CN104269320A - Novel high-voltage switch on-off transmission device - Google Patents

Abstract

The invention discloses a novel high-voltage switch splitting and closing transmission device, which includes a main shaft and an insulating pull rod. The main shaft is provided with a crank arm, the outer end of the crank arm is provided with a slider, the insulating pull rod is provided with an insulating pull rod insert, and an insulating pull rod insert is provided. Threaded insulating pull rod inserts pass through the center hole of the slider, and the insulating pull rod inserts on both sides of the slider are respectively provided with fixing nuts. Both ends of the slider are respectively provided with a shaft head, and the outer end of the crank arm is provided with an oblong hole, and the shaft head is inserted into the oblong hole. The slide block is provided with a threaded hole for installing the mechanical characteristic detection equipment of the high voltage switch. A guide plate is fixed on the side plate, and a guide hole is arranged on the guide plate, and the end of the insulating pull rod insert is inserted into the guide hole. The structure of the overtravel adjustment is simplified and the adjustment accuracy of the overtravel is improved, the breaking and closing ability of the high-voltage switch is improved, and the service life of the vacuum interrupter is improved, and the product cost is reduced to a certain extent.

Description

A new type of high-voltage switch opening and closing transmission device

technical field

The invention relates to an on-off operation device of a high-voltage circuit breaker, in particular to a novel on-off transmission device of a high-voltage switch.

Background technique

At present, the opening and closing operation of high-voltage circuit breakers on the market is mostly realized through the reciprocating movement of the insulating pull rod driven by the crank arm on the main shaft, and the closing overtravel of the vacuum interrupter is changed by adjusting the connection between the insulating pull rod and the crank arm . However, in this transmission mode, the crank arm on the main shaft rotates, which drives the connection point between the insulating rod and the crank arm to rotate around the main shaft as the rotation axis, resulting in a non-linear motion of the insulating rod. This transmission mode makes the high-voltage circuit breaker open and close, the contact surface of the dynamic and static contacts in the vacuum interrupter is unevenly stressed, which will reduce the breaking capacity of the high-voltage circuit breaker; in addition, because the insulating rod drives the vacuum interrupter The non-linear movement of the moving contact will damage the bellows in the vacuum interrupter during long-term work, and eventually lead to the destruction of the vacuum interrupter, which may lead to safety accidents.

The first prior art, as shown in Fig. 1a and Fig. 1b, uses a joint bearing as a connecting piece between an insulating pull rod and a crank arm. First, the joint bearing is fixed on the insulating pull rod through threads; then the joint bearing is connected to the crank arm of the main shaft by a pin shaft to realize the transmission. The adjustment of the overtravel is realized by adjusting the length of the threaded connection between the joint bearing and the insulating rod. But in order to make the pin shaft connect the joint bearing with the crank arm, each joint bearing can only rotate an integer multiple of 180°.

Above-mentioned prior art one has following shortcoming at least:

In this scheme, there is a force perpendicular to the crank arm during the transmission process, and the direction of the force is not in line with the axis of the vacuum interrupter, so that the insulating rod cannot move in a straight line, but moves up and down;

Because this solution uses the shutdown bearing as the connecting piece, the insulating rod will swing up and down and left and right during the movement, which will damage the bellows in the vacuum interrupter;

This solution is very inconvenient to adjust the overtravel, and the pin shaft needs to be removed from the crank arm for adjustment every time;

The accuracy of adjusting the overtravel of this scheme is relatively low, and each overtravel can only be adjusted by an integer multiple of 0.5mm.

The second prior art, as shown in Figure 2, differs from the first prior art in that an adjustment rod is added between the insulating pull rod and the joint bearing as a transition piece, and both ends of the adjustment rod are threaded They are respectively connected with insulating pull rods and joint bearings, so as to realize the on-off transmission of the high-voltage circuit breaker, and the adjustment of the overtravel is to change the overtravel by changing the threaded length of the adjusting rod.

There are at least the following disadvantages in the prior art two:

This solution requires enough space between the crank arm and the insulating pull rod to install the adjusting rod, which violates the current concept of miniaturization design of high-voltage circuit breakers; and this solution also has the first two disadvantages of prior art 1.

Contents of the invention

The purpose of the present invention is to provide a new high-voltage switch switching transmission device with simple adjustment, high precision, strong breaking and closing capabilities, and long service life.

The purpose of the present invention is achieved through the following technical solutions:

The new high-voltage switch switching transmission device of the present invention includes a main shaft and an insulating pull rod. The main shaft is provided with a crank arm, the outer end of the crank arm is provided with a slider, and the insulating pull rod is provided with an insulating pull rod insert. Threads are provided on the insulating pull rod inserts, and the insulating pull rod inserts pass through the center hole of the slider, and fixing nuts are respectively provided on the insulating pull rod inserts on both sides of the slider.

It can be seen from the above-mentioned technical solutions provided by the present invention that in the novel high-voltage switch switching transmission device provided by the embodiment of the present invention, since the main shaft is provided with a crank arm, the outer end of the crank arm is provided with a slider, and the insulating pull rod insert is provided with a slider. There are threads, and the insulating pull rod insert passes through the center hole of the slider and is fixed by two fixing nuts, which simplifies the structure of the overtravel adjustment and improves the adjustment accuracy of the overtravel, and improves the breaking and closing capabilities of the high-voltage switch. And the service life of the vacuum interrupter is improved, and the product cost is reduced to a certain extent.

Description of drawings

Fig. 1a is a schematic diagram of the side structure of a high-voltage switch switching transmission device in prior art 1;

Fig. 1b is a schematic diagram of the end face structure of the high-voltage switch switching transmission device in the prior art 1;

Fig. 2 is a side structural schematic diagram of a high-voltage switch switching transmission device in the second prior art;

Fig. 3a is a schematic side view of the new high-voltage switch switching transmission device provided by the embodiment of the present invention;

Figure 3b is a schematic view of the end face structure of the new high-voltage switch switching transmission device provided by the embodiment of the present invention;

Fig. 3c is a three-dimensional structural schematic diagram of the new high-voltage switch switching transmission device provided by the embodiment of the present invention;

Fig. 4a is a schematic structural diagram of a slider in an embodiment of the present invention;

Fig. 4b is a top view structural schematic diagram of Fig. 4a;

Fig. 5 is a schematic structural diagram of the crank arm in the embodiment of the present invention.

In the picture:

01. Insulated tie rod, 02. Joint bearing, 03. Knee arm, 04. Main shaft, 05. Pin shaft, 06. Adjusting rod;

1. Side plate, 2. Slider, 3. Insulated tie rod insert, 4. Insulated tie rod, 5. Turn arm, 6. Guide plate, 7. First bushing, 8. Second bushing, 9. Main shaft, 10. Center hole, 11. Shaft head, 12. Threaded hole for installing high-voltage switch mechanical characteristic testing equipment, 13. Oval hole.

Detailed ways

The embodiments of the present invention will be further described in detail below.

The preferred embodiment of the novel high-voltage switch switching transmission device of the present invention is:

It includes a main shaft and an insulating pull rod, the main shaft is provided with a crank arm, the outer end of the crank arm is provided with a slider, the insulating pull rod is provided with an insulating pull rod insert, and the insulating pull rod insert is provided with threads. The insulating pull rod insert passes through the central hole of the slider, and the insulating pull rod inserts on both sides of the slider are respectively provided with fixing nuts.

Both ends of the slider are respectively provided with a shaft head, and the outer end of the crank arm is provided with an oblong hole, and the shaft head is inserted into the oblong hole.

The slider is provided with a threaded hole for installing the mechanical characteristic detection equipment of the high voltage switch.

An elastic washer is arranged between the slider and the fixing nut on at least one side.

A guide plate is fixed on the side plate, and a guide hole is arranged on the guide plate, and the end of the insulating rod insert is inserted into the guide hole.

The novel high-voltage switch switching transmission device of the present invention solves the shortcomings of this type of high-voltage switch switching transmission device currently on the market, improves the breaking and closing capabilities of the high-voltage switch, and improves the service life of the vacuum interrupter , to reduce product cost to a certain extent.

Specific examples:

As shown in Figure 3a, Figure 3b, and Figure 3c, it includes: insulating pull rods, sliders, crank arms, main shafts, and guide plates. The technical content of specific embodiment is realized through the following measures:

Arm installation:

Install the crank arm and the shaft sleeve on the main shaft (the outline structure of the crank arm is shown in Figure 5), wherein the crank arm is positioned through the shaft sleeve, and the transmission is realized through the spline cooperation between the crank arm and the main shaft.

Slider installation:

Install the slider on the oblong hole of the crank arm, and fix it on the crank arm through the bushing (the shape and structure of the slider are shown in Figure 4a and Figure 4b).

Insulation rod installation:

Insert the insulating tie rod insert through the center hole of the slider and into the guide hole of the guide plate mounted on the side plate. During the installation process, nuts are installed on both sides of the slider, and an elastic washer is incorporated between the nut on the side close to the guide plate and the slider to adjust the overtravel and prevent loosening. This greatly reduces the space between the crank arm and the insulating tie rod, since only one space is reserved between the slider and the insulating tie rod for the fine-pitched thin nut.

Overtravel adjustment and detection:

When the overtravel needs to be adjusted, just adjust the nuts installed on both sides of the slide block with an external hexagonal wrench. When it is necessary to increase the overtravel, it is only necessary to loosen the nuts on both sides of the slider, then move the slider to a suitable position, and finally tighten the nuts on both sides. The size of the overtravel can be adjusted arbitrarily in this solution, which solves the problem in the prior art 1 that each overtravel can only be adjusted by an integral multiple of 0.5mm.

Two threaded holes are preset on one end of the slider, which are used to install the tooling for measuring the mechanical characteristics of the high-voltage switch. The parameters can be measured directly with a linear sensor, which solves the problem of converting values when using a rotary sensor.

Opening and closing drive of high voltage circuit breaker:

The opening and closing transmission of the high-voltage circuit breaker is to drive the insulating rod to make a linear motion through the crank arm on the main shaft, thereby driving the closing and opening of the vacuum interrupter in the high-voltage switch, and finally realizing the opening and closing operation of the high-voltage circuit breaker. In this scheme, the crank arm is used to push the slider, and the slider drives the insulating pull rod to move. Because the long round hole is used to cooperate between the crank arm and the slider, and the guide plate is designed at the rear end of the insulating rod, so the force on the slider during the movement is always the same as the axis of the insulating rod and the axis of the vacuum interrupter. line, so that the movement of the insulating rod is linear motion, and the insulating rod does not swing up and down and left and right during the whole movement process.

The external structure of core part crank arm and slide block in the concrete embodiment:

The positioning of the crank arm on the main shaft and the connection between the slider and the crank arm are realized through the shaft sleeve, and the transmission is realized through the spline cooperation between the crank arm and the main shaft. The crank arm can also be changed accordingly according to the structural form of the transmission main shaft. For example, when the main shaft is a hexagonal shaft, the crank arm and the main shaft can cooperate with the hexagonal shaft to realize transmission.

The crank arm is provided with an oblong hole matched with the slider, which is used to convert the circular motion of the crank arm into the linear motion of the slider.

The slider is provided with threaded holes for installing high-voltage switch mechanical characteristic testing equipment; in addition, the outer dimensions of the slider can also be changed according to the actual situation.

The cooperation and transmission mode of the crank arm and the slide block in the specific embodiment:

The axial positioning of the insulating pull rod is realized through the slider and the guide plate, and the rotational movement of the crank arm is converted into the linear motion of the insulating pull rod through the cooperation relationship between the slider and the crank arm.

The adjustment and detection method of overtravel in the specific embodiment:

The overtravel of the high-voltage switch is adjusted by adjusting the position of the nuts installed on both sides of the slider; the preset threaded hole on the slider provides an installation position for the mechanical characteristic test tool.

The beneficial effects brought by the technical solution of the present invention:

This solution solves some problems existing in the current high-voltage switch in the process of opening and closing transmission, including the damage of the vacuum interrupter caused by the left and right and up and down swings of the insulating rod during the transmission process; it solves the problem of vacuum arc extinguishing during the opening and closing of the high-voltage switch The problem of uneven force on the contact surface of the indoor dynamic and static contacts improves the breaking and closing capabilities of the high-voltage switch to a certain extent, and improves the service life of the vacuum interrupter;

The invention simplifies the adjustment scheme of the overtravel and improves the adjustment precision of the overtravel; optimizes the adjustment and measurement of the overtravel and the detection method of the mechanical characteristics.

The above is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person familiar with the technical field can easily conceive of changes or changes within the technical scope disclosed in the present invention. Replacement should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be determined by the protection scope of the claims.

Claims (5)

1. A new type of high-voltage switch switching transmission device, characterized in that it comprises a main shaft and an insulating pull rod, the main shaft is provided with a crank arm, the outer end of the crank arm is provided with a slider, and the insulating pull rod is provided with an insulating The pull rod insert is threaded, the insulating pull rod insert passes through the center hole of the slider, and the insulating pull rod inserts on both sides of the slider are respectively provided with fixing nuts. 2. The new high-voltage switch switching transmission device according to claim 1, characterized in that, the two ends of the slider are respectively provided with a shaft head, the outer end of the crank arm is provided with an oblong hole, and the shaft head Insert it into the oblong hole. 3. The novel high-voltage switch switching transmission device according to claim 2, characterized in that the slider is provided with threaded holes for installing high-voltage switch mechanical characteristic testing equipment. 4. The novel high-voltage switch on-off transmission device according to claim 3, characterized in that an elastic washer is provided between the slider and the fixing nut on at least one side. 5. According to any one of claims 1 to 4, the new high-voltage switch switching transmission device is characterized in that a guide plate is fixed on the side plate, and a guide hole is provided on the guide plate, and the insulating rod insert Insert the end into the guide hole.