A contactor and coil protection accessory

Abstract

The application relates to the technical field of electrical connection devices, in particular to a contactor and a coil protection accessory. The contactor provided by the application comprises an electromagnetic system and a coil protection component, the electromagnetic system comprises a moving iron core, a static iron core and a coil, and the moving iron core is arranged opposite to the static iron core. The coil is arranged on the static iron core. The coil protection component comprises a first normally closed contact, a second normally closed contact and a time-delay operation structure. Through the cooperation of the first normally closed contact, the second normally closed contact, the time-delay operation structure, the moving iron core and the coil, the coil power supply can be cut off in time under the condition that the moving iron core is attracted abnormally, so that the overheat phenomenon of the coil and the static iron core can be avoided, the coil can be protected from the damage caused by the overheat phenomenon, the coil protection component structure is relatively simple, the cost is relatively low, a relatively high contactor and coil are protected at a 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, in particular to a contactor and a coil protection accessory. BACKGROUND

[0002] The contactor is an automatic control electrical appliance for frequently turning on and off the circuit, and 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 static iron core. Normally, the coil is powered, and the moving iron core is attracted to the static iron core. However, in actual use, the coil voltage may be too low or the moving iron core may be stuck by foreign matter, and the moving iron core and the static iron core cannot be normally attracted. In this case, the coil will generate serious heat, causing the coil heat-resistant paint to fail and break down, and the coil skeleton to burn out, and there is a fire hazard. SUMMARY

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

[0005] The technical solution of the present application is as follows:

[0006] In a first aspect, the present application provides a contactor, which includes an electromagnetic system and a coil protection assembly. The electromagnetic system includes a moving iron core, a static iron core and a coil. The moving iron core and the static iron core are arranged oppositely. The coil is arranged on the static iron core.

[0007] The coil protection assembly includes a first normally closed contact, a second normally closed contact and a delay 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. The first moving contact is linked with the contact support. The 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. The overall structure of the first normally closed contact connected in series with the electrical part is connected in parallel with the coil.

[0010] The overall structure of 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 ability of the mechanical part under power-on condition. The mechanical part can disconnect the second normally closed contact through its own deformation under abnormal attraction of the moving iron core. The mechanical part can restore the 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 comprises an electromagnetic system and a coil protection assembly, the coil protection assembly comprises a first normally closed contact, a second normally closed contact and a time-delay operating structure, through the cooperation of the first normally closed contact, the second normally closed contact, the time-delay operating structure, the moving iron core and the coil, the coil power supply can be cut off in time in the case of abnormal attraction of the moving iron core, so as to avoid the phenomenon of overheating of the coil and the static iron core, and further to protect the coil from damage caused by overheating. Moreover, the coil protection assembly has a simple structure and low cost, and can protect the product and the coil with a higher cost at a lower cost, and can reduce the risk of fire.

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

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

[0015] Based on the contactor provided in the embodiment, the coil protection assembly comprises a first normally closed contact, a second normally closed contact and a time-delay operating structure, and the time-delay operating structure is realized by the combination of a bimetallic strip and a resistance wire. The coil protection assembly has the advantages of simple structure, easy implementation and low cost.

[0016] In a possible design, the coil protection assembly further comprises a housing, the first normally closed contact is located outside the housing, and the second normally closed contact and the time-delay operating structure are located inside the housing.

[0017] Based on the contactor provided in the embodiment, by integrating the second normally closed contact and the time-delay operating structure, for the contactor, in some cases, only the accessory formed by the second normally closed contact and the time-delay operating structure needs to be added to realize the protection of the coil in the contactor, which has the advantage of saving cost.

[0018] In a possible design, the time-delay operating structure further comprises a lever. The second normally closed contact comprises a second static contact and a second moving contact in contact. The housing comprises 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 further provided with a fulcrum for supporting the lever.

[0021] In the contactor provided by the embodiment, the bimetallic strip and the second normally closed contact are arranged side by side in the housing along the first direction, and the bimetallic strip drives the second movable contact through the lever. The layout structure helps to reduce the size of the housing in the first direction, and in some cases, facilitates the installation of the overall structure formed by the second normally closed contact and the time-delay operating structure.

[0022] In a possible design, the housing further comprises a first support portion and a second support portion for mounting the second movable contact. The first support portion and the second support portion are stationary, and are arranged along a second direction and have a spacing therebetween. The second direction is perpendicular to the first direction and parallel to the plane on which the bottom portion lies.

[0023] In the second direction, the second movable contact comprises a support, a tension spring and a movable contact piece. In the first direction, the movable contact piece comprises a first abutting portion, a second abutting portion and a connecting portion between the first abutting portion and the second abutting portion.

[0024] In the second direction, one end of the support is rotationally connected to the first support portion, and the other end of the support is hooked to the connecting portion of the movable contact piece through the tension spring. The first abutting portion and the second abutting portion abut against the second support portion, respectively.

[0025] In the contactor provided by the embodiment, the second movable contact comprises a support, a tension spring and a movable contact piece. The tension spring is arranged between the support and the movable contact piece, and can function as a force transmitter to enable the movable contact piece to contact or separate from the second stationary contact. In addition, in the present application, the tension spring has another important function, i.e., when the second normally closed contact is in the closed state, the tension spring enables the movable contact piece to tightly contact the second stationary contact. When the second normally closed contact is in the open state, the tension spring enables the movable contact piece to stably separate from the second stationary contact. In this way, the reliability of the coil protection assembly is improved, the coil is better protected from damage, and the reliability of the contactor is improved.

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

[0027] The reset knob is mounted through the cover and can rotate relative to the cover. The reset knob comprises a first reset surface and a second reset surface in the housing. In the direction from the cover to the bottom portion, the first reset surface is closer to the movable contact point of the movable contact piece than the second reset surface.

[0028] The reset knob comprises an automatic reset state and a manual reset state. In the automatic reset state, the first reset surface is opposite to the movable contact point, and the second reset surface deviates from the movable contact point. In the manual reset state, the second reset surface is opposite to the movable contact point, and the first reset surface deviates from the movable contact point.

[0029] Based on the contactor provided in this embodiment, the reset knob includes a first reset surface and a second reset surface with a height difference. Utilizing the structural combination of the first reset surface, the second reset surface, and the second movable contact with a tension spring, the second normally closed contact can be manually closed and automatically closed after being disconnected. Thus, in actual applications, the operating mode of the reset knob can be selected based on the use environment and operating conditions of the contactor. For example, in an unattended outdoor environment, the automatic mode can be selected to minimize interference with the normal operation of the contactor 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 includes a first end and a second end. The first end of the resistance wire is electrically connected to the bimetallic strip, and the second end of the resistance wire is electrically connected to the second wire. The second wire extends out of the housing and is used 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 since 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, the other end of the electrical connection plate is fixed and electrically connected to the first connection end, and 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 on 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 inventive concept, the application further provides a coil protection accessory, comprising the second normally closed contact and the time-delay operation structure of any one of the above.

[0040] The second aspect comprises the second normally closed contact and the time-delay operation structure of the first aspect, and the beneficial effects of the second aspect can refer to the beneficial effects brought by the first aspect and the possible embodiments of the first aspect, which will not be repeated here. BRIEF DESCRIPTION OF DRAWINGS

[0041] Figure 1 The initial state diagram of the contactor provided by the embodiment of the application under the condition that the moving iron core is normally attracted.

[0042] Figure 2 The final state diagram of the contactor provided by the embodiment of the application under the condition that the moving iron core is normally attracted.

[0043] Figure 3 The initial state diagram of the contactor provided by the embodiment of the application under the condition that the moving iron core cannot be normally attracted due to the under-voltage of the coil.

[0044] Figure 4 The final state diagram of the contactor provided by the embodiment of the application under the condition that the moving iron core cannot be normally attracted due to the under-voltage of the coil.

[0045] Figure 5 The structure schematic diagram of a coil protection accessory provided by the embodiment of the application.

[0046] Figure 6 The assembly structure schematic diagram of the coil protection accessory and the contactor body provided by the embodiment of the application.

[0047] Figure 7 The structure schematic diagram of Figure 5 The structure schematic diagram from another perspective.

[0048] Figure 8 The structure schematic diagram of Figure 5 The exploded structure schematic diagram.

[0049] Figure 9 The closed state schematic diagram of the coil protection accessory provided by the embodiment of the application in the manual reset mode.

[0050] Figure 10 The open state schematic diagram of the coil protection accessory provided by the embodiment of the application in the manual reset mode.

[0051] Figure 11 The closed state schematic diagram of the coil protection accessory provided by the embodiment of the application in the automatic reset mode.

[0052] Figure 12The schematic view of the coil protection accessory in the open state of the automatic reset mode provided by the embodiment of the present application.

[0053] Wherein the reference signs are:

[0054] 1. An electromagnetic system; 11, a moving iron core; 12, a stationary iron core; 13, a coil; 131, a second external lead; 132, a third external lead;

[0055] 2. A coil protection assembly;

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

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

[0058] 23. A time delay operation structure; 231, a resistance wire; 2311, a first end; 2312, a second end; 232, a bimetallic strip; 233, a lever; 234, a first lead; 235, a second lead; 236, a third lead; 237, an electric connection plate; 238, a first connecting lead; 239, a second connecting lead;

[0059] 24. A housing; 241, a bottom; 242, a first support portion; 243, a second support portion; 244, a housing cover;

[0060] 25. A reset knob; 251, a first reset surface; 252, a second reset surface; A, a contactor body; B, a coil protection accessory. DETAILED DESCRIPTION

[0061] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0062] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. All publications, patent applications, patents, and other references mentioned herein are incorporated by reference in their entirety.

[0063] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase "in an embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily all directed to the same embodiment, or to one or more feature or characteristic of an embodiment. One of ordinary skill in the art will readily recognize from the disclosure herein a wide number of variations of the embodiments described herein that can be made and used in various embodiments of the application.

[0064] In addition, the terms "first", "second", and the like, herein, whether used in the description of the application or the right claims, are not used to denote or otherwise identify any particular or specific order, magnitude or amount, but are merely used for the purpose of nomenclature to distinguish one element from another. The terms "comprises", "comprising", "includes", "including" and the like can be used herein, and also mean including but not limited to as set out herein.

[0065] In the description of the application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connected" should be understood in a broad sense, for example, the "connection" or "connection" of mechanical structure can mean physical connection, for example, the physical connection can be fixed connection, for example, fixed connection by spacer, for example, fixed connection by screw, bolt or other spacer. The physical connection can also be detachable connection, for example, mutual clamping or clamping connection. The physical connection can also be integrally connected, for example, welding, bonding or integrally formed connection. For those skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

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

[0067] Figure 1 The initial state diagram of the contactor provided by the embodiment of the application under the condition that the moving iron core is normally attracted, 2 is the final state diagram of the contactor provided by the embodiment of the application under the condition that the moving iron core is normally attracted, Figure 3 The initial state diagram of the contactor provided by the embodiment of the application under the condition that the moving iron core cannot be normally attracted due to under-voltage of the coil, Figure 4 The final state diagram of the contactor provided by the embodiment of the application under the condition that the moving iron core cannot be normally attracted due to under-voltage of the coil.

[0068] Please refer to Figures 1 to 4The contactor provided in this 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 time-delay operation structure 23 .

[0070] The first normally closed contact 21 includes a first stationary contact 212, a first movable contact 213, and a contact support 211. The first stationary contact 212 is in contact with the first movable contact 213, the contact support 211 is linked to the movable iron core 11, and the first movable contact 213 is linked to the contact support 211. The time-delay operation mechanism 23 includes both electrical and mechanical components.

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

[0072] The entire 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] When powered on, the electrical part converts electrical energy into the deformation capacity of the mechanical part. If the moving iron core 11 is abnormally attracted, the mechanical part can open the second normally closed contact 22 by deforming itself. Furthermore, the mechanical part can recover its deformation after the electrical part is powered off.

[0074] Specifically, the working principle of the electromagnetic system 1 is: when the coil 13 is energized, a magnetic field is generated, 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 factors such as the magnetic field establishment time, hysteresis effect, and mechanical inertia, when the coil 13 is normally energized, the moving iron core 11 will not immediately attract the static iron core 12, but will only attract 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 static iron core 12, the first normally closed contact 21 is always in the energized state. When the moving iron core 11 moves toward the static iron core 12, the first moving contact 213 separates from the first static contact 212, and the first normally closed contact 21 is de-energized. In this way, the energized time of the first normally closed contact 21 can reflect the state of the moving iron core 11. When the energized time of the first normally closed contact 21 exceeds the predetermined attraction time T1, it indicates that the attraction of the moving iron core 11 is abnormal.

[0076] In the present application, the abnormal attraction of the moving iron core 11 refers to the situation that the moving iron core 11 does not attract the static iron core 12 within a predetermined attraction time when the coil 13 is energized.

[0077] It can also be understood that, in the present application, the time delay 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, and is used to convert electrical energy into the deformation ability of the mechanical part. When the predetermined attraction time T1 is exceeded, the mechanical part disconnects the second normally closed contact 22, so as to realize the protection of the coil 13.

[0078] Please refer to Figure 1 and Figure 2 , Figure 1 and Figure 2 reflect the normal attraction process of the moving iron core 11 and the static iron core 12 in the contactor. Please refer to Figure 1 , the normal working voltage of the coil 13 is U1. In the initial energized state of the coil 13, the energized time is less than T1, and the moving iron core 11 and the static iron core 12 have not 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 static iron core 12 are attracted.

[0079] From Figure 1 and Figure 2 , it can be seen that in the normal attraction situation, the first normally closed contact 21 is disconnected due to the movement of the moving iron core 11, and the time delay operation structure 23 is also disconnected. Therefore, the time delay operation structure 23 will not disconnect the second normally closed contact 22, and the second normally closed contact 22 always remains in the closed state, and the coil 13 will not be disconnected.

[0080] Figure 3 and Figure 4 reflect the abnormal attraction process of the moving iron core 11 and the static iron core 12 in the contactor. 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, and the situation is similar to that shown in Figure 1 , in the initial state of the coil 13 being energized, the moving iron core 11 and the static iron core 12 have not been attracted.

[0081] Please refer to Figure 4After the coil 13 is energized for a period of time T1, if 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 time delay operating structure 23 is also always in an energized state. The electrical part continuously converts electrical energy into the deformation ability of the mechanical part. After the period of time T1, the mechanical part breaks the second normally closed contact 22 through its own deformation, thereby cutting off the power supply of the coil 13 and the electrical part of the time delay operating structure 23, and avoiding the phenomenon of overheating of the coil 13 and the static iron core 12. After the electrical part of the time delay operating structure 23 is powered off, the mechanical part gradually recovers the deformation.

[0082] It should be noted that there are many implementation modes of the time delay operating structure 23 of the present application, and the bimetallic strip 232 shown in Figures 1 to 4 is not limited thereto. As long as the structure can convert electrical energy into deformation ability and has a time delay action, it is acceptable. For example, the time delay operating structure 23 can also be an electromagnetic structure controlled air bag assembly. In the electromagnetic structure controlled air bag assembly, the electrical part is an electromagnetic structure, and the mechanical part is an air bag. The contraction and expansion of the air bag is controlled by the electromagnetic structure, so that the air bag can control the second normally closed contact 22. The time required for the air bag to expand from the contracted state to the state capable of breaking the second normally closed contact 22 can be designed as T1, so that the function of breaking the second normally closed contact 22 in the case of abnormal attraction of the moving iron core 11 can be realized.

[0083] In summary, the contactor provided by the present application includes the electromagnetic system 1 and the coil protection assembly 2. The coil protection assembly 2 includes the first normally closed contact 21, the second normally closed contact 22 and the time delay operating structure 23. Through the cooperation of the first normally closed contact 21, the second normally closed contact 22 and the time delay operating structure 23, the moving iron core 11 and the coil 13, the power supply of the coil 13 can be cut off in time in the case of abnormal attraction of the moving iron core 11, so that the phenomenon of overheating of the coil 13 and the static iron core 12 can be avoided, and the coil 13 can be protected from damage caused by overheating.

[0084] In addition, the contactor provided by the present application adopts a coil protection assembly 2 structure which is relatively simple and has a low cost. The coil protection assembly 2 realizes protection of a product and the coil 13 with a relatively high cost at a relatively low cost, and can reduce the risk of fire.

[0085] It should be noted that in the present application, the case of abnormal attraction of the moving iron core 11 includes both the case where the working voltage of the coil 13 is insufficient to cause the moving iron core 11 to fail to be attracted, and the case where the moving iron core 11 fails to be attracted due to foreign matter being stuck. Figures 3 to 4 The protection principle of the coil protection assembly 2 for the coil 13 in the case where the moving iron core 11 fails to be attracted due to foreign matter being stuck is the same as the protection principle shown in . Details are not repeated 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 the resistance wire 231, and the mechanical part includes the 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 closing time, the deformation of the bimetallic strip 232 can trigger the second normally closed contact 22 to be disconnected.

[0087] Specifically, in this embodiment, the time delay operation structure 23 includes the bimetallic strip 232 and the resistance wire 231. When the coil 13 is powered, the resistance wire 231 will heat up and heat the bimetallic strip 232. With the increase of temperature, the bimetallic strip 232 will deform, and when the heating time reaches T1, the deformation of the bimetallic strip 232 can trigger the first normally closed contact 21 to be disconnected.

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

[0089] Figure 5 A structure diagram of a coil protection accessory provided by an embodiment of the present application is shown in Figure 6 A structure diagram of a coil protection accessory provided by an embodiment of the present application is shown in

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

[0091] Specifically, some contactor bodies A have the first normally closed contact 21, and the coil protection assembly 2 can work by means of the first normally closed contact 21 possessed by the contactor body A itself. 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 of the contactor body A for use.

[0092] Based on the structural features of the contactor, in some embodiments of the present application, only the second normally closed contact 22 is integrated with the time-delay operating structure 23, so that for the contactor, only the coil protection accessory B formed by the second normally closed contact 22 and the time-delay operating structure 23 needs to be added to realize the protection of the coil 13 in the contactor, which has the advantage of saving cost.

[0093] Figure 7 For Figure 5 the structural schematic diagram from another perspective, Figure 8 For Figure 5 the exploded structural schematic diagram.

[0094] Please refer to Figure 5 , Figure 7 and Figure 8 , in some embodiments of the present application, the time-delay operating structure 23 further includes a lever 233. The second normally closed contact 22 includes a second stationary contact 221 and a second movable contact 222 in contact. 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 in which the bottom 241 is located.

[0096] The lever 233 is arranged 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 by this embodiment, in the case of abnormal attraction of the moving iron core 11, the bimetallic strip 232 deforms, presses one end of the lever 233, and the other end of the lever 233 drives the second movable contact 222, so that the second movable contact 222 and the second stationary contact 221 are separated. The bimetallic strip 232 and the second normally closed contact 22 are arranged side by side in the housing 24 along the first direction, and the bimetallic strip 232 drives the second movable contact 222 through the lever 233, which 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 time-delay operating structure 23.

[0098] Please continue to refer to Figure 5 , Figure 7 and Figure 8In some embodiments of the present application, the housing 24 further comprises a first support portion 242 and a second support portion 243 for mounting the second movable contact 222, the first support portion 242 and the second support portion 243 are fixed parts, the first support portion 242 and the second support portion 243 are arranged along a second direction, and the first support portion 242 and the second support portion 243 have a spacing therebetween, the second direction is perpendicular to the first direction and parallel to the plane on which the bottom portion 241 lies.

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

[0100] In the second direction, one end of the support member 2221 is rotationally connected with the first support portion 242, 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] Figure 9 A schematic view of the coil protection accessory in the closed state of the manual reset mode provided by the embodiments of the present application, Figure 10 A schematic view of the coil protection accessory in the open state of the manual reset mode provided by the embodiments of the present application.

[0102] Please refer to Figure 5 , Figure 7 , Figure 9 and Figure 10 In this embodiment, the second movable contact 222 comprises the support member 2221, the tension spring 2222 and the movable contact piece 2223, wherein the support member 2221 is rotationally connected with the first support portion 242, the tension spring 2222 is located between the support member 2221 and the movable contact piece 2223, thus, when the movable iron core 11 is attracted abnormally, the lever 233 will lift the support member 2221, the support member 2221 will rotate relative to the first support portion 242, the support member 2221 will drive the movable contact piece 2223 through the tension spring 2222, so that the movable contact piece 2223 rotates relative to the second support portion 243, thereby realizing the separation of the movable contact piece 2223 and the second stationary contact 221.

[0103] It can be understood that in this embodiment, the tension spring 2222 is arranged between the support 2221 and the movable contact 2223, and the tension spring 2222 can play a force transmission role, so that the movable contact 2223 can be in contact with or separated from the second static contact 221. In addition, another important role of arranging 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 2223 tightly contact with the second static contact 221. When the second normally closed contact 22 is in the open state, the tension spring 2222 can make the movable contact 2223 maintain a stable separation state from the second static contact 221.

[0104] Specifically, referring to Figure 9 and Figure 10 , the following three position relationships exist between the tension spring 2222 and the movable contact 2223:

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

[0106] Second: the axis C2 of the tension spring 2222 is located below the geometric central axis C1 of the movable contact 2223, at this time, the tension spring 2222 has a downward pulling force on the movable contact 2223, so that the movable contact 2223 can tightly contact with the second static contact 221, and thus, it is helpful 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 central axis C1 of the movable contact 2223, at this time, the tension spring 2222 has an upward pulling force on the movable contact 2223, and thus, it is helpful to maintain the open state of the second normally closed contact 22.

[0108] It can be understood that in this application, the second support part 243 arranged in the shell 24, the first abutting part 22231 and the second abutting part 22232 arranged on the movable contact 2223, are helpful to realize the above-mentioned role of the tension spring 2222.

[0109] Figure 11 The schematic view of the coil protection accessory provided by the embodiment of the application in the closed state of the automatic reset mode, Figure 12 The schematic view of the coil protection accessory provided by the embodiment of the application in the open state of the automatic reset mode.

[0110] Referring to Figures 9 to 12 , in some embodiments of the application, the shell 24 further comprises 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 acting surface of the reset knob 25 is located in the shell 24, and the acting surface includes a first reset surface 251 and a second reset surface 252. In the direction from the shell cover 244 to the bottom 241, the first reset surface 251 is closer to the movable contact 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 movable contact on the movable contact 2223, and the second reset surface 252 is deviated from the movable contact. In the manual reset state, the second reset surface 252 is opposite to the movable contact of the movable contact 2223, and the first reset surface 251 is deviated from the movable contact of the movable contact 2223.

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

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

[0115] Please refer to Figure 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 movable contact. Please refer to Figure 12 In the automatic mode, when the second normally closed contact 22 is disconnected due to the abnormal attraction of the movable iron core 11, the movable contact 2223 rotates towards the first reset surface 251 during the process of the movable contact 2223 being disconnected from the second static contact 221. When the movable contact 2223 touches the first reset surface 251, it will be subjected to a reverse force from the first reset surface 251, so that the movable contact on the movable contact 2223 recontacts the static contact on the second static contact 221, 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 the first reset surface 251 and the second reset surface 252 with a height difference. By using the structure combination of the first reset surface 251, the second reset surface 252 and the second movable contact 222 with the tension spring 2222 described above, manual closing and automatic closing of the second normally closed contact 22 after disconnection can be achieved.

[0117] In practical application, it is found that the abnormal attraction of the moving iron core 11 is sometimes caused by under-voltage and sometimes caused by foreign matter jam. The under-voltage sometimes occurs during the peak period of electricity use, and after the peak period of electricity use, the voltage will return to normal. The foreign matter jam can also be eliminated by the attraction and disconnection of the moving iron core 11. Therefore, in practical 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 no one in charge in the wild, the automatic mode can be selected, so as to try not to affect the normal work of the contactor on the basis of protecting the coil 13.

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

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

[0120] The electric resistance wire 231 comprises a first end 2311 and a second end 2312, the first end 2311 of the electric resistance wire 231 is electrically connected with the bimetallic strip 232, the second end 2312 of the electric resistance wire 231 is electrically connected with the second wire 235, and the second wire 235 extends out of the shell 24 for being connected in parallel with the coil 13.

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

[0122] Specifically, please refer to Figure 6 Based on the contactor provided in the embodiment, the time delay operation structure 23 can realize the electrical connection between 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 both extend out of the shell 24, so that when the coil protection accessory B composed of the second normally closed contact 22 and the time delay operation structure 23 is connected with the contactor body A, the part of the first wire 234 and the second wire 235 extending out of the shell 24 can be connected with the contactor body A; if the part of the first wire 234 and the second wire 235 extending out of the shell 24 is short, a first connecting wire 238 can be arranged at the first wire 234 to connect the bimetallic strip 232 and the first normally closed contact 21 in series at a certain distance through the first connecting wire 238, and a second connecting wire 239 can be arranged at the second wire 235 to connect the electric resistance wire 231 and the coil 13 in parallel at a certain distance through the second connecting wire 239.

[0123] As can be seen from the above, based on the contactor provided by the embodiment, the time delay operation structure 23 can realize the electrical connection between 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 since the first wire 234 and the second wire 235 both extend out of the shell 24, thus facilitating the wiring between the coil protection accessory B constituted by the second normally closed contact 22 and the time delay 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 fixed contact 221 is fixed to the bottom 241 of the shell 24, and the second fixed contact 221 is connected to the first external wire 2211 through the wiring screw 2212, so that the 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 through 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 with the contactor body A, not only the electrical connection between the coil protection accessory B formed by the time delay operation structure 23 and the second normally closed contact 22 and the contactor body A is needed, but also the parallel connection between the first normally closed contact 21 and the coil 13 is needed. Specifically, in some embodiments of the present application, a third external wire 132 can be provided to parallelly connect the first normally closed contact 21 and the coil 13 which are separated by a certain distance.

[0126] Please continue to refer to Figure 8 In some embodiments of the present application, the time delay operation structure 23 further comprises an electrical connection plate 237.

[0127] In the second direction, the bimetallic strip 232 comprises a first connecting end and a second connecting end, one end of the electrical connection plate 237 is electrically connected with the first wire 234, and the other end of the electrical connection plate 237 is fixedly and electrically connected with the first connecting end. The second connecting end is in contact with the lever 233.

[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. Under the condition of being heated, the first connecting end is fixed, and the second connecting end can bend towards the lever 233 relative to the first connecting end, so that 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 first end 2311 of the electric resistance wire 231 is close to the second connecting end, and the second end 2312 of the electric resistance wire 231 is close to the first connecting end.

[0130] Based on the same inventive concept, the present application further provides a coil protection accessory B comprising any of the second normally closed contact 22 and the time delay operation structure 23. The coil protection accessory B comprises the second normally closed contact 22 and the time delay operation structure 23, and the beneficial effects of the coil protection accessory B can refer to the beneficial effects of the second normally closed contact 22 and the time delay operation structure 23, which will not be repeated here.

[0131] Those skilled in the art can understand that, although some embodiments herein include certain features rather than other features included in other embodiments, the combination of features of different embodiments means to be within the scope of the present application and form different embodiments. For example, in the claims, any one of the claimed embodiments can be used in any combination.

[0132] The above-described embodiments are only used to illustrate the technical solutions of the present application, rather than limit them. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part of the technical features. And these modifications or replacements do not make the essence of the corresponding technical solutions deviate 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 includes a moving iron core, a static iron core and a coil, wherein the moving iron core and the static iron core are arranged opposite to each other; the coil is arranged on the static 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 includes a first static contact, a first movable contact, and a contact support; wherein the first static contact contacts the first movable contact, the contact support is linked to the movable iron core, and the first movable contact is linked to the contact support; the time-delay operation structure includes an electrical part and a mechanical part; The first normally closed contact is connected in series with the electrical part; the entire structure of the first normally closed contact and the electrical part 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 is capable of converting electrical energy into the deformation capacity of the mechanical part when powered on; the mechanical part is capable of disconnecting the second normally closed contact by deforming itself when the moving iron core is abnormally attracted; and the mechanical part is capable of restoring its deformation after the electrical part is powered off; 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; The coil protection assembly further includes a housing, wherein the second normally closed contact and the time-delay operation structure are located in the housing; 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.

2. The contactor according to claim 1, characterized in that The first normally closed contact is located outside the housing.

3. The contactor according to claim 1, wherein: The housing is further provided with a first supporting portion and a second supporting portion for mounting the second movable contact member, the first supporting portion and the second supporting portion being stationary members, the first supporting portion and the second supporting portion being arranged along a second direction, and a distance being provided between the first supporting portion and the second supporting portion, the second direction being perpendicular to the first direction and parallel to the plane of the bottom of the housing; Along the second direction, the second movable contact member includes a support member, a tension spring and a movable contact piece; along the first direction, the movable 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 are respectively abutted against the second support portion.

4. The contactor according to claim 3, characterized in that The housing further includes 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 mounted through the housing cover and is rotatable relative to the housing cover. The reset knob includes a first reset surface and a second reset surface located within the housing. Along the direction from the housing 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.

5. The contactor according to claim 2, characterized in that: The delay operation structure further 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 be connected in series with the first normally closed contact; The resistance wire includes 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.

6. The contactor according to claim 5, characterized in that The time-delay operation structure further includes an electrical connection plate; Along the second direction, the bimetallic strip includes a first connecting end and a second connecting 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 connecting end; the second connecting end is in contact with the lever; the second direction is perpendicular to the first direction and parallel to the plane where the bottom of the shell is located.

7. The contactor according to claim 6, 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.

8. A coil protection accessory, characterized in that: It includes the housing, the second normally closed contact, the delayed operation structure and the matching connection relationship between the three as described in any one of claims 1 to 7.

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