Magnetic control type double-power-supply plastic shell switch mechanical interlocking device

Abstract

A magnetic control type double-power-supply plastic shell switch mechanical interlocking device comprises a switch shell, two static contacts of a double-power-supply plastic shell switch are arranged in the switch shell, a supporting frame is arranged above the switch shell, two magnetic control mechanisms are symmetrically arranged in the supporting frame, and each magnetic control mechanism comprises a static iron core and a movable iron core which are arranged up and down and can be connected in a magnetic attraction mode; a gear box is arranged in the middle of the upper portion of the supporting frame, a driven gear and racks arranged on the two sides of the driven gear and meshed with the driven gear are arranged in the gear box, the driven gear is rotationally connected into the gear box, moving contacts matched with the static contacts are arranged at the lower end of the pull rod, the upper portion of the pull rod is connected with the moving iron core, and the two sets of moving contacts and the corresponding static contacts are not closed or separated at the same time. The two magnetic control mechanisms can be opened or closed independently and are in transmission connection with the driven gear through the pull rod and the rack respectively, so that one magnetic control mechanism is switched off or switched on, and the other magnetic control mechanism is switched on or switched off. One magnetic control mechanism for opening or closing drives the rack to move upwards or downwards through the pull rod and the transverse rod, so that the other magnetic control mechanism can complete closing or opening.

Description

Technical Field

[0001] This utility model relates to the field of dual-power automatic transfer switch technology, specifically a magnetically controlled dual-power molded case switch mechanical interlock device. Background Technology

[0002] A molded case dual power automatic transfer switch is a device in a power system used to automatically transfer the load from the main power source to the backup power source when the main power source fails.

[0003] Existing molded case dual-power automatic transfer switches typically achieve automatic switching between dual power supplies using a rack and pinion structure. Specifically, a motor drives a drive gear to rotate and mesh with two racks on either side. The two racks move linearly in opposite directions, and a push rod connected to the drive rack drives the two molded case switches to open and close. However, existing technology uses a single drive method. If the drive motor or drive gear fails, neither of the dual power switches can achieve the desired on / off state. Furthermore, this structure, which converts rotational motion to linear motion, is relatively complex. The conversion from rotational to linear motion and the start / stop of the motor increase the switching time, making it unsuitable for applications requiring high switching speeds. Utility Model Content

[0004] To address the technical problems existing in the background art, this utility model provides a magnetically controlled dual-power molded case switch mechanical interlock device.

[0005] The technical solution of this utility model is as follows:

[0006] A magnetically controlled dual-power plastic case switch mechanical interlocking device includes a switch housing with two stationary contacts of the dual-power plastic case switch inside. A support frame is provided above the switch housing, and two magnetic control mechanisms are symmetrically arranged inside the support frame. Each magnetic control mechanism includes a stationary iron core and a moving iron core that are arranged vertically and magnetically connected.

[0007] A gearbox is located in the middle of the upper part of the support frame. Inside the gearbox are driven gears and racks on both sides that mesh with them. The driven gear is rotatably connected inside the gearbox. Both racks are vertically arranged. A pull rod is connected to one side of each rack, which passes downward through the moving iron core and the stationary iron core in sequence. The lower end of the pull rod is provided with a moving contact that cooperates with the stationary contact. The upper part of the pull rod is connected to the moving iron core. The two sets of moving contacts and their corresponding stationary contacts do not close or separate at the same time.

[0008] The two magnetic control mechanisms can be opened or closed independently, and are respectively connected to driven and driven gears via pull rods and racks. This allows one magnetic control mechanism to open or close, while the other closes or opens. The opening or closing magnetic control mechanism drives the rack to move up or down via pull rods and horizontal rods, enabling the other magnetic control mechanism to close or open. The driven gears are interlocked with the two racks, allowing the two magnetic control mechanisms to open and close sequentially, without opening or closing simultaneously, thus achieving instantaneous switching between the working and standby switches of the dual-power molded case switch.

[0009] The aforementioned pull rod is used to drive the corresponding moving iron core to move up or down. Its specific structure is that the pull rod is vertically inserted into the moving iron core and the stationary iron core, and its upper end is vertically connected to a horizontal rod. The end of the horizontal rod away from the pull rod is connected to its corresponding rack.

[0010] The connection structure between the two moving iron cores and the pull rod is such that the upper part of each moving iron core is connected to the upper part of the corresponding pull rod through a circular connecting plate.

[0011] To facilitate the magnetic attraction or detachment of the moving iron core from its corresponding stationary iron core in the vertical direction, and to prevent misalignment or offset of the contact surfaces with the stationary iron core, the support frame includes an upper plate at the top. The upper plate has guide holes adapted to the connecting plate, and the inner diameter of the guide holes is 0.1-1 cm larger than the outer diameter of the connecting plate.

[0012] To ensure that the moving iron core can accurately contact and connect with the stationary iron core below during the opening and closing process of the magnetic control mechanism, thereby connecting the working switch or the standby switch, the maximum opening and closing distance between the moving iron core and the stationary iron core is consistent with the maximum opening and closing distance between the moving contact and the stationary contact.

[0013] To facilitate the disengagement of the rack and driven gear corresponding to the magnetic control mechanism of the circuit breaker, without affecting the meshing of the rack and driven gear corresponding to the other magnetic control mechanism, the rack near the driven gear includes toothed and toothless sections distributed vertically. The length of the toothed section along the length of the rack is not less than the length of the toothless section along the length of the rack.

[0014] Regarding the correspondence between the teeth of the rack and the driven gear, it is convenient that the rack and the driven gear corresponding to the magnetic control mechanism for opening the circuit breaker are in a disengaged state. The teeth of both racks have the same tooth module as the driven gear, and the ratio of the teeth of the rack to the teeth of the driven gear is 0.5-0.8. The number of teeth on the toothed section of the rack is less than the number of teeth on the driven gear. This is convenient so that when the magnetic control mechanism corresponding to the rack is opening the circuit breaker, the driven gear can engage with the toothless section of the rack without affecting the closing of the magnetic control mechanism on the other side.

[0015] To enable the transverse rod to move smoothly up or down vertically, symmetrical sliding interfaces are provided on both sides of the gearbox. The transverse rod passes through the corresponding sliding interface. The height of the sliding interface is greater than the maximum opening and closing distance between the moving iron core and the stationary iron core, and its width is adapted to the width of the transverse rod.

[0016] The beneficial effects of this utility model are as follows:

[0017] The two magnetic control mechanisms can be opened or closed independently, and the problem of the working switch and backup switch of the dual-power molded case switch not being able to switch normally due to motor or drive gear failure in the existing technology will not be solved.

[0018] Furthermore, the two magnetic control mechanisms are respectively connected to driven and driven gears via pull rods, horizontal rods, and racks, so that one magnetic control mechanism can open or close, and the other magnetic control mechanism can close or open. The magnetic control mechanism that opens or closes drives the rack to move up or down via the pull rod, so that the other magnetic control mechanism can complete the closing or opening. Moreover, through the interlock between the driven gear and the two racks, the two magnetic control mechanisms can open and close sequentially, but not simultaneously, realizing the instantaneous switching of the working switch and the standby switch of the dual power molded case switch.

[0019] The guide holes on the support frame guide the pull rod as it moves up and down, preventing it from swaying too much and affecting the accurate magnetic attraction between the moving iron core and the stationary iron core, which would prevent the corresponding moving and stationary contacts from making good contact when closing the circuit. The sliding interfaces on both sides of the gearbox guide the up and down movement of the transverse rod, improving the stability of the pull rod's up and down movement.

[0020] The mechanical interlock device of this utility model ensures that two power supplies cannot be switched on at the same time through mechanical means, thereby avoiding the risks of parallel operation of power supplies and reverse power supply. The mechanical interlock device of the dual power supply molded case switch can realize the instantaneous switching between the working switch and the standby switch in the circuit. The mechanical interlock structure prevents the dual power supply switches from being turned on at the same time, and can ensure that when one switch is turned off, the other switch is not affected.

[0021] The driven gear is a driven structure that rotates by the up-and-down movement of racks on both sides. Compared with the driving gear driven by a motor in the existing technology, it has less wear and a lower probability of failure. It can greatly reduce the phenomenon that the two switches of the dual power supply molded case switch cannot be switched normally due to motor or driving gear failure. Attached Figure Description

[0022] In the attached diagram:

[0023] Figure 1 Here is a schematic diagram of the cross-sectional structure:

[0024] Figure 2This is a schematic diagram of the structure of the left rack, the right rack, and the driven gear;

[0025] The components represented by the various reference numerals in the diagram are:

[0026] 1. Switch housing; 2. Support frame; 201. Upper plate; 2011. Guide hole; 3. Stationary contact; 4. Left magnetic control mechanism; 5. Left pull rod; 6. Left rack; 7. Driven gear; 8. Right magnetic control mechanism; 9. Right pull rod; 10. Right rack; 11. Connecting plate; 12. Gearbox; 1201. Sliding interface; 13. Moving contact; 14. Horizontal rod; 15. Opening spring; 16. Excitation coil. Detailed Implementation

[0027] See Figure 1 As shown, a magnetically controlled dual-power molded case switch mechanical interlock device includes a switch housing 1, which houses two stationary contacts 3 of the dual-power molded case switch. A support frame 2 is located above the switch housing 1, and two magnetic control mechanisms are symmetrically arranged within the support frame 2. Each magnetic control mechanism includes a stationary iron core, a moving iron core, a tripping spring 15, an excitation coil 16, and a pull rod. The magnetic control mechanism uses the excitation coil 16 to attract the stationary and moving iron cores, providing a closing force for the switch; and releases the compression force of the tripping spring, providing a tripping force for the switch. The stationary and moving iron cores are arranged vertically and can be magnetically connected. The magnetic control mechanism in this embodiment is existing technology and can be a magnetic control mechanism for circuit breakers or a magnetically controlled single-stable Case switch mechanism from Yue Neng Electric Co., Ltd., enabling rapid opening and closing, thereby driving the pull rod to move up or down.

[0028] Among them, a gearbox 12 is provided in the middle of the upper part of the support frame 2. The gearbox 12 is provided with a driven gear 7 and racks on both sides of it and meshing with it. The driven gear 7 is rotatably connected in the gearbox 12. Both racks are vertically arranged and located in the same vertical plane. A pull rod is connected to one side of each rack and passes through the moving iron core and the stationary iron core in sequence. The lower end of the pull rod is provided with a moving contact 13 that cooperates with the stationary contact 3. The upper part of the pull rod is connected to the moving iron core. The two sets of moving contacts 13 and their corresponding stationary contacts 3 do not close or separate at the same time.

[0029] To ensure that the rack corresponding to the magnetic control mechanism for opening the circuit breaker is disengaged from the driven gear 7 without affecting the meshing of the rack corresponding to the driven gear 7 in the other magnetic control mechanism, the rack near the driven gear 7 includes toothed and toothless sections distributed vertically. The length of the toothed section along the length of the rack is not less than the length of the toothless section along the length of the rack. Regarding the correspondence between the teeth of the rack and the driven gear 7, to facilitate the disengagement of the rack corresponding to the magnetic control mechanism for opening the circuit breaker from the driven gear 7, the tooth module of the rack and the driven gear 7 are the same, and in this embodiment, the ratio of the teeth of the rack to the teeth of the driven gear 7 is 1:2.

[0030] The two magnetic control mechanisms can be opened or closed independently. Each mechanism is connected to a driven gear 7 via a pull rod and a rack, allowing one mechanism to open or close, and the other to close or open. The opening or closing mechanism moves the rack up or down via the pull rod, enabling the other mechanism to close or open. The driven gear 7 is interlocked with both racks, allowing the two mechanisms to open and close sequentially, without simultaneous opening or closing, thus enabling instantaneous switching between the working and standby switches of the dual-power molded case switch. To ensure the moving iron core accurately contacts the stationary iron core during the opening and closing process of the magnetic control mechanism, facilitating the connection of the working or standby switch, the maximum opening / closing distance between the moving and stationary iron cores is consistent with the maximum opening / closing distance between the moving contact 13 and the stationary contact 3.

[0031] The aforementioned pull rod is used to move the corresponding moving iron core upwards or downwards. Its specific structure is as follows: the pull rod is vertically inserted into the moving and stationary iron cores, and its upper end is vertically connected to a horizontal rod 14. The end of the horizontal rod 14 furthest from the pull rod is connected to its corresponding rack. The two horizontal rods 14 are located in the same vertical plane and, when the dual-power molded case switch is in the closed or open position, can be staggered under the action of the rack and driven gear 7. The connection structure between the two moving iron cores and the corresponding pull rods is as follows: the upper part of each moving iron core is connected to the upper part of the corresponding pull rod through a circular connecting plate 11. To facilitate the moving iron core to magnetically attract or detach from its corresponding stationary iron core in the vertical direction, and to prevent misalignment or offset of the contact surface with the stationary iron core, the support frame 2 includes an upper plate 201 located at the upper end. The upper plate 201 has a guide hole 2011 adapted to the connecting plate 11. The inner diameter of the guide hole 2011 is 0.1-1 cm larger than the outer diameter of the connecting plate 11.

[0032] To enable the transverse rod 14 to move smoothly up or down in the vertical direction, the gearbox 12 has symmetrical sliding interfaces 1201 on both sides. The transverse rod 14 passes through the corresponding sliding interface 1201. The height of the sliding interface 1201 is greater than the maximum opening and closing distance between the moving iron core and the stationary iron core, and its width is adapted to the width of the transverse rod 14.

[0033] The guide hole 2011 on the support frame 2 can guide the pull rod when it moves up and down, so as to avoid the pull rod from shaking too much and affecting the moving iron core from being unable to accurately magnetically attract with the stationary iron core, which would cause the corresponding moving contact 13 and stationary contact 3 to not make good contact connection when closing; the sliding interface 1201 on both sides of the gearbox 12 can guide the up and down movement of the transverse rod 14 respectively, and improve the stability of the up and down movement of the pull rod in conjunction with the up and down movement of the pull rod.

[0034] This embodiment of the dual-power molded case switch includes two switch bodies arranged on the left and right sides, used to realize the on and off states of the dual-power molded case switch. To facilitate distinguishing the switching process between the working switch and the standby switch of the dual-power molded case switch, the following is provided: Figure 1 As shown, the magnetic control mechanism located on the left is designated as the left magnetic control mechanism 4, which includes a left moving iron core and a left stationary iron core. The pull rod located on the left is designated as the left pull rod 5, and the rack located on the left is designated as the left rack 6. The magnetic control mechanism located on the right is designated as the right magnetic control mechanism 8, which includes a right moving iron core and a right stationary iron core. The pull rod located on the right is designated as the right pull rod 9, and the rack located on the right is designated as the right rack 10.

[0035] When the switch body on the right side closes, the moving iron core of the right magnetic control mechanism 8 on the same side moves downward, causing the right pull rod 9 to drive the corresponding right rack 10 downward. During the downward movement, the right rack 10 meshes with the driven gear 7, and the driven gear 7 rotates clockwise. If the switch body on the left side is in the closed position at this time, it will open. The left rack 6 meshes with the driven gear 7, and the driven gear 7 drives the left rack 6 upward. The left pull rod 5 moves upward, and the moving contact 13 on the left side separates from the stationary contact 3. The switch body on the left side is opened, and interlocking is achieved through the meshing of the driven gear 7 with the left rack 6 and / or the right rack 10. If the switch body on the left side is already in the open position at this time, the left rack 6 disengages from the driven gear 7. The driven gear 7 is located in the toothless section of the left rack 6. The clockwise rotation of the driven gear 7 does not affect the left rack 6, and the switch body on the right side can close independently.

[0036] When the switch on the left side closes, the left moving iron core of the left magnetic control mechanism 4 moves downward, and the left pull rod 5 drives the rack connected to it to move downward. During the downward movement, the left rack 6 meshes with the driven gear 7, and the driven gear 7 rotates counterclockwise. If the switch body on the right side is in the closed position at this time, the right magnetic control mechanism 8 will open, the right rack 10 will mesh with the driven gear 7, the driven gear 7 will drive the right rack 10 to move upward, the right pull rod 9 will move upward, the moving contact 13 on the right side will separate from the corresponding stationary contact 3, and the switch body on the right side will open. If the switch body on the right side is already in the open position at this time, the right rack 10 will disengage from the driven gear 7, the driven gear 7 on the right side will be located in the toothless section of the right rack 10, and the counterclockwise rotation of the driven gear 7 will not affect the right rack 10, and the left switch will close independently.

[0037] When the switch body on the right side trips, the moving iron core of the right magnetic control mechanism 8 drives the right pull rod 9 upward. The right pull rod 9 drives the corresponding right rack 10 upward, and the right rack 10 drives the driven gear 7 to rotate counterclockwise. At this time, the switch body on the left side is in the tripped position, the left rack 6 disengages from the driven gear 7, and the right switch trips independently. When the switch body on the left side trips, the left moving iron core of the left magnetic control mechanism 4 drives the left pull rod upward. The left pull rod 5 drives the corresponding left rack 6 upward, and the left rack 6 drives the driven gear 7 to rotate clockwise. At this time, the switch body on the right side is in the tripped position, the right rack 10 disengages from the driven gear 7, and the switch body on the left side trips independently.

Claims

1. A magnetically controlled dual-power molded case switch mechanical interlock device, comprising a switch housing (1) containing two stationary contacts (3) of the dual-power molded case switch, characterized in that, The switch housing (1) is provided with a support frame (2) above it. Two magnetic control mechanisms are symmetrically arranged inside the support frame (2). Each magnetic control mechanism includes a stationary iron core and a moving iron core that are arranged vertically and magnetically connected. The support frame (2) is provided with a gearbox (12) in the middle of the upper part. The gearbox (12) is provided with a driven gear (7) and racks on both sides of it and meshing with it. The driven gear (7) is rotatably connected in the gearbox (12). Both racks are set vertically. A pull rod is connected to one side of each rack and passes through the moving iron core and the stationary iron core in sequence. The lower end of the pull rod is provided with a moving contact (13) that cooperates with the stationary contact (3). The upper part of the pull rod is connected to the moving iron core. The two sets of moving contacts (13) and their corresponding stationary contacts (3) do not close or separate at the same time.

2. The magnetically controlled dual-power molded case switch mechanical interlock device according to claim 1, characterized in that, The pull rod is vertically inserted into the moving iron core and the stationary iron core, and its upper end is vertically connected to a transverse rod (14). The end of the transverse rod (14) away from the pull rod is connected to its corresponding rack.

3. The magnetically controlled dual-power molded case switch mechanical interlock device according to claim 2, characterized in that, The upper part of the moving iron core is connected to the upper part of the pull rod through a circular connecting plate (11).

4. The magnetically controlled dual-power molded case switch mechanical interlock device according to claim 3, characterized in that, The support frame (2) includes an upper plate (201) located at the upper end. The upper plate (201) has a guide hole (2011) adapted to the connecting plate (11). The inner diameter of the guide hole (2011) is 0.1-1 cm larger than the outer diameter of the connecting plate (11).

5. A magnetically controlled dual-power molded case switch mechanical interlocking device according to claim 2, characterized in that, The maximum opening and closing distance between the moving iron core and the stationary iron core is consistent with the maximum opening and closing distance between the moving contact (13) and the stationary contact (3).

6. The magnetically controlled dual-power molded case switch mechanical interlock device according to claim 1, characterized in that, The rack near the driven gear (7) includes toothed and toothless sections distributed vertically, and the length of the toothed section along the length of the rack is not less than the length of the toothless section along the length of the rack.

7. The magnetically controlled dual-power molded case switch mechanical interlock device according to claim 1, characterized in that, The teeth of both racks have the same tooth module as the driven gear (7), and the ratio of the teeth of the racks to the teeth of the driven gear (7) is 0.5-0.

8.

8. A magnetically controlled dual-power molded case switch mechanical interlocking device according to claim 5, characterized in that, The gearbox (12) has symmetrical sliding interfaces (1201) on both sides. The transverse rod (14) passes through the corresponding sliding interface (1201). The height of the sliding interface (1201) is greater than the maximum opening and closing distance between the moving iron core and the stationary iron core, and its width is adapted to the width of the transverse rod (14).

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