A high-voltage DC relay with magnetic arc extinguishing

Abstract

The present invention discloses a high-voltage DC relay with a magnetic arc extinguishing mechanism, comprising two static contact terminals and a movable spring. The movable spring is disposed below the two static contact terminals, with both ends of the movable spring correspondingly mated with the bottom ends of the two static contact terminals. A first magnetic steel is disposed around the movable spring at positions corresponding to the contacts, with the polarized side of the first magnetic steel facing the corresponding contacts. A second magnetic steel is also disposed on the side of the two static contact terminals facing away from the static contacts, with the polarized side of the second magnetic steel facing the corresponding contacts, and the polarity of the side of the second magnetic steel facing the contacts is opposite to that of the side of the first magnetic steel facing the contacts. The present invention can enhance the magnetic field strength at the contact point, ensuring that the Lorentz force at the arc starting point is always directed in a direction favorable for arc extinguishing, thereby improving the arc extinguishing effect.

Description

Technical Field

[0001] The present invention relates to a DC relay, in particular to a high-voltage DC relay with magnetic steel arc extinguishing. Background Art

[0002] Most of the existing DC relays adopt a dynamic spring direct-acting type (also known as a solenoid direct-acting type). Its contact part adopts two static contacts and a dynamic spring. The two static contacts are usually installed on the top of the ceramic cover, and the bottom ends of the two static contacts (i.e., the static contact lead ends) extend into the ceramic cover. The dynamic spring is directly distributed in the ceramic cover. The two ends of the dynamic spring serve as dynamic contacts and respectively cooperate with the bottom ends of the two static contacts as static contacts. When the dynamic contacts at both ends of the dynamic spring contact the static contacts at the bottom ends of the two static contacts, the current flows into one of the static contacts and flows out from the other static contact after passing through the dynamic spring; the dynamic spring is installed at one end of the push rod component, and the other end of the push rod component is connected to the moving iron core of the magnetic circuit part. When the coil is connected to the current and the push rod component moves upward, the two ends of the dynamic spring contact respectively contact the two static contacts and connect the load. When the coil disconnects the current, the push rod component moves downward under the action of the reset spring, and the two ends of the dynamic spring separate from the two static contacts respectively, cutting off the load. The high-voltage DC relays in the prior art usually use magnetic steel to extinguish arcs, that is, by configuring magnetic steel around the contacts and using the magnetic field generated by the magnetic steel to achieve arc blowing. The most typical magnetic steel configuration scheme is to configure a magnetic steel on the outside of both ends of the length of the moving reed. Although this dual-magnet solution has a better arc blowing direction and meets the requirement of non-polarity, the magnetic field strength is weak (especially at the arc starting point, the center of the lead-out end). For large-load products, the ceramic cavity is larger, which makes the magnetic field strength of the arc extinguishing part reaching the arc starting point smaller, the initial arc extinguishing effect is not good, and it may not be able to extinguish the arc in time under space-constrained conditions. Therefore, this type of high-voltage DC relay in the prior art cannot meet the demand for increased system loads in new energy vehicles and energy storage projects. Summary of the Invention

[0003] The purpose of the present invention is to overcome the shortcomings of the existing technology and provide a high-voltage DC relay with magnetic steel arc extinguishing. Through structural improvement, the magnetic field strength of the contact point can be enhanced, so that the Lorentz force at the arc starting point is always in the direction that is conducive to arc extinguishing, thereby improving the arc extinguishing effect.

[0004] The technical solution adopted by the present invention to solve its technical problems is: a high-voltage DC relay with magnetic arc extinguishing, comprising two static contact lead-out terminals and a movable spring; the movable spring is arranged below the two static contact lead-out terminals, and the two ends of the movable spring serve as movable contacts and respectively cooperate with the bottom ends of the two static contact lead-out terminals serving as static contacts; first magnetic steels are respectively arranged around the movable spring at positions corresponding to the contacts, with the polarized sides of the first magnetic steels facing the corresponding contacts, so as to achieve arc extinguishing by utilizing the horizontal magnetic field formed by the first magnetic steels; second magnetic steels are further installed on the sides of the two static contact lead-out terminals facing away from the static contacts, with the polarized sides of the second magnetic steels facing the corresponding contacts, and the polarity of the side of the second magnetic steel facing the contacts is opposite to the polarity of the side of the first magnetic steel facing the contacts, so as to achieve arc extinguishing by utilizing the first and second magnetic steels to form a longitudinal magnetic field at the contacts and enhance the magnetic field strength at the contacts.

[0005] The upper end of the static contact lead-out end is provided with a downwardly recessed groove, and the second magnetic steel is embedded in the groove and is placed close to the corresponding contact.

[0006] The second magnetic steel is circular; the cross section of the groove is a circular shape corresponding to the second magnetic steel; the second magnetic steel is located in the middle of the static contact lead-out end in the corresponding same horizontal plane.

[0007] The two moving contacts are convex buds integrally formed at both ends of the moving reed.

[0008] There are two first magnetic steels, which are respectively arranged outside the two ends of the length of the movable spring; the convex buds at both ends of the movable spring are respectively in eccentric contact with the bottom ends of the two static contact lead-out ends.

[0009] The convex buds at both ends of the movable spring are respectively arranged at the end edges of the two ends of the movable spring; the contact positions of the two static contact lead-out ends and the convex buds at both ends of the movable spring are located at the relatively outer sides of the bottom ends of the two static contact lead-out ends.

[0010] The bottom end surface of the static contact lead-out end is circular, and the contact position between the static contact lead-out end and the convex burl of the movable spring does not exceed the radius of the circle.

[0011] The DC relay also includes two first U-shaped yokes respectively configured on the two first magnetic steels, the U-shaped bottom walls of the two first U-shaped yokes respectively contact the side of the corresponding first magnetic steel facing away from the corresponding contact, and the U-shaped side walls of the two first U-shaped yokes are respectively configured on both sides of the width of the movable spring piece and opposite to the corresponding contacts.

[0012] The projection of the matching positions of the moving and static contacts on the reference horizontal plane falls within the projection of the frame outline surrounded by the first U-shaped yoke on the reference horizontal plane.

[0013] There are four first magnetic steels, which are respectively arranged on the outside of both sides of the width of the movable spring and opposite to the corresponding contacts, and the polarities of the two first magnetic steels corresponding to the same contact facing the corresponding contact are set to be the same.

[0014] The DC relay also includes two second U-shaped yokes respectively arranged on the four first magnetic steels, the U-shaped bottom walls of the two second U-shaped yokes respectively correspond to the outer sides of the two ends of the length of the movable spring piece, and the U-shaped side walls of the two second U-shaped yokes are respectively arranged on both sides of the width of the movable spring piece and contact the side of the first magnetic steel at the corresponding position facing away from the corresponding contact.

[0015] The movable spring piece corresponds to the middle position of the height of the first magnetic steel.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The present invention employs a second magnet mounted on the side of the two static contact leads facing away from the static contacts, with the polarized side of the second magnet facing the corresponding contacts. The polarity of the side of the second magnet facing the contacts is opposite to that of the side of the first magnet facing the contacts. This utilizes the first and second magnets to form a longitudinal magnetic field at the contacts, enhancing the magnetic field strength there and further extinguishing the arc. This structure enhances the longitudinal arc-strike magnetic field, increases the magnetic field strength at the center of the lead, and accelerates the arc-extinguishing speed at the moment of arcing.

[0018] 2. The present invention employs two movable contacts formed as integrally formed convex ridges at each end of the movable spring, which eccentrically contact the bottom ends of the two stationary contact leads. This structure, through the coordination of the longitudinal arc-starting magnetic field and the eccentric contact points, strengthens the magnetic field intensity at the contact points, ensuring that the Lorentz force at the arc-starting point is always oriented in a direction favorable to arc extinguishing, thereby improving arc extinguishing effectiveness.

[0019] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments; however, the high-voltage DC relay with magnetic steel arc extinguishing of the present invention is not limited to the embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 1 is a schematic diagram of the three-dimensional structure of the first embodiment of the present invention;

[0021] Figure 2 This is a schematic diagram of the exploded three-dimensional structure of the first embodiment of the present invention;

[0022] Figure 3 is a top view of embodiment 1 of the present invention;

[0023] Figure 4is a cross-sectional view of the first embodiment of the present invention (shown along the length direction of the movable spring);

[0024] Figure 5 is a top view of a second embodiment of the present invention;

[0025] Figure 6 1 is a cross-sectional view of a second embodiment of the present invention (shown along the width direction of the movable spring at one of the contact points);

[0026] Figure 7 2 is a cross-sectional view of the first embodiment of the present invention (shown along the width direction of the movable spring at another contact point). DETAILED DESCRIPTION

[0027] Example 1

[0028] See also Figures 1 to 4 As shown, a high-voltage DC relay with arc extinguishing with magnetic steel of the present invention comprises two static contact lead-out terminals 1 and a movable spring 2; the movable spring 2 is arranged below the two static contact lead-out terminals 1, and the two ends of the movable spring 2 serve as movable contacts and respectively cooperate with the bottom ends of the two static contact lead-out terminals 1 as static contacts; a first magnetic steel 3 is respectively arranged on the outside of the two ends of the length of the movable spring 2, and the polarity side of the first magnetic steel 3 faces the corresponding contact, so as to utilize the horizontal magnetic field (such as Figure 3 As shown) to achieve arc extinguishing; in the two static contact lead-out terminals 1, a second magnetic steel 4 is further installed on the side facing away from the static contact, and the polar side of the second magnetic steel 4 is directed toward the corresponding contact, and the polarity of the side of the second magnetic steel 4 facing the contact is opposite to the polarity of the side of the first magnetic steel facing the contact, so as to form a longitudinal magnetic field at the contact by utilizing the first magnetic steel 3 and the second magnetic steel 4 (as shown) Figure 4 and enhances the magnetic field strength at the contacts to further extinguish the arc.

[0029] In this embodiment, the magnetic polarity of the side of the first magnetic steel 3 corresponding to one end of the movable spring piece 2 facing the contact is an N pole, and the magnetic polarity of the side of the first magnetic steel 3 corresponding to the other end of the movable spring piece 2 facing the contact is an S pole. The magnetic polarity of the side of the second magnetic steel 4 corresponding to one end of the movable spring piece 2 facing the contact is an S pole, and the magnetic polarity of the side of the first magnetic steel 3 corresponding to the other end of the movable spring piece 2 facing the contact is an N pole.

[0030] In this embodiment, the upper ends of the two static contact lead-out terminals 1 are respectively provided with downwardly recessed grooves 11 , and the second magnetic steel 4 is embedded in the grooves 11 and is positioned close to the corresponding contacts.

[0031] In this embodiment, the second magnetic steel 4 is circular; the cross section of the groove 11 is a circular shape corresponding to the second magnetic steel; the second magnetic steel 4 is located in the middle of the static contact lead-out terminal 1 in the corresponding same horizontal plane.

[0032] In this embodiment, the two moving contacts are formed as protrusions 21 integrally formed at both ends of the moving reed 2. The protrusions 21 at both ends of the moving reed 2 are eccentrically contacted with the bottom ends of the two static contact lead terminals 1. The protrusions 21 are formed by striking the moving reed 2 along its thickness.

[0033] In this embodiment, the convex buds 21 at both ends of the movable spring 2 are respectively provided at the end edges of the movable spring; the contact positions 12 between the two static contact lead-out terminals 1 and the convex buds at both ends of the movable spring are located at the relatively outer sides of the bottom ends of the two static contact lead-out terminals.

[0034] In this embodiment, the bottom end surface of the static contact lead-out terminal 1 is circular, and the contact position 12 between the static contact lead-out terminal and the convex bud 21 of the movable spring 2 does not exceed the radius of the circle.

[0035] In this embodiment, the movable spring piece 2 corresponds to the middle position of the height of the first magnetic steel 3 .

[0036] In this embodiment, the DC relay further includes two first U-shaped yokes 5 respectively arranged on the two first magnetic steels, and the U-shaped bottom walls 51 of the two first U-shaped yokes 5 are respectively in contact with the side of the corresponding first magnetic steel 3 facing away from the corresponding contact, and the U-shaped side walls 52 of the two first U-shaped yokes 5 are respectively arranged on both sides of the width of the movable spring 2 and opposite to the corresponding contacts.

[0037] In this embodiment, the projection of the mating positions of the moving and static contacts on the reference horizontal plane falls within the projection of the frame outline surrounded by the first U-shaped yoke 5 on the reference horizontal plane.

[0038] The present invention discloses a high-voltage DC relay with arc extinguishing magnets. In the two static contact leads 1, a second magnet 4 is installed on the side facing away from the static contacts. The polarized side of the second magnet 4 faces the corresponding contacts, and the polarity of the side of the second magnet 4 facing the contacts is opposite to that of the side of the first magnet 3 facing the contacts. This structure utilizes the first and second magnets 3 and 4 to form a longitudinal magnetic field at the contacts, thereby enhancing the magnetic field strength at the contacts and further achieving arc extinguishing. This structure of the present invention can enhance the longitudinal arc-strike magnetic field, increase the magnetic field strength at the center of the leads, and accelerate the speed of magnetic blowout at the moment of arcing. The present invention employs two moving contacts formed as convex buds 21 integrally formed at the ends of the moving reed 2, with the convex buds 21 at the ends of the moving reed 2 eccentrically contacting the bottom ends of the two static contact leads 1. This structure of the present invention, through the coordination of the longitudinal arc-strike magnetic field and the eccentric contact points, can enhance the magnetic field strength at the contact points, ensuring that the Lorentz force at the arc-strike point is always oriented in a direction favorable to arc extinguishing, thereby improving the arc extinguishing effect.

[0039] In this embodiment, the magnetic polarity of the side of the first magnetic steel 3 corresponding to one end of the movable spring piece 2 facing the contact is an N pole, and the magnetic polarity of the side of the first magnetic steel 3 corresponding to the other end of the movable spring piece 2 facing the contact is an S pole. Of course, the magnetic polarity of the side of the first magnetic steel 3 corresponding to one end of the movable spring piece 2 facing the contact can also be an S pole, while the magnetic polarity of the side of the first magnetic steel 3 corresponding to the other end of the movable spring piece 2 facing the contact can be an N pole, or the magnetic polarity of the sides of both first magnetic steels 3 facing the contact can be set to an N pole or both to an S pole.

[0040] Example 2

[0041] See also Figures 5 to 7 As shown, a high-voltage DC relay with arc extinguishing magnetic steel of the present invention is different from the first embodiment in that there are four first magnetic steels 3, and the four first magnetic steels 3 are respectively arranged on the outside of both sides of the width of the movable spring 2 and opposite to the corresponding contacts, and the polarity of the two first magnetic steels 3 corresponding to the same contact facing the corresponding contact is set to be the same.

[0042] In this embodiment, the magnetic polarity of the two first magnetic steels 3 corresponding to one end of the movable spring piece 2 facing the contact is both N-pole, and the magnetic polarity of the two first magnetic steels 3 corresponding to the other end of the movable spring piece 2 facing the contact is both S-pole. The magnetic polarity of the second magnetic steel 4 corresponding to one end of the movable spring piece 2 facing the contact is S-pole, and the magnetic polarity of the first magnetic steel 3 corresponding to the other end of the movable spring piece 2 facing the contact is N-pole.

[0043] In this embodiment, the DC relay further includes two second U-shaped yokes 6 respectively arranged on the four first magnetic steels 3, and the U-shaped bottom walls 61 of the two second U-shaped yokes 6 respectively correspond to the outer sides of the two ends of the length of the movable spring piece 2, and the U-shaped side walls 62 of the two second U-shaped yokes 6 are respectively arranged on both sides of the width of the movable spring piece 2 and in contact with the side of the first magnetic steel 3 at the corresponding position facing away from the corresponding contact.

[0044] In this embodiment, the magnetic polarity of the two first magnetic steels 3 corresponding to one end of the movable spring piece 2 facing the contact is both N-pole, and the magnetic polarity of the two first magnetic steels 3 corresponding to the other end of the movable spring piece 2 facing the contact is both S-pole. Of course, the magnetic polarity of the two first magnetic steels 3 corresponding to one end of the movable spring piece 2 facing the contact is also S-pole, and the magnetic polarity of the two first magnetic steels 3 corresponding to the other end of the movable spring piece 2 facing the contact is also N-pole; or the magnetic polarity of the four first magnetic steels 3 facing the contact is all set to N-pole or all set to S-pole.

[0045] In the case where the sides of the four first magnetic steels 3 facing the contacts are all set as N poles or all set as S poles, two first magnetic steels 3 corresponding to the same side of the width of the movable spring piece 2 can also be connected into one.

[0046] The above is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as above in terms of a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art can, without departing from the scope of the technical solution of the present invention, use the technical content disclosed above to make many possible changes and modifications to the technical solution of the present invention, or modify it into an equivalent equivalent embodiment. Therefore, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention should fall within the scope of protection of the technical solution of the present invention.

Claims

1. A high-voltage DC relay with arc extinguishing magnet, comprising two static contact terminals and a movable spring; the movable spring is disposed below the two static contact terminals, with both ends of the movable spring acting as movable contacts and correspondingly engaging with the bottom ends of the two static contact terminals acting as static contacts; first magnets are disposed around the movable spring at positions corresponding to the contacts, with the polarized sides of the first magnets facing the corresponding contacts, so that arc extinguishing is achieved by utilizing the horizontal magnetic field generated by the first magnets; and characterized in that: In the two static contact lead-out ends, a second magnet is installed on the side facing away from the static contact, and the polar side of the second magnet is directed toward the corresponding contact. The polarity of the side of the second magnet facing the contact is opposite to the polarity of the side of the first magnet facing the contact, so as to utilize the first magnet and the second magnet to form a longitudinal magnetic field at the contact and enhance the magnetic field strength at the contact to further achieve arc extinguishing.

2. The high-voltage DC relay with magnetic steel arc extinguishing according to claim 1, characterized in that: The upper end of the static contact lead-out end is provided with a downwardly recessed groove, and the second magnetic steel is embedded in the groove and is placed close to the corresponding contact.

3. The high-voltage DC relay with magnetic steel arc extinguishing according to claim 2, characterized in that: The second magnetic steel is circular; the cross section of the groove is a circular shape corresponding to the second magnetic steel; the second magnetic steel is located in the middle of the static contact lead-out end in the corresponding same horizontal plane.

4. The high-voltage DC relay with magnetic steel arc extinguishing according to claim 3, characterized in that: The two moving contacts are convex buds integrally formed at both ends of the moving reed.

5. The high-voltage DC relay with magnetic steel arc extinguishing according to claim 4, characterized in that: There are two first magnetic steels, which are respectively arranged outside the two ends of the length of the movable spring; the convex buds at both ends of the movable spring are respectively in eccentric contact with the bottom ends of the two static contact lead-out ends.

6. The high-voltage DC relay with magnetic steel arc extinguishing according to claim 5, characterized in that: The convex buds at both ends of the movable spring are respectively arranged at the end edges of the two ends of the movable spring; the contact positions of the two static contact lead-out ends and the convex buds at both ends of the movable spring are located at the relatively outer sides of the bottom ends of the two static contact lead-out ends.

7. The high-voltage DC relay with magnetic steel arc extinguishing according to claim 6, characterized in that: The bottom end surface of the static contact lead-out end is circular, and the contact position between the static contact lead-out end and the convex burl of the movable spring does not exceed the radius of the circle.

8. The high-voltage DC relay with magnetic steel arc extinguishing according to claim 7, characterized in that: The DC relay also includes two first U-shaped yokes respectively configured on the two first magnetic steels, the U-shaped bottom walls of the two first U-shaped yokes respectively contact the side of the corresponding first magnetic steel facing away from the corresponding contact, and the U-shaped side walls of the two first U-shaped yokes are respectively configured on both sides of the width of the movable spring piece and opposite to the corresponding contacts.

9. The high-voltage DC relay with magnetic steel arc extinguishing according to claim 8, characterized in that: The projection of the matching positions of the moving and static contacts on the reference horizontal plane falls within the projection of the frame outline surrounded by the first U-shaped yoke on the reference horizontal plane.

10. The high-voltage DC relay with magnetic steel arc extinguishing according to claim 3 or 4, characterized in that: There are four first magnetic steels, which are respectively arranged on the outside of both sides of the width of the movable spring and opposite to the corresponding contacts, and the polarities of the two first magnetic steels corresponding to the same contact facing the corresponding contact are set to be the same.

11. The high-voltage DC relay with magnetic steel arc extinguishing according to claim 10, characterized in that: The DC relay also includes two second U-shaped yokes respectively arranged on the four first magnetic steels, the U-shaped bottom walls of the two second U-shaped yokes respectively correspond to the outer sides of the two ends of the length of the movable spring piece, and the U-shaped side walls of the two second U-shaped yokes are respectively arranged on both sides of the width of the movable spring piece and contact the side of the first magnetic steel at the corresponding position facing away from the corresponding contact.

12. The high-voltage DC relay with magnetic steel arc extinguishing according to claim 1, characterized in that: The movable spring piece corresponds to the middle position of the height of the first magnetic steel.

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