Buffer, contact assembly and switching device

Abstract

The utility model relates to a buffer member, a contact assembly and a switch device. The switch device is provided with an action unit and a driving unit which is in driving joint with the action unit, the action unit and the driving unit are respectively provided with a joint end face, and the buffer piece is suitable for being connected to one of the driving unit and the action unit and abuts between the action unit and the driving unit in an elastic deformation mode. The buffer comprises: a base adapted to abut against the joining end face of the connected unit; the elastic arm extends out of the base part in a bent form and can elastically deform, and the elastic arm is suitable for being pressed between the action unit and the driving unit in an abutting mode; and the mounting part is provided with a connecting structure matched with the connected unit.

Description

Technical Field

[0001] The utility model relates to a switch electrical appliance, in particular to a buffer component, a contact assembly and a switch device. Background Art

[0002] A contactor is a typical switching device in which a moving contact can be driven by, for example, a driving mechanism to engage or disengage with a stationary contact. In this type of switching device, the moving contact is usually mounted on a movable bracket to form an action unit, and the action unit is connected to a driving unit (such as an armature in an electromagnetic mechanism). During the operation of the contactor, friction between the action unit and the driving unit is likely to occur at the joint due to the gap, causing wear on both. Over time, this can easily lead to problems such as unstable contactor closure and abnormal equipment operation, reducing the product's service life and causing safety hazards.

[0003] Therefore, there is a certain demand in the industry for improving the switch device to reduce the wear of the action unit and the drive unit. Utility Model Content

[0004] The utility model aims to provide a buffer component, which can at least solve some of the above technical problems.

[0005] The utility model also aims to provide a contact assembly using the improved buffer member.

[0006] The utility model also aims to provide a switch device using the improved contact assembly.

[0007] According to one aspect of the utility model, a buffer member for a switch device is provided, wherein the switch device has an action unit and a driving unit driving and engaging the action unit, and the action unit and the driving unit each have a coupling end face, the buffer member is suitable for being connected to one of the driving unit and the action unit and can be elastically deformed to rest between the action unit and the driving unit, the buffer member comprises: a base, suitable for resting on the coupling end face of the connected unit; an elastic arm, extending from the base in a bent form and being elastically deformable, wherein the elastic arm is suitable for being pressed between the action unit and the driving unit; and a mounting portion, having a connection configuration adapted to the connected unit.

[0008] The buffer provided by this solution is suitable for use between the action unit (such as a moving contact or a bracket for installing the moving contact) and the drive unit of a switch device (such as a contactor), and is particularly suitable for installation at the junction of the action unit and the drive unit. It can fill the matching gap between the two at the junction based on its own elastic deformation, and prevent the drive unit from generating friction at the junction of the two during the period when the action unit is driven to move, while not affecting the movement of the entire mechanism, and making the action mechanism and the drive mechanism cooperate more closely. Since the friction between the action unit and the drive unit is reduced or even eliminated, the wear of the two components can be reduced, the service life of the action unit and the drive unit can be greatly increased, and the operating stability of the switch device can be improved.

[0009] In some embodiments, two elastic arms extend from opposite sides of the base in opposite directions, and the two elastic arms are suitable for abutting between the action unit and the driving unit.

[0010] In some embodiments, the mounting portion includes two mounting arms arranged on opposite sides of the base and defining a receiving space for receiving the connected unit, wherein one of the mounting arms and the connected unit is formed with an opening, and the other is formed with a protruding buckle suitable for snapping into the opening.

[0011] In some embodiments, the two mounting arms are connected to opposite sides of the base, and the two mounting arms and the two elastic arms are alternately arranged around the circumference of the base.

[0012] In some embodiments, the two mounting arms are respectively connected to ends of the elastic arms on corresponding sides away from the base.

[0013] In some embodiments, the base has a mating protrusion adapted to fit into a recess of a connected unit.

[0014] In some embodiments, the base forms bent sections on opposite sides that are bent toward the connected unit.

[0015] In some embodiments, the buffer component is an integrally formed component.

[0016] According to another aspect of the utility model, a contact assembly for a switch device is provided, wherein the switch device has a drive unit, and the contact assembly includes a contact module and a buffer engaged with the contact module, wherein the contact module includes: a housing; a stationary contact mounted on the housing; a bracket movably mounted on the housing, wherein the drive unit is driven to engage with the bracket; a moving contact mounted on the bracket; wherein the buffer is the aforementioned buffer, wherein the base is engaged with the bracket, and the elastic arm is suitable for being pressed between the bracket and the drive unit.

[0017] According to another aspect of the utility model, a switch device is provided, comprising a fixed seat, wherein the switch device further comprises: a contact assembly, which is the aforementioned contact assembly, wherein the housing is mounted on the fixed seat; a drive unit, driving a bracket connected to the contact module; wherein the buffer member is pressed between the drive unit and the bracket.

[0018] Some of the other features and advantages of the present invention will be apparent to those skilled in the art after reading this application, and the other parts will be described in the following specific embodiments in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The embodiments of the present invention are described in detail below with reference to the accompanying drawings, wherein:

[0020] Figure 1 is a partial schematic diagram of a switch device according to an embodiment of the utility model;

[0021] Figure 2 is a partial schematic diagram of a switch device according to an embodiment of the utility model, wherein the fixing base is omitted and the joint between the bracket and the movable frame is exposed;

[0022] Figure 3 is a schematic diagram of a contact module according to a first embodiment of the utility model;

[0023] Figure 4 is a schematic diagram of the internal layout of a contact module according to the first embodiment of the utility model;

[0024] Figure 5 is a schematic diagram of a buffer member and a bracket assembled together according to a first embodiment of the utility model;

[0025] Figure 6 is a schematic diagram of a bracket according to a first embodiment of the utility model;

[0026] Figure 7 is a schematic diagram of a buffer according to a first embodiment of the utility model;

[0027] Figure 8 is a schematic diagram of a contact module according to a second embodiment of the utility model;

[0028] Fig. 9 is a schematic diagram of a buffer member and a bracket assembled together according to a second embodiment of the utility model;

[0029] Fig.10 It is a schematic diagram of a buffer according to a second embodiment of the utility model.

[0030] Description of reference numerals:

[0031] 1- switch device; 2- fixed seat; 3- contact module; 31- housing; 32- static contact; 33- moving contact; 34- bracket; 341- main body; 342- joint part; 343- through hole; 344- convex buckle; 345- end face; 35- back plate; 36- arc extinguishing mechanism; 4- driving unit; 41- movable frame; 42- receiving groove; 43- moving iron core; 5- buffer; 51- base; 511- convex part; 513- bending section; 52- elastic arm; 53- receiving space; 54- mounting arm; 541- first arm section; 542- second arm section; 543- opening DETAILED DESCRIPTION

[0032] Now, with reference to the accompanying drawings, schematic schemes of the buffer, contact assembly, and switch device disclosed in the utility model are described in detail. Although the drawings are provided to present some embodiments of the utility model, the drawings do not have to be drawn according to the dimensions of the specific embodiments, and certain features may be enlarged, removed, or partially cut away to better illustrate and explain the disclosure of the utility model. Some components in the drawings can be repositioned according to actual needs without affecting the technical effect. The phrase "in the drawings" or similar terms appearing in the specification do not necessarily refer to all drawings or examples.

[0033] Certain directional terms used to describe the drawings below, such as "inside", "outside", "above", "below" and other directional terms, will be understood to have their normal meanings and refer to those directions involved when the drawings are normally viewed. Unless otherwise specified, the directional terms described in this specification are basically in accordance with the conventional directions understood by those skilled in the art.

[0034] The terms "first", "first", "second", "second" and the like used in the present invention do not indicate any order, quantity or importance, but are used to distinguish one component from other components.

[0035] Figure 1 and Figure 2 A schematic diagram of a switch device according to an embodiment of the utility model is shown, and the switch device 1 can be, for example, a contactor or other switch device for controlling the on and off of a circuit. As shown in the figure, the switch device 1 includes a fixing base 2. The fixing base 2 can be a one-piece structure, or a split structure in which multiple parts can be detachably assembled together. Figure 1 A portion of the split fixing base 2 between the contact module 3 and the drive unit 4 is shown. In an embodiment where the switch device 1 is a contactor, the contact module 3 may be a main contact module, which as part of the main circuit may be installed near the bottom of the fixing base 2, and the drive unit 4 may be installed near the top of the fixing base 2.

[0036] The switch device 1 is equipped with a contact module 3, a drive unit 4, an arc extinguishing mechanism, a control module and other functional components on a fixed base 2. Figure 1 and Figure 2 As shown, three contact modules 3 are arranged in the transverse direction of the switch device 1. These contact modules 3 can be modular in design, thereby simplifying the installation and maintenance of the switch device 1.

[0037] Figure 3 and Figure 4 The first embodiment of a single contact module 3 and its internal layout is shown exemplarily. As shown in the figure, the contact module 3 includes a housing 31, and a static contact 32, a moving contact 33 and an arc extinguishing mechanism 36 are integrated in the housing 31. The housing 31 is configured for each contact module 3, and while realizing modular design, a better phase-to-phase insulation effect can also be provided for the circuit of the switch device 1 with the help of the housing. The arc extinguishing mechanism 36 includes a plurality of parallel arc extinguishing grids, and the housing 31 is formed with an opening for releasing the arc at a position corresponding to the arc extinguishing mechanism 36. One end of the static contact 32 is fixed in the housing 31 and is provided with a static contact point, while the other end of the static contact 32 extends from the housing 31 and is configured as a terminal at the extended end. The contact module 3 can also be connected to the fixed seat 2 through the extended end of the static contact 32. The moving contact 33 is supported by a bracket 34, and can move toward the static contact 32 and engage with the static contact 32 to achieve circuit closure, or separate from the static contact 32 and move away from the static contact 32 to achieve circuit disconnection. The bracket 34 can be arranged on the housing 31 perpendicular to the extension direction of the stationary contact 32, and can move relative to the housing 31. In the illustrated embodiment, a pair of stationary contacts 32 extend away from each other on opposite sides of the bracket 34. Accordingly, the moving contact 33 is movably mounted on the bracket and extends in the same direction as the stationary contact 32, and a moving contact for engaging with the stationary contact is provided at the extended end of the moving contact 33. During the movement of the bracket 34 in a direction substantially perpendicular to the stationary contact 32, the moving contact 33 can be driven to approach and engage with the stationary contact 32, or to separate from the stationary contact 32.

[0038] Figure 5 and Figure 6The bracket and the buffer member in the first embodiment are shown. As shown in the figure, the bracket 34 as a whole can be constructed into a hollow configuration, wherein the main body 341 thereof is located inside the housing 31, and the joint 342 for connecting to the drive unit 4 is located outside the housing 31 and connected to the main body 341. The bracket 34 can be an integrally formed part. The moving contact 33 is mounted on one end of the main body 341 of the bracket 34 that faces away from the joint 342. The size of the joint 342 is larger than the size of the main body 341, and is also larger than the size of the orifice formed on the housing 31 for the main body 341 to pass through. A supporting back plate 35 can also be provided on the side of the moving contact 33 that faces away from the static contact 32, and the back plate 35 basically extends across the entire length direction of the moving contact 33. While supporting the moving contact 33, the back plate 35 has its two ends in the length direction that each extend in a direction away from the moving contact 33, which can play the role of arc initiation when the moving and static contacts are disconnected, thereby optimizing the arc extinguishing effect.

[0039] The drive unit 4 can be arranged on the fixed seat 2 near the top and connected to the bracket 34. The drive unit 4 can use any suitable driving mechanism to control the movement of the bracket 34, so as to control the circuit to be closed or disconnected. In one embodiment, the drive unit 4 adopts an electromagnetic drive mechanism, wherein the static iron core and the coil are installed on the fixed seat 2, and the moving iron core 43 is installed on the movable frame 41, and the movable frame 41 is connected to the bracket 34 on which the moving contact 33 is installed. The energization of the coil is controlled by a control module electrically connected to the coil, thereby attracting the moving iron core to approach the static iron core, thereby pulling the bracket 34 and the moving contact 33 to move close to the static contact 32 through the movable frame 41. A reset spring can be set on the movable frame 41. When the coil is de-energized by the control module, the reset spring drives the moving iron core to move away from the static iron core, thereby driving the bracket 34 and the moving contact 33 to move away from the static contact 32.

[0040] like Figure 2 As shown, in order to achieve the connection, a receiving groove 42 is formed on the movable frame 41 of the driving unit 4, and the receiving groove 42 has a groove bottom and a groove wall surrounding the groove bottom, and the groove bottom is opposite to the groove opening of the receiving groove 42. The size of the receiving groove 42 is adapted to the size of the engaging portion 342 of the bracket 34, so as to allow the engaging portion 34 to be plugged into the receiving groove 42. The notch of the receiving groove 42 can be designed with a narrowing section, and the narrowing section can form a stopper match with the engaging portion 342 of the bracket 34 along the movement direction of the bracket 34, so as to prevent the engaging portion 342 inserted into the receiving groove 42 from escaping from the notch of the receiving groove 42. The groove wall of the receiving groove 42 can be discontinuous, so as to form an insertion interface, so as to allow the engaging portion 34 to be inserted into the receiving groove 42 via the insertion interface.

[0041] When the engaging portion 342 of the bracket 34 is inserted into the receiving groove 42 of the movable frame 41, a fitting gap is formed between the engaging portion 342 and the receiving groove 42. This fitting gap cannot be avoided through design or processing. The existence of the fitting gap will cause friction between the bracket 34 and the movable frame 41 during the period when the driving unit 4 drives the moving contact 33 to move, thereby causing wear and affecting the engagement of the moving contact 33 with the static contact 32. In order to overcome this problem, an elastically deformable buffer 5 is provided between the bracket 34 and the movable frame 41. "Elastically deformable" here means that the element can be deformed by external force and can return to its original shape after the external force disappears. The buffer 5 can make up for the fitting gap between the bracket 34 and the movable frame 41, so that the bracket 34 and the movable frame 41 form a tight fit, thereby reducing or even eliminating the wear caused by the relative movement of the bracket 34 and the movable frame 41.

[0042] Figure 7 The buffer member 5 according to the first embodiment of the utility model is shown. As shown in the figure, the buffer member 5 can be constructed as an integrally formed elastic sheet. The base 51 of the buffer member 5 is arranged corresponding to the end surface 345 of the joint portion 342 of the bracket 34 facing the movable frame 41 and rests on the end surface 345. Figures 3 to 5 The embodiment of assembling the buffer 5 with the bracket 34 on which the moving contact 33 is mounted is shown. As shown in the figure, the base 51 of the buffer 5 is connected with mounting arms 54 at its opposite ends, so as to form a clamp arm configuration to accommodate and connect the joint 342 of the bracket 34. To this end, the base 51 extends a mounting arm 54 at opposite sides. Each mounting arm 54 includes a first arm section 541 that is substantially flush with the base 51 and a second arm section 542 that is connected to the first arm section 541 at an angle. The two second arm sections 542 of the base 51 are arranged opposite to each other, and define a receiving space 53 therebetween for accommodating the joint 342 of the bracket 34. In one embodiment, the angle between the first arm section 541 and the second arm section 542 is 90 degrees. The two opposite second arm sections 542 can each form an opening 543, and form a corresponding convex buckle 344 at the joint 342 of the bracket 34. During assembly, the convex buckle 344 is embedded in the opening 543 on the corresponding side, so that the base 51 of the buffer 5 can be basically closely attached to the end surface 345 of the joint portion 342, thereby realizing the joint between the bracket 34 and the buffer 5. In other embodiments, the opening can be formed in the bracket 34, and the convex buckle can be formed in the mounting arm 54 of the buffer 5, so that the bracket and the buffer can also be snap-fitted. In addition, other suitable methods can be used to assemble the buffer 5 to the bracket 34, such as bolting, bonding, welding, etc.

[0043] A through hole 343 may be formed in the joint portion 342 of the bracket 34, and a convex portion 511 protruding toward the bracket 34 may be formed in the base 51 of the buffer 5. During assembly, the convex portion 511 may be embedded in the through hole 343 of the joint portion 342 to achieve positioning of the two.

[0044] In another embodiment not shown, the buffer member 5 can omit the mounting arm and be connected to the bracket 34 by other forms of mounting parts. For example, the buffer member 5 can extend a mounting wing from the base 51, and the mounting wing is fixed to the bracket by bolts, or the bracket is provided with a slit for inserting the mounting wing.

[0045] The main functional part of the buffer 5 to achieve the buffering effect is a pair of elastic arms or side wings 52 extending from opposite sides of the base 51. Figure 7 As shown, a pair of elastic arms 52 and a pair of mounting arms 54 are alternately arranged around the circumference of the main body 511 of the base 51. Each elastic arm 52 is configured as an arc-shaped spring sheet, wherein there is a gap between the arc-shaped curved portion and the end surface 345 of the bracket 34, and the arc top faces the movable frame 41, especially can support the bottom of the receiving groove 42 of the movable frame 41, so that the buffer 5 is pressed between the bracket 34 and the movable frame 41. With the help of the elastic deformation of the elastic arm 52, the changing gap between the movable frame 41 and the bracket 34 can be adapted, so that the movable frame 41 and the bracket 34 are closely matched. The integrally formed buffer 5 has reliable structural strength.

[0046] Although the figure shows an embodiment in which the buffer member 5 is assembled to the joint portion 342 of the bracket 34, those skilled in the art will understand that the buffer member 5 can also be assembled to the movable frame 41, for example, assembled to the bottom of the receiving groove 42 of the movable frame 41, so that it abuts against the joint portion 342 of the bracket 34. To this end, a convex buckle is formed on the movable frame 41 (for example, the groove wall of the receiving groove 42) for snapping into the opening 543 of the mounting arm 54 of the buffer member 5. Of course, here, an opening can also be formed on the movable frame 41, and a convex buckle can be formed on the buffer member 5, which can also achieve snap-fit ​​engagement between the movable frame and the buffer member.

[0047] As 8 to Fig.10 A schematic diagram of a single contact module 3 and a buffer 5 assembled therewith according to the second embodiment of the utility model is shown. As shown in the figure, the configuration and function of the contact module 3 in this embodiment are similar to those of the first embodiment, including a housing 31, a stationary contact 32, a moving contact 33, a bracket 34, a back plate 35 and an arc extinguishing mechanism 36. The details of the contact module 3 and its connection with the drive unit 4 can refer to the first embodiment and will not be described in detail here. The following mainly describes in detail the variation of the buffer 5 in the second embodiment.

[0048] As shown in the figure, the buffer member 5 as a whole is still an integrally formed elastic sheet. The base 51 of the buffer member 5 is arranged corresponding to the end surface 345 of the joint portion 342 of the bracket 34 facing the movable frame 41 and rests on the end surface 345. Specifically, the base 51 forms a bending section 513 bent toward the end surface 345 at two opposite ends, and the free end of the bending section 513 can rest on the end surface 345, so that in a natural state, a gap is formed between most of the base 51 and the end surface 345. An elastic arm 52 extends from each of the other two opposite ends of the base 51. As shown in FIG. Fig.10 As shown, two bent sections 513 and two elastic arms 52 are alternately arranged around the base 51. Each elastic arm 52 is configured to be bent and extended from the base 51 in an arc or curve shape, wherein one end of the elastic arm 52 away from the base 51 can lean against the engagement end surface 345 of the bracket 34, and a gap exists between the portion of the elastic arm 52 between the base 51 and the end and the engagement end surface 345.

[0049] A mounting arm 54 is connected to a side of the elastic arm 52 away from the base 51 . Fig. 9 An embodiment of assembling the buffer member 5 with the bracket 34 on which the moving contact 33 is mounted is shown. As shown in the figure, the two mounting arms 54 located on opposite sides of the base 51 are configured into a clamp arm configuration to accommodate and connect the joint 342 of the bracket 34. Each mounting arm 54 may include a first arm segment 541 connected to the elastic arm 52 on the corresponding side and a second arm segment 542 connected to the first arm segment 541 at an angle. The two second arm segments 542 of the base 51 are arranged opposite to each other, and define a receiving space 53 therebetween for accommodating the joint 342 of the bracket 34. In one embodiment, the angle between the first arm segment 541 and the second arm segment 542 is 90 degrees. The two opposite second arm segments 542 can each form an opening 543 and form a corresponding protrusion 344 at the joint 342 of the bracket 34. As shown in FIG. Fig. 9 As shown, during assembly, the convex buckle 344 is embedded in the opening 543 on the corresponding side, so that the base 51 of the buffer 5 can be basically closely fitted to the end surface 345 of the joint portion 342, thereby realizing the joint between the bracket 34 and the buffer 5. In other embodiments, the opening can be formed on the bracket 34, and the convex buckle can be formed on the mounting arm 54 of the buffer 5, which can also realize the snap joint between the bracket and the buffer. In addition, other suitable methods can be used to assemble the buffer 5 to the bracket 34, such as bolt joint, bonding, welding, etc.

[0050] In addition, in other embodiments, the buffer 5 may omit the mounting arm and be connected to the bracket 34 through other forms of mounting parts. For example, the buffer 5 may extend a mounting wing from the base 51, and the mounting wing may be fixed to the bracket by bolts, or the bracket may be provided with a slit for inserting the mounting wing.

[0051] It should be understood that although this specification is described according to various embodiments, not every embodiment contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0052] The above description is only an illustrative embodiment of the present invention and is not intended to limit the scope of the present invention. Any equivalent changes, modifications and combinations made by any technician in the field without departing from the concept and principle of the present invention shall fall within the scope of protection of the present invention.

Claims

1. A buffer for a switch device, wherein the switch device has an action unit and a driving unit for driving and engaging the action unit, and the action unit and the driving unit each have an engaging end surface, characterized in that: The buffer member (5) is suitable for being connected to one of the driving unit and the action unit and being elastically deformable and resting between the action unit and the driving unit. The buffer member (5) comprises: a base (51) adapted to rest against the engaging end surface of the connected unit; an elastic arm (52) extending from the base (51) in a bent state and capable of elastic deformation, wherein the elastic arm (52) is suitable for being pressed between the action unit and the drive unit; The mounting portion has a connection configuration adapted to the connected unit.

2. The buffer according to claim 1, characterized in that: Two elastic arms (52) extend from opposite sides of the base (51) in opposite directions, and the two elastic arms (52) are suitable for abutting between the action unit and the drive unit.

3. The buffer member according to claim 2, characterized in that: The mounting portion comprises two mounting arms (54) arranged on opposite sides of the base (51) and defining an accommodation space (53) for accommodating a connected unit, wherein one of the mounting arms (54) and the connected unit is formed with an opening (543), and the other is formed with a protruding buckle (344) suitable for being snapped into the opening (543).

4. The buffer member according to claim 3, characterized in that: The two mounting arms (54) are connected to opposite sides of the base (51), and the two mounting arms (54) and the two elastic arms (52) are alternately arranged around the circumference of the base (51).

5. The buffer member according to claim 3, characterized in that: The two mounting arms (54) are respectively connected to one end of the elastic arm (52) on the corresponding side away from the base (51).

6. The buffer according to any one of claims 1 to 5, characterized in that: The base (51) has a fitting protrusion (511) adapted to be inserted into a recess of a connected unit.

7. The buffer according to any one of claims 1 to 5, characterized in that: The base (51) forms bent sections (513) on opposite sides that are bent toward the connected unit.

8. The buffer according to any one of claims 1 to 5, characterized in that: The buffer component is an integrally formed component.

9. A contact assembly for a switch device, wherein the switch device has a drive unit, characterized in that: The contact assembly comprises a contact module (3) and a buffer member (5) engaged with the contact module (3), wherein the contact module (3) comprises: Shell (31); A stationary contact (32) mounted on the housing (31); a bracket (34) movably mounted on the housing (31), wherein the drive unit is drivingly engaged with the bracket (34); A moving contact (33) mounted on the bracket (34); The buffer member (5) is the buffer member (5) according to any one of claims 1 to 8, wherein the base (51) is engaged with the bracket (34), and the elastic arm (52) is suitable for being pressed between the bracket (34) and the drive unit.

10. A switch device, comprising a fixing seat (2), characterized in that: The switch device further comprises: The contact assembly is the contact assembly according to claim 9, wherein the housing (31) is mounted on the fixing seat (2); A drive unit (4) driving a bracket (34) connected to the contact module (3); The buffer member (5) is pressed between the drive unit (4) and the bracket (34).

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