Contact arc extinguishing structure of switch

Abstract

A contact arc extinguishing structure of a switch comprises a contact system and an arc extinguishing chamber, the contact system comprises a moving contact and a static contact, the moving contact comprises a contact support, an airflow blocking structure fixed on the contact support, and a first contact piece and a second contact piece which are arranged on the contact support, a baffle portion of the airflow blocking structure is located on one side, close to the static contact, of the first contact piece, and is characterized by further comprising a partition plate, an open groove corresponding to the partition plate is formed in the contact support, and the partition plate extends downwards from the open side of an arc channel of the arc extinguish chamber and is matched with the baffle portion; in the connecting line direction of the moving contact and the static contact, the spacing plate extends from the static contact to the moving contact and is inserted into the corresponding open slot, so that the first contact piece corresponding to the arc channel is isolated from the second contact piece located on the outer side of the arc channel in the whole switching-on and switching-off process. The arc extinguishing chamber has the advantages that arc gas generated in the arc extinguishing chamber can be prevented from being in contact with the contact piece on the moving contact, and the breaking capacity of the switch is improved while the contact piece is protected.

Description

Technical Field

[0001] The utility model belongs to the technical field of switches, and particularly relates to an arc extinguishing structure for the contact of a switch. Background Art

[0002] When the moving and static contacts in a switch are separated, an arc will be generated. If the arc is not quickly extinguished, it may cause safety accidents. Therefore, a reliable arc extinguishing structure for the contacts needs to be configured in the switch to quickly extinguish the arc, so as to protect the load.

[0003] For high-current switches, the contact system usually uses a contact mechanism with multiple contact pieces. To improve the breaking capacity, at least one arcing contact piece is usually provided. On the one hand, the arcing contact point separates later than other moving contacts, so that only the arcing contact has an arc when the current is interrupted, and no arc is generated on other moving contacts. On the other hand, the arcing contact is extended into the arc extinguishing chamber with a narrow slit, and while stretching the arc, the narrow slit effect is used to squeeze the arc and burn the gas-producing material to extinguish the arc. However, with the increase of the breaking capacity, some high-temperature free gas overflows backward from the narrow slit, resulting in an arc between the moving and static contacts of adjacent phases, thus affecting the breaking capacity.

[0004] In the prior art, for example, the Chinese Utility Model Patent Authorization Publication No. CN213400999U, titled "A Breaking Device", discloses that a baffle is provided on the moving contact, and during the closing and opening process, the baffle always cooperates with the base to close the side of the moving contact close to the static contact to prevent arc gas from passing through. However, this technical solution does not isolate the contact pieces on the moving contact, resulting in arc gas passing through the contact pieces, which will also affect the breaking capacity. Content of the Utility Model

[0005] The purpose of the utility model is to provide an arc extinguishing structure for the contact of a switch, which can prevent the arc gas generated in the arc extinguishing chamber from contacting the contact pieces on the moving contact, thereby protecting the contact pieces and improving the breaking capacity of the switch at the same time.

[0006] The object of the present utility model is achieved in the following way. An arc extinguishing structure for the contact of a switch includes a contact system and an arc extinguishing chamber. The contact system includes a moving contact and a static contact. The moving contact includes a contact support, an air flow blocking structure fixed on the contact support, and a first contact piece and a second contact piece rotatably arranged on the contact support. The baffle part of the air flow blocking structure is located on one side of the first contact piece close to the static contact. It further includes a spacer plate. An opening groove corresponding to the spacer plate is provided on the contact support. The spacer plate extends downward from the opening side of the arc channel of the arc extinguishing chamber and cooperates with the baffle part. In the direction of the connection line between the moving contact and the static contact, the spacer plate extends from the static contact to the moving contact and is inserted into the corresponding opening groove, so that during the entire closing and opening process, the first contact piece corresponding to the arc channel is isolated from the second contact piece located outside the arc channel.

[0007] In a specific embodiment of the present utility model, there are multiple second contact pieces, which are divided into two groups and are located on both sides of the first contact piece. The spacer plate and the opening groove are both a pair. The pair of spacer plates extend downward from both sides of the opening of the arc channel of the arc extinguishing chamber and cooperate with the baffle part.

[0008] In another specific embodiment of the present utility model, the first contact piece and the second contact piece are two groups arranged in a side-by-side array. The spacer plate and the opening groove are both one. The spacer plate is inserted into the opening groove.

[0009] In yet another specific embodiment of the present utility model, the switch further includes a housing. A contact accommodating cavity is formed inside the housing. The contact system is placed in the contact accommodating cavity. A mating surface is provided inside the housing. The mating surface cooperates with the baffle part to prevent the arc gas from flowing downward from this place.

[0010] In still another specific embodiment of the present utility model, a moving arc contact is provided on the first contact piece, and a moving main contact is provided on the second contact piece. The static contact includes a conductive block. A static arc contact and a static main contact are provided on the conductive block. The moving arc contact corresponds to the static arc contact, and the moving main contact corresponds to the static main contact. The opening of the opening groove is located at the top of the rotating end of the contact support.

[0011] In still another specific embodiment of the present utility model, the arc extinguishing chamber includes a pair of side plates and grid sheets arrayed between the pair of side plates. The grid sheets include grid legs located on both sides of the grid sheet body. The grid legs extend towards the contact system. The moving arc contact extends past the grid legs, and the moving main contact is located outside the arc extinguishing chamber.

[0012] In a further specific embodiment of the present utility model, a gas generating member is provided inside the two grid piece legs, and the spacer plate is integrally provided with the gas generating member.

[0013] In a still further specific embodiment of the present utility model, the spacer plate is mounted on the static contact, and the spacer plate further includes a bridging portion located between a pair of spacer plates and connecting the two spacer plates. The spacer plate further includes a fitting portion that fits on the side surface of the lower side of the conductive block.

[0014] In yet a further specific embodiment of the present utility model, the baffle portion is provided with ridges that are embedded between the pair of spacer plates.

[0015] In yet a still further specific embodiment of the present utility model, a contact spring is further accommodated on one side of the contact support close to the first contact piece and the second contact piece. One end of the contact spring extending out of the contact support abuts against the first contact piece and the second contact piece, and the pair of spacer plates separate the contact spring on the first contact piece from the contact spring on the second contact piece.

[0016] Due to the adoption of the above structure, the present utility model has the beneficial effects as follows: An opening groove is provided on the contact support of the moving contact. The spacer plate extends from the arc channel side of the arc extinguishing chamber towards the contact system. In the direction of the connection line between the moving contact and the static contact, the spacer plate extends from the static contact towards the moving contact and is inserted into the corresponding opening groove, so that during the entire process of closing and opening the moving contact, the spacer plate can separate the first contact piece from the second contact piece, preventing the arc gas generated in the arc extinguishing chamber from contacting the second contact piece and protecting the contact spring on the second contact piece. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Schematic diagram of the arc extinguishing chamber and the contact system in the first embodiment related to the present utility model;

[0018] Figure 2 Schematic diagram of the moving contact in the first embodiment related to the present utility model;

[0019] Figure 3 Schematic diagram of the static contact in the first embodiment related to the present utility model;

[0020] Figure 4 Schematic diagram of the arc extinguishing chamber in the first embodiment related to the present utility model;

[0021] Figure 5 Schematic diagram of the grid piece in the first embodiment related to the present utility model;

[0022] Figure 6Cross-sectional view of the arc extinguishing chamber in the first embodiment related to the present utility model;

[0023] Figure 7 Schematic diagram of the cooperation between the arc extinguishing chamber and the moving contact in the first embodiment related to the present utility model;

[0024] Figure 8 Side cross-sectional view of the circuit breaker when the contact is in the closed state in the first embodiment related to the present utility model;

[0025] Figure 9 Side cross-sectional view of the circuit breaker when the contact is in the separated state in the first embodiment related to the present utility model;

[0026] Figure 10 Schematic diagram of the static contact in the second embodiment related to the present utility model;

[0027] Figure 11 Schematic diagram of the moving contact in the third embodiment related to the present utility model;

[0028] Figure 12 Schematic diagram of the static contact in the third embodiment related to the present utility model;

[0029] Figure 13 Schematic diagram of one side of the arc extinguishing chamber and the contact system in the fourth embodiment related to the present utility model;

[0030] Figure 14 Schematic diagram of the other side of the arc extinguishing chamber and the contact system in the fourth embodiment related to the present utility model;

[0031] In the figure: 1. Arc extinguishing chamber, 11. Side plate, 12. Grid piece, 121. First grid piece, 122. Second grid piece, 123. Third grid piece, 124. Fourth grid piece, 13. Arc extinguishing chamber cover, 14. Gas generating part, 15. Spacer plate, 151. Bridging part, 152. Fitting part, 16. Moving arcing piece; 2. Moving contact, 21. Moving contact piece, 211. First contact piece, 2111. Moving arc contact point, 212. Second contact piece, 2121. Moving main contact point, 22. Contact support, 221. Open slot, 23. Airflow blocking structure, 231. Baffle part, 2311. Ridge, 232. Mounting part, 233. Connecting part, 234. Blocking part; 3. Static contact, 31. Conductive block, 311. Side surface, 32. Static arc contact point, 33. Static main contact point; 4. Housing, 41. Base, 42. Bottom plate, 421. Fitting surface. Detailed description of the specific implementation mode

[0032] The following will describe in detail the specific implementation mode of the present utility model in conjunction with the accompanying drawings. However, the description of the embodiments is not a limitation of the technical solution. Any change in form rather than substance based on the concept of the present utility model should be regarded as the protection scope of the present utility model.

[0033] In the following description, the concepts of directionality (or orientation) such as up, down, left, right, front, and back are all with respect to the position state of the figure being described, aiming to facilitate public understanding. Therefore, they should not be construed as special limitations on the technical solutions provided by the present utility model. Embodiment 1

[0034] As Figures 1 to 9 is a schematic diagram of the first embodiment. The switch includes a contact system and an arc extinguishing chamber 1 located in the opening direction of the contact system. The switch further includes an operating mechanism (not shown), a housing 4. The contact system includes a moving contact 2 and a static contact 3. The moving contact 2 is rotatably arranged, and the moving contact 2 realizes contact or separation with the fixed static contact 3 through rotation. The bus bar on the moving contact 2 directly extends out of the housing for wiring, while the static contact 3 realizes wiring through a connecting row.

[0035] The housing 4 includes a base 41 and a bottom plate 42, and the two are spliced to form a housing 4. A contact accommodating cavity is formed inside the housing 4. The contact system is placed in the contact accommodating cavity, and the arc extinguishing chamber 1 is located at the opening above the contact accommodating cavity. The moving contact 2 is installed on the base 41, while the static contact 3 is installed on the bottom plate 42. The operating mechanism is used to drive the moving contact 2 to act, realizing contact or separation with the static contact 3.

[0036] Continue to see Figure 2 , the moving contact 2 includes a moving contact piece 21, a contact support 22, and an air flow blocking structure 23. There are multiple moving contact pieces 21, which are rotatably arranged on the contact support 22. The air flow blocking structure 23 is fixedly installed on the contact support 22. The air flow blocking structure 23 is located on the side of the moving contact piece 21 close to the static contact 3. The moving contact piece 21 includes a first contact piece 211 and a second contact piece 212. There is at least one first contact piece 211. In this embodiment, there are two first contact pieces 211. The second contact piece 212 is multiple and is divided into two groups and is located on both sides of the first contact piece 211. The head of the first contact piece 211 extends beyond the head of the second contact piece 212 and extends outward.

[0037] A contact spring (not shown) is also accommodated on the side of the contact support 22 close to the first contact piece 211 and the second contact piece 212. One end of the contact spring extending out of the contact support 22 abuts against the first contact piece 211 and the second contact piece 212, providing contact pressure for the two.

[0038] The first contact piece 211 has a moving arc contact 2111. Similarly, the second contact piece 212 has a moving main contact 2121. The moving arc contact 2111 is located outside the moving main contact 2121 in the extending direction of the moving contact piece 21.

[0039] The airflow blocking structure 23 includes a baffle part 231, a mounting part 232, a connecting part 233 and a shielding part 234. The baffle part 231 extends from the moving contact 2 towards the static contact 3. The mounting parts 232 are a pair and are used to fit with both sides of the contact support 22 to install the airflow blocking structure 23 onto the contact support 22. The connecting part 233 connects the pair of mounting parts 232, and the two form a U shape. The shielding parts 234 are also a pair. The shielding parts 234 contact the contact support 22 and are located on both sides of the baffle part 231 close to the contact support 22.

[0040] As Figure 3 , the static contact 3 includes a conductive block 31. A static arc contact 32 and a static main contact 33 are arranged on the conductive block 31. In this embodiment, the position of the static arc contact 32 is closer to the arc extinguishing chamber 1 than that of the static main contact 33. The static arc contact 32 is one, while the static main contacts 33 are two and are distributed in a "pin" shape. Among them, the static arc contact 32 is located in the middle of the two static main contacts 33.

[0041] As Figure 1 , the arc extinguishing chamber 1 includes a pair of side plates 11 and grid sheets 12 arranged in an array between the pair of side plates 11. The arc extinguishing chamber 1 further includes an arc extinguishing chamber cover 13, and the arc extinguishing chamber cover 13 is located at the top of the arc extinguishing chamber 1.

[0042] The grid sheets 12 include grid legs on both sides of the grid sheet 12 body, and the grid legs extend towards the contact system. A gas generating part 14 is arranged inside the two grid legs, and the gas generating part 14 and the side plate 11 jointly cover the grid legs. An arc channel is formed between the two gas generating parts 14. An extended spacer 15 is further arranged on the arc extinguishing chamber 1. The spacer 15 is located outside the arc extinguishing chamber 1 and corresponds to the opening of the narrow slit of the arc extinguishing chamber 1, and the spacer 15 extends towards the moving contact 2.

[0043] The arc extinguishing chamber 1 further includes a moving arcing piece 16. One end of the moving arcing piece 16 is arranged parallel to the grid sheet 12, and the other end extends towards the inside of the arc extinguishing chamber 1 and is arranged in cooperation with the first contact piece 211.

[0044] In this embodiment, the head of the first contact piece 211 extends into the interior of the arc extinguishing chamber 1 and passes through the grid piece legs. The moving arc contact point 2111 on the first contact piece 211 follows the first contact piece 211 to pass through the grid piece legs and is located in the arc channel. The second contact piece 212 is located outside the arc extinguishing chamber 1, and the moving main contact point 2121 thereon is also located outside the arc extinguishing chamber 1.

[0045] As Figure 5 , the grid pieces 12 include a first grid piece 121, a second grid piece 122, a third grid piece 123, and a fourth grid piece 124. Among them, the first grid piece 121 is a plurality of pieces arrayed in a group and is located at one end of the entire grid piece 12 group far from the static contact 3; the second grid piece 122 is also a plurality of pieces arrayed in a group and is located on the side of the first grid piece 121 group close to the static contact 3; the third grid piece 123 is a plurality of pieces arrayed in two groups, and both groups of the third grid piece 123 are located on the side of the second grid piece 122 group close to the static contact 3; the fourth grid piece 124 is also a plurality of pieces arrayed in a group and is located between the two groups of the third grid piece 123.

[0046] In the height direction of the arc extinguishing chamber 1, the notch of the first grid piece 121 is at the same height as the notch of the second grid piece 122. The notch of the third grid piece 123 is located below the notch of the first grid piece 121, and the notch of the fourth grid piece 124 is located below the notch of the third grid piece 123.

[0047] The grid piece legs of the first grid piece 121 are shorter than those of other grid pieces.

[0048] As Figure 6 , in this embodiment, the spacer plate 15 is integrally provided with the gas generating member 14. Preferably, the spacer plate 15 is flush with the flat plate portion of the gas generating member 14 located inside the grid piece legs.

[0049] As Figure 2 、 Figure 7 , at the top of the rotating end of the contact support 22, a pair of spaced-apart opening grooves 221 are provided, that is, the openings of the opening grooves 221 are located at the top of the rotating end of the contact support 22. The opening grooves 221 correspond to the position between the first contact piece 211 and the second contact piece 212. The opening grooves 221 are used for the spacer plate 15 to penetrate into.

[0050] Preferably, the gas generating member 14 further includes a transverse baffle plate that wraps the end of the grid piece leg, and the transverse baffle plate blocks between the end of the grid piece leg and the moving contact.

[0051] As Figure 8 、Figure 9 , which is a schematic diagram when the contact system is in the closed state and the open state. Specifically, see Figure 8 , when the contact system is in the closed state, the moving arcing contact 2111 contacts the static arcing contact 32, and the moving main contact 2121 contacts the static main contact 33.

[0052] A mating surface 421 is provided on the bottom plate 42, and the mating surface 421 cooperates with the baffle portion 231 to prevent arc gas from flowing downward from this place.

[0053] Such as Figure 9 , when the contact system is in the open state, the moving arcing contact 2111 is separated from the static arcing contact 32, and the moving main contact 2121 is separated from the static main contact 33. And because the separation of the moving arcing contact 2111 from the static arcing contact 32 is later than the separation of the moving main contact 2121 from the static main contact 33, an arc is generated between the moving arcing contact 2111 and the static arcing contact 32.

[0054] Preferably, when in the open state, the mating surface 421 still cooperates with the baffle portion 231, that is, the two are staggered. Therefore, during the entire process of closing and opening of the contact system, the arc gas can always be blocked from moving downward from this place. Embodiment 2

[0055] Such as Figure 10 is a schematic diagram of the static contact 3 and the spacer 15 in the second embodiment. At this time, the spacer 15 is installed on the static contact 3. In this embodiment, the spacer 15 further includes a bridging portion 151, and the bridging portion 151 is located between a pair of spacers 15 and connects the two spacers 15 to ensure the spaced arrangement of the two spacers 15. The spacer 15 further includes a fitting portion 152, and the fitting portion 152 fits on the side surface 311 under the conductive block 31. At this time, the positional relationship between the spacer 15 and the arc extinguishing chamber 1 is determined after the installation of the static contact 3 is completed, but still maintains the same position as in the first embodiment. Embodiment 3

[0056] Such as Figure 11 、 Figure 12 is a schematic diagram of the third embodiment. Specifically, see Figure 11 , which is a schematic diagram of the moving contact 2. The difference between the moving contact 2 at this time and the first embodiment is as follows: First, the moving arcing contact 2111 on the first contact piece 211 and the moving main contact 2121 on the second contact piece 212 are at the same height in the extending direction of the contact piece. Second, a rib 2311 is provided on the baffle portion 231, and the rib 2311 is embedded between the pair of spacers 15.

[0057] As Figure 12 On the static contact 3, there are also the static arc contact 32 and the static main contact 33 as described above. There is one static arc contact 32 and two static main contacts 33. The static arc contact 32 and the static main contacts 33 are arranged side by side, and the static arc contact 32 is located between the two static main contacts 33.

[0058] In the embodiment, the spacer 15 extends down to the baffle portion 231. The baffle portion 231 is located on the side of the moving main contact 2121 away from the arc extinguishing chamber 1, that is, the baffle portion 231 is located on the side of the static main contact 33 away from the arc extinguishing chamber 1. The pair of spacers 15 are located on both sides of the moving arc contact 2111, separating the moving arc contact 2111 from the moving main contact 2121. Since one side of the spacer 15 close to the contact support 22 is inserted into the opening groove 221, the pair of spacers 15 simultaneously separate the contact springs on the first contact piece 211 from the contact springs on the second contact piece 212, thereby protecting the contact springs on the second contact piece 212.

[0059] Preferably, both the baffle portion 231 and the mating surface 421 are arc-shaped and cooperate with each other. Similarly, the lower edge of the spacer 15 that cooperates with the baffle portion 231 also has an arc-shaped outer edge. Embodiment 4

[0060] As Figure 13 、 Figure 14 As a schematic diagram of the fourth embodiment, the difference from the first embodiment is that the first contact piece 211 and the second contact piece 212 are two sets arranged side by side in an array, that is, one set of the first contact pieces 211 is located on one side, and the other set of the second contact pieces 212 is located on the other side.

[0061] Only one opening groove 221 is provided at the top of the rotating end of the contact support 22. Correspondingly, there is also one spacer 15, which is inserted into the opening groove 221, that is, the isolation between the first contact piece 211 and the second contact piece 212 can be achieved.

[0062] In the present utility model, the opening groove 221 and the spacer 15 are in insertion fit, so that during the entire process of closing and opening the moving contact 2, the spacer 15 can always separate the first contact piece 211 from the second contact piece 212, prevent the arc gas generated in the arc extinguishing chamber from contacting the second contact piece 212, and protect the contact springs on the second contact piece 212.

Claims

1. An arc extinguishing structure for the contact of a switch, comprising a contact system and an arc extinguishing chamber (1). The contact system includes a moving contact (2) and a static contact (3). The moving contact (2) includes a contact support (22), an air flow blocking structure (23) fixed on the contact support (22), and a first contact piece (211) and a second contact piece (212) rotatably arranged on the contact support (22). The baffle portion (231) of the air flow blocking structure (23) is located on the side of the first contact piece (211) close to the static contact (3). It is characterized in that: It further includes a spacer (15). An opening groove (221) corresponding to the spacer (15) is provided on the contact support (22). The spacer (15) extends downward from the opening side of the arc passage of the arc extinguishing chamber (1) and cooperates with the baffle portion (231); in the direction of the connection line between the moving contact (2) and the static contact (3), the spacer (15) extends from the static contact (3) towards the moving contact (2) and is inserted into the corresponding opening groove (221), so that during the entire closing and opening process, the first contact piece (211) corresponding to the arc passage is isolated from the second contact piece (212) located outside the arc passage.

2. The arc extinguishing structure of the contact of a switch according to claim 1, characterized in that: There are multiple second contact pieces (212), which are divided into two groups and are located on both sides of the first contact piece (211); both the spacer (15) and the opening groove (221) are in pairs. The pair of spacers (15) extend downward from both sides of the opening of the arc passage of the arc extinguishing chamber (1) and cooperate with the baffle portion (231).

3. The arc extinguishing structure of the contact of a switch according to claim 1, characterized in that: The first contact piece (211) and the second contact piece (212) are two groups arranged side by side in an array. Both the spacer (15) and the opening groove (221) are one. The spacer (15) is inserted into the opening groove (221).

4. The arc extinguishing structure of the contact of a switch according to claim 1, characterized in that: The switch further includes a housing (4). A contact accommodating cavity is formed inside the housing (4). The contact system is placed in the contact accommodating cavity. A mating surface (421) is provided inside the housing (4). The mating surface (421) cooperates with the baffle portion (231) to prevent the arc gas from flowing downward from this place.

5. The arc extinguishing structure of the contact of a switch according to claim 1, characterized in that: The first contact piece (211) has a moving arc contact point (2111), and the second contact piece (212) has a moving main contact point (2121); the static contact (3) includes a conductive block (31). A static arc contact point (32) and a static main contact point (33) are provided on the conductive block (31). The moving arc contact point (2111) corresponds to the static arc contact point (32), and the moving main contact point (2121) corresponds to the static main contact point (33). The opening of the opening groove (221) is located at the top of the rotating end of the contact support (22).

6. The arc extinguishing structure of the contact of a switch according to claim 5, characterized in that: The arc extinguishing chamber (1) includes a pair of side plates (11) and grid plates (12) arranged in an array between the pair of side plates (11); the grid plates (12) include grid legs located on both sides of the grid plate body. The grid legs extend towards the contact system; the moving arc contact point (2111) extends past the grid legs, and the moving main contact point (2121) is located outside the arc extinguishing chamber (1).

7. The arc extinguishing structure of the contact of a switch according to claim 6, characterized in that: A gas generating member (14) is provided inside the two grid legs. The spacer (15) is integrally provided with the gas generating member (14).

8. The arc extinguishing structure of the contact of a switch according to claim 5, characterized in that: The spacer (15) described above is installed on the static contact (3). The spacer (15) further includes a bridging portion (151). The bridging portion (151) is located between a pair of spacers (15) and connects the two spacers (15). The spacer (15) further includes a fitting portion (152). The fitting portion (152) fits on the side surface (311) of the lower side of the conductive block (31).

9. The arc extinguishing structure of the contact of a switch according to claim 2, characterized in that: The baffle portion (231) is provided with a rib (2311). The rib (2311) is embedded between the pair of spacers (15).

10. The arc extinguishing structure of the contact of a switch according to claim 2, characterized in that: A contact spring is further accommodated on one side of the contact support (22) close to the first contact piece (211) and the second contact piece (212). One end of the contact spring extending out of the contact support (22) abuts against the first contact piece (211) and the second contact piece (212). The pair of spacers (15) separates the contact spring on the first contact piece (211) from the contact spring on the second contact piece (212).

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