threaded tube 30 through a thread. At this time, the slider 32 on the inner cylinder 11 is located on one side of the inner groove 31 of the outer cylinder 10. The inner cylinder 11 is not limited and will be in the one-way screw 12. When the inner cylinder 11 is limited by the slider 32, the one-way screw 12 drives the threaded tube 30 to descend, and the support plate 6 and the placement rack 9 drive the pre-prepared dishes back to the inside of the refrigerator body 1. When the vertical tube 7 descends to the bottom, it will extend to the bottom of the refrigerator body 1. The wind frame 18 is retracted and pressed. At this time, the top of the telescopic air inlet frame 18 is pressed down to expose the second air outlet 37 on the top of the air inlet pipe 33. The cold air enters the air inlet pipe 33 through the branch pipe 20 and the diverter pipe 19, and then enters the vertical pipe 7 through the second air outlet 37. Finally, it is evenly output through the first air outlet 28 to lock the freshness of the pre-prepared dishes placed on the grid rack 9. At the same time, part of the cold air is output from the air outlet 2, passes through the outer cylinder 10 and the inner cylinder 11 through the through hole from left to right, and drives the cold air circulation while cooling and locking the freshness. When the pre-prepared 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 bevel gear set 24, thereby driving the bevel gear at the bottom to rotate. When the pre-prepared dish is placed, the bidirectional screw 23 rotates accordingly, thereby driving the sliding tubes 26 on both sides to move. When the pre-prepared dish placement structure is moved out, the air guide plate 3 structures on both sides of the mounting frame 4 rotate toward the two sides of the refrigerator body 1 under the action of the rotating shaft of the bracket 1 25 and the bracket 2 27, thereby guiding the cold air to the space between the outer cylinder 10 and the refrigerator body 1 for cooling treatment. When the pre-prepared 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 tube 26, toward the through-hole position of the outer cylinder 10 and the inner cylinder 11, and the cold air is accurately guided to the inside of the inner cylinder 11 for fresh-keeping treatment of the pre-prepared dish. When the pre-prepared 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.

[0036] The bottom plate 29 at the bottom of the vertical pipe 7 is slidably connected to the slide rail inside the inner tube 11 to ensure the stable lifting of the threaded tube 30 and the vertical pipe 7. The support plate 6, the top plate 8 and the bottom plate 29 are all adapted to the size of the inner tube 11 to effectively prevent the overflow of cold air. Ventilation holes are set on the placement grid 9, which correspond to the positions of the air outlet holes 28 on the vertical pipe 7 respectively, to ensure the uniform cooling and fresh-keeping 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 lock the freshness of the pre-prepared dishes from the bottom of the placement grid 9, and the cooling is more uniform. The rotating rod 15 also It can drive the spiral blades 17 to rotate, further assisting the flow of cold air inside the refrigerator body 1 and assisting in the freshness-locking process of pre-prepared dishes. When the vertical pipe 7 drops to the bottom, the limit plate 34 will directly enter the bottom of the vertical pipe 7, and the top of the telescopic air inlet frame 18 will be pressed down, and the air inlet pipe 33 will expose the second air outlet 37, and cold air will enter the vertical pipe 7. When the upper body of the vertical pipe 7 rises, the top of the telescopic air inlet frame 18 will be reset under the action of the reset spring 36, thereby blocking the air inlet pipe 33 and the second air outlet 37, and preventing cold air from being output from the inside of the inner tube 11 to the outside of the refrigerator body 1.

[0037] The technical means disclosed in the solution of the present invention are not limited to the technical means disclosed in the above technical means, but also include technical solutions composed of equivalent replacements of the above technical features. Matters not covered in the present invention belong to the common knowledge of those skilled in the art.

Claims

1. A device for pre-prepared food freshness preservation, comprising a refrigerator body (1), wherein the bottom inner wall of the refrigerator body (1) is fixedly connected to a support frame (14), characterized in that: Also includes; A fresh-keeping mechanism, comprising an outer cylinder (10) fixedly connected to both sides of the top of a support frame (14), the inner wall of the outer cylinder (10) being slidably connected to the inner cylinder (11), the outer walls of both sides of the bottom of the support frame (14) being installed with a bevel gear set (16), the top inner wall of the bevel gear set (16) being fixedly connected to a one-way screw (12), the outer wall of the one-way screw (12) being threadedly connected to a threaded tube (30), the outer wall of the threaded tube (30) being fixedly connected to a vertical tube (7), the outer wall of the vertical tube (7) being fixedly connected to a plurality of support plates (6), the top outer wall of the support plate (6) being provided with an annular groove, the inner wall of the annular groove being slidably connected to a placement grid (9), the outer walls of one side of the top and bottom of the outer cylinder (10) being fixedly connected to a fixing frame, the inner wall of the fixing frame being rotatably provided with a driven gear (22), the outer wall of the fixing frame being installed with a bevel gear set (24), The inner walls on both sides of the refrigerator body (1) are fixedly connected to mounting frames (4), the outer walls on one side of the top and bottom of the mounting frame (4) are fixedly connected to bracket one (25), the inner wall on the bottom of the bevel gear set two (24) is fixedly connected to a bidirectional screw (23), the outer walls on both sides of the bidirectional screw (23) are connected to a plurality of sliding tubes (26) by threads, the outer walls of the sliding tubes (26) are fixedly connected to bracket two (27), the inner walls of the bracket one (25) and the bracket two (27) are rotatably provided with a rotating shaft, the outer wall of the rotating shaft is fixedly connected to a telescopic block, one end of the telescopic block is fixedly connected to an air guide plate (3), the outer walls on both sides of the outer cylinder (10) and the inner cylinder (11) are provided with through holes, when the placement grid (9) is moved out, the through hole structures of the outer cylinder (10) and the inner cylinder (11) are staggered, when the placement grid (9) is reset, the inner cylinder (11) rotates to coincide with the through hole of the outer cylinder (10).

2. The freshness-locking device for pre-prepared food according to claim 1, characterized in that: A motor (13) is installed on one side outer wall of the bottom of the refrigerator body (1), and one end of the output shaft of the motor (13) is connected to a rotating rod (15) through a coupling. The bottom outer wall of the vertical pipe (7) is fixedly connected to a bottom plate (29). The sliding tube (26), the air guide plate (3) and the support plate (6) are distributed in a linear array. The inner walls on both sides of the inner cylinder (11) are provided with slide rails. The bottom plate (29) is slidably connected to the inner walls of the slide rails. The top and bottom outer walls of the inner cylinder (11) are fixedly connected to racks (21). The racks (21) are meshed with the driven gear (22). The air guide plate (3) is adapted to the position of the through hole. The inner walls on both sides of the bottom of the outer cylinder (10) are provided with slide grooves (31). The outer walls on both sides of the bottom of the inner cylinder (11) are fixedly connected to sliders (32). The sliders (32) are slidably connected to the inner walls of the slide grooves (31).

3. The freshness-locking device for pre-prepared food according to claim 1, characterized in that: The outer wall of the vertical pipe (7) is provided with a plurality of air outlet holes (28), and the air outlet holes (28) are distributed in a ring array. The top outer wall of the placement grid (9) is provided with a plurality of ventilation holes. The top outer wall of the refrigerator body (1) is provided with a top cover (5), and the outer walls on both sides of the top of the top cover (5) are provided with inlets and outlets. The top outer wall of the vertical pipe (7) is fixedly connected with a top plate (8), and the top plate (8) is adapted to the size of the inlet and outlet.

4. The freshness-locking device for pre-prepared food according to any one of claims 1 to 3, characterized in that: The bottom inner wall of the refrigerator body (1) is provided with a branch pipe (20), the inner walls on both sides of the support frame (14) are fixedly connected with a diversion pipe (19), the top outer wall of the diversion pipe (19) is fixedly connected with a telescopic air inlet frame (18), circular holes are provided 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 wall of the circular hole, and two air outlet holes (37) are provided on the outer walls on both sides of the top of the air inlet pipe (33), and the air inlet pipe (33) and the branch pipe (20) are connected to the diversion pipe (19).

5. The device for locking freshness of prepared food according to claim 4, characterized in that: The top outer wall of the telescopic air inlet frame (18) is provided with a connecting hole, the inner wall of the connecting hole is slidably connected to a support rod (35), the bottom outer wall of the support rod (35) is provided with a limiting protrusion, the top outer wall of the support rod (35) is fixedly connected to a limiting plate (34), the limiting plate (34) is adapted to the size of the circular hole, and the bottom outer wall of the support rod (35) is sleeved with a reset spring (36), and the two ends of the reset spring (36) are respectively fixedly connected to the telescopic air inlet frame (18) and the outer wall of the limiting protrusion.

6. The device for pre-prepared food preservation according to claim 5, characterized in that: The telescopic air inlet frame (18) is located directly below the vertical pipe (7), and the size of the telescopic air inlet frame (18) is adapted to that of the vertical pipe (7). An air outlet (2) is provided on one side inner wall of the refrigerator body (1), and an air return port is provided on one side outer wall of the support frame (14). Engaging holes are provided on one side outer wall of the top and bottom of the outer cylinder (10), and the sizes of the driven gear (22) and the rack (21) are adapted to that of the engaging holes.

7. The freshness-locking device for pre-prepared food according to claim 2, characterized in that: The rotating rod (15) is fixedly connected to the inner wall of the bottom of the bevel gear set (16), and the outer wall of the rotating rod (15) is fixedly connected with a spiral leaf (17), and the size of the spiral leaf (17) is adapted to the distance between the support frame (14) and the refrigerator body (1).

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