CN220545293U - Casing and electrical equipment - Google Patents

Abstract

The utility model discloses a casing and electrical equipment, wherein the casing comprises a main body, an upper cover plate and a lower cover plate, wherein the main body forms a cavity with an opening at one side, and comprises a first installation part and a second installation part, and the thickness of the first installation part is larger than that of the second installation part; the upper cover plate and the lower cover plate are sequentially and detachably covered on the opening along the height direction, and when the upper cover plate is connected with the first installation part and the lower cover plate is connected with the second installation part, the lower edge of the upper cover plate is partially overlapped with the upper edge of the lower cover plate. In the utility model, the shell achieves an effective waterproof function by constructing an overlapped surrounding structure of the upper cover plate and the lower cover plate; the operation of pasting sealing strips or dispensing and the like is not involved, the manufacturing process of the cover plate can be simplified, the manufacturing cost of the machine shell is saved, the problem of environmental reliability resistance of sealing materials is avoided, and meanwhile, the convenience of the disassembly and assembly operation of the cover plate is greatly improved.

Description

Casing and electrical equipment

Technical Field

The utility model relates to the technical field of electrical equipment protection, in particular to a shell and electrical equipment.

Background

The enclosure generally refers to a free-standing or self-supporting enclosure and cabinet for housing power electronics, and is an integral part of the electrical equipment as a carrier for the electrical control equipment. The shell is generally made of cold-rolled steel plates, hot-galvanized plates or plastics and the like, and can play a role in protecting internal equipment from water, dust, electromagnetic interference and the like. The national standard of the people's republic of China, GB 4208-2008, protection class of housing (IP code) sets the protection class of the housing, wherein the IPX3 protection class means that the device is prevented from being harmful to the device due to the fact that water drenches into the housing within 60-degree included angle of the vertical plane.

The double-cover board shell is generally provided with sealing strips on the mounting surface of the lower edge of the upper cover board or the mounting surface of the upper edge of the lower cover board to realize IPX 3-level waterproof. However, in some application environments with high temperature and humidity, high air salt fog content or strong illumination, the sealing strip often has failure phenomena such as fracture, pulverization, falling off and the like in the service life period of the whole product. And because of the existence of sealing strip, after having fixed one of them apron, need make its extrusion sealing strip of thrust at first when installing another apron, simultaneously use the screw to fasten the apron on the casing for the operation convenience of whole assembly process is relatively poor.

Disclosure of Invention

The utility model mainly aims to provide a shell and electrical equipment, and aims to solve the problems that a sealing strip is easy to fail and the operation convenience in the assembly process is poor.

In order to achieve the above object, the present utility model provides a casing, which includes a main body, an upper cover plate, and a lower cover plate, wherein the main body forms a cavity with an opening at one side, and the main body includes a first mounting portion and a second mounting portion, and the thickness of the first mounting portion is greater than the thickness of the second mounting portion; the upper cover plate and the lower cover plate are sequentially and detachably covered on the opening along the height direction, and when the upper cover plate is connected with the first installation part and the lower cover plate is connected with the second installation part, the lower edge of the upper cover plate is partially overlapped with the upper edge of the lower cover plate.

Optionally, the main body includes the installation strip that divides to locate the opening both sides, be provided with the backing plate on the installation strip, the length of backing plate is less than the length of installation strip is in order to form on the installation strip have the first installation department and the second installation department of thickness difference.

Optionally, the length of the backing plate is smaller than that of the upper cover plate, so that a clearance for accommodating the upper edge part of the lower cover plate is formed between the lower edge of the upper cover plate and the second mounting part when the upper cover plate is covered on the backing plate.

Optionally, the thickness of the pad is 0.2mm to 1.0mm thicker than the thickness of the lower cover plate so that a gap of 0.2mm to 1.0mm is formed at an overlapping portion of the upper cover plate and the lower cover plate.

Optionally, the backing plate includes interconnect's first connecting plate and second connecting plate, first connecting plate with the laminating of installation strip, the second connecting plate with the lateral wall laminating of main part.

Optionally, the upper cover plate and the lower cover plate are both provided with mounting holes, and the upper cover plate and the lower cover plate are both connected with the main body through fasteners penetrating through the mounting holes.

Optionally, the mounting hole comprises a first through hole and a second through hole which are communicated, and the size of the first through hole is smaller than that of the second through hole; the first through hole is positioned above the second through hole on the upper cover plate; and the first through hole is positioned below the second through hole on the lower cover plate.

Optionally, the main part includes casing, roof and bottom plate, the casing includes the three folded plate that connects gradually and encloses the cavity, the roof set up in the top of casing, the bottom plate set up in the bottom of casing.

Optionally, the upper cover plate comprises an upper panel and a first coaming, and the first coaming is connected to the edge of the upper panel except for the lower edge;

the lower cover plate comprises a lower panel and a second coaming, the second coaming is connected to the edge of the lower panel except the upper edge, and the upper edge of the upper panel of the upper cover plate and the lower edge of the first coaming surround the upper edge parts of the lower panel of the lower cover plate and the second coaming.

In addition, the utility model also provides an electrical device, which comprises an electrical control element and the shell, wherein the electrical control element is accommodated in the cavity.

In the technical scheme of the utility model, the shell achieves an effective waterproof function by constructing an overlapped surrounding structure of the upper cover plate and the lower cover plate; the cover plate fixing holes are designed into two groups of reverse gourd holes, so that the cover plate can slide only by loosening screws when being disassembled; through setting up the backing plate of specific thickness on the casing, accurate control is two apron clearance, makes the slip operation of apron smooth and easy, does not have the interference. Compared with the existing double-cover-plate shell IPX3 structure, the utility model does not involve the operations of adhering sealing strips or dispensing and the like, can simplify the manufacturing process of the cover plate, saves the cost of the shell, avoids the problem of environmental reliability of sealing materials, and greatly improves the convenience of the disassembly and assembly operation of the cover plate.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic view of a casing according to an embodiment of the present utility model;

FIG. 2 is a schematic view of the upper cover plate separated from the main body according to the embodiment of the present utility model;

FIG. 3 is a schematic view of a structure of a housing according to an embodiment of the present utility model;

fig. 4 is a schematic structural view of an upper cover plate and a lower cover plate according to an embodiment of the present utility model.

Reference numerals illustrate:

reference numerals	Name of the name	Reference numerals	Name of the name
				100	Casing of machine	162	Cavity body
1	Main body	2	Upper cover plate
				11	Mounting strip	21	Upper panel
111	A first mounting part	22	First coaming
				112	A second mounting part	3	Lower cover plate
12	Backing plate	31	Lower panel
				121	First connecting plate	32	Second coaming
122	Second connecting plate	41	Mounting hole
				13	Shell body	411	First through hole
14	Top plate	412	Second through hole
				15	Bottom plate	42	Fastening piece
161	An opening	51	Air-avoiding opening

The achievement of the objects, functional features and advantages of the present utility model will be further described with reference to the accompanying drawings, in conjunction with the embodiments.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present utility model are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture (as shown in fig. 1), and if the particular posture is changed, the directional indicator is changed accordingly.

Furthermore, descriptions such as those referred to as "first," "second," and the like, are provided for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implying an order of magnitude of the indicated technical features in the present disclosure. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present utility model, unless specifically stated and limited otherwise, the terms "connected," "affixed," and the like are to be construed broadly, and for example, "affixed" may be a fixed connection, a removable connection, or an integral body; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In addition, the technical solutions of the embodiments of the present utility model may be combined with each other, but it is necessary to be based on the fact that those skilled in the art can implement the technical solutions, and when the technical solutions are contradictory or cannot be implemented, the combination of the technical solutions should be considered as not existing, and not falling within the scope of protection claimed by the present utility model.

A cabinet generally refers to a freestanding or self-supporting enclosure or cabinet for housing power electronics, which is an integral part of the electrical equipment as a carrier for the electrical control equipment. The shell is generally made of cold-rolled steel plates, hot-galvanized plates or plastics and the like, and can play a role in protecting internal equipment from water, dust, electromagnetic interference and the like. The national standard of the people's republic of China, GB 4208-2008, protection class of housing (IP code) sets the protection class of the housing, wherein the IPX3 protection class means that the device is prevented from being harmful to the device due to the fact that water drenches into the housing within 60-degree included angle of the vertical plane.

The structure of the prior double-cover-plate shell IPX3 is mainly as follows:

the casing comprises a casing, a top plate, a bottom plate, an upper cover plate and a lower cover plate, wherein the double cover plates are fastened on the inward bending edges of the casing through screw locks. In order to achieve the IPX3 protection level, the water spray within 60 degrees of the normal included angle between the water spray and the top surface of the shell in the installation scene is prevented from entering the shell from the splicing seam of the double cover plates, and special structural design and treatment are required for the shell and the cover plates. First, the lower edge of the upper cover plate and the upper edge of the lower cover plate are bent towards the inside of the shell to form two bending surfaces. And secondly, a notch is formed in the middle part of the bent edge of the shell to be used as a mounting opening of the bent edge of the two cover plates when the cover plates are mounted.

And because an unavoidable splicing gap exists between the two bending surfaces of the upper cover plate and the lower cover plate, a sealing strip is added on the bending surface of the upper edge of the lower cover plate, and the sealing strip can be adhered on the bending surface of the cover plate by adopting foam materials such as EPDM and the like and attaching 3M double faced adhesive tape, or is adhered on the bending surface of the cover plate by adopting PU foam adhesive tape through a dispensing process. The size of the splicing seam of the double cover plates is controlled through structural design, so that the thickness compression amount of the sealing strip after the cover plates are fixed is about 40% -50%, and the IPX3 waterproof effect can be achieved. The sealing strip can also be designed on the bending surface of the lower edge of the upper cover plate, and the achieved effect is the same.

The problems and drawbacks of this structure are:

1) The manufacturing process of the cover plate (the upper cover plate and the lower cover plate) is complex. Besides necessary bending edges, a dispensing process or manual pasting of 3M glue is needed to be used on the bending surface, so that the processing time is greatly increased, and the requirement on dispensing precision or manual pasting quality is high, so that the manufacturing cost of the process is generally high.

2) The sealing strip has the defect of environmental resistance and reliability. The stability of foam or foam material is closely related to the environment. Under the application environment of high temperature and high humidity, high air salt fog content or strong illumination, the sealing strip often has failure phenomena such as fracture, pulverization, falling off and the like in the service life period of the whole product.

3) The convenience of operation when the cover plate is mounted to the housing is poor. Because the thickness of the sealing strip needs to be compressed, the sealing material is filled in the whole splicing seam after the cover plates are fixed, after one cover plate is fixed, the other cover plate needs to be pressed by pushing force when being installed, and meanwhile, the cover plate is fastened on the shell by using screws. The ease of operation of the assembly process is poor.

In view of the above, the present utility model provides a housing.

As shown in fig. 1 to 3, in an embodiment of the present utility model, a casing 100 includes a main body 1, an upper cover 2 and a lower cover 3, wherein the main body 1 forms a cavity 162 having an opening 161 at one side, and the main body 1 includes a first mounting portion 111 and a second mounting portion 112, and a thickness of the first mounting portion 111 is greater than a thickness of the second mounting portion 112; the upper cover plate 2 and the lower cover plate 3 are sequentially detachably covered on the opening 161 in the height direction, and when the upper cover plate 2 is connected with the first mounting portion 111 and the lower cover plate 3 is connected with the second mounting portion 112, the lower edge of the upper cover plate 2 partially overlaps the upper edge of the lower cover plate 3.

In this embodiment, after the upper cover plate 2 and the lower cover plate 3 are fixed, the lower edge of the upper cover plate 2 protrudes from the upper edge of the lower cover plate 3 and forms an overlapping surrounding area when viewed from the front projection direction of the casing 100, that is, in the front projection direction of the casing 100 of the present utility model, there is no splice seam between the two cover plates (between the upper cover plate 2 and the lower cover plate 3), so that water sprayed within 60 ° of the normal angle with the top surface cannot enter the casing 100 from the cover plates, and in the present utility model, the casing 100 surrounds the interior of the casing 100 by tile-shaped overlapping so that water sprayed at the IPX3 level cannot enter the interior of the casing 100.

Because the sealing strip structure is canceled in the utility model, the sealing performance is not limited by the service life of the sealing strip, thereby being applicable to different working environments. And the upper cover plate 2 and the lower cover plate 3 with preset shapes are produced and processed according to the specification without adhering sealing strips on the upper cover plate 2 or the lower cover plate 3, so that the processing time is reduced, and the production cost is controlled. The compression of the sealing strips is not needed to be considered in the assembly process, and only the upper cover plate 2 and the lower cover plate 3 are required to be installed according to the position precision requirement. Thereby simplifying the assembly steps. The assembly difficulty is reduced, and the convenience of assembly is improved.

The main body 1 includes a housing 13, a top plate 14 and a bottom plate 15, the housing 13 includes three folded plates sequentially connected to form a cavity 162, the top plate 14 is disposed at the top of the housing 13, and the bottom plate 15 is disposed at the bottom of the housing 13. Here, the three folded plates can be divided into a back plate and side plates according to the positions, and the shell 13 is formed by bending a whole plate to form the back plate and the two side plates; the top plate 14 and the bottom plate 15 are respectively located at the top end and the bottom end of the housing 13, and the top plate 14 and the bottom plate 15 are respectively riveted with the top end and the bottom end of the back plate, and simultaneously, two side edges of the top plate 14 and the bottom plate 15 are respectively riveted with the two side plates, so that the top plate 14, the bottom plate 15 and the housing 13 are riveted and assembled into the housing 13 with the front opening 161. The casing 13 adopts an integral structure to ensure the integral strength, and meets the use strength of the frame. The main body 1 is formed by splicing the shell 13, the top plate 14 and the bottom plate 15, the separate processing is more convenient and less costly than the unitary body 1. And the assembly is convenient, even if one of them part damages, also accessible renew the part and restore, its part interchangeability is strong.

Of course, the housing 13, the top plate 14 and the bottom plate 15 may be connected by other methods, and the connection method of the three is not limited in this application.

In one embodiment, the main body 1 includes mounting bars 11 disposed on two sides of the opening 161, the mounting bars 11 are provided with a pad 12, and the length of the pad 12 is smaller than that of the mounting bars 11 to form a first mounting portion 111 and a second mounting portion 112 with a thickness difference on the mounting bars 11.

It is easy to understand that the folded edges of the left and right edges of the opening 161 form the mounting bar 11, and the pad 12 is provided on the upper half of the mounting bar 11 such that the mounting bar 11 of the upper half forms the first mounting portion 111 having a slightly thicker thickness with the pad 12, thereby forming a thickness difference with the lower half of the mounting bar 11 where the pad 12 is not provided.

In one embodiment, the length of the pad 12 is smaller than the length of the upper cover plate 2, so that a clearance 51 for accommodating the upper edge portion of the lower cover plate 3 is formed between the lower edge of the upper cover plate 2 and the second mounting portion 112 when the upper cover plate 2 is mounted on the pad 12.

It will be readily appreciated that the length of the backing plate 12 is slightly shorter than the length of the upper cover plate 2 so that when the upper cover plate 2 is placed over the backing plate 12, a clearance 51 is formed between the lower edge of the upper cover plate 12 and the second mounting portion 112 to accommodate the upper edge portion of the lower cover plate 3. The assembly order of the upper cover plate 2 and the lower cover plate 3 is not considered when the assembly is performed. If the lower cover plate 3 is assembled first, the lower edge of the upper cover plate 2 can be directly covered on the upper edge of the lower cover plate 3; if the upper cover plate 2 is assembled first, the upper edge of the lower cover plate 3 can be directly inserted into the clearance opening 51.

Specifically, the first mounting portion 111 is formed in a mode that the pad 12 is raised, and for cover plates with different thicknesses, the pad 12 with different thicknesses can be selected to be matched with the casing 100. In general, the thickness of the pad 12 is 0.2mm to 1.0mm thicker than the plate thickness of the cover plate, i.e., a gap of 0.2mm to 1.0mm is formed at the overlapping portion of the upper cover plate 2 and the lower cover plate 3, thereby ensuring the smoothness of the sliding operation.

For example, the sheet thickness of both cover plates (upper cover plate 2 and lower cover plate 3) is 1.0mm. In the assembly process, a single cover plate is fixed firstly, and at the moment, the inner surface of the upper cover plate 2 and the outer surface of the lower cover plate 3 are not contacted or interfered when the upper cover plate 2 is installed due to the existence of a backing plate 12 with the thickness of 1.5mm, and the gap between the inner surface and the outer surface of the upper cover plate and the lower cover plate is accurately controlled to be 0.5mm. In the operation of disassembling or assembling the cover plates, the two cover plates can be disassembled or assembled independently and do not have any interference in the sliding process because the existence of the base plate 12 on the main body 1 keeps a gap of 0.5mm all the time between the two cover plates.

Further, the pad 12 includes a first connecting plate 121 and a second connecting plate 122 connected to each other, the first connecting plate 121 is attached to the mounting bar 11, and the second connecting plate 122 is attached to the side wall of the main body 1. An elongated L-shaped backing plate 12 is fixed on the bent edges of the two sides of the shell 13 by rivets, the thickness of the plate material of the backing plate 12 can be 1.5mm, and the second connecting plate 122 can cover the gap at the joint of the first connecting plate 121 and the mounting strip 11.

And, in cooperation therewith, as shown in fig. 4, the upper cover plate 2 includes an upper panel 21 and a first coaming 22, the first coaming 22 being connected to an edge of the upper panel 21 except for a lower edge; the lower cover plate 3 includes a lower panel 31 and a second coaming 32, and the second coaming 32 is attached to the edge of the lower panel 31 except for the upper edge. The first coaming 22 has three sections, namely a top section and two side sections, the top section is lapped on the top of the main body 1, and the two side sections are contacted with two second connecting plates 122; similar to the first coaming 22, the second coaming 32 has a bottom section that contacts the bottom plate 15 of the main body 1 and two side sections that contact the two side walls of the main body 1. I.e., the overlapping surrounding area of the upper cover plate 2 and the lower cover plate 3 is not only the front surface, but also both sides of the cabinet 100 have similar structures, i.e., the lower edges of the upper panel 21 and the first enclosing plate 22 of the upper cover plate 2 surround the upper edge portions of the lower panel 31 and the second enclosing plate 32 of the lower cover plate 3, thereby preventing rainwater from entering the interior of the cabinet 100 from the cover plate joints on both sides of the cabinet 100.

In other embodiments, the protruding structure may be integrally formed on the upper half of the mounting strip 11, so as to achieve the thickness difference between the protruding structure integrally formed on the upper half and the protruding structure not integrally formed on the lower half of the mounting strip 11, so as to control the gap between the two cover plates, so that the sliding operation of the cover plates is smooth and has no interference.

In an embodiment, the upper cover plate 2 and the lower cover plate 3 are provided with mounting holes 41, and the upper cover plate 2 and the lower cover plate 3 are connected with the main body 1 through fasteners 42 penetrating the mounting holes 41. Namely, the upper cover plate 2 and the lower cover plate 3 are detachably connected with the main body 1 through the fasteners 42 respectively, and a certain gap is always kept between the double cover plates due to the existence of the upper base plate 12 of the shell 13, so that the double cover plates can be independently detached or assembled back without any interference in the detaching and installing processes. Wherein a set screw may be used for the fastener 42.

Based on the above embodiment, the mounting hole 41 includes the first through hole 411 and the second through hole 412 that communicate, the size of the first through hole 411 is smaller than the size of the second through hole 412; wherein, on the upper cover plate 2, the first through hole 411 is located above the second through hole 412; on the lower cover plate 3, the first through hole 411 is located below the second through hole 412. That is, the first through hole 411 and the second through hole 412 are gourd holes and are symmetrically arranged, for example, the lower edge of the upper cover plate 2 and the upper edge of the lower cover plate 3 are both flat and have no bending surface, the mounting hole 41 of the upper cover plate 2 is a positive gourd hole, the mounting hole 41 of the lower cover plate 3 is an inverted gourd hole, a single cover plate is fixed in the assembly process, and when the lower cover plate 3 is assembled and fixed in advance, at this time, due to the existence of the base plate 12, the inner surface of the upper cover plate 2 and the outer surface of the lower cover plate 3 are not contacted or interfered when the upper cover plate 2 is installed.

When the cover plate is required to be disassembled in use, the fixing screw of the cover plate is loosened and lifted appropriately, and the cover plate can be removed without disassembling the screw. Specifically, for the upper cover plate 2: after loosening the screws, the upper cover plate 2 is slid upwards until the screws can completely pass through the gourd holes, and then the upper cover plate 2 can be taken down; for the lower cover plate 3: after loosening the screws, the lower cover plate 3 is slid downwards until the screws can completely pass through the gourd holes, and then the lower cover plate 3 can be taken down. The sliding distance is generally equal to the waist length of the gourd hole. Similarly, when the cover plate is assembled back, only the operation process of disassembly is needed, namely, the screw is aligned and passes through the hoist hole on the cover plate, then the cover plate is slid into place, and finally the fixing screw is locked. In the operation of disassembling or assembling the cover plates, the gap between the two cover plates is always kept between 0.2mm and 1mm due to the existence of the base plate 12 on the shell 13, so that the two cover plates can be independently disassembled or assembled without any interference in the sliding process.

In addition, the utility model also provides an electrical device, which comprises an electrical control element and the casing 100, wherein the electrical control element is accommodated in the cavity 162. Since the electrical device includes the housing 100 as described above, the electrical device has all the advantages of the housing 100 described above, which is not described in detail.

The foregoing description is only of the preferred embodiments of the present utility model and is not intended to limit the scope of the utility model, and all equivalent structural changes made by the specification and drawings of the present utility model or direct/indirect application in other related technical fields are included in the scope of the present utility model.

Claims (10)

1. A housing, the housing comprising:

the main body is provided with a cavity with an opening at one side, and comprises a first mounting part and a second mounting part, wherein the thickness of the first mounting part is larger than that of the second mounting part;

the upper cover plate and the lower cover plate are detachably covered on the opening in sequence along the height direction, and the lower edge of the upper cover plate is partially overlapped with the upper edge of the lower cover plate when the upper cover plate is connected with the first installation part and the lower cover plate is connected with the second installation part.

2. The cabinet of claim 1, wherein the main body comprises mounting bars provided at both sides of the opening, wherein a pad is provided on the mounting bars, and a length of the pad is smaller than a length of the mounting bars to form the first and second mounting portions having a thickness difference on the mounting bars.

3. The cabinet of claim 2, wherein the pad has a length smaller than that of the upper cover plate such that a space is formed between a lower edge of the upper cover plate and the second mounting portion when the upper cover plate is mounted on the pad, and an upper edge portion of the lower cover plate is received therein.

4. The cabinet of claim 2, wherein the thickness of the pad is 0.2mm to 1.0mm thicker than the thickness of the lower cover plate such that a gap of 0.2mm to 1.0mm is formed at an overlapping portion of the upper cover plate and the lower cover plate.

5. The cabinet of claim 2, wherein the pad includes a first connection plate and a second connection plate connected to each other, the first connection plate being attached to the mounting bar, the second connection plate being attached to a side wall of the main body.

6. The cabinet of any one of claims 1 to 5, wherein each of the upper cover plate and the lower cover plate is provided with a mounting hole, and each of the upper cover plate and the lower cover plate is connected to the main body by a fastener penetrating the mounting hole.

7. The cabinet of claim 6, wherein the mounting hole comprises a first through hole and a second through hole that are communicated, and a size of the first through hole is smaller than a size of the second through hole; wherein,

the first through hole is positioned above the second through hole on the upper cover plate; and the first through hole is positioned below the second through hole on the lower cover plate.

8. The cabinet of any one of claims 1 to 5, wherein the main body comprises a housing, a top panel and a bottom panel, the housing comprising three flaps connected in sequence to enclose the cavity, the top panel being disposed at a top of the housing, the bottom panel being disposed at a bottom of the housing.

9. The cabinet of any one of claims 1 to 5, wherein the upper cover panel includes an upper panel and a first shroud, the first shroud being coupled to an edge of the upper panel except a lower edge;

the lower cover plate comprises a lower panel and a second coaming, the second coaming is connected to the edge of the lower panel except the upper edge, and the upper edge of the upper panel of the upper cover plate and the lower edge of the first coaming surround the upper edge parts of the lower panel of the lower cover plate and the second coaming.

10. An electrical device comprising an electrical control element and a housing according to any one of claims 1 to 9, the electrical control element being housed within the cavity.