CN113270290A

CN113270290A - Isolating switch

Info

Publication number: CN113270290A
Application number: CN202010096207.9A
Authority: CN
Inventors: 冯光
Original assignee: Petrochina Co Ltd
Current assignee: Petrochina Co Ltd
Priority date: 2020-02-17
Filing date: 2020-02-17
Publication date: 2021-08-17

Abstract

The embodiment of the invention provides an isolating switch, which belongs to the technical field of control of power distribution cabinets and comprises a power supply switch, a brake handle and a connecting piece, wherein the connecting piece is arranged between the power supply switch and the brake handle; the electromagnetic mechanism is arranged on the connecting piece, and the electromagnetic mechanism is arranged on the connecting piece; the elastic force of the elastic piece drives the locking piece to move to an unlocking position which is matched with the limiting piece to limit the movement of the connecting piece; the electromagnetic mechanism is in on-off linkage with the isolating switch, and drives the locking piece to move to a locking position allowing the limiting piece to move along with the connecting piece after the electromagnetic mechanism is electrified. Through locking piece unblock or locking connecting piece by electromagnetic mechanism and elastic component control, and then lock isolator, when switch board internal circuit got electric, electromagnetic mechanism got electric, and the connecting piece is locked, makes the unable removal of connecting piece, and then has avoided the condition of disconnection power supply circuit under the control circuit circumstances of getting electric, stops the maloperation of taking the load to break off the floodgate.

Description

Isolating switch

Technical Field

The invention relates to the technical field of power distribution cabinet control, in particular to an isolating switch.

Background

The high-voltage motor control cabinet is also called a power distribution cabinet, and is a semi-closed metal cabinet which is formed by assembling switch equipment, measuring instruments, protective electrical appliances, auxiliary equipment and the like according to the electrical wiring requirements, and the internal circuit of the semi-closed metal cabinet is generally divided into a low-voltage control loop and a high-voltage power supply loop for providing power for a motor. Because of high voltage of the high-voltage power supply loop, how to safely control the on-off of the high-voltage power supply loop is the focus of current research.

In the related art, the on/off of the high-voltage power supply loop is controlled by an isolating switch, fig. 1 is a schematic structural diagram of a conventional isolating switch, as shown in fig. 1, the isolating switch includes a switch handle 2 arranged on the outer side of a control cabinet housing 1, the switch handle 2 is in transmission connection with a switch 62 in the control cabinet housing 1 through a pull rod 4, and the switch 62 is provided with a contact 63 capable of contacting with a contact 64 in the control cabinet housing 1, so as to conduct the high-voltage power supply loop. When the motor is normally turned off, firstly, an operator presses a stop button of the low-voltage control loop, the switch handle 2 is toggled after the low-voltage control loop is powered off, the pull rod 4 drives the disconnecting link 62 to rotate around the disconnecting link base 61, the contact 63 is separated from the contact 64, and the high-voltage power supply loop is powered off.

However, the existing isolating switch can still be operated under the condition that a control loop is not disconnected, so that the switch is pulled out with load, when a high-voltage circuit is loaded, the isolating switch is disconnected, so that high-voltage electric arc can be caused, a cabinet is burnt to cause fire and property loss, and personnel get an electric shock to cause casualty accidents.

Disclosure of Invention

The embodiment of the invention provides an isolating switch, which is used for solving the problem that the isolating switch in the related art can still be operated under the condition that a control loop is not disconnected, so that the switch is pulled out under load.

The embodiment of the invention provides an isolating switch, which comprises a power supply switch, a brake handle and a connecting piece, wherein the connecting piece is arranged between the power supply switch and the brake handle; the electromagnetic mechanism is arranged on the connecting piece, and comprises a limiting piece arranged on the connecting piece, a locking piece moving relative to the limiting piece, an elastic piece acting on the locking piece and an electromagnetic mechanism; the locking piece is driven to move to an unlocking position matched with the limiting piece to limit the movement of the connecting piece by the elastic force of the elastic piece; the electromagnetic mechanism is in on-off linkage with the isolating switch, and drives the locking piece to move to a locking position allowing the limiting piece to move along with the connecting piece after power is supplied.

The disconnecting switch as described above, wherein the connecting member includes a pull rod connected between the brake handle and the power supply switch, and the limiting member is disposed on the pull rod.

The isolating switch as described above, wherein the isolating switch includes a housing, the locking member is slidably mounted to the housing along a first direction, and the elastic member and the electromagnetic mechanism act on the locking member in an acting direction parallel to the first direction.

The isolating switch as described above, wherein the locking element is provided with a through cavity allowing the pull rod to pass through, and the through cavity includes, along the first direction, an unlocking cavity allowing the limiting element to pass through and a locking cavity blocking the limiting element from passing through.

The isolating switch as described above, wherein the housing is provided with rail grooves corresponding to the locking pieces on two sides in the first direction, and the locking pieces are slidably disposed in the rail grooves.

The isolating switch as described above, wherein the elastic element is a tension spring disposed between the housing and the locking element, and the tension spring is disposed at one end of the locking element along the first direction.

The isolating switch as described above, wherein the electromagnetic mechanism is disposed at the other end of the locking member along the first direction, and a limiting step for mounting the electromagnetic mechanism is formed on the housing.

The isolating switch as above, wherein the locking element moves in a second direction close to and away from the limiting element, and during the movement, the locking element is located in the movement region of the limiting element to prevent the limiting element from moving, and the unlocking element is located away from the limiting element.

The disconnecting switch as described above, wherein the locking member is a rotating plate that moves about an axis parallel to the action direction of the pull rod, and the rotating plate has the locking position and the unlocking position during the movement.

The isolating switch as described above, wherein the rotating plate is provided with a through cavity allowing the pull rod to pass through, and the through cavity is provided with an unlocking cavity allowing the limiting member to pass through and a locking cavity blocking the limiting member to pass through along the rotating direction of the rotating plate.

The disconnecting switch comprises a control cabinet shell, the connecting piece comprises a pull rod and a connecting disc rotatably mounted on the control cabinet shell, the brake handle is mounted on the connecting disc, one end of the pull rod is hinged to the connecting disc, and the other end of the pull rod is connected to the power supply switch; the limiting piece comprises a notch arranged at the edge of the connecting disc; the locking piece has the locking position that is in the breach in order to prevent the locating part in the motion process to, and, keep away from the locating part the unblock position.

The isolating switch comprises a shell, a locking piece and an electromagnetic mechanism, wherein the shell is fixedly arranged on the shell, the electromagnetic mechanism is arranged on the shell, the locking piece is fixedly arranged on the shell, and the electromagnetic mechanism is arranged on the shell; the two ends of the elastic part are respectively connected with the bracket and the rotating rod.

The isolating switch further comprises a baffle plate, wherein the baffle plate is arranged on the rotating path of the rotating rod to limit the moving range of the rotating rod.

The isolating switch comprises a power supply loop and a control loop, wherein the control loop comprises a first contactor, and the electromagnetic mechanism is connected to two ends of the low-voltage coil of the first contactor.

According to the isolating switch provided by the embodiment of the invention, the connecting piece is unlocked or locked through the locking piece controlled by the electromagnetic mechanism and the elastic piece, so that the isolating switch is locked, when a circuit in the control cabinet is electrified, the electromagnetic mechanism is electrified, the connecting piece is locked, and the connecting piece cannot move, so that the condition that a power supply loop is disconnected under the condition that the control loop is electrified is avoided, only when the control loop is powered off, the electromagnetic mechanism loses electricity, the locking piece moves to the unlocking position under the elastic action of the elastic piece, the connecting piece can normally move, the correct operation sequence of the isolating switch, the starting button and the stopping button is effectively ensured, and the misoperation of pulling a brake with a load is avoided. The problem of in the correlation technique isolator can still operate under the condition of not breaking off control circuit, cause the on-load to break off is solved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a conventional isolating switch;

fig. 2 is a schematic structural diagram of a disconnecting switch according to a first embodiment of the present invention;

fig. 3 is a schematic side view of a disconnecting switch according to an embodiment of the present invention;

FIG. 4 is a schematic structural diagram of a locking element according to an embodiment of the present invention;

FIG. 5 is a front view of a housing according to an embodiment of the present invention;

fig. 6 is a schematic circuit diagram of a control cabinet according to an embodiment of the present invention;

FIG. 7 is a schematic structural diagram of another locking element according to an embodiment of the present invention;

FIG. 8 is a schematic structural diagram of another locking element according to an embodiment of the present invention;

fig. 9 is a schematic structural diagram of a disconnecting switch according to a second embodiment of the present invention;

fig. 10 is a schematic side view of a disconnector according to a second embodiment of the present invention.

Description of reference numerals:

1: a control cabinet housing;

2: a brake handle;

31: a housing;

32: an electromagnetic mechanism;

33: a limiting step;

34: a track groove;

35: a locking member;

36: an unlock cavity;

37: a locking cavity;

38: an elastic member;

39: a first opening;

4: a connecting member;

41: connecting the disks;

5: a limiting member;

51: a notch;

6: a power supply switch;

61: a disconnecting link base;

62: a disconnecting link;

63: a contact;

64: a contact;

71: a power supply loop;

72: a control loop;

73: a first contactor;

74: a second contactor;

75: a motor;

76: an isolating switch;

77: a low-voltage coil;

78: a start button;

79: a stop button;

8: a support;

9: and a baffle plate.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. The embodiments described below and the features of the embodiments can be combined with each other without conflict.

In the present invention, unless otherwise specifically stated, the terms "mounted," "connected," "fixed," and the like are to be understood broadly, and for example, may be fixedly connected, detachably connected, or integrally formed, mechanically connected, electrically connected, or communicable with each other; they may be directly connected or indirectly connected through an intermediate medium, or they may be connected internally or in any other manner known to those skilled in the art, unless otherwise specifically limited. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

The embodiment of the invention provides an isolating switch with an electromagnetic locking device, aiming at improving the condition that the isolating switch of the existing high-voltage motor control cabinet is switched off under load. In a traditional high-voltage motor control cabinet, a typical circuit structure of the high-voltage motor control cabinet comprises a power supply loop and a control loop, wherein the power supply loop controls power on and off through an isolating switch, and the control loop controls power on and off through a start button and a stop button. The isolating switch is used as a disconnection point, an arc extinguishing device is not arranged, and the current which can be borne by the isolating switch is small, so that the isolating switch is forbidden to be opened in the high-voltage field, namely, the isolating switch is forbidden to be opened when a control loop is electrified. However, in the existing high-voltage control cabinet, the start button, the stop button and the isolating switch are separately arranged, and there is no correlation, so that an operator inevitably pulls the switch with load during operation, which causes damage to the system or personal safety accidents.

In view of this, the embodiment of the invention provides an isolating switch, which starts from two aspects of circuit control logic and hardware equipment to improve the current condition of on-load switching. Firstly, an electromagnetic locking device installed inside a control cabinet is introduced to hardware equipment, and the isolating switch can be selectively locked or unlocked. Secondly, on the control logic, the electromagnetic locking device is controlled by the power-on and power-off signal of the internal circuit of the control cabinet, when the internal circuit of the control cabinet is powered off, the electromagnetic locking device is unlocked, the isolating switch can operate, when the internal circuit of the control cabinet is powered on, the electromagnetic locking device is locked, the isolating switch cannot operate, and therefore the condition that the isolating switch is subjected to load switching-off is effectively improved.

Example one

Fig. 1 is a schematic structural diagram of a conventional disconnecting switch, fig. 2 is a schematic structural diagram of a disconnecting switch according to a first embodiment of the present invention, fig. 3 is a schematic side structural diagram of a disconnecting switch according to a first embodiment of the present invention, fig. 4 is a schematic structural diagram of a locking member according to a first embodiment of the present invention, fig. 5 is a front view of a housing according to a first embodiment of the present invention, fig. 6 is a schematic circuit diagram of a control cabinet according to a first embodiment of the present invention, fig. 7 is a schematic structural diagram of another locking member according to a first embodiment of the present invention, and fig. 8 is a schematic structural diagram of yet another locking member according to a first embodiment of the present invention.

Please refer to fig. 1 to 8. The first embodiment provides an isolating switch, which comprises a power supply switch 6, a brake handle 2 and a connecting piece 4 arranged between the power supply switch 6 and the brake handle 2; the electromagnetic mechanism also comprises a limiting piece 5 arranged on the connecting piece 4, a locking piece 35 moving relative to the limiting piece 5, an elastic piece 38 acting on the locking piece 35 and the electromagnetic mechanism 32; the elastic force of the elastic member 38 drives the locking member 35 to move to the unlocking position in cooperation with the limiting member 5 to limit the movement of the link member 4. The electromagnetic mechanism 32 is in on-off linkage with the disconnecting switch, and drives the locking piece 35 to move to a locking position allowing the limiting piece 5 to move along with the connecting piece 4 after power is supplied.

The power supply switch 6 specifically includes a knife switch base 61, a knife switch 62, a contact 63, and a contact 64. As shown in fig. 2, the disconnecting link 62 is rotatably connected with the disconnecting link base 61 through a pin, the connecting member 4 is in transmission connection with the side surface of the disconnecting link 62, the switch handle 2 drives the disconnecting link 62 to rotate around the disconnecting link base 61 through the connecting member 4, so that the contact 63 is contacted with the contact 64, and the isolating switch is in a closed state; the contact 63 is separated from the contact 64 and the disconnector is in an open state. In the opening process of the isolating switch, the electromagnetic mechanism 32 drives the locking piece 35 to move to the locking position and keep in the power-on state, so that the movement of the connecting piece 4 is limited, the locking piece 35 returns to the unlocking position under the elastic force action of the elastic piece 38 when the electromagnetic mechanism 32 is in power-off state, the contact 63 and the contact 64 are separated after the connecting piece 4 can move freely, the isolating switch is opened, and the condition that the existing isolating switch is pulled with load is effectively improved.

For explaining the working logic of the isolating switch provided in the embodiment in detail, please refer to fig. 6, the control cabinet 1 includes two circuits, namely a control circuit 72 and a power supply circuit 71, the on/off state of the power supply circuit 71 is controlled by the isolating switch 76 and the control circuit 72 shown in the circuit, and the electromagnetic mechanism 32 can be electrically connected to any one of the circuits.

During normal starting, the isolating switch 76 shown in the circuit is closed, then the start button 78 is pressed, high-voltage current flows out from the power supply, becomes low-voltage current through the transformer, and then flows into the control loop 72, so that the control loop 72 is electrified, the coil of the first contactor 73 is electrified, magnetic force is generated, the high-voltage contact of the second contactor 74 is attracted to act, and then the power supply loop 71 is switched on, so that power is supplied to the motor 75 for operation. Meanwhile, after the electromagnetic mechanism 32 connected into the circuit is electrified, the locking piece 35 is driven to move to the locking position, the connecting piece 4 is locked, and the isolating switch cannot be opened.

During normal shutdown, because the connecting piece 4 is in the locked state, the isolator can not be disconnected, at this moment, the stop button 79 in the control circuit 72 must be pressed first to power off the control circuit 72, the coil of the first contactor 73 is powered off, the high-voltage contact of the second contactor 74 is not attracted any more, so that the power supply circuit 71 is powered off, the electromagnetic mechanism 32 is powered off, the locking piece 35 returns to the unlocking position under the action of elastic force, the connecting piece 4 is not locked any more, and the isolator can be opened.

The isolating switch provided by the embodiment unlocks or locks the connecting piece 4 through the locking piece 35 controlled by the electromagnetic mechanism 32 and the elastic piece 38, so that the isolating switch is locked, when an internal circuit of the control cabinet 1 is electrified, the electromagnetic mechanism 32 is electrified, the connecting piece 4 is locked, the connecting piece 4 cannot move, the condition that the power supply loop 71 is disconnected under the electrified condition of the control loop 72 is avoided, only when the control loop 72 is powered off, the electromagnetic mechanism 32 is powered off, the locking piece 35 moves to an unlocking position under the elastic action of the elastic piece 38, the connecting piece 4 can normally move, the correct operation sequence of the isolating switch 76, the starting button 78 and the stopping button 79 in the circuit is effectively ensured, the misoperation of pulling a gate with load is avoided, the accident caused by the misoperation is avoided, the safety of an electric power system where the isolating switch is located is increased, and the reliability of power supply is improved, and the safety of operators is guaranteed.

Further, as an alternative embodiment of the connecting member 4, in this embodiment, the connecting member 4 includes a pull rod connected between the brake handle 2 and the power supply switch 6, and the limiting member 5 is disposed on the pull rod.

Specifically, as shown in fig. 2, the pull rod is a cylindrical long rod disposed in the control cabinet housing 1 and used for connecting the switch handle 2 and the power supply switch 6, and when the switch handle 2 is toggled, the pull rod drives the knife switch 62 to rotate, so as to close or open the power supply switch 6.

It should be noted that the limiting member 5 may specifically be a limiting boss fixedly mounted on the pull rod through a threaded fastener, or may also be a limiting boss integrally formed with the pull rod, and the boss may take a regular shape such as a cube, a cylinder, or other irregular shapes, which is not limited in this embodiment.

Further, in the present embodiment, the isolating switch further includes a housing 31, the locking member 35 is slidably mounted on the housing 31 along a first direction, and the action direction of the elastic member 38 and the electromagnetic mechanism 32 on the locking member 35 is parallel to the first direction. The housing 31 serves to protect the locking member 35 and also serves as a carrier for movement of the locking member 35. The housing 31 may be fixedly mounted inside the control cabinet housing 1 by means of threaded fasteners. The locking member 35 is reciprocatable in a first direction between an unlocked position and a locked position by the resilient member 38 and the electromagnetic mechanism 32.

It should be noted that the direction of the elastic force applied to the locking member 35 by the elastic member 38 is opposite to the direction of the force applied to the locking member 35 by the electromagnetic mechanism 32, and the force of the electromagnetic mechanism 32 is greater than the elastic force of the elastic member 38, so that when the electromagnetic mechanism 32 is powered, the locking member 35 moves to the locking position and maintains the locking state until the electromagnetic mechanism 32 is powered off. The first direction is the direction in which the locking member 35 moves to the locking position. Wherein the locked position and the unlocked position are both on a path in a first direction. For example, the first direction may be a direction perpendicular or approximately perpendicular to the pull rod axis.

In addition, the specific shape of the housing 31 is not required in this embodiment, and the housing 31 may be a regular shape such as a cube, a cylinder, or other irregular shapes.

Optionally, when the first direction is a vertical direction and the height of the locked position is higher than that of the unlocked position, the elastic member 38 may be eliminated to further simplify the internal structure of the disconnector. Specifically, the locking member 35 moves to the locking position against gravity under the driving of the force of the electromagnetic mechanism 32, and automatically returns to the unlocking position under the action of gravity when the electromagnetic mechanism 32 is de-energized.

Further, the locking member 35 and the limiting member 5 may have various different engagement manners to limit the movement of the pull rod. As a possible embodiment, in the present embodiment, the locking member 35 is provided with a through cavity for allowing the pull rod to pass through, and the through cavity includes, in the first direction, an unlocking cavity 36 for allowing the limiting member 5 to pass through and a locking cavity 37 for blocking the limiting member 5 from passing through. The pull rod can move relative to the through cavity, when the locking piece 35 is located at the locking position, the limiting piece 5 on the pull rod is aligned to the position of the locking cavity 37, and when the locking piece 35 is located at the unlocking position, the limiting piece 5 is aligned to the position of the unlocking cavity 36, so that the locking or unlocking of the pull rod by the locking piece 35 is realized. When the locking member 35 is located at the locking position, the limiting member 5 abuts against a side wall of the locking member 35 facing the knife switch 62.

It should be noted that the shape of the through cavity, the locking cavity 37 and the unlocking cavity 36 is not required in this embodiment. For example, the through cavity may be a through groove having a rectangular cross section and penetrating the locking member 35, the cross-sectional width of the locking cavity 37 is smaller than that of the unlocking cavity 36, and the locking cavity 37 and the unlocking cavity 36 have a communicating portion for allowing the pull rod to move from the unlocking cavity 36 to the locking cavity 37 or from the locking cavity 37 to the unlocking cavity 36 relative to the through cavity.

Optionally, the locking element 35 may also be a limiting plate slidably disposed inside the housing 31, at this time, the locking cavity 37 and the unlocking cavity 36 are through grooves penetrating through the limiting plate, and the two through grooves have different sizes, wherein an opening area of the locking cavity 37 is smaller than a projection size of the limiting element 5 on the limiting plate, so as to limit the limiting element 5 from passing through, and an opening area of the unlocking cavity 36 is larger than a projection size of the limiting element 5 on the limiting plate, so as to facilitate the limiting element 5 from passing through.

In addition, as shown in fig. 5, a first opening 39 is further formed on the front and rear side walls of the through cavity of the housing 31, the first opening 39 allows the limiting member 5 to pass through, and when the locking member 35 is located inside the housing 31, the pull rod can pass through the through cavity of the locking member 35 through the first opening 39.

Further, in order to achieve the sliding mounting of the locking member 35 on the housing 31, in the present embodiment, the housing 31 is provided with rail grooves 34 for engaging with the locking member 35 on both sides in the first direction, and the locking member 35 is slidably disposed in the rail grooves 34. Specifically, the rail groove 34 is disposed on the inner side walls of the housing 31 at both sides with respect to the first direction, and has a rectangular parallelepiped hollow structure, and one end thereof is mounted on the bottom plate of the housing 31. It is understood that the extending direction of the track groove 34 coincides with the first direction. The locking member 35 is provided with an extension portion that can be inserted into the rail groove 34, and can be moved to a locking position or an unlocking position during sliding.

Further, as a possible embodiment of the elastic member 38, in the present embodiment, the elastic member 38 is a tension spring disposed between the housing 31 and the locking member 35, and the tension spring is disposed at one end of the locking member 35 in the first direction. Specifically, as shown in fig. 4, the tension spring is fixedly mounted on the base of the housing 31, and the other end is connected to the locking member 35. The electromagnetic mechanism 32 is located on the other end of the housing 31 opposite the tension spring. When the lock member 35 is in the lock position, the tension spring is in a stretched state. The unlocking mode of the locking member 35 is controlled purely mechanically, so that the reliability of the unlocking operation can be improved.

In addition, as another possible embodiment of the elastic member 38, the elastic member 38 may be a spring disposed between the housing 31 and the locking member 35, wherein the spring and the electromagnetic mechanism 32 are located at the same end of the housing 31, and the spring is in a compressed state when the locking member 35 is located at the locking position.

In addition to the above two embodiments, the elastic member 38 may be another member capable of generating an elastic force as long as the elastic force is opposite to the urging force of the motor mechanism and the elastic force is always smaller than the urging force.

Specifically, in the present embodiment, the electromagnetic mechanism 32 is disposed at the other end of the locking member 35 along the first direction, and the housing 31 is formed with a limit step 33 for mounting the electromagnetic mechanism 32. In a specific implementation, the wall thickness of the shell 31 is different at the front and the rear of the limit step 33, wherein the wall thickness of one side is greater than that of the other side, so that an "L" shaped step is formed inside the shell 31, and the electromagnetic mechanism 32 can be mounted on the limit step 33 through a threaded fastener.

Alternatively, in this embodiment, the wall thickness of the shell 31 can be kept uniform, and the limit step 33 can be an annular boss surrounding the inner wall of the shell 31 and mounted on the inner wall of the shell 31 by a threaded fastener. The bosses can be continuous or can be divided into a plurality of sections, and the limiting steps 33 are arranged on the inner wall of the shell 31 at intervals of a certain distance or angle and can be uniformly distributed or non-uniformly distributed.

Please refer to fig. 7. As another alternative way of matching the locking member 35 with the limiting member 5, in the present embodiment, the locking member 35 moves in a second direction close to and away from the limiting member 5, and during the movement, there are a locking position in the movement region of the limiting member 5 to prevent the limiting member 5 from moving, and an unlocking position away from the limiting member 5.

It should be noted that the locking element 35 may be a baffle or a boss that can slide on the housing 31 along a second direction, where the second direction may be a direction perpendicular or approximately perpendicular to the pull rod, the locking element 35 slides to a locking position under the driving of the electromagnetic mechanism 32, at this time, a part of the locking element 35 is attached to the limiting element 5, and the limiting element 5 abuts against a side surface of the locking element 35 facing the knife gate 62, so as to limit the movement of the limiting element 5, and at the same time, limit the movement of the pull rod. With this structure, it is not necessary to provide a through cavity in the locking member 35, and the internal structure of the disconnector can be further simplified.

Please refer to fig. 8. As yet another possible way of cooperating the locking member 35 with the limiting member 5, in this embodiment the locking member 35 is a rotating plate moving around an axis parallel to the action direction of the pull rod, and the rotating plate has a locking position and an unlocking position during movement. When the rotating plate rotates to a locking position under the action of the electromagnetic mechanism 32, the limiting piece 5 is limited to move, so that the pull rod is limited to move, and the isolating switch cannot be opened; when the electromagnetic mechanism 32 is powered off and the rotating plate rotates to the unlocking position under the elastic force of the elastic piece 38, the limiting piece 5 is not limited, and the pull rod can freely move, so that the isolating switch can be opened.

When the rotating plate is in the locked position, the stopper 5 is attached to a side surface of the rotating plate facing the disconnecting link.

Further, in the present embodiment, the rotating plate is provided with a through cavity for allowing the pull rod to pass through, an unlocking cavity 36 for allowing the limiting member 5 to pass through and a locking cavity 37 for blocking the limiting member 5 from passing through along the rotating direction of the rotating plate. The unlocking cavity 36 is communicated with the locking cavity 37, when the rotating plate rotates to the locking position, the limiting piece 5 on the pull rod is aligned to the locking cavity 37, and when the rotating plate rotates to the unlocking position, the limiting piece 5 is aligned to the unlocking cavity 36, so that the rotating plate can lock or unlock the pull rod. When the rotating plate is located at the locking position, the limiting member 5 abuts against the side wall of the rotating plate facing the disconnecting link 62.

Further, in this embodiment, the isolation switch includes a power supply circuit and a control circuit, the control circuit includes a first contactor, and the electromagnetic mechanism is connected to two ends of the low-voltage coil of the first contactor. When the control circuit 72 is powered on, the low-voltage coil 77 is powered on, so that the electromagnetic mechanism 32 is powered on, the connecting piece 4 is locked, the isolating switch cannot be operated, and the isolating switch is prevented from being opened under the condition that the control circuit 72 is electrified.

Optionally, in this embodiment, the electromagnetic mechanism 32 may be an electromagnet, and when the low-voltage coil 77 is powered on, the electromagnet is acted on to energize the electromagnet and generate an induction magnetic field, the locking member 35 is a metal member that can be acted on by a magnetic force, and after the electromagnet is powered on, the locking member 35 is attracted to move to the locking position, so as to lock the connecting member 4, and when the low-voltage coil 77 is powered off, the induction magnetic field of the electromagnet disappears, the action member is no longer acted on by the magnetic force, and returns to the unlocking position under the action of the elastic force.

Example two

On the basis of the first embodiment, the second embodiment further provides another isolating switch, and compared with the first embodiment, the second embodiment has the following difference: the realization of the connecting elements 4 is not identical.

Fig. 9 is a schematic structural diagram of a disconnector according to a second embodiment of the present invention; fig. 10 is a schematic side view of a disconnector according to a second embodiment of the present invention.

Please refer to fig. 9 and 10. The second embodiment provides another isolating switch, wherein the isolating switch includes a control cabinet housing 1, the connecting member 4 includes a pull rod and a connecting disc 41 rotatably mounted on the housing, the brake handle 2 is mounted on the connecting disc 41, one end of the pull rod is hinged to the connecting disc 41, and the other end of the pull rod is connected to the power supply switch 6. The limiting member 5 comprises a notch 51 arranged at the edge of the connecting disc 41. The locking member 35 has a locking position in the gap 51 to block the limiting member 5 during movement and an unlocking position away from the limiting member 5.

Specifically, the part of the connecting disc 41, which is located outside the control cabinet shell 1, is fixedly connected with the switch handle 2, when the switch handle 2 is pulled, the connecting disc 41 rotates, so that the driving pull rod moves, and the pull rod drives the disconnecting link 62 to rotate around the disconnecting link base 61 in the moving process, so that the power supply switch 6 is opened or closed.

When the electromagnetic mechanism 32 is powered, the locking member 35 is driven to move to the locking position, at this time, a part of the locking member 35 enters the notch 51 on the connecting disc 41, when the brake handle 2 is pulled downwards, the lower surface of the notch 51 is pressed against the locking member 35 and is blocked by the locking member 35, and the brake handle 2 cannot be operated. After the electromagnetic mechanism 32 loses power, the locking member 35 moves to the unlocking position under the elastic force of the elastic member 38, and the locking member 35 leaves from the notch 51, so that the connecting disc 41 is not limited by the locking member 35 any more, can rotate freely, and can be pulled out at the moment.

In addition, in the present embodiment, the shape of the notch 51 is not required, and the notch 51 may be a rectangular notch, for example.

Further, in order to facilitate the locking member 35 to be engaged with the notch 51 on the connecting disc 41, in this embodiment, the locking member 35 includes a bracket 8 fixedly mounted on the control cabinet housing 1, and a rotating rod rotatably mounted on the bracket 8, and one end of the rotating rod is engaged with the electromagnetic mechanism 32 and the other end is engaged with the elastic member 38 relative to the bracket 8. The elastic member 38 is connected to the bracket 8 and the rotating lever at both ends thereof, respectively.

Wherein the electromagnetic mechanism 32 and the elastic member 38 drive the rotation of the rotation lever in opposite directions. The support 8 is connected with the locking piece 35 through a pin

In order to prevent the rotating lever from rotating excessively, in the present embodiment, the disconnecting switch further includes a baffle plate 9, and the baffle plate 9 is disposed on the rotating path of the rotating lever to limit the moving range of the rotating lever. The baffle 9 can prevent the dwang from rotating excessively, in addition, can also provide the holding power when restriction floodgate handle 2 to avoid operating personnel to use hard too greatly to make the dwang exceed its rotation range.

Other technical features are the same as those of the first embodiment and can achieve the same technical effects, and are not described in detail herein.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An isolating switch is characterized by comprising a power supply switch, a brake handle and a connecting piece arranged between the power supply switch and the brake handle; the electromagnetic mechanism is arranged on the connecting piece, and comprises a limiting piece arranged on the connecting piece, a locking piece moving relative to the limiting piece, an elastic piece acting on the locking piece and an electromagnetic mechanism; the locking piece is driven to move to an unlocking position matched with the limiting piece to limit the movement of the connecting piece by the elastic force of the elastic piece; the electromagnetic mechanism is in on-off linkage with the isolating switch, and drives the locking piece to move to a locking position allowing the limiting piece to move along with the connecting piece after power is supplied.

2. The disconnector according to claim 1, wherein the connecting member comprises a pull rod connected between the handle and the power switch, and the stopper is disposed on the pull rod.

3. The disconnector according to claim 2, comprising a housing, wherein the locking member is slidably mounted to the housing in a first direction, and wherein the resilient member and the electromagnetic mechanism act on the locking member in a direction parallel to the first direction.

4. The isolating switch according to claim 3, wherein the locking member is provided with a through cavity allowing the pull rod to pass through, and the through cavity comprises an unlocking cavity allowing the limiting member to pass through and a locking cavity blocking the limiting member from passing through along the first direction.

5. The isolating switch according to claim 3 or 4, wherein the housing is provided with rail grooves corresponding to the locking members on two sides of the housing in the first direction, and the locking members are slidably disposed in the rail grooves.

6. The isolation switch of claim 3, wherein the elastic member is a tension spring disposed between the housing and the locking member, the tension spring being disposed at one end of the locking member along the first direction.

7. The isolating switch according to claim 6, wherein the electromagnetic mechanism is disposed at the other end of the locking member along the first direction, and a limit step for mounting the electromagnetic mechanism is formed on the housing.

8. The disconnect switch of claim 2, wherein the locking member moves in a second direction toward and away from the limit member, with the locking position in the area of movement of the limit member to prevent movement of the limit member and the unlocking position away from the limit member.

9. A disconnector according to claim 2, characterized in that the locking member is a pivotal plate which is movable about an axis parallel to the direction of action of the pull rod, the pivotal plate having the locking position and the unlocking position during movement.

10. The isolating switch according to claim 9, wherein the rotating plate is provided with a through cavity allowing the pull rod to pass through, and the through cavity is provided with an unlocking cavity allowing the limiting member to pass through and a locking cavity blocking the limiting member from passing through along the rotating direction of the rotating plate.

11. The isolating switch according to claim 1, wherein the isolating switch comprises a control cabinet shell, the connecting piece comprises a pull rod and a connecting disc rotatably mounted on the control cabinet shell, the brake handle is mounted on the connecting disc, one end of the pull rod is hinged with the connecting disc, and the other end of the pull rod is connected to the power supply switch; the limiting piece comprises a notch arranged at the edge of the connecting disc; the locking piece has the locking position that is in the breach in order to prevent the locating part in the motion process to, and, keep away from the locating part the unblock position.

12. The isolating switch according to claim 11, wherein the locking member comprises a bracket fixedly mounted to the cabinet housing, and a rotating lever rotatably mounted to the bracket, the rotating lever engaging the electromagnetic mechanism at one end with respect to the bracket and engaging the elastic member at the other end; the two ends of the elastic part are respectively connected with the bracket and the rotating rod.

13. The disconnector according to claim 12, further comprising a baffle plate disposed on a rotation path of the rotation lever to limit a movement range of the rotation lever.

14. The isolation switch of claim 1, wherein the isolation switch comprises a power supply circuit and a control circuit, the control circuit comprises a first contactor, and the electromagnetic mechanism is connected across a low-voltage coil of the first contactor.