Large-opening-distance magnetic latching relay
By designing a large-distance dynamic contact and static contact guide structure in the magnetic holding relay, and setting an isolation baffle and exhaust port in the housing, the shortcomings of the existing magnetic holding relay in high current on-off control and heat dissipation are solved, and the reliability and safety of the relay are improved.
Patent Information
- Application Number
- CN202421841185.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-31
- Publication Date
- 2025-05-30
- Estimated Expiration
- 2034-07-31
AI Technical Summary
The distance between the dynamic contacts and static contacts of the existing magnetic holding relays is small, making them difficult to be suitable for high-current on-off control. The absence of an exhaust port in the cover is not conducive to heat dissipation and arc extinguishing, which affects the reliability and safety of use.
A large-distance magnetic relay is designed to directly drive the moving contacts to guide the static contacts through the swing of the magnetic steel assembly, and an isolation baffle is provided in the housing to separate the guide parts from the magnetic steel assembly and the coil assembly, and an exhaust port is added to promote heat dissipation and arc extinguishing.
It realizes a large distance stroke between the moving contact and the static contact, which is suitable for the on-off control of larger currents, avoids the entry of powdered particles into the magnetic steel assembly and coil assembly, improves the reliability and safety of the relay, and extends the service life.
Smart Images
Figure CN222927388U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of relays and is a large-opening magnetic latching relay. Background Art
[0002] A magnetic latching relay is an automatic switch that controls the automatic connection and disconnection of a circuit. Its normally closed and normally open states completely depend on the action of a permanent magnet. The conversion of its switch state is triggered by a pulse signal with a certain width of a coil assembly. For existing magnetic latching relays, such as the one disclosed in the authorized announcement number CN214175946U of the Chinese patent literature, the authorized announcement date is September 10, 2021, and the utility model name is "A Relay". It discloses including a cover shell, a coil assembly, a magnet assembly, a rotor, a swing rod, a moving contact plate, a static contact plate, a static conductive plate, and a flexible wire. The coil assembly drives the magnet assembly to rotate, the magnet assembly drives the swing rod to swing, the swing rod drives the rotor to rotate. When the rotor rotates towards one side, it drives the moving contact at one end of the moving contact plate to form a conduction connection with the static contact of the static contact plate, and the other end of the moving contact plate is conductively connected to the static conductive plate through a flexible wire; when the rotor rotates towards the other side, it drives the moving contact of the moving contact plate to separate from the static contact. Compared with traditional magnetic latching relays, the above solution uses a rotor structure to replace the existing push piece and moving reed, with a relatively simplified structure, small size, and almost no resistance or reaction force during the rotation of the rotor, so the requirements for the electromagnetic assembly are relatively low, and the service life of the magnetic latching relay can be effectively extended. However, in this magnetic latching relay, since the positions where the magnet assembly, the coil assembly are conductively connected to the moving contact and the static contact are in the same space, when this magnetic latching relay is applied to large-current on-off control, the large-current conduction between the moving contact and the static contact often causes the surface of the contact to be powdered. These powdered particles will scatter at positions such as the magnet assembly and the coil assembly, which will affect the normal use of the magnet assembly and the coil assembly, thereby affecting the reliability and safety of the use of this magnetic latching relay. In addition, the opening distance between the moving contact and the static contact of the existing magnetic latching relay is still small, making it difficult to apply to on-off control of larger currents. Moreover, the cover shell of the magnetic latching relay is not provided with an exhaust port, resulting in a sealed space inside the cover shell, which is not conducive to heat dissipation and arc extinguishing and affects the service life. Therefore, it is necessary to improve the existing magnetic latching relay. Summary of the Invention
[0003] To overcome the above deficiencies, the purpose of the present utility model is to provide a large-opening magnetic latching relay to the field, so as to solve the technical problems that the opening distance between the moving contact and the static contact of the existing similar magnetic latching relays is relatively small, making it difficult to be applicable to the on-off control of large currents, the cover of the magnetic latching relay is not provided with an exhaust port, which is not conducive to heat dissipation and arc extinguishing, and due to the non-isolation of the positions of the magnetic steel assembly, the coil assembly and the contacts, the pulverized particles of the contacts are easily introduced into the magnetic steel assembly and the coil assembly and other positions, affecting the working reliability and safety of the magnetic latching relay. Its purpose is achieved through the following technical solutions.
[0004] A large-opening magnetic latching relay, the magnetic latching relay includes a cover, an electromagnetic coil assembly fixed in the cover, a magnetic steel assembly driven by the electromagnetic coil assembly to swing, the magnetic steel assembly is integrally provided with a swing rod, static pieces and lead-out pieces are fixedly arranged on both sides of the cover, the inner ends of the static pieces and the lead-out pieces both extend into the cover, and a static contact is fixedly arranged at the inner end of the static piece; the structural key point is that the swing rod of the magnetic steel assembly is fixedly connected to a moving reed that swings synchronously, the end of the moving reed is fixedly connected to a moving contact and a current-carrying sheet, and the current-carrying sheet is conductively connected to the inner end of the lead-out piece through a flexible wire; when the moving contact swings to one side with the magnetic steel assembly and reaches the position, it abuts against and conducts with the static contact, and the moving reed forms a pressing and holding force F between the moving contact and the static contact under the magnetic holding action of the magnetic steel assembly 1 , a limit support for forming a limit is fixedly arranged in the cover when the moving contact swings to the other side with the magnetic steel assembly, and when the moving contact abuts against the limit support, the moving reed forms a pressing and holding force F between the moving contact and the limit support under the magnetic holding action of the magnetic steel assembly 2 , the pressing and holding force F 1 is the same as the pressing and holding force F 2 . Through the above structure, the magnetic steel assembly swing is directly used to drive the connection between the moving contact and the static contact, so the structure is relatively simplified. In the space of the cover that realizes the miniaturization of the magnetic latching relay, a large-opening stroke between the moving contact and the static contact is realized, which is applicable to the on-off control of larger currents.
[0005] The housing is provided with upper and lower regions. The moving reed, moving contact, static contact, static piece and lead-out piece are arranged in the upper region, and the magnet assembly and electromagnetic coil assembly are arranged in the lower region. A channel adapted to the swinging stroke of the swing rod of the magnet assembly is provided between the upper region and the lower region. Slots are provided on both sides of the channel, and relatively sliding isolation baffles are arranged in the slots on both sides. The isolation baffle is provided with a through hole adapted to pass through the swing rod of the magnet assembly. When the isolation baffle swings with the swing rod, it forms a sliding fit with the chute on both sides of the channel, and the isolation baffle closes the channel, that is, the upper region and the lower region are separated by the isolation baffle. Through this structure, the conducting parts of the moving contact and the static contact are effectively separated from the magnet assembly and the electromagnetic coil assembly, so as to prevent the pulverized particles at the conducting place from entering the magnet assembly and the coil assembly during large-current conduction, and ensure the practical reliability and safety of the magnetic latching relay.
[0006] An arc extinguishing cover for breaking and extinguishing the arc between the moving contact and the static contact is fixedly arranged on one side of the housing within the swinging stroke of the moving contact. The arc extinguishing cover is internally hollowed out to form a cylindrical cavity, and the moving contact of the moving reed is located within the cavity. Through this structure, reliable arc extinguishing is achieved when the moving contact and the static contact are opened and closed with a large opening distance.
[0007] Part of the arc extinguishing pieces of the arc extinguishing cover form a cooperative positioning with the limit support. Through this structure, the spatial layout within the housing is more compact, which is beneficial to miniaturization.
[0008] An exhaust port is provided at the top of the housing corresponding to the position of the arc extinguishing cover, and a dust-proof net is arranged in the exhaust port. Through this structure, it plays the roles of dust prevention, beneficial arc extinguishing and heat dissipation. Dust prevention means preventing external impurities or dust from entering the housing. Beneficial arc extinguishing means balancing the pressure difference inside and outside the housing when the moving contact and the static contact are conducting or the instantaneous arc heats the air. Heat dissipation means discharging heat in time when the temperature of the moving contact and the static contact conducting rises. The above improves the use reliability and service life of this magnetic latching relay.
[0009] The position of the static contact at the inner end of the static piece is tilted upwards obliquely, and when the contact surface of the moving contact swings in place, it is in plane contact and conduction with the contact surface of the static contact. Through this structure, the reliability of the conduction between the moving contact and the static contact is ensured, and the problem of virtual connection is prevented.
[0010] Permanent magnets or electrolytic iron are fixedly arranged on the shell surfaces on the front and back sides of the housing opposite to the conducting positions of the moving contact and the static contact. Through this structure, magnetic arc extinguishing between the moving contact and the static contact is realized.
[0011] The overall structure of the utility model is small in volume. A large opening distance is formed between the moving contact and the static contact, which is applicable to the on-off of large current, not easy to generate continuous arc, and the pulverized particles generated by the on-off of large current are not easy to affect the magnetic steel component and the coil component. It works reliably and safely, has a long service life, is suitable for use as a magnetic latching relay, or for the structural improvement of similar products. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] Figure 1 is a schematic diagram of the internal structure of the utility model.
[0013] Figure 2 is Figure 1 a schematic diagram of the structure with the arc extinguishing cover omitted.
[0014] Figure 3 is a schematic perspective view of the utility model.
[0015] The numbers and names in the figure are: 1. housing, 101. slot, 102. limit support, 103. exhaust port, 2. electromagnetic coil assembly, 3. magnetic steel assembly, 301. swing rod, 4. isolation baffle, 5. moving reed, 501. moving contact, 6. current guiding piece, 7. static piece, 701. static contact, 8. flexible wire, 9. lead-out piece, 10. arc extinguishing cover, 11. dust-proof net, 12. permanent magnet. EMBODIMENT
[0016] Now, with reference to the accompanying drawings, the present utility model will be further described.
[0017] As Figures 1 - 3 shown, the large-opening-distance magnetic latching relay includes a housing 1, an electromagnetic coil assembly 2 fixed inside the housing, and a magnetic steel assembly 3 that swings under the drive of the electromagnetic coil assembly. The electromagnetic coil assembly includes a coil bracket, an iron core, a coil, and yokes. That is, the iron core is arranged in the middle of the coil bracket, and the coil is wound around the outside. Bent yokes are provided at both ends of the coil bracket. The magnetic steel assembly includes a housing and a permanent magnet placed inside the housing. Double-headed armatures that are magnetically conductive with the permanent magnet are provided on both sides of the housing. The magnetic steel assembly forms a magnetic attraction fit with the yokes at both ends of the electromagnetic coil assembly through the double-headed armatures on both sides, driving the magnetic steel assembly to swing. A swing rod 301 is integrally provided on one side of the housing of the magnetic steel assembly. Static pieces 7 and lead-out pieces 9 are fixedly provided on both sides of the housing. The inner ends of the static pieces and the lead-out pieces extend into the housing. Among them, a static contact 701 is fixedly provided at the inner end of the static piece. The swing rod of the magnetic steel assembly is fixedly connected to a moving reed 5 that swings synchronously. The end of the moving reed is fixedly connected to a moving contact 501 and a current guiding piece 6. The current guiding piece is conductively connected to the inner end of the lead-out piece through a flexible wire 8. When the moving contact swings to one side with the magnetic steel assembly and reaches the position, it abuts against the static contact for conductive connection, and the moving reed forms a pressing holding force F between the moving contact and the static contact under the magnetic holding action of the magnetic steel assembly. 1, a limiting support 102 for forming a limit is fixedly arranged inside the housing when the moving contact swings towards the other side along with the magnet assembly, and when the moving contact abuts against the limiting support in a limited manner, a pressing and holding force F is formed between the moving contact and the limiting support by the magnetic holding action of the magnet assembly on the moving spring piece 2 , the pressing and holding force F 1 is the same size as the pressing and holding force F 2 . The pressing and holding force F is formed by the deformation of the moving spring piece 1 and F 2 . On the one hand, it makes the moving contact and the static contact abut tightly and reliably. On the other hand, it forms an initial force for relative driving for the swing of the magnet assembly, which can effectively reduce the kinetic energy requirement for the swing of the magnet assembly, thereby reducing the power of the electromagnetic coil assembly and reducing power consumption.
[0018] There are upper and lower two regions inside the above-mentioned housing 1. The moving spring piece 5, the moving contact 501, the static contact 701, the static piece 7 and the lead-out piece 9 are arranged in the upper region, and the magnet assembly 3 and the electromagnetic coil assembly 2 are arranged in the lower region. There is a channel adapting to the swing stroke of the swing rod of the magnet assembly between the upper region and the lower region. Slots 101 are arranged on both sides inside the channel, and a relatively sliding isolation baffle 4 is inserted into the slots on both sides. The isolation baffle is provided with a through hole adapting to pass through the swing rod of the magnet assembly. When the isolation baffle swings along with the swing rod, it forms a sliding fit relative to the chute on both sides of the channel, and the isolation baffle forms a closure for the channel, that is, a separation is formed between the upper region and the lower region through the isolation baffle, effectively preventing the pulverized particles during the connection of the moving contact and the static contact from entering the magnet assembly and the electromagnetic coil assembly.
[0019] An arc extinguishing cover 10 for breaking and extinguishing the arc between the moving contact and the static contact 701 is fixedly arranged on one side of the swing stroke of the moving contact 501 inside the above-mentioned housing 1. The arc extinguishing cover is internally hollowed out to form a columnar concave cavity, and the moving contact of the moving spring piece 5 is located inside the concave cavity. Part of the arc extinguishing piece of the arc extinguishing cover forms a fitting and positioning with the above-mentioned limiting support 102 inside the housing, making the internal structure of the housing more compact and beneficial to miniaturization.
[0020] Further, an exhaust port 103 is arranged at the top of the above-mentioned housing 1 corresponding to the position of the arc extinguishing cover. A slot is formed inside the exhaust port, and a dust-proof net 11 is inserted, which plays the role of dust prevention, is beneficial to arc extinguishing, has a heat dissipation effect at the same time, and improves the use safety and service life.
[0021] Further, the position of the static contact 701 at the inner end of the above-mentioned static piece 7 is tilted upwards obliquely, that is, when the contact surface of the moving contact 501 swings in place, it abuts against the contact surface of the static contact in a plane for conduction connection, making the conduction connection between the moving contact and the static contact reliable and preventing virtual connection.
[0022] Furthermore, permanent magnets 12 or electrolytic iron, which are opposite to the conducting positions of the moving contact 501 and the static contact 701, are fixedly arranged on the shell surfaces on the front and rear sides of the above-mentioned housing 1, and the permanent magnets or electrolytic iron are in a sheet structure to achieve magnetic arc extinguishing for the moving contact and the static contact.
[0023] The above content is intended to illustrate the technical means of the present invention and is not intended to limit the technical scope of the present invention. Obvious improvements or replacements made by those skilled in the art in combination with the existing well-known common sense also fall within the protection scope of the claims of the present invention.
Claims
1. A large-opening magnetic latching relay, the magnetic latching relay comprising a housing (1), an electromagnetic coil assembly (2) fixed in the housing, a magnetic steel assembly (3) driven by the electromagnetic coil assembly to swing, a swing rod (301) integrated with the magnetic steel assembly, static plates (7) and lead plates (9) fixed on both sides of the housing, the inner ends of the static plates and the lead plates both extending into the housing, wherein a static contact (701) is fixed on the inner end of the static plates; characterized in that The swing rod (301) of the magnetic steel assembly (3) is fixedly connected to a synchronously swinging movable spring sheet (5), the end of the movable spring sheet is fixedly connected to a movable contact (501) and a guide sheet (6), and the guide sheet is connected to the inner end of the lead-out sheet (9) via a flexible wire (8); when the movable contact is swung to one side and in position, it is abutted against the static contact (701), and the movable spring sheet forms a tight holding force F1 between the movable contact and the static contact under the magnetic holding action of the magnetic steel assembly; a limit support (102) is fixedly provided in the housing to form a limit when the movable contact is swung to the other side with the magnetic steel assembly, and when the movable contact and the limit support are limited and abutted, the movable spring sheet forms a tight holding force F2 between the movable contact and the limit support under the magnetic holding action of the magnetic steel assembly, and the tight holding force F1 is equal to the tight holding force F2.
2. The large-open-distance magnetic latching relay according to claim 1, characterized in that The housing (1) is provided with an upper and a lower area. The movable spring sheet (5), the movable contact (501), the stationary contact (701), the stationary sheet (7) and the lead-out sheet (9) are arranged in the upper area. The magnetic steel assembly (3) and the electromagnetic coil assembly (2) are arranged in the lower area. A channel adapted to the swing stroke of the swing rod (301) of the magnetic steel assembly is provided between the upper area and the lower area. Slots (101) are provided on both sides of the channel. Isolation baffles (4) that slide relatively are provided in the slots on both sides. The isolation baffles are provided with through holes adapted to pass through the swing rod of the magnetic steel assembly. When the isolation baffles swing with the swing rod, they form a sliding fit with the slide grooves on both sides of the channel. The isolation baffles close the channel. That is, the upper area and the lower area are separated by the isolation baffles.
3. The large-open-distance magnetic latching relay according to claim 1, characterized in that An arc extinguishing cover (10) for interrupting and extinguishing arcs between the moving contact and the stationary contact (701) is fixedly provided in the housing (1) on one side of the swing stroke of the moving contact (501), and the arc extinguishing cover is a hollow cylindrical cavity formed inside, and the moving contact of the moving spring sheet (5) is located in the cavity.
4. The large-open-distance magnetic latching relay according to claim 3, characterized in that Part of the arc-extinguishing pieces of the arc-extinguishing cover (10) are matched and positioned with the limiting support (102).
5. The large-open-distance magnetic latching relay according to claim 3, characterized in that An exhaust port (103) is provided at a position on the top of the housing (1) corresponding to the arc extinguishing cover, and a dustproof net (11) is provided in the exhaust port.
6. The large-open-distance magnetic latching relay according to claim 1, characterized in that The position of the static contact (701) at the inner end of the static sheet (7) is tilted obliquely, so that when the contact surface of the adapted moving contact (501) swings into position, it contacts the contact surface of the static contact in a planar manner.
7. The large-open-distance magnetic latching relay according to claim 1, characterized in that Permanent magnets (12) or electrical pure iron are fixedly provided on the shell surfaces at the front and rear sides of the cover shell (1) and are opposite to the conducting positions of the moving contact (501) and the stationary contact (701).