Vacuum machine

Abstract

The utility model relates to a vacuum machine which comprises a main machine, the main machine comprises an upper shell and a bottom cover arranged at the lower end of the upper shell, a control panel is arranged in the upper shell, a vacuum pump, a battery, an electromagnetic valve and a negative pressure sensor are connected with the control panel, keys connected with the control panel are arranged at the upper end of the upper shell, and a support is further arranged in the upper shell. A cavity is formed in the lower portion of the support and penetrates through the bottom cover, an air guide hole connected with a vacuum pump is formed in the cavity, the water storage tank is arranged outside the cavity, a first through hole communicated with the cavity is formed in the water storage tank, the main machine is further connected with a sealing assembly, the sealing assembly is connected with an extraction opening of a container to be vacuumized, and the sealing assembly and the cavity form an air guide channel. Air in the container to be vacuumized enters the main machine through the air guide channel to be discharged, and water in the container to be vacuumized enters the water storage tank through the air guide channel. Different containers to be vacuumized are connected through the sealing assembly, vacuumizing of the different containers is achieved, water is pumped out for storage while vacuumizing is conducted, and the vacuumizing effect is better.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of vacuum machine especially relates to a vacuum machine. BACKGROUND

[0002] With the increasing demand of people on food preservation, food vacuum preservation is the second only to frozen preservation technical means. Microorganism is often the main reason of food spoilage, in food preservation, the way of vacuum can reduce the air in the sealed space, reduce the oxygen required for the survival of microorganism, so as to inhibit the survival and reproduction of microorganism, and preserve food. In people's life, Mason jar, preservative bag and food jar are often the most commonly used to save food, and the existing vacuum machine can respectively vacuum Mason jar, preservative bag and food jar, but these machines are relatively large, inconvenient to take and store, and relatively expensive, and need hoses, Mason jar sealing sleeve, sealing heads and other accessories for vacuuming the three, and the types of accessories are various and easy to lose.

[0003] Chinese patent publication No. CN221319256U discloses an electric Mason jar vacuum sealing machine, comprising: a cover plate (101), a main body (102), a side anti-skid plate (103), a PCB (104), a battery (106), a gas valve (107), a gas pump (108), a small sealing part (109), a small sealing silica gel ring (112), a large sealing part (113) and a large sealing silica gel ring (114). The utility model realizes the ability to improve air tightness, ensure the vacuum effect, and facilitate the matching of two sizes of Mason jars. The patent only realizes the vacuum of Mason jars with different diameters, but cannot be used for vacuuming food bags or food cans and other similar products, and the use scene is relatively limited.

[0004] Chinese Patent Publication No. CN115367295A discloses a multifunctional Mason jar sealing device, which includes a Mason jar main unit and a sealing converter. The Mason jar main unit includes an isolation plate and a first sleeve located on one side of the isolation plate. A receiving cavity is provided on the other side of the isolation plate, and a vacuum pump is installed within the receiving cavity. The first sleeve is used to install a first Mason jar. When the first Mason jar is inserted into the first sleeve, the vacuum pump removes air from both the first Mason jar and the first sleeve, sealing the first Mason jar to the Mason jar main unit. The sealing converter has a connecting part detachably connected to the first sleeve and a second sleeve that matches a second Mason jar. When the second Mason jar is inserted into the second sleeve, the vacuum pump removes air from both the second Mason jar and the second sleeve, sealing the second Mason jar to the Mason jar main unit. This application can seal Mason jars with a built-in vacuum pump and can seal Mason jars of different diameters. This patent only achieves vacuuming for Mason jars of different diameters, but the juice cannot be stored during the vacuuming process, and it cannot achieve vacuuming for other types of containers. The vacuuming effect is poor, and the applicable scenarios are relatively limited. Utility Model Content

[0005] The technical problem this invention aims to solve is that existing vacuum machines require different hoses or accessories to achieve vacuuming for different types of materials, resulting in a wide variety of accessories that are easily lost. To address these shortcomings of the prior art, this invention provides a vacuum machine.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0007] A vacuum machine is constructed, comprising a main unit, which includes an upper shell and a bottom cover disposed at the lower end of the upper shell. A control board, a vacuum pump, and a battery connected to the control board are disposed inside the upper shell. A button connected to the control board is disposed at the upper end of the upper shell. A support is also disposed inside the upper shell, with its lower part forming a chamber that passes through the bottom cover. An air guide hole connected to the vacuum pump is disposed within the chamber. The vacuum machine also includes a water storage tank disposed outside the chamber, with a first through hole communicating with the chamber. The main unit is further connected to a sealing assembly, which is connected to the air extraction port of the container to be vacuumed and forms an air guide channel with the chamber. Air in the container to be vacuumed enters the main unit through the air guide channel and is discharged, while moisture in the container enters the water storage tank through the air guide channel.

[0008] Preferably, the bottom cover has a second through hole in the middle, and the lower end of the bracket has a connecting post passing through the second through hole, with the inner wall of the connecting post forming a cavity.

[0009] Preferably, the water storage tank and the connecting column are detachably connected, the inner wall of the water storage tank and the connecting column form a cavity, and the air guide channel of the sealing component is connected to the first through hole to form air circulation.

[0010] Preferably, the sealing assembly comprises a sealing element, the sealing element comprises a gas guide column inserted into the first through hole, the bottom of the gas guide column is provided with an air inlet hole, the upper end of the gas guide column is provided with at least one group of air outlet holes, and the air inlet hole and the air outlet hole form an air flow passage.

[0011] Preferably, the water storage tank is provided with an extension in the middle, the gas guide column is provided with a stop column corresponding to the extension, the lower end of the sealing element is provided with a first recess, the air inlet hole is arranged at the first recess, the outer wall of the connecting column is provided with a sealing groove, the sealing groove is provided with a sealing ring, the radius of the sealing ring is greater than the radius of the connecting column, and a friction force is generated between the water storage tank and the sealing ring.

[0012] Preferably, the sealing assembly further comprises a sealing connector, the middle of the sealing connector is provided with a partition plate, the upper end of the partition plate forms a connecting cavity connected with the main machine, and the lower end of the partition plate forms a caliber cavity connected with the container to be vacuumized, the sealing element is arranged in the connecting cavity, and the partition plate is provided with a third through hole corresponding to the air inlet hole.

[0013] Preferably, the partition plate is provided with a sealing ring on the side facing the connecting cavity, the sealing ring is in contact with the lower end of the sealing element to reduce the space between the third through hole and the air inlet hole, the caliber cavity is provided with a plurality of different connecting calibers, the radius of the connecting caliber facing the partition plate is smaller than the radius of the connecting caliber away from the partition plate, the upper end of the sealing connector is provided with a clamping block, the main machine is provided with a clamping groove corresponding to the clamping block, the sealing connector and the main machine are detachably connected through the clamping block and the clamping groove, and the connecting caliber is provided with a sealing ring.

[0014] Preferably, the clamping groove is in L shape, the clamping groove is provided with a limiting groove, the clamping block is provided with a limiting column corresponding to the limiting groove, and the end of the clamping block is provided with an arc-shaped edge.

[0015] Preferably, the main machine is further provided with an electromagnetic valve, the electromagnetic valve is connected with the cavity, the upper end of the main machine is provided with a display screen, the support comprises an upper support and a lower support, the battery and the vacuum pump are fixed through the upper support and the lower support, the main machine and the sealing connector are both provided with an indication mark, the upper part of the main machine is in an elliptical column shape, and the lower part is in a cylindrical shape.

[0016] Preferably, the upper shell is provided with an insertion column, the bottom cover is provided with an insertion groove corresponding to the insertion column, the bottom cover is further provided with a baffle, the baffle limits the front and back directions of the battery and the vacuum pump, the bottom cover is provided with a locking column, the bottom cover and the upper shell are locked through the locking column, and the locking column is provided with a reinforcing rib around the locking column.

[0017] The utility model discloses beneficial effect lies in: through the sealing element realizes the vacuumization of vacuum bag and food jar etc. container, through the sealed connector realizes the vacuumization of Mason jar etc. container of different caliber, and the moisture in the container is extracted to the water storage jar simultaneously with the vacuumization, improves the vacuumization effect. Meanwhile sealed adapter and host are detachably connected through the mode of clamping block and clamping slot, and the convenient dismounting is arranged with the indication mark and the limiting groove and the limiting column also convenient sealed adapter and the connection of host. The frictional connection of water storage jar and sealing ring, convenient water storage jar's dismounting to pour out the water of accumulation, the air flow volume between the third through -hole and the air inlet hole is reduced when sealing element and sealed adapter contact, makes the vacuumization speed more fast, and the efficiency is higher, and the scope of application is wider. And sealed adapter and water storage jar are detachable, convenient cleaning, more sanitary. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical scheme in the embodiment of the utility model or prior art, below will be combined with the drawings and embodiment to the utility model make further explanation, the drawing in the following description only is the part embodiment of the utility model, for the ordinary skilled person in the art comes, under the premise of not paying the creative labor, can also obtain other drawings according to these drawings:

[0019] Figure 1 It is the three-dimensional structure schematic diagram of the vacuum machine of the preferred embodiment of the utility model;

[0020] Figure 2 It is the explosion structure schematic diagram of the host of the preferred embodiment of the utility model;

[0021] Figure 3 It is the shaft side structure schematic diagram of the lower support of the preferred embodiment of the utility model;

[0022] Figure 4 It is another shaft side structure schematic diagram of the lower support of the preferred embodiment of the utility model;

[0023] Figure 5 It is the shaft side structure schematic diagram of the upper shell of the preferred embodiment of the utility model;

[0024] Figure 6 It is the shaft side structure schematic diagram of the bottom cover of the preferred embodiment of the utility model;

[0025] Figure 7 It is the shaft side structure schematic diagram of the water outlet jar of the preferred embodiment of the utility model;

[0026] Figure 8 It is the shaft side structure schematic diagram of the sealing element of the preferred embodiment of the utility model;

[0027] Figure 9 It is another shaft side structure schematic diagram of the sealing element of the preferred embodiment of the utility model;

[0028] Figure 10 This is a three-dimensional structural diagram of the host of a preferred embodiment of the present utility model;

[0029] Figure 11 This is a preferred embodiment of the present utility model. Figure 10 A magnified schematic diagram of the structure at point A in the diagram;

[0030] Figure 12 This is a schematic diagram of the axial structure of the sealing connector according to a preferred embodiment of the present invention;

[0031] Figure 13 This is a preferred embodiment of the present utility model. Figure 12 Enlarged structural diagram at point B in the diagram;

[0032] Figure 14 This is a schematic diagram of another axial structure of the sealing connector according to a preferred embodiment of the present invention. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, a clear and complete description will be provided below in conjunction with the technical solutions in the embodiments of this utility model. Obviously, the described embodiments are some, but not all, embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0034] A vacuum machine according to a preferred embodiment of this utility model; such as Figures 1-2 As shown, the main unit 1 includes a housing 10, a control board 13 disposed within the housing, and a battery 15 electrically connected to the control board. A display screen 12 and buttons 11, electrically connected to the control board, are disposed on the top of the housing. The control board's mode is adjusted via the buttons and displayed on the screen. A vacuum pump 14 and a solenoid valve, as well as a negative pressure sensor, are also disposed within the housing and electrically connected to the control board. The vacuum pump evacuates the container to be evacuated, and the negative pressure sensor detects the negative pressure state within the container. When the evacuated vacuum reaches a specified negative pressure, the vacuum pump stops operating, thus automatically stopping the evacuation process. The housing 10 consists of an upper shell 100 and a bottom cover 101. The lower end of the upper shell is provided with an opening, and the bottom cover is located at the opening. A second through hole 1011 is provided in the middle of the bottom cover. The main unit also includes a sealing element 18 provided at the second through hole. A water storage tank 17 is provided between the sealing element and the bottom cover. The sealing element is in contact with the container to be vacuumed, and an air guide channel is provided in the middle of the sealing element. The air in the container to be vacuumed is extracted by the operation of the vacuum pump, which facilitates the sealing after vacuuming.

[0035] Specifically, such as Figures 2-4As shown, the housing 10 is also provided with a bracket 16, the bracket 16 is composed of detachable connection of upper bracket 160 and lower bracket 161, and the lower bracket and the upper bracket are combined to form a battery seat 1612 and a vacuum pump seat 1613, the battery is placed in the battery seat, and the vacuum pump 14 is placed in the vacuum pump seat, avoiding the left and right and up and down movement of the battery and the vacuum pump. The lower end of the lower bracket 161 is provided with a connecting column 1610, the connecting column passes through the second through hole 1011, and a fluid chamber 1614 is arranged in the connecting column. The bottom wall of the fluid chamber is provided with two groups of air guide holes 1615 corresponding to the vacuum pump, and a group of electromagnetic valve holes 1616 corresponding to the electromagnetic valve, and the electromagnetic valve is arranged at the electromagnetic valve hole. The air guide pipe of the vacuum pump is connected with the air guide hole to realize the suction of the fluid in the fluid chamber, and when the suction is completed, the electromagnetic valve is opened to make a little air enter the fluid chamber, so that the vacuum container to be pumped and the main machine can be separated.

[0036] Further, as shown in Figure 2 and Figure 4 , the outer wall of the connecting column 1610 is formed with a sealing groove 1611, and a sealing ring 19 can be arranged in the sealing groove. The water storage tank is connected with the sealing ring on the outer wall of the connecting column, and the radius of the sealing ring can be slightly larger than the radius of the connecting column, so that a certain friction force is generated between the sealing ring and the inner wall of the water storage tank. It is convenient to install the water storage tank, and it is also convenient to disassemble the water storage tank to pour out the water stored in the vacuum pumping process, so that the juice in the container can be pumped into the water storage tank during vacuum pumping, and the vacuum pumping effect is better. The water storage tank and the connecting column can also be threadedly connected.

[0037] Further, as shown in Figure 1 and Figures 5-6 , a plurality of insertion columns 1000 are arranged inside the upper shell 100, and an insertion slot 1010 is arranged on the bottom cover corresponding to the insertion column. The insertion column is inserted into the insertion slot to facilitate connection and positioning, and then the locking column 1013 is connected and fixed by screws or the like. The bottom cover is also provided with baffles 1014 on the left and right sides, which correspond to the battery and the vacuum pump and limit the battery and the vacuum pump in the front and rear directions, so that the battery and the vacuum pump can only be disassembled after the bracket is disassembled. The bracket can also slow down the transmission of vibration when the vacuum pump works. In order to improve the strength of the bottom cover, the locking column is provided with a reinforcing rib 1012. The upper shell and the upper shell are also provided with a charging port 1001 for charging the battery, which is convenient for charging the vacuum machine. At the same time, in order to facilitate the rotation of the main machine, the upper part of the main machine is an elliptical cylinder, and the lower part is a circular cylinder.

[0038] Further, as shown in Figure 2 and Figures 7-9As shown, in order to further improve the tightness of the main machine and the container connection in the vacuumizing process, the lower end of the water storage tank 17 is connected with a sealing element 18, and the vacuumizing operation is realized by the contact between the sealing element and the air outlet of the container to be vacuumized. The upper end of the sealing element 18 is provided with a gas guide column 180, and the middle part of the water storage tank is provided with a first through hole 171, and the gas guide column is inserted into the first through hole and connected with the water storage tank. At the same time, the first through hole forms an extension column 170 towards the inside of the water storage tank, and the gas guide column is provided with a stop column 182 corresponding to the extension column. After the connecting column is inserted into the first through hole, the stop column and the extension column generate a stop force between them, which can connect the sealing element with the water storage tank. At the same time, it is hollow, the lower end is provided with an air inlet hole 183, and the upper end is provided above the stop column with at least two groups of air outlet holes 181, and the water storage tank and the chamber are communicated, and the air inlet hole and the air outlet hole form a gas guide channel. When vacuumizing is needed, the lower end of the sealing element is aligned with the air outlet of the container to be vacuumized, and the button 11 is pressed to make the vacuum pump 14 work. Because of the communication between the chamber and the gas guide channel, the air inlet hole is communicated with the container to be vacuumized, so as to realize the vacuumizing operation of the container to be vacuumized by the vacuum pump. When the vacuum is realized, the electromagnetic valve is opened to make a little air enter the chamber, so as to separate the container from the main machine, and then the air outlet is locked to complete the vacuumizing operation.

[0039] Further, as shown in Figure 9 , in order to improve the vacuumizing effect, the sealing element 18 should be made of silica gel material which is easy to deform and has good sealing effect. The lower end is provided with a first recess 184, and the air inlet hole is arranged at the first recess. Because of the arrangement of the first recess, there is a little space between the air inlet hole and the air outlet, which is more convenient for vacuumizing operation. Through this way, the vacuumizing operation of the container such as fresh-keeping bag and food can be realized, and the sealing element is aligned with the air outlet of most vacuum bags on the market or the air outlet of the food can.

[0040] Further, as shown in Figure 1 and Figures 10-14As shown, in order to improve the vacuum container type of the vacuum machine, the lower end of the host machine 1 is connected with a sealing connector 2, and the sealing connector can realize the vacuum operation of the Mason jar with different diameters. The lower end of the bottom cover 101 is provided with a second recess 1015, and the peripheral wall of the second recess is provided with a plurality of clamping grooves. The upper end of the sealing connector 2 is provided with a connecting ring 21 corresponding to the second recess, and the outer wall of the connecting ring is provided with a plurality of clamping blocks 26 corresponding to the clamping grooves. The clamping grooves can be designed in an L shape. After aligning the sealing connector with the host machine, the clamping blocks are turned into the clamping grooves to realize the connection of the host machine and the sealing connector, and the connection is more convenient. At the same time, in order to feel that the connection is in place, a limiting column 1017 is arranged in the clamping groove, and a limiting groove 261 corresponding to the limiting column is arranged on the clamping block. During the turning process, when the limiting column is perceived to enter the limiting groove, it can be indicated that the connection is in place. The end of the clamping block is provided with an arc-shaped edge 260, which makes it more convenient for the clamping block to enter the clamping groove and facilitates rotation. At the same time, the outer walls of the host machine and the sealing connector are provided with a first indicating mark 102 and a second indicating mark 20. The first indicating mark is a locking mark and an unlocking mark. After aligning the second indicating mark with the unlocking mark and inserting it, it can also be indicated that the connection is in place, and the connection of the host machine and the sealing connector is more convenient.

[0041] Further, as shown in Figure 12 and Figure 14 The middle part of the sealing connector 2 is divided into two chambers by a partition plate 26. The upper end chamber is provided as a connecting chamber 22 connected with the host machine. A third through hole 23 is formed in the middle part of the connecting chamber. After the host machine is connected with the sealing connector, a sealing element is arranged in the connecting chamber, and the third through hole 23 is aligned with the first recess 184. The other side of the sealing connector is connected with the air outlet of the Mason jar, which can realize the conduction of the chamber and the connecting chamber 22, thereby realizing the vacuum operation of the Mason jar. In order to reduce the volume of the connecting chamber to improve the vacuum efficiency of the Mason jar, a sealing ring 19 is arranged at the bottom of the connecting chamber 22. When the host machine is connected with the sealing connector, an extrusion force is generated between the sealing ring 19 and the sealing element, so that the volume between the sealing ring and the third through hole is communicated with the first recess, thereby reducing the volume after contact and improving the vacuum efficiency. The chamber on the other side of the partition plate can be provided with different diameters of connecting parts as needed, and can be connected with different diameters of Mason jars by cooperating with the sealing ring. In the utility model, a first diameter 24 and a second diameter 25 are arranged, and a sealing ring is arranged at the first diameter and the second diameter. The radius of the first diameter is larger than that of the second diameter, and the first diameter is closer to the end of the sealing connector. It should be understood that the radius of the diameter close to the partition plate 26 is smaller than the radius of the diameter away from the partition plate, thereby realizing the connection of more types of diameters to adapt to the vacuum use of more diameters of Mason jars, and the application range is wider. At the same time, the accessories used when the Mason jars with different diameters are used are the same, thereby improving the applicability of the product.

[0042] It should be understood that the present application is described by some embodiments, and those skilled in the art know that various changes or equivalent replacements can be made to these features and embodiments without departing from the spirit and scope of the present application. In addition, under the guidance of the present application, these features and embodiments can be modified to adapt to specific conditions and materials without departing from the spirit and scope of the present application. Therefore, the present application is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of the present application are within the scope of the present application.

Claims

1. A vacuum machine, comprising a main machine, the main machine comprising an upper shell, a bottom cover arranged at a lower end of the upper shell, a control panel arranged in the upper shell, a vacuum pump and a battery connected with the control panel, a button connected with the control panel arranged at an upper end of the upper shell, a support arranged in the upper shell, a cavity formed at a lower part of the support and passing through the bottom cover, and a gas guide hole connected with the vacuum pump arranged in the cavity, characterized in that: The vacuum machine further comprises a water storage tank arranged outside the chamber, the water storage tank is provided with a first through hole in communication with the chamber, the main machine is further connected with a sealing assembly, the sealing assembly is connected with the air outlet of the container to be vacuumized and forms an air guide channel with the chamber, the air in the container to be vacuumized enters the main machine through the air guide channel and is discharged, and the moisture in the container to be vacuumized enters the water storage tank through the air guide channel, the sealing assembly comprises a sealing element, the sealing element comprises an air guide column inserted into the first through hole, the bottom of the air guide column is provided with an air inlet hole, the upper end is provided with at least one group of air outlet holes, the air inlet hole and the air outlet hole form an air flow passage, the sealing assembly further comprises a sealing connector, the middle of the sealing connector is provided with a partition plate, the upper end of the partition plate forms a connecting cavity connected with the main machine, and the lower end forms a caliber cavity connected with the container to be vacuumized, the sealing element is arranged in the connecting cavity, and the partition plate is provided with a third through hole corresponding to the air inlet hole.

2. The vacuum machine of claim 1, wherein: The middle of the bottom cover is provided with a second through hole, the lower end of the support is provided with a connecting column penetrating through the second through hole, and the inner wall of the connecting column forms a chamber.

3. The vacuum machine of claim 2, wherein: The water storage tank is detachably connected with the connecting column, the inner wall of the water storage tank and the inner wall of the connecting column form a chamber, and the air guide channel of the sealing assembly is connected with the first through hole to form an air flow passage.

4. The vacuum machine of claim 3, wherein: The middle of the water storage tank is provided with an extension, the air guide column is provided with a stop column corresponding to the extension, the lower end of the sealing element is provided with a first recess, the air inlet hole is arranged at the first recess, the outer wall of the connecting column is provided with a sealing groove, the sealing groove is provided with a sealing ring, the radius of the sealing ring is greater than the radius of the connecting column, and friction is generated between the water storage tank and the sealing ring.

5. The vacuum machine of claim 1, wherein: The partition plate is provided with a sealing ring on the side facing the connecting cavity, the sealing ring is in contact with the lower end of the sealing element to reduce the space between the third through hole and the air inlet hole, the caliber cavity is provided with a plurality of different connecting calibers, the radius of the connecting caliber facing the partition plate is smaller than the radius of the connecting caliber away from the partition plate, the upper end of the sealing connector is provided with a clamping block, the main machine is provided with a clamping groove corresponding to the clamping block, the sealing connector and the main machine are detachably connected through the clamping block and the clamping groove, and the connecting caliber is provided with a sealing ring.

6. The vacuum machine of claim 5, wherein: The clamping groove is L-shaped, and a limiting groove is arranged in the clamping groove, a limiting column is arranged on the clamping block corresponding to the limiting groove, and an arc-shaped edge is arranged at the end of the clamping block.

7. The vacuum machine of claim 1, wherein: The main machine is further provided with an electromagnetic valve and a negative pressure sensor, the negative pressure state of the container to be vacuumized is detected through the negative pressure sensor, the electromagnetic valve is connected with the chamber, the upper end of the main machine is provided with a display screen, the support comprises an upper support and a lower support, the battery and the vacuum pump are fixed through the upper support and the lower support, the main machine and the sealing connector are both provided with an indication mark, the upper part of the main machine is in the shape of an elliptical cylinder, and the lower part is in the shape of a cylinder.

8. The vacuum machine of claim 7, wherein: An insertion column is arranged in the upper shell, an insertion groove is arranged on the bottom cover corresponding to the insertion column, a baffle is further arranged on the bottom cover, the baffle limits the front and back directions of the battery and the vacuum pump, a locking column is arranged on the bottom cover, the bottom cover and the upper shell are locked through the locking column, and the locking column is provided with a reinforcing rib.

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