WO2016155637A1

WO2016155637A1 - Arc extinction magnetic circuit having misaligned magnetic steel and direct-current relay thereof

Info

Publication number: WO2016155637A1
Application number: PCT/CN2016/077945
Authority: WO
Inventors: 钟叔明; 施生圣
Original assignee: 厦门宏发电力电器有限公司
Priority date: 2015-03-31
Filing date: 2016-03-31
Publication date: 2016-10-06
Also published as: CN104882335B; CN104882335A

Abstract

Disclosed are an arc extinction magnetic circuit having misaligned magnetic steel and a direct-current relay thereof. The arc extinction magnetic circuit comprises a contact portion. The contact portion comprises two stationary contacts respectively for providing current inflow and outflow and a movable contact spring. Two ends of the movable contact spring respectively cooperate with the two stationary contacts. Each of the outer sides of the two ends in the length direction of the movable contact spring is respectively provided with a piece of first magnetic steel. Each of the outer sides of the two ends in the width direction of the movable contact spring is respectively provided with a piece of second magnetic steel, and the two pieces of second magnetic steel are misaligned. The two pieces of first magnetic steel face each other with opposite poles, and the two pieces of second magnetic steel also face each other with opposite poles. In the present invention, two pieces of magnetic steel in the middle in the length direction of the movable contact spring are misaligned, the distance between the two adjacent pieces of magnetic steel is reduced, the strength of a magnetic field between the two adjacent pieces of magnetic steel is then enhanced, thereby greatly enhancing the strength of an arc extinction magnetic field and the strength of the magnetic field which provides ampere force for the movable spring, and substantially increasing the magnetic utilization rate of the magnetic steel.

Description

Arc-extinguishing magnetic circuit with magnetic steel misalignment distribution and its DC relay

Technical field

The invention relates to a DC relay, in particular to an arc-extinguishing magnetic circuit with a magnetic steel misalignment distribution and a DC relay thereof for cutting off a high-voltage, high-current DC load.

Background technique

A relay is an electronic control device that has a control system (also called an input loop) and a controlled system (also called an output loop). It is usually used in an automatic control circuit. It actually uses a small current to control the larger An "automatic switch" of current. Therefore, it plays the role of automatic adjustment, safety protection and conversion circuit in the circuit. DC relay is one of the relays. Most of the existing DC relays adopt the dynamic reed direct-acting (also called solenoid direct-acting) scheme. For example, Hongfa, Tyco, Panasonic, LS and other manufacturers use snails. Line pipe direct-acting scheme.

In the contact portion of the DC relay, when the current flows through the contact, due to the contraction of the current line, mutually repulsive electric power is generated between the contacts, that is, the moving reed of the moving contact is subjected to dynamic and static movement. The repulsion of the contact separation, also known as the electric repulsion. In order to resist such contact repulsive force, a force is applied to the moving spring by a spring to increase the pressure between the moving and stationary contacts. In theory, the larger the current, the greater the electric repulsion and the greater the spring force required. However, an excessively large spring force requires a stronger magnetic circuit to drive, so that the amount of enameled wire is greatly increased, resulting in disadvantages such as increased cost and large product volume.

In order to solve the problem of the electric repulsion of such dynamic and static contacts, the patent application "contact bridge with arc extinguishing magnet" (Patent Publication No. CN102246250A) proposes a six-magnet steel scheme, that is, in the movable reed On both sides of the width, three pieces of magnetic steel are respectively arranged, and the middle magnetic steel is used to generate an ampere force to resist the electric repulsion to increase the pressure between the contacts, and the magnetic arc is used to realize the arcing, so that the arc-extinguishing magnetic circuit is Can extinguish the arc and resist electric repulsion. However, the contact bridge with the arc extinguishing magnet has the following disadvantages: First, the magnetic utilization rate is low, the magnetic field between the magnetic steels is disordered, and the intensity of the arc extinguishing magnetic field between the contacts is decreased; secondly, the cost is high; The magnetic utilization rate of the magnetic steel is low. When a large current flows through the moving reed, the moving spring causes the moving spring to generate a force to disengage between the contacts, thereby weakening the middle magnetic steel to the moving spring. Ampere.

The applicant's prior patent application "a DC relay" (Patent Publication No. CN104091726A), proposes a four-magnet steel scheme in which a magnetic steel is respectively disposed outside the two ends of the length of the moving spring, and a magnetic steel is respectively disposed outside the middle of the length of the moving spring. Blowing is performed by magnetic steel on the outer side of both ends of the length of the moving spring, and the magnetic force is generated by the outer magnetic steel in the middle of the length of the moving spring to resist the electric repulsion between the moving and stationary contacts, thereby The drawbacks caused by the "contact bridge with arc extinguishing magnet" (Patent Publication No. CN102246250A) are solved. However, the strength of the magnetic field due to the strength of the arc extinguishing magnetic field and the ampere force of the moving spring is generated by the magnetic flux leakage of the magnetic steel, so that the magnetic utilization rate of the magnetic steel is relatively low. FIG. 1 is a schematic diagram showing the distribution of magnetic lines of the four-magnet steel scheme. As shown in FIG. 1, four magnetic steels are distributed around the moving spring 101, and two magnets 102 are distributed on the length of the moving spring 101. On the outer side of both ends, the other two magnets 103 are distributed outside the middle of the length of the moving reed 101, and the two magnets 102 each form a main magnetic flux 104, and each of the two magnetic steels 103 forms a main magnetic flux 105. Two sets of leakage fluxes 106 are formed between two adjacent magnets. It can be seen from Fig. 1 that the strength of the arc-extinguishing magnetic field and the magnetic field strength that provides the amperage force to the moving spring are mainly caused by magnetic flux leakage. Moreover, between the main magnetic flux 104 and the leakage magnetic flux 106, in some areas, they cancel each other, and further weaken the magnetic field strength. In this four-magnet steel scheme, it is further proposed to add a yoke 107 between two magnets 102 (i.e., magnetic steel distributed outside the ends of the length of the moving reed) (as shown in Fig. 2). However, the main magnetic flux 108 formed by the two magnets 102 can only enhance the strength of the arc-extinguishing magnetic field, and the leakage flux 109 also cancels the ampere force of the moving spring. Therefore, the magnetic utilization rate of the magnetic steel It is relatively low.

In addition, as shown in FIG. 1, the leakage magnetic flux 106 is generated between the adjacent magnetic steel 102 and the magnetic steel 103. Since the magnetic steel 103 is in the middle of the length of the moving spring 101, the distance from the magnetic steel 102 Relatively far, this makes the leakage flux 106 relatively small, so that the strength of the magnetic field used to achieve arc extinguishing and the strength of the magnetic field used to provide amps to the moving spring are insufficient.

Summary of the invention

The object of the present invention is to overcome the deficiencies of the prior art, and provide an arc-extinguishing magnetic circuit with a magnetic steel misalignment distribution and a DC relay thereof, which are arranged by dislocation of two magnetic steels in the middle of the length of the moving spring. The distance between the two magnets is shortened to enhance the strength of the magnetic field formed between the two adjacent magnets, so that the strength of the arc-extinguishing magnetic field and the magnetic field strength of the urging spring are greatly enhanced, so that the magnetic steel The magnetic utilization rate is greatly improved.

The technical solution adopted by the present invention to solve the technical problem thereof is:

An arc extinguishing magnetic circuit for dislocation distribution of a magnetic steel is provided, comprising a contact portion, wherein the contact portion comprises two static contacts for respectively supplying current and flowing out, and a moving spring piece, both ends of the moving spring piece Corresponding to two static contacts respectively; a first magnetic steel is respectively arranged on the outer sides of the two ends of the length of the movable spring; and a second magnetic steel is respectively arranged on the outer sides of the two sides of the width of the movable spring, wherein The polarities of the two first magnetic steels are opposite, and the polarities of the two second magnetic steels are also opposite in nature; the two second magnetic steels are misaligned, and the second magnetic steel of the misaligned distribution is adjacent to the polarity. The first magnetic steel direction set by the opposite polarity is offset.

As a preferred embodiment of the present invention, the two second magnetic steels are respectively disposed at positions where the two stationary contacts are in contact with the movable spring.

As a preferred embodiment of the present invention, the arc extinguishing magnetic circuit further includes two yoke clips with magnetic conductive functions, and two yoke iron clips are respectively connected between the corresponding first magnetic steel and the second magnetic steel; The polarities of the corresponding first magnet and the second magnet toward the movable reed are mutually opposite.

As a preferred embodiment of the present invention, in the two second magnetic steels, one of the second magnetic steels has an N pole facing the moving reed, and the N pole is opposite to the moving reed, and the second magnetic steel is disposed on the moving reed. On the right side of the current flow, the ampere force generated by the magnetic field of the four magnetic steels is used to resist the electric repulsion between the moving and stationary contacts, and the pressure between the moving and stationary contacts is increased.

As a preferred embodiment of the present invention, in the two second magnetic steels, one of the second magnetic steels has an N pole facing the moving reed, and the N pole is opposite to the moving reed, and the second magnetic steel is disposed on the moving reed. On the left side of the current flow, the ampere force generated by the magnetic field of the four magnetic steels is used to match the electric repulsion between the moving and stationary contacts, and the separation force between the moving and stationary contacts is increased.

The invention also provides a DC relay comprising the above-mentioned arc extinguishing magnetic circuit.

The arc-extinguishing magnetic circuit and the DC relay of the dislocation distribution of the magnetic steel of the present invention distribute four magnetic steels around the movable and static contacts, and dislocate the two second magnetic steels to make two second magnetic materials. The steel is closer to the two first magnetic steels respectively corresponding to the phase matching, so as to enhance the magnetic field strength formed between the adjacent two magnetic steels, and the magnetic field formed between the adjacent two magnetic steels can be used to extinguish The arc can also be used to provide amperage to the moving spring. Further, the yoke clip is added between the adjacent two magnets. Since the magnetic resistance of the yoke clip is much smaller than the air reluctance, the magnetic flux of the magnet is mainly pulled toward the yoke to form a main magnetic flux. The leakage flux between the two adjacent magnetic steels becomes the main magnetic flux, so that the intensity of the arc-extinguishing magnetic field and the magnetic field strength of the urging spring are greatly enhanced, and four magnetic steels are formed. The magnetic field simultaneously produces the dual function of arc extinguishing and increasing (or reducing) contact pressure. At the same time, the leakage force generated by the leakage flux between the two second magnetic steels is the same as the amperage force generated by the main magnetic flux to the moving spring, and the magnetic flux leakage between the two first magnetic steels The magnetic blowing direction generated by the arc is also consistent with the magnetic blowing direction generated by the main magnetic flux. When a large current flows through the moving reed, the moving reed is subjected to the upward (or downward) ampere force generated by the magnetic field of the four magnetic steels to resist (or match) the electric repulsion between the moving and stationary contacts. Thereby the moving spring is in close contact with the leading end (or quickly separated). When an arc is generated between the moving and stationary contacts, the main magnetic flux generated by the four magnetic steels through the yoke clamp generates a magnetic blow to the arc, so that the arc is quickly extinguished. The polarity of the two second magnetic steels has special requirements. When used to increase the pressure between the moving and moving contacts, one of the two second magnetic steels, the N pole of the second magnetic steel faces the moving reed The second magnetic steel with the N pole facing the moving reed is disposed on the right side of the current flowing to the moving spring; when used to increase the separating force between the moving and static contacts, the quick breaking and the static contact are realized. Among the two second magnetic steels, the N pole of one of the second magnetic steels faces the moving reed, and the second magnetic steel whose N pole faces the moving reed is disposed on the left side of the current flowing of the moving reed.

With the above technical solution, compared with the prior art, the beneficial effects obtained by the present invention are:

(1) Due to the misalignment of the two second magnetic steels, the distance between the adjacent second magnetic steel and the first magnetic steel is shortened, thereby enhancing the magnetic field strength formed between the adjacent two magnetic steels. It also enhances the strength of the arc-extinguishing magnetic field and the magnetic field strength that provides the amperage to the moving spring, which improves the magnetic utilization of the magnetic steel.

(2) Since the yoke clip is further added between the adjacent two magnets, since the magnetic resistance of the yoke clip is much smaller than the air reluctance, the magnetic flux of the magnetic steel is mainly pulled toward the yoke, so that the original The leakage flux between the adjacent two magnets becomes the main magnetic flux, so that the intensity of the arc-quenching magnetic field and the magnetic field strength that provides the amperage to the moving spring are greatly enhanced.

(3) Due to the misalignment of the two second magnetic steels, the strength of the magnetic field formed between the adjacent two magnets is enhanced, and the same magnetic field scheme is used to simultaneously generate the arc extinguishing and increase the contact pressure (or The dual function of fast breaking contacts). That is, the first magnetic steel is also involved in providing an ampoule force to the moving spring, and the second magnetic steel is also involved in the arc extinguishing effect, so that the magnetic utilization rate of the magnetic steel is improved. In the original scheme, the first magnetic steel is only used for arc extinguishing, and the second magnetic steel is only used to provide ampere force to the moving spring.

(4) Since the yoke clamp is also added between the adjacent two magnets, the main magnetic flux can be used to realize the arc extinguishing and the urging force of the moving spring, so that the magnetic utilization rate of the magnetic steel is greatly improved.

(5) This solution is not only suitable for applications where the contacts are closed, the contact loops generate faulty large currents, and it is also suitable for applications where the contacts are turned off to closed. Due to the existence of the electric repulsion of the contact, and the contact jumping back from the process of opening to closing, when the large current is turned on, the product is likely to explode or burn out due to insufficient contact pressure. With this solution, the contact can be provided with strong pressure to make the contacts in close contact and avoid abnormalities.

(6) The scheme is also applicable to when the system abnormally generates a large fault current and needs to be disconnected. When the current becomes larger, the moving spring is subjected to an ampere force opposite to the contact pressure, thereby resisting the contact with the contact electric repulsion. The pressure makes the moving and static contacts separate quickly, and the purpose of cutting off the abnormal current in the circuit is achieved.

DRAWINGS

1 is a schematic view showing a magnetic line distribution of a prior art four-magnet steel scheme;

2 is a schematic view showing the magnetic line distribution of two magnetic steels of the prior art four-magnet steel scheme;

3 is a schematic view showing a magnetic line distribution of an arc extinguishing magnetic circuit of the present invention;

4 is a schematic view showing the distribution of magnetic lines of the arc extinguishing magnetic circuit of the present invention;

Figure 5 is a schematic view showing the generation of Ampere force of the arc extinguishing magnetic circuit of the second embodiment of the present invention;

6 is a schematic view showing the distribution of magnetic lines of the arc extinguishing magnetic circuit of the third embodiment of the present invention;

Figure 7 is a schematic view showing the distribution of magnetic lines of the arc extinguishing magnetic circuit of the fourth embodiment of the present invention;

Figure 8 is a schematic view showing the distribution of magnetic lines of the arc extinguishing magnetic circuit of the fifth embodiment of the present invention;

Figure 9 is a schematic view showing the generation of amperage of the arc extinguishing magnetic circuit of the fifth embodiment of the present invention;

Figure 10 is a schematic view showing the application of the DC relay of the fifth embodiment of the present invention.

detailed description

The technical solution of the present invention will be described in detail below with reference to the accompanying drawings and embodiments.

Embodiment 1

Referring to FIG. 3, a magnetic arc-displacement magnetic arc-dissipating magnetic circuit of the present invention includes a contact portion, and the contact portion includes two static contacts, that is, a static contact 11, respectively, for supplying current into and out of the flow, The static contact 12 and a moving spring 21, the two ends of the moving spring 21 are respectively matched with the two static contacts 11, 12, when the moving and static contacts are in contact, the current I is made by the static contact 11 flows in, passes through the movable spring 21, and flows out from the stationary contact 12; a first magnetic steel 31 is respectively disposed on the outer sides of both ends of the length of the movable spring 21; and is disposed on the outer sides of both sides of the width of the movable spring There is a second magnetic steel 32, wherein the polarities of the two first magnetic steels 31 are opposite, and the polarities of the two second magnetic steels 32 are also opposite to each other; the two second magnetic steels 32 are misaligned, that is, The two second magnetic steels 32 are respectively disposed on the side of the middle of the length of the moving spring, and are in a non-opposed state, which is equivalent to dislocation distribution of the two magnetic steels in the middle of the length of the moving spring, and is misaligned. The second magnetic steel 32 is biased toward the first magnetic steel 31 in which the adjacent polarities are disposed oppositely, that is, when the misalignment is performed, the N pole faces the moving A second magnet plate 32 biased toward the S pole of the first magnet 31 of the movable spring, The second magnetic steel 32 whose S pole faces the moving spring is biased toward the first magnetic steel 31 whose N pole faces the moving spring.

In the four magnetic steels, the magnetic lines of the magnetic field of the two first magnetic steels 31 are the main magnetic fluxes 61, and the magnetic lines of the magnetic fields of the two second magnetic steels 32 are the main magnetic fluxes 62, and the two first magnetic steels 31 The magnetic field line between the magnetic field is the leakage flux 53, and the magnetic field line of the magnetic field between the two second magnets 32 is the leakage flux 54; between the adjacent two pieces of magnetic steel, that is, the first magnetic steel 31 and the A magnetic field is also formed between the two magnetic steels 32, and the magnetic field lines of the magnetic field between the first magnetic steel 31 and the second magnetic steel 32 are also leakage magnetic fluxes 63. What can be used for arc extinguishing is the leakage flux 53 between the two first magnets 31 and the main flux 61 of the two first magnets 31 themselves, which can be used to generate ampere forces against the moving and stationary contacts. The leakage flux 54 between the two second magnets 32 of the electric repulsive force and the main flux 62 of the two second magnets 32 themselves; the magnetic flux leakage between the first magnet 31 and the second magnet 32 Through 63, both arc-extinguishing force and ampere force can be generated to resist the electric repulsion between the moving and stationary contacts.

The present embodiment is applied to resist electric repulsion. Therefore, among the two second magnetic steels 32, the N pole of one of the second magnets 32 faces the moving reed 21, and the N pole faces the second of the moving reed 21. The magnet 32 is disposed on the right side of the current flowing of the moving reed 12 to absorb the electric repulsion between the moving and stationary contacts by the ampere force generated by the magnetic field, and to increase the pressure between the moving and stationary contacts. Thus, the other second magnet 32 is disposed on the left side of the current flowing in the moving reed 12, and the other second magnet 32 is in the S pole toward the moving reed 21.

In this embodiment, among the two first magnetic steels 31, the N pole of one of the first magnetic steels 31 faces the moving spring 21, and the first magnetic steel 31 whose N pole faces the moving spring 21 is disposed on the moving spring. One end of the current of the sheet 12 flows out, and the other first magnet 31 is an S pole facing the movable reed 21, and the S-pole faces the first magnet 31 of the moving reed 21 at the end where the current of the moving reed 12 flows. .

A DC relay of the present invention includes the above-described arc extinguishing magnetic circuit having resistance to electric repulsion.

Embodiment 2

Referring to FIG. 4 to FIG. 5, the arc extinguishing magnetic circuit of the magnetic steel misalignment distribution of the present invention is different from that of the first embodiment in that the arc extinguishing magnetic circuit further includes two yokes having magnetic permeability. The iron clip 41 and the two yoke clips 41 are respectively connected between the corresponding first magnet 31 and the second magnet 32; the corresponding first magnet 31 and the second magnet 32 are oriented toward the moving spring The polarities of the sheets are mutually opposite. Thus, in the periphery where the movable and static contacts are matched, there are two sets of the first magnet 31 and the second magnet 32 to which the yoke clip 41 is attached.

Due to the yoke clip 41, the magnetic resistance of the yoke clip is much smaller than the air reluctance, so that the magnetic flux of the magnetic steel is mainly clamped toward the yoke, so that the leakage flux between the two adjacent magnets Become the main flux. In this way, the ampere force generated by the magnetic fields of the four magnetic steels can be utilized to resist the electric repulsion forces F11 and F12 between the moving and stationary contacts, thereby increasing the pressure between the moving and stationary contacts.

Thus, the two sets of the first magnet 31 and the second magnet 32 to which the yoke clip 41 is attached are the S pole and the S pole of the second magnet 32 of the N pole facing the moving reed 21, respectively. The N pole of the other first magnet 31 of the moving spring 21 is connected by a yoke clamp 41 which faces the N pole and the N pole of the other second magnet 32 of the moving spring 21 The S pole of one of the first magnets 31 of the moving spring 21 is connected by the other yoke clip 41.

Thus, in the first group of the first magnet 31 and the second magnet 32 to which the yoke clip 41 is connected, a main magnetic flux is formed, and under the action of the magnetic flux 51 and the magnetic line 52 of the main magnetic flux, the left hand is fixed. Then, magnetic forces F21 and F22 are generated between the contacts. When an arc is generated between the moving and stationary contacts, the arc is elongated in the direction of the magnetic forces F21 and F22 by the magnetic force to extinguish the arc. Similarly, when energized, the moving reed 21 flows through the current I, and the left reed 21 is subjected to an upward ampere force F31 under the action of the magnetic field to resist the electric repulsion F11 between the moving and stationary contacts. , F12, the contact pressure is increased, so that the contacts are in reliable contact. Another important significance of the present invention is that when the contact circuit generates a faulty large current (such as 4KA, 6KA, etc.), the amperage force is consistent with the contact pressure direction, which can greatly increase the contact pressure. Therefore, the electric repulsion of the contact is effectively resisted, so that the contact is reliably contacted, and the unsafe consequences such as contact ablation are avoided by the contact opening.

There will be magnetic flux leakage between the two first magnetic steels 31. Under the action of the magnetic flux lines 53 of the magnetic flux leakage, the left hand is fixed, and the arc force caused by the magnetic flux leakage and the arc caused by the main magnetic flux are affected by the magnetic flux. The effect of the force direction is uniform; likewise, there is also a magnetic flux leakage between the two second magnetic steels 32. Under the action of the magnetic flux line 54 of the magnetic flux leakage, the left hand rule is also applied to the moving spring 21 An upward ampere force is generated which is also consistent with the direction of the ampere force F31 produced by the main magnetic flux, that is, the magnetic flux leakage of the magnetic steel scheme of the present invention is advantageous for the purpose to be achieved.

The invention realizes the dual function of simultaneously generating arc extinguishing and increasing contact pressure by the same magnetic field scheme. That is, the first magnetic steel is also involved in providing an ampoule force to the moving spring, and the second magnetic steel is also involved in the arc extinguishing effect, so that the magnetic utilization rate of the magnetic steel is greatly improved.

Embodiment 3

Referring to FIG. 6, the arc-extinguishing magnetic circuit of the magnetic steel misalignment distribution of the present invention and the DC relay thereof are different from the first embodiment in that the two second magnetic steels 32 are respectively disposed opposite to each other. The positions where the stationary contacts 11, 12 are in contact with the movable spring 21, that is, the two second magnetic steels 32 are respectively distributed at positions corresponding to the contact of the moving and stationary contacts. In this way, the second magnetic steel 32 is closer to the corresponding first magnetic steel 31, and the second magnetic steel 32 faces the contact, so that the magnetic field strength of the arc extinguishing magnetic field and the urging spring providing the ampere force can be enhanced.

Embodiment 4

Referring to FIG. 7, an arc-extinguishing magnetic circuit of a magnetic steel misalignment distribution and a DC relay thereof according to the present invention are different from the second embodiment in that the two second magnetic steels 32 are respectively disposed opposite to each other. The positions where the stationary contacts 11, 12 are in contact with the movable spring 21, that is, the two second magnetic steels 32 are respectively distributed at positions corresponding to the contact of the moving and stationary contacts.

Embodiment 5

Referring to FIG. 8 to FIG. 10, a quenching magnetic circuit of a magnetic steel misalignment distribution and a DC relay thereof according to the present invention are different from the second embodiment in that the two second magnetic steels 32 are The N pole of a second magnet 32 faces the moving reed, and the second magnet 32 of the N pole facing the moving reed is disposed on the left side of the current flowing to the moving reed 21 to generate the magnetic field of the four magnets. The ampere force matches the electric repulsion between the moving and stationary contacts, increasing the separation force between the moving and stationary contacts.

Since the position of the two second magnets 32 changes, when energized, the moving reed 21 flows through the current I, and the left reed is forced to a downward ampere force F32 under the action of the magnetic field. The force F32 is opposite to the pressure F51 between the moving and stationary contacts.

As shown in Figure 10, a fuse is connected in series with the relay in the system. When the system abnormally generates a large fault current (such as 4KA, 6KA), the Ampere formula F=B•I•L (B, L unchanged) It can be seen that the current becomes larger, and the moving spring is subjected to an ampere force opposite to the contact pressure, thereby resisting the contact pressure together with the electric repulsion of the contact, so that the dynamic and static contacts are quickly separated to achieve the purpose of cutting off the abnormal current in the circuit.

Under normal load, because the system current is small (basically hundreds of amps), the Ampere F32 is small, and has no effect on the moving reed, so it does not affect the normal performance of the relay.

In summary, the present invention distributes four magnetic steels around the moving and stationary contacts, and displaces the two second magnetic steels so that the two second magnetic steels are closer to the two corresponding first counterparts. Magnetic steel to enhance the strength of the magnetic field formed between two adjacent magnets. The magnetic field formed between two adjacent magnets can be used both for arc extinguishing and for providing ampere force to the moving spring. . Further, the yoke clip is added between the adjacent two magnets. Since the magnetic resistance of the yoke clip is much smaller than the air reluctance, the magnetic flux of the magnet is mainly pulled toward the yoke to form a main magnetic flux. The leakage flux between the two adjacent magnetic steels becomes the main magnetic flux, so that the intensity of the arc-extinguishing magnetic field and the magnetic field strength of the urging spring are greatly enhanced, and four magnetic steels are formed. The magnetic field simultaneously produces the dual function of arc extinguishing and increasing (or reducing) contact pressure. At the same time, the leakage force generated by the leakage flux between the two second magnetic steels is the same as the amperage force generated by the main magnetic flux to the moving spring, and the magnetic flux leakage between the two first magnetic steels The magnetic blowing direction generated by the arc is also consistent with the magnetic blowing direction generated by the main magnetic flux. When a large current flows through the moving reed, the moving reed is subjected to the upward (or downward) ampere force generated by the magnetic field of the four magnetic steels to resist (or match) the electric repulsion between the moving and stationary contacts. Thereby the moving spring is in close contact with the leading end (or quickly separated). When an arc is generated between the moving and stationary contacts, the main magnetic flux generated by the four magnetic steels through the yoke clamp generates a magnetic blow to the arc, so that the arc is quickly extinguished. The polarity of the two second magnetic steels has special requirements. When used to increase the pressure between the moving and moving contacts, one of the two second magnetic steels, the N pole of the second magnetic steel faces the moving reed The second magnetic steel with the N pole facing the moving reed is disposed on the right side of the current flowing to the moving spring; when used to increase the separating force between the moving and static contacts, the quick breaking and the static contact are realized. Among the two second magnetic steels, the N pole of one of the second magnetic steels faces the moving reed, and the second magnetic steel whose N pole faces the moving reed is disposed on the left side of the current flowing of the moving reed.

The above is only the preferred embodiment of the present invention, and thus the scope of the present invention is not limited thereto, and equivalent changes and modifications made in accordance with the scope of the present invention and the contents of the specification should still be covered by the present invention. In the range.

Industrial applicability

The invention distributes four magnetic steels around the movable and static contacts, and distributes the two second magnetic steels in a dislocation manner, so that the two second magnetic steels are closer to the two first magnetic steels respectively corresponding to the corresponding phases, and further A yoke clamp is added between two adjacent magnets. The magnet and the yoke clamp can be mounted on the components around the moving and stationary contacts, such as a relay housing or a relay base or a relay coil holder. A mounting groove is provided on the outer casing or the relay base or the relay coil frame for mounting the magnetic steel and the yoke clamp, and a bracket is arranged around the movable and static contacts to install the magnetic steel and the yoke clamp, and the magnetic pole of the magnetic steel is The present invention is industrially easy to implement in the desired direction, and the magnetic steel, the yoke clip, and the structure for mounting the magnetic steel and the yoke clip (such as a bracket or a mounting groove) are also industrially easy to process.

Claims

An arc extinguishing magnetic circuit of magnetic steel misalignment distribution, comprising a contact portion, wherein the contact portion comprises two static contacts for respectively supplying current and flowing out, and a moving spring piece, the two ends of the moving spring piece respectively Cooperating with two static contacts; a first magnetic steel is respectively disposed outside the two ends of the length of the moving spring; and is characterized in that: a second magnetic steel is respectively disposed outside the two sides of the width of the moving spring Wherein the polarity of the two first magnetic steels is opposite, and the polarities of the two second magnetic steels are also opposite in nature; the two second magnetic steels are misaligned, and the second magnetic steel of the misaligned distribution is adjacent The polarity of the first magnetic steel is set to be biased by the opposite polarity.
The arc extinguishing magnetic circuit according to claim 1, wherein the two second magnetic steels are respectively disposed at positions where the two stationary contacts are in contact with the movable spring.
The arc extinguishing magnetic circuit according to claim 1 or 2, wherein: further, the arc extinguishing magnetic circuit further comprises two yoke clips with magnetic conductive functions, and the two yoke iron clips are respectively connected to each other. Between the first magnetic steel and the second magnetic steel; the polarities of the corresponding first magnetic steel and the second magnetic steel facing the moving reed are mutually opposite.
The arc extinguishing magnetic circuit according to claim 1 or 2, wherein in the two second magnetic steels, one of the second magnetic steels has an N pole facing the moving reed, and the N pole faces the moving reed. The second magnetic steel is disposed on the right side of the current flowing of the moving reed to resist the electric repulsion between the moving and stationary contacts by utilizing the ampere force generated by the magnetic fields of the four magnetic steels, increasing the dynamic and static contacts pressure.
The arc extinguishing magnetic circuit according to claim 3, wherein in the two second magnetic steels, one of the second magnetic steels has an N pole facing the moving reed, and the N pole is opposite to the moving reed The magnetic steel is placed on the right side of the current flow of the moving reed to resist the electric repulsion between the moving and stationary contacts by using the ampere force generated by the magnetic field of the four magnetic steels, and the pressure between the moving and stationary contacts is increased. .
The arc extinguishing magnetic circuit according to claim 1 or 2, wherein in the two second magnetic steels, one of the second magnetic steels has an N pole facing the moving reed, and the N pole faces the moving reed. The second magnetic steel is disposed on the left side of the current flowing of the moving reed to match the electric repulsion between the moving and static contacts by using the ampere force generated by the magnetic fields of the four magnetic steels, and increases the dynamic and static contacts. Separation force.
The arc extinguishing magnetic circuit according to claim 3, wherein in the two second magnetic steels, one of the second magnetic steels has an N pole facing the moving reed, and the N pole is opposite to the moving reed The magnetic steel is placed on the left side of the current flowing to the moving reed to match the electric repulsion between the moving and stationary contacts by the ampere force generated by the magnetic field of the four magnetic steels, and the separation between the moving and stationary contacts is increased. force.
A direct current relay comprising the arc extinguishing magnetic circuit according to any one of claims 1 to 7.