CN111508776A

CN111508776A - AC contactor

Info

Publication number: CN111508776A
Application number: CN202010175506.1A
Authority: CN
Inventors: 向国庆; 刘忠; 陈武奇
Original assignee: Zhejiang Chengdian Electric Co ltd
Current assignee: ANDELI GROUP CO LTD
Priority date: 2020-03-13
Filing date: 2020-03-13
Publication date: 2020-08-07
Anticipated expiration: 2040-03-13
Also published as: CN111508776B

Abstract

The invention discloses an alternating current contactor, which comprises a shell, a static iron core, a coil, a movable iron core, a movable support, a fixed support, a movable contact and a static contact, wherein the static iron core, the coil, the movable iron core, the movable support and the fixed support are arranged in the shell, the movable contact and the static contact are respectively arranged on the movable support and the fixed support, a loosening detection device for detecting the loosening of the movable contact is arranged in the shell, the alternating current contactor is characterized in that a contact loosening detection device is arranged in the alternating current contactor, and a micro air pressure sensor is arranged on a substrate corresponding to the movable contact, so that when the movable contact and the substrate loosen, air flow generated by a cooling fan enters the sealed shell through a through hole and contacts with the micro air pressure sensor, at the moment, the micro air pressure sensor can realize the effect of quickly detecting the movable contact, and simultaneously, a buzzer, meanwhile, potential safety hazards are further reduced, and the safety performance of the alternating current contactor is higher.

Description

AC contactor

Technical Field

The invention relates to the technical field of alternating current contactors, in particular to an alternating current contactor.

Background

The AC contactor usually adopts three arc extinguishing methods of double-break electric arc extinguishing, longitudinal seam arc extinguishing and grid plate arc extinguishing. The arc eliminating device is used for eliminating the electric arc generated in the separation and combination process of the moving contact and the static contact. Contactors with a capacity above 10A all have arc extinguishing devices. The AC contactor also has auxiliary components such as a reaction spring, a buffer spring, a contact pressure spring, a transmission mechanism, a base, a wiring terminal and the like.

At present, when an existing alternating current contactor is used, because the alternating current contactor carries out a plurality of times of switch closing processes, namely a coil is electrified, a connecting rod drives a contact to move, so that connection between a moving contact and a fixed contact is realized, and in the process of connecting the moving contact and the fixed contact, the process of mutual collision and friction is also a process, the process is repeated for a long time, the moving contact and the fixed contact are mutually abraded, when the abrasion degree exceeds 1mm, the phenomenon of burning loss of the moving contact can occur, meanwhile, the phenomenon of looseness can occur at the connection part of the moving contact and a substrate, meanwhile, because the moving contact is arranged on the inner side of the alternating current contactor, a worker cannot find the moving contact in time, and further certain potential safety hazards exist, therefore, the alternating current contactor is provided.

Disclosure of Invention

The present invention is directed to an ac contactor to solve the problems of the background art.

In order to achieve the purpose, the invention provides the following technical scheme: the alternating current contactor comprises a shell, a static iron core, a coil, a movable iron core, a movable support, a fixed support, a movable contact and a static contact, wherein the static iron core, the coil, the movable iron core, the movable support and the fixed support are arranged in the shell, the movable contact and the static contact are respectively arranged on the movable support and the fixed support, a looseness detection device is arranged in the shell when the movable contact is loosened, and the input end of the looseness detection device is connected with the.

Preferably, the movable contact is composed of a substrate and two movable contacts, a connecting spring is arranged at the position where the movable contact is connected with the movable support, and the movable contact and the fixed contact are connected through the connecting spring, so that the effect of buffering and damping is achieved when the movable contact is connected with the fixed contact.

Preferably, the contact looseness detection device comprises a sealing detection piece which is arranged at one end, far away from one ends of the two moving contacts, of the base plate, a connecting plate is arranged on the outer side of the sealing detection piece and fixedly connected with the bottom end of a connecting spring, a ventilation piece is arranged inside the shell, and the connecting spring is arranged so that the base plate and the moving support can be stably connected through the connecting plate.

Preferably, the housing is composed of a base, a middle frame and an upper cover, and the vent is located at the middle frame, so that the housing performs a stable supporting function on the internal components.

Preferably, the sealing detection piece comprises two through holes arranged on the substrate, the two through holes are respectively located at two moving contacts and are provided with an insulating pad outside the through holes and on the substrate, one side of the insulating pad is fixedly connected with a sealing shell, a miniature air pressure sensor is arranged inside the sealing shell, grooves are formed in the two sides of the middle of the sealing shell, the two ends of the bottom of the connecting plate are located at the grooves and are fixedly connected with the substrate, a buzzer is arranged on the outer side of the shell, and the buzzer and the miniature air pressure sensor are arranged, so that the effect of quickly detecting the moving contacts which are not loosened is achieved.

Preferably, the piece of ventilating is including setting up a plurality of inlet port and venthole in middle frame both sides respectively, the outside that middle frame corresponds the inlet port is equipped with filtration piece, and the inside that middle frame corresponds the inlet port is equipped with radiator fan, radiator fan's one end fixedly connected with connecting axle, and the connecting axle outside is equipped with the support frame, support frame and middle frame inner wall fixed connection, through the piece of ventilating that is equipped with to not only realize carrying out effectual effect of ventilating inside ac contactor, when appearing becoming flexible between movable contact and the base plate, inside the air current can follow gap inflow ac contactor, realized short-term test's effect, realize carrying out effectual radiating effect inside ac contactor simultaneously.

Preferably, filter including surrounding the setting in the inlet port outside and with middle frame fixed connection's support retaining ring, support retaining ring inside and be equipped with the thread groove, and threaded connection has the set casing on the thread groove, be equipped with a plurality of filtration pore on the set casing, and be equipped with the dampproof agent between set casing and the inlet port, through the filter piece that is equipped with to the realization carries out quick filtration volume effect to the air current that the inlet port got into.

Preferably, the diameter of the two through holes is smaller than that of the movable contact, so that the movable contact is connected to the outer side of the through holes in a covering mode.

Preferably, the connection plate is U-shaped, thereby facilitating the effect of stable connection between the connection plate and the base plate.

Compared with the prior art, the invention has the beneficial effects that:

when the alternating current contactor is used, the contact looseness detection device is arranged in the alternating current contactor and is provided with the miniature air pressure sensor on the base plate corresponding to the moving contact, so that when looseness occurs between the moving contact and the base plate, air flow generated by the cooling fan enters the sealing shell through the through hole and is in contact with the miniature air pressure sensor, at the moment, the miniature air pressure sensor can achieve the effect of quickly detecting the moving contact, meanwhile, the buzzer gives an alarm, further, workers can be quickly reminded, meanwhile, potential safety hazards are further reduced, and the using safety performance of the alternating current contactor is higher.

Drawings

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is an overall side view of the present invention;

FIG. 3 is a schematic view of the internal structure of the housing according to the present invention;

FIG. 4 is a schematic view of the connecting spring structure of the present invention;

FIG. 5 is a schematic structural diagram of a movable contact according to the present invention;

FIG. 6 is an enlarged view of area A of FIG. 1 in accordance with the present invention;

FIG. 7 is an enlarged view of area B of FIG. 3 in accordance with the present invention;

FIG. 8 is an enlarged view of area C of FIG. 3 according to the present invention.

In the figure: 1-a shell; 2-a stationary iron core; 3-a coil; 4-a movable iron core; 5-moving the support; 6-fixing a bracket; 7-moving contact; 8-static contact; 9-a looseness detection device; 10-a substrate; 11-a moving contact; 12-a connecting spring; 13-a seal detector; 14-a through hole; 15-an insulating pad; 16-a sealed shell; 17-a miniature air pressure sensor; 18-a groove; 19-a buzzer; 20-a connecting plate; 21-a venting member; 22-a base; 23-a middle frame; 24-an upper cover; 25-air intake; 26-air outlet holes; 27-a filter element; 28-a radiator fan; 29-a connecting shaft; 30-a support frame; 31-supporting retainer rings; 32-thread groove; 33-a stationary shell; 34-filtration pores.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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.

Referring to fig. 1-8, the present invention provides a technical solution: the alternating current contactor comprises a shell 1, wherein the shell 1 consists of a base 22, a middle frame 23 and an upper cover 24, and the base 22, the middle frame 23 and the upper cover 24 are fixedly connected;

the moving contact device comprises a static iron core 2, a coil 3, a moving iron core 4, a moving support 5, a fixed support 6, a moving contact 7 and a static contact 8, wherein the static iron core 2, the coil 3, the moving iron core 4, the moving support 5 and the fixed support 6 are arranged in a shell 1, the moving contact 7 and the static contact 8 are respectively arranged on the moving support 5 and the fixed support 6, the moving contact 7 consists of a base plate 10 and two moving contacts 11, and a connecting spring 12 is arranged;

the looseness detecting device 9 for detecting looseness of the moving contact 7 is arranged in the shell 1, the input end of the looseness detecting device 9 is connected with the moving contact 7, the contact looseness detecting device 9 comprises a sealing detecting piece 13 arranged at one end, far away from the two moving contacts 7, of a base plate 10, a connecting plate 20 is arranged on the outer side of the sealing detecting piece 13, the connecting plate 20 is U-shaped, the connecting plate 20 is fixedly connected with the bottom end of a connecting spring 12, the sealing detecting piece 13 comprises two through holes 14 arranged on the base plate 10, the two through holes 14 are respectively located at the two moving contacts 7, the diameters of the two through holes 14 are smaller than the diameters of the moving contacts 7, and the moving contacts 7 cover the outer sides of the through holes;

an insulating pad 15 is arranged on the outer sides of the two through holes 14 and positioned on the substrate 10, a sealing shell 16 is fixedly connected to one side of the insulating pad 15, a miniature air pressure sensor 17 is arranged in the sealing shell 16, grooves 18 are arranged on the two sides of the middle of the sealing shell 16, the two ends of the bottom of the connecting plate 20 are positioned at the grooves 18 and fixedly connected with the substrate 10, a buzzer 19 is arranged on the outer side of the shell 1, the insulating pad 15 enables a sealing state to be formed between the sealing shell 16 and the substrate 10, and the moving contact 7 is welded on the outer side of the through hole 14, so that the sealing state is further kept between the through hole 14 of the substrate 10 and the sealing shell 16, namely when the loss of contact abrasion between the moving contact 7 and the fixed contact 8 is less than 1mm, the moving contact 7 and the substrate 10 cannot be loosened, and the sealing;

the casing 1 is internally provided with an air vent 21, the air vent 21 is positioned at the middle frame 23, the air vent 21 comprises a plurality of air inlet holes 25 and air outlet holes 26 which are respectively arranged at two sides of the middle frame 23, the outer side of the middle frame 23 corresponding to the air inlet holes 25 is provided with a filter piece 27, the inner part of the middle frame 23 corresponding to the air inlet holes 25 is provided with a heat radiation fan 28, one end of the heat radiation fan 28 is fixedly connected with a connecting shaft 29, the outer side of the connecting shaft 29 is provided with a support frame 30, the support frame 30 is fixedly connected with the inner wall of the middle frame 23, the filter piece 27 comprises a support check ring 31 which is arranged at the outer side of the air inlet holes 25 and fixedly connected with the middle frame 23 in a surrounding manner, a thread groove 32 is arranged inside the support check ring 31, a fixing shell 33 is in threaded connection with the thread groove 32, a plurality of, in the process of operating the ac contactor, the heat dissipation fan 28 operates, so that the external air flow firstly enters the inside of the housing 1 through the filtering hole 34 and the air inlet hole 25 on the fixed shell 33, then the air flow entering the inside of the housing 1 is uniformly dispersed in the inside of the housing 1, when the abrasion of the movable contact 11 exceeds 1mm, the movable contact 11 and the base plate 10 will loosen, at this time, a part of the air flow is discharged through the air outlet hole 26, meanwhile, the heat in the ac contactor is taken away, another small part of the air flow passes through the gap formed by the base plate 10 and the movable contact 11 and enters the inside of the sealing shell 16 from the inside of the through hole 14, at this time, the micro air pressure sensor 17 in the sealing shell 16 detects the flowing pressure of the air flow, and then the buzzer 19 is controlled to give an alarm through the controller, thereby further realizing the function of prompting the working personnel, further reducing the potential safety hazard of the use of the alternating current contactor.

In the scheme, the type of the miniature air pressure sensor 17 is preferably IT121, the type of the buzzer 19 is preferably HY12G-07, the circuit operation is the conventional circuit, the circuits and control related in the invention are the prior art, and redundant description is not repeated herein.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. Ac contactor, including casing (1), set up at inside quiet iron core (2) of casing (1), coil (3), move iron core (4), moving movable support (5), fixed bolster (6), install moving contact (7) and static contact (8) on moving movable support (5) and fixed bolster (6) respectively, its characterized in that: the looseness detecting device (9) is arranged in the shell (1) and used for detecting looseness of the moving contact (7), and the input end of the looseness detecting device (9) is connected with the moving contact (7).

2. An ac contactor as claimed in claim 1, wherein: the moving contact (7) consists of a substrate (10) and two moving contacts (11), and a connecting spring (12) is arranged at the position where the moving contact (7) is connected with the moving support (5).

3. An ac contactor as claimed in claim 1, wherein: the contact looseness detection device (9) comprises a sealing detection piece (13) which is arranged on one end of a base plate (10) far away from one end of each of two moving contacts (7), a connecting plate (20) is arranged on the outer side of the sealing detection piece (13), the connecting plate (20) is fixedly connected with the bottom end of a connecting spring (12), and an air ventilation piece (21) is arranged inside the shell (1).

4. An ac contactor as claimed in claim 1, wherein: the shell (1) is composed of a base (22), a middle frame (23) and an upper cover (24), and the ventilation piece (21) is located at the middle frame (23).

5. An ac contactor as claimed in claim 3, wherein: the sealing detection piece (13) comprises two through holes (14) formed in a substrate (10), the two through holes (14) are respectively located at two moving contacts (7) and are arranged on the outer side of each through hole (14) and located on the substrate (10), an insulating pad (15) is arranged on one side of each insulating pad (15), a sealing shell (16) is fixedly connected to one side of each sealing shell, a miniature air pressure sensor (17) is arranged inside each sealing shell (16), grooves (18) are formed in the two sides of the middle of each sealing shell (16), the two ends of the bottom of each connecting plate (20) are located at the grooves (18) and fixedly connected with the substrate (10), and a buzzer (19) is arranged on the outer side of the shell (1).

6. An ac contactor as claimed in claim 3, wherein: ventilating piece (21) is including setting up a plurality of inlet port (25) and venthole (26) in middle frame (23) both sides respectively, the outside that middle frame (23) corresponds inlet port (25) is equipped with and filters piece (27), and the inside that middle frame (23) corresponds inlet port (25) is equipped with radiator fan (28), the one end fixedly connected with connecting axle (29) of radiator fan (28), and connecting axle (29) outside is equipped with support frame (30), support frame (30) and middle frame (23) inner wall fixed connection.

7. An ac contactor as claimed in claim 6, wherein: filter piece (27) including encircle set up in inlet port (25) outside and with middle frame (23) fixed connection's support retaining ring (31), support retaining ring (31) inside be equipped with thread groove (32), and threaded connection has set casing (33) on thread groove (32), be equipped with a plurality of filtration pore (34) on set casing (33), and be equipped with the dampproof agent between set casing (33) and inlet port (25).

8. An ac contactor as claimed in claim 5, wherein: the diameter of the two through holes (14) is smaller than that of the moving contact (7).

9. An ac contactor as claimed in claim 3, wherein: the connecting plate (20) is U-shaped.