An oil-immersed circuit breaker with adjustable overcurrent protection structure

Abstract

The present invention provides an oil-immersed circuit breaker with an adjustable overcurrent protection structure, including a limit plate, a jumper, a re-clip structure and a temperature sensing element structure arranged on a housing, the re-clip structure including a re-clip and a first spring, the temperature sensing element structure having a driving portion extending on the movement path of the re-clip, the first spring providing elastic force to make the re-clip respectively press against the driving portion and the jumper, and the temperature sensing element structure pushes the re-clip to move away from the jumper when being bent by heat, so that the jumper is separated from the re-clip and then switches from a locked state to a tripped state. With this technical solution, by providing a re-clip structure between the temperature sensing element structure and the jumper to replace the temperature sensing element structure, the jumper is positioned and released, so that the re-clip is positioned and matched with the jumper by the spring force, and has a good positioning and anti-loosening effect, thereby ensuring the overload protection function of the circuit breaker and improving the safety of product use.

Description

Technical Field

[0001] The invention relates to the technical field of low-voltage electrical appliances, and in particular to an oil-immersed circuit breaker with an adjustable overcurrent protection tripping structure. Background Art

[0002] Oil-immersed circuit breakers are electrical switchgear that use high-insulation oil as a medium. Oil is widely used in power systems and industrial fields. In power systems, oil-immersed circuit breakers are mainly used for the protection and control of power transmission and distribution networks. They can cut off and isolate fault currents in circuits to protect power equipment and personal safety. When the circuit is working normally, the circuit breaker can achieve functions such as power outages, power supply, and circuit conversion by closing or disconnecting the circuit that supplies power. When the circuit is overloaded, loses voltage, is undervoltage, or is short-circuited, the circuit breaker can automatically cut off the circuit to avoid endangering the safety of workers and the normal operation of equipment due to circuit failures.

[0003] For example, Chinese patent document CN212695107U discloses an oil-immersed circuit breaker, comprising a passive contact charging mechanism, an active contact charging mechanism, a tripping mechanism, a limit card plate and an alarm trigger installed on an insulating bracket, wherein the active contact charging mechanism includes an active contact assembly, a bimetallic strip and a card, the bimetallic strip is electrically connected to the active contact assembly, one end of the card is fixedly connected to one end of the bimetallic strip, and the other end of the card is a card end; the tripping mechanism comprises a first card head and a second card head rotatably installed on the insulating bracket, the first card head and the second card head can both be engaged with the card end of the card, and its overload tripping working process is as follows: when the bimetallic strip is bent, the card end of the card is driven to move in a direction away from the first card head and the second card head, when the second card head is separated from the card, the second card head and the active contact assembly are both separated from the restriction of the limit card plate, the active contact assembly is separated from the passive contact charging mechanism, and the opening action is realized.

[0004] It can be seen from the overload release structure of the above-mentioned oil-immersed circuit breaker that it still has the following problems: the overall connection length between the bimetallic strip and the card is made relatively long, and the card end is directly buckled with the first clamp head and the second clamp head. First, the entire force arm of this structure is too long, which is easily caused by vibration to cause the card end to shake, and there is a risk of slippage. Secondly, since the circuit breaker works immersed in insulating oil, the increase in oil temperature will cause the bimetallic strip to be slightly deformed, which will cause the buckle surface between the card end and the first clamp head and the second clamp head to be reduced, which is also prone to the risk of slippage, resulting in the failure of the overload protection function and affecting the safety of product use. Summary of the invention

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the problem in the prior art that the bimetallic strip is directly clamped on the first clamp head and the second clamp head through a card. This structure easily causes the card to slip, resulting in failure of the overload protection function and affecting the safety of product use.

[0006] In order to solve the above technical problems, the present invention provides an oil-immersed circuit breaker with an adjustable overcurrent protection structure, comprising a limit plate and a tripping member rotatably arranged on a housing, wherein the limit plate is extended on the movement path of the tripping member and forms a limit match with a contact mechanism of the circuit breaker, and the limit plate and the contact mechanism trigger the contact mechanism to perform a switch-off tripping action when the limit match is released; and further comprising:

[0007] The refastening structure comprises a refastening member movably arranged on the housing and a first spring connected to the refastening member, wherein the first spring drives the refastening member to move toward a side close to the jump fastening member, so that the refastening member and the jump fastening member are matched and abutted against each other; the jump fastening member has a locking state in which it abuts against the refastening member to form a positioning match, and a disengaging state in which it is separated from the refastening member and rotates, and the jump fastening member drives the limit plate and the contact mechanism to release the limit match in the disengaging state;

[0008] The temperature sensing element structure is connected to the main circuit of the circuit breaker and has a driving part extending on the movement path of the re-fastener. The first spring provides elastic force to make the re-fastener press against the driving part and the jumper respectively. When the temperature sensing element structure is bent by heat, the driving part pushes the re-fastener to move away from the jumper, so that the jumper is separated from the re-fastener and switches from a locked state to a tripped state.

[0009] In the above-mentioned oil-immersed circuit breaker with an adjustable overcurrent protection structure, a first locking structure is arranged between the re-fastener and the jumper to keep the two positioned and matched. The first locking structure includes a first lock hook arranged on the jumper, and a first clamping platform arranged at the bottom of the re-fastener and matched with the first lock hook. When the first lock hook and the first clamping platform are hooked together, the jumper is restricted from rotating.

[0010] In the above-mentioned oil-immersed circuit breaker with an adjustable overcurrent protection structure, the re-fastener is rotatably arranged on the shell, or the re-fastener is movably arranged on the shell; the driving part and the jump fastener are respectively located below the re-fastener, so that the driving part and the bottom of the re-fastener are arranged opposite to or against each other, and the first spring is arranged between the top of the re-fastener and the shell.

[0011] In the above-mentioned oil-immersed circuit breaker with an adjustable overcurrent protection structure, one end of the re-fastener is provided with a rotating shaft portion rotatably connected to the shell, and the bottom of the other end is provided with a contact groove cooperating with the driving portion and a first clamping platform cooperating with the jump fastener, and the top of the other end of the re-fastener is provided with a positioning block for positioning and connecting to the first spring.

[0012] In the above-mentioned oil-immersed circuit breaker with an adjustable overcurrent protection structure, the jumper is rotated and located on one side of the temperature sensing element structure, and a second spring is provided between the jumper and the shell. The jumper includes an arc convex edge and a first lock hook formed at one end of the arc convex edge, and a driving boss arranged on the side of the jumper for driving the limit plate to move. The second spring drives the jumper to rotate relative to the re-fastener in the tripped state.

[0013] In the above-mentioned oil-immersed circuit breaker with an adjustable overcurrent protection structure, the temperature sensing element structure includes a bimetallic strip electrically connected to the main circuit of the circuit breaker, and the driving part includes a driving rod extending along the length direction of the bimetallic strip and fixed to one end of the bimetallic strip, and the driving rod has an L-shaped protrusion that cooperates with the contact groove at the bottom of the fastener, and the end of the L-shaped protrusion is provided with an arc structure.

[0014] The above-mentioned oil-immersed circuit breaker with an adjustable overcurrent protection structure also includes a tripping alarm mechanism that cooperates with the re-fastener, and the tripping alarm mechanism includes an alarm tripping member rotatably arranged on the movement path of the re-fastener, and an alarm switch or an alarm indicator light driven by the alarm tripping member to realize opening and closing operations; a second locking structure that forms a positioning fit is provided between the alarm tripping member and the re-fastener, and when the re-fastener moves under the drive of the temperature sensing element structure, it is first separated from the alarm tripping member and then separated from the tripping member.

[0015] In the above-mentioned oil-immersed circuit breaker with an adjustable overcurrent protection structure, the second locking structure includes a second clamping plate arranged at the bottom of the re-clamp, and a second locking hook arranged on the alarm release member and cooperating with the second clamping plate. When the second locking hook cooperates with the second clamping plate, the rotation of the alarm release member is restricted. The second clamping plate and the first clamping plate are relatively arranged at the bottom of the re-clamp, and a contact groove is formed between the second clamping plate and the first clamping plate.

[0016] In the above-mentioned oil-immersed circuit breaker with adjustable overcurrent protection structure, the tripping member and the alarm release member are coaxially rotatably arranged on the shell, and are relatively arranged on both sides of the temperature sensing element structure; the fastening surface distance L1 between the tripping member and the refastening member is greater than the fastening surface distance L2 between the alarm release member and the refastening member.

[0017] In the above-mentioned oil-immersed circuit breaker with an adjustable overcurrent protection structure, the contact mechanism includes a moving bracket rotatably arranged on the shell and a moving contact arranged on the moving bracket, and an operating component that drives the moving bracket to rotate for opening and closing. The moving contact is electrically connected to the temperature sensing element structure through a flexible connection. An opening spring is arranged between the moving bracket and the shell. A limiting slot is provided on the side of the limiting plate facing the moving bracket, and the upper end of the moving bracket away from the moving contact is connected to the limiting slot to form a limiting fit.

[0018] In the above-mentioned oil-immersed circuit breaker with an adjustable overcurrent protection structure, the operating component includes a handle slider slidably arranged on the shell, and the movement trajectories of the tripping member and the alarm tripping member intersect with the movement trajectory of the handle slider respectively.

[0019] In the above oil-immersed circuit breaker with adjustable overcurrent protection structure, the temperature sensing element structure can be swung and adjusted relative to the refastener by an adjusting component, and the adjusting component includes:

[0020] The adjusting bracket is rotatably arranged in the housing, one end of the bimetallic strip is a connecting end fixedly connected to the adjusting bracket, and the other end is a driving end bent toward the fastener side by heat, and the driving rod is fixed on the driving end;

[0021] An adjusting nut is rotatably arranged on the top of the housing, and an adjusting rod is threadedly connected to the lower end of the adjusting nut. The adjusting rod extends along the axial direction of the adjusting nut and is connected to the adjusting bracket. The adjusting bracket is movably connected to the adjusting rod through a connecting arm. When the adjusting nut rotates, the adjusting rod is driven to reciprocate along the axial direction, so that the adjusting bracket is driven to rotate by the adjusting rod;

[0022] The adjusting return spring is arranged between the adjusting bracket and the inner top surface of the shell.

[0023] Compared with the prior art, the technical solution of the present invention has the following advantages:

[0024] 1. In the oil-immersed circuit breaker provided by the present invention, a refastener is extended and connected according to the driving part of the temperature sensing element structure. The refastener will be pressed and contacted on the driving part and the jumper under the elastic force of the first spring, so that the refastener and the jumper are pressed against each other to form a positioning match, thereby positioning the jumper in a locked state. Therefore, when an overload fault occurs in the main circuit, the temperature sensing element structure is bent due to heat, which pushes the refastener to move away from the jumper, so that the refastener is separated from the jumper and the positioning match is released. At this time, the jumper drives the limit plate and the contact mechanism to release the limit match during the process of switching from the locked state to the tripped state, thereby triggering the contact mechanism to perform a tripping and opening action, and finally realizing The overload tripping of the existing circuit breaker is released; the adjustable tripping mechanism of the circuit breaker adopts the technical solution, which avoids the direct buckle between the temperature sensing element structure and the tripping element by arranging a re-buckle structure between the temperature sensing element structure and the tripping element, and utilizes the re-buckle structure to replace the temperature sensing element structure to play the role of positioning, maintaining and tripping release for the tripping element, thereby overcoming the problem of easy slippage between the existing temperature sensing element structure and the tripping element, and by reasonably adjusting the contact distance between the temperature sensing element structure and the re-buckle, the re-buckle is kept in close positioning contact with the tripping element with the help of spring force, has a good positioning and anti-loosening effect, and has good matching stability, thereby ensuring the overload protection function of the circuit breaker and improving the safety of product use.

[0025] 2. In the oil-immersed circuit breaker provided by the present invention, according to the first spring being arranged on the top of the re-fastener, and the temperature sensing element structure being in contact with the bottom of the re-fastener through the driving part, the first spring applies a force to the re-fastener to rotate toward the side close to the tripping element, and the temperature sensing element structure applies a driving force to the re-fastener to rotate toward the side away from the tripping element when it is bent by heat. It can be seen that the movement trends of the re-fastener subjected to the two forces are opposite. The elastically arranged re-fastener can form both a transmission fit with the temperature sensing element structure and a positioning fit with the tripping element. When the temperature sensing element structure drives the re-fastener to rotate away from the tripping element, the positioning fit between the re-fastener and the tripping element is released, thereby triggering the tripping rotation of the tripping element, and finally realizing the tripping and opening action of the circuit breaker.

[0026] 3. In the oil-immersed circuit breaker provided by the present invention, according to the positioning cooperation between the re-fastener and the jump fastener through the first locking structure, and the positioning cooperation between the re-fastener and the alarm release through the second locking structure, when the re-fastener moves toward the side away from the jump fastener under the drive of the temperature sensing element structure, by reasonably designing the buckling distance between the re-fastener, the jump fastener and the alarm release, the re-fastener is first separated from the alarm release part and then separated from the jump fastener. The function of overload pre-alarm can be achieved. In this way, when the circuit breaker is overloaded, an alarm is issued instead of automatically disconnecting the circuit. It is possible to manually judge and choose whether to cut off the circuit, or enable the user to eliminate the circuit fault as soon as possible, thereby avoiding significant losses caused by sudden circuit disconnection. In this way, the function of overload alarm but not disconnecting the circuit can be achieved.

[0027] 4. In the oil-immersed circuit breaker provided by the present invention, the engagement surface distance L1 between the jump fastener and the re-fastener is greater than the engagement surface distance L2 between the alarm tripping member and the re-fastener. The advantage of such a design is that, the smaller the engagement surface distance, the shorter the triggering tripping time. In the process that the re-fastener is pushed by the temperature sensing element structure to move away from the jump fastener, the re-fastener will first separate and trip from the alarm tripping member. At this time, the alarm tripping member will rotate to trigger an overload alarm to remind the user to deal with the circuit fault in time. Then, as the temperature sensing element structure is heated and bent more, the re-fastener and the jump fastener are finally driven to achieve tripping and separation, thereby realizing the overload tripping and opening of the circuit breaker.

[0028] 5. In the oil-immersed circuit breaker provided by the present invention, a second spring is provided between the jumper and the shell. The function of the second spring is to drive the jumper to rotate quickly when the tripping member is separated from the re-fastening member, thereby realizing the process of switching the jumper from a locked state to a tripped state, so that the jumper pushes the limit plate to be lifted through the driving boss during the rotation process, thereby releasing the limit cooperation between the limit plate and the contact mechanism, thereby triggering the tripping and opening action of the contact mechanism, with high action sensitivity, and playing an overload protection function.

[0029] 6. In the oil-immersed circuit breaker provided by the present invention, the adjusting nut is rotated to drive the adjusting rod to move up and down, and the adjusting rod drives the adjusting bracket to rotate a certain angle, thereby realizing the angle adjustment of the temperature sensing element structure. The refastener is pressed and contacted on the temperature sensing element structure under the action of spring force, so that the refastener can realize position adjustment according to the angle adjustment of the temperature sensing element structure. The advantage of such a design is that by adjusting the swing angle of the temperature sensing element structure, the engagement distance between the refastener and the jump fastener and the alarm release member can be adjusted, thereby realizing the adjustment of the circuit breaker overload alarm and overload tripping time, which is beneficial to improving the current limiting capacity of the circuit breaker for overload faults. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0031] Figure 1 A schematic diagram of the structure of an oil-immersed circuit breaker with an adjustable overcurrent protection structure provided by the present invention;

[0032] Figure 2 for Figure 1 The schematic diagram of the structure of the circuit breaker with the adjustable tripping mechanism hiding the tripping member is shown;

[0033] Figure 3 It is a schematic diagram of the installation structure of the jump fastener and the refastener on the housing of the present invention;

[0034] Figure 4 It is a structural schematic diagram of the refastening member, the jump fastening member and the alarm tripping member of the present invention;

[0035] Figure 5 It is a structural schematic diagram of the refastening member, the jump fastening member and the alarm tripping member in another direction of the present invention;

[0036] Figure 6 It is a schematic structural diagram of the refastener of the present invention.

[0037] Explanation of the reference numerals in the accompanying drawings: 1. limit plate; 11. limit slot; 2. jump fastener; 20. arc convex edge; 21. first lock hook; 22. second spring; 23. drive boss; 3. re-fastener; 31. first clamping platform; 32. second clamping platform; 33. contact groove; 34. positioning block; 35. shaft portion; 4. first spring; 5. temperature sensing element structure; 51. bimetallic strip; 52. drive portion; 53. L-shaped protrusion; 6. alarm release member; 61. second lock hook; 7. contact mechanism; 71. moving bracket; 72. moving contact; 73. static contact; 74. opening spring; 75. handle slider; 8. adjustment assembly; 81. adjustment bracket; 82. adjustment nut; 83. adjustment rod; 84. adjustment reset spring; 9. housing. DETAILED DESCRIPTION

[0038] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] In the description of the present invention, it should be noted that the terms “first”, “second” and “third” are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0040] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0041] Example

[0042] This embodiment provides Figure 1-Figure 6 An oil-immersed circuit breaker with an adjustable overcurrent protection structure is shown, comprising a limit plate 1 and a tripping member 2 rotatably arranged on a housing 9, wherein the limit plate 1 is extended on the movement path of the tripping member 2 and forms a limit fit with a contact mechanism 7 of the circuit breaker, and the contact mechanism 7 performs a switch-off tripping action when the limit fit with the limit plate 1 is released; and further comprising:

[0043] The refastening structure comprises a refastening member 3 movably arranged on a housing 9 and a first spring 4 connected to the refastening member 3, wherein the first spring 4 drives the refastening member 3 to move toward a side close to the jump fastening member 2, so that the refastening member 3 and the jump fastening member 2 cooperate and abut against each other; the jump fastening member 2 has a locking state in which it abuts against the refastening member 3 to form a positioning fit, and a disengaging state in which it is separated from the refastening member 3 and rotates, and the jump fastening member 2 drives the limit plate 1 and the contact mechanism 7 to release the limit fit in the disengaging state;

[0044] The temperature sensing element structure 5 is connected to the main circuit of the circuit breaker and has a driving part 52 extending on the movement path of the re-fastener 3. The temperature sensing element structure 5 can be swung to adjust the position relative to the re-fastener 3 through the adjusting component 8. The first spring 4 provides elastic force to make the re-fastener 3 press against the driving part 52 and the jumper 2 respectively. According to the characteristic of the temperature sensing element structure 5 being bendable when heated, the temperature sensing element structure 5 pushes the re-fastener 3 to move away from the jumper 2 through the driving part 52 when bent by heat, so that the jumper 2 is switched from the locked state to the tripped state after separation from the re-fastener 3.

[0045] In the above embodiment, according to the driving part of the temperature sensing element structure 5, the re-fastener 3 is extended and connected to the re-fastener 3, and the re-fastener will be pressed and contacted on the driving part 52 and the jumper 2 respectively under the elastic force of the first spring 4, so that the re-fastener 3 and the jumper 2 are pressed against each other to form a positioning match, thereby positioning the jumper 2 in a locked state. Therefore, when an overload fault occurs in the main circuit, the temperature sensing element structure 5 is bent by heat, which pushes the re-fastener 3 to move away from the jumper 2, so that the re-fastener 3 is separated from the jumper 2 and the positioning match is released. At this time, the jumper 2 drives the limit plate 1 to release the limit match with the contact mechanism during the process of switching from the locked state to the tripped state, thereby triggering the contact mechanism 7 to perform the tripping and opening action, and finally The overload tripping of the circuit breaker is realized; the adjustable tripping mechanism of the circuit breaker adopting the technical solution avoids the direct buckle between the temperature sensing element structure 5 and the tripping fastener 2 by arranging a re-buckle structure between the temperature sensing element structure 5 and the tripping fastener 2, and utilizes the re-buckle structure to replace the temperature sensing element structure 5 to play the role of positioning, maintaining and tripping release of the tripping fastener 2, thereby overcoming the problem of easy slippage between the existing temperature sensing element structure 5 and the tripping fastener 2, and through reasonably adjusting the contact distance between the temperature sensing element structure 5 and the re-buckle 3, the re-buckle is kept in close positioning contact with the tripping fastener with the help of spring force, has a good positioning and anti-loosening effect, and has good matching stability, thereby ensuring the overload protection function of the circuit breaker and improving the safety of product use.

[0046] Combine the following Figure 1-Figure 4 The specific setting methods of refasteners and jump fasteners are explained in detail:

[0047] A first locking structure is provided between the refastener 3 and the jump fastener 2 to keep the two in position and fit. The first locking structure includes a first locking hook 21 provided on the jump fastener 2, and a first clamping platform 31 provided at the bottom of the refastener 3 and cooperating with the first locking hook. According to this structural arrangement, the first locking hook 21 and the first clamping platform 31 are engaged and hooked to limit the rotation of the jump fastener 2. Only when the temperature sensing element structure 5 drives the refastener 3 to move toward the side of the jump fastener, the refastener 3 drives the first clamping platform 31 to disengage from the first locking hook 21, thereby releasing the limit locking of the jump fastener 2 by the refastener 3.

[0048] It is further preferably arranged that the refastener 3 is rotatably arranged on the shell 9, the driving part 52 and the jump fastener 2 are respectively located below the refastener 3, and by adjusting the swing angle of the temperature sensing element structure 5, the driving part 52 can be made to be opposite to the bottom of the refastener 3, or the driving part 52 can be made to abut against the bottom of the refastener 3, and the first spring 4 is arranged between the top of the refastener 3 and the shell 9, wherein one end of the refastener 3 is provided with a rotating shaft part 35 rotatably connected to the shell 9, and the bottom of the other end is provided with a contact groove 33 cooperating with the driving part 52 and a first clamping table 31 cooperating with the jump fastener 2, and the top of the other end of the refastener 3 is provided with a positioning block 34 for positioning and connecting the first spring 4, so that one end of the first spring 4 abuts against the refastener The top of the fastener 3, and its other end abuts against the inner top surface of the shell 9. With this structural arrangement, the first spring 4 applies a force to the re-fastener 3 to rotate toward the side close to the jump fastener 2, and the temperature sensing element structure 5 applies a driving force to the re-fastener 3 to rotate away from the jump fastener 2 when it is bent by heat. It can be seen that the movement trends of the re-fastener 3 subjected to the two forces are opposite. The elastically arranged re-fastener can form a transmission fit with the temperature sensing element structure and a positioning fit with the release element. When the re-fastener 3 is driven by the temperature sensing element structure 5 to rotate away from the jump fastener 2, the positioning fit between the re-fastener 3 and the jump fastener 2 can be released, thereby triggering the tripping rotation of the jump fastener 2, and finally realizing the tripping and opening action of the circuit breaker.

[0049] As an alternative, the refastener 3 is movably arranged on the housing 9, and a guide slot is arranged in the housing 9 in the manner of the jumper 2, and the refastener 3 and the first spring 4 are arranged in the guide slot, so that the refastener 3 is moved out of the guide slot to cooperate with the jumper 2 and the temperature sensing element structure 5. Those skilled in the art can select the specific arrangement of the refastener 3 according to the above description, and will not be described one by one here.

[0050] like Figure 1As shown, the jumper 2 is rotated to one side of the driving part 52 to avoid position interference between the two. A second spring 22 is provided between the jumper 2 and the housing 9. The jumper 2 includes an arc convex edge 20 and a first lock hook 21 formed at one end of the arc convex edge 20, and a driving boss 23 provided on the side of the jumper 2 for driving the limit plate 1 to move. The second spring 22 drives the jumper 2 in the tripped state to rotate relative to the re-fastener 3, so that the first clamping platform 31 and the first lock hook 21 will slide and contact the jumper 2 after being tripped and separated. On the arc convex edge 20, one end of the second spring is connected to the driving boss, and the other end is connected to the side wall of the shell. With this structural arrangement, the function of the second spring 22 is to drive the jumper 2 to rotate quickly when the tripping member is separated from the re-fastening member 3, thereby realizing the process of switching the jumper 2 from a locked state to a tripped state, so that the jumper pushes the limit plate 1 to be lifted through the driving boss 23 during the rotation process, thereby releasing the limit cooperation between the limit plate 1 and the contact mechanism 7, thereby triggering the tripping and opening action of the contact mechanism, with high action sensitivity and overload protection function.

[0051] As a preferred embodiment, the temperature sensing element structure 5 includes a temperature sensing element connected to the main circuit of the circuit breaker, and the temperature sensing element is preferably a bimetallic strip. The driving part 52 includes a driving rod extending along the length direction of the bimetallic strip and fixed at one end of the bimetallic strip 51, and the driving rod has an L-shaped protrusion 53 that cooperates with the contact groove 33 at the bottom of the refastener 3. By connecting the driving rod with the bimetallic strip to increase the overall length, the connection distance requirement between the bimetallic strip 51 and the refastener 3 can be met. When the bimetallic strip is overloaded and heated, it bends toward the refastener side, thereby driving the driving rod to push the refastener 3 to rotate away from the jump fastener 2, and at the same time squeezes the first spring 4. The end of the L-shaped protrusion 53 is set to an arc structure that contacts the bottom surface of the refastener, which can reduce the friction between the driving rod and the refastener when the temperature sensing element structure is heated and bent, ensuring that the product tripping force is less than the driving force requirement of the temperature sensing element structure, and improving the reliability of overload protection. In addition, after the sensing element structure cools and recovers its deformation, the refastener 3 rotates toward the side close to the jumper 2 under the action of the first spring 4, while maintaining contact with the driving rod, thereby preparing for the positioning and cooperation between the refastener 3 and the jumper 2.

[0052] The oil-immersed circuit breaker provided in this embodiment also includes a trip alarm mechanism that cooperates with the refastener 3. Figure 2-Figure 5As shown, the tripping alarm mechanism includes an alarm tripping member 6 rotatably arranged on the movement path of the refastener 3, and an alarm switch or alarm indicator light driven by the alarm tripping member 6 to be opened and closed, for example, the alarm switch is driven by the alarm tripping member 6 to operate a switch button, or the alarm circuit of the alarm indicator light is connected by the alarm tripping member 6, wherein a second locking structure for forming a positioning fit is provided between the alarm tripping member 6 and the refastener 3, and this structural arrangement forms a positioning fit with the jump fastener 2 through the first locking structure of the refastener 3, and the refastener 3 forms a positioning fit with the alarm tripping member through the second locking structure. When the refastener 3 moves toward the side away from the trip fastener 2 under the drive of the temperature sensing element structure 5, by reasonably designing the buckling distance between the refastener 3, the trip fastener 2 and the alarm tripping member 6, the refastener 3 is first separated from the alarm tripping member 6 and then separated from the trip fastener 2. The front-to-back action relationship can be achieved, and the overload pre-alarm function can be achieved. In this way, when the circuit breaker is overloaded, an alarm can be issued instead of automatically disconnecting the circuit, and the user can manually judge and choose whether to cut off the circuit, or eliminate the circuit fault as soon as possible, thereby avoiding significant losses caused by sudden circuit disconnection. In this way, the function of overload alarm but not disconnecting the circuit can be achieved.

[0053] As a preferred embodiment, the second locking structure includes a second card platform 32 arranged at the bottom of the refastener 3, and a second lock hook 61 arranged on the alarm release member and cooperating with the second card platform 32. The second lock hook 61 limits the rotation of the alarm release member 6 when it cooperates with the second card platform 32. The alarm release member 6 is connected with a spring member, and the spring member can be used to enable the alarm release member 6 to rotate after being separated from the refastener 3. The second card platform 32 and the first card platform 31 are relatively arranged at the bottom of the refastener 3, and the contact groove 33 is formed between the second card platform 32 and the first card platform 31. This design makes the second card platform 32 and the first card platform 31 avoid each other with the driving rod, while satisfying the cooperation between the driving rod and the refastener 3, wherein the jump fastener 2 and the alarm release member 6 are coaxially rotatably arranged on the The shell 9 is relatively arranged on both sides of the temperature sensing element structure 5, so as to avoid position interference between the temperature sensing element structure 5 and the jump fastener 2 and the re-fastener 3. The fastening surface distance L1 between the jump fastener 2 and the re-fastener 3 is greater than the fastening surface distance L2 between the alarm tripping member 6 and the re-fastener 3. The advantage of this design is that, according to the smaller the fastening surface distance, the shorter the triggering tripping time is. In the process that the re-fastener 3 is pushed by the temperature sensing element structure 5 to move toward the side away from the jump fastener 2, the re-fastener 3 will be separated and tripped from the alarm tripping member 6 first. At this time, the alarm tripping member 6 will rotate to trigger the overload alarm of the alarm switch or the alarm indicator light, so as to remind the user to deal with the circuit fault in time. As the temperature sensing element structure 5 is heated and bent more, it will eventually drive the re-fastener 3 and the jump fastener 2 to achieve tripping separation, thereby realizing the overload tripping and opening of the circuit breaker.

[0054] In this embodiment, combined with Figure 1-Figure 2 As shown, the contact mechanism 7 includes a moving bracket 71 rotatably arranged on the housing 9 and a moving contact 72 arranged on the moving bracket 71, and an operating component that drives the moving bracket 71 to rotate for opening and closing. The moving contact 72 is electrically connected to the temperature sensing element structure 5 through a flexible connection. A stationary contact 73 opposite to the moving contact 72 is arranged in the housing 9. A closing spring 74 is arranged between the moving bracket 71 and the housing 9. The limiting plate 1 is provided with a limiting card slot 11 on the side facing the moving bracket 71. The moving bracket The upper end of 71 away from the moving contact 72 is connected to the limit slot 11 to form a limit fit. When the contact mechanism 7 drives the moving contact 72 to contact the static contact 73 in a closed state, the opening spring 74 is stretched and stores energy. Therefore, when the limit plate 1 is driven by the tripping latch 2, it swings toward the side away from the moving bracket 71, thereby separating the limit plate 1 from the moving bracket 71. At this time, the contact mechanism 7 performs a tripping and opening action under the action of the spring force released by the opening spring 74, thereby realizing the separation of the moving and static contacts.

[0055] like Figure 2 As shown, the operating component includes a handle slider 75 slidably set on the shell 9, and the movement trajectories of the tripping member 2 and the alarm tripping member 6 intersect with the movement trajectory of the handle slider 75. Specifically, the shell 9 is provided with a handle groove for the handle slider 75 to move. The tripping member 2 and the alarm tripping member 6 rotate to one end of the handle groove after being separated from the re-fastening member 3. Therefore, when the circuit breaker is reclosed, the handle slider 75 moves along the handle groove and pushes the tripping member 2 and the alarm tripping member 6 to reset and rotate, so that the tripping member 2 and the alarm tripping member are respectively re-positioned and matched with the re-fastening member 3.

[0056] According to the temperature sensing element structure 5, the temperature sensing element 51 is swingably arranged in the housing through the adjustment component 8. In order to accurately adjust the swing angle of the temperature sensing element 51, refer to Figure 1-Figure 3The adjusting assembly 8 comprises an adjusting bracket 81, an adjusting nut 82, an adjusting rod 83 and an adjusting reset spring 84; wherein, the adjusting bracket 81 is rotatably arranged in the shell 9, one end of the temperature sensing element sheet 51 is a connecting end fixedly connected to the adjusting bracket 81, and the other end thereof is a driving end that is bent toward the side of the fastener 3 when heated, and the driving rod is fixed on the driving end; the adjusting nut 82 is rotatably arranged on the top of the shell 9, and the lower end of the adjusting nut 82 is threadedly connected with an adjusting rod 83, and the adjusting rod 83 is connected to the adjusting bracket 81 along the axial direction of the adjusting nut 82, and the adjusting bracket 81 is movably connected to the adjusting rod 83 through a connecting arm, and the adjusting reset spring 84 is arranged between the adjusting bracket 81 and the inner top surface of the shell 9, When the adjusting nut 82 rotates, the adjusting rod 83 is driven to reciprocate along the axial direction, so that the adjusting rod 83 drives the adjusting bracket 81 to rotate a certain angle, thereby realizing the angle adjustment of the temperature sensing element structure 5. According to the fastener 3, the driving rod of the temperature sensing element structure 5 is pressed and contacted under the action of the spring force, so that the fastener 3 can realize position adjustment according to the angle adjustment of the temperature sensing element structure 5. The advantage of such a design is that by adjusting the swing angle of the temperature sensing element structure, the engagement distance between the fastener 3 and the jump fastener 2 and the alarm release member 6 can be adjusted, thereby realizing the adjustment of the overload alarm and overload tripping time. In this way, the overload tripping reaction speed of the circuit breaker can be adjusted according to the use requirements, which is beneficial to improving the current limiting capacity of the circuit breaker for overload faults.

[0057] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. An oil-immersed circuit breaker with an adjustable overcurrent protection structure, comprising a limit plate (1) and a tripping member (2) rotatably arranged on a housing (9), wherein the limit plate (1) is extended on the movement path of the tripping member (2) and forms a limit fit with a contact mechanism (7) of the circuit breaker, and the contact mechanism (7) performs a switch-off tripping action when the limit fit with the limit plate (1) is released; characterized in that: Also includes: The re-fastening structure comprises a re-fastening member (3) movably arranged on a housing (9) and a first spring (4) connected to the re-fastening member (3), wherein the first spring (4) drives the re-fastening member (3) to move toward a side close to a jump fastening member (2), so that the re-fastening member (3) and the jump fastening member (2) cooperate and abut against each other; the jump fastening member (2) has a locking state in which it abuts against the re-fastening member (3) to form a positioning fit, and a disengaging state in which it separates from the re-fastening member (3) and rotates; in the disengaging state, the jump fastening member (2) drives the limit plate (1) and the contact mechanism (7) to release the limit fit; The temperature sensing element structure (5) is connected to the main circuit of the circuit breaker and has a driving part (52) extending on the movement path of the refastener (3). The first spring (4) provides elastic force to make the refastener (3) press against the driving part (52) and the tripping part (2) respectively. When the temperature sensing element structure (5) is bent by heat, the driving part (52) pushes the refastener (3) to move away from the tripping part (2), so that the tripping part (2) is separated from the refastener (3) and switches from the locked state to the released state.

2. The oil-immersed circuit breaker with an adjustable overcurrent protection structure according to claim 1, characterized in that: A first locking structure is provided between the refastener (3) and the jump fastener (2) to keep the two in a positioned fit. The first locking structure comprises a first locking hook (21) provided on the jump fastener (2), and a first clamping platform (31) provided at the bottom of the refastener (3) and cooperating with the first locking hook. When the first locking hook (21) and the first clamping platform (31) are engaged and hooked, the jump fastener (2) is restricted from rotating.

3. The oil-immersed circuit breaker with an adjustable overcurrent protection structure according to claim 1, characterized in that: The refastener (3) is rotatably arranged on the shell (9), or the refastener (3) is movably arranged on the shell (9); the driving part (52) and the jump fastener (2) are respectively located below the refastener (3), so that the driving part (52) and the bottom of the refastener (3) are arranged opposite to or against each other, and the first spring (4) is arranged between the top of the refastener (3) and the shell (9).

4. The oil-immersed circuit breaker with an adjustable overcurrent protection structure according to claim 3, characterized in that: One end of the refastener (3) is provided with a rotating shaft portion (35) rotatably connected to the shell (9), and the bottom of the other end is provided with a contact groove (33) cooperating with the driving portion (52) and a first clamping table (31) cooperating with the jump fastener (2), and the top of the other end of the refastener (3) is provided with a positioning block (34) for positioning and connecting to the first spring (4).

5. The oil-immersed circuit breaker with an adjustable overcurrent protection structure according to claim 2, characterized in that: A second spring (22) is provided between the jumper (2) and the housing (9); the jumper (2) comprises a circular arc convex edge (20) and a first locking hook (21) formed at one end of the circular arc convex edge (20), and a driving boss (23) provided on the side of the jumper (2) for driving the limit plate (1) to move; the second spring (22) drives the jumper (2) in a released state to rotate relative to the re-fastening element (3).

6. The oil-immersed circuit breaker with an adjustable overcurrent protection structure according to any one of claims 1 to 5, characterized in that: The temperature sensing element structure (5) comprises a bimetallic strip (51) connected to the main circuit of the circuit breaker, and the driving part (52) comprises a driving rod extending along the length direction of the bimetallic strip and fixed to one end of the bimetallic strip (51), the driving rod having an L-shaped protrusion (53) that contacts in a contact groove (33) at the bottom of the refastener (3), and an arc structure is provided at the end of the L-shaped protrusion (53).

7. The oil-immersed circuit breaker with an adjustable overcurrent protection structure according to any one of claims 1 to 5, characterized in that: It also includes a tripping alarm mechanism that cooperates with the refastening member (3), and the tripping alarm mechanism includes an alarm tripping member (6) that is rotatably arranged on the movement path of the refastening member (3), and an alarm switch or an alarm indicator light that is driven by the alarm tripping member (6) to realize opening and closing operations; a second locking structure that forms a positioning cooperation is provided between the alarm tripping member (6) and the refastening member (3), and when the refastening member (3) moves under the drive of the temperature sensing element structure (5), it is first separated from the alarm tripping member (6) and then separated from the tripping member (2).

8. The oil-immersed circuit breaker with an adjustable overcurrent protection structure according to claim 7, characterized in that: The second locking structure comprises a second clamping platform (32) arranged at the bottom of the re-clamping member (3), and a second locking hook (61) arranged on the alarm release member (6) and cooperating with the second clamping platform (32); the second locking hook (61) restricts the rotation of the alarm release member (6) when cooperating with the second clamping platform (32); the second clamping platform (32) and the first clamping platform (31) are arranged relative to each other at the bottom of the re-clamping member (3); and a contact groove (33) is formed between the second clamping platform (32) and the first clamping platform (31).

9. The oil-immersed circuit breaker with an adjustable overcurrent protection structure according to claim 8, characterized in that: The jumper (2) and the alarm release member (6) are coaxially rotatably arranged on the housing (9) and are relatively arranged on both sides of the temperature sensing element structure (5); the locking surface distance L1 between the jumper (2) and the locking member (3) is greater than the locking surface distance L2 between the alarm release member (6) and the locking member (3).

10. The oil-immersed circuit breaker with an adjustable overcurrent protection structure according to claim 7, characterized in that: The contact mechanism (7) comprises a movable bracket (71) rotatably arranged on a housing (9), a movable contact (72) arranged on the movable bracket (71), and an operating component for driving the movable bracket (71) to perform opening and closing movements; the movable contact (72) is electrically connected to a temperature sensing element structure (5) via a flexible connection; an opening spring (74) is arranged between the movable bracket (71) and the housing (9); a limiting groove (11) is provided on the side of the limiting plate (1) facing the movable bracket (71); and the upper end of the movable bracket (71) away from the movable contact (72) is connected to the limiting groove (11) to form a limiting fit.

11. The oil-immersed circuit breaker with an adjustable overcurrent protection structure according to claim 10, characterized in that: The operating assembly comprises a handle slider (75) slidably arranged on the housing (9), and the movement trajectories of the tripping member (2) and the alarm tripping member (6) respectively intersect with the movement trajectory of the handle slider (75).

12. The oil-immersed circuit breaker with an adjustable overcurrent protection structure according to claim 6, characterized in that: The temperature sensing element structure (5) can be swung to adjust the position relative to the refastener (3) through an adjusting component (8), and the adjusting component (8) comprises: The adjusting bracket (81) is rotatably arranged in the housing (9), one end of the bimetallic strip (51) is a connecting end fixedly connected to the adjusting bracket (81), and the other end is a driving end that is bent toward one side of the refastener (3) when heated, and the driving rod is fixed on the driving end; An adjusting nut (82) is rotatably arranged on the top of the shell (9); the lower end of the adjusting nut (82) is threadedly connected with an adjusting rod (83); the adjusting rod (83) extends along the axial direction of the adjusting nut (82) and is connected to the adjusting bracket (81); the adjusting bracket (81) is movably connected to the adjusting rod (83) via a connecting arm; when the adjusting nut (82) rotates, the adjusting rod (83) is driven to reciprocate along the axial direction, thereby the adjusting rod (83) drives the adjusting bracket (81) to rotate.

Images