CN104377095A - Switch-on transmission mechanism and operating mechanism applying same and breaker applying same - Google Patents

Abstract

The invention discloses a closing transmission mechanism and an operating mechanism using the transmission mechanism and a circuit breaker. The closing transmission mechanism includes a toggle lever and a force transmission block for being fixed with the corresponding moving contact. The force transmission block It is located under the toggle lever and the force transmission block is provided with a load-bearing shoulder facing the toggle lever. Pushing the force transmission block drives the movable contact to move toward the static contact, and the opening of the closing gate faces the notch downward, and the right end of the toggle lever is provided with a hinged structure for hinged connection with the power output shaft of the corresponding operating mechanism. When the closing transmission mechanism of the present invention needs to be tripped, since the notch and the load-bearing shoulder of the force transmission block are push fit, it is only necessary to apply an upward force to the toggle lever to turn the toggle lever upward The notch is separated from the load-bearing shoulder of the force-transmitting block, which is convenient for tripping, and the notch is directly arranged on the toggle lever, and the load-bearing shoulder is arranged on the force-transmitting block, which has a simple structure and is convenient for disassembly and maintenance.

Description

Closing transmission mechanism and operating mechanism and circuit breaker using the transmission mechanism

technical field

The invention relates to the technical field of medium and low voltage switches, in particular to a closing transmission mechanism, an operating mechanism and a circuit breaker using the transmission mechanism.

Background technique

Due to the unique advantages of DC power supply, many important industries such as urban rail transit, mining, metallurgy, and ship power in my country have adopted DC power supply systems. The circuit breaker is the most important protection device in the DC power supply system. With the continuous improvement of the living standards of Chinese residents and the development of power supply modernization, higher requirements are put forward for the reliability of the operation of the circuit breaker.

At present, the operating mechanisms widely used in circuit breakers include return spring operating mechanisms and electromagnetic operating mechanisms. The return spring operating mechanisms have many parts, complex structures, low reliability and service life, so the application of electromagnetic operating mechanisms is more widely. There is a closing transmission mechanism between the output shaft of the electromagnetic operating mechanism and the moving contact, but the current closing transmission mechanism often has the problems of complex structure and inconvenient tripping, and when the circuit breaker operates too frequently, it will There is a phenomenon that the action is not reliable enough.

Contents of the invention

The purpose of the present invention is to provide a closing transmission mechanism with convenient tripping. At the same time, the invention also provides an operating mechanism and a circuit breaker using the closing transmission mechanism.

In order to achieve the above object, the closing transmission mechanism of the present invention adopts the following technical scheme: the closing transmission mechanism includes a toggle lever and a force transmission block for being fixed with the corresponding moving contact, and the force transmission block is located at the Below the toggle lever and on the force transmission block, there is a load-bearing shoulder facing the toggle lever, and the toggle lever is provided with a force-bearing shoulder that is used to push and cooperate with the force transmission block to move When the rod moves to the left, push the force transmission block to drive the movable contact towards the static contact and close the notch with the opening facing downward. The right end of the toggle rod is provided with a power output for the corresponding operating mechanism Shaft hinged hinged structure. the

The force transmission block includes front and rear force transmission block parts correspondingly arranged on the front and rear sides of the moving contact, and the toggle lever includes front and rear force transmission block parts correspondingly arranged Front and rear toggle lever sections.

The closing transmission mechanism also includes an insulating mounting seat fixed under the fixed contact, and a return spring for driving the toggle lever to turn downwards is provided under the insulating mounting seat and is passed through the The guide rod used to guide the return spring in the return spring, the lower end of the return spring is also provided with a force transmission plate, and the force transmission plate slides and presses on the upper side of the front and rear toggle rod parts.

The space between the front and rear toggle rod parts forms an avoidance space for avoiding the guide rod.

The operating mechanism of the present invention adopts the following technical scheme: the operating mechanism includes a power output shaft and a closing transmission mechanism, and the closing transmission mechanism includes a toggle lever and a force transmission mechanism for fixing with the corresponding moving contact. block, the force transmission block is located below the toggle rod and the force transmission block is provided with a load-bearing shoulder facing the toggle rod, and the toggle rod is provided with a bearing for connecting with the force transmission block The force shoulder pushes and fits to push the force transmission block when the toggle lever moves to the left to drive the movable contact toward the static contact and close the notch with the opening facing downward, and the toggle lever passes through the notch at the right end The hinged structure is hinged with the power output shaft.

The force transmission block includes front and rear force transmission block parts correspondingly arranged on the front and rear sides of the moving contact, and the toggle lever includes front and rear force transmission block parts correspondingly arranged Front and rear toggle lever sections.

The closing transmission mechanism also includes an insulating mounting seat fixed under the fixed contact, and a return spring for driving the toggle lever to turn downwards is provided under the insulating mounting seat and is passed through the The guide rod used to guide the return spring in the return spring, the lower end of the return spring is also provided with a force transmission plate, and the force transmission plate slides and presses on the upper side of the front and rear toggle rod parts.

The circuit breaker of the present invention adopts the following technical scheme: the circuit breaker includes a static contact and an operating mechanism, the operating mechanism includes a power output shaft and a closing transmission mechanism, and the circuit breaker also includes a force applying device and a rotation completion and the static contact The moving contact of the opening and closing action of the contact. The closing transmission mechanism includes a toggle lever and a force transmission block located below the toggle lever. The force transmission block is fixed with the moving contact. , the force transmission block is provided with a load-bearing shoulder facing the toggle lever, and the toggle lever is provided with a push fit with the force-bearing shoulder of the force transmission block to push the toggle lever toward the When moving to the left, push the force transmission block to drive the movable contact towards the static contact and close the notch with the opening facing downward, the toggle lever is hinged with the power output shaft through the hinged structure at its right end, The force transmitting block is released from the notch under the upward force exerted by the force applying device on the toggle lever.

The force transmission block includes front and rear force transmission block parts correspondingly arranged on the front and rear sides of the moving contact, and the toggle lever includes front and rear force transmission block parts correspondingly arranged Front and rear toggle lever sections.

The closing transmission mechanism also includes an insulating mounting seat fixed under the fixed contact, and a return spring for driving the toggle lever to turn downwards is provided under the insulating mounting seat and is passed through the The guide rod used to guide the return spring in the return spring, the lower end of the return spring is also provided with a force transmission plate, and the force transmission plate slides and presses on the upper side of the front and rear toggle rod parts.

The closing transmission mechanism of the present invention includes a toggle lever and a force transmission block for being fixedly arranged with the corresponding moving contact, the force transmission block is provided with a load bearing shoulder facing the toggle lever, and the toggle lever is provided with There is a notch for pushing and cooperating with the load-bearing shoulder of the force transmission block, so that when the toggle lever moves to the left, the force transmission block is pushed to drive the moving contact towards the static contact, and the closing opening faces downward. The toggle lever The right end of the right end is provided with a hinge structure for hinged connection with the corresponding power output shaft, so that when the power output shaft moves, the toggle lever is pushed to move to the left, and the toggle lever is pushed through the notch and the load-bearing shoulder of the force transmission block. Cooperate with driving the force transmission block and the moving contact to rotate around the rotating shaft of the moving contact to complete the closing action. When tripping is required, since the notch and the load-bearing shoulder of the force transmission block are push-fit, you only need to apply an upward force to the toggle lever and turn the toggle lever upward around the pin axis to align the notch with the load-bearing shoulder. The load-bearing shoulder of the force transmission block is detached, the operation is simple, and the trip is convenient. And because the notch is directly set on the toggle lever and the load-bearing shoulder is set on the force transmission block, the structure is simple, there are few parts, and it is easy to disassemble. and maintenance.

Further, the closing transmission mechanism of the present invention also includes an insulating mounting seat fixed under the static contact, so that after the installation is completed, the insulating mounting seat can insulate and isolate the static contact from the closing mechanism to prevent misoperation, Improve the reliability of the operation of the closing transmission mechanism. A reset spring is provided under the insulating mounting seat of the present invention, and the toggle rod is driven to turn downward by the reset spring, which has a simple structure and is conducive to reducing the processing cost. In this way, when the power output shaft pushes the toggle lever to move, the return spring will not be skewed when the friction force of the toggle lever moves with the movement of the toggle lever due to the radial constraint force of the guide rod. On the one hand, the return spring Only the spring force of turning downwards can be applied to the toggle lever, which ensures that the toggle lever can be reliably reset after each trip. In addition, the lower end of the return spring of the present invention is also provided with a force transmission plate, and the force transmission plate presses on the upper side of the front and rear toggle lever parts, so that the force transmission plate can transfer the spring force of the return spring to the front and rear in a balanced manner. The rear toggling rod part prevents the toggling rod from being skewed due to force on one side.

Description of drawings

Fig. 1 is a schematic structural view of an embodiment of the circuit breaker of the present invention (remove the insulating mount, etc.);

Fig. 2 is a schematic diagram of the installation structure of the dynamic and static contacts and the closing transmission mechanism in Fig. 1;

Fig. 3 is a schematic diagram of the installation of the toggle lever and the hinge seat in Fig. 1 .

Detailed ways

The circuit breaker shown in Figure 1-3 includes a static contact 5, a moving contact 4, a force applying device and an operating mechanism. Brake or closing action, the above-mentioned operating mechanism includes a power output shaft, a closing transmission mechanism and an opening mechanism, the static contact 5 is located on the left side of the moving contact 4, and the above-mentioned power output shaft is connected to the closing transmission mechanism .

The above-mentioned closing transmission mechanism includes a force transmission block and a toggle lever extending in the left and right directions. The right end of the toggle lever is provided with a hinged structure for hinged connection with the power output shaft. In this embodiment, the hinged structure includes epoxy resin. The hinged seat 2 made by pouring is hinged with the power output shaft through the pin shaft 10. Since the hinged seat 2 is manufactured by casting, it will not cause deformation of the toggle rod during processing and manufacturing, ensuring The matching accuracy of the notch of the toggle rod and the load-bearing shoulder of the force transmission block is not affected. Certainly, in other embodiments, the above-mentioned hinged structure may also be a hinged pipe welded on the right end of the toggle lever and extending in the front-back direction, and the size of the notch is corrected after the welding is completed.

The above-mentioned force transmission block is fixedly installed on the movable contact 4 and is located below the above-mentioned toggle lever. The aforementioned load-bearing shoulder push-fits the notch. In this embodiment, the contact depth between the load-bearing shoulder of the above-mentioned force transmission block and the notch of the toggle lever is set at about 1mm, so that the toggle lever can overcome a smaller force under the upward force of the force applying device. The resistance can rotate around the pivot pin 10, thereby disengaging from the force transmission block to realize tripping. Of course, in other embodiments, the contact depth between the load-bearing shoulder and the notch can also be set according to the site conditions of the place of use.

In order to improve the reliability of the pushing fit between the notch of the toggle lever and the load-bearing shoulder of the force transmission block, and to ensure that the driving force of the toggle lever to the moving contact 4 is balanced, the above-mentioned force transmission block includes a front transmission force block part 9 and the rear force transmission block part, the front transmission force block part is fixed on the front side of the movable contact 4, and the rear force transmission block part is fixed on the rear side of the movable contact 4. The above-mentioned toggle lever includes a front toggle lever Part 1 and the rear toggling lever part 12, the above-mentioned front and rear toggling lever parts are all provided with notches, the above-mentioned front and rear force transmission parts are all provided with load-bearing shoulders, and the force-bearing part of the above-mentioned front transmission force block part The shoulder pushes and cooperates with the notch of the front toggling lever part, and the load-bearing shoulder of the rear force transmission block part pushes and cooperates with the notch of the rear toggling lever part.

The bottom of the above-mentioned static contact 5 is fixed with an insulating mounting seat 3, the upper side of the insulating mounting seat 3 is fixed with the lower end of the static contact 5, and the bottom of the insulating mounting 3 is provided with a return spring and is threaded on the return spring. Inside the guide rod 7 that guides the return spring, the return spring 6 applies a downward force to the toggle lever to drive the toggle lever to turn down until the load-bearing shoulder of the force transmission block is re-set in the notch. The lower end of back-moving spring 6 is also provided with force transmission plate 8, and force transmission plate 8 slides and presses on the upper side of above-mentioned front and rear toggling lever part, and back-moving spring 6 applies downward force to the toggling lever through force transmission plate 8. The active force drives the toggle lever to flip down. The space between the above-mentioned front and rear toggle rod parts forms an avoidance space for avoiding the above-mentioned guide rod.

In order to facilitate production and processing, it is unnecessary to add additional positioning tooling to ensure that the front and rear toggling rods are always set in parallel and the upper sides of the front and rear toggling rods are in the same plane during pouring. 1. The rear toggle lever part is made of integral molding. The toggle lever is a U-shaped structure. The two protruding ends of the U shape form the above-mentioned front and rear toggle lever parts. The opening of the U shape faces the left end, and the left end of the U shape The opening forms the above-mentioned avoidance space, and the guide rod 7 extends into the above-mentioned avoidance space after passing through the force transmission plate 8 .

The shape of the above-mentioned force transmission block is U-shaped, and the two protruding ends of the U-shape form the above-mentioned front and rear force transmission block parts, and the above-mentioned moving contact 4 is installed in the inner cavity of the U-shape. The above-mentioned insulating mounting base 3 is also provided with a long hole corresponding to the U-shaped inner cavity of the toggle rod for the moving contact 4 to pass through. After the installation is completed, the moving contact 4 can rotate in the long hole. Of course, in other embodiments, the above-mentioned toggle lever and force transmission block can also adopt a straight structure, and the above-mentioned insulating mounting seat can also cancel the long hole for the moving contact to rotate. When installing, the toggle lever, transmission block Both the force block and the insulating mounting seat can be arranged on the same side of the moving contact.

In this embodiment, the above-mentioned opening mechanism includes a compression spring located on the right side of the above-mentioned moving contact, and the compression spring pushes and cooperates with the above-mentioned moving contact. The moving contact realizes rapid opening under the spring force of the compression spring.

The above-mentioned force application device includes an indirect release 13, the indirect release is an electromagnetic structure, when the coil is energized, the electromagnet pulls in and pushes the insulating push rod 14, and the insulating push rod 14 drives the rotating rod 16 to rotate through the crank arm 15, Thereby make the top block 17 that is fixed on the rotating rod 16 upwards push the toggle lever, and the notch of the toggle lever is disengaged from the load-bearing shoulder of the force transmission block. Certainly, in other embodiments, the above-mentioned force applying device may also be an overcurrent release.

The structure of the closing transmission mechanism of the present invention is consistent with that of the above-mentioned closing transmission mechanism, and will not be repeated here. Because the closing transmission mechanism of the present invention has simple structure, fewer components, stable and reliable action, and is easy to trip, it is very suitable for DC circuit breakers.

The structure of the operating mechanism of the present invention is consistent with that of the above-mentioned operating mechanism, and will not be repeated here.

The working principle of the present invention: the power output shaft pushes the toggle lever to move to the left, and the toggle lever pushes through the notch on the toggle lever to push and cooperate with the load-bearing shoulder of the force transmission block to drive the force transmission block and the movable contact 4 to rotate The rotating shaft 11 of the movable contact 4 rotates counterclockwise, and the movable contact 4 contacts with the static contact 5 to complete the closing action. When the opening of the dynamic and static contacts is required, the above-mentioned force applying device applies an upward force to the left end of the toggle lever, and the toggle lever turns upwards around the pin shaft 10 under the upward force, and the notch and transmission The load-bearing shoulder of the force block is disengaged, and the toggle lever releases the restriction to the movable contact 4 to realize tripping, and the movable contact 4 rotates clockwise under the spring force of the compression spring of the opening mechanism to complete the opening action. When the load-bearing shoulder of the force transmission block and the notch need to be clamped together again, the upward force of the force applying device on the toggle lever is cancelled, and the left end of the toggle lever is pressed against the downward spring force of the back-moving spring 6. Flip down under action until the load-bearing shoulder of the force-transmitting block is locked in the notch again.

Claims (10)

1. closing transmission mechanism, it is characterized in that: comprise poke rod and the force-transmitting block for being solid-located with corresponding moving contact, force-transmitting block is positioned at below described poke rod and force-transmitting block is provided with towards the load shoulder of described poke rod, described poke rod is provided with for coordinating with the load shoulder pushing tow of described force-transmitting block the downward opening recess closed a floodgate to promote described force-transmitting block to drive moving contact to move towards fixed contact when poke rod is moved to the left, and the right-hand member of described poke rod is provided with for the articulated structure hinged with the power output shaft of corresponding operating mechanism.

2. closing transmission mechanism according to claim 1, it is characterized in that: described force-transmitting block comprises the forward and backward force-transmitting block part be arranged on for correspondence on the forward and backward side of described moving contact, and described poke rod comprises the forward and backward poke rod part that arrange corresponding to described forward and backward force-transmitting block part.

3. closing transmission mechanism according to claim 2, it is characterized in that: described closing transmission mechanism also comprises the insulating mounting seat of the below being installed in described fixed contact, the guide post for leading to back-moving spring that the below of insulating mounting seat is provided with the back-moving spring for driving described poke rod to overturn downwards and is located in described back-moving spring, described back-moving spring lower end is also provided with force transmitting board, and force transmitting board slides to push up and is pressed on the upper side of described forward and backward poke rod part.

4. closing transmission mechanism according to claim 3, is characterized in that: the space between described forward and backward poke rod part defines dodges space for what dodge described guide post.

5. operating mechanism, comprise power output shaft and closing transmission mechanism, it is characterized in that: described closing transmission mechanism comprises poke rod and the force-transmitting block for being solid-located with corresponding moving contact, described force-transmitting block is positioned at below described poke rod and force-transmitting block is provided with towards the load shoulder of described poke rod, described poke rod is provided with for coordinating with the load shoulder pushing tow of described force-transmitting block the downward opening recess closed a floodgate to promote described force-transmitting block to drive moving contact to move towards fixed contact when poke rod is moved to the left, described poke rod by the articulated structure of its right-hand member and described power output shaft hinged.

6. operating mechanism according to claim 5, it is characterized in that: described force-transmitting block comprises the forward and backward force-transmitting block part be arranged on for correspondence on the forward and backward side of described moving contact, and described poke rod comprises the forward and backward poke rod part that arrange corresponding to described forward and backward force-transmitting block part.

7. operating mechanism according to claim 6, it is characterized in that: described closing transmission mechanism also comprises the insulating mounting seat of the below being installed in described fixed contact, the guide post for leading to back-moving spring that the below of insulating mounting seat is provided with the back-moving spring for driving described poke rod to overturn downwards and is located in described back-moving spring, described back-moving spring lower end is also provided with force transmitting board, and force transmitting board slides to push up and is pressed on the upper side of described forward and backward poke rod part.

8. circuit breaker, comprise fixed contact and operating mechanism, operating mechanism comprises power output shaft and closing transmission mechanism, it is characterized in that: described circuit breaker also comprises force application apparatus and rotation to be completed and divide with described fixed contact, the moving contact of feed motion, described closing transmission mechanism comprises poke rod and is positioned at the force-transmitting block below described poke rod, described force-transmitting block and described moving contact are solid-located, described force-transmitting block is provided with the load shoulder towards described poke rod, described poke rod is provided with for coordinating with the load shoulder pushing tow of described force-transmitting block the downward opening recess closed a floodgate to promote described force-transmitting block to drive moving contact to move towards fixed contact when poke rod is moved to the left, described poke rod by the articulated structure of its right-hand member and described power output shaft hinged, described force-transmitting block is deviate under the force effect upwards of described force application apparatus to described poke rod in described recess.

9. circuit breaker according to claim 8, it is characterized in that: described force-transmitting block comprises the forward and backward force-transmitting block part be arranged on for correspondence on the forward and backward side of described moving contact, and described poke rod comprises the forward and backward poke rod part that arrange corresponding to described forward and backward force-transmitting block part.

10. circuit breaker according to claim 9, it is characterized in that: described closing transmission mechanism also comprises the insulating mounting seat of the below being installed in described fixed contact, the guide post for leading to back-moving spring that the below of insulating mounting seat is provided with the back-moving spring for driving described poke rod to overturn downwards and is located in described back-moving spring, described back-moving spring lower end is also provided with force transmitting board, and force transmitting board slides to push up and is pressed on the upper side of described forward and backward poke rod part.