Voltage-sharing indoor vacuum circuit breaker

Abstract

The invention discloses an adjustable voltage-sharing indoor vacuum circuit breaker with good stability. According to the technical scheme, the device comprises side plates arranged oppositely, an upper cross beam installed at the upper ends of the side plates, a main shaft and a grounding beam installed in the middles of the side plates, and a pole installed at the bottoms of the side plates, the upper cross beam is provided with T-shaped static contacts distributed in a three-phase mode, the main shaft is provided with moving contacts distributed in a three-phase mode, and the moving contacts are connected with the grounding beam. The grounding beam is provided with three-phase distributed grounding contacts, the pole is provided with three-phase distributed vacuum arc-extinguishing chambers, the lower end of the moving contact is connected to the vacuum arc-extinguishing chambers, the rear end of the T-shaped static contact is provided with a voltage-sharing mechanism, the voltage-sharing mechanism comprises a buffer pad, a T-shaped baffle plate and a voltage-sharing ring, and the T-shaped baffle plate is connected with the T-shaped static contact. A square through hole is formed in the center of the buffer pad, the buffer pad sleeves a square positioning part at the rear end of the T-shaped static contact, and the T-shaped baffle plate and the grading ring are sequentially arranged at the rear end of the buffer pad and are connected with the T-shaped static contact through a group of screw rods.

Description

Technical Field

[0001] The invention belongs to the field of electric power equipment, and in particular relates to an indoor vacuum circuit breaker. Background Art

[0002] The vacuum circuit breaker is an important switchgear in the power system. Its structure includes: side plates arranged opposite to each other, an upper crossbeam installed on the upper end of the side plate, a main shaft and a grounding beam installed in the middle of the side plate, and a pole installed at the bottom of the side plate. A three-phase T-shaped static contact is arranged on the upper crossbeam, a three-phase moving contact (moving blade) is arranged on the main shaft, a three-phase grounding contact is arranged on the grounding beam, and a three-phase vacuum arc extinguishing chamber is arranged on the pole, and the lower end of the moving contact is connected to the vacuum arc extinguishing chamber. When the vacuum circuit breaker is in the on state, high voltage will be generated at its terminal and at the connection point between the copper busbar and the high-voltage equipment, resulting in local electric field concentration and uneven electric field distribution, which will cause premature aging of the vacuum circuit breaker, and easily cause arc flashover, resulting in insulation damage. To solve this problem, it is traditional to install a grading ring at the rear end of the static contact or a grading cover on the moving contact. However, there are still some disadvantages: 1. Since the traditional moving contact and the static contact collide hard when closing, it is easy to cause burrs on the edge of the moving contact, which aggravates the arc flashover phenomenon; 2. Since the traditional moving contact and the static contact collide hard when closing, it will produce more vibration, which may easily cause the voltage-equalizing ring or the voltage-equalizing cover to loosen or fall off; 3. The installation position of the vacuum interrupter and the moving contact cannot be adjusted, resulting in very strict requirements on the size and installation of the moving contact and the static contact, which brings inconvenience to production and assembly. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide an indoor vacuum circuit breaker with good stability and adjustable voltage sharing.

[0004] To solve the above problems, the technical solution adopted by the present invention includes: side plates are arranged relatively to each other, an upper cross beam is installed on the upper end of the side plate, a main shaft and a grounding beam are installed in the middle of the side plate, and a pole is installed at the bottom of the side plate, the upper cross beam is provided with a three-phase distributed T-type static contact, the main shaft is provided with a three-phase distributed moving contact, the grounding beam is provided with a three-phase distributed grounding contact, the pole is provided with a three-phase distributed vacuum arc extinguishing chamber, the lower end of the moving contact is connected to the vacuum arc extinguishing chamber, and it is characterized in that: a pressure equalizing mechanism is provided at the rear end of the T-type static contact, and the pressure equalizing mechanism includes a buffer pad, a T-type baffle and a pressure equalizing ring, a square through hole is provided in the center of the buffer pad, and a square positioning portion is sleeved on the rear end of the T-type static contact, the T-type baffle and the pressure equalizing ring are sequentially arranged at the rear end of the buffer pad, and are connected to the T-type static contact through a group of screws.

[0005] The voltage-equalizing indoor vacuum circuit breaker is characterized in that voltage-equalizing covers are provided on both sides of the top of the moving contact.

[0006] The voltage-equalizing indoor vacuum circuit breaker is characterized in that: a locking nut assembly connected to the voltage-equalizing cover is provided on the top of the moving contact, the locking nut assembly includes a locking nut screw, a locking sub-screw threaded on the front end of the locking nut screw and a shaft sleeve sleeved on the middle part of the locking nut screw, the rear ends of the locking nut screw and the locking sub-screw are both sleeved with a reset spring, and the lower end of the voltage-equalizing cover is provided with a screw hole for the locking nut screw and the locking sub-screw to pass through and a spring accommodating chamber for accommodating the reset spring.

[0007] The voltage-equalizing indoor vacuum circuit breaker is characterized in that: the moving contact has two bubble points that are integrally stamped and formed above the locking nut assembly corresponding to the moving contact, and two positioning holes are provided behind the bubble points corresponding to the moving contact, and the upper end of the voltage-equalizing cover is provided with a first positioning column that is positioned and matched with the positioning holes.

[0008] The voltage-equalizing indoor vacuum circuit breaker is characterized in that: the width of the buffer pad is the same as that of the T-shaped baffle, and an isolation portion extends downward from the lower end of the buffer pad, the width and height of the voltage-equalizing ring are both greater than those of the T-shaped baffle, and the lower end of the isolation portion is aligned with the lower end of the voltage-equalizing ring.

[0009] The voltage-equalizing indoor vacuum circuit breaker is characterized in that the voltage-equalizing ring comprises an elliptical bottom plate and an elliptical convex ring integrally formed on the edge of the elliptical bottom plate.

[0010] The voltage-equalizing indoor vacuum circuit breaker is characterized in that: a sheath wrapped around the moving contact is integrally formed on the main shaft, and a U-shaped positioning opening is provided on the top of the sheath, and positioning ribs that abut against the moving contact and the voltage-equalizing cover are respectively provided in the U-shaped positioning opening, and a positioning groove that cooperates with the U-shaped positioning opening is provided on the pressure-equalizing cover.

[0011] The voltage-equalizing indoor vacuum circuit breaker is characterized in that a column pole insert and a T-shaped connector are provided on the top of the vacuum arc extinguishing chamber, and an adjusting nut is provided in the column pole insert, and the installation position of the T-shaped connector is adjusted by the adjusting nut, and the T-shaped connector is connected to the lower end of the moving contact.

[0012] The voltage-equalizing indoor vacuum circuit breaker is characterized in that: the T-shaped connector is covered with an insulating positioning sleeve, the insulating positioning sleeve is provided with first positioning holes on both sides of the rear end, and a positioning plate is provided at the bottom of the front end, at least two second positioning holes are provided on the circumferential surface of the positioning plate, the pole is provided with a second positioning column that is positioned and matched with the first positioning hole and a third positioning column that is positioned and matched with the second positioning hole, and the second positioning column is clamped on both sides of the T-shaped connector.

[0013] The voltage-equalizing indoor vacuum circuit breaker is characterized in that the buffer pad is made of polyurethane and has a thickness of 2-5 mm.

[0014] The advantages of the voltage-equalizing indoor vacuum circuit breaker of the present invention are as follows: 1. The voltage-equalizing mechanism is provided with a buffer pad and a baffle to alleviate the hard impact of the moving blade when closing the switch, protect the blade from burrs, thereby preventing arc flashover, and also solves the problem that the voltage-equalizing ring and the voltage-equalizing cover are easy to loosen due to vibration; 2. The installation position of the vacuum interrupter and the moving contact is adjustable, which is easier to produce and assemble.

[0015] The present invention will be further described below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the voltage-equalizing indoor vacuum circuit breaker of the present invention; Figure 2 is a cross-sectional view of a voltage-equalizing indoor vacuum circuit breaker of the present invention; Figure 3 is an exploded view of the pressure equalizing mechanism of the present invention; Figure 4 is a cross-sectional view of the pressure equalizing mechanism of the present invention; Figure 5 is a cross-sectional view of the movable contact of the present invention; Figure 6 is an exploded view of the movable contact of the present invention; Figure 7 is a cross-sectional view of the vacuum interrupter of the present invention; Figure 8 is an exploded view of the vacuum interrupter of the present invention; Fig. 9 It is a schematic diagram of the installation of the pole and the moving contact of the present invention; Fig.10 It is a structural schematic diagram of the main shaft of the present invention. DETAILED DESCRIPTION

[0017] Reference Figure 1-10 As shown, the voltage-equalizing indoor vacuum circuit breaker of the present invention comprises side plates 1 arranged opposite to each other, an upper crossbeam 2 installed on the upper end of the side plate 1, a main shaft 3 and a grounding beam 4 installed in the middle of the side plate 1, and a pole 5 installed at the bottom of the side plate 1. A three-phase distributed T-shaped static contact 6 is provided on the upper crossbeam 2, and a three-phase distributed moving contact 7 is provided on the main shaft 3. A three-phase distributed grounding contact 8 is provided on the grounding beam 4, and a three-phase distributed vacuum arc extinguishing chamber 9 is provided on the pole 5, and the lower end of the moving contact 7 is connected to the vacuum arc extinguishing chamber 9. A voltage-equalizing mechanism 10 is provided at the rear end of the T-shaped static contact 6, and the voltage-equalizing mechanism 10 comprises a buffer pad 11, a T-shaped baffle 12 and a voltage-equalizing ring 13. A square through hole 14 is provided in the center of the buffer pad 11, and a square positioning portion 15 at the rear end of the T-shaped static contact 6 is sleeved through the square through hole 14. The T-shaped baffle 12 and the pressure equalizing ring 13 are sequentially arranged at the rear end of the buffer pad 11 , and are connected to the T-shaped static contact 6 via a set of screws 16 .

[0018] Preferably, pressure equalizing covers 17 are provided on both sides of the top of the moving contact 7, and the pressure equalizing covers 17 are integrally stamped from aluminum. A locking nut assembly 18 connected to the pressure equalizing cover 17 is provided on the top of the moving contact 7, and the locking nut assembly 18 includes a locking nut screw 19, a locking sub-screw 20 screwed to the front end of the locking nut screw 19, and a shaft sleeve 21 sleeved on the middle part of the locking nut screw 19, and the rear ends of the locking nut screw 19 and the locking sub-screw 20 are sleeved with a reset spring 22, and the lower end of the pressure equalizing cover 17 is provided with a screw hole 23 for the locking nut screw 19 and the locking sub-screw 20 to pass through and a spring accommodating chamber 24 for accommodating the reset spring 22. Compared with the traditional fixing method of setting screws at both ends of the connecting shaft, the above-mentioned locking nut assembly 18 is more convenient to assemble and not easy to fall off.

[0019] Preferably, the moving contact 7 is integrally stamped with two bubble points 25 in contact with the T-shaped static contact 6 corresponding to the upper side of the locking nut assembly 18, and two positioning holes 26 are provided corresponding to the rear of the bubble points 25, and the upper end of the pressure equalizing cover 17 is provided with a first positioning column 27 that is positioned and matched with the positioning holes 26. Through the positioning and matching of the first positioning column 27 and the positioning hole 26, the stability of the connection of the pressure equalizing cover 17 can be greatly improved, and it can effectively prevent it from falling off due to hard impact.

[0020] Preferably, the width of the buffer pad 11 is the same as that of the T-shaped baffle 12, and an isolating portion 28 extends downward from the lower end of the buffer pad 11, the width and height of the equalizing ring 13 are greater than the T-shaped baffle 12, and the lower end of the isolating portion 28 is aligned with the lower end of the equalizing ring 13. After adopting the above structure, the movable contact 7 and the equalizing ring 13 can be effectively separated by the isolating portion 28 of the buffer pad 11, and at the same time, due to the presence of the T-shaped baffle 12, a gap is formed between the movable contact 7 and the equalizing ring 13, thereby effectively preventing the arc flashover phenomenon between the movable contact 7 and the equalizing ring 13.

[0021] Preferably, the pressure equalizing ring 13 comprises an elliptical bottom plate 29 and an elliptical convex ring 30 integrally formed on the edge of the elliptical bottom plate 29. This structure has the advantages of convenient installation and good pressure equalizing effect.

[0022] Preferably, a sheath 31 wrapped around the moving contact 7 is integrally formed on the main shaft 3, and a U-shaped positioning opening 32 is provided on the top of the sheath 31, and positioning ribs 33 are respectively provided in the U-shaped positioning opening 32 to abut against the moving contact 7 and the voltage-equalizing cover 17, and a positioning groove 34 is provided on the voltage-equalizing cover 17 to cooperate with the U-shaped positioning opening 32. The moving contact 7 and the voltage-equalizing cover 17 are fixed by the top structure of the sheath 31, so as to further improve the stability and impact resistance of the installation of the voltage-equalizing cover 17.

[0023] Preferably, a column pole insert 35 and a T-shaped connector 37 are provided on the top of the vacuum interrupter 9, and an adjusting nut 36 is screwed into the column pole insert 35. The column pole insert 35 is embedded in the pole 5. The installation position of the T-shaped connector 37 is adjusted by the adjusting nut 36. When the adjusting nut 36 is screwed out upward, the position of the T-shaped connector 37 can be lifted. When the position of the T-shaped connector 37 is adjusted, it is connected to the vacuum interrupter 9 by installing a screw in the T-shaped connector 37. The T-shaped connector 37 is connected to the lower end of the moving contact 7, thereby realizing the adjustment of the upper and lower positions of the moving contact 7.

[0024] Preferably, the T-shaped connector 37 is covered with an insulating positioning sleeve 38, and the insulating positioning sleeve 38 is provided with first positioning holes 39 on both sides of the rear end, and the insulating positioning sleeve 38 is provided with a positioning plate 40 at the bottom of the front end, and the positioning plate 40 is provided with two second positioning holes 41 on the circumferential surface. The pole 5 is provided with a second positioning column 42 that is positioned and matched with the first positioning hole 39 and a third positioning column 43 that is positioned and matched with the second positioning hole 41, and the second positioning column 42 is clamped on both sides of the T-shaped connector 37. Through the above-mentioned installation structure, the stability of the installation of the T-shaped connector 37 and the determination of the installation direction are improved, thereby realizing the determination of the installation direction of the moving contact 7.

[0025] Preferably, the buffer pad 11 is made of polyurethane and has a thickness of 2-5 mm to achieve optimal strength and buffering requirements.

[0026] The above does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with this profession can make some changes or modifications to equivalent embodiments of the structure and technical content disclosed above without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiment according to the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A voltage-equalizing indoor vacuum circuit breaker, comprising side plates (1) arranged opposite to each other, an upper crossbeam (2) mounted on the upper end of the side plate (1), a main shaft (3) and a grounding beam (4) mounted on the middle of the side plate (1), and a pole (5) mounted on the bottom of the side plate (1), wherein the upper crossbeam (2) is provided with a three-phase distributed T-shaped static contact (6), the main shaft (3) is provided with a three-phase distributed moving contact (7), the grounding beam (4) is provided with a three-phase distributed grounding contact (8), the pole (5) is provided with a three-phase distributed vacuum interrupter (9), the lower end of the moving contact (7) is connected to the vacuum interrupter (9), and is characterized in that: A pressure equalizing mechanism (10) is provided at the rear end of the T-shaped stationary contact (6), and the pressure equalizing mechanism (10) comprises a buffer pad (11), a T-shaped baffle plate (12) and a pressure equalizing ring (13); a square through hole (14) is provided at the center of the buffer pad (11) and is sleeved on a square positioning portion (15) at the rear end of the T-shaped stationary contact (6); the T-shaped baffle plate (12) and the pressure equalizing ring (13) are sequentially arranged at the rear end of the buffer pad (11) and are connected to the T-shaped stationary contact (6) via a set of screws (16).

2. The voltage-equalizing indoor vacuum circuit breaker according to claim 1 is characterized in that: Voltage equalizing covers (17) are provided on both sides of the top of the moving contact (7).

3. The voltage-equalizing indoor vacuum circuit breaker according to claim 2 is characterized in that: A locking nut assembly (18) connected to the voltage-equalizing cover (17) is provided at the top of the moving contact (7), the locking nut assembly (18) comprising a locking nut screw (19), a locking sub-screw (20) screwed to the front end of the locking nut screw (19), and a shaft sleeve (21) sleeved on the middle part of the locking nut screw (19), the rear ends of the locking nut screw (19) and the locking sub-screw (20) are sleeved with a reset spring (22), and a screw hole (23) for the locking nut screw (19) and the locking sub-screw (20) to pass through and a spring accommodating chamber (24) for accommodating the reset spring (22) are provided at the lower end of the voltage-equalizing cover (17).

4. The voltage-equalizing indoor vacuum circuit breaker according to claim 3 is characterized in that: The movable contact (7) is integrally stamped with two bubble points (25) in contact with the T-shaped stationary contact (6) corresponding to the locking nut assembly (18), and two positioning holes (26) are provided behind the bubble points (25). The upper end of the pressure equalizing cover (17) is provided with a first positioning column (27) that is positioned and matched with the positioning hole (26).

5. The voltage-equalizing indoor vacuum circuit breaker according to claim 1 is characterized in that: The width of the buffer pad (11) is the same as that of the T-shaped baffle (12), and an isolation portion (28) extends downward from the lower end of the buffer pad (11); the width and height of the pressure equalizing ring (13) are both greater than those of the T-shaped baffle (12), and the lower end of the isolation portion (28) is aligned with the lower end of the pressure equalizing ring (13).

6. The voltage-equalizing indoor vacuum circuit breaker according to claim 5, characterized in that: The pressure equalizing ring (13) comprises an elliptical bottom plate (29) and an elliptical convex ring (30) integrally formed on the edge of the elliptical bottom plate (29).

7. The voltage-equalizing indoor vacuum circuit breaker according to claim 3 is characterized in that: The main shaft (3) is integrally formed with a sheath (31) that wraps around the moving contact (7), and a U-shaped positioning opening (32) is provided at the top of the sheath (31), positioning ribs (33) that abut against the moving contact (7) and the voltage equalizing cover (17) are provided in the U-shaped positioning opening (32), and a positioning groove (34) that cooperates with the U-shaped positioning opening (32) is provided on the voltage equalizing cover (17).

8. The voltage-equalizing indoor vacuum circuit breaker according to claim 1 is characterized in that: A column pole insert (35) and a T-shaped connector (37) are provided on the top of the vacuum interrupter (9), and an adjusting nut (36) is provided inside the column pole insert (35). The installation position of the T-shaped connector (37) is adjusted by means of the adjusting nut (36), and the T-shaped connector (37) is connected to the lower end of the moving contact (7) via the T-shaped connector (37).

9. The voltage-equalizing indoor vacuum circuit breaker according to claim 8, characterized in that: The T-shaped connector (37) is covered with an insulating positioning sleeve (38), the insulating positioning sleeve (38) is provided with first positioning openings (39) on both sides of the rear end, and a positioning plate (40) is provided at the bottom of the front end, and at least two second positioning openings (41) are provided on the circumferential surface of the positioning plate (40), the pole (5) is provided with a second positioning column (42) for positioning with the first positioning opening (39) and a third positioning column (43) for positioning with the second positioning opening (41), and the second positioning column (42) is clamped on both sides of the T-shaped connector (37).

10. The voltage-equalizing indoor vacuum circuit breaker according to claim 1, characterized in that: The buffer pad (11) is made of polyurethane and has a thickness of 2-5 mm.

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