CN216487880U - Electromagnetic relay - Google Patents
Electromagnetic relay Download PDFInfo
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- CN216487880U CN216487880U CN202122735154.3U CN202122735154U CN216487880U CN 216487880 U CN216487880 U CN 216487880U CN 202122735154 U CN202122735154 U CN 202122735154U CN 216487880 U CN216487880 U CN 216487880U
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Abstract
An electromagnetic relay belongs to the field of relays and aims to solve the problems of water resistance and dust accumulation and comprises a coil, a magnet column, a pushing device, a pull-back device and a waterproof capsule, wherein the coil is sealed in a coil shell formed by an injection molding mode, the magnet column is surrounded in the center by the coil and is fixed by the coil, the magnet column is positioned below the pull-back device, the coil drives the magnet column to move downwards when electrified and applies upward force to the magnet column to enable the magnet column to move upwards to reset when the coil is powered off, the pushing device is connected to the lower portion of the magnet column, penetrates through an opening in a bottom plate of the coil shell and is opposite to a movable contact of the waterproof capsule positioned outside the coil shell up and down, and the effects of water resistance, dust resistance, electric leakage resistance and explosion resistance are achieved.
Description
Technical Field
The utility model belongs to the field of relays and relates to a waterproof electromagnetic relay.
Background
A relay is an electrically controlled device that causes a controlled amount to undergo a predetermined step change in an electrical output circuit. It is an automatic switch which uses small current to control large current operation. The circuit plays the roles of automatic regulation, safety protection, circuit conversion and the like. At present, the relay has poor waterproof performance, particularly, the relay contact is easy to accumulate dust besides poor waterproof performance, so that micro-current is caused, even the relay contact is conducted mistakenly and the like. Further, the relay operating mechanism is not compact or complicated in its interior.
SUMMERY OF THE UTILITY MODEL
In order to solve the problems of water resistance and dust accumulation and further solve the problems of electric leakage and explosion, the utility model provides the following technical scheme: an electromagnetic relay includes
A coil sealed therein by an injection molded coil housing,
a pull-back device, the pull-back device is fixed by a coil, a magnet column is positioned below the pull-back device,
a magnet post disposed in the central hole of the coil, the magnet post being driven to move downward when the coil is charged, and the magnet post being reset upward by the upward force applied to the magnet post by the pull-back device when the coil is de-energized,
the lower part of the magnet column is connected with the pushing device which penetrates through the opening on the bottom plate of the coil shell and is vertically opposite to the movable contact piece of the waterproof capsule positioned outside the coil shell,
waterproof capsule, waterproof capsule include the capsule base and fix the waterproof gum cover on the capsule base, movable contact and static contact setting are in the inside of waterproof gum cover, and movable contact and static contact are fixed on the capsule base, and the movable contact is located the static contact top, make the magnet post drive thrust unit downwards push waterproof capsule and make the movable contact squint downwards and switch on with the static contact, make thrust unit upwards keep away from waterproof capsule and make movable contact and static contact separation when the magnet post goes upward.
As a supplement to the technical solution, the capsule base is formed by injection molding.
As a supplement to the technical solution, the coil, the magnet post and the pushing device are located inside the coil housing, the coil housing is adapted to the shape of the coil to fix the coil inside the coil housing, and the outer periphery of the magnet post forms the housing by injection molding.
As the supplement of the technical scheme, the pushing device comprises a connecting column, a panel and a pushing column, wherein the lower part of the magnet column is connected with the connecting column, the connecting column penetrates through a hole in the coil shell and is connected with the panel, a plurality of pushing columns are distributed on the lower surface of the panel, and the pushing columns are opposite to a movable contact piece of the waterproof capsule and are in contact with or separated from the waterproof capsule.
As a supplement to the technical solution, the bottom plate of the coil housing has an opening through which the connection column passes, and the connection column moves vertically in the opening of the bottom plate.
As a supplement to the technical solution, the pull-back device is an iron column, the iron column applies an upward suction force to the magnet column when the coil is powered off to enable the magnet column to move upward and reset, and the outer periphery of the iron column forms a shell in an injection molding manner.
As a complement to the technical solution, the present invention,
the pull-back device is a tension spring, the upper end of the tension spring is connected to the coil shell positioned above the magnet column, the lower end of the tension spring is connected to the upper end of the magnet column, and the tension spring applies upward elastic restoring force to the magnet column when the coil is powered off so as to enable the magnet column to move upwards for resetting;
as a supplement to the technical scheme, the pull-back device is a pressure spring, the lower end of the pressure spring is connected to a coil shell positioned below the magnet column, the upper end of the pressure spring is connected to the lower end of the magnet column, and the pressure spring applies upward elastic restoring force to the magnet column when the coil is powered off to enable the magnet column to move upwards for resetting;
as a supplement to the technical scheme, the pull-back device is a tension spring, the upper end of the tension spring is connected to the coil shell above the magnet column, the lower end of the tension spring is connected to the upper end of the magnet column, and the tension spring applies upward elastic restoring force to the magnet column when the coil is powered off so as to enable the magnet column to move upwards for resetting; and the lower end of the pressure spring is connected to the coil shell below the magnet column, the upper end of the pressure spring is connected to the lower end of the magnet column, and the pressure spring applies upward elastic restoring force to the magnet column when the coil is powered off so as to enable the magnet column to move upwards for resetting.
As a supplement to the technical solution, an insulating elastic member is provided between the movable contact piece and the stationary contact piece for assisting and correcting deformation and springback of the movable contact piece and the stationary contact piece, contacts are provided on both the movable contact piece and the stationary contact piece, and the movable contact piece and the stationary contact piece are configured to contact each other by means of the respective contacts.
As a supplement to the technical solution, the electromagnetic relay further includes a rectifier bridge, and the rectifier bridge is connected between the ac power supply and the coil to shape the ac power into the dc power supply coil.
As a supplement of the technical proposal, the movable contact piece and the static contact piece are fixed on the capsule base and are led out by being covered by the capsule base, and the leading-out ends are connected with corresponding wiring ends.
Has the advantages that: the relay has the advantages that the waterproof performance of the relay is improved by coating the surfaces of the waterproof capsule and the coil by injection molding, particularly, the contact can be positioned in a completely closed space of the waterproof capsule, the waterproof performance is improved, the defect of dust accumulation is overcome, the phenomena of micro-current and wrong conduction are basically avoided, and the contact is positioned in the waterproof capsule and isolated from the outside, so that the leakage and explosion can be prevented. The waterproof capsule plays roles of water resistance, dust prevention, electricity leakage prevention and explosion prevention in the utility model, and is used for realizing the purpose of ensuring the accurate action of the contact.
According to the utility model, when the magnet column moves downwards, the pushing device is driven to push the waterproof capsule downwards to enable the movable contact piece to deflect downwards and to be in contact with and conducted with the static contact piece, when the magnet column moves upwards, the pushing device is driven to move upwards to be away from the waterproof capsule to enable the movable contact piece to be separated from the static contact piece, the vertical movement and reset control of the magnet column are realized through the on-off control of the coil and the matching of the pull-back device under the double magnetic action of the iron column and the electromagnetic coil or the action of the electromagnetism and the resilience of the tension spring of the electromagnetic coil, so that the contact conduction in the waterproof capsule can be realized through the movement control, and the conduction control structure only has one-way movement, and is high in action guarantee, compact and ingenious in structure and low in cost. The synergy of the characteristic combination of the utility model enables the utility model to realize more comprehensive waterproof effect.
Drawings
Fig. 1 is a schematic diagram of an electromagnetic relay in embodiment 1.
Fig. 2 is a schematic diagram of an electromagnetic relay in embodiment 2.
Figure 3 is a schematic view of a waterproof capsule.
1. The magnetic coil comprises a coil, 2 magnet columns, 3 injection molding materials, 4 coil shells, 5 waterproof capsules, 6 connecting columns, 7 panels, 8 pushing columns, 9 iron columns, 10 tension springs, 11 rectifier bridges, 12 movable contacts, 13 static contacts and 14 pressure springs.
Detailed Description
Example 1: as shown in fig. 1, in an electromagnetic relay, a rectifier bridge 11 is connected between an ac power supply and a coil 1 of the electromagnetic relay to rectify ac power into dc power to supply to the coil 1, and since the direction of current is fixed, the direction of a magnetic field generated by energizing the coil is determined. The electromagnetic relay comprises a coil 1, wherein the surface of the coil 1 is coated by an injection molding material 3, the injection molding material 3 forms a coil shell 4, and the coil shell 4 is matched with the shape of the coil 1 to fix the coil 1 inside the coil shell 4. The magnet post 2 is a permanent magnet, and is formed as a housing by injection molding on the outer periphery of the magnet post 2 in the central hole of the coil 1. The iron column 9 is fixed by the coil 1, and the periphery of the iron column 9 forms a shell by injection molding. Magnet post 2 is located the below of iron prop 9, and 2 lower parts of magnet post link to each other with spliced pole 6, link up the trompil on coil housing 4 and be connected with panel 7 by spliced pole 6, 7 lower surfaces of panel distribute a plurality of promotion posts 8, coil 1, magnet post 2 and part spliced pole 6 seal inside coil housing 4, panel 7 with promote the post 8 and be located coil housing 4 outsidely. The bottom plate of the coil shell 4 is provided with an opening through which the connecting column 6 passes, and the connecting column vertically moves in the opening of the bottom plate. As shown in figure 3, the waterproof capsule 5 comprises a capsule base and a waterproof rubber sleeve fixed on the capsule base, a movable contact piece 12 and a static contact piece 13 form the capsule base through an injection molding mode and are arranged inside the waterproof rubber sleeve, the movable contact piece 12 and the static contact piece 13 are fixed on the capsule base, the movable contact piece 12 is positioned above the static contact piece 13, the movable contact piece 12 and the static contact piece 13 are fixed on the capsule base and are led out by being coated by the capsule base, and the leading-out ends are connected with corresponding wiring ends. An insulating elastic member is provided between the movable contact piece 12 and the fixed contact piece 13 for assisting and correcting deformation and springback of the movable contact piece 12 and the fixed contact piece 13, contacts are provided on both the movable contact piece 12 and the fixed contact piece 13, and the movable contact piece 12 and the fixed contact piece 13 are configured to contact each other by means of the respective contacts. The pushing column 8 is opposite to the movable contact 12 of the waterproof capsule 5, the magnet column 2 is driven to move downwards when the coil 1 is electrified, and the magnet column 2 is driven to move upwards and reset by the upward force applied to the magnet column 2 by the iron column 9 when the coil 1 is powered off. When the magnet column 2 moves downwards, the pushing column 8 is driven to push the waterproof capsule 5 downwards to enable the movable contact piece 12 to deflect downwards to be in contact with and conducted with the static contact piece 13, and when the magnet column 2 moves upwards, the pushing device moves upwards to be far away from the waterproof capsule 5 to enable the movable contact piece 12 to be separated from the static contact piece 13.
In this embodiment, the rectifier bridge 11 converts alternating current into direct current, keeping the magnetic pole direction of the coil 1 fixed. In this embodiment, as shown in fig. 1, the upper end of the magnet column 2 is S-level and the lower end is N-level. After the coil 1 is electrified, a magnetic field is excited, the direction of the magnetic field excited by the coil 1 is opposite to the inherent direction of the magnetic field of the magnet column 2, so that the coil 1 and the magnet column 2 repel each other, and after the coil 1 is electrified, the magnetic field is excited to magnetize the iron column 9 at the same time, the direction of the magnetization of the iron column 9 is the same as the direction of the magnetic field of the coil 1 and is opposite to the direction of the magnetic field excited by the magnet column 2, so that the iron column 9 and the magnet column 2 repel each other, and the magnet column 2 moves downwards.
After the coil is powered off, the magnetic field excited by the coil disappears, the magnet column 2 loses the downward power, the magnetic field excited by the magnet column 2 temporarily magnetizes the iron column 9, the magnetization direction of the iron column 9 is the same as that of the magnetic field of the magnet column 2, the iron column 9 and the magnet column 2 attract each other, and the magnet column 2 moves upwards.
In this embodiment, for a plurality of contacts, i.e., a plurality of pairs of movable and static contacts, each pair of movable and static contact combination may be placed in a waterproof glue casing, i.e., one pair of contacts in a waterproof capsule, or, of course, a plurality of pairs of movable and static contacts may be placed in a waterproof glue casing, i.e., a plurality of contacts in a large waterproof capsule. The relay is a device for controlling strong current by weak current, and in the embodiment, the relay controls 4 pairs of contacts.
Example 2: as shown in fig. 2, in an electromagnetic relay, a rectifier bridge 11 is connected between an ac power source and a coil 1 of the electromagnetic relay to shape ac power into dc power for the coil 1, the electromagnetic relay includes the coil 1, the surface of the coil 1 is covered by an injection molding material 3, and a coil housing 4 is adapted to the shape of the coil 1 to fix the coil 1 inside the coil housing 4. The magnet post 2 is a permanent magnet, and is formed as a housing by injection molding on the outer periphery of the magnet post 2 in the central hole of the coil 1. The upper end of the tension spring 10 is connected with the coil shell 4 positioned above the magnet column 2, the lower end of the tension spring 10 is connected with the upper end of the magnet column 2, and the tension spring 10 applies upward elastic restoring force to the magnet column 2 when the coil 1 is powered off so as to enable the magnet column 2 to move upwards for resetting. Magnet post 2 lower part links to each other with spliced pole 6, link up the trompil on coil housing 4 and be connected with panel 7 by spliced pole 6, a plurality of promotion posts 8 of panel 7 lower surface distribution, coil 1, magnet post 2 and part spliced pole 6 be located coil housing 4 inside, panel 7 and promotion post 8 are located coil housing 4 outsidely. The bottom plate of the coil housing 4 is provided with an opening through which the connecting column 6 passes, and the outer peripheral surface of the connecting column 6 is in contact with the inner peripheral surface of the opening of the bottom plate when the connecting column moves vertically, and the contact does not cause sealing. As shown in figure 3, the waterproof capsule 5 comprises a capsule base and a waterproof rubber sleeve fixed on the capsule base, a movable contact piece 12 and a static contact piece 13 form the capsule base in an injection molding mode and are arranged inside the waterproof rubber sleeve, the movable contact piece 12 and the static contact piece 13 are fixed on the capsule base, the movable contact piece 12 is located above the static contact piece 13, the movable contact piece 12 and the static contact piece 13 are fixed on the capsule base and are led out by being coated on the capsule base, and the leading-out ends are connected with corresponding wiring ends. An insulating elastic member is provided between the movable contact piece 12 and the fixed contact piece 13 for assisting and correcting deformation and springback of the movable contact piece 12 and the fixed contact piece 13, contacts are provided on both the movable contact piece 12 and the fixed contact piece 13, and the movable contact piece 12 and the fixed contact piece 13 are configured to contact each other by means of the respective contacts. The pushing column 8 is opposite to the movable contact 12 of the waterproof capsule 5, the magnet column 2 is driven to move downwards when the coil 1 is electrified, and the tension spring 10 applies upward force to the magnet column 2 to enable the magnet column 2 to move upwards to reset when the coil 1 is powered off, namely the tension spring 10 applies upward spring tension to the magnet column 2 to enable the magnet column 2 to move upwards to reset when the coil 1 is powered off. When the magnet column 2 moves downwards, the pushing column 8 is driven to push the waterproof capsule 5 downwards to enable the movable contact piece 12 to deflect downwards to be in contact with and conducted with the static contact piece 13, and when the magnet column 2 moves upwards, the pushing device moves upwards to be far away from the waterproof capsule 5 to enable the movable contact piece 12 to be separated from the static contact piece 13.
In this embodiment, the rectifier bridge 11 converts alternating current into direct current, keeping the magnetic pole direction of the coil 1 fixed. In this embodiment, as shown in fig. 2, the upper end of the magnet column 2 is S-level and the lower end is N-level. After the coil 1 is electrified, a magnetic field is excited, the direction of the magnetic field excited by the coil 1 is opposite to the inherent direction of the magnetic field of the magnet column 2, so that the coil 1 and the magnet column 2 repel each other, and after the coil 1 is electrified, the magnetic field is excited to magnetize the iron column 9 at the same time, the direction of the magnetization of the iron column 9 is the same as the direction of the magnetic field of the coil 1 and is opposite to the direction of the magnetic field excited by the magnet column 2, so that the iron column 9 and the magnet column 2 repel each other, and the magnet column 2 moves downwards. The tension spring at the upper end of the housing is stretched downward by the downward movement of the magnet post 2. After the coil is powered off, the magnetic field excited by the coil disappears, the magnet column 2 loses the downward power, the elastic force of the tension spring acts on the magnet column 2, and the magnet column 2 moves upward.
In this embodiment, for a plurality of contacts, i.e., a plurality of pairs of movable and static contacts, each pair of movable and static contact combination may be placed in a waterproof glue casing, i.e., one pair of contacts in a waterproof capsule, or, of course, a plurality of pairs of movable and static contacts may be placed in a waterproof glue casing, i.e., a plurality of pairs of contacts in a large waterproof capsule.
Example 3: the difference from embodiment 2 is that the lower end of a compression spring 14 is connected to the coil housing 4 below the magnet post 2, the upper end of the compression spring 14 is connected to the lower end of the magnet post 2, and the compression spring 14 applies upward elastic restoring force to the magnet post 2 when the coil 1 is powered off to restore the magnet post 2 upward.
Example 4: the difference from the embodiment 2 is that the upper end of the tension spring 10 is connected to the coil housing 4 above the magnet post 2, the lower end of the tension spring 10 is connected to the upper end of the magnet post 2, and the tension spring 10 applies upward elastic restoring force to the magnet post 2 when the coil 1 is powered off to restore the magnet post 2 upward; and the lower end of the pressure spring 14 is connected to the coil housing 4 below the magnet post 2, the upper end of the pressure spring 14 is connected to the lower end of the magnet post 2, and the pressure spring 14 applies upward elastic restoring force to the magnet post 2 when the coil 1 is powered off to enable the magnet post 2 to move upwards for resetting.
In the above embodiment, it has realized electromagnetic relay's all-round waterproof, dustproof, anticreep, explosion-proof effect for this relay can use open-air environment such as open-air in the field, and precipitation is minimum to its influence. Particularly, the scheme can greatly expand the use scene of the relay, so that the relay can be used in moisture, precipitation and even water, the usable range of the controlled electric control device is widened, and the controllable electric control device installed in the water is controllable.
Although the application is illustrated and described herein with reference to specific embodiments, the application is not intended to be limited to the details shown. Rather, various details of the application may be modified within the scope and equivalents of the claims.
Claims (10)
1. An electromagnetic relay is characterized in that the electromagnetic relay is provided with a coil,
Included
a coil (1), wherein the coil (1) is sealed by a coil housing (4) formed by injection molding,
a pull-back device which is fixed by a coil (1), a magnet column (2) is positioned below the pull-back device,
a magnet column (2), the magnet column (2) is arranged in the central hole of the coil (1), the magnet column (2) is driven to move downwards when the coil (1) is electrified, and the magnet column (2) is reset upwards by applying upward force to the magnet column (2) by the pull-back device when the coil (1) is powered off,
the lower part of the magnet column (2) is connected with the pushing device which penetrates through the opening on the bottom plate of the coil shell (4) and is opposite to the movable contact piece (12) of the waterproof capsule (5) positioned outside the coil shell (4) up and down,
waterproof capsule (5), waterproof capsule (5) include the capsule base and fix the waterproof gum cover on the capsule base, movable contact piece (12) and static contact piece (13) set up in the inside of waterproof gum cover, movable contact piece (12) and static contact piece (13) are fixed to the capsule base, and movable contact piece (12) are located static contact piece (13) top, make magnet post (2) drive thrust unit push waterproof capsule (5) down and make movable contact piece (12) skew downwards and switch on with static contact piece (13) contact down, make thrust unit upwards keep away from waterproof capsule (5) and make movable contact piece (12) and static contact piece (13) separation when magnet post (2) are ascending.
2. The electromagnetic relay of claim 1, wherein the capsule base is formed by injection molding.
3. The electromagnetic relay according to claim 1, characterized in that the coil (1), the magnet post (2) and the portion of the pushing device not in contact with the waterproof capsule (5) are located inside the coil housing (4), and the coil housing (4) is adapted to the shape of the coil (1) to fix the coil (1) inside the coil housing (4), and the magnet post (2) is formed around the housing by injection molding.
4. The electromagnetic relay according to claim 3, characterized in that the pushing device comprises a connecting column (6), a panel (7) and a pushing column (8), the lower part of the magnet column (2) is connected with the connecting column (6), the connecting column (6) penetrates through the opening on the coil housing (4) and is connected with the panel (7), a plurality of pushing columns (8) are distributed on the lower surface of the panel (7), the pushing columns (8) are opposite to the moving contact (12) of the waterproof capsule (5), and are contacted or separated with or from the waterproof capsule (5) by the pushing columns (8).
5. The electromagnetic relay according to claim 4, characterized in that the bottom plate of the coil housing (4) has an opening through which the connection post (6) passes, the connection post (6) moving vertically in the bottom plate opening.
6. The electromagnetic relay according to claim 4, characterized in that the pulling-back means is an iron post (9), the iron post (9) applies an upward suction force to the magnet post (2) to return the magnet post (2) upward when the coil (1) is de-energized, and the outer periphery of the iron post (9) forms a housing by injection molding.
7. The electromagnetic relay of claim 4,
the pull-back device is a tension spring (10), the upper end of the tension spring (10) is connected to the coil shell (4) positioned above the magnet column (2), the lower end of the tension spring (10) is connected to the upper end of the magnet column (2), and the tension spring (10) applies upward elastic restoring force to the magnet column (2) when the coil (1) is powered off to enable the magnet column (2) to move upwards for resetting;
or
The pull-back device is a pressure spring (14), the lower end of the pressure spring (14) is connected to a coil shell (4) positioned below the magnet column (2), the upper end of the pressure spring (14) is connected to the lower end of the magnet column (2), and the pressure spring (14) applies upward elastic restoring force to the magnet column (2) when the coil (1) is powered off to enable the magnet column (2) to move upwards for resetting;
or
The pull-back device comprises a tension spring (10) and a pressure spring (14), the upper end of the tension spring (10) is connected to a coil shell (4) positioned above the magnet column (2), the lower end of the tension spring (10) is connected to the upper end of the magnet column (2), and the tension spring (10) applies upward elastic restoring force to the magnet column (2) when the coil (1) is powered off so as to enable the magnet column (2) to move upwards for resetting; and the lower end of a pressure spring (14) is connected to a coil shell (4) positioned below the magnet column (2), the upper end of the pressure spring (14) is connected to the lower end of the magnet column (2), and the pressure spring (14) applies upward elastic restoring force to the magnet column (2) when the coil (1) is powered off so as to enable the magnet column (2) to move upwards for resetting.
8. The electromagnetic relay according to claim 1, characterized in that an insulating elastic member is provided between the movable contact piece (12) and the stationary contact piece (13) for assisting and correcting deformation and rebound of the movable contact piece (12) and the stationary contact piece (13), contacts are provided on both the movable contact piece (12) and the stationary contact piece (13), and the movable contact piece (12) and the stationary contact piece (13) are configured to contact each other by means of the respective contacts.
9. An electromagnetic relay according to claim 1, further comprising a rectifier bridge (11), the rectifier bridge (11) being connected between an ac power source and the coil (1) to shape the ac power to the dc power supply coil (1).
10. An electromagnetic relay according to claim 1, characterized in that the movable contact piece (12) and the stationary contact piece (13) are fixed to and covered by the capsule base and led out, the lead-out terminals being connected to respective terminals.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122735154.3U CN216487880U (en) | 2021-11-09 | 2021-11-09 | Electromagnetic relay |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122735154.3U CN216487880U (en) | 2021-11-09 | 2021-11-09 | Electromagnetic relay |
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| Publication Number | Publication Date |
|---|---|
| CN216487880U true CN216487880U (en) | 2022-05-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202122735154.3U Active CN216487880U (en) | 2021-11-09 | 2021-11-09 | Electromagnetic relay |
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| CN (1) | CN216487880U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116110745A (en) * | 2022-08-17 | 2023-05-12 | 大连赛夫科技有限公司 | Electromagnetic switch and switch control method |
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2021
- 2021-11-09 CN CN202122735154.3U patent/CN216487880U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116110745A (en) * | 2022-08-17 | 2023-05-12 | 大连赛夫科技有限公司 | Electromagnetic switch and switch control method |
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