CN214956514U - Direct current contactor quick arc extinguishing structure - Google Patents

Abstract

The utility model discloses a direct current contactor quick arc extinguishing structure, include: the movable contact assembly comprises a cavity, two fixed contacts, an auxiliary partition plate and a movable contact assembly, wherein the auxiliary partition plate is hermetically arranged at the bottom of the cavity, an arc extinguishing chamber is formed inside the cavity, the two fixed contacts are arranged on the cavity at intervals, and the bottom ends of the two fixed contacts extend into the arc extinguishing chamber; the movable contact assembly comprises a push rod and a movable contact piece located in the arc extinguishing chamber, a through hole is formed in the auxiliary partition plate, the top of the push rod penetrates through the through hole and is connected with the movable contact piece, a sealing plate is arranged above the through hole, and when the push rod drives the movable contact piece to move downwards, the sealing plate seals and blocks the through hole. The utility model relates to a direct current contactor quick arc extinguishing structure can be airtight with the arc extinguishing cavity when movable contact spring and static contact disconnection for electric arc extinguishes fast, reduction in production cost.

Description

Direct current contactor quick arc extinguishing structure

Technical Field

The utility model relates to a direct current contactor technical field, in particular to direct current contactor quick arc extinguishing structure.

Background

The direct current contactor is an electromagnetic switch for controlling the on-off of a large current through the on-off of a small current, and is mainly used in the fields of electric automobiles, charging piles, photovoltaics, energy storage and the like. The working principle is as follows: when the coil of the contactor is electrified, the coil generates a magnetic field to drive the movable iron core to move upwards, the movable iron core drives the movable contact piece to move upwards synchronously through the push rod, and the movable contact piece is contacted with the static contact to realize conduction, so that the aim of controlling large current by small current is fulfilled.

When the contactor is disconnected, the contactor is generally disconnected in a live state, at the moment, because voltage exists between the fixed contact and the movable contact, electric arcs can be generated at the moment that the movable contact and the fixed contact are pulled apart, the electric arcs have fatal damage to the performance of the contactor, and the contactor can directly fail in severe cases, so that corresponding functions cannot be completed. Therefore, rapid arc extinction is a key factor in the performance of the contactor.

At present, contactors are divided into two types, one type is a closed contactor, and the purpose of quickly extinguishing arcs is achieved by filling gas for enhancing arc extinguishing in a closed arc extinguishing chamber, but the closed contactor is high in manufacturing cost and complex in processing technology. The other type is an open type contactor, which has the advantages of simple process and low manufacturing cost compared with a closed type contactor, but because the tightness is poor, the arc extinguishing chamber is not filled with gas for enhancing arc extinguishing, and the pressure inside the cavity is the same as the atmospheric pressure, the arc extinguishing cannot be carried out quickly, and only the arc discharge distance can be increased to achieve the purpose of arc extinguishing, so that the power consumption of the contactor is increased and the volume of the contactor is increased.

Disclosure of Invention

In order to solve the technical problem, the utility model provides a direct current contactor quick arc extinguishing structure can be airtight with the arc extinguishing cavity when movable contact spring and static contact disconnection, and then strengthens the arc extinguishing performance of contactor.

The utility model discloses a solve the technical scheme that its technical problem adopted and be: a direct current contactor quick arc extinguishing structure includes: the movable contact assembly comprises a cavity, two fixed contacts, an auxiliary partition plate and a movable contact assembly, wherein the auxiliary partition plate is hermetically arranged at the bottom of the cavity, an arc extinguishing chamber is formed inside the cavity, the two fixed contacts are arranged on the cavity at intervals, and the bottom ends of the two fixed contacts extend into the arc extinguishing chamber; the movable contact assembly comprises a push rod and a movable contact piece located in the arc extinguishing chamber, a through hole is formed in the auxiliary partition plate, the top of the push rod penetrates through the through hole and is connected with the movable contact piece, a sealing plate is arranged above the through hole, and when the push rod drives the movable contact piece to move downwards, the sealing plate seals and blocks the through hole.

As a further improvement, the auxiliary partition board is located the downward concave yield in the through-hole outside forms the aqueduct, it centers on to cross the aqueduct the through-hole be provided with the sealed boss that the closing plate cooperation was used.

As a further improvement of the utility model, the sealing plate and a sealing gasket is arranged between the sealing bosses.

As a further improvement, the movable contact subassembly is still including being located the support in the cavity, support fixed mounting is in the push rod top, movable contact spring movable mounting be in on the support and with two the static contact is just right.

As a further improvement, the spacing slide opening has all been seted up on the relative both sides wall of support, the both sides of movable contact spring correspond respectively spacing slide opening department is provided with spacing lug, two spacing lug slides and arranges in and corresponds in the spacing slide opening.

As a further improvement of the utility model, the movable contact spring bottom with install the spring between the support, the spring is right the movable contact spring has ascending elasticity all the time.

As a further improvement, the auxiliary partition board corresponds to the outside of support is provided with the limiting plate, the limiting plate is provided with spacing rib along the inner wall.

The utility model has the advantages that: the utility model provides a direct current contactor quick arc extinguishing structure, through being provided with the closing plate on the push rod, when the movable contact spring separates from the static contact, the through-hole sealing on the auxiliary separation board is stopped up to the closing plate, and then becomes the arc extinguishing cavity airtight state, and electric arc produces a large amount of heats, leads to the inside pressure increase of airtight arc extinguishing cavity, and electric arc voltage risees under the high pressure condition for electric arc extinguishes fast, effectively prevents the emergence of electric arc secondary restriking phenomenon, reduction in production cost; simultaneously, not only can increase intensity through being provided with the aqueduct on supplementary baffle, reduce the damage that the striking caused, can increase the stroke length of push rod moreover, under the condition of not increasing contactor volume, realize that the increase draws the arc space, reach the purpose of quick arc extinguishing.

Drawings

Fig. 1 is a schematic cross-sectional view of the present invention;

FIG. 2 is an enlarged schematic view of A of FIG. 1 according to the present invention;

FIG. 3 is a schematic perspective view of the movable contact assembly and the auxiliary partition plate of the present invention;

FIG. 4 is a schematic perspective view of the auxiliary partition plate of the present invention;

FIG. 5 is a schematic cross-sectional view of the auxiliary partition of the present invention;

fig. 6 is a schematic perspective view of the push rod of the present invention.

The following description is made with reference to the accompanying drawings:

1-a cavity; 101-arc extinguishing chamber;

2-static contact; 3-auxiliary baffle plate;

301-through hole; 302-transition groove;

303-sealing boss; 304-limiting plate;

3041-spacing ribs; 4-push rod;

401-sealing plate; 5-moving contact piece;

501-limit lug; 6-the bracket;

601-limiting slide hole; 7-spring.

Detailed Description

The following description of the preferred embodiments of the present invention will be made in conjunction with the accompanying drawings.

Referring to fig. 1 to 6, the utility model provides a direct current contactor quick arc extinguishing structure, include: the device comprises a cavity 1, two static contacts 2, an auxiliary partition plate 3 and a movable contact assembly, wherein the auxiliary partition plate 3 is hermetically installed at the bottom of the cavity 1, an arc extinguishing chamber 101 is formed inside the cavity 1, the two static contacts 2 are installed on the cavity 1 at intervals, and the bottom ends of the two static contacts extend into the arc extinguishing chamber 101. The movable contact component comprises a push rod 4, a movable contact piece 5 and a support 6, wherein the movable contact piece 5 and the support 6 are located in the arc extinguishing chamber 101, contacts are arranged on the tops of two ends of the movable contact piece 5, and the two contacts are respectively opposite to the two static contacts 2. The auxiliary clapboard 3 is provided with a through hole 301, the top of the push rod 4 penetrates through the through hole 301 and is connected with the movable contact piece 5 through the bracket 6. The push rod 4 is provided with a sealing plate 401 above the through hole 301, and the sealing plate 401 is an annular table formed by extending the push rod 4 outwards along the outer circumference. When the push rod 4 drives the movable contact 5 to move downwards, the sealing plate 401 moves downwards and seals and blocks the through hole 301, and then the arc extinguishing chamber 101 is changed into a closed state, electric arc can be generated when the movable contact 5 is separated from the static contact 2, a large amount of heat is generated by the electric arc, air in the closed arc extinguishing chamber 101 is subjected to thermal expansion, the internal pressure of the arc extinguishing chamber 101 can be increased, the electric arc voltage is increased under the high-voltage condition, the electric arc is rapidly extinguished, and the phenomenon of secondary reignition of the electric arc is effectively prevented.

Referring to fig. 2, 4 and 5, the auxiliary partition plate 3 is located outside the through hole 301 and is recessed downwards to form a transition groove 302, and the transition groove 302 is arranged to increase the strength of the auxiliary partition plate 3 at the position and reduce the damage caused by the impact at the position. And the diameter of the transition groove 302 is larger than that of the sealing plate 401, when the push rod 4 moves downwards, the sealing plate 401 moves downwards into the transition groove 302, the stroke length of the push rod 4 can be increased, and under the condition that the size of the contactor is not increased, the arc discharge space is enlarged, and the purpose of quickly extinguishing the arc is achieved. The transition groove 302 is provided with a sealing boss 303 used in cooperation with the sealing plate 401 around the through hole 301, and the lower surface of the sealing plate 401 is attached to the upper surface of the sealing boss 303, so that the arc extinguishing chamber 101 is sealed.

A sealing gasket, not shown in the figure, may be further installed between the sealing plate 401 and the sealing boss 303, and the sealing gasket may be a high temperature resistant soft rubber material, such as silica gel, which can further increase the airtight effect of the arc extinguishing chamber 101.

Referring to fig. 1 and 3, the bracket 6 is fixedly installed on the top of the push rod 4, and the movable contact 5 is movably installed on the bracket 6. The support 6 is provided with two opposite side walls, the two side walls are provided with limiting sliding holes 601, the movable contact piece 5 is located between the two side walls, two sides of the movable contact piece 5 respectively extend outwards corresponding to the limiting sliding holes 601 to form two limiting convex blocks 501, the length of each limiting convex block 501 is matched with the length of the corresponding limiting sliding hole 601, and the two limiting convex blocks 501 are slidably arranged in the corresponding limiting sliding holes 601. A spring 7 is arranged between the bottom of the movable contact piece 5 and the bracket 6, and the spring 7 always has upward elastic force to the movable contact piece 5. Under the action of the elastic force of the spring 7 and the matching use of the limiting lug 501 and the limiting slide hole 601, the movable contact piece 5 can realize self-balancing, the left end and the right end of the movable contact piece 5 can be synchronized when being connected with or disconnected from two static contacts 2, the arc discharge is reduced, and the phenomenon that one end is obliquely adhered is avoided.

Referring to fig. 3 and 4, the auxiliary partition 3 is provided with a limiting plate 304 around the outer side corresponding to the support 6, the limiting plate 304 is provided with a limiting rib 3041 along the inner wall, and the support 6 can be limited from rotating under the positioning of the limiting ribs 3041 at the two sides, so as to prevent the moving contact 5 from rotating and being misaligned with the static contact 2.

The working principle of the embodiment is as follows: after a coil of the direct current contactor is electrified, a movable iron core fixed at the bottom end of a push rod 4 moves upwards under the action of electromagnetic force, the push rod 4 drives a movable contact 5 to move upwards through a bracket 6 and a spring 7 until the movable contact is contacted and closed with a static contact 2, and current is conducted; after the coil is powered off, the electromagnetic force disappears, the movable iron core is released under the action of the reset spring and moves downwards, the push rod 4 drives the movable contact piece 5 to move downwards through the support 6 and the spring 7, the sealing plate 401 moves downwards and seals and blocks the through hole 301, the arc extinguishing chamber 101 is changed into a closed state, when the static contact 2 and the movable contact piece 5 are separated, electric arc can be generated between the static contact and the movable contact under the action of voltage, and the heat generated by the electric arc enables the interior of the arc extinguishing chamber 101 to be in a high-voltage state, so that the electric arc is extinguished quickly.

Therefore, the utility model relates to a direct current contactor quick arc extinguishing structure, through being provided with the closing plate on the push rod, when the movable contact spring separates from the static contact, the through-hole on the auxiliary baffle is sealed up by the closing plate, and then becomes the arc extinguishing chamber airtight state, and electric arc produces a large amount of heats, leads to the inside pressure increase of airtight arc extinguishing chamber, and electric arc voltage risees under the high pressure condition for electric arc extinguishes fast, effectively prevents the emergence of electric arc secondary restriking phenomenon, reduction in production cost; simultaneously, not only can increase intensity through being provided with the aqueduct on supplementary baffle, reduce the damage that the striking caused, can increase the stroke length of push rod moreover, under the condition of not increasing contactor volume, realize that the increase draws the arc space, reach the purpose of quick arc extinguishing.

In the previous description, numerous specific details were set forth in order to provide a thorough understanding of the invention. The foregoing description is only illustrative of the preferred embodiments of the invention, which can be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. All the contents that do not depart from the technical solution of the present invention, any simple modification, equivalent change and modification made to the above embodiments according to the technical substance of the present invention all still belong to the protection scope of the technical solution of the present invention.

Claims (7)

1. The utility model provides a direct current contactor quick arc extinguishing structure which characterized in that includes: the device comprises a cavity (1), two fixed contacts (2), an auxiliary partition plate (3) and a movable contact assembly, wherein the auxiliary partition plate (3) is hermetically installed at the bottom of the cavity (1), an arc extinguishing chamber (101) is formed inside the cavity (1), the two fixed contacts (2) are installed on the cavity (1) at intervals, and the bottom ends of the two fixed contacts extend into the arc extinguishing chamber (101); the movable contact assembly comprises a push rod (4) and a movable contact piece (5) located in the arc extinguishing chamber (101), a through hole (301) is formed in the auxiliary partition plate (3), the top of the push rod (4) penetrates through the through hole (301) and is connected with the movable contact piece (5), a sealing plate (401) is arranged above the through hole (301), the push rod (4) drives the movable contact piece (5) to move downwards, and the sealing plate (401) seals and blocks the through hole (301).

2. The direct current contactor quick arc extinguishing structure according to claim 1, characterized in that: the auxiliary partition plate (3) is positioned outside the through hole (301) and is recessed downwards to form a transition groove (302), and a sealing boss (303) matched with the sealing plate (401) is arranged around the through hole (301) in the transition groove (302).

3. The direct current contactor quick arc extinguishing structure according to claim 2, characterized in that: and a sealing gasket is arranged between the sealing plate (401) and the sealing boss (303).

4. The direct current contactor quick arc extinguishing structure according to claim 1, characterized in that: the movable contact assembly further comprises a support (6) located in the cavity (1), the support (6) is fixedly installed at the top of the push rod (4), and the movable contact piece (5) is movably installed on the support (6) and is opposite to the two fixed contacts (2).

5. The direct current contactor quick arc extinguishing structure according to claim 4, characterized in that: the two opposite side walls of the support (6) are respectively provided with a limiting sliding hole (601), the two sides of the movable contact piece (5) are respectively provided with a limiting lug (501) corresponding to the limiting sliding holes (601), and the two limiting lugs (501) are slidably arranged in the corresponding limiting sliding holes (601).

6. The direct current contactor quick arc extinguishing structure according to claim 4, characterized in that: a spring (7) is arranged between the bottom of the movable contact piece (5) and the bracket (6), and the spring (7) always has upward elastic force on the movable contact piece (5).

7. The direct current contactor quick arc extinguishing structure according to claim 4, characterized in that: the auxiliary partition plate (3) is provided with a limiting plate (304) corresponding to the outer side of the support (6), and the limiting plate (304) is provided with a limiting rib (3041) along the inner wall.

Images