Draw-out type circuit breaker

Abstract

The utility model belongs to the technical field of circuit breakers, and discloses a draw-out type circuit breaker. The draw-out type circuit breaker comprises a frame body and a circuit breaker body, wherein the circuit breaker body has a first state of being installed on the frame body and a second state of being drawn out of the frame body; the circuit breaker body comprises a shell, a re-buckling mechanism and an interlocking mechanism, the re-buckling mechanism and the interlocking mechanism are arranged in the shell, the re-buckling mechanism comprises a traction rod, and the interlocking mechanism comprises a traction piece, an elastic piece and an ejector rod; one end of the traction piece is connected with the traction rod, the other end of the traction piece penetrates out of the shell to be connected with the ejector rod and is provided with an elastic piece, one end of the elastic piece abuts against the outer wall of the shell, and the other end of the elastic piece abuts against the ejector rod; when the circuit breaker body is in the first state, the frame body extrudes the ejector rod, the elastic piece is pressed, and the re-buckling mechanism can be normally re-buckled; when the circuit breaker body is in the second state, the frame body is separated from the ejector rod, the elastic piece elastically recovers, and the traction piece acts on the traction rod, so that the re-buckling mechanism cannot be normally re-buckled. According to the utility model, the electric shock of operators can be avoided, and the operation safety is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of circuit breakers, in particular to draw-out circuit breakers. Background Art

[0002] A draw-out circuit breaker is a high-voltage electrical equipment, mainly used to protect the power system from damage caused by faults such as overload and short circuit.

[0003] During normal operation of the draw-out circuit breaker, the circuit breaker body is locked in the frame body and remains in a conducting state with the circuit. When a short circuit or overload occurs in the circuit, the protection system will send a signal to trip the circuit breaker, thereby realizing the protection of the line and electrical appliances. When it is necessary to repair or replace the circuit breaker body, the operator can withdraw the circuit breaker body from the frame body to facilitate subsequent operations.

[0004] For the existing draw-out circuit breaker, after the operator withdraws the circuit breaker body from the frame body, if the circuit breaker body is still in the high-voltage line and the circuit breaker body can still perform reclosing operation and closing operation, it will pose an electric shock risk and certain potential safety hazards to the operator. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a draw-out circuit breaker, which is used to realize that after the draw-out circuit breaker is withdrawn from the frame body, the circuit breaker body cannot be reclosed again, so as to ensure that the line is always disconnected, avoid the electric shock risk of the operator, and improve the operation safety.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] A draw-out circuit breaker, comprising:

[0008] A frame body;

[0009] A circuit breaker body, which has a first state of being installed on the frame body and a second state of being withdrawn from the frame body; the circuit breaker body includes a housing and a reclosing mechanism and an interlocking mechanism arranged in the housing, the reclosing mechanism includes a traction rod, and the interlocking mechanism includes a traction member, an elastic member and a ejector rod;

[0010] One end of the traction member is connected to the traction rod, the other end passes through the housing and is connected to the ejector rod, the other end of the traction member is sleeved with the elastic member, one end of the elastic member abuts against the outer wall of the housing, and the other end abuts against the ejector rod;

[0011] When the circuit breaker body is in the first state, the frame presses the ejector rod, the elastic member is compressed, and the reclosing mechanism can be reclosed normally; when the circuit breaker body is in the second state, the frame is separated from the ejector rod, the elastic member elastically recovers, and the traction member acts on the traction rod so that the reclosing mechanism cannot be reclosed normally.

[0012] As an alternative solution for a draw-out circuit breaker, the interlocking mechanism further includes a fixing plate, one end of the fixing plate is connected to the traction rod, and the other end of the fixing plate is connected to the traction member.

[0013] As an alternative solution for a draw-out circuit breaker, the fixing plate includes a first plate, the first plate is provided with a first mounting hole, and a threaded fastener sequentially passes through the traction rod and the first mounting hole and is screwed to the first plate.

[0014] As an alternative solution for a draw-out circuit breaker, the fixing plate further includes a second plate, the second plate is arranged at an angle with the first plate, the second plate is provided with a second mounting hole, and one end of the traction member passes through the second mounting hole and is fixed by a limiting component.

[0015] As an alternative solution for a draw-out circuit breaker, the limiting component includes a fastening sleeve and a locking screw screwed to the fastening sleeve. The outer wall of the fastening sleeve is provided with a limiting hole, the limiting hole penetrates through the fastening sleeve, the traction member passes through the limiting hole and is tightened by the locking screw.

[0016] As an alternative solution for a draw-out circuit breaker, the housing includes a bottom plate, the traction member passes through the bottom plate, the interlocking mechanism further includes a support sleeve fixed on the outer side wall of the bottom plate, a partial structure of the ejector rod is arranged in the support sleeve, and the ejector rod is slidably connected with the support sleeve.

[0017] As an alternative solution for a draw-out circuit breaker, the ejector rod includes a limiting portion slidably arranged in the support sleeve and an abutting portion capable of being pressed against the frame. A limiting flange is arranged on one side of the support sleeve away from the bottom plate, and the limiting flange is used for limiting the limiting portion in the support sleeve.

[0018] As an alternative solution for a draw-out circuit breaker, a connecting plate is arranged at one end of the support sleeve close to the bottom plate, and the support sleeve is fixed on the bottom plate through the connecting plate.

[0019] As an alternative solution for a draw-out circuit breaker, a top block is arranged at the bottom of the frame, and the top block is used for pressing the ejector rod.

[0020] As an alternative solution for a draw-out circuit breaker, the traction member is a steel cable.

[0021] Beneficial effects:

[0022] In the present utility model, the circuit breaker body is installed on the frame and locked, that is, the circuit breaker body is in the first state. When the locking is in place, the relative position between the frame and the circuit breaker body will cause the frame to squeeze the ejector rod. At this time, the ejector rod is compressed by the extrusion force, the traction member moves a certain distance toward the side away from the frame, and no force is added to the traction rod, making the traction rod in a free state. The entire reclosing mechanism can work normally, that is, the circuit breaker can be reclosed and closed normally; when the locking structure is unlocked, the circuit breaker body is manually pulled away from the frame by a certain distance or completely pulled away, that is, the circuit breaker body is in the second state. At this time, the frame is separated from the ejector rod, the elastic member recovers its deformation, and drives the traction member to move back a certain distance. The traction member pulls the traction rod to rotate a certain angle. At this time, the traction member acts on the traction rod, making the traction rod in a non-free state. The entire reclosing mechanism is restricted by the traction member, and the reclosing mechanism cannot be reclosed normally. The circuit breaker is completely in the off state. Therefore, it can avoid the risk of electric shock for the operator when replacing or maintaining the circuit breaker body, improving the operation safety. In addition, the interlocking mechanism adds a traction member, an elastic member, and an ejector rod based on the overall structure, and the overall structure of the interlocking mechanism is simple. The function can be achieved after assembly without any extra operations. Description of the drawings

[0023] Figure 1 is a schematic structural diagram of the interlocking structure when the circuit breaker body is in the first state provided by the embodiment of the present utility model;

[0024] Figure 2 is a schematic structural diagram of the interlocking structure when the circuit breaker body is in the second state provided by the embodiment of the present utility model;

[0025] Figure 3 is a bottom view of the draw-out circuit breaker provided by the embodiment of the present utility model;

[0026] Figure 4 is a partial cross-sectional view of the draw-out circuit breaker provided by the embodiment of the present utility model.

[0027] In the figure:

[0028] 1. Frame; 11. Top block;

[0029] 2. Circuit breaker body; 21. Housing; 211. Bottom plate; 22. Interlocking mechanism; 221. Traction member; 222. Elastic member; 223. Ejector rod; 2231. Limiting portion; 2232. Abutting portion; 224. Fixed plate; 225. Support sleeve; 2251. Limiting flange; 2252. Connecting plate; 23. Traction rod; 24. Limiting assembly; 241. Fastening sleeve; 242. Locking screw. Specific embodiments

[0030] The present utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present utility model, rather than limiting the present utility model. In addition, it should be noted that for the sake of convenience of description, only the parts related to the present utility model rather than all the structures are shown in the accompanying drawings.

[0031] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0032] In the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features between them. Moreover, the first feature being "above", "over", and "on top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "beneath", and "underneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0033] In the description of this embodiment, the orientation or positional relationships such as "above", "below", "right", etc. are based on the orientation or positional relationships shown in the accompanying drawings. It is only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be understood as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for distinction in description and do not have special meanings.

[0034] Please refer to the attached Figure 1 - attached Figure 4 , this embodiment relates to a draw-out circuit breaker (hereinafter referred to as "circuit breaker"), which includes a frame body 1 and a circuit breaker body 2. The circuit breaker body 2 is detachably connected to the frame body 1, and can be fixed in the preset installation space of the frame body 1 through a locking mechanism and then locked to prevent the circuit breaker body 2 from loosening from the frame body 1, thereby affecting the working stability of the circuit breaker.

[0035] Specifically, the circuit breaker body 2 has a first state installed on the frame 1 and a second state pulled out from the frame 1; the circuit breaker body 2 includes a housing 21 and a reclosing mechanism and an interlocking mechanism 22 provided inside the housing 21. The reclosing mechanism includes a traction rod 23, and the interlocking mechanism 22 includes a traction member 221, an elastic member 222, and a push rod 223. One end of the traction member 221 is connected to the traction rod 23, and the other end passes through the housing 21 and is connected to the push rod 223. The elastic member 222 is sleeved on the other end of the traction member 221. One end of the elastic member 222 abuts against the outer wall of the housing 21, and the other end abuts against the push rod 223. When the circuit breaker body 2 is in the first state, the frame 1 presses the push rod 223, the elastic member 222 is compressed, and the reclosing mechanism can be reclosed normally. When the circuit breaker body 2 is in the second state, the frame 1 is separated from the push rod 223, the elastic member 222 elastically recovers, and the traction member 221 acts on the traction rod 23, so that the reclosing mechanism cannot be reclosed normally.

[0036] In this embodiment, when the circuit breaker body 2 is in the first state, the circuit breaker body 2 is completely locked on the frame 1 through the locking mechanism and can work in the power line connection. When the circuit breaker body 2 is in the second state, it is unlocked through the locking mechanism, and the operator can manually pull out the circuit breaker body 2 from the frame 1, so as to facilitate the maintenance or replacement of the circuit breaker body 2.

[0037] The housing 21 is a plastic shell structure and is formed by using a die injection molding process. The housing 21 includes an upper shell and a bottom shell, and the bottom shell forms a space for installing the reclosing mechanism and the interlocking mechanism 22. The reclosing mechanism is an important part of the circuit breaker operating mechanism. The main function of the reclosing mechanism is to restore the normal operation of the circuit and avoid the circuit interruption caused by the circuit breaker tripping. After the power system fault is repaired in time, the circuit breaker can be reclosed through the reclosing operation to restore the power transmission.

[0038] In this embodiment, the traction member 221 in the interlocking mechanism 22 can be a steel cable with a certain rigidity and bending strength. One end of the traction member 221 is connected to the traction rod 23 and can act on the traction rod 23 to make the traction rod 23 rotate, so as to play a restraining role on the reclosing mechanism. The elastic member 222 can be an ordinary spring and is connected to the frame 1 and the push rod 223 at both ends respectively.

[0039] The installation process and basic principle of this circuit breaker will be specifically described below. First, the circuit breaker body 2 is manually installed on the frame 1 and locked, that is, the circuit breaker body 2 is in the first state. When the locking is in place, the relative position between the frame 1 and the circuit breaker body 2 will cause the frame 1 to squeeze the ejector rod 223. At this time, the ejector rod 223 is compressed under the action of the squeezing force, and the traction member 221 moves a certain distance toward the side away from the frame 1. At this time, the traction member 221 does not apply an additional force to the traction rod 23, making the traction rod 23 in a free state, and the entire reclosing mechanism can work normally, that is, the circuit breaker can be normally reclosed and closed; when the locking structure is unlocked, the circuit breaker body 2 is manually pulled away from the frame 1 by a certain distance or completely pulled away, that is, the circuit breaker body 2 is in the second state. At this time, the frame 1 is separated from the ejector rod 223, and the elastic member 222 resumes deformation and drives the traction member 221 to move a certain distance in the reverse direction. At this time, the traction member 221 can pull the traction rod 23 to rotate by a certain angle. The traction member 221 acts on the traction rod 23, making the traction rod 23 in a non-free state. The entire reclosing mechanism is restricted by the traction member 221, and the reclosing mechanism cannot be normally reclosed, and the circuit breaker is completely in the off state, thus avoiding electric shock accidents when the operator replaces or maintains the circuit breaker body 2 and improving the operation safety. In addition, the interlocking mechanism 22 adds a traction member 221, an elastic member 222, and an ejector rod 223 based on the overall structure, and the overall structure of the interlocking mechanism 22 is simple. The function can be realized after assembly without redundant operations.

[0040] Optionally, the interlocking mechanism 22 further includes a fixing plate 224. One end of the fixing plate 224 is connected to the traction rod 23, and the other end of the fixing plate 224 is connected to the traction member 221.

[0041] In this embodiment, one end of the traction member 221 is fixed to the traction rod 23 through the fixing plate 224. The traction member 221 is a steel cable, and the traction member 221 can be connected to the fixing plate 224 in a variety of connection ways. Exemplarily, it can be connected by threaded connection or clamping. Those skilled in the art can understand that by reasonably optimizing the structure of the fixing plate 224 and designing the relative fixed position of the fixing plate 224 and the traction rod 23, the direction of the acting force between the traction member 221 and the traction rod 23 can be conveniently adjusted, and the angle at which the traction member 221 pulls the traction rod 23 can be flexibly adjusted.

[0042] Optionally, the fixing plate 224 includes a first plate. The first plate is provided with a first mounting hole, and the threaded fastener sequentially passes through the traction rod 23 and the first mounting hole and is screwed to the first plate.

[0043] In this embodiment, the threaded fastener can be a screw. The first mounting hole is provided with internal threads. The screw passes through the first plate and is screwed into the first mounting hole to complete the relative fixation between the fixing plate 224 and the traction rod 23. Of course, in other embodiments, when the installation space conditions permit, the first mounting hole can be machined into a smooth hole. The screw first passes through the first mounting hole and then is screwed to the traction rod 23, which can also achieve the purpose of relatively fixing the fixing plate 224 and the traction rod 23.

[0044] Further, the fixing plate 224 further includes a second plate. The second plate is arranged at an angle with the first plate. The second plate is provided with a second mounting hole. One end of the traction member 221 passes through the second mounting hole, and the traction member 221 is fixed by the limiting component 24.

[0045] In this embodiment, the second plate is arranged at a right angle to the first plate, that is, the two are in an L shape. The first plate and the second plate are of an integral structure. The entire fixing plate 224 can be formed by bending a metal plate. Those skilled in the art can understand that by adjusting the relative angle between the second plate and the first plate, it is convenient to adjust the fixing position of the traction member 221 relative to the traction rod 23. Furthermore, during the assembly process, it is convenient to adjust the acting force direction between the traction member 221 and the traction rod 23, and the angle at which the traction member 221 pulls the traction rod 23 can be flexibly adjusted.

[0046] Further, the limiting component 24 includes a fastening sleeve 241 and a locking screw 242 screwed to the fastening sleeve 241. A limiting hole is provided on the outer wall of the fastening sleeve 241. The limiting hole penetrates through the fastening sleeve 241. The traction member 221 passes through the limiting hole and is tightened by the locking screw 242.

[0047] In this embodiment, the fastening sleeve 241 is of a cylindrical structure. An internal thread for screwing cooperation with the locking screw 242 is provided inside the fastening sleeve 241. The size of the limiting hole is adapted to the size of the traction member 221. The limiting hole completely penetrates through the fastening sleeve 241, that is, it extends from one side of the fastening sleeve 241 to the other side, so that the traction member 221 penetrates into the limiting hole from one side and exits from the other side. After adjusting the relative position between the fastening sleeve 241 and the traction member 221, the traction member 221 is locked in the fastening sleeve 241 by the locking screw 242. When the frame 1 is separated from the ejector rod 223, the elastic member 222 elastically returns, and the traction member 221 pulls the fastening sleeve 241, so that the fastening sleeve 241 acts on the second plate to rotate the traction rod 23.

[0048] Optionally, the housing 21 includes a bottom plate 211. The traction member 221 passes through the bottom plate 211. The interlocking mechanism 22 further includes a support sleeve 225 fixed on the outer side wall of the bottom plate 211. A partial structure of the ejector rod 223 is arranged inside the support sleeve 225, and the ejector rod 223 is slidably connected to the support sleeve 225.

[0049] In this embodiment, the bottom plate 211 is a plate-shaped member located at the bottom of the circuit breaker. One end of the traction member 221 away from the traction rod 23 passes through the bottom plate 211 and is connected to one end of the ejector rod 223. Part of the structure of the ejector rod 223, the traction member 221, and the elastic member 222 are all arranged inside the support sleeve 225. In the first state, the frame body 1 presses the ejector rod 223, the ejector rod 223 compresses the elastic member 222, and the ejector rod 223 drives the traction member 221 to move a certain distance towards the traction rod 23. In the second state, the frame body 1 releases the ejector rod 223, the elastic member 222 reacts on the ejector rod 223, and the ejector rod 223 drives the traction member 221 to move a certain distance in the reverse direction.

[0050] Optionally, the ejector rod 223 includes a limiting portion 2231 slidably arranged inside the support sleeve 225 and an abutting portion 2232 that can be pressed against the frame body 1. A limiting flange 2251 is provided on one side of the support sleeve 225 away from the bottom plate 211, and the limiting flange 2251 is used to limit the limiting portion 2231 inside the support sleeve 225.

[0051] In this embodiment, the ejector rod 223 is a cylindrical rod, wherein the diameter of the limiting portion 2231 is larger than the diameter of the abutting portion 2232. Through the limiting flange 2251, the limiting portion 2231 can always be located inside the support sleeve 225, and the abutting portion 2232 can expand and contract in the circular hole formed by the limiting flange 2251.

[0052] Optionally, a connecting plate 2252 is provided at one end of the support sleeve 225 close to the bottom plate 211, and the support sleeve 225 is fixed on the bottom plate 211 through the connecting plate 2252.

[0053] In this embodiment, the connecting plate 2252 is formed by extending outward from the outer wall of the support sleeve 225. One connecting plate 2252 is provided on each of the symmetrical sides of the support sleeve 225, and then the support sleeve 225 is fixed by screwing a screw through the connecting plate 2252 and the bottom plate 211. In this embodiment, the connecting plate 2252 is integrally formed on the support sleeve 225. Of course, a connecting flange can also be formed on the outer wall of the support sleeve 225 to achieve the same connection effect.

[0054] Optionally, a top block 11 is provided at the bottom of the frame body 1, and the top block 11 is used to press the ejector rod 223.

[0055] At the position of the frame body 1 corresponding to the ejector rod 223, the top block 11 is screwed. The top block 11 is a metal block to improve wear resistance. When the circuit breaker body 2 is in the first state, the top block 11 can be relative to the ejector rod 223 and press the ejector rod 223.

[0056] Obviously, the above embodiments of the present utility model are merely examples for clearly illustrating the present utility model, rather than limitations on the implementation manners of the present utility model. For those of ordinary skill in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present utility model. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present utility model shall be included within the protection scope of the claims of the present utility model.

Claims

1. Draw-out circuit breaker, characterized in that, Comprising: A frame body (1); A circuit breaker body (2), the circuit breaker body (2) having a first state mounted on the frame body (1) and a second state pulled out of the frame body (1); the circuit breaker body (2) includes a housing (21) and a reclosing mechanism and an interlocking mechanism (22) provided in the housing (21), the reclosing mechanism includes a traction rod (23), and the interlocking mechanism (22) includes a traction member (221), an elastic member (222) and a push rod (223); One end of the traction member (221) is connected to the traction rod (23), and the other end passes through the housing (21) and is connected to the push rod (223). The elastic member (222) is sleeved on the other end of the traction member (221). One end of the elastic member (222) abuts against the outer wall of the housing (21), and the other end abuts against the push rod (223); When the circuit breaker body (2) is in the first state, the frame body (1) presses the push rod (223), the elastic member (222) is compressed, and the reclosing mechanism can be reclosed normally; When the circuit breaker body (2) is in the second state, the frame body (1) is separated from the push rod (223), the elastic member (222) elastically recovers, and the traction member (221) acts on the traction rod (23) so that the reclosing mechanism cannot be reclosed normally.

2. The draw-out circuit breaker according to claim 1, wherein The interlocking mechanism (22) further includes a fixing plate (224), one end of the fixing plate (224) is connected to the traction rod (23), and the other end of the fixing plate (224) is connected to the traction member (221).

3. The draw-out circuit breaker according to claim 2, wherein, The fixing plate (224) includes a first plate, the first plate is provided with a first mounting hole, and a threaded fastener sequentially passes through the traction rod (23) and the first mounting hole and is screwed to the first plate.

4. The draw-out circuit breaker according to claim 3, characterized in that The fixing plate (224) further includes a second plate, the second plate is arranged at an angle with the first plate, the second plate is provided with a second mounting hole, and one end of the traction member (221) passes through the second mounting hole, and the traction member (221) is fixed by a limiting component (24).

5. The draw-out circuit breaker according to claim 4, characterized in that, The limiting component (24) includes a fastening sleeve (241) and a locking screw (242) screwed to the fastening sleeve (241). A limiting hole is provided on the outer wall of the fastening sleeve (241), the limiting hole penetrates through the fastening sleeve (241), the traction member (221) passes through the limiting hole, and is tightened by the locking screw (242).

6. The draw-out circuit breaker according to claim 1, characterized in that, The housing (21) includes a bottom plate (211), the traction member (221) passes through the bottom plate (211), the interlocking mechanism (22) further includes a support sleeve (225) fixed on the outer side wall of the bottom plate (211), a partial structure of the push rod (223) is arranged in the support sleeve (225), and the push rod (223) is slidably connected to the support sleeve (225).

7. The draw-out circuit breaker according to claim 6, wherein, The ejector rod (223) includes a limiting portion (2231) slidably disposed in the support sleeve (225) and an abutting portion (2232) capable of pressing against the frame body (1). A limiting flange (2251) is provided on one side of the support sleeve (225) away from the bottom plate (211), and the limiting flange (2251) is used to limit the limiting portion (2231) within the support sleeve (225).

8. The draw-out circuit breaker according to claim 6, wherein, A connecting plate (2252) is provided at one end of the support sleeve (225) close to the bottom plate (211), and the support sleeve (225) is fixed to the bottom plate (211) through the connecting plate (2252).

9. The draw-out circuit breaker according to claim 1, characterized in that, A top block (11) is provided at the bottom of the frame body (1), and the top block (11) is used to press the ejector rod (223).

10. The draw-out circuit breaker according to any one of claims 1-9, characterized in that, The traction member (221) is a steel cable.

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