Single-phase motor junction box

Abstract

The utility model provides a single-phase motor junction box, and belongs to the technical field of motors. The problem that an existing junction box is complex in structure is solved. The single-phase motor junction box comprises a rectangular box body, a box cover and two bottom feet, the upper ends of the bottom feet are connecting parts, the four corners of the top wall of the box body are recessed downwards to form vertically-arranged connecting grooves, the top wall of the box body is further provided with protruding baffle rings, and the connecting grooves are located on the outer sides of the baffle rings; a guide groove is formed in the inner wall of the box cover, and the baffle ring is inserted into the guide groove to form sealing. Vertically-penetrating threaded holes are formed in the bottom walls of the connecting grooves, four upper through holes are correspondingly formed in the box cover, and lower through holes are correspondingly formed in the two ends of the two connecting parts; each upper through hole is internally provided with an upper bolt which is screwed into the upper end of the corresponding threaded hole to fix the box body and the box cover, and each lower through hole is internally provided with a lower bolt which is screwed into the lower end of the corresponding threaded hole to fix the box body and the connecting part. The single-phase motor junction box is simple in structure.

Description

Technical Field

[0001] This utility model belongs to the field of motor technology, and relates to a single-phase motor, and more particularly to a single-phase motor junction box. Background Technology

[0002] The motor junction box is a key component on the outside of the motor used to connect the power cord and the windings, and it has functions of electrical connection, protection and maintenance.

[0003] Existing stand-alone junction boxes generally include a box body, a cover, a heat sink, and feet. The heat sink is installed at the bottom of the box body for overall heat dissipation of the junction box; the feet are also installed at the bottom of the box body for overall positioning of the junction box.

[0004] In the aforementioned junction box, the box body and cover, as well as the box body and base, are all fixed with screws. Considering cost, the box body is typically made of plastic, thus requiring multiple threaded inserts to meet connection requirements. These numerous threaded inserts not only complicate the overall structure but also hinder manufacturing. Utility Model Content

[0005] The purpose of this invention is to address the aforementioned problems in existing technologies by proposing a simple single-phase motor junction box.

[0006] The objective of this utility model can be achieved through the following technical solution: A single-phase motor junction box includes a rectangular box body, a box cover matching the box body, and two bottom feet located below the box body. The upper end of the bottom feet is a horizontally arranged and elongated connecting part, and the length of the connecting part extends along the width direction of the box body. The box body's top wall has four recessed corners forming vertically arranged connecting grooves. The top wall also has a protruding retaining ring, which is coaxially arranged with the box body, and the connecting groove is located outside the retaining ring. The inner wall of the box cover has a guide groove matching the retaining ring, and the retaining ring is inserted into the guide groove to form a seal. The bottom wall of the connecting groove has a vertically penetrating threaded hole. The box cover has four corresponding upper through holes, and both ends of the two connecting parts have corresponding lower through holes. Each upper through hole has an upper bolt that is screwed into the upper end of the corresponding threaded hole to fix the box body and the box cover, and each lower through hole has a lower bolt that is screwed into the lower end of the corresponding threaded hole to fix the box body and the connecting part.

[0007] The upper and lower bolts at the corresponding positions share a single threaded hole, which reduces the number of threaded holes on the box body during actual design, simplifying the structure and facilitating processing.

[0008] In the aforementioned single-phase motor junction box, the box body includes a main body made of plastic material and four cylindrical metal inserts. The four metal inserts are respectively embedded in the bottom wall of four connection slots, and the inner holes of the metal inserts are the aforementioned threaded holes. By adopting this design, while ensuring a stable connection between the box body, cover, and base, the weight and cost of the junction box can be significantly reduced.

[0009] In the aforementioned single-phase motor junction box, the metal insert and the main body are fixed together by heat fusion. During assembly, the metal insert is first heated, then pressed into the bottom wall of the connecting groove. After cooling, the metal insert and the bottom wall of the connecting groove are tightly bonded together to form a whole.

[0010] In the aforementioned single-phase motor junction box, an annular toothed portion coaxial with the metal insert is formed on the outer wall of the metal insert to further improve the bonding strength between the metal insert and the box body.

[0011] In the aforementioned single-phase motor junction box, each metal insert has at least two axially distributed annular teeth.

[0012] In the aforementioned single-phase motor junction box, a ring-shaped rubber pad is provided inside the guide groove, and a retaining ring presses against the rubber pad to form a more reliable seal between the retaining ring and the guide groove, thereby achieving better waterproof and dustproof effects.

[0013] In the aforementioned single-phase motor junction box, a heat sink is also horizontally fixed at the bottom of the box, and the heat sink is located between the two bottom feet to accelerate the heat dissipation of the junction box.

[0014] In the aforementioned single-phase motor junction box, the heat sink consists of a base plate and a row of fins formed on the bottom of the base plate. Both ends of the base plate are clamped and positioned between the bottom wall of the box and the top wall of the corresponding connecting part. The base plate is clamped and positioned by the box and the connecting part, thus eliminating the need for additional components for base plate positioning and further simplifying the structure.

[0015] In the aforementioned single-phase motor junction box, the base plate is provided with clearance holes for the lower bolt rod to pass through. The number of clearance holes and the lower bolt are the same and their positions correspond one-to-one.

[0016] Compared with existing technologies, this single-phase motor junction box has the following advantages:

[0017] 1. The upper and lower bolts at the corresponding positions share a single threaded hole. This reduces the number of threaded holes on the box body during actual design, simplifying the structure and facilitating processing.

[0018] 2. The heat sink substrate is clamped and positioned by the box and the connecting part, so that the substrate positioning does not require additional parts, thus further simplifying the structure. Attached Figure Description

[0019] Figure 1 This is a 3D schematic diagram of the junction box for this single-phase motor.

[0020] Figure 2 This is a 3D schematic diagram of the single-phase motor junction box after the cover has been removed.

[0021] Figure 3 This is a cross-sectional view of the junction box for this single-phase motor.

[0022] Figure 4 This is a schematic diagram of the structure of a metal insert.

[0023] In the diagram, 1. Box body; 1a. Connecting groove; 1b. Retaining ring; 1c. Metal insert; 1c1. Threaded hole; 1c2. Annular toothed part; 1d. Main body; 2. Box cover; 2a. Guide groove; 2b. Upper through hole; 3. Base foot; 3a. Connecting part; 4. Cable connector; 5. Upper bolt; 6. Lower bolt; 7. Heat sink; 7a. Base plate; 7b. Fin; 8. Rubber pad. Detailed Implementation

[0024] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0025] like Figure 1 As shown, this single-phase motor junction box includes a rectangular box body 1, a box cover 2 that matches the box body 1, and two base feet 3 located below the box body 1. The two base feet 3 are distributed along the length of the rectangular box body 1 and are arranged symmetrically.

[0026] Specifically

[0027] The two wide side walls of the box 1 have horizontally penetrating inlet and outlet holes respectively. Cable connectors 4 are installed at both the inlet and outlet holes, and the cable connectors 4 are usually threaded.

[0028] The base 3 is a one-piece structure, elongated in shape and extending along the width of the box 1. The vertical cross-section of the base 3 is approximately "Z"-shaped. The upper end of the base 3 has a horizontally positioned, elongated connecting portion 3a, extending along the width of the box 1. The lower end of the base 3 has a horizontally positioned, elongated positioning portion, also extending along the width of the box 1. The positioning portion has multiple vertically penetrating bolt holes to facilitate the positioning and installation of the junction box via the base 3.

[0029] like Figures 1 to 3As shown, the four corners of the top wall of the box body 1 are recessed downwards to form vertically arranged connecting grooves 1a. The top wall of the box body 1 also has a protruding retaining ring 1b, which is coaxially arranged with the box body 1, and the connecting grooves 1a are located outside the retaining ring 1b. The inner wall of the box cover 2 has a guide groove 2a that matches the retaining ring 1b, and the retaining ring 1b is inserted into the guide groove 2a to form a seal. The bottom wall of the connecting groove 1a has a vertically penetrating threaded hole 1c1, and the box cover 2 has four corresponding upper through holes 2b, which are also located outside the retaining ring 1b. Each of the two connecting parts 3a has a corresponding lower through hole at both ends, that is, each connecting part 3a has a lower through hole at its end; each upper through hole 2b has an upper bolt 5 that is screwed into the upper end of the corresponding threaded hole 1c1 to fix the box body 1 and the box cover 2; each lower through hole has a lower bolt 6 that is screwed into the lower end of the corresponding threaded hole 1c1 to fix the box body 1 and the connecting part 3a.

[0030] The upper bolt 5 and the lower bolt 6, which are located at the same position, share a threaded hole 1c1. This reduces the number of threaded holes 1c1 on the box body 1 in actual design, thus simplifying the structure and facilitating processing.

[0031] In this embodiment,

[0032] like Figures 2 to 4 As shown, the box 1 includes a main body 1d made of plastic material and four cylindrical metal inserts 1c. The connecting groove 1a and the retaining ring 1b are both formed on the main body 1d; the four metal inserts 1c are respectively embedded in the bottom wall of the four connecting grooves 1a, and the inner hole of the metal insert 1c is the aforementioned threaded hole 1c1. Using this design, while ensuring a stable connection between the box 1, the cover 2, and the base 3, the weight and cost of the junction box can be greatly reduced.

[0033] In the actual product, the metal insert 1c and the main body 1d are fixed together by heat fusion. During assembly, the metal insert 1c is first heated, then pressed into the bottom wall of the connecting groove 1a. After cooling, the metal insert 1c and the bottom wall of the connecting groove 1a are tightly bonded together to form a whole. Further, the outer wall of the metal insert 1c is formed with annular teeth 1c2 coaxial with the metal insert 1c to further improve the bonding strength between the metal insert 1c and the housing 1. Each metal insert 1c has at least two axially distributed annular teeth 1c2. Preferably, the number of annular teeth 1c2 is two.

[0034] The installation method of the cover 2 is as follows: the type of the upper through hole 2b is a stepped hole, the bottom edge of the cover 2 is pressed on the top edge of the box body 1, and the head of the upper bolt 5 is pressed on the inner wall of the stepped hole.

[0035] like Figure 1 and Figure 3As shown, a heat sink 7 is horizontally fixed at the bottom of the box 1, and the heat sink 7 is located between the two base feet 3 to accelerate heat dissipation of the junction box. The heat sink 7 consists of a base plate 7a and a row of fins 7b formed on the bottom of the base plate 7a. Both ends of the base plate 7a are clamped and positioned between the bottom wall of the box 1 and the top wall of the corresponding connecting part 3a. At this time, the top and bottom walls of the base plate 7a press against the bottom wall of the box 1 and the top wall of the connecting part 3a, respectively. The base plate 7a is clamped and positioned by the box 1 and the connecting part 3a, thus eliminating the need for additional components to further simplify the structure. Specifically, the base plate 7a has clearance holes for the lower bolt 6 to pass through. The number of clearance holes and the lower bolt 6 are the same and their positions correspond one-to-one. At this time, the head of the lower bolt 6 presses against the bottom wall of the connecting part 3a.

[0036] like Figure 2 As shown, a ring-shaped rubber gasket 8 is provided inside the guide groove 2a, and a retaining ring 1b presses against the rubber gasket 8 to form a more reliable seal between the retaining ring 1b and the guide groove 2a, resulting in better waterproof and dustproof effects. Naturally, the retaining ring 1b can also achieve a seal between the two by being fastened within the guide groove 2a.

[0037] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A single-phase motor junction box, comprising a rectangular box body (1), a box cover (2) matching the box body (1), and two base feet (3) disposed below the box body (1), wherein the upper end of the base feet (3) is a horizontally arranged and elongated connecting portion (3a), and the length of the connecting portion (3a) extends along the width direction of the box body (1), characterized in that, The top wall of the box body (1) is recessed at all four corners to form vertically arranged connecting grooves (1a). The top wall of the box body (1) also has a protruding retaining ring (1b). The retaining ring (1b) and the box body (1) are coaxially arranged, and the connecting groove (1a) is located outside the retaining ring (1b). The inner wall of the box cover (2) is provided with a guide groove (2a) that matches the retaining ring (1b), and the retaining ring (1b) is inserted into the guide groove (2a) to form a seal. The bottom wall of the connecting groove (1a) has a vertically penetrating groove. The box cover (2) has four upper through holes (2b) and two lower through holes at both ends of the two connecting parts (3a). Each upper through hole (2b) is provided with an upper bolt (5) that is screwed into the upper end of the corresponding threaded hole (1c1) to fix the box body (1) and the box cover (2). Each lower through hole is provided with a lower bolt (6) that is screwed into the lower end of the corresponding threaded hole (1c1) to fix the box body (1) and the connecting part (3a).

2. The single-phase motor junction box according to claim 1, characterized in that, The aforementioned box (1) includes a main body (1d) made of plastic material and four cylindrical metal inserts (1c). The four metal inserts (1c) are respectively embedded in the bottom wall of the four connecting grooves (1a), and the inner hole of the metal insert (1c) is the aforementioned threaded hole (1c1).

3. The single-phase motor junction box according to claim 2, characterized in that, The metal insert (1c) and the main body (1d) are fixed together by heat fusion.

4. The single-phase motor junction box according to claim 3, characterized in that, The outer wall of the metal insert (1c) is formed with an annular toothed portion (1c2) that is coaxial with the metal insert (1c).

5. The single-phase motor junction box according to claim 4, characterized in that, Each metal insert (1c) has at least two axially distributed annular teeth (1c2).

6. The single-phase motor junction box according to claim 1, characterized in that, The guide groove (2a) is provided with an annular rubber pad (8), and the retaining ring (1b) presses against the rubber pad (8).

7. The single-phase motor junction box according to claim 1, characterized in that, The bottom of the box (1) is also horizontally fixed with a heat sink (7), and the heat sink (7) is located between the two bottom feet (3).

8. The single-phase motor junction box according to claim 7, characterized in that, The heat sink (7) consists of a substrate (7a) and a row of fins (7b) formed on the bottom of the substrate (7a), and both ends of the substrate (7a) are clamped and positioned between the bottom wall of the box (1) and the top wall of the corresponding connecting part (3a).

9. The single-phase motor junction box according to claim 8, characterized in that, The substrate (7a) is provided with clearance holes for the rod of the lower bolt (6) to pass through. The number of clearance holes and the lower bolt (6) are the same and their positions correspond one-to-one.

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