CN113921298A - Resistance contact and circuit breaker using same - Google Patents
Resistance contact and circuit breaker using same Download PDFInfo
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- CN113921298A CN113921298A CN202111033608.0A CN202111033608A CN113921298A CN 113921298 A CN113921298 A CN 113921298A CN 202111033608 A CN202111033608 A CN 202111033608A CN 113921298 A CN113921298 A CN 113921298A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H1/00—Contacts
- H01H1/64—Protective enclosures, baffle plates, or screens for contacts
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- Arc-Extinguishing Devices That Are Switches (AREA)
Abstract
The invention relates to a resistance contact and a circuit breaker using the same, wherein the resistance contact comprises a contact main body, a shielding case and a guide rod, and the contact main body is used for being in opposite conductive contact fit with a corresponding contact; the shielding cover is connected to the contact main body and is provided with a cylindrical cover body which is suspended towards the rear of the contact main body; the axis of the guide rod extends along the front-back direction, an inner hole is formed in the end face of the front end, and the connecting rod extends into the inner hole and is connected with the guide rod; the connecting rod is in interference insertion fit with the inner hole, the front end face of the guide rod is in direct or indirect stop fit with the annular end face after the connecting rod is inserted in place, a backward step is arranged in the guide rod, and the rear end of the connecting rod is provided with a turning and riveting structure which is used for turning outwards and riveting to the step and is in stop fit with the step. According to the invention, a process hole does not need to be formed at the head of the contact main body, the electric field is optimized, the product reliability is improved, and the looseness caused by the collision of the contact in the operation process of the circuit breaker is avoided.
Description
Technical Field
The invention relates to a resistance contact and a circuit breaker using the same, belonging to the field of high-voltage electrical equipment manufacturing.
Background
The switching-on resistor is one of key electrical protection components of ultra-high voltage and extra-high voltage power transmission and transformation equipment, is used for limiting overvoltage caused by the high-voltage circuit breaker in the switching-on and switching-off operation process, absorbing oscillation energy through damping, avoiding damage of the overvoltage to the power equipment, realizing rapid and reliable cutting off of a fault loop and guaranteeing normal operation of a fault-free part.
The reliability of the switching on and off of the resistance contacts is the key for realizing the switching-on resistance function. In the resistance contact in the prior art, for example, a circuit breaker and a resistance fracture contact thereof disclosed in application number CN112349521A, the resistance fracture contact is also a resistance contact, the contact and a guide rod of the resistance contact are screwed together through a threaded structure, and a certain torque needs to be applied during assembly, so that a fabrication hole needs to be added on the contact to facilitate the application of the torque, and the existence of the fabrication hole not only causes the deterioration of an electric field of the resistance contact, but also increases the processing difficulty of parts; meanwhile, in the multiple opening and closing operation process of the circuit breaker, the resistance contact can have reduced or even lost screwing torque of the threaded structure after multiple collisions, and further electrical contact failure and mechanical faults are caused.
Disclosure of Invention
The invention aims to provide a resistance contact, which is used for solving the technical problems that electric field cracking is caused by arranging a fabrication hole on the resistance contact and the torque is reduced easily after multiple opening and closing operations of a thread screwing structure in the prior art. The invention also aims to provide a circuit breaker using the resistance contact.
The invention adopts the following technical scheme:
a resistive contact, comprising: the contact body is used for being in opposite conductive contact fit with a corresponding contact and comprises a head part and a connecting rod which is connected to the rear end of the head part and extends backwards, wherein the head part is provided with an outer convex surface protruding forwards and a backwards annular end surface;
a shield cover connected to the contact main body and having a cylindrical cover body suspended rearward of the contact main body;
the axis of the guide rod extends along the front-back direction, an inner hole is formed in the end face of the front end of the guide rod, and the connecting rod extends into the inner hole and is connected with the guide rod;
the connecting rod is in interference insertion fit with the inner hole, the front end face of the guide rod is in direct or indirect stop fit with the annular end face after the connecting rod is inserted in place, a backward step is arranged in the guide rod, and the rear end of the connecting rod is provided with a turning and riveting structure which is used for turning outwards and riveting to the step and is in stop fit with the step.
The beneficial effects are that: according to the invention, the connecting rod and the guide rod are in interference insertion fit, the guide rod limits the contact main body after the connecting rod is inserted in place, and then the contact main body is fixed at the front end of the guide rod through a flanging riveting structure, so that loosening caused by contact collision in the operation process of the circuit breaker can be avoided, and reliable electric contact is realized. Meanwhile, the head of the contact main body is not required to be provided with a process hole, so that an electric field is optimized, and the reliability of a product is improved. In addition, the press machine can be adopted to carry out mechanical assembly by adopting a structure of interference connection and flanging riveting fit, so that the labor intensity and the assembly dispersity are reduced, and the reliability of the product is improved.
Furthermore, the front end face of the guide rod is in indirect stop fit with the annular end face, the front end of the cylindrical cover body is provided with a connecting folding edge, the connecting folding edge is attached to the annular end face, and the front end face of the guide rod is in indirect stop fit with the connecting folding edge through the connecting folding edge. The connecting folding edge is arranged and clamped between the guide rod and the contact main body, so that the axial position of the shielding cover is kept by utilizing the clamping force between the guide rod and the contact main body.
Furthermore, in order to prevent the shield cover from rotating in the circumferential direction, a rotation stopping structure for limiting the circumferential rotation of the shield cover is arranged between the connecting folding edge and the annular end face or between the connecting folding edge and the front end face of the guide rod.
Furthermore, a threaded hole is formed in the annular end face, a through hole is correspondingly formed in the connecting folding edge, the connecting folding edge is attached and fixed to the annular end face through mounting screws in the through hole and the threaded hole, and the screws form a rotation stopping structure. Because the contact main body and the shielding case are usually made of different materials, the problem that the contact main body is easy to open like a welding mode cannot occur by adopting a mode of connecting the screw rotation stopping connection contact main body and the connection folding edge, and in addition, the shielding case and the contact main body can be detached by adopting the detachable connection of the screw.
Further, in order to hide the screw to prevent the stop fit between the guide rod and the connecting flange, the head of the screw is lower than the rear side surface of the connecting flange or flush with the rear side surface of the connecting flange.
Furthermore, the inner hole is a through hole penetrating through two axial ends of the guide rod, and one end of the through hole, which is deviated from the contact main body, is used for the ejector rod of the pressure machine to stretch into the rivet turning structure for rivet turning. In order to ensure the integrity of the periphery of the guide rod, the inner hole penetrating through the guide rod is used for the ejector rod of the pressure machine to extend into when the rivet is turned over, so that an operation hole structure does not need to be arranged on the periphery of the guide rod.
Further, in order to ensure reliable and stable contact of the contact main body, the convex surface comprises a plane part positioned in the center and a spherical part positioned on the periphery of the plane part, and the plane part is used for being in opposite conductive contact fit with the corresponding contact.
Further, the outer circumferential surface of the cylindrical cover body is a spherical surface, and the radius of the spherical surface part is consistent with the radius of the outer circumferential surface of the cylindrical cover body. Therefore, the cylindrical cover body and the contact main body can be smoothly connected.
Further, the hole has path section and major diameter section, path section with connecting rod interference plug-in mounting cooperation, path section and major diameter section's transition position forms the step.
A circuit breaker comprises a moving contact and a fixed contact, at least one of the moving contact and the fixed contact is a resistor contact, and the resistor contact comprises: the contact body is used for being in opposite conductive contact fit with a corresponding contact and comprises a head part and a connecting rod which is connected to the rear end of the head part and extends backwards, wherein the head part is provided with an outer convex surface protruding forwards and a backwards annular end surface;
a shield cover connected to the contact main body and having a cylindrical cover body suspended rearward of the contact main body;
the axis of the guide rod extends along the front-back direction, an inner hole is formed in the end face of the front end of the guide rod, and the connecting rod extends into the inner hole and is connected with the guide rod;
the connecting rod is in interference insertion fit with the inner hole, the front end face of the guide rod is in direct or indirect stop fit with the annular end face after the connecting rod is inserted in place, a backward step is arranged in the guide rod, and the rear end of the connecting rod is provided with a turning and riveting structure which is used for turning outwards and riveting to the step and is in stop fit with the step.
The beneficial effects are that: according to the resistance contact adopted by the circuit breaker, the connecting rod and the guide rod are in interference insertion fit, the guide rod limits the contact main body after the connecting rod is inserted in place, and then the contact main body is fixed at the front end of the guide rod through a flanging riveting structure, so that loosening caused by collision of the contact in the operation process of the circuit breaker can be avoided, and reliable electric contact is realized. Meanwhile, the head of the contact main body is not required to be provided with a process hole, so that an electric field is optimized, and the reliability of a product is improved. In addition, the press machine can be adopted to carry out mechanical assembly by adopting a structure of interference connection and flanging riveting fit, so that the labor intensity and the assembly dispersity are reduced, and the reliability of the product is improved.
Furthermore, the front end face of the guide rod is in indirect stop fit with the annular end face, the front end of the cylindrical cover body is provided with a connecting folding edge, the connecting folding edge is attached to the annular end face, and the front end face of the guide rod is in indirect stop fit with the connecting folding edge through the connecting folding edge. The connecting folding edge is arranged and clamped between the guide rod and the contact main body, so that the axial position of the shielding cover is kept by utilizing the clamping force between the guide rod and the contact main body.
Furthermore, in order to prevent the shield cover from rotating in the circumferential direction, a rotation stopping structure for limiting the circumferential rotation of the shield cover is arranged between the connecting folding edge and the annular end face or between the connecting folding edge and the front end face of the guide rod.
Furthermore, a threaded hole is formed in the annular end face, a through hole is correspondingly formed in the connecting folding edge, the connecting folding edge is attached and fixed to the annular end face through mounting screws in the through hole and the threaded hole, and the screws form a rotation stopping structure. Because the contact main body and the shielding case are usually made of different materials, the problem that the contact main body is easy to open like a welding mode cannot occur by adopting a mode of connecting the screw rotation stopping connection contact main body and the connection folding edge, and in addition, the shielding case and the contact main body can be detached by adopting the detachable connection of the screw.
Further, in order to hide the screw to prevent the stop fit between the guide rod and the connecting flange, the head of the screw is lower than the rear side surface of the connecting flange or flush with the rear side surface of the connecting flange.
Furthermore, the inner hole is a through hole penetrating through two axial ends of the guide rod, and one end of the through hole, which is deviated from the contact main body, is used for the ejector rod of the pressure machine to stretch into the rivet turning structure for rivet turning. In order to ensure the integrity of the periphery of the guide rod, the inner hole penetrating through the guide rod is used for the ejector rod of the pressure machine to extend into when the rivet is turned over, so that an operation hole structure does not need to be arranged on the periphery of the guide rod.
Further, in order to ensure reliable and stable contact of the contact main body, the convex surface comprises a plane part positioned in the center and a spherical part positioned on the periphery of the plane part, and the plane part is used for being in opposite conductive contact fit with the corresponding contact.
Further, the outer circumferential surface of the cylindrical cover body is a spherical surface, and the radius of the spherical surface part is consistent with the radius of the outer circumferential surface of the cylindrical cover body. Therefore, the cylindrical cover body and the contact main body can be smoothly connected.
Further, the hole has path section and major diameter section, path section with connecting rod interference plug-in mounting cooperation, path section and major diameter section's transition position forms the step.
Drawings
FIG. 1 is a schematic diagram of a resistive contact according to an embodiment 1 of the present invention;
FIG. 2 is a schematic view of a structure of embodiment 1 of a resistance contact according to the present invention (showing a partial guide rod);
fig. 3 is a view showing an assembly structure of a contact body and a shield case in embodiment 1 of a resistance contact according to the present invention;
in the figure: 1. a contact body; 11. a head portion; 111. an outer convex surface; 112. a planar portion; 113. a spherical portion; 114. an annular end face; 12. a connecting rod; 13. a turning and riveting structure; 2. a shield case; 21. a cylindrical cover body; 22. connecting and folding edges; 3. a guide bar; 31. a small diameter section; 32. a large diameter section; 34. a circumferential ring groove; 35. an annular projection; 36. a step; 4. and (4) screws.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
It is noted that relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The features and properties of the present invention are described in further detail below with reference to examples.
Specific embodiment 1 of a resistance contact of the present invention: as shown in fig. 1 to 3, the resistance contact described in this embodiment is a movable contact structure that can move in a guiding manner in the circuit breaker, but may also be a fixed contact in other embodiments.
The resistance contact comprises a contact body 1, a shield 2 and a guide rod 3, the axis of the guide rod 3 extending in a front-to-back direction. The contact body 1 is of a T-shaped structure and is used for being in opposite conductive contact matching with a fixed contact in a circuit breaker, the contact body 1 comprises a head part 11 and a connecting rod 12 which is connected to the rear end of the head part 11 and extends backwards, and the head part 11 is provided with an outer convex surface 111 protruding forwards and an annular end surface 114 facing backwards.
The shielding case 2 is connected to the contact body 1, the shielding case 2 has a cylindrical cover body 21 that overhangs toward the rear of the contact body 1, and the cylindrical cover body 21 covers the periphery of the guide bar 3. In this embodiment, the shield case 2 further includes a connection flange 22, the connection flange 22 is integrally disposed at the front end of the cylindrical cover 21 and extends toward the inner side of the cylindrical cover 21, the connection flange 22 is an annular structure corresponding to the annular end face 114 of the contact body 1, a threaded hole is formed in the annular end face 114, the threaded hole is a blind hole which does not penetrate through the contact body 1, correspondingly, a through hole corresponding to the threaded hole is formed in the connection flange 22, the connection flange 22 is attached and fixed to the annular end face 114 of the contact body 1 by screwing a screw 4 in the threaded hole, the screw 4 limits circumferential rotation of the shield case 2, and the screw 4 forms a rotation stopping structure. In this embodiment, the screw 4 is a countersunk screw 4, and the head 11 of the screw 4 is lower than the rear side of the connecting flange 22.
The guide rod 3 is of a hollow structure, inner holes penetrating through two axial ends are formed in the guide rod, and the connecting rod 12 of the contact main body 1 is inserted into the inner holes of the guide rod 3 and is in interference insertion fit with the inner holes. In this embodiment, the inner hole has a large diameter section 32 and a small diameter section 31, the connecting rod 12 is inserted into the large diameter section 32 in an interference manner, a backward step 36 is formed at the transition position of the large diameter section 32 and the small diameter section 31, the rear end of the connecting rod 12 is provided with a rivet turning structure 13 which is riveted outwards along the radial direction after the connecting rod 12 is inserted in place, the rivet turning structure 13 is a counter bore arranged at the rear end of the connecting rod 12, and the side wall of the counter bore can radially expand and deform under the action of the ejector rod of the press. When the connecting rod 12 is inserted into the inner hole until the front end surface of the guide rod 3 is in stop fit with the rear side surface of the connecting flange 22, the connecting rod 12 is inserted in place, the front end surface of the guide rod 3 axially supports and limits the contact main body 1, then the ejector rod of the press machine extends into the inner hole from one end of the inner hole, which is far away from the contact main body 1, and then the rivet turning structure 13 at the rear end of the connecting rod 12 is expanded until the connecting rod is in stop fit with the step 36. In order to increase the supporting area of the front end of the guide rod 3 facing the contact body 1, in this embodiment, the outer side of the guide rod 3 is provided with a ring-shaped protrusion 35 at the front end position, and the ring-shaped protrusion 35 extends forward to the front end of the guide rod 3. Meanwhile, a circumferential ring groove 34 is formed in the outer side of the guide rod 3 behind the shielding case 2.
In this embodiment, in order to ensure that the contact body 1 and the corresponding resistance contact can be reliably and stably press-fitted, the outer convex surface 111 of the head portion 11 of the contact body 1 includes a planar portion 112 located at the center and a spherical portion 113 located at the periphery of the planar portion 112, the planar portion 112 is circular, the outer peripheral surface of the cylindrical cover 21 is also spherical, and the radius of the spherical portion 113 of the head portion 11 is consistent with the spherical radius of the cylindrical cover 21, so that the two can be smoothly joined at the transition position.
The resistance contact in the invention is assembled: firstly, fixing the shielding cover 2 on the contact body by using a screw 4, then inserting the contact body 1 connected with the shielding cover 2 into an inner hole of the guide rod 3 in an interference manner, when the contact body 1 is inserted in place, at the moment, the front end face of the guide rod 3 and the connecting folded edge 22 are in a blocking and fitting state, then extending into a mandril of a press machine from one end of the inner hole far away from the contact body 1, expanding the rivet turning structure 13 at the rear end of the connecting rod 12 by the mandril until the rivet turning structure is in blocking fit with the step 36, and realizing the anti-falling fixation of the contact body 1 on the guide rod 3.
As another embodiment of the present invention, it is different from embodiment 1 described above in that: guide arm 3 is not hollow structure, and the hole is only used for installing connecting rod 12, and the hole does not link up 3 both ends of guide arm, and at this moment, in order to realize turning over and riveting connecting rod 12 rear end, the lateral wall of guide arm 3 has seted up the side opening in connecting rod 12 rear end position, and the side opening communicates with the hole to this realizes turning over and rivets connecting rod 12 rear end.
As another embodiment of the present invention, it is different from embodiment 1 described above in that: the outer convex surface may not be divided into a plane part and a spherical part, and may be an arc surface as a whole, for example, an elliptical arc surface with a certain change in curvature radius; the outer peripheral surface of the cylindrical cover body can also be an elliptical cambered surface.
As another embodiment of the present invention, it is different from embodiment 1 described above in that: the spherical radius of the head is not equal to that of the cylindrical cover body.
As another embodiment of the present invention, it is different from embodiment 1 described above in that: in embodiment 1, the shield shell and the contact body are provided separately, and in other embodiments, the shield shell and the contact body may be provided integrally.
As another embodiment of the present invention, it is different from embodiment 1 described above in that: the shielding cover and the contact main body which are arranged separately can also be fixed by welding.
As another embodiment of the present invention, it is different from embodiment 1 described above in that: in embodiment 1, the front end surface of the guide rod is in stop fit with the connecting flange, that is, the front end surface of the guide rod and the annular end surface of the contact main body are in indirect stop fit; in the embodiment, the front end surface of the guide rod is directly in stop fit with the contact main body, for example, when the shield cover is integrally connected with the contact main body, that is, the shield cover is directly connected to the outer edge of the head of the contact main body without a connecting flange, and at this time, the front end surface of the guide rod is directly in stop fit with the annular end surface of the contact main body; in this case, a disc spring or a washer may be additionally disposed between the front end surface of the guide rod and the annular end surface, and the front end surface of the guide rod and the annular end surface are indirectly in stop fit via the washer or the disc spring.
In a specific embodiment of the circuit breaker of the present invention, the circuit breaker includes a moving contact and a fixed contact, where the moving contact has the same specific structure as that in each embodiment of the above-mentioned resistance contact, and is not described again to avoid repetition.
The static contact has the same structure as the resistor contacts in the embodiments.
The above description is only a preferred embodiment of the present invention, and not intended to limit the present invention, the scope of the present invention is defined by the appended claims, and all structural changes that can be made by using the contents of the description and the drawings of the present invention are intended to be embraced therein.
Claims (10)
1. A resistive contact, comprising:
the contact body (1) is used for being in opposite conductive contact fit with a corresponding contact and comprises a head part (11) and a connecting rod (12) which is connected to the rear end of the head part (11) and extends backwards, wherein the head part (11) is provided with an outer convex surface (111) protruding forwards and an annular end surface (114) protruding backwards;
a shield case (2) connected to the contact body (1) and having a cylindrical cover body (21) that overhangs toward the rear of the contact body (1);
the axis of the guide rod (3) extends along the front-back direction, an inner hole is formed in the end face of the front end of the guide rod, and the connecting rod (12) extends into the inner hole and is connected with the guide rod (3);
it is characterized in that; the connecting rod (12) is in interference fit with the inner hole, the front end face of the guide rod (3) is in direct or indirect stop fit with the annular end face (114) after the connecting rod (12) is inserted in place, a backward step (36) is arranged in the guide rod (3), and the rear end of the connecting rod (12) is provided with a turning and riveting structure (13) which is used for turning outwards and riveting the turning and riveting structure to the step (36) and is in stop fit with the step (36).
2. The resistive contact of claim 1, wherein; the front end face of the guide rod (3) is in indirect stop fit with the annular end face (114), the front end of the cylindrical cover body (21) is provided with a connecting folding edge (22), the connecting folding edge (22) is attached to the annular end face (114), and the front end face of the guide rod (3) is in indirect stop fit with the connecting folding edge (22) through the connecting folding edge (22).
3. The resistive contact of claim 2, wherein; and a rotation stopping structure for limiting the circumferential rotation of the shielding cover (2) is arranged between the connecting folding edge (22) and the annular end face (114) or between the connecting folding edge (22) and the front end face of the guide rod (3).
4. The resistive contact of claim 3, wherein; threaded holes are formed in the annular end face (114), through holes are correspondingly formed in the connecting folding edge (22), the connecting folding edge (22) is attached and fixed to the annular end face (114) through mounting screws (4) in the through holes and the threaded holes, and the screws (4) form a rotation stopping structure.
5. The resistive contact of claim 4, wherein; the head (11) of the screw (4) is lower than the rear side surface of the connecting folding edge (22) or is flush with the rear side surface of the connecting folding edge (22).
6. The resistive contact of claim 1, wherein; the inner hole is a through hole which penetrates through two axial ends of the guide rod (3), and one end of the through hole, which deviates from the contact main body (1), is used for enabling an ejector rod of a pressure machine to stretch into the rivet turning structure (13) in a rivet turning mode.
7. The resistive contact of any one of claims 1-6, wherein; the outer convex surface (111) comprises a plane part (112) positioned in the center and a spherical part (113) positioned at the periphery of the plane part (112), and the plane part (112) is used for being matched with the corresponding contact in an opposite conductive contact mode.
8. The resistive contact of claim 7, wherein; the outer peripheral surface of the cylindrical cover body (21) is a spherical surface, and the radius of the spherical surface part (113) is consistent with the radius of the outer peripheral surface of the cylindrical cover body (21).
9. The resistive contact of any one of claims 1-6, wherein; the hole has minor diameter section (31) and major diameter section (32), minor diameter section (31) with connecting rod (12) interference plug-in fit, the transition position of minor diameter section (31) and major diameter section (32) forms step (36).
10. A circuit breaker comprises a moving contact and a fixed contact, and is characterized in that; at least one of said moving and stationary contacts is a resistive contact as described in the above claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111033608.0A CN113921298B (en) | 2021-09-03 | 2021-09-03 | Resistor contact and breaker using same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111033608.0A CN113921298B (en) | 2021-09-03 | 2021-09-03 | Resistor contact and breaker using same |
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| CN113921298A true CN113921298A (en) | 2022-01-11 |
| CN113921298B CN113921298B (en) | 2023-09-29 |
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| CN113921298B (en) | 2023-09-29 |
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