An electromagnetic relay with auxiliary contacts

Abstract

The present invention discloses an electromagnetic relay with auxiliary contacts, comprising a base and a contact system and magnetic circuit system disposed on the base. The contact system comprises a main contact unit and an auxiliary contact unit. The main contact unit and the auxiliary contact unit are configured to cooperate with the armature of the magnetic circuit system and to switch the contact on / off state by the rotational movement of the armature. The main contact unit and the auxiliary contact unit have the same contact on / off switching action. When the magnetic circuit system is energized and the armature rotates forward, the auxiliary contact unit first forms an engaged conductive state, followed by the main contact unit. When the magnetic circuit system is de-energized and the armature automatically resets and rotates in the reverse direction, the main contact unit first disconnects, followed by the auxiliary contact unit. In the electromagnetic relay of the present invention, when the magnetic circuit system is de-energized and the main contact unit is abnormally adhered, even if the armature partially rotates and resets, the auxiliary contact unit always maintains the same engaged conductive state as the main contact unit, thereby achieving reliable monitoring.

Description

Technical Field

[0001] The present invention relates to the technical field of relays, and in particular to an electromagnetic relay with auxiliary contacts. Background Art

[0002] Chinese document CN211125515U (application date: July 28, 2020) discloses a snap-on electromagnetic relay with auxiliary contacts, including a base, a magnetic circuit part and a contact part; the magnetic circuit part includes a coil, an armature, an iron core and a yoke; the contact part includes a movable spring (active spring), a static spring (main static spring), an auxiliary movable spring and an auxiliary static spring; the movable spring is fixedly connected to the armature through an insulating part, and the movable spring and the armature are respectively located in front and behind the insulating part to form electrical isolation, the static spring and the auxiliary static spring are installed on the base, the movable spring is provided with an active contact, the static spring is provided with a main static contact, and the auxiliary static spring is provided with an auxiliary static contact. The auxiliary movable spring is partially embedded in the insulating part and partially extends out from the side of the insulating part. The auxiliary movable spring is provided with an auxiliary movable contact. When the armature and the iron core are attracted, the active contact engages with the corresponding main static contact, and at the same time, the auxiliary movable contact engages with the corresponding auxiliary static contact. However, when the electromagnetic relay of this technical solution is connecting and disconnecting a large load, the active contact and the main static contact may be abnormally stuck and unable to disconnect. In this way, when the magnetic circuit is partially powered off, the armature will reset and rotate due to the lack of magnetic attraction. However, because the active contact and the main static contact are stuck together (equivalent to the main contact unit remaining in the connected state), the armature will not return to its initial state. However, the abnormally reset armature will undoubtedly return to a certain angle with the auxiliary moving spring, thus causing the auxiliary moving contact to separate from the auxiliary static contact (equivalent to the auxiliary contact unit forming a disconnected state).

[0003] Electromagnetic relays are automatic switching elements with isolation functions at the input and output ends. They are widely used in many fields such as communications, automobiles, automatic control, and household appliances, and are one of the most important control elements. As an important component of the relay, the working reliability of the contact system greatly affects the life and safety of the product. Therefore, achieving reliable monitoring of the contact system is of great significance to improving the performance and safety of the product. As mentioned above, the existing conventional electromagnetic relays with normally open auxiliary contact units can use the auxiliary contact units to monitor the on and off states of the main contact units. However, they do not take into account that when the main contact unit fails to bond (an arc is generated during the contact bounce and heats the contact surface to form a metal molten pool. When the contact is closed, the molten pool cools to form a weld, which causes the contact unit to bond). There may be unreliable monitoring problems caused by the main contact unit being in the on state and the auxiliary contact unit being in the off state, making it impossible to guarantee the safety and reliability of the product. Summary of the Invention

[0004] In response to the deficiencies of the prior art, the present invention provides an electromagnetic relay with auxiliary contacts, which mainly solves the problem that the existing conventional electromagnetic relay with a normally open auxiliary contact unit does not take into account the unreliable monitoring problem caused by the main contact unit being in the on state and the auxiliary contact unit being in the off state when the main contact unit fails in bonding, making it impossible to ensure the safety and reliability of the product.

[0005] To achieve the above object, the present invention is achieved through the following technical solutions:

[0006] An electromagnetic relay with auxiliary contacts, comprising a base and a contact system and a magnetic circuit system arranged on the base, wherein the contact system comprises a main contact unit and an auxiliary contact unit, wherein the main contact unit and the auxiliary contact unit are configured to cooperate with the armature of the magnetic circuit system and the contact on-off state switching is controlled by the rotational movement of the armature, wherein the contact on-off switching action of the main contact unit and the auxiliary contact unit is the same, and when the magnetic circuit system is energized to cause the armature to rotate forward, the total angle of the forward rotation and the reverse reset rotation of the armature are both defined as A, and the armature is defined to rotate forward from the initial state position until the auxiliary contact unit first forms engagement The rotation angle of the intermediate state position of conduction is B, and the rotation angle of the armature continuing to rotate forward from the intermediate state position until the main contact unit forms the working state position of engagement and conduction is defined as C, then B+C=A, when the magnetic circuit system is powered off and the armature automatically resets in the reverse direction, the abnormal rotation angle of the armature caused by the abnormal adhesion of the main contact unit during the reverse reset rotation is defined as D, and C is configured to be greater than D, so that when the magnetic circuit system is powered off and the main contact unit is abnormally bonded, even if the armature partially rotates and resets, the auxiliary contact unit always remains in the engaged and conductive state.

[0007] Furthermore, the main contact unit includes an active spring and a main static spring arranged in correspondence with each other on the base, and the active spring and the main static spring are respectively provided with an active contact and a main static contact that cooperate with each other. The auxiliary contact unit includes an auxiliary moving spring and an auxiliary static spring arranged in correspondence with each other on the base, and the auxiliary moving spring and the auxiliary static spring are respectively provided with an auxiliary moving contact and an auxiliary static contact that cooperate with each other. The active spring and the auxiliary moving spring are configured to cooperate with the armature respectively, and the rotational movement of the armature is used to switch and control the on-off state of the contact of the main contact unit and the auxiliary contact unit.

[0008] Furthermore, the active reed is connected to the armature, the main static reed is fixedly mounted on the base, the active contact and the main static contact are arranged corresponding to each other, the auxiliary moving reed and the auxiliary static reed are both fixedly mounted on the base, the auxiliary moving contact and the auxiliary static contact are arranged corresponding to each other, and the rotational movement of the armature is used to control the movement of the active reed and the auxiliary moving reed, thereby switching the contact on / off states of the main contact unit and the auxiliary contact unit.

[0009] Furthermore, the auxiliary movable spring is configured to have a movement tendency to automatically approach the auxiliary static spring and engage and conduct the auxiliary movable contact and the auxiliary static contact. A driving portion is formed on the armature, and the driving portion is overlapped with the bottom position of the auxiliary movable spring on the side facing the auxiliary static spring. When the armature is in the initial position, the auxiliary movable spring is lifted by the driving portion to disconnect the auxiliary movable contact and the auxiliary static contact. When the armature rotates forward to drive the active spring to approach the main static spring to engage and conduct the active contact and the main static contact, the driving portion of the armature releases the lifting effect on the auxiliary movable spring, so that the auxiliary movable spring automatically resets and approaches the auxiliary static spring to engage and conduct the auxiliary movable contact and the auxiliary static contact.

[0010] Furthermore, the armature is an L-shaped bending structure formed by bending and connecting a first bending plate and a second bending plate, the driving part is formed on the first bending plate, and the active spring is connected to the second bending plate.

[0011] Furthermore, an insulating sleeve is provided on the driving part, and the driving part is overlapped at the bottom position of the auxiliary dynamic spring through the insulating sleeve.

[0012] Furthermore, the magnetic circuit system includes an armature, a yoke, and a coil component installed with an iron core and enameled wire. The coil component is placed upright on the base, the yoke is connected to the iron core, the armature is fitted at the edge of the yoke and fits with the iron core, and a reset spring is provided between the armature and the yoke for automatically resetting the armature.

[0013] Furthermore, the angular difference between C and D is defined as E, where E = 2.2° to 3.8°.

[0014] Furthermore, the on-off switching action of the main contact unit and the auxiliary contact unit is the same, which means that when the armature is in the initial state position, the main contact unit and the auxiliary contact unit simultaneously maintain the disconnected state, and when the armature moves to the working state position, the main contact unit and the auxiliary contact unit simultaneously maintain the engaged conductive state.

[0015] Furthermore, the on-off switching timing of the main contact unit and the auxiliary contact unit is configured as follows: when the armature is in the initial state position, the main contact unit and the auxiliary contact unit are both in the disconnected state; when the magnetic circuit system is energized to cause the armature to rotate forward, the auxiliary contact unit first forms engagement and conduction, and the main contact unit forms engagement and conduction later; and when the magnetic circuit system is de-energized and the armature automatically reverses and resets and rotates, the main contact unit first disconnects, and the auxiliary contact unit disconnects later.

[0016] The above technical solution has the following advantages or beneficial effects:

[0017] In the electromagnetic relay with auxiliary contacts described in the present invention, the contact on-off switching actions of the main contact unit and the auxiliary contact unit of the electromagnetic relay are the same, and when the armature is in the initial state, the main contact unit and the auxiliary contact unit are both in the disconnected state. When the magnetic circuit system is energized to cause the armature to rotate forward, the auxiliary contact unit first forms engagement and conduction, and the main contact unit forms engagement and conduction later; and when the magnetic circuit system is de-energized and the armature automatically reverses and resets and rotates, the main contact unit first disconnects and the auxiliary contact unit disconnects later. The most important thing is that C is configured to be greater than D, that is, when the magnetic circuit system is de-energized to cause the armature to automatically reverse and reset and rotate, The abnormal rotation angle D of the armature that is caused by abnormal adhesion of the main contact unit and partial rotation and reset is smaller than the rotation angle C of the armature that continues to rotate forward from the intermediate state position until the main contact unit forms the engaged and conductive working state position. In this way, when the main contact unit is abnormally adhered, the armature that rotates abnormally to reset does not return to the range of motion that can drive the auxiliary contact unit to disconnect, so that the auxiliary contact unit can still maintain the engaged and conductive state without being driven by the armature to disconnect. Finally, the on-off state of the auxiliary contact unit is consistent with that of the main contact unit to achieve reliable monitoring. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the three-dimensional structure of the electromagnetic relay according to an embodiment of the present invention.

[0019] Figure 2 2 is a schematic diagram of the three-dimensional structure of the electromagnetic relay according to an embodiment of the present invention from another angle.

[0020] Figure 3 yes Figure 2 AA section view in.

[0021] Figure 4 It is a schematic diagram of the assembly structure of the armature and the active spring according to an embodiment of the present invention.

[0022] Figure 5 This is a schematic diagram of the on-off switching timing principle of an embodiment of the present invention. Figure 1 (Initial state).

[0023] Figure 6 This is a schematic diagram of the on-off switching timing principle of an embodiment of the present invention. Figure 2 (The auxiliary contact unit first engages the intermediate state of conduction).

[0024] Figure 7 This is a schematic diagram of the on-off switching timing principle of an embodiment of the present invention. Figure 3 (Auxiliary contact unit and main contact unit are both engaged and conductive working state).

[0025] Figure 8 This is a schematic diagram of the on-off switching timing principle of an embodiment of the present invention. Figure 4(The armature normally resets and rotates in the reverse direction to the critical state where it will control the auxiliary contact unit to disconnect).

[0026] Figure 9 This is a schematic diagram of the on-off switching timing principle of an embodiment of the present invention. Figure 5 (The main contact unit is abnormally bonded and the armature is abnormally rotated in the reverse direction).

[0027] Figure 10 yes Figure 8 The critical state and Figure 9 Schematic diagram of armature position change in abnormal rotation state.

[0028] Description of labels:

[0029] 1. Base, 2. Main contact unit, 3. Auxiliary contact unit, 4. Armature, 5. Yoke, 6. Coil component, 21. Active reed, 22. Main static reed, 23. Active contact, 24. Main static contact, 31. Auxiliary moving reed, 32. Auxiliary static reed, 33. Auxiliary moving contact, 34. Auxiliary static contact, 41. Driving unit, 42. First bending plate, 43. Second bending plate, 44. Insulating sleeve, 311. Long convex rib. DETAILED DESCRIPTION

[0030] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0031] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as limiting the present invention.

[0032] Please refer to the attached Figure 1 To the attached Figure 9An embodiment of the present invention provides an electromagnetic relay with auxiliary contacts, comprising a base 1 and a contact system and a magnetic circuit system arranged on the base 1, wherein the contact system comprises a main contact unit 2 and an auxiliary contact unit 3, wherein the main contact unit 2 and the auxiliary contact unit 3 are configured to cooperate with the armature 4 of the magnetic circuit system and the contact on-off state switching is controlled by the rotation movement of the armature 4, the contact on-off switching action of the main contact unit 2 and the auxiliary contact unit 3 is the same, and when the magnetic circuit system is energized to cause the armature 4 to rotate forward, the total angle of the forward rotation and the reverse reset rotation of the armature 4 are defined as A, and the intermediate state position of the armature 4 from the initial state position forward rotation until the auxiliary contact unit 3 first forms an engaged conductive state is defined. The rotation angle of the armature 4 is set as B, and the rotation angle of the armature 4 continuing to rotate forward from the intermediate state position until the main contact unit 2 forms the engaged and conductive working state position is defined as C, then B+C=A, when the magnetic circuit system is powered off and the armature 4 automatically resets in the reverse direction, the abnormal rotation angle of the armature 4 caused by the abnormal adhesion of the main contact unit 2 during the reverse reset rotation is defined as D, and C is configured to be greater than D, so that when the magnetic circuit system is powered off and the main contact unit 2 is abnormally adhered, even if the armature 4 partially rotates and resets, the auxiliary contact unit 3 always maintains the engaged and conductive state. Preferably, the angle difference between C and D is defined as E, then E is configured to be =2.2°~3.8°. The on-off switching action of the main contact unit 2 and the auxiliary contact unit 3 is identical, meaning that when the armature 4 is in the initial position, the main contact unit 2 and the auxiliary contact unit 3 simultaneously maintain the disconnected state, and when the armature 4 moves to the working position, the main contact unit 2 and the auxiliary contact unit 3 simultaneously maintain the engaged conductive state. In this embodiment, the on-off switching timing of the main contact unit 2 and the auxiliary contact unit 3 is configured as follows: when the armature 4 is in the initial position, the main contact unit 2 and the auxiliary contact unit 3 are both in the disconnected state; when the magnetic circuit system is energized to cause the armature 4 to rotate in the forward direction, the auxiliary contact unit 3 first forms the engaged conductive state, and the main contact unit 2 forms the engaged conductive state later; when the magnetic circuit system is de-energized and the armature 4 automatically returns to the reverse position, the main contact unit 2 first opens, and the auxiliary contact unit 3 opens later.

[0033] It can be understood that, in this embodiment, the contact on-off switching actions of the main contact unit 2 and the auxiliary contact unit 3 of the electromagnetic relay are the same, and when the armature 4 is in the initial state position, the main contact unit 2 and the auxiliary contact unit 3 are both in the disconnected state. When the magnetic circuit system is energized to cause the armature 4 to rotate forward, the auxiliary contact unit 3 is first engaged and conductive, and the main contact unit 2 is later engaged and conductive; and when the magnetic circuit system is de-energized and the armature 4 automatically rotates in the reverse direction, the main contact unit 2 is disconnected first, and the auxiliary contact unit 3 is later disconnected. The most important thing is that C is configured to be greater than D, that is, when the magnetic circuit system is de-energized to cause the armature 4 to automatically rotate in the reverse direction, the main contact unit 2 is disconnected. The abnormal rotation angle D of the armature 4 caused by abnormal adhesion of the contact unit 2 is smaller than the rotation angle C of the armature 4 that continues to rotate forward from the intermediate state position until the main contact unit 2 forms the engaged and conductive working state position. In this way, when the main contact unit 2 is abnormally adhered, the armature 4 that rotates abnormally to reset does not return to the range of motion that can drive the auxiliary contact unit 3 to disconnect, so that the auxiliary contact unit 3 can still maintain the engaged and conductive state without being driven to disconnect by the armature 4. Finally, the on-off state of the auxiliary contact unit 3 is consistent with that of the main contact unit 2 to achieve a reliable monitoring effect.

[0034] Please refer to the attached Figure 1 To the attached Figure 9 In one preferred embodiment, the main contact unit 2 includes an active spring 21 and a main static spring 22 corresponding to each other on the base 1, and the active spring 21 and the main static spring 22 are respectively provided with an active contact 23 and a main static contact 24 that cooperate with each other. The auxiliary contact unit 3 includes an auxiliary movable spring 31 and an auxiliary static spring 32 corresponding to each other on the base 1, and the auxiliary movable spring 31 and the auxiliary static spring 32 are respectively provided with an auxiliary movable contact 33 and an auxiliary static contact 34 that cooperate with each other. The active spring 21 and the auxiliary movable spring 31 are configured to cooperate with the armature 4 respectively, and the rotational movement of the armature 4 is used to switch the on-off state of the contact of the main contact unit 2 and the auxiliary contact unit 3.

[0035] Please refer to the attached Figure 1 To the attached Figure 9In one preferred embodiment, the active spring 21 is connected to the armature 4, the main static spring 22 is fixedly mounted on the base 1, the active contact 23 and the main static contact 24 are arranged corresponding to each other, the auxiliary dynamic spring 31 and the auxiliary static spring 32 are both fixedly mounted on the base 1, the auxiliary dynamic contact 33 and the auxiliary static contact 34 are arranged corresponding to each other, and the rotational movement of the armature 4 is used to control the movement of the active spring 21 and the auxiliary dynamic spring 31, thereby switching the contact on / off states of the main contact unit 2 and the auxiliary contact unit 3. In one of the preferred embodiments, the auxiliary movable spring 31 is preferably configured to have a movement tendency to automatically approach the auxiliary static spring 32 and engage and connect the auxiliary movable contact 33 and the auxiliary static contact 34. A driving portion 41 is formed on the armature 4, and the driving portion 41 is overlapped at the bottom position of the auxiliary movable spring 31 facing the auxiliary static spring 32. When the armature 4 is in the initial position, the auxiliary movable spring 31 is lifted by the driving portion 41 so that the auxiliary movable contact 33 and the auxiliary static contact 34 are disconnected. When the armature 4 rotates forward to drive the active spring 21 to approach the main static spring 22 so that the active contact 23 and the main static contact 24 are engaged and connected, the driving portion 41 of the armature 4 releases the lifting effect on the auxiliary movable spring 31, so that the auxiliary movable spring 31 automatically resets and approaches the auxiliary static spring 32 so that the auxiliary movable contact 33 and the auxiliary static contact 34 are engaged and connected. However, those skilled in the art should understand that in other embodiments, the driving portion 41 and the auxiliary movable spring 31 may also be coordinated in other forms and are not limited to the specific implementation methods disclosed in this embodiment. For example, the auxiliary static contact 34 may be configured to be higher than the auxiliary movable contact 33, and the auxiliary movable spring 31 is bent so that it has a movement tendency to automatically approach the auxiliary static spring 32. The driving portion 41 of the armature 4 presses down the auxiliary movable spring 31 in the initial state so that the auxiliary movable contact 33 and the auxiliary static contact 34 are disconnected, thereby forming a normally open contact structure of the auxiliary contact unit 3. When the magnetic circuit system is energized, the armature 4 rotates forward and drives the active spring 21 to approach the main static spring 22. At the same time, the driving portion 41 gradually releases the initial downward pressure on the auxiliary movable spring 31, that is, the driving portion 41 gradually rises. In this way, the auxiliary movable spring 31 gradually rebounds under the action of its own elastic force and approaches the auxiliary static spring 32.

[0036] Please refer to the attached Figure 1 To the attached Figure 9 In one preferred embodiment, the armature 4 has an L-shaped bent structure formed by bending and connecting a first bent plate 42 and a second bent plate 43. The driving portion 41 is formed on the first bent plate 42, and the active spring 21 is connected to the second bent plate 43. It can be understood that in this embodiment, because the armature 4 has an L-shaped bent structure, the active spring 21 is connected to the second bent plate 43, and the driving portion 41 is formed on the first bent plate 42, the main contact unit 2 and the auxiliary contact unit 3 of the contact system can be separated and arranged as far away from each other as possible to avoid mutual interference.

[0037] Please refer to the attached Figure 1 In one preferred embodiment, an insulating sleeve 44 is provided over the driving portion 41, and the driving portion 41 is overlapped with the bottom of the auxiliary movable spring 31 through the insulating sleeve 44. The insulating sleeve 44 increases the electrical and creepage distance between the coil and the auxiliary movable spring, thereby improving the safety and stability of the electromagnetic relay.

[0038] Please refer to the attached Figure 1 In one preferred embodiment, a long rib 311 is provided on the top of the auxiliary movable spring 31 to enhance its rigidity. The long rib 311 corresponds to the overlapped position between the auxiliary movable spring 31 and the driving unit 41. In this embodiment, the addition of the long rib 311 on the auxiliary movable spring 31 effectively enhances its rigidity. When the driving unit 41 strikes the auxiliary movable spring 31, the auxiliary movable spring 31 does not swing excessively due to excessive flexibility, effectively preventing the auxiliary movable contact from re-engaging with the auxiliary static contact during the disconnection process.

[0039] Please refer to the attached Figure 1 In one preferred embodiment, the magnetic circuit system includes an armature 4, a yoke 5, and a coil assembly 6 mounted with an iron core and enameled wire. The coil assembly 6 is vertically positioned on the base 1. The yoke 5 is connected to the iron core. The armature 4 fits within the blade edge of the yoke 5 and also fits within the iron core. A reset spring is provided between the armature 4 and the yoke 5 for automatically resetting the armature 4. It will be understood that the overall structure of the magnetic circuit system in this embodiment is conventional, and the specific structure can be designed with reference to the prior art CN210182306U and CN111653454A.

[0040] In addition, the main structure of the electromagnetic relay of the present invention can be designed with reference to the prior art CN210182306U (an electromagnetic relay with auxiliary contacts) or CN111653454A (an electromagnetic relay with auxiliary contacts). The difference is that the auxiliary contact unit of the electromagnetic relay disclosed in the above-mentioned prior art CN210182306U and CN111653454A is a normally closed structure, that is, the auxiliary contact unit has a tendency to automatically reset and engage after the external force is removed. Therefore, when the magnetic circuit system is energized to attract the armature and the iron core, the main contact unit of the electromagnetic relay is engaged and conductive, and the driving part on the armature presses down the auxiliary movable spring of the auxiliary contact unit, thereby disconnecting the auxiliary movable contact from the auxiliary static contact. When the magnetic circuit system is de-energized and the armature is reset, the main contact unit is in the disconnected state, while the auxiliary contact unit is in the engaged and conductive state. In other words, the contact on-off switching actions of the main contact unit and the auxiliary contact unit are opposite. In contrast, the auxiliary contact unit 3 of the present invention is a normally open structure. The driving part of the armature lifts the auxiliary moving spring instead of pressing it down. The driving part lifts the auxiliary moving spring to combine and conduct the auxiliary moving contact with the auxiliary static contact.Furthermore, in the present invention, as to how to configure C to be greater than D, one of the preferred implementations is: first, the main structure of the electromagnetic relay can be designed with reference to the existing technologies CN210182306U and CN111653454A, and the size of the disconnecting gap between the active contact and the main static contact of the main contact unit 2, the stiffness of the active spring 21, the total rotation angle A of the armature 4, the reset force of the reset spring of the armature 4, etc. can all be determined as non-variable parameters according to the specific design requirements of the electromagnetic relay. Then, the abnormal situation in which the magnetic circuit system is powered off and the main contact unit is bonded is designed to calculate the abnormal rotation angle of the armature 4 (since the above-mentioned main non-variable parameters are specifically designed, the abnormal rotation angle D can be considered as a fixed value and can be measured). Specifically, the active contact and the main static contact of the main contact unit 2 can be bonded together to simulate the abnormal bonding situation by means of gluing or welding, and then the magnetic circuit system is disconnected. If the armature 4 is powered, the armature 4 will automatically rotate and reset under the reset force of the reset spring. However, since the active contact and the main static contact are bonded, the active spring 21 connected to one end of the armature 4 will pull the armature 4 and prevent the armature 4 from resetting. Then, under the interaction between the active spring 21 and the reset spring of the armature, the armature 4 will eventually rotate to a certain angle and then remain at a certain angle position and remain stable. After the armature 4 is stable, the rotation angle of the armature 4 can be calculated by measuring the rotation angle of the armature 4, and the above-mentioned abnormal rotation angle can be obtained. D, and because C = AB, if C is to be greater than D, then AB>D, and therefore B<AD. In this formula, A and D are both constant values ​​that can be measured and calculated. Therefore, the maximum value of B can be specifically calculated (combined with the angular difference between C and D being E = 2.2°~3.8°, the optimal value of B can be calculated). Then, based on the calculated value of B, the size of the disconnecting gap between the auxiliary main contact and the auxiliary static contact of the auxiliary contact unit 3 and the matching distance between the drive part of the armature and the auxiliary moving spring can be reasonably designed.

[0041] The embodiments described above are only used to illustrate the technical solutions of the present invention, rather than to limit them. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate from the spirit and scope of the technical solutions of the embodiments of the present invention. Therefore, all other embodiments obtained by those skilled in the art without making any creative work shall fall within the scope of protection of the present invention.

Claims

1. An electromagnetic relay with auxiliary contacts, comprising a base (1) and a contact system and a magnetic circuit system arranged on the base (1), characterized in that: The contact system comprises a main contact unit (2) and an auxiliary contact unit (3). The main contact unit (2) and the auxiliary contact unit (3) are configured to cooperate with an armature (4) of a magnetic circuit system and to control the switching of the contact on-off state by the rotation of the armature (4). The main contact unit (2) and the auxiliary contact unit (3) have the same contact on-off switching action. When the magnetic circuit system is energized to cause the armature (4) to rotate in the forward direction, the total angle of the forward rotation and the reverse reset rotation of the armature (4) are both defined as A. The rotation angle of the armature (4) from the initial state position to the intermediate state position where the auxiliary contact unit (3) first forms an engagement conduction is defined. The angle of rotation of the armature (4) from the intermediate state position to the working state position where the main contact unit (2) forms an engaged and conductive state is defined as C, and when the magnetic circuit system is powered off and the armature (4) automatically resets and rotates in the reverse direction, the abnormal rotation angle of the armature (4) due to the abnormal adhesion of the main contact unit (2) during the reverse reset rotation is defined as D, and C is configured to be greater than D, so that when the magnetic circuit system is powered off and the main contact unit (2) is abnormally adhered, even if the armature (4) is partially rotated and reset, the auxiliary contact unit (3) always maintains the engaged and conductive state.

2. The electromagnetic relay with auxiliary contacts according to claim 1, characterized in that: The main contact unit (2) comprises an active spring (21) and a main static spring (22) which are arranged on the base (1) in a corresponding manner, and an active contact (23) and a main static contact (24) which cooperate with each other are respectively provided on the active spring (21) and the main static spring (22). The auxiliary contact unit (3) comprises an auxiliary moving spring (31) and an auxiliary static spring (32) which are arranged on the base (1) in a corresponding manner, and an auxiliary moving contact (33) and an auxiliary static contact (34) which cooperate with each other are respectively provided on the auxiliary moving spring (31) and the auxiliary static spring (32). The active spring (21) and the auxiliary moving spring (31) are configured to cooperate with the armature (4) respectively, and the contact on / off states of the main contact unit (2) and the auxiliary contact unit (3) are switched and controlled by the rotational movement of the armature (4).

3. The electromagnetic relay with auxiliary contacts according to claim 2, characterized in that: The active spring (21) is connected to the armature (4), the main static spring (22) is fixedly mounted on the base (1), the active contact (23) and the main static contact (24) are arranged correspondingly to each other, the auxiliary movable spring (31) and the auxiliary static spring (32) are both fixedly mounted on the base (1), the auxiliary movable contact (33) and the auxiliary static contact (34) are arranged correspondingly to each other, and the rotational movement of the armature (4) is used to control the movement of the active spring (21) and the auxiliary movable spring (31), thereby switching the contact on / off states of the main contact unit (2) and the auxiliary contact unit (3).

4. The electromagnetic relay with auxiliary contacts according to claim 3, characterized in that: The auxiliary moving spring (31) is configured to have a movement tendency of automatically approaching the auxiliary static spring (32) and making the auxiliary moving contact (33) and the auxiliary static contact (34) engage and conduct. A driving part (41) is formed on the armature (4). The driving part (41) is overlapped at the bottom position of the auxiliary moving spring (31) on the side facing the auxiliary static spring (32). When the armature (4) is in the initial state, the auxiliary moving spring (31) is lifted by the driving part (41) so that the auxiliary moving contact (33) and the auxiliary static contact (34) are engaged and conducted. When the armature (4) rotates forward to drive the active spring (21) to approach the main static spring (22) so that the active contact (23) and the main static contact (24) are engaged and connected, the driving portion (41) of the armature (4) releases the lifting effect on the auxiliary movable spring (31), so that the auxiliary movable spring (31) automatically returns to its original position and approaches the auxiliary static spring (32), and the auxiliary movable contact (33) and the auxiliary static contact (34) are engaged and connected.

5. The electromagnetic relay with auxiliary contacts according to claim 4, characterized in that: The armature (4) is an L-shaped bent structure formed by bending and connecting a first bent plate (42) and a second bent plate (43); the driving portion (41) is formed on the first bent plate (42); and the active spring (21) is connected to the second bent plate (43).

6. The electromagnetic relay with auxiliary contacts according to claim 5, characterized in that: An insulating sleeve (44) is sleeved on the driving portion (41), and the driving portion (41) is overlapped at the bottom position of the auxiliary movable spring piece (31) through the insulating sleeve (44).

7. The electromagnetic relay with auxiliary contacts according to claim 1, characterized in that: The magnetic circuit system comprises an armature (4), a yoke (5), and a coil component (6) equipped with an iron core and an enameled wire. The coil component (6) is vertically placed on a base (1). The yoke (5) is connected to the iron core. The armature (4) is fitted at the edge of the yoke (5) and the iron core. A reset spring for automatically resetting the armature (4) is provided between the armature (4) and the yoke (5).

8. The electromagnetic relay with auxiliary contacts according to claim 1, characterized in that: The angular difference between C and D is defined as E, then E = 2.2° to 3.8°.

9. The electromagnetic relay with auxiliary contacts according to any one of claims 1 to 8, characterized in that: The on-off switching actions of the main contact unit (2) and the auxiliary contact unit (3) are the same, which means that when the armature (4) is in the initial state position, the main contact unit (2) and the auxiliary contact unit (3) simultaneously maintain the disconnected state, and when the armature (4) moves to the working state position, the main contact unit (2) and the auxiliary contact unit (3) simultaneously maintain the engaged conductive state.

10. The electromagnetic relay with auxiliary contacts according to claim 9, characterized in that: The on-off switching sequence of the main contact unit (2) and the auxiliary contact unit (3) is configured as follows: when the armature (4) is in the initial state, the main contact unit (2) and the auxiliary contact unit (3) are both in the disconnected state; when the magnetic circuit system is energized to cause the armature (4) to rotate in the forward direction, the auxiliary contact unit (3) first forms an engaged conduction, and the main contact unit (2) forms an engaged conduction later; and when the magnetic circuit system is de-energized and the armature (4) automatically resets and rotates in the reverse direction, the main contact unit (2) first disconnects, and the auxiliary contact unit (3) disconnects later.

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