A waterproof protection device for electric meter box

Abstract

The present invention relates to the technical field of waterproof equipment, and more specifically to a waterproof protective device for an electric meter box, including an electric meter box structure, the electric meter box structure including an equipment shell, the front of the equipment shell is provided with an inner groove, the top of the equipment shell is provided with a water storage tank, the front and back of the other side of the water storage tank are provided with grooves, the top and middle of the inner groove are provided with support plates, the front and back of both sides of the two support plates are fixedly connected with fixing plates, the top and bottom of the inner sides of the eight fixing plates are provided with fixing bolts, the front of the two support plates are fixedly connected with three electric meters, the bottom of the other side of the equipment shell is provided with a cable outlet, the top of the electric meter box structure is provided with a sealing structure, the sealing structure includes a buoyancy plate, the front and back of the buoyancy plate are fixedly connected with positioning blocks, and the top of one side of the back of the equipment shell is fixedly connected with a drainage pipe.

Description

Technical Field

[0001] The present invention relates to the technical field of waterproof equipment, and more specifically to a waterproof protection device for an electric meter box. Background Art

[0002] When residents use electricity, the connected wires will first go through the meter and then be connected to the household. By connecting the meter, the actual amount of electricity used by the residents can be known at all times. Connecting the meter through wires can also prevent sudden short circuits from causing damage to the household appliances. The meter is usually installed in a special meter box, which is used to protect the internal meter. It is installed on the surface wall in the corridor or outside the residents. The meter box can prevent water or dust from entering the meter box.

[0003] The meter box is generally made of iron sheet, and its inside and outside are coated with waterproof coating, which can play a certain waterproof effect. The iron sheet has good thermal conductivity. During the operation of the meter, it can dissipate the heat generated by the internal meter, preventing the high internal heat from causing the meter to malfunction.

[0004] The existing electric meter boxes generally do not have a special waterproof system. In heavy rainy weather, they are all protected from rain by external coatings. If there is a windy and rainy environment, the wind will blow the rain to cause it to tilt, and the rain will invade the inside of the electric meter box through the outlet of the cable. Long-term rain invasion will cause a short circuit in the electric meter inside the electric meter box, causing equipment operation problems. In addition, in rainy weather, the water molecules in the air are free in the air for a long time due to the lack of sunlight evaporation. The water molecules in the air will invade the inside of the equipment through the gaps. The long-term attachment of water molecules to the inner wall of the equipment and the electric meter will cause oxidation of the equipment, and its service life cannot be guaranteed. Summary of the invention

[0005] In order to overcome the above defects of the prior art, the present invention provides a waterproof protection device for an electric meter box to solve the problems existing in the above background technology.

[0006] The present invention provides the following technical solution: a waterproof protection device for an electric meter box, comprising an electric meter box structure, the electric meter box structure comprising an equipment shell, the front of the equipment shell is provided with an inner groove, the top of the equipment shell is provided with a water storage tank, the front and back of the other side of the water storage tank are provided with grooves, the top and middle of the inner groove are provided with support plates, the front and back of both sides of the two support plates are fixedly connected with fixing plates, the top and bottom of the inner sides of the eight fixing plates are provided with fixing bolts, the front of the two support plates are fixedly connected with three electric meters, the bottom of the other side of the equipment shell is provided with a cable outlet, and the top of the electric meter box structure is provided with a sealing Structure, the sealing structure includes a buoyancy plate, the front and back of the buoyancy plate are fixedly connected with a positioning block, the top of the back side of the equipment housing is fixedly connected with a drainage pipe, the middle and front of the bottom of the buoyancy plate are fixedly connected with a pull rod, the bottoms of the two pull rods are fixedly connected with a connecting block, the middle parts of the two connecting blocks are fixedly connected with a silica gel fixed empty plate, the silica gel fixed empty plate is provided with a silica gel block inside, the bottoms of the two connecting blocks are fixedly connected with a reset rod, the bottoms of the two reset rods are fixedly connected with a limiting plate, the tops of the two limiting plates are fixedly connected with a reset spring, and the bottom of the sealing structure is provided with a dehumidification structure.

[0007] Furthermore, the dehumidification structure includes a dehumidifier, the front and back of the bottom of the dehumidifier are fixedly connected to current circuits, the other ends of the two current circuits are fixedly connected to connectors, the middle parts of the two connectors are provided with a passage device, the top of the passage device is fixedly connected to a stretching rod, the two connectors include an inward-retracted column, the interiors of the two inward-retracted columns are provided with ejection springs, the front parts of the two ejection springs are fixedly connected to ejection limit disks, the front parts of the two ejection limit disks are fixedly connected to power-on columns, the passage device includes a plastic block, and the front and back parts of the plastic block are provided with conductive blocks The middle and bottom of the plastic block are fixedly connected with a copper column, the top and bottom of the front of the two conductive blocks are provided with recessed bolts, the stretching rod includes a movable column, the bottom of the movable column is fixedly connected with a limiting column, the bottom of the limiting column is fixedly connected with a tension spring, the outer wall of the movable column is surrounded by a bottom barrel column, the front of the meter box structure is provided with a door panel structure, the door panel structure includes a door panel, the middle of the door panel is fixedly connected with an observation window, the front of the door panel is provided with a groove, both sides of the front of the door panel are fixedly connected with opening handles, and the top and bottom of one side of the front of the door panel are fixedly connected with hinges.

[0008] Furthermore, the top-view shape of the grooves provided at the front and back of the other side of the water tank is the same as the shape of the positioning blocks fixedly connected to the front and back of the buoyancy board, the length of the buoyancy board is adapted to the width of the water tank, the interior of the buoyancy board is hollow and filled with air, and the drainage pipe is connected to the water tank and connected to the back of the lowest end of the water tank.

[0009] Furthermore, the silicone block is made of silicone, the diameter of the silicone fixed empty disk is matched with the diameter of the cable outlet, and the ratio of the diameter of the two pull rods to the top area of ​​the connecting block is four to five.

[0010] Furthermore, the top of the stretching rod is fixedly connected to the bottom of the silicone fixed empty plate, the size of the limiting column is adapted to the size of the internal slot of the bottom barrel column, and the ratio of the height of the two bottom barrel columns to the size of the plastic block is two to one.

[0011] Furthermore, the conductive block is in the shape of an arc at one side of the top, the plastic block is in the shape of a T and the bending part is in the shape of an arc, and the front part of the power-carrying column is in the shape of a sphere.

[0012] Furthermore, the width and height of the door panel are adapted to the width and height of the front of the equipment housing, the backs of the two hinge fronts are fixedly connected to one side of the front of the door panel, and the other side of the back of the observation window is fixedly connected to the front of one side of the equipment housing.

[0013] Technical effects and advantages of the present invention:

[0014] 1. The present invention is provided with a sealing structure, which is beneficial for isolating the equipment from rainwater outside on rainy days, preventing rainwater from entering the equipment from the cable outlet and causing internal damage to the equipment. By operating the equipment using buoyancy, the equipment can be accurately positioned on rainy days, so that the equipment can dissipate heat in rainless weather and can be internally sealed in rainy weather to block water and protect the internal circuit.

[0015] 2. The present invention is provided with a dehumidification structure, which helps to prevent the active water molecules in the air on rainy days from entering the inside of the device through the gaps and adhering to the inside of the device for a long time, causing oxidation of the device. By linking its switch with the sealing structure, the dehumidification time of the device can be controlled to prevent waste of resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0017] Figure 2 It is a schematic diagram of the structure of the electric meter box of the present invention.

[0018] Figure 3 It is a cross-sectional view of the sealing structure of the present invention.

[0019] Figure 4 It is a schematic diagram of the dehumidification structure of the present invention.

[0020] Figure 5 It is a cross-sectional view of the stretching rod structure of the present invention.

[0021] Figure 6 It is a schematic diagram of the structure of the access device of the present invention.

[0022] Figure 7 It is a schematic diagram of the connector structure of the present invention.

[0023] Figure 8 It is a schematic diagram of the door panel structure of the present invention.

[0024] The accompanying drawings are marked as follows: 1. Electric meter box structure; 101. Equipment housing; 102. Fixing bolt; 103. Fixing plate; 104. Support plate; 105. Electric meter; 106. Water storage tank; 107. Cable outlet; 108. Inner tank; 2. Sealing structure; 201. Buoyancy plate; 202. Positioning block; 203. Pull rod; 204. Silicone block; 205. Connecting block; 206. Silicone fixed empty plate; 207. Reset rod; 208. Reset spring; 209. Limiting plate; 210. Drainage pipe; 3. Door panel structure; 301. Door panel; 302, opening handle; 303, observation window; 304, hinge; 4, dehumidification structure; 401, dehumidifier; 402, current circuit; 403, connector; 404, passage device; 405, stretching rod; 4051, movable column; 4052, bottom barrel column; 4053, limit column; 4054, tension spring; 4041, plastic block; 4042, conductive block; 4043, recessed bolt; 4044, copper column; 4031, retracted column; 4032, ejection spring; 4033, ejection limit disc; 4034, power column. DETAILED DESCRIPTION

[0025] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the present invention. In addition, the forms of the various structures recorded in the following embodiments are merely illustrative, and the waterproof protection device for the meter box involved in the present invention is not limited to the various structures recorded in the following embodiments. All other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the present invention.

[0026] Reference Figure 1 and Figure 2The present invention provides a waterproof protection device for an electric meter box, comprising an electric meter box structure 1, the electric meter box structure 1 comprising an equipment housing 101, an inner groove 108 is provided at the front of the equipment housing 101, a water storage tank 106 is provided at the top of the equipment housing 101, grooves are provided at the front and back of the other side of the water storage tank 106, support plates 104 are provided at the top and middle of the inner groove 108, the front and back of both sides of the two support plates 104 are fixedly connected with fixing plates 103, the top and bottom of the inner sides of the eight fixing plates 103 are provided with fixing bolts 102, three electric meters 105 are fixedly connected at the front of the two support plates 104, a cable outlet 107 is provided at the bottom of the other side of the equipment housing 101, a sealing structure 2 is provided at the top of the electric meter box structure 1, and a sealing structure 2 is provided at the top of the electric meter box structure 1. The structure 2 includes a buoyancy plate 201, the front and back of the buoyancy plate 201 are fixedly connected with a positioning block 202, the top of the back side of the equipment housing 101 is fixedly connected with a drainage pipe 210, the middle and front of the bottom of the buoyancy plate 201 are fixedly connected with a pull rod 203, the bottoms of the two pull rods 203 are fixedly connected with a connecting block 205, the middle of the two connecting blocks 205 are fixedly connected with a silica gel fixed empty plate 206, the inside of the silica gel fixed empty plate 206 is provided with a silica gel block 204, the bottoms of the two connecting blocks 205 are fixedly connected with a reset rod 207, the bottoms of the two reset rods 207 are fixedly connected with a limiting plate 209, the tops of the two limiting plates 209 are fixedly connected with a reset spring 208, and the bottom of the sealing structure 2 is provided with a dehumidification structure 4.

[0027] What needs to be specifically explained in this embodiment is that, by providing a sealing structure 2, the wiring hole can be sealed to prevent external water from tilting due to wind and entering the inside of the device to cause internal damage to the device and cause the device to malfunction; by providing two reset springs 208, the sealing structure 2 can be reset to prevent the heat generated during the operation of the device from being unable to dissipate; by providing a buoyancy plate 201, the water can be slowly discharged, so that after the rain stops, it can generate buoyancy for enough time to support the operation of the dehumidification structure 4.

[0028] Reference Figure 1The dehumidification structure 4 includes a dehumidifier 401, the front and back of the bottom of the dehumidifier 401 are fixedly connected with a current line 402, the other ends of the two current lines 402 are fixedly connected with connectors 403, the middle of the two connectors 403 is provided with a pass-through device 404, the top of the pass-through device 404 is fixedly connected with a stretching rod 405, the two connectors 403 include a retracted column 4031, the inside of the two retracted columns 4031 is provided with an ejection spring 4032, the front of the two ejection springs 4032 is fixedly connected with an ejection limit disc 4033, the front of the two ejection limit discs 4033 is fixedly connected with a power-on column 4034, the pass-through device 404 includes a plastic block 4041, the front and back of the plastic block 4041 are provided with a conductive block 4042, The middle and bottom of the plastic block 4041 are fixedly connected with a copper column 4044, the top and bottom of the front of the two conductive blocks 4042 are provided with recessed bolts 4043, the stretching rod 405 includes a movable column 4051, the bottom of the movable column 4051 is fixedly connected with a limiting column 4053, the bottom of the limiting column 4053 is fixedly connected with a tension spring 4054, the outer wall of the movable column 4051 is surrounded by a bottom barrel column 4052, the front of the meter box structure 1 is provided with a door panel structure 3, the door panel structure 3 includes a door panel 301, the middle of the door panel 301 is fixedly connected with an observation window 303, the front of the door panel 301 is provided with a groove, the two sides of the front of the door panel 301 are fixedly connected with opening handles 302, and the top and bottom of one side of the front of the door panel 301 are fixedly connected with hinges 304.

[0029] What needs to be specifically explained in this embodiment is that, by providing a door panel structure 3, it is possible to dehumidify the water molecules that enter the interior of the device due to rainy weather, thereby preventing the service life of the device from being too short due to long-term moisture inside the device. By providing a passage device 404, the operation of the dehumidifier can be controlled so that it only operates on rainy days and after rainy days, thereby preventing waste of resources.

[0030] Reference Figure 1 The top view shape of the grooves opened on the front and back of the other side of the water tank 106 is the same as the shape of the positioning block 202 fixedly connected to the front and back of the buoyancy board 201. The length of the buoyancy board 201 is adapted to the width of the water tank 106. The interior of the buoyancy board 201 is hollow and filled with air. The drainage pipe 210 is connected to the water tank 106 and is connected to the back of the lowest end of the water tank 106.

[0031] What needs to be specifically explained in the present embodiment is that the top-view shape of the grooves provided at the front and back of the other side of the water storage tank 106 is the same as the shape of the positioning block 202 fixedly connected to the front and back of the buoyancy board 201, which can position the buoyancy board 201 to prevent the buoyancy board 201 from rotating under the action of buoyancy. By making the interior of the buoyancy board 201 hollow and filled with air, the buoyancy board 201 can generate greater buoyancy to support the operation of the sealing structure 2 and the dehumidification structure 4 at the bottom.

[0032] Reference Figure 1 The silicone block 204 is made of silicone, the diameter of the silicone fixed empty plate 206 is compatible with the diameter of the cable outlet 107, and the ratio of the diameter of the two pull rods 203 to the top area of ​​the connecting block 205 is four to five.

[0033] What needs to be specifically explained in this embodiment is that the silicone block 204 is made of silicone, which has good elasticity, light weight, and strong plasticity, and can meet the sealing requirements thereof, and can be quickly restored after the sealing is completed.

[0034] Reference Figure 1 The top of the stretch rod 405 is fixedly connected to the bottom of the silicone fixed empty plate 206, the size of the limiting column 4053 is adapted to the internal slot size of the bottom barrel column 4052, and the height ratio of the two bottom barrel columns 4052 to the size of the plastic block 4041 is two to one.

[0035] What needs to be specifically explained in the present embodiment is that, by fixing the top of the stretching rod 405 to the bottom of the silicone fixed empty plate 206, the movement of the silicone fixed empty plate 206 can drive the stretching rod 405 to move, so that the dehumidification structure 4 can be restored from the off-circuit state to the on-circuit state, so that the dehumidifier 401 can be operated. By making the height of the bottom barrel column 4052 and the size of the plastic block 4041 ratio of two to one, the dehumidification structure 4 can be kept in the on-circuit state for the maximum time, so that the inside of the device can be better dehumidified.

[0036] Reference Figure 1 The conductive block 4042 is in the shape of an arc at one side of the top, the plastic block 4041 is in the shape of a T and the bending part is in the shape of an arc, and the front part of the power-carrying column 4034 is in the shape of a sphere.

[0037] It should be specifically explained in this embodiment that the conductive block 4042 is shaped as an arc on one side of the top, and the front of the power-carrying column 4034 is spherical, so that the two parts can be connected more smoothly.

[0038] Reference Figure 1The width and height of the door panel 301 are matched with the width and height of the front of the equipment housing 101. The backs of the fronts of the two hinges 304 are fixedly connected to one side of the front of the door panel 301, and the other side of the back of the observation window 303 is fixedly connected to the front of one side of the equipment housing 101.

[0039] It should be specifically explained in this embodiment that by matching the width and height of the door panel 301 with the width and height of the front of the device housing 101 , the front of the device can be sealed to prevent water vapor from entering.

[0040] The working principle of the present invention is as follows: first, the device is fixedly installed in a suitable position, its lines are connected and discharged through the cable outlet 107. When it rains, the water storage tank 106 opened on the top of the device housing 101 is first in contact with rainwater. Since the water storage tank 106 is an inclined tank design, the rainwater will be concentrated on the other side of the water storage tank 106. As the rainwater accumulates, the buoyancy board 201 will be lifted to float upward. The floating of the buoyancy board 201 drives the positioning block 202 fixedly connected to the front and back of the buoyancy board 201 to move upward. As the rainwater accumulates, the drainage pipe 210 will discharge a certain amount of rainwater. When there is more rainwater, the pressure on the drainage pipe 210 will be greater, and the speed of rainwater discharge will be faster. When the drainage pipe 210 moves upward, it will impress the two pull rods 203 at the bottom, and the two pull rods 203 move upward to bring The two connecting blocks 205 move upward, and the two connecting blocks 205 move upward, driving the silicone fixed empty plate 206 to move upward. A silicone block 204 is arranged inside the silicone fixed empty plate 206. The silicone fixed empty plate 206 moves upward, driving the silicone block 204 to move upward. The silicone block 204 moves upward to cover the wiring and wiring port 107 thereof. The two connecting blocks 205 move upward, driving the two reset rods 207 to move upward, driving the two reset rods 207 to move upward, driving the limit plates 209 to move upward, and the two limit plates 209 move upward to squeeze the two reset springs. It is not raining that day. After the water flows out slowly along the drainage pipe 210, the buoyancy plate 201 is no longer subjected to buoyancy. When the buoyancy plate 201 is no longer subjected to buoyancy, no pulling force is applied to the reset spring, and the reset spring rebounds and resets the whole body.

[0041] When the silicone fixed empty plate 206 is pulled upward by the buoyancy generated by the buoyancy plate 201, the movable column 4051 is pulled upward. Since the bottom of the movable column 4051 is fixedly connected to the limit column 4053, and the bottom of the limit column 4053 is fixedly connected to the tension spring 4054, the tension generated by the tension spring 4054 is greater than the force of the bottom barrel column 4052 and the bottom connection, the upward movement of the movable column 4051 drives the bottom barrel column 4052 to move upward, and the upward movement of the bottom barrel column 4052 drives the passage device 404 upward. Movement, the passage device 404 moves upward to squeeze the connector 403 to retract, and when the energized column 4034 contacts the conductive block 4042, the current passes through the conductive block 4042 and the copper column 4044 to form a passage to make the dehumidifier 401 operate. When it is no longer raining and the water in the water storage tank 106 has flowed out and no buoyancy is generated, the silicone fixed empty plate 206 moves downward, causing the stretching rod 405 and the passage device 404 to move downward to reset them, then the current circuit 402 is in a short-circuit state, and the dehumidifier 401 stops moving.

[0042] Finally, a few points should be explained: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, which may refer to mechanical connection or electrical connection, or internal communication between two components, or direct connection. "upper", "lower", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may change;

[0043] Secondly: In the drawings of the embodiments disclosed in the present invention, only the structures related to the embodiments disclosed in the present invention are involved, and other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of the present invention can be combined with each other;

[0044] Finally: The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A waterproof protection device for an electric meter box, comprising an electric meter box structure (1), characterized in that: The electric meter box structure (1) comprises an equipment housing (101), the front of the equipment housing (101) is provided with an inner groove (108), the top of the equipment housing (101) is provided with a water storage tank (106), the front and back of the other side of the water storage tank (106) are provided with grooves, the top and middle of the inner groove (108) are provided with support plates (104), the front and back of both sides of the two support plates (104) are fixedly connected with fixing plates (103), the top and bottom of the inner sides of the eight fixing plates (103) are provided with fixing bolts (102), the front of the two support plates (104) are fixedly connected with three electric meters (105), the bottom of the other side of the equipment housing (101) is provided with a wiring port (107), the top of the electric meter box structure (1) is provided with a sealing structure (2), the sealing structure (2) comprises a buoyancy plate (201), The front and back of the buoyancy plate (201) are fixedly connected with a positioning block (202); the top of the back side of the device housing (101) is fixedly connected with a drainage pipe (210); the middle and front of the bottom of the buoyancy plate (201) are fixedly connected with a pull rod (203); the bottoms of the two pull rods (203) are fixedly connected with a connecting block (205); the middle of the two connecting blocks (205) are fixedly connected with a silica gel fixed empty plate (206); a silica gel block (204) is provided inside the silica gel fixed empty plate (206); the bottoms of the two connecting blocks (205) are fixedly connected with a reset rod (207); the bottoms of the two reset rods (207) are fixedly connected with a limit plate (209); the tops of the two limit plates (209) are fixedly connected with a reset spring (208); and the bottom of the sealing structure (2) is provided with a dehumidification structure (4); The dehumidification structure (4) comprises a dehumidifier (401), the front and back of the bottom of the dehumidifier (401) are fixedly connected to a current line (402), the other ends of the two current lines (402) are fixedly connected to connectors (403), a passage device (404) is provided in the middle of the two connectors (403), a stretching rod (405) is fixedly connected to the top of the passage device (404), and the two connectors (403) include a retracted column (404). 31), the interiors of the two retracted columns (4031) are each provided with an ejection spring (4032), the fronts of the two ejection springs (4032) are each fixedly connected to an ejection limit disc (4033), the fronts of the two ejection limit discs (4033) are each fixedly connected to an energizing column (4034), the access device (404) comprises a plastic block (4041), the front and back of the plastic block (4041) are each provided with a conductive block (4042), the plastic The middle and bottom of the rubber block (4041) are fixedly connected with a copper column (4044), the top and bottom of the front of the two conductive blocks (4042) are both provided with recessed bolts (4043), the stretching rod (405) includes a movable column (4051), the bottom of the movable column (4051) is fixedly connected with a limit column (4053), the bottom of the limit column (4053) is fixedly connected with a tension spring (4054), and the outer wall of the movable column (4051) surrounds A bottom barrel column (4052) is provided, and a door panel structure (3) is provided at the front of the electric meter box structure (1), wherein the door panel structure (3) comprises a door panel (301), an observation window (303) is fixedly connected to the middle of the door panel (301), a groove is provided at the front of the door panel (301), opening handles (302) are fixedly connected to both sides of the front of the door panel (301), and hinges (304) are fixedly connected to the top and bottom of one side of the front of the door panel (301); The top view shape of the grooves provided at the front and back of the other side of the water storage tank (106) is the same as the shape of the positioning block (202) fixedly connected to the front and back of the buoyancy board (201); the length of the buoyancy board (201) is adapted to the width of the water storage tank (106); the interior of the buoyancy board (201) is hollow and filled with air; the drainage pipe (210) is connected to the water storage tank (106) and is connected to the back of the lowest end of the water storage tank (106); The silica gel block (204) is made of silica gel, the diameter of the silica gel fixed empty plate (206) is matched with the diameter of the cable outlet (107), and the ratio of the diameter of the two pull rods (203) to the top area of ​​the connecting block (205) is four to five; The top of the stretching rod (405) is fixedly connected to the bottom of the silicone fixed empty plate (206), the size of the limiting column (4053) is adapted to the size of the internal slot of the bottom barrel column (4052), and the height ratio of the two bottom barrel columns (4052) to the size of the plastic block (4041) is two to one; The conductive block (4042) is in the shape of an arc at one side of the top, the plastic block (4041) is in the shape of a T and the bending part is in the shape of an arc, and the front part of the power-carrying column (4034) is in the shape of a sphere; The width and height of the door panel (301) are matched to the width and height of the front of the device housing (101); the backs of the fronts of the two hinges (304) are fixedly connected to one side of the front of the door panel (301); and the other side of the back of the observation window (303) is fixedly connected to the front of one side of the device housing (101).

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