A drawer seat and a drawer type circuit breaker
By introducing a worm gear and bearing structure into the drawer seat, rolling friction is used instead of sliding friction, which solves the problem of high torque when the circuit breaker body is rocked out, thus achieving labor-saving operation and protection of structural components.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- DELIXI ELECTRIC
- Filing Date
- 2025-06-23
- Publication Date
- 2026-06-19
AI Technical Summary
The circuit breaker body requires a large amount of torque to be swung out of the drawer, which makes operation inconvenient.
A worm gear and bearing structure is introduced into the drawer seat to reduce frictional resistance through rolling friction. The design of the worm gear and bearing reduces sliding friction, including the use of a first bearing and washer to limit bearing movement and protect it from impurities.
This effectively reduces the torque required to swing the circuit breaker body out of the drawer, lowers the risk of wear on structural components, and improves service life and ease of operation.
Smart Images
Figure CN224384897U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of electrical equipment technology, and in particular to a drawer base and a drawer-type circuit breaker. Background Technology
[0002] A circuit breaker is an electrical device used to protect circuits from faults such as overcurrent, overload, or short circuit. It automatically disconnects the circuit when it detects abnormal current, thereby protecting the circuit and equipment from damage.
[0003] A drawer-type circuit breaker is a type of circuit breaker in which the circuit breaker body is housed in a drawer-type socket. When repairing or replacing the circuit breaker body of a drawer-type circuit breaker, it is generally necessary to crank the circuit breaker body out of the drawer-type socket using a crank handle. However, the torque required to rotate the crank handle when cranking the circuit breaker body out of the drawer-type socket is relatively large. Utility Model Content
[0004] This application provides a drawer base and a drawer-type circuit breaker, which can reduce the torque required to swing the circuit breaker body out of the drawer base, thus saving effort.
[0005] In a first aspect, this application provides a drawer seat, which includes a base plate, a slide plate, a positioning locking plate, a worm gear, and a first bearing. The slide plate is slidably connected to the base plate and is used to cooperate with a circuit breaker body. The positioning locking plate is fixedly connected to the base plate and has a through hole and a first mounting hole that communicate with each other. The first mounting hole is farther away from the slide plate relative to the through hole, and a first stepped surface is formed between the first mounting hole and the through hole. The worm gear passes through the through hole and the first mounting hole, and the end of the worm gear near the slide plate is threadedly connected to the slide plate. The first bearing is sleeved on the worm gear and located in the first mounting hole. The side of the first bearing facing the slide plate makes rolling contact with the first stepped surface, and the side of the first bearing facing away from the slide plate makes rolling contact with a first limiting surface.
[0006] In this application, the side of the first bearing facing the slide plate makes rolling contact with the first stepped surface, and the side of the first bearing facing away from the slide plate makes rolling contact with the first limiting surface. In this way, the first bearing separates the positioning locking plate and the first limiting surface, avoiding direct contact between the first limiting surface and the positioning locking plate and the sliding friction that would occur when the worm gear rotates.
[0007] When the sliding plate applies a reaction force to the worm gear away from the crank handle, the first bearing rotates with the worm gear. The friction between the side of the first bearing facing the sliding plate and the first step surface is rolling friction, not sliding friction. The friction between the side of the first bearing facing away from the sliding plate and the first limiting surface is also rolling friction, not sliding friction. Since rolling friction is less than sliding friction under the same conditions, when the worm gear rotates to swing the circuit breaker body out of the drawer, the frictional resistance of the first step surface and the first limiting surface to the first bearing is relatively small. This results in less resistance to the rotation of the worm gear, thus reducing the torque required to swing the circuit breaker body out of the drawer, achieving a labor-saving effect.
[0008] In one possible design, the depth of the first mounting hole is the same as the height of the first bearing, and the depth of the first mounting hole is the axial dimension of the first mounting hole in the worm gear.
[0009] The above solution allows the first bearing to be fully embedded in the first mounting hole without occupying additional space, reducing the difficulty of adding the first bearing within the limited original design space. Furthermore, by fully embedding the first bearing in the first mounting hole, the design of adjacent structural components such as the original first limiting surface remains unchanged, reducing the cost of adding the first bearing. The addition of the first bearing in this application does not affect the shape of any structural components in the drawer base, demonstrating high operability and feasibility.
[0010] In one possible design, the worm has an outer shoulder on its peripheral wall, and the first limiting surface is configured such that the outer shoulder faces the side of the slide plate.
[0011] By using the above solution, the side of the outer shoulder facing the skateboard is used as the first limiting surface. This eliminates the need for additional limiting structures to restrict the first bearing from moving away from the skateboard on the worm gear, thus saving on the number of parts used.
[0012] In one possible design, the drawer seat also includes a first washer fitted onto the worm gear, the first washer being fixed in position along the axial direction of the worm gear, and a first limiting surface being configured such that the first washer faces the side of the slide plate.
[0013] With the above solution, the first washer is fitted onto the worm and tightly engaged with it, thus allowing the first washer to rotate with the worm. Furthermore, the axial position of the first washer on the worm can be fixed, so when the side of the first washer facing the slide plate contacts the first bearing, it can restrict the first bearing from moving away from the slide plate on the worm.
[0014] In one possible design, the outer diameter of the first washer is equal to the diameter of the first mounting hole.
[0015] With the above solution, when the first washer contacts the first bearing on the side facing the skateboard, the first washer can completely cover the side of the first bearing facing away from the skateboard. In this way, the first washer not only limits the movement of the first bearing but also protects it from impurities, thus extending its service life.
[0016] In one possible design, the drawer seat also includes a second bearing and a second washer. The second bearing and the second washer are fitted onto the worm gear. The side of the second bearing facing away from the slide plate makes rolling contact with the positioning lock plate, and the side of the second bearing facing the slide plate makes rolling contact with the second washer. The position of the second washer in the axial direction of the worm gear remains fixed.
[0017] With the above solution, the second bearing can separate the positioning locking plate and the second washer, preventing the second washer from directly contacting the positioning locking plate and causing sliding friction when the worm rotates.
[0018] When the sliding plate applies a reaction force to the worm gear in the direction of the crank handle, the second bearing rotates with the worm gear. The friction between the side of the second bearing facing away from the sliding plate and the positioning locking plate is rolling friction rather than sliding friction, and the friction between the side of the second bearing facing the sliding plate and the second washer is rolling friction rather than sliding friction. Therefore, when the worm gear rotates and the circuit breaker body is rocked into the drawer seat, the frictional resistance of the positioning locking plate and the second washer on the second bearing is relatively small, thus reducing the resistance to the rotation of the worm gear. This makes it easier to reduce the torque required to rock the circuit breaker body into the drawer seat, resulting in a labor-saving effect.
[0019] In addition, with both the positioning lock plate and the second washer rolling friction with the second bearing, the possibility of damage to interacting structural components such as the crank handle, worm gear, and positioning lock plate can be reduced when the circuit breaker body is rocked into the drawer seat.
[0020] In one possible design, the positioning locking plate also has a second mounting hole, which is closer to the slide plate than the first mounting hole. A second stepped surface exists between the second mounting hole and the through hole. A second bearing is located within the second mounting hole, and the side of the second bearing facing away from the slide plate makes rolling contact with the second stepped surface.
[0021] With the above solution, the second step surface is located on the positioning lock plate, which is fixedly connected to the base plate, so the position of the second step surface remains unchanged. Based on this, the second step surface contacts the side of the second bearing facing away from the slide plate, thus restricting the second bearing from moving away from the slide plate on the worm gear.
[0022] The second bearing is located within the second mounting hole, allowing it to be installed without occupying additional space outside the mounting hole, thus reducing the difficulty of installing the second bearing in a limited space. Since the second bearing does not occupy additional space outside the mounting hole, space can be freed up for the installation of other structural components, facilitating their placement.
[0023] In one possible design, the drawer seat also includes a third washer fitted onto the worm gear, with one side of the third washer in rolling contact with the second bearing and the other side in contact with the positioning lock plate.
[0024] With the above solution, the third washer is fitted onto the worm gear, and its axial position remains fixed. Therefore, when the third washer contacts the side of the second bearing facing away from the slide plate, it can restrict the second bearing from moving towards the slide plate. The third washer can fill the gap between two adjacent structural components, reducing the precision requirements for the machining of the two adjacent structural components and facilitating their correct assembly.
[0025] The third washer also makes rolling contact with the second bearing. When the slide plate applies a reaction force to the worm gear in the direction of the crank handle, the second bearing rotates with the worm gear. The side of the second bearing facing away from the slide plate makes rolling contact with the third washer. The friction is small and will not cause resistance to the rotation of the worm gear. Therefore, it is easy to reduce the torque required when the circuit breaker body is cranked into the drawer seat, which saves effort.
[0026] In one possible design, the first and second bearings are either flat rolling bearings or tapered bearings.
[0027] Secondly, this application provides a drawer-type circuit breaker, including a crank handle, a circuit breaker body, and the drawer base mentioned in the first aspect. The crank handle is connected to a worm gear in the drawer base. When the crank handle drives the worm gear to rotate relative to the bottom plate in the drawer base, the sliding plate moves relative to the worm gear, thereby cranking the circuit breaker body out of the drawer base, or cranking the circuit breaker body into the drawer base.
[0028] The above solution can reduce the torque required to swing the circuit breaker body out of the drawer, thus saving effort.
[0029] The advantages of the drawer-type circuit breaker provided in the second aspect and the various possible designs of the second aspect can be found in the first aspect and the various possible implementations of the first aspect, and will not be repeated here. Attached Figure Description
[0030] Figure 1 This is a schematic diagram of the structure of a drawer-type circuit breaker provided in an embodiment of this application.
[0031] Figure 2This is a schematic diagram of the structure of a drawer seat provided in an embodiment of this application.
[0032] Figure 3 yes Figure 2 A sectional view along section AA.
[0033] Figure 4 This is a schematic diagram of the structure of a positioning lock plate provided in an embodiment of this application.
[0034] Figure 5 This is a schematic diagram of the structure of a skateboard provided in an embodiment of this application.
[0035] Figure 6 yes Figure 3 Enlarged view of section B.
[0036] Figure 7 This is a schematic diagram of another drawer seat provided in an embodiment of this application.
[0037] Explanation of reference numerals in the attached figures:
[0038] 100. Crank handle;
[0039] 200. Circuit breaker body;
[0040] 300. Drawer seat; 310. Worm gear; 320. Slide plate; 321. Toothed hole; 322. First plate; 323. Second plate; 330. Shaft; 340. Half-gear; 350. Shift fork; 360. Base plate; 370. Positioning lock plate; 371. Through hole; 372. First mounting hole; 380. First bearing; 390. First washer; 410. Second bearing; 420. Second washer; 430. Nut; 440. Third washer; 450. Fixing cover. Detailed Implementation
[0041] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.
[0042] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein in the specification of the application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims and drawings of this application are intended to cover non-exclusive inclusion.
[0043] The term "embodiment" as used herein means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of the phrase "embodiment" in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.
[0044] In this article, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can mean: A exists, A and B exist simultaneously, or B exists. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.
[0045] The directional terms appearing in the following description refer to the directions shown in the figures and are not intended to limit the specific structure of this application. For example, in the description of this application, the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the figures. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.
[0046] Furthermore, the terms "first," "second," etc., in the specification and claims of this application or in the aforementioned drawings are used to distinguish different objects rather than to describe a specific order, and may explicitly or implicitly include one or more of the features.
[0047] In the description of this application, unless otherwise stated, "multiple" means two or more (including two), and similarly, "multiple groups" means two or more (including two groups).
[0048] In the description of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linkage" should be interpreted broadly. For example, "connection" or "linkage" in mechanical structures can refer to a physical connection, such as a fixed connection, for example, a connection fixed by a partition, such as a connection fixed by screws, bolts, or other partitions; a physical connection can also be a detachable connection, such as a snap-fit or interlocking connection; a physical connection can also be an integral connection, such as a connection formed by welding, bonding, or integral molding. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances. In circuit structures, "connection" or "linkage" can refer not only to a physical connection but also to an electrical connection or a signal connection. For example, it can be a direct connection, i.e., a physical connection, or an indirect connection through at least one intermediate element, as long as the circuit is connected; it can also refer to the internal connection of two elements. A signal connection can refer not only to a signal connection through a circuit but also to a signal connection through a medium, such as radio waves. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.
[0049] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings.
[0050] Figure 1 This is a schematic diagram of the structure of a drawer-type circuit breaker provided in an embodiment of this application, as shown below. Figure 1 As shown, the drawer-type circuit breaker provided in this application includes a crank 100, a circuit breaker body 200, and a drawer base 300.
[0051] Figure 2 This is a schematic diagram of the structure of a drawer seat provided in an embodiment of this application, combined with... Figure 1 and Figure 2 The crank handle 100 is connected to the worm gear 310 in the drawer seat 300, and the circuit breaker body 200 is connected to the slide plate 320 in the drawer seat 300.
[0052] The end of the crank handle 100 that connects to the worm gear 310 may have a hexahedral side, and the end of the worm gear 310 that connects to the crank handle 100 may have an internal hexagonal hole, with the hexahedral side fitting into the internal hexagonal hole. Therefore, by inserting the end of the crank handle 100 into and engaging with the internal hexagonal hole, the connection between the crank handle 100 and the worm gear 310 can be achieved.
[0053] Of course, the aforementioned hexahedral side can be located at the end of the worm 310, and the internal hexagonal hole can be located at the end of the crank handle 100. Based on this, the end of the crank handle 100 can be fitted onto the end of the worm 310, thereby achieving the connection between the crank handle 100 and the worm 310. This application does not limit the method of achieving the connection between the crank handle 100 and the worm 310.
[0054] In addition to the aforementioned worm gear 310 and slide plate 320, drawer base 300 also includes a rotating shaft 330, a half-gear 340, and a shift fork 350. The rotating shaft 330 is perpendicular to the worm gear 310, and its position in the axial direction of the worm gear 310 is fixed. The half-gear 340 and the shift fork 350 are both fixedly connected to the rotating shaft 330.
[0055] The slide plate 320 has a toothed hole 321. When the crank handle 100 drives the worm gear 310 to rotate relative to the bottom plate 360 in the drawer seat 300, the slide plate 320 moves axially relative to the worm gear 310. During the movement of the slide plate 320, the toothed hole 321 moves together with the slide plate 320. When the toothed hole 321 meshes with the half-gear 340, the half-gear 340 drives the rotating shaft 330 to rotate together. Then the rotating shaft 330 drives the shift fork 350 to rotate together. During the rotation of the shift fork 350, the shift fork 350 moves the circuit breaker body 200, causing the circuit breaker body 200 to move axially in the worm gear 310, thereby cranking the drawer seat 300 in or out.
[0056] For example, when the crank 100 drives the worm gear 310 to rotate clockwise, the slide plate 320 moves away from the crank 100, and the circuit breaker body 200 is pushed into the drawer seat 300. Conversely, when the crank 100 drives the worm gear 310 to rotate counterclockwise, the slide plate 320 moves towards the crank 100, and the circuit breaker body 200 is pushed out of the drawer seat 300.
[0057] It should be noted that the above examples do not constitute a limitation on the technical solution of this application. In a specific design, it can also be designed such that when the crank 100 is rotated counterclockwise, the circuit breaker body 200 is rocked into the drawer seat 300, and when the crank 100 is rotated clockwise, the circuit breaker body 200 is rocked out of the drawer seat 300.
[0058] The structural design of the drawer base 300 in this application makes it easier to slide the circuit breaker body 200 in and out when using the drawer-type circuit breaker containing the drawer base 300. The specific structure of the drawer base 300 provided in this application will be described in detail below with reference to the accompanying drawings.
[0059] Figure 3 yes Figure 2 For the sectional view along section AA, please refer to... Figures 1 to 3The drawer base 300 provided in this application may include a base plate 360, a slide plate 320, a positioning lock plate 370, a worm gear 310, and a first bearing 380. The slide plate 320 is slidably connected to the base plate 360 and is used to cooperate with the circuit breaker body 200.
[0060] Figure 4 This is a structural schematic diagram of a positioning locking plate provided in an embodiment of this application, combined with... Figures 1 to 4 The positioning locking plate 370 is fixedly connected to the base plate 360. The positioning locking plate 370 has a through hole 371 and a first mounting hole 372 that are interconnected. The first mounting hole 372 is farther away from the slide plate 320 relative to the through hole 371, and there is a first stepped surface between the first mounting hole 372 and the through hole 371. The worm gear 310 is partially inserted through the through hole 371 and the first mounting hole 372, and the end of the worm gear 310 near the slide plate 320 is threadedly connected to the slide plate 320.
[0061] The base plate 360 is a structural component located at the bottom of the drawer seat 300, used to provide mounting positions for structures such as the slide plate 320, the positioning lock plate 370, and the worm gear 310.
[0062] Figure 5 This is a schematic diagram of the structure of a skateboard provided in an embodiment of this application, such as... Figure 1 , Figure 2 and Figure 5 As shown, the slide plate 320 includes a first plate 322 and a second plate 323 that are substantially perpendicular to each other. The first plate 322 is in contact with the base plate 360, and the second plate 323 is substantially perpendicular to the axis of the worm gear 310. The base plate 360 may have a groove for the first plate 322 to move, so that the first plate 322 can move relative to the base plate 360 within the groove along the axis of the worm gear 310. Alternatively, the base plate 360 may not have a groove, but instead has a limiting structure, so that the first plate 322 can move along the axis of the worm gear 310 within the area defined by the limiting structure.
[0063] The first plate 322 is provided with the aforementioned toothed hole 321. The slide plate 320 cooperates with the circuit breaker body 200 through the toothed hole 321, the aforementioned half-gear 340, the aforementioned rotating shaft 330, and the aforementioned shift fork 350. The cooperation relationship between these components can be referred to the relevant description above, and will not be repeated here.
[0064] The second plate 323 is provided with a threaded hole, and the end of the worm gear 310 near the slide plate 320 is provided with an external thread. The second plate 323 and the worm gear 310 are connected by the engagement of the external thread and the threaded hole.
[0065] The positioning locking plate 370 is substantially perpendicular to the base plate 360. A strip may be provided on the side of the positioning locking plate 370 facing the base plate 360, and a slot may be provided on the base plate 360 opposite to the strip. The strip and slot are compatible; inserting the strip into the slot allows for a fixed connection of the positioning locking plate 370 to the base plate 360. Alternatively, the positioning locking plate 370 may also be fixedly connected to the base plate 360 by screws, snap-fitting, or other methods; this application does not limit this method.
[0066] The through hole 371 and the first mounting hole 372 on the positioning lock plate 370 are arranged along the axial direction of the worm gear 310, or in other words, along the moving direction of the circuit breaker body 200. The first mounting hole 372 is located on the side of the through hole 371 away from the slide plate 320, and the diameter of the first mounting hole 372 is larger than the diameter of the through hole 371, so that a first stepped surface is formed between the first mounting hole 372 and the through hole 371.
[0067] Figure 6 yes Figure 3 Enlarged view of part B, combined with Figure 3 , Figure 4 ,and Figure 6 The first bearing 380 is sleeved on the worm gear 310 and located in the first mounting hole 372. The side of the first bearing 380 facing the slide plate 320 makes rolling contact with the first step surface, and the side of the first bearing 380 facing away from the slide plate 320 makes rolling contact with the first limiting surface.
[0068] The inner ring of the first bearing 380 is tightly fitted with the worm gear 310, and the worm gear 310 rotates, causing the bearing to rotate as well. The outer ring of the first bearing 380 is tightly fitted with the wall of the first mounting hole 372 to provide support.
[0069] The first step surface is located on the positioning lock plate 370, which is fixedly connected to the base plate 360, so the position of the first step surface remains fixed. Based on this, the first step surface contacts the side of the first bearing 380 facing the slide plate 320, which can restrict the first bearing 380 from moving towards the slide plate 320 on the worm gear 310.
[0070] The first limiting surface is fixed in the axial direction of the worm 310. The first limiting surface contacts the side of the first bearing 380 facing away from the slide plate 320, which can restrict the first bearing 380 from moving away from the slide plate 320 on the worm 310. When the worm 310 rotates, the first limiting surface rotates with the worm 310.
[0071] In summary, the first bearing 380 is in contact with the first step surface and the first limiting surface on both sides, respectively. Restricted by the first step surface and the first limiting surface, the first bearing 380 can only rotate relative to the positioning locking plate 370, and cannot move relative to the positioning locking plate 370 axially along the worm gear 310. Thus, when the end of the worm gear 310 near the slide plate 320 is threadedly connected to the slide plate 320, once the worm gear 310 rotates, the slide plate 320 can move along the threads on the worm gear 310 to either rock the circuit breaker body 200 into the drawer seat 300 or rock the circuit breaker body 200 out of the drawer seat 300.
[0072] Based on the preceding description, the slide plate 320 moves towards the crank handle 100, and the circuit breaker body 200 is pushed out of the drawer seat 300. According to the relationship between action and reaction forces, when the circuit breaker body 200 is pushed out of the drawer seat 300, the worm gear 310 applies a force to the slide plate 320 in the direction of the crank handle 100, and the slide plate 320 applies a reaction force to the worm gear 310 in the direction away from the crank handle 100.
[0073] In this application, the side of the first bearing 380 facing the slide plate 320 makes rolling contact with the first step surface, and the side of the first bearing 380 facing away from the slide plate 320 makes rolling contact with the first limiting surface. In this way, the first bearing 380 separates the positioning locking plate 370 from the first limiting surface, avoiding direct contact between the first limiting surface and the positioning locking plate 370 and the sliding friction that would occur when the worm gear 310 rotates.
[0074] Importantly, when the slide plate 320 applies a reaction force to the worm gear 310 in a direction away from the crank handle 100, the first bearing 380 rotates with the worm gear 310. The friction between the side of the first bearing 380 facing the slide plate 320 and the first step surface is rolling friction rather than sliding friction, and the friction between the side of the first bearing 380 facing away from the slide plate 320 and the first limiting surface is rolling friction rather than sliding friction. Since rolling friction is less than sliding friction under the same conditions, when the worm gear 310 rotates to swing the circuit breaker body 200 out of the drawer seat 300, the frictional resistance of the first step surface and the first limiting surface to the first bearing 380 is relatively small, thus reducing the resistance to the rotation of the worm gear 310. This makes it easier to reduce the torque required to swing the circuit breaker body 200 out of the drawer seat 300, thereby saving effort.
[0075] In addition, when both the first step surface and the first limiting surface roll friction with the first bearing 380, the possibility of damage to interacting structural components such as the crank handle 100, worm gear 310, and positioning lock plate 370 when the circuit breaker body 200 is rocked out of the drawer seat 300 can be reduced.
[0076] Based on some measured data from this application, for a 4P type drawer-type circuit breaker, the torque required for the circuit breaker body 200 to be rolled out from the drawer base 300 can be reduced from 18N before the first bearing 380 was installed to 8N after the first bearing 380 was installed. For a 3P type drawer-type circuit breaker, the torque required for the circuit breaker body 200 to be rolled out from the drawer base 300 can be reduced from 12N before the first bearing 380 was installed to 6N after the first bearing 380 was installed.
[0077] It is evident that by adding a first bearing 380, this application can effectively reduce the torque required for the circuit breaker body 200 to be rocked out of the drawer seat 300.
[0078] In some possible designs, the depth of the first mounting hole 372 can be the same as the height of the first bearing 380. For example... Figure 3 and Figure 6 As shown, the side of the first bearing 380 away from the slide plate 320 is flush with the side of the positioning lock plate 370 away from the slide plate 320.
[0079] Wherein, the depth of the first mounting hole 372 is the axial dimension of the first mounting hole 372 in the worm 310, and the height of the first bearing 380 is the axial dimension of the first bearing 380 in the worm 310.
[0080] The depth of the first mounting hole 372 is set to be the same as the height of the first bearing 380, so that the first bearing 380 can be fully embedded in the first mounting hole 372 without occupying any additional space other than the first mounting hole 372, reducing the difficulty of adding the first bearing 380 within the limited original design space. Furthermore, since the first bearing 380 is fully embedded in the first mounting hole 372, the design of adjacent structural components such as the original first limiting surface can be maintained, reducing the cost of adding the first bearing 380. The addition of the first bearing 380 in this application does not affect the shape of any structural components in the drawer seat 300, making it highly operable and feasible.
[0081] In some possible designs, the worm 310 has an outer shoulder on its peripheral wall, and the first limiting surface can be configured such that the outer shoulder faces the side of the slide plate 320.
[0082] The outer shoulder is a raised edge provided on the peripheral wall of the worm 310. The outer shoulder is located axially between the positioning locking plate 370 and the end of the worm 310 away from the slide plate 320. When the first bearing 380 is located within the first mounting hole 372, the side of the first bearing 380 facing away from the slide plate 320 contacts the outer shoulder. Therefore, the side of the outer shoulder facing the slide plate 320 can serve as a first limiting surface to restrict the first bearing 380 from moving away from the slide plate 320 on the worm 310.
[0083] By using the side of the outer shoulder facing the skateboard 320 as the first limiting surface, it is not necessary to set an additional limiting structure to restrict the first bearing 380 from moving away from the skateboard 320 on the worm gear 310, which saves the number of parts used.
[0084] It should be noted that the dimensions of the outer shoulder can be set according to the dimensions of the first bearing 380. Optionally, the outer shoulder can be a ring-shaped structure similar to the first bearing 380, and the outer shoulder can completely cover the side of the first bearing 380 facing away from the slide plate 320. In this way, the outer shoulder can limit the movement of the first bearing 380 while also protecting it from impurities and other contaminants, thereby improving the service life of the first bearing 380.
[0085] In other possible designs, such as Figure 3 and Figure 6 As shown, the drawer seat 300 also includes a first washer 390, which is sleeved on the worm gear 310. The position of the first washer 390 in the axial direction of the worm gear 310 is fixed. The first limiting surface can be configured such that the first washer 390 faces the side of the slide plate 320.
[0086] The first washer 390 can be an annular rubber ring. The first washer 390 is sleeved on the worm 310 and tightly fitted with it, thus allowing the first washer 390 to rotate with the worm 310. Furthermore, the axial position of the first washer 390 on the worm 310 can remain fixed. Therefore, when the side of the first washer 390 facing the slide plate 320 contacts the first bearing 380, it can restrict the first bearing 380 from moving away from the slide plate 320 on the worm 310.
[0087] Furthermore, the outer diameter of the first washer 390 can be equal to the diameter of the first mounting hole 372. For example... Figure 4 and Figure 6 As shown, the outer ring of the first washer 390 is flush with the wall of the first mounting hole 372.
[0088] With this configuration, when the side of the first washer 390 facing the slide plate 320 contacts the first bearing 380, it can completely cover the side of the first bearing 380 facing away from the slide plate 320. In this way, the first washer 390 not only limits the position of the first bearing 380, but also protects the first bearing 380 from impurities and other influences, thereby extending the service life of the first bearing 380.
[0089] Please continue to refer to Figure 3 and Figure 6The drawer seat 300 may further include a second bearing 410 and a second washer 420. The second bearing 410 and the second washer 420 are sleeved on the worm gear 310. The side of the second bearing 410 facing away from the slide plate 320 is in rolling contact with the positioning lock plate 370, and the side of the second bearing 410 facing the slide plate 320 is in rolling contact with the second washer 420. The position of the second washer 420 in the axial direction of the worm gear 310 remains fixed.
[0090] The inner ring of the second bearing 410 and the second washer 420 are tightly fitted with the worm gear 310. When the worm gear 310 rotates, it drives the second bearing 410 and the second washer 420 to rotate together.
[0091] The second washer 420 can be a ring-shaped rubber ring. For example... Figure 3 and Figure 6 As shown, the drawer seat 300 may further include a nut 430, which is sleeved on the worm gear 310 and abuts against the side of the second washer 420 facing the slide plate 320, so that the axial position of the second washer 420 on the worm gear 310 remains unchanged. When the axial position of the second washer 420 on the worm gear 310 remains unchanged, when the second washer 420 contacts the side of the second bearing 410 facing the slide plate 320, it can restrict the movement of the second bearing 410 on the worm gear 310 towards the slide plate 320.
[0092] The outer diameter of the second washer 420 can be equal to the outer ring size of the second bearing 410. Thus, when the second washer 420 contacts the side of the second bearing 410 facing the slide plate 320, the second washer 420 can completely cover that side of the second bearing 410. In this way, the second washer 420 not only limits the movement of the second bearing 410 but also protects it from impurities, thereby extending its service life.
[0093] In this application, the side of the second bearing 410 facing away from the slide plate 320 makes rolling contact with the positioning lock plate 370, and the side of the second bearing 410 facing the slide plate 320 makes rolling contact with the second washer 420. In this way, the second bearing 410 separates the positioning lock plate 370 and the second washer 420, avoiding direct contact between the second washer 420 and the positioning lock plate 370 and the resulting sliding friction when the worm gear 310 rotates.
[0094] Furthermore, when the slide plate 320 applies a reaction force to the worm gear 310 in the direction close to the crank handle 100, the second bearing 410 rotates with the worm gear 310. The friction between the side of the second bearing 410 facing away from the slide plate 320 and the positioning lock plate 370 is rolling friction rather than sliding friction, and the friction between the side of the second bearing 410 facing the slide plate 320 and the second washer 420 is rolling friction rather than sliding friction. Since rolling friction is less than sliding friction under the same conditions, when the worm gear 310 rotates to push the circuit breaker body 200 into the drawer seat 300, the frictional resistance of the positioning lock plate 370 and the second washer 420 to the second bearing 410 is relatively small, thus reducing the resistance to the rotation of the worm gear 310. Therefore, it is easier to reduce the torque required to push the circuit breaker body 200 into the drawer seat 300, thus saving effort.
[0095] Furthermore, when both the positioning lock plate 370 and the second washer 420 are in rolling friction with the second bearing 410, the possibility of damage to interacting structural components such as the crank handle 100, worm gear 310, and positioning lock plate 370 can be reduced when the circuit breaker body 200 is rocked into the drawer seat 300.
[0096] Furthermore, such as Figure 3 and Figure 6 As shown, the drawer seat 300 may also include a third washer 440, which is sleeved on the worm gear 310. One side of the third washer 440 is in rolling contact with the second bearing 410, and the other side of the third washer 440 is in contact with the positioning lock plate 370.
[0097] The third washer 440 can be an annular rubber ring. The third washer 440 is sleeved on the worm gear 310, and its axial position is fixed. Therefore, when the third washer 440 contacts the side of the second bearing 410 facing away from the slide plate 320, it can restrict the second bearing 410 from moving closer to the slide plate 320. The third washer 440 can fill the gap between two adjacent structural components, reducing the precision requirements for the machining of the two adjacent structural components and facilitating correct assembly of the two structural components adjacent to the third washer 440.
[0098] Based on the preceding description, the slide plate 320 moves away from the crank handle 100, and the circuit breaker body 200 is pushed into the drawer seat 300. According to the relationship between action and reaction forces, when the circuit breaker body 200 is pushed into the drawer seat 300, the worm gear 310 applies a force to the slide plate 320 away from the crank handle 100, and the slide plate 320 applies a reaction force to the worm gear 310 in a direction closer to the crank handle 100.
[0099] In this embodiment, during the process of the circuit breaker body 200 being rocked into the drawer seat 300, the third washer 440 does not rotate with the worm gear 310. Therefore, the third washer 440 and the positioning lock plate 370 only have a contact relationship, and there is no rolling friction or sliding friction. The third washer 440 also has rolling contact with the second bearing 410. When the sliding plate 320 applies a reaction force to the worm gear 310 in the direction close to the crank handle 100, the second bearing 410 rotates with the worm gear 310. The side of the second bearing 410 facing away from the sliding plate 320 has rolling contact with the third washer 440. The friction is small and will not cause resistance to the rotation of the worm gear 310. Therefore, it is easy to reduce the torque required when the circuit breaker body 200 is rocked into the drawer seat 300, which has the effect of saving effort.
[0100] In some possible designs, the positioning locking plate 370 may also be provided with a second mounting hole, which is closer to the slide plate 320 than the first mounting hole 372, and a second stepped surface is provided between the second mounting hole and the through hole 371. The second bearing 410 is located in the second mounting hole, and the side of the second bearing 410 facing away from the slide plate 320 makes rolling contact with the second stepped surface.
[0101] The second mounting hole is located on the side of the through hole 371 near the slide plate 320. The diameter of the second mounting hole is larger than the diameter of the through hole 371, so that a second stepped surface is formed between the second mounting hole and the through hole 371.
[0102] The depth of the second mounting hole can be the same as the height of the second bearing 410, so that the second bearing 410 can be fully embedded in the second mounting hole to avoid occupying other space outside the second mounting hole.
[0103] The second step surface is located on the positioning lock plate 370, which is fixedly connected to the base plate 360, so the position of the second step surface remains fixed. Based on this, the second step surface contacts the side of the second bearing 410 facing away from the slide plate 320, which can restrict the second bearing 410 from moving away from the slide plate 320 on the worm gear 310.
[0104] The second bearing 410 is located within the second mounting hole, allowing it to be installed without occupying additional space outside the mounting hole, thus reducing the difficulty of installing the second bearing 410 in a small space. Since the second bearing 410 does not occupy additional space outside the mounting hole, space can be freed up for the installation of other structural components, facilitating their placement.
[0105] The structure of the second bearing 410 may be the same as that of the first bearing 380, or the structure of the second bearing 410 may be different from that of the first bearing 380. This application does not limit this.
[0106] For example, the first bearing 380 and the second bearing 410 are either planar rolling bearings or tapered bearings, the tapered bearings being similar to those used in automobile wheels. Specifically, both the first bearing 380 and the second bearing 410 can be planar rolling bearings. Alternatively, both the first bearing 380 and the second bearing 410 can be tapered bearings. Or, one of the first bearing 380 and the second bearing 410 can be a planar rolling bearing, and the other can be a tapered bearing.
[0107] Regardless of whether the first bearing 380 and the second bearing 410 are flat rolling bearings or tapered bearings, both the first bearing 380 and the second bearing 410 are provided with needle rollers on both sides of the worm 310 in the axial direction. Therefore, when the circuit breaker body 200 is pushed out of the drawer seat 300, the two sides of the first bearing 380 in the axial direction of the worm 310 can roll against the adjacent structural components to reduce the torque required for the circuit breaker body 200 to be pushed out of the drawer seat 300. When the circuit breaker body 200 is pushed into the drawer seat 300, the two sides of the second bearing 410 in the axial direction of the worm 310 can roll against the adjacent structural components to reduce the torque required for the circuit breaker body 200 to be pushed into the drawer seat 300.
[0108] It should be noted that the shapes of the first mounting hole 372 and the second mounting hole need to be adapted to the shapes of the first bearing 380 and the second bearing 410. For example, when the first bearing 380 and the second bearing 410 are planar rolling bearings, the first mounting hole 372 and the second mounting hole can be circular holes. When the first bearing 380 and the second bearing 410 are tapered bearings, the first mounting hole 372 and the second mounting hole can be tapered holes. Furthermore, the diameter of the first mounting hole 372 decreases from the crank handle 100 to the slide plate 320, and the diameter of the second mounting hole increases from the crank handle 100 to the slide plate 320, so that the first bearing 380 can reduce torque when the circuit breaker body 200 is rocked out of the drawer seat 300, and the second bearing 410 can reduce torque when the circuit breaker body 200 is rocked into the drawer seat 300.
[0109] Figure 7 This is a schematic diagram of another drawer seat provided in an embodiment of this application, as shown below. Figure 1 and Figure 7 As shown, the drawer base 300 may also include a fixing cover 450, which is fixedly connected to the base plate 360 and covers the slide plate 320.
[0110] Figure 7 The fixing cover 450 shown is fixedly connected to the base plate 360 by screws. In fact, the fixing cover 450 can also be fixedly connected to the base plate 360 by plugging, snapping, etc. This application does not limit this.
[0111] The fixed cover 450 is installed on the slide plate 320 and can guide the movement of the slide plate 320 in the axial direction of the worm 310. The fixed cover 450 also cooperates with the half gear 340 to limit the rotation angle of the half gear 340, thereby limiting the range of movement of the slide plate 320 in the axial direction of the worm 310.
Claims
1. A drawer seat, characterized in that, include: Base plate; A sliding plate is slidably connected to the base plate, and the sliding plate is used to cooperate with the circuit breaker body; A positioning locking plate is fixedly connected to the base plate. The positioning locking plate has a through hole and a first mounting hole that are interconnected. The first mounting hole is far away from the slide plate relative to the through hole. There is a first stepped surface between the first mounting hole and the through hole. A worm gear is partially inserted through the through hole and the first mounting hole, and the end of the worm gear near the slide plate is threadedly connected to the slide plate. A first bearing is sleeved on the worm and located in the first mounting hole. The side of the first bearing facing the slide plate makes rolling contact with the first stepped surface, and the side of the first bearing facing away from the slide plate makes rolling contact with the first limiting surface.
2. The drawer base of claim 1, wherein, The depth of the first mounting hole is the same as the height of the first bearing, and the depth of the first mounting hole is the axial dimension of the first mounting hole on the worm.
3. The drawer base according to claim 1 or 2, characterized in that, The worm gear has an outer shoulder on its peripheral wall, and the first limiting surface is configured such that the outer shoulder faces the side of the slide plate.
4. The drawer base according to claim 1 or 2, characterized in that, The drawer seat also includes a first washer, which is sleeved on the worm gear. The position of the first washer in the axial direction of the worm gear is fixed, and the first limiting surface is configured such that the first washer faces the side of the slide plate.
5. The drawer base according to claim 4, characterized in that, The outer diameter of the first washer is equal to the diameter of the first mounting hole.
6. The drawer base according to claim 4, characterized in that, The drawer seat also includes a second bearing and a second washer; The second bearing and the second washer are sleeved on the worm gear; The side of the second bearing facing away from the slide plate makes rolling contact with the positioning lock plate, and the side of the second bearing facing the slide plate makes rolling contact with the second washer. The position of the second washer in the axial direction of the worm gear remains fixed.
7. The drawer base according to claim 6, characterized in that, The positioning lock plate is also provided with a second mounting hole, which is closer to the slide plate than the first mounting hole, and a second stepped surface is provided between the second mounting hole and the through hole; The second bearing is located in the second mounting hole, and the side of the second bearing facing away from the slide plate makes rolling contact with the second step surface.
8. The drawer base according to claim 6, characterized in that, The drawer seat also includes a third washer, which is sleeved on the worm gear. One side of the third washer is in rolling contact with the second bearing, and the other side of the third washer is in contact with the positioning lock plate.
9. The drawer base according to claim 6, characterized in that, The first bearing and the second bearing are flat rolling bearings or tapered bearings.
10. A drawer-type circuit breaker, characterized in that, Includes a crank handle, a circuit breaker body, and a drawer base as described in any one of claims 1 to 9; The crank is connected to the worm gear in the drawer seat; When the crank handle drives the worm gear to rotate relative to the bottom plate in the drawer seat, the sliding plate moves relative to the worm gear, thereby shaking the circuit breaker body out of the drawer seat or shaking the circuit breaker body into the drawer seat.