Arc extinguishing structure of alternating current contactor

Abstract

The utility model discloses an arc extinguishing structure of an alternating current contactor, which comprises a shell, a cover shell is arranged above the shell, the cover shell is provided with a buffer chamber, arc extinguishing chambers are arranged at two ends of the shell, the arc extinguishing chambers are provided with arc striking pieces, the arc striking pieces are provided with arc blocking parts, and the arc blocking parts are arranged on the shell. The arc blocking part is provided with a plurality of arc striking holes at equal intervals, and the shell is provided with a pressure relief opening, so that the buffer chamber is communicated with the arc extinguishing chamber. Most flashover is blocked through the arc blocking part, and the flowing speed of high-temperature and high-pressure gas is reduced; a small part of flashover penetrates through the arc striking hole and the pressure relief opening, the advancing distance of high-temperature and high-pressure gas is prolonged, the flow speed of the gas is further reduced, and the effect of rapidly eliminating the flashover is achieved; the residual flashover enters the buffer chamber, the residual flashover is eliminated through the buffer chamber, the flashover is prevented from damaging the contact system, the design not only improves the arc extinguishing effect, but also enhances the safety and reliability of the product, and the service life of the contact device is obviously prolonged.

Description

Technical Field

[0001] This utility model relates to the field of low-voltage electrical technology, and in particular to an arc-extinguishing structure for an AC contactor. Background Technology

[0002] AC contactors are a type of low-voltage control electrical appliance widely used in the power industry, such as railway locomotives, elevators, and new energy fields. Their working principle is to use electromagnetic force and spring force to achieve the connection and disconnection of contacts, so as to frequently connect or disconnect electrical equipment. Therefore, the reliability of AC contactors directly affects the safety of electrical equipment.

[0003] Existing AC contactors typically use arc-extinguishing grids for rapid arc extinguishing. While this can eliminate most of the flying arc, some flying arc remains and continues to move within the arc-extinguishing chamber, damaging the stationary and moving contacts and reducing their service life. Furthermore, the high-temperature and high-pressure gas generated during arc generation increases air pressure, causing gas ionization and making it difficult to extinguish the flying arc. Therefore, the applicant has developed a beneficial design and found a solution to the above problems. The technical solution described below was developed in this context. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the traditional AC contactor design and provide a product that improves arc extinguishing effect and safety and reliability.

[0005] To solve the above problems, the present invention adopts the following technical solution.

[0006] An arc-extinguishing structure for an AC contactor includes a housing, a cover on top of the housing, a buffer chamber on the cover, arc-extinguishing chambers at both ends of the housing, an arc-initiating element in each arc-extinguishing chamber, an arc-blocking portion in each arc-blocking portion, a plurality of equally spaced arc-initiating holes in the housing, and a pressure relief port connecting the buffer chamber and the arc-extinguishing chamber, the pressure relief port being located above the arc-initiating holes.

[0007] Preferably, the housing is provided with stationary springs at both ends, and the stationary springs are provided with stationary contacts.

[0008] Preferably, a moving contact bridge is provided between the two stationary reeds, and the moving contact bridge is provided with a moving contact corresponding to the stationary contact.

[0009] Preferably, the arc-extinguishing chamber is provided with a fixing groove for accommodating the arc-initiating component, the fixing groove is provided with an arc-running channel and is located above the moving contact bridge.

[0010] Preferably, the arc-blocking part has a bent arc-leading part and is located above the arc-running channel.

[0011] Preferably, the arc-blocking part is perpendicular to the arc-initiating part.

[0012] Preferably, the pressure relief port and the arc-starting hole are misaligned.

[0013] Beneficial effects:

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0015] This invention blocks most of the arc flash by using an arc-blocking part and reduces the flow velocity of high-temperature and high-pressure gas. A small portion of the arc flash passes through the arc-initiating hole and the pressure relief port, extending the travel distance of the high-temperature and high-pressure gas and further reducing its flow velocity, thus achieving the effect of quickly eliminating the arc flash. The remaining arc flash enters the buffer chamber, where it is eliminated, preventing the arc flash from damaging the contact system. This design not only improves the arc extinguishing effect but also enhances the safety and reliability of the product and significantly extends the service life of the contact device. Attached Figure Description

[0016] Figure 1 This is a side cross-sectional view of the arc-extinguishing structure of an AC contactor according to the present invention.

[0017] Figure 2 This utility model Figure 1 A partially enlarged view A of the arc-extinguishing structure of an AC contactor;

[0018] The correspondence between the labels and component names in the attached figures is as follows:

[0019] Reference numerals in the attached drawings: 1. Housing; 2. Cover; 3. Arc-starting component; 4. Stationary spring; 5. Moving contact bridge; 11. Arc-extinguishing chamber; 12. Pressure relief port; 13. Fixing groove; 14. Arc-running channel; 21. Buffer chamber; 31. Arc-blocking part; 32. Arc-starting hole; 33. Arc-starting part; 41. Stationary contact; 51. Moving contact. Detailed Implementation

[0020] The technical solution of this utility model will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0021] In the description of this utility model, it should be understood that the terms "upper", "lower", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0022] In this embodiment of the utility model, "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0023] Reference example Figure 1 , Figure 2 An arc-extinguishing structure for an AC contactor includes a housing 1, a cover 2 on top of the housing 1, a buffer chamber 21 on the cover 2, arc-extinguishing chambers 11 at both ends of the housing 1, an arc-initiating element 3 on the arc-initiating element 3, an arc-blocking part 31 on the arc-blocking part 31, and several equally spaced arc-initiating holes 32 on the housing 1. A pressure relief port 12 connects the buffer chamber 21 to the arc-extinguishing chamber 11. The pressure relief port 12 is located above the arc-initiating holes 32. The arc-blocking part 31 blocks most of the flying arc and reduces the flow velocity of the high-temperature, high-pressure gas. A small portion of the flying arc passes through the arc-initiating holes 32 and the pressure relief port 12, extending the travel distance of the high-temperature, high-pressure gas and further reducing its flow velocity, achieving the effect of quickly eliminating the flying arc. The remaining flying arc enters the buffer chamber 21, where it is eliminated, preventing damage to the contact system. This design not only improves the arc-extinguishing effect but also enhances the safety and reliability of the product and significantly extends the service life of the contact device.

[0024] It is worth mentioning that the housing 1 has stationary springs 4 at both ends, and the stationary springs 4 have stationary contacts 41;

[0025] It is worth mentioning that a moving contact bridge 5 is provided between the two stationary reeds, and the moving contact bridge 5 is provided with a moving contact 51 corresponding to the stationary contact 41;

[0026] It is worth mentioning that the arc-extinguishing chamber 11 is provided with a fixing groove 13 for accommodating the arc-igniting component 3. The fixing groove 13 is provided with an arc-running channel 14 and is located above the moving contact bridge 5. An arc-extinguishing plate is also provided in the arc-extinguishing chamber 11, which undertakes the main arc-extinguishing task. Since it belongs to the prior art, it is not shown here. When the moving contact 51 separates from the stationary contact 41, the arc is pulled by the arc-igniting part 33 and enters the arc-extinguishing plate through the arc-running channel 14.

[0027] It is worth mentioning that the arc-blocking part 31 is provided with a bent arc-inducing part 33 and is located above the arc-running channel 14. The arc-blocking part 31 is located above the arc-extinguishing plate.

[0028] It is worth mentioning that the arc-blocking part 31 is perpendicular to the arc-initiating part 3;

[0029] It is worth mentioning that the pressure relief port 12 and the arc initiation hole 32 are misaligned. This misalignment extends the travel distance of the high-pressure gas and further reduces the flow rate of the high-pressure gas.

[0030] The above design scheme can enable the product to achieve the advantages of improved arc extinguishing effect and enhanced safety and reliability.

[0031] The above description, in conjunction with specific embodiments, provides a further detailed explanation of the present utility model. It should not be construed that the specific implementation of the present utility model is limited to these descriptions. For those skilled in the art, several simple deductions or substitutions can be made without departing from the concept of the present utility model, and all such deductions or substitutions should be considered to fall within the scope of protection defined by the claims submitted by the present utility model.

Claims

1. An arc-extinguishing structure for an AC contactor, comprising a housing (1) and a cover (2) disposed above the housing (1), characterized in that: The cover (2) is provided with a buffer chamber (21), and the two ends of the shell (1) are provided with arc extinguishing chambers (11). The arc extinguishing chamber (11) is provided with an arc ignition component (3). The arc ignition component (3) is provided with an arc blocking part (31). The arc blocking part (31) is provided with a plurality of equally spaced arc ignition holes (32). The shell (1) is provided with a pressure relief port (12) so that the buffer chamber (21) and the arc extinguishing chamber (11) are connected. The pressure relief port (12) is located above the arc ignition holes (32).

2. The arc-extinguishing structure of the AC contactor according to claim 1, characterized in that: The housing (1) is provided with stationary springs (4) at both ends, and the stationary springs (4) are provided with stationary contacts (41).

3. The arc-extinguishing structure of the AC contactor according to claim 2, characterized in that: A movable contact bridge (5) is provided between the two stationary reeds, and the movable contact bridge (5) is provided with a movable contact (51) corresponding to the stationary contact (41).

4. The arc-extinguishing structure of the AC contactor according to claim 3, characterized in that: The arc-extinguishing chamber (11) is provided with a fixing groove (13) for accommodating the arc-initiating component (3), and the fixing groove (13) is provided with an arc-running channel (14) and is located above the moving contact bridge (5).

5. The arc-extinguishing structure of the AC contactor according to claim 4, characterized in that: The arc-blocking part (31) is provided with a bent arc-leading part (33) and is located above the arc-running channel (14).

6. The arc-extinguishing structure of the AC contactor according to claim 1, characterized in that: The arc-blocking part (31) is perpendicular to the arc-inducing part (3).

7. The arc-extinguishing structure of the AC contactor according to claim 1, characterized in that: The pressure relief port (12) and the arc-starting hole (32) are misaligned.

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