An oven with uniform temperature field

Abstract

The present invention relates to an oven with uniform temperature field, comprising an inner container, a hot air baffle plate is arranged on the back side of the inner container, the hot air baffle plate and the back plate of the inner container form a hot air chamber, a hot air blower is arranged in the hot air chamber, a back heating pipe is arranged on the outer periphery of the hot air blower, a slide groove is vertically opened on the back plate of the inner container, the motor shaft of the hot air blower is inserted in the slide groove, and also comprises a driving mechanism, a sliding mechanism for driving the hot air blower to slide up and down, and a lifting mechanism for driving the hot air baffle plate to lift up and down, the driving mechanism can drive the sliding mechanism and the lifting mechanism respectively to make the hot air blower and the hot air baffle plate move synchronously and make the motor shaft of the hot air blower move up and down along the slide groove. Compared with the prior art, the hot air blower and the hot air baffle plate in the present invention can be driven by the sliding mechanism and the lifting mechanism respectively to move up and down synchronously, thereby making the entire hot air chamber of the oven move up and down, thereby improving the uniformity of the temperature field between different layers of the entire inner container.

Description

Technical Field

[0001] The invention relates to the field of ovens, and in particular to an oven with a uniform temperature field. Background Art

[0002] The inner pot of the existing oven is generally provided with a hot air baffle, the center of which is provided with an air inlet, and the surrounding side is provided with an air outlet, and the hot air baffle and the back plate of the inner pot form a hot air chamber, the hot air chamber is provided with a hot air blower, and the outer periphery of the hot air blower is provided with a circular back heating pipe. In this way, the airflow in the inner pot enters the hot air chamber through the air inlet, and the airflow entering the hot air chamber is heated by the back heating pipe, and the heated hot air flow returns to the inner pot from the air outlet under the action of the hot air blower to heat the food.

[0003] The installation position of the hot air blower in the existing oven is fixed and unchanged, and the air inlet and outlet of the hot air baffle remain unchanged. Therefore, in the multi-layer baking mode or when baking foods such as egg tarts that require bottom and surface temperatures, the temperature difference between different layers of the baked food in the inner pot will be large, thus affecting the baking effect. Although the dual hot air blower oven adopts a dual hot air blower structure set up top and bottom, when the upper and lower hot air blowers are turned on separately, a large amount of hot air will first pass through the inner pot cavity area corresponding to the turned-on hot air blower, resulting in a low temperature field in other areas of the inner pot cavity. This has requirements on which layer to place the baked food, which is inconvenient for users to operate. In addition, when the upper and lower hot air blowers are turned on at the same time, the airflows of the two will interfere with each other, and the noise is relatively large during operation. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide an oven with a uniform temperature field and good temperature field uniformity in different layers of the inner cavity of an inner tank in view of the prior art.

[0005] The technical solution adopted by the present invention to solve the above-mentioned technical problems is: an oven with a uniform temperature field, comprising an inner tank, a hot air baffle is arranged on the back side of the inner tank, the hot air baffle and the back plate of the inner tank form a hot air chamber, a hot air blower is arranged in the hot air chamber, and a back heating pipe is arranged on the outer periphery of the hot air blower. It is characterized in that a slide groove is vertically opened on the back plate of the inner tank, and the motor shaft of the hot air blower is inserted into the slide groove. It also includes a driving mechanism, a sliding mechanism for driving the hot air blower to slide up and down, and a lifting mechanism for driving the hot air baffle to rise and fall. The driving mechanism can drive the sliding mechanism and the lifting mechanism respectively to make the hot air blower and the hot air baffle move synchronously and make the motor shaft of the hot air blower move up and down along the slide groove.

[0006] Furthermore, the driving mechanism is arranged on the back side of the inner tank, and includes a driving motor, a driving gear, a driven gear, a first transmission gear for linking with the above-mentioned sliding mechanism, and a main transmission shaft. The driving gear is fixed on the output shaft of the driving motor, and the main transmission shaft is arranged horizontally. The above-mentioned driven gear is fixed on the main transmission shaft and meshes with the above-mentioned driving gear, and the above-mentioned first transmission gear is respectively fixed on both sides of the main transmission shaft, and the two end portions of the main transmission shaft are respectively provided with transmission external threads for linking with the above-mentioned lifting mechanism.

[0007] Furthermore, the sliding mechanism includes a left guide rail, a right guide rail, a left rack and a right rack, wherein the left and right guide rails are respectively fixed vertically on the rear surface of the back plate of the inner tank, the left and right racks are respectively embedded in the left and right guide rails and can slide up and down along the left and right guide rails, respectively, the motor of the hot air blower is exposed on the back side of the inner tank and its two ends are respectively fixed on the left and right racks, and the left and right racks are respectively meshed with the corresponding first transmission gears. In this way, the driving motor rotates to drive the driving gear to rotate, and the driving gear drives the driven gear to rotate, thereby driving the main transmission shaft to rotate, and then drives the first transmission gears on both sides of the main transmission shaft to rotate, and the rotating first transmission gears respectively drive the left and right racks to move up and down along the left and right guide rails, thereby driving the hot air blower to move up and down along the slide slot.

[0008] Further, the lifting mechanism includes a left threaded transmission pair, a right threaded transmission pair, a left transmission bevel gear set, a right transmission bevel gear set, a left transmission shaft, a right transmission shaft, a left transmission gear and a right transmission gear. The left and right transmission gears are respectively arranged at the left and right ends of the back side of the inner tank and are respectively meshed with the transmission external threads at the two ends of the above-mentioned main transmission shaft. The left threaded transmission pair and the right threaded transmission pair are both arranged in the above-mentioned hot air chamber and are respectively located at the left and right ends of the hot air chamber, wherein the left threaded transmission pair includes a vertically arranged left screw and a left nut threadedly connected to the left screw, the left nut is fixed to the rear surface of the hot air baffle, and the left transmission bevel gear set includes a first left transmission bevel gear fixed to the lower end of the left screw and a left nut threadedly connected to the first left screw. The left transmission shaft is horizontally penetrated on the back plate of the inner tank along the front-to-back direction, and the front and rear ends of the left transmission shaft are respectively fixed with the second left transmission bevel gear and the left transmission gear, the right threaded transmission pair includes a vertically arranged right screw rod and a right nut threadedly connected to the right screw rod, and the right nut is fixed to the rear surface of the hot air baffle, the right transmission bevel gear group includes a first right transmission bevel gear fixed at the lower end of the right screw rod and a second right transmission bevel gear meshed with the first right transmission bevel gear, the right transmission shaft is horizontally penetrated on the back plate of the inner tank along the front-to-back direction, and the front and rear ends of the right transmission shaft are respectively fixed with the second right transmission bevel gear and the right transmission gear. In this way, the driving motor rotates to drive the driving gear to rotate, and the driving gear drives the driven gear to rotate, and then drives the main transmission shaft to rotate, and the rotating transmission external threads at both ends of the main transmission shaft respectively drive the corresponding left transmission gear or right transmission gear to rotate, and the rotating second transmission gears respectively drive the corresponding second transmission bevel gears to rotate, so that the corresponding lead screw rotates through the corresponding first transmission bevel gear, and then the nut corresponding to each lead screw moves up and down along the lead screw, and finally the hot air baffle moves up and down.

[0009] Furthermore, it also includes a sealing structure, which includes an upper and lower sealing frame located on the back side of the inner pot, the two ends of the upper and lower sealing frames are respectively fixed to the left and right racks, and the upper and lower sealing frames respectively include an upper and lower sealing plate, the upper and lower sealing plates are arranged opposite to each other, and the upper and lower notches are respectively opened on the opposite side edges of the two, the opposite side edges of the two are always against each other, and the upper and lower notches are combined into a circular through hole, the upper and lower sealing plates can always cover the above-mentioned slide groove, the diameter of the above-mentioned through hole is greater than or equal to the width of the above-mentioned slide groove, and the motor shaft of the above-mentioned hot air blower passes through the through hole. The upper and lower sealing plates cover the slide groove to achieve the sealing of the motor shaft of the hot air blower, so as to prevent the heat in the inner pot from leaking from the slide groove during the operation of the oven.

[0010] Furthermore, the upper and lower sealing frames further include upper and lower connecting plates, respectively, each of which is arranged transversely and fixed to the left and right racks at both ends, the upper sealing plate is fixed to the lower end of the upper connecting plate, and the lower sealing plate is fixed to the upper end of the lower connecting plate, so that the upper and lower sealing plates can better seal the motor shaft.

[0011] In order to better prevent the heat in the inner tank from leaking through the through hole, the sealing structure also includes a sealing ring, which is embedded in the above-mentioned through hole. The inner circumferential surface of the sealing ring is provided with flexible sealing sheets along the circumferential direction. The motor shaft of the above-mentioned hot air blower is passed through the sealing ring and each sealing sheet is always against the outer surface of the motor shaft.

[0012] Furthermore, the sealing structure further comprises a sealing sleeve, which comprises a cylindrical sleeve body, which is embedded in the through hole and closely attached to the outer peripheral surface of the sealing ring along the circumferential direction, and the front and rear edges of the sleeve body respectively extend outward along the circumferential direction to form a trumpet-shaped first sealing peripheral edge and a second sealing peripheral edge, the first sealing peripheral edge and the second sealing peripheral edge are both made of flexible materials, and the outer surface of the first sealing peripheral edge abuts against the front hole edge of the through hole, and the inner surface of the second sealing peripheral edge abuts against the rear hole edge of the through hole. This can further prevent the heat in the inner tank from leaking out through the through hole.

[0013] Furthermore, the slide groove is opened in the middle of the back plate along the height direction of the inner tank back plate, so that the hot air blower can better adjust the temperature field uniformity of different layers of the inner cavity of the entire inner tank when moving up and down along the slide groove.

[0014] Furthermore, the back heating pipe is annular in shape, and the above-mentioned slide groove is provided at the center of the horizontal projection of the back heating pipe on the back plate of the inner tank. In this way, when the hot air blower moves up and down, the back heating pipe can always heat the air around the hot air blower blades well, so that the hot air blower can better guide the hot air to the corresponding inner tank cavity area.

[0015] Compared with the prior art, the advantages of the present invention are: the hot air blower and the hot air baffle in the present invention can move up and down synchronously driven by the sliding mechanism and the lifting mechanism respectively, so that the entire hot air chamber of the oven moves up and down, thereby improving the uniformity of the temperature field between different layers of the entire inner pot. Specifically, when the temperature of the upper half of the inner pot cavity is low, the hot air blower and the hot air baffle move upward synchronously, the air intake and air outlet of the upper half of the inner pot cavity area corresponding to the hot air blower and the hot air baffle increase, and the temperature of the upper half area rises, thereby improving the uniformity of the temperature field of different layers of the entire inner pot cavity; when the temperature of the lower half of the inner pot cavity is low, the hot air blower and the hot air baffle move downward, the air intake and air outlet of the lower half of the inner pot cavity area corresponding to the hot air blower and the hot air baffle increase, and the temperature of the lower half area rises, thereby improving the uniformity of the temperature field of different layers of the entire inner pot cavity. Compared with the up and down movement of a single hot air blower or hot air baffle, the present invention moves the entire hot air chamber up and down by synchronously moving the hot air blower and the hot air baffle, so that the air in the hot air chamber can be evenly heated, and the hot air blown out of the hot air chamber has a uniform heat, which further promotes the uniformity of the temperature field between different layers of the inner pot. In addition, the present invention can improve the uniformity of the temperature field of different layers of the inner cavity of the entire inner pot with only one hot air blower, which can effectively reduce the production cost and the noise of the oven when it is working compared with the existing double hot air blower oven. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a structural schematic diagram of an oven in an embodiment of the present invention;

[0017] Figure 2 is a cross-sectional view of an oven according to an embodiment of the present invention;

[0018] Figure 3 is a schematic diagram of a partial structure of an oven in an embodiment of the present invention;

[0019] Figure 4 is another partial structural schematic diagram of an oven in an embodiment of the present invention;

[0020] Figure 5 for Figure 4 A magnified view of part A;

[0021] Figure 6 It is a partial structural exploded view of an oven in an embodiment of the present invention;

[0022] Figure 7 for Figure 6 Schematic diagram of the structure in another direction. DETAILED DESCRIPTION

[0023] The present invention is further described in detail below with reference to the accompanying drawings.

[0024] like Figures 1 to 7As shown, an oven with uniform temperature field includes an inner pot 1, a hot air baffle 2 is arranged on the back side of the inner pot 1, and the hot air baffle 2 and the back plate of the inner pot 1 form a hot air chamber 20, a hot air blower 3 is arranged in the hot air chamber 20, and a back heating pipe 4 is arranged around the outer periphery of the hot air blower 3. In this embodiment, the back heating pipe 4 is in a circular ring shape. A square slide 11 is vertically opened on the back plate of the inner pot 1, and the motor shaft 31 of the hot air blower 3 is inserted in the slide 11. Further, a driving mechanism 5, a sliding mechanism 6 for driving the hot air blower 3 to slide up and down, and a lifting mechanism 7 for driving the hot air baffle 2 to lift up and down, the driving mechanism 5 can respectively drive the sliding mechanism 6 and the lifting mechanism 7 to make the hot air blower 3 and the hot air baffle 2 move synchronously and make the motor shaft 31 of the hot air blower 3 move up and down along the slide 11.

[0025] In this way, the hot air blower 3 and the hot air baffle 2 in the present invention can move up and down synchronously under the drive of the sliding mechanism 6 and the lifting mechanism 7 respectively, so that the entire hot air chamber 20 of the oven moves up and down, thereby improving the uniformity of the temperature field between different layers of the entire inner pot 1. Specifically, when the temperature of the upper half of the inner cavity of the inner pot 1 is low, the hot air blower 3 and the hot air baffle 2 move upward synchronously, and the air intake and air outlet of the upper half of the inner cavity of the inner pot 1 corresponding to the hot air blower 3 and the hot air baffle 2 increase, and the temperature of the upper half area rises, thereby improving the uniformity of the temperature field of different layers of the inner cavity of the entire inner pot 1; when the temperature of the lower half of the inner cavity of the inner pot 1 is low, the hot air blower 3 and the hot air baffle 2 move downward synchronously, and the air intake and air outlet of the lower half of the inner cavity of the inner pot 1 corresponding to the hot air blower 3 and the hot air baffle 2 increase, and the temperature of the lower half area rises, thereby improving the uniformity of the temperature field of different layers of the inner cavity of the entire inner pot 1. Compared with the up and down movement of a single hot air blower 3 or hot air baffle 2, the present invention moves the entire hot air chamber 20 up and down by synchronously moving the hot air blower 3 and the hot air baffle 2 up and down, so that the air in the hot air chamber 20 can be evenly heated, and the hot air blown out of the hot air chamber 20 has uniform heat, which further improves the uniformity of the temperature field between different layers of the inner pot 1. In addition, the present invention can improve the uniformity of the temperature field of different layers of the inner cavity of the entire inner pot 1 by using only one hot air blower 3, which can effectively reduce the noise during operation compared with the existing double hot air blower oven.

[0026] Furthermore, the driving mechanism 5 is arranged on the back side of the inner tank 1, and the driving mechanism 5 includes a driving motor 51, a driving gear 52, a driven gear 53, a first transmission gear 54 and a main transmission shaft 55. The driving gear 52 is fixed on the output shaft of the driving motor 51, and the main transmission shaft 55 is arranged horizontally. The driven gear 53 is fixed on the main transmission shaft 55 and meshes with the driving gear 52, and the first transmission gear 54 is fixed on both sides of the main transmission shaft 55, and transmission external threads 551 are respectively provided at both ends of the main transmission shaft 55. The sliding mechanism 6 comprises a left guide rail 61, a right guide rail 62, a left rack 63 and a right rack 64, wherein the left and right guide rails 61, 62 are respectively vertically fixed on the rear surface of the back plate of the inner tank 1, the left and right racks 63, 64 are respectively embedded in the left and right guide rails 61, 62 and can slide up and down along the left and right guide rails 61, 62 respectively, the motor of the hot air blower 3 is exposed on the back side of the inner tank 1 and its two ends are respectively fixed on the left and right racks 63, 64, and the left and right racks 63, 64 are respectively meshed with the corresponding first transmission gear 54. The lifting mechanism 7 comprises a left thread transmission pair 71, a right thread transmission pair 72, a left transmission bevel gear set 73, a right transmission bevel gear set 74, a left transmission shaft 75, a right transmission shaft 76, a left transmission gear 77 and a right transmission gear 78. The left and right transmission gears 77 and 78 are respectively arranged at the left and right ends of the back side of the inner tank 1 and are respectively meshed with the transmission external threads 551 at both ends of the main transmission shaft 55. The left thread transmission pair 71 and the right thread transmission pair 72 are both arranged in the hot air chamber 20 and are respectively located at the left and right ends of the hot air chamber 20, wherein the left thread transmission pair 71 comprises a left screw rod 711 arranged vertically and a left nut 712 threadedly connected to the left screw rod 711, and the left nut 712 is fixed to the rear surface of the hot air baffle 2, and the left transmission bevel gear set 73 comprises a first left transmission bevel gear 731 fixed to the lower end of the left screw rod 711 and a left nut 712 threadedly connected to the left screw rod 711. The left nut 712 is fixed to the rear surface of the hot air baffle 2. The left transmission shaft 75 is horizontally penetrated on the back plate of the inner tank 1 along the front-to-back direction, and the front and rear ends of the left transmission shaft 75 are respectively fixed with the second left transmission bevel gear 732 and the left transmission gear 77, the right threaded transmission pair 72 includes a vertically arranged right screw rod 721 and a right nut 722 threadedly connected to the right screw rod 721, and the right nut 722 is fixed to the rear surface of the hot air baffle 2, the right transmission bevel gear set 74 includes a first right transmission bevel gear 741 fixed to the lower end of the right screw rod 721 and a second right transmission bevel gear 742 meshed with the first right transmission bevel gear 741, the right transmission shaft 76 is horizontally penetrated on the back plate of the inner tank 1 along the front-to-back direction, and the front and rear ends of the right transmission shaft 76 are respectively fixed with the second right transmission bevel gear 742 and the right transmission gear 78.

[0027] In this way, the driving motor 51 rotates to drive the driving gear 52 to rotate, and the driving gear 52 drives the driven gear 53 to rotate, thereby driving the main transmission shaft 55 to rotate, and then driving the first transmission gears 54 on both sides of the main transmission shaft 55 to rotate, and the rotating first transmission gears 54 respectively drive the left and right racks 63, 64 to move up and down along the left and right guide rails 61, 62, thereby driving the hot air blower 3 to move up and down along the slide 11. At the same time, the rotating transmission external threads 551 at both ends of the main transmission shaft 55 respectively drive the corresponding left transmission gear 77 or right transmission gear 78 to rotate, and the rotating left transmission gear 77 or right transmission gear 78 respectively drives the corresponding second transmission bevel gear to rotate, so that the corresponding first transmission bevel gear makes the corresponding screw rod rotate, and then the nut corresponding to each screw rod moves up and down along the screw rod, and finally the hot air baffle 2 moves up and down, that is, the hot air blower 3 and the hot air baffle 2 move up and down synchronously, and then the hot air chamber 20 of the oven moves up and down.

[0028] In this embodiment, a slide groove 11 for the motor shaft 31 of the heating fan 3 to move up and down is provided on the back plate of the inner tank 1. The opening of the slide groove 11 will cause the hot air in the hot air chamber 20 to leak out through the slide groove 11, thereby causing heat loss of the inner tank 1. Therefore, the oven in this embodiment also includes a sealing structure 8, which includes upper and lower sealing frames 81, 82 located on the back side of the inner pot 1, and the two ends of the upper and lower sealing frames 81, 82 are respectively fixed to the left and right racks 63, 64, and the upper and lower sealing frames 81, 82 respectively include upper and lower sealing plates 811, 821, and the upper and lower sealing plates 811, 821 are arranged opposite to each other up and down, and upper and lower notches are respectively opened on the opposite side edges of the two. The opposite side edges of the two are always against each other and the upper and lower notches are combined into a circular through hole 85. The upper and lower sealing plates 811, 821 can always cover the above-mentioned slide groove 11, and the diameter of the above-mentioned through hole 85 is greater than or equal to the width of the above-mentioned slide groove 11. The motor shaft 31 of the above-mentioned hot air blower 3 passes through the through hole 85. The upper and lower sealing plates 811 and 821 shield the chute 11 to seal the motor shaft 31 of the hot air blower 3, thereby preventing the heat in the inner pot 1 from leaking out from the chute 11 during the operation of the oven. In addition, in order to enable the upper and lower sealing plates 811 and 821 to better seal the motor shaft 31, the upper and lower sealing frames 81 and 82 further include upper and lower connecting plates 812 and 822, respectively. Each of the upper and lower connecting plates 812 and 822 is transversely arranged and its two ends are respectively fixed to the left and right racks 63 and 64. The upper sealing plate 811 is fixed to the lower end of the upper connecting plate 812, and the lower sealing plate 821 is fixed to the upper end of the lower connecting plate 822. Meanwhile, in this embodiment, the motor 32 of the hot air blower 3 is fixed to the left and right racks 63, 64 through the motor bracket 9, the motor bracket 9 is annular in shape, the motor 32 of the hot air blower 3 is fixed in the central hole of the motor bracket 9, and the left and right ends of the motor bracket 9 are respectively fixed to the left and right racks 63, 64. Further, the sealing structure 8 also includes a sealing ring 83, which is embedded in the through hole 85, and the inner circumferential surface of the sealing ring 83 is provided with flexible sealing sheets 831 along the circumferential direction, the motor shaft 31 of the hot air blower 3 is passed through the sealing ring 83 and each sealing sheet 831 is always against the outer surface of the motor shaft 31, so as to better prevent the heat in the inner pot 1 from leaking out through the through hole 85. Further, preferably, the sealing structure 8 also includes a sealing sleeve 84, which includes a cylindrical sleeve body 840, which is embedded in the above-mentioned through hole 85 and tightly attached to the outer peripheral surface of the above-mentioned sealing ring 83 along the circumferential direction, and the front and rear edges of the sleeve body 840 extend outward along the circumferential direction to form a first sealing edge 841 and a second sealing edge 842 in the shape of a trumpet, and the first sealing edge 841 and the second sealing edge 842 are both made of flexible material, and the outer surface of the first sealing edge 841 is against the front hole edge of the through hole 85, and the inner surface of the second sealing edge 842 is against the rear hole edge of the through hole 85.This can further prevent the heat in the inner container 1 from leaking out through the through hole 85 .

[0029] In addition, in this embodiment, the above-mentioned chute 11 is opened in the middle along the height direction of the back plate of the inner liner 1, so that the hot air blower 3 can better adjust the temperature field uniformity of different layers of the entire inner cavity of the inner liner 1 when moving up and down along the chute 11. Further, the outer shape of the back heating pipe 4 is annular, and the above-mentioned chute 11 is opened at the center of the horizontal projection of the back heating pipe 4 on the back plate of the inner liner 1. In this way, during the up and down movement of the hot air blower 3, the back heating pipe 4 can always heat the air around the fan blades of the hot air blower 3 well, so that the hot air blower 3 can better guide the hot air to its corresponding inner cavity area of ​​the inner liner 1.

Claims

1. An oven with uniform temperature field, comprising an inner container (1), a hot air baffle (2) being arranged on the back side of the inner container (1), the hot air baffle (2) and the back plate of the inner container (1) forming a hot air chamber (20), a hot air blower (3) being arranged in the hot air chamber (20), a back heating pipe (4) being arranged around the outer periphery of the hot air blower (3), characterized in that: A slide groove (11) is vertically provided on the back plate of the inner tank (1), and the motor shaft (31) of the hot air blower (3) is inserted into the slide groove (11). The inner tank (1) further comprises a driving mechanism (5), a sliding mechanism (6) for driving the hot air blower (3) to slide up and down, and a lifting mechanism (7) for driving the hot air baffle (2) to lift up and down. The driving mechanism (5) can drive the sliding mechanism (6) and the lifting mechanism (7) respectively to make the hot air blower (3) and the hot air baffle (2) move synchronously and make the motor shaft (31) of the hot air blower (3) move up and down along the slide groove (11); The driving mechanism (5) is arranged on the back side of the inner container (1), and comprises a driving motor (51), a driving gear (52), a driven gear (53), a first transmission gear (54) for interlocking with the sliding mechanism (6), and a main transmission shaft (55), wherein the driving gear (52) is fixed on the output shaft of the driving motor (51), the main transmission shaft (55) is arranged transversely, the driven gear (53) is fixed on the main transmission shaft (55) and meshes with the driving gear (52), and the first transmission gear (54) is fixed on both sides of the main transmission shaft (55), and the two end portions of the main transmission shaft (55) are respectively provided with transmission external threads (551) for interlocking with the lifting mechanism (7); The sliding mechanism (6) comprises a left guide rail (61), a right guide rail (62), a left rack (63) and a right rack (64), wherein the left and right guide rails (61, 62) are respectively vertically fixed on the rear surface of the back plate of the inner tank (1), the left and right racks (63, 64) are respectively embedded in the left and right guide rails (61, 62) and can slide up and down along the left and right guide rails (61, 62), the motor of the hot air blower (3) is exposed on the back side of the inner tank (1) and its two ends are respectively fixed on the left and right racks (63, 64), and the left and right racks (63, 64) are respectively meshed with the corresponding first transmission gear (54); The lifting mechanism (7) comprises a left thread transmission pair (71), a right thread transmission pair (72), a left transmission bevel gear set (73), a right transmission bevel gear set (74), a left transmission shaft (75), a right transmission shaft (76), a left transmission gear (77) and a right transmission gear (78); the left and right transmission gears (77, 78) are respectively arranged at the left and right ends of the back side of the inner container (1) and are respectively meshed with the transmission external threads (551) at the two ends of the main transmission shaft (55); the left thread transmission pair (71) and the right thread transmission pair (72) are both arranged in the hot air chamber (20) and are respectively located at the left and right ends of the hot air chamber (20); The left threaded transmission pair (71) comprises a left screw (711) arranged vertically and a left nut (712) threadedly connected to the left screw (711); the left nut (712) is fixed to the rear surface of the hot air baffle (2); the left transmission bevel gear set (73) comprises a first left transmission bevel gear (731) fixed to the lower end of the left screw (711) and a second left transmission bevel gear (732) meshing with the first left transmission bevel gear (731); the left transmission shaft (75) is horizontally penetrated on the back plate of the inner tank (1) along the front-to-back direction; and the second left transmission bevel gear (732) and the left transmission gear (77) are respectively fixed to the front and rear ends of the left transmission shaft (75); The right threaded transmission pair (72) comprises a right screw rod (721) arranged vertically and a right nut (722) threadedly connected to the right screw rod (721); the right nut (722) is fixed to the rear surface of the hot air baffle (2); the right transmission bevel gear set (74) comprises a first right transmission bevel gear (741) fixed to the lower end of the right screw rod (721) and a second right transmission bevel gear (742) meshed with the first right transmission bevel gear (741); the right transmission shaft (76) is horizontally penetrated on the back plate of the inner tank (1) along the front-to-back direction; and the second right transmission bevel gear (742) and the right transmission gear (78) are respectively fixed to the front and rear ends of the right transmission shaft (76).

2. The oven according to claim 1, characterized in that: The invention also comprises a sealing structure (8), wherein the sealing structure (8) comprises an upper sealing frame (81, 82) located on the back side of the inner container (1), the two ends of the upper sealing frame (81, 82) are respectively fixed to the left and right racks (63, 64), and the upper sealing frame (81, 82) comprises an upper sealing plate (811, 821), respectively, the upper sealing plate (811, 821) are arranged opposite to each other up and down, and upper and lower notches are respectively provided on the opposite side edges of the upper and lower sealing plates, the opposite side edges of the upper and lower sealing plates always abut against each other, and the upper and lower notches are combined to form a circular through hole (85), the upper and lower sealing plates (811, 821) can always cover the above-mentioned slide groove (11), the diameter of the above-mentioned through hole (85) is greater than or equal to the width of the above-mentioned slide groove (11), and the motor shaft (31) of the above-mentioned hot air blower (3) passes through the through hole (85).

3. The oven according to claim 2, characterized in that: The upper and lower sealing frames (81, 82) further include upper and lower connecting plates (812, 822), respectively. Each of the upper and lower connecting plates (812, 822) is arranged transversely and has two ends respectively fixed to the left and right racks (63, 64). The upper sealing plate (811) is fixed to the lower end of the upper connecting plate (812), and the lower sealing plate (821) is fixed to the upper end of the lower connecting plate (822).

4. The oven according to claim 2, characterized in that: The sealing structure (8) further comprises a sealing ring (83), which is embedded in the through hole (85), and the inner circumferential surface of the sealing ring (83) is provided with flexible sealing sheets (831) along the circumferential direction, and the motor shaft (31) of the hot air blower (3) is passed through the sealing ring (83) and each sealing sheet (831) always abuts against the outer surface of the motor shaft (31).

5. The oven according to claim 4, characterized in that The sealing structure (8) also includes a sealing sleeve (84), which includes a cylindrical sleeve body (840). The sleeve body (840) is embedded in the above-mentioned through hole (85) and is tightly attached to the outer peripheral surface of the above-mentioned sealing ring (83) along the circumferential direction, and the front and rear edges of the sleeve body (840) extend outward along the circumferential direction to form a first sealing edge (841) and a second sealing edge (842) in the shape of a trumpet. The first sealing edge (841) and the second sealing edge (842) are both made of flexible material, and the outer surface of the first sealing edge (841) is against the front hole edge of the through hole (85), while the inner surface of the second sealing edge (842) is against the rear hole edge of the through hole (85).

6. The oven according to any one of claims 1 to 5, characterized in that: The slide groove (11) is opened in the middle of the back plate along the height direction of the back plate of the inner container (1).

7. The oven according to claim 6, characterized in that The back heating tube (4) has a circular ring shape, and the slide groove (11) is arranged at the center of the horizontal projection of the back heating tube (4) on the back plate of the inner tank (1).

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