A method for assembling the centering of the arc extinguishing chamber of a circuit breaker

Abstract

The invention relates to a method for assembling a circuit breaker arc extinguishing chamber centering tool. The circuit breaker is supported as a whole and a driving force is provided by a supporting tool. A main contact centering tool is sleeved on a piston rod of a cylinder in the arc extinguishing chamber. The piston rod is driven to move horizontally by the supporting tool to be centered with a static main contact of the arc extinguishing chamber. An arc contact centering tool is sleeved on a static arc contact. The static arc contact is moved to be centered with a moving arc contact at the end of the cylinder. A centering gap is provided between the main contact centering tool and the static main contact, and between the arc contact centering tool and the moving arc contact. A multimeter is used to connect the piston rod and the static main contact, as well as the piston rod and the static arc contact. Whether the centering is qualified is accurately determined by the change of the multimeter value, thereby reducing the difficulty of assembly, ensuring the overall quality of assembly, realizing the feasibility of assembling an arc extinguishing chamber of a central mechanism, improving the overall efficiency and effect of arc extinguishing chamber assembly, and having good practicality and promotion prospects.

Description

Technical Field

[0001] The invention relates to the technical field of high-voltage switch circuit breakers, and in particular to a method for centering and assembling an arc extinguishing chamber of a circuit breaker. Background Art

[0002] With the rapid development of all walks of life in my country, the transmission capacity is increasing, the voltage level of the transmission line is increasing, and the short-circuit current is increasing. Therefore, it is a very urgent task to develop a new type of high-voltage switch circuit breaker to meet the needs of the power grid. Most of the existing 550kV high-voltage switch circuit breakers are in the form of hydraulic mechanisms installed on one side. With the continuous improvement of the requirements of the power grid, this type of mechanism circuit breaker has reached its limit and can no longer meet the requirements of the power grid; therefore, a new SF6 hydraulic spring mechanism center circuit breaker was developed. This SF6 hydraulic spring mechanism center circuit breaker includes a horizontally arranged transmission chamber, and two arc extinguishing chambers are fixed symmetrically along the center on both sides of the transmission chamber. The hydraulic spring mechanism drives the transmission chamber through the transmission structure of the crank arm and the connecting rod to convert the vertical movement of the insulating pull rod into the horizontal movement of the horizontal pull rod, thereby driving the closing and opening effects between the moving and static contacts in the arc extinguishing chamber. This circuit breaker greatly improves the performance of the circuit breaker and can adapt to the increasing parameters of the power grid; the change in the arc extinguishing chamber structure of the center mechanism circuit breaker makes the existing assembly tooling unusable, and the design of a new assembly tooling becomes a necessary task. Summary of the invention

[0003] The present invention aims at the deficiencies of the prior art, realizes the feasibility of assembling the arc extinguishing chamber of the central mechanism, and improves the overall efficiency and effect of the arc extinguishing chamber assembly.

[0004] The present invention is realized by the following technical scheme: a method for assembling the arc extinguishing chamber of a circuit breaker, wherein the circuit breaker comprises a transmission chamber and an arc extinguishing chamber, the arc extinguishing chamber is provided with a static main contact and a static arc contact, a cylinder is fixed to the side wall of the transmission chamber, a moving arc contact is fixed to the end of the piston rod of the cylinder, a supporting tool and a main contact centering tool are required for centering, the supporting tool comprises a supporting frame and a screw drive mechanism, the supporting frame is fixed to the bottom of the transmission chamber to support the circuit breaker as a whole, and the movable end of the screw drive mechanism is connected to the insulating pull rod of the transmission chamber;

[0005] The main contact centering tool comprises a first and a second coaxially fixed ring, the inner diameter of the first ring is the same as the outer diameter of the piston rod and the inner diameter of the static main contact, and a centering gap is provided between the outer wall of the second ring and the inner wall of the first ring, and the centering gap is not greater than 0.2 mm;

[0006] A main contact alignment method is provided for aligning a static main contact and a piston rod, comprising the following steps:

[0007] Step 1: Rotate the screw drive mechanism to drive the insulating pull rod to move up and down to test the stability of the connection;

[0008] Step 2: the first circular ring is sleeved on the outer wall of the piston rod, and the inner wall of the first circular ring is in close contact with the outer wall of the piston rod;

[0009] Step 3: Bolt the bolt fixing holes of the arc extinguishing chamber and the transmission chamber to make the static main contact and the piston rod preliminarily aligned;

[0010] Step 4, rotating the screw drive mechanism to make it move vertically upward to drive the piston rod to slide horizontally outward to close the circuit breaker, and stopping the movement when the second ring is inserted into the inner cavity of the static main contact;

[0011] Step 5: Use a multimeter to perform the initial alignment test. Connect the multimeter to the piston rod and the static main contact for measurement. If the multimeter value returns to zero, it means that the outer wall of the second ring and the inner wall of the static main contact are not in contact, and the multimeter measurement cannot form a path, then the alignment is qualified; on the contrary, the outer wall of the second ring and the inner wall of the static main contact are in contact to form a path, and the multimeter measurement changes the value, then there is an alignment error;

[0012] Step 6: If there is a centering error, move the arc extinguishing chamber to fine-tune the fixed gap of the bolt fixing hole to accurately align the static main contact with the piston rod until the multimeter measurement value returns to zero and the centering is determined to be qualified;

[0013] Step seven, after the alignment is qualified, tighten the bolts of the arc extinguishing chamber and the transmission chamber to complete the assembly and fixation.

[0014] This solution can provide overall support for the circuit breaker during assembly through the support tooling, thus realizing the feasibility of arc extinguishing chamber assembly; it has the function of slow opening and closing of the moving and static contacts in the arc extinguishing chamber, and can stop the piston rod at any position according to assembly requirements, meeting the requirements of fracture centering and assembly inspection, thus solving the problem that the circuit breaker mechanism cannot be accurately stopped for arc extinguishing chamber assembly;

[0015] The piston rod and the static main contact are precisely aligned through the main contact alignment tooling, and the alignment gap is controlled within 0.2mm. After assembly, the process requirements are met with reliable quality, the assembly difficulty is reduced, and it is easy to inspect and manufacture.

[0016] As an optimization, when centering, an arc contact centering tool is also required. The arc contact centering tool is a round tube structure. The end of the round tube is fixed with a convex cylinder. The inner diameter of the round tube is the same as the outer diameter of the static arc contact and the inner diameter of the moving arc contact. A centering gap is provided between the outer wall of the cylinder and the inner wall of the round tube. The centering gap is not greater than 0.2 mm. This optimization scheme realizes the precise centering of the static arc contact and the moving arc contact through the arc contact centering tool.

[0017] As an optimization, a method for centering an arc contact is also provided for centering a static arc contact and a moving arc contact, comprising the following steps:

[0018] Step eight, after step seven, sleeve the circular tube onto the static arc contact, so that the inner wall of the circular tube and the outer wall of the static arc contact are in close contact;

[0019] Step nine, moving the static arc contact so that the cylinder stops when it is inserted into the inner cavity of the moving arc contact;

[0020] Step 10, use a multimeter to measure the static arc contact and the piston rod. If the multimeter value returns to zero, it means that the outer wall of the cylinder and the inner wall of the moving arc contact are not in contact and cannot form a path, and it is judged that the alignment is qualified; on the contrary, the outer wall of the cylinder and the inner wall of the moving arc contact are in contact to form a path, and the multimeter measurement value changes, then there is an alignment error;

[0021] Step 11: If there is a centering error, move the static arc contact to align the static arc contact with the moving arc contact accurately until the multimeter returns to zero and the centering is determined to be qualified;

[0022] Step 12: After the alignment is qualified, the static arc contact and the arc extinguishing chamber are assembled and fixed by bolts.

[0023] This optimization scheme controls the centering gap between the static arc contact and the moving arc contact within 0.2mm. After assembly, it meets the process requirements with reliable quality, reduces the difficulty of assembly, is easy to inspect and manufacture, and realizes the feasibility of assembly centering.

[0024] As an optimization, a nozzle is provided at the end of the cylinder, the moving arc contact is located in the nozzle, the outer diameter of the round tube is smaller than the inner diameter of the nozzle, and the round tube is inserted into the nozzle and keeps a non-contact state with the nozzle during centering. This optimization scheme prevents the arc contact tooling from forming a passage after contacting the nozzle during centering, causing measurement errors.

[0025] As an optimization, in step 13, after step 12, the screw drive mechanism is rotated downward to drive the piston rod to slide horizontally inward to open the gate, so that the second ring is separated from the inner cavity of the static main contact, and after the cylinder is separated from the nozzle, the main contact centering tool and the arc contact centering tool are taken out. This optimization scheme facilitates the removal of the main contact centering tool and the arc contact.

[0026] The beneficial effects of the present invention are as follows: this centering assembly method uses a tool to measure the key dimensions of the arc extinguishing chamber after the assembly is completed when there is no hydraulic mechanism to provide opening and closing power and the circuit breaker is not assembled as a whole, thereby ensuring the overall quality of the assembly, realizing the feasibility of assembling the arc extinguishing chamber with a central mechanism, improving the overall efficiency and effect of the arc extinguishing chamber assembly, reducing the difficulty of assembly, having the characteristics of structural inspection, easy manufacturing, high efficiency and reliability, etc., and having good practicality and promotion prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a structural diagram of the main contact centering tooling of the present invention;

[0028] Figure 2 This is a schematic diagram of the centering effect of the main contact centering tooling of the present invention;

[0029] Figure 3 This is a structural diagram of the arc contact centering tooling of the present invention;

[0030] Figure 4 This is a schematic diagram of the centering effect of the arc contact centering tooling of the present invention;

[0031] Figure 5 This is a schematic diagram of closing the circuit breaker after assembly is completed;

[0032] As shown in the figure:

[0033] 1. Support tooling, 111. Support frame, 112. Screw drive mechanism, 2. Arc extinguishing chamber, 3. Transmission chamber, 31. Connecting rod, 32. Crank arm, 33. Insulating pull rod, 4. Cylinder, 41. Cylinder body, 42. Piston rod, 5. Static main contact, 6. Static arc contact, 7. Main contact centering tooling, 71. First ring, 72. Second ring, 8. Arc contact centering tooling, 81. Cylinder, 82. Round tube, 9. Moving arc contact, 10. Nozzle, 11. Screw, 12. Hoop, 13. Connecting rod, 14. Sealing cover. DETAILED DESCRIPTION

[0034] In order to clearly illustrate the technical features of this solution, this solution is described below through a specific implementation method. The circuit breaker of this embodiment is a center-mounted circuit breaker, including a horizontally arranged transmission chamber 3, two arc extinguishing chambers 2 are fixedly connected symmetrically along the center on both sides of the transmission chamber 3, and the arc extinguishing chamber 2 is equipped with a static main contact 5 and a static arc contact 6, and a cylinder 4 is fixed to the side wall of the transmission chamber, and a moving arc contact 9 is fixed to the end of the piston rod 42 of the cylinder.

[0035] like Figures 1 to 5 As shown, a method for assembling the centering of the arc extinguishing chamber of a circuit breaker, the centering requires the use of a support tool 1, a main contact centering tool 7 and an arc contact centering tool 8;

[0036] The support fixture 1 includes a support frame 111 and a screw drive mechanism 112. The support frame 111 includes a bottom plate and four vertical support columns fixed to the bottom plate. The support frame is made of aluminum alloy. The support frame 111 is fixed to the bottom of the transmission chamber 3 to support the circuit breaker as a whole. The movable end of the screw drive mechanism is connected to the insulating pull rod 33 of the transmission chamber.

[0037] The screw drive mechanism 112 includes a fixing frame fixedly connected to the support frame 111 , on which a screw 11 is rotatably mounted. The screw rotates vertically up and down, and a connecting rod 13 is clamped at the upper end of the screw through a hoop 12 .

[0038] The main contact centering tool 7 includes a first circular ring 71 and a second circular ring 72 that are coaxially fixed. The inner diameter of the first circular ring 71 is the same as the outer diameter of the piston rod 42 and the inner diameter of the static main contact 5. A centering gap is provided between the outer wall of the second circular ring 72 and the inner wall of the first circular ring 71, and the centering gap is not greater than 0.2 mm.

[0039] The arc contact centering tooling 8 is a circular tube structure, and an outwardly protruding cylinder 81 is fixedly connected to the end of the circular tube 82. The inner diameter of the circular tube 82 is the same as the outer diameter of the static arc contact 6 and the inner diameter of the moving arc contact 9. A centering gap is provided between the outer wall of the cylinder 81 and the inner wall of the circular tube 82, and the centering gap is not greater than 0.2 mm.

[0040] Specifically, before centering, a cylinder 4 is installed on the left and right outer walls of the transmission chamber 3, and the piston rod 42 of the cylinder is horizontally slidably arranged in the cylinder body 41 of the cylinder. One end of the piston rod 42 extends into the transmission chamber 3 and is connected to the vertical insulating pull rod 33 through the crank arm 32 and the connecting rod 31, so that the vertical movement of the insulating pull rod 33 is converted into the horizontal movement of the piston rod 42; specifically, the lower end of the insulating pull rod 33 is fixedly connected to the upper end of the connecting rod 13, and a sealing cover 14 is installed at the connection between the insulating pull rod and the connecting rod, and the shaft is sealed and protected by the sealing cover 14.

[0041] Before centering, a static main contact 5 is fixedly connected to the side wall of the arc extinguishing chamber 2, and the inner diameter of the static main contact 5 is the same as the outer diameter of the piston rod 42; a moving arc contact 9 is provided at the other end of the piston rod, and the outer diameter of the static arc contact 6 is the same as the inner diameter of the moving arc contact 9; a nozzle 10 is provided at the end of the cylinder 4, and the moving arc contact 9 is located in the nozzle 10, the outer diameter of the circular tube is smaller than the inner diameter of the nozzle, and the moving arc contact, nozzle and piston rod are coaxially arranged.

[0042] The circuit breaker arc extinguishing chamber centering assembly method of the present invention provides a main contact alignment method for centering the static main contact 5 and the piston rod 42, comprising the following steps:

[0043] Step 1: Rotate the screw drive mechanism 112 to drive the insulating pull rod 33 to move up and down to test the stability of the connection;

[0044] Step 2: the first ring 71 is sleeved on the outer wall of the piston rod 42, and the inner wall of the first ring is in close contact with the outer wall of the piston rod;

[0045] Step 3, bolt the arc extinguishing chamber 2 and the transmission chamber 3 through the bolt fixing holes to preliminarily align the static main contact 5 and the piston rod 42;

[0046] Step 4, rotating the screw drive mechanism 112 to make it move vertically upward to drive the piston rod 42 to slide horizontally outward to close the circuit breaker, so that the second ring 72 stops moving when it is inserted into the inner cavity of the static main contact 5;

[0047] Step 5: Use a multimeter to perform the initial centering test. Connect the multimeter to the piston rod 42 and the static main contact 5 for measurement. If the multimeter value returns to zero, it means that the outer wall of the second ring 72 and the inner wall of the static main contact 5 are not in contact, and the multimeter measurement cannot form a path, then it is judged that the centering is qualified; on the contrary, the outer wall of the second ring and the inner wall of the static main contact are in contact to form a path, and the multimeter measurement changes the value, then there is a centering error;

[0048] Step 6: If there is a centering error, move the arc extinguishing chamber 2 to fine-tune the fixed gap of the bolt fixing hole, so that the static main contact 5 and the piston rod 42 are accurately aligned, until the multimeter measurement value returns to zero and the alignment is determined to be qualified;

[0049] Step seven, after the alignment is qualified, tighten the bolts of the arc extinguishing chamber 2 and the transmission chamber 3 to complete the assembly and fixation.

[0050] A method for centering the static arc contact 6 and the moving arc contact 9 is also provided, comprising the following steps:

[0051] Step eight, after step seven, the circular tube 82 is put on the static arc contact 6, and the inner wall of the circular tube and the outer wall of the static arc contact are in close contact;

[0052] Step nine, moving the static arc contact 6 so that the cylinder 81 is inserted into the inner cavity of the moving arc contact 9 and stops;

[0053] Step 10, use a multimeter to measure the static arc contact 6 and the piston rod 42. If the multimeter value returns to zero, it means that the outer wall of the cylinder 81 and the inner wall of the moving arc contact 9 are not in contact and cannot form a path, and it is judged that the alignment is qualified; on the contrary, the outer wall of the cylinder and the inner wall of the moving arc contact are in contact to form a path, and the multimeter measurement value changes, then there is an alignment error;

[0054] Step 11: If there is a centering error, move the static arc contact 6 to accurately align the static arc contact 6 with the moving arc contact 9 until the multimeter returns to zero and the centering is determined to be qualified;

[0055] Step 12: After the alignment is qualified, the static arc contact 6 and the arc extinguishing chamber 2 are assembled and fixed by bolts;

[0056] Step thirteen, after step twelve, rotate the screw drive mechanism 112 downward to drive the piston rod 42 to slide horizontally inward to open the gate, so that the second ring 72 is separated from the inner cavity of the static main contact 5, and after the cylinder 81 is separated from the nozzle 10, the main contact centering tool 7 and the arc contact centering tool 8 are taken out.

[0057] After centering, the piston rod 42 is coaxially arranged with the static main contact 5, and the static arc contact 6 and the moving arc contact 9 are coaxially arranged. The closing and opening effects of the circuit breaker are achieved through the contact and separation of the outer wall of the piston rod and the inner wall of the static main contact, and the contact and separation of the inner wall of the moving arc contact and the outer wall of the static arc contact.

[0058] Of course, the above description is not limited to the above examples. Technical features not described in the present invention can be achieved by or by using existing technologies, which will not be described here. The above embodiments and drawings are only used to illustrate the technical scheme of the present invention and are not limitations of the present invention. The present invention is described in detail with reference to the preferred implementation methods. Ordinary technicians in this field should understand that changes, modifications, additions or substitutions made by ordinary technicians in this technical field within the essential scope of the present invention do not depart from the purpose of the present invention, and should also fall within the scope of protection of the claims of the present invention.

Claims

1. A method for aligning and assembling an arc extinguishing chamber of a circuit breaker, the circuit breaker comprising a transmission chamber (3) and an arc extinguishing chamber (2), the arc extinguishing chamber being provided with a static main contact (5) and a static arc contact (6), a cylinder (4) being fixed to a side wall of the transmission chamber, a moving arc contact (9) being fixed to the end of a piston rod (42) of the cylinder, Features: A support tool (1) and a main contact centering tool (7) are required for centering. The support tool (1) comprises a support frame (111) and a screw drive mechanism (112). The support frame (111) is fixedly connected to the bottom of the transmission chamber (3) to support the circuit breaker as a whole. The movable end of the screw drive mechanism (112) is connected to the insulating pull rod (33) of the transmission chamber. The main contact centering tool (7) comprises a first circular ring (71) and a second circular ring (72) which are coaxially fixed, the inner diameter of the first circular ring (71) being the same as the outer diameter of the piston rod (42) and the inner diameter of the static main contact (5), and a centering gap is provided between the outer wall of the second circular ring (72) and the inner wall of the first circular ring (71), and the centering gap is not greater than 0.2 mm; A main contact alignment method is provided for aligning a stationary main contact (5) and a piston rod (42), comprising the following steps: Step 1, rotating the screw drive mechanism (112) to drive the insulating pull rod (33) to move up and down, to test the stability of the connection; Step 2: the first circular ring (71) is sleeved on the outer wall of the piston rod (42), and the inner wall of the first circular ring is in close contact with the outer wall of the piston rod; Step 3, bolt the arc extinguishing chamber (2) and the transmission chamber (3) through the bolt fixing holes to initially align the static main contact with the piston rod; Step 4, rotating the screw drive mechanism (112) to make it move vertically upward to drive the piston rod (42) to slide horizontally outward to close the switch, and stopping the movement when the second ring (72) is inserted into the inner cavity of the static main contact (5); Step 5: Use a multimeter to perform an initial alignment test. Connect the multimeter to the piston rod (42) and the static main contact (5) for measurement. If the multimeter value returns to zero, it means that the outer wall of the second ring (72) and the inner wall of the static main contact (5) are not in contact, and the multimeter measurement cannot form a path, and it is judged that the alignment is qualified; on the contrary, the outer wall of the second ring and the inner wall of the static main contact are in contact to form a path, and the multimeter measurement value changes, then there is an alignment error; Step 6: If there is a centering error, move the arc extinguishing chamber (2) to fine-tune the fixed clearance of the bolt fixing hole so that the static main contact and the piston rod are accurately aligned until the multimeter measurement value returns to zero and the alignment is determined to be qualified; Step 7: After the alignment is qualified, the bolts of the arc extinguishing chamber (2) and the transmission chamber (3) are tightened to complete the assembly and fixation; During centering, an arc contact centering tool (8) is also required. The arc contact centering tool is a circular tube structure. An outwardly convex cylinder (81) is fixedly connected to the end of the circular tube (82). The inner diameter of the circular tube is the same as the outer diameter of the static arc contact and the inner diameter of the moving arc contact. A centering gap is provided between the outer wall of the cylinder (81) and the inner wall of the circular tube (82). The centering gap is not greater than 0.2 mm. A method for centering an arc contact is also provided for centering a static arc contact (6) and a moving arc contact (9), comprising the following steps: Step eight, after step seven, sleeve the circular tube (82) onto the static arc contact (6), with the inner wall of the circular tube and the outer wall of the static arc contact in close contact; Step nine, moving the static arc contact (6) so that the cylinder (81) is inserted into the inner cavity of the moving arc contact (9) and stops; Step 10, using a multimeter to measure the static arc contact (6) and the piston rod (42), if the multimeter value returns to zero, it means that the outer wall of the cylinder (81) and the inner wall of the moving arc contact (9) are not in contact and cannot form a path, and it is judged that the alignment is qualified; on the contrary, the outer wall of the cylinder and the inner wall of the moving arc contact are in contact to form a path, and the value measured by the multimeter changes, then there is an alignment error; Step 11: If there is a centering error, move the static arc contact (6) to accurately align the static arc contact with the moving arc contact until the multimeter returns to zero and the centering is determined to be qualified; Step 12: After the alignment is qualified, the static arc contact (6) and the arc extinguishing chamber (2) are assembled and fixed by bolts.

2. A circuit breaker arc extinguishing chamber centering assembly method according to claim 1, Features: A nozzle (10) is provided at the end of the cylinder (4), the moving arc contact (9) is located in the nozzle, the outer diameter of the round tube (82) is smaller than the inner diameter of the nozzle (10), and the round tube is inserted into the nozzle and maintains a non-contact state with the nozzle during centering.

3. A circuit breaker arc extinguishing chamber centering assembly method according to claim 2, Features: Step thirteen, after step twelve, the screw drive mechanism (112) is rotated downward to drive the piston rod (42) to slide horizontally inward to open the gate, so that the second ring (72) is separated from the inner cavity of the static main contact (5), and after the cylinder (81) is separated from the nozzle (10), the main contact centering tool (7) and the arc contact centering tool (8) are taken out.

Images