CN116844919B - Electromagnetic relay capable of being rapidly broken - Google Patents

Abstract

The invention belongs to the technical field of electromagnetic relays and provides a quick-breaking electromagnetic relay, which includes a lower housing, an upper housing and a connecting body. A first electromagnetic driving device is provided in the lower housing, and a moving reed is provided in the upper housing. There are multiple groups of current-carrying contact components. Each group of current-carrying contact components forms an independent circuit loop after being connected to the load. Each group of current-carrying contact components includes a normally open contact and a common contact. The first electromagnetic driving device is driven by the first push rod. The moving reed moves so that the common contact contacts the normally open contact; the normally open contact has a trip component and a locking component. When a current exceeding a specified value flows through the normally open contact, the trip component drives the normally open contact The normally open contact is disconnected from the common contact, and the normally open contact in the normally open contact is locked and fixed by the locking assembly; the invention has the advantages of flexible control, high safety, and quick response.

Description

A fast breaking electromagnetic relay

Technical field

The invention belongs to the technical field of electromagnetic relays, and specifically relates to a fast breaking electromagnetic relay.

Background technique

An electromagnetic relay is an electronic control device. It has a control system (also called an input circuit) and a controlled system (also called an output circuit). It is usually used in automatic control circuits. It actually uses low voltage and weak current circuits. On-off, an "automatic switch" to control high voltage and strong current.

Generally speaking, a simple electromagnetic relay consists of a coil assembly, a movable armature and one or more sets of contacts, that is, single-throw system, double-throw system, etc. These contact sets include movable contacts, fixed normally open contacts and fixed normally closed contacts. The armature is mechanically connected to one or more sets of moving contacts and is held in place by a spring.

In the prior art, the safety of the circuit is protected by installing a fuse in the circuit. Specifically, when a large current passes through the dynamic and static contacts of the high-voltage DC relay, electric repulsion will be generated. At this time, the upper magnetic conductive block and the lower magnetic conductive block will generate an attractive force, which offsets the electric repulsive force to ensure that the dynamic and static contacts will not bounce off. Buy reaction time for the fuse of the circuit, and rely on the fuse to blow to cut off the circuit current and play a protective role.

In order not to install additional fuses in the circuit and ensure that the electromagnetic relay can quickly break, electromagnetic relays that rely on dynamic and static contacts to realize automatic and rapid disconnection of dynamic and static contacts through excessive current have emerged:

For example, the Chinese invention patent application publication number CN115692107A discloses a high-voltage DC relay with quick response breaking. By fixing the second magnetic conductive block to the push rod, when the static contact contacts the moving reed and passes a large current, A magnetic attraction force in the same direction as the electric repulsion force between the static contact and the moving reed is generated between the first magnetic conductive block and the second magnetic conductive block, accelerating the springing of the moving and static contacts and blocking the current rise; the rapid response of the present invention The breaking high-voltage DC relay does not require additional fuses and is low-cost; at the same time, it reduces fault points and is safer; the technical solution adopted by the present invention has a simple structure, fast response speed, and has high practical value;

Another example is that the Chinese invention patent application publication number CN105493220A discloses an electromagnetic relay. The electromagnetic relay has an electromagnet device, a contact device and a tripping device. The electromagnet device has a first fixed part, a movable part and a first excitation coil. The contact device has a movable contact and a fixed contact; the trip device has a second excitation coil; the electromagnet device moves the movable member from the first position to the second position; when the flow of the second excitation coil of the trip device exceeds a prescribed value When the current reaches the current, the tripping device uses the second magnetic flux generated by the second excitation coil to move the movable element to the third position. When the movable element is in the first position and the third position, the electromagnetic relay is in an open state; when the movable element is in the second position, the electromagnetic relay is in a closed state; thus, the movable element is realized by the setting of the tripping device. moving from the second position of the closed state to the third position of the open state to open the circuit;

Although the electromagnetic relay in the prior art can quickly disconnect the circuit when a large current flows through the moving and static contacts, once it is disconnected, the end of the circuit controlled by the electromagnetic relay will be disconnected, which is not suitable for a The electromagnetic relay controls multiple circuits through multiple sets of contacts. Once the current increases due to a fault in one circuit, the entire electromagnetic relay will be completely disconnected, and other circuits will not be able to operate normally, thus affecting the work of the entire circuit.

Contents of the invention

In view of the shortcomings of the existing technology, the present invention provides a fast-breaking electromagnetic relay, which solves the problem raised in the above background technology. When a certain circuit loop among multiple circuit loops controlled by the electromagnetic relay causes an increase in current due to a fault, When it is large, only this circuit loop is disconnected, and other circuit loops maintain normal operation.

The technical solution of the present invention is as follows:

A quick-breaking electromagnetic relay includes a lower housing, an upper housing and a connecting body. A first electromagnetic driving device is provided in the lower housing, and a moving reed and multiple sets of current-carrying contact assemblies are provided in the upper housing. , each group of the current-carrying contact components forms an independent circuit loop after being connected to the load. Each group of the current-carrying contact components includes a normally open contact that is detachably installed on the upper housing and a contact that is disposed on the moving reed. Common contact, the first electromagnetic driving device drives the moving reed through the first push rod to move, so that the common contact and the normally open contact piece;

The normally open contact includes a wiring piece removably installed on the upper housing, a normally open contact provided on the wiring piece, a tripping component and a locking component provided in the wiring piece. In a normal state Down, the normally open contact part protrudes from the wiring piece. When the normally open contact flows with a current exceeding a specified value, the trip component drives the normally open contact to retract the wiring piece, and the The locking component is locked and fixed.

Further, the wiring piece is provided with a first installation cavity, the trip assembly is installed in the first installation cavity, the trip assembly includes a second electromagnetic driving device, and the second electromagnetic driving device includes a second fixed iron. core, a second excitation coil wound around the outer circumference of the second fixed iron core, and a second moving part, the normally open contact is installed on the second moving part, and one terminal of the second excitation coil is connected On the normally open contact, the other terminal of the second excitation coil is fixed on the wiring piece. When the second excitation coil flows with a current exceeding a specified value, the electromagnetic force generated by the second fixed iron core Driving the second moving member drives the normally open contact to move upward.

Preferably, the second fixed iron core is located on the upper side of the second moving part, and a second elastic spring is provided between the second fixed iron core and the second moving part. Under the action of elastic force, the normally open contact part protrudes from the wiring member. When the second excitation coil flows with a current exceeding a prescribed value, the second fixed iron core generates an electromagnetic force to the second moving member. The adsorption force is greater than the elastic force of the second elastic spring to drive the second moving member to drive the normally open contact to move upward.

Optionally, the second fixed iron core is located on the lower side of the second moving part, the second moving part is a permanent magnet, and the second moving part communicates with the normally open contact through a second push rod. connection, when the second excitation coil is supplied with current, the opposite ends of the second moving member and the second fixed iron core have the same polarity, and when the second excitation coil flows with a current exceeding a specified value, The second fixed iron core pushes the second moving part to move upward.

Further, both terminals of the second excitation coil are electrically connected to conductive pieces, one of which is connected with the normally open contact in a frictional manner, and the other conductive piece is located in the wiring groove on the top of the wiring member.

Further, the locking assembly includes a third elastic spring, a push plate and a gear lever. The gear lever is fixed on one side of the push plate, and one end of the third elastic spring resists the other side of the push plate. On one side, under the elastic force of the third elastic spring, the end of the gear lever conflicts with the side surface of the normally open contact.

Further, the lower end of the wiring member is provided with a detachable end cover, a second installation cavity is provided in the end cover, the locking assembly is installed in the second installation cavity, and the third elastic spring The other end is against the left wall of the second installation cavity. A through hole is provided in the middle of the end cover for the normally open contact to pass through. The end of the gear lever is removed from the second installation cavity. The right side wall of the cavity penetrates into the through hole.

Further, the locking assembly further includes a traction member, one end of the traction member is fixed on the push plate, and the other end of the traction member passes through the side wall of the upper housing.

Further, the first electromagnetic driving device includes a first fixed iron core, a first excitation coil wound around the outer circumference of the first fixed iron core, and a first moving part. The first moving part is fixed on the first pusher. One end of the rod, the moving reed is fixed on the other end of the first push rod, when current flows through the first excitation coil, the magnetic force generated by the first fixed iron core drives the first moving part Drive the moving reed to move upward.

Preferably, the first fixed iron core is located on the lower side of the first moving part, and the first moving part is a permanent magnet. When the first excitation coil is supplied with current, the first fixed iron core The opposite end of the first moving member has the same polarity, and the first fixed core pushes the first moving member to move upward.

Compared with the prior art, the beneficial effects of the present invention are as follows:

1. The electromagnetic relay provided by the present invention can independently control multiple circuit loops controlled by the electromagnetic relay, and a trip component is separately provided for the wiring member of each circuit loop, so that when the multiple circuit loops controlled by the electromagnetic relay When any one of the through currents is too large, the circuit loop can be quickly disconnected independently without affecting the normal operation of other circuit loops controlled by the electromagnetic relay, thereby achieving flexible control of multiple circuit loops controlled by the same electrical relay;

2. In the present invention, a locking component is provided on each wiring component. When a normally open contact in a certain circuit loop is returned to the wiring component due to excessive current, it is locked and fixed by the locking component. It prevents the tripping component from losing the driving force to the normally open contact and causing the normally open contact to contact the corresponding public contact again, effectively improving the safety of the circuit loop;

In short, the present invention has the advantages of flexible control, high safety and rapid response.

Description of the drawings

Figure 1 is a schematic structural diagram of the electromagnetic relay provided in Embodiment 1;

Figure 2 is a schematic structural diagram of a normally open contact provided in Embodiment 1;

Figure 3 is a partially enlarged schematic diagram of position A in Figure 2;

Figure 4 is a partially enlarged schematic diagram of B in Figure 2;

Figure 5 is a schematic structural diagram of a normally open contact provided in Embodiment 2;

Figure 6 is a schematic structural diagram of the first electromagnetic driving device provided in Embodiment 3.

In the picture: 1. Lower housing, 2. Upper housing, 3. Connector, 4. Moving reed, 5. Normally open contact, 501. Wiring piece, 502. Normally open contact, 503. Trip component, 5031. The second fixed iron core, 5032. The second excitation coil, 5033. The second moving part, 5034. The second elastic spring, 5035. The second push rod, 504. Locking component, 5041. The third elastic spring, 5042 , push plate, 5043, gear lever, 5044, traction piece, 505, end cover, 506, side cover, 6. Normally closed contact, 7. Common contact, 8. First fixed iron core, 9. First excitation Coil, 10. First moving part, 11. Conductive piece, 12. Wiring slot, 13. Mounting frame, 14. First elastic spring.

Implementation

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, rather than all the embodiments.

Example

As shown in Figure 1, a quick-breaking electromagnetic relay includes a lower housing 1, an upper housing 2 and a connecting body 3. The connecting body 3 is fixed on the lower housing 1, and the upper housing 2 Fixed on the connecting body 3, the lower part of the inner wall of the upper housing 2 is provided with a mounting bracket 13, the lower housing 1 is provided with a first electromagnetic driving device, and the upper housing 2 is provided with a moving Reed 4 and multiple groups of current-carrying contact components. Each group of current-carrying contact components forms an independent circuit after being connected to a load. Each group of current-carrying contact components includes a normally open removable contact assembly mounted on the upper housing 2. The contact piece 5, the normally closed contact 6 installed on the mounting bracket 13 and the common contact 7 provided on the moving reed 4, the first electromagnetic driving device drives the moving reed through the first push rod 4 moves so that the common contact 7 is in contact with the normally open contact 5 or the normally closed contact 6; the normally open contact 5 is located directly above the normally closed contact 6, and the common contact 7 is located at the normally closed contact 6. Between the open contact 5 and the normally closed contact 6, when the first electromagnetic driving device is not energized, the common contact 7 is in contact with the normally closed contact 6;

As shown in Figure 2, the normally open contact 5 includes a wiring piece 501 removably installed on the upper housing 2, a normally open contact 502 provided on the wiring piece 501, and a normally open contact 502 provided on the wiring piece 501. There is a trip component 503 and a locking component 504 inside. Under normal conditions, the normally open contact 502 partially protrudes from the wiring member 501. When a current exceeding a specified value flows through the normally open contact 502, the The trip component 503 drives the normally open contact 502 to receive the return wiring component 501, and is locked and fixed by the locking component 504;

The wiring piece 501 is threadedly connected to the upper casing 2. The wiring piece 501 is partially located outside the upper casing 2 and partially located inside the upper casing 2. The wiring piece 501 is located outside the upper casing 2. 501 is provided with a wiring slot 12, which is used to connect the terminals of the load; the wiring piece 501, the moving spring 4 and the mounting bracket 13 are all made of insulating materials, for example, the wiring piece 501 is made of ceramic or hard plastic. or other hard insulating materials; the normally open contacts 502, the normally closed contacts 6 and the common contacts 7 are all made of conductive materials.

As shown in Figure 2, the portion of the wiring member 501 located inside the upper housing 2 is provided with a first installation cavity, and the trip assembly 503 is installed in the first installation cavity. The trip assembly 503 includes a second electromagnetic Driving device, the second electromagnetic driving device includes a second fixed iron core 5031, a second excitation coil 5032 wound around the outer circumference of the second fixed iron core 5031, and a second moving part 5033. The normally open contact 502 is installed On the second moving part 5033, one terminal of the second excitation coil 5032 is connected to the normally open contact 502, and the other terminal of the second excitation coil 5032 is fixed on the terminal 501. When the When a current exceeding a predetermined value flows through the second excitation coil 5032, the electromagnetic force generated by the second fixed iron core 5031 drives the second moving member 5033 to drive the normally open contact 502 to move upward, thereby causing the normally open contact to move upward. 502 is no longer in contact with the common contact 7 to disconnect the corresponding circuit.

As shown in Figure 2, the second fixed iron core 5031 is located on the upper side of the second moving part 5033, and a second elastic spring 5034 is provided between the second fixed iron core 5031 and the second moving part 5033. Both ends of the second elastic spring 5034 respectively resist the second fixed iron core 5031 and the second moving member 5033. Under the elastic force of the second elastic spring 5034, the normally open contact 502 partially protrudes. In the wiring member 501, when a current exceeding a predetermined value flows through the second excitation coil 5032, the electromagnetic attraction force generated by the second fixed iron core 5031 to the second moving member 5033 is greater than that of the second elastic spring 5034. The elastic force drives the second moving member 5033 to drive the normally open contact 502 to move upward;

In this embodiment, the second moving part 5033 is a second moving iron core, and a mounting hole is provided in the middle of the lower end of the second moving part 5033. The normally open contact 502 is threadedly connected in the mounting hole, and the An insulating layer (not shown in the figure) is provided on the inner wall of the mounting hole to prevent the second moving part 5033 from being electrified after the normally open contact 502 is energized;

In this embodiment, the wiring slot 12 of the wiring member 501 and the first installation cavity are connected by a first threading hole. The second fixed iron core 5031 is provided with a second threading hole. The second excitation One end of the coil 5032 enters the wiring slot 12 from the first wiring hole, and the other end of the second excitation coil 5032 penetrates the second wiring hole and then the second moving member 5033 and is connected to the normally open contact 502;

In this embodiment, the lower end of the second moving member 5033 is provided with a convex edge, the second elastic spring 5034 is against the convex edge, and the lower end of the second fixed iron core 5031 is provided with a slot. , when the current flowing in the second excitation coil 5032 exceeds the specified value, the electromagnetic force generated by the second fixed iron core 5031 attracts the second moving part 5033 and drives the normally open contact 502 to move upward, so that the upper end of the second moving part 5033 Insert into the slot; it can be understood that the distance that the second moving member 5033 moves upward is sufficient to ensure that the lower end of the normally open contact 502 is received into the wiring member 501 .

As shown in Figures 2 and 3, both terminals of the second excitation coil 5032 are electrically connected to conductive pieces 11, one of the conductive pieces 11 is connected with the normally open contact 502, and the other conductive piece 11 is located at In the wiring slot 12 on the top of the wiring member 501; specifically, the conductive piece 11 is an elastic conductive piece with an arch in the middle, and the conductive piece 11 that conflicts with the normally open contact 502 is located in the installation hole, and the normally open contact is 502 is threaded into the installation hole, as the normally open contact 502 continues to enter, the contact between the normally open contact 502 and the conductive piece 11 becomes closer to ensure a good conductive effect.

As shown in Figure 4, the locking assembly 504 includes a third elastic spring 5041, a push plate 5042 and a gear lever 5043. The gear lever 5043 is fixed on one side of the push plate 5042. The third elastic spring One end of 5041 conflicts with the other side of the push plate 5042, and under the elastic force of the third elastic spring 5041, the end of the gear lever 5043 conflicts with the side of the normally open contact 502; When the current flowing in the second excitation coil 5032 exceeds the predetermined value, the second fixed iron core 5031 attracts the second moving member 5033 to drive the normally open contact 502 to move upward beyond the horizontal position of the gear lever 5043. After the third elastic spring Under the action of the elastic force of 5041, the gear lever 5043 moves to the right, so that the gear lever 5043 is located on the lower side of the normally open contact 502 to prevent the normally open contact 502 from being disconnected from the common contact 7 and losing current. Under the action of the elastic force, the normally open contact 502 is driven to return to the position where it continues to be in contact with the common contact 7.

As shown in Figures 2 and 4, the lower end of the wiring member 501 is provided with a detachable end cover 505. The end cover 505 can be fixed with threads or screws. A second installation cavity is provided in the end cover 505. , the locking assembly 504 is installed in the second installation cavity, the other end of the third elastic spring 5041 is against the left side wall of the second installation cavity, and there is a hole in the middle of the end cover 505 A through hole for the normally open contact 502 to pass through, and the end of the gear lever 5043 penetrates into the through hole from the right side wall of the second installation cavity;

Specifically, there is an opening on the left side of the second installation cavity, and a side cover 506 fixed by screws is provided at the opening position. The left end of the third elastic spring 5041 is against the side cover 506. When the end of the gear lever 5043 When the normally open contact 502 is in contact with the push plate 5042, there is a certain distance between the push plate 5042 and the right side of the second installation cavity. This distance is enough to ensure that when the normally open contact 502 moves upward beyond the horizontal position of the gear rod 5043, The end of the gear lever 5043 moves to the center position of the normally open contact 502. It can be understood that at this time, the push plate 5042 contacts the right side of the second installation cavity.

As shown in FIGS. 2 and 4 , the locking assembly 504 further includes a traction member 5044 , one end of the traction member 5044 is fixed on the push plate 5042 , and the other end of the traction member 5044 extends from the upper housing 2 The side wall is penetrated; the traction member 5044 is a pull rope. After a circuit trip occurs and the maintenance work is completed, the push plate 5042 can be moved to the left by pulling the traction member 5044 until the end of the gear lever 5043 moves. to the left side of the normally open contact 502, so that the gear lever 5043 no longer blocks the normally open contact 502. Under the elastic force of the second elastic spring 5034, the normally open contact 502 returns to its original position and is in contact with the common contact. 7 contacts.

As shown in Figure 1, the first electromagnetic driving device includes a first fixed iron core 8, a first excitation coil 9 wound around the outer circumference of the first fixed iron core 8, and a first moving member 10. The member 10 is fixed on one end of the first push rod, and the moving reed 4 is fixed on the other end of the first push rod. When current flows in the first excitation coil 9, the first stator The magnetic force generated by the core 8 drives the first moving member 10 to drive the moving reed 4 to move upward;

In this embodiment, the first fixed iron core 8 is located on the upper side of the first moving part 10. The first moving part 10 is a moving iron core. The first fixed iron core 8 has a through hole in the middle. The first push rod is passed through the through hole, and a first elastic spring 14 is set on the outer periphery of the first push rod. One end of the first elastic spring 14 resists the upper side of the first moving member 10. The first elastic spring The other end of 14 is against the top of the lower housing 1. When the first excitation coil 9 is not energized, under the elastic force of the first elastic spring 14, the first moving part 10 is located at the lowest side. At this time, the common contact 7 conflicts with the normally closed contact 6. When the first excitation coil 9 is supplied with current, the first fixed iron core 8 generates a magnetic attraction force on the first moving part 10. This magnetic attraction force overcomes the elastic force of the first elastic spring 14. , causing the first moving member 10 to move upward. When the first moving member 10 moves to contact the first fixed iron core 8 , the common contact 7 conflicts with the normally open contact 502 .

Example

This embodiment is another implementation based on Embodiment 1. The difference between the two is that the relative positions of the second fixed iron core 5031 and the second moving part 5033 in the second electromagnetic driving device are different.

As shown in Figure 5, the second fixed iron core 5031 is located on the lower side of the second moving part 5033. The second moving part 5033 is a permanent magnet. The second moving part 5033 passes through the second push rod 5035. Connected to the normally open contact 502, a mounting hole is provided at the lower end of the second push rod 5035. The normally open contact 502 is threadedly connected in the mounting hole. When the normally open contact 502 is not connected to the common contact 7 In the case of contact (that is, no current passes through the second excitation coil 5032), under the gravity of the second moving part 5033 and its attraction to the second fixed iron core 5031, the second moving part 5033 resists the second fixed iron core 5031. At the upper end of the iron core 5031, when the second excitation coil 5032 passes current, the polarity of the second moving member 5033 and the opposite end of the second fixed iron core 5031 is the same. Under normal operation of the circuit, the second The excitation coil 5032 passes a stable load operating current. When the circuit loop operation is abnormal, the current value passing through the second excitation coil 5032 continues to increase. When the second excitation coil 5032 flows with a current exceeding a predetermined value, the second excitation coil 5032 The repulsive force between the second moving part 5033 and the second fixed iron core 5031 is greater than the sum of the gravity of the second moving part 5033, the second push rod 5035 and the normally open contact 502 itself. The second fixed iron core 5031 pushes the second fixed iron core 5031. The second moving member 5033 moves upward to drive the normally open contact 502 to move upward through the second push rod 5035;

In this embodiment, the second push rod 5035 is made of non-conductive material. In order to increase the weight of the second moving part 5033, the second push rod 5035 and the normally open contact 502, a heavy material can be added to the second push rod 5035. Material to increase the weight of the second push rod 5035.

Example

This embodiment is another implementation based on Embodiment 1. The difference between the two is that the relative positions of the first fixed iron core 8 and the first moving part 10 are different.

As shown in Figure 6, the first fixed iron core 8 is located on the lower side of the first moving part 10. The first moving part 10 is a permanent magnet. When the first excitation coil 9 does not pass current, Under the gravity of a moving part 10, the first moving part 10 resists the first fixed iron core 8. When the first excitation coil 9 passes current, the first fixed iron core 8 and the first fixed iron core 8 are connected to each other. The opposite ends of the moving part 10 have the same polarity, and the repulsive force between the first fixed iron core 8 and the first moving part 10 is greater than the sum of the gravity of the first moving part 10 and the first push rod itself, so that the first fixed iron The core 8 pushes the first moving member 10 to move upward, so that the common contact 7 contacts the normally open contact 502, the circuit loop of the load is connected, and the second excitation coil 5032 passes the working current of the load.

The working process of the present invention is as follows:

Connect the electromagnetic relay provided by the present invention to the circuit loop of the load, and each group of current-carrying contact components of the electromagnetic relay is connected to a load respectively; connect the first excitation coil 9 in the first electromagnetic drive device in the electromagnetic relay to the control loop middle;

The first excitation coil 9 is energized, and the first fixed iron core 8 is magnetized to drive the first moving member 10 to drive the moving reed 4 to move upward, so that the common contact 7 on the moving reed 4 conflicts with the normally open contact 502 to connect the load. circuit loop, the load starts to work, and the second excitation coil 5032 passes current. Although the second fixed iron core 5031 is magnetized at this time, the interaction force between the second fixed iron core 5031 and the second moving part 5033 is not enough to drive The second moving part 5033 moves. When a circuit loop failure of a certain load causes the current in the circuit loop of the load to increase, the magnetic flux of the second excitation coil 5032 increases, and the second fixed iron core 5031 and the second moving part 5033 The interaction force between them increases. When the current in the circuit loop of the load increases to a certain specified value, the second fixed iron core 5031 drives the second moving member 5033 to move upward. During the upward movement of the second moving member 5033 The normally open contact 502 is driven to move upward along the through hole in the middle of the end cover 505. The normally open contact 502 is disconnected from the common contact 7, the circuit is disconnected, and the second excitation coil 5032 no longer flows through the current. Under the action of the third elastic spring 5041, the normally open contact will continue to move upward for a certain distance. When the normally open contact 502 moves to the upper side of the gear lever 5043, the gear lever 5043 moves to the right to the normally open contact under the action of the elastic force of the third elastic spring 5041. Right below the head 502, although no current flows through the second excitation coil 5032 at this time, the second fixed iron core 5031 loses the driving force to drive the second moving member 5033 to move upward. However, due to the existence of the gear lever 5043, the normally open contact The head 502 will not move downward; when the load circuit loop is repaired, just pull the traction piece 5044 corresponding to the load circuit loop, and the gear lever 5043 returns to the original position without blocking the normally open contact 502, and the normally open The contact 502 moves downward and collides with the common contact 7 again to conduct the circuit loop of the load.

The above are only preferred specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person familiar with the technical field can, within the technical scope disclosed in the present invention, implement the technical solutions of the present invention. Equivalent substitutions or changes of the inventive concept thereof shall be included in the protection scope of the present invention.

Claims (10)

1. The electromagnetic relay comprises a lower shell (1), an upper shell (2) and a connecting body (3), wherein a first electromagnetic driving device is arranged in the lower shell (1), a movable reed (4) and a plurality of groups of current-carrying contact assemblies are arranged in the upper shell (2), each group of current-carrying contact assemblies is connected with a load to form an independent circuit loop, each group of current-carrying contact assemblies comprises a normally open contact (5) detachably arranged on the upper shell (2) and a common contact (7) arranged on the movable reed (4), and the first electromagnetic driving device drives the movable reed (4) to move through a first push rod so that the common contact (7) is contacted with the normally open contact (5);

the method is characterized in that:

the normally open contact (5) comprises a wiring piece (501) detachably arranged on the upper shell (2), a normally open contact (502) arranged on the wiring piece (501), a tripping component (503) and a locking component (504) arranged in the wiring piece (501), wherein in a normal state, the normally open contact (502) partially protrudes out of the wiring piece (501), and when the normally open contact (502) flows with current exceeding a specified value, the tripping component (503) drives the normally open contact (502) to be stored in the wiring piece (501) and is locked and fixed by the locking component (504);

the tripping assembly (503) comprises a second electromagnetic driving device, the second electromagnetic driving device comprises a second fixed iron core (5031), a second exciting coil (5032) and a second moving part (5033), the second exciting coil (5032) is wound around the periphery of the second fixed iron core (5031), the normally open contact (502) is installed on the second moving part (5033), one wiring end of the second exciting coil (5032) is connected to the normally open contact (502), the other wiring end of the second exciting coil (5032) is fixed to the wiring part (501), and when current exceeding a specified value flows through the second exciting coil (5032), electromagnetic force generated by the second fixed iron core (5031) drives the second moving part (5033) to drive the normally open contact (502) to move upwards.

2. The electromagnetic relay of claim 1, wherein: the wire connector (501) is provided with a first mounting cavity, and the tripping assembly (503) is mounted in the first mounting cavity.

3. The electromagnetic relay of claim 2, wherein the electromagnetic relay is configured to: the second fixed iron core (5031) is located on the upper side of the second moving part (5033), a second elastic spring (5034) is arranged between the second fixed iron core (5031) and the second moving part (5033), under the elastic action of the second elastic spring (5034), the normally open contact (502) partially protrudes out of the wiring part (501), and when the second exciting coil (5032) flows with current exceeding a specified value, the electromagnetic adsorption force to the second moving part (5033) generated by the second fixed iron core (5031) is larger than the elastic force of the second elastic spring (5034) so as to drive the second moving part (5033) to drive the normally open contact (502) to move upwards.

4. The electromagnetic relay of claim 2, wherein the electromagnetic relay is configured to: the second fixed iron core (5031) is located at the lower side of the second movable element (5033), the second movable element (5033) is a permanent magnet, the second movable element (5033) is connected with the normally open contact (502) through a second push rod (5035), when current is introduced into the second exciting coil (5032), the polarity of the opposite ends of the second movable element (5033) and the polarity of the opposite ends of the second fixed iron core (5031) are the same, and when the current exceeding a specified value flows into the second exciting coil (5032), the second fixed iron core (5031) pushes the second movable element (5033) to move upwards.

5. The electromagnetic relay of claim 2, wherein the electromagnetic relay is configured to: two wiring terminals of the second exciting coil (5032) are electrically connected with conducting strips (11), one conducting strip (11) is in abutting connection with the normally open contact (502), and the other conducting strip (11) is located in a wiring groove (12) at the top of the wiring piece (501).

6. The electromagnetic relay of claim 1, wherein: the locking assembly (504) comprises a third elastic spring (5041), a push plate (5042) and a baffle rod (5043), wherein the baffle rod (5043) is fixed on one side surface of the push plate (5042), one end of the third elastic spring (5041) is abutted to the other side surface of the push plate (5042), and under the elastic action of the third elastic spring (5041), the end part of the baffle rod (5043) is abutted to the side surface of the normally open contact (502).

7. The electromagnetic relay of claim 6 wherein: the lower extreme of wiring piece (501) is provided with detachable end cover (505), be provided with the second installation cavity in end cover (505), locking subassembly (504) are installed in the second installation cavity, the other end of third elastic spring (5041) is contradicted on the left side wall of second installation cavity, the through-hole that supplies normally open contact (502) passed is seted up at the middle part of end cover (505), the tip of shelves pole (5043) is followed the right side wall of second installation cavity penetrates in the through-hole.

8. The electromagnetic relay of claim 6 wherein: the locking assembly (504) further comprises a traction piece (5044), one end of the traction piece (5044) is fixed on the push plate (5042), and the other end of the traction piece (5044) penetrates out of the side wall of the upper shell (2).

9. The electromagnetic relay of claim 1, wherein: the first electromagnetic driving device comprises a first fixed iron core (8), a first exciting coil (9) and a first moving part (10), wherein the first exciting coil (9) is wound on the periphery of the first fixed iron core (8), the first moving part (10) is fixed at one end of the first push rod, the movable reed (4) is fixed at the other end of the first push rod, and when current flows in the first exciting coil (9), the magnetic force generated by the first fixed iron core (8) drives the first moving part (10) to drive the movable reed (4) to move upwards.

10. The fast breaking electromagnetic relay of claim 9, wherein: the first fixed iron core (8) is located at the lower side of the first moving part (10), the first moving part (10) is a permanent magnet, when the first exciting coil (9) is electrified, the polarities of the opposite ends of the first fixed iron core (8) and the first moving part (10) are the same, and the first fixed iron core (8) pushes the first moving part (10) to move upwards.