Contact box

Abstract

The utility model discloses a contact box. The contact box comprises a box body and a static contact, the middle of the box body is a cavity, the bottom of the cavity is open, and at least one heat dissipation hole is formed in the top of the box body. The fixed contact comprises a fixed part, an extension part connected to the fixed part and a mounting seat embedded in the fixed part, and the extension part penetrates through the top of the box body and extends into the cavity; the heat dissipation holes are located in the peripheral side of the static contact. The contact box provided by the utility model has the characteristics of simple structure and good heat dissipation, and can solve the problem that the heat dissipation effect of the contact box is not ideal.

Description

Technical Field

[0001] This utility model relates to the field of electrical equipment, and in particular to a contact box. Background Technology

[0002] Contact boxes are essential key electrical components of complete switchgear. Conventional contact boxes are installed and fixed inside the switch cabinet, which usually leads to difficulties in heat dissipation and excessive temperature rise, posing safety hazards during long-term operation. Referring to the published patent CN104953476A, the top of the existing contact box is used to house the stationary contact, and in order to achieve heat dissipation, a heat dissipation channel is provided on the side wall of the contact box near the top.

[0003] Therefore, since the heat dissipation channel and the stationary contact are located on different walls of the contact box, the distance between them is relatively large, which can easily lead to problems such as untimely heat dissipation of the heat dissipation channel and unsatisfactory heat dissipation effect. Utility Model Content

[0004] In order to overcome at least one of the defects described in the prior art, the present invention provides a contact box to solve the problem of unsatisfactory heat dissipation.

[0005] The technical solution adopted by this utility model to solve its problem is:

[0006] A contact box, comprising:

[0007] The box body has a cavity in the middle, the bottom of the cavity is open, and at least one heat dissipation hole is provided on the top of the box body;

[0008] A stationary contact, the stationary contact including a fixing part and an extension part connected to the fixing part, and a mounting seat embedded in the fixing part, the extension part passing through the top of the housing and extending into the cavity;

[0009] The heat dissipation holes are located on the periphery of the stationary contact.

[0010] Furthermore, the heat dissipation hole includes a first right-angled side, a second right-angled side, and an arc-shaped side;

[0011] One end of the first right-angled side and one end of the second right-angled side are perpendicularly connected. The two ends of the arc-shaped side are connected to the other ends of the first right-angled side and the second right-angled side to form an enclosed area. The concave side of the arc-shaped side is away from the enclosed area.

[0012] The concave side of the arc-shaped edge extends along the periphery of the fixing part.

[0013] Furthermore, the heat dissipation hole also includes a first extending edge and a second extending edge;

[0014] One end of the first extended side is perpendicularly connected to the end of the first right-angled side away from the second right-angled side, and the other end is connected to one end of the arc-shaped side. One end of the second extended side is perpendicularly connected to the end of the second right-angled side away from the first right-angled side, and the other end is connected to the end of the arc-shaped side away from the first extended side.

[0015] Furthermore, the number of heat dissipation holes is four, and the four heat dissipation holes are distributed on both sides of the fixing part.

[0016] Furthermore, it also includes a pressure equalization assembly, which includes a pressure equalization ring and a connector connected to the pressure equalization ring;

[0017] The equalizing ring and the connector are embedded in the top of the box body, and the mounting base is mounted on the connector. Both the connector and the mounting base are located in the middle of the equalizing ring.

[0018] Furthermore, the outer wall of the equalizing ring is provided with a rolled edge.

[0019] Furthermore, it also includes fasteners;

[0020] The fixing part is provided with a plurality of fixing holes, and the mounting base is provided with threaded holes of the same number as the fixing holes;

[0021] The mounting base and the fixing part are positioned and cast onto the upper end of the box body through the fixing hole.

[0022] Furthermore, the outer wall of the mounting base is provided with several recesses or protrusions.

[0023] Furthermore, it also includes an umbrella skirt, which includes multiple protruding ribs;

[0024] Multiple protruding ridges are disposed on the outer side wall of the box or the inner side wall of the cavity, and are arranged from the top to the bottom of the box.

[0025] Furthermore, the bottom of the box body is provided with an outwardly extending flange, and the flange is provided with a plurality of mounting holes for mounting the box body;

[0026] Alternatively, it may include two positioning strips, which are positioned opposite each other on two opposite sides of the top of the box body for installation positioning when an external exhaust duct is connected.

[0027] Furthermore, the bottom of the box body is provided with an outwardly extending flange, and the flange is provided with a plurality of mounting holes for mounting the box body;

[0028] Furthermore, it also includes two positioning strips, which are arranged opposite each other on two opposite sides of the top of the box body for installation positioning when the external exhaust duct is connected.

[0029] In summary, the contact box provided by this utility model has the following technical effects:

[0030] The heat dissipation holes are located on the top of the box and around the fixing part of the stationary contact. The heat dissipation holes and the stationary contact are both located on the top of the box, and the two are closer together. The fixing part is used to connect to the external power. When the fixing part is connected to the power (especially high voltage), the heat generated in the contact box can be directly and quickly dissipated from the surrounding heat dissipation holes, which improves the heat dissipation efficiency. Attached Figure Description

[0031] Figure 1 This is a perspective view of the contact box according to an embodiment of the present utility model;

[0032] Figure 2 This is a cross-sectional view of the contact box according to an embodiment of the present utility model;

[0033] Figure 3 This is a top view of the contact box according to an embodiment of the present utility model;

[0034] Figure 4 This is an assembly diagram of the equalizing ring and stationary contact of the contact box according to an embodiment of the present utility model;

[0035] Figure 5 This is an assembly diagram of the equalizing ring and mounting base of the contact box according to an embodiment of the present utility model.

[0036] The meanings of the reference numerals in the attached figures are as follows:

[0037] 10. Box body; 30. Stationary contact; 31. Fixing part; 311. Fixing hole; 32. Extension part; 33. Mounting base; 301. Threaded hole; 3011. Concave ring; 40. Heat dissipation hole; 41. First right-angled side; 42. Second right-angled side; 43. Arc-shaped side; 44. First extension side; 45. Second extension side; 50. Pressure equalization assembly; 51. Pressure equalization ring; 511. Rolled edge; 52. Connector; 60. Flange; 601. Mounting hole; 70. Umbrella skirt; 80. Positioning strip. Detailed Implementation

[0038] To better understand and implement this invention, the technical solutions in the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings.

[0039] In the description of this utility model, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0040] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0041] Contact boxes are essential key electrical components in complete switchgear systems. They are used in various switch cabinets and mainly serve to provide insulation, isolation, and connection transition.

[0042] See Figure 1 , Figure 2 and Figure 3 This utility model discloses a contact box, including a box body 10 and a stationary contact 30. The box body 10 has a cavity in the middle and the bottom of the cavity is open. The top of the box body 10 is provided with at least one heat dissipation hole 40. The stationary contact 30 includes a fixing part 31 and an extension part 32 connected to the fixing part 31, as well as a mounting seat 33 embedded in the fixing part 31. The extension part 32 passes through the top of the box body 10 and extends into the cavity. The heat dissipation hole 40 is located on the periphery of the stationary contact 30.

[0043] The overall outer contour of the box is usually a cuboid; the middle of the box 10 is hollow, and the bottom of the box 10 is open so that the cavity can communicate with the outside.

[0044] The mounting base 33 is typically made of metal. Preferably, in this embodiment, the mounting base can be cylindrical, but other shapes include polygonal prisms, etc., which are not limited here. In this embodiment, the mounting base 33 is embedded in the fixing part 31. Preferably, in this embodiment, the housing 10 is formed by epoxy casting, thereby embedding the stationary contact 30 and the mounting base 33 in the top of the housing 10. Importantly, in this embodiment, at least the top of the stationary contact 30 is exposed on the top of the housing 10.

[0045] Combination Figure 4The stationary contact 30 includes a horizontal plate and a vertical plate, which are vertically connected to form an L-shaped structure. The top of the horizontal plate of the stationary contact 30 protrudes 2mm from the top of the housing 10, thus ensuring that the external copper busbar does not collide with the top surface of the housing when it overlaps with the horizontal plate. The horizontal plate can be connected to the mounting base 33, and the connection method includes, but is not limited to, bonding or welding. In addition, the vertical plate extends directly into the cavity of the housing 10. In this embodiment, the horizontal plate of the stationary contact 30 provides a connection position for the external busbar, facilitating the connection of the busbar.

[0046] The heat dissipation hole 40 can be a round hole or a regular or irregular polygonal hole; the heat dissipation hole 40 penetrates through the top of the box body 10, thereby connecting the cavity and the outer top of the box body 10. As mentioned above, the horizontal plate serves as the connection point with the busbar, and the temperature rises relatively quickly at this location. As a result, the temperature at the top of the cavity is relatively high, and the heat at this location can be quickly dissipated to the outside through the heat dissipation hole 40, which is closer to the top, thus improving the heat dissipation effect.

[0047] See Figure 3 Optionally, the heat dissipation hole 40 includes a first right-angled side 41, a second right-angled side 42, and an arc-shaped side 43.

[0048] One end of the first right-angled side 41 is perpendicularly connected to one end of the second right-angled side 42. The two ends of the arc-shaped side 43 are connected to the other ends of the first right-angled side 41 and the second right-angled side 42 respectively to form an enclosed area. The concave side of the arc-shaped side 43 is away from the enclosed area.

[0049] The concave side of the arc-shaped edge 43 extends around the fixing part 31.

[0050] In this embodiment, one end of the curved edge 43 connects to the end of the first right-angled edge 41 that is away from the second right-angled edge 42, and the other end of the curved edge 43 connects to the end of the second right-angled edge 42 that is away from the first right-angled edge 41 to form an enclosed area. The first right-angled edge 41 is parallel to the inner side of one side of the top surface of the box body 10, and similarly, the second right-angled edge 42 is parallel to the inner side of one side of the top surface of the box body 10. The curved edge 43 is located within the right-angled area enclosed by the first right-angled edge 41 and the second right-angled edge 42. Therefore, it can be understood that the curved edge 43 encloses the horizontal plate inwards from its periphery. In this embodiment, the curved edge 43 can be adjusted to fit the horizontal plate as closely as possible by changing its curvature, thereby maximizing the enclosed area. It is known that a larger enclosed area corresponds to a larger area of ​​the heat dissipation holes 40, resulting in better heat dissipation.

[0051] Optionally, the heat dissipation hole 40 may also include a first extension edge 44 and a second extension edge 45.

[0052] One end of the first extended side 44 is perpendicularly connected to the end of the first right-angled side 41 that is away from the second right-angled side 42, and the other end is connected to one end of the arc side 43. One end of the second extended side 45 is perpendicularly connected to the end of the second right-angled side 42 that is away from the first right-angled side 41, and the other end is connected to the end of the arc side 43 that is away from the first extended side 44.

[0053] In this embodiment, the arc-shaped edge 43 can approach the horizontal plate by changing its curvature. In order to further increase the enclosure area, the first extension edge 44 and the second extension edge 45 can extend towards the horizontal plate to push the arc-shaped edge 43 closer to the horizontal plate. In addition, by changing the curvature of the arc-shaped edge 43, the arc-shaped edge 43 can approach the horizontal plate even closer, thus increasing the heat dissipation hole 40.

[0054] Optionally, there are four heat dissipation holes 40, which are distributed on both sides of the fixing part 31.

[0055] The four heat dissipation holes 40 can be respectively set at the four corners of the top surface of the box 10. The four heat dissipation holes 40 surround the horizontal plate in the middle, so that the multiple heat dissipation holes 40 can form multi-point heat dissipation, which is conducive to ensuring the temperature balance of each position in the cavity.

[0056] Optionally, it also includes a pressure equalization assembly 50, which includes a pressure equalization ring 51 and a connector 52 connected to the pressure equalization ring 51.

[0057] The equalizing ring 51 and the connector 52 are embedded in the top of the box 10, and the mounting base 33 is mounted on the connector 52. Both the connector 52 and the mounting base 33 are located in the middle of the equalizing ring 51.

[0058] The equalizing ring 51 is a metal ring with a certain height, which is greater than or equal to the height of the mounting base 33. The connector 52 is a metal rod, with both ends connected to the inner wall of the equalizing ring 51. In this embodiment, the equalizing ring 51 and the connector 52 are also embedded in the top of the sub-box 10 by epoxy casting. Heat dissipation holes 40 are distributed around the periphery of the equalizing ring 51.

[0059] As mentioned above, the horizontal plate is used to connect to the busbar. Generally, the connection points are multi-point, and each point generates an electric field. However, the electric field at each point is uneven, affecting the electric field distribution in the contact box. Uneven electric field distribution is detrimental to the stable operation of related components. In this embodiment, the mounting base 33 is connected to the top of the connector 52, and the equalizing ring 51 and the mounting base 33 are at the same potential. The outer equalizing ring 51 shields the electric field in the middle, so the electric field is ultimately formed by the equalizing ring 51. It can be seen that the cylindrical electric field generated by the annular equalizing ring 51 is more uniform, solving the aforementioned problem of uneven electric field distribution.

[0060] Optionally, at least one rolled edge 511 is provided on the outer wall of the equalizing ring 51, and the rolled edge 511 includes a complete closed loop.

[0061] The rolled edge 511 comprises a complete closed loop, thereby concealing its outer edge. Rolled edges are provided at the top and / or bottom of the outer wall of the equalizing ring 51, specifically, the rolled edges are all rolled towards the center of the equalizing ring 51. The function of the rolled edge 511 is to increase the gripping points of the equalizing ring 51 within the housing 10, improving the stability of the equalizing ring 51's placement; furthermore, the rolled edge 511 forms a complete closed loop, which also forms a cylindrical annular structure. Referring to the foregoing, the cylindrical electric field of the rolled edge 511 is more uniform.

[0062] Optional, combined Figure 5 It also includes fasteners. The fixing part 31 is provided with a plurality of fixing holes 311, and the mounting base 33 is provided with threaded holes 301, the number of threaded holes 301 being the same as the number of fixing holes 311.

[0063] The threaded hole 301 on the mounting base 33 and the fixing part 31 are positioned and cast onto the upper end of the box body 10 through the fixing hole 311.

[0064] The system comprises four fixing holes 311 and four threaded holes 301. The four fixing holes 311 are arranged along the length of the horizontal plate and penetrate it. The four mounting bases 33 are cylindrical structures, each with a threaded hole 301 at its top. These four threaded holes 301 are arranged along the length of the connector 52. In this embodiment, the mounting bases 33 are riveted to the connector 52. After the horizontal plate is installed on the mounting bases 33, the four fixing holes 311 and the four threaded holes 301 are aligned one by one. The fasteners (preferably bolts or screws) pass through the fixing holes 311 from top to bottom and are finally screwed into the threaded holes 301.

[0065] In another implementation, in order to increase the contact area between the mounting base 33 and the casting material during casting, the mounting base 33 is divided into multiple individual units, the number of which is the same as the number of fixing holes, and each mounting base 33 is provided with a threaded hole 301.

[0066] Optionally, the outer wall of the mounting base 33 is provided with several recesses or protrusions.

[0067] The recess is a ring-shaped concave ring 3011, and there can be multiple concave rings 3011 arranged along the height direction of the mounting base 33. Conversely, the convex part is a ring-shaped convex ring. Other recesses can be pits, and convex parts can be protrusions. In this embodiment, the function of the recesses or convex parts is to increase the gripping points of the mounting base 33 in the housing 10 and improve the stability of the mounting base 33 in the installation.

[0068] Optionally, it also includes a skirt 70, which includes multiple ridges.

[0069] Multiple protruding ridges are provided on the outer side wall of the box body 10 or the inner side wall of the cavity, and are arranged from the top to the bottom of the box body 10.

[0070] The multiple protruding ridges increase the heat dissipation area of ​​the outer wall of the housing 10 and the inner wall of the cavity, thus enhancing the heat dissipation function. In addition, the undulating structure formed by the multiple protruding ridges on the outer wall of the housing 10 increases the creepage distance from the top to the bottom of the housing 10, preventing breakdown and thus protecting the safety of equipment and personnel.

[0071] Optionally, the bottom of the housing 10 is provided with an outwardly extending flange 60, and the flange 60 is provided with a plurality of mounting holes 601 for mounting the housing 10.

[0072] The bottom edge of the box 10 is provided with a continuous flange 60, and multiple mounting holes 601 are provided on the flange 60. Fasteners can pass through the mounting holes 601 to fix the box 10.

[0073] Optionally, it also includes two positioning strips 80, which are arranged opposite each other on two opposite sides of the top of the box 10 for installation positioning when the external exhaust duct is connected.

[0074] The box body 10 has two positioning strips 80 on its two opposite sides at the top, and these two positioning strips 80 are arranged in parallel. The aforementioned heat dissipation holes 40 are located between the two positioning strips 80. The purpose of this arrangement is that a heat dissipation channel is usually connected to the top of the box body 10, and two parallel positioning plates are provided at one end of the heat dissipation channel. Positioning blocks are provided at both ends of the positioning plates, thereby forming a U-shaped positioning latch on the outer side of the positioning plates. From top to bottom, one positioning latch engages with the inner side of a positioning strip 80, completing the quick positioning of the end of the heat dissipation channel.

[0075] The technical means disclosed in this utility model are not limited to those disclosed in the above embodiments, but also include technical solutions composed of any combination of the above technical features. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications are also considered within the scope of protection of this utility model.

Claims

1. A contact box, characterized in that, include: Box body (10) and stationary contact (30); The box body (10) has a cavity in the middle, the bottom of the cavity is open, and the top of the box body (10) is provided with at least one heat dissipation hole (40); The stationary contact (30) includes a fixing part (31), an extension part (32) connected to the fixing part (31), and a mounting base (33) embedded in the fixing part (31). The extension part (32) passes through the top of the housing (10) and extends into the cavity. The heat dissipation hole (40) is located on the periphery of the stationary contact (30).

2. The contact box according to claim 1, characterized in that, The heat dissipation hole (40) includes a first right-angled side (41), a second right-angled side (42), and an arc-shaped side (43); One end of the first right-angled side (41) and one end of the second right-angled side (42) are perpendicularly connected. The two ends of the arc-shaped side (43) are connected to the other ends of the first right-angled side and the second right-angled side to form an enclosed area. The concave side of the arc-shaped side (43) is away from the enclosed area. The concave side of the arc-shaped edge (43) extends along the periphery of the fixing part (31).

3. The contact box according to claim 2, characterized in that, The heat dissipation hole (40) further includes a first extension edge (44) and a second extension edge (45); One end of the first extended side (44) is perpendicularly connected to the end of the first right-angled side (41) away from the second right-angled side (42), and the other end is connected to one end of the arc-shaped side (43). One end of the second extended side (45) is perpendicularly connected to the end of the second right-angled side (42) away from the first right-angled side (41), and the other end is connected to the end of the arc-shaped side (43) away from the first extended side (44).

4. The contact box according to claim 1, characterized in that, It also includes a pressure equalization assembly (50), which includes a pressure equalization ring (51) and a connector (52) connected to the pressure equalization ring (51); The equalizing ring (51) and the connector (52) are embedded in the top of the box (10), and the mounting base (33) is mounted on the connector (52). The connector (52) and the mounting base (33) are both located in the middle of the equalizing ring (51).

5. The contact box according to claim 4, characterized in that, The outer wall of the equalizing ring (51) is provided with a rolled edge (511), and the rolled edge (511) includes a complete closed loop.

6. The contact box according to any one of claims 1-5, characterized in that, It also includes fasteners; The fixing part (31) is provided with a plurality of fixing holes (311), and the mounting base (33) is provided with threaded holes (301) in the same number as the fixing holes (311); The mounting base (33) and the fixing part (31) are positioned and cast on the upper end of the box body (10) through the fixing hole (311).

7. The contact box according to claim 6, characterized in that, The outer wall of the mounting base (33) is provided with several recesses or protrusions.

8. The contact box according to claim 1, characterized in that, It also includes a skirt (70), which includes a plurality of ridges; Multiple protruding ridges are disposed on the outer side wall of the box body (10) or the inner side wall of the cavity, and are arranged from the top to the bottom of the box body (10).

9. The contact box according to claim 1, characterized in that, The bottom of the box (10) is provided with an outwardly extending flange (60), and the flange (60) is provided with a plurality of mounting holes (601) for mounting the box (10).

10. The contact box according to claim 1, characterized in that, It also includes two positioning strips (80), which are arranged opposite each other on the two opposite sides of the top of the box body (10) for installation positioning when the external exhaust pipe is connected.

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