A protection mechanism for a frequency converter

Abstract

This utility model discloses a protection mechanism for a frequency converter, including a front cover and a rear housing with a rectangular opening, a sealing assembly between the rectangular openings of the front cover and the rear housing, and a wiring assembly mounted on the rear housing. The sealing assembly includes a rectangular sealing ring with a U-shaped cross-section, and a rectangular convex ring extending in the same direction as the rectangular sealing ring. The rectangular convex ring is fitted into an annular sealing groove. A wiring hole is provided at the lower end of the rear housing. The wiring assembly includes a wiring tube and a sealing plug. A through-hole is provided at the center of the sealing plug. The sealing plug and the wiring tube are interference-fitted to compress and deform the sealing plug, forcing the through-hole to gradually narrow and eventually close or tend to close. The sealing assembly and the wiring assembly respectively form a complete seal between the front cover and the rear housing, and between the wiring harness and the wiring hole, preventing dust or moisture from contacting the frequency converter in the rear housing, thus improving the safety and practicality of the frequency converter.

Description

Technical Field

[0001] This utility model relates to the field of frequency converter protection technology, specifically a protection mechanism for frequency converters. Background Technology

[0002] Inverters play a vital role in many electrical equipment fields. The inverter housing typically includes a rear housing with an opening and a front cover that seals the opening. The rear housing also has a wiring groove for threading wires. In the current use of inverters, the sealing connection between the front cover and the rear housing, and between the wiring harness and the wiring groove, is insufficient. This allows dust and water to enter the interior of the inverter's rear housing, which can lead to the inverter bursting during startup. This not only easily damages electrical appliances but also poses a significant safety hazard. Summary of the Invention

[0003] The purpose of this utility model is to provide a protection mechanism for a frequency converter. By setting a sealing component between the front cover and the rear housing and a wiring component at the wiring pipe position, a full seal effect is formed between the front cover and the rear housing, and between the wiring harness and the wiring hole. This prevents dust or moisture from coming into contact with the frequency converter in the rear housing due to insufficient sealing, thereby improving the safety and practicality of the frequency converter.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0005] This utility model provides a protection mechanism for a frequency converter, including:

[0006] The front cover and the rear housing having a rectangular opening, including a sealing assembly between the rectangular openings of the front cover and the rear housing, and a wiring assembly mounted on the rear housing;

[0007] The end face of the rear housing with a rectangular opening is the opening end face, and an annular sealing groove is provided on the opening end face to surround the rectangular opening. The sealing assembly includes a rectangular sealing ring with a U-shaped cross-section, and a rectangular convex ring extending in the same direction as the rectangular sealing ring is provided on the rectangular sealing ring. The rectangular convex ring is matched and installed in the annular sealing groove. The front cover is connected to the rear housing and seals the rectangular opening, and a sealed connection is formed between the front cover and the rear housing through the rectangular sealing ring.

[0008] The lower end of the rear housing has a wiring hole. The wiring assembly includes a wiring tube installed in the wiring hole and a sealing plug fitted in the wiring tube. A wire-passing groove is provided through the center of the sealing plug. The sealing plug and the wiring tube are interference fit to compress the sealing plug and deform it, forcing the wire-passing groove to gradually narrow and eventually close or tend to close.

[0009] Preferably, the conduit includes an outwardly extending and gradually narrowing tapered external thread section, with a sealing plug interference-fitted within the tapered external thread section. The outer wall of the tapered external thread section has several circumferentially distributed through grooves extending in a strip shape. Between every two adjacent through grooves, an arc-shaped spring with external threads is formed. The tapered external thread section is threadedly connected to a drive nut with a tapered internal thread section. The drive nut engages with the tapered external thread section and compresses the arc-shaped spring, bending it inward to deform the sealing plug. Thus, as the drive nut rotates, multiple arc-shaped springs create a clamping force on the sealing plug, causing the conduit groove to gradually close.

[0010] Preferably, the conduit also includes a circular tube section integrally connected to the inner end of the tapered external thread section, and the sealing plug includes a cylindrical section and a tapered section, which are respectively interference-fitted into the circular tube section and the tapered external thread section.

[0011] Preferably, the outer end of the sealing plug is integrally connected with an elastic annular sealing flange, the drive nut has an inner hole, a tapered internal thread section is formed on the inner wall of the inner hole, and an inner annular groove is also formed on the inner wall of the inner hole near the outer end of the drive nut. When the drive nut and the tapered external thread section are threaded into place, the annular sealing flange elastically deforms and is interference-fitted in the inner annular groove, further improving the sealing effect.

[0012] Preferably, the inner end of the circular pipe section is integrally connected to an annular limiting part located inside the rear housing. The annular limiting part is symmetrically provided with circumferential limiting grooves, and the inner wall of the rear housing is provided with corresponding limiting blocks. The limiting blocks are matched and installed in the circumferential limiting grooves to prevent the circular pipe section from moving circumferentially.

[0013] Preferably, the outer wall of the circular pipe section is provided with a circular sealing groove coaxially, and a circular sealing ring is installed in the circular sealing groove and located in the wiring hole; so that a sealed connection is formed between the circular pipe section and the rear housing.

[0014] Preferably, the number of wiring holes is one or more, and the number of wiring components matches the number of wiring holes.

[0015] Preferably, the through groove extends along the length of the tapered external thread section and passes through the outer end of the tapered external thread section, making it easier for each arc-shaped spring to elastically deform inward.

[0016] Preferably, the front cover includes a cover plate that blocks a rectangular opening, with multiple side plates extending downward around the perimeter of the cover plate, the multiple side plates and the cover plate enclosing the sealing assembly; preventing dust and debris from contacting the sealing assembly.

[0017] Preferably, the outer wall of the rear housing is provided with an annular connecting plate near the rectangular opening, and the front cover is provided with an annular eaves extending horizontally outward. The annular connecting plate and the annular eaves are fastened together by a number of screws.

[0018] The beneficial effects of this utility model are as follows:

[0019] This invention achieves a good seal between the front cover and the rear housing through a rectangular sealing ring and a rectangular convex ring, thus creating a good dustproof and waterproof effect between the front cover and the rear housing. At the same time, when the wiring harness is inserted into the rear housing through the wiring assembly at the wiring tube position, it can be threaded to the tapered external thread section through the drive nut, and the arc-shaped spring sheet is forced to deform, so that the sealing plug is in close contact with the wire, which also creates a good dustproof and waterproof effect. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the protection mechanism of a frequency converter provided in an embodiment of the present utility model.

[0022] Figure 2 This is a schematic diagram of the rear shell structure in this utility model.

[0023] Figure 3 for Figure 2 A magnified view of A in the middle.

[0024] Figure 4 This is a schematic diagram of the front cover structure in this utility model.

[0025] Figure 5 for Figure 4 A magnified view of B in the middle.

[0026] Figure 6 This is a schematic diagram of the wiring assembly in this utility model.

[0027] Figure 7 for Figure 6 Vertical sectional view.

[0028] Figure 8 This is a schematic diagram of the circular pipe section in this utility model.

[0029] Figure 9 This is a schematic diagram of the structure of the driving nut in this utility model.

[0030] Figure 10 This is a schematic diagram of the sealing plug in this utility model.

[0031] Explanation of reference numerals in the attached drawings: 1-Front cover, 11-Annular cornice, 2-Rear housing, 21-Annular sealing groove, 22-Wiring hole, 23-Annular connecting plate, 3-Rectangular sealing ring, 31-Rectangular convex ring, 4-Connecting pipe, 41-Circular pipe section, 411-Circular sealing groove, 412-Circular sealing ring, 42-Conical external thread section, 421-Through groove, 422-Arc-shaped spring, 43-Annular limiting part, 431-Circumferential limiting groove, 5-Sealing plug, 51-Wire groove, 52-Sealing plate, 6-Drive nut, 61-Inner ring groove. Detailed Implementation

[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0033] The specific embodiments of this utility model are as follows:

[0034] like Figure 1-10 As shown, this embodiment provides a protection mechanism for a frequency converter, including:

[0035] The front cover 1 and the rear housing 2 with a rectangular opening are provided. The rear housing 2 is a rectangular box-shaped structure. The inverter is installed inside the rear housing 2. The protection mechanism also includes a sealing assembly between the rectangular opening of the front cover 1 and the rear housing 2, and a wiring assembly installed on the rear housing 2.

[0036] like Figure 1-5 As shown, the end face of the rear housing 2 with a rectangular opening is the opening end face, and an annular sealing groove 21 surrounding the rectangular opening is provided on the opening end face. The sealing assembly includes a rectangular sealing ring 3 with a U-shaped cross-section. A rectangular convex ring 31 extending in the same direction as the rectangular sealing ring 3 is provided on the rectangular sealing ring 3. The rectangular convex ring 31 and the rectangular sealing ring 3 are integrally formed. The rectangular convex ring 31 is matched and installed in the annular sealing groove 21. The front cover 1 is connected to the rear housing 2 and seals the rectangular opening, so that a sealed connection is formed between the front cover 1 and the rear housing 2 through the rectangular sealing ring 3.

[0037] The lower end of the rear housing 2 is provided with a wiring hole 22 for threading wire harnesses. The number of wiring holes 22 can be single or multiple. The number of wiring assemblies matches the number of wiring holes 22. The wiring assembly includes a wiring tube 4 installed in the wiring hole 22 and a sealing plug 5 fitted in the wiring tube 4. The sealing plug 5 can undergo elastic deformation under external force and is usually made of rubber material. A wire-passing groove 51 is provided through the center of the sealing plug 5. The sealing plug 5 and the wiring tube 4 are interference fit to compress the sealing plug 5 and deform it, forcing the wire-passing groove 51 to gradually narrow and eventually close or tend to close, so that the rear housing 2 completely protects the inverter inside.

[0038] Furthermore, such as Figure 6-10 As shown, the interference fit structure is as follows: the connector 4 includes a tapered external thread section 42 that extends outward and gradually narrows, and the sealing plug 5 is interference-fitted within the tapered external thread section 42; the outer wall of the tapered external thread section 42 has several through grooves 421 evenly distributed circumferentially, the through grooves 421 extending in a strip shape, and an arc-shaped spring piece 422 with external threads is formed between every two adjacent through grooves 421; the tapered external thread section 42 is threadedly connected to a drive nut 6 with a tapered internal thread section, and the drive nut 6 is threadedly engaged with the tapered external thread section 42. As the thread engagement length increases, the drive nut 6 compresses the arc-shaped spring piece 422 to bend inward, thereby compressing the sealing plug 5 to deform; thus, as the drive nut 6 rotates, the multiple arc-shaped spring pieces 422 form a clamping force on the sealing plug 5, thereby causing the connector groove 51 to gradually close.

[0039] Furthermore, the cross-sectional shape of the wiring hole 22 is circular. Therefore, the wiring pipe 4 also includes a circular pipe section 41 integrally connected to the inner end of the tapered external thread section 42. The circular pipe section 41 passes through the wiring hole 22 into the interior of the rear housing 2. The sealing plug 5 includes a cylindrical section and a tapered section. The cylindrical section and the tapered section are respectively interference-fitted into the circular pipe section 41 and the tapered external thread section 42.

[0040] Furthermore, to ensure a good sealing connection between the wiring conduit 4 and the drive nut 6, an elastic annular sealing flange 52 is integrally connected to the outer end of the sealing plug 5. The drive nut 6 has an inner hole, and a tapered internal thread section 42 is formed on the inner wall of the inner hole. An inner annular groove 61 is also formed on the inner wall of the inner hole near the outer end of the drive nut 6. When the drive nut 6 and the tapered external thread section 42 are threaded into place, the annular sealing flange 52 elastically deforms and is interference-fitted in the inner annular groove 61, thereby further improving the sealing effect.

[0041] Furthermore, the circular tube segment 41 that penetrates into the rear housing 2 needs to be kept circumferentially fixed. Therefore, the inner end of the circular tube segment 41 is integrally connected to an annular limiting part 43 located inside the rear housing 2 and abutting against the corresponding side wall of the rear housing 2. The annular limiting part 43 is symmetrically provided with circumferential limiting grooves 431, and the inner wall of the rear housing 2 is provided with corresponding limiting blocks. The limiting blocks are matched and installed in the circumferential limiting grooves 431 to prevent the circular tube segment 41 from moving circumferentially, so that during processing, workers can use welding or screw fixing methods to fix the circular tube segment 41 to the rear housing 2.

[0042] Furthermore, to ensure the sealing between the circular pipe section 41 and the wiring hole 22, a circular sealing groove 411 is coaxially formed on the outer wall of the circular pipe section 41. A circular sealing ring 412 is installed in the circular sealing groove 411 and is located in the wiring hole 22. The circular sealing ring 412 seals the gap between the circular pipe section 41 and the inner wall of the wiring hole 22, so that a sealed connection is formed between the circular pipe section 41 and the rear housing 2.

[0043] Furthermore, in order to make the arc-shaped spring piece 422 more easily bend and deform inward after being subjected to pressure, in this embodiment the through groove 421 extends along the length direction of the tapered external thread section 42 and passes through the outer end of the tapered external thread section 42, so that there is no connecting part between each two arc-shaped spring pieces 422, so that each arc-shaped spring piece 422 can more easily deform inward elastically.

[0044] Furthermore, to ensure the sealing effect and service life of the rectangular sealing ring 3 and the rectangular convex ring 31, the front cover 1 includes a cover plate that blocks the rectangular opening. The edges of the cover plate extend downward and form multiple side plates. The multiple side plates and the cover plate enclose the sealing components, namely the rectangular sealing ring 3 and the rectangular convex ring 31, to prevent dust and debris from contacting the sealing components.

[0045] Furthermore, the connection structure between the front cover 1 and the rear housing 2 is as follows: the outer wall of the rear housing 2 is provided with an annular connecting plate 23 near the rectangular opening, and the front cover 1 is provided with an annular eaves plate 11 extending outward horizontally around it. The annular eaves plate 11 is formed by extending outward from the side plate, and the annular connecting plate 23 and the annular eaves plate 11 are fastened together by several screws.

[0046] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.

Claims

1. A protection mechanism for a frequency converter, comprising a front cover (1) and a rear housing (2) having a rectangular opening, characterized in that, It also includes a sealing assembly between the rectangular openings of the front cover (1) and the rear housing (2), and a wiring assembly mounted on the rear housing (2); The rear housing (2) has a rectangular opening at one end face, which is the opening end face. An annular sealing groove (21) is provided on the opening end face to surround the rectangular opening. The sealing assembly includes a rectangular sealing ring (3) with a U-shaped cross-section. A rectangular convex ring (31) extending in the same direction as the rectangular sealing ring (3) is provided on the rectangular sealing ring (3). The rectangular convex ring (31) is matched and installed in the annular sealing groove (21). The front cover (1) is connected to the rear housing (2) and seals the rectangular opening. A sealed connection is formed between the front cover (1) and the rear housing (2) through the rectangular sealing ring (3). The lower end of the rear housing (2) is provided with a wiring hole (22). The wiring assembly includes a wiring tube (4) installed in the wiring hole (22) and a sealing plug (5) fitted in the wiring tube (4). A wire groove (51) is provided through the center of the sealing plug (5). The sealing plug (5) and the wiring tube (4) are interference fit to compress the sealing plug (5) to deform, forcing the wire groove (51) to gradually narrow and eventually close or tend to close.

2. The protection mechanism for a frequency converter as described in claim 1, characterized in that, The conduit (4) includes a tapered external thread section (42) that extends outward and gradually narrows. The sealing plug (5) is interference-fitted into the tapered external thread section (42). The outer wall of the tapered external thread section (42) is evenly distributed with several through grooves (421) that extend in a strip shape. An arc-shaped spring piece (422) with external threads is formed between every two adjacent through grooves (421). The tapered external thread section (42) is threadedly connected to a drive nut (6) with a tapered internal thread section. The drive nut (6) is threadedly engaged with the tapered external thread section (42) and squeezes the arc-shaped spring piece (422) to bend inward, so as to squeeze the sealing plug (5) to deform.

3. The protection mechanism for a frequency converter as described in claim 2, characterized in that, The conduit (4) also includes a round pipe section (41) integrally connected to the inner end of the tapered external thread section (42). The sealing plug (5) includes a cylindrical section and a tapered section, which are respectively interference-fitted into the round pipe section (41) and the tapered external thread section (42).

4. The protection mechanism for a frequency converter as described in claim 2, characterized in that, The outer end of the sealing plug (5) is integrally connected with an elastic annular sealing flange (52). The drive nut (6) has an inner hole, and a tapered internal thread section (42) is opened on the inner wall of the inner hole. An inner ring groove (61) is also opened on the inner wall of the inner hole near the outer end of the drive nut (6). When the drive nut (6) and the tapered external thread section (42) are threaded into place, the annular sealing flange (52) is elastically deformed and interference-fitted in the inner ring groove (61).

5. The protection mechanism for a frequency converter as described in claim 3, characterized in that, The inner end of the circular tube section (41) is integrally connected to an annular limiting part (43) located in the rear housing (2). The annular limiting part (43) is symmetrically provided with circumferential limiting grooves (431). The inner wall of the rear housing (2) is provided with corresponding limiting blocks. The limiting blocks are matched and installed in the circumferential limiting grooves (431).

6. The protection mechanism for a frequency converter as described in claim 5, characterized in that, The outer wall of the circular pipe section (41) is coaxially provided with an annular sealing groove (411), and an annular sealing ring (412) is installed in the annular sealing groove (411) and located in the wiring hole (22).

7. The protection mechanism for a frequency converter as described in claim 1, characterized in that, The number of wiring holes (22) is one or more, and the number of wiring components matches the number of wiring holes (22).

8. The protection mechanism for a frequency converter as described in claim 2, characterized in that, The through groove (421) extends along the length of the tapered external thread section (42) and passes through the outer end of the tapered external thread section (42).

9. The protection mechanism for a frequency converter as described in claim 1, characterized in that, The front cover (1) includes a cover plate that seals a rectangular opening, with the edges of the cover plate extending downward and forming multiple side plates, which together with the cover plate enclose the sealing assembly.

10. The protection mechanism for a frequency converter as described in claim 1, characterized in that, The outer wall of the rear housing (2) is provided with an annular connecting plate (23) near the rectangular opening, and the front cover (1) is provided with an annular eaves plate (11) extending outward horizontally around it. The annular connecting plate (23) and the annular eaves plate (11) are fastened together by several screws.

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