Lower grounding device of environment-friendly cabinet

Abstract

The utility model relates to a lower grounding device of an environment-friendly cabinet, which comprises a transmission mechanism, three lower grounding moving contacts, three outlet bushings and three lower grounding static contacts, and is characterized in that the transmission mechanism comprises a mechanism frame, a lower grounding rotating shaft, a transmission crank arm, a transmission plate, a connecting rod and a driving crank arm which is in linkage fit with an isolation operation shaft of an isolation switch; the transmission rod is arranged between the driving crank arm and the transmission plate which are connected, two positioning bolts connected with the transmission rod and the connecting rod are respectively arranged at two ends of the transmission plate, two guide holes matched with the two positioning bolts are formed in the mechanism frame, the two positioning bolts are respectively inserted into the two guide holes, and the two positioning bolts are connected with the transmission plate. The two positioning bolts act along with the transmission plate and slide in the two guide holes in a reciprocating mode. The utility model has the advantages of simple structure, stable and reliable performance, and convenient assembly.

Description

Technical Field

[0001] The utility model relates to the technical field of switch cabinets, in particular to a lower grounding device of an environmental protection cabinet. Background Art

[0002] At present, in view of the rapidly developing power industry, the development of environmentally friendly gas-insulated ring main unit is a general trend. The future power transmission and distribution equipment will inevitably continue to develop around the needs of safety, reliability, miniaturization, and environmental protection. The environmental protection gas cabinet is an electrical equipment with a composite insulation structure that uses dry air insulation or nitrogen as the main insulating medium and solid insulation for internal vacuum arc extinguishing. When repairing the environmental protection cabinet, in order to prevent residual pressure in the line, it is usually necessary to install a grounding switch to release the residual pressure, thereby ensuring personal safety during maintenance. Therefore, a lower grounding device is provided on the environmental protection cabinet. The structural design of the lower grounding device of the existing environmental protection gas cabinet is relatively complicated, and the transmission between the isolating switch and the lower grounding moving contact is unreliable, resulting in unreliable contact between the lower grounding moving contact and the lower grounding static contact. Summary of the invention

[0003] The purpose of the utility model is to overcome the defects of the prior art and provide a lower grounding device for an environmental protection cabinet which has a simple structure, stable and reliable performance and convenient assembly.

[0004] To achieve the above-mentioned purpose, the utility model adopts a lower grounding device of an environmental protection cabinet, comprising a transmission mechanism arranged in the cabinet, three lower grounding moving contacts linked with the transmission mechanism, three outlet bushings arranged in the cabinet, and three lower grounding static contacts respectively arranged on the three outlet bushings and connected to three fuses. The transmission mechanism comprises a mechanism frame arranged in the cabinet, a lower grounding rotating shaft rotatably arranged on the mechanism frame and used to drive the three lower grounding moving contacts to perform opening and closing actions, a transmission crank arm arranged on the lower grounding rotating shaft, a transmission plate slidably arranged on the mechanism frame, a connecting rod connected between the transmission crank arm and the transmission plate, and an isolating switch connected to the isolating switch. A driving crank arm that cooperates with the operating shaft in linkage, a transmission rod between the connected driving crank arm and the transmission plate, two positioning bolts connected to the transmission rod and the connecting rod are respectively provided at both ends of the transmission plate, two guide holes that cooperate with the two positioning bolts are provided on the mechanism frame, the two positioning bolts are respectively inserted into the two guide holes, the two positioning bolts move with the transmission plate and slide back and forth in the two guide holes, a crank arm shaft is provided on the isolation operating shaft, one end of the crank arm shaft has a clamping part that cooperates with the driving crank arm, the clamping part is clamped in the clamping hole of the driving crank arm, and constitutes a clamping fit between the crank arm shaft and the driving crank arm.

[0005] The beneficial effects of the above structure are as follows: The transmission mechanism of the lower grounding device adopts a link-type transmission structure design. This structure design is simpler, the assembly is more convenient, and the transmission plate is slidably arranged on the mechanism frame, thus ensuring that the transmission plate can slide reliably on the mechanism frame and the transmission is more reliable. During maintenance, the isolation operating shaft of the disconnector drives the transmission rod to act through the driving crank arm. The transmission rod drives the transmission plate to slide on the mechanism frame. The transmission plate drives the transmission crank arm to act through the connecting rod. The transmission crank arm drives the lower grounding rotating shaft to rotate. The lower grounding rotating shaft drives the three lower grounding moving contacts to contact the three lower grounding static contacts, thereby realizing the closing of the lower grounding of the lower grounding device. The isolation operating shaft is clamped on the driving crank arm through the crank arm shaft, which is convenient for the assembly of the isolation operating shaft and the driving crank arm and can ensure more reliable transmission between the isolation operating shaft and the driving crank arm. Therefore, the lower grounding device of the environmental protection cabinet has the advantages of simple structure, stable and reliable performance, and convenient assembly.

[0006] Particularly, positioning grooves for cooperating with the two positioning bolts are respectively arranged at one ends of the two guiding holes. When the transmission plate slides to the closing position, the two positioning bolts at both ends of the transmission plate respectively slide into the two positioning grooves. The positioning grooves play a positioning role for the positioning bolts, can position the transmission plate at the closing position, and can ensure more reliable closing of the lower grounding device.

[0007] Particularly, a square clamping portion for cooperating with the three lower grounding moving contacts is arranged on the lower grounding rotating shaft. Square clamping holes for cooperating with the square clamping portion are respectively arranged on the three lower grounding moving contacts. The square clamping portion is inserted into the square clamping holes, and screws connecting the three lower grounding moving contacts are arranged on the square clamping portion. The three lower grounding moving contacts and the lower grounding rotating shaft are assembled by a clamping cooperation method, and the assembly is more convenient.

[0008] Particularly, insulating cover bodies for accommodating the three lower grounding static contacts are respectively arranged on the three outgoing line bushings. The three lower grounding static contacts are respectively arranged in the insulating cover bodies of the three outgoing line bushings, which can increase the phase insulation distance between the three lower grounding static contacts and is beneficial to improving the working reliability of the lower grounding device.

[0009] Particularly, guiding inclined surfaces for cooperating with the three lower grounding moving contacts are respectively arranged on one sides of the three lower grounding static contacts. The guiding inclined surfaces play a guiding role for the lower grounding moving contacts and can ensure reliable contact between the lower grounding moving contacts and the lower grounding static contacts.

[0010] Specifically, the isolation operation shaft is provided with a slot that cooperates with the crank arm shaft. The other end of the crank arm shaft is inserted into the slot. A jack is provided at the other end of the crank arm shaft, and a pin is provided on the isolation operation shaft and inserted into the jack, forming a clamping fit between the crank arm shaft and the pin. The isolation operation shaft is connected to the crank arm shaft through the pin, facilitating the assembly of the isolation operation shaft and the crank arm shaft and ensuring more reliable transmission between the isolation operation shaft and the crank arm shaft. Brief Description of the Drawings

[0011] Figure 1 It is a perspective view of an embodiment of the present invention.

[0012] Figure 2 It is a right view of an embodiment of the present invention.

[0013] Figure 3 It is a front view of an embodiment of the present invention.

[0014] Figure 4 It is an assembly drawing of the isolation operation shaft and the driving crank arm of an embodiment of the present invention. Detailed Description of the Embodiment

[0015] As Figures 1 to 4 shown, an embodiment of the present invention is a lower grounding device of an environmental protection cabinet, including a transmission mechanism 20 arranged in the cabinet body 10, three lower grounding moving contacts 11 linked and cooperated with the transmission mechanism 20, three outgoing line sleeves 12 arranged in the cabinet body 10, and three lower grounding static contacts 14 respectively arranged on the three outgoing line sleeves 12 and connected to three fuses 13. The transmission mechanism 20 includes a mechanism frame 21 arranged in the cabinet body 10, a lower grounding rotating shaft 22 rotatably arranged on the mechanism frame 21 and used to drive the three lower grounding moving contacts 11 to perform opening and closing actions, a transmission crank arm 23 arranged on the lower grounding rotating shaft 22, a transmission plate 24 slidably arranged on the mechanism frame 21, a connecting rod 25 connected between the transmission crank arm 23 and the transmission plate 24, a driving crank arm 26 linked and cooperated with the isolation operation shaft 151 of the disconnector 15, and a transmission rod 27 connected between the driving crank arm 26 and the transmission plate 24. Two positioning bolts 28 respectively connected to the transmission rod 27 and the connecting rod 25 are arranged at both ends of the transmission plate 24. Two guiding holes 211 cooperating with the two positioning bolts 28 are arranged on the mechanism frame 21. The two positioning bolts 28 are respectively inserted into the two guiding holes 211. The two positioning bolts 28 move with the transmission plate 24 and slide reciprocally in the two guiding holes 211. A crank arm shaft 16 is arranged on the isolation operation shaft 151. One end of the crank arm shaft 16 has a clamping portion 161 cooperating with the driving crank arm 26. The clamping portion 161 is clamped in the clamping hole 261 of the driving crank arm 26, forming a clamping fit between the crank arm shaft 16 and the driving crank arm 26.

[0016] As Figure 1 and 3 shown, positioning grooves 212 cooperating with two positioning bolts 28 are respectively arranged at one ends of the two guiding holes 211. When the transmission plate 24 slides to the closing position, the two positioning bolts 28 at both ends of the transmission plate 24 respectively slide into the two positioning grooves 212. The positioning grooves play a role in positioning the positioning bolts, and the transmission plate can be positioned at the closing position, which can ensure more reliable closing of the lower earthing device. A square clamping portion 221 cooperating with three lower earthing moving contacts 11 is arranged on the lower earthing rotating shaft 22. Square clamping holes 111 cooperating with the square clamping portion 221 are respectively arranged on the three lower earthing moving contacts 11. The square clamping portion 221 is inserted into the square clamping holes 111, and screws 29 connecting the three lower earthing moving contacts 11 are arranged on the square clamping portion 221. The three lower earthing moving contacts and the lower earthing rotating shaft are assembled in a clamping and cooperating manner, and the assembly is more convenient. Insulating cover bodies 121 for accommodating three lower earthing static contacts 14 are respectively arranged on the three outgoing line bushings 12. The three lower earthing static contacts are respectively arranged in the insulating cover bodies of the three outgoing line bushings, so that the phase insulation distance between the three lower earthing static contacts can be increased, and the working reliability of the lower earthing device can be improved. Guiding inclined surfaces 141 cooperating with the three lower earthing moving contacts 11 are respectively arranged on one sides of the three lower earthing static contacts 14. The guiding inclined surfaces play a guiding role for the lower earthing moving contacts, and can ensure reliable contact between the lower earthing moving contacts and the lower earthing static contacts. A slot cooperating with the toggle arm shaft 16 is arranged on the isolating operating shaft 151. The other end of the toggle arm shaft 16 is inserted into the slot. A jack is arranged at the other end of the toggle arm shaft 16. A pin 17 inserted into the jack is arranged on the isolating operating shaft 151, and a clamping and cooperating relationship between the toggle arm shaft 16 and the pin 17 is formed. The isolating operating shaft is connected to the toggle arm shaft through the pin, which is convenient for the assembly of the isolating operating shaft and the toggle arm shaft, and can ensure more reliable transmission between the isolating operating shaft and the toggle arm shaft.

[0017] The transmission mechanism of the lower earthing device adopts a connecting rod type transmission structure design. This structure design is simpler, the assembly is more convenient, and the transmission plate is slidably arranged on the mechanism frame, so as to ensure that the transmission plate can slide reliably on the mechanism frame and the transmission is more reliable. During maintenance, the isolation operation shaft of the disconnector drives the transmission rod to act through the driving crank arm. The transmission rod drives the transmission plate to slide on the mechanism frame. The transmission plate drives the transmission crank arm to act through the connecting rod. The transmission crank arm drives the lower earthing rotating shaft to rotate. The lower earthing rotating shaft drives the three lower earthing moving contacts to contact the three lower earthing static contacts, so as to realize the lower earthing closing of the lower earthing device. The isolation operation shaft is clamped on the driving crank arm through the crank arm shaft, which is convenient for the assembly of the isolation operation shaft and the driving crank arm and can ensure more reliable transmission between the isolation operation shaft and the driving crank arm. Therefore, the lower earthing device of this environmental protection cabinet has the advantages of simple structure, stable and reliable performance, and convenient assembly.

Claims

1. An under-grounding device for an environmental protection cabinet, characterized in that: The invention comprises a transmission mechanism arranged in the cabinet, three lower grounding moving contacts which are linked with the transmission mechanism, three outlet bushings arranged in the cabinet, and three lower grounding static contacts which are respectively arranged on the three outlet bushings and connected with three fuses. The transmission mechanism comprises a mechanism frame arranged in the cabinet, a lower grounding rotating shaft which is rotatably arranged on the mechanism frame and used to drive the three lower grounding moving contacts to perform opening and closing actions, a transmission crank arm arranged on the lower grounding rotating shaft, a transmission plate which is slidably arranged on the mechanism frame, a connecting rod connected between the transmission crank arm and the transmission plate, and a driving crank arm which is linked with the isolation operation shaft of the isolation switch. , a transmission rod between a driving crank arm connected to a transmission plate, two positioning bolts connected to the transmission rod and the connecting rod are respectively arranged at both ends of the transmission plate, two guide holes matched with the two positioning bolts are arranged on the mechanism frame, the two positioning bolts are respectively inserted into the two guide holes, the two positioning bolts move with the transmission plate and slide back and forth in the two guide holes, a crank arm shaft is arranged on the isolation operating shaft, one end of the crank arm shaft has a clamping part matched with the driving crank arm, the clamping part is clamped in the clamping hole of the driving crank arm, and constitutes a clamping fit between the crank arm shaft and the driving crank arm.

2. The lower grounding device of the environmental protection cabinet according to claim 1, characterized in that: One end of the two guide holes is respectively provided with a positioning groove matched with two positioning bolts. When the transmission plate slides to the closing position, the two positioning bolts at both ends of the transmission plate slide into the two positioning grooves respectively.

3. The lower grounding device of the environmental protection cabinet according to claim 1 or 2, characterized in that: The lower grounding rotating shaft is provided with a square clamping portion that matches with the three lower grounding moving contacts, and the three lower grounding moving contacts are respectively provided with square clamping holes that match with the square clamping portion. The square clamping portion is inserted into the square clamping hole, and the square clamping portion is provided with screws connected with the three lower grounding moving contacts.

4. The lower grounding device of the environmental protection cabinet according to claim 1 or 2, characterized in that: The three outlet bushings are respectively provided with insulating covers for accommodating three lower grounding static contacts.

5. The lower grounding device of the environmental protection cabinet according to claim 1 or 2, characterized in that: One side of the three lower grounding static contacts is respectively provided with a guiding inclined surface matched with the three lower grounding movable contacts.

6. The lower grounding device of the environmental protection cabinet according to claim 1 or 2, characterized in that: The isolation operation shaft is provided with a slot matching with the crank arm shaft, the other end of the crank arm shaft is inserted in the slot, the other end of the crank arm shaft is provided with a socket, the isolation operation shaft is provided with a pin inserted in the socket, and a snap fit between the crank arm shaft and the pin is formed.

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