Pressure circulation extraction device

Abstract

The utility model discloses a pressure circulation extraction device, including sealed extraction container, material box, pump unit and water inlet unit, said material box is provided in said extraction container, said material box includes bottom plate and netlike side wall, said bottom plate and netlike side wall form the accommodation chamber, and the material to be extracted is provided in said accommodation chamber, and the water inlet unit is provided in said bottom plate and netlike side wall. The pump unit comprises a pump, a water pumping pipe and a water injection pipe, one end of the water pumping pipe is communicated with the pump, the other end of the water pumping pipe is communicated with the extraction container, one end of the water injection pipe is communicated with the pump, the other end of the water injection pipe is communicated with the containing cavity, and the water inlet unit is communicated with the extraction container; the water inlet filter pipe is arranged on the bottom plate, the bottom plate is arranged on the net-shaped side wall, a material cavity is formed among the bottom plate, the net-shaped side wall and the water inlet filter pipe, and the material to be extracted is arranged in the material cavity. According to the utility model, the extraction is more sufficient, the extraction effect is good, and the efficiency is high.

Description

Technical Field

[0001] The utility model relates to the technical field of extraction, in particular to a pressure circulation extraction device. Background Art

[0002] At present, extractors for tea, coffee, etc. use the traditional static soaking method to make tea or coffee. The tea leaves are in contact with water and left to dissolve to extract the substances inside the tea leaves. However, it cannot fully release the extraction, resulting in low utilization rate of tea leaves and long brewing time. Similarly, coffee cannot be fully extracted. In addition, some pressure extractors grind tea leaves or coffee into powder and then perform pressure extraction to obtain tea soup or coffee concentrate. After grinding, the bitter substances inside the tea leaves are extracted, and milk or syrup is needed to cover up the bitterness. The extraction effect is not good, and at the same time, the extraction amount of this extraction method is small and the efficiency is low. Summary of the Utility Model

[0003] In order to solve at least one of the problems mentioned in the above background art, the utility model provides a pressure circulation extraction device, which can make the extraction more sufficient, with good extraction effect and high efficiency.

[0004] The specific technical solution provided by the utility model is as follows:

[0005] A pressure circulation extraction device is provided, including a sealed extraction container, a material box, a pump unit and a water inlet unit. The material box is arranged inside the extraction container. The material box includes a bottom plate and a mesh side wall. An accommodation cavity is formed between the bottom plate and the mesh side wall, and the material to be extracted is arranged in the accommodation cavity. The pump unit includes a pump, a water suction pipe and a water injection pipe. One end of the water suction pipe is communicated with the pump, and the other end is communicated with the extraction container. One end of the water injection pipe is communicated with the pump, and the other end is communicated with the accommodation cavity. The water inlet unit is communicated with the extraction container.

[0006] As a preference of the above solution, the material box further includes a water inlet filter pipe, which is arranged on the bottom plate. The bottom plate is arranged on the mesh side wall. A material cavity is formed among the bottom plate, the mesh side wall and the water inlet filter pipe, and the material to be extracted is arranged in the material cavity.

[0007] As a preference of the above solution, the extraction container includes an outer cover and a connecting plate. The outer cover is hermetically connected with the connecting plate. An extraction chamber is formed between the outer cover and the connecting plate. The material box is arranged in the extraction chamber. A sunken accommodation part is arranged on the connecting plate. The water suction pipe is communicated with the accommodation part, and the water injection pipe is communicated with the water inlet filter pipe through the accommodation part.

[0008] As a preference of the above solution, the cartridge is arranged above the accommodating part, a supporting part is provided at the bottom of the mesh side wall, and the supporting part is arranged on the connecting plate around the accommodating part.

[0009] As a preference of the above solution, the water inlet unit and the water extraction pipe are connected to two ends of a three-way joint, and the other end of the three-way joint is communicated with the accommodating part.

[0010] As a preference of the above solution, the bottom plate is provided with a connecting part, the connecting part is communicated with the water inlet filter pipe, the water injection pipe is communicated with the connecting part through a water injection joint, the water injection joint is detachably connected with the connecting part, through holes are provided on the side wall of the accommodating part, and the water injection joint passes through the through holes.

[0011] As a preference of the above solution, the water injection joint includes a first joint and a second joint, the first joint passes through the through hole and is fixed on the through hole, one end of the first joint is connected with the connecting part and the other end is connected with the second joint, and the second joint is connected with the water injection pipe.

[0012] As a preference of the above solution, the cartridge further includes a cartridge cover, the cartridge cover covers the mesh side wall, and the cartridge cover is detachably connected with the water inlet filter pipe.

[0013] As a preference of the above solution, the pressure cycle extraction device further includes a control unit, the control unit includes a controller and a control screen, the water inlet unit includes a water inlet pipe, a solenoid valve and a flow valve, the solenoid valve and the flow valve are connected with the water inlet pipe, and the controller is connected with the solenoid valve, the flow valve, the control screen and the pump.

[0014] As a preference of the above solution, a base is further included, the control unit is arranged on the base, the base includes a housing and a substrate, the housing is arranged on the substrate, the connecting plate is arranged on the housing, an accommodating cavity is formed among the connecting plate, the housing and the substrate, the pump unit and the water inlet unit are arranged in the accommodating cavity, and the control screen is arranged on the outer side wall of the housing.

[0015] With the above technical solution, the utility model is provided with an extraction container, a material box, a pump unit and a water inlet unit. During extraction, first place the material to be extracted in the accommodation cavity, and then introduce water into the extraction container through the water inlet unit. After the water injection is completed, the pump is started to draw water from the extraction container through the suction pipe, and then inject water into the accommodation cavity through the injection pipe. The water flows into the extraction container outside the material box through the mesh side wall. The flow rate of the injected water is greater than the flow rate of the water seeping out of the material box through the mesh side wall. The greater the injection flow rate pressure of the pump, the greater the water pressure in the material box. Under the action of the water flow pressure, the material is closely attached to the mesh side wall. Under the action of the water flow and water pressure, the substances in the material will quickly precipitate and dissolve into the water. The extracted material soup is pumped back into the accommodation cavity by the pump through the suction pipe and the injection pipe. In this way, the cycle is repeated, and the material soup gradually becomes thicker from light until the extraction is completed. In this way, through the circulating extraction by the water flow pressure, the extraction is more complete, the extraction effect is good. At the same time, the material soup is automatically discharged from the material box into the extraction container, the materials are automatically separated without filtration, and the extraction efficiency is high. In addition, after the extraction is completed, take out the material from the accommodation cavity, and then start the water inlet unit and the pump unit. The working process is the same as that during extraction. Through the circulating cleaning by the water flow pressure, the mesh side wall and the bottom plate are washed, realizing automatic cleaning, and the cleaning effect is good, preventing dirt from remaining on the material box and the smell from mixing between materials during the next extraction, reducing the food safety risk. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0017] Figure 1 It is a schematic diagram of the overall structure of the present utility model;

[0018] Figure 2 It is Figure 1 A schematic diagram of the structure with the extraction container, the container cover and the housing hidden;

[0019] Figure 3 It is Figure 2 A schematic diagram of the structure from another angle;

[0020] Figure 4 It is a schematic diagram of the partial exploded structure of the present utility model;

[0021] Figure 5 It is a schematic diagram of the connecting plate and the housing in the present utility model;

[0022] Figure 6 It is a schematic diagram of the partial sectional structure of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] To make the objectives, technical solutions and advantages of the present utility model clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part rather than all of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0024] The following content refers to Figures 1 to 6 。

[0025] A pressure cycle extraction device according to the present utility model includes a sealed extraction container 1, a material box 2, a pump unit 3 and a water inlet unit 4. The material box 2 is arranged inside the extraction container 1. The material box 2 includes a bottom plate 21 and a mesh side wall 22. An accommodation cavity (not shown) is formed between the bottom plate 21 and the mesh side wall 22. The material to be extracted is arranged in the accommodation cavity. The pump unit 3 includes a pump 31, a water suction pipe 32 and a water injection pipe 33. One end of the water suction pipe 32 is communicated with the pump 31 and the other end is communicated with the extraction container 1. One end of the water injection pipe 33 is communicated with the pump 31 and the other end is communicated with the accommodation cavity. The water inlet unit 4 is communicated with the extraction container 1. In this embodiment, the mesh side wall 22 is made of metal and has a uniform mesh structure. In this embodiment, the pump 31 is a pressure pump, and the pressure of the pump 31 is adjustable, preferably in the range of 1 - 19 bar. The extraction container 1 can be set for large-capacity extraction. For example, the maximum extraction amount at one time is set to 6 L, so as to achieve batch extraction. A container cover 5 is provided on the extraction container 1, and a handle 51 is provided on the container cover 5.

[0026] The material box 2 further includes a water inlet filter pipe 23. The water inlet filter pipe 23 is arranged on the bottom plate 21. The bottom plate 21 is arranged on the mesh side wall 22. A material cavity 100 is formed among the bottom plate 21, the mesh side wall 22 and the water inlet filter pipe 23. The material to be extracted is arranged in the material cavity 100. In this embodiment, the water inlet filter pipe 23 is arranged in the accommodation cavity and has a uniform mesh structure. The arrangement of the water inlet filter pipe 23 can not only achieve uniform spraying of water into the material cavity 100, improve the extraction effect, but also prevent the material from entering the pump 31 and causing blockage, affecting the extraction process.

[0027] The extraction container 1 includes a housing 11 and a connecting plate 12. The housing 11 is hermetically connected to the connecting plate 12. An extraction chamber is formed between the housing 11 and the connecting plate 12. The material box 2 is disposed in the extraction chamber. The connecting plate 12 is provided with a sunken receiving portion 121. The water suction pipe 32 communicates with the receiving portion 121. The water injection pipe 33 communicates with the water inlet filter pipe 23 through the receiving portion 121. In this embodiment, the housing 11 is a transparent glass cover, which facilitates personnel to clearly observe the extraction state in the extraction chamber. The transparent glass cover is hermetically and fixedly connected to the connecting plate 12. Specifically, a sealing groove (not shown) is provided at the top edge of the connecting plate 12, and a sealing ring (not shown) is provided in the sealing groove. The bottom of the transparent glass cover is pressed against the sealing ring. A silicone rubber (not shown) is provided around the bottom of the transparent glass cover, and the silicone rubber is fixed on the top surface of the connecting plate 12. The above settings make the transparent glass cover and the connecting plate 12 hermetically and fixedly connected. Thus, when the extraction operation is performed in the extraction chamber, the extraction container 1 has a good sealing effect, ensuring the extraction effect. In this embodiment, the receiving portion 121 is a groove. The provision of the receiving portion 121 on the connecting plate 12 facilitates the connection of the extraction container 1 with the water suction pipe 32 and the water injection pipe 33. At the same time, the extracted material soup will converge into the receiving portion 121, facilitating the extraction by the water suction pipe 32.

[0028] The material box 2 is disposed above the receiving portion 121. The bottom of the mesh side wall 22 is provided with a support portion 24. The support portion 24 is disposed on the connecting plate 12 around the receiving portion 121. In this embodiment, the cross sections of the bottom plate 21, the mesh side wall 22, and the water inlet filter pipe 23 are all circular. The water inlet filter pipe 23 extends in the axial direction of the mesh side wall 22. In this embodiment, the support portion 24 is a support foot 24. The support foot 24 includes a circular support ring 241 and a plurality of connecting rods 242. The connecting rods 242 connect the support ring 241 and the mesh side wall 22. The support ring 241 is pressed against the connecting plate 12 around the receiving portion 121. The cross section of the receiving portion 121 is also circular. The provision of the support foot 24 makes the bottom of the bottom plate 21 and the mesh side wall 22 spaced apart from the connecting plate 12 and the receiving portion 121 by a certain distance. This is more conducive to the material soup converging into the receiving portion 121, facilitating the extraction by the water suction pipe 32.

[0029] The pressure cycle extraction device further includes a control unit (not shown), and the control unit includes a controller (not shown) and a control panel 6. The water inlet unit 4 includes a water inlet pipe 41, a solenoid valve 42, and a flow valve 43. The solenoid valve 42 and the flow valve 43 are connected to the water inlet pipe 41. The solenoid valve 42 controls the water inlet of the water inlet pipe 41. The controller is connected to the solenoid valve 42, the flow valve 43, the control panel 6, and the pump 31. The pressure cycle extraction device further includes a base 7. The base 7 includes a housing 71 and a substrate 72. The housing 71 is disposed on the substrate 72. The connecting plate 12 is disposed on the housing 71. An inlet 711 of the water inlet unit 4 is provided on the housing 71. A receiving cavity is formed between the connecting plate 12, the housing 71, and the substrate 72. The pump unit 3 and the water inlet unit 4 are disposed in the receiving cavity. The control unit is disposed on the base 7, and the control panel 6 is disposed on an outer sidewall of the housing 71. In this embodiment, the controller is pre-set with the water volume (flow rate of the flow valve), extraction pressure (pressure of the pump), and time (working time of the pump) corresponding to different types of tea or coffee extraction. The control panel 6 is provided with menu buttons for adjusting the water volume, pressure, time, extraction start / stop, cleaning start / stop, etc., as well as a one-key operation menu corresponding to different types of tea or coffee extraction. At the same time, the pressure cycle extraction device may further include a structure for adjusting the water temperature (such as a water heater, a cooler). The structure for adjusting the water temperature is connected to the controller. The controller is pre-set with the water temperature corresponding to different types of tea or coffee extraction. The control panel 6 is provided with a button for adjusting the water temperature, so as to achieve more convenient extraction operation and multi-functional extraction. The control panel 6 is disposed on the outer wall of the housing 71 to facilitate personnel to perform menu operations. In this embodiment, the housing 71 of the base 7 is fixedly connected to the connecting plate 12. The pump unit 3 and the water inlet unit 4 are disposed in the receiving cavity, so that the pump unit 3 and the water inlet unit 4 can be protected, waterproofed, and dustproofed. The water inlet unit 4 further includes a ball valve 44 and a quarter-inch male-female joint 45. The water inlet pipe 41 is a rigid corrugated pipe. The quarter-inch male-female joint 45 connects the ball valve 44 and the flow valve 43. A solenoid valve 42 is connected between the flow valve 43 and the rigid corrugated pipe. The water inlet unit 4 is fixed to the substrate 72 through a fixing piece 46. The pump 31 is fixed to the substrate 72 through a fixing bracket 34. Four rubber feet 73 are provided at four corners of the bottom of the substrate 72, which facilitates the entire pressure cycle extraction device to be placed on the ground or other platforms and also facilitates buffering during extraction.

[0030] The water inlet unit 4 and the water suction pipe 32 are connected to both ends of a three-way joint 8, and the other end of the three-way joint 8 communicates with the accommodating portion 121. Specifically, the water inlet pipe 41 and the water suction pipe 32 are connected to both ends of the three-way joint 8. In this embodiment, the water inlet pipe 41 is connected to the three-way joint 8 through a joint 47. Specifically, the joint 47 is a quarter-inch 201 joint. Both ends of the joint 47 have threaded portions, and the threaded portions are respectively screwed to the water inlet pipe 41 and the three-way joint 8. The water suction pipe 32 is a threaded pipe, and the three-way joint 8 is also threadedly connected to the water suction pipe 32. A threaded through hole 122 is provided on the side wall of the accommodating portion 121, and the three-way joint 8 is screwed to the threaded through hole 122 through a threaded straight pipe (not shown).

[0031] A connecting portion 211 is provided in the middle of the bottom plate 21. The connecting portion 211 communicates with the water inlet and filtration pipe 23. The water injection pipe 33 communicates with the connecting portion 211 through a water injection joint 9. The water injection joint 9 is detachably connected to the connecting portion 211. A through hole 123 is provided on the side wall of the accommodating portion 121. The water injection joint 9 passes through the through hole 123 and is fixed on the through hole 123. The water injection joint 9 includes a first joint 91 and a second joint 92. The first joint 91 passes through the through hole 123 and is fixed on the through hole 123. One end of the first joint 91 is threadedly connected to the connecting portion, and the other end is threadedly connected to the second joint 92. The second joint 92 is connected to the water injection pipe 33. In this embodiment, the accommodating portion 121 and the material box 2 are provided in the middle of the connecting plate 211. The through hole 123 is provided in the middle of the accommodating portion 121. The water inlet and filtration pipe 23 is provided in the middle of the material box 2. The connecting portion 211 is provided in the middle of the bottom plate 21. The connecting portion 211 includes a through hole 212 in the middle of the bottom plate 21 and a joint 213 fixed on the through hole 212. The joint 213 communicates with the water inlet and filtration pipe 23. Specifically, the joint 213 is a quarter-inch female joint. The first joint 91 is a quarter-inch male and female straight-through joint. The second joint 92 is a quarter-inch female joint. The joint 213 is threadedly connected to the upper end of the first joint 91. The lower end of the first joint 91 is threadedly connected to the upper end of the second joint 92. The water injection pipe 33 is a threaded pipe. The lower end of the second joint 92 is threadedly connected to the upper end of the water injection pipe 33.

[0032] The cartridge 2 further includes a cartridge cover 25 which covers the net-shaped side wall. The cartridge cover is detachably connected to the water inlet filter pipe. A connection hole (not shown) is provided on the cartridge cover 25. A stud 231 is fixed to the upper end of the water inlet filter pipe 23. The cartridge cover 25 is inserted over the stud 231 through the connection hole. A nut 10 is connected to the stud 231, and the nut 10 presses against the cartridge cover 25. In this embodiment, the nut 10 is a wing nut. The connection of the stud 231, the nut 10 and the cartridge cover 25 makes it convenient to fixedly connect or disassemble the cartridge cover 25 to the net-shaped side wall 22. In this embodiment, the stud 231 is provided in the middle of the water inlet filter pipe 23, and the connection hole is provided in the middle of the cartridge cover 25. A net-shaped structure 251 is further provided on the cartridge cover 25 to facilitate the water to overflow from the cartridge cover 25 into the extraction chamber during extraction.

[0033] During the operation of this embodiment, first, the container cover 5 is opened, and the cartridge 2 is rotated in the extraction container 1. The cartridge 2 is removed from the first joint 91 through the screwing action of the joint 213 of the connecting portion 211 and the first joint 91. Then, the nut 10 is rotated and removed, and the cartridge cover 25 is opened. A quantitative amount of material (tea or coffee) is added into the material chamber, and then the cartridge cover 25 is covered and the nut 10 is tightened. Then, the corresponding extraction menu program is selected on the control screen 6 to start extraction. The water inlet unit 4, according to the menu settings, feeds water into the extraction container 1 through the water inlet pipe 41, the three-way joint 8 and the threaded straight pipe. The water amount added into the extraction container 1 is controlled by the solenoid valve 42 and the flow valve 43. After the water inlet is completed, the pump 31 is started to pump water from the extraction container 1 through the water extraction pipe 32, and then inject water into the water inlet filter pipe 23 through the water injection pipe 33. The water is evenly sprayed into the material chamber through the water inlet filter pipe 23. The pumping and water injection pressures of the pump 31 are adjustable. The flow rate of the water injection is greater than the flow rate of the water seeping out of the cartridge 2 through the net-shaped side wall 22. The greater the water injection flow rate pressure of the pump 31, the greater the water pressure in the cartridge 2. The material is pressed against the net-shaped side wall 22 under the action of the water flow pressure. Under the action of the water flow and water pressure, the substances in the material will quickly precipitate and dissolve into the water. The extracted material soup is pumped back into the cartridge 2 by the pump through the water extraction pipe 32 and the water injection pipe 33. Thus, the cycle repeats, and the material soup gradually becomes stronger from light until the extraction ends. In this way, through the circulating extraction by the flowing water pressure, the extraction is more sufficient, the extraction effect is good. At the same time, the material soup is automatically discharged from the cartridge 2 into the extraction container 1, the material is automatically separated and does not need to be filtered, and the extraction efficiency is high. In addition, after the extraction ends, the material is taken out from the cartridge 2, and then the water inlet unit 4 and the pump unit 3 are started. The working process is the same as that during extraction. Through the circulating cleaning by the flowing water pressure, the net-shaped side wall 22, the side wall of the water inlet filter pipe 23 and the bottom plate 21 are washed, realizing automatic cleaning, and the cleaning effect is good, preventing the cartridge from remaining dirt and the materials from having a smell cross between each other during the next extraction, and reducing the food safety risk.

[0034] Although the preferred embodiments in the embodiments of the present utility model have been described, those skilled in the art can make additional changes and modifications once they learn the basic creative concept. Therefore, the appended claims are intended to be construed to include the preferred embodiments and all changes and modifications that fall within the scope of the embodiments of the present utility model.

[0035] Obviously, those skilled in the art can make various changes and modifications to the present utility model without departing from the spirit and scope of the present utility model. Thus, if these modifications and variations of the present utility model fall within the scope of the claims of the present utility model and its equivalent technologies, the present utility model is also intended to include these modifications and variations.

Claims

1. A pressure cycle extraction device, characterized in that: It includes a sealed extraction container, a material box, a pump unit and a water inlet unit, wherein the material box is arranged in the extraction container, the material box includes a bottom plate and a mesh side wall, a receiving cavity is formed between the bottom plate and the mesh side wall, and the material to be extracted is arranged in the receiving cavity, the pump unit includes a pump, a water suction pipe and a water injection pipe, one end of the water suction pipe is connected to the pump, and the other end is connected to the extraction container, one end of the water injection pipe is connected to the pump, and the other end is connected to the receiving cavity, and the water inlet unit is connected to the extraction container.

2. The pressure cycle extraction device according to claim 1, characterized in that: The material box also includes a water inlet filter tube, which is arranged on the bottom plate, and the bottom plate is arranged on the mesh side wall. A material cavity is formed between the bottom plate, the mesh side wall and the water inlet filter tube, and the material to be extracted is arranged in the material cavity.

3. The pressure cycle extraction device according to claim 2, characterized in that: The extraction container comprises an outer cover and a connecting plate, wherein the outer cover is sealedly connected to the connecting plate, an extraction chamber is formed between the outer cover and the connecting plate, the material box is arranged in the extraction chamber, a sunken accommodation portion is provided on the connecting plate, the water pump is connected to the accommodation portion, and the water injection pipe is connected to the water inlet filter pipe through the accommodation portion.

4. The pressure cycle extraction device according to claim 3, characterized in that: The material box is arranged above the accommodating portion, a supporting portion is provided at the bottom of the mesh side wall, and the supporting portion is arranged on the connecting plate around the accommodating portion.

5. The pressure cycle extraction device according to claim 3, characterized in that: The water inlet unit and the water pumping pipe are connected to two ends of a three-way joint, and the other end of the three-way joint is communicated with the accommodating portion.

6. The pressure cycle extraction device according to claim 3, characterized in that: The bottom plate is provided with a connecting portion, the connecting portion is connected to the water inlet filter pipe, the water injection pipe is connected to the connecting portion through a water injection joint, the water injection joint is detachably connected to the connecting portion, and a through hole is provided on the side wall of the accommodating portion, and the water injection joint passes through the through hole.

7. The pressure cycle extraction device according to claim 6, characterized in that: The water injection joint includes a first joint and a second joint, the first joint passes through the through hole and is fixed on the through hole, one end of the first joint is connected to the connecting part and the other end is connected to the second joint, and the second joint is connected to the water injection pipe.

8. The pressure cycle extraction device according to any one of claims 2 to 7, characterized in that: The material box also includes a material box cover, which covers the mesh side wall and is detachably connected to the water inlet filter pipe.

9. The pressure cycle extraction device according to claim 3, characterized in that: It also includes a control unit, which includes a controller and a control panel. The water inlet unit includes a water inlet pipe, a solenoid valve and a flow valve. The solenoid valve and the flow valve are connected to the water inlet pipe, and the controller is connected to the solenoid valve, the flow valve, the control panel and the pump.

10. The pressure cycle extraction device according to claim 9, characterized in that: It also includes a base, the control unit is arranged on the base, the base includes a cover shell and a base plate, the cover shell is arranged on the base plate, the connecting plate is arranged on the cover shell, a accommodating cavity is formed between the connecting plate, the cover shell and the base plate, the pump unit and the water inlet unit are arranged in the accommodating cavity, and the control panel is arranged on the outer side wall of the cover shell.

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