Bottle sterilizer

Abstract

The present invention relates to a bottle sterilizer, which comprises an outer shell and a cover, wherein an inner liner is arranged in the outer shell, the top of the inner liner is open and leads to the top of the outer shell, the cover covers the top of the inner liner, and further comprises a water storage tank, a steam generating device and a warm air drying device, wherein the steam generating device comprises an electromagnetic pump, a steam heater and a steam nozzle, the water storage tank is connected with the steam nozzle through the electromagnetic pump and the steam heater, and the steam nozzle is connected with the inside of the inner liner; the warm air drying device is provided with an air inlet and an air outlet, the air inlet is connected with the outside through the outer shell, the air outlet is connected with the inner liner, and the outer shell and / or the cover are provided with an exhaust groove. This bottle sterilizer has a water storage tank for storing water, the water in the water storage tank is quantitatively supplied to the steam heater through the electromagnetic pump, and the steam generated by the steam heater is sprayed into the inner liner through the steam nozzle to achieve steam sterilization.

Description

Technical Field

[0001] The invention relates to a milk bottle sterilizer. Background Art

[0002] The current milk bottle sterilizer includes a machine base, a barrel body and a cover body. The machine base is provided with a boiling water tank, a heater is provided next to the boiling water tank, a vent is provided at the bottom of the barrel body and is placed on the machine base, the boiling water tank is connected to the inside of the barrel body, and the cover body is arranged on the barrel body. When sterilizing milk bottles, a certain amount of water is poured into the boiling water tank, and the milk bottles are opened and inverted in the barrel body, the barrel body is placed on the machine base, the cover body is covered, and the boiling water tank is started. When the water in the boiling water tank boils, steam is generated, and the steam enters the milk bottles, that is, high-temperature sterilization is achieved. After the sterilization is completed, the heater is started to perform a drying operation. The milk bottle sterilizer of this structure needs to be added with water each time it is used, and the air pressure of the steam generated by boiling the water in the boiling water tank is low, so the steam temperature is not high enough and the sterilization effect is poor. In addition, the boiling water tank needs to boil all the water in it before steam is generated, so it takes a long time for steam to be generated. Summary of the invention

[0003] The object of the present invention is to provide a milk bottle sterilizer which has a reasonable structure, automatically adds water and quickly generates steam.

[0004] The object of the present invention is achieved in that:

[0005] A bottle sterilizer includes an outer shell and a cover. An inner liner is arranged in the outer shell. The top of the inner liner is open and leads to the top of the outer shell. The cover covers the top of the inner liner. The invention is characterized in that it also includes a water storage tank, a steam generating device and a warm air drying device. The steam generating device includes an electromagnetic pump, a steam heater and a steam nozzle. The water storage tank is connected to the steam nozzle through the electromagnetic pump and the steam heater. The steam nozzle is connected to the inside of the inner liner. The warm air drying device is provided with an air inlet and an air outlet. The air inlet is connected to the outside through the outer shell. The air outlet is connected to the inner liner. The outer shell and / or the cover are provided with an exhaust groove. The steam heater is an existing product. The steam generated by the steam heater has a certain pressure and is output to the outside of the steam heater in the form of a spray. The steam temperature is higher than the steam temperature generated by ordinary water boiling, and the sterilization effect is better.

[0006] The purpose of the present invention can also be solved by the following technical measures:

[0007] As a more specific solution, the steam nozzle is arranged at the inner bottom of the inner container, and a shelf is arranged in the inner container above the steam nozzle. During sterilization, the baby bottle can be inverted on the shelf to facilitate high-temperature steam to enter the baby bottle, and condensed water formed after the steam contacts the baby bottle automatically flows downward to avoid water accumulation.

[0008] As a further solution, the surface of the shelf is provided with a sparse mesh surface and a dense mesh surface, and the dense mesh surface is directly opposite to the steam nozzle. The sparse mesh surface is conducive to the steam entering the milk bottle, and the dense mesh surface is conducive to spreading the steam to a larger area.

[0009] As a further solution, the bottom of the inner container is also provided with an ultraviolet lamp, and / or an ozone generator, and the ozone release port of the ozone generator is connected to the inner part of the inner container. The ultraviolet lamp can irradiate upward to find the inside of the bottle, achieving more targeted sterilization.

[0010] As a further solution, the ultraviolet lamp is provided with a waterproof lampshade, which includes an upper cover ring, a light-transmitting sheet and a lower pressure cover. A lamp hole is provided at the bottom of the inner tank. The light-transmitting sheet covers the inner ring hole of the upper cover ring, and a first sealing ring is provided between the light-transmitting sheet and the bottom surface of the upper cover ring. The upper cover ring is arranged on the top surface of the lamp hole, and a second sealing ring is provided between the upper cover ring and the top surface of the lamp hole. The lower pressure cover is arranged on the bottom surface of the lamp hole and connected to the upper cover ring. The light-transmitting sheet and the first sealing ring are crimped between the upper cover ring and the lower pressure cover.

[0011] As a further solution, the water tank is arranged in the outer shell and is located beside the inner tank. The top of the water tank is open and leads to the top of the outer shell. A water tank cover is provided on the top of the water tank. A water level detection probe is provided in the water tank.

[0012] As a further solution, the cover covers the top of the inner container and the water tank at the same time, and the cover is hinged to the outer shell through a damping shaft. The cover rotates slowly when it is flipped down and closed, so as to avoid strong impact caused by rapid closing, which may easily cause the sterilizer to vibrate and the milk bottle to be sterilized to tilt. The top of the water tank is provided with a water tank cover and covered by the cover, which can reduce the risk of water pollution in the water tank.

[0013] As a further solution, the steam generating device also includes a support box, the electromagnetic pump and the steam heater are arranged in the support box, a partition is provided in the support box corresponding to the electromagnetic pump and the steam heater, the support box is connected to the bottom of the inner tank, a first groove is provided on the surface of the support box corresponding to the steam heater, a first pressure block is provided on the first groove, a first fuse is provided in the first groove, and the first pressure block presses the first fuse against the surface of the steam heater.

[0014] As a further solution, the warm air drying device includes a fan, an air duct and a heating element, the two ends of the air duct are respectively an air inlet and the air outlet, the heating element is arranged in the air duct, an air inlet is provided at the lower part of the inner tank, the air inlet is connected with the air outlet, the fan includes a volute, a motor and a wind wheel, the wind wheel is arranged in the volute and is transmission-connected to the motor, the volute is provided with an air outlet and the air inlet, and the air outlet is connected with the air inlet of the air duct.

[0015] As a further solution, the outer shell includes a cover frame, an outer cover and a bottom cover, the cover frame is provided with openings corresponding to the tops of the inner liner and the water tank, the tops of the inner liner and the water tank are connected to the cover frame, the outer cover is arranged between the cover frame and the bottom cover, the bottoms of the inner liner and the water tank are respectively provided with inner liner supporting feet and water tank supporting feet, and the lower ends of the inner liner supporting feet and the water tank supporting feet are respectively connected to the bottom cover; the surface cover includes a bottom frame and a transparent plate, the transparent plate is connected to the top surface of the bottom frame, and the outer cover is separated from the inner liner to form an insulation layer.

[0016] The beneficial effects of the present invention are as follows:

[0017] (1) This bottle sterilizer has a water storage tank for storing water. The water in the water storage tank is quantitatively supplied to the steam heater through an electromagnetic pump. The steam generated by the steam heater is sprayed into the inner tank through a steam nozzle to achieve steam sterilization;

[0018] (2) The steam nozzle of this bottle sterilizer is set at the bottom of the inner tank. When sterilizing, the bottle can be inverted on the shelf to facilitate the high-temperature steam to enter the bottle. At the same time, the condensed water formed after the steam contacts the bottle will automatically flow downward to avoid water accumulation;

[0019] (3) This bottle sterilizer generates steam through the cooperation of the steam heater and the electromagnetic pump. Since the electromagnetic pump can control the amount of water entering the steam heater, the steam heater can produce steam instantly;

[0020] (4) This bottle sterilizer is also equipped with ultraviolet light and / or ozone sterilization function to sterilize the inner liner, making the bottle more hygienic. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the structure of the present invention after the cover is opened.

[0022] Figure 2 It is a schematic diagram of the structure of the present invention after the cover is closed.

[0023] Figure 3 for Figure 2 Schematic diagram of the structure from another angle.

[0024] Figure 4 It is a schematic diagram of the decomposition structure of the present invention.

[0025] Figure 5 for Figure 4 Schematic diagram of the structure from another angle.

[0026] Figure 6 It is a schematic diagram of the exploded structure of the steam generating device in the present invention.

[0027] Figure 7 for Figure 6 Schematic diagram of the structure from another angle.

[0028] Figure 8 It is a schematic diagram of the exploded structure of the warm air drying device in the present invention.

[0029] Fig. 9 for Figure 8 Schematic diagram of the structure from another angle.

[0030] Fig.10 It is a schematic diagram of the top view structure of the present invention.

[0031] Fig.11 for Fig.10 AA cross-sectional structure schematic diagram.

[0032] Fig.12 for Fig.11 Enlarged structural diagram at B in the middle.

[0033] Fig.13 The figure is a schematic diagram of the exploded structure of the waterproof lampshade in the present invention.

[0034] Fig.14 for Fig.13 Schematic diagram of the structure from another angle.

[0035] Fig.15 It is a schematic diagram of the middle frame structure of the present invention.

[0036] Fig.16 It is a schematic diagram of the steam nozzle structure in the present invention.

[0037] In the figure: 1 is a cover, 11 is a transparent plate, 12 is a bottom frame, 13 is a hinged ear, 14 is a magnet, 2 is a water tank, 21 is a water tank cover, 22 is a water tank support foot, 23 is a second outer flange, 3 is an inner liner, 31 is an inner liner support foot, 32 is an air inlet, 33 is a heat insulation board, 4 is an outer shell, 41 is a cover frame, 411 is a first opening, 412 is a second opening, 42 is a jacket, 43 is a bottom cover, 431 is a filter chamber, 44 is a control panel, 45 is a display window, 46 is an exhaust slot, 47 is a mesh cover, 48 is a damping shaft, 49 is a pressure strip, 410 is a heat insulation layer, 5 is a waterproof lampshade, 51 is a light-transmitting sheet, 52 is a first sealing ring, 53 5 is an upper cover ring, 54 is a second sealing ring, 55 is a lower pressure cover, 6 is a shelf, 61 is a dense mesh surface, 62 is a foot pad, 63 is a sparse mesh surface, 7 is a warm air drying device, 71 is a fan, 711 is an air inlet, 712 is an air outlet, 72 is an air guide shell, 72 is an air inlet, 722 is a second slot, 723 is an exhaust outlet, 724 is an air duct, 73 is a heating element, 74 is an air guide cover, 75 is a second pressing block, 8 is a steam generating device, 81 is an electromagnetic pump, 82 is a steam heater, 83 is an upper box cover, 84 is a lower box cover, 841 is a first slot, 85 is a steam nozzle, 86 is a first pressing block, 9 is a control board, and 91 is a Hall switch. DETAILED DESCRIPTION

[0038] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0039] See also Figures 1 to 16 As shown, a bottle sterilizer includes an outer shell 4 and a cover 1. An inner liner 3 is arranged in the outer shell 4. The top of the inner liner 3 is open and leads to the top of the outer shell 4. The cover 1 covers the top of the inner liner 3; it also includes a water tank 2, a steam generating device 8 and a warm air drying device 7. The steam generating device 8 includes an electromagnetic pump 81, a steam heater 82 and a steam nozzle 85. The water tank 2 is connected to the steam nozzle 85 through the electromagnetic pump 81 and the steam heater 82, and the steam nozzle 85 is connected to the inside of the inner liner 3; the warm air drying device 7 is provided with an air inlet 711 and an air outlet 723. The air inlet 711 is connected to the outside through the outer shell 4, and the air outlet 723 is connected to the inner liner 3. The outer shell 4 is provided with an exhaust groove 46.

[0040] The steam nozzle 85 is arranged at the inner bottom of the inner pot 3 , and a shelf 6 is arranged in the inner pot 3 above the steam nozzle 85 .

[0041] The surface of the layer frame 6 is provided with a sparse mesh surface 63 and a dense mesh surface 61, and the dense mesh surface 61 is directly opposite to the steam nozzle 85. The bottom of the layer frame 6 is also provided with a foot 62, and the foot 62 is supported on the inner bottom of the inner pot 3.

[0042] The bottom of the inner container 3 is also provided with an ultraviolet lamp (not shown in the figure), and a waterproof lampshade 5 is provided outside the ultraviolet lamp. The waterproof lampshade 5 includes an upper cover ring 53, a light-transmitting sheet 51 and a lower pressure cover 55. The bottom of the inner container 3 is provided with a lamp hole 37. The light-transmitting sheet 51 covers the inner ring hole of the upper cover ring 53, and a first sealing ring 52 is provided between the light-transmitting sheet 51 and the bottom surface of the upper cover ring 53. The upper cover ring 53 is arranged on the top surface of the lamp hole 37, and a second sealing ring 54 is provided between the upper cover ring 53 and the top surface of the lamp hole 37. The lower pressure cover 55 is arranged on the bottom surface of the lamp hole 37 and connected to the upper cover ring 53. The light-transmitting sheet 51 and the first sealing ring 52 are pressed between the upper cover ring 53 and the lower pressure cover 55. In this embodiment, two groups of ultraviolet lamps are provided, and the two groups of ultraviolet lamps are respectively arranged on the left and right sides of the steam nozzle 85. The dense holes in the dense hole mesh surface 61 of the shelf 6 refer to smaller holes. In addition, the dense hole mesh surface 61 does not cover the waterproof lampshade 5.

[0043] The water tank 2 is arranged in the outer shell 4 and beside the inner tank 3. The top of the water tank 2 is open and leads to the top of the outer shell 4. A water tank cover 21 is arranged on the top of the water tank 2. A water level detection probe (not shown in the figure) is arranged in the water tank 2. A water level probe installation hole 24 is arranged at the bottom of the water tank 2, and the water level detection probe is arranged in the water level probe installation hole 24.

[0044] The surface cover 1 covers the top of the inner liner 3 and the water storage tank 2 at the same time, and the surface cover 1 and the outer shell 4 are hinged through a damping shaft 48.

[0045] The steam generating device 8 further comprises a support box, in which the electromagnetic pump 81 and the steam heater 82 are arranged, a partition is arranged in the support box corresponding to the electromagnetic pump 81 and the steam heater 82, the support box is connected to the bottom of the inner pot 3, a first slot 841 is arranged on the surface of the support box corresponding to the steam heater 82, a first pressing block 86 is arranged on the first slot 841, a first fuse is arranged in the first slot 841, and the first pressing block 86 presses the first fuse against the surface of the steam heater 82. The support box is connected to the outer bottom of the inner pot 3, the support box comprises an upper box cover 83 and a lower box cover 84, the electromagnetic pump 81 and the steam heater 82 are arranged between the upper box cover 83 and the lower box cover 84, the first slot 841 and the first pressing block 86 are arranged on the bottom surface of the lower box cover 84.

[0046] The electromagnetic pump 81 is provided with a water inlet 812 and a water outlet 811 (the water inlet 812 and the water outlet 811 are not connected inside the electromagnetic pump under normal conditions), and the steam heater 82 includes a heating pipe 821, a water boiling channel and a heat-conducting aluminum block. The heating pipe 821 and the water boiling channel are cast in the heat-conducting aluminum block, and the water boiling channel is provided with a water inlet 822 and a steam outlet 823. A drainage hole 25 is provided at the bottom of the water storage tank 2, and the water inlet 812 of the electromagnetic pump 81 is connected to the drainage hole 25, the water outlet 811 of the electromagnetic pump 81 is connected to the water inlet 822 of the steam heater 82, and the steam outlet 823 of the steam heater 82 is connected to the steam nozzle 85.

[0047] The bottom of the inner pot 3 is provided with a boss 35, and the boss 35 is provided with the lamp hole 37 and the nozzle mounting hole 36. The steam nozzle 85 includes a steam spray hole 851 penetrating the upper and lower ends thereof, and the outer periphery of the upper end of the steam nozzle 85 is provided with an annular convex edge, and the bottom surface of the annular convex edge is in contact with the inner bottom surface of the inner pot 3. The outer periphery of the middle part of the steam nozzle 85 is provided with a connecting thread 852, and the connecting thread 852 is threadedly connected with the nozzle mounting hole 36. The lower end of the steam nozzle 85 is a connecting nozzle 853 with a tooth pattern on the outer periphery, and the connecting nozzle 853 is connected to the steam outlet 823 of the steam heater 82 through a steam pipe.

[0048] The warm air drying device 7 includes a fan 71, an air duct 724 and a heating element 73. The two ends of the air duct 724 are respectively an air inlet 721 and an air outlet 723. The heating element 73 is arranged in the air duct 724. An air inlet hole 32 is provided at the lower part of the inner tank 3. The air inlet hole 32 is connected with the air outlet 723. The fan 71 includes a volute, a motor and a wind wheel. The wind wheel is arranged in the volute and is transmission-connected to the motor. The volute is provided with an air outlet 712 and the air inlet 711. The air outlet 712 is connected with the air inlet hole 32 of the air duct 724. The air duct 724 is surrounded by the air guide shell 72 and the air guide cover 74. The heating element 73 is a PCT heating element (with a number of pores on the surface, which is conducive to heating after the airflow passes through). The air guide shell 72 is provided with a second slot 722 at the installation position corresponding to the heating element 73. A second pressing block 75 is provided on the second slot 722. A second fuse is provided in the second slot 722. The second pressing block 75 presses the second fuse against the surface of the heating element 73. A thermostat (not shown in the figure) is provided between the installation position of the air guide shell 72 corresponding to the heating element 73 and the air inlet 721.

[0049] The shell 4 includes a cover frame 41, an outer cover 42 and a bottom cover 43. The cover frame 41 is respectively provided with a first opening 411 and a second opening 412 corresponding to the top of the inner liner 3 and the water tank 2. The top of the inner liner 3 is provided with a first outer flange connected to the bottom of the first opening 411, and the top of the water tank 2 is provided with a second outer flange 23 connected to the bottom of the second opening 412. The outer cover 42 is arranged between the cover frame 41 and the bottom cover 43. The bottom of the inner liner 3 and the water tank 2 are respectively provided with an inner liner supporting foot 31 and a water tank supporting foot 22, and the lower ends of the inner liner supporting foot 31 and the water tank supporting foot 22 are respectively connected to the bottom cover 43; the surface cover 1 includes a bottom frame 12 and a transparent plate 11, the transparent plate 11 is connected to the top surface of the bottom frame 12, and the outer cover 42 is separated from the inner liner 3 to form a heat insulation layer 410 (which plays a scalding prevention role).

[0050] Two hinged ears 13 are provided on one side of the bottom frame 12 of the surface cover 1 . The damping shaft 48 is positioned on the cover frame 41 through a pressure strip 49 , and the hinged ears 13 are connected to the damping shaft 48 .

[0051] The cover frame 41 of the housing 4 is also provided with a control panel 44 and a display window 45 . A control panel 9 is provided at the bottom of the cover frame 41 . Touch buttons are provided on the control panel 9 corresponding to the bottom of the control panel 44 . A display screen is provided on the control panel 9 corresponding to the display window 45 .

[0052] A Hall switch 91 is also disposed at the bottom of the cover frame 41 of the housing 4 , and a magnet 14 is disposed in the bottom frame 12 of the surface cover 1 corresponding to the Hall switch 91 .

[0053] The bottom of the inner container 3 is also provided with a heat insulation board 33, and a main control circuit board (not shown in the figure) is provided at the bottom of the heat insulation board 33. The Hall switch 91, the control board 9, the steam generating device 8, the warm air drying device 7 and the ultraviolet lamp are electrically connected to the main control circuit board respectively. When the magnet 14 leaves the Hall switch 91 for a certain distance, the main control circuit board at least controls the steam generating device 8 and the ultraviolet lamp to be powered off.

[0054] The bottom surface of the bottom cover 43 is provided with a filter cavity 431 , and the filter cavity 431 is provided with an air hole connected to the inside of the shell 4 . An air filter device such as a filter net can be arranged in the filter cavity 431 . The bottom of the filter cavity 431 is open and connected to the mesh cover 47 .

[0055] Its working principle is: a certain amount of water is injected into the water storage tank 2, the opened milk bottle is placed upside down on the shelf 6, the cover 1 is closed, the milk bottle sterilizer is started, the electromagnetic pump 81 and the steam heater 82 are started, the electromagnetic pump 81 supplies water to the steam heater 82 at appropriate intervals, and the steam heater 82 generates steam in time to sterilize the milk bottle at high temperature; while high temperature sterilization, the ultraviolet lamp can be started to sterilize the milk bottle synchronously. After the steam high temperature sterilization is completed, the warm air drying device 7 is started to dry the inner tank 3 and the milk bottle inside.

Claims

1. A milk bottle sterilizer, comprising a shell (4) and a cover (1), wherein an inner liner (3) is arranged in the shell (4), the top of the inner liner (3) is open and leads to the top of the shell (4), and the cover (1) covers the top of the inner liner (3), characterized in that: It also includes a water storage tank (2), a steam generating device (8) and a warm air drying device (7), wherein the steam generating device (8) includes an electromagnetic pump (81), a steam heater (82) and a steam nozzle (85), the water storage tank (2) is connected to the steam nozzle (85) via the electromagnetic pump (81) and the steam heater (82), and the steam nozzle (85) is connected to the interior of the inner tank (3); the warm air drying device (7) is provided with an air inlet (711) and an air outlet (723), the air inlet (711) is connected to the outside through the outer shell (4), and the air outlet (723) is connected to the inner tank (3), and the outer shell (4) and / or the cover (1) are provided with an exhaust groove (46); The steam nozzle (85) is arranged at the inner bottom of the inner container (3), and a shelf (6) is also arranged in the inner container (3) above the steam nozzle (85); The surface of the shelf (6) is provided with a sparse mesh surface (63) and a dense mesh surface (61), and the dense mesh surface (61) is directly opposite to the steam nozzle (85); An ultraviolet lamp is also provided at the bottom of the inner container (3); The ultraviolet lamp is provided with a waterproof lampshade (5) outside, the waterproof lampshade (5) comprising an upper cover ring (53), a light-transmitting sheet (51) and a lower pressure cover (55); a lamp hole (37) is provided at the bottom of the inner tank (3); the light-transmitting sheet (51) covers the inner ring hole of the upper cover ring (53), and a first sealing ring (52) is provided between the light-transmitting sheet (51) and the bottom surface of the upper cover ring (53); the upper cover ring (53) is arranged on the top surface of the lamp hole (37), and a second sealing ring (54) is provided between the upper cover ring (53) and the top surface of the lamp hole (37); the lower pressure cover (55) is arranged on the bottom surface of the lamp hole (37) and connected to the upper cover ring (53); the light-transmitting sheet (51) and the first sealing ring (52) are crimped between the upper cover ring (53) and the lower pressure cover (55); The steam generating device (8) further comprises a support box, wherein the electromagnetic pump (81) and the steam heater (82) are arranged in the support box, a partition is arranged in the support box between the electromagnetic pump (81) and the steam heater (82), the support box is connected to the bottom of the inner tank (3), a first slot (841) is arranged on the surface of the support box corresponding to the steam heater (82), a first pressing block (86) is arranged on the first slot (841), a first fuse is arranged in the first slot (841), and the first pressing block (86) presses the first fuse against the surface of the steam heater (82).

2. The bottle sterilizer according to claim 1, characterized in that: The water storage tank (2) is arranged inside the outer shell (4) and is located beside the inner tank (3); the top of the water storage tank (2) is open and leads to the top of the outer shell (4); a water tank cover (21) is provided on the top of the water storage tank (2); and a water level detection probe is provided inside the water storage tank (2).

3. The bottle sterilizer according to claim 1, characterized in that: The surface cover (1) covers the top of the inner container (3) and the water storage tank (2) at the same time, and the surface cover (1) and the outer shell (4) are hingedly connected via a damping shaft (48).

4. The bottle sterilizer according to claim 1, characterized in that: The warm air drying device (7) comprises a fan (71), an air duct (724) and a heating element (73), the two ends of the air duct (724) are an air inlet (721) and an air outlet (723), respectively, the heating element (73) is arranged in the air duct (724), an air inlet hole (32) is arranged at the lower part of the inner tank (3), and the air inlet hole (32) is communicated with the air outlet (723), the fan (71) comprises a volute, a motor and a wind wheel, the wind wheel is arranged in the volute and is connected to the motor, the volute is provided with an air outlet (712) and the air inlet (711), and the air outlet (712) is communicated with the air inlet hole (32) of the air duct (724).

5. The bottle sterilizer according to claim 1, characterized in that: The outer shell (4) comprises a cover frame (41), an outer cover (42) and a bottom cover (43); the cover frame (41) is provided with openings corresponding to the tops of the inner liner (3) and the water tank (2); the tops of the inner liner (3) and the water tank (2) are connected to the cover frame (41); the outer cover (42) is arranged between the cover frame (41) and the bottom cover (43); the bottoms of the inner liner (3) and the water tank (2) are provided with inner liner support feet (31) and water tank support feet (22), respectively; the lower ends of the inner liner support feet (31) and the water tank support feet (22) are respectively connected to the bottom cover (43); the surface cover (1) comprises a bottom frame (12) and a transparent plate (11); the transparent plate (11) is connected to the top surface of the bottom frame (12); the outer cover (42) and the inner liner (3) are separated to form a heat insulation layer (410).

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