CN115547735A

CN115547735A - Novel air-blowing type isolating switch and using method thereof

Info

Publication number: CN115547735A
Application number: CN202211003576.4A
Authority: CN
Inventors: 曹少华; 蔡兴; 范芳超; 张思琼; 郝木新; 王成霄; 王树坤; 丛猛
Original assignee: Shandong Taikai High Volt Switchgear Co Ltd
Current assignee: Shandong Taikai High Volt Switchgear Co Ltd
Priority date: 2022-08-22
Filing date: 2022-08-22
Publication date: 2022-12-30

Abstract

The invention relates to a novel air-blowing type isolating switch and a using method thereof, wherein the novel air-blowing type isolating switch comprises a mechanism box, a tank body, a static contact and a fixed seat, wherein the static contact and the fixed seat are respectively positioned in the tank body, a moving contact insert and a static contact insert are connected on the tank body in an insulating manner, a tubular cylinder is axially connected in the fixed seat in a sliding manner, one end of the cylinder is matched with the static contact, the end part of the cylinder is provided with an air jet, the other end of the cylinder is fixedly connected with a connecting rod of the mechanism box through an insulating rod, a piston is arranged in the cylinder, the side surface of the cylinder is provided with a plurality of through holes, a supporting piece sleeved on the outer ring of the cylinder is fixedly connected on the fixed seat, the supporting piece penetrates through the through holes and is fixedly connected with the piston, and the piston is positioned between the through holes and the air jet.

Description

Novel air-blowing type isolating switch and using method thereof

Technical Field

The invention relates to the field of isolating switches, in particular to a novel air-blowing type isolating switch and a using method thereof.

Background

With the continuous development of the power system technology in China, the research and development strength of various large high-voltage electrical appliance manufacturing companies is continuously enhanced, the high-voltage switch structure is more reasonable, the performance is more reliable, china has enough strength to research and develop and produce ultrahigh-voltage and ultrahigh-voltage high-voltage electrical appliances, the requirement on high-voltage switch equipment with higher voltage levels is increased day by day, the capacity of a power transmission system is continuously expanded, and the voltage levels are gradually increased.

In order to effectively increase the power transmission capacity, the transmission current needs to be increased on the basis of high voltage class, and the rated current of the current design is increased to 8000A. According to the relevant standards of national standards and power departments, the bus conversion current is generally specified to be 80% of the rated current of the isolating switch. Along with the improvement of bus conversion current test parameters, the arc energy generated by the isolating switch in the switching-off process is increased, and the existing isolating switch structure cannot meet the test requirements, so that a novel isolating switch with arc extinguishing capability needs to be designed.

Disclosure of Invention

Aiming at the defects of the prior art, the invention provides a novel air-blowing type isolating switch and a using method thereof, which can realize bus conversion under the current condition of 8000A.

The invention is realized by the following technical scheme, and provides a novel air-blowing type isolating switch which comprises a mechanism box, a tank body, a static contact and a fixed seat, wherein the static contact and the fixed seat are both positioned in the tank body, a moving contact insert and a static contact insert are connected on the tank body in an insulating manner, the fixed seat is fixedly connected with the moving contact insert through a support, the static contact is fixedly connected with the static contact insert, a tubular cylinder is axially connected in the fixed seat in a sliding manner, one end of the cylinder is matched with the static contact, the end part of the cylinder is provided with an air jet, the other end of the cylinder is fixedly connected with a connecting rod of the mechanism box through an insulating rod, a piston is arranged in the cylinder, a plurality of through holes are formed in the side surface of the cylinder, a supporting piece sleeved on the outer ring of the cylinder is fixedly connected with the piston through the through holes, and the piston is positioned between the through holes and the air jet.

In the scheme, the mechanism box drives the connecting rod and the insulating part to move axially, so that the air cylinder is pushed to slide towards the direction of the static contact in the supporting part and the fixing seat, the air cylinder is connected with or separated from the static contact to realize switching-on or switching-off, the piston is fixed during switching-off, the closed space between the air cylinder and the piston is rapidly reduced, the pressure in the air cylinder is instantly increased, and SF gas in the air cylinder is sprayed out from the gas nozzle, so that electric arcs generated by switching-off between the air cylinder and the static contact are blown out, and the purpose of arc extinction is achieved.

And for optimization, the piston is provided with an air hole which penetrates through the piston in the axial direction, one end of the air hole, which is close to the air injection port, is provided with a valve plate for sealing the air hole, and the valve plate is in sliding connection with the piston in the axial direction. When the switch is switched on, the space in the cylinder between the piston and the air jet can be instantly increased, under the action of pressure difference, part of SF gas can push the valve plate open from the air hole on the piston and enter the space in the cylinder, so that the switch-on speed is increased, the air hole can be tightly pressed by the valve plate due to the pressure difference of two sides when the switch is switched off, and the SF gas in the cylinder can only be sprayed out from the air jet, so that electric arcs generated by switching off between the cylinder and a static contact are blown off, and the aim of arc extinction is fulfilled.

Preferably, the center of the piston is provided with a limit screw, and the valve plate is sleeved on the limit screw. The limit screw in the scheme realizes sliding connection and limitation of the valve block.

As optimization, the air holes are provided with a plurality of air holes which are uniformly distributed along the circumferential direction of the limit screws. The gas pocket in this scheme is provided with a plurality ofly and follows stop screw circumference equipartition to increase the air input.

Preferably, a moving arc contact is fixedly connected to one end, close to the fixed contact, of the cylinder, the end portion of the moving arc contact is a spherical surface, and the air nozzle is arranged on the moving arc contact. The moving arc contact in the scheme is used for bearing electric arcs.

Preferably, a static arc contact is axially and slidably connected to one end, close to the moving arc contact, of the static contact, a spring pushing the static arc contact towards the moving arc contact is installed in the static contact, and a static contact finger matched with the outer ring of the cylinder is installed on the static contact. According to the scheme, the moving arc contact is firstly contacted with the static arc contact during closing, and the moving arc contact is finally separated from the static arc contact during opening.

Preferably, an elastic contact finger is arranged between the fixed seat and the air cylinder. The elastic contact finger in the scheme is favorable for realizing uniform current flowing through the cylinder, reduces the skin effect on the surface of the cylinder and is more favorable for realizing the circulation of large current.

As the optimization, support piece's one end rigid coupling has a plurality of the passing the connection claw that passes the hole, a plurality of connection claw circumference equipartitions, connect the claw and pass through screw and piston rigid coupling, pass the hole and connect claw adaptation and extend along cylinder circumference. The connecting claw in the scheme is fixedly connected with the piston through the screw, so that the support piece penetrates through the hole and is fixedly connected with the piston, and the disassembly and the assembly are convenient.

Preferably, the supporting member is fixedly connected to one side of the fixed seat far away from the fixed contact through a bolt. Support piece passes through the bolt rigid coupling in this scheme and keeps away from one side of static contact at the fixing base to play the guide effect to the cylinder, improve the direction stroke of cylinder.

The use method of the air-blowing type isolating switch is characterized by comprising the following steps:

a. when the isolating switch is switched on, the connecting rod and the insulating part are driven to axially move through the mechanism box, so that the air cylinder is pushed to slide in the supporting part and the fixing seat towards the direction of the fixed contact, and the air cylinder is communicated with the fixed contact to realize switching on;

b. because the piston is fixedly connected with the supporting piece and does not slide along with the air cylinder, the space in the air cylinder between the piston and the air injection port can be instantly increased, so that the space pressure is reduced, pressure difference is formed inside and outside the air cylinder, flowing air flow is formed under the action of the pressure difference, part of SF gas can push open the valve plate from the air hole on the piston to enter the space in the air cylinder, and the other part of SF gas enters the space in the air cylinder through the air injection port;

c. when the isolating switch is opened, the connecting rod and the insulating part are driven to axially move through the mechanism box, so that the air cylinder is pushed to slide in the supporting part and the fixing seat in the opposite direction of the fixed contact, and the air cylinder is separated from the fixed contact to realize opening;

d. because the piston is fixed, the closed space between the cylinder and the piston is quickly reduced, the pressure in the cylinder is instantly increased, the valve plate can tightly press the air hole due to the pressure difference at two sides, and SF gas in the cylinder can only be sprayed out from the air spraying port, so that the electric arc generated between the cylinder and the static contact due to brake separation is blown out, and the purpose of arc extinction is achieved.

The invention has the beneficial effects that: according to the novel air-blowing type isolating switch and the using method thereof, the cylinder is used as a conductor, the structure is simple and compact, the manufacturing cost is saved, the safety and the reliability are realized, the performance is stable, the opening and the arc blowing of the isolating switch can be realized, the problem that the contact device is burnt out by electric arc generated by high current during bus conversion is solved, and the bus conversion can be realized under the current condition of 8000A.

Drawings

FIG. 1 is a schematic cross-sectional view of the present invention;

FIG. 2 is an enlarged view of a portion of the invention at M in FIG. 1;

FIG. 3 is a schematic view of the gas flow in the opening process of the present invention;

FIG. 4 is a schematic diagram of gas flow during a closing process of the present invention;

FIG. 5 is a schematic view of the connection of the support member and the piston of the present invention;

FIG. 6 is a schematic cross-sectional view of a cylinder of the present invention;

fig. 7 is a schematic cross-sectional view of a static contact according to the present invention;

shown in the figure:

1. the device comprises a connecting rod, 2, an insulating rod, 3, a supporting piece, 4, a piston, 5, a cylinder, 6, a moving arc contact, 7, an air jet, 8, a static arc contact, 9, an insulating basin, 10, a static contact insert, 11, a tank body, 12, a guide groove, 13, a screw, 14, a support, 15, an elastic contact finger, 16, a fixed seat, 17, a shielding cover, 18, a static contact, 19, a mechanism box, 20, a valve plate, 21, an air hole, 22, an O-shaped ring, 23, a limiting screw, 24, a moving contact insert, 25 and a connecting claw.

Detailed Description

In order to clearly illustrate the technical features of the present solution, the present solution is explained below by way of specific embodiments.

As shown in fig. 1 to 7, the novel air-blowing type disconnecting switch of the invention includes a mechanism box 19, a tank 11, a static contact 18 and a fixing seat 16 which are all located in the tank 11, wherein the tank 11 is arranged in a sealed manner, and SF6 gas is filled in the tank to play a role in insulating and arc extinguishing.

The movable contact insert 24 and the static contact insert 10 are connected to the tank body 11 in an insulating manner, and the movable contact insert 24 and the static contact insert 10 are connected to the tank body 11 through the insulating basin 9 respectively, so that the insulating connection with the tank body 11 is realized.

The fixed seat 16 is fixedly connected with the movable contact insert 24 through the support 14, so that the conductive fixed connection of the fixed seat 16 and the movable contact insert 24 is realized. The static contact 18 is fixedly connected with the static contact insert 10, so that the static contact 18 is fixedly connected with the static contact insert 10 in an electric conduction manner.

The fixing seat 16 is internally provided with a circular hole, the fixing seat 16 is internally axially connected with the tubular cylinder 5 in a sliding manner, and the elastic contact finger 15 is arranged between the fixing seat 16 and the cylinder 5, so that the current passing through the cylinder can uniformly flow through the elastic contact finger, the skin effect on the surface of the cylinder is reduced, and the circulation of large current is more facilitated.

The axis of the cylinder 5 is coaxial with the static contact 18, one end of the cylinder 5 is matched with the static contact 18, and the end of the cylinder 5 is provided with an air nozzle 7, in the embodiment, one end of the cylinder 5, which is close to the static contact 18, is fixedly connected with a moving arc contact 6, the end of the moving arc contact 6 is a spherical surface, the air nozzle 7 is arranged on the moving arc contact 6, and the diameter of the air nozzle 7 is 0.05 to 0.2 times of that of the cylinder 5, so that rapid air blowing and arc extinguishing are realized through the small holes.

The other end of the cylinder 5 is fixedly connected with the connecting rod 1 of the mechanism box 19 through the insulating rod 2, so that the connecting rod 1 of the mechanism box 19 drives the cylinder 5 to axially move, and meanwhile, the mechanism box side is effectively insulated from the isolating switch.

The piston 4 is installed in the cylinder 5, a plurality of through holes are formed in the side face of the cylinder 5, the supporting piece 3 sleeved on the outer ring of the cylinder 5 is fixedly connected to the fixing seat 16, and the supporting piece 3 is fixedly connected to one side, far away from the fixed contact 18, of the fixing seat 16 through bolts. A guide groove 12 is formed in the support piece 3, and an O-shaped ring is arranged in the guide groove 12 and plays a role in sealing and guiding. Because the supporting piece 3 is fixedly arranged, the supporting piece 3 plays a role in supporting and guiding when the air cylinder 5 moves axially, and the guiding stroke of the air cylinder is improved.

The support 3 is fixedly connected with the piston 4 through the through hole, and the piston 4 is positioned between the through hole and the air outlet 7, so that the piston is fixed.

In this embodiment the one end rigid coupling of support piece 3 has a plurality of passes connect the claw 25, a plurality of 25 circumference equipartitions of connecting the claw, connect claw 25 and pass through screw 13 and piston 4 rigid coupling, pass the hole and connect claw 25 adaptation and extend along cylinder 5 circumference, thereby realized that support piece passes pass hole and piston rigid coupling, and the dismouting of just being convenient for.

One end of the static contact 18 close to the moving arc contact 6 is axially connected with the static arc contact 8 in a sliding manner, a spring which pushes the static arc contact 8 towards the moving arc contact 6 is installed in the static contact 18, a static contact finger which is matched with the outer ring of the air cylinder 5 is installed on the static contact 18, the moving arc contact is firstly contacted with the static arc contact when the switch is switched on, and the moving arc contact is finally separated from the static arc contact when the switch is switched off.

As shown in fig. 2, the piston 4 is provided with an air hole 21 penetrating axially, one end of the air hole 21 close to the air injection port 7 is provided with a valve plate 20 for sealing the air hole 21, the valve plate 20 is in sliding connection with the piston 4 axially, in this embodiment, the center of the piston 4 is provided with a limit screw 23, the limit screw realizes sliding connection and limiting of the valve plate, and the valve plate 20 is sleeved on the limit screw 23 and can axially move on the limit screw 23.

The air holes 21 are uniformly distributed along the circumferential direction of the limit screws 23 and are tightly pressed on the piston 4 through the valve plate 20, so that the sealing of all the air holes 21 can be realized.

And the outer sides of the static contacts 18 and the movable contact assemblies are respectively provided with a shielding cover 17, and each movable contact assembly comprises a support 3, a piston 4 and a fixed seat 16.

a. when the isolating switch is switched on, the mechanism box 19 drives the connecting rod 1 and the insulating part 2 to axially move, so that the air cylinder 5 is pushed to slide towards the direction of the static contact 18 in the supporting part 3 and the fixed seat 16, and the air cylinder 5 is communicated with the static contact 18 to realize switching on;

b. because the piston 4 is fixedly connected with the support 3 and does not slide along with the cylinder 5, the space in the cylinder between the piston 4 and the air injection port 7 can be instantly increased, so that the space pressure is reduced, a pressure difference is formed between the inside and the outside of the cylinder, flowing air flow is formed under the action of the pressure difference, part of SF6 gas can push the valve plate 20 open from the air hole 21 on the piston 4 and enters the space in the cylinder, and the other part of SF6 gas enters the space in the cylinder through the air injection port 7;

c. when the isolating switch is switched off, the mechanism box 19 drives the connecting rod 1 and the insulating part 2 to axially move, so that the air cylinder 5 is pushed to slide in the supporting part 3 and the fixed seat 16 in the opposite direction of the fixed contact 18, and the air cylinder 5 is separated from the fixed contact 18 to realize switching off;

d. because the piston 4 is fixed, the closed space between the cylinder 5 and the piston 4 is rapidly reduced, the pressure intensity in the cylinder is instantly increased, the valve plate 20 can press the air hole 21 due to the pressure intensity difference at the two sides, and the SF6 gas in the cylinder can only be sprayed out from the gas spraying opening 7, so that the electric arc generated between the cylinder 5 and the static contact 18 due to the brake separation is blown out, and the purpose of arc extinction is achieved.

Of course, the above description is not limited to the above examples, and the undescribed technical features of the present invention can be implemented by or using the prior art, and will not be described herein again; while the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes, modifications, additions and substitutions may be made without departing from the spirit of the invention and the scope of the invention as defined in the accompanying claims.

Claims

1. The utility model provides a novel air-blast formula isolator which characterized in that: the novel energy-saving type gas cylinder comprises a mechanism box (19), a tank body (11), a fixed contact (18) and a fixed seat (16), wherein the fixed contact (18) and the fixed seat (16) are located in the tank body (11), a movable contact insert (24) and a fixed contact insert (10) are connected to the tank body (11) in an insulating mode, the fixed seat (16) is fixedly connected with the movable contact insert (24) through a support (14), the fixed contact (18) is fixedly connected with the fixed contact insert (10), a tubular cylinder (5) is axially and slidably connected into the fixed seat (16), one end of the cylinder (5) is matched with the fixed contact (18) and the end of the fixed contact insert, a gas jet (7) is formed in the fixed seat (16), the other end of the cylinder (5) is fixedly connected with a connecting rod (1) of the mechanism box (19) through an insulating rod (2), a piston (4) is arranged in the cylinder (5), a plurality of through holes are formed in the side face of the cylinder (5), a support piece (3) sleeved on the outer ring of the cylinder (5) is fixedly connected with the support piece (3), and the support piece (3) penetrates through the holes and the piston (4) is located between the fixed contact and the gas jet (7).

2. The novel air-blowing type isolating switch as claimed in claim 1, wherein: an air hole (21) which penetrates axially is formed in the piston (4), a valve plate (20) for sealing the air hole (21) is installed at one end, close to the air injection port (7), of the air hole (21), and the valve plate (20) is in axial sliding connection with the piston (4).

3. The novel air-blowing type isolating switch as claimed in claim 2, wherein: and a limit screw (23) is arranged in the center of the piston (4), and the valve plate (20) is sleeved on the limit screw (23).

4. The novel air-blowing type isolating switch as claimed in claim 2, wherein: the air holes (21) are formed in a plurality of positions and are circumferentially and uniformly distributed along the limit screws (23).

5. The novel air-blowing type isolating switch as claimed in claim 1, wherein: one end of the cylinder (5) close to the static contact (18) is fixedly connected with a moving arc contact (6), the end part of the moving arc contact (6) is a spherical surface, and the air jet opening (7) is arranged on the moving arc contact (6).

6. The novel air-blowing type isolating switch as claimed in claim 5, wherein: one end of the static contact (18) close to the moving arc contact (6) is axially connected with the static arc contact (8) in a sliding mode, a spring for pushing the static arc contact (8) to the moving arc contact (6) is installed in the static contact (18), and a static contact finger matched with the outer ring of the air cylinder (5) is installed on the static contact (18).

7. The novel air-blowing type isolating switch as claimed in claim 1, wherein: an elastic contact finger (15) is arranged between the fixed seat (16) and the cylinder (5).

8. The novel air-blowing type isolating switch as claimed in claim 1, wherein: the one end rigid coupling of support piece (3) has a plurality ofly to pass connect claw (25) that pass the hole, a plurality ofly connect claw (25) circumference equipartition, connect claw (25) through screw (13) and piston (4) rigid coupling, pass the hole and connect claw (25) adaptation and extend along cylinder (5) circumference.

9. The novel air-blowing type isolating switch as claimed in claim 1, wherein: the supporting piece (3) is fixedly connected to one side, far away from the static contact (18), of the fixed seat (16) through a bolt.

10. A method of using the air-blown disconnector of claim 2, characterized by the steps of:

a. when the isolating switch is switched on, the connecting rod and the insulating part are driven to axially move through the mechanism box, so that the air cylinder is pushed to slide towards the direction of the fixed contact in the supporting part and the fixed seat, and the air cylinder is communicated with the fixed contact to realize the switching on;

b. because the piston is fixedly connected with the supporting piece and does not slide along with the air cylinder, the space in the air cylinder between the piston and the air injection port can be instantly increased, so that the space pressure is reduced, a pressure difference is formed inside and outside the air cylinder, flowing air flow is formed under the action of the pressure difference, part of SF gas can prop open the valve plate from the air hole in the piston and enters the space in the air cylinder, and the other part of SF gas enters the space in the air cylinder through the air injection port;

c. when the isolating switch is switched off, the connecting rod and the insulating part are driven to axially move through the mechanism box, so that the air cylinder is pushed to slide in the supporting part and the fixed seat in the opposite direction of the fixed contact, and the air cylinder is separated from the fixed contact to realize switching off;