Interlocking device for drawer unit of molded case circuit breaker with electric operation

Abstract

The utility model relates to an interlocking device for a drawer unit of a live plastic case circuit breaker, and belongs to the technical field of interlocking design of drawer units. It includes a locking electromagnet and a drawer unit position micro switch. The auxiliary point of the circuit breaker is connected in series to the control circuit of the locking electromagnet, and can control the energization and de-energization of the locking electromagnet coil; the drawer unit position micro switch is connected in series to the control circuit of the circuit breaker to lock the closing and opening operations of the circuit breaker, ensuring that the circuit breaker can only perform closing and opening actions when the drawer unit is in the test position or the working position; the connecting rod locking mechanism is provided with an interlocking hole that cooperates with the locking electromagnet, and the guide rod of the locking electromagnet is controlled to extend into or out of the interlocking hole through the energization and de-energization state of the coil, so as to realize the interlocking or unlocking of the connecting rod locking mechanism. The utility model has the following beneficial effects: the application aims to realize a tight and reliable electrical and mechanical interlocking function between the circuit breaker and the drawer unit.

Description

Technical Field

[0001] The utility model relates to an interlocking device for a drawer unit of a live-operated molded case circuit breaker, belonging to the technical field of interlocking design of drawer units. Background Art

[0002] With the development of intelligent power supply systems, low-voltage intelligence has become a trend. At present, the conventional solution for intelligent low-voltage cabinets usually adopts live operation of molded case circuit breakers to realize local and remote closing and opening of circuit breakers.

[0003] After searching, the utility model with patent number CN201120192064.8 discloses a drawer unit of a low-voltage switch cabinet. The unit partition is provided with a double-sided rack, the length direction of which is the in-and-out direction of the drawer unit. The unit mounting plate is provided with a motor, and the main gear is installed on the shaft of the motor, and the main gear is meshed with the double-sided rack. With the above technical solution, the drawer unit is automatically controlled to enter and exit by the forward and reverse rotation of the motor, which is easy to operate; the automation and remote control of the entry and exit of the drawer unit can be realized by using a controller or a button, without manual moving or pushing and pulling and other live operations.

[0004] The above patent has the following drawbacks: Since the electrically operated molded case circuit breaker lacks the function of setting an operating lever, it is impossible to achieve effective mechanical interlocking between the circuit breaker and the hand-pull mechanism of the drawer unit. In order to prevent the drawer unit from being pushed or pulled under load, a locking mechanism for the circuit breaker and the drawer unit operation still needs to be considered.

[0005] It is now necessary to design a special live-operated molded case circuit breaker drawer unit interlocking device to achieve electrical and mechanical interlocking between the circuit breaker and the drawer unit. Utility Model Content

[0006] In view of the above deficiencies in the prior art, the technical problem to be solved by the present invention is: how to achieve a tight and reliable electrical and mechanical interlocking function between the circuit breaker and the drawer unit, and to provide a live operated molded case circuit breaker drawer unit interlocking device for this purpose.

[0007] The utility model discloses an interlocking device for a drawer unit of a live molded case circuit breaker, wherein a movable drawer unit is provided with a connecting rod locking mechanism, a circuit breaker and a control circuit of the circuit breaker, and is characterized in that: the device comprises a locking electromagnet and a drawer unit position micro switch fixed in the drawer unit, wherein the auxiliary point of the circuit breaker is connected in series to the control circuit of the locking electromagnet, and can control the energization and de-energization of the locking electromagnet coil; the drawer unit position micro switch is connected in series to the control circuit of the circuit breaker, and is used to lock the closing and opening operations of the circuit breaker, and ensure that the circuit breaker can perform the closing and opening actions only when the drawer unit is in the test position or the working position; the connecting rod locking mechanism is provided with an interlocking hole matched with the locking electromagnet, and the guide rod of the locking electromagnet is controlled to extend into or out of the interlocking hole through the energization and de-energization state of the coil, so as to realize the interlocking or unlocking of the connecting rod locking mechanism.

[0008] The device is designed to prevent the drawer unit from being pulled out or pushed in when the circuit breaker is in the closed state (to prevent the drawer unit from being pushed or pulled under load), and to prevent the circuit breaker from performing non-compliant closing and opening operations outside the test position and working position.

[0009] Preferably, the drawer unit position microswitch includes a working position microswitch and a test position microswitch installed in the drawer unit. When the drawer unit is in a position other than the test position and the working position, the working position microswitch and the test position microswitch are both in the open state. When the drawer unit is in the test position, the test position microswitch is restored to the closed state. When the drawer unit is in the working position, the working position microswitch is restored to the closed state.

[0010] Preferably, the connecting rod locking mechanism includes a horizontally arranged operating connecting rod and a vertically arranged vertical rod, and the operating connecting rod and the vertical rod are respectively slidably installed on the bottom plate of the drawer unit, and the two ends of the operating connecting rod are respectively connected to the compression spring and the drawer unit mechanical button, and the other end of the compression spring is connected to the spring seat on the bottom plate of the drawer unit. The end of the operating connecting rod close to the drawer unit mechanical button is provided with a locking hole that cooperates with the guide rod of the locking electromagnet, and also includes a transmission gear that converts the horizontal movement of the operating connecting rod into the vertical movement of the vertical rod.

[0011] Preferably, the transmission gear is rotatably mounted on the corresponding wheel frame, and the operating connecting rod and the vertical rod are respectively provided with meshing teeth that mesh with the transmission gear for transmission.

[0012] The extension and retraction of the locking electromagnet guide rod regulates the motion trajectory of the operating connecting rod, thereby effectively realizing the locking function of the drawer operation.

[0013] The operating link is a mechanical operating link of the drawer unit, and its movement links the lifting and lowering movement of the vertical rod. An interlocking hole is provided on the operating link, and the movement of the mechanical operating link is controlled by locking with the interlocking hole.

[0014] The vertical rod is a locking mechanism component of the drawer unit, and realizes the mechanical locking of the push-pull operation of the drawer unit through mechanical interlocking with the cabinet accessories.

[0015] In this application, the energization and de-energization of the locking electromagnet are controlled by the auxiliary point of the circuit breaker. When the drawer unit is in the working position: (1) When the circuit breaker is in the closed state, the normally open contact of the circuit breaker is closed, the locking electromagnet is energized, and the guide rod of the locking electromagnet extends and inserts into the interlocking hole on the operating connecting rod. The operating connecting rod cannot move, resulting in the mechanical button of the drawer unit being unable to be pressed. At this time, the vertical rod extends out of the drawer bottom plate and forms a mechanical lock with the cabinet accessories, and the drawer unit cannot be pulled out, thereby preventing the operator from pulling out the drawer unit with load (preventing the disconnector from being disconnected with load); (2) When the circuit breaker is in the open state, the normally open contact of the circuit breaker is disconnected, the locking electromagnet is de-energized, the guide rod of the locking electromagnet returns to its original state, and the mechanical interlock between the electromagnet guide rod and the mechanism operating connecting rod is released. When the mechanical operating button of the drawer unit is pressed, the operating connecting rod moves and links the vertical rod to rise above the drawer bottom plate, releasing the mechanical lock between the vertical rod and the cabinet accessories, and the drawer unit can be pulled out.

[0016] When the drawer unit is in the test position: (1) When the circuit breaker is in the closed state, the normally open contact of the circuit breaker is closed, the locking electromagnet is energized, the guide rod of the locking electromagnet extends out and inserts into the interlocking hole on the operating link, and the operating link cannot move horizontally, resulting in the drawer unit mechanical button cannot be pressed. At this time, the vertical rod extends out of the drawer bottom plate and forms a mechanical lock with the cabinet accessories, and the drawer unit cannot be pushed in, thereby preventing the operator from pushing the drawer unit with load (preventing the disconnector from closing with load); (2) When the circuit breaker is in the open state, the normally open contact of the circuit breaker is disconnected, the locking electromagnet loses power, the guide rod of the locking electromagnet does not move, the guide rod of the locking electromagnet returns to its original state, and the mechanical interlock between the electromagnet guide rod and the mechanism operating link is released. When the mechanical button of the drawer unit is pressed, the mechanism operating link moves and the linkage vertical rod rises above the drawer bottom plate, releasing the mechanical lock between the vertical rod and the cabinet accessories, and the drawer unit can be pushed in.

[0017] When the drawer unit is in the isolation and withdrawal position, the control power is off, the locking electromagnet is always in a power-off state, the guide rod of the locking electromagnet returns to its original state, the lock is released, and the drawer unit can be pushed and pulled; when the drawer unit is in a position other than the test position and the working position, the test position microswitch and the working position microswitch are both open. At this time, the circuit breaker closing and opening control circuit is open, and the circuit breaker cannot perform closing and opening operations, thereby effectively avoiding electrical safety risks caused by improper closing or opening operations during the withdrawal and advancement of the drawer unit.

[0018] Compared with the prior art, the utility model has the following beneficial effects:

[0019] The utility model discloses an interlocking device for the drawer unit of a live molded case circuit breaker, and the present application aims to realize a tight and reliable electrical and mechanical interlocking function between the circuit breaker and the drawer unit. The device can effectively prevent the drawer unit from being pulled out or pushed in by mistake when the circuit breaker is in the closed state, thereby eliminating the potential safety hazards caused by improper human operation. At the same time, the device also has the ability to prevent the circuit breaker from closing and opening in areas other than the test position and the working position, further improving the safety performance of the equipment. By applying this interlocking device, the risk of human operation can be significantly reduced, the occurrence of electrical accidents can be effectively reduced, and the stable operation of the power system can be ensured. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for the specific embodiments or the description of the prior art. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn according to the actual scale.

[0021] Figure 1 The structure of the utility model is shown in FIG. Figure 1 ;

[0022] Figure 2 The structure of the utility model is shown in FIG. Figure 2 ;

[0023] Figure 3 It is the schematic diagram of the interlocking device of the drawer unit of the live molded case circuit breaker.

[0024] Figure 4 It is a structural schematic diagram of the connecting rod locking mechanism.

[0025] In the figure: 1, drawer unit 2, connecting rod locking mechanism 2.1, compression spring 2.2, operating connecting rod 2.3, drawer unit mechanical button 2.4, locking hole 2.5, vertical rod 2.6, transmission gear 3, locking electromagnet 4, working position micro switch 5, test position micro switch. DETAILED DESCRIPTION

[0026] The utility model is further described below in conjunction with the accompanying drawings: The utility model is further illustrated below through specific embodiments, but is not intended to limit the utility model. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the invention should be included in the protection scope of the utility model.

[0027] Embodiment 1, as Figure 1-2As shown, the drawer unit interlocking device of a live molded case circuit breaker is provided with a connecting rod locking mechanism 2, a circuit breaker QF and a control circuit of the circuit breaker QF, in a movable drawer unit 1, including a locking electromagnet 3 fixed in the drawer unit and a drawer unit position microswitch, the auxiliary point of the circuit breaker QF is connected in series to the control circuit of the locking electromagnet 3, and can control the energization and de-energization of the locking electromagnet coil; the drawer unit position microswitch is connected in series to the control circuit of the circuit breaker QF, and is used to lock the closing and opening operations of the circuit breaker QF, ensuring that the circuit breaker QF can only perform the closing and opening actions when the drawer unit is in the test position or the working position; the connecting rod locking mechanism 2 is provided with an interlocking hole that cooperates with the locking electromagnet 3, and the guide rod of the locking electromagnet 3 is controlled to extend into or out of the interlocking hole through the energized and de-energized state of the coil, so as to realize the interlocking or unlocking of the connecting rod locking mechanism 2.

[0028] The present application aims to realize a tight and reliable electrical and mechanical interlocking function between the circuit breaker and the drawer unit. The device can effectively prevent the drawer unit from being pulled out or pushed in by mistake when the circuit breaker is in the closed state, thereby eliminating the potential safety hazards caused by improper human operation. At the same time, the device also has the ability to prevent the circuit breaker from closing and opening in areas other than the test position and the working position, further improving the safety performance of the equipment. By applying this interlocking device, the risk of human operation can be significantly reduced, the occurrence of electrical accidents can be effectively reduced, and the stable operation of the power system can be ensured.

[0029] Embodiment 2, as Figure 1-3 As shown, the drawer unit interlocking device of a live molded case circuit breaker is provided with a connecting rod locking mechanism 2, a circuit breaker QF and a control circuit of the circuit breaker QF, in a movable drawer unit 1, including a locking electromagnet 3 fixed in the drawer unit and a drawer unit position microswitch, the auxiliary point of the circuit breaker QF is connected in series to the control circuit of the locking electromagnet 3, and can control the energization and de-energization of the locking electromagnet coil; the drawer unit position microswitch is connected in series to the control circuit of the circuit breaker QF, and is used to lock the closing and opening operations of the circuit breaker QF, ensuring that the circuit breaker QF can only perform the closing and opening actions when the drawer unit is in the test position or the working position; the connecting rod locking mechanism 2 is provided with an interlocking hole that cooperates with the locking electromagnet 3, and the guide rod of the locking electromagnet 3 is controlled to extend into or out of the interlocking hole through the energized and de-energized state of the coil, so as to realize the interlocking or unlocking of the connecting rod locking mechanism 2.

[0030] Furthermore, the drawer unit position microswitch includes a working position microswitch 4 and a test position microswitch 5 installed in the drawer unit. When the drawer unit is in a position other than the test position and the working position, the working position microswitch 4 and the test position microswitch 5 are both in the open state. When the drawer unit is in the test position, the test position microswitch 5 is restored to the closed state. When the drawer unit is in the working position, the working position microswitch 4 is restored to the closed state.

[0031] Further, refer to Figure 4 The connecting rod locking mechanism 2 includes a horizontally arranged operating connecting rod 2.2 and a vertically arranged vertical rod 2.5. The operating connecting rod 2.2 and the vertical rod 2.5 are respectively slidably installed on the bottom plate of the drawer unit. The two ends of the operating connecting rod 2.2 are respectively connected to the compression spring 2.1 and the drawer unit mechanical button 2.3. The other end of the compression spring 2.1 is connected to the spring seat on the bottom plate of the drawer unit. The end of the operating connecting rod 2.2 close to the drawer unit mechanical button 2.3 is provided with a locking hole 2.4 that cooperates with the guide rod of the locking electromagnet 3, and also includes a transmission gear 2.6 that converts the horizontal movement of the operating connecting rod 2.2 into the vertical movement of the vertical rod 2.5.

[0032] Furthermore, the transmission gear 2.6 is rotatably mounted on the corresponding wheel frame, and the operating connecting rod 2.2 and the vertical rod 2.5 are respectively provided with meshing teeth that mesh with the transmission gear 2.6 for transmission.

[0033] The extension and retraction of the guide rod of the locking electromagnet 3 further regulates the motion trajectory of the operating link 2.2, thereby effectively realizing the locking function of the drawer operation.

[0034] The operating link is a mechanical operating link of the drawer unit, and its movement links the lifting and lowering movement of the vertical rod. An interlocking hole is provided on the operating link, and the movement of the mechanical operating link is controlled by locking with the interlocking hole.

[0035] The vertical rod is a locking mechanism component of the drawer unit, and realizes the mechanical locking of the push-pull operation of the drawer unit through mechanical interlocking with the cabinet accessories.

[0036] The present application controls the energization and de-energization of the locking electromagnet by the auxiliary point of the circuit breaker. When the drawer unit is in the working position: 1. When the circuit breaker is in the closed state, the normally open contact of the circuit breaker is closed, the locking electromagnet is energized, the guide rod of the locking electromagnet extends out, and is inserted into the interlocking hole on the operating connecting rod. The operating connecting rod cannot move, resulting in the mechanical button of the drawer unit being unable to be pressed. At this time, the vertical rod extends out of the drawer bottom plate and forms a mechanical lock with the cabinet accessories, and the drawer unit cannot be pulled out, thereby preventing the operator from pulling out the drawer unit with load and preventing the disconnector from being disconnected with load; 2. When the circuit breaker is in the open state, the normally open contact of the circuit breaker is disconnected, the locking electromagnet loses power, the guide rod of the locking electromagnet returns to its original state, and the mechanical interlock between the electromagnet guide rod and the mechanism operating connecting rod is released. When the mechanical operating button of the drawer unit is pressed, the operating connecting rod moves and links the vertical rod to rise above the drawer bottom plate, releasing the mechanical lock between the vertical rod and the cabinet accessories, and the drawer unit can be pulled out at this time.

[0037] When the drawer unit is in the test position: 1. When the circuit breaker is in the closed state, the normally open contact of the circuit breaker is closed, the locking electromagnet is energized, the guide rod of the locking electromagnet extends out, and is inserted into the interlocking hole on the operating connecting rod. The operating connecting rod cannot move horizontally, resulting in the inability to press the mechanical button of the drawer unit. At this time, the vertical rod extends out of the drawer bottom plate and forms a mechanical lock with the cabinet accessories, and the drawer unit cannot be pushed in, thereby preventing the operator from pushing the drawer unit with load to prevent the disconnector from being closed with load; 2. When the circuit breaker is in the open state, the normally open contact of the circuit breaker is disconnected, the locking electromagnet loses power, the guide rod of the locking electromagnet does not move, the guide rod of the locking electromagnet returns to its original state, and the mechanical interlock between the electromagnet guide rod and the mechanism operating connecting rod is released. When the mechanical button of the drawer unit is pressed, the mechanism operating connecting rod moves and the linkage vertical rod rises above the drawer bottom plate, releasing the mechanical lock between the vertical rod and the cabinet accessories, and the drawer unit can be pushed in.

[0038] When the drawer unit is in the isolation and withdrawal position, the control power is off, the locking electromagnet is always in a power-off state, the guide rod of the locking electromagnet returns to its original state, the lock is released, and the drawer unit can be pushed and pulled; when the drawer unit is in a position other than the test position and the working position, the test position microswitch and the working position microswitch are both open. At this time, the circuit breaker closing and opening control circuit is open, and the circuit breaker cannot perform closing and opening operations, thereby effectively avoiding electrical safety risks caused by improper closing or opening operations during the withdrawal and advancement of the drawer unit.

[0039] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection claimed by the present utility model is defined by the attached claims and their equivalents.

[0040] The matters not described in detail in the present invention are all known technologies to those skilled in the art.

Claims

1. A drawer unit interlocking device for a live molded case circuit breaker, wherein a movable drawer unit (1) is provided with a connecting rod locking mechanism (2), a circuit breaker (QF) and a control circuit of the circuit breaker (QF), characterized in that: The invention comprises a locking electromagnet (3) fixed in a drawer unit and a drawer unit position micro switch. The auxiliary point of the circuit breaker (QF) is connected in series to the control circuit of the locking electromagnet (3) to control the energization and de-energization of the locking electromagnet coil. The drawer unit position micro switch is connected in series to the control circuit of the circuit breaker (QF) to lock the closing and opening operations of the circuit breaker (QF) to ensure that the circuit breaker (QF) can perform the closing and opening actions only when the drawer unit is in the test position or the working position. The connecting rod locking mechanism (2) is provided with an interlocking hole that cooperates with the locking electromagnet (3). The guide rod of the locking electromagnet (3) is controlled to extend into or out of the interlocking hole according to the energization and de-energization state of the coil, thereby realizing the interlocking or unlocking of the connecting rod locking mechanism (2).

2. The drawer unit interlocking device for live molded case circuit breaker according to claim 1 is characterized in that: The drawer unit position micro switch comprises a working position micro switch (4) and a test position micro switch (5) installed in the drawer unit. When the drawer unit is in a position other than the test position and the working position, the working position micro switch (4) and the test position micro switch (5) are both in an open state. When the drawer unit is in the test position, the test position micro switch (5) is restored to a closed state. When the drawer unit is in the working position, the working position micro switch (4) is restored to a closed state.

3. The drawer unit interlocking device for live molded case circuit breaker according to claim 2 is characterized in that: The connecting rod locking mechanism (2) comprises a horizontally arranged operating connecting rod (2.2) and a vertically arranged vertical rod (2.5), wherein the operating connecting rod (2.2) and the vertical rod (2.5) are respectively slidably mounted on the bottom plate of the drawer unit, and the two ends of the operating connecting rod (2.2) are respectively connected to a compression spring (2.1) and a mechanical button (2.3) of the drawer unit, and the other end of the compression spring (2.1) is connected to a spring seat on the bottom plate of the drawer unit. The end of the operating connecting rod (2.2) close to the mechanical button (2.3) of the drawer unit is provided with a locking hole (2.4) that cooperates with a guide rod of a locking electromagnet (3), and also comprises a transmission gear (2.6) that converts the horizontal movement of the operating connecting rod (2.2) into the vertical movement of the vertical rod (2.5).

4. The drawer unit interlocking device for live molded case circuit breaker according to claim 3 is characterized in that: The transmission gear (2.6) is rotatably mounted on the corresponding wheel frame, and the operating connecting rod (2.2) and the vertical rod (2.5) are respectively provided with meshing teeth that mesh with the transmission gear (2.6) for transmission.

Images