CN219998120U - Contactor - Google Patents

Abstract

The utility model discloses a contactor. The contactor includes: an insulating case having an inner cavity constituting the arc extinguishing chamber; a pair of stationary terminals fixed to the insulating case and extending into the arc extinguishing chamber; a movable terminal disposed in the arc extinguishing chamber for bridging the pair of stationary terminals; the first magnetizer is arranged in the arc extinguishing chamber and is fixed relative to the insulating shell; and a second magnetizer assembled with the movable terminal to move in synchronization with the movable terminal; the pair of stationary terminals and the first magnetizer are disposed directly above the movable terminal, and the first and second magnetizers are opposite in the vertical direction. In the utility model, when the short-circuit current flows through the movable terminal and the static terminal, the first and the second magnetic conductors are magnetized by the magnetic field generated by the short-circuit current and generate electromagnetic attraction force which is attracted to each other, and the electromagnetic attraction force is applied to the movable terminal, so that the movable terminal and the static terminal cannot be sprung apart, and the short-circuit current resistance of the contactor is improved.

Description

Contactor

Technical Field

The present utility model relates to a contactor.

Background

In the prior art, when the coil of the contactor is electrified, the main contact of the contactor is in a closed state, so that the current can be effectively conducted and carried. When the coil of the contactor is in a power-off state, the main contact of the contactor is in an off state, and the effect of off current can be realized. When the high-voltage loop connected with the contactor works normally, the current carried by the main contact of the contactor is stable and normal. However, when the high-voltage loop has abnormal working conditions such as short circuit, the bearing capacity and stability of the main contact of the contactor are affected by abnormal current to some extent. The high-voltage direct-current contactor is a key device in many electrical equipment (such as a new energy automobile electrical system), and when surge current occurs between a moving contact and a fixed contact, the contactor can fail, causing unexpected serious consequences. Meanwhile, the future development trend of the new energy automobile is high voltage heavy current, when a high voltage system fails, surge current can reach 5kA or even more than 15kA, when the heavy current flows through a moving contact and a fixed contact, strong electric repulsive force (comprising Lorentz force and Hall force) can be generated in a main contact loop, the direction of the electric repulsive force is opposite to the contact direction of the moving contact and the fixed contact, the moving contact and the fixed contact can be sprung out, electric arcs are generated, and accordingly the contactor is invalid.

In the prior art, the current carrying capacity of the hvdc contactor is generally limited for short periods of high current withstand. The short-circuit current resistance is generally within 2500-5000A, and the technical requirements of future markets cannot be met.

Disclosure of Invention

The present utility model is directed to solving at least one of the above-mentioned problems and disadvantages of the prior art.

According to one aspect of the present utility model, a contactor is provided. The contactor includes: an insulating case having an inner cavity constituting the arc extinguishing chamber; a pair of stationary terminals fixed to the insulating case and extending into the arc extinguishing chamber; a movable terminal disposed in the arc extinguishing chamber for bridging the pair of stationary terminals; the first magnetizer is arranged in the arc extinguishing chamber and is fixed relative to the insulating shell; and a second magnetizer assembled with the movable terminal to move in synchronization with the movable terminal; the pair of stationary terminals and the first magnetizer are disposed directly above the movable terminal, and the first magnetizer and the second magnetizer are opposite in a vertical direction.

According to an exemplary embodiment of the present utility model, the contactor further includes: the insulating seat is arranged in the arc extinguishing chamber; a stopper fixed to the insulating base and movably connected to the second magnetizer; and the contact spring is compressed between the second magnetizer and the insulating seat and is used for applying electric contact force on the movable terminal, and the limiting frame and the insulating seat are injection molded into a whole by an embedded injection molding mode, wherein the limiting frame is an embedded part, and the insulating seat is an injection molded part.

According to another exemplary embodiment of the present utility model, the second magnetizer is U-shaped, including a pair of side walls and a bottom wall connected between bottoms of the pair of side walls; the second magnetizer has a mounting groove defined by the pair of side walls and the bottom wall, and the movable terminal is mounted in the mounting groove.

According to another exemplary embodiment of the present utility model, an engagement protrusion is formed on the top surface of the bottom wall of the second magnetizer, and an engagement groove is formed on the bottom surface of the movable terminal; the engagement projection on the second magnetizer is engaged with the engagement groove on the movable terminal.

According to another exemplary embodiment of the present utility model, guide grooves extending in a vertical direction are formed at both sides of the stopper, respectively, and side walls of the second magnetizer are slidably fitted in the guide grooves of the stopper such that the second magnetizer and the movable terminal can only move in a vertical direction with respect to the insulating base.

According to another exemplary embodiment of the present utility model, the limit stop includes: a pair of side plates; a bottom plate connected between bottoms of the pair of side plates and embedded in the insulating base; and a pair of limiting plates respectively connected to the tops of the pair of side plates, the guide grooves being formed on the side plates and passing upward through the limiting plates, the limiting plates being adapted to abut on the top surfaces of the movable terminals for limiting the maximum moving distance of the movable terminals in the vertical direction relative to the insulating base.

According to another exemplary embodiment of the present utility model, a positioning recess is formed on the bottom surface of the bottom wall of the second magnetizer, and a positioning groove is formed on the top surface of the insulating base; the upper end and the lower end of the contact spring are respectively positioned in the positioning concave part of the second magnetizer and the positioning groove of the insulating seat.

According to another exemplary embodiment of the present utility model, a portion of the bottom plate of the stopper is exposed via the positioning groove, and the lower end of the contact spring abuts against the bottom plate of the stopper.

According to another exemplary embodiment of the present utility model, the contactor further comprises: the metal shell is connected with the insulating shell into an integral piece through an embedded injection molding mode; and a magnetic conductive plate disposed in the bottom opening of the metal case and fixed to the metal case, a peripheral portion of the bottom opening of the metal case extending from the insulating case and being welded or riveted to the magnetic conductive plate.

According to another exemplary embodiment of the present utility model, the contactor further comprises: an insulating cover mounted into the bottom opening of the insulating case to cover the bottom opening of the insulating case, the insulating cover being supported and positioned on the top surface of the magnetic conductive plate, and the insulating seat being supported and positioned on the inner side of the insulating cover.

According to another exemplary embodiment of the present utility model, the contactor further comprises: two magnetic blowout magnets are respectively installed in the two accommodation grooves of the insulating case for extinguishing an arc between the stationary terminal and the movable terminal by a magnetic blowout manner.

According to another exemplary embodiment of the present utility model, a positioning step is formed in the receiving groove of the insulating case, the insulating cover has a support rib inserted into the receiving groove, the support rib is abutted against the bottom surface of the magnetic blowout magnet, and the positioning step is abutted against the top surface of the magnetic blowout magnet, so that the magnetic blowout magnet is fixed in the receiving groove.

According to another exemplary embodiment of the present utility model, the first magnetizer is fixed to the insulating shell; or the insulating cover has a support plate protruding into the arc extinguishing chamber, and the first magnetizer is fixed to the support plate of the insulating cover.

According to another exemplary embodiment of the present utility model, a tapered positioning protrusion is formed on the bottom surface of the insulating base, and a tapered positioning hole is formed on the insulating cover, the tapered positioning protrusion being engaged with the tapered positioning hole; the insulating cover is provided with a protruding column, the magnetic conduction plate is provided with a mounting hole, and the protruding column is matched with the mounting hole on the magnetic conduction plate.

According to another exemplary embodiment of the present utility model, the contactor further comprises: a driving shaft having an upper end passing through the magnetic conductive plate and the insulating cover and fixed into the insulating seat; a magnetic core, a lower end of the driving shaft being inserted into an axial through hole on the magnetic core and being connected to the magnetic core; and the reset spring is sleeved on the driving shaft and compressed between the magnetic conduction plate and the magnetic core, and the insulating seat electrically isolates the driving shaft from the limiting frame.

According to another exemplary embodiment of the present utility model, the limiting frame, the insulating seat and the driving shaft are injection molded as one piece by insert injection molding, wherein the limiting frame and the driving shaft are insert pieces and the insulating seat is an injection molded piece.

According to another exemplary embodiment of the present utility model, the contactor further comprises: the insulating bottom shell comprises an outer peripheral wall, a bottom wall and a top opening opposite to the bottom wall, and the bottom of the insulating shell is inserted into the top opening of the insulating bottom shell and is buckled with the insulating bottom shell.

According to another exemplary embodiment of the present utility model, the contactor further comprises: a yoke having a U-shape and disposed in the insulating bottom case; a coil bobbin disposed in the yoke; a coil wound around the outside of the bobbin; and a magnetic conductive bushing installed in the bobbin, a lower end of the magnetic conductive bushing being fixed to the yoke, the magnetic core being movably installed in the magnetic conductive bushing.

According to another exemplary embodiment of the present utility model, a positioning blind hole with an open bottom is formed on the protruding column of the insulating cover, and a positioning column matched with the positioning blind hole is formed on the top of the coil skeleton; an inserting tongue is formed at the top of the magnetic yoke, a slot is formed at the bottom of the insulating shell, and the inserting tongue penetrates through the magnetic conduction plate and the insulating cover and is inserted into the slot.

According to another exemplary embodiment of the present utility model, the insulating case has a partition wall formed on a top surface thereof, the partition wall isolating outer ends of the pair of static terminals exposed from the top surface of the insulating case to increase a creepage distance between the outer ends of the pair of static terminals.

In the foregoing respective exemplary embodiments according to the present utility model, when a short circuit current flows through the movable terminal and the stationary terminal, the first and second magnetic conductors are magnetized by a magnetic field generated by the short circuit current and generate electromagnetic attraction force that attracts each other, and the electromagnetic attraction force is applied to the movable terminal so that the movable terminal and the stationary terminal are not sprung apart, improving the short circuit current resistance of the contactor.

Other objects and advantages of the present utility model will become apparent from the following description of the utility model with reference to the accompanying drawings, which provide a thorough understanding of the present utility model.

Drawings

FIG. 1 shows an axial cross-section of a contactor according to an exemplary embodiment of the utility model;

fig. 2 shows an axial cross-section of the upper half of a contactor according to an exemplary embodiment of the utility model;

FIG. 3 shows an axial cross-section of the lower half of a contactor according to an exemplary embodiment of the utility model;

fig. 4 shows a schematic perspective view of a first magnetizer and a movable terminal assembly in a contactor according to an exemplary embodiment of the present utility model;

FIG. 5 shows an axial cross-sectional view of the first magnetizer and the movable terminal assembly in the contactor according to an exemplary embodiment of the present utility model;

FIG. 6 illustrates another axial cross-sectional view of the first magnetizer and the movable terminal assembly in the contactor according to an exemplary embodiment of the present utility model;

fig. 7 shows an axial cross-sectional view of a housing assembly in a contactor according to an exemplary embodiment of the utility model.

Detailed Description

The technical scheme of the utility model is further specifically described below through examples and with reference to the accompanying drawings. In the specification, the same or similar reference numerals denote the same or similar components. The following description of embodiments of the present utility model with reference to the accompanying drawings is intended to illustrate the general inventive concept and should not be taken as limiting the utility model.

Furthermore, in the following detailed description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of the embodiments of the present disclosure. It may be evident, however, that one or more embodiments may be practiced without these specific details. In other instances, well-known structures and devices are shown in the drawings in order to simplify the drawings.

According to one general technical concept of the present utility model, a contactor is provided. The contactor includes: an insulating case having an inner cavity constituting the arc extinguishing chamber; a pair of stationary terminals fixed to the insulating case and extending into the arc extinguishing chamber; a movable terminal disposed in the arc extinguishing chamber for bridging the pair of stationary terminals; the first magnetizer is arranged in the arc extinguishing chamber and is fixed relative to the insulating shell; and a second magnetizer assembled with the movable terminal to move in synchronization with the movable terminal; the pair of stationary terminals and the first magnetizer are disposed directly above the movable terminal, and the first magnetizer and the second magnetizer are opposite in a vertical direction.

FIG. 1 shows an axial cross-section of a contactor according to an exemplary embodiment of the utility model; fig. 2 shows an axial cross-section of the upper half of a contactor according to an exemplary embodiment of the utility model; fig. 3 shows an axial cross-section of the lower half of a contactor according to an exemplary embodiment of the utility model.

As shown in fig. 1 to 3, in one exemplary embodiment of the present utility model, a contactor is disclosed. The contactor includes: an insulating case 11, a pair of static terminals 13, a moving terminal 30, a first magnetizer 31, and a second magnetizer 32. The insulating case 11 has an inner cavity constituting the arc extinguishing chamber 101. A pair of static terminals 13 are fixed to the insulating case 11 and extend into the arc extinguishing chamber 101. The movable terminal 30 is provided in the arc extinguishing chamber 101 for bridging the pair of stationary terminals 13. The first magnetizer 31 is arranged in the arc-extinguishing chamber 101 and is stationary with respect to the insulating housing 11. The second magnetizer 32 is assembled with the movable terminal 30 to move in synchronization with the movable terminal 30.

As shown in fig. 1 to 3, in the illustrated embodiment, a pair of the stationary terminal 13 and the first magnetizer 31 are disposed directly above the movable terminal 30, and the first magnetizer 31 and the second magnetizer 32 are opposed in the vertical direction. Therefore, in the illustrated embodiment, when a short-circuit current flows through the movable terminal 30 and the stationary terminal 13, the first and second magnetic conductors 31 and 32 are magnetized by the magnetic field generated by the short-circuit current and generate electromagnetic attraction force that attracts each other, and the electromagnetic attraction force is applied to the movable terminal 30 so that the movable terminal 30 and the stationary terminal 13 are not sprung apart, improving the short-circuit current resistance of the contactor.

Fig. 4 shows a schematic perspective view of a first magnetizer 31 and a movable terminal assembly in a contactor according to an exemplary embodiment of the present utility model; fig. 5 shows an axial cross-section of the first magnetizer 31 and the movable terminal assembly in the contactor according to an exemplary embodiment of the present utility model; fig. 6 shows another axial cross-section of the first magnetizer 31 and the movable terminal assembly in the contactor according to an exemplary embodiment of the present utility model.

As shown in fig. 1 to 6, in the illustrated embodiment, the contactor further includes: an insulating base 34, a limit frame 33 and a contact spring 35. The insulating holder 34 is disposed in the arc extinguishing chamber 101. The stopper 33 is fixed to the insulating holder 34 and is movably connected with the second magnetizer 32. The contact spring 35 is compressed between the second magnetizer 32 and the insulator seat 34 for exerting an electrical contact force on the movable terminal 30.

As shown in fig. 1 to 6, in the illustrated embodiment, the limiting frame 33 and the insulating base 34 are molded into a single piece by insert molding, wherein the limiting frame 33 is an insert, and the insulating base 34 is a molded piece.

As shown in fig. 1-6, in the illustrated embodiment, the second magnetic conductor 32 is U-shaped, including a pair of side walls 321 and a bottom wall 322 connected between the bottoms of the pair of side walls 321. The second magnetizer 32 has a mounting groove defined by a pair of side walls 321 and a bottom wall 322, in which the movable terminal 30 is mounted.

As shown in fig. 1 to 6, in the illustrated embodiment, an engagement protrusion 32a is formed on the top surface of the bottom wall 322 of the second magnetizer 32, and an engagement groove 30a is formed on the bottom surface of the movable terminal 30. The engagement protrusion 32a on the second magnetizer 32 is engaged with the engagement groove 30a on the movable terminal 30.

As shown in fig. 1 to 6, in the illustrated embodiment, guide grooves 330 extending in the vertical direction are formed at both sides of the stopper 33, respectively, and the side walls 321 of the second magnetizer 32 are slidably fitted in the guide grooves 330 of the stopper 33 such that the second magnetizer 32 and the movable terminals 30 can only move in the vertical direction with respect to the insulating holder 34.

As shown in fig. 1 to 6, in the illustrated embodiment, the stopper 33 includes: a pair of side plates 331, a bottom plate 332, and a pair of stopper plates 333. The bottom plate 332 is connected between the bottoms of the pair of side plates 331 and is embedded in the insulating holder 34. A pair of stopper plates 333 are respectively connected to the top of the pair of side plates 331. The guide groove 330 is formed on the side plate 331 and upwardly passes through the limit plate 333. The stopper plate 333 is adapted to abut on the top surface of the movable terminal 30 for limiting the maximum moving distance of the movable terminal 30 in the vertical direction with respect to the insulating base 34.

As shown in fig. 1 to 6, in the illustrated embodiment, a positioning recess 32b is formed on the bottom surface of the bottom wall 322 of the second magnetizer 32, and a positioning groove 340 is formed on the top surface of the insulating base 34. The upper and lower ends of the contact spring 35 are positioned in the positioning recess 32b of the second magnetizer 32 and the positioning groove 340 of the insulating holder 34, respectively.

As shown in fig. 1 to 6, in the illustrated embodiment, a part of the bottom plate 332 of the stopper 33 is exposed via the positioning groove 340, and the lower end of the contact spring 35 abuts on the bottom plate 332 of the stopper 33.

Fig. 7 shows an axial cross-sectional view of a housing assembly in a contactor according to an exemplary embodiment of the utility model.

As shown in fig. 1 to 7, in the illustrated embodiment, the contactor further comprises a metal shell 12 and a magnetically permeable plate 2. The metal shell 12 and the insulating shell 11 are injection molded into one piece by insert injection molding, wherein the metal shell 12 is an insert, and the insulating shell 11 is an injection molded piece. The magnetic conductive plate 2 is disposed in the bottom opening of the metal case 12 and is fixed to the metal case 12. The bottom open peripheral portion 121 of the metal shell 12 extends from the insulating shell 11 and is welded or riveted to the magnetically permeable plate 2.

As shown in fig. 1 to 7, in the illustrated embodiment, the insulating case 11 includes a peripheral wall 11a and a top wall 11b enclosing the arc extinguishing chamber 101, and the metal case 12 is embedded in the peripheral wall 11a and the top wall 11b of the insulating case 11.

As shown in fig. 1 to 7, in the illustrated embodiment, the contactor further includes an insulating cover 15, and the insulating cover 15 is mounted into the bottom opening of the insulating housing 11 to cover the bottom opening of the insulating housing 11. The insulating cover 15 is supported and positioned on the top surface of the magnetic conductive plate 2, and the insulating seat 34 is supported and positioned on the inner side of the insulating cover 15.

As shown in fig. 1-7, in the illustrated embodiment, the contactor further includes two magnetic blow magnets 14. Two accommodation grooves 12c are formed in the peripheral wall 11a of the insulating housing 11. Two magnetic blowout magnets 14 are respectively installed in the two receiving grooves 12c of the insulating case 11 for extinguishing an arc between the static terminal 13 and the moving terminal 30 by a magnetic blowout manner.

As shown in fig. 1 to 7, in the illustrated embodiment, a positioning step 114 is formed in the receiving groove 12c of the insulating case 11, and the insulating cover 15 includes a cover plate 150 and two support ribs 151 connected to the cover plate 150. The support rib 151 is inserted into the receiving groove 12c and abuts on the bottom surface of the magnetic blowout magnet 14, and the positioning step 114 abuts on the top surface of the magnetic blowout magnet 14, so that the magnetic blowout magnet 14 is fixed in the receiving groove 12c.

As shown in fig. 1 to 7, in the illustrated embodiment, the first magnetizer 31 may be fixed to the insulating housing 11, or may be fixed to the insulating cover 15. For example, the insulating cover 15 may have a support plate (not shown) protruding into the arc extinguishing chamber 101, and the first magnetizer 31 may be fixed to the support plate of the insulating cover 15.

As shown in fig. 1 to 7, in the illustrated embodiment, a tapered positioning protrusion 342 is formed on the bottom surface of the insulating holder 34, a tapered positioning hole 15a is formed on the insulating cover 15, and the tapered positioning protrusion 342 cooperates with the tapered positioning hole 15a to position the insulating holder 34. A protruding post 152 is formed on the insulating cover 15, and a mounting hole is formed on the magnetic conductive plate 2, and the protruding post 152 cooperates with the mounting hole on the magnetic conductive plate 2 to position the insulating cover 15.

As shown in fig. 1 to 7, in the illustrated embodiment, the contactor further includes: a drive shaft 36, a magnetic core 38, and a return spring 37. The upper end 361 of the drive shaft 36 passes through the magnetically permeable plate 2 and the insulating cover 15 and is secured into the insulating mount 34. The lower end of the drive shaft 36 is inserted into an axial through hole in the magnetic core 38 and is connected to the magnetic core 38. The return spring 37 is fitted over the drive shaft 36 and compressed between the magnetic conductive plate 2 and the magnetic core 38.

As shown in fig. 1 to 7, in the illustrated embodiment, the stopper 33, the insulating seat 34, and the driving shaft 36 are injection molded as one piece by insert injection molding, wherein the stopper 33 and the driving shaft 36 are insert pieces, and the insulating seat 34 is an injection molded piece. In the illustrated embodiment, in order to enhance the coupling strength between the driving shaft 36 and the insulating holder 34, a partial protrusion 341 is formed on the insulating holder 34, and an upper end 361 of the driving shaft 36 is coupled into the partial protrusion 341 of the insulating holder 34. In the illustrated embodiment, the drive shaft 36 and the stop 33 are electrically isolated by the insulating mount 34.

As shown in fig. 1 to 7, in the illustrated embodiment, the contactor further includes an insulating bottom case 5, and the insulating bottom case 5 includes an outer peripheral wall 5a and a bottom wall 5b and a top opening opposite to the bottom wall 5 b. The bottom of the insulating case 11 is inserted into the top opening of the insulating bottom case 5 and snapped together with the insulating bottom case 5. For example, in the illustrated embodiment, a catching groove 512 is formed on the peripheral portion of the top opening of the insulating bottom case 5, and a protrusion 112 is formed on the outer side of the peripheral portion of the bottom opening of the insulating case 11. The protrusions 112 on the insulating housing 11 engage with the catching grooves 512 on the insulating bottom housing 5 to assemble the insulating housing 11 with the insulating bottom housing 5. In the illustrated embodiment, a connection lug 51 is formed on the outer side of the outer peripheral wall 5a of the insulating bottom case 5, the connection lug 51 being for fixing to a mounting panel (not illustrated) of an electrical apparatus.

As shown in fig. 1 to 7, in the illustrated embodiment, the contactor further includes: yoke 42, bobbin 41, coil 40, and magnetically permeable bushing 43. The yoke 42 is U-shaped and is disposed in the insulating bottom case 5. The bobbin 41 is provided in the yoke 42. The coil 40 is wound outside the coil bobbin 41. The magnetically permeable bushing 43 is mounted in the coil bobbin 41. The lower end of the magnetically permeable bushing 43 is fixed to the yoke 42, and the magnetic core 38 is movably mounted in the magnetically permeable bushing 43. In the illustrated embodiment, the core 38, yoke 42, magnetically permeable liner 43 and magnetically permeable plate 2 form the magnetically permeable path of the contactor.

As shown in fig. 1 to 7, in the illustrated embodiment, the yoke 42 includes a pair of side plates 42a and a bottom plate 42b. An upwardly extending tongue 402 is formed on top of the side plate 42a of the yoke 42. One insertion tongue 402 is formed on each side of each side plate 42a of the yoke 42 in the width direction. A slot 102 is formed at each of four corners of the bottom surface of the insulating case 11. The insert tongue 402 on the yoke 42 passes through the magnetically permeable plate 2 and the insulating cover 15 and is inserted into the insert slot 102 on the insulating housing 11 to fix the insulating housing 11 and the yoke 42 together.

As shown in fig. 1 to 7, in the illustrated embodiment, a positioning blind hole 152a having an open bottom is formed on the protruding post 152 of the insulating cover 15, and a positioning post 41a that mates with the positioning blind hole 152a is formed on the top of the coil bobbin 41.

As shown in fig. 1 to 7, in the illustrated embodiment, the insulating housing 11 has a partition wall 111 formed on a top surface thereof, the partition wall 111 isolating outer ends of the pair of static terminals 13 exposed from the top surface of the insulating housing 11 to increase a creepage distance between the outer ends of the pair of static terminals 13.

As shown in fig. 1 to 7, in the illustrated embodiment, when the coil 40 is energized, the coil 40 generates a magnetic field, and the magnetic core 38 and the drive shaft 36 move upward against the return spring 37 under the influence of electromagnetic force, driving the magnetic core 38 into contact with the magnetically permeable plate 2, while driving the movable terminal 30 into a closed position in contact with the pair of stationary terminals 13, causing the contact springs 35 to be compressed, providing a contact pressure. When the coil 40 is deenergized, the magnetic field is removed, and the magnetic core 38 and the drive shaft 36 are moved downward by the elastic restoring force of the restoring spring 37 to restore the movable terminal 30 to the open position separated from the pair of stationary terminals 13.

It will be appreciated by those skilled in the art that the above-described embodiments are exemplary and that modifications may be made to the embodiments described in various embodiments without structural or conceptual aspects and that these variations may be resorted to without departing from the scope of the utility model.

Although the present utility model has been described with reference to the accompanying drawings, the examples disclosed in the drawings are intended to illustrate preferred embodiments of the utility model and are not to be construed as limiting the utility model.

Although a few embodiments of the present general inventive concept have been shown and described, it would be appreciated by those skilled in the art that changes may be made in these embodiments without departing from the principles and spirit of the general inventive concept, the scope of which is defined in the claims and their equivalents.

It should be noted that the word "comprising" does not exclude other elements or steps, and that the word "a" or "an" does not exclude a plurality. In addition, any element numbers of the claims should not be construed as limiting the scope of the utility model.

Claims (20)

1. A contactor, comprising:

an insulating case (11) having an inner cavity constituting an arc extinguishing chamber (101);

-a pair of static terminals (13) fixed to said insulating shell (11) and projecting into said arc extinguishing chamber (101);

a movable terminal (30) provided in the arc extinguishing chamber (101) for bridging the pair of stationary terminals (13);

a first magnetic conductor (31) which is arranged in the arc extinguishing chamber (101) and is fixed relative to the insulating shell (11); and

a second magnetizer (32) assembled with the movable terminal (30) to move synchronously with the movable terminal (30);

the pair of static terminals (13) and the first magnetizer (31) are disposed directly above the movable terminal (30), and the first magnetizer (31) and the second magnetizer (32) are opposite in the vertical direction.

2. The contactor according to claim 1, further comprising:

an insulating base (34) provided in the arc extinguishing chamber (101);

a stopper (33) fixed to the insulating base (34) and movably connected to the second magnetizer (32); and

a contact spring (35) compressed between the second magnetizer (32) and the insulating seat (34) for exerting an electrical contact force on the movable terminal (30),

the limiting frame (33) and the insulating seat (34) are molded into an integral piece in an embedded injection molding mode, wherein the limiting frame (33) is an embedded piece, and the insulating seat (34) is an injection molded piece.

3. The contactor according to claim 2, wherein:

the second magnetizer (32) is U-shaped and comprises a pair of side walls (321) and a bottom wall (322) connected between the bottoms of the side walls (321);

the second magnetizer (32) has a mounting groove defined by the pair of side walls (321) and the bottom wall (322), in which the movable terminal (30) is mounted.

4. A contactor according to claim 3, wherein:

an engagement protrusion (32 a) is formed on the top surface of the bottom wall (322) of the second magnetic conductor (32), and an engagement groove (30 a) is formed on the bottom surface of the movable terminal (30);

an engagement protrusion (32 a) on the second magnetizer (32) is engaged with an engagement groove (30 a) on the movable terminal (30).

5. A contactor according to claim 3, wherein:

guide grooves (330) extending in the vertical direction are formed on both sides of the limit frame (33), respectively, and side walls (321) of the second magnetizer (32) are slidably fitted in the guide grooves (330) of the limit frame (33), so that the second magnetizer (32) and the movable terminals (30) can only move in the vertical direction relative to the insulating base (34).

6. The contactor according to claim 5, wherein:

the limit frame (33) comprises:

a pair of side plates (331);

a bottom plate (332) connected between bottoms of the pair of side plates (331) and embedded in the insulating seat (34); and

a pair of limiting plates (333) respectively connected to the tops of the pair of side plates (331),

the guide groove (330) is formed on the side plate (331) and passes upwards through the limiting plate (333), and the limiting plate (333) is suitable for abutting on the top surface of the movable terminal (30) and is used for limiting the maximum moving distance of the movable terminal (30) relative to the insulating base (34) in the vertical direction.

7. The contactor according to claim 6, wherein:

a positioning concave part (32 b) is formed on the bottom surface of the bottom wall (322) of the second magnetizer (32), and a positioning groove (340) is formed on the top surface of the insulating seat (34);

the upper end and the lower end of the contact spring (35) are positioned in a positioning concave part (32 b) of the second magnetizer (32) and a positioning groove (340) of the insulating seat (34) respectively.

8. The contactor according to claim 7, wherein:

a part of the bottom plate (332) of the limiting frame (33) is exposed out through the positioning groove (340), and the lower end of the contact spring (35) is abutted against the bottom plate (332) of the limiting frame (33).

9. The contactor according to any one of claims 2 to 8, further comprising:

a metal shell (12) which is joined with the insulating shell (11) into an integral piece by means of insert injection molding; and

a magnetic conduction plate (2) disposed in a bottom opening of the metal shell (12) and fixed to the metal shell (12),

a peripheral portion (121) of the bottom opening of the metal shell (12) extends from the insulating shell (11) and is welded or riveted to the magnetic conductive plate (2).

10. The contactor according to claim 9, further comprising:

an insulating cover (15) fitted into the bottom opening of the insulating case (11) to cover the bottom opening of the insulating case (11),

the insulating cover (15) is supported and positioned on the top surface of the magnetic conductive plate (2), and the insulating seat (34) is supported and positioned on the inner side of the insulating cover (15).

11. The contactor according to claim 10, further comprising:

two magnetic blowout magnets (14) respectively installed in the two accommodation grooves (12 c) of the insulating case (11) for extinguishing an arc between the stationary terminal (13) and the movable terminal (30) by magnetic blowout.

12. The contactor according to claim 11, wherein:

a positioning step (114) is formed in a receiving groove (12 c) of the insulating case (11), the insulating cover (15) has a support rib (151) inserted into the receiving groove (12 c),

the support rib (151) abuts on the bottom surface of the magnetic blowout magnet (14), and the positioning step (114) abuts on the top surface of the magnetic blowout magnet (14), so that the magnetic blowout magnet (14) is fixed in the accommodation groove (12 c).

13. The contactor according to claim 10, wherein:

-the first magnetizer (31) is fixed to the insulating shell (11); or alternatively

The insulating cover (15) has a support plate that protrudes into the arc extinguishing chamber (101), and the first magnetic conductor (31) is fixed to the support plate of the insulating cover (15).

14. The contactor according to claim 10, wherein:

a conical positioning protrusion (342) is formed on the bottom surface of the insulating seat (34), a conical positioning hole (15 a) is formed on the insulating cover (15), and the conical positioning protrusion (342) is matched with the conical positioning hole (15 a);

a protruding column (152) is formed on the insulating cover (15), a mounting hole is formed on the magnetic conduction plate (2), and the protruding column (152) is matched with the mounting hole on the magnetic conduction plate (2).

15. The contactor according to claim 14, further comprising:

-a drive shaft (36) with an upper end (361) passing through the magnetic plate (2) and the insulating cover (15) and fixed in the insulating seat (34);

a magnetic core (38), the lower end of the drive shaft (36) being inserted into an axial through hole on the magnetic core (38) and connected to the magnetic core (38); and

a return spring (37) sleeved on the driving shaft (36) and compressed between the magnetic conduction plate (2) and the magnetic core (38),

the insulating seat (34) electrically isolates the drive shaft (36) from the limit frame (33).

16. The contactor according to claim 15, wherein:

the limiting frame (33), the insulating seat (34) and the driving shaft (36) are injection molded into an integral piece in an embedded injection molding mode, wherein the limiting frame (33) and the driving shaft (36) are embedded pieces, and the insulating seat (34) is an injection molded piece.

17. The contactor according to claim 15, further comprising:

an insulating bottom case (5) comprising an outer peripheral wall (5 a) and a bottom wall, a top opening opposite to the bottom wall,

the bottom of the insulating shell (11) is inserted into the top opening of the insulating bottom shell (5) and is buckled with the insulating bottom shell (5).

18. The contactor according to claim 17, further comprising:

a yoke (42) having a U-shape and disposed in the insulating bottom case (5);

a coil bobbin (41) provided in the yoke (42);

a coil (40) wound around the outside of the bobbin (41); and

a magnetic bushing (43) mounted in the bobbin (41),

the lower end of the magnetic conductive bushing (43) is fixed to the yoke (42), and the magnetic core (38) is movably mounted in the magnetic conductive bushing (43).

19. The contactor according to claim 18, wherein:

a positioning blind hole (152 a) with an open bottom is formed on the protruding column (152) of the insulating cover (15), and a positioning column (41 a) matched with the positioning blind hole (152 a) is formed on the top of the coil skeleton (41);

a plug tongue (402) is formed on the top of the magnetic yoke (42), a slot (102) is formed on the bottom of the insulating shell (11), and the plug tongue (402) passes through the magnetic conductive plate (2) and the insulating cover (15) and is inserted into the slot (102).

20. The contactor according to claim 1, wherein:

the insulating case (11) has a partition wall (111) formed on a top surface thereof, the partition wall (111) isolating outer ends of the pair of static terminals (13) exposed from the top surface of the insulating case (11) to increase a creepage distance between the outer ends of the pair of static terminals (13).