Shell structure and inverter

Abstract

The present invention discloses a housing structure and a frequency converter, wherein the housing structure comprises: a base, wherein the base has a mounting groove with a top opening, and an operating window connected to the mounting groove is arranged on the side of the base; a mounting frame, wherein the mounting frame is detachably covered at the top opening of the mounting groove, and the bottom of the mounting frame has a first positioning surface, and the distance from the first positioning surface to the bottom of the mounting groove is adapted to the thickness of a 3p air switch, and a convex hull structure is detachably arranged at the first positioning surface, and the bottom of the convex hull structure has a second positioning surface, and the distance from the second positioning surface to the bottom of the mounting groove is adapted to the thickness of a 2p air switch; and a limiting structure, wherein the limiting structure comprises at least two first limiting protrusions spaced apart at the bottom of the mounting groove and used to limit the left and right movement of the air switch, and at least two second limiting protrusions spaced apart at the bottom of the mounting groove and used to limit the forward and backward movement of the air switch. The above-mentioned housing structure is compatible with 2p air switches and 3p air switches.

Description

Technical Field

[0001] The present invention relates to the technical field of frequency converters, and in particular to a housing structure and a frequency converter. Background Art

[0002] In the prior art, the inverter usually requires an external air switch to protect the circuit. Since the line of the external air switch is often restricted by the installation environment, the difficulty of wiring is increased. For this reason, there are some inverters with integrated air switches on the market. However, the types of air switches required in different working environments are different. Specifically, a 2p air switch (two-pole air switch) is required in a working environment with a voltage of 220V, and a 3p air switch (three-pole air switch) is required in a working environment with a voltage of 380V. In view of the different size specifications of 2p air switches and 3p air switches, which are specifically reflected in the different thicknesses of the two, these inverters with integrated air switches need to design shell structures of different specifications for air switches of different specifications, which increases the production cost of the inverter and reduces the production efficiency of the inverter. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a housing structure that is compatible with 2p air switches and 3p air switches, which is beneficial to reducing the production cost of the frequency converter and improving the production efficiency of the frequency converter.

[0004] The present invention also provides a frequency converter having the above-mentioned housing structure.

[0005] According to the first aspect of the present invention, the shell structure of the embodiment includes: a base, the base has a mounting groove with a top opening, the mounting groove is used to install the air switch, and the side of the base is provided with an operating window connected to the mounting groove corresponding to the operating handle of the air switch; a mounting frame, the mounting frame is detachably covered at the top opening of the mounting groove, the mounting frame is used to install the circuit board, the bottom of the mounting frame has a first positioning surface, the distance from the first positioning surface to the bottom of the mounting groove is adapted to the thickness of the 3p air switch, a convex structure is detachably provided at the first positioning surface, the bottom of the convex structure has a second positioning surface, and the distance from the second positioning surface to the bottom of the mounting groove is adapted to the thickness of the 2p air switch; a limiting structure, the limiting structure is arranged corresponding to the side wall of the air switch, and the limiting structure includes at least two first limiting protrusions arranged at intervals at the bottom of the mounting groove and used to limit the left and right movement of the air switch, and at least two second limiting protrusions arranged at intervals at the bottom of the mounting groove and used to limit the forward and backward movement of the air switch.

[0006] According to the shell structure of the embodiment of the present invention, at least the following beneficial effects are achieved: when assembling a 2p air switch, first install the 2p air switch in the installation groove, and then install the mounting frame with the convex structure at the top opening of the installation groove, wherein the 2p air switch is limited to move left and right and to move forward and backward by the limiting structure, and the second positioning surface at the bottom of the convex structure cooperates with the bottom of the installation groove to limit the 2p air switch to move up and down; when assembling a 3p air switch, first install the 3p air switch in the installation groove, and then install the mounting frame with the convex structure removed at the top opening of the installation groove, wherein the 3p air switch is limited to move left and right and to move forward and backward by the limiting structure, and the first positioning surface at the bottom of the mounting frame cooperates with the bottom of the installation groove to limit the 2p air switch to move up and down; the above-mentioned shell structure is compatible with 2p air switches and 3p air switches, which is beneficial to reducing the production cost of the inverter and improving the production efficiency of the inverter.

[0007] According to some embodiments of the present invention, the convex structure is integrally formed on the mounting frame, an avoidance hole is provided at the first positioning surface corresponding to the convex structure, the upper part of the convex structure extends into the avoidance hole, and a fragile connection structure that can be destroyed by external force is formed between the upper part of the convex structure and the hole wall of the avoidance hole.

[0008] According to some embodiments of the present invention, the fragile connection structure includes a plurality of fragile connection parts that can be broken when subjected to external force, and the plurality of fragile connection parts are distributed at intervals along the side edges of the convex hull structure.

[0009] According to some embodiments of the present invention, the convex hull structure is a hollow structure with an open top.

[0010] According to some embodiments of the present invention, the limiting structure also includes a limiting protrusion arranged at the bottom of the mounting frame and used to limit the backward movement of the 3p air switch, and two third limiting protrusions arranged at intervals at the bottom of the mounting frame and used to limit the left and right movement of the 3p air switch.

[0011] According to some embodiments of the present invention, the limiting structure further includes a fourth limiting protrusion which is arranged at the lower part of the convex structure and is used to limit the backward movement of the 2p air switch.

[0012] According to some embodiments of the present invention, a cover body that can be rotatably opened and closed is provided at the operation window.

[0013] According to some embodiments of the present invention, an unlockable first locking structure is arranged between the base and the cover body, and the first locking structure can lock the cover body in a closed position. The first locking structure includes a fifth limiting protrusion, and the fifth limiting protrusion is arranged on the side edge of the free end of the cover body. A limiting hole or a limiting groove in which the fifth limiting protrusion can be inserted is arranged at the operating window corresponding to the fifth limiting protrusion, and a handle groove for opening the cover body is arranged on the side edge of the free end of the cover body.

[0014] According to some embodiments of the present invention, an unlockable second locking structure is provided between the base and the cover body, the second locking structure can lock the cover body in a preset open position, the second locking structure includes a sixth limiting protrusion, the sixth limiting protrusion is provided on a side of the cover body connected to the base, an elastic buckle is provided at the operating window corresponding to the sixth limiting protrusion, when the cover body is rotated to the preset open position, the sixth limiting protrusion can cooperate with the elastic buckle to limit the closing of the cover body.

[0015] The frequency converter according to the second aspect of the present invention comprises the housing structure according to the first aspect of the present invention.

[0016] The inverter according to the embodiment of the present invention has at least the following beneficial effects: the application of the above-mentioned shell structure makes the inverter compatible with 2p air switches and 3p air switches, which is beneficial to reducing the production cost of the inverter and improving the production efficiency of the inverter.

[0017] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0019] Figure 1 is a schematic structural diagram of a housing structure according to an embodiment of the present invention;

[0020] Figure 2 yes Figure 1 A partial enlarged schematic diagram in the middle;

[0021] Figure 3 yes Figure 1 A partial enlarged schematic diagram of point B in the middle;

[0022] Figure 4 is a schematic structural diagram of a base according to an embodiment of the present invention;

[0023] Figure 5 yes Figure 4 A partial enlarged schematic diagram of point C in the middle;

[0024] Figure 6 yes Figure 4 The partial enlarged schematic diagram of point D in the middle;

[0025] Figure 7 is a schematic structural diagram of a mounting frame according to an embodiment of the present invention;

[0026] Figure 8 yes Figure 7 The local enlarged schematic diagram of point E in the middle;

[0027] Fig. 9 yes Figure 7 A partial enlarged schematic diagram of point F in the middle;

[0028] Fig.10 is an exploded schematic diagram of a housing structure according to an embodiment of the present invention;

[0029] Fig.11 yes Fig.10 A partial enlarged schematic diagram of the G in the middle;

[0030] Fig.12 yes Fig.10 A partial enlarged schematic diagram of the H in the middle;

[0031] Fig.13 It is a cross-sectional schematic diagram of the housing structure of the embodiment of the present invention when a 2p air switch is assembled;

[0032] Fig.14 yes Fig.13 The local enlarged schematic diagram of point I in the middle;

[0033] Fig.15 yes Fig.13 A partial enlarged schematic diagram of the J in the middle;

[0034] Fig.16 It is a cross-sectional schematic diagram of the housing structure of the embodiment of the present invention when a 3p air switch is assembled;

[0035] Fig.17 yes Fig.16 A partial enlarged schematic diagram of point K in the middle.

[0036] Reference numerals:

[0037] Base 100, mounting groove 110, operating window 120, first limiting protrusion 130, second limiting protrusion 140, limiting hole 150, elastic buckle 160, mounting frame 200, first positioning surface 210, convex structure 220, second positioning surface 221, fourth limiting protrusion 222, avoidance hole 230, fragile connection part 240, limiting convex edge 250, third limiting protrusion 260, cover body 300, elastic part 310, fifth limiting protrusion 311, handle groove 320, sixth limiting protrusion 330. DETAILED DESCRIPTION

[0038] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0039] In the description of the present invention, it is necessary to understand that if it involves orientation description, the orientation or position relationship indicated by, for example, up, down, front, back, left, right, etc. is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0040] In the description of the present invention, if the words such as several, greater than, less than, exceed, above, below, within, etc. appear, among which, several means one or more, more means more than two, greater than, less than, exceed, etc. are understood as not including the number itself, and above, below, within, etc. are understood as including the number itself.

[0041] In the description of the present invention, if the words "first", "second", etc. appear, they are only used to distinguish the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0042] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0043] Reference Figure 1 , Figure 4 , Figure 5 , Figure 6 , Figure 7 and Fig.10 The shell structure according to the embodiment of the present invention includes a base 100, a mounting frame 200 and a limiting structure.

[0044] The base 100 has a mounting groove 110 with a top opening, and the mounting groove 110 is used to install the air switch. The side of the base 100 is provided with an operating window 120 connected to the mounting groove 110 corresponding to the operating handle of the air switch. The mounting frame 200 is detachably covered at the top opening of the mounting groove 110. The mounting frame 200 is used to install the circuit board. The bottom of the mounting frame 200 has a first positioning surface 210. The distance from the first positioning surface 210 to the bottom of the mounting groove 110 is adapted to the thickness of the 3p air switch. A convex structure 220 is detachably provided at the first positioning surface 210. The bottom of the convex structure 220 has a second positioning surface 221. The second positioning surface 221 to the mounting The distance at the bottom of the groove 110 is adapted to the thickness of the 2p air switch, and the limiting structure is set corresponding to the side wall of the air switch. The limiting structure includes at least two first limiting protrusions 130 spaced apart at the bottom of the mounting groove 110 and used to limit the left and right movement of the air switch, and at least two second limiting protrusions 140 spaced apart at the bottom of the mounting groove 110 and used to limit the forward and backward movement of the air switch. Specifically, the first limiting protrusion 130 is set corresponding to the left and right walls of the air switch, and the second limiting protrusion 140 is set corresponding to the front and rear side walls of the air switch. The first limiting protrusion 130 and the second limiting protrusion 140 can cooperate with each other to clamp the air switch.

[0045] When assembling a 2p air switch, first install the 2p air switch in the mounting groove 110, and then install the mounting frame 200 with the convex structure 220 at the top opening of the mounting groove 110, wherein the 2p air switch is limited to move left and right and to move forward and backward by the limiting structure, and the second positioning surface 221 at the bottom of the convex structure 220 cooperates with the bottom of the mounting groove 110 to limit the 2p air switch to move up and down. When assembling a 3p air switch, first install the 3p air switch in the mounting groove 110, and then install the mounting frame 200 with the convex structure 220 removed at the top opening of the mounting groove 110, wherein the 3p air switch is limited to move left and right and to move forward and backward by the limiting structure, and the first positioning surface 210 at the bottom of the mounting frame 200 cooperates with the bottom of the mounting groove 110 to limit the 2p air switch to move up and down. The above-mentioned shell structure is compatible with 2p air switches and 3p air switches, which is beneficial to reducing the production cost of the inverter and improving the production efficiency of the inverter.

[0046] It should be noted that, in some of the embodiments, the mounting frame 200 is connected to the base 100 by screws. Of course, the mounting frame 200 can also be installed on the base 100 by a snap-on structure, which is not limited here.

[0047] Reference Figure 1 and Figure 2In some embodiments, the convex structure 220 is integrally formed on the mounting frame 200, and an avoidance hole 230 is provided at the first positioning surface 210 corresponding to the convex structure 220. The upper part of the convex structure 220 extends into the avoidance hole 230, and a fragile connection structure that can be destroyed by external force is formed between the upper part of the convex structure 220 and the hole wall of the avoidance hole 230. During production and processing, only one set of molds is needed to process the mounting frame 200 with the convex structure 220, which is beneficial to further reduce the production cost of the inverter, and at the same time reduces the production and processing procedures, which is beneficial to further improve the production efficiency of the inverter.

[0048] Reference Figure 2 In some of the embodiments, the fragile connection structure includes a plurality of fragile connection parts 240 that can be broken by external force. The plurality of fragile connection parts 240 are spaced apart along the side edges of the convex hull structure 220. The structure is simple and can be formed in one step using a mold without the need for secondary processing. The convex hull structure 220 is also easy to remove.

[0049] It should be noted that, in some other embodiments, the fragile connection structure can also be an annular connection portion formed between the convex structure and the hole wall of the avoidance hole, and the annular connection portion is secondary processed with cuts so that the annular connection portion can be destroyed when subjected to external force, which is not limited here.

[0050] It should be noted that, in some other embodiments, the fragile connection structure may also be disposed between the top of the convex structure and the first positioning surface, which is not limited here.

[0051] It should be noted that, in some other embodiments, the convex structure can also be detachably disposed on the first positioning surface by means of screws or a clamping structure, which is not limited here.

[0052] Reference Figure 1 and Figure 2 In some of the embodiments, the convex structure 220 is a hollow structure with an open top, which is helpful in saving materials and thus helps to further reduce the production cost of the inverter.

[0053] Reference Figures 7 to 11 as well as Fig.16 and Fig.17 In some embodiments, the limiting structure also includes a limiting convex edge 250 arranged at the bottom of the mounting frame 200 and used to limit the backward movement of the 3p air switch, and two third limiting protrusions 260 arranged at intervals at the bottom of the mounting frame 200 and used to limit the left and right movement of the 3p air switch, which is beneficial to enhance the limiting effect of the 3p air switch.

[0054] Reference Figures 7 to 11 as well as Fig.14 and Fig.15In some of the embodiments, the limiting structure also includes a fourth limiting protrusion 222 disposed at the lower portion of the convex structure 220 and used to limit the backward movement of the 2p air switch, which is beneficial to enhancing the limiting effect on the 2p air switch.

[0055] Reference Figure 1 , Figure 4 and Fig.10 In some of the embodiments, a cover 300 that can be rotatably opened and closed is provided at the operation window 120 .

[0056] Reference Figure 1 , Figure 3 , Figure 6 , Fig.10 and Fig.12 In some embodiments, an unlockable first locking structure is provided between the base 100 and the cover 300, and the first locking structure can lock the cover 300 in a closed position. The first locking structure includes a fifth limiting protrusion 311, and the fifth limiting protrusion 311 is provided on the side edge of the free end of the cover 300. A limiting hole 150 for the fifth limiting protrusion 311 to be inserted is provided at the operation window 120 corresponding to the fifth limiting protrusion 311. A handle groove 320 for opening the cover 300 is provided at the side edge of the free end of the cover 300, which is helpful to prevent the cover 300 in the closed position from being accidentally opened due to external factors such as vibration or collision. Specifically, an inclined guide surface is provided on the fifth limiting protrusion 311 to facilitate opening or closing the cover 300.

[0057] It should be noted that, in some other embodiments, the limiting hole 150 may also be replaced by a limiting groove, which is not limited here.

[0058] Reference Figure 3 and Fig.12 In some embodiments, the side edge of the cover body 300 is provided with an elastic portion 310 that can undergo elastic deformation when subjected to external force, and a fifth limiting protrusion 311 is provided on the elastic portion 310 to facilitate opening or closing the cover body 300, and at the same time helps to reduce the gap between the cover body 300 and the base 100.

[0059] Reference Fig.13 and Fig.15In some embodiments, an unlockable second locking structure is provided between the base 100 and the cover 300, and the second locking structure can lock the cover 300 in a preset open position. The second locking structure includes a sixth limiting protrusion 330, which is provided on a side of the cover 300 connected to the base 100. An elastic buckle 160 is provided at the operation window 120 corresponding to the sixth limiting protrusion 330. When the cover 300 is rotated to the preset open position, the sixth limiting protrusion 330 can cooperate with the elastic buckle 160 to limit the cover 300 from closing, so that the user will not be disturbed by the cover 300 when pulling the operating handle of the air switch. Specifically, an arc-shaped guide surface is provided on the sixth limiting protrusion 330 corresponding to the elastic buckle 160 to facilitate opening or closing of the cover 300.

[0060] The frequency converter according to the embodiment of the present invention includes the above-mentioned housing structure. The above-mentioned housing structure is applied so that the frequency converter can be compatible with 2p air switches and 3p air switches, which is beneficial to reducing the production cost of the frequency converter and improving the production efficiency of the frequency converter.

[0061] In the description of this specification, if the description involves reference terms such as "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples" and "some examples", it means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0062] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A housing structure, characterized in that: include: A base (100), the base (100) having a mounting groove (110) with a top opening, the mounting groove (110) being used to mount an air switch, and an operating window (120) communicating with the mounting groove (110) being provided on a side of the base (100) corresponding to an operating handle of the air switch; A mounting frame (200), the mounting frame (200) being detachably covered at the top opening of the mounting groove (110), the mounting frame (200) being used to mount a circuit board, the bottom of the mounting frame (200) being provided with a first positioning surface (210), the distance from the first positioning surface (210) to the bottom of the mounting groove (110) being adapted to the thickness of a 3p air switch, a convex structure (220) being detachably provided at the first positioning surface (210), the bottom of the convex structure (220) being provided with a second positioning surface (221), the distance from the second positioning surface (221) to the bottom of the mounting groove (110) being adapted to the thickness of a 2p air switch; A limiting structure, the limiting structure is arranged corresponding to the side wall of the air switch, the limiting structure includes at least two first limiting protrusions (130) arranged at intervals at the bottom of the installation groove (110) and used to limit the left and right movement of the air switch, and at least two second limiting protrusions (140) arranged at intervals at the bottom of the installation groove (110) and used to limit the front and rear movement of the air switch.

2. The housing structure according to claim 1, characterized in that: The convex structure (220) is integrally formed on the mounting frame (200); an avoidance hole (230) is provided at the first positioning surface (210) corresponding to the convex structure (220); the upper part of the convex structure (220) extends into the avoidance hole (230); and a fragile connection structure that can be destroyed by external force is formed between the upper part of the convex structure (220) and the hole wall of the avoidance hole (230).

3. The housing structure according to claim 2, characterized in that: The fragile connection structure comprises a plurality of fragile connection parts (240) that can be broken when subjected to external force, and the plurality of fragile connection parts (240) are distributed at intervals along the side edge of the convex hull structure (220).

4. The housing structure according to claim 1, characterized in that: The convex hull structure (220) is a hollow structure with an open top.

5. The housing structure according to claim 1, characterized in that: The limiting structure also includes a limiting convex edge (250) arranged at the bottom of the mounting frame (200) and used to limit the backward movement of the 3p air switch, and two third limiting protrusions (260) arranged at intervals at the bottom of the mounting frame (200) and used to limit the left and right movement of the 3p air switch.

6. The housing structure according to claim 1, characterized in that: The limiting structure also includes a fourth limiting protrusion (222) which is arranged at the lower part of the convex structure (220) and is used to limit the backward movement of the 2p air switch.

7. The housing structure according to claim 1, characterized in that: The operating window (120) is provided with a cover body (300) that can be rotatably opened and closed.

8. The housing structure according to claim 7, characterized in that: An unlockable first locking structure is provided between the base (100) and the cover body (300), and the first locking structure is capable of locking the cover body (300) in a closed position. The first locking structure comprises a fifth limiting protrusion (311), and the fifth limiting protrusion (311) is provided on the side edge of the free end of the cover body (300). A limiting hole (150) or a limiting groove into which the fifth limiting protrusion (311) can be inserted is provided at the operation window (120) corresponding to the fifth limiting protrusion (311), and a handle groove (320) for opening the cover body (300) is provided at the side edge of the free end of the cover body (300).

9. The housing structure according to claim 7, characterized in that: An unlockable second locking structure is provided between the base (100) and the cover body (300), and the second locking structure can lock the cover body (300) in a preset open position. The second locking structure includes a sixth limiting protrusion (330), and the sixth limiting protrusion (330) is provided on a side of the cover body (300) connected to the base (100). An elastic buckle (160) is provided at the operation window (120) corresponding to the sixth limiting protrusion (330). When the cover body (300) is rotated to the preset open position, the sixth limiting protrusion (330) can cooperate with the elastic buckle (160) to limit the cover body (300) from closing.

10. A frequency converter, characterized in that: The invention comprises a housing structure as claimed in any one of claims 1 to 9.

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