CN110853976B

CN110853976B - Vacuum load switch

Info

Publication number: CN110853976B
Application number: CN201911149375.3A
Authority: CN
Inventors: 周鹤铭
Original assignee: Zhejiang Ziguang Electric Appliance Co ltd
Current assignee: Zhejiang Ziguang Electric Appliance Co ltd
Priority date: 2019-11-21
Filing date: 2019-11-21
Publication date: 2022-01-21
Anticipated expiration: 2039-11-21
Also published as: CN110853976A

Abstract

The invention provides a vacuum load switch, and belongs to the technical field of high-voltage switches. The technical problems that an existing vacuum load switch is poor in operation stability and the like are solved. This vacuum load switch includes the base, lead electrical pillar, a housing, vacuum interrupter, quiet feeler lever, movable contact lever and reset spring, it is connected through delay switch to lead electrical pillar upper end and casing upper end, the lower extreme of casing is articulated with the base, link firmly the cam that has convex curved surface and concave curved surface on the base, when movable contact lever lower extreme supports and leans on convex curved surface, movable contact lever and quiet feeler lever contact and delay switch intercommunication, when the casing leads electrical pillar external pendulum to the primary importance relatively movable contact lever lower extreme supports and leans on concave curved surface, movable contact lever and quiet feeler lever separation and delay switch keep the on-state, when casing leads electrical pillar to continue external pendulum to the secondary importance relatively, movable contact lever and quiet feeler lever keep the off-state and delay switch disconnection. The vacuum load switch is simple and reasonable in structure, and the operation stability of the vacuum load switch is improved.

Description

Vacuum load switch

Technical Field

The invention belongs to the technical field of high-voltage switches, and particularly relates to a vacuum load switch.

Background

The vacuum load switch is an electric appliance with a function between a high-voltage circuit breaker and a high-voltage isolating switch, can switch on and off certain load current and overload current, and is widely applied to the field of high-voltage power transmission and distribution. The vacuum load switch generally comprises a cylindrical shell internally provided with a vacuum arc extinguish chamber, a static contact rod with the lower end inserted in the vacuum arc extinguish chamber, a movable contact rod with the upper end inserted in the vacuum arc extinguish chamber and capable of moving up and down along the vacuum arc extinguish chamber, and a switching device used for controlling the movable contact rod of the vacuum arc extinguish chamber to be contacted with the static contact rod.

For example, a vacuum load switch is disclosed in chinese patent application No. 03280041.X, which comprises a main body provided with a vacuum arc-extinguishing chamber, wherein an opening and closing device of the vacuum load switch comprises a four-bar linkage mechanism, a cam for driving the four-bar linkage mechanism, and an energy storage mechanism connected to the cam, one end of the four-bar linkage mechanism is in contact with a breaking half shaft of the main body, the other end of the four-bar linkage mechanism is connected to an insulator, an upper end of the insulator is provided with a conductive rod, the conductive rod is connected to a moving contact in the vacuum arc-extinguishing chamber, an opening and closing spring is provided between the vacuum arc-extinguishing chamber and the conductive plate, the energy storage mechanism is connected to the cam through an energy storage shaft, the energy storage spring comprises an energy storage spring, one end of the energy storage spring is connected to an energy storage connecting lever, and the energy storage connecting lever is fixed to the energy storage shaft. However, this solution has the following drawbacks: when closing a floodgate circular telegram, the connecting lever among four-bar linkage and the energy storage mechanism all can receive lasting pressure, takes place micro-deformation easily, and articulated point department at connecting lever both ends very much appears wearing and tearing and not hard up after the multiple operation easily, influences the control accuracy and the stability of the floodgate operation that opens and shuts, and this floodgate device that opens and shuts structure is complicated simultaneously, and the installation is troublesome, is unfavorable for reduction in production cost.

Disclosure of Invention

The invention provides a vacuum load switch aiming at the problems in the prior art, and the technical problems to be solved by the invention are as follows: how to improve the operation stability of the vacuum load switch.

The purpose of the invention can be realized by the following technical scheme:

a vacuum load switch comprises a base, wherein the base is provided with a conductive column and a shell which are oppositely arranged at intervals, the shell is internally provided with a vacuum arc extinguish chamber which comprises a static contact rod, a movable contact rod and a return spring which can enable the movable contact rod to always keep away from the static contact rod, it is characterized in that the upper end of the conductive column is connected with the upper end of the shell through a time delay switch, the lower end of the shell is hinged with a base, a cam with a convex curved surface and a concave curved surface is fixedly connected with the base, when the lower end of the movable contact rod is abutted against the convex curved surface, the movable contact rod is contacted with the static contact rod and the time delay switch is communicated, when the shell swings outwards relative to the conductive column to a first position, the lower end of the movable contact rod is abutted against the concave curved surface, the movable contact rod is separated from the static contact rod, and the time delay switch keeps a communicated state, when the shell body continuously swings outwards to the second position relative to the conductive column, the movable contact rod and the fixed contact rod are kept in a separated state, and the delay switch is disconnected.

The working principle of this patent does: when the lower end of the movable contact rod is abutted against the convex curved surface, the movable contact rod is abutted against the static contact rod to enable the movable contact rod to be contacted with the static contact rod, the reset spring is pressed to store energy, the delay switch is communicated, and current flowing in from the conductive post can sequentially flow through the delay switch, the static contact rod, the movable contact rod and the cam; when the shell is pushed to swing to the first position, the lower end of the movable contact rod can roll to the concave curved surface along the convex curved surface, the reset spring resets and releases energy to push the cam to move downwards and abut against the concave curved surface, the movable contact rod moves downwards and is separated from the static contact rod, and the time delay switch is still in a connection state and has no current passing; when the shell is pushed to swing to the second position, the lower end of the movable contact rod rolls along the concave curved surface, the movable contact rod is separated from the static contact rod, and the delay switch is switched off; otherwise, when the shell is pushed to enable the shell to swing back relative to the conductive column, the time delay switch is firstly switched on, and then the movable contact rod is contacted with the static contact rod. Therefore, arc sparks can be prevented from being generated at the positions of the delay switch, the movable contact rod and the fixed contact rod during the switching-on and switching-off operations of the vacuum load switch, and the control precision and the operation stability of the vacuum load switch can be improved. Compared with the switching device comprising the four-bar mechanism and the energy storage mechanism in the prior art, the switching device has the advantages that the structural design is simple and reasonable, the installation and the operation are convenient, the production cost is reduced, the transmission of the connecting lever is avoided, the problem that the connecting lever is easy to loosen or wear at the connecting lever hinging point after multiple switching-on and switching-off operations can be avoided, and the control precision and the operation stability of the vacuum load switch are improved.

In the vacuum load switch described above, the cam is located in the housing. The space utilization in the shell is favorably improved, and compared with the structure that the cam is arranged outside the shell in the prior art, the working safety of the cam can be improved, and the operation stability of the vacuum load switch is guaranteed.

In the vacuum load switch, the lower end of the shell is hinged to the cam through the first rotating shaft. The shell is hinged to the base through the rotating shaft I and the cam, the structural design is simple and reasonable, the structure is compact, the shell is convenient to push to swing, and the operation stability of the vacuum load switch is guaranteed.

In the vacuum load switch, when the delay switch is closed, the lower end of the movable contact rod abuts against the cam through the cam abutting piece. Preferably, the cam abutting piece is fixedly connected with the movable contact rod through a bolt, so that the cam abutting piece is convenient to mount, dismount and overhaul.

In foretell vacuum load switch, the cam supports to lean on the piece and includes the roof that links firmly with the movable contact rod lower extreme, be equipped with two limiting plates that relative interval set up on the roof, the cam is located between two limiting plates, the cam supports to lean on the piece and still includes to pass two limiting plates and supports and lean on pivot two on the cam. The first limiting plate can limit the first rotating shaft, so that the first rotating shaft is prevented from shifting when rolling along the cam, the cam is enabled to abut against the piece to roll along the cam, and the operation stability of the vacuum load switch is improved.

In foretell vacuum load switch, delay switch is including setting up in leading the elasticity clamping piece of electrical pillar upper end and setting up in the push rod of casing upper end, the one end of push rod is used for with elasticity clamping piece joint, the other end and the casing of push rod are articulated. When the shell swings outwards, the push rod rotates relative to the shell, so that the push rod can be prevented from separating from the elastic clamping piece immediately, the delay effect of the extension switch is guaranteed, and the operation stability of the vacuum load switch is guaranteed.

In foretell vacuum load switch, the push rod is arc cylinder pole, the elasticity clamping piece includes two shell fragments that relative interval set up, the shell fragment has the clamping part that is the evagination circular-arc and is used for the joint push rod, the outer end of clamping part expands outward and forms the guide part. When the shell relatively conducts the electrical pillar and swings outward, the shell can drive the push rod to move outward along the clamping part and the guide part in sequence when rotating relative to the shell, so that the delay effect of the delay switch is ensured, the problem that the push rod is separated from the elastic clamping piece before the movable contact rod and the static contact rod are separated to cause the electric arc to be easily generated at the push rod is avoided, and the operation stability of the vacuum load switch is improved.

In the vacuum load switch, the upper end of the shell is also provided with a pull ring, and the pull ring and the push rod are arranged at an interval relatively. The shell is driven to swing through the pull ring, and operation convenience of opening and closing of the vacuum load switch is improved. Preferably, the pull ring is provided with an opening, so that the pull rod can be conveniently inserted into the pull ring, and then the pull rod is driven by an electric or manual driver to drive the pull ring and the shell to swing.

Compared with the prior art, the invention has the following advantages:

1. the shell is swung outwards or swung backwards on the base, the cam is driven, the switch-on and switch-off of the vacuum load switch are achieved through the extension switch, operation is safe, compared with the prior art, the structural design is simple and reasonable, low-cost production is facilitated, crank arm transmission is avoided, and control precision and stability of switch-on and switch-off operation of the vacuum load switch can be guaranteed.

2. The cam is arranged inside the shell, so that the working safety of the cam is improved, and the operation stability of the vacuum load switch is guaranteed.

Drawings

Fig. 1 is a schematic view of the overall structure of the present embodiment during closing.

Fig. 2 is a sectional view of fig. 1.

Fig. 3 is a schematic view of the overall structure of the housing of the present embodiment when swung to the first position.

Fig. 4 is a schematic view of the overall structure of the housing of the present embodiment when swung to the second position.

Fig. 5 is a cross-sectional view of fig. 4.

Fig. 6 is a schematic view of the structure of the cam abutting member and the cam.

In the figure, 1, a base; 2. a housing; 3. a vacuum arc-extinguishing chamber; 4. a movable contact rod; 5. a stationary contact bar; 6. a cam; 61. a convex curved surface; 62. a concave curved surface; 7. a cam abutment; 71. a top plate; 72. a limiting plate; 73. a second rotating shaft; 8. a delay switch; 9. an elastic clip; 91. a spring plate; 911. a clamping portion; 912. a guide portion; 10. a push rod; 11. a first rotating shaft; 12. a return spring; 13. a conductive post; 14. and (4) a pull ring.

Detailed Description

The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.

As shown in fig. 1 and 2, the present embodiment includes a base 1, a cylindrical housing 2 and a conductive column 13 disposed at an interval, the housing 2 and the conductive column 13 are both sleeved with an insulating sleeve, and the lower end of the housing 2 is hinged to the base 1, so that the housing 2 can rotate on the base 1. The vacuum arc extinguish chamber 3 is arranged in the shell 2, the vacuum arc extinguish chamber 3 comprises a vacuum chamber, a static contact rod 5 and a movable contact rod 4 contacted with the static contact rod 5 are inserted in the vacuum chamber, the movable contact rod 4 can move up and down along the vacuum chamber, and a return spring 12 enabling the movable contact rod 4 to always have a trend of being far away from the static contact rod 5 is also arranged in the shell 2. The upper end of the conductive column 13 is fixedly connected with an elastic clamping piece 9 of a delay switch 8, the upper end of the shell 2 is provided with a push rod 10 of the delay switch 8, one end of the push rod 10 is clamped with the elastic clamping piece 9, and the other end of the push rod 10 is hinged with the shell 2. The base 1 is fixedly connected with a cam 6 which is provided with a convex curved surface 61 and a concave curved surface 62 for the lower end of the movable contact rod 4 to abut against. When the lower end of the movable contact rod 4 is abutted against the convex curved surface 61, the movable contact rod 4 is contacted with the static contact rod 5, the delay switch 8 is switched on, the reset spring 12 is pressed to store energy, and the current flowing in from the conductive post 13 can sequentially flow through the delay switch 8, the static contact rod 5, the movable contact rod 4 and the cam 6. As shown in fig. 3, when the pushing housing 2 swings outward to the first position relative to the conductive column 13, the lower end of the movable contact rod 4 rolls along the convex curved surface 61 to the concave curved surface 62, the return spring 12 resets to release energy to push the cam 6 to move downward and abut against the concave curved surface 62, so that the movable contact rod 4 moves downward and is separated from the stationary contact rod 5, and at this time, the time delay switch 8 is still in the on state and no current passes through. As shown in fig. 4 and 5, when the housing 2 is further pushed to swing the housing 2 to the second position with respect to the conductive pillar 13, the lower end of the movable contact rod 4 rolls along the concave curved surface 62 and keeps the movable contact rod 4 separated from the stationary contact rod 5, and the delay switch 8 is turned off. On the contrary, when the housing 2 is pushed to make the housing 2 swing back relative to the conductive column 13, the time delay switch 8 is firstly switched on and then the movable contact rod 4 contacts with the fixed contact rod 5 again. Therefore, arc sparks generated at the time delay switch 8, the movable contact rod 4 and the fixed contact rod 5 during opening and closing operations can be avoided, and the control precision and the operation stability of the embodiment can be improved. This embodiment structural design is succinct reasonable, and the installation and the operation of being convenient for are favorable to reduction in production cost, and do not have the turning arm transmission, can avoid the problem that the articulated department of turning arm appears becoming flexible or wearing and tearing easily after the operation of switching on and switching off many times, improve the control accuracy and the operating stability of this embodiment.

The convex curved surface 61 and the concave curved surface 62 are connected and are both located on the upper end surface of the cam 6, the convex curved surface 61 is located on one side of the cam 6 close to the conductive column 13, and the concave curved surface 62 is located on one side of the cam 6 far away from the conductive column 13, so that the lower end of the movable contact rod 4 is driven to roll towards the concave curved surface 62 along the convex curved surface 61 when the shell 2 is pulled outwards to swing outwards relative to the conductive column 13. The convex curved surface 61 is a convex arc surface, so that the lower end of the movable contact rod 4 can roll smoothly on the convex curved surface 61. Concave curved surface 62 includes interior concave section one that links to each other with convex curved surface 61 and the interior concave section two that links to each other with interior concave section one, interior concave section one is the arc surface of indent with interior concave section two, and the diameter of interior concave section one is greater than between interior concave section two, when casing 2 is led electrical pillar 13 and is swung outward to the first position relatively, movable contact rod 4 lower extreme supports and leans on interior concave section one, when casing 2 is led electrical pillar 13 outward and is swung to the second position relatively, movable contact rod 4 lower extreme supports and leans on interior concave section two, can ensure that movable contact rod 4 lower extreme rolls along concave curved surface 62 and supports all the time on concave curved surface 62, be favorable to ensureing to operate and feel and operating stability. Cam 6 is located casing 2, is favorable to improving the space utilization in casing 2, can improve cam 6's operational safety, ensures the operating stability of this embodiment.

The lower extreme of casing 2 articulates on cam 6 through pivot one 11, makes casing 2 articulate on base 1 through pivot one 11 and cam 6, and structural design is succinct reasonable, and compact structure is convenient for promote the swing of casing 2, ensures the operating stability of this embodiment.

As shown in fig. 6, the lower end of the movable contact rod 4 is abutted against the convex curved surface 61 through the cam 6, and the cam abutting piece 7 is fixedly connected with the movable contact rod 4 through a bolt, so that the installation, the disassembly and the maintenance are convenient. The cam abutting piece 7 comprises a top plate 71 fixedly connected with the lower end of the movable contact rod 4, two limiting plates 72 arranged at opposite intervals are arranged on the top plate 71, the cam 6 is located between the two limiting plates 72, and the cam abutting piece 7 further comprises a second rotating shaft 73 penetrating through the two limiting plates 72 and abutting against the cam 6. The first limiting plate 72 can limit the first rotating shaft 11, so that the first rotating shaft 11 is prevented from deviating along the rolling of the cam 6, the cam abutting part 7 is guaranteed to roll along the cam 6, and the operation stability of the embodiment is improved. Two limiting plates 72 are located above the first rotating shaft 11 and are spaced from the first rotating shaft 11, so that the cam abutting part 7 can roll along the cam 6, the phenomenon that the second rotating shaft 73 is separated from the concave curved surface 62 due to the fact that the limiting plates 72 abut against the first rotating shaft 11 can be avoided, the second rotating shaft 73 drives the movable contact rod 4 to move downwards, and therefore the operation stability of opening the brake in the embodiment is guaranteed.

The push rod 10 is an arc-shaped cylindrical rod, the elastic clamping piece 9 comprises two elastic pieces 91 which are arranged at opposite intervals, each elastic piece 91 is provided with a clamping part 911 which is in a convex arc shape and is used for clamping the push rod 10, and the outer end of each clamping part 911 is outwards expanded to form a guide part 912. When the housing 2 swings outwards relative to the conductive column 13, the push rod 10 can be driven to move outwards along the clamping portion 911 and the guide portion 912 in sequence while rotating relative to the housing 2, so that the delay effect of the delay switch 8 is ensured, the problem that the push rod 10 is separated from the elastic clamping piece 9 before the movable contact rod 4 and the static contact rod 5 are separated to cause electric arc to be easily generated at the position of the push rod 10 is avoided, and the operation stability of the embodiment is improved.

The upper end of the shell 2 is also provided with a pull ring 14, and the pull ring 14 is opposite to the push rod 10 at a spacing. The casing 2 is driven to swing through the pull ring 14, and operation convenience of opening and closing the switch in the embodiment is improved. The pull ring 14 is provided with an opening for facilitating the insertion of the pull ring into the pull ring 14, and then the pull ring 14 and the shell 2 are driven to swing by electric or manual driving of the pull ring.

The reset spring 12 is a compression spring, the upper end of the reset spring 12 abuts against the bottom wall of the vacuum arc-extinguishing chamber 3, the lower end of the reset spring 12 abuts against the top plate 71, and the reset spring 12 is simple in structure and convenient to install.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.

Although 1, the base is used more herein; 2. a housing; 3. a vacuum arc-extinguishing chamber; 4. a movable contact rod; 5. a stationary contact bar; 6. a cam; 61. a convex curved surface; 62. a concave curved surface; 7. a cam abutment; 71. a top plate; 72. a limiting plate; 73. a second rotating shaft; 8. a delay switch; 9. an elastic clip; 91. a spring plate; 911. a clamping portion; 912. a guide portion; 10. a push rod; 11. a first rotating shaft; 12. a return spring; 13. a conductive post; 14. pull tab and the like, but does not exclude the possibility of using other terms. These terms are used merely to more conveniently describe and explain the nature of the present invention; they are to be construed as being without limitation to any additional limitations that may be imposed by the spirit of the present invention.

Claims

1. A vacuum load switch comprises a base (1), wherein a conductive column (13) and a shell (2) which are arranged at opposite intervals are arranged on the base (1), a vacuum arc extinguish chamber (3) is arranged in the shell (2), the vacuum arc extinguish chamber (3) comprises a static contact rod (5), a movable contact rod (4) and a reset spring (12) which can enable the movable contact rod (4) to always have the trend of being far away from the static contact rod (5), the vacuum load switch is characterized in that the upper end of the conductive column (13) is connected with the upper end of the shell (2) through a delay switch (8), the lower end of the shell (2) is hinged with the base (1), a cam (6) with a convex curved surface (61) and a concave curved surface (62) is fixedly connected on the base (1), when the lower end of the movable contact rod (4) is abutted against the convex curved surface (61), the movable contact rod (4) is contacted with the static contact rod (5) and the delay switch (8) is communicated, when the shell (2) swings outwards to a first position relative to the conductive column (13), the lower end of the movable contact rod (4) abuts against the concave curved surface (62), the movable contact rod (4) is separated from the static contact rod (5) and the delay switch (8) keeps a connected state, and when the shell (2) swings outwards relative to the conductive column (13) to a second position, the movable contact rod (4) and the static contact rod (5) keep a separated state and the delay switch (8) is disconnected.

2. Vacuum load switch according to claim 1, characterized in that the cam (6) is located inside the housing (2).

3. Vacuum load switch according to claim 1, characterized in that the lower end of the housing (2) is hinged to the cam (6) by means of a first pivot axis (11).

4. A vacuum load switch according to claim 3, characterized in that the lower end of the movable contact rod (4) abuts against the cam (6) through a cam abutting piece (7).

5. The vacuum load switch according to claim 4, wherein the cam abutting member (7) comprises a top plate (71) fixedly connected with the lower end of the movable contact rod (4), two limiting plates (72) are arranged on the top plate (71) at an interval, the cam (6) is located between the two limiting plates (72), and the cam abutting member (7) further comprises a second rotating shaft (73) which passes through the two limiting plates (72) and abuts against the cam (6).

6. The vacuum load switch according to claim 1, wherein the delay switch (8) comprises an elastic clamping piece (9) arranged at the upper end of the conductive column (13) and a push rod (10) arranged at the upper end of the housing (2), one end of the push rod (10) is used for being clamped with the elastic clamping piece (9), and the other end of the push rod (10) is hinged with the housing (2).

7. The vacuum load switch according to claim 6, wherein the push rod (10) is an arc-shaped cylindrical rod, the elastic clamping piece (9) comprises two elastic pieces (91) which are oppositely arranged at intervals, the elastic pieces (91) are provided with clamping parts (911) which are in an outer convex arc shape and used for clamping the push rod (10), and the outer ends of the clamping parts (911) are expanded outwards to form guide parts (912).

8. Vacuum load switch according to any of claims 1 to 7, characterized in that the housing (2) is further provided at its upper end with a pull ring (14), said pull ring (14) being spaced opposite the push rod (10).