Air-blowing tripping structure and circuit breaker

Abstract

The utility model relates to an air-blowing tripping structure and a circuit breaker, and the air-blowing tripping structure comprises a housing which is located between two adjacent breaking units of the circuit breaker; one end of the ejector rod is located in the shell and rotationally connected with the shell, the other end of the ejector rod is located outside the shell and corresponds to a push rod of a circuit breaker operating mechanism, the two sides of the ejector rod make contact with the inner wall of the shell to divide the interior of the shell into a gas collection cavity and a movable cavity, and the gas collection cavity is communicated with an arc extinguish chamber of the breaking unit; the limiting structure is fixedly arranged in the gas collecting cavity; the spring is used for elastically connecting the ejector rod with the shell, and the limiting structure is used for limiting the ejector rod, so that the spring is in a compressed state; the gas from the arc extinguish chamber enters the gas collection cavity and pushes the push rod, so that the push rod overcomes the elastic force of the spring to swing, and the push rod pushes the push rod to separate the moving contact and the static contact of the circuit breaker. Therefore, the performance requirement of the circuit breaker with high breaking capacity is met, the action range and force of the blowing mechanism are increased, and the sensitivity of the air-blowing tripping mechanism and the safety performance of the circuit breaker are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to circuit breaker technical field especially a kind of air blow tripping structure and circuit breaker. BACKGROUND

[0002] Circuit breaker is an important device for protecting power supply safety, and the air blowing mechanism used in circuit breaker pushes the operating mechanism of circuit breaker by the airflow in arc-extinguishing chamber, so that the operating mechanism is tripped and separated, thereby breaking the circuit, which helps to improve the segmentation capacity.

[0003] With the rapid development of new energy field in China, there is a higher requirement for breaking capacity and breaking voltage of circuit breaker, in order to improve the segmentation capacity of circuit breaker, when air blowing mechanism is arranged in circuit breaker, the action range and strength of moving part in conventional air blowing mechanism are insufficient, so that the ability of air blowing mechanism to trigger operating mechanism cannot meet the use requirement, and there is a safety risk. INVENTION CONTENTS

[0004] The applicant provides a kind of air blow tripping structure and circuit breaker to adapt to the performance requirement of high breaking capacity circuit breaker, increase the action range and strength of air blowing mechanism, and improve the sensitivity of air blow tripping mechanism and the safety performance of circuit breaker, in view of the above-mentioned shortcomings in prior production technology.

[0005] The technical scheme adopted by the utility model is as follows:

[0006] A kind of air blow tripping structure, for double-break circuit breaker, the air blow tripping structure includes:

[0007] Housing, between the adjacent two breaking units of the circuit breaker;

[0008] Top rod, one end of the top rod is located in the housing and is rotationally connected with the housing, the other end of the top rod is located outside the housing, corresponding to the push rod of the circuit breaker operating mechanism, the two sides of the top rod are in contact with the inner wall of the housing to divide the housing into gas collection cavity and movable cavity, the gas collection cavity is communicated with the arc-extinguishing chamber of the breaking unit;

[0009] Limiting structure, fixedly arranged in gas collection cavity;

[0010] Spring, the spring elastically connects the top rod and the housing, the limiting structure limits the top rod, so that the spring is in compression state;

[0011] Wherein, the gas from the arc-extinguishing chamber enters the gas collection cavity and pushes the top rod, so that the top rod swings against the elastic force of the spring, the top rod pushes the push rod to separate the moving contact and the static contact of the circuit breaker.

[0012] As a further improvement of the above technical solution:

[0013] The shell comprises a box-shaped base shell and a shell cover, the inner side bottom of the base shell is provided with a first through hole, which is in communication with the discharge hole on the adjacent breaking unit;

[0014] The shell cover is provided with a second through hole opposite to the first through hole, which is in communication with the discharge hole on the other adjacent breaking unit;

[0015] One end of the top rod rotationally connected with the shell is adjacent to the first through hole and the second through hole.

[0016] An insulating baffle is arranged in the shell, and the insulating baffle is located between the first through hole and the second through hole.

[0017] The top rod comprises a bearing part in contact with the limiting structure, one end of the bearing part is provided with an action head, the other end of the bearing part is provided with a rotary connection part, the rotary connection part is rotationally connected with the shell, and the action head is located outside the shell and corresponds to the push rod;

[0018] One side of the bearing part is used for direct contact with the gas, the other side of the bearing part is connected with the spring, and the cross-sectional dimension of the bearing part is greater than the cross-sectional dimension of the limiting structure and the action head.

[0019] The bearing part is provided with a notch facing the gas collection cavity, and the direction of the notch is opposite to the flow direction of the gas.

[0020] A pair of guide pieces are arranged in the gas collection cavity in a staggered manner along the gas flow direction, so that the gas flows in an s shape in the gas collection cavity, and the included angle between the gas and the top rod when the gas acts on the top rod is increased.

[0021] A circular arc surface is arranged in the shell, and the circular arc surface is used for changing the flow direction of the gas passing through the guide piece, so that the gas flows directly against the top rod.

[0022] Protrusions are arranged on both sides of the shell, and the protrusions are inserted into the recesses on the adjacent breaking units;

[0023] The outer end surface of the first through hole and the second through hole is provided with an insertion ring protruding outside the shell, and the insertion ring is in communication with the discharge hole through the first through hole and the second through hole behind the shell.

[0024] The operating mechanism is in transmission connection with the movable contact, and the operating mechanism comprises a jump buckle in transmission connection with the movable contact in the breaking unit, and further comprises a lock buckle and a push rod.

[0025] When the movable contact and the static contact are in contact, the jump buckle, the lock buckle and the push rod are sequentially buckled.

[0026] When the top rod pushes the push rod, the push rod is separated from the lock catch after rotating, and then the lock catch is separated from the jump catch, so that the movable contact is separated from the static contact after rotating.

[0027] A circuit breaker comprising the blow-out trip structure of any one of the above.

[0028] The utility model discloses the beneficial effects are as follows:

[0029] The utility model discloses compact, reasonable, convenient operation, through the one end of top rod and shell hinged, increase the swing amplitude of top rod in limited space, increase the distance of the contact position and hinged position of top rod and gas simultaneously, make full use of the power of gas, increase the action amplitude and strength of blowing mechanism, improve the sensitivity of blow-out trip structure and the safety performance of circuit breaker, adapt to the performance requirement of high breaking capacity circuit breaker.

[0030] The utility model also includes the following advantages:

[0031] (1) rotation connecting part, bearing part and action head are sequentially arranged along the axial direction of top rod, the sectional size of bearing part is increased, the structural strength of top rod is guaranteed, and the service life of blow-out trip structure is improved.

[0032] (2) the gas in the gas collecting cavity is shaped flow by sequentially arranging the guide and the circular arc surface along the flow path of the gas, the included angle of the gas and the top rod is increased when the gas acts on the top rod, the recess opposite to the flow direction of the gas is arranged on the bearing part of the top rod, the thrust generated by the gas flow is fully applied to the bearing part, and the utilization efficiency of the gas energy is improved. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 It is the structural schematic diagram of the utility model.

[0034] Figure 2 It is the explosion drawing of the utility model.

[0035] Figure 3 It is the structural schematic diagram of the utility model shell and top rod.

[0036] Figure 4 It is the structural schematic diagram of the utility model shell and top rod (another view).

[0037] Figure 5 It is the structural schematic diagram of the utility model shell and top rod (explosion drawing).

[0038] Figure 6 It is the structural schematic diagram of the utility model shell (not including base shell).

[0039] Figure 7 It is the structural schematic diagram of the utility model top rod (not including base shell).

[0040] Figure 8 Figure 1 is a schematic view of the utility model in a working state.

[0041] Wherein:

[0042] 1, operating mechanism; 11, push rod; 12, lock catch; 13, jump catch; 11, push rod;

[0043] 2, ejector rod; 21, action head; 22, bearing part; 23, rotary connection part; 24, notch;

[0044] 3, shell; 30, opening; 31, base shell; 32, shell cover; 33, limiting structure; 34, first through hole; 35, second through hole; 36, guide; 37, circular arc surface; 38, protruding block;

[0045] 4, breaking unit; 41, discharge hole; 42, dimple;

[0046] 5, spring; 6, insulating baffle. DETAILED DESCRIPTION

[0047] The specific implementation of the utility model will be described below in combination with the drawings.

[0048] As Figures 1-3 shown, the air-blast tripping structure provided by the embodiment of the application is used for a double-break point circuit breaker, and the air-blast tripping structure comprises a shell 3, an ejector rod 2, a limiting structure 33 and a spring 5.

[0049] The shell 3 is located between two adjacent breaking units 4 of the circuit breaker.

[0050] The ejector rod 2 is rotatably connected to the shell 3 at one end and is located outside the shell 3 at the other end, corresponding to a push rod 11 of an operating mechanism 1 of the circuit breaker, and the two sides of the ejector rod 2 are in contact with the inner wall of the shell 3 to divide the shell 3 into a gas collection cavity and a movable cavity, and the gas collection cavity is in communication with an arc extinguishing chamber of the breaking unit 4.

[0051] The limiting structure 33 is fixedly arranged in the gas collection cavity.

[0052] The spring 5 elastically connects the ejector rod 2 and the shell 3, and the limiting structure 33 limits the ejector rod 2 so that the spring 5 is in a compressed state.

[0053] The gas from the arc extinguishing chamber enters the gas collection cavity and pushes the ejector rod 2, so that the ejector rod 2 swings against the elastic force of the spring 5, and the ejector rod 2 pushes the push rod 11 to separate the moving contact and the stationary contact of the circuit breaker.

[0054] The shell 3 is provided with an opening 30, and the ejector rod 2 swings within the range of the opening 30.

[0055] One end of the ejector rod 2 is hinged to the shell 3, which increases the swing range of the ejector rod 2 in the limited space, increases the distance between the contact position of the ejector rod 2 and the hinged position, fully utilizes the force of the gas, increases the action range and strength of the gas blowing mechanism, improves the sensitivity of the gas blowing tripping mechanism and the safety performance of the circuit breaker, and meets the performance requirements of the high breaking capacity circuit breaker.

[0056] In an exemplary embodiment, as shown in Figures 3-6 The shell 3 includes a box-shaped base shell 31 and a shell cover 32. The inner side of the bottom of the base shell 31 is provided with a first through hole 34, which is in communication with the exhaust hole 41 on the adjacent breaking unit 4.

[0057] The shell cover 32 is provided with a second through hole 35 opposite to the first through hole 34, which is in communication with the exhaust hole 41 on the other adjacent breaking unit 4.

[0058] One end of the ejector rod 2 connected to the shell 3 is adjacent to the first through hole 34 and the second through hole 35.

[0059] An insulating baffle 6 is arranged in the shell 3, and the insulating baffle 6 is located between the first through hole 34 and the second through hole 35.

[0060] Exemplarily, the insulating baffle 6 is made of NOMAX or white steel paper board, which is a kind of aramid fiber material commonly known as NOMAX paper, has excellent high temperature resistance, corrosion resistance and flame retardant performance, and is arranged between the first through hole 34 and the second through hole 35 to change the gas flow path and play the role of arc blocking.

[0061] In an exemplary embodiment, as shown in Figures 5-7 The ejector rod 2 includes a bearing part 22 in contact with the limiting structure 33. One end of the bearing part 22 is provided with an action head 21, and the other end of the bearing part 22 is provided with a rotating connection part 23. The rotating connection part 23 is rotatably connected to the shell 3, and the action head 21 is located outside the shell 3 and corresponds to the push rod 11.

[0062] One side of the bearing part 22 is used for direct contact with the gas, and the other side of the bearing part 22 is connected with the spring 5. The cross-sectional dimension of the bearing part 22 is greater than the cross-sectional dimension of the limiting structure 33 and the action head 21.

[0063] Exemplarily, the rotating connection part 23 is a cylindrical structure, and a circular clamping groove is arranged on the shell 3 to rotatably connect the rotating connection part 23 with the shell 3.

[0064] The rotating connection part 23, the bearing part 22 and the action head 21 are arranged in sequence along the axial direction of the ejector rod 2. By increasing the cross-sectional dimension of the bearing part 22, the structural strength of the ejector rod 2 is ensured, and the service life of the gas blowing tripping structure is improved.

[0065] In another exemplary embodiment, as shown in Figures 5-7 The bearing portion 22 is provided with a recess 24 facing the gas collection cavity, and the recess 24 faces the gas flow direction.

[0066] The recess 24 on the bearing portion 22 faces the gas flow direction, and the thrust generated by the gas flow is fully applied to the bearing portion 22, improving the utilization efficiency of gas energy.

[0067] In another exemplary embodiment, as shown in Figures 5-6 A pair of guide members 36 are arranged in the gas collection cavity along the gas flow direction, so that the gas flows in an s shape in the gas collection cavity, increasing the angle between the gas and the ejector rod 2.

[0068] Specifically, the guide member 36 is arranged on the base shell 31 and located at the middle position of the gas collection cavity.

[0069] In this embodiment, the shell 3 is provided with a circular arc surface 37, which is used to change the flow direction of the gas passing through the guide member 36, so that the gas flows directly against the ejector rod 2.

[0070] Specifically, the circular arc surface 37 is located on the base shell 31 and opposite to the recess 24 on the ejector rod 2.

[0071] By arranging the guide member 36 and the circular arc surface 37 in the gas collection cavity along the gas flow path in sequence, the gas in the gas collection cavity flows in an s shape, increasing the angle between the gas and the ejector rod 2. The recess 24 opposite to the gas flow direction is arranged on the bearing portion 22 of the ejector rod 2, so that the thrust generated by the gas flow is fully applied to the bearing portion 22, improving the utilization efficiency of gas energy.

[0072] In an exemplary embodiment, as shown in Figures 2-4 The shell 3 is provided with a protrusion 38 on both sides, and the protrusion 38 is inserted into the recess 42 on the adjacent breaking unit 4.

[0073] The outer end surface of the first through hole 34 and the second through hole 35 is provided with a plug ring protruding outside the shell 3, and the plug ring is in communication with the first through hole 34 and the second through hole 35 and the vent hole 41 of the shell 3.

[0074] In order to ensure the sealing effect of the gas passing through the through hole, a sealing ring can be arranged on the plug ring.

[0075] In an exemplary embodiment, as shown in Figure 8 The operating mechanism 1 is in transmission connection with the movable contact, and the operating mechanism 1 includes a jump buckle 13 in transmission connection with the movable contact in the breaking unit 4, and further includes a lock buckle 12 and a push rod 11.

[0076] When the movable contact and the static contact are in contact, the jump buckle 13, the lock buckle 12 and the push rod 11 are sequentially buckled.

[0077] When the top rod 2 pushes the push rod 11, the push rod 11 is separated from the lock catch 12 after rotating, and then the lock catch 12 is separated from the jump catch 13, so that the movable contact is separated from the static contact after rotating.

[0078] The structure of the operating mechanism 1 is a conventional design, and the embodiment will not be described again.

[0079] In one exemplary embodiment, the application provides a circuit breaker comprising the arc blow release structure of any one of the above embodiments.

[0080] The above description is an explanation of the utility model, not a limitation of the utility model, the range defined by the utility model is seen from the claims, and any form of modification is allowed within the protection range of the utility model.

Claims

1. A gas blast trip structure, characterized by: The air-blast tripping structure for the double-break circuit breaker comprises: a housing (3) located between two adjacent break units (4) of the circuit breaker; a top rod (2) having one end located in the housing (3) and being rotationally connected with the housing (3), and the other end located outside the housing (3) and corresponding to a push rod (11) of an operating mechanism (1) of the circuit breaker, the two sides of the top rod (2) being in contact with the inner wall of the housing (3) to divide the inside of the housing (3) into a gas collecting cavity and a movable cavity, and the gas collecting cavity being in communication with an arc extinguishing chamber of the break unit (4); a limiting structure (33) fixedly arranged in the gas collecting cavity; a spring (5) elastically connecting the top rod (2) and the housing (3), and the limiting structure (33) limiting the top rod (2) so that the spring (5) is in a compressed state; wherein the gas from the arc extinguishing chamber enters the gas collecting cavity and pushes the top rod (2) to swing against the elastic force of the spring (5), and the top rod (2) pushes the push rod (11) to separate the moving contact and the stationary contact of the circuit breaker.

2. The trip structure of claim 1, wherein: The housing (3) comprises a box-shaped base housing (31) and a housing cover (32), the inner bottom of the base housing (31) is provided with a first through hole (34) in communication with a discharge hole (41) on the adjacent break unit (4); the housing cover (32) is provided with a second through hole (35) opposite to the first through hole (34), the second through hole (35) being in communication with a discharge hole (41) on the other adjacent break unit (4); one end of the top rod (2) rotationally connected with the housing (3) is adjacent to the first through hole (34) and the second through hole (35).

3. The trip structure of claim 2, wherein: An insulating baffle (6) is arranged in the housing (3) and located between the first through hole (34) and the second through hole (35).

4. The trip structure of claim 1, wherein: The top rod (2) comprises a bearing part (22) in contact with the limiting structure (33), one end of the bearing part (22) is provided with an action head (21), and the other end of the bearing part (22) is provided with a rotationally connected part (23) rotationally connected with the housing (3), and the action head (21) is located outside the housing (3) and corresponds to the push rod (11); one side of the bearing part (22) is used for directly contacting with the gas, the other side of the bearing part (22) is connected with the spring (5), and the cross-sectional dimension of the bearing part (22) is greater than the cross-sectional dimension of the limiting structure (33) and the action head (21).

5. The trip structure of claim 4, wherein: The bearing part (22) is provided with a notch (24) facing the gas collecting cavity, and the facing direction of the notch (24) is opposite to the flow direction of the gas.

6. The trip structure of claim 1, wherein: A pair of guide members (36) are arranged in the gas collecting cavity in a staggered manner along the flow direction of the gas, so that the gas flows in an s shape in the gas collecting cavity, and the included angle between the gas and the top rod (2) is increased when the gas acts on the top rod (2).

7. The trip structure of claim 6, wherein: The shell (3) is provided with a circular arc surface (37) for changing the flow direction of the gas passing through the guide (36) so that the gas flows directly against the ejector rod (2).

8. The trip structure of claim 1, wherein: The shell (3) is provided with a protrusion (38) on both sides, which is inserted into the recess (42) on the adjacent breaking unit (4); The outer end surface of the first through hole (34) and the second through hole (35) is provided with an insertion ring protruding outside the shell (3), which is in communication with the first through hole (34) and the second through hole (35) and the vent hole (41) behind the shell (3).

9. The trip structure of claim 1, wherein: The operating mechanism (1) is in transmission connection with the movable contact, and the operating mechanism (1) comprises a jump buckle (13) in transmission connection with the movable contact in the breaking unit (4), and further comprises a lock buckle (12) and a push rod (11); When the movable contact and the static contact are in contact, the jump buckle (13), the lock buckle (12) and the push rod (11) are sequentially buckled; When the ejector rod (2) pushes the push rod (11), the push rod (11) is separated from the lock buckle (12) after rotating, and then the lock buckle (12) is separated from the jump buckle (13), so that the movable contact is separated from the static contact after rotating.

10. A circuit breaker characterized by: The air-blast release structure comprises the air-blast release structure according to any one of claims 1-9.

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