Switch

Abstract

A switch belongs to the technical field of low-voltage apparatuses. Comprising an arc extinguish chamber, a contact system and a shell, the contact system is located in the shell, the arc extinguish chamber is located on one side of the contact system, the arc extinguish chamber comprises a pair of side plates and grid pieces arranged between the side plates, the arc extinguish chamber further comprises a pair of gas generating parts, the gas generating parts are located on one sides of gas inlets of the grid pieces in an array mode, and the gas generating parts are located on the other sides of gas inlets of the grid pieces in an array mode. The gas generator further comprises a sealing matching structure, and the sealing matching structure is arranged on the gas generation piece in the array direction of the grid pieces and used for blocking or reducing gaps between the side plates and the inner wall, opposite to the side plates, of the shell. The arc extinguish chamber has the advantages that the sealing matching structure used for blocking or reducing the gap between the side plate of the arc extinguish chamber and the inner wall surface of the shell is additionally arranged on the gas generation piece of the arc extinguish chamber, so that arc gas is prevented from overflowing from the gap, the occurrence probability of breakdown is effectively reduced, and the performance of the switch is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of low-voltage electrical apparatus, and particularly relates to a switch. BACKGROUND

[0002] As an important power distribution equipment, the air circuit breaker is connected to the power supply network and used for protecting the loads under it from damage by fault current. However, with the development of new energy, the circuit breaker is used in more and more occasions, and the voltage requirement is also increasing. New requirements are put forward for the existing air circuit breaker.

[0003] The arc extinguishing chamber is used for extinguishing arc to cut off current. The contact arc chamber is formed in the inside of the shell of the circuit breaker, and the contact system is arranged in the contact arc chamber, and the arc extinguishing chamber is arranged at the opening side of the contact arc chamber. Specifically, the arc extinguishing chamber is located at the air outlet side of the contact system, and the arc generated on the contact system enters the arc extinguishing chamber and is extinguished in the arc extinguishing chamber. The arc extinguishing chamber comprises a pair of side plates, and the side plates are arranged in a spaced manner, and the side plates have an array of fins therebetween. In the prior art, a gap is formed between the side plates of the arc extinguishing chamber and the inside of the shell, and the arc gas will leak from the gap, thereby causing the breakdown of the circuit breaker. SUMMARY

[0004] The utility model discloses a switch, which is provided with a sealing matching structure for plugging or reducing the gap between the side plates of the arc extinguishing chamber and the inner wall of the shell, so that the overflow of arc gas from the gap is prevented, and the occurrence of breakdown is prevented.

[0005] The utility model discloses a switch, which is provided with a sealing matching structure for plugging or reducing the gap between the side plates of the arc extinguishing chamber and the inner wall of the shell, so that the overflow of arc gas from the gap is prevented, and the occurrence of breakdown is prevented.

[0006] In one specific embodiment of the utility model, the gas generating member comprises a wrapping surface, and the wrapping surface covers the inner side of the fin leg of the fin.

[0007] In another specific embodiment of the utility model, the gas generating member further comprises an abutting surface, the abutting surface abuts against the side plate, the sealing matching structure is located at the lower edge of the gas generating member, and the sealing matching structure extends to the inner wall of the shell beyond the lower edge of the side plate.

[0008] In still another specific embodiment of the utility model, the gap d is formed between the sealing cooperation structure and the inner wall of the shell, and 0.5mm≤d≤3 mm.

[0009] In still another specific embodiment of the utility model, the sealing cooperation structure is matched with the lower edge of the side plate in shape, and the two are arranged in close contact.

[0010] In still another specific embodiment of the utility model, in the array direction of the grid sheet, the sealing cooperation structure extends from one end of the arc extinguishing chamber corresponding to the static contact of the contact system to the other end of the arc extinguishing chamber corresponding to the dynamic contact of the contact system and constitutes an extension end.

[0011] In still another specific embodiment of the utility model, the shell comprises a base and a bottom plate, the base and the bottom plate are spliced to form the shell, and in the array direction of the grid sheet, the extension end of the sealing cooperation structure is matched with the base.

[0012] In still another specific embodiment of the utility model, in the array direction of the grid sheet, the sealing cooperation structure extends to the end of the arc extinguishing chamber corresponding to the dynamic contact.

[0013] In still another specific embodiment of the utility model, the sealing cooperation structure is made of elastic material.

[0014] In still another specific embodiment of the utility model, the arc extinguishing chamber further comprises an ionization elimination assembly and an arc extinguishing cover, the ionization elimination assembly is located above the grid sheet, and the arc extinguishing cover is located above the ionization elimination assembly.

[0015] The utility model has the beneficial effects that: the sealing cooperation structure is additionally arranged on the gas generating part of the arc extinguishing chamber to block or reduce the gap between the side plate of the arc extinguishing chamber and the inner wall of the shell, thereby preventing the arc gas from overflowing from the gap, effectively reducing the probability of breakdown, and improving the performance of the switch. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is the explosion schematic view of the switch of the utility model;

[0017] Figure 2 It is the three-dimensional structure schematic view of the arc extinguishing chamber of the utility model;

[0018] Figure 3 It is the explosion view of the arc extinguishing chamber of the utility model;

[0019] Figure 4 It is the three-dimensional structure schematic view of the aperture plate of the utility model;

[0020] Figure 5 The top view of the hole plate of the utility model;

[0021] Figure 6 The three-dimensional structure schematic view of the flameout piece support of the utility model;

[0022] Figure 7 The three-dimensional structure schematic view of one side of the gas production piece of the utility model;

[0023] Figure 8 The three-dimensional structure schematic view of the other side of the gas production piece of the utility model;

[0024] Figure 9 The plane structure schematic view of the gas production piece and the base cooperation of the utility model.

[0025] In the drawing: 1. arc-extinguishing chamber, 11. side plate, 12. grid piece, 13. gas production piece, 131. wrapping surface, 1311. lower lamination part, 1312. protruding block, 1313. convex edge, 132. mounting rib, 1321. mounting groove, 1322. mounting cavity, 133. abutting surface, 134. covering part, 14. ionization elimination assembly, 141. support, 142. hole plate, 1421. air hole, 14211. middle air hole, 14212. lateral air hole, 1422. positioning boss, 143. flameout piece support, 1431. crossbeam, 1432. flameout piece, 14321. first through cavity, 14322. second through cavity, 144. filtering assembly, 145. sealing gasket, 15. arc-extinguishing cover, 16. pin shaft assembly, 161. pin shaft, 162. mounting clamp; 2. contact system, 21. movable contact, 22. static contact; 3. shell, 31. base, 32. bottom plate; 100. sealing cooperation structure; 200. first mounting end; 300. second mounting end. DETAILED DESCRIPTION

[0026] The specific embodiments of the utility model will be described in detail below in combination with the drawings, but the description of the embodiments is not the limitation of the technical scheme, and any formal but not substantial changes according to the concept of the utility model should be regarded as the protection scope of the utility model.

[0027] In the following description, the concepts of directionality (or directionality) of up, down, left, right, front and back are all in the position state of the corresponding drawing, and the purpose is to facilitate the public to understand, so it cannot be understood as the special limitation of the technical scheme provided by the utility model.

[0028] For example, Figure 1The switch comprises an isolating switch and a circuit breaker. The switch comprises an arc extinguishing chamber 1, a contact system 2 and a housing 3. The housing 3 comprises a base 31 and a bottom plate 32, which are spliced to form the housing 3. Usually, the base 31 and the bottom plate 32 are fixed by screwing. The contact system 2 is located inside the housing 3, and the arc extinguishing chamber 1 cooperates with the inner wall of the housing 3 and is located on one side of the contact system 2.

[0029] The contact system 2 comprises a moving contact 21 and a stationary contact 22. The moving contact 21 is installed on the base 31, and the stationary contact 22 is installed on the bottom plate 32. Specifically, the moving contact 21 is rotatably arranged, and the stationary contact 22 is fixedly arranged. The moving contact 21 acts to contact or separate from the stationary contact 22. Of course, for a molded case circuit breaker, the moving contact 21 and the stationary contact 22 can be arranged on the bottom plate 32 at the same time.

[0030] As Figure 2 , Figure 3 is a schematic view of the arc extinguishing chamber 1. The arc extinguishing chamber 1 comprises a pair of side plates 11 and a plurality of fins 12 arranged between the pair of side plates 11. A gas generating element 13 is arranged on the air inlet side of the array of fins 12. The gas generating element 13 is a pair of elements, each wrapping one of the two fin legs of the fin 12. The arc extinguishing chamber 1 further comprises a deionization assembly 14 and an arc extinguishing cover 15. The deionization assembly 14 is located above the fin 12, and the arc extinguishing cover 15 is located above the deionization assembly 14. That is, the deionization assembly 14 is located on the air outlet side of the fin 12, and the arc extinguishing cover 15 is located above the deionization assembly 14. The gas generating element 13 is fixed to the fin leg of the fin 12 by a pin shaft assembly 16, and the gas generating element 13 is riveted to the corresponding side plate 11.

[0031] The deionization assembly 14 comprises a bracket 141 which is hollow inside to form a containing cavity. The containing cavity is internally provided with a hole plate 142, a flameout sheet bracket 143 and a filter assembly 144. The bracket 141 is provided with a sealing gasket 145 on the top. The hole plate 142 is located at the lowermost position, i.e. the hole plate 142 is provided on the air outlet side of the array of grid sheets 12. The flameout sheet bracket 143 is located above the hole plate 142, and the filter assembly 144 is located above the flameout sheet bracket 143. Specifically, the hole plate 142, the flameout sheet bracket 143 and the filter assembly 144 are all located inside the bracket 141 and are arranged in layers one above another. The sealing gasket 145 covers the opening of the bracket 141, and the arc extinguishing cover 15 covers the sealing gasket 145, i.e. the arc extinguishing cover 15 and the bracket 141 clamp the sealing gasket 145. The sealing gasket 145 can seal the installation gap around the bracket 141 and the arc extinguishing cover 15, thereby improving the air tightness of the assembly between the arc extinguishing cover 15 and the bracket 141.

[0032] The bracket 141 is fixed with a pair of side plates 11, for example, by clamping. The bracket 141 is fixed with the arc extinguishing cover 15 by screws, thereby integrally installing the hole plate 142, the flameout sheet bracket 143, the filter assembly 144 and the sealing gasket 145.

[0033] As shown in Figure 4 , Figure 5 is a schematic view of the hole plate 142. The hole plate 142 is provided with an array of a plurality of air holes 1421. The hole plate 142 is provided with a positioning boss 1422 outwardly protruding from the side of the hole plate 142 facing the array of grid sheets 12. Specifically, the positioning boss 1422 is located at the periphery of the distribution area of the air holes 1421, and preferably, the positioning boss 1422 is located at the four corners of the hole plate 142. The positioning boss 1422 is embedded into the top of the array of grid sheets 12 to improve the positioning effect between the hole plate 142 and the array of grid sheets 12, so as to ensure that the gaps between adjacent grid sheets 12 correspond to the air holes 1421 on the hole plate 142.

[0034] The air holes 1421 comprise central air holes 14211 and lateral air holes 14212. In the width direction of the grid sheet 12, the lateral air holes 14212 are located on both sides, and the central air holes 14211 are located between the two rows of lateral air holes 14212. The diameter of the central air holes 14211 is larger than that of the lateral air holes 14212.

[0035] More specifically, the central air holes 14211 at both ends of the array of grid sheets 12 have a larger diameter than the central air holes 14211 located in the middle.

[0036] As shown in Figure 6Fig. 9 is a schematic view of the flame-arresting fin support 143. The flame-arresting fin support 143 includes a pair of cross beams 1431 on both sides. Specifically, in the width direction of the grid fin 12, a pair of cross beams 1431 are arranged on both sides and are spaced apart. A plurality of flame-arresting fins 1432 are arranged between the pair of cross beams 1431, and the flame-arresting fins 1432 are preferably arranged obliquely.

[0037] The lower side of the flame-arresting fin 1432 close to the hole plate 142 is provided with a first through cavity 14321, which can also be in the form of a hole. This arrangement allows the arc gas to pass through each other after passing through the hole plate 142, thereby balancing the airflow field and preventing the occurrence of front breakdown.

[0038] Preferably, a second through cavity 14322 is provided on the upper side of the flame-arresting fin 1432, i.e. the side facing the filter assembly 144. The second through cavity 14322 can also be in the form of a hole. This arrangement allows the arc gas to pass through each other after passing through the flame-arresting fin 1432, thereby corresponding to the air inlet on the filter assembly 144.

[0039] See Figure 3 The filter assembly 144 includes a frame support and a plurality of metal filter screens arranged in the frame support. The metal filter screens are folded and arranged in separate holding cavities in the frame support.

[0040] As Figure 7 、 Figure 8 Fig. 10 is a schematic view of the gas-producing member 13. The gas-producing member 13 is usually made of a gas-producing material. When an arc is generated, the gas-producing member 13 is heated and releases insulation gas, which can accelerate the extinguishing of the arc.

[0041] The gas production member 13 comprises a wrapping surface 131, a mounting rib 132 and an abutting surface 133. The wrapping surface 131 covers the inner side of the grid leg of the grid 12, while the abutting surface 133 abuts against the side plate 11, and the mounting rib 132 extends upward from the side of the wrapping surface 131 close to the grid leg. A sealing structure 100 wrapping the lower edge of the side plate 11 is further arranged at the lower edge of the gas production member 13, and extends below the lower edge of the side plate 11 and towards the inner wall of the shell 3. The two can reduce the gap between the side plate 11 and the corresponding inner wall of the shell 3, and reduce the leakage of arc gas from the gap. Preferably, the sealing structure 100 is shaped to match the lower edge of the side plate 11, and the two are arranged in close contact. The sealing structure 100 can also be mounted on the inner wall of the shell 3 corresponding to the side plate 11, specifically on the base 31 and / or the bottom plate 32, and the sealing structure 100 cooperates with the side plate 11 to reduce the gap. Specifically, the gap d between the sealing structure 100 and the corresponding inner wall of the side plate 11 is 0.5mm≤d≤3mm. In addition, the sealing structure 100 can be arranged on the side plate 11 to reduce the gap between the side plate 11 and the corresponding inner wall of the shell 3, specifically the gap between the side plate 11 and the base 31 and / or the bottom plate 32. The sealing structure 100 can also be in the form of an insert to block the gap. At this time, the sealing structure 100 is arranged on the arc extinguishing chamber 1 and the inner wall of the shell 3 at the same time.

[0042] If the gap is reduced, it is considered that the gap is reduced; if the gap is completely blocked, it is considered that the gap is blocked.

[0043] Please continue to refer to Figure 7 , Figure 8 and in combination with Figure 3 , a mounting groove 1321 is arranged on the mounting rib 132, and the mounting groove 1321 is preferably an open groove with the opening facing upward. A pin shaft assembly 16 is further included, which comprises a pin shaft 161 and a mounting clamp 162. When the gas production member 13 is installed in place, the pin shaft 161 is pinned to the grid leg of the grid 12, and after the mounting clamp 162 is connected to the pin shaft 161, it is inserted into the mounting cavity 1322 of the mounting rib 132 at the end. The mounting groove 1321 allows the pin shaft 161 to pass through.

[0044] The abutting surface 133 is further provided with a first mounting end 200 and a second mounting end 300, wherein the first mounting end 200 is located at the lower side and the second mounting end 300 is located at the upper side. The first mounting end 200 is located below the mounting rib 132 and the second mounting end 300 is located at the side of the mounting rib 132 close to the side plate 11. The first mounting end 200 and the second mounting end 300 are used to connect with the side plate 11.

[0045] The gas generating member 13 is provided with a downwardly extending cover portion 134 at the end corresponding to the stationary contact 22, which is located at both sides of the arc contact on the stationary contact 22.

[0046] The wrapping surface 131 is further provided with a lower adhering portion 1311 adhering to the side plate 11. The wrapping surface 131 is provided with a protrusion 1312 at the side away from the grid leg, i.e. the side of the wrapping surface 131 facing the middle part of the arc extinguishing chamber 1. The protrusion 1312 is located at both sides of the arc contact on the stationary contact 22 or at both sides of the stationary arc striking plate on the stationary contact 22, or at both sides of the arc contact and the stationary arc striking plate on the stationary contact 22. The protrusion 1312 is further provided with a convex edge 1313 at the side close to the stationary contact 22. The convex edge 1313 extends downwardly and protrudes through the protrusion 1312, and the part of the convex edge 1313 extending downwardly and protruding through the protrusion 1312 constitutes the cover portion 134. The width between the convex edges 1313 of a pair of gas generating members 13 is greater than the width between the protrusions 1312.

[0047] Preferably, the protrusion 1312 and the convex edge 1313 are connected to the wrapping surface 131 and the lower adhering portion 1311. Of course, the above connection relationship is not necessarily, and the protrusion 1312 and the convex edge 1313 can be connected to only the wrapping surface 131 or the lower adhering portion 1311, i.e. connected to the gas generating member 13.

[0048] As shown in FIG. 1, the arc extinguishing chamber 1 is provided with a plurality of gas generating members 13, and the gas generating members 13 are arranged in a plurality of rows. The gas generating members 13 are arranged in a plurality of rows in the arc extinguishing chamber 1, and the gas generating members 13 in each row are arranged in a staggered manner. Figure 9 FIG. 6 is a schematic view of the sealing and fitting structure 100 of the gas generating member 13 and the base 31. In the figure, only the sealing and fitting structure 100 and the base 31 are shown, and in the actual product, the sealing and fitting structure 100 and the inner wall of the base 31 and / or the inner wall of the bottom plate 32 are fitted, and the inner wall of the sealing and fitting structure 100 and the base 31 forms a gap d. Since the sealing and fitting structure 100 protrudes through the side plate 11, the gap d is smaller than the gap between the side plate 11 and the inner wall of the base 31, thereby improving the sealing property and preventing the arc gas from leaking from the gap.

[0049] In the above-mentioned embodiments, the sealing structure 100 is arranged on the gas generating element 13, of course, the sealing structure 100 can also be arranged on other components of the arc extinguishing chamber 1, or the sealing structure 100 is arranged on the inner wall of the housing 3 opposite to the side plate 11, or the sealing structure 100 is arranged on the inner wall of both the arc extinguishing chamber 1 and the housing 3. Of course, the sealing structure 100 arranged on the gas generating element 13 is also considered to be arranged on the arc extinguishing chamber 1.

[0050] In the array direction of the grid plates 12, the sealing structure 100 extends from one end of the arc extinguishing chamber 1 corresponding to the static contact 22 of the contact system 2 to the other end of the arc extinguishing chamber 1 corresponding to the dynamic contact 21 of the contact system 2 and forms an extension end. That is, the sealing structure 100 should be located at least in the part of the arc extinguishing chamber 1 corresponding to the static contact 22. At this time, the sealing structure 100 is convenient to be integrally formed with the gas generating element 13.

[0051] Preferably, in the array direction of the grid plates 12, the extension end of the sealing structure 100 cooperates with the base 31. Specifically, there is a protruding component extending to the bottom plate 32 on the base 31, and the extension end of the sealing structure 100 cooperates with the protruding component.

[0052] Another preferred, in the array direction of the grid plates 12, the sealing structure 100 extends to the end of the arc extinguishing chamber 1 corresponding to the dynamic contact 21. At this time, in the array direction of the grid plates 12, the sealing structure 100 is consistent with the length of the side plate 11.

[0053] The above-mentioned gap d is an embodiment of the present application, of course, the sealing structure 100 and the component cooperating therewith can be in contact to form a seal. However, considering the need for installation, the cooperation of the two to form a gap d is preferred, preferably, the gap d is 0.5 mm to 3 mm. More preferably, the gap d is 0.5 mm to 1 mm. In this embodiment, the contact between the sealing structure 100 and the inner wall of the base 31 or the cooperation between the two with a gap d is collectively referred to as a close fit. Of course, when the sealing structure 100 and the component cooperating therewith are in contact, the sealing structure 100 should be made of elastic material, such as rubber.

[0054] In summary, the technical scheme provided by the present application makes up for the shortcomings in the prior art and successfully completes the utility model task, and truly realizes the technical effects described by the applicant in the above technical effect column.

Claims

1. A switch comprising an arc extinguishing chamber (1), a contact system (2) and a housing (3), the contact system (2) being located inside the housing (3), the arc extinguishing chamber (1) being located on one side of the contact system (2), the arc extinguishing chamber (1) comprising a pair of side plates (11) and a plurality of fins (12) arranged between the pair of side plates (11), the arc extinguishing chamber (1) further comprising a pair of gas generating members (13) located on the gas inlet side of the array of fins (12), characterized in that: The sealing structure (100) is arranged on the gas production member (13) along the array direction of the grid plates (12) and is used to block or reduce the gap between the side plate (11) and the inner wall of the shell (3) opposite to the side plate (11).

2. A switch according to claim 1, characterised in that: The gas production member (13) comprises a wrapping surface (131) covering the inner side of the grid plate leg of the grid plate (12).

3. A switch according to claim 2, wherein: The gas production member (13) further comprises an abutting surface (133) abutting against the side plate (11), the sealing structure (100) is located at the lower edge of the gas production member (13), the sealing structure (100) extends beyond the lower edge of the side plate (11) and extends to the inner wall of the shell (3).

4. A switch according to claim 1, wherein: The gap d between the sealing structure (100) and the inner wall of the shell (3) is 0.5mm≤d≤3mm.

5. A switch according to claim 3, wherein: The sealing structure (100) is matched with the lower edge of the side plate (11) in shape and is arranged in close contact.

6. A switch according to claim 1, wherein: In the array direction of the grid plates (12), the sealing structure (100) extends from one end of the arc extinguishing chamber (1) corresponding to the static contact (22) of the contact system (2) to the other end of the arc extinguishing chamber (1) corresponding to the moving contact (21) of the contact system (2) and forms an extended end.

7. A switch according to claim 6, characterised in that: The shell (3) comprises a base (31) and a bottom plate (32), the base (31) and the bottom plate (32) are spliced to form the shell (3), and the extended end of the sealing structure (100) is matched with the base (31) in the array direction of the grid plates (12).

8. A switch according to claim 6, wherein: In the array direction of the grid plates (12), the sealing structure (100) extends to the end of the arc extinguishing chamber (1) corresponding to the moving contact (21).

9. A switch according to claim 1, wherein: The sealing structure (100) is made of elastic material.

10. A switch according to claim 1, wherein: The arc extinguishing chamber (1) further comprises a deionization assembly (14) and an arc extinguishing cover (15), the deionization assembly (14) is located above the grid plates (12), and the arc extinguishing cover (15) is located above the deionization assembly (14).

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