Contact box for switch cabinet

Abstract

The utility model discloses a contact box for a switch cabinet, which relates to the technical field of electrical equipment, comprises a contact box body and a busbar, and is characterized in that a capacitor core rod is embedded in the inner wall of the contact box body, the input end of the capacitor core rod is fixedly connected with the busbar through a high-voltage lead, and the output end of the capacitor core rod is led out through a lead to form a low-voltage output terminal. A dehumidification assembly is detachably installed in the contact box body and located on the outer side of the static contact. According to the utility model, air in the contact box body is dried through the annular drying box, so that the condensation phenomenon in the contact box body is prevented, and the safety performance and the service life of the contact box body are effectively improved and prolonged when the contact box body is used in the switch cabinet; the detachable annular drying box can be replaced in time, the operation is simple and convenient, the drying effect of the drying agent is ensured, the safe operation of the switch cabinet is ensured, and the potential safety hazard is reduced.

Description

Technical Field

[0001] This utility model relates to the field of electrical equipment technology, specifically to a contact box for switch cabinets. Background Technology

[0002] The contact box is an important component of the switchgear, used to install stationary contacts. It generally includes a box body, which is usually located in the busbar compartment on one side of the partition and installed on the partition inside the switchgear cabinet. The box body is connected to the truck compartment. The stationary contacts are fixed in the box body so as to connect or disconnect with the Phillips head contacts of the circuit breaker in the truck compartment.

[0003] Currently, most existing switchgear contact boxes are cylindrical structures. During prolonged use, when the stationary contact and the Phillips head contact are in contact, a significant amount of heat generated inside the contact box cannot be dissipated in time, resulting in poor heat dissipation. If there is a large temperature difference between the inner and outer surfaces of the contact box, and the switchgear is used in a humid environment, condensation can form inside the contact box. This can easily lead to corona discharge and severe partial discharge. If the partial discharge is severe, it can eventually break down the contact box, causing damage or even power outages and fires in the switchgear, posing safety hazards. Utility Model Content

[0004] The purpose of this utility model is to provide a contact box for switch cabinets, which aims to solve the safety hazard caused by condensation inside the contact box in the above-mentioned background art.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a contact box for a switch cabinet, comprising a contact box body and a busbar, wherein one end of the contact box body is open and the other end is closed, a stationary contact is fixedly installed on the inner wall of the closed end of the contact box body, and a busbar inlet and outlet are provided on the side wall of the closed end of the contact box body, the busbar inlet and outlet communicating with the inner cavity of the contact box body, the busbar passing through the busbar inlet and outlet and connecting to the bottom of the stationary contact, a capacitor core rod is embedded in the inner wall of the contact box body, the input end of the capacitor core rod is fixedly connected to the busbar through a high-voltage lead, and the output end is led out through a lead to form a low-voltage output terminal, and a dehumidification component is detachably installed inside the contact box body, the dehumidification component being located outside the stationary contact.

[0006] Furthermore, the dehumidification assembly includes an annular drying box. The inner sidewall of the contact box is provided with multiple snap-fit ​​blocks, and the outer sidewall of the annular drying box is provided with multiple locking grooves that lock and engage with the snap-fit ​​blocks. The locking grooves are L-shaped and include interconnected vertical and horizontal grooves. Protrusions are fixedly connected to the inner walls at the top and bottom of the horizontal grooves. The protrusions are made of rubber and are hemispherical.

[0007] Furthermore, the annular drying box is filled with desiccant particles, and the inner wall of the annular drying box is fitted with a perforated mesh and has several ventilation holes at both ends.

[0008] Furthermore, outer umbrella skirts are arranged at equal intervals on one side of the outer wall of the contact box, and inner umbrella skirts are fixedly connected to the inner wall of the contact box near the opening end.

[0009] This utility model has the following beneficial effects:

[0010] This utility model provides a contact box for switchgear. An annular drying box, located inside the contact box and acting on the outside of the moving and stationary contacts, dries the air inside the contact box, preventing condensation and effectively improving the safety performance and service life of the contact box during use inside the switchgear. The detachable annular drying box allows for timely replacement, is easy and convenient to operate, ensures the drying effect of the desiccant, guarantees the safe operation of the switchgear, and reduces safety hazards. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the overall structure of the contact box in this utility model;

[0012] Figure 2 This is a schematic diagram of the structure of the annular drying box in this utility model;

[0013] In the diagram: 1. Contact box; 2. Busbar; 3. Stationary contact; 4. Capacitor core; 5. Low voltage output terminal; 6. Annular drying box; 7. Snap-fit ​​block; 8. Locking groove; 9. Protrusion; 10. Hollowed-out mesh; 11. Vent hole; 12. Outer umbrella skirt; 13. Inner umbrella skirt. Detailed Implementation

[0014] like Figures 1 to 2 As shown, a contact box for a switchgear includes a contact box body 1 and a busbar 2. One end of the contact box body 1 is open and the other end is closed. A stationary contact 3 is fixedly installed on the inner wall of the closed end of the contact box body 1. A busbar inlet and outlet are opened on the side wall of the closed end of the contact box body 1. The busbar inlet and outlet communicate with the inner cavity of the contact box body 1. The busbar 2 passes through the busbar inlet and outlet and is connected to the bottom of the stationary contact 3. A capacitor core 4 is embedded in the inner wall of the contact box body 1. The input end of the capacitor core 4 is fixedly connected to the busbar 2 through a high-voltage lead, and the output end is led out through a lead to form a low-voltage output terminal 5. A dehumidification component is detachably installed inside the contact box body 1 and is located outside the stationary contact 3. The setting of the capacitor core 4 can detect current changes in real time and output secondary signals, realize intelligent monitoring of the working status of the switchgear, improve the safety and reliability of the system, and is suitable for the intelligent needs of modern power grids.

[0015] The dehumidification assembly includes an annular drying box 6. Multiple locking blocks 7 are provided on the inner wall of the contact box body 1. Multiple locking grooves 8 are provided on the outer wall of the annular drying box 6 to engage with the locking blocks 7. The outer wall of the annular drying box 6 slides against the inner wall of the contact box body 1. The locking grooves 8 are L-shaped and include interconnected vertical and horizontal grooves. Protrusions 9 are fixedly connected to the inner walls of both the top and bottom of the horizontal groove. The protrusions 9 are made of rubber and are hemispherical. The annular drying box 6 is slowly fed into the contact box body 1. Inside the cavity, the snap-fit ​​block 7 enters the vertical groove of the locking groove 8. When the annular drying box 6 is rotated, the snap-fit ​​block 7 can enter the horizontal groove from the vertical groove. At this time, the snap-fit ​​block 7 can limit the annular drying box 6 through the locking groove 8, so that the annular drying box 6 is fixed. After the snap-fit ​​block 7 enters the horizontal groove, the protrusions 9 on the inner walls of the top and bottom of the horizontal groove can limit the snap-fit ​​block 7, so that it will generate a certain resistance when it leaves the horizontal groove, thereby further ensuring the fixing effect of the snap-fit ​​block 7 on the annular drying box 6.

[0016] The annular drying box 6 is filled with desiccant particles. The inner wall of the annular drying box 6 is equipped with a perforated mesh 10 and several ventilation holes 11 are opened at both ends. The desiccant in the annular drying box 6 can absorb moisture in the air by interacting with the air inside the box cavity through the perforated mesh 10 and the ventilation holes 11, thereby achieving the effect of drying and dehumidifying.

[0017] The outer wall of the contact box 1 is provided with outer skirts 12 arranged at equal intervals on one side, and an inner skirt 13 is fixedly connected to the inner wall of the contact box 1 near the opening end. The contact box 1 is made of epoxy resin casting. The umbrella rings provided on the inner and outer walls can effectively increase the creepage distance and meet the insulation requirements.

[0018] The specific operation process of this utility model is as follows:

[0019] The contact box 1 is installed inside the busbar room of the switch cabinet. The vertical groove of the annular drying box 6 is oriented towards the opening end of the contact box 1, and it is slowly slid into the box. The annular drying box 6 is rotated so that the locking block 7 on the inner wall of the contact box 1 can enter the horizontal groove from the vertical groove. At this time, the locking block 7 can limit the annular drying box 6 through the locking groove 8, so that the annular drying box 6 is fixed. When the locking block 7 is fully inserted into the horizontal groove, the protrusions 9 on the inner walls of the top and bottom of the horizontal groove can limit the locking block 7, so that it will generate a certain resistance when it is disengaged from the horizontal groove, thereby further ensuring the fixing effect of the locking block 7 on the annular drying box 6. The annular drying box 6 can keep the air in the cavity of the contact box 1 in a relatively dry state. The stationary contact 3 cooperates with the moving contact provided at the end of the switch. That is, when the switch is pushed to the working position by the trolley, the stationary contact 3 is inserted into the moving contact, and the moving contact is connected to the stationary contact 3.

Claims

1. A contact box for a switch cabinet, comprising a contact box body (1) and a busbar (2), wherein one end of the contact box body (1) is open and the other end is closed, a stationary contact (3) is fixedly installed on the inner wall of the closed end of the contact box body (1), a busbar inlet and outlet are provided on the side wall of the closed end of the contact box body (1), the busbar inlet and outlet communicate with the inner cavity of the contact box body (1), and the busbar (2) passes through the busbar inlet and outlet and connects to the bottom of the stationary contact (3), characterized in that, A capacitor core rod (4) is embedded in the inner wall of the contact box (1). The input end of the capacitor core rod (4) is fixedly connected to the busbar (2) through a high voltage lead wire, and the output end is led out through a lead wire to form a low voltage output terminal (5). A dehumidification component is detachably installed inside the contact box (1). The dehumidification component is located outside the stationary contact (3).

2. A contact box for a switchgear according to claim 1, characterized in that, The dehumidification assembly includes an annular drying box (6), and multiple snap-fit ​​blocks (7) are provided on the inner side wall of the contact box body (1). Multiple locking grooves (8) that lock and engage with the snap-fit ​​blocks (7) are provided on the outer side wall of the annular drying box (6). The locking grooves (8) are L-shaped structures. The locking grooves (8) include vertical grooves and horizontal grooves that are connected to each other. Protrusions (9) are fixedly connected to the inner walls at the top and bottom of the horizontal grooves. The protrusions (9) are made of rubber and are hemispherical.

3. A contact box for a switchgear according to claim 2, characterized in that, The annular drying box (6) is filled with desiccant particles. The inner wall of the annular drying box (6) is fitted with a perforated mesh (10) and several ventilation holes (11) are opened at both ends.

4. A contact box for a switchgear according to claim 1, characterized in that, The outer wall of the contact box (1) is provided with an outer umbrella skirt (12) arranged at equal intervals on one side, and an inner umbrella skirt (13) is fixedly connected to the inner wall of the contact box (1) near the opening end.

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