CN113921298B - Resistor contact and breaker using same - Google Patents
Resistor contact and breaker using same Download PDFInfo
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- CN113921298B CN113921298B CN202111033608.0A CN202111033608A CN113921298B CN 113921298 B CN113921298 B CN 113921298B CN 202111033608 A CN202111033608 A CN 202111033608A CN 113921298 B CN113921298 B CN 113921298B
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- guide rod
- face
- connecting rod
- resistive contact
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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 resistor contact and a circuit breaker using the resistor contact, wherein the resistor contact comprises a contact main body, a shielding cover and a guide rod, and the contact main body is used for conducting contact fit with a corresponding contact in opposite directions; 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 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 riveting structure which is used for turning outwards and riveting the step and is in stop fit with the step. According to the invention, a process hole does not need to be formed in the head of the contact main body, so that an electric field is optimized, the reliability of a product is improved, and loosening caused by 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, and belongs to the field of manufacturing of high-voltage electrical equipment.
Background
The switching-on resistor is one of key electrical protection components of ultra-high voltage power transmission and transformation equipment and is used for limiting overvoltage caused by a high-voltage circuit breaker in the switching-on and switching-off operation process, damping and absorbing oscillation energy, avoiding damage of the overvoltage to the power equipment, realizing rapid and reliable fault loop removal and guaranteeing normal operation of a fault-free part.
The reliability of the switching of the resistor contacts is the key for realizing the switching-on resistor function. In the prior art, a resistor contact, such as a circuit breaker and a resistor fracture contact thereof disclosed in the application number CN112349521A, is a resistor contact, and the resistor fracture contact is screwed and assembled with a guide rod through a thread structure, and a certain moment is required to be applied during assembly, so that a process hole is required to be added on the contact so as to apply the moment, and the existence of the process hole not only deteriorates the electric field of the resistor contact, but also increases the processing difficulty of parts; meanwhile, in the process of multiple opening and closing operations of the circuit breaker, the screwing torque of the threaded structure is reduced or even lost after the resistor contact is collided for multiple times, and then electrical contact failure and mechanical failure are caused.
Disclosure of Invention
The invention aims to provide a resistor contact which is used for solving the technical problems that in the prior art, a process hole is formed in the resistor contact to cause electric field cracking, and a screw thread screwing structure is easy to reduce torque after multiple opening and closing operations. The invention also aims to provide a circuit breaker using the resistor 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, and 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 body and having a cylindrical cover body overhanging the rear of the contact 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 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 riveting structure which is used for turning outwards and riveting 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 the flanging riveting structure, so that looseness 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 invention does not need to open a process hole at the head of the contact body, optimizes the electric field and improves the reliability of the product. In addition, the structure adopting interference connection and flanging riveting cooperation can adopt a press machine to carry out mechanized assembly, thereby reducing labor intensity and assembly dispersibility and improving product reliability.
Further, 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 folded edge, the connecting folded edge is attached to the annular end face, and the indirect stop fit is realized between the front end face of the guide rod and the connecting folded edge through the connecting folded edge. The axial position of the shielding cover is kept by the clamping force between the guide rod and the contact body through arranging the connecting folded edge and clamping the connecting folded edge between the guide rod and the contact body.
Further, in order to prevent the circumferential rotation of the shielding case, a rotation stopping structure for limiting the circumferential rotation of the shielding case is arranged between the connecting flange and the annular end face or between the connecting flange and the front end face of the guide rod.
Further, a threaded hole is formed in the annular end face, a through hole is correspondingly formed in the connecting folded edge, the connecting folded edge is attached to and fixed to the annular end face through a mounting screw in the through hole and the threaded hole, and the screw forms a rotation stopping structure. Because the contact main body and the shielding cover are made of different materials, the problem that the contact main body and the connecting flange are easy to open in a welding mode can be avoided by adopting a mode of connecting the contact main body and the connecting flange by adopting a screw in a rotation stopping mode, and in addition, the shielding cover and the contact main body can be detached by adopting the screw in a detachable connection mode.
Further, in order to conceal the screw to avoid a stop fit between the guide bar and the connection flange, the head of the screw is lower than or flush with the rear side of the connection flange.
Further, the inner hole is a through hole penetrating through two axial ends of the guide rod, and one end, deviating from the contact body, of the through hole is used for enabling an ejector rod of the press machine to extend in so as to rivet the turnover riveting structure. In order to ensure the integrity of the periphery of the guide rod, the invention utilizes the inner hole penetrating through the guide rod to extend the ejector rod of the press machine during the turning riveting, and an operation hole structure is not required to be arranged on the periphery of the guide rod.
Further, in order to ensure reliable and stable contact of the contact body, the outer convex surface comprises a planar portion at the center and a spherical portion at the periphery of the planar portion, wherein the planar portion is used for being in opposite conductive contact fit with a corresponding contact.
Further, the outer peripheral 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 peripheral surface of the cylindrical cover body. Thus, the smooth connection between the cylindrical cover body and the contact body can be ensured.
Further, the inner hole is provided with a small-diameter section and a large-diameter section, the small-diameter section is in interference fit with the connecting rod, and the transition positions of the small-diameter section and the large-diameter section form the step.
The circuit breaker comprises a moving contact and a fixed contact, wherein at least one of the moving contact and the fixed contact is the 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, and 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 body and having a cylindrical cover body overhanging the rear of the contact 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 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 riveting structure which is used for turning outwards and riveting the step and is in stop fit with the step.
The beneficial effects are that: according to the resistor 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 the flanging riveting structure, so that looseness 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 invention does not need to open a process hole at the head of the contact body, optimizes the electric field and improves the reliability of the product. In addition, the structure adopting interference connection and flanging riveting cooperation can adopt a press machine to carry out mechanized assembly, thereby reducing labor intensity and assembly dispersibility and improving product reliability.
Further, 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 folded edge, the connecting folded edge is attached to the annular end face, and the indirect stop fit is realized between the front end face of the guide rod and the connecting folded edge through the connecting folded edge. The axial position of the shielding cover is kept by the clamping force between the guide rod and the contact body through arranging the connecting folded edge and clamping the connecting folded edge between the guide rod and the contact body.
Further, in order to prevent the circumferential rotation of the shielding case, a rotation stopping structure for limiting the circumferential rotation of the shielding case is arranged between the connecting flange and the annular end face or between the connecting flange and the front end face of the guide rod.
Further, a threaded hole is formed in the annular end face, a through hole is correspondingly formed in the connecting folded edge, the connecting folded edge is attached to and fixed to the annular end face through a mounting screw in the through hole and the threaded hole, and the screw forms a rotation stopping structure. Because the contact main body and the shielding cover are made of different materials, the problem that the contact main body and the connecting flange are easy to open in a welding mode can be avoided by adopting a mode of connecting the contact main body and the connecting flange by adopting a screw in a rotation stopping mode, and in addition, the shielding cover and the contact main body can be detached by adopting the screw in a detachable connection mode.
Further, in order to conceal the screw to avoid a stop fit between the guide bar and the connection flange, the head of the screw is lower than or flush with the rear side of the connection flange.
Further, the inner hole is a through hole penetrating through two axial ends of the guide rod, and one end, deviating from the contact body, of the through hole is used for enabling an ejector rod of the press machine to extend in so as to rivet the turnover riveting structure. In order to ensure the integrity of the periphery of the guide rod, the invention utilizes the inner hole penetrating through the guide rod to extend the ejector rod of the press machine during the turning riveting, and an operation hole structure is not required to be arranged on the periphery of the guide rod.
Further, in order to ensure reliable and stable contact of the contact body, the outer convex surface comprises a planar portion at the center and a spherical portion at the periphery of the planar portion, wherein the planar portion is used for being in opposite conductive contact fit with a corresponding contact.
Further, the outer peripheral 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 peripheral surface of the cylindrical cover body. Thus, the smooth connection between the cylindrical cover body and the contact body can be ensured.
Further, the inner hole is provided with a small-diameter section and a large-diameter section, the small-diameter section is in interference fit with the connecting rod, and the transition positions of the small-diameter section and the large-diameter section form the step.
Drawings
FIG. 1 is a schematic diagram of a resistive contact according to embodiment 1 of the present invention;
FIG. 2 is a schematic diagram of an embodiment 1 of a resistive contact according to the present invention (showing a partial guide);
fig. 3 is a view showing an assembled structure of a contact body and a shield case in embodiment 1 of a resistive contact according to the present invention;
in the figure: 1. a contact body; 11. a head; 111. an outer convex surface; 112. a planar portion; 113. a spherical portion; 114. an annular end face; 12. a connecting rod; 13. turning over the riveting structure; 2. a shield; 21. a cylindrical cover body; 22. connecting and folding edges; 3. a guide rod; 31. a small diameter section; 32. a large diameter section; 34. a circumferential ring groove; 35. an annular protrusion; 36. a step; 4. and (5) a screw.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the particular embodiments described herein are illustrative only and are not intended to limit the invention, i.e., the embodiments described are merely some, but not all, of the embodiments of the invention. The components of the 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 invention, as 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 made by a person skilled in the art without making any inventive effort, are intended to be within the scope of the present invention.
It is noted that relational terms such as "first" and "second", and the like, are 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. Moreover, 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 one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The features and capabilities of the present invention are described in further detail below in connection with the examples.
Specific embodiment 1 of a resistive contact of the present invention: as shown in fig. 1 to 3, the resistive contact in this embodiment is a moving contact structure that can guide movement in the circuit breaker, and of course, the resistive contact may also be a fixed contact in other embodiments.
The resistance contact includes a contact body 1, a shield 2, and a guide bar 3, the axis of the guide bar 3 extending in the front-rear direction. The contact body 1 has a T-shaped structure for being matched with a static contact in a circuit breaker in a conductive contact way, the contact body 1 comprises a head 11 and a connecting rod 12 connected to the rear end of the head 11 and extending backwards, and the head 11 is provided with an outward convex surface 111 protruding forwards and a backward annular end surface 114.
The shield 2 is connected to the contact body 1, and the shield 2 has a cylindrical cover 21 overhanging the rear of the contact body 1, the cylindrical cover 21 being provided around the guide rod 3. In this embodiment, the shielding case 2 further includes a connection flange 22, the connection flange 22 is integrally disposed at the front end of the cylindrical case 21 and extends toward the inner side of the cylindrical case 21, the connection flange 22 has 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 on the annular end face 114 of the contact body 1 by screwing a screw 4 in the threaded hole, the screw 4 limits the shielding case 2 from rotating circumferentially, and the screw 4 forms a rotation stopping structure. In this embodiment, the screw 4 is a countersunk screw 4, the head 11 of the screw 4 being lower than the rear side of the connecting flange 22.
The guide rod 3 is of a hollow structure, inner holes penetrating through two ends in the axial direction are formed in the guide rod 3, and the connecting rod 12 of the contact 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 in 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 turns rivet radially outwards 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 an ejector rod of the press. When the connecting rod 12 is inserted into the inner hole until the front end face of the guide rod 3 is in stop fit with the rear side face of the connecting flange 22, at this time, the connecting rod 12 is inserted into place, the front end face of the guide rod 3 supports and limits the contact body 1 in the axial direction, then the ejector rod of the press machine extends into the inner hole from one end, which is far away from the contact body 1, of the inner hole, and then the rivet turning structure 13 at the rear end of the connecting rod 12 is expanded until the rivet turning structure is in stop fit with the step 36. In order to increase the supporting area of the front end face of the guide rod 3 against the contact body 1, in this embodiment, a ring of annular protrusions 35 are disposed on the outer side of the guide rod 3 at the front end position, and the annular protrusions 35 extend forward to the front end face of the guide rod 3. At the same time, a circumferential ring groove 34 is provided on the outside of the guide rod 3 at the rear of the shield 2.
In this embodiment, in order to ensure reliable and stable press-fit between the contact body 1 and the corresponding resistive contact, the outer convex surface 111 of the head 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 11 is consistent with the spherical radius of the cylindrical cover 21, so that smooth engagement between the two at the transition position can be ensured.
The resistor contact in the invention is assembled by: the shielding cover 2 is fixed on the contact body by the aid of the screws 4, then the contact body 1 connected with the shielding cover 2 is inserted into an inner hole of the guide rod 3 in an interference manner, when the contact body 1 is inserted in place, the front end face of the guide rod 3 and the connecting folded edge 22 are in a blocking and attaching state, then one end, far away from the contact body 1, of the inner hole is extended into a push rod of the press, the push rod expands a riveting structure 13 at the rear end of the connecting rod 12 until being matched with the step 36 in a blocking manner, and therefore the contact body 1 is fixed on the guide rod 3 in an anti-falling manner.
As another embodiment of the present invention, the difference from embodiment 1 described above is that: the guide rod 3 is not of a hollow structure, the inner hole is only used for installing the connecting rod 12, the inner hole does not penetrate through two ends of the guide rod 3, at this time, in order to realize turning riveting of the rear end of the connecting rod 12, a side hole is formed in the outer side wall of the guide rod 3 at the rear end position of the connecting rod 12 and is communicated with the inner hole, so that turning riveting of the rear end of the connecting rod 12 is realized.
As another embodiment of the present invention, the difference from embodiment 1 described above is that: the outer convex surface can be not divided into a plane part and a spherical part, and can be integrally a cambered surface, such as an elliptical cambered surface with a certain change in curvature radius; the outer circumferential surface of the cylindrical cover body can also be an elliptical cambered surface.
As another embodiment of the present invention, the difference from embodiment 1 described above is that: the spherical radius of the head is not equal to that of the cylindrical cover body.
As another embodiment of the present invention, the difference from embodiment 1 described above is that: in the embodiment 1, the shield case and the contact body are separately provided, and in other embodiments, the shield case and the contact body may be integrally provided.
As another embodiment of the present invention, the difference from embodiment 1 described above is that: the shielding cover and the contact body which are arranged in a split way can be welded and fixed.
As another embodiment of the present invention, the difference from embodiment 1 described above is that: in the embodiment 1, the front end face of the guide rod is in stop fit with the connecting folded edge, namely, the front end face of the guide rod is in indirect stop fit with the annular end face of the contact body; in this embodiment, the front end surface of the guide rod is in direct stop fit with the contact body, for example, when the shielding cover is integrally connected with the contact body, i.e. the shielding cover is directly connected to the outer edge of the head of the contact body without providing a connection flange, at this time, the front end surface of the guide rod is in direct stop fit with the annular end surface of the contact body; of course, in this case, a disc spring or a gasket 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 in indirect blocking fit through the gasket or the disc spring.
In a specific embodiment of the circuit breaker, the circuit breaker includes a moving contact and a fixed contact, wherein the moving contact has the same specific structure as that of each embodiment of the resistive contact, and in order to avoid repetition, the description is omitted.
The fixed contact has the same specific structure as the resistor contact in each embodiment.
The above description is only a preferred embodiment of the present invention, and the patent protection scope of the present invention is defined by the claims, and all equivalent structural changes made by the specification and the drawings of the present invention should be included in the protection scope of the present invention.
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) facing backwards;
a shield cover (2) connected to the contact body (1) and having a cylindrical cover body (21) overhanging 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, and the connecting rod (12) extends into the inner hole and is connected with the guide rod (3);
the method is characterized in that; the connecting rod (12) is in interference insertion fit with the inner hole, the front end face of the guide rod (3) is in direct or indirect blocking 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 a turning riveting structure (13) for outwards riveting to the step (36) and blocking fit with the step (36) is arranged at the rear end of the connecting rod (12); the turning rivet structure (13) is a counter bore arranged at the rear end of the connecting rod (12).
2. The resistive contact of claim 1, wherein the resistive contact comprises a conductive material; the front end face of the guide rod (3) is in indirect blocking fit with the annular end face (114), a connecting folded edge (22) is arranged at the front end of the cylindrical cover body (21), the connecting folded edge (22) is attached to the annular end face (114), and the indirect blocking fit is realized between the front end face of the guide rod (3) and the connecting folded edge (22) through the connecting folded edge (22).
3. The resistive contact of claim 2, wherein the resistive contact comprises a conductive material; a rotation stopping structure for limiting circumferential rotation of the shielding cover (2) is arranged between the connecting folded edge (22) and the annular end face (114) or between the connecting folded edge (22) and the front end face of the guide rod (3).
4. A resistive contact according to claim 3, wherein; threaded holes are formed in the annular end face (114), through holes are correspondingly formed in the connecting folded edges (22), the connecting folded edges (22) are fixedly attached to the annular end face (114) through screws (4) installed 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 resistive contact comprises a conductive material; the head (11) of the screw (4) is lower than the rear side of the connecting flange (22) or is flush with the rear side of the connecting flange (22).
6. The resistive contact of claim 1, wherein the resistive contact comprises a conductive material; 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 is away from the contact main body (1), is used for a push rod of a press to extend in so as to rivet the rivet structure (13).
7. The resistive contact of any one of claims 1-6, wherein the resistive contact is configured to be electrically connected to a power source; the outer convex surface (111) comprises a plane part (112) positioned at the center and a spherical surface part (113) positioned at the periphery of the plane part (112), wherein the plane part (112) is used for being matched with a corresponding contact in a facing conductive contact manner.
8. The resistive contact of claim 7, wherein the resistive contact comprises a conductive material; 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 resistive contact is configured to be electrically connected to a power source; the inner hole is provided with a small-diameter section (31) and a large-diameter section (32), the small-diameter section (31) is in interference fit with the connecting rod (12), and the transition positions of the small-diameter section (31) and the large-diameter section (32) form the step (36).
10. A circuit breaker comprises a moving contact and a fixed contact, and is characterized in that; at least one of the moving contact and the fixed contact is the resistor contact as set forth in the preceding 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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| Publication Number | Publication Date |
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| CN113921298A CN113921298A (en) | 2022-01-11 |
| CN113921298B true CN113921298B (en) | 2023-09-29 |
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| CN202111033608.0A Active CN113921298B (en) | 2021-09-03 | 2021-09-03 | Resistor contact and breaker using same |
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