Sealing structure of circuit breaker

Abstract

A sealing structure of a circuit breaker belongs to the technical field of circuit breakers. According to the sealing structure of the circuit breaker, the circuit breaker comprises a shell, a contact system and an arc extinguish chamber, the arc extinguish chamber is located on one side of the opening direction of the contact system, the contact system comprises a moving contact and a static contact, the shell comprises a base and a bottom plate, the moving contact is installed on the base, the static contact is installed on the bottom plate, and the static contact comprises a conducting bar. The conducting bars extend outwards from the corresponding gaps on the shell; the sealing structure is characterized in that the sealing structure comprises a first sealing assembly, the first sealing assembly comprises a first sealing strip, and the first sealing strip is arranged on the side, close to the arc extinguish chamber, of the conducting bar and seals a gap in the side, close to the arc extinguish chamber, of the conducting bar. The utility model has the advantages that the combined sealing ring is arranged around the conducting bar, the sealing ring is convenient to install, and the air tightness of the unit pole is greatly improved, so that the performance of the circuit breaker is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of circuit breakers, and in particular relates to a sealing structure of a circuit breaker. Background Art

[0002] Air circuit breakers are important power distribution equipment that are connected to the power supply network to protect the loads below from damage caused by fault currents. However, with the development of new energy sources, DC circuit breakers are used in more and more occasions and the voltage requirements are also increasing, which puts forward new requirements for existing air circuit breakers.

[0003] A circuit breaker usually includes at least two unit poles, each of which is provided with a set of contact systems. Above the contact system is an arc extinguishing chamber. The arc generated by the contact system enters the arc extinguishing chamber and is extinguished in the arc extinguishing chamber. The airtightness in the unit pole is crucial for the extinguishing of the arc. How to improve the airtightness in the unit pole has always been a problem pursued and focused on by ordinary technicians in this field. Utility Model Content

[0004] The task of the utility model is to provide a sealing structure of a circuit breaker, which arranges a combined sealing ring around the conductive bar. The sealing ring is easy to install and greatly improves the air tightness of the unit pole, thereby improving the performance of the circuit breaker.

[0005] In order to accomplish the above tasks, the technical solution provided by the utility model is: a sealing structure of a circuit breaker, the circuit breaker comprises a shell, a contact system and an arc extinguishing chamber, the arc extinguishing chamber is located on one side of the opening direction of the contact system, the contact system comprises a moving contact and a static contact, the shell comprises a base and a bottom plate, the moving contact is mounted on the base, and the static contact is mounted on the bottom plate, the static contact comprises a conductive bar, and the conductive bar protrudes outward from a corresponding notch on the shell; the characteristic is that: the sealing structure comprises a first sealing component, the first sealing component comprises a first sealing strip, the first sealing strip is arranged on one side of the conductive bar close to the arc extinguishing chamber, and seals the gap of the conductive bar close to the side of the arc extinguishing chamber.

[0006] In a specific embodiment of the present invention, the conductive row is connected to the upper side of the circuit breaker, and the movable contact row is connected to the lower side of the circuit breaker.

[0007] In another specific embodiment of the present invention, the first sealing assembly further includes a second sealing strip, and the first sealing strip and the second sealing strip surround the conductive bar to form a sealing ring.

[0008] In another specific embodiment of the present invention, the first sealing strip is embedded in the first receiving groove of the base, and the second sealing strip is embedded in the second receiving groove of the bottom plate.

[0009] In another specific embodiment of the present invention, an end baffle is provided on the base, and the first receiving groove is located on the end baffle.

[0010] In another specific embodiment of the present utility model, a card slot is provided on the bottom plate, the card slot is snap-fitted with the end baffle, and the second receiving slot is located on the card slot.

[0011] In a further specific embodiment of the present invention, a positioning hole is provided on the first accommodating groove, and the aperture size of the positioning hole is larger than the groove width size of the first accommodating groove; the first sealing strip includes a sealing strip body, and a positioning portion is provided on the sealing strip body, and the positioning portion is embedded and matched with the positioning hole to realize the positioning installation between the first sealing strip and the first accommodating groove of the end baffle.

[0012] In a further specific embodiment of the present invention, the positioning portion is circular, and correspondingly, the positioning hole is also circular.

[0013] In yet another specific embodiment of the present invention, the second sealing strip includes a connecting portion and a pair of side portions, and the connecting portion connects one end of the pair of side portions to form a "[" shape.

[0014] In yet another specific embodiment of the present invention, an enlarged portion is provided on the connecting portion, and an outer dimension of the enlarged portion is larger than a groove width dimension of the second accommodating groove.

[0015] The utility model has the following beneficial effects due to the adoption of the above structure: firstly, a split sealing ring formed by the first sealing strip and the second sealing strip is adopted to seal the gap around the conductive bar, the combined sealing ring is easy to install, and the air tightness of the unit pole is greatly improved, thereby improving the performance of the circuit breaker; secondly, a split sealing ring formed by the first sealing strip and the second sealing strip is adopted to seal the gap around the conductive bar, the combined sealing ring is easy to install, and the air tightness of the unit pole is greatly improved, thereby improving the performance of the circuit breaker; BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the circuit breaker of the utility model;

[0017] Figure 2 It is an explosion diagram of one side of the circuit breaker of the utility model;

[0018] Figure 3 It is an explosion diagram of the other side of the circuit breaker of the utility model;

[0019] Figure 4 It is a schematic diagram of the static contact of the circuit breaker of the utility model;

[0020] Figure 5 It is a partial structural schematic diagram of the base of the utility model;

[0021] Figure 6 This is a schematic diagram of the structure of the first sealing strip of the utility model;

[0022] Figure 7 It is a partial structural schematic diagram of the bottom plate of the utility model;

[0023] Figure 8 It is a schematic structural diagram of the second sealing strip of the utility model.

[0024] In the figure: 1. shell, 11. base, 111. end baffle, 1111. first accommodating groove, 1112. positioning hole, 12. bottom plate, 121. slot, 1211. second accommodating groove, 122. partition wall; 2. contact system, 21. moving contact, 22. static contact, 221. conductive bar, 222. static contact, 223. arc-starting plate, 224. arc-isolating member; 3. arc-extinguishing chamber; 4. sealing assembly, 41. first sealing strip, 411. sealing strip body, 4111. positioning part, 4112. enlarged part, 42. second sealing strip, 421. connecting part, 422. side part, 423. enlarged part; 5. third sealing strip. DETAILED DESCRIPTION

[0025] The specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings, but the description of the embodiments is not a limitation of the technical solution. Any changes in form rather than substance based on the concept of the present invention should be regarded as the protection scope of the present invention.

[0026] In the following description, all concepts related to directionality or orientation such as up, down, left, right, front and back are based on the positions shown in the corresponding drawings, and therefore cannot be understood as a special limitation on the technical solution provided by the utility model.

[0027] like Figure 1 , Figure 2 , Figure 3, which is a schematic diagram of a circuit breaker. The circuit breaker includes a housing 1, a contact system 2 and an arc extinguishing chamber 3. At least two unit poles are formed in the housing 1, and each unit pole is provided with a contact system 2 and an arc extinguishing chamber 3. The arc extinguishing chamber 3 is located above the contact system 2, that is, the arc extinguishing chamber 3 is located at the vent of the unit pole. Therefore, when an arc is generated in the contact system 2, the arc enters the arc extinguishing chamber 3 and is extinguished inside the arc extinguishing chamber 3, and the generated gas is discharged from the vent of the unit pole.

[0028] The housing 1 includes a base 11 and a bottom plate 12. The base 11 and the bottom plate 12 can be spliced ​​together to form a complete housing 1. The contact system 2 and the arc extinguishing chamber 3 are both located in the inner cavity formed by splicing the base 11 and the bottom plate 12.

[0029] The contact system 2 includes a moving contact 21 and a stationary contact 22. The moving contact 21 can swing, while the stationary contact 22 is fixed. After the moving contact 21 swings, it contacts or separates with the stationary contact 22. When the two are in contact, the circuit breaker is in a closed state, and when the two are separated, the circuit breaker is in an open state.

[0030] Specifically, the moving contact 21 is mounted on the base 11, and the stationary contact 22 is mounted on the bottom plate 12. When the base 11 and the bottom plate 12 are spliced, the moving contact 21 and the stationary contact 22 are installed in place.

[0031] like Figure 4 , is a schematic diagram of the stationary contact 22. The stationary contact 22 comprises a conductive bar 221, a stationary contact 222, an arc-striking piece 223 and an arc-isolating piece 224. The conductive bar 221 is made of conductive copper material, the stationary contact 222 is fixed on the conductive bar 221, and the arc-striking piece 223 is also fixed on the conductive bar 221 and extends toward the arc-extinguishing chamber 3. The arc-striking piece 223 is located above the stationary contact 222. That is, when the moving contact 21 is separated from the stationary contact 222, an arc is generated on the stationary contact 222, and the arc is pulled upward by the arc-striking piece 223 and quickly enters the arc-extinguishing chamber 3. The arc-isolating piece 224 is installed on the conductive bar 221 and surrounds the arc-striking piece 223 on three sides.

[0032] The conductive row 221 extends outwards toward the top of the circuit breaker, and the movable outgoing row of the movable contact 21 extends outwards toward the bottom of the circuit breaker.

[0033] A sealing structure is provided on the conductive bar 221, and the sealing structure includes a first sealing component 4, and the first sealing component 4 surrounds the conductive bar 221. The first sealing component 4 is simultaneously inserted into the corresponding peripheral grooves of the base 11 and the bottom plate 12, so that the first sealing component 4 can prevent the arc from flowing to the outside of the unit pole from the gaps around the conductive bar 221.

[0034] The first sealing assembly 4 includes a first sealing strip 41 and a second sealing strip 42. The first sealing strip 41 and the second sealing strip 42 together form a sealing ring. The sealing ring is preferably rectangular and matches the cross-sectional shape of the conductive bar 221.

[0035] For this solution, the first sealing strip 41 and the second sealing strip 42 are combined to form a sealing ring to improve the sealing method, and only the first sealing strip 41 can also achieve the sealing effect. The reason is that, structurally, due to the obstruction of the live bar 221, the gap located on the side close to the arc extinguishing chamber 3 has a greater impact on air tightness. The first sealing strip 41 is arranged on the side of the conductive bar 221 close to the arc extinguishing chamber 3 to seal the gap on the side of the conductive bar 221 close to the arc extinguishing chamber 3. Therefore, only the first sealing strip 41 can achieve the effect of improving air tightness. The combination of the first sealing strip 41 and the second sealing strip 42 is used as the preferred method.

[0036] like Figure 5 , Figure 6 The base 11 is provided with an end baffle 111, and a first receiving groove 1111 is provided on the end baffle 111. The first receiving groove 1111 corresponds to the first sealing strip 41, that is, the first sealing strip 41 can be inserted into the first receiving groove 1111. Preferably, a positioning hole 1112 is provided on the first receiving groove 1111, and the aperture size of the positioning hole 1112 is larger than the groove width size of the first receiving groove 1111.

[0037] The first sealing strip 41 is in the shape of a straight strip, including a sealing strip body 411, on which a positioning portion 4111 and an enlarged portion 4112 are provided. Preferably, the positioning portion 4111 is circular, and correspondingly, the positioning hole 1112 is also circular, and the two are embedded and matched. When the two are embedded and matched, the positioning relationship between the first sealing strip 41 and the first receiving groove 1111 of the end baffle 111 can be effectively achieved. The enlarged portion 4112 is also preferably circular, and its outer diameter is larger than the width of the sealing strip body 411, and larger than the groove width of the first receiving groove 1111. When the first sealing strip 41 is embedded in the first receiving groove 1111, the enlarged portion 4112 will be deformed due to extrusion, so as to be fully filled into the first receiving groove 1111, thereby achieving a better sealing effect.

[0038] like Figure 7 , Figure 8 The bottom plate 12 is provided with a slot 121, and the slot 121 is snapped into the end baffle 111. When the base 11 and the bottom plate 12 are spliced, the end baffle 111 is snapped into the slot 121. After being snapped into place, a gap is left between the end baffle 111 and the slot 121 for the conductive bar 221 to pass through.

[0039] A second receiving groove 1211 is provided on the card slot 121 . The second receiving groove 1211 is used for embedding the second sealing strip 42 . Preferably, the shape of the second receiving groove 1211 matches the shape of the second sealing strip 42 .

[0040] The above-mentioned first receiving groove 1111 is used for the installation and positioning of the first sealing strip 41, and the second receiving groove 1211 is used for the installation and positioning of the second sealing strip 42, which should be understood as specific and preferred implementations. If there is no first receiving groove 1111 and the second receiving groove 1211, or other methods are used for installation and positioning, it should also fall within the scope of protection created by the present invention. For example, when installing the first sealing strip 41 and the second sealing strip 42, they can be installed in place by squeezing them into the corresponding gaps. Or by using fixings, the first sealing strip 41 and the second sealing strip 42 can be nailed to the corresponding positions to achieve their installation and positioning.

[0041] The second sealing strip 42 is in a “[” shape, surrounding three sides of the conductive bar 221, while the first sealing strip 41 is located outside one side of the conductive bar 221. When the first sealing strip 41 and the second sealing strip 42 are combined, they surround the conductive bar 221.

[0042] The second sealing strip 42 includes a connecting portion 421 and a pair of side portions 422 , wherein the connecting portion 421 connects one end of the pair of side portions 422 to form a “[” shape.

[0043] Preferably, an enlarged portion 423 is provided on the connecting portion 421. The enlarged portion 423 is also preferably circular, and its outer diameter is larger than the width of the second sealing strip 42, and larger than the groove width of the second receiving groove 1211. When the second sealing strip 42 is embedded in the second receiving groove 1211, the enlarged portion 423 will be deformed due to extrusion, so as to fully fill the second receiving groove 1211, thereby achieving a better sealing effect.

[0044] The utility model adopts a split first sealing component 4, which is used to seal the gaps around the conductive bar 221 to improve the air tightness of the unit pole and improve the arc extinguishing performance of the circuit breaker. The split first sealing component 4 includes a first sealing strip 41 and a second sealing strip 42. Among them, the first sealing strip 41 is first installed in the first receiving groove 1111, and the second sealing strip 42 is first installed in the second receiving groove 1211. When the moving contact 11 and the static contact 12 are installed in place, the base 11 and the bottom plate 12 are spliced, and during the splicing process, the installation of the first sealing component 4 is completed at the same time.

[0045] See you next time Figure 3 , Figure 7 The sealing structure further includes a third sealing strip 5. A partition wall 122 is provided on the bottom plate 12 to separate adjacent unit poles. Correspondingly, a partition wall is also provided on the base 11 to separate adjacent unit poles. The third sealing strip 5 is installed between the partition wall 122 and the partition wall. That is, when the partition wall 122 and the partition wall are spliced ​​correspondingly, the third sealing strip 5 can seal the gap between the two, thereby further improving the airtightness between the two.

Claims

1. A sealing structure for a circuit breaker, the circuit breaker comprising a housing (1), a contact system (2) and an arc extinguishing chamber (3), the arc extinguishing chamber (3) being located on one side of the opening direction of the contact system (2), the contact system (2) comprising a moving contact (21) and a stationary contact (22), the housing (1) comprising a base (11) and a bottom plate (12), the moving contact (21) being mounted on the base (11), and the stationary contact (22) being mounted on the bottom plate (12), the stationary contact (22) comprising a conductive bar (221), the conductive bar (221) protruding outward from a corresponding notch on the housing (1); characterized in that: The sealing structure comprises a first sealing component (4), wherein the first sealing component (4) comprises a first sealing strip (41), wherein the first sealing strip (41) is arranged on a side of the conductive bar (221) close to the arc extinguishing chamber (3) to seal a gap on a side of the conductive bar (221) close to the arc extinguishing chamber (3).

2. The sealing structure of a circuit breaker according to claim 1, characterized in that: The conductive row (221) leads out toward the top of the circuit breaker, while the movable lead row of the movable contact (21) leads out toward the bottom of the circuit breaker.

3. The sealing structure of a circuit breaker according to claim 1, characterized in that: The first sealing assembly (4) further comprises a second sealing strip (42), and the first sealing strip (41) and the second sealing strip (42) surround the conductive bar (221) to form a sealing ring.

4. The sealing structure of a circuit breaker according to claim 3, characterized in that: The first sealing strip (41) is embedded in the first receiving groove (1111) of the base (11), and the second sealing strip (42) is embedded in the second receiving groove (1211) of the bottom plate (12).

5. The sealing structure of a circuit breaker according to claim 4, characterized in that: An end baffle (111) is provided on the base (11), and the first receiving groove (1111) is located on the end baffle (111).

6. The sealing structure of a circuit breaker according to claim 5, characterized in that: The bottom plate (12) is provided with a card slot (121), the card slot (121) is snap-fitted with the end baffle (111), and the second receiving slot (1211) is located on the card slot (121).

7. The sealing structure of a circuit breaker according to claim 4, characterized in that: A positioning hole (1112) is provided on the first receiving groove (1111), and the aperture size of the positioning hole (1112) is larger than the groove width size of the first receiving groove (1111); the first sealing strip (41) comprises a sealing strip body (411), and a positioning portion (4111) is provided on the sealing strip body (411), and the positioning portion (4111) is embedded and matched with the positioning hole (1112), so as to realize the positioning installation between the first sealing strip (41) and the first receiving groove (1111) of the end baffle (111).

8. The sealing structure of a circuit breaker according to claim 7, characterized in that: The positioning portion (4111) is circular, and correspondingly, the positioning hole (1112) is also circular.

9. The sealing structure of a circuit breaker according to claim 4, characterized in that: The second sealing strip (42) comprises a connecting portion (421) and a pair of side portions (422), wherein the connecting portion (421) connects one end of the pair of side portions (422) to form a "[" shape.

10. The sealing structure of a circuit breaker according to claim 9, characterized in that: An enlarged portion (423) is provided on the connecting portion (421), and the external dimension of the enlarged portion (423) is greater than the groove width dimension of the second accommodating groove (1211).

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