Contactor and coil protection accessory

Abstract

The invention relates to the technical field of electrical connection devices, in particular to a contactor and a coil protection accessory. The contactor provided by the invention comprises an electromagnetic system and a coil protection assembly, the electromagnetic system comprises a movable iron core, a static iron core and a coil, and the movable iron core and the static iron core are oppositely arranged. The coil is arranged on the static iron core. The coil protection assembly comprises a first normally-closed contact, a second normally-closed contact and a delay operation structure. Through mutual cooperation of the first normally-closed contact, the second normally-closed contact, the time-delay operation structure, the movable iron core and the coil, power supply of the coil can be cut off in time under the condition of abnormal attraction of the movable iron core, so that the phenomenon of overheating of the coil and the static iron core can be avoided, the coil can be protected from being damaged by the overheating phenomenon, and the service life of the coil is prolonged. The adopted coil protection assembly is relatively simple in structure and relatively low in cost, the contactor and the coil which are relatively high in amount can be protected at relatively low cost, and the fire risk can be reduced.

Description

Technical Field

[0001] The present application relates to the technical field of electrical connection devices, and in particular to a contactor and a coil protection accessory. Background Art

[0002] A contactor is an automatic control device used to frequently connect and disconnect circuits. It is widely used in power systems, industrial automation and household appliances.

[0003] The basic structure of the contactor includes a coil, a moving iron core and a stationary iron core. Under normal circumstances, when the coil is energized, the moving iron core and the stationary iron core are attracted to each other. However, in actual use, the coil voltage may be too low or the moving iron core may be stuck by foreign objects, so the moving iron core and the stationary iron core cannot be attracted to each other normally. In this case, the coil will heat up seriously, causing the heat-resistant paint of the coil to fail and break down, the coil frame to burn out, and there is a fire hazard. Summary of the invention

[0004] The present application provides a contactor and a coil protection accessory, which can protect the coil in the contactor and avoid coil damage.

[0005] The technical solutions for this application are as follows:

[0006] In a first aspect, the present application provides a contactor, the contactor provided by the present application includes an electromagnetic system and a coil protection component, the electromagnetic system includes a moving iron core, a stationary iron core and a coil, the moving iron core and the stationary iron core are arranged opposite to each other, and the coil is arranged on the stationary iron core.

[0007] The coil protection component includes a first normally closed contact, a second normally closed contact and a delayed operation structure.

[0008] The first normally closed contact includes a first static contact, a first moving contact and a contact support. The first static contact is in contact with the first moving contact, the contact support is linked with the moving iron core, and the first moving contact is linked with the contact support. The time-delay operation structure includes an electrical part and a mechanical part.

[0009] The first normally closed contact is connected in series with the electrical part; and the entire structure after the first normally closed contact and the electrical part are connected in series is connected in parallel with the coil.

[0010] The integral structure formed by the first normally closed contact, the electrical part and the coil is connected in series with the second normally closed contact.

[0011] The electrical part can convert electrical energy into the deformation capacity of the mechanical part when it is powered on. When the moving iron core is abnormally attracted, the mechanical part can disconnect the second normally closed contact by its own deformation. And the mechanical part can restore its deformation after the electrical part is powered off.

[0012] Based on the contactor provided in the first aspect, the contactor provided in the present application includes an electromagnetic system and a coil protection component, and the coil protection component includes a first normally closed contact, a second normally closed contact and a delayed operation structure. Through the cooperation of the first normally closed contact, the second normally closed contact and the delayed operation structure, the moving iron core and the coil, the power supply to the coil can be cut off in time when the moving iron core is abnormally attracted, thereby avoiding the phenomenon of overheating of the coil and the static iron core, and further protecting the coil from damage due to overheating. In addition, the structure of the coil protection component used is relatively simple and the cost is low, so that products and coils with higher amounts can be protected at a lower cost, and the risk of fire can be reduced.

[0013] In one possible design, the electrical part includes a resistance wire and the mechanical part includes a bimetallic strip.

[0014] The bimetallic strip can be heated by the resistance wire, and when the heating time is longer than the predetermined pull-in time, the deformation of the bimetallic strip can trigger the second normally closed contact to open.

[0015] Based on the contactor provided in this embodiment, the coil protection component includes a first normally closed contact, a second normally closed contact and a delayed operation structure, and the delayed operation structure is implemented by a combination of a bimetallic strip and a resistance wire. The coil protection component has the advantages of simple structure, easy implementation and low cost.

[0016] In a possible design, the coil protection assembly further includes a housing, the first normally closed contact is located outside the housing, and the second normally closed contact and the delayed operation structure are located inside the housing.

[0017] Based on the contactor provided in this embodiment, by integrating the second normally closed contact and the delayed operation structure, for the contactor, in some cases, it is only necessary to add an accessory formed by the second normally closed contact and the delayed operation structure to achieve protection of the coil in the contactor, which has the advantage of cost saving.

[0018] In a possible design, the time-delay operation structure further includes a lever. The second normally closed contact includes a second static contact and a second moving contact in contact with each other. The housing includes a bottom.

[0019] The bimetallic strip and the second normally closed contact are arranged side by side in the housing along a first direction, and the first direction is parallel to the plane where the bottom is located.

[0020] The lever is arranged between the bimetallic strip and the second moving contact, one end of the lever is located between the bimetallic strip and the bottom, the other end of the lever is located between the second moving contact and the bottom, and the bottom is also provided with a fulcrum for supporting the lever.

[0021] Based on the contactor provided by this embodiment, the bimetallic strip and the second normally closed contact are arranged side by side along the first direction in the shell, and the bimetallic strip drives the second moving contact through a lever. This layout structure helps to reduce the size of the shell in the first direction. In some cases, it facilitates the installation of the overall structure formed by the second normally closed contact and the delayed operation structure.

[0022] In a possible design, a first support portion and a second support portion for installing a second moving contact member are further provided in the shell, the first support portion and the second support portion are stationary members, the first support portion and the second support portion are arranged along a second direction, and there is a spacing between the first support portion and the second support portion, and the second direction is perpendicular to the first direction and parallel to the plane where the bottom is located.

[0023] Along the second direction, the second moving contact member includes a supporting member, a tension spring and a moving contact piece. Along the first direction, the moving contact piece includes a first abutting portion, a second abutting portion and a connecting portion, and the connecting portion is located between the first abutting portion and the second abutting portion.

[0024] Along the second direction, one end of the support member is rotatably connected to the first support portion, the other end of the support member is hooked with the connecting portion of the movable contact piece through a tension spring, and the first abutting portion and the second abutting portion are respectively abutted with the second support portion.

[0025] Based on the contactor provided in this embodiment, the second moving contact includes a support, a tension spring and a moving contact piece. The tension spring is arranged between the support and the moving contact piece, and the tension spring can play a role in transmitting force, so that the moving contact piece can contact or separate from the second static contact piece. Secondly, in the present application, another important function of setting the tension spring is that when the second normally closed contact is in a closed state, the tension spring can enable the moving contact piece to be in close contact with the second static contact piece. When the second normally closed contact is in an open state, the tension spring can maintain the moving contact piece and the second static contact piece in a stable separation state. In this way, it helps to improve the reliability of the coil protection component, can better protect the coil from damage, and can improve the reliability of the contactor.

[0026] In a possible design, the shell further includes a shell cover and a reset knob, the shell cover is arranged opposite to the bottom, and the second normally closed contact is located between the bottom and the shell cover.

[0027] The reset knob is installed through the shell cover and can rotate relative to the shell cover. The reset knob includes a first reset surface and a second reset surface located in the shell. Along the direction from the shell cover to the bottom, the first reset surface is closer to the moving contact piece than the second reset surface.

[0028] The reset knob includes an automatic reset state and a manual reset state. In the automatic reset state, the first reset surface is opposite to the moving contact of the moving contact piece, and the second reset surface deviates from the moving contact. In the manual reset state, the second reset surface is opposite to the moving contact, and the first reset surface deviates from the moving contact.

[0029] Based on the contactor provided by this embodiment, the reset knob includes a first reset surface and a second reset surface with a height difference. The first reset surface, the second reset surface and the structural combination of the second moving contact with a tension spring can realize manual closing and automatic closing of the second normally closed contact after disconnection. In this way, in practical applications, the working mode of the reset knob can be selected according to the use environment and working conditions of the contactor. For example, in the wild without supervision, the automatic mode can be selected, so that the normal operation of the contactor can be minimized while protecting the coil.

[0030] In a possible design, the delay operation structure further includes a first wire, a second wire, and a third wire.

[0031] The first wire is electrically connected to the bimetallic strip and extends out of the housing for connecting the first normally closed contact in series.

[0032] The resistance wire comprises a first end and a second end. The first end of the resistance wire is electrically connected to the bimetallic strip, the second end of the resistance wire is electrically connected to a second wire, and the second wire extends out of the housing for parallel connection with the coil.

[0033] The second end of the resistance wire is also connected in series with the second normally closed contact through a third wire.

[0034] Based on the contactor provided in this embodiment, the delayed operation structure can realize electrical connection with the coil, the first normally closed contact and the second normally closed contact through the first wire, the second wire and the third wire, and because the first wire and the second wire both extend out of the shell, this also facilitates the wiring between the overall structure formed by the second normally closed contact and the delayed operation structure and the contactor.

[0035] In a possible design, the time-delay operation structure further includes an electrical connection board.

[0036] Along the second direction, the bimetallic strip includes a first connection end and a second connection end, one end of the electrical connection plate is electrically connected to the first wire, and the other end of the electrical connection plate is fixed and electrically connected to the first connection end. The second connection end is in contact with the lever.

[0037] Based on the contactor provided by this embodiment, the electrical connection plate has the function of conducting current, and the electrical connection plate has the function of supporting and fixing the position of the bimetallic strip. When the bimetallic strip is heated, the first connection end is fixed and the second connection end can bend toward the lever relative to the first connection end, thereby realizing the driving of the bimetallic strip to the second normally closed contact.

[0038] In a possible design, the connection position between the first end of the resistance wire and the bimetallic strip is close to the second connection end, and the second end of the resistance wire is close to the first connection end.

[0039] In a second aspect, based on the same invention structure, the present application also provides a coil protection accessory, comprising any of the above-mentioned second normally closed contacts and delayed operation structures.

[0040] The second aspect includes the second normally closed contact and delayed operation structure of the first aspect. The beneficial effects of the second aspect can be referred to the beneficial effects brought about by the above-mentioned first aspect and various possible implementation methods of the first aspect, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 This is a diagram of the initial state of the contactor provided in an embodiment of the present application when the moving iron core is normally attracted.

[0042] Figure 2 This is a diagram of the final state of the contactor provided in an embodiment of the present application when the moving iron core is normally attracted.

[0043] Figure 3 This is a diagram of the initial state of the contactor provided in an embodiment of the present application when the coil is under-voltage and the moving iron core cannot be normally attracted.

[0044] Figure 4 This is a diagram of the final state of the contactor provided in an embodiment of the present application when the coil is under-voltage and the moving iron core cannot be normally attracted.

[0045] Figure 5 A schematic diagram of the structure of a coil protection accessory provided in an embodiment of the present application.

[0046] Figure 6 Shown is a schematic diagram of the assembly structure of the coil protection accessory and the contactor body provided in an embodiment of the present application.

[0047] Figure 7 for Figure 5 Schematic diagram of the structure from another perspective.

[0048] Figure 8 for Figure 5 Schematic diagram of the explosion structure.

[0049] Fig. 9 A schematic diagram of the closed state of the coil protection accessory provided in an embodiment of the present application in the manual reset mode.

[0050] Fig.10 A schematic diagram of the disconnected state of the coil protection accessory provided in an embodiment of the present application in the manual reset mode.

[0051] Fig.11 A schematic diagram of the closed state of the coil protection accessory provided in an embodiment of the present application in the automatic reset mode.

[0052] Fig.12A schematic diagram of the disconnected state of the coil protection accessory provided in an embodiment of the present application in the automatic reset mode.

[0053] The accompanying drawings are denoted as follows:

[0054] 1. Electromagnetic system; 11. Moving iron core; 12. Static iron core; 13. Coil; 131. Second external conductor; 132. Third external conductor;

[0055] 2. Coil protection components;

[0056] 21. first normally closed contact; 211. contact support; 212. first stationary contact; 213. first moving contact;

[0057] 22, second normally closed contact; 221, second stationary contact; 2211, first external wire; 2212, connection screw; 222, second moving contact; 2221, support member; 2222, tension spring; 2223, moving contact piece; 22231, first abutting portion; 22232, second abutting portion; 22233, connecting portion;

[0058] 23. Delay operation structure; 231. Resistance wire; 2311. First end; 2312. Second end; 232. Bimetallic strip; 233. Lever; 234. First wire; 235. Second wire; 236. Third wire; 237. Electrical connection board; 238. First connecting wire; 239. Second connecting wire;

[0059] 24. Shell; 241. Bottom; 242. First support portion; 243. Second support portion; 244. Shell cover;

[0060] 25. Reset knob; 251. First reset surface; 252. Second reset surface; A. Contactor body; B. Coil protection accessories. DETAILED DESCRIPTION

[0061] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0062] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of the application are only for the purpose of describing specific embodiments and are not intended to limit this application. The terms "including" and "having" and any variations thereof in the specification and claims and the accompanying drawings of this application are intended to cover non-exclusive inclusions.

[0063] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase "embodiments" in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0064] In addition, the terms "first", "second", etc. in the specification and claims of this application or the above-mentioned 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.

[0065] In the description of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, the "connection" or "connection" of a mechanical structure may refer to a physical connection. For example, the physical connection may be a fixed connection, such as a fixed connection through a barrier member, such as a fixed connection through screws, bolts or other barrier members. The physical connection may also be a detachable connection, such as a mutual snap-on or snap-fit ​​connection. The physical connection may also be an integral connection, such as a connection formed by welding, bonding or integral molding. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0066] The present application is described in detail below with reference to the accompanying drawings.

[0067] Figure 1 1 is an initial state diagram of the contactor provided in the embodiment of the present application when the moving iron core is normally attracted, 2 is a final state diagram of the contactor provided in the embodiment of the present application when the moving iron core is normally attracted, Figure 3 This is a diagram of the initial state of the contactor provided in the embodiment of the present application when the coil is under-voltage and the moving iron core cannot be normally attracted. Figure 4 This is a diagram of the final state of the contactor provided in an embodiment of the present application when the coil is under-voltage and the moving iron core cannot be normally attracted.

[0068] Please refer to Figures 1 to 4The contactor provided in the present application includes an electromagnetic system 1 and a coil protection assembly 2. The electromagnetic system 1 includes a moving iron core 11, a stationary iron core 12 and a coil 13. The moving iron core 11 and the stationary iron core 12 are arranged opposite to each other. The coil 13 is arranged on the stationary iron core 12.

[0069] The coil protection assembly 2 includes a first normally closed contact 21 , a second normally closed contact 22 and a delayed operation structure 23 .

[0070] The first normally closed contact 21 includes a first stationary contact 212, a first moving contact 213 and a contact support 211. The first stationary contact 212 is in contact with the first moving contact 213, the contact support 211 is linked with the moving iron core 11, and the first moving contact 213 is linked with the contact support 211. The time-delay operation structure 23 includes an electrical part and a mechanical part.

[0071] The first normally closed contact 21 is connected in series with the electrical part; the entire structure after the first normally closed contact 21 and the electrical part are connected in series is connected in parallel with the coil 13.

[0072] The integral structure formed by the first normally closed contact 21 , the electrical part and the coil 13 is connected in series with the second normally closed contact 22 .

[0073] The electrical part can convert electrical energy into the deformation capacity of the mechanical part when powered on. When the moving iron core 11 is abnormally attracted, the mechanical part can disconnect the second normally closed contact 22 by its own deformation. And the mechanical part can restore its deformation after the electrical part is powered off.

[0074] Specifically, the working principle of the electromagnetic system 1 is: the coil 13 generates a magnetic field after being energized, and the static iron core 12 is magnetized under the action of the magnetic field, thereby generating an attractive force. The moving iron core 11 is attracted by the attractive force generated by the static iron core 12, and is attracted to the static iron core 12. It should be noted that, under normal circumstances, due to the influence of factors such as the magnetic field establishment time, the hysteresis effect, and mechanical inertia, when the coil 13 is normally energized, the moving iron core 11 will not be immediately attracted to the static iron core 12, but will be attracted to the static iron core 12 after a period of time. In this application, under normal circumstances, after the coil 13 is energized, the predetermined attraction time of the moving iron core 11 and the static iron core 12 is recorded as T1.

[0075] It is understandable that in the present application, the first normally closed contact 21 is connected in parallel with the coil 13. In this way, as long as the coil 13 is energized and the moving iron core 11 is not attracted to the stationary iron core 12, the first normally closed contact 21 is always in the energized state. When the moving iron core 11 moves toward the stationary iron core 12, the first moving contact 213 separates from the first stationary contact 212, and the first normally closed contact 21 is de-energized. In this way, the energization time of the first normally closed contact 21 can reflect the state of the moving iron core 11. When the energization time of the first normally closed contact 21 exceeds the predetermined attraction time T1, it indicates that the moving iron core 11 is abnormally attracted.

[0076] Then, in the present application, the abnormal attraction of the moving iron core 11 refers to the situation that when the coil 13 is energized, the moving iron core 11 fails to be attracted with the stationary iron core 12 for more than a predetermined attraction time.

[0077] It can also be understood that, in the present application, the delayed operation structure 23 includes an electrical part and a mechanical part. The electrical part is connected in series with the first normally closed contact 21 to convert electrical energy into the deformation capacity of the mechanical part. When the predetermined pull-in time T1 is exceeded, the mechanical part disconnects the second normally closed contact 22, thereby achieving protection for the coil 13.

[0078] Please combine Figure 1 and Figure 2 , Figure 1 and Figure 2 This reflects the normal attraction process of the moving iron core 11 and the stationary iron core 12 in the contactor. Figure 1 , the normal working voltage of coil 13 is U1. When coil 13 is initially energized, the energization time is less than T1, and the moving iron core 11 and the static iron core 12 have not yet been attracted. Please refer to Figure 2 After the coil 13 is energized for a period of time T1, the moving iron core 11 and the stationary iron core 12 are attracted to each other.

[0079] from Figure 1 and Figure 2 It can be seen that under normal attraction, due to the movement of the moving iron core 11, the first normally closed contact 21 is disconnected, and the delay operation structure 23 is also powered off. In this way, the delay operation structure 23 will not disconnect the second normally closed contact 22, the second normally closed contact 22 always remains in a closed state, and the coil 13 will not be powered off.

[0080] Figure 3 and Figure 4 This reflects the abnormal process of the moving iron core 11 and the static iron core 12 in the contactor being attracted. Please refer to Figure 3 , the voltage across the coil 13 is U2, which is less than the normal working voltage U1 of the coil 13. Figure 1 The situation shown is similar. In the initial state where the coil 13 is energized, the moving iron core 11 and the stationary iron core 12 are not yet attracted.

[0081] Please refer to Figure 4After the coil 13 is energized for a period of time T1, the moving iron core 11 is still not attracted to the static iron core 12. Then, the first normally closed contact 21 is always in a closed state, and the electrical part of the delay operation structure 23 is also always in a energized state. The electrical part continuously converts electrical energy into the deformation capacity of the mechanical part. After time T1, the mechanical part disconnects the second normally closed contact 22 through its own deformation. In this way, the power supply to the coil 13 and the electrical part of the delay operation structure 23 is cut off, avoiding the overheating of the coil 13 and the static iron core 12. After the electrical part of the delay operation structure 23 is powered off, the mechanical part gradually recovers its deformation.

[0082] It should be noted that the delay operation structure 23 of the present application can be implemented in many ways, not limited to Figures 1 to 4 The bimetal strip 232 shown in . Any structure that can convert electrical energy into deformation capacity and has a delayed action is acceptable. For example, the delayed operation structure 23 can also be an airbag component controlled by an electromagnetic structure. In the airbag component controlled by the electromagnetic structure, the electrical part is the electromagnetic structure, and the mechanical part is the airbag. The contraction and expansion of the airbag are controlled by the electromagnetic structure, so that the airbag can control the second normally closed contact 22. The time required for the airbag to expand from a contracted state to a state in which the second normally closed contact 22 can be disconnected can be designed as T1, so that the function of disconnecting the second normally closed contact 22 can be realized when the moving iron core 11 is abnormally attracted.

[0083] In summary, the contactor provided in the present application includes an electromagnetic system 1 and a coil protection component 2, and the coil protection component 2 includes a first normally closed contact 21, a second normally closed contact 22 and a delayed operation structure 23. Through the mutual cooperation of the first normally closed contact 21, the second normally closed contact 22 and the delayed operation structure 23, the moving iron core 11 and the coil 13, when the moving iron core 11 is abnormally attracted, the power supply to the coil 13 can be cut off in time, thereby avoiding overheating of the coil 13 and the static iron core 12, and further protecting the coil 13 from damage due to overheating.

[0084] In addition, the contactor provided in the present application uses a coil protection component 2 with a relatively simple structure and low cost, thereby achieving protection of products and coils 13 with higher value at a lower cost and reducing the risk of fire.

[0085] It should be noted that, in the present application, the abnormal energization of the moving iron core 11 includes the case where the moving iron core 11 cannot be energized due to insufficient working voltage of the coil 13, and also includes the case where the moving iron core 11 cannot be energized due to a foreign object. When the moving iron core 11 cannot be energized due to a foreign object, the protection principle of the coil protection component 2 for the coil 13 is the same as that of the coil protection component 2. Figure 3 to Figure 4 The protection principle for insufficient working voltage of the coil 13 shown is the same and will not be described again here.

[0086] Please continue to refer to Figure 1 , Figure 2 , Figure 3 or Figure 4 In some embodiments of the present application, the electrical part includes a resistance wire 231, and the mechanical part includes a bimetallic strip 232. The bimetallic strip 232 can be heated by the resistance wire 231, and when the heating time is longer than the predetermined pull-in time, the deformation of the bimetallic strip 232 can trigger the second normally closed contact 22 to open.

[0087] Specifically, in this embodiment, the time-delay operation structure 23 includes a bimetallic strip 232 and a resistance wire 231. When the coil 13 is energized, the resistance wire 231 generates heat to heat the bimetallic strip 232. As the temperature rises, the bimetallic strip 232 undergoes a certain deformation. When the heating time reaches T1, the deformation of the bimetallic strip 232 can trigger the first normally closed contact 21 to open.

[0088] Based on the contactor provided in this embodiment, the coil protection component 2 includes a first normally closed contact 21, a second normally closed contact 22 and a delayed operation structure 23, and the delayed operation structure 23 is implemented by a combination of a bimetallic strip 232 and a resistance wire 231. The coil protection component 2 has the advantages of simple structure, easy implementation and low cost.

[0089] Figure 5 A schematic diagram of the structure of a coil protection accessory provided in an embodiment of the present application. Figure 6 Shown is a schematic diagram of the assembly structure of the coil protection accessory and the contactor provided in an embodiment of the present application.

[0090] Please refer to Figure 4 , Figure 5 and Figure 6 In some embodiments of the present application, the coil protection assembly 2 further includes a housing 24 , the first normally closed contact 21 is located outside the housing 24 , and the second normally closed contact 22 and the delayed operation structure 23 are located inside the housing 24 .

[0091] Specifically, some contactor bodies A have a first normally closed contact 21, and the coil protection assembly 2 can work with the help of the first normally closed contact 21 of the contactor body A. In some contactors, the contactor body A does not have the first normally closed contact 21, but some normally closed contact accessories can be installed in the electromagnetic system 1 in the contactor body A for use.

[0092] Based on the structural characteristics of the above-mentioned contactor, in some embodiments of the present application, only the second normally closed contact 22 and the delayed operation structure 23 are integrated. In this way, for the contactor, only the coil protection accessory B formed by the second normally closed contact 22 and the delayed operation structure 23 needs to be added to protect the coil 13 in the contactor, which has the advantage of cost saving.

[0093] Figure 7 for Figure 5 A schematic diagram of the structure from another perspective. Figure 8 for Figure 5 Schematic diagram of the explosion structure.

[0094] Please refer to Figure 5 , Figure 7 and Figure 8 In some embodiments of the present application, the time-delay operation structure 23 further includes a lever 233. The second normally closed contact 22 includes a second static contact 221 and a second moving contact 222 in contact with each other. The housing 24 includes a bottom 241.

[0095] The bimetallic strip 232 and the second normally closed contact 22 are arranged side by side in the housing 24 along a first direction, and the first direction is parallel to the plane where the bottom 241 is located.

[0096] The lever 233 is disposed between the bimetallic strip 232 and the second movable contact 222 , one end of the lever 233 is located between the bimetallic strip 232 and the bottom 241 , the other end of the lever 233 is located between the second movable contact 222 and the bottom 241 , and the bottom 241 is further provided with a fulcrum for supporting the lever 233 .

[0097] Based on the contactor provided in this embodiment, when the moving iron core 11 is abnormally attracted, the bimetallic strip 232 is deformed and presses one end of the lever 233, and the other end of the lever 233 drives the second moving contact 222 to separate the second moving contact 222 from the second static contact 221. The bimetallic strip 232 and the second normally closed contact 22 are arranged side by side in the first direction in the housing 24, and the bimetallic strip 232 drives the second moving contact 222 through the lever 233. This layout structure helps to reduce the size of the housing 24 in the first direction, and in some cases, facilitates the installation of the coil protection accessory B formed by the second normally closed contact 22 and the delayed operation structure 23.

[0098] Please continue to refer to Figure 5 , Figure 7 and Figure 8In some embodiments of the present application, a first support portion 242 and a second support portion 243 for mounting the second moving contact member 222 are further provided in the shell 24. The first support portion 242 and the second support portion 243 are fixed members. The first support portion 242 and the second support portion 243 are arranged along the second direction, and there is a spacing between the first support portion 242 and the second support portion 243. The second direction is perpendicular to the first direction and parallel to the plane where the bottom 241 is located.

[0099] Along the second direction, the second movable contact member 222 includes a support member 2221, a tension spring 2222 and a movable contact piece 2223. Along the first direction, the movable contact piece 2223 includes a first abutting portion 22231, a second abutting portion 22232 and a connecting portion 22233, and the connecting portion 22233 is located between the first abutting portion 22231 and the second abutting portion 22232.

[0100] Along the second direction, one end of the support member 2221 is rotatably connected to the first support portion 242, and the other end of the support member 2221 is hooked with the connecting portion 22233 of the movable contact piece 2223 through the tension spring 2222, and the first abutting portion 22231 and the second abutting portion 22232 abut against the second support portion 243 respectively.

[0101] Fig. 9 This is a schematic diagram of the closed state of the coil protection accessory provided in the embodiment of the present application in the manual reset mode. Fig.10 A schematic diagram of the disconnected state of the coil protection accessory provided in an embodiment of the present application in the manual reset mode.

[0102] Please combine Figure 5 , Figure 7 , Fig. 9 and Fig.10 In this embodiment, the second moving contact member 222 includes a supporting member 2221, a tension spring 2222 and a moving contact piece 2223, wherein the supporting member 2221 is rotatably connected to the first supporting portion 242, and the tension spring 2222 is located between the supporting member 2221 and the moving contact piece 2223. In this way, when the moving iron core 11 is abnormally attracted, the lever 233 will lift the supporting member 2221, and the supporting member 2221 will rotate relative to the first supporting portion 242. The supporting member 2221 drives the moving contact piece 2223 through the tension spring 2222, so that the moving contact piece 2223 rotates relative to the second supporting portion 243, thereby realizing the separation of the moving contact piece 2223 and the second static contact member 221.

[0103] It can be understood that, in this embodiment, the tension spring 2222 is disposed between the support member 2221 and the movable contact piece 2223, and the tension spring 2222 can play a role in transmitting force, so that the movable contact piece 2223 can contact or separate from the second stationary contact member 221. Secondly, another important function of the tension spring 2222 is that when the second normally closed contact 22 is in the closed state, the tension spring 2222 can make the movable contact piece 2223 and the second stationary contact member 221 in close contact. When the second normally closed contact 22 is in the open state, the tension spring 2222 can keep the movable contact piece 2223 and the second stationary contact member 221 in a stable separation state.

[0104] For more information, see Fig. 9 and Fig.10 There are the following three positional relationships between the tension spring 2222 and the movable contact piece 2223:

[0105] First, the axis C2 of the tension spring 2222 coincides with the geometric center axis C1 of the movable contact piece 2223 , which is a critical state.

[0106] Second: the axis C2 of the tension spring 2222 is relatively located below the geometric center axis C1 of the moving contact piece 2223. At this time, the tension spring 2222 has a downward pulling force on the moving contact piece 2223, so that the moving contact piece 2223 can be in close contact with the second static contact 221, which helps to maintain the closed state of the second normally closed contact 22.

[0107] Third, the axis C2 of the tension spring 2222 is located above the geometric center axis C1 of the movable contact piece 2223 . At this time, the tension spring 2222 exerts an upward pulling force on the movable contact piece 2223 , which helps to maintain the disconnected state of the second normally closed contact 22 .

[0108] It can be understood that in the present application, the second supporting portion 243 provided in the housing 24 and the first abutting portion 22231 and the second abutting portion 22232 provided on the movable contact piece 2223 help the tension spring 2222 to achieve the above-mentioned function.

[0109] Fig.11 This is a schematic diagram of the closed state of the coil protection accessory provided in the embodiment of the present application in the automatic reset mode. Fig.12 A schematic diagram of the disconnected state of the coil protection accessory provided in an embodiment of the present application in the automatic reset mode.

[0110] Please refer to Figures 9 to 12 In some embodiments of the present application, the shell 24 further includes a shell cover 244 and a reset knob 25 . The shell cover 244 is arranged opposite to the bottom 241 , and the second normally closed contact 22 is located between the bottom 241 and the shell cover 244 .

[0111] The reset knob 25 is fixed on the shell cover 244, and the action surface of the reset knob 25 is located in the shell 24, and the action surface includes a first reset surface 251 and a second reset surface 252. Along the direction from the shell cover 244 to the bottom 241, the first reset surface 251 is closer to the movable contact piece 2223 than the second reset surface 252.

[0112] The reset knob 25 includes an automatic reset state and a manual reset state. In the automatic reset state, the first reset surface 251 is opposite to the moving contact point on the moving contact piece 2223, and the second reset surface 252 is offset from the moving contact point. In the manual reset state, the second reset surface 252 is opposite to the moving contact point of the moving contact piece 2223, and the first reset surface 251 is offset from the moving contact point of the moving contact piece 2223.

[0113] Please refer to Figures 9 to 12 Based on the contactor provided in this embodiment, the second normally closed contact 22 can have a manual reset mode and an automatic reset mode.

[0114] Please refer to Fig. 9 In the manual mode, when the second normally closed contact 22 is in the closed state, the second reset surface 252 of the reset knob 25 is opposite to the moving contact. Fig.10 In manual mode, when the second normally closed contact 22 is disconnected due to abnormal attraction of the moving iron core 11, the second reset surface 252 of the reset knob 25 is still opposite to the moving contact. If the second normally closed contact 22 is to be switched from the disconnected state to the closed state, the reset knob 25 must be rotated to rotate the first reset surface 251 to the position of the moving contact so that the first reset surface 251 applies a reset force to the moving contact. In this way, the second normally closed contact 22 can be closed.

[0115] Please refer to Fig.11 In the automatic mode, when the second normally closed contact 22 is in the closed state, the first reset surface 251 of the reset knob 25 is opposite to the moving contact. Fig.12 In the automatic mode, when the second normally closed contact 22 is abnormally attracted due to the moving iron core 11, and the moving contact piece 2223 is disconnected from the second static contact 221, the moving contact piece 2223 rotates toward the first reset surface 251. When it touches the first reset surface 251, it will be subjected to the reverse force of the first reset surface 251, so that the moving contact on the moving contact piece 2223 contacts the static contact on the second static contact 221 again, and the second normally closed contact 22 is closed.

[0116] As can be seen from the above, the reset knob 25 in the contactor of the present application includes a first reset surface 251 and a second reset surface 252 with a height difference. By utilizing the structural combination of the first reset surface 251, the second reset surface 252 and the above-mentioned second moving contact 222 with a tension spring 2222, the second normally closed contact 22 can be manually closed and automatically closed after being disconnected.

[0117] In the actual application process, it is found that the abnormal attraction of the moving iron core 11 is sometimes due to undervoltage and sometimes due to foreign matter jamming. Undervoltage sometimes occurs during peak power consumption. When the peak power consumption is over, the voltage will return to normal. Foreign matter jamming can sometimes be eliminated by the attraction and disconnection of the moving iron core 11. Therefore, in actual application, the working mode of the reset knob 25 can be selected according to the use environment of the contactor and the working condition of the contactor. For example, in the case of unattended outdoor, the automatic mode can be selected, so that the normal operation of the contactor can be minimized while protecting the coil 13.

[0118] Please combine Figure 4 , Figure 5 , Figure 6 and Figure 8 In some embodiments of the present application, the delay operation structure 23 also includes a first wire 234 , a second wire 235 and a third wire 236 .

[0119] The first wire 234 is electrically connected to the bimetallic strip 232 , and the first wire 234 extends out of the housing 24 for being connected in series with the first normally closed contact 21 .

[0120] The resistance wire 231 includes a first end 2311 and a second end 2312 . The first end 2311 of the resistance wire 231 is electrically connected to the bimetallic strip 232 . The second end 2312 of the resistance wire 231 is electrically connected to a second wire 235 . The second wire 235 extends out of the housing 24 for parallel connection with the coil 13 .

[0121] The second end 2312 of the resistance wire 231 is also connected in series with the second normally closed contact 22 via a third wire 236 .

[0122] For more information, see Figure 6 Based on the contactor provided in this embodiment, the delay operation structure 23 can realize electrical connection with the coil 13, the first normally closed contact 21 and the second normally closed contact 22 through the first wire 234, the second wire 235 and the third wire 236, and the first wire 234 and the second wire 235 are both extended out of the shell 24. In this way, when the coil protection accessory B composed of the second normally closed contact 22 and the delay operation structure 23 is connected to the contactor body A, the first wire 234 and the second wire 235 can be used to connect to the contactor body A by extending the part of the shell 24; if the first wire 234 and the second wire 235 are both extended out of the shell 24, then a first connecting wire 238 can be set at the first wire 234, and the bimetallic strip 232 and the first normally closed contact 21 separated by a certain distance are connected in series through the first connecting wire 238. Similarly, a second connecting wire 239 is set at the second wire 235, and the resistance wire 231 and the coil 13 separated by a certain distance are connected in parallel through the second connecting wire 239.

[0123] It can be seen from the above that based on the contactor provided in this embodiment, the delayed operation structure 23 can realize electrical connection with the coil 13, the first normally closed contact 21 and the second normally closed contact 22 through the first wire 234, the second wire 235 and the third wire 236, and because the first wire 234 and the second wire 235 both extend out of the shell 24, this facilitates the wiring between the coil protection accessory B constituted by the second normally closed contact 22 and the delayed operation structure 23 and the contactor body A.

[0124] Please continue to refer to Figure 5 , Figure 6 and Figure 8 In some embodiments of the present application, the second static contact 221 is fixed to the bottom 241 of the housing 24, and the second static contact 221 is connected to the first external wire 2211 through the wiring screw 2212, so that current can flow into the second normally closed contact 22 to supply power to one end of the coil 13. The power supply to the other end of the coil 13 can be supplied by the second external wire 131 connected to the coil 13.

[0125] Please combine Figure 5 and Figure 8 In the present application, when the coil protection assembly 2 is connected to the contactor body A, it is not only necessary to electrically connect the coil protection attachment B formed by the time-delay operation structure 23 and the second normally closed contact 22 to the contactor body A, but also necessary to connect the first normally closed contact 21 to the coil 13 in parallel. Specifically, in some embodiments of the present application, a third external wire 132 may be provided, and the first normally closed contact 21 and the coil 13 separated by a certain distance may be connected in parallel through the third external wire 132.

[0126] Please continue to refer to Figure 8 In some embodiments of the present application, the delay operation structure 23 also includes an electrical connection board 237 .

[0127] Along the second direction, the bimetal strip 232 includes a first connection end and a second connection end, one end of the electrical connection plate 237 is electrically connected to the first wire 234 , and the other end of the electrical connection plate 237 is fixed and electrically connected to the first connection end.

[0128] Specifically, in this embodiment, the electrical connection plate 237 has the function of conducting current, and the electrical connection plate 237 has the function of supporting and fixing the position of the bimetallic strip 232. When the bimetallic strip 232 is heated, the first connection end is fixed, and the second connection end can bend toward the lever 233 relative to the first connection end. In this way, the bimetallic strip 232 drives the second normally closed contact 22.

[0129] Please continue to refer to Figure 8In some embodiments of the present application, the connection position between the first end 2311 of the resistance wire 231 and the bimetallic strip 232 is close to the second connection end, and the second end 2312 of the resistance wire 231 is close to the first connection end.

[0130] Based on the same inventive concept, the present application also provides a coil protection accessory B, including any of the above-mentioned second normally closed contacts 22 and delayed operation structure 23. The coil protection accessory B includes the above-mentioned second normally closed contact 22 and delayed operation structure 23, and its beneficial effects can refer to the beneficial effects brought by the above-mentioned second normally closed contact 22 and delayed operation structure 23, which will not be repeated here.

[0131] Those skilled in the art will appreciate that, although some embodiments herein include certain features included in other embodiments but not other features, the combination of features of different embodiments is meant to be within the scope of the present application and form different embodiments. For example, in the claims, any one of the claimed embodiments may be used in any combination.

[0132] As described above, the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application is described in detail with reference to the above embodiments, a person of ordinary skill in the art should understand that the technical solutions described in the above embodiments can still be modified, or some of the technical features can be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A contactor, characterized in that: Including electromagnetic system and coil protection components; The electromagnetic system comprises a moving iron core, a stationary iron core and a coil, wherein the moving iron core is arranged opposite to the stationary iron core; and the coil is arranged on the stationary iron core; The coil protection assembly includes a first normally closed contact, a second normally closed contact and a delayed operation structure; The first normally closed contact comprises a first static contact, a first moving contact and a contact support; wherein the first static contact is in contact with the first moving contact, the contact support is linked with the moving iron core, and the first moving contact is linked with the contact support; the time-delay operation structure comprises an electrical part and a mechanical part; The first normally closed contact is connected in series with the electrical part; the entire structure after the first normally closed contact and the electrical part are connected in series is connected in parallel with the coil; The first normally closed contact, the electrical part and the coil form an integral structure connected in series with the second normally closed contact; The electrical part can convert electrical energy into the deformation capacity of the mechanical part when powered on; the mechanical part can disconnect the second normally closed contact by its own deformation when the moving iron core is abnormally attracted; and the mechanical part can restore its deformation after the electrical part is powered off.

2. The contactor according to claim 1, characterized in that: The electrical part includes a resistance wire, and the mechanical part includes a bimetallic strip; The bimetallic strip can be heated by the resistance wire, and when the heating time is longer than the predetermined pull-in time, the deformation of the bimetallic strip can trigger the second normally closed contact to open.

3. The contactor according to claim 2, characterized in that: The coil protection assembly also includes a shell, the first normally closed contact is located outside the shell, and the second normally closed contact and the delayed operation structure are located inside the shell.

4. The contactor according to claim 3, characterized in that: The time-delay operation structure further includes a lever; the second normally closed contact includes a second static contact and a second moving contact in contact with each other; the housing includes a bottom; The bimetallic strip and the second normally closed contact are arranged side by side in the housing along a first direction, and the first direction is parallel to the plane where the bottom is located; The lever is arranged between the bimetallic strip and the second moving contact, one end of the lever is located between the bimetallic strip and the bottom, the other end of the lever is located between the second moving contact and the bottom, and the bottom is also provided with a fulcrum for supporting the lever.

5. The contactor according to claim 3 or 4, characterized in that: The housing is further provided with a first support portion and a second support portion for mounting the second moving contact member, the first support portion and the second support portion are stationary members, the first support portion and the second support portion are arranged along a second direction, and there is a distance between the first support portion and the second support portion, and the second direction is perpendicular to the first direction and parallel to the plane where the bottom of the housing is located; Along the second direction, the second moving contact member includes a supporting member, a tension spring and a moving contact piece; along the first direction, the moving contact piece includes a first abutting portion, a second abutting portion and a connecting portion, and the connecting portion is located between the first abutting portion and the second abutting portion; Along the second direction, one end of the support member is rotatably connected to the first support portion, the other end of the support member is hooked with the connecting portion of the movable contact piece through the tension spring, and the first abutting portion and the second abutting portion abut against the second support portion respectively.

6. The contactor according to claim 5, characterized in that: The housing further comprises a housing cover and a reset knob, wherein the housing cover is arranged opposite to the bottom, and the second normally closed contact is located between the bottom and the housing cover; The reset knob is installed through the shell cover and can rotate relative to the shell cover. The reset knob includes a first reset surface and a second reset surface located in the shell. Along the direction from the shell cover to the bottom, the first reset surface is closer to the movable contact piece than the second reset surface. The reset knob includes an automatic reset state and a manual reset state. In the automatic reset state, the first reset surface is opposite to the moving contact of the moving contact piece, and the second reset surface deviates from the moving contact; in the manual reset state, the second reset surface is opposite to the moving contact, and the first reset surface deviates from the moving contact.

7. The contactor according to claim 3 or 4, characterized in that: The delay operation structure also includes a first wire, a second wire and a third wire; The first wire is electrically connected to the bimetallic strip, and the first wire extends out of the housing and is used to connect the first normally closed contact in series; The resistance wire comprises a first end and a second end, the first end of the resistance wire is electrically connected to the bimetallic strip, the second end of the resistance wire is electrically connected to the second wire, and the second wire extends out of the housing and is used to be connected in parallel with the coil; The second end of the resistance wire is also connected in series with the second normally closed contact through the third wire.

8. The contactor according to claim 7, characterized in that: The time-delay operation structure also includes an electrical connection plate; Along the second direction, the bimetallic strip includes a first connection end and a second connection end, one end of the electrical connection plate is electrically connected to the first wire, and the other end of the electrical connection plate is fixed and electrically connected to the first connection end; the second connection end is in contact with the lever.

9. The contactor according to claim 8, characterized in that: The connection position between the first end of the resistance wire and the bimetallic strip is close to the second connection end, and the second end of the resistance wire is close to the first connection end.

10. A coil protection accessory, characterized in that: It includes the second normally closed contact and delayed operation structure as described in any one of claims 1 to 9.

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