Isolating switch

Abstract

An isolating switch belongs to the technical field of low-voltage apparatuses. Which comprises a shell, an arc extinguishing device and a contact system, the arc extinguishing device and the contact system are arranged in the shell, the arc extinguishing device is provided with an arc channel extending in the moving direction of a moving contact of the contact system, and an exhaust port is formed in the shell. And the exhaust port is blocked by the baffle plate, so that a bent channel bypassing the baffle plate is formed between the arc channel and the exhaust port. The arc running channel has the advantages that the movement distance of the charged metal particles is prolonged, the contact area of the charged metal particles and the inner wall of the arc running channel is increased, the cooling and deionization effects on the charged metal particles are enhanced by arc extinguishing gas generated by the baffles, and the arc running channel can avoid arc spraying, remarkably improve the safety and is simple in structure.

Description

Technical Field

[0001] The utility model belongs to the technical field of low-voltage electrical appliances, and particularly relates to a disconnector. Background Art

[0002] A disconnector is a switch device mainly used for isolating power sources, switching operations, connecting and disconnecting circuits (low-current circuits) and has a wide range of uses. A common way in its operation mode is to drive a switch operating mechanism through manual operation to make the contact system perform closing and opening actions.

[0003] As is known in the industry, when the arc generated when the moving contact of the contact system structure opens relative to the static contact passes through the arc extinguishing device, the arc is stretched and cooled until it goes out. Usually, an exhaust port is provided on the housing of the disconnector for the high-temperature free gas generated by the arc to be discharged from the exhaust port.

[0004] When the aforementioned high-temperature free gas jets out from the exhaust port, the temperature is as high as thousands of degrees Celsius and the arc jet itself is also conductive. Therefore, the hazards it causes, such as damaging the switch housing, burning the operator, burning the equipment, causing short-circuit faults, explosions and / or fires, are very serious. In view of this, if the temperature of the aforementioned free gas can be reasonably reduced, then it undoubtedly has a positive significance for avoiding arc jets and the above-mentioned hazardous situations and thus ensuring the service life of the switch and electrical safety. The technical solution to be introduced below was generated under this background. Summary of the Utility Model

[0005] The task of the utility model is to provide a disconnector that helps to change the direct injection of arc gas in the prior art to the exhaust port to be discharged from the exhaust port after passing through a tortuous detour path, so as to not only extend the movement distance of charged metal particles, but also increase the contact area with the inner wall of the arc running path, eliminate arc jets, significantly improve safety, and have a simple structure.

[0006] The task of the utility model is completed as follows. A disconnector includes a housing, an arc extinguishing device and a contact system arranged in the housing. The arc extinguishing device has an arc path extending along the movement direction of the moving contact of the contact system. An exhaust port is opened on the housing, and the exhaust port is aligned with the arc path. A baffle made of gas-producing material is arranged in the housing. The baffle blocks the exhaust port to form a bending channel that bypasses along the baffle between the arc path and the exhaust port.

[0007] In the utility model, the arc extinguishing device includes a permanent magnet arranged on the moving plane of the moving contact, a first magnetic conductive plate and a second magnetic conductive plate with the same structure, the cross-sections of the first magnetic conductive plate and the second magnetic conductive plate are both L-shaped and are symmetrically arranged on both sides of the permanent magnet so that the cross-section of the arc extinguishing device is E-shaped, and the space between the permanent magnet and the opposite side of the first magnetic conductive plate and the space between the permanent magnet and the opposite side of the second magnetic conductive plate constitute the arc path.

[0008] In the utility model, the projection of the baffle in the direction toward the exhaust port covers the exhaust port, and the projection of the baffle in the direction toward the arc path covers the arc path.

[0009] In the utility model, the shell is composed of a pair of half shells spliced ​​to each other, and baffle plug-in cavities are respectively provided on the pair of half shells, and two opposite side ends of the baffle are correspondingly plugged into the baffle plug-in cavities.

[0010] In the utility model, the arc extinguishing device further comprises an arc extinguishing cover, which insulates and covers the exterior of the permanent magnet, the first magnetic conductive plate and the second magnetic conductive plate.

[0011] In the utility model, the arc extinguishing hood is made of gas-generating material.

[0012] In the utility model, the gas generating material is an insulating material, and the insulating material is polyoxymethylene or nylon.

[0013] The technical effect of the technical solution provided by the utility model is that: since a baffle made of gas-producing material is arranged between the exhaust port and the arc extinguishing device, the baffle blocks and squeezes out, changing the direct injection channel of the arc gas in the prior art, so that the channel from the arc extinguishing device to the exhaust port becomes a channel with a bent structure, and the charged metal particles formed by the arc detour along the wall of the baffle with a certain length, the movement path of the charged metal particles is elongated, and the contact area with the inner wall of the channel is increased, which is conducive to the extinguishing of the arc; in addition, due to the flow of the charged metal particles along the side wall of the baffle, the baffle produces more arc extinguishing gas, which strengthens the cooling and deionization of the charged metal particles, eliminates the remaining arc between the arc extinguishing device and the exhaust port, avoids arc spraying, ensures the service life of the switch, and significantly improves the safety of electricity use. The exhaust port is opened on the shell aligned with the arc path, and the baffle is inserted inside the shell. The structure is simple, small in space and low in cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the utility model in a state where another housing is removed;

[0015] Figure 2 for Figure 1 The schematic diagram of the arc extinguishing device shown;

[0016] Figure 3 The Figure 1 schematic exploded view of the housing, permanent magnet, and magnetic conductive plate of the arc extinguishing device shown;

[0017] Figure 4 The Figure 1 detailed structure diagram of the baffle shown;

[0018] Figure 5 The Figure 1 schematic diagram of the exhaust passage shown when the baffle and the housing form a split structure;

[0019] Figure 6 The Figure 1 schematic diagram of the exhaust passage shown when the baffle and the housing form an integral structure;

[0020] Figure 7 The Figure 1 partial enlarged schematic view of the outer shell in Specific Embodiment

[0021] Please refer to Figure 1 and in combination with Figure 5 or Figure 6 , which shows the housing 1, the arc extinguishing device 2 and the contact system 3 arranged in the housing 1. The aforementioned arc extinguishing device 2 has an arc path 21 extending along the moving direction of the moving contact of the contact system 3 (which can also be called the "moving track direction"), and an exhaust port 11 is provided on the aforementioned housing 1.

[0022] As the technical key point of the technical solution provided by the present invention: the aforementioned exhaust port 11 is aligned with the aforementioned arc path 21, and a baffle 4 is provided in the aforementioned housing 1. The baffle 4 blocks the aforementioned exhaust port 11, and a bent channel 5 (which can also be called a "zigzag channel", the same hereinafter) that bypasses along the aforementioned baffle 4 is formed between the aforementioned arc path 21 and the aforementioned exhaust port 11.

[0023] Please refer to Figure 7 and in combination with Figure 1 , the aforementioned housing 1 is composed of a pair of half shells 12 spliced together. Figure 1 One of the two half shells is removed in , and the aforementioned exhaust port 11 that forms an integral part is formed on the housing 1 with the overall shape formed after the two half shells are spliced. Of course, a cavity for accommodating the static contact 32 in addition to the aforementioned moving contact 31 and arc extinguishing device 2 is also provided inside the housing 1. That is to say, the housing 1 has a moving contact accommodating cavity, an arc extinguishing device accommodating cavity, and a static contact accommodating cavity, etc.

[0024] The aforementioned moving contact 31 and static contact 32 undoubtedly belong to the components of the structural system of the contact system 3. The moving contact 31 is rotatably arranged in the moving contact accommodating cavity inside the aforementioned housing 1. The moving contact 31 has a moving contact bracket. The operating mechanism belonging to the structural system of the disconnecting switch drives the moving contact bracket to rotate the entire moving contact around the moving contact bracket, thereby realizing the contact or separation between the moving contact 31 and the static contact 32. The moving contact 31 has a pair of moving contacts extending backward from both sides centered on the moving contact rotation center. Correspondingly, the static contact 32 also has a pair of static contacts arranged corresponding to the pair of moving contacts respectively. Each static contact 32 has a static contact guide rod 321 and a static contact fixed on the static contact guide rod 321. The plane where the moving contact and the static contact perform the contact and separation movement is the moving contact movement plane. The path of the contact and separation movement between the moving contact and the static contact is arc-shaped.

[0025] Please refer to Figure 2 and Figure 3 , the aforementioned arc extinguishing device 2 includes a permanent magnet 22 arranged on the moving contact movement plane of the moving contact 31, a first magnetic conduction plate 23 and a second magnetic conduction plate 24 with the same structure. The cross-sections of the first magnetic conduction plate 23 and the second magnetic conduction plate 24 are both L-shaped and symmetrically arranged on both sides of the permanent magnet 22, so that the cross-section of the aforementioned arc extinguishing device 2 is E-shaped ( Figure 3 shown).

[0026] The aforementioned permanent magnet 22 is arranged on the moving contact movement plane and is located outside the moving contact movement path (i.e., the other side opposite to the rotation center). As Figure 3 shown, since the aforementioned first magnetic conduction body 23 and second magnetic conduction body 24 have the same structure and their cross-sections are both L-shaped, one arm of the L-shape is arranged substantially perpendicular to the permanent magnet 22 and the end is in contact with the permanent magnet 22, while the other arm is arranged substantially parallel to the permanent magnet 22.

[0027] Continue to refer to Figure 2 and Figure 3 , the aforementioned arc extinguishing device 2 further includes an arc extinguishing cover 25. The outer part of the aforementioned permanent magnet 22, first magnetic conduction plate 23 and second magnetic conduction plate 24 is insulated and coated by the arc extinguishing cover 25, thereby forming arc blocking plates 252 on both sides and a central arc separating plate 251 on the breaking plane of the moving and static contacts 31, 32. After being coated by the arc extinguishing cover 25, the cross-section of the entire arc extinguishing device 2 is still E-shaped.

[0028] An arc path 21 extending along the moving direction of the moving contact 31 of the contact system 3 is formed between the permanent magnet 22 and the magnetic conduction plate on one side. Specifically, in combination with Figure 2 and Figure 3As can be seen from the schematic diagram, the spaces between the opposite sides of the permanent magnet 22 and the first magnetic conductive plate 23 and between the opposite sides of the permanent magnet 22 and the second magnetic conductive plate 24 constitute the arc channels 21. There are a pair of arc channels 21, which are symmetrically arranged on both sides of the moving contact movement plane. In this embodiment, after the arc extinguishing cover 25 insulates and coats the permanent magnet and the magnetic conductive plate externally, the arc channels 21 are formed between the central partition plate 251 and the arc baffle 252 on one side and between the central partition plate 251 and the arc baffle 252 on the other side. It should be noted that the arc channels 21 described above extend roughly along the movement direction of the moving contact 31 of the contact system 3. In this embodiment, the permanent magnet 22 is rectangular, and the horizontally arranged arms in the L shapes of the magnetic conductive plates 23 and 24 on both sides are also rectangular, so the arc channels shown in the figure are straight. Of course, if the surface of the permanent magnet 22 facing the moving contact is set to be arc-shaped, that is, it is completely arranged along the movement track of the moving contact point, the extending directions of the horizontally arranged arms in the L shapes of the magnetic conductive plates 23 and 24 are completely arc-shaped along the movement track of the moving contact point. At the same time, the wall bodies of the arc extinguishing cover 25 for coating the surface of the permanent magnet 22 facing the moving contact and the wall bodies for coating the horizontally arranged arms in the L shapes of the magnetic conductive plates 23 and 24 extend along the movement track of the moving contact point, then arc channels that are completely arc-shaped like the moving contact movement path can be obtained. The aforementioned permanent magnet 22 is arranged in the central arc partition plate 251 of the arc extinguishing cover 25, which is close to the rotation radius of the moving contact 31, and is used to introduce the arc generated by the moving and static contacts 31 and 32 into the arc channels 21 on both sides. The aforementioned permanent magnet 22, the first magnetic conductive plate 23, the second magnetic conductive plate 24 are tightly fitted with the arc extinguishing cover 25. On the central plane of the aforementioned arc extinguishing cover 25 and outside the permanent magnet 22, there is a buckle 253 for fixing the permanent magnet 22, whose function can replace the cover plate to prevent the permanent magnet 22 from vibrating out of the arc extinguishing cover 25. The aforementioned first magnetic conductive plate 23 and the second magnetic conductive plate 24 are also firmly fixed in the arc extinguishing cover 25 due to the suction force of the permanent magnet, so that the structure can be simplified and the cost can be reduced.

[0029] Please refer to Figure 2 and also refer to Figure 1 and Figure 5 , which reveals the position diagram of the exhaust port 11 and the arc channel 21. The exhaust port 11 is aligned with the aforementioned arc channel 21. The contact system 3 of the present utility model has two pairs of moving and static contact pairs, and two exhaust ports 11 are correspondingly provided. One is opened on the right side wall of the housing 1, below the right static contact, and it is aligned with the arc channel 21 in the right arc extinguishing device 2, that is, it is aligned with the top of the right arc extinguishing device 2; the other is opened on the left side wall of the housing 1, above the left static contact, and it is aligned with the arc channel 21 in the left arc extinguishing device 2, that is, it is aligned with the bottom of the left arc extinguishing device 2.

[0030] Please refer to Figure 4 , Figure 4 which shows the Figure 1 andFigure 5 and Figure 6 The detailed structure diagram of the baffle 4 shown. In Figure 1 , 4 , 5, an embodiment in which the baffle 4 and the housing 1 form a split structure is given. On a pair of half shells 12, baffle insertion cavities 41 are respectively provided correspondingly. The two opposite side ends of the baffle 4 are correspondingly inserted into the baffle insertion cavities 41. Specifically, during assembly, first, the bottom end of the baffle 4 in the height direction in Figure 4 is inserted into the insertion cavity 41 of one half shell 12, and then the other half shell 12 is spliced with this half shell. At this time, the baffle insertion cavity 41 on the other half shell should be inserted with the top end of the baffle 4 in the height direction in Figure 4 .

[0031] The aforementioned baffle 4 is spaced from the aforementioned exhaust port 11 and is located between the first arc channel 21' and the second arc channel 21" and the exhaust port 11 to block the aforementioned exhaust port 11. The aforementioned baffle 4 is perpendicular to the opening direction of the aforementioned exhaust port 11, and its length direction (such as in Figure 5 , 6 , the direction in which the baffle 4 extends downward away from the static contact guide rod 321) extends beyond the opening end of the exhaust port 11 and the bottom 211 of the arc channel, and its width direction (such as in Figure 5 , 6 , the direction perpendicular to the paper surface in the azimuth) extends beyond the first arc channel 21', the second arc channel 21", and the exhaust port 11, so that the projection of the aforementioned baffle 4 in the direction facing the exhaust port 11 covers the exhaust port 11, and the projection in the direction facing the arc channel 21 covers the arc channel 21.

[0032] The magnetic field generated by the permanent magnet 22 corresponds to the arc region generated by the moving and static contacts 31, so that the magnetic field generated by the permanent magnet 22 can guide the arc into the arc channel and stretch it to extinguish. In addition, the arc extinguishing cover 25 in the arc extinguishing device 2, on the one hand, can provide a supporting effect on the permanent magnet 22 through the arc extinguishing cover 25 to facilitate the installation and fixation of the permanent magnet 22 in the housing 1; on the other hand, the narrow slit channel between the middle partition 251 and the arc blocking plates 252 on both sides of the arc extinguishing cover 25 constitutes the channel 21. The narrow slit channel is located on both sides of the permanent magnet 22 and is used for the arc between the moving and static contacts 31, 32 to pass through, so as to cooperate with the magnetic field to further guide and stretch the arc to accelerate its extinguishing.

[0033] The aforementioned baffle 4 is made of gas generating material. In this embodiment, the aforementioned arc extinguishing cover 25 is also made of gas generating material. The aforementioned gas generating material is an insulating material, and the insulating material is polyoxymethylene, or it can also be nylon or other equivalent materials.

[0034] Since the arc extinguishing cover 25 is made of gas-generating material, that is, high-temperature resistant non-magnetic material such as the aforementioned polyformaldehyde or nylon, arc extinguishing gas is generated under the burning of the arc, forming a higher air pressure inside the arc extinguishing chamber. At the same time, the air pressure outside the aforementioned exhaust port 11 is lower. Due to the large air pressure difference, the movement of the arc toward the exhaust port is accelerated.

[0035] Of course, the arc extinguishing device 2 of the utility model is not limited to the structure with permanent magnet 22, first and second magnetic conductive plates 23 and 24 given in the embodiment, but can also be an arc extinguishing device composed of several U-shaped grids stacked at intervals along the moving contact movement path direction. The U-shaped grid cuts the arc, lengthens the arc, increases the arc voltage and thus extinguishes the arc, and the U-shaped inner cavity of the stacked several U-shaped grids constitutes an arc path.

[0036] To sum up, since the baffle 4 made of gas-producing material is arranged between the exhaust port 11 and the arc extinguishing device 2, the baffle 4 blocks and excludes the direct injection channel of the arc gas in the prior art, so that the channel from the arc extinguishing device 2 to the exhaust port 11 becomes a channel with a bent structure, and the charged metal particles formed by the arc detour along the wall of the baffle 4 with a certain length, the movement path of the charged metal particles is elongated, and the contact area with the inner wall of the channel is increased, which is conducive to the extinction of the arc; in addition, due to the flow of the charged metal particles along the side wall of the baffle 4, the baffle 4 produces more arc extinguishing gas, which enhances the cooling and deionization effect on the charged metal particles, eliminates the remaining arc between the arc extinguishing device 2 and the exhaust port 11, avoids arc spraying, and eliminates the possibility of pollution to the outside of the switch and phase breakdown on the outside.

Claims

1. A disconnector, comprising a housing (1), an arc extinguishing device (2) and a contact system (3) arranged in the housing (1), the arc extinguishing device (2) having an arc path (21) extending along the moving direction of a moving contact of the contact system (3), an exhaust port (11) being provided on the housing (1), characterized in that: The exhaust port (11) is aligned with the arc path (21), and a baffle (4) made of a gas-generating material is provided in the shell (1). The baffle (4) blocks the exhaust port (11) and forms a bent channel (5) that detours along the baffle (4) between the arc path (21) and the exhaust port (11).

2. The isolating switch according to claim 1, characterized in that: The arc extinguishing device (2) comprises a permanent magnet (22) arranged on a moving plane of a moving contact (31), a first magnetic conductive plate (23) and a second magnetic conductive plate (24) having the same structure, wherein the cross-sections of the first magnetic conductive plate (23) and the second magnetic conductive plate (24) are both L-shaped and are symmetrically arranged on both sides of the permanent magnet (22) so that the cross-section of the arc extinguishing device (2) is E-shaped, and the space between the permanent magnet (22) and the opposite side of the first magnetic conductive plate (23) and the space between the permanent magnet (22) and the opposite side of the second magnetic conductive plate (24) constitute the arc path (21).

3. The isolating switch according to claim 1, characterized in that: The projection of the baffle plate (4) in the direction toward the exhaust port (11) covers the exhaust port (11), and the projection of the baffle plate (4) in the direction toward the arc path (21) covers the arc path (21).

4. The isolating switch according to claim 1, characterized in that: The housing (1) is composed of a pair of half shells (12) spliced ​​together, baffle plate plug-in cavities (41) are correspondingly provided on the pair of half shells (12), and two opposite side ends of the baffle plate (4) are correspondingly plugged into the baffle plate plug-in cavities (41).

5. The isolating switch according to claim 2, characterized in that: The arc extinguishing device (2) further comprises an arc extinguishing cover (25), and the arc extinguishing cover (25) is used to insulate and cover the exterior of the permanent magnet (22), the first magnetic conductive plate (23) and the second magnetic conductive plate (24).

6. The isolating switch according to claim 5, characterized in that: The arc extinguishing hood (25) is made of gas-generating material.

7. A disconnector according to claim 1 or 6, characterized in that: The gas-generating material is an insulating material, and the insulating material is polyoxymethylene or nylon.

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