A sealed operating structure for oil-immersed circuit breaker

Abstract

The invention discloses a sealing operation structure of an oil-immersed circuit breaker, comprising a mounting seat mounted on a barrel wall of an oil tank, an operating rod and an adjusting rod rotatably penetrated on the mounting seat, and a sealing locking piece threadedly connected to a connecting protrusion of the mounting seat, wherein the mounting seat is locked on the barrel wall of the oil tank by the sealing locking piece, and a sealing filler is provided between the mounting seat and the barrel wall of the oil tank so that the sealing filler is squeezed and filled between the mounting seat and the barrel wall of the oil tank and seals and holds the connecting protrusion tightly, thereby achieving an internal and external double sealing installation effect between the mounting seat and the barrel wall of the oil tank, and the operating rod and the adjusting rod are respectively provided with a sealing effect of multiple sealing protection and a multi-section structure and sealing and decompressing in sections by a first sealing component and a second sealing component, thereby avoiding accidents such as electrical safety and fire safety caused by oil leakage, and reducing operation and maintenance costs at the same time, achieving a good sealing effect, ensuring the safe operation of the circuit breaker and the transformer, and prolonging the service life of the product.

Description

Technical Field

[0001] The invention relates to the technical field of low-voltage electrical appliances, and in particular to a sealed operating mechanism of an oil-immersed circuit breaker. Background Art

[0002] As the living standards of residents continue to improve, more and more household appliances are used, and the power load is increasing sharply. Especially during peak hours of electricity consumption, transformers often operate under overload and overheat. In the worst case, the service life of the transformer is shortened, and in the worst case, the transformer is burned and causes significant losses. This requires that when the transformer is overloaded or overheated during operation, an alarm prompt device should be set to cut off the power supply circuit to avoid power accidents. Therefore, oil-immersed circuit breakers used in conjunction with transformers are needed in power systems. Oil-immersed circuit breakers are a type of power switching device that uses high-insulation oil as a medium. They are used for the protection and control of power transmission and distribution networks. They can cut off and isolate fault currents in the circuit to protect power equipment and personal safety. This oil-immersed circuit breaker is installed in the transformer oil tank and has an operating assembly installed on the transformer barrel wall. The operating assembly can be used to operate the circuit breaker's opening and closing and adjust the circuit breaker's overload tripping time. The operating assembly includes a mounting base and an operating rod and an adjusting rod set on the mounting base. First, the operating rod and the adjusting rod in the operating assembly are prone to seal failure during frequent operation and use, and the sealing performance is poor; secondly, the oil tank is affected by temperature and oil pressure changes, which will cause slight deformation of the barrel wall. Under uneven force, it will cause a seal leakage accident between the operating assembly and the barrel wall, resulting in poor installation sealing and affecting the product's service life. The oil-immersed circuit breaker has extremely high requirements for installation sealing, so it is required to optimize the design of the sealing structure of the operating assembly to meet the sealing requirements. Summary of the invention

[0003] Therefore, the technical problem to be solved by the present invention is to overcome the problems in the prior art of sealing leakage accidents between the operating assembly and the oil tank wall due to slight deformation of the oil tank, poor installation sealing, and shortening of the product service life.

[0004] In order to solve the above technical problems, the present invention provides an oil-immersed circuit breaker sealing operation structure, which is installed on the wall of the transformer oil tank and is used to connect the circuit breaker body in the oil tank, comprising:

[0005] A mechanism bracket, fixedly connected to the circuit breaker body and arranged opposite to the oil tank wall;

[0006] A mounting seat, fixed on the mechanism bracket and having a connecting protrusion passing through the wall of the oil tank;

[0007] An operating rod is rotatably inserted into the mounting seat and the connecting protrusion, and a first sealing component is provided between the connecting protrusion and the operating rod to keep the two sealed;

[0008] An adjusting rod is rotatably inserted into the mounting seat and the connecting protrusion, and a second sealing component is provided between the connecting protrusion and the adjusting rod to keep the two sealed;

[0009] A sealing locking member, threadedly connected to the connecting protrusion and cooperating with the outer side surface of the oil tank barrel wall in a sealing manner;

[0010] The inner sealing structure includes a sealing filler arranged between the mounting seat and the inner side surface of the oil tank barrel wall, and a compensating pressure piece arranged between the mounting seat and the sealing filler. The mounting seat squeezes the sealing filler through the compensating pressure piece under the tightening action of the sealing locking piece, so that the sealing filler is pressurized and filled between the mounting seat and the oil tank barrel wall and seals and holds the connecting protrusion tightly.

[0011] As a preferred embodiment, a connecting hole is provided on the oil tank wall for the connecting protrusion to pass through, and the mounting seat and the oil tank wall are connected to form a sealing cavity surrounding the outside of the connecting hole, and the sealing filler is pressurized and filled in the sealing cavity to seal and contact the mounting seat, the oil tank wall and the connecting protrusion respectively.

[0012] As a preferred solution, the sealing filler is a flexible asbestos filler arranged in the sealing cavity, and the compensating pressure piece is a pressure block structure arranged in the sealing cavity and fixedly connected to the mounting seat.

[0013] As a preferred embodiment, the sealing filler is a rubber filler arranged in the sealing cavity, and the compensating pressure piece includes a compensating protrusion arranged on the mounting seat and accommodated in the sealing cavity to cooperate with the rubber filler, and at least one compensating compression spring arranged between the compensating protrusion and the rubber filler.

[0014] As a preferred solution, the rubber filler is provided with a mating groove suitable for accommodating the compensating protrusion, the mounting seat includes a plurality of positioning holes extending axially through the connecting protrusion, the compensating compression springs are respectively arranged in the plurality of positioning holes, one end of the positioning hole is connected to the mating groove, and the other end thereof is provided with a sealing plug for limiting the compensating compression spring.

[0015] As a preferred solution, a first through hole for the operating rod to pass through and two first annular grooves formed at both ends of the first through hole are provided between the mounting seat and the connecting protrusion; the first sealing assembly includes at least one first sealing ring respectively arranged in the two first annular grooves and sleeved on the operating rod, and two first sealing sleeves arranged at the opening positions of the two first annular grooves, the operating rod passes through the two first sealing sleeves and extends out of the two ends of the mounting seat, and the operating rod is provided with a first limiting structure for limiting and fastening the two first sealing sleeves in the first annular grooves.

[0016] As a preferred solution, the first limiting structure includes a first limiting sleeve fixed on the inner end of the operating rod, and a first bent portion bent and formed on the outer end of the operating rod, the first limiting sleeve and the first bent portion respectively limit and press the two first sealing sleeves, so that the first sealing sleeve is pressurized and maintains a tight connection with the first sealing ring in the first annular groove, and a first step component that cooperates with the first sealing ring and the first sealing sleeve is provided in the first annular groove.

[0017] As a preferred solution, a second through hole for the adjusting rod to pass through and two second annular grooves formed at both ends of the second through hole are provided between the mounting seat and the connecting protrusion; the second sealing assembly includes at least one second sealing ring respectively arranged in the two second annular grooves and sleeved on the adjusting rod, and a second sealing sleeve arranged at the opening position of the two second annular grooves, the adjusting rod passes through the two first sealing sleeves and extends out of the two ends of the mounting seat, and the adjusting rod is provided with a second limiting structure for limiting and fastening the two second sealing sleeves in the second annular grooves.

[0018] As a preferred solution, the second limiting structure includes a second limiting sleeve fixed on the inner end of the adjusting rod, and a second bent portion bent and formed on the outer end of the adjusting rod, the second limiting sleeve and the second bent portion respectively limit and press the two second sealing sleeves, so that the second sealing sleeves are pressurized and maintained in a tight connection with the second sealing ring in the second annular groove, and a second step component is provided in the second annular groove to cooperate with the first sealing ring and the first sealing sleeve.

[0019] As a preferred solution, the outer peripheral side wall of the connecting protrusion is provided with a threaded structure, the sealing locking member is a sealing flange connected to the connecting protrusion, and an external sealing gasket is provided between the sealing flange and the outer side surface of the oil tank barrel wall.

[0020] As a preferred embodiment, it also includes an overload alarm component arranged on the mounting base for indicating an overload fault of the circuit breaker, the overload alarm component includes a third through hole penetrating the mounting base and the connecting protrusion, and a conductive rod and an alarm indicator light connected to the third through hole, the alarm indicator light is arranged at one end of the third through hole, the other end of the conductive rod passes through the second through hole and is connected to the alarm wiring harness, a sealed lampshade covering the alarm indicator light is threadedly connected to the connecting protrusion, and a third sealing sleeve is arranged between the conductive rod and the third through hole to seal the other end of the third through hole.

[0021] As a preferred solution, the conductive rod is connected to the alarm wiring harness through a plug connector structure, which includes a female plug connector sleeved on the conductive rod and a male plug connector correspondingly arranged on the alarm wiring harness. An elastic locking hole is provided at one end of the female plug connector, and the male plug connector is inserted into the elastic locking hole. An insulating sheath is sleeved on the conductive rod.

[0022] Compared with the prior art, the technical solution of the present invention has the following advantages:

[0023] 1. In the sealing operation structure of the oil-immersed circuit breaker provided by the present invention, the mounting seat is locked on the oil tank barrel wall through the threaded cooperation of the connecting protrusion and the sealing locking piece. By providing a sealing filler between the mounting seat and the inner side of the oil tank barrel wall, and the sealing locking piece is in sealing contact with the outer side of the oil tank barrel wall, the sealing filler is squeezed by the compensating pressure piece when the mounting seat is locked and filled between the mounting seat and the oil tank barrel wall and seals and holds the connecting protrusion tightly, thereby achieving an internal and external double sealing installation effect between the mounting seat and the oil tank barrel wall, and the deformation amount generated by the pressure of the sealing filler can compensate for the slight deformation of the oil tank barrel wall, thereby avoiding the occurrence of The first sealing component and the second sealing component respectively play a sealing connection role for the operating rod and the adjusting rod which are penetrated on the mounting seat, so that the operating structure of the circuit breaker installed on the oil tank wall has good sealing performance, so that the operating structure and the oil tank wall are installed in coordination to achieve an oil sealing effect, which can prevent transformer oil leakage and external impurities from invading, thereby ensuring the safe operation of the circuit breaker and the transformer, improving work efficiency, reducing maintenance costs and extending product service life.

[0024] 2. In the sealing operation structure of the oil-immersed circuit breaker provided by the present invention, the sealing filler is preferably a rubber filler arranged in the sealing cavity, a compensating protrusion matched with the rubber filler is provided on the mounting seat, and a compensating compression spring is provided between the compensating protrusion and the rubber filler. With this structural arrangement, when the mounting seat is fastened to the wall of the oil tank, the rubber filler is squeezed by the compensating protrusion and the compensating compression spring, and the compensating compression spring can play a pressure compensation role, so that a compression force is generated between the rubber filler and the mounting seat and the wall of the oil tank, and the rubber filler can generate a certain radial force under the action of the compression force and tightly contact with the mounting protrusion, and fill the gap between the mounting seat and the wall of the oil tank, forming a self-sealing mechanism, thereby playing a sealing role between the mounting seat and the wall of the oil tank, so as to ensure that the operating structure is installed on the wall of the oil tank to achieve a high-pressure sealing effect without leakage, and the sealing effect is good.

[0025] 3. In the sealing operation structure of the oil-immersed circuit breaker provided by the present invention, a plurality of positioning holes with connecting matching grooves are penetrated between the compensation protrusion and the mounting seat, and a plurality of compensation compression springs are respectively installed in the plurality of positioning holes, and then the compensation compression springs are squeezed in the positioning holes by locking the sealing plugs. In this structural arrangement, the sealing plug is used to seal the other end of the positioning hole and to limit the installation of the compensation compression spring, so that one end of the compensation compression spring passes through the positioning hole and abuts against the matching groove of the rubber filler. The compensation compression spring is easy to install and improves the installation efficiency. The sealing pre-tightening of the rubber filler by the plurality of compensation compression springs plays an elastic compensation role, ensuring that the rubber filler is installed in the sealing cavity with uniform force. The rubber filler has the characteristics of elastic-plasticity, chemical stability, impermeability, wear resistance, temperature resistance and easy assembly and disassembly.

[0026] 4. In the sealed operation structure of the oil-immersed circuit breaker provided by the present invention, the operating rod is rotatably inserted into the first through hole of the mounting seat, and two first annular grooves are provided in the first through hole, and the first sealing ring and the first sealing sleeve for the operating rod to pass through are respectively provided in the two first annular grooves. The advantage of such a design is that the second sealing sleeve seals the adjusting rod, reduces direct friction and wear, and cooperates with multiple second sealing rings to achieve internal and external double sealing protection and multi-stage structure, and the sealing installation effect of sealing and decompression in stages between the adjusting rod and the mounting seat. Even if the first sealing ring at one end of the first through hole is aged or fails, the first sealing ring provided at the other end of the second through hole can still ensure the sealing performance of the operating rod, thereby ensuring the sealing of the operating rod installation. The operating rod and the adjusting rod are sealed and connected by adopting the same multi-stage sealing measures as above, thereby avoiding other accidents such as electrical safety and fire safety caused by oil leakage, and at the same time reducing operation and maintenance costs, increasing product service life, and ensuring safety.

[0027] 5. In the sealed operation structure of the oil-immersed circuit breaker provided by the present invention, a conductive rod and an alarm indicator light are arranged in the third through hole of the mounting seat, and the alarm indicator light is threadedly connected at one end of the third through hole. A third sealing sleeve is arranged between the conductive rod and the third through hole and sealed in the other end of the third through hole, and a sealed lampshade covering the alarm indicator light is threadedly connected to the connecting protrusion, and the sealed lampshade seals and blocks one end of the third through hole. In this design, the two ends of the third through hole are sealed by the sealed lampshade and the third sealing sleeve, thereby ensuring the sealing of the conductive rod and the alarm indicator light, preventing leakage accidents at the installation positions of the conductive rod and the alarm indicator light, and having good sealing effect, safety and reliability.

[0028] 6. In the sealed operating structure of the oil-immersed circuit breaker provided by the present invention, the indicator light is electrically connected to the conductive rod. A female plug connector is provided on the conductive rod, and a male plug connector is provided on the alarm wiring harness accordingly. During installation, the male plug connector is inserted into the corresponding socket of the female plug connector. The electrical connection relationship between the alarm wiring harness, the conductive rod and the alarm indicator light is achieved through the plug-in cooperation of the male plug connector and the female plug connector. The female plug connector elastically locks the male plug connector through the arc spring piece, thereby improving the plug-in contact stability between the male plug connector and the female plug connector, and the plug-in force is uniform. It also has the characteristics of high reliability, good electrical performance, low contact resistance, earthquake resistance, impact resistance, etc., so that the male plug connector and the female plug connector maintain close contact.

[0029] 7. In the sealed operating structure of the oil-immersed circuit breaker provided by the present invention, the sealed operating structure designed by the present technical solution, on the one hand, realizes a double sealing effect between the mounting seat and the oil tank wall through the sealing filler and the outer sealing gasket, and on the other hand, the operating rod and the adjusting rod are respectively installed in multiple stages of sealing on the mounting seat through the first sealing component and the second sealing component, thereby improving the sealing performance of the circuit breaker operating structure, thereby achieving the sealing level required by the design. 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 It is a three-dimensional structural schematic diagram of the sealing operation structure of the oil-immersed circuit breaker of the present invention;

[0032] Figure 2 A side view of the sealing operation structure of the oil-immersed circuit breaker of the present invention;

[0033] Figure 3 It is a front view of the sealing operation structure of the oil-immersed circuit breaker of the present invention;

[0034] Figure 4 This is a schematic diagram of the structure of the sealed operating structure of the present invention after the circuit breaker body is hidden;

[0035] Figure 5 for Figure 3 The schematic cross-sectional structure diagram of the sealing operation structure shown along line AA;

[0036] Figure 6 for Figure 3 The schematic cross-sectional structure diagram of the sealing operation structure shown along line BB;

[0037] Figure 7 It is an enlarged structural schematic diagram of the inner sealing structure of the present invention;

[0038] Figure 8 It is an enlarged structural schematic diagram of another form of the inner sealing structure of the present invention.

[0039] Explanation of the reference numerals: 1. Mechanism bracket; 2. Mounting seat; 20. Connecting protrusion; 21. First through hole; 22. Second through hole; 23. Third through hole; 3. Operating rod; 31. First sealing ring; 32. First sealing sleeve; 33. First limiting sleeve; 34. First bending portion; 4. Adjusting rod; 41. Second sealing ring; 42. Second sealing sleeve; 43. Second limiting sleeve; 44. Second bending portion; 5. Sealing locking piece; 51. External sealing pad; 6. Sealing filler; 7. Compensating pressure piece; 71. Compensating protrusion; 72. Compensating compression spring; 73. Sealing plug; 74. Positioning hole; 8. Alarm indicator light; 81. Conductive rod; 82. Sealing lampshade; 83. Third sealing sleeve; 84. Female plug connector; 85. Male plug connector; 86. Alarm wiring harness; 87. Alarm connection terminal; 9. Oil tank wall; 10. Circuit breaker body. DETAILED DESCRIPTION

[0040] 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.

[0041] 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.

[0042] 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.

[0043] Example

[0044] This embodiment provides Figure 1-Figure 8 The oil-immersed circuit breaker sealing operation structure shown is installed on the wall 9 of the transformer oil tank and is used to connect the circuit breaker body 10 in the oil tank, including:

[0045] A mechanism bracket 1, fixedly connected to the circuit breaker body 10 and arranged opposite to the oil tank wall 9;

[0046] A mounting seat 2, fixed on the mechanism bracket 1, and having a connecting protrusion 20 passing through the oil tank wall 9;

[0047] An operating rod 3 is rotatably provided on the mounting seat 2 and the connecting protrusion 20, a first sealing component is provided between the connecting protrusion 20 and the operating rod 3 to keep the two sealedly connected, the operating rod 3 is used to connect the contact operating mechanism of the circuit breaker, and the opening and closing operations of the circuit breaker body 10 are realized by driving the contact operating mechanism;

[0048] The adjusting rod 4 is rotatably arranged on the mounting seat 2 and the connecting protrusion 20. A second sealing component is arranged between the connecting protrusion 20 and the adjusting rod 4 to keep the two sealed. The adjusting rod 4 is used to connect the overload adjustment structure of the circuit breaker, and the purpose of adjusting the angle of the bimetallic strip is achieved by driving the overload adjustment structure.

[0049] A sealing locking member 5, which is threadedly connected to the connecting protrusion 20 and sealably abuts against the outer side surface of the oil tank wall 9;

[0050] The inner sealing structure includes a sealing filler 6 arranged between the mounting seat 2 and the inner side surface of the oil tank wall 9, and a compensating pressure piece 7 arranged between the mounting seat 2 and the sealing filler 6. Under the tightening action of the sealing locking piece 5, the mounting seat 2 squeezes the sealing filler 6 through the compensating pressure piece 7, so that the sealing filler 6 is pressurized and filled between the mounting seat 2 and the oil tank wall 9 and seals and holds the connecting protrusion 20.

[0051] In the above embodiment, the mounting seat 2 is locked on the oil tank barrel wall 9 through the threaded cooperation between the connecting protrusion 20 and the sealing locking piece 5. A sealing filler 6 is provided between the inner side of the mounting seat 2 and the oil tank barrel wall 9, and the sealing locking piece 5 is in sealing contact with the outer side of the oil tank barrel wall 9. When the mounting seat 2 is locked, the sealing filler 6 is squeezed by the compensating pressure piece 7 and filled between the mounting seat 2 and the oil tank barrel wall 9 and seals and holds the connecting protrusion 20, thereby achieving an internal and external double sealing installation effect between the mounting seat 2 and the oil tank barrel wall 9. The deformation amount generated by the pressure of the sealing filler 6 can compensate for the slight deformation of the oil tank barrel wall 9, thereby avoiding In case of leakage due to connection gap, the sealing compensation function is played, thereby ensuring the reliability and stability of the sealing connection between the mounting seat 2 and the cylinder wall. In addition, the first sealing component and the second sealing component respectively play a sealing connection role for the operating rod 3 and the adjusting rod 4 which are penetrated on the mounting seat 2. In this way, the sealing performance of the circuit breaker operating structure installed on the oil tank cylinder wall is good, so that the operating structure and the oil tank cylinder wall are installed in coordination to achieve an oil sealing effect, which can prevent transformer oil leakage and external impurities from invading, thereby ensuring the safe operation of the circuit breaker and the transformer, improving work efficiency, reducing maintenance costs, and extending product service life.

[0052] In this embodiment, the mounting seat 2 is installed between the mechanism bracket 1 and the oil tank barrel wall 9, and the mounting seat 2 and the mechanism bracket 1 are fixed by riveting or screws. The mechanism bracket 1 is provided with an opening structure for the operating rod 3 and the adjusting rod 4 to pass through, and the oil tank barrel wall 9 is provided with a connecting hole for the connecting protrusion 20 to pass through. The connecting protrusion 20 is a circular protrusion structure, and the connecting hole is a circular hole structure. The outer peripheral side wall of the connecting protrusion 20 is provided with a threaded structure, and the sealing locking member 5 is a sealing flange connected to the connecting protrusion 20. An external sealing gasket 51 is provided between the sealing flange and the outer side surface of the oil tank barrel wall 9, and the sealing connection effect between the sealing flange and the oil tank barrel wall 9 is further enhanced by the external sealing gasket 51.

[0053] Combination Figure 5-Figure 6 As shown, the mounting seat 2 and the oil tank wall 9 are connected to form a sealing cavity around the outside of the connecting hole, and the sealing filler 6 is filled in the sealing cavity under pressure to seal and contact the mounting seat 2, the oil tank wall 9 and the connecting protrusion 20 respectively. The packing sealing method is adopted to achieve the sealing pre-tightening effect through the fit of the packing with the mounting seat 2 and the surface of the oil tank wall 9. The packing seal has a simple structure, convenient installation, reliable sealing and long service life. Among them, the sealing filler material should have the characteristics of elastic plasticity, chemical stability, impermeability, self-lubrication, wear resistance, temperature resistance and easy assembly and disassembly.

[0054] Combine the following Figure 5-Figure 8 The specific setting method of the inner sealing structure is described in detail:

[0055] As a preferred embodiment, refer to Figure 8 The sealing packing 6 is a rubber packing arranged in the sealing cavity, and the compensating pressure piece 7 includes a compensating protrusion 71 arranged on the mounting seat 2 and accommodated in the sealing cavity and cooperating with the rubber packing, and at least one compensating compression spring 72 arranged between the compensating protrusion 71 and the rubber packing. With this structural arrangement, when the mounting seat is fastened to the oil tank barrel wall 9, the rubber packing is squeezed by the compensating protrusion 71 and the compensating compression spring 72. The compensating compression spring 72 can play a pressure compensation role, so that a compression force is generated between the rubber packing and the mounting seat 2 and the oil tank barrel wall 9, so that the rubber packing can generate a certain radial force under the action of the compression force and closely contact with the connecting protrusion 20, and fill the gap between the mounting seat 2 and the oil tank barrel wall 9, forming a self-sealing mechanism, thereby playing a sealing role between the mounting seat 2 and the oil tank barrel wall 9, so as to ensure that the operating structure is installed on the oil tank barrel wall to achieve a high-pressure sealing effect without leakage, and the sealing effect is good.

[0056] It is further preferred that the rubber filler is provided with a matching groove suitable for accommodating the compensation protrusion 71, the matching groove is an annular groove structure, the compensation protrusion 71 is a matching annular protrusion structure, the mounting seat 2 includes a plurality of positioning holes 74 extending along its axial direction and passing through the connecting protrusion 20, the compensation compression springs 72 are respectively arranged in the plurality of positioning holes 74, one end of the positioning hole 74 is connected to the matching groove, and the other end thereof is provided with a sealing plug 73 for limiting the compensation compression spring. With this structural arrangement, the plurality of compensation compression springs 72 are respectively installed in the plurality of positioning holes 74, and then locked by the sealing plug 73. The compensating compression spring is squeezed in the positioning hole 74, and the sealing plug 73 is used to seal the other end of the positioning hole 74 and limit the installation of the compensating compression spring, so that one end of the compensating compression spring 72 passes through the positioning hole 74 and abuts against the matching groove of the rubber filler. This compensating compression spring 72 is easy to install and improves the installation efficiency. The multiple compensating compression springs 72 play an elastic compensation role in the sealing pre-tightening of the rubber filler, ensuring that the rubber filler is installed in the sealing cavity with uniform force. This rubber filler has the characteristics of elastic plasticity, chemical stability, impermeability, wear resistance, temperature resistance and easy assembly and disassembly, and is suitable for the installation environment of the transformer. Obviously, the compensating compression spring 72 can also be selected to be set between the compensating protrusion 71 and the rubber filler. It only needs to simply adjust the matching form, make the compensating compression spring 72 into a size that matches the matching groove and install it in the matching groove, and then squeeze the compensating compression spring through the compensating protrusion.

[0057] As an alternative to the above-mentioned sealing filler 6 and compensating pressure piece 7, refer to Figure 7The sealing filler 6 is a flexible asbestos filler arranged in the sealing cavity, and the compensating pressure piece 7 is a pressure block structure arranged in the sealing cavity and fixedly connected to the mounting seat 2. This elastic graphite filler has the characteristics of low density, high compression, and recovery of deformation after losing pressure. Therefore, when the mounting seat 2 is fastened to the oil tank barrel wall 9, the flexible asbestos filler is squeezed by the pressure block structure, so that the flexible asbestos filler is filled between the mounting seat 2 and the oil tank barrel wall 9 under the action of the pressing force and seals and holds the connecting protrusion 20, and fills the gap between the mounting seat 2 and the oil tank barrel wall 9, forming a self-sealing mechanism, thereby playing a sealing role between the mounting seat 2 and the oil tank barrel wall 9. Those skilled in the art can make a choice of the specific setting method of the inner sealing structure according to the above description, and will not be repeated here.

[0058] Combine the following Figure 1-Figure 5 The specific setting method of the operating lever and the adjusting lever is described in detail:

[0059] A first through hole 21 through which the operating rod 3 can pass and two first annular grooves formed at both ends of the first through hole 21 are provided between the mounting seat 2 and the connecting protrusion 20; the first sealing assembly includes at least one first sealing ring 31 respectively arranged in the two first annular grooves and sleeved on the operating rod 3, and two first sealing sleeves 32 arranged at the opening positions of the two first annular grooves, so that the operating rod passes through the two first sealing sleeves and extends out of the two ends of the mounting seat, with reference to Figure 5 Specifically, four first sealing rings are arranged in the two first annular grooves. This is to set multiple sealing rings according to the different pressures inside and outside the oil tank to realize multi-stage sealing connection. The operating rod 3 is provided with a first limiting structure for limiting and fastening two first sealing sleeves 32 in the first annular groove, so that the two first sealing sleeves are respectively kept in close contact with the first sealing ring in the first annular groove. The advantage of such a design is that the first sealing sleeve 32 seals the operating rod and reduces direct friction and wear, and cooperates with multiple first sealing rings 31 to achieve internal and external double sealing protection and multi-stage structure, and sealing and decompression sealing installation effect of stage by stage between the operating rod 3 and the mounting seat 2. Even if the first sealing ring 31 at one end of the first through hole 21 is aged or fails, the first sealing ring 31 arranged at the other end of the second through hole 22 can still ensure the sealing performance of the operating rod, thereby ensuring the sealing of the operating rod installation.

[0060] refer to Figure 5The inner end of the operating rod 3 extends into the oil tank through the mounting seat 2 and is connected to the operating mechanism of the circuit breaker through the connecting rod structure, while the outer end of the operating rod 3 passes through the mounting seat 2 and is located outside the oil tank for operation. In order to ensure the installation sealing and stability of the first sealing sleeve and the first sealing ring in the first annular groove, the first limiting structure includes a first limiting sleeve 33 fixed on the inner end of the operating rod 3, and a first bending portion 34 bent and formed on the outer end of the operating rod. The bending angle of the first bending portion 34 is an acute angle with the end plane of the mounting seat, which can reduce the installation length and is suitable for the operator to rotate the operating rod. The first limiting sleeve 33 and the first bending portion 34 respectively limit and press the two first sealing sleeves 32, so that the first sealing sleeve 32 is pressed and maintained in a tight fit connection with the first sealing ring 31 in the first annular groove. A first step component matching the first sealing ring and the first sealing sleeve is provided in the first annular groove. The first step component is composed of two annular steps formed in the first annular groove, which plays a positioning role for the first sealing ring and the first sealing sleeve. The advantage of adopting the above-mentioned first limiting structure is that the two first sealing sleeves 32 are limited and installed by the first limiting sleeve 33 and the first bending portion 34, so that the first sealing sleeve and the first sealing ring are kept in a tight-fitting installation state in the first annular groove to prevent the first sealing sleeve and the first sealing ring from displacement and leakage accidents in the first annular groove. The use of multi-section sealing connection can ensure the sealing of the operating rod in static and dynamic conditions.

[0061] It is further preferred that a second through hole 22 for the adjusting rod 4 to pass through and two second annular grooves formed at both ends of the second through hole 22 are provided between the mounting seat 2 and the connecting protrusion 20; the second sealing assembly includes at least one second sealing ring 41 respectively arranged in the two second annular grooves and sleeved on the adjusting rod 4, and a second sealing sleeve 42 arranged at the opening position of the two second annular grooves, the adjusting rod 4 passes through the two second sealing sleeves and extends out of the two ends of the mounting seat 2. This is based on the different internal and external pressures of the oil tank, specifically, a second sealing ring and a second sealing sleeve are arranged in one of the second annular grooves, and three second sealing sleeves are arranged in the other second sealing ring. A sealing ring and a second sealing sleeve, a total of four second sealing rings and two second sealing sleeves are set to realize multi-stage sealing connection, and the adjusting rod 4 is provided with a second limiting structure for limiting and fastening the two second sealing sleeves in the second annular groove, so that the two second sealing sleeves 42 are respectively kept in close contact with the second sealing ring 41 in the second annular groove. This structural setting, through the second sealing sleeve 42, seals the adjusting rod and reduces direct friction and wear, and cooperates with multiple second sealing rings 41 to realize internal and external double sealing protection and multi-stage structure, and sealing installation effect of stage-by-stage sealing and decompression between the adjusting rod 4 and the mounting seat 2, thereby ensuring the sealing of the adjusting rod installation.

[0062] refer to Figure 6 The inner end of the adjusting rod 4 extends into the oil tank through the mounting seat 2 and is connected to the overload adjustment mechanism of the circuit breaker through the connecting rod structure, while the outer end of the adjusting rod 4 passes through the mounting seat and is located outside the oil tank for operation. The adjusting rod and the operating rod are arranged in parallel on the mounting seat. In order to ensure the installation sealing and stability of the second sealing sleeve and the second sealing ring in the second annular groove, the second limiting structure includes a second limiting sleeve 43 fixed on the inner end of the adjusting rod 4, and a second bending portion 44 bent and formed on the outer end of the adjusting rod 4. The bending angle of the second bending portion 44 is an acute angle with the end plane of the mounting seat. The second limiting sleeve 43 and the second bending portion 44 respectively limit and press the two second sealing sleeves 42, so that the second sealing sleeve 42 is pressed and maintained in a tight fit connection with the second sealing ring 41 in the second annular groove. A second step component cooperating with the first sealing ring and the first sealing sleeve is provided in the second annular groove. The second step component is composed of two annular steps formed in the second annular groove, which plays a positioning role for the second sealing ring and the second sealing sleeve. The advantage of adopting the above-mentioned second limiting structure is that the second limiting sleeve 43 and the second bending portion 44 play a limiting installation role on the two second sealing sleeves 42, so that the second sealing sleeve and the second sealing ring are kept in a tight-fitting installation state in the second annular groove to prevent the first sealing sleeve and the first sealing ring from displacement leakage accidents in the first annular groove, and the use of multi-stage sealing connection can ensure the sealing of the adjustment rod in static and dynamic conditions. It can be seen from the above that the operating rod 3 and the adjustment rod 4 of this embodiment adopt the same multi-end sealing measures mentioned above to achieve internal and external sealing installation, thereby avoiding other accidents such as electrical safety and fire safety caused by oil leakage, while also reducing operation and maintenance costs and ensuring safety.

[0063] The sealed operation structure of the oil-immersed circuit breaker of this embodiment further includes an overload alarm component arranged on the mounting seat 2 for indicating an overload fault of the circuit breaker, the overload alarm component includes a third through hole 23 penetrating the mounting seat 2 and the connecting protrusion 20, and a conductive rod 81 and an alarm indicator light 8 connected to the third through hole 23, the alarm indicator light 8 is arranged at one end of the third through hole 23, and the other end of the conductive rod 81 passing through the second through hole 22 is connected to the alarm harness 86, refer to Figure 1A group of alarm connection terminals 87 are arranged on one side of the oil-immersed circuit breaker, and the alarm harness 86 is electrically connected to the alarm connection terminals 87. An overload alarm trigger structure for connecting or disconnecting the group of alarm connection terminals 87 is arranged in the circuit breaker body 10. When the circuit breaker is working normally, the overload alarm trigger structure disconnects the circuit between the group of alarm connection terminals 87, that is, disconnects the alarm circuit so that the alarm indicator light 8 is not lit. When an overload fault occurs in the circuit breaker, the overload alarm trigger structure connects the circuit between the group of alarm connection terminals 87, that is, conducts the alarm circuit so that the alarm indicator light 8 is lit. The overload alarm trigger structure is a prior art of the circuit breaker and will not be described in detail here. It can be seen from the above structure that the alarm indicator light 8 is threadedly connected at one end of the third through hole 23, and a third sealing sleeve 83 is provided between the conductive rod 81 and the third through hole 23 to seal the other end of the third through hole 23, and a sealing lampshade 82 is threadedly connected to the connecting protrusion to cover the alarm indicator light 8. Specifically, a sealing ring is provided between the sealing lampshade and the connecting protrusion. The sealing lampshade 82 designed for such installation seals and blocks one end of the third through hole 23. Such design realizes sealing of both ends of the third through hole 23 through the sealing lampshade 82 and the third sealing sleeve 83, thereby ensuring the sealing of the conductive rod 81 and the alarm indicator light 8 to prevent leakage accidents at the installation positions of the conductive rod 81 and the alarm indicator light 8, with good sealing effect and safety and reliability.

[0064] Combination Figure 1 and Figure 5 As shown, the conductive rod 81 is connected to the alarm harness 86 through a plug structure, and the plug structure includes a female plug connector 84 sleeved on the conductive rod 81, and a male plug connector 85 correspondingly arranged on the alarm harness 86. One end of the female plug connector 84 is provided with an arc spring piece and an elastic locking hole formed in the arc spring piece, and the male plug connector 85 is inserted into the elastic locking hole. During installation, as long as the male plug connector 85 is correspondingly inserted into the jack of the female plug connector 84, the electrical connection relationship between the alarm harness 86, the conductive rod 81 and the alarm indicator light 8 is realized through the plug-in cooperation of the male plug connector 85 and the female plug connector 84. This female plug connector 84 elastically locks the male plug connector 85 through the arc spring piece, thereby improving the plug-in contact stability between the male plug connector 85 and the female plug connector 84, and the plug-in force is uniform. It also has the characteristics of high reliability, good electrical performance, low contact resistance, earthquake resistance, and impact resistance, so that the male plug connector and the female plug connector maintain close contact. Among them, an insulating sheath is provided on the conductive rod, and only the two ends of the conductive rod are connected to the alarm indicator light and the female plug connector respectively, so that the conductive rod is insulated from the mounting seat and the oil tank wall and the ground through the insulating sheath.

[0065] In summary, it can be seen that the sealed operating structure designed by the present technical solution, on the one hand, realizes the internal and external double sealing effects between the mounting seat 2 and the oil tank wall 9 through the sealing filler 6 and the outer sealing gasket 51, and on the other hand, the operating rod 3 and the adjusting rod 4 respectively realize the internal and external multiple sealing protection and multi-stage sealing installation effects on the mounting seat 2 through the first sealing component and the second sealing component, and the alarm indicator light 8 realizes multiple sealing installation on the mounting seat 2 through the third sealing sleeve and the sealing lampshade, thereby improving the sealing performance of the circuit breaker operating structure, thereby achieving the sealing level required by the design.

[0066] 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. A sealed operating structure for an oil-immersed circuit breaker, mounted on a transformer oil tank wall (9) and used to connect a circuit breaker body (10) in the oil tank, characterized in that: include: A mechanism bracket (1) is fixedly connected to the circuit breaker body (10) and is arranged opposite to the oil tank wall (9); A mounting seat (2) fixed on the mechanism bracket (1) and having a connecting protrusion (20) passing through the oil tank wall (9); An operating rod (3) is rotatably inserted into the mounting seat (2) and the connecting protrusion (20), and a first sealing component is provided between the connecting protrusion (20) and the operating rod (3) to keep the two in sealed connection; An adjusting rod (4) is rotatably inserted into the mounting seat (2) and the connecting protrusion (20), and a second sealing component is provided between the connecting protrusion (20) and the adjusting rod (4) to keep the two in sealed connection; A sealing locking member (5) is threadedly connected to the connecting protrusion (20) and cooperates with the outer side surface of the oil tank wall (9) to seal. The inner sealing structure comprises a sealing filler (6) arranged between the mounting seat (2) and the inner side surface of the oil tank barrel wall (9), and a compensating pressure piece (7) arranged between the mounting seat (2) and the sealing filler (6). Under the tightening action of the sealing locking piece (5), the mounting seat (2) squeezes the sealing filler (6) through the compensating pressure piece (7), so that the sealing filler (6) is pressed and filled between the mounting seat (2) and the oil tank barrel wall (9) and tightly seals the connecting protrusion (20).

2. According to claim 1, the sealed operating structure of an oil-immersed circuit breaker is characterized in that: The oil tank wall (9) is provided with a connection hole through which the connection protrusion (20) can pass, and the mounting seat (2) and the oil tank wall (9) are connected to form a sealing cavity surrounding the outside of the connection hole, and the sealing filler (6) is filled in the sealing cavity under pressure and is in sealing contact with the mounting seat (2), the oil tank wall (9) and the connection protrusion (20) respectively.

3. The sealed operating structure of an oil-immersed circuit breaker according to claim 2, characterized in that: The sealing filler (6) is a rubber filler arranged in the sealing cavity, and the compensating pressure piece (7) comprises a compensating convex block (71) arranged on the mounting seat (2) and accommodated in the sealing cavity and cooperating with the rubber filler, and at least one compensating pressure spring (72) arranged between the compensating convex block (71) and the rubber filler.

4. The sealed operating structure of an oil-immersed circuit breaker according to claim 3, characterized in that: The rubber filler is provided with a matching groove suitable for accommodating the compensation protrusion (71), the mounting seat (2) includes a plurality of positioning holes (74) extending along its axial direction and penetrating the connecting protrusion (20), the compensation compression spring (72) is respectively arranged in the plurality of positioning holes (74), one end of the positioning hole (74) is connected to the matching groove, and the other end thereof is provided with a sealing plug (73) for limiting the compensation compression spring.

5. The sealed operating structure of an oil-immersed circuit breaker according to claim 2, characterized in that: The sealing filler (6) is a flexible asbestos filler arranged in the sealing cavity, and the compensating pressure piece (7) is a pressure block structure arranged in the sealing cavity and fixedly connected to the mounting seat (2).

6. The sealed operating structure of an oil-immersed circuit breaker according to any one of claims 1 to 5, characterized in that: A first through hole (21) for the operating rod (3) to pass through and two first annular grooves formed at both ends of the first through hole (21) are provided between the mounting seat (2) and the connecting protrusion (20); the first sealing assembly comprises at least one first sealing ring (31) respectively arranged in the two first annular grooves and sleeved on the operating rod (3), and two first sealing sleeves (32) arranged at the opening positions of the two first annular grooves, so that the operating rod (3) passes through the two first sealing sleeves and extends out of the two ends of the mounting seat (2); and a first limiting structure for limiting and fastening the two first sealing sleeves (32) in the first annular grooves is provided on the operating rod (3).

7. The sealed operating structure of an oil-immersed circuit breaker according to claim 6, characterized in that: The first limiting structure comprises a first limiting sleeve (33) fixed on the inner end of the operating rod (3), and a first bent portion (34) formed by bending on the outer end of the operating rod, the first limiting sleeve (33) and the first bent portion (34) respectively limit and press the two first sealing sleeves (32) so that the first sealing sleeves (32) are pressed and tightly connected with the first sealing ring (31) in the first annular groove, and a first step component matching the first sealing ring and the first sealing sleeve is provided in the first annular groove.

8. The sealed operating structure of an oil-immersed circuit breaker according to any one of claims 1 to 5, characterized in that: A second through hole (22) for the adjusting rod (4) to pass through and two second annular grooves formed at both ends of the second through hole (22) are provided between the mounting seat (2) and the connecting protrusion (20); the second sealing assembly comprises at least one second sealing ring (41) respectively arranged in the two second annular grooves and sleeved on the adjusting rod (4), and a second sealing sleeve (42) arranged at the opening position of the two second annular grooves, so that the adjusting rod (4) passes through the two second sealing sleeves and extends out of the two ends of the mounting seat (2); and a second limiting structure for limiting and fastening the two second sealing sleeves in the second annular grooves is provided on the adjusting rod (4).

9. The sealed operating structure of an oil-immersed circuit breaker according to claim 8, characterized in that: The second limiting structure comprises a second limiting sleeve (43) fixed on the inner end of the adjusting rod (4), and a second bent portion (44) bent and formed on the outer end of the adjusting rod (4); the second limiting sleeve (43) and the second bent portion (44) respectively limit and press the two second sealing sleeves (42) so that the second sealing sleeves (42) are pressed and tightly connected with the second sealing ring (41) in the second annular groove; and a second step component cooperating with the first sealing ring and the first sealing sleeve is provided in the second annular groove.

10. The sealed operating structure of an oil-immersed circuit breaker according to claim 1, characterized in that: The outer peripheral side wall of the connecting protrusion (20) is provided with a threaded structure, the sealing locking member (5) is a sealing flange connected to the connecting protrusion (20), and an external sealing gasket (51) is provided between the sealing flange and the outer side surface of the oil tank barrel wall (9).

11. The sealed operating structure of an oil-immersed circuit breaker according to claim 1, characterized in that: The invention also comprises an overload alarm component arranged on the mounting seat (2) for indicating an overload fault of the circuit breaker, the overload alarm component comprising a third through hole (23) penetrating the mounting seat (2) and the connecting protrusion (20), and a conductive rod (81) and an alarm indicator light (8) connected to the third through hole (23), the alarm indicator light (8) being arranged at one end of the third through hole (23), the other end of the conductive rod (81) passing through the second through hole (22) being connected to an alarm harness (86), a sealing lampshade (82) covering the alarm indicator light (8) being threadedly connected to the connecting protrusion, and a third sealing sleeve (83) sealing the other end of the third through hole (23) being arranged between the conductive rod (81) and the third through hole (23).

12. The sealed operating structure of an oil-immersed circuit breaker according to claim 11, characterized in that: The conductive rod (81) is connected to the alarm wiring harness (86) via a connector structure, wherein the connector structure comprises a female plug connector (84) sleeved on the conductive rod (81), and a male plug connector (85) correspondingly arranged on the alarm wiring harness (86), wherein one end of the female plug connector (84) is provided with an elastic locking hole, and the male plug connector (85) is inserted into the elastic locking hole, and an insulating sheath is sleeved on the conductive rod (81).

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