CN115985705A - Arc extinguishing chamber exhaust structure and switching device - Google Patents

Abstract

The invention relates to an arc extinguish chamber exhaust structure and a switch electric appliance, wherein the arc extinguish chamber exhaust structure comprises an arc extinguish grid plate component and a substrate, a window used for installing the arc extinguish grid plate component is arranged on the substrate, an exhaust channel is arranged at the edge of the window positioned at the outlet side of the arc extinguish grid plate component, the exhaust channel comprises a first exhaust channel and a second exhaust channel, the first exhaust channel further comprises a first air inlet and a first extending air channel, the second exhaust channel further comprises a second air inlet and a second extending air channel, the first air inlet and the second air inlet are respectively and correspondingly arranged at the outlet sides of a lower half arc extinguish grid plate and an upper half arc extinguish grid plate of the arc extinguish grid plate component, the first extending air channel starts from the first air inlet and extends obliquely upwards, and the second extending air channel starts from the second air inlet and extends obliquely downwards. The arc extinguish chamber has the advantages of higher exhaust speed and more uniform exhaust effect, and the miniaturization of the outline dimension of the circuit breaker and the longer length of the exhaust channel are both considered.

Description

Arc extinguishing chamber exhaust structure and switching device

Technical Field

The invention relates to the field of switching appliances, in particular to an improvement of an arc extinguish chamber exhaust structure.

Background

In a switching electrical appliance such as a circuit breaker, an arc extinguishing chamber is an important unit for extinguishing an arc generated when a moving contact and a static contact are disconnected, generally speaking, when the arc is generated between the moving contact and the static contact, the arc enters the arc extinguishing chamber through the guiding of an arc striking plate, the pushing of air blowing and the like, and arc extinguishing grid pieces are arranged in the arc extinguishing chamber to perform arc extinguishing treatment on the arc. After the arc extinction, the ionized gases and residual arc rushing out from the outlet side of the arc chute pieces need to be discharged out of the circuit breaker through the exhaust passage. The design of the exhaust channel directly influences the discharge efficiency of ionized gas and electric arc in the arc extinguish chamber, the temperature of the arc extinguish chamber, the flashover distance of products and other important safety parameters. Most of the exhaust passages in the prior art are designed to be straight single exhaust passages, so that the external dimension of the circuit breaker needs to be designed to be larger under the condition that the length of the exhaust passages is enough to meet the requirement of cooling gas; or the length of the exhaust channel is shortened due to the external dimension of the circuit breaker, but the defect that the cooling of the gas is not facilitated due to the short exhaust channel is caused. In addition, a single exhaust channel in the prior art is difficult to uniformly exhaust all gases in the arc extinguish chamber space, so that the exhaust efficiency is influenced, and the risk of electric arc reignition is improved.

Disclosure of Invention

Therefore, in order to solve the above problems, the present invention provides an arc extinguish chamber exhaust structure with an optimized structure, and also provides a switching electrical appliance having the arc extinguish chamber exhaust structure based on the arc extinguish chamber exhaust structure.

The invention is realized by adopting the following technical scheme:

the invention provides an arc extinguishing chamber exhaust structure which comprises an arc extinguishing grid plate assembly and a substrate, wherein the arc extinguishing grid plate assembly is formed by arranging a plurality of arc extinguishing grid plates at intervals relatively, the relative arrangement direction of the arc extinguishing grid plates is defined as the vertical direction, a window used for installing the arc extinguishing grid plate assembly is arranged on the substrate, an exhaust channel is arranged on the edge of the window positioned on the outlet side of the arc extinguishing grid plate assembly, the exhaust channel comprises a first exhaust channel and a second exhaust channel, the first exhaust channel further comprises a first air inlet and a first extending air channel, the second exhaust channel further comprises a second air inlet and a second extending air channel, the first air inlet is correspondingly arranged on the outlet side of the lower half arc extinguishing grid plate of the arc extinguishing grid plate assembly, the first extending air channel starts from the first air inlet and extends upwards in an inclined mode, the second air inlet is correspondingly arranged on the outlet side of the upper half arc extinguishing grid plate of the arc extinguishing grid plate assembly, and the second extending downwards from the second air inlet.

Preferably, the base plate comprises a first side plate surface and a second side plate surface which are different from each other, the first air inlet and the first extending air passage are arranged on the first side plate surface, and the second air inlet and the second extending air passage are arranged on the second side plate surface.

Preferably, the window is formed by connecting a plurality of window walls end to end, and two diagonally arranged notches are arranged on one of the window walls corresponding to the outlet sides of the arc chute blade assemblies and are respectively used as the first air inlet and the second air inlet.

Preferably, the first side plate surface is relatively located on the right side of the substrate, the second side plate surface is relatively located on the left side of the substrate, the right half arc-extinguishing grid plate of the arc-extinguishing grid plate component corresponds to the first air inlet, and the left half arc-extinguishing grid plate of the arc-extinguishing grid plate component corresponds to the second air inlet.

Preferably, the first extending air passage and/or the second extending air passage are/is a zigzag-shaped passage or an arc-shaped passage.

Preferably, the first extending air passage and the second extending air passage are two-section broken line-shaped passages, the first extending air passage extends obliquely upwards and then vertically upwards, and the second extending air passage extends obliquely downwards and then vertically downwards.

Preferably, the first exhaust passage and/or the second exhaust passage are provided with at least two passages in parallel.

Preferably, a guide plate inclined to the inner wall of the channel is arranged on the inner wall of the channel of the first extending air channel and/or the second extending air channel; the diversion plate is gradually far away from the inner wall of the channel from the upstream direction to the downstream direction of the first extended air flue or the second extended air flue.

The embodiment also provides a switching device, which comprises a movable contact and a fixed contact used for controlling the connection or disconnection of a circuit, and an arc extinguish chamber used for extinguishing arc generated when the movable contact and the fixed contact are disconnected, wherein the arc extinguish chamber comprises the arc extinguish chamber exhaust structure.

Wherein, preferably, the switching device is a circuit breaker.

Wherein, preferentially, the circuit breaker is bipolar circuit breaker, including the electrically conductive system of the L utmost point, the electrically conductive system of N utmost point, base and first side cap joint relatively in order to form the installation the inner space of the electrically conductive system of the L utmost point and N utmost point, the base plate is located in order to separate between base and the first side cap the electrically conductive system of the L utmost point and the electrically conductive system of N utmost point, the electrically conductive system of the L utmost point includes the explosion chamber, the electrically conductive system of N utmost point is equipped with third exhaust passage.

Preferably, the relative joint direction of the base and the first side cover is defined as a left-right direction, wherein the first side cover is relatively arranged on the left side of the base, and the base is relatively arranged on the right side of the first side cover; the downstream of the first extending air passage is also communicated with a first air outlet passage, the first air outlet passage extends leftwards to discharge air from the left end face of the first side cover, the downstream of the second extending air passage is also communicated with a second air outlet passage, and the second air outlet passage extends leftwards to discharge air from the left end face of the first side cover.

Preferably, the third exhaust passage also vents from the left end face of the first side cover.

Preferably, the outer angle of the joint of the first extending air passage and the first air outlet passage is an arc chamfer or an inclined chamfer, and the outer angle of the joint of the second extending air passage and the second air outlet passage is an arc chamfer or an inclined chamfer.

Preferably, the exhaust passage has a passage chamber wall formed on the base plate, the base and the first side cover, and the exhaust passage is formed by joining the base plate and the base and the first side cover on both sides of the base plate.

The invention has the following beneficial effects: according to the invention, the first air inlet is correspondingly arranged at the lower half part of the arc-extinguishing grid plate assembly, the second air inlet is correspondingly arranged at the upper half part of the arc-extinguishing grid plate assembly, and the lower half arc-extinguishing grid plate and the upper half arc-extinguishing grid plate of the arc-extinguishing grid plate assembly can be respectively exhausted, so that the exhaust speed of the arc-extinguishing chamber is higher, and the exhaust effect is more uniform. The first extending air passage extends obliquely upwards, the second extending air passage extends obliquely downwards, the length of the exhaust passage is prolonged by the obliquely extending air passage, the gas cooling effect is enhanced, the first extending air passage and the second extending air passage are in crossed arrangement, the internal space of the circuit breaker is compactly utilized, compared with the conventional exhaust passage structure extending in the length direction of the circuit breaker, the circuit breaker can occupy the length space of the circuit breaker as little as possible, and the miniaturization of the external dimension of the circuit breaker and the longer length of the exhaust passage are both considered.

Drawings

Fig. 1 is a schematic perspective view of a circuit breaker according to an embodiment;

fig. 2 is an exploded view of the structure of the circuit breaker in the embodiment;

fig. 3 is a top view of the circuit breaker of the embodiment;

FIG. 4 isbase:Sub>A cross-sectional view taken at A-A of FIG. 3 to show the first inlet port and the first extended gas duct on the right side of the base plate;

FIG. 5 is a left side view of the circuit breaker with the first side cover removed to show the second inlet and the second extended air path on the left side of the base plate in an embodiment;

fig. 6 is a left side view of the circuit breaker in the embodiment;

FIG. 7 is a cross-sectional view taken at B-B of FIG. 6;

FIG. 8 is a schematic perspective view (angle one) of the substrate in the example;

FIG. 9 is a schematic perspective view (angle two) of the substrate in the example.

Detailed Description

To further illustrate the various embodiments, the invention provides the accompanying drawings. The accompanying drawings, which are incorporated in and constitute a part of this disclosure, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the embodiments. Those skilled in the art will appreciate still other possible embodiments and advantages of the present invention with reference to these figures. The components in the drawings are not necessarily to scale, and similar reference numerals are generally used to identify similar components.

The invention will now be further described with reference to the accompanying drawings and detailed description.

Referring to fig. 1 and 2, as a preferred embodiment of the present invention, there is provided a circuit breaker, which is a bipolar circuit breaker, including a case, an L-pole conductive system 10 and an N-pole conductive system 20, wherein the case further includes a base 2 and a first side cover 1 and a second side cover 3 respectively coupled to two sides of the base 2, the first side cover 1 and the base 2 are coupled to each other to form an internal space for installing the L-pole conductive system 10 and the N-pole conductive system 20, and the second side cover 3 and the base 2 are coupled to each other to form an internal space for installing a control unit 30, in which the control unit 30 includes an electromagnetic trip and a trip mechanism. A substrate 4 is fixedly installed between the first side cover 1 and the base 2, and an L-pole conductive system 10 and an N-pole conductive system 20 are separated by the substrate 4. The L-pole conductive system 10 includes an arc-extinguishing chamber 6 (see fig. 5), the arc-extinguishing chamber 6 includes an arc-extinguishing grid plate assembly 5, and the arc-extinguishing grid plate assembly 5 is formed by arranging a plurality of arc-extinguishing grid plates at intervals. For convenience of description, in the present embodiment:

the relative arrangement direction of the arc-extinguishing bars is taken as the up-down direction, which is also the height direction of the breaker, i.e. the direction of "Y1-Y2" in FIG. 2 is taken as the up-down direction, wherein the direction of Y1 is upward, and the direction of Y2 is downward;

the relative joint direction of the base 2 and the first side cover 1 is the left-right direction, which is the width direction of the circuit breaker, wherein the first side cover 1 is located on the left side of the base 2, the base 2 is located on the right side of the first side cover 1, that is, the X1 direction in fig. 2 is toward the left, and the X2 direction is toward the right.

Referring to fig. 2 and 4-9, the substrate 4 is provided with a window 41 for installing the arc chute assembly 5, an exhaust channel for exhausting arc and ionized gas is provided at an edge of the window 41 at a gas outlet side of the arc chute assembly 5 (i.e., a downstream side of the arc chute assembly 5 on a gas traveling path in the arc chamber), the exhaust channel includes a first exhaust channel 71 and a second exhaust channel 72, the first exhaust channel 71 further includes a first gas inlet 710 and a first extended gas channel 711, the second exhaust channel 72 further includes a second gas inlet 720 and a second extended gas channel 721, the first gas inlet 710 is correspondingly provided at an outlet side of a lower half arc chute of the arc chute assembly 5, the first extended gas channel 711 starts from the first gas inlet 710 and extends obliquely upward, the second gas inlet 720 is correspondingly provided at an outlet side of an upper half arc chute of the arc chute assembly 5, and the second extended gas channel 721 starts from the second gas inlet 720 and extends obliquely downward. In this embodiment, the first air inlet 710 is correspondingly disposed at the lower half portion of the arc chute plate assembly 5, and the second air inlet 720 is correspondingly disposed at the upper half portion of the arc chute plate assembly 5, so as to exhaust the lower half portion and the upper half portion of the arc chute plate assembly 5, respectively, so that the exhaust speed of the arc chute is faster, and the exhaust effect is more uniform. The first extending air duct 711 extends obliquely upwards, the second extending air duct 721 extends obliquely downwards, the obliquely extending air ducts contribute to lengthening the length of the exhaust channel and enhancing the gas cooling effect, the first extending air duct 711 and the second extending air duct 721 are in a crossed layout, the internal space of the circuit breaker is compactly utilized, compared with a conventional exhaust channel structure extending in the length direction of the circuit breaker (the direction perpendicular to the vertical direction and the horizontal direction is the length direction of the circuit breaker), the circuit breaker can occupy the length space of the circuit breaker as little as possible, and the miniaturization of the external dimension of the circuit breaker and the longer length of the exhaust channel are both considered.

The substrate 4 includes a first side plate 401 and a second side plate 402, the first side plate 401 is located on the right side of the substrate 4, the second side plate 402 is located on the left side of the substrate 4, the first air inlet 710 and the first extended air duct 711 are disposed on the first side plate 401, and the second air inlet 720 and the second extended air duct 721 are disposed on the second side plate 402. The window 41 is formed by connecting a plurality of window walls end to end, and two diagonally arranged notches are arranged on one of the window walls 411 corresponding to the outlet side of the arc chute plate assembly 5, and are respectively used as a first air inlet 710 and a second air inlet 720. In this way, the two exhaust passages are provided by using the window thickness space in the left-right direction in which the window 41 is opened in the substrate 4, and the installation space in the left-right direction is not additionally occupied, which is advantageous for the miniaturization of the circuit breaker. Moreover, the first air inlet 710 and the second air inlet 720, one right and one left, are exactly corresponding to the right half arc-extinguishing grid and the left half arc-extinguishing grid of the arc-extinguishing grid assembly 5, respectively, so as to further make the exhaust more uniform.

In this embodiment, the first extended air passage 711 and the second extended air passage 721 are two-stage zigzag passages, the first extended air passage 711 extends obliquely upward and then vertically upward, and the second extended air passage 721 extends obliquely downward and then vertically downward. Of course, in other embodiments, the first extended air duct 711 or the second extended air duct 721 may also be a three-segment, four-segment zigzag-shaped channel, or an arc-shaped channel, as long as the overall extending trend is inclined upwards or inclined downwards, in this embodiment, the first extended air duct 711 and the second extended air duct 721 are configured as two-segment zigzag-shaped channels to facilitate the manufacturing thereof, and the first extended air duct 711 and the second extended air duct 721 can also have a longer extending length.

In this embodiment, the first extension air passage 711 and the second extension air passage 721 are provided with two passages in parallel. In other embodiments, the first extended air passage 711 and/or the second extended air passage 721 may have only one passage, or three passages, four passages, etc. in parallel. The more the first extension air passage 711 and the second extension air passage 721 are provided, the more the air passage wall is provided, the more the cooling of the gas is facilitated, but the manufacturing is more difficult, and the two first extension air passages 711 and the two second extension air passages 721 can be selected in the embodiment to take the cooling effect of the gas and the manufacturing difficulty into consideration.

In this embodiment, a baffle (for example, a baffle 723, see fig. 5) inclined to the inner wall of the passage is provided on the inner wall of the first extended air duct 711 and the second extended air duct 721; the baffle is gradually far away from the inner wall of the channel from the upstream direction to the downstream direction of the first extended air passage 711 or the second extended air passage 721, and the baffle is arranged to prevent the gas from flowing back.

Referring to fig. 1 and 7, the downstream of the first extended air duct 711 is further communicated with a first air outlet channel 712, the first air outlet channel 712 extends leftward to discharge air from the left end surface of the first side cover 1, and the corresponding air outlet is a first air outlet 11 disposed on the left end surface of the first side cover 1. The downstream of the second extended air passage 721 is also communicated with a second air outlet channel 722, which extends leftward to discharge air from the left end surface of the first side cover 1, and the corresponding air outlet is a second air outlet 12 disposed on the left end surface of the first side cover 1. For the N-pole conductive system 20, a third exhaust channel 8 (see fig. 4) is provided, and the third exhaust channel 8 finally exhausts gas from the left end surface of the first side cover 1 to the left, and the corresponding exhaust gas is a third air outlet 13 provided on the left end surface of the first side cover 1. Therefore, in this embodiment, the L-pole conducting system 10 and the N-pole conducting system 20 are finally both left, that is, are discharged from the width direction of the circuit breaker, so that the exhaust passage is prevented from occupying the space in the length direction of the circuit breaker, and the miniaturization design of the circuit breaker in the length direction is facilitated.

In this embodiment, the outer corner of the joint of the first extension air duct 711 and the first air outlet channel 712 is an arc-shaped chamfer 9 (or may be an inclined chamfer), and the outer corner of the joint of the second extension air duct 721 and the second air outlet channel 722 is also of the same chamfer structure, so as to guide the bending direction of the gas through the chamfer structure, thereby improving the exhaust speed. Of course, the same chamfer structure may be adopted for the passage turn of the third exhaust passage 8.

Referring to fig. 2 and 7, in this embodiment, the channel cavity walls of the exhaust channel are partially formed on the substrate 4, the base 2 and the first side cover 1, and the exhaust channel is formed by joining the substrate 4 and the bases 2 and the first side covers 1 on the left and right sides of the substrate, so that the manufacturing difficulty is reduced, and the assembly of the product is facilitated.

The arc extinguish chamber and the arc extinguish chamber exhaust structure adopted in the embodiment can be applied to other switching appliances such as a disconnecting switch besides being applied to a circuit breaker.

While the invention has been particularly shown and described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (12)

1. Explosion chamber exhaust structure, including arc extinguishing bars piece subassembly and base plate, arc extinguishing bars piece subassembly comprises the relative interval arrangement of several arc extinguishing bars piece, defines the relative range orientation of arc extinguishing bars piece is upper and lower direction, its characterized in that: the base plate is provided with a window used for being installed in the arc extinguishing grid plate component, the edge of the window positioned at the outlet side of the arc extinguishing grid plate component is provided with an exhaust channel, the exhaust channel comprises a first exhaust channel and a second exhaust channel, the first exhaust channel further comprises a first air inlet and a first extending air channel, the second exhaust channel further comprises a second air inlet and a second extending air channel, wherein,

the first air inlet is correspondingly arranged at the outlet side of the lower arc-extinguishing grid plate of the arc-extinguishing grid plate assembly, the first extending air channel starts from the first air inlet and extends obliquely upwards,

the second air inlet is correspondingly arranged on the outlet side of the upper half arc-extinguishing grid plate of the arc-extinguishing grid plate assembly, and the second extending air channel starts from the second air inlet and extends obliquely downwards.

2. The arc chute exhaust structure according to claim 1, characterized in that: the base plate includes first side face and the second side face of difference, first air inlet and first extension air flue are located first side face, second air inlet and second extend the air flue and locate second side face.

3. The arc chute exhaust structure according to claim 2, characterized in that: the window is formed by connecting a plurality of window walls end to end, and two notches which are arranged diagonally are arranged on one of the window walls corresponding to the outlet sides of the arc extinguishing grid plate assembly and are respectively used as the first air inlet and the second air inlet.

4. The arc chute exhaust structure according to claim 2, characterized in that: the first side plate surface is relatively positioned on the right side of the substrate, the second side plate surface is relatively positioned on the left side of the substrate, the right half arc-extinguishing grid plate of the arc-extinguishing grid plate assembly corresponds to the first air inlet, and the left half arc-extinguishing grid plate of the arc-extinguishing grid plate assembly corresponds to the second air inlet.

5. The arc chute exhaust structure according to claim 1, characterized in that: the first extending air passage and/or the second extending air passage are/is a broken line-shaped passage or an arc-shaped passage.

6. The arc chute exhaust structure according to claim 5, characterized in that: the first extending air passage and the second extending air passage are two-section broken line-shaped passages, the first extending air passage extends obliquely upwards and then vertically upwards, and the second extending air passage extends obliquely downwards and then vertically downwards.

7. An arc chute exhaust structure according to claim 1, characterized in that: the first exhaust passage and/or the second exhaust passage are provided with at least two parallel passages.

8. An arc chute exhaust structure according to claim 1, characterized in that: a guide plate inclined to the inner wall of the channel is arranged on the inner wall of the channel of the first extending air channel and/or the second extending air channel; the baffle is gradually far away from the inner wall of the channel from the upstream direction to the downstream direction of the first extended air flue or the second extended air flue.

9. Switch electrical apparatus, including being used for moving contact and the stationary contact that control circuit switched on or break off, still including the explosion chamber that is used for carrying out the arc extinguishing to the electric arc that produces when moving contact and stationary contact break off, its characterized in that: the arc chute includes the arc chute exhaust structure of any of claims 1-8.

10. The switching device according to claim 9, characterized in that: the switching apparatus is bipolar circuit breaker, including the electrically conductive system of L utmost point, the electrically conductive system of N utmost point, base and first side cap joint relatively are in order to form the installation the inner space of the electrically conductive system of L utmost point and the electrically conductive system of N utmost point, the base plate is located in order to separate between base and the first side cap the electrically conductive system of L utmost point and the electrically conductive system of N utmost point, the electrically conductive system of L utmost point includes the explosion chamber, the electrically conductive system of N utmost point is equipped with third exhaust passage.

11. The switching device according to claim 10, characterized in that: defining the relative joint direction of the base and the first side cover as the left-right direction, wherein the first side cover is arranged on the left side of the base relatively, and the base is arranged on the right side of the first side cover relatively; the downstream of the first extending air passage is also communicated with a first air outlet passage, the first air outlet passage extends leftwards to discharge air from the left end face of the first side cover, the downstream of the second extending air passage is also communicated with a second air outlet passage, and the second air outlet passage extends leftwards to discharge air from the left end face of the first side cover.

12. The switching device according to claim 11, characterized in that: the third exhaust channel also exhausts from the left end face of the first side cover; and/or

The outer angle of the joint of the first extension air passage and the first air outlet passage is an arc chamfer or an inclined chamfer, and the outer angle of the joint of the second extension air passage and the second air outlet passage is an arc chamfer or an inclined chamfer; and/or

The exhaust passage is formed by joining the base plate and the base and the first side cover on both sides of the base plate.

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