Direct current contactor

Abstract

The utility model relates to a direct current contactor, which comprises a bottom plate, an electromagnetic assembly and a contact system, the electromagnetic assembly comprises a coil framework, a yoke, a coil, a static iron core and a movable iron core, the contact system comprises a base, a cover body and a contact assembly, and a contact cavity used for placing the contact assembly is formed between the base and the cover body. The contact assembly comprises two static contacts arranged in the base, a contact frame in linkage fit with the movable iron core, and a movable contact arranged on the contact frame in a linkage mode and matched with the two static contacts, and the movable contact is provided with two movable contact points matched with the two static contacts. An arc extinguish chamber communicated with the contact cavity is arranged on one side of the base and one side of the cover body, and one end of each static contact is provided with an arc striking angle which is bent and extends towards the arc extinguish chamber. The utility model has the advantages of simple structure, stable and reliable performance, convenient assembly and good protection performance.

Description

Technical Field

[0001] The utility model relates to the technical field of contactors, in particular to a DC contactor. Background Art

[0002] A contactor is an electrical device used in industrial power plants that uses current flowing through a coil to generate a magnetic field, closing contacts to control the load. A contactor consists of an electromagnetic system (armature, stator, and electromagnetic coil), a contact system (normally open and normally closed contacts), and an arc extinguishing device. The principle of an electromagnetic contactor is that when the electromagnetic coil of the contactor is energized, it generates a strong magnetic field, causing the stator to generate an electromagnetic attraction that attracts the armature and drives the contacts: the normally closed contact opens and the normally open contact closes, and the two are linked. When the coil is de-energized, the electromagnetic attraction disappears, and the armature is released by the release spring, causing the contacts to return to their normal state: the normally closed contact closes and the normally open contact opens.

[0003] Currently, contactors used in electric locomotives, hybrid locomotives, substations, and other high-current industrial control applications frequently burn out. These contactors are often caused by improperly designed operating and contact mechanisms, resulting in excessively small contact spacing and poor arc extinguishing performance. Furthermore, these contactors suffer from poor protection, unreliable performance, and inconvenient assembly. Summary of the Invention

[0004] The purpose of the utility model is to overcome the defects of the prior art and provide a DC contactor with simple structure, stable and reliable performance, convenient assembly and good protection performance.

[0005] To achieve the above-mentioned purpose, the utility model adopts a DC contactor, including a base plate, an electromagnetic assembly arranged on the base plate, and a contact system, the electromagnetic assembly including a coil frame arranged on the base plate, a yoke arranged on the coil frame, a coil arranged on the coil frame, a static iron core arranged in the coil frame, and a moving iron core movably arranged on the coil frame and matched with the static iron core, the contact system including a base arranged on the yoke, a cover body arranged on the base, and a contact assembly, a contact cavity for placing the contact assembly is formed between the base and the cover body, the contact assembly is provided with two static contacts in the base, a contact frame linked to the moving iron core, and a moving contact linked to the contact frame and matched with the two static contacts, the moving contact is provided with two moving contacts matching with the two static contacts, an arc extinguishing chamber connected to the contact cavity is provided on one side of the base and the cover body, and one end of the two static contacts has an arc striking angle bent and extended toward the arc extinguishing chamber.

[0006] The beneficial effects of this structure are as follows: the contact system adopts a dual-contact structure design with sufficient spacing to ensure arc splitting capability, minimize damage to the contacts, and extend their service life. The contact assembly is housed within the contact cavity, providing enhanced protection against wind and sand, and is maintenance-free, reducing maintenance costs for users. The arc within the contact cavity can quickly enter the arc extinguishing chamber, improving arc extinguishing performance. Consequently, this DC contactor offers the advantages of a simple structure, stable and reliable performance, easy assembly, and excellent protection.

[0007] In particular, the arc extinguishing chamber is provided with an arc extinguishing channel connected to the contact cavity, and an arc extinguishing plate is provided in the arc extinguishing channel. The arc in the contact cavity can quickly enter the arc extinguishing channel, and the arc extinguishing plate can quickly extinguish the arc, thereby improving the arc extinguishing performance of the DC contactor.

[0008] Specifically, the contact frame includes a push rod extending outside the cover. The cover is equipped with two microswitches that cooperate with the push rod. The push rod moves with the contact frame and triggers the two microswitches, switching them on and off. These two microswitches monitor the operating position of the contact frame, thereby improving the reliability of the DC contactor. Furthermore, the microswitches feature a fully sealed design, providing enhanced protection.

[0009] In particular, the push rod is provided with inclined surfaces on both sides that cooperate with the buttons of the two micro switches. These inclined surfaces move with the push rod and contact the buttons of the micro switches. The push rod triggers the micro switches via the inclined surfaces, preventing the push rod from getting stuck with the micro switch buttons, which helps improve the operating reliability of the AC contactor.

[0010] In particular, the movable contact has two arc-strike plates on one side corresponding to the two movable contact points, and the two arc-strike plates are bent and extended toward the arc-extinguishing chamber. The arc-strike plates can quickly guide the arc on the movable contact into the arc-extinguishing chamber, thereby improving the arc-extinguishing performance of the DC contactor.

[0011] In particular, two limiting grooves are provided on either side of the movable contact, and two limiting blocks are provided on the contact frame to cooperate with the two limiting grooves. The two limiting blocks are respectively engaged in the two limiting grooves, thereby forming a snap-fit connection between the movable contact and the contact frame. The movable contact and the contact frame are assembled using a snap-fit connection method, which improves assembly efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a cross-sectional view of an embodiment of the present invention.

[0013] Figure 2 This is an exploded view of an embodiment of the present utility model.

[0014] Figure 3This is an assembly diagram of the moving iron core, contact support and indicator parts of an embodiment of the present utility model. DETAILED DESCRIPTION

[0015] like Figures 1 to 3 As shown, the embodiment of the present utility model is a DC contactor, including a base plate 10, an electromagnetic assembly 20 arranged on the base plate 10, and a contact system 30, wherein the electromagnetic assembly 20 includes a coil skeleton 21 arranged on the base plate 10, a yoke 22 arranged on the coil skeleton 21, a coil 23 arranged on the coil skeleton 21, a static iron core 24 arranged in the coil skeleton 21, and a movable iron core 25 movably arranged on the coil skeleton 21 and matched with the static iron core 24, the contact system 30 includes a base 31 arranged on the yoke 22, a cover 32 arranged on the base 31, and a contact assembly 33, wherein the base 31 and the cover A contact cavity 300 for accommodating a contact assembly 33 is formed between the base 31 and the cover 31. The contact assembly 33 comprises two stationary contacts 331 within the base 31, a contact holder 332 that cooperates with the movable iron core 25, and a movable contact 333 that is mounted on the contact holder 332 and cooperates with the two stationary contacts 331. The movable contact 333 is provided with two movable contact points 3331 that cooperate with the two stationary contacts 331. An arc extinguishing chamber 34 communicating with the contact cavity 300 is provided on one side of the base 31 and the cover 31. One end of the two stationary contacts 331 has an arc striking angle 3311 that bends and extends toward the arc extinguishing chamber 34. The arc extinguishing chamber 34 is provided with an arc extinguishing channel 340 communicating with the contact cavity 300. An arc extinguishing plate 341 is disposed within the arc extinguishing channel 34. The arc within the contact cavity can quickly enter the arc extinguishing channel, and the arc extinguishing plate can quickly extinguish the arc, thereby improving the arc extinguishing performance of the DC contactor. The contact frame 332 has a top rod 3321 extending outside the cover 31. The cover 31 is provided with two microswitches 35 that cooperate with the top rod 3321. The top rod 3321 moves with the contact frame 332 and triggers the two microswitches 35, connecting or disconnecting the two microswitches 35. The two microswitches can monitor the working position of the contact frame, thereby improving the operating reliability of the DC contactor. The microswitches also adopt a fully sealed structure design, which provides better protection. The top rod 3321 is provided with a contact bevel 3322 on both sides, which cooperate with the buttons 351 of the two microswitches 35. The contact bevel 3322 moves with the top rod 3321 and contacts the buttons 351 of the microswitches 35. The push rod triggers the micro switch by contacting the inclined surface, which can avoid the push rod and the micro switch button from being stuck, and is beneficial to improving the working reliability of the AC contactor.

[0016] like Figure 2 and 3As shown, the movable contact 333 has two arc-striking pieces 3332 on one side corresponding to the two movable contacts 3331, and the two arc-striking pieces 3332 are bent and extended toward the arc extinguishing chamber 34. The arc-striking pieces can quickly introduce the arc on the movable contact into the arc extinguishing chamber, thereby improving the arc extinguishing performance of the DC contactor. Two limiting grooves 3333 are provided on both sides of the movable contact 333, and two limiting blocks 3323 that cooperate with the two limiting grooves 3333 are provided on the contact frame 332. The two limiting blocks 3323 are respectively engaged in the two limiting grooves 3333, and constitute a snap-fit fit between the movable contact 333 and the contact frame 332. The movable contact and the contact frame are assembled in a snap-fit manner, which has higher assembly efficiency.

[0017] The contact system utilizes a dual-contact design with ample spacing to ensure arc-splitting capability, minimizing damage to the contacts and extending their service life. The contact assembly is housed within the contact cavity, offering enhanced protection against wind and sand, and is maintenance-free, reducing maintenance costs. The arc within the contact cavity quickly enters the arc extinguishing chamber, enhancing arc extinguishing performance. This DC contactor offers the advantages of a simple structure, stable and reliable performance, easy assembly, and excellent protection.

Claims

1. A DC contactor comprising a base plate, an electromagnetic assembly disposed on the base plate, and a contact system, wherein the electromagnetic assembly comprises a coil bobbin disposed on the base plate, a yoke disposed on the coil bobbin, a coil disposed on the coil bobbin, a stationary iron core disposed within the coil bobbin, and a movable iron core movably disposed on the coil bobbin and cooperating with the stationary iron core, characterized in that: The contact system includes a base arranged on a yoke, a cover body arranged on the base, and a contact assembly. A contact cavity for placing the contact assembly is formed between the base and the cover body. The contact assembly is provided with two static contacts in the base, a contact frame that cooperates with the moving iron core, and a moving contact that is linked and arranged on the contact frame and cooperates with the two static contacts. Two moving contacts that cooperate with the two static contacts are provided on the moving contact. An arc extinguishing chamber connected to the contact cavity is provided on one side of the base and the cover body. One end of the two static contacts has an arc striking angle that is bent and extended toward the arc extinguishing chamber.

2. The DC contactor according to claim 1, characterized in that: The arc extinguishing chamber is provided with an arc extinguishing channel connected with the contact cavity, and an arc extinguishing sheet is provided in the arc extinguishing channel.

3. The DC contactor according to claim 1 or 2, characterized in that: The contact frame has a push rod extending outside the cover body, and the cover body is provided with two micro switches that cooperate with the push rod. The push rod moves with the contact frame and triggers the two micro switches to achieve the connection or disconnection of the two micro switches.

4. The DC contactor according to claim 3, characterized in that: Both sides of the push rod are respectively provided with abutment slopes which match with the buttons of two micro switches. The abutment slopes move with the push rod and abut against the buttons of the micro switches.

5. The DC contactor according to claim 1 or 2, characterized in that: The movable contact is provided with two arc-striking pieces at one side corresponding to the two movable contact points, and the two arc-striking pieces are bent and extended toward the arc extinguishing chamber.

6. The DC contactor according to claim 1 or 2, characterized in that: Two limiting grooves are provided on both sides of the moving contact, and two limiting blocks matching the two limiting grooves are provided on the contact frame. The two limiting blocks are respectively engaged in the two limiting grooves, and constitute a snap-fitting fit between the moving contact and the contact frame.

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