Motor junction box assembly

Abstract

According to the motor junction box assembly, a junction box is connected to the peripheral face of a motor base, a junction frame and a fixing frame used for fixing a capacitor are arranged in the junction box, the fixing frame comprises a bottom plate, side plates are arranged at the positions, opposite to the side plate edges, of the bottom plate, and the side plates and the bottom plate define a containing groove used for containing the capacitor. The bottom plate and / or the side plates are attached to the inner box face of the junction box, the contact area of the fixing frame and the junction box is greatly increased, the capacitor can rapidly conduct heat to the box body of the junction box through the contact heat conduction capacity of the fixing frame and dissipate the heat outwards, and the heat dissipation effect of the capacitor in the junction box is effectively improved.

Description

Technical Field

[0001] The utility model relates to a motor, in particular to a motor junction box assembly. Background Art

[0002] Motors typically have a junction box for connecting the power cord and motor windings. Inside this box, a terminal block is installed for connecting the motor's terminal blocks. Single-phase motors also have capacitors that provide power to keep the motor running. To facilitate wiring, some technologies integrate the capacitors within the junction box.

[0003] The patent document entitled "A Motor Junction Box" (CN103516112A, hereinafter referred to as Document 1) discloses a technical solution comprising a motor housing and a capacitor box mounted on the outer wall of the motor housing. The capacitor box comprises a box body and a mounting surface. The mounting surface is an arc-shaped surface that mates with the cylindrical surface of the motor housing. The mounting surface is provided with mounting holes, and the side of the box body has outlet holes. This solution integrates the junction box and capacitor box, allowing the same box to be used for both capacitor storage and wiring, resulting in a more compact structure.

[0004] The technical solution disclosed in the patent document entitled "Motor Starting Capacitor Junction Box" (document number CN204992887U, hereinafter referred to as Document 2) includes a box body and a cover body. The cover body is fixedly connected to the box body. A capacitor clamp is provided in the box body. The clamp includes a fixed column, an arc-shaped contact portion, and an arc-shaped limit portion. The fixed column is arranged on the box body, the arc-shaped contact portion is arranged on the fixed column, and the arc-shaped limit portion is arranged at one end of the fixed column away from the box body. The arc-shaped contact portion and the arc-shaped limit portion are concentrically arranged, and a buffer gap is provided between the arc-shaped contact portion and the arc-shaped limit portion.

[0005] When the motor is operating, current flows through the capacitor, causing it to heat up to a certain degree. This heating can be more pronounced if the capacitor is operating for extended periods, under heavy load, or if the capacitor itself is of poor quality. In Reference 2, the contact area between the clamp holding the capacitor and the junction box is small, and the majority of the heat generated by the capacitor is conducted through air heat conduction to the box, which then dissipates it outward. However, air heat conduction has poor heat transfer capabilities, and the capacitor's heat dissipation is ineffective, potentially leading to overheating. This can affect the capacitor's performance and lifespan, and in severe cases, can indirectly damage the motor. Summary of the Invention

[0006] The utility model provides a motor junction box assembly, which improves the structural design of a capacitor fixing frame, enhances the contact heat conduction capability of the fixing frame, and further enhances the heat dissipation effect of the capacitor.

[0007] In order to achieve the above-mentioned purpose, the technical solution adopted is: a motor junction box assembly, the junction box is connected to the outer peripheral surface of the motor base, and a junction frame and a fixing frame for fixing the capacitor are arranged inside the junction box. The fixing frame includes a bottom plate, and side plates are arranged at the opposite side plate edges of the bottom plate. The side plates and the bottom plate are arranged to form a accommodating groove for accommodating the capacitor, and the bottom plate and / or the side plates are arranged in contact with the inner box surface of the junction box.

[0008] Compared with the prior art, the technical effect of the present invention is as follows: the bottom plate and side plates of the fixing frame in the junction box are arranged to form a accommodating groove for accommodating the capacitor, and the bottom plate and / or side plates are arranged in close contact with the inner box surface of the junction box, which greatly increases the contact area between the fixing frame and the junction box. The capacitor can quickly conduct its own heat to the box body of the junction box through the contact heat conduction ability of the fixing frame and dissipate it outward, effectively improving the heat dissipation effect of the capacitor in the junction box. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 This is a schematic diagram of the three-dimensional appearance of the utility model;

[0010] Figure 2 Schematic diagram of the internal structure of the junction box;

[0011] Figure 3 This is a schematic diagram of wire insertion;

[0012] Figure 4 is a structural diagram of the fixing frame;

[0013] Figure 5 for Figure 4 K-direction view in;

[0014] Figure 6 for Figure 1 AA section view in . DETAILED DESCRIPTION

[0015] The following is combined with Figure 1-6 And related content, the utility model is further described in detail:

[0016] A motor terminal box assembly is disclosed. The terminal box 10 is connected to the outer peripheral surface of the motor base 20. The terminal box 10 is internally provided with a terminal frame 40 and a fixing frame 60 for fixing a capacitor 30. The fixing frame 60 includes a bottom plate 61. Side plates 62 are provided at the side edges opposite to the bottom plate 61. The side plates 62 and the bottom plate 61 are arranged to form a receiving groove 63 for accommodating the capacitor 30. The bottom plate 61 and / or the side plates 62 are arranged to fit the inner surface of the terminal box 10. Here, the capacitor 30 is connected to the terminal frame 40 by a wire 50. The terminal frame 40 is provided to connect the capacitor 30 to the wiring terminals inside the motor to form an electrical connection.

[0017] In the above scheme, the bottom plate 61 and the side plates 62 of the fixing frame 60 in the junction box 10 are arranged to form a receiving groove 63 for accommodating the capacitor 30. The bottom plate 61 and / or the side plates 62 are arranged in contact with the inner box surface of the junction box 10, which greatly increases the contact area between the fixing frame 60 and the junction box 10. The capacitor 30 can quickly conduct its own heat to the box body of the junction box 10 through the contact heat conduction ability of the fixing frame 60 and dissipate it outward, effectively improving the heat dissipation effect of the capacitor 30 in the junction box 10.

[0018] As a preferred embodiment, the bottom of the junction box 10 is formed by the housing area of ​​the motor base 20 enclosed by the box wall of the junction box 10 on the motor base 20. The side panel surface of the bottom plate 61 adjacent to the motor base 20 is curved and fits with the outer peripheral surface of the motor base 20. The side plate 62 fits with the box wall of the junction box 10. In this embodiment, the bottom of the junction box 10 is directly formed by the housing area of ​​the motor base 20 enclosed by the box wall of the junction box 10 on the motor base 20. On the one hand, it reduces obstruction and facilitates the connection between the internal components of the junction box 10 and the interior of the motor. On the other hand, the metal housing of the motor generally has a good heat dissipation effect. By directly fitting the bottom plate 61 of the fixing frame 60 to the housing of the motor base 20 for heat conduction, the capacitor 30 transfers its own heat to the motor base 20 through the fixing frame 60. By utilizing the heat dissipation advantage of the housing of the motor base 20, the interior of the junction box 10 can be quickly cooled.

[0019] Furthermore, the bottom surface of the accommodating groove 63 is arranged to fit the circumference of the capacitor 30. The bottom surface of the accommodating groove 63 is an arc surface that fits the circumference of the capacitor 30, thereby increasing the contact area between the capacitor 30 and the fixing frame 60, so that the heat generated by the capacitor 30 can be quickly transferred to the fixing frame 60, and then quickly transferred from the fixing frame 60 to the junction box 10, indirectly improving the heat dissipation effect.

[0020] In the present application, it is taken into consideration that most of the current single-phase motors have 1-2 capacitors. For this reason, the slot length direction of the accommodating groove 63 is arranged along the axial direction of the motor, and the accommodating groove 63 is divided into two by a partition 64 arranged in the middle thereof to form two slot cavities for accommodating the capacitor 30, and the plate surface of the partition 64 and the side plate 62 are parallel to the axial direction of the motor. The capacitor 30 is placed in the accommodating groove 63 and separated by the partition 64, so as to facilitate the connection and fixation of each capacitor 30 separately, and meet the installation requirements of multiple capacitors 30 (it should be noted that in this solution, the fixing frame 60 is not limited to having only two slot cavities for accommodating the capacitor 30. Multiple partitions 64 can be arranged at intervals to form a slot cavity unit of more than two accommodating grooves 63).

[0021] Specifically, the middle portion of the bottom plate 61 is an arc-shaped plate 61a that fits snugly against the outer shell of the motor base 20. The edge portions 61b of the arc-shaped plate 61a on the opposite sides of the motor base 20 in the circumferential direction extend along the circumference of the capacitor 30 within the accommodating groove 63 to connect with the side plate 62. While ensuring a uniform thickness throughout the bottom plate 61, the bottom plate 61 not only fits snugly against the outer shell of the motor base 20 but also forms a good contact fit with the capacitor 30, ensuring that the bottom plate 61 has relatively good contact heat transfer capabilities, allowing the capacitor 30 to transfer and dissipate heat to the outer shell of the motor base 20 as much as possible through the bottom plate 61.

[0022] Furthermore, to prevent the capacitor 30 from freely moving in the depth direction of the groove after being placed in the groove 63, the side panels 62 and the partition 64 are provided with ridges 65 arranged along the length of the groove 63. The ridges 65 are clamped onto the circumference of the capacitor 30 in the groove 63. The clamping and limiting effect of the ridges 65 restricts the free movement of the capacitor 30, thereby preventing the capacitor 30 from escaping from the notch of the groove 63 and affecting the connection stability of the capacitor 30 and other components. On this basis, the connection stability of the capacitor 30 on the fixing frame 60 can also be enhanced by adhesive.

[0023] In addition, combined Figure 2 、 Figure 3 as well as Figure 4 As shown, to prevent the capacitor 30 from freely moving along the length of the accommodating slot 63 and thus affecting the installation stability of the capacitor 30, a baffle 66 is provided on one side of the bottom plate 61 located along the width of the accommodating slot 63. The plate surface of the baffle 66 located on the side where the capacitor 30 is located cooperates with the wall of the opposite terminal box 10 to limit the displacement of the capacitor 30 in the axial direction of the motor, thereby preventing the capacitor 30 from freely moving along the length of the accommodating slot 63. The free movement of the capacitor 30 in the width direction is limited by the two opposing side plates 62 and the partition 64, which, in conjunction with the limiting effect of the ridges 65 along the depth direction, achieve a comprehensive limiting effect on the capacitor 30 and ensure the stability of the capacitor 30 on the fixing frame 60.

Claims

1. A motor junction box assembly, wherein the junction box (10) is connected to the outer peripheral surface of the motor base (20), and the junction box (10) is provided with a junction frame (40) and a fixing frame (60) for fixing a capacitor (30), characterized in that: The fixing frame (60) includes a bottom plate (61), and side plates (62) are provided at the side edges of the bottom plate (61). The side plates (62) and the bottom plate (61) are arranged to form a receiving groove (63) for accommodating the capacitor (30). The bottom plate (61) and / or the side plates (62) are arranged to fit the inner box surface of the junction box (10).

2. The motor junction box assembly according to claim 1, characterized in that: The bottom of the junction box (10) is composed of a housing area of ​​the motor base (20) surrounded by the box wall of the junction box (10) on the motor base (20); a side plate surface of the bottom plate (61) adjacent to the motor base (20) is arc-shaped and fits with the outer peripheral surface of the motor base (20); and the side plate (62) is arranged in a fit with the box wall of the junction box (10).

3. The motor junction box assembly according to claim 1 or 2, characterized in that: The bottom surface of the accommodating groove (63) is an arc surface that fits closely with the peripheral surface of the capacitor (30).

4. The motor junction box assembly according to claim 2, characterized in that: The length direction of the accommodating groove (63) is arranged along the axial direction of the motor. The accommodating groove (63) is divided into two by a partition (64) arranged in the middle thereof to form two groove cavities for accommodating the capacitor (30). The plate surfaces of the partition (64) and the side plate (62) are parallel to the axial direction of the motor.

5. The motor junction box assembly according to claim 4, characterized in that: The middle portion of the bottom plate (61) is an arc-shaped plate (61a) that fits the outer shell of the motor base (20), and the plate edge portion (61b) of the arc-shaped plate (61a) on the opposite side in the circumferential direction of the motor base (20) is connected to the side plate (62) along the circumferential surface of the capacitor (30) in the accommodating groove (63).

6. The motor junction box assembly according to claim 4, characterized in that: The side plates (62) and the partition plates (64) are provided with convex strips (65) arranged along the length direction of the accommodating groove (63) on the opposite side plate surfaces. The convex strips (65) are clamped on the peripheral surface of the capacitor (30) in the accommodating groove (63).

7. The motor junction box assembly according to claim 6, characterized in that: A baffle (66) is provided on one side of the bottom plate (61) located in the width direction of the accommodating groove (63); the plate surface of the baffle (66) located on the side where the capacitor (30) is located and the box wall of the opposite junction box (10) form a limiting fit to limit the displacement of the capacitor (30) in the axial direction of the motor.

Images