Arc extinguishing structure of magnetic latching relay

Abstract

An arc extinguishing structure of a magnetic latching relay comprises a housing, a magnetic steel assembly and an electric connection assembly. The shell comprises a base and a cover plate. An arc extinguishing layer is arranged on the inner side of the base, and the magnetic steel assembly comprises a permanent magnet and a swing head. The permanent magnet and the swing head are respectively provided with an arc extinguishing layer, and the electric connection assembly comprises a sliding frame, a movable spring assembly and a static reed. The movable spring assembly comprises a magnetized iron sheet, a contact base, a contact, an elastic piece and an elastic piece. The arc extinguishing layers are arranged on the inner side wall of the base and the permanent magnet, so that electric arcs sputtered to the arc extinguishing layers are eliminated. The movable contact is arranged in the magnetized iron sheet, the flow deflectors are arranged on the two sides of the magnetized iron sheet to guide electric arcs to be sprayed to the arc extinguishing layers on the two sides, the arc extinguishing effect is good, additional parts are not needed, and low-cost production of enterprises is facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of relays, in particular to an arc extinguishing structure of a magnetic latching relay. Background Art

[0002] A relay is a circuit switch with a protective nature, which is used to establish an interactive relationship between a control system and a controlled system. It is usually applied to an automatic control circuit and plays roles such as automatic regulation, safety protection, and circuit conversion.

[0003] During the use of a relay, electric arcs are generated when its moving contact and static contact are opened and closed, especially in the working condition of large current. An electric arc is a common gas discharge phenomenon, which is an instantaneous spark generated when current passes through some insulating media (such as air). The electric arc will cause loss to the contacts of the relay, greatly shortening the service life of the relay, increasing the use cost. At the same time, the electric arc will also cause production accidents such as fires. Therefore, extinguishing the electric arc is one of the basic considerations in the development of relays.

[0004] Chinese Patent CN108550505A discloses a high-power DC relay, which includes a housing, a transmission component, a static reed and a moving reed arranged in the housing. A static contact is arranged on the static reed, and a moving contact is arranged on the moving reed. The output end of the transmission component is connected to the moving reed. The high-power DC relay also includes a set of flexible arc-proof components. The flexible arc-proof components include a partition board and a spring. One end of the spring is connected to the housing, and the other end of the spring is connected to the partition board. The partition board is in contact connection with the moving reed. The flexible arc-proof components are arranged between the static contact and the moving contact, and move outward to both ends of the moving reed under the action of the transmission component through the moving reed. When the moving contact and the static contact are separated, the flexible arc-proof components move between the moving contact and the static contact to achieve arc extinguishing and arc isolation. However, the flexible arc-proof components arranged in the above relay have a complex structure, which is not conducive to the low-cost production of enterprises. Summary of the Utility Model

[0005] In view of this, the utility model provides an arc extinguishing structure of a magnetic latching relay to solve the above technical problems.

[0006] An arc extinguishing structure of a magnetic latching relay, which includes a housing, a magnet assembly disposed in the housing, and an electrical connection assembly disposed in the housing. The housing includes a base and a cover plate covering the base. The base includes a coil mounting portion disposed on one side of the base, a magnet mounting portion disposed on one side of the coil mounting portion, and an electrical connection mounting portion disposed on the other side of the base. The magnet mounting portion includes two first insertion slots respectively disposed on two inner side walls of the base, a second insertion slot, and an insertion bottom slot disposed between the first insertion slot and the second insertion slot. A first arc extinguishing layer is further disposed on the end face of the inner side of the base away from the coil mounting portion, and a second arc extinguishing layer is disposed on the end face of the second insertion slot facing the electrical connection assembly. The magnet assembly includes a permanent magnet rotatably disposed in the insertion bottom slot, a swing head disposed on the end face of the permanent magnet facing the electrical connection assembly, and an assembly frame for assembling the permanent magnet and the swing head to the housing. Two ends of the assembly frame are respectively inserted into the first insertion slot and the second insertion slot. The electrical connection assembly includes a sliding frame, two moving contact assemblies spaced apart in the direction of the electrical connection mounting portion on the sliding frame, and two static contact blades inserted into the electrical connection mounting portion. Each moving contact assembly includes a strip-shaped magnetized iron sheet, a contact base fixedly disposed on the magnetized iron sheet, two moving contacts respectively disposed at both ends of the contact base, a spring piece disposed on the side of the magnetized iron sheet facing away from the contact base, and an elastic member with both ends respectively abutted between the sliding frame and the spring piece. Two pairs of flow guiding sheets are spaced apart on both sides of the length of the magnetized iron sheet, and both ends of the spring piece are bent to one side, and the bent portions are in abutting contact with both ends of the magnetized iron sheet.

[0007] Further, the coil mounting portion is used for mounting an electromagnetic coil.

[0008] Further, the electrical connection mounting portion includes two static contact blade slots spaced apart on the side wall of the base, an iron block accommodating groove disposed between the two static contact blade slots, and a sliding groove vertically corresponding to the iron block accommodating groove.

[0009] Further, the free end of the swing head is connected to the electrical connection assembly.

[0010] Further, the first arc extinguishing layer and the second arc extinguishing layer are respectively disposed on the perpendicular bisectors of a pair of adjacent moving contacts and static contact blades.

[0011] Further, the included angle between the flow guiding sheet and the magnetized iron sheet is 90 degrees.

[0012] Further, the width of the flow guide piece is smaller than the total thickness of the contact base and the moving contact.

[0013] Further, two stop pieces are respectively arranged on both sides of the elastic piece in the width direction.

[0014] Further, two static contacts are arranged on each static reed piece at intervals.

[0015] Further, the positions of the static contacts on the static reed piece are arranged corresponding to the moving contact.

[0016] Compared with the prior art, an arc extinguishing structure of a magnetic latching relay provided by the utility model arranges the moving contact in the magnetized iron sheet, and arranges the flow guide pieces on both sides of the magnetized iron sheet. When energized, a Lorentz force is generated between the flow guide piece, the moving contact, and the static contact, so as to guide the arc generated between the moving contact and the static contact to both sides. At the same time, a first arc extinguishing layer and a second arc extinguishing layer are arranged on the inner side wall of the base, and the first arc extinguishing layer and the second arc extinguishing layer are respectively arranged on the vertical bisectors of the moving contact and the static reed piece on both sides. When the arc splashes onto the first arc extinguishing layer and the second arc extinguishing layer, it can be absorbed in time, and the arc extinguishing effect is good. There is no need to additionally increase components, which is beneficial to the low-cost production of enterprises. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic structural diagram of an arc extinguishing structure of a magnetic latching relay provided by the utility model.

[0018] Figure 2 is Figure 1 a schematic structural diagram of the base of the arc extinguishing structure of the magnetic latching relay.

[0019] Figure 3 is Figure 1 a schematic structural diagram of the moving reed assembly of the arc extinguishing structure of the magnetic latching relay.

[0020] Figure 4 is Figure 1 a schematic structural diagram of the moving reed piece of the arc extinguishing structure of the magnetic latching relay. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] The following further details the specific embodiments of the present utility model. It should be understood that the description of the embodiments of the present utility model herein does not limit the protection scope of the present utility model.

[0022] As Figures 1 to 4As shown, it is a schematic structural diagram of an arc extinguishing structure of a magnetic latching relay provided by the present utility model. The arc extinguishing structure of the magnetic latching relay includes a housing 10, a magnet assembly 20 disposed in the housing 10, and an electrical connection assembly 30 disposed in the housing 10. It can be envisioned that the arc extinguishing structure of the magnetic latching relay further includes some other functional structures, such as connection terminals, etc., which are well-known technologies to those skilled in the art and will not be elaborated herein.

[0023] The housing 10 includes a base 11 and a cover plate 12 covering the base 11. The base 11 includes a magnet mounting portion 14, a coil mounting portion 13 disposed on one side of the magnet mounting portion 14, and an electrical connection mounting portion 15 disposed on the other side of the magnet mounting portion 14. A first arc extinguishing layer 17 is further disposed on the end face of the inner side of the base 11 away from the coil mounting portion 13.

[0024] An electromagnetic coil 16 is installed in the coil mounting portion 13. The electromagnetic coil 16 is a prior art and will not be elaborated herein. The magnet mounting portion 14 is used to mount the magnet assembly 20. The magnet mounting portion 14 includes two first insertion slots 141 respectively disposed on the two inner side walls of the base 11, a second insertion slot 142, and an insertion bottom slot 143 disposed between the first insertion slot 141 and the second insertion slot 142. A second arc extinguishing layer 18 is disposed on the end face of the second insertion slot 142 facing the electrical connection assembly 30. The first arc extinguishing layer 17 and the second arc extinguishing layer 18 can be made of arc extinguishing materials such as silicone rubber to play a role in absorbing arcs.

[0025] The electrical connection mounting portion 15 is used to mount the electrical connection assembly 30. The electrical connection mounting portion 15 includes two static reed slots 151 spaced apart on the side wall of the base 11, an iron block accommodating groove 152 disposed between the two static reed slots 151, and a sliding groove 153 vertically corresponding to the iron block accommodating groove 152. The static reed slots 151, the iron block accommodating groove 152, and the sliding groove 153 will be described below in conjunction with the electrical connection assembly 30. After the electromagnetic coil 16 is energized, positive and negative magnetic fields are generated at its own two ends, which attract or repel the positive and negative magnetic fields of the magnet assembly 20 itself, thereby driving the magnet assembly 20 to rotate, and further achieving the purpose of making the relay perform on and off.

[0026] The magnet assembly 20 includes a permanent magnet 21 rotatably disposed in the insertion bottom groove 143, a swing head 22 disposed on the end face of the permanent magnet 21 facing the electrical connection assembly 30, and an assembly frame 23 for assembling the permanent magnet 21 and the swing head 22. The free end of the swing head 22 is connected to the electrical connection assembly 30. By changing the current direction of the electromagnetic coil 16 to change its positive and negative poles, the permanent magnet 21 is driven to swing reciprocally. When the permanent magnet 21 swings, it drives the swing head 22 to swing, so that the electrical connection assembly 30 connected to the swing head 22 makes a reciprocating motion of opening and closing.

[0027] Both ends of the assembly frame 23 are respectively inserted into the first insertion groove 141 and the second insertion groove 142. The end face of the permanent magnet 21 away from the insertion bottom groove 143 is rotatably connected to the assembly frame 23, so that the permanent magnet 21 can maintain balance when swinging.

[0028] The electrical connection assembly 30 includes a sliding frame 31 slidably disposed on the sliding groove 153, two moving contact assemblies 32 spaced apart on the sliding frame 31 facing the static contact piece slot 151, and two static contact pieces 33 inserted into the static contact piece slot 151.

[0029] Each moving contact assembly 32 includes a strip-shaped magnetized iron sheet 321, two contact base seats 322 fixedly disposed at both ends of the magnetized iron sheet 321, two moving contacts 323 respectively disposed on the contact base seats 322, a spring piece 324 disposed on the end face of the magnetized iron sheet 321 facing away from the contact base seats 322, and an elastic member 325 with both ends respectively abutted between the sliding frame 31 and the spring piece 324.

[0030] Two pairs of flow guide sheets 326 are spaced apart on both sides of the magnetized iron sheet 321 in the width direction. The included angle between the flow guide sheet 326 and the magnetized iron sheet 321 is 90 degrees. The flow guide sheet 326 and the magnetized iron sheet 321 are integrally formed by stamping. The width of the flow guide sheet 326 is less than the total thickness of the contact base seat 322 and the moving contact 323 to prevent the flow guide sheet 326 from being too high and affecting the contact of the moving contact 323.

[0031] The contact base 322 is used to fix the moving contact 323. When the two moving contacts 323 are respectively in contact with or disconnected from the static reed 33 to conduct or cut off the current, an arc will be generated between the contact points of the moving contact 323 and the static reed 33. It can be understood that at this time, there will also be current passing through the magnetized iron sheet 321, so that the magnetized iron sheet 321 and the current guiding sheet 326 will generate magnetism. After the current guiding sheet 326 arranged on the magnetized iron sheet 321 is magnetized, a Lorentz magnetic force will be generated between the current guiding sheet 326, the moving contact 323, and the static reed 33. According to the right-hand rule, this Lorentz magnetic force will force the arc to spray in a direction perpendicular to the arrangement direction of the moving contact 323 and the static reed 33, and the sprayed arc will hit the first arc extinguishing layer 17 and the second arc extinguishing layer 18, thereby achieving the purpose of arc extinguishing. Therefore, the first arc extinguishing layer 17 is arranged on the perpendicular bisector of a pair of the moving contacts 323 and the static reed 33 and is arranged inside the housing 10.

[0032] For the arc generated by the other pair of the moving contacts 323 and the static reed 33, the second arc extinguishing layer 18 is also arranged on the perpendicular bisector of this pair of the moving contacts 323 and the static reed 33 to achieve the purpose of eliminating the arc.

[0033] The magnetized iron sheet 321 and the current guiding sheet 326 can also help the contact base 322 and the moving contact 323 dissipate heat, prolonging the service life of the entire relay.

[0034] Both ends of the elastic sheet 324 are bent towards one side to form a U shape with both ends expanding outwards, and the bent parts are in abutting contact with both ends of the magnetized iron sheet 321. Two stop pieces 327 are respectively arranged on both sides of the elastic sheet 324 in the width direction. The elastic sheet 324 is embedded in the sliding frame 31 through the two pairs of stop pieces 327.

[0035] The elastic member 325 presses the elastic sheet 324 and the magnetized iron sheet 321 tightly, so that when the moving contact 323 abuts against the static reed 33, it is pressed tightly and the contact is closer.

[0036] Two static contacts 331 are also arranged on each static reed 33 at intervals. The positions of the static contacts 331 arranged on the static reed 33 are arranged corresponding to the moving contacts 323, so that when the sliding frame 31 moves, the static contacts 331 and the moving contacts 323 can contact each other to achieve the function of a switch.

[0037] During use, the electromagnetic coil 16 is energized to drive the permanent magnet 21 to swing. The swinging of the permanent magnet 21 drives the swinging of the swing head 22, causing the sliding frame 31 to slide in the direction of the static contact piece 33, so that the moving contact 323 abuts against the static contact 331, and the circuit is connected at this time. At the moment when the moving contact 323 contacts the static contact 331, an electric arc is generated between the moving contact 323 and the static contact 331. Under the action of the Lorentz force, the electric arc is sprayed towards the first arc extinguishing layer 17 and the second arc extinguishing layer 18 on both sides, and then the first arc extinguishing layer 17 and the second arc extinguishing layer 18 eliminate the electric arc.

[0038] Compared with the prior art, for the arc extinguishing structure of a magnetic latching relay provided by the present utility model, the moving contact 323 is arranged in the magnetized iron sheet 321, and the current-carrying sheets 326 are arranged on both sides of the magnetized iron sheet 321. When energized, a Lorentz force is generated between the current-carrying sheets 326, the moving contact 323, and the static contact 331, so as to guide the electric arc generated between the moving contact 323 and the static contact 331 to both sides. At the same time, the first arc extinguishing layer 17 and the second arc extinguishing layer 18 are arranged on the inner side wall of the base 11, and the first arc extinguishing layer 17 and the second arc extinguishing layer 18 are respectively arranged on the perpendicular bisectors of the moving contact 323 and the static contact piece 33 on both sides. When the electric arc splashes onto the first arc extinguishing layer 17 and the second arc extinguishing layer 18, it can be absorbed in time, and the arc extinguishing effect is good. There is no need to additionally increase components, which is beneficial to the low-cost production of enterprises.

[0039] The above is only the preferred embodiment of the present utility model, and is not used to limit the protection scope of the present utility model. Any modification, equivalent replacement or improvement within the spirit of the present utility model is covered by the claims of the present utility model.

Claims

1. An arc extinguishing structure of a magnetic latching relay, characterized in that: The arc extinguishing structure of the magnetic latching relay includes a housing, a magnet assembly disposed in the housing, and an electrical connection assembly disposed in the housing. The housing includes a base and a cover plate covering the base. The base includes a coil mounting portion disposed on one side of the base, a magnet mounting portion disposed on one side of the coil mounting portion, and an electrical connection mounting portion disposed on the other side of the base. The magnet mounting portion includes two first insertion slots respectively disposed on two inner side walls of the base, a second insertion slot, and an insertion bottom slot disposed between the first insertion slot and the second insertion slot. A first arc extinguishing layer is further disposed on the end face of the inner side of the base away from the coil mounting portion, and a second arc extinguishing layer is disposed on the end face of the second insertion slot facing the electrical connection assembly. The magnet assembly includes a permanent magnet rotatably disposed in the insertion bottom slot, a swing head disposed on the end face of the permanent magnet facing the electrical connection assembly, and an assembly frame for assembling the permanent magnet and the swing head to the housing. Two ends of the assembly frame are respectively inserted into the first insertion slot and the second insertion slot. The electrical connection assembly includes a sliding frame, two moving contact assemblies spaced apart in the direction of the electrical connection mounting portion on the sliding frame, and two static contact springs inserted into the electrical connection mounting portion. Each moving contact assembly includes a strip-shaped magnetized iron sheet, a contact base fixedly disposed on the magnetized iron sheet, two moving contacts respectively disposed at two ends of the contact base, a spring sheet disposed on the side of the magnetized iron sheet opposite to the contact base, and an elastic member with two ends respectively abutted between the sliding frame and the spring sheet. Two pairs of flow guiding sheets are spaced apart on both side edges of the length of the magnetized iron sheet. Two ends of the spring sheet are bent towards one side, and the bent portions are in abutting contact with two ends of the magnetized iron sheet.

2. The arc extinguishing structure of the magnetic latching relay according to claim 1, wherein: The coil mounting portion is used for mounting an electromagnetic coil.

3. The arc extinguishing structure of the magnetic latching relay according to claim 1, characterized in that: The electrical connection mounting portion includes two static contact spring slots spaced apart on the side wall of the base, an iron block accommodating groove disposed between the two static contact spring slots, and a sliding groove vertically corresponding to the iron block accommodating groove.

4. The arc extinguishing structure of the magnetic latching relay according to claim 1, characterized in that: The free end of the swing head is inserted into the electrical connection assembly.

5. The arc extinguishing structure of the magnetic latching relay according to claim 1, characterized in that: The first arc extinguishing layer and the second arc extinguishing layer are respectively disposed on the perpendicular bisectors of a pair of adjacent moving contacts and static contact springs.

6. The arc extinguishing structure of the magnetic latching relay according to claim 1, wherein: The included angle between the flow guiding sheet and the magnetized iron sheet is 90 degrees.

7. The arc extinguishing structure of the magnetic latching relay according to claim 1, characterized in that: The width of the flow guiding sheet is smaller than the total thickness of the contact base and the moving contact.

8. The arc extinguishing structure of the magnetic latching relay according to claim 1, characterized in that: Two stoppers are respectively disposed on both sides of the spring sheet in the width direction.

9. The arc extinguishing structure of the magnetic latching relay according to claim 1, characterized in that: Two static contacts are spaced apart on each static contact spring.

10. The arc extinguishing structure of the magnetic latching relay according to claim 9, characterized in that: The positions of the static contacts on the static contact spring are correspondingly arranged relative to the moving contacts.

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