JP3385799B2 - Disconnector - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is provided in a gas insulated switchgear in the field of electric power distribution, and the pressure in a puffer chamber becomes negative with respect to the surrounding pressure during an open circuit operation. The present invention relates to a suction puffer-type disconnector in which an arc generated between an arc contact and a movable conductor contacts a gas flow flowing into a puffer chamber, and the arc is cooled and extinguished. 2. Description of the Related Art Generally, a disconnector for a gas insulated switchgear normally only opens and closes a circuit with no load and does not open or close a current. However, depending on the specifications of the disconnector, a certain current, for example, Loop current, lead current, and lag current may be opened and closed. In this case, since not cut the current in the so-called parallel switching type only open simply contact in an insulating gas such as SF _6, suction puffer type, spray puffer type, the arc-type such as a magnetic drive form It is appropriately selected. Next, a conventional suction puffer type disconnector will be described with reference to FIGS. 4 is a cutaway front view of the entire disconnector, FIG. 5 is a cutaway front view of a part of FIG.
6 is a partially cutaway front view of FIG. 5, and FIG. 7 is a cutaway plan view of FIG. In these figures, 1 is a disconnector tank filled with an insulating gas such as SF ₆ , 2 is an upper lid that closes an opening on the upper surface of the tank 1, and 3 is an opening on both left and right side surfaces of the tank 1. , Respectively, and hermetically close the openings on both side surfaces. [0005] Reference numeral 4 denotes one bus conductor of each of the three phases which penetrates the insulating spacer 3 on the right side in an airtight manner.
The fixed-side tubular conductors 5 are respectively connected to the lower part of the inside. Reference numeral 6 denotes a fixed-side annular conductor that protrudes from the inner surface of the fixed-side tubular conductor 5, 7 denotes a fixed-side contact base having a lower portion attached to an upper surface of the fixed-side annular conductor 6 by a bolt, and 8 denotes a fixed-side contact base. 7 is a fixed contact made up of a plurality of contact pieces arranged in a ring, 9 is two annular springs provided on the outer periphery of the fixed contact 8, and 10 is a fixed side. Arc contacts 11 provided at the center of the contact base 7 are shields provided at the upper and lower portions of the fixed-side tubular conductor 5, and the upper shield 11 covers the outside of the fixed-side contact 8. The lower shield 11 covers the lower part of the fixed-side tubular conductor 5. Numeral 12 denotes the other bus conductor of each of the three phases which passes through the insulating spacer 3 on the left side in an airtight manner. The end is located at the center in the tank 1 and the movable cylindrical conductor 13 is connected to each other. Have been. Reference numeral 14 denotes a movable-side annular conductor that protrudes from the inner surface of the movable-side tubular conductor 13, and reference numeral 15 denotes a movable-side contact stand whose upper portion is attached to the lower surface of the movable-side annular conductor 14 with bolts. Reference numeral 16 denotes a movable contact provided at a lower portion of the movable contact base 15 and includes a plurality of ring-shaped contact pieces. Reference numeral 17 denotes a movable contact provided on the outer periphery of the movable contact 16.
The annular springs 18 are shields provided below the movable-side tubular conductor 13 and cover the outside of the movable-side contact 16. Reference numeral 19 denotes a cylinder mounted on the upper portion of the movable-side tubular conductor 13. Reference numeral 20 denotes a flange-shaped mounting plate fixed to the inner surface of the opening on the upper surface of the tank 1, reference numeral 21 denotes a disk-shaped support plate mounted on the upper surface of the mounting plate 20, and reference numeral 22 denotes a central portion of the support plate 21. A vertical guide bar provided on the lower surface, 23 is a guide bar 2
2 is a movable plate provided so as to be movable up and down;
It is a connecting plate provided on the upper surface of. Reference numeral 25 denotes a support provided on the lower surface of the support plate 21, reference numeral 26 denotes an operation shaft rotated by an operation device, reference numeral 27 denotes a link having a base fixed to the operation shaft 26, and a tip end connected to the connection plate 24. Are linked. Reference numeral 28 denotes a mechanism, which includes a mounting plate 20, a support plate 21, a guide rod 22, a moving plate 23, a connecting plate 24, a support 25, an operation shaft 26, and a link 27. Reference numeral 29 denotes three insulated operating rods each having an upper end mounted on the movable plate 23 and a lower part movable up and down in the cylinder 19, and a short cylindrical guide 30 at the tip of the operating rod 29. A cylindrical connecting member fixed through 31;
Reference numeral 2 denotes a piston fixed to the base of the coupling body 30, reference numeral 33 denotes a piston ring provided on the outer periphery of the piston 32, and a piston ring slidably in contact with the inner surface of the cylinder 19; Three guide pins, 35
Are three piston through holes formed between each guide pin 34 of the piston 32. Reference numeral 36 denotes a disc-shaped check valve that covers each piston through-hole 35, 37 denotes a through hole through which the guide 31 is formed at the center of the check valve 36, and 38 denotes a check valve. Three guide holes are formed at equal intervals on the same circumference, each guide pin 34 is inserted, and a check valve 36 is provided above each piston through hole 35 in the guide 31 and each guide pin 34. It is provided movably up and down along the road. 39 is each guide pin 3
4, which urges a check valve 36 in a direction to close each piston through-hole 35,
6 is in contact with the upper surface of the piston 32. Numeral 40 denotes a cylindrical movable conductor whose base is fixed to the distal end of the connecting body 30, which penetrates the movable contact base 15, and which is closed when the movable conductor 40 is opened from the closed state shown in FIG. By the upward movement, the lower end of the movable conductor 40 separates from the fixed contact 8 and then separates from the arc contact 10. 41 is a conductor through-hole formed through the base of the movable conductor 40,
The connecting body 30 communicates with the hollow portion of the connecting body 30 through the connecting body through hole 42. Reference numeral 43 denotes a piston ring provided inside the movable contact base 15, which is in sliding contact with the movable conductor 40, and the movable conductor 40 passes under the cylinder 19 in an airtight manner. Reference numeral 44 denotes a puffer chamber, which is formed by the cylinder 19, the movable conductor 40, the piston 32, and the movable contact stand 15. The puffer chamber 44 has a hollow portion of the piston through hole 35, the conductor through hole 41, the connecting body through hole 42, and the connecting body 30. Through the hollow portion of the movable conductor 40. Next, the operation will be described. 4 to 7 show a closed state, in which the insulating operation rod 29 and the movable conductor 40 are connected.
Is in the downward movement position, the movable conductor 40 contacts the fixed contact 8 and the arc contact 10, and the current is applied to one of the bus conductors 4, the fixed contact block 7, the fixed contact 8, and the movable conductor 4.
0, the movable contact 16, the movable contact base 15, and the other bus conductor 12. At this time, as shown in FIG.
Is provided by a coil spring 39 provided on the guide pin 34.
It is urged in a direction to close each piston through hole 35, and closes the upper side of each piston through hole 35, that is, the opposite side of the puffer chamber 44. Next, when an opening command is received, the operating shaft 26 is rotated leftward in FIG. 4 by the operating device, and the movable plate 23 moves along the guide rod 22 in the opening direction, that is, upwards, via the link 27. The movable conductor 40 moves upward while slidingly contacting the movable contact 16 via the insulating operation rod 29, and the outer surface of the lower end of the movable conductor 40 first detaches from the fixed contact 8, and then the lower end of the movable conductor 40. The inner surface of the part is separated from the arc contact 10, and an arc is generated between the movable conductor 40 and the arc contact 10. At this time, as the piston 32 moves upward, the inside of the puffer chamber 44 becomes negative with respect to the surrounding pressure, and the surrounding insulating gas flows from the lower end of the movable conductor 40 to the hollow portion and the through hole of the connecting member. 42, the conductor gas flows into the puffer chamber 44 through the conductor through hole 41, and a flow of the insulating gas is generated. The arc contacts the gas flow, and the arc is cooled and extinguished. Next, when a closing command is received, the operating shaft 26 rotates clockwise, and the movable plate 23 is
2 moves in the closing direction, that is, downward, along the insulated operating rod 2.
9. The movable conductor 40 moves down, the insulating gas in the puffer chamber 44 is compressed by the piston 32, and the pressure in the puffer chamber 44 increases.
At the same time as being blown out from the lower end of the movable conductor 40 to the outside through the connecting body through hole 42 and the hollow portion of the movable conductor 40, the check valve 36 is lifted up against the coil spring 39 and passes through the piston through hole 35. Is blown out to the outside. At this time, the pressure increase in the puffer chamber 44 causes a considerable load on the operating device for driving the disconnector, and an extra operating force is required. By releasing gas, the operating force of the operating device is reduced. Then, the movable conductor 40 further moves downward, and the inner surface of the lower end of the movable conductor 40 contacts the arc contact 10, and then the outer surface of the lower end of the movable conductor 40 contacts the fixed contact 8. , And the circuit is closed. In the case of the conventional disconnector, the coil spring 39 provided on each guide pin 34 is used for the return spring of the check valve 36, so that the piston 32
Requires a large space for providing each guide pin 34, the diameter of the piston 32 increases, the diameter D of the cylinder 19 shown in FIG. 5 also needs to increase, and the diameter D of the cylinder 19 increases. There is a problem that a large operation force is required for the operation device. An object of the present invention is to provide a disconnector which can reduce the diameter of a cylinder and reduce the operating force of an operating device, keeping the above points in mind. In order to solve the above-mentioned problems, a disconnector according to the present invention comprises an insulating operating rod movably provided on a cylinder, and a short columnar end provided at the end of the operating rod . A cylindrical coupling body fixed via a guide, a piston fixed to a base of the coupling body, and a cylinder provided on an outer periphery of the piston;
A piston ring that slides on the inner surface of the cylinder, a cylindrical movable conductor whose base is fixed to the distal end of the connecting body, and whose distal end comes into contact with the fixed contactor and the arc contact so as to be freely separated from each other; A movable contact block which is closed and through which a movable conductor penetrates; and a movable contact provided on the movable contact block and slidably contacting the movable conductor; a cylinder, a movable conductor, a piston and a movable contact. A puffer chamber formed by a base, a conductor through-hole formed at the base of the movable conductor and communicating with the puffer chamber, and a plurality of piston through-holes formed substantially on the same circumference as the piston and communicating with the puffer chamber. , on the opposite side of the puffer chamber of each piston hole, it covers each piston hole, the central
A guide is inserted into a through hole formed in the portion, and a disc-shaped check valve provided movably along the guide, and a check valve provided outside the guide in a direction to close the piston through-hole. And a biased conical coil spring. According to the disconnector of the present invention having the above-described structure, the spring for urging the check valve in a direction to close the piston through hole is provided.
Since a conical coil spring is used and the conical coil spring is provided on the guide at the end of the insulated operation rod, there is no need for a space for providing a guide pin on the conventional piston, and the diameter of the piston is reduced. The diameter of the cylinder is reduced, the operating force of the operating device is reduced, and the overall cost is reduced. An embodiment will be described with reference to FIGS. 1 to 3. FIG. 1 is a cutaway front view of a closed state, and FIG.
3B is a cut front view during the opening operation, B is a cut front view during the closing operation, FIG. 3A is a partially cut front view of FIG. 1, and B is FIG. 2B.
FIG. 4 is a partially cutaway front view of FIG. In these figures, the same reference numerals as those in FIGS. 4 to 7 denote the same or corresponding elements, and the differences are as follows. A plurality of piston through-holes 35 are formed at equal intervals on the same circumference of the piston 32, and the guide pin 34 is not provided on the piston 32 as in the prior art. The insertion hole 38 is not formed, and a conical coil spring 45 is provided outside the guide 31 instead of the cylindrical coil spring 39. Next, the operation will be described. First, FIG.
Is in a closed state, and the movable conductor 40 is in the downward movement position and contacts the fixed contact 8 and the arc contact 10 as in the case of the conventional FIG. 5, and as shown in FIG. 36 closes each piston through-hole 35 with a conical coil spring 45. Next, when an opening command is received, as in the prior art,
After the movable conductor 40 moves upward and separates from the fixed-side contact 8, separates from the arc contact 10, as shown in FIG. 2A, an arc is generated between the movable conductor 40 and the arc contact 10, As shown by the arrow in the figure, the insulating gas flows into the puffer chamber 44 through the hollow portion of the movable conductor 40, the connecting body through hole 42, and the conductor through hole 41, and the arc touches the insulating gas flow. It is cooled and extinguished. Next, when a closing command is received, as shown in FIG. 2B, the movable conductor 40 moves downward, and the insulating gas in the puffer chamber 44 is compressed by the piston 32, and the gas whose pressure has increased is removed as shown in FIG. As shown by the arrow in FIG. 3B, the air is blown to the outside through the conductor through-hole 41, the connecting body through-hole 42, and the hollow portion of the movable conductor 40, and at the same time, passes through the piston through-hole 35 to form the conical coil spring 45. The non-return valve 36 is lifted up and blows out to the outside, and the movable conductor 40 further moves down and contacts the arc contact 10, and then contacts the fixed contact 8, and the closed state shown in FIG. 1 is established. Therefore, a conical coil spring 45 is used as a spring for urging the check valve 36, and the conical coil spring 45 is provided outside the guide 31 at the end of the insulating operating rod 29. Therefore, the diameter d of the cylinder 19 is reduced, and the operating force of the operating device is reduced. Since the present invention is configured as described above, the following effects can be obtained. In the disconnector of the present invention, a conical coil spring 45 is used as a spring for urging the check valve 36 in a direction to close the piston through hole 35, and the conical coil spring 45 is insulated by an insulated operating rod. Since it is provided on the short cylindrical guide 31 at the end of the cylinder 29, there is no need for a space for providing a guide pin on the piston 32 as in the prior art, and the diameter of the piston 32 can be reduced and the diameter of the cylinder 19 can be reduced. Operating force can be reduced, and the overall cost can be reduced.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cut-away front view of a closed state according to an embodiment of the present invention. 2A is a cutaway front view during the opening operation of FIG. 1, and FIG. 2B is a cutout front view during the closing operation. 3A is a partially cutaway front view of FIG. 1, and FIG. 3B is a partially cutaway front view of FIG. 2B. FIG. 4 is an overall cut front view of a conventional example. FIG. 5 is a partially cutaway front view of FIG. 4; FIG. 6 is a partially cutaway front view of FIG. 5; FIG. 7 is a cut-away plan view of FIG. 6; [Description of Signs] 8 Fixed-side contact 10 Arc contact 15 Movable-side contact base 16 Movable-side contact 19 Cylinder 29 Insulating operation rod 30 Connected body 31 Guide 32 Piston 35 Piston through-hole 36 Check valve 40 Movable conductor 41 Conductor through hole 44 Puffer chamber 45 Coil spring

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H01H 33/70-33/99

Claims (1)

(57) [Claims] [Claim 1] An insulating operating rod movably provided on a cylinder, and is fixed to an end of the operating rod via a short columnar guide.
And a tubular coupling body, a piston fixed to the base of the connecting member, sliding on the inner surface of the cylinder is provided on the outer periphery of the piston
A piston ring in contact, the base portion is fixed to a distal end portion of the connecting body, closed and movable conductors tubular tip portion is separable freely brought into contact with the fixed side contacts and arcing contacts, the tip of the cylinder A movable contact penetrated by the movable conductor, a movable contact provided on the movable contact base and slidably contacting the movable conductor, the cylinder, the movable conductor, the piston, and the movable side. A puffer chamber formed by a contact base; a conductor through-hole formed at the base of the movable conductor and communicating with the puffer chamber; and a plurality of conductor holes formed substantially on the same circumference as the piston and communicating with the puffer chamber. A plurality of piston through-holes, and the respective piston through-holes, which are opposite to the puffer chambers, cover the respective piston through-holes, and the through-holes formed in the center portion have the above-mentioned piston through-holes.
A disc-shaped check valve through which a guide is inserted and movably provided along the guide; and a cone provided outside the guide and biasing the check valve in a direction to close the piston through hole. Disconnector provided with a coiled spring.