Static contact structure for isolating switch

Abstract

The utility model belongs to the technical field of disconnecting switches, and discloses a static contact structure for a disconnecting switch, which comprises a through-flow conductor, a notch for a moving contact to enter and exit is arranged on the through-flow conductor, a plurality of first annular watchband contact fingers matched with the moving contact are arranged on the inner wall of the notch, and a plurality of second annular watchband contact fingers matched with the moving contact are arranged on the inner wall of the notch. A static arc contact and an elastic telescopic mechanism are arranged at the axial position of the notch, the static arc contact and the elastic telescopic mechanism are in threaded connection, the elastic telescopic mechanism penetrates through the bottom of the notch and adopts a pressing needle type nested structure, a spring is arranged in the elastic telescopic mechanism, and the elastic telescopic mechanism is used for converting rigid contact of closing into flexible contact and providing initial auxiliary force for opening; a torque applying auxiliary part is further arranged in the elastic telescopic mechanism and used for promoting fastening connection of the static arc contact and the elastic telescopic mechanism.

Description

Technical Field

[0001] The invention relates to the technical field of isolating switches, and in particular to a static contact structure for isolating switches. Background Art

[0002] With the continuous advancement of high voltage technology, higher requirements are placed on the opening and closing current capacity of disconnecting switch equipment. Usually, the movable and static contacts of disconnecting switches adopt a plug-in structure, and the opening and closing operations are rigid contacts. They are prone to wear and chipping after many times, which leads to high maintenance costs and also brings safety hazards to the operation of primary and secondary equipment in substations. Summary of the invention

[0003] The invention provides a static contact structure for an isolating switch, which solves the technical problems of the existing contact structure being easy to wear and chip off and having high maintenance cost.

[0004] The present invention can be achieved through the following technical solutions:

[0005] A static contact structure for a disconnector, comprising a current-carrying conductor, a notch for a moving contact to enter and exit is arranged on the current-carrying conductor, a plurality of first annular band contact fingers cooperating with the moving contact are arranged on the inner wall of the notch, a static arc contact and an elastic telescopic mechanism are arranged at the axial position thereof, the two are threadedly connected, the elastic telescopic mechanism passes through the bottom of the notch, and adopts a needle-pressing nesting structure, a spring is arranged inside, and is used to convert the rigid contact of closing the switch into a flexible contact, and provide a starting auxiliary force for opening the switch;

[0006] A torque application auxiliary component is also arranged inside the elastic telescopic mechanism to promote the tight connection between the static arc contact and the elastic telescopic mechanism.

[0007] Further, the elastic telescopic mechanism comprises an inner sleeve and an outer sleeve which are nested and matched, and the two are in rolling contact. A spring is arranged inside the inner sleeve along the axial direction, one end of the spring abuts against the free end of the inner sleeve, and the other end abuts against the free end of the outer sleeve. The free end of the inner sleeve is also connected to the static arc contact. The free end of the outer sleeve is provided with a guide rod, and the guide rod is inserted into the interior of the spring.

[0008] When the switch is closed, driven by the operating mechanism, the moving contact contacts the static arc contact and pushes the static arc contact to move toward the bottom of the notch, driving the inner sleeve to move toward the free end of the outer sleeve, causing the spring to be compressed along the guide rod to convert the rigid contact between the moving contact and the static arc contact into a flexible contact;

[0009] When opening the switch, the moving contact and the static arc contact are disengaged under the drive of the operating mechanism, and the reaction force provided by the compressed spring serves as an auxiliary thrust to promote the rapid separation of the moving contact and the static arc contact.

[0010] Furthermore, a linear bearing, a second annular band contact finger and a guide sleeve and step surfaces that cooperate with each other are arranged at the contact position between the inner sleeve and the outer sleeve, the linear bearing is arranged on one side of the step surface, close to the non-free end of the outer sleeve, and the second annular band contact finger and the guide sleeve are arranged on the other side of the step surface, close to the non-free end of the inner sleeve.

[0011] Furthermore, protruding steps are alternately arranged on the outer side of the non-free end of the inner sleeve and on the inner side of the non-free end of the outer sleeve, and notches that cooperate with the second annular strap contact finger and the guide sleeve are arranged on the surface of the steps of the inner sleeve, and notches that cooperate with a retaining ring are arranged on the surface of the steps of the outer sleeve, and the retaining ring is used to limit the moving position of the linear bearing.

[0012] Furthermore, a joint that cooperates with the inner sleeve thread is provided at the center position of the static arc contact, and a through channel is provided, and a torque application auxiliary part is provided inside the inner sleeve near the joint. The torque application auxiliary part cooperates with the auxiliary rod passing through the through channel to realize the rotational fixation of the inner sleeve, so as to apply torque to the static arc contact and ensure that the static arc contact is firmly connected to the inner sleeve.

[0013] Furthermore, tungsten-copper material is sintered on the surface of the static arc contact facing the moving contact.

[0014] Furthermore, the current-carrying conductor is in a T-shaped structure as a whole, a notch is provided on its transverse portion, a channel matching with the outer tube is provided on its vertical portion, and a plurality of heat dissipation through holes are provided at the bottom of the notch.

[0015] The beneficial technical effects of the present invention are:

[0016] 1. By adding an elastic telescopic mechanism on the static contact side, the rigid contact between the moving contact and the static arc contact is changed into a flexible contact, which reduces the impact force when the two are matched, reduces wear and reduces the possibility of chip drop. At the same time, the energy storage of the compression spring is used as the auxiliary force for opening the gate, which in turn promotes the rapid opening of the moving contact and the static arc contact, thereby improving the service life and safety of the entire device.

[0017] In addition, the space on the stationary contact side is larger than that on the moving contact side, which can provide more space for the placement of the elastic telescopic mechanism and is easier to implement.

[0018] 2. The linear bearing is cleverly designed to convert the sliding contact between the inner sleeve and the outer sleeve into rolling contact, reducing the friction between the two, making it less likely to get stuck and ensuring smooth operation. At the same time, the addition of a strap contact finger helps to improve the flowability during opening and closing.

[0019] 3. Since the static arc contact and the inner sleeve are threadedly connected, the inner sleeve and the outer sleeve can rotate relative to each other. In order to facilitate installation, a torque application auxiliary part is added to the inner sleeve, and a channel is opened on the static arc contact. With the help of the locking rod and the torque application auxiliary part, the inner sleeve can be fixed, and the torque can be applied conveniently, thereby completing the fastening connection between the static arc contact and the elastic telescopic mechanism, providing a guarantee for the safety of the entire device and helping to improve the service life of the entire device. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 It is a partial structure enlarged schematic diagram of the present invention;

[0022] Figure 3 It is a schematic structural diagram of the coordination between the static arc contact and the current-carrying conductor of the present invention;

[0023] Figure 4 It is a schematic diagram of the structure of the torque applying auxiliary member and the locking stem matching of the present invention;

[0024] Among them, 1-current-carrying conductor, 101-heat dissipation through hole, 2-moving contact, 3-first annular band contact finger, 4-arc dispersion contact, 5-elastic telescopic mechanism, 501-inner sleeve, 502-outer sleeve, 503-spring, 504-guide rod, 505-linear bearing, 506-second annular band contact finger, 507-guide sleeve, 508-retaining ring, 6-torque application auxiliary part, 7-locking rod. DETAILED DESCRIPTION

[0025] The specific implementation of the present invention is described in detail below with reference to the accompanying drawings and preferred embodiments.

[0026] like Figure 1As shown, the present invention provides a static contact structure for a disconnector, including a current-carrying conductor 1, a recess for a moving contact 2 to enter and exit is arranged on the current-carrying conductor 1, a plurality of first annular band contact fingers 3 cooperating with the moving contact 2 are arranged on the inner wall of the recess, a static arc contact 4 and an elastic telescopic mechanism 5 are arranged at the axial position thereof, the two are threadedly connected, the elastic telescopic mechanism 5 passes through the bottom of the recess, and adopts a needle-pressing nested structure, a spring is arranged inside, which is used to convert the rigid contact of closing the switch into a flexible contact and provide a starting assist for opening the switch; a torque applying auxiliary part 6 is also arranged inside the elastic telescopic mechanism 5, which is used to promote the fastening connection between the static arc contact 4 and the elastic telescopic mechanism 5. In this way, by adding an elastic expansion mechanism on the static contact side, the rigid contact between the moving contact and the static arc contact when closing the circuit breaker is changed into a flexible contact, thereby reducing the impact force when the two are coordinated, reducing wear and reducing the possibility of chip falling. At the same time, the energy storage of the compression spring is used as the starting auxiliary force for opening the circuit breaker, which helps to promote the rapid opening of the moving contact and the static arc contact. In addition, with the help of a torque application auxiliary part, the fastening connection between the static arc contact and the elastic expansion mechanism can be completed, which provides a guarantee for the safety of the entire device and helps to improve the service life of the entire device.

[0027] The details are as follows:

[0028] The elastic telescopic mechanism 5 comprises an inner sleeve 501 and an outer sleeve 502 which are nested and in rolling contact with each other. A spring 503 is arranged inside the inner sleeve 501 along the axial direction. One end of the spring 503 abuts against the free end of the inner sleeve 501, and the other end abuts against the free end of the outer sleeve 502. The free end of the inner sleeve 501 is also connected to the static arc contact 4. The free end of the outer sleeve 502 is provided with a guide rod 504, and the guide rod 504 is inserted into the spring 503.

[0029] In order to achieve rolling contact, a linear bearing 505, a second annular band contact finger 506, a guide sleeve 507 and step surfaces that cooperate with each other are arranged at the contact position between the inner sleeve 501 and the outer sleeve 502. We can staggeredly arrange protruding steps on the outside of the non-free end of the inner sleeve 501 and the inside of the non-free end of the outer sleeve 502. With the help of the staggered step surfaces, the moving position of the inner sleeve 501 inside the outer sleeve 502 is limited. At the same time, the linear bearing 505 is arranged on one side of the step surface, close to the non-free end of the outer sleeve 502; the second annular band contact finger 506 and the guide sleeve 507 are arranged on the other side of the step surface, close to the non-free end of the inner sleeve 501;

[0030] A notch is provided on the surface of the step of the inner sleeve 501 to match the second annular watchband contact finger 506 and the guide sleeve 507, and the depth of the notch is determined so that the installed second watchband contact finger 506 and the guide sleeve 507 can contact the inner wall of the outer sleeve 502. A notch is provided on the surface of the step of the outer sleeve 502 to match the retaining ring 508, and the retaining ring 508 is provided near the end of the outer sleeve 502 to limit the movement position of the linear bearing 505 and prevent the linear bearing 505 from detaching;

[0031] In this way, when the switch is closed, driven by the operating mechanism, the moving contact 2 moves toward the direction close to the static arc contact 4, and the two first contact and then continue to push the static arc contact 4 to move toward the bottom of the notch, at which time the inner sleeve 501 is driven to move toward the free end of the outer sleeve 502, causing the spring 503 to be compressed along the guide rod, thereby converting the rigid contact between the moving contact 2 and the static arc contact 4 into a flexible contact, reducing the impact force of the contact between the two;

[0032] When opening the circuit breaker, driven by the operating mechanism, the moving contact 2 moves away from the static arc contact 4 until it loses contact with the static arc contact 4. During this process, the reaction force provided by the compressed spring 503 acts as an auxiliary thrust to promote the rapid separation of the moving contact 2 and the static arc contact 4.

[0033] We set a joint that cooperates with the thread of the inner sleeve 501 at the center position of the static arc contact 4 to facilitate threaded contact. At the same time, a through channel is opened at its center position. A torque application auxiliary part 6 such as a hexagon socket bolt is set inside the inner sleeve 501 near the joint. The torque application auxiliary part 6 cooperates with the locking rod 7 passing through the through channel to realize the rotational fixation of the inner sleeve 501. The locking rod 7 can be held by hand to keep it motionless. In this way, when the inner sleeve 501 is fixed, the static arc contact 4 can be screwed onto the inner sleeve 501, and a set torque can be applied to the static arc contact 4 with the help of a torque wrench to ensure that the static arc contact 4 is firmly connected to the inner sleeve 501.

[0034] The static arc contact 4 adopts a disc-type structure as a whole, which can play an arc-starting role when the disconnector opens and closes the busbar to switch the current test. It has edges around it for easy rotation and installation. At the same time, tungsten-copper material is sintered on its surface facing the moving contact to improve its ablation resistance.

[0035] In addition, the current-carrying conductor 1 is in a T-shaped structure as a whole, with a notch on its transverse part and a channel matching the outer tube on its vertical part. A plurality of heat dissipation holes 101 are provided at the bottom of the notch to facilitate heat dissipation during opening and closing operations.

[0036] Although specific embodiments of the present invention are described above, those skilled in the art should understand that these are merely examples and that various changes or modifications may be made to these embodiments without departing from the principles and essence of the present invention. Therefore, the scope of protection of the present invention is limited by the appended claims.

Claims

1. A static contact structure for an isolating switch, characterized in that: It comprises a current-carrying conductor, on which a notch for a moving contact to enter and exit is arranged, on the inner wall of the notch are arranged a plurality of first annular band contact fingers cooperating with the moving contact, and at its axial position are arranged a static arc contact and an elastic telescopic mechanism, which are threadedly connected, and the elastic telescopic mechanism passes through the bottom of the notch and adopts a needle-pressing nesting structure, with a spring arranged inside, which is used to convert the rigid contact of closing into flexible contact and provide a starting auxiliary force for opening; A torque application auxiliary component is also provided inside the elastic telescopic mechanism to promote the tight connection between the static arc contact and the elastic telescopic mechanism.

2. The static contact structure for the isolating switch according to claim 1, characterized in that: The elastic telescopic mechanism includes a nested inner sleeve and an outer sleeve, which are in rolling contact. A spring is arranged inside the inner sleeve along the axial direction. One end of the spring abuts against the free end of the inner sleeve, and the other end abuts against the free end of the outer sleeve. The free end of the inner sleeve is also connected to the static arc contact. The free end of the outer sleeve is provided with a guide rod, and the guide rod is inserted into the interior of the spring.

3. The static contact structure for the isolating switch according to claim 2, characterized in that: A linear bearing, a second annular band contact finger and a guide sleeve and step surfaces that cooperate with each other are arranged at the contact portion between the inner sleeve and the outer sleeve. The linear bearing is arranged on one side of the step surface, close to the non-free end of the outer sleeve, and the second annular band contact finger and the guide sleeve are arranged on the other side of the step surface, close to the non-free end of the inner sleeve.

4. The static contact structure for the isolating switch according to claim 3 is characterized in that: Protruding steps are alternately arranged on the outer side of the non-free end of the inner sleeve and on the inner side of the non-free end of the outer sleeve, and notches that cooperate with the second annular strap contact finger and the guide sleeve are arranged on the surface of the steps of the inner sleeve, and notches that cooperate with a retaining ring are arranged on the surface of the steps of the outer sleeve, and the retaining ring is used to limit the moving position of the linear bearing.

5. The static contact structure for the isolating switch according to claim 2, characterized in that: A joint that cooperates with the inner sleeve thread is arranged at the center position of the static arc contact, and a through channel is arranged. A torque application auxiliary part is arranged inside the inner sleeve near the joint. The torque application auxiliary part cooperates with the auxiliary rod passing through the through channel to realize the rotational fixation of the inner sleeve, so as to apply torque to the static arc contact and ensure that the static arc contact is firmly connected to the inner sleeve.

6. The static contact structure for the isolating switch according to claim 5, characterized in that: Tungsten copper material is sintered on the surface of the static arc contact facing the moving contact.

7. The static contact structure for the isolating switch according to claim 1, characterized in that: The current-carrying conductor is in a T-shaped structure as a whole, a notch is arranged on its transverse part, a channel matched with the outer tube is arranged on its vertical part, and a plurality of heat dissipation through holes are arranged at the bottom of the notch.

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