CN216145562U

CN216145562U - Contact system of contactor and contactor

Info

Publication number: CN216145562U
Application number: CN202121011919.2U
Authority: CN
Inventors: 陈宁; 谢强强; 罗雨
Original assignee: Shanghai Liangxin Electrical Co Ltd
Current assignee: Shanghai Liangxin Electrical Co Ltd
Priority date: 2021-05-12
Filing date: 2021-05-12
Publication date: 2022-03-29
Anticipated expiration: 2031-05-12

Abstract

A contactor contact system of a contactor comprises a fixed contact, a movable contact plate, an upper magnetizer and a lower magnetizer which are arranged on the upper side and the lower side of the movable contact plate and can form a magnetic conductive loop, and a bracket for supporting the movable contact plate and the lower magnetizer, wherein the bracket is fixedly arranged at the upper end of a transmission shaft, and the movable contact plate and the fixed contact can be driven to contact and separate to realize the on-off of the contactor in the up-and-down movement process of the transmission shaft. Through the improvement to magnetizer mounting structure, guaranteed that the contactor product passes through at the heavy current, even electronic repulsion is greater than the coil holding power, the contact ageing can not take place for the contactor contact yet, has reduced the clearance between the magnetizer about the contactor is under the closure state simultaneously to air gap magnetic resistance between the magnetizer has been weakened about, has improved the performance of high-voltage contactor product.

Description

Contact system of contactor and contactor

Technical Field

The utility model belongs to the technical field of low-voltage electrical appliances, and particularly relates to a contact system of a contactor and the contactor.

Background

The high-voltage direct-current contactor generally comprises a coil, an external magnetic circuit, an arc extinguish chamber, a fixed contact, a moving contact, a transmission assembly, a permanent magnet, a plastic shell and the like, and is mainly used in the fields of electric automobiles, charging piles, photovoltaics, energy storage and the like. The contact early-stage product generally adopts a mode that a contact system is sealed in a cavity filled with inert gases such as hydrogen or nitrogen, and the rapid arc extinction is realized through the magnetic blow of a permanent magnet. In the aspect of short-time tolerance (when short-time heavy current occurs in a system), magnetizers are basically arranged around a moving contact in the traditional product in the existing market, and when the heavy current passes through, the pressure of the contact is increased through the suction force generated between the upper magnetizer and the lower magnetizer, so that the electric repulsion is resisted, and the contact is prevented from being repelled. However, because the magnetizer in the existing product is relatively fixed with the push rod assembly (i.e. the upper magnetizer is held by the coil suction force), when the suction force between the magnetizers is larger than the coil holding force, as long as the electric repulsion force is also larger than the coil holding force, although the upper magnetizer and the lower magnetizer have enough suction force, the movable iron core is still pushed away, thereby driving the contacts to be separated. Therefore, the existing contactor product is easy to fail when a large current passes through; on the other hand, when the existing contactor product is closed, the gap between the upper magnetizer and the lower magnetizer must be larger than the overtravel of the moving contact, the air gap magnetic resistance of the gap can greatly weaken the suction force between the magnetizers, and the short-time tolerance resistance can also be weakened.

SUMMERY OF THE UTILITY MODEL

The utility model aims to overcome the defects that when a large circuit passes through the existing high-voltage contactor product, a movable iron core can be pushed open to drive a movable contact to move to cause contact failure and the air gap magnetic resistance between magnetizers can greatly weaken the suction force between the magnetizers.

Technical scheme

In order to realize the technical scheme, the contact system of the contactor comprises a fixed contact, a movable contact plate, an upper magnetizer and a lower magnetizer which are arranged on the upper side and the lower side of the movable contact plate and can form a magnetic conductive loop, and a bracket for supporting the movable contact plate and the lower magnetizer, wherein the bracket is fixedly arranged at the upper end of a transmission shaft, and the movable contact plate and the fixed contact can be driven to be contacted and separated to realize the on-off of the contactor in the up-and-down movement process of the transmission shaft.

Furthermore, the lower magnetizer is fixed in the inner frame of the bracket, the movable contact plate is tightly propped against the inner frame of the bracket by using the elastic element 8, and the movable contact plate and the lower magnetizer can move relatively.

Furthermore, the lower magnetizer is U-shaped, the movable contact plate is arranged between two side arms of the lower magnetizer, the movable contact plate is pressed by an elastic piece penetrating through a through hole on the bottom of the lower magnetizer, a movement gap exists between the movable contact plate and the inner bottom surface of the lower magnetizer, and the movement gap is not less than the distance that the transmission shaft continues to move upwards after the movable contact plate is contacted with the fixed contact.

Further, the two side arms of the lower magnetizer are provided with bosses, avoidance holes are formed in the positions, corresponding to the bosses, of the bracket, the bosses are located in the avoidance holes, and the upper surfaces of the bosses are not smaller than the upper surfaces of the bracket.

Furthermore, the elastic part is a contact spring, the upper end of the contact spring is pressed against the movable contact plate, and the lower end of the contact spring is pressed against the support or a spring support part rigidly connected with the support.

Further, the movable contact plate is positioned in the inner frame of the bracket and can move relative to the bracket in the moving direction of the transmission shaft.

Further, the static component is an arc extinguishing chamber bottom plate.

Furthermore, the lower magnetizer is in a U-shaped shape and is arranged along the width direction of the movable contact.

Furthermore, the support comprises a spring support piece arranged at the top of the upper end of the transmission shaft and a frame detachably arranged with the spring support piece, and the movable contact plate and the lower magnetizer are tensioned at the top end of the inner frame of the frame through an elastic piece.

Furthermore, the spring support comprises an injection molding body which is made of insulating materials and is fixedly arranged at the top of the upper end of the transmission shaft, and two connecting pieces which are embedded in the injection molding body, and each connecting piece is also provided with a connecting part exposed out of the injection molding body;

furthermore, the frame is of a U-shaped structure with an opening facing downwards, and two side walls of the frame are respectively provided with a clamping groove which is matched with the connecting part of the spring support member for installation.

The utility model also provides a contactor comprising the contact system.

Advantageous effects

The contact system of the contactor and the contactor provided by the utility model are provided with a pair of magnetizers, and when a product is electrified, a magnetic field generated by a main loop and a magnetic field generated by a permanent magnet enable an attraction force to be generated between the upper magnetizer and the lower magnetizer, so that the electric repulsion of the contact is resisted. The upper magnetizer is fixed on the independent fixing bracket, namely fixed with the product body, when the attraction force between the magnetizers is greater than the coil holding force, even if the electric repulsion force is greater than the coil holding force, because the upper magnetizer is fixed, the movable iron core can not be pushed away, the capability of the contact to resist the electric repulsion force is effectively increased, and until the electric repulsion force is greater than the attraction force between the upper magnetizer and the lower magnetizer, the lower magnetizer is repelled, so that the contact is separated; meanwhile, the fixed position of the upper magnetizer can be designed and confirmed as required, the lower magnetizer and the movable contact plate keep relative motion, the gap between the upper magnetizer and the lower magnetizer is small enough when the product is at the attraction position, the limitation that the gap between the upper magnetizer and the lower magnetizer must be larger than the overtravel in the traditional scheme is avoided, and the attraction force between the upper magnetizer and the lower magnetizer is greatly improved.

Drawings

FIG. 1a is a product drawing of a contactor according to an embodiment of the present invention.

FIG. 1b is a cross-sectional view taken along line U of FIG. 1.

FIG. 1c is a cross-sectional view taken along line V of FIG. 2.

Figure 2 is a perspective view of a contact system in an embodiment of the utility model.

Fig. 3 is a schematic diagram of the contact system in an embodiment of the utility model.

Fig. 4 is a product diagram of a lower magnetizer according to an embodiment of the present invention.

Fig. 5 is a product drawing of a stent in an embodiment of the present invention.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "inside", "outside", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted" and "connected" are to be interpreted broadly, e.g., as being either fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The present invention will be described in further detail below with reference to specific embodiments and with reference to the attached drawings.

Examples

As shown in fig. 1a,1b,1c,2 and 3, a contact system of a contactor includes a fixed contact 1 and a movable contact plate 2, an upper magnetizer 3 and a lower magnetizer 4 which are disposed on upper and lower sides of the movable contact plate 2 and can form a magnetic conductive loop, and a bracket 5 for supporting the movable contact plate 2 and the lower magnetizer 4, wherein the bracket 5 is fixedly mounted at an upper end of a transmission shaft 6, the transmission shaft 6 can drive the movable contact plate 2 to contact with and separate from the fixed contact 1 during the up-and-down movement process to realize the on-off of the contactor, and a fixed bracket 7 is mounted on a stationary part of the contactor, in this embodiment, the stationary part is preferably an arc extinguishing chamber bottom plate 10. The upper magnetizer 3 is fixedly installed on the fixed bracket 7, and the fixed bracket 7 is positioned at the outer side of the bracket 51.

Specifically, as shown in fig. 2 and 3, the lower magnetizer 4 is fixed in the inner frame of the bracket 5, the movable contact plate 2 is tightly abutted in the inner frame of the bracket 5 by using the elastic member 8, the movable contact plate 2 and the lower magnetizer 4 can move relatively, and the movable contact plate 2 is positioned in the inner frame of the bracket 5 and can move relatively to the bracket 5 in the moving direction of the transmission shaft 6. The elastic part 8 is a contact spring, the upper end of the contact spring is pressed against the movable contact plate 2, and the lower end of the contact spring is pressed against the support 5 or a spring support part 9 rigidly connected with the support 5.

The lower magnetizer 4 is U-shaped, and in this embodiment, the lower magnetizer 4 is U-shaped and is arranged along the width direction of the movable contact plate 2. The movable contact plate 2 is arranged between two side arms of the lower magnetizer 4, the movable contact plate 2 is pressed by an elastic part 8 (a contact spring is preferred in the embodiment) penetrating through a through hole 401 at the bottom of the lower magnetizer 4, a movement gap a exists between the movable contact plate 2 and the inner bottom surface of the lower magnetizer 4, and the movement gap a is not less than the distance of the upward movement of the transmission shaft 6 after the movable contact plate 2 is contacted with the fixed contact 1.

As shown in fig. 4, bosses 402 are disposed on two side arms of the lower magnetizer 4, as shown in fig. 5, avoidance holes 501 are disposed at positions on the bracket 5 corresponding to the bosses 402, the bosses 402 are located in the avoidance holes 501, and an upper surface of the bosses 402 is not smaller than an upper surface of the bracket 5, so that when a product is closed, the lower magnetizer 4 and the upper magnetizer 1 can be as close as possible on the premise of ensuring that the movable contact plate 2 and the fixed contact 1 are in full contact, thereby avoiding reducing a suction force between the upper magnetizer and the lower magnetizer due to air gap reluctance, and effectively improving a capability of the product for resisting short-circuit current;

further, in this embodiment as shown in fig. 1b and 1c, the bracket 5 includes a spring support 9 mounted on the top of the upper end of the transmission shaft 6, and a frame 11 detachably mounted with the spring support 9, and the movable touch plate 2 and the lower magnetizer 2 are tensioned on the top end of the inner frame of the frame 11 through an elastic member 8. The spring support 9 comprises an injection molding body 901 which is made of insulating materials and is fixedly installed at the top of the upper end of the transmission shaft 6, and two connecting pieces 902 which are embedded in the injection molding body 901, and each connecting piece 902 also has a connecting part 902a which is exposed out of the injection molding body 901; as shown in fig. 5, the frame 10 is a U-shaped structure with an opening facing downward, and two side walls of the frame 11 are respectively provided with a slot 1101 which is installed in cooperation with the connecting portion 902a of the spring support 9.

The utility model also provides a contactor, as shown in figure 1a, which comprises the contact system, when a transmission shaft 6 of the contactor moves upwards, the movable contact plate 2 is contacted with the fixed contact 1 to make the contact communicated, the lower magnetizer 4 is close to or contacted with the upper magnetizer 3, and a magnetic conductive ring is formed in the width direction of the movable contact plate 2; when a large current occurs, because the upper magnetizer 3 is fixed, the lower magnetizer 4 receives an attractive force in the direction of the contact pressure, so that the movable contact plate 2 can resist the electric repulsive force between the contacts and cannot be repelled.

The contact system of the contactor and the contactor provided by the embodiment of the utility model are provided with a pair of magnetizers, and when a product is electrified, a magnetic field generated by a main loop and a magnetic field generated by a permanent magnet enable an attraction force to be generated between the upper magnetizer and the lower magnetizer, so that the electric repulsion of the contact is resisted. The upper magnetizer is fixed on the independent fixing bracket, namely fixed with the product body, when the attraction force between the magnetizers is greater than the coil holding force, even if the electric repulsion force is greater than the coil holding force, because the upper magnetizer is fixed, the movable iron core can not be pushed away, the capability of the contact to resist the electric repulsion force is effectively increased, and until the electric repulsion force is greater than the attraction force between the upper magnetizer and the lower magnetizer, the lower magnetizer is repelled, so that the contact is separated; meanwhile, the fixed position of the upper magnetizer can be designed and confirmed as required, the lower magnetizer and the movable contact plate keep relative motion, the gap between the upper magnetizer and the lower magnetizer is small enough when the product is at the attraction position, the limitation that the gap between the upper magnetizer and the lower magnetizer must be larger than the overtravel in the traditional scheme is avoided, and the attraction force between the upper magnetizer and the lower magnetizer is greatly improved.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the utility model has been described in detail and with reference to the foregoing embodiments, those skilled in the art will appreciate that; the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A contact system of a contactor comprises a fixed contact (1), a movable contact plate (2), an upper magnetizer (3) and a lower magnetizer (4) which are arranged on the upper side and the lower side of the movable contact plate (2) and can form a magnetic conductive loop, and a bracket (5) for supporting the movable contact plate (2) and the lower magnetizer (4), wherein the bracket (5) is fixedly arranged at the upper end of a transmission shaft (6), and the transmission shaft (6) can drive the movable contact plate (2) to be in contact with and separated from the fixed contact (1) in the up-and-down movement process to realize the on-off of the contactor, and is characterized in that the fixed bracket (7) is arranged on a static part of the contactor, and the upper magnetizer (3) is fixedly arranged on the fixed bracket (7).

2. A contactor contact system as claimed in claim 1, wherein said lower magnetic conductor (4) is fixed in said frame (5), said movable contact plate (2) is held in said frame (5) by means of an elastic member (8), and said movable contact plate (2) and said lower magnetic conductor (4) are movable relative to each other.

3. The contact system of the contactor according to claim 2, wherein the lower magnetizer (4) is U-shaped, the movable contact plate (2) is arranged between two side arms of the lower magnetizer (4), the movable contact plate (2) is pressed by an elastic part (8) penetrating through a through hole (401) on the bottom of the lower magnetizer (4), a movement gap (a) exists between the movable contact plate (2) and the inner bottom surface of the lower magnetizer (4), and the movement gap (a) is not less than the distance of the upward movement of the transmission shaft (6) after the movable contact plate (2) is contacted with the fixed contact (1).

4. The contact system of the contactor according to claim 3, wherein the two side arms of the lower magnetizer (4) are provided with bosses (402), the support (5) is provided with avoidance holes (501) corresponding to the bosses (402), the bosses (402) are positioned in the avoidance holes (501), and the upper surface of the bosses (402) is not smaller than the upper surface of the support (5).

5. A contactor contact system as claimed in claim 2 or 3, wherein said resilient member (8) is a contact spring having an upper end abutting against said movable contact plate (2) and a lower end abutting against said support (5) or a spring support (9) rigidly connected to said support (5).

6. A contact system of a contactor according to claim 1, wherein said movable contact plate (2) is located in the inner frame of the frame (5) and is movable relative to the frame (5) in the direction of movement of said drive shaft (6).

7. A contact system of a contactor according to claim 1, characterized in that said stationary part is an arc chute base plate (10).

8. The contact system of a contactor according to claim 1, wherein said lower magnetizer (4) is U-shaped and arranged along the width direction of the movable contact plate (2).

9. The contact system of the contactor according to claim 1, wherein the bracket (5) comprises a spring support member (9) mounted on the top of the upper end of the transmission shaft (6), and a frame (11) detachably mounted with the spring support member (9), and the movable contact plate (2) and the lower magnetizer (4) are tensioned on the top end of an inner frame of the frame (11) through an elastic member (8).

10. A contact system of a contactor according to claim 9, wherein said spring support (9) comprises an injection molded body (901) made of insulating material and fixedly mounted on the top of the upper end of the transmission shaft (6), and two connecting members (902) embedded in said injection molded body (901), and each connecting member (902) further has a connecting portion (902a) exposed from said injection molded body (901).

11. A contact system of a contactor according to claim 9, wherein said frame (11) is a U-shaped structure with its opening facing downward, and two side walls of said frame (11) are respectively provided with a slot (1101) for fitting with the connecting portion (902a) of said spring support (9).

12. A contactor, characterized in that it comprises a contact system according to any one of the preceding claims 1 to 11.