Modular contactor

Abstract

A modular contactor comprises a lower module, a middle module and an upper module which are detachably connected in sequence from bottom to top, and the lower module is provided with a base and an arc extinguish chamber assembly. The middle module comprises a base, a static / moving contact assembly, a contact support and a moving iron core. The upper module comprises an upper cover and a static iron core assembly. The core improvement is that the base is provided with a first centering positioning structure used for restraining the motion center of the contact support, and the upper cover is internally provided with a second centering positioning structure used for restraining the installation center of the static iron core assembly. After the three modules are assembled, the two positioning structures act synergistically to automatically and forcibly limit the movement axis of the contact support to accurately coincide with the central axis of the static iron core assembly. The design ensures that the contactor can maintain the original centering precision and performance after repeated disassembly, assembly and maintenance, the contact does not need to be manually adjusted, and the problem of performance consistency after modular maintenance is fundamentally solved.

Description

Technical Field

[0001] This invention relates to the field of switching electrical equipment technology, and more specifically to a modular contactor. Background Technology

[0002] A contactor is an electrical device widely used in automatic control circuits. One of its core components is an electromagnetic system consisting of a stationary iron core, a moving iron core (armature), and a coil. When in operation, the coil is energized to generate a magnetic field, which drives the moving iron core to move toward and attract the stationary iron core, thereby actuating the contacts. When the coil is de-energized, the moving iron core returns under the action of a reaction force.

[0003] Contactors have many parts. When one part (such as the contact) is damaged, it is often necessary to disassemble multiple related parts or even the entire module. After repair, key parameters such as contact gap and overtravel need to be readjusted in a complicated process. This process is cumbersome, requires high skills from maintenance personnel, and makes it difficult to guarantee the consistency of performance after repair. Summary of the Invention

[0004] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a modular contactor.

[0005] To achieve the above objectives, the present invention provides the following technical solution: A modular contactor includes a lower module, a middle module, and an upper module that are detachably connected from bottom to top, wherein... The lower module includes a base with several phase wire channels and an arc-extinguishing chamber assembly installed in the phase wire channels. The arc-extinguishing chamber assembly is symmetrically arranged at both ends of each phase wire channel, and a space for the movable contact to move is formed between the two. The middle module includes a base, a stationary contact assembly and a moving contact assembly disposed on the lower side of the base, a contact support for driving the moving contact assembly to move relative to the stationary contact assembly, and a moving iron core linked with the contact support; The upper module includes an upper cover and a stationary iron core assembly disposed therein. The base is provided with a first centering positioning structure for constraining the contact support and keeping it in a predetermined center position during movement. The upper cover is provided with a second centering positioning structure for constraining the stationary iron core assembly and ensuring that it maintains a predetermined central position after installation. After the upper module, middle module and lower module are assembled, the first centering positioning structure and the second centering positioning structure jointly define that the motion axis supported by the contact coincides with the central axis of the stationary iron core assembly.

[0006] The first centering positioning mechanism includes: The symmetrically arranged sidewalls are formed by extending upwards from both ends of the central through hole; The first positioning groove is formed on the inner side of the side wall; The first positioning block is formed on both sides of the contact support and has a sliding fit with the first positioning groove.

[0007] The first positioning block is wrapped with a protective component made of self-lubricating material.

[0008] The mating surface between the first positioning groove and the first positioning block is a vertical plane perpendicular to the closing direction, which is used to limit the contact support from shifting in a plane perpendicular to the movement direction.

[0009] The second centering positioning structure includes: A second positioning groove formed on the wall of the mounting space of the upper cover; and The second positioning block is formed on both sides of the static iron core assembly and forms a positioning fit with the second positioning groove.

[0010] The upper cover is provided with a detachable cover plate to close the installation space; the periphery of the cover plate extends to form a pressure plate, and when the cover plate is installed in place, the pressure plate and the second positioning groove together clamp and fix the second positioning block.

[0011] The contact support includes a moving iron core fixing part located above the base and a plurality of moving contact support columns extending downward from the moving iron core fixing part and passing through the central through hole; the moving contact assembly is fixedly installed at the lower end of all the moving contact support columns; the lower surface of the moving iron core fixing part and the upper surface of the moving contact assembly define the movable distance of the contact support on the base.

[0012] The moving contact support column is provided with a mounting hole along its height direction, and the moving contact support column is also provided with a limiting hole, which is provided along the contact support length direction and passes through the mounting hole. The moving contact assembly includes: The fastener has a plate-like structure with both ends bent upwards and abutting at the top to enclose and form a clamping space; A movable contact bridge unit, which passes through the clamping space, includes a movable contact bridge and a support plate. The two sides of the movable contact bridge are bent downward to form side walls, and the support plate is located between the two side walls. An elastic element is disposed on the upper side of the clamping space; The positioning element has its two ends overlapping the limiting hole. When the fixing member is inserted into the mounting hole, the elastic member is restricted to the upper end of the clamping space by the positioning member, and the moving contact bridge unit is pressed against the bottom of the contact support column by the fixing member.

[0013] The stationary contact assembly includes: The stationary contact includes a terminal block and a stationary contact plate arranged parallel to each other, wherein one end of the terminal block and the stationary contact plate are connected by a first bend. An arc-starting plate includes a mounting portion and an extension portion arranged parallel to each other. One end of the mounting portion and the extension portion are connected by a second bending portion. The other end of the extension portion is bent downward to form an arc-starting portion extending to the outlet position of the arc-extinguishing chamber assembly. The mounting part is fixed to the lower surface of the terminal block, the extension part is provided with an opening groove, the other end of the stationary contact plate is accommodated in the opening groove, and the lower surface of the stationary contact plate is flush with the lower surface of the extension part.

[0014] A limiting part is formed on the second bending part, the limiting part is located above the opening groove, and its lower surface abuts against the upper surface of the stationary contact plate that is accommodated in the opening groove.

[0015] The beneficial effects of this invention are: With its three independent functional modules (upper, middle, and lower), when any component (such as the arc-extinguishing chamber, contacts, or coil) is damaged, only the corresponding module needs to be replaced, eliminating the need for complete disassembly and greatly reducing maintenance time and downtime losses.

[0016] Through a first centering positioning structure on the middle module and a second centering positioning structure on the upper module, the three modules are automatically guided and constrained to precisely align with the stationary iron core assembly during assembly, ensuring that their axes coincide. This design allows the contactor to maintain its original design accuracy regardless of how many times it is disassembled and repaired, without the need for manual adjustment, fundamentally solving the performance consistency problem after modular maintenance. Attached Figure Description

[0017] Figure 1 This is an exploded view of the present invention.

[0018] Figure 2 This is a cross-sectional schematic diagram of the present invention.

[0019] Figure 3 This is a front view of the module in this invention.

[0020] Figure 4 for Figure 3 Schematic diagram of the AA section.

[0021] Figure 5 This is a schematic diagram of the base structure of the present invention.

[0022] Figure 6 This is a structural schematic diagram of the base of the present invention from another angle.

[0023] Figure 7 This is an enlarged view of the structure supporting the contact.

[0024] Figure 8 This is a schematic diagram of the structure of the moving iron core fixing part.

[0025] Figure 9 This is a schematic diagram of the internal structure of the upper module.

[0026] Figure 10 This is a schematic diagram of the upper cover.

[0027] Figure 11 This is a schematic diagram of the cover plate.

[0028] Figure 12 This is a schematic diagram showing the fit between the second positioning block and the second positioning groove.

[0029] Figure 13 This is an enlarged schematic diagram of the second positioning slot.

[0030] Figure 14 This is a schematic diagram of the static iron core assembly.

[0031] Figure 15 for Figure 14 Enlarged diagram of point B in the middle.

[0032] Figure 16 This is a cross-sectional schematic diagram of the moving and stationary contacts.

[0033] Figure 17 This is a schematic diagram of the moving contact assembly.

[0034] Figure 18 This is a schematic diagram of the moving contact bridge unit.

[0035] Figure 19 This is a schematic diagram of the stationary contact assembly.

[0036] Figure 20 This is a schematic diagram of the structure when the two parts of the stationary contact assembly are separated.

[0037] Figure 21 This is a schematic diagram of the lower module.

[0038] Figure 22 This is the main view of the lower module.

[0039] Figure 23 This is a schematic diagram of the deflection component.

[0040] Figure 24 This is a schematic diagram of the nut retainer. Detailed Implementation

[0041] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0042] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain a specific posture (as shown in the attached figure), where the X and Y directions are as follows: Figure 21 The coordinates are shown in the diagram.

[0043] like Figure 1 As shown, the present invention discloses a modular contactor, which includes a lower module 100, a middle module 200 and an upper module 300 that are detachably connected from bottom to top, and the three are detachably connected by clips or screws.

[0044] like Figure 2 , Figure 21 and Figure 22 As shown, the lower module 100 mainly includes a base 110 and an arc-extinguishing chamber assembly 120. The base 110 is made of insulating material and has three independent phase wire channels 111 inside, corresponding to the three-phase power supply. Each phase wire channel 111 has a partition 112 at both ends, and the lower part of the partition 112 has a vent hole 113, which provides a direct and smooth discharge channel for the high-temperature and high-pressure gas generated during the arc extinguishing process, helping to reduce the pressure and temperature inside the arc-extinguishing chamber. The arc-extinguishing chamber assembly 120 is symmetrically installed at both ends of each phase wire channel, and the space between them forms a space for the movable contact to move.

[0045] The arc-extinguishing chamber assembly 120 consists of multiple parallel, insulated arc-extinguishing grid plates, correspondingly positioned on both sides of each phase line channel 111 and located inside the partition plate 112. Each arc-extinguishing grid plate has a wavy arc-cutting groove on its upper edge. These grooves effectively divide, elongate, and cool the arc, further enhancing the arc-extinguishing capability. The arc-cutting grooves are arranged alternately or coaxially to form arc-extinguishing channels. In this embodiment, the arc-cutting grooves are arranged correspondingly; in some embodiments, they can be arranged alternately for better arc-cutting.

[0046] Meanwhile, the space in the middle can be used to install and set the deflection component 130, such as Figure 23 As shown, it is formed by stamping and bending conductive metal sheets, and its manufacturing process is simple and low-cost.

[0047] The deflector 130 includes: A first arc-drawing portion 131 and a second arc-drawing portion 132 extend along a second direction perpendicular to the first direction and are arranged parallel to each other; A substrate 133 extends along a first direction and is biasedly connected between a first arc-starting portion 131 and a second arc-starting portion 132 in a second direction; The first connecting portion 134 connects the substrate 133 and the first arc-leading portion 131. The second connecting portion 135 connects the substrate 133 and the second arc-leading portion 132. The substrate 133, the first connecting portion 134 and the second connecting portion 136 are formed with a hollow portion 136 that can accommodate the moving contact assembly 240. The upper ends of the first arc-inducing portion 131 and the second arc-inducing portion 132 are provided with arc-inducing grooves 137 for introducing the electric arc into the corresponding arc-extinguishing chamber assembly.

[0048] The hollowed-out design serves two purposes: firstly, it does not affect the movement path of the moving contact, and secondly, it reduces weight and saves materials.

[0049] The arc-initiating groove is V-shaped or U-shaped and is directly formed on the upper end of the first or second connecting part. It is set in correspondence with the arc-extinguishing channel, so that the electric arc can be introduced into the arc-extinguishing channel through the arc-initiating groove in a better and faster manner.

[0050] The side plates at both ends of the phase line channel 111 are provided with several slots 115 arranged along the first direction, and each arc-extinguishing grid plate is sequentially inserted and fixed in the corresponding slot 140. Figure 21 As shown, to improve the reliability of the fixing, protrusions can be provided on the front and rear sides of the arc-extinguishing grid. When the arc-extinguishing grid is inserted into the slot 115, the protrusions and the slot wall form an interference fit, effectively preventing the grid from loosening. The arc-extinguishing grid is installed through the slot, and the protrusions on it, combined with the interference fit with the slot, achieve double fixing, effectively preventing the grid from loosening or shifting under arc impact or vibration, ensuring the long-term stability and consistency of the arc-extinguishing chamber assembly, thereby maintaining long-lasting arc-extinguishing performance.

[0051] The first arc-initiating part 131 and the second arc-initiating plate 132 are respectively inserted into the slot 115 located at the foremost end of the arc-extinguishing grid plate. In this embodiment, the foremost end refers to the direction in which the arc-extinguishing grid plate groups on both sides face the deflector.

[0052] The inner wall of the partition 112 is provided with a plurality of reinforcing ribs 114 extending along the second direction, and the reinforcing ribs 114 divide the vent hole into a plurality of sub-vent holes 113. These reinforcing ribs enhance the structural strength of the partition while also dividing the vent hole into a plurality of smaller sub-vent holes, making the airflow distribution more uniform.

[0053] The top of the substrate 133 is lower than the highest point of the first connecting part 134 and the second connecting part 135, and higher than the lowest point of the first connecting part 134 and the second connecting part 135. As a result, when the moving and stationary contacts separate, their arcs are attracted by the first arc-inducing part and the second arc-inducing part, and thus they quickly pass through the arc-inducing groove and enter the arc-extinguishing channel.

[0054] The phase line channel 111 has a support block 116 on its side wall for supporting the substrate 330. The two sides of the substrate overlap the support block to obtain stable support.

[0055] Positioning blocks 117 are provided between the support blocks 116. These positioning blocks connect to the positioning blocks on both sides and cooperate with the slots to position the arc-initiating part and the connecting part of the deflector. This allows for quick and accurate installation, and the deflector is restricted in the first direction, preventing movement. The deflector is inserted into the first slot of the arc-extinguishing grid assembly through its arc-initiating part. Simultaneously, the base plate is supported by support blocks on the side wall of the base, and the positioning blocks further restrict its position, ensuring accurate and secure installation of the deflector. To ensure reliable fixation in the second direction, protrusions are provided on the front and rear sides of the arc-initiating part, forming an interference fit with the slots.

[0056] The highest surface of the positioning block 117 is lower than the highest surface of the support block 116, and the positioning block is lower than the lowest end of the hollow part, so it does not interfere with the hollow part.

[0057] like Figure 2 , Figure 3 and Figure 4 As shown, the middle module 200 is the core functional module of the present invention. It includes a base 210, which is made of insulating material. The base has a through hole 213 in the center. In this embodiment, the through hole is divided into three sub-through holes, which are respectively set for the moving contact support columns of different phases supported by the contacts. A stationary contact assembly 230 is fixedly provided below the base. The moving contact assembly 240, the contact support 220 that drives the moving contact assembly 240 to move relative to the stationary contact assembly 230, and the moving iron core 250 that is linked with the contact support 220 constitute a whole.

[0058] The base 210 is provided with a first centering positioning structure for constraining the contact support 220 and maintaining it at a predetermined center position during movement, such as... Figure 3 and Figure 4 As shown.

[0059] The periphery of the central through-hole located in the middle extends upward to form sidewalls 211 at both ends (the front and rear refer to the front and rear directions of the phase line channel). The height of the sidewalls is preferably designed to cover the maximum operating stroke of the contact support, ensuring that the contact support remains centered in any state. Figure 5 and Figure 6 As shown. A gap is formed between the side walls on both sides to accommodate the contact support, that is, the side wall is in the form of three sides surrounding one side and one side opening. A vertically arranged first positioning groove 212 is machined on any one side or the two symmetrical side walls. The contact support is integrally formed by the moving iron core fixing part 224 and the moving contact support column 225, as shown. Figure 7 and Figure 8 As shown, the moving contact support column passes through the central through hole, and the moving iron core fixing part is located on the upper side of the base. The moving iron core fixing part 224 has outwardly protruding first positioning blocks 221 on both sides. The first positioning blocks 221 and the first positioning groove 212 cooperate to form a first centered positioning structure. During assembly, the first positioning blocks 221 precisely slide into the first positioning groove 212, thereby ensuring that the contact support on the base can only move vertically and is always at the geometric center of the central through hole, without any lateral displacement.

[0060] That is, the mating surface of the first positioning groove 212 and the first positioning block 221 is a vertical plane perpendicular to the closing direction, which is used to limit the contact support 220 from shifting in a plane perpendicular to the movement direction. The moving iron core 250 is fixedly connected to the moving iron core fixing part 224 via a connecting rod 280 arranged along the width direction of the contact support 220. The connecting rod passes through the moving iron core, thereby making the moving iron core and the contact support form a whole and can move synchronously. At the same time, the fixing method is simple and easy to install, and it is also convenient for subsequent disassembly.

[0061] The contact support 220 is provided with protective members 223 on both sides, such as Figure 8 As shown, the protective element 223 covers the portion of the contact support 220 that slides in contact with the side wall. This protective element is made of a self-lubricating material, such as POM, to reduce friction and wear. Since the first positioning block of the contact support contacts the first positioning groove on the inner side wall, the protective element on its surface allows the first positioning block to slide in contact with the groove wall of the first positioning groove through the protective element. This prevents wear caused by prolonged use, thereby extending the overall service life and avoiding centering deviation due to wear.

[0062] The contact support 220 has bayonets 229 on both its front and rear ends. The protective member 223 has its ends bent and embedded in the bayonets 229. This bayonet-embedding method simplifies the fixing process. Simultaneously, the first positioning block has a positioning post 228 at its center, with an annular groove 222 around its circumference. The protective member 223 has a corresponding wall 223 that can be embedded in the annular groove 222. This ensures that the two will not shift and that they are always in contact with the first positioning groove through the protective member. Furthermore, the first positioning groove also has a clearance groove 21 at its center to avoid the positioning post.

[0063] like Figure 8 As shown, a plurality of first buffer members 260 are provided between the moving iron core fixing part 224 and the moving iron core. The first buffer members are integrally molded from elastic materials such as rubber or silicone. Each first buffer member 270 includes a base plate and a plurality of columnar support members integrally molded with the base plate. The moving iron core fixing part 224 is provided with a mounting groove 228, and the base plate is embedded in the mounting groove 228. The upper end of each columnar support member contacts the lower end face of the moving iron core. By being positioned between the moving iron core and the moving iron core fixing part 224, it serves to reduce the vibration and impact between the two.

[0064] like Figure 6 As shown, a second buffer 260 is provided between the mounting surface of the base and the contact support 220. Also made of elastic material, the second buffer 260 has a buckle 261 at its bottom and a slot 215 on its mounting surface. The buckle 261 and the slot 215 engage to allow for detachment of both while ensuring the reliable fixation of the second buffer.

[0065] The moving iron core fixing part 224 has parallel support arms 226 on both sides for fixing the return spring. The bottom of the upper cover 310 above the moving iron core has a positioning groove that cooperates with the support arms 226. The positioning points and positioning grooves on the support arms limit the position of the return spring, and also ensure that the return spring will never shift its position.

[0066] The outer side of the support arm 226 extends upward to form a linkage arm 227. The upper end of the linkage arm is provided with a linkage hole. The design of two linkage arms makes it easy to add functional accessories. When the drive shaft of the functional accessory is inserted into the linkage hole of the corresponding linkage arm, the action of the contact support drives the corresponding functional accessory to move.

[0067] Meanwhile, the moving contact assembly 240 is fixedly installed at the lower end of all moving contact support columns 225; the lower surface of the moving iron core fixing part 224 and the upper surface of the moving contact assembly 240 define the movable distance of the contact support 220 on the base 210.

[0068] The moving contact support column 225 is provided with a mounting hole 2254 along its height direction. The moving contact support column 225 is also provided with a limiting hole 2253, and the limiting hole 2253 is provided along the length direction of the contact support 220 and passes through the mounting hole 2254. like Figure 16 and Figure 17 As shown, the moving contact assembly 240 includes: The fastener 241 is a plate-shaped metal part, formed by stamping. Its two ends are bent upward and abut against each other at the top, thereby forming a clamping space that is closed or nearly closed at the top. The upper width of the fastener 241 can be designed to be smaller than the lower width to form a guide structure that facilitates insertion into the mounting hole 2254.

[0069] The movable contact bridge unit is disposed in the clamping space. It includes a movable contact bridge 244 and a support plate 245. The movable contact bridge 244 is bent downward on both sides to form side walls 2441. The support plate 245 is located between the two side walls 2441. The support plate is used to increase the strength of the movable contact bridge. At the same time, the two side walls limit the support plate in the Y direction.

[0070] The elastic element 242 is disposed on the upper side of the clamping space. It is a spring, located below the top abutment of the fixing element, and is restricted to the upper side of the installation space by the positioning element.

[0071] The positioning element 243 has its two ends overlapping the limiting hole 2253. It is used to restrict the elastic element during assembly to prevent the elastic element from affecting the assembly during subsequent installation.

[0072] When the fixing member 241 is inserted into the mounting hole 2254, the elastic member 242 is restricted by the positioning member 243 at the upper end of the clamping space, and the moving contact bridge unit is pressed against the bottom of the contact support column 225 by the fixing member 241.

[0073] The bottom of the moving contact support column 225 is provided with a notch 2251. The shape of the notch is adapted to the moving contact bridge. The notch is used to accommodate and limit the moving contact bridge to prevent it from shifting in the width direction. The two notches at the front and back can ensure that the moving contact bridge is always set along the X direction.

[0074] like Figure 18 As shown, the side wall 2441 has steps 2442 at both the front and rear ends, and the support plate is bent downward at both the front and rear ends to form limiting parts 2451. The limiting parts and the steps form a limiting fit. When the support seat is set in the moving contact bridge, the limiting parts at both the front and rear ends cooperate with the steps to limit in the X direction, so that the two form a whole.

[0075] The support plate is bent downwards on both sides to form side plates, and the side plates are provided with positioning grooves 2452 that are adapted to the fixing component. The positioning grooves 2452 are adapted to the plate body of the fixing component and play a positioning role.

[0076] An installation gap 2252 is provided above the limiting hole 2253. During normal assembly, after the fixing component and the elastic component are installed into the installation hole, a tool, such as a screwdriver, is inserted into the limiting hole. By pressing the elastic component upward, the screwdriver is embedded in the installation gap, leaving a limiting hole for the positioning component to be inserted. After the positioning component is inserted into place, the screwdriver is removed, and the elastic component will naturally return to its original position and press against the positioning component. At the same time, the two ends of the positioning component overlap with the limiting hole, which plays a limiting role. At this time, the force of the spring acts on the fixing component, so that the three components and the contact seat form a whole.

[0077] The positioning component includes a support portion 2432 for supporting the elastic component and limiting portions 2431 symmetrically arranged at both ends of the support portion. The width of the limiting portions 2431 is smaller than the width of the support portion 2432, thereby increasing the area of ​​the support portion to better support the elastic component. Simultaneously, the positioning component has a positioning protrusion on its upper side, which serves to position the elastic component.

[0078] After completing the installation of the positioning, fixing, and elastic components, simply assemble the moving contact bridge and the support plate together. Then, by pressing down on the fixing component, a certain gap is formed between the fixing component and the lower end face of the mounting hole. At this point, the entire moving contact bridge unit can be inserted. By releasing the downward pressure on the fixing component, the fixing component naturally moves upward under the action of the elastic component, thereby tightly fitting the moving contact bridge unit against the bottom of the contact seat. The notch also provides space and limits for the moving contact bridge.

[0079] like Figure 19 and Figure 20 As shown, the stationary contact assembly 230 includes: The stationary contact 231 includes a terminal block 2311 and a stationary contact plate 2312 arranged parallel to each other. One end of the terminal block 2311 and the stationary contact plate 2312 are connected by a first bend. The arc-starting plate 232 includes a mounting portion 2321 and an extension portion 2322 arranged parallel to each other. One end of the mounting portion 2321 and the extension portion 2322 are connected by a second bending portion 2324. The other end of the extension portion 2322 is bent downward to form an arc-starting portion 2323 extending to the outlet position of the arc-extinguishing chamber assembly 120. The mounting part 2321 is fixed to the lower surface of the terminal block 2311. The extension part 2322 is provided with an opening groove 2324. The free end of the stationary contact plate 2312 is accommodated in the opening groove 2324. The lower surface of the stationary contact plate 2312 is flush with the lower surface of the extension part 2322 to form a good conductive contact surface.

[0080] A limiting portion 2325 is formed on the second bending portion 2324. The limiting portion 2325 is located above the opening groove 2324, and its lower surface abuts against the upper surface of the stationary contact plate 2312 housed within the opening groove 2324. This "upward pressing" structure firmly fixes the stationary contact plate, preventing it from loosening or warping under electric repulsion, thus ensuring the stability of the contact area. Simultaneously, during assembly, when it is installed in place, the extension of the arc-starting plate is necessarily flush with the stationary contact plate, better guiding the arc at the stationary contact point away through the arc-starting plate.

[0081] Meanwhile, the end of the mounting part bends upward to form two positioning protrusions 2326, and the two sides of the terminal block are recessed to form mating grooves 2313. When the arc-starting plate and the stationary contact are combined, when they are installed in place, the positioning protrusions contact the groove wall of the mating groove, so as to more intuitively understand that the current mating is in place. Both can be tightened with screws.

[0082] like Figure 9 As shown, the upper module 300 includes an upper cover 310 and a stationary iron core assembly 320 disposed therein. A cover plate 330 and an upper cover 400 are sequentially provided on its upper side. The upper cover has an installation space in the center, in which the stationary iron core assembly is installed. At the same time, functional module installation spaces are provided on the front and rear sides of the installation space. The upper cover covers the entire upper opening of the upper cover. This design allows the upper cover to be opened only when the functional module needs to be replaced. Since the stationary iron core assembly is covered by the cover plate, the replacement of the functional module will not affect the stationary iron core assembly.

[0083] The stationary iron core assembly in this embodiment includes a U-shaped stationary iron core (such as...). Figure 14 As shown in the figure, a coil assembly is disposed in the opening of the stationary iron core, while the moving iron core is T-shaped and inserted into the opening of the stationary iron core.

[0084] like Figure 10 As shown, the upper cover serves as the main frame, with a through mounting hole 311 in the middle to form an installation space. The upper cover 310 is provided with a second centering positioning structure to constrain the static iron core assembly 320 and keep it in a predetermined center position after installation. At least two sets of second positioning grooves 312 are integrally formed on the upper ends of the two inner sidewalls opposite to the mounting hole. The two inner sidewalls opposite to each other are on both sides of the inlet and outlet direction. Each set of second positioning grooves consists of two grooves, which are spaced apart on the upper end of the same inner sidewall.

[0085] The stationary iron core is disposed in the mounting hole 311. Connecting rods 322 are fixed on both sides of the stationary iron core by means of interference fit or riveting. In this embodiment, the connecting rod is disposed through the entire stationary iron core, with both ends partially exposed. The exposed ends are respectively provided with second positioning blocks 321. In this embodiment, a sleeve made of elastic material is sleeved on the outside of the connecting rod.

[0086] Furthermore, the bottom of the second positioning block 321 extends downward to form a protrusion 324, such as Figure 15 As shown, the lower end of the protrusion 324 abuts against the coil frame 323, and its side is installed in the second positioning groove. When the stationary iron core is installed into the cover, the second positioning blocks on both sides are partially embedded in the second positioning groove. At the same time, when the protrusion at its bottom is in complete contact with the bottom of the second positioning groove, it just abuts against the upper surface of the coil frame, so that there is always a gap between the coil frame and the stationary iron core.

[0087] like Figure 11 As shown, a cover plate 330 is placed over the mounting hole, and its two sides extend to form pressure plates 331 that are inserted into the second positioning groove. The pressure plates 331 and the groove wall of the second positioning groove together clamp the second positioning block, thus constituting axial limitation. That is, when the cover plate is installed in place, the pressure plates are precisely engaged in the second positioning groove and press down on the second positioning block from above. Together with the groove wall of the second positioning groove, they restrict the movement of the second positioning block in the vertical direction, thereby achieving axial limitation.

[0088] like Figure 12 As shown, the cross-section of the second positioning block is rectangular, which fits perfectly with the second positioning groove. The planar support ensures that the stationary iron core has a support point. At the same time, each of the top corners of the second positioning block is rounded to reduce sharp edges and facilitate installation.

[0089] like Figure 13 As shown, the outer side wall of the upper cover corresponding to the bottom of the second positioning groove is provided with reinforcing ribs 314, which can improve the strength of the support groove and limit the coil frame to ensure that the static iron core assembly is always centered.

[0090] The upper cover has slots 313 on the front and rear end walls of the mounting hole, and corresponding snap-fit ​​parts 332 are provided at the front and rear ends of the cover plate. The snap-fit ​​parts 332 are embedded in the slots 313 to achieve a fixed connection. The snap-fit ​​part is a downwardly extending protrusion that fits perfectly into the slot and is locked with screws. Its height ensures that the pressure cover can firmly fix the second positioning block.

[0091] That is, after the upper module 300, the middle module 200 and the lower module 100 are assembled, the first centering positioning structure and the second centering positioning structure jointly define that the motion axis of the contact support 220 coincides with the central axis of the stationary iron core assembly 320.

[0092] In this embodiment, nut retainers 500 are also provided at both ends of the base, such as... Figure 24As shown, it is located on the outside of the partition. The nut retainer 500 includes a body with a nut mounting hole that restricts the rotation of the nut. Its rear end is recessed inward to form a stepped surface. A buckle is provided on the stepped surface. A limiting rib is provided at the corresponding position of the base. The buckle and the limiting rib cooperate to form a limiting in the X direction, so that when the wiring screw on the terminal block above it is threaded with the nut, the nut retainer will move upward.

[0093] Meanwhile, the snap-fit ​​design allows the nut retainer to be inserted even if it is found to be missing after assembly, without the need for disassembly and reassembly.

[0094] The embodiments should not be regarded as limitations on the present invention, but any improvements made based on the spirit of the present invention should be within the protection scope of the present invention.

Claims

1. A modular contactor, characterized in that: It includes a lower module (100), a middle module (200), and an upper module (300) that are detachably connected from bottom to top, wherein, The lower module (100) includes a base (110) having several phase wire channels and an arc-extinguishing chamber assembly (120) installed in the phase wire channels. The arc-extinguishing chamber assembly (120) is symmetrically arranged at both ends of each phase wire channel, and a space for the movable contact to move is formed between them. The middle module (200) includes a base (210), a stationary contact assembly (230) and a moving contact assembly (240) disposed on the lower side of the base (210), a contact support (220) that drives the moving contact assembly (240) to move relative to the stationary contact assembly (230), and a moving iron core (250) that is linked with the contact support (220). The upper module (300) includes an upper cover (310) and a static iron core assembly (320) disposed therein. The base (210) is provided with a first centering positioning structure for constraining the contact support (220) so that it maintains a predetermined center position during movement. The upper cover (310) is provided with a second centering positioning structure for constraining the static iron core assembly (320) so that it maintains a predetermined center position after installation. After the upper module (300), middle module (200) and lower module (100) are assembled, the first and second centering positioning structures jointly define the motion axis of the contact support (220) to coincide with the central axis of the stationary iron core assembly (320).

2. The modular contactor according to claim 1, characterized in that: The first centering positioning mechanism includes: The symmetrically arranged sidewalls (211) are formed by extending upwards from both ends of the central through hole (213); A first positioning groove (212) is formed on the inner side of the sidewall (211); The first positioning block (221) is formed on both sides of the contact support (220) and forms a sliding fit with the first positioning groove (212).

3. The modular contactor according to claim 2, characterized in that: The first positioning block (221) is wrapped with a protective element (223) made of self-lubricating material.

4. The modular contactor according to claim 2 or 3, characterized in that: The mating surface between the first positioning groove (212) and the first positioning block (221) is a vertical plane perpendicular to the closing direction, which is used to limit the contact support (220) from shifting in a plane perpendicular to the movement direction.

5. The modular contactor according to claim 1, characterized in that: The second centering positioning structure includes: A second positioning groove (312) formed on the wall of the mounting space (311) of the upper cover (310); and The second positioning block (321) is formed on both sides of the static iron core assembly (320) and forms a positioning fit with the second positioning groove (312).

6. The modular contactor according to claim 5, characterized in that: The upper cover (310) is provided with a detachable cover plate (330) for closing the installation space (311); the periphery of the cover plate (330) extends to form a pressure plate (331). When the cover plate (330) is installed in place, the pressure plate (331) and the second positioning groove (312) together clamp and fix the second positioning block (321).

7. The modular contactor according to claim 1, characterized in that: The contact support (220) includes a moving iron core fixing part (224) located above the base (210) and a plurality of moving contact support columns (225) extending downward from the moving iron core fixing part (224) and passing through the central through hole (213); the moving contact assembly (240) is fixedly installed at the lower end of all the moving contact support columns (225); the lower surface of the moving iron core fixing part (224) and the upper surface of the moving contact assembly (240) define the movement distance of the contact support (220) on the base (210).

8. The modular contactor according to claim 7, characterized in that: The moving contact support column (225) is provided with a mounting hole (2254) along its height direction. The moving contact support column (225) is also provided with a limiting hole (2253), and the limiting hole (2253) is provided along the length direction of the contact support (220) and passes through the mounting hole (2254). The moving contact assembly (240) includes: The fastener (241) has a plate-like structure, with both ends bent upwards and abutting at the top to enclose and form a clamping space; The movable contact bridge unit, which is disposed in the clamping space, includes a movable contact bridge (244) and a support plate (245). The movable contact bridge (244) is bent downward on both sides to form side walls (2441), and the support plate (245) is located between the two side walls (2441). An elastic element (242) is disposed on the upper side of the clamping space; The positioning element (243) has its two ends overlapping the limiting hole (2253). When the fixing member (241) is inserted into the mounting hole (2254), the elastic member (242) is restricted by the positioning member (243) at the upper end of the clamping space, and the moving contact bridge unit is pressed against the bottom of the contact support column (225) by the fixing member (241).

9. The modular contactor according to claim 1, characterized in that: The stationary contact assembly (230) includes: The stationary contact (231) includes a terminal block (2311) and a stationary contact plate (2312) arranged parallel to each other. One end of the terminal block (2311) and the stationary contact plate (2312) are connected by a first bend. The arc-starting plate (232) includes a mounting part (2321) and an extension part (2322) arranged parallel to each other. One end of the mounting part (2321) and the extension part (2322) are connected by a second bending part (2324). The other end of the extension part (2322) is bent downward to form an arc-starting part (2323) extending to the outlet position of the arc-extinguishing chamber assembly (120). The mounting part (2321) is fixed to the lower surface of the terminal block (2311), the extension part (2322) is provided with an opening groove (2324), the other end of the stationary contact plate (2312) is accommodated in the opening groove (2324), and the lower surface of the stationary contact plate (2312) is flush with the lower surface of the extension part (2322).

10. The modular contactor according to claim 9, characterized in that: A limiting part (2325) is formed on the second bending part (2324). The limiting part (2325) is located above the opening groove (2324), and its lower surface abuts against the upper surface of the stationary contact plate (2312) contained in the opening groove (2324).

Images