Arc extinguishing exhaust structure and switching electric appliance

Abstract

The arc-extinguishing exhaust structure comprises an arc-extinguishing chamber installed in a shell, the shell is provided with an exhaust port and a containing cavity located on the arc inlet side of the arc-extinguishing chamber and used for containing a contact mechanism, a first channel is formed between the exhaust side of the arc-extinguishing chamber and the exhaust port, and the containing cavity is communicated with the first channel through a second channel. The second channel is communicated with the accommodating cavity through a communication port, an elastic insulating plate is arranged in the second channel and comprises a fixed part and a movable part, and the movable part covers the communication port when the elastic insulating plate is in an original state; and when the elastic insulating plate deforms, the movable part moves in the direction far away from the communication port. The switching device comprises the arc extinguishing and exhausting structure. According to the arc-extinguishing exhaust structure and the switching device, the accommodating chamber where the contact mechanism is located is communicated with the main exhaust channel through the arc-extinguishing grid sheet gap of the arc-extinguishing chamber and is also communicated with the main exhaust channel through the auxiliary exhaust channel, and the movable part of the elastic insulating plate is movably blocked between the accommodating chamber and the auxiliary exhaust channel, so that the shell is prevented from being broken.

Description

Technical Field

[0001] The utility model relates to the field of low-voltage electrical appliances, and particularly relates to an arc extinguishing and exhaust structure and a switching electrical appliance. Background Art

[0002] In a switching electrical appliance, especially a control and protection switching electrical appliance with the ability to frequently connect and disconnect under load and protect circuits against overload, short circuit, locked rotor, etc., an arc will be generated during the breaking process of the contact mechanism. A large amount of high-temperature gas will be generated when the arc passes through the arc extinguishing chamber. In the existing switching electrical appliances, due to the airtight shell, when the switch breaks a large short-circuit current, the air pressure in the chamber where the contact mechanism is located is relatively high, which is likely to cause the shell to burst. Summary of the Invention

[0003] The purpose of the utility model is to overcome at least one defect of the prior art, and provide an arc extinguishing and exhaust structure and a switching electrical appliance.

[0004] To achieve the above purpose, the utility model adopts the following technical solutions:

[0005] The arc extinguishing and exhaust structure includes an arc extinguishing chamber installed in a shell. One side of the arc extinguishing chamber close to the contact mechanism is the arc inlet side, and the other side far from the contact mechanism is the exhaust side. The shell is provided with an exhaust port and a receiving chamber located on the arc inlet side of the arc extinguishing chamber and used for receiving the contact mechanism. A first channel is formed between the exhaust side of the arc extinguishing chamber and the exhaust port of the shell. The receiving chamber is communicated with the first channel through a second channel located below the arc extinguishing chamber. The second channel is communicated with the receiving chamber through a communication port. An elastic insulating plate is arranged in the second channel. The elastic insulating plate includes a fixed part and a movable part. When the elastic insulating plate is in its original state, the movable part covers the communication port; when the elastic insulating plate is deformed, the movable part moves in a direction away from the communication port.

[0006] Optionally, a first partition and a second partition serving as the bottom wall of the receiving chamber are arranged in the shell. A second channel is formed by the interval between the first partition and the bottom wall of the shell. A communication port is formed by the interval between the first partition and the second partition.

[0007] Optionally, the fixed part of the elastic insulating plate is fixed on the second partition, and the movable part is lapped on the first partition.

[0008] Optionally, a lapping port is arranged on the first partition. The lapping port has a guiding inclined surface and a lapping plane for fitting with the movable part. The guiding inclined surface is inclined towards the exhaust side of the arc extinguishing chamber and away from the arc inlet side.

[0009] Optionally, a limiting groove communicated with the second channel is arranged on the second partition. The fixed part is limited and fixed in the limiting groove.

[0010] Optionally, a first limiting column located on the bottom wall of the limiting groove and a second limiting column located on the top wall of the limiting groove are provided in the limiting groove, and the second limiting column is staggered with the first limiting column in a direction close to the second channel, and the fixing part includes a first straight section, a second straight section and a bent section connected in sequence, the first straight section is vertically connected to the second straight section, the first straight section is limited between the first limiting column and the top wall of the limiting groove, the second straight section is limited between the first limiting column and the second limiting column, the bent section is limited between the second limiting column and the bottom wall of the limiting groove, and is connected to the movable part.

[0011] Optionally, it also includes an arc-striking piece, which extends from the bottom of the contact mechanism along the bottom wall of the accommodating chamber to below the arc extinguishing chamber, and the arc-striking piece has a bulge that bulges upward to the arc entry side of the arc extinguishing chamber.

[0012] Optionally, the contact mechanism includes a static contact, a moving contact, a contact support and a contact spring for providing contact pressure for the moving contact, the moving contact is provided with a moving contact point for cooperating with the static contact point of the static contact, the moving contact is mounted on one end of the contact support, and the other end of the contact support is provided with an actuated rod extending out of the shell.

[0013] Optionally, the contact mechanism is provided with two static contacts, and the two static contacts are symmetrically arranged on the top wall of the accommodating chamber. An installation cavity is provided on one end of the contact support, and the moving contact is a bridge-type structure. The moving contact is inserted into the installation cavity, and both ends extend out of the installation cavity and are located below the static contact. A moving contact is provided at each end of the moving contact, which respectively cooperates with the static contacts of the two static contacts; the arc extinguishing exhaust structure includes two arc extinguishing chambers symmetrically arranged on both sides of the contact mechanism, and exhaust ports are respectively provided on the opposite side walls of the shell; the static contact is provided with an arc striking angle, and the arc striking angle extends from the static contact to the top of the arc extinguishing chamber.

[0014] A switching device, comprising any arc extinguishing exhaust structure described in any one of the items.

[0015] The utility model discloses an arc extinguishing exhaust structure and a switch electrical appliance, wherein the accommodating chamber where the contact mechanism is located is connected with the main exhaust passage through the gap between the arc extinguishing grids of the arc extinguishing chamber, and is also connected through the auxiliary exhaust passage, and the movable portion of the elastic insulating plate is movably blocked between the accommodating chamber and the auxiliary exhaust passage, so that when the pressure in the accommodating chamber is relatively high, the elastic insulating plate is stretched open to release the pressure so as to avoid rupture of the shell maintaining the accommodating chamber, and the plate is kept sealed when the pressure in the accommodating chamber is normal so as to improve the breaking capacity.

[0016] In addition, the movable part of the elastic insulating plate is closer to the main exhaust passage than the fixed part, so that the opening generated by the deformation of the elastic insulating plate faces the main exhaust passage, enabling the gas flowing from the accommodation chamber into the auxiliary exhaust passage to quickly flow towards the main exhaust passage, thereby quickly relieving the pressure of the accommodation chamber. Description of the Drawings

[0017] Figure 1 is a top view of the internal structure of the present utility model within the housing;

[0018] Figure 2 is a front view of the internal structure of the present utility model within the housing, showing the gas flow direction at low current;

[0019] Figure 3 is a front view of the internal structure of the present utility model within the housing, showing the gas flow direction at high current;

[0020] Figure 4 is the present utility model Figure 3 is an enlarged view of a partial structure therein;

[0021] Figure 5 is a schematic structural view of the arc extinguishing chamber, contact mechanism, arcing piece and elastic insulating plate of the present utility model;

[0022] Figure 6 is a schematic structural view of the arcing piece of the present utility model.

[0023] Housing 1; exhaust port 11; accommodation chamber 12; first channel 13; second channel 14; communication port 15; first partition 16; docking interface 161; guiding inclined surface 162; docking plane 163; second partition 17; limiting groove 18; first limiting post 181; second limiting post 182; arc extinguishing chamber 2; arc extinguishing grid piece 21; mounting side plate 22; elastic insulating plate 3; fixed part 31; first straight section 311; second straight section 312; bending section 313; movable part 32; static contact 4; static contact point 41; arcing angle 42; moving contact 5; moving contact point 51; contact support 6; mounting through cavity 61; driven rod 62; contact spring 7; arcing piece 8; raised part 81; positioning protrusion 82. Detailed Embodiment

[0024] The following embodiments given in conjunction with the drawings further illustrate the detailed embodiments of the arc extinguishing and exhaust structure of the present utility model and the switch electrical appliance. The arc extinguishing and exhaust structure of the present utility model and the switch electrical appliance are not limited to the descriptions of the following embodiments.

[0025] The switching device of this embodiment includes an arc extinguishing and exhaust structure. The arc extinguishing and exhaust structure of this embodiment is applicable to control and protection switching devices, such as contactors and circuit breakers. A circuit breaker generally includes an operating mechanism, a contact mechanism, and a protection mechanism. The operating mechanism can drive the contact mechanism to be normally switched on and off; the protection mechanism includes a short-circuit protection mechanism and / or an overload protection mechanism. When a short-circuit current appears in the circuit breaker, the short-circuit protection mechanism drives the operating mechanism to trip, causing the contact mechanism to break, realizing the power-off protection of the circuit breaker. This is the prior art and will not be elaborated here. As Figure 1 shown, the switching device of this embodiment can be provided with one or more groups of arc extinguishing and exhaust structures.

[0026] As Figure 2 and Figure 3 shown, the arc extinguishing and exhaust structure of this embodiment includes an arc extinguishing chamber 2 installed in the housing 1. The arc extinguishing chamber 2 includes two installation side plates 22 and a plurality of arc extinguishing grid plates 21 that are located between the installation side plates 22 and are arranged in a stacked and spaced manner. The side of the arc extinguishing chamber 2 close to the contact mechanism is the arc inlet side, and the other side far from the contact mechanism is the exhaust side. The housing 1 is provided with an exhaust port 11 and a receiving chamber 12 located on the arc inlet side of the arc extinguishing chamber 2 and used for receiving the contact mechanism. A first channel 13 serving as the main exhaust channel is formed between the exhaust side of the arc extinguishing chamber 2 and the exhaust port 11 of the housing 1. The receiving chamber 12 and the first channel 13 are in clearance communication through the arc extinguishing grid plates 21 of the arc extinguishing chamber 2.

[0027] Particularly, the receiving chamber 12 and the first channel 13 are also communicated through a second channel 14 located below the arc extinguishing chamber 2. A communication port 15 is provided between the second channel 14 and the receiving chamber 12, and the two are communicated through the communication port 15, so that the second channel 14 serves as an auxiliary exhaust channel. An elastic insulating plate 3 is provided in the second channel 14. The elastic insulating plate 3 includes a fixed part 31 and a movable part 32. When the elastic insulating plate 3 is in its original state, the movable part 32 covers the communication port 15; when the elastic insulating plate 3 is deformed, the movable part 32 moves in a direction away from the communication port 15. As Figure 2 shown, when normal load current and a small short-circuit current are interrupted, the air pressure in the receiving chamber 12 is small and is not sufficient to push open the movable part 32 of the elastic insulating plate 3. The arc gas normally passes through the gaps between the arc extinguishing grid plates 21 of the arc extinguishing chamber 2, enters the first channel 13, and finally is discharged from the exhaust port 11 of the housing 1; as Figure 3As shown, when a large short-circuit current is interrupted, the gas pressure in the accommodation chamber 12 is relatively large, the arc gas pushes open the movable portion 32 of the elastic insulating plate 3, and part of the gas passes through the opening formed by the deformation of the elastic insulating plate 3, enters the first channel 13 through the second channel 14, and finally exits the housing 1 from the exhaust port 11. In the arc extinguishing exhaust structure and switch electrical appliance of this embodiment, the accommodation chamber 12 where the contact mechanism is located is connected with the main exhaust channel (first channel 13) through the gap between the arc extinguishing grid 21 of the arc extinguishing chamber 2, and is also connected through the auxiliary exhaust channel (second channel 14), and the movable portion 32 of the elastic insulating plate 3 is movably blocked between the accommodation chamber 12 and the auxiliary exhaust channel, so that when the pressure in the accommodation chamber 12 is relatively large, the elastic insulating plate 3 is pushed open to release the pressure to avoid the housing 1 maintaining the accommodation chamber 12 from being broken, and when the pressure in the accommodation chamber 12 is normal, it remains sealed to improve the breaking capacity.

[0028] like Figures 2 - 4 As shown, the housing 1 is provided with a first partition 16 located below the arc extinguishing chamber 2 and a second partition 17 as the bottom wall of the accommodating chamber 12, the first partition 16 and the bottom wall of the housing 1 are spaced to form the second channel 14, the first partition 16 and the second partition 17 are spaced to form the connecting port 15, the fixed portion 31 of the elastic insulating plate 3 is fixed on the second partition 17, and the movable portion 32 is overlapped on the first partition 16. The movable portion 32 of the elastic insulating plate 3 is closer to the main exhaust channel (first channel 13) than the fixed portion 31, so that the opening formed by the deformation of the elastic insulating plate 3 faces the main exhaust channel, so that the gas flowing from the accommodating chamber 12 into the auxiliary exhaust channel (second channel 14) quickly flows to the main exhaust channel, and the accommodating chamber 12 is quickly depressurized. Preferably, a lap joint 161 is provided on the first partition 16, and the lap joint 161 has a guide slope 162 and a lap plane 163 for fitting with the movable part 32, and the guide slope 162 is inclined in a direction close to the exhaust side of the arc extinguishing chamber 2 and away from the arc inlet side; the movable part 32 is a straight structure, and the movable part 32 is located in the lap joint 161 and fits with the lap plane 163 when it is in a state of covering the connecting port 15. The guide slope 162 plays a role of guiding flow, further improving the speed of pressure relief. It should be noted that the second channel 14 may not be arranged on the bottom side of the arc extinguishing chamber, and the fixed part 31 of the elastic insulating plate 3 may also be fixed on the first partition 16, and the movable part 32 is overlapped on the second partition 17.

[0029] like Figures 2 - 4As shown, the fixing structure of the elastic insulating plate 3 in this embodiment. A limiting groove 18 communicating with the second channel 14 is provided on the second partition 17, and the fixing portion 31 is limited and fixed in the limiting groove 18. A first limiting post 181 is provided on the bottom wall of the limiting groove 18 and a second limiting post 182 is provided on the top wall of the limiting groove 18 within the limiting groove 18. The second limiting post 182 is arranged offset from the first limiting post 181 in a direction close to the second channel 14. The fixing portion 31 includes a first straight section 311, a second straight section 312 and a bending section 313 connected in sequence. The first straight section 311 is vertically connected to the second straight section 312. The first straight section 311 is limited between the first limiting post 181 and the top wall of the limiting groove 18. The second straight section 312 is limited between the first limiting post 181 and the second limiting post 182. The bending section 313 is limited between the second limiting post 182 and the bottom wall of the limiting groove 18 and is connected to the movable portion 32. The bending section 313 is preferably an arc, and the bottom surface of the second limiting post 182 is preferably an arc surface. The bent fixing portion 31 and the bent limiting groove 18 are in limiting cooperation, so that the fixing portion 31 as the deformation support part of the elastic insulating plate 3 is firmly installed.

[0030] As Figure 5 and Figure 6 shown, the arc extinguishing and exhaust structure of this embodiment further includes an arc guiding piece 8. The arc guiding piece 8 extends from the bottom of the contact mechanism along the bottom wall of the accommodating chamber 12 (i.e., the second partition 17) to the lower part of the arc extinguishing chamber 2. The arc guiding piece 8 has a raised portion 81 that bulges upward to the incoming arc side of the arc extinguishing chamber 2. The arc guiding piece 8 serves to quickly introduce the arc into the arc extinguishing chamber 2, improving the arc extinguishing effect.

[0031] As Figure 5 and Figure 6 shown, the contact mechanism of this embodiment includes a static contact 4, a moving contact 5, a contact support 6 and a contact spring 7 that provides contact pressure for the moving contact 5. The moving contact 5 is provided with a moving contact point 51 for cooperating with the static contact point 41 of the static contact 4. The moving contact 5 is installed at one end of the contact support 6. The other end of the contact support 6 is provided with a driven rod 62 that extends out of the housing 1 for being driven by the operating mechanism. The static contact 4 is provided with an arc guiding angle 42 that extends from the static contact point 41 to the upper part of the arc extinguishing chamber 2. The arc guiding angle 42 serves to quickly introduce the arc into the arc extinguishing chamber 2, improving the arc extinguishing effect.

[0032] Preferably, the contact mechanism is provided with two static contacts 4, the two static contacts 4 are symmetrically arranged on the top wall of the accommodation chamber 12, one end of the contact support 6 is provided with an installation through cavity 61, the moving contact 5 is of a bridge structure, the moving contact 5 is inserted into the installation through cavity 61, and both ends extend out of the installation through cavity 61 and are located below the static contacts 4. One moving contact 51 is provided at each of the two ends of the moving contact 5, and is respectively matched with the static contacts 41 of the two static contacts 4; the contact spring 7 is placed in the installation through cavity 61, and both ends are respectively connected with the middle part of the moving contact 5 and the bottom wall of the installation through cavity 61. The contact mechanism of this embodiment is a double-contact structure composed of a bridge-shaped moving contact 5 and two static contacts 4. Of course, the contact mechanism can also be a single-contact structure.

[0033] Correspondingly, the arc extinguishing and exhaust structure includes two arc extinguishing chambers 2 symmetrically arranged on both sides of the contact mechanism. Exhaust ports 11 are provided on the opposite side walls of the housing 1 ( Figure 2 ). The middle part of the arc ignition piece 8 bulges downward to form a U-shaped positioning protrusion 82. The positioning protrusion 82 is placed in the positioning notch of the second partition plate 17, and both ends of the positioning protrusion 82 respectively extend along the second partition plate 17 towards the two arc extinguishing chambers 2.

[0034] It should be noted that in the description of the present invention, the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship when in use and commonly placed, and is only for the convenience of description, rather than indicating that the device or element referred to must have a specific orientation. Therefore, it cannot be understood as a limitation to the present invention. In addition, the terms "first", "second", "third", etc. are only used for distinguishing descriptions and cannot be understood as indicating relative importance.

[0035] The above content is a further detailed description of the present invention in combination with specific preferred embodiments. It cannot be determined that the specific implementation of the present invention is only limited to these descriptions. For those of ordinary skill in the technical field to which the present invention belongs, without departing from the concept of the present invention, several simple deductions or substitutions can be made, and all should be regarded as belonging to the protection scope of the present invention.

Claims

1. Arc extinguishing and exhaust structure, including an arc extinguishing chamber (2) installed in a housing (1). One side of the arc extinguishing chamber (2) close to the contact mechanism is the arc inlet side, and the other side away from the contact mechanism is the exhaust side. The housing (1) is provided with an exhaust port (11) and a receiving chamber (12) located on the arc inlet side of the arc extinguishing chamber (2) and used for accommodating the contact mechanism. A first channel (13) is formed between the exhaust side of the arc extinguishing chamber (2) and the exhaust port (11) of the housing (1), and it is characterized in that: The accommodation chamber (12) is communicated with the first channel (13) through a second channel (14) located below the arc extinguishing chamber (2). The second channel (14) is communicated with the accommodation chamber (12) through a communication port (15). An elastic insulating plate (3) is arranged in the second channel (14). The elastic insulating plate (3) includes a fixing part (31) and a movable part (32). When the elastic insulating plate (3) is in its original state, the movable part (32) covers the communication port (15). When the elastic insulating plate (3) is deformed, the movable part (32) moves in a direction away from the communication port (15).

2. The arc extinguishing and exhaust structure according to claim 1, wherein: A first partition plate (16) located below the arc extinguishing chamber (2) and a second partition plate (17) serving as the bottom wall of the accommodation chamber (12) are arranged in the housing (1). A second channel (14) is formed by an interval between the first partition plate (16) and the bottom wall of the housing (1). A communication port (15) is formed by an interval between the first partition plate (16) and the second partition plate (17).

3. The arc extinguishing and exhaust structure according to claim 2, characterized in that: The fixing part (31) of the elastic insulating plate (3) is fixed on the second partition plate (17), and the movable part (32) is lapped on the first partition plate (16).

4. The arc extinguishing and exhaust structure according to claim 3, characterized in that: A lapping port (161) is arranged on the first partition plate (16). The lapping port (161) has a guiding inclined surface (162) and a lapping plane (163) for fitting with the movable part (32). The guiding inclined surface (162) is inclined in a direction close to the exhaust side of the arc extinguishing chamber (2) and away from the incoming arc side.

5. The arc extinguishing and exhaust structure according to claim 3, wherein: A limiting groove (18) communicated with the second channel (14) is arranged on the second partition plate (17). The fixing part (31) is limited and fixed in the limiting groove (18).

6. The arc extinguishing and exhaust structure according to claim 5, wherein: A first limiting post (181) located on the bottom wall of the limiting groove (18) and a second limiting post (182) located on the top wall of the limiting groove (18) are arranged in the limiting groove (18). The second limiting post (182) is arranged in a dislocation manner with respect to the first limiting post (181) in a direction close to the second channel (14). The fixing part (31) includes a first straight section (311), a second straight section (312) and a bending section (313) connected in sequence. The first straight section (311) is vertically connected to the second straight section (312). The first straight section (311) is limited between the first limiting post (181) and the top wall of the limiting groove (18). The second straight section (312) is limited between the first limiting post (181) and the second limiting post (182). The bending section (313) is limited between the second limiting post (182) and the bottom wall of the limiting groove (18) and is connected to the movable part (32).

7. The arc extinguishing and exhaust structure according to claim 1, characterized in that: An arc ignition piece (8) is further included. The arc ignition piece (8) extends from the bottom of the contact mechanism along the bottom wall of the accommodation chamber (12) to below the arc extinguishing chamber (2). The arc ignition piece (8) has a raised part (81) that bulges upward to the incoming arc side of the arc extinguishing chamber (2).

8. The arc extinguishing and exhaust structure according to claim 1, characterized in that: The contact mechanism includes a static contact (4), a moving contact (5), a contact support (6), and a contact spring (7) that provides contact pressure for the moving contact (5). The moving contact (5) is provided with a moving contact point (51) for cooperating with the static contact point (41) of the static contact (4). The moving contact (5) is installed at one end of the contact support (6), and the other end of the contact support (6) is provided with a driven rod (62) that extends out of the housing (1).

9. The arc extinguishing and exhaust structure according to claim 8, characterized in that: The contact mechanism is provided with two static contacts (4). The two static contacts (4) are symmetrically arranged on the top wall of the accommodation chamber (12). An installation through cavity (61) is provided at one end of the contact support (6). The moving contact (5) is of a bridge structure. The moving contact (5) is inserted into the installation through cavity (61), with both ends extending out of the installation through cavity (61) and located below the static contacts (4). One moving contact point (51) is provided at each of the two ends of the moving contact (5), respectively cooperating with the static contact points (41) of the two static contacts (4). The arc extinguishing and exhaust structure includes two arc extinguishing chambers (2) symmetrically arranged on both sides of the contact mechanism. Exhaust ports (11) are provided on each of the two opposite side walls of the housing (1). The static contact (4) is provided with an arc guiding angle (42), and the arc guiding angle (42) extends from the static contact point (41) to above the arc extinguishing chamber (2).

10. Switching device, characterized in that: It includes the arc extinguishing and exhaust structure according to any one of claims 1-9.

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