Circuit breaker operating mechanism and circuit breaker thereof

Abstract

The invention discloses a circuit breaker operating mechanism and a circuit breaker thereof, the operating mechanism comprises a handle, a movable contact piece, a lock catch piece, a lock catch spring and a contact spring, and at the beginning, the limiting surface of the movable contact piece is contacted with a limiting stop block on a shell to enable the operating mechanism to be in an opening state; an operating handle pushes the U-shaped rod, one end of the U-shaped rod is simultaneously contacted with a first rod contact surface of the movable contact piece and a second rod contact surface of the lock catch piece, and the movable contact piece rotates clockwise around the opening and closing rotating shaft under the pushing of the U-shaped rod until a movable contact of the movable contact piece is contacted with a static contact on the shell, so that the opening and closing of the shell is realized. And the operating mechanism is in a closed state. The operating mechanism has the advantages of being simple in structure, low in cost and high in opening speed.

Description

Technical Field

[0001] The present application relates to the technical field of circuit breakers, and in particular to a circuit breaker operating mechanism and a circuit breaker thereof. Background Art

[0002] A circuit breaker is a switch device that can close, carry and interrupt the current under normal circuit conditions, and can close, carry and interrupt the current under abnormal circuit conditions within a specified time. Circuit breakers are divided into high-voltage circuit breakers and low-voltage circuit breakers according to their scope of use. The boundary between high and low voltage is relatively vague, and those above 3kV are generally called high-voltage electrical appliances.

[0003] Circuit breakers can be used to distribute electric energy, start asynchronous motors infrequently, and protect power lines and motors. When they are seriously overloaded or short-circuited or undervoltage, they can automatically cut off the circuit. Their function is equivalent to the combination of fuse switches and overheating relays. Moreover, there is generally no need to change parts after breaking the fault current; they have been widely used.

[0004] The circuit breaker is generally composed of contacts, arc extinguishing system, operating mechanism, protection device (various releases, bimetallic strips), shell, etc. When short-circuited, the magnetic field generated by the large current (generally 10 to 12 times) overcomes the reaction spring, the release pulls the operating mechanism to operate, and the switch trips instantly. When overloaded, the current becomes larger, the heat generation intensifies, and the bimetallic strip deforms to a certain extent to promote the mechanism to operate (the larger the current, the shorter the operation time). Specifically, the main contacts of the circuit breaker are closed manually or electrically. After the main contacts are closed, the free tripping mechanism locks the main contacts in the closed position. The coil of the overcurrent release and the thermal element of the thermal release are connected in series with the main circuit, and the coil of the undervoltage release is connected in parallel with the power supply. When the circuit is short-circuited or severely overloaded, the armature of the overcurrent release is attracted, the free tripping mechanism is operated, and the main contact disconnects the main circuit. When the circuit is overloaded, the thermal element of the thermal release heats up and bends the bimetallic strip, pushing the free tripping mechanism to operate. When the circuit is undervoltage, the armature of the undervoltage release is released, and the free tripping mechanism is also activated. The shunt release is used for remote control. In normal operation, its coil is de-energized. When distance control is required, press the start button to energize the coil. Summary of the invention

[0005] The main purpose of the present invention is to provide a circuit breaker operating mechanism and a circuit breaker thereof, aiming to solve the technical problems of the existing circuit breaker operating mechanism having a complex structure and a slow reaction speed.

[0006] In order to solve the above technical problems, the first aspect of the present invention provides a circuit breaker operating mechanism, comprising: a handle, a movable contact piece, a locking piece, a locking spring and a contact spring, wherein the movable contact piece and the locking piece are connected by an opening and closing rotating shaft after being attached to each other and rotate around the shaft respectively, a V-shaped activity area is formed between the locking piece and the movable contact piece, the handle is connected to the opening and closing switching slot hole on the movable contact piece through a U-shaped rod, and the opening and closing switching slot hole is located in the V-shaped activity area; one end of the locking spring is connected to the locking piece, and the other end is connected to the handle; one end of the contact spring is connected to the movable contact piece, and the other end is fixed to the housing;

[0007] Initially, the limit surface of the moving contact piece contacts the limit block on the shell, so that the operating mechanism is in an open state; the operating handle pushes the U-shaped rod, and one end of the U-shaped rod simultaneously contacts the first rod contact surface of the moving contact piece and the second rod contact surface of the locking piece. Under the push of the U-shaped rod, the moving contact piece rotates clockwise around the opening and closing shaft until the moving contact point of the moving contact piece contacts the static contact point on the shell, so that the operating mechanism is in a closed state.

[0008] Furthermore, the handle is arranged on the handle seat axis of the shell through a handle axis hole, and the handle is located in the opening portion of the shell.

[0009] Furthermore, one end of the lock spring is arranged on the lock boss of the handle, and the other end is arranged on the lock spring hanging hole of the lock plate.

[0010] Furthermore, one end of the contact spring is arranged on the spring hanging terminal of the housing, and the other end is arranged on the contact spring hanging hole of the moving contact piece.

[0011] Furthermore, the opening and closing shaft is sequentially penetrated by the rotating seat hole of the locking piece and the long slot hole of the moving contact piece; as the U-shaped rod continues to push, the opening and closing shaft slides in the long slot hole, and at the same time, under the pulling force of the contact spring, the moving contact of the moving contact piece is always in contact and interacting with the static contact on the shell.

[0012] Furthermore, the first rod contact surface is provided at one end of the opening and closing switching slot, and a yield groove is provided at the other end; the release pushing part on the locking plate is pushed to make the locking plate rotate counterclockwise, and one end of the U-shaped rod slides from the first rod contact surface to the yield groove, and the moving contact piece rotates counterclockwise around the opening and closing shaft under the pulling force of the contact spring, so that the moving contact is separated from the static contact and reset to the open state.

[0013] Furthermore, an assembling shaft connecting hole is also provided on the locking plate, and the assembling shaft connecting hole is located on one side of the rotating seat hole, and the assembling shaft connecting hole is used for installing a linkage shaft for multi-pole opening linkage.

[0014] Based on the same inventive concept, another aspect of the present invention provides a circuit breaker, wherein the circuit breaker is provided with the above-mentioned operating mechanism in a housing.

[0015] Beneficial effects of the technical solution of the present invention:

[0016] The circuit breaker operating mechanism and the circuit breaker thereof of the embodiment of the present invention include a handle, a movable contact piece, a locking piece, a locking spring and a contact spring. Initially, the limit surface of the movable contact piece contacts the limit block on the housing so that the operating mechanism is in an open state; the operating handle pushes the U-shaped rod, and one end of the U-shaped rod contacts the first rod contact surface of the movable contact piece and the second rod contact surface of the locking piece at the same time. Under the push of the U-shaped rod, the movable contact piece rotates clockwise around the opening and closing shaft until the movable contact of the movable contact piece contacts the static contact on the housing, so that the operating mechanism is in a closed state. The operating mechanism of the present invention has the advantages of simple structure, low cost and fast opening speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings.

[0018] Figure 1 Schematic diagram of the circuit breaker operating mechanism in the embodiment of the present invention in the open state Figure 1 ;

[0019] Figure 2 Schematic diagram of the circuit breaker operating mechanism in the embodiment of the present invention in the open state Figure 2 ;

[0020] Figure 3 Schematic diagram of the closing state of the circuit breaker operating mechanism according to an embodiment of the present invention Figure 1 ;;

[0021] Figure 4 Schematic diagram of the closing state of the circuit breaker operating mechanism according to an embodiment of the present invention Figure 2 ;;

[0022] Figure 5 Schematic diagram of the circuit breaker operating mechanism according to an embodiment of the present invention (without the U-shaped rod);

[0023] Figure 6 This is a schematic diagram of the handle structure of an embodiment of the present invention;

[0024] Figure 7 The structure of the movable contact piece of the embodiment of the present invention is schematically shown in FIG. Figure 1 ;

[0025] Figure 8 The structure of the movable contact piece of the embodiment of the present invention is shown in FIG. Figure 2 ;

[0026] Fig. 9 The structure of the locking piece of the embodiment of the present invention is schematically shown in FIG. Figure 1 ;

[0027] Fig.10 The structure of the locking piece of the embodiment of the present invention is schematically shown in FIG. Figure 2 ;

[0028] Fig.11 This is a schematic diagram of the structure of a circuit breaker in an open state according to an embodiment of the present invention;

[0029] Fig.12 This is a schematic diagram of the structure of a circuit breaker in a closed state according to an embodiment of the present invention;

[0030] Description of reference numerals: 10 - circuit breaker operating mechanism, 110 - handle, 111 - buckle boss, 112 - handle shaft hole, 120 - U-shaped rod, 130 - moving contact piece, 140 - locking piece, 150 - opening and closing shaft, 160 - locking spring, 170 - contact spring;

[0031] 131-opening and closing switching slot hole, 1311-dispatch slot, 1312-first rod contact surface, 132-long slot hole, 133-contact spring hanging hole, 134-limiting surface, 135-moving contact point, 136-contact surface;

[0032] 141 - rotating seat hole, 142 - second rod contact surface, 143 - locking spring hanging hole, 144 - release push part, 145 - assembly shaft connection hole;

[0033] 20-housing, 201-static contact, 202-spring terminal, 203-handle seat shaft, 204-opening, 205-limit stopper. DETAILED DESCRIPTION

[0034] It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not used to limit the present invention.

[0035] Example 1

[0036] like Figure 1-5As shown in , 11-12, an embodiment of the present invention provides a circuit breaker operating mechanism 10, comprising: a handle 110, a movable contact piece 130, a locking piece 140, a locking spring 160 and a contact spring 170, wherein the movable contact piece 130 and the locking piece 140 are connected by an opening and closing rotating shaft 150 after being attached to each other and rotate around the shaft respectively, and a V-shaped activity area is formed between the locking piece 140 and the movable contact piece 30, the handle 110 is connected to the opening and closing switching slot hole 131 on the movable contact piece 130 through a U-shaped rod 120, and the opening and closing switching slot hole 131 is located in the V-shaped activity area; one end of the locking spring 160 is connected to the locking piece 140, and the other end is connected to the handle 110; one end of the contact spring 170 is connected to the movable contact piece 130, and the other end is fixed to the housing 20;

[0037] Initially, the limit surface 134 of the movable contact piece 130 contacts the limit stopper 205 on the housing 20, so that the operating mechanism 10 is in the open state; the operating handle 110 pushes the U-shaped rod 120, and one end of the U-shaped rod 120 contacts the first rod contact surface 1312 of the movable contact piece 130 and the second rod contact surface 142 of the locking piece 140 at the same time. Under the push of the U-shaped rod 120, the movable contact piece 130 rotates clockwise around the opening and closing shaft 150 until the movable contact point 135 of the movable contact piece 130 contacts the static contact point 201 on the housing 20, so that the operating mechanism 10 is in the closed state. Figure 6 As shown, the handle 110 is disposed on the handle seat axis 203 of the housing 20 through a handle axis hole 112 , and the handle 110 is located in the opening portion 204 on the housing 20 .

[0038] like Figure 9-10 As shown, one end of the lock spring 160 is arranged on the hook boss 111 of the handle 110 , and the other end is arranged in the lock spring hanging hole 143 of the lock piece 140 .

[0039] like Figure 7-8 As shown in 11-12, one end of the contact spring 170 is arranged on the spring terminal 202 of the housing 20, and the other end is arranged on the contact spring hanging hole 133 of the moving contact piece 130.

[0040] like Figure 1-4 As shown, the opening and closing shaft 150 is sequentially penetrated by the rotating seat hole 141 of the locking piece 140 and the long slot hole 132 of the moving contact piece 130; as the U-shaped rod 120 continues to push, the opening and closing shaft 150 slides in the long slot hole 132, and at the same time, under the pulling force of the contact spring 170, the moving contact 135 of the moving contact piece 130 is always in contact and interacting with the static contact 201 on the shell 20.

[0041] like Figure 1-4 As shown, the first rod contact surface 1312 is provided at one end of the opening and closing switching slot 131, and a yielding groove 1311 is provided at the other end; the release pushing portion 144 on the locking piece 140 is pushed to make the locking piece 140 rotate counterclockwise, and one end of the U-shaped rod 120 slides from the first rod contact surface 1312 to the yielding groove 1311, and the moving contact piece 130 rotates counterclockwise around the opening and closing shaft 150 under the pulling force of the contact spring 170, so that the moving contact 135 is separated from the static contact 201 and reset to the open state.

[0042] like Figure 3-4 As shown, the locking piece 140 is also provided with an assembling shaft connecting hole 145 , and the assembling shaft connecting hole 145 is located at one side of the rotating seat hole 141 , and the assembling shaft connecting hole 145 enables the locking piece 140 to be rotatably disposed in the housing 20 .

[0043] The embodiment of the present invention further provides a circuit breaker, wherein the circuit breaker is provided with the above-mentioned operating mechanism 10 in a housing 20 .

[0044] Specifically, the opening and closing shaft 150 passes through the long slot hole 132 of the moving contact piece 130 and the rotating seat hole 141 of the locking piece 140. The moving contact piece 130 and the locking piece 40 can rotate around the opening and closing shaft 150 respectively, and the opening and closing shaft 150 is installed on the corresponding hole of the shell 20; the handle 110 is installed on the handle seat shaft 203 of the shell 20 and can rotate around the center of the circle; one end of the U-shaped rod 120 is connected with the handle 110, and the other end is inserted into the V-shaped active area formed by the moving contact piece 130 and the locking piece 140; one end of the locking spring 160 is hung on the locking spring hanging hole 143 of the locking piece 140, and the other end is hung on the hanging boss 111 of the handle 110; one end of the contact spring 170 is hung on the contact spring hanging hole 133 of the moving contact piece 130, and the other end is hung on the hanging spring terminal 202 of the shell 20. At this time, the operating mechanism 10 is in the open state, and the limit surface 134 of the movable contact piece 130 contacts the limit stopper 205 on the housing 20, ensuring that the movable contact piece 130 stops at the set position when the operating mechanism 10 is open.

[0045] The working principle is as follows: the handle 110 is pushed manually or electrically, and the handle 110 pushes the U-shaped rod 120 to move. One end of the U-shaped rod 120 contacts the first rod contact surface 1312 of the movable contact piece 130 and the second rod contact surface 142 of the lock piece 140 at the same time. At this time, the operating mechanism 10 forms a four-bar structure. Under the push of the U-shaped rod 120, the movable contact piece 130 rotates clockwise around the opening and closing shaft 150 until the movable contact point 130 contacts the static contact point 201. Since the operating mechanism 10 has an overtravel, after the movable contact point 135 contacts the static contact point 201, the movable contact piece 130 needs to continue to move. Therefore, the position of the long slot hole 132 of the movable contact piece 130 and the opening and closing shaft 150 changes. At the same time, under the pulling force of the contact spring 170, the movable contact point 135 is always in contact with the static contact point 201 and maintains a certain pressure. During the closing process, the main function of the lock spring 160 is to make the lock piece 140 always have a certain clockwise torque to maintain the relative position with the moving contact piece 130 unchanged. (Closing) The tripper push rod pushes the release push surface 144 on the lock piece 140, generating a counterclockwise torque greater than the clockwise torque generated by the lock spring 160 and the U-shaped rod 120 on the second rod contact surface 142 of the lock piece 140. When the lock piece 140 rotates counterclockwise to a certain angle, the U-shaped rod 120 escapes from the V-shaped active area and slides toward the clearance groove 1311 of the moving contact piece 130. Under the pulling force of the contact spring 170, the moving contact piece 30 rotates counterclockwise around the opening and closing shaft 150, and the moving contact 135 separates from the static contact 201 and returns to the opening position. Under the action of the tripper top rod, the lock piece 140 continues to rotate until the release pusher 144 of the lock piece 140 contacts the contact surface 136 of the moving contact piece 130. At this time, the moving contact piece 130 can be opened more quickly under the combined action of the push force of the lock piece 140 and the tension of the contact spring 170. At the same time, the handle 110 rotates counterclockwise under the tension of the lock spring 160 and returns to the open position. The assembly shaft connection hole 145 on the lock piece 140 is used to install the linkage shaft for multi-pole opening linkage.

[0046] (Open gate)

[0047] The circuit breaker operating mechanism and the circuit breaker thereof of the embodiment of the present invention include a handle, a movable contact piece, a locking piece, a locking spring and a contact spring. Initially, the limit surface of the movable contact piece contacts the limit block on the housing so that the operating mechanism is in an open state; the operating handle pushes the U-shaped rod, and one end of the U-shaped rod contacts the first rod contact surface of the movable contact piece and the second rod contact surface of the locking piece at the same time. Under the push of the U-shaped rod, the movable contact piece rotates clockwise around the opening and closing shaft until the movable contact of the movable contact piece contacts the static contact on the housing, so that the operating mechanism is in a closed state. The operating mechanism of the present invention has the advantages of simple structure, low cost and fast opening speed.

[0048] The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A circuit breaker operating mechanism, characterized in that: include: A handle, a movable contact piece, a locking piece, a locking spring and a contact spring, wherein the movable contact piece and the locking piece are connected by an opening and closing rotating shaft after being attached to each other and rotate around the shaft respectively, a V-shaped activity area is formed between the locking piece and the movable contact piece, the handle is connected to the opening and closing switching slot hole on the movable contact piece through a U-shaped rod, and the opening and closing switching slot hole is located in the V-shaped activity area; one end of the locking spring is connected to the locking piece, and the other end is connected to the handle; one end of the contact spring is connected to the movable contact piece, and the other end is fixed to the housing; Initially, the limit surface of the moving contact piece contacts the limit block on the shell, so that the operating mechanism is in an open state; the operating handle pushes the U-shaped rod, and one end of the U-shaped rod simultaneously contacts the first rod contact surface of the moving contact piece and the second rod contact surface of the locking piece. Under the push of the U-shaped rod, the moving contact piece rotates clockwise around the opening and closing shaft until the moving contact point of the moving contact piece contacts the static contact point on the shell, so that the operating mechanism is in a closed state.

2. The circuit breaker operating mechanism according to claim 1, characterized in that: The handle is arranged on the handle seat axis of the shell through a handle axis hole, and the handle is located at the opening portion of the shell.

3. The circuit breaker operating mechanism according to claim 1, characterized in that: One end of the lock spring is arranged on the lock boss of the handle, and the other end is arranged on the lock spring hanging hole of the lock plate.

4. The circuit breaker operating mechanism according to claim 1, characterized in that: One end of the contact spring is arranged on the hanging spring terminal of the housing, and the other end is arranged on the contact spring hanging hole of the moving contact piece.

5. The circuit breaker operating mechanism according to claim 1, characterized in that: The opening and closing shaft is sequentially penetrated by the rotating seat hole of the locking piece and the long slot hole of the moving contact piece; as the U-shaped rod continues to push, the opening and closing shaft slides in the long slot hole, and at the same time, under the pulling force of the contact spring, the moving contact of the moving contact piece is always in contact and interact with the static contact on the shell.

6. The circuit breaker operating mechanism according to claim 1, characterized in that: The first rod contact surface is provided at one end of the opening and closing switching slot hole, and a yield groove is provided at the other end; the release pushing part on the locking plate is pushed to make the locking plate rotate counterclockwise, and one end of the U-shaped rod slides from the first rod contact surface to the yield groove, and the moving contact piece rotates counterclockwise around the opening and closing shaft under the pulling force of the contact spring, so that the moving contact is separated from the static contact and reset to the open state.

7. The circuit breaker operating mechanism according to claim 1, characterized in that: The locking plate is also provided with an assembling shaft connecting hole, the assembling shaft connecting hole is located at one side of the rotating seat hole, and the assembling shaft connecting hole is used for installing a linkage shaft for multi-pole opening linkage.

8. A circuit breaker, characterized in that: The circuit breaker is provided with a circuit breaker operating mechanism as described in any one of claims 1 to 7 in a housing.

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