Contact device and enclosed bus
By designing a contact device with a simple structure, the conductor deflects along the center of the guide ring and keeps in contact with the guide ring, the stability problems caused by thermal expansion, cold contraction and construction deviation of the closed busbar are solved, and the closed busbar is realized. Good structural performance and stress reduction effect.
Patent Information
- Application Number
- CN202411333076.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-24
- Publication Date
- 2025-01-10
AI Technical Summary
The existing conductor contact devices are complex and diverse in structure and expensive, and when dealing with thermal expansion and contraction of the closed bus and construction deviation, it is difficult to ensure stability and reliability, which affects the operation safety of the closed bus.
A simple structure contact device is designed, including a contact, a support cylinder and a conductor. The conductor can move along the axial direction of the support cylinder and deflect in the center of the guide ring. The contact fingers are in contact with the guide ring to compensate for the angle caused by temperature changes. Change, reduce stress.
It achieves good contact between the conductor and the contact, ensures the structural performance of the closed busbar, reduces the stress caused by thermal expansion and contraction, avoids complex and expensive design links, and improves the stability and modular design of the product.
Smart Images
Figure CN119297632A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of high-voltage switch power transmission equipment, and in particular to a contact device and a closed busbar. Background Art
[0002] Among the numerous power equipment in power grid operation, switchgear is one of them, and enclosed busbar is an important component of switchgear. In the operation and maintenance of equipment, the stability and reliability of enclosed busbar is the basis for the reliable operation of power station, and it is the equipment that cannot fail the most. In recent years, the construction of national power grid has been changing with each passing day, and at the same time, higher requirements have been continuously put forward for the stability of equipment. The development of stable and reliable enclosed busbar equipment is one of the eternal pursuits of manufacturers.
[0003] In the related art, in order to deal with the deviation of the closed busbar joint caused by construction deviation and thermal expansion and contraction of the closed busbar, a large number of conductor contact devices with different structures are designed. The existing conductor contact devices are not only expensive, but also have complex and diverse structures, and need to consider many aspects in terms of stability and reliability, which is not conducive to product management and modular design. Therefore, the design of a closed busbar with a simple structure and stable and reliable structure is a common goal of manufacturers and users. Summary of the invention
[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a contact device, which has a simple structure and stable and reliable operation.
[0005] The present invention also provides a closed busbar using the contact device.
[0006] According to the first aspect of the present invention, a contact device comprises a contact, a support tube and a conductor, wherein the support tube is connected to the contact and is coaxially arranged with the contact, an annular cavity is provided between the contact and the support tube, the annular cavity has an opening at one end along the axial direction of the support tube, the contact is rotatably provided with a contact finger on the side wall facing the annular cavity, a guide ring is provided on the side wall of the support tube facing the annular cavity, a first arc surface is provided on the side of the guide ring away from the support tube, and the guide ring is arranged opposite to the contact finger; the conductor has a hollow structure, one end of the conductor is passed through the annular cavity, the free end of the contact finger and the guide ring are respectively in contact with the inner wall and the outer wall of the conductor, the conductor can move a predetermined displacement along the axial direction of the support tube, and the conductor can be deflected by a predetermined angle along the center of the guide ring.
[0007] The contact device according to the embodiment of the present invention has at least the following beneficial effects: not only is the structure simple and reliable, but also can meet the telescopic design of the conductor and the contact in the axial direction. The conductor can be deflected along the center of the guide ring within a predetermined angle range, and the spacing distance between the contact finger and the guide ring does not change after the deflection. The contact finger maintains a normal abutment against the outer wall of the conductor, thereby maintaining the performance of the conductor when it is inserted into the contact along the axial direction of the contact, so that the contact finger and the conductor maintain good contact, thereby ensuring reliable contact between the contact finger and the conductor, and then ensuring that the closed busbar has good structural performance, thereby compensating for the angle change between the contact and the conductor in the closed busbar caused by the temperature change caused by thermal expansion and contraction, reducing the stress of the closed busbar, and avoiding the cumbersome and expensive design process of overcoming the thermal expansion and contraction effect during the operation of the closed busbar.
[0008] According to some embodiments of the present invention, the guide ring and the contact finger are coaxially arranged.
[0009] According to some embodiments of the present invention, along the radial direction of the support tube, the guide ring has a first cross-section, the contact finger has a second cross-section, and the center of the first cross-section coincides with the center of the second cross-section.
[0010] According to some embodiments of the present invention, the side wall of the support tube is provided with a first groove, the side wall of the contact is provided with a second groove, the guide ring is provided in the first groove, and the contact finger is provided in the second groove.
[0011] According to some embodiments of the present invention, a deflection angle of the conductor along the center of the guide ring is less than or equal to 3°.
[0012] According to some embodiments of the present invention, the guide ring is made of polytetrafluoroethylene.
[0013] According to some embodiments of the present invention, the contact surface between the contact and the contact finger and the contact end surface between the contact finger and the conductor are both provided with a silver-plated layer.
[0014] According to some embodiments of the present invention, the roughness of the first arc surface and the contact end surface of the contact finger and the conductor are all Ra1.6-Ra25.
[0015] According to some embodiments of the present invention, a guiding slope is provided at the end of the conductor, and the guiding slope is used to press the contact finger to rotate the contact finger.
[0016] The enclosed busbar according to the second aspect of the present invention comprises any one of the contact devices described above.
[0017] The closed busbar according to the embodiment of the present invention has at least the following beneficial effects: the closed busbar proposed by the present invention adopts the above-mentioned contact device, which is not only simple and reliable in structure, but also can meet the telescopic design of the conductor and the contact in the axial direction. The conductor can deflect along the center of the guide ring within a predetermined angle range, and the spacing distance between the contact finger and the guide ring does not change after the deflection. The contact finger maintains a normal abutment against the outer wall of the conductor, thereby maintaining the performance of the conductor when the contact is inserted into the contact along the axial direction of the contact, so that the contact finger and the conductor maintain good contact, thereby ensuring reliable contact between the contact finger and the conductor, and then ensuring that the closed busbar has good structural performance, thereby compensating for the angle change between the contact and the conductor in the closed busbar caused by the temperature change caused by thermal expansion and contraction, reducing the stress of the closed busbar, and avoiding the cumbersome and expensive design link of overcoming the thermal expansion and contraction effect when the closed busbar is running. .
[0018] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:
[0020] Figure 1 A schematic structural diagram of a contact device according to an embodiment of the present invention;
[0021] Figure 2 A schematic diagram of the structure of a contact finger of a contact device according to an embodiment of the present invention before compression;
[0022] Figure 3 A schematic diagram of the structure of the contact finger of a contact device after compression according to an embodiment of the present invention;
[0023] Figure 4 This is a schematic structural diagram of a contact device according to an embodiment of the present invention when axial expansion and contraction occurs between a conductor and a contact;
[0024] Figure 5 The diagram is a schematic structural diagram of a contact device according to an embodiment of the present invention when a conductor is deflected relative to the contact.
[0025] Figure Number:
[0026] Contact device 10;
[0027] The contact 100, the chamber 110, the fastener 120, the contact finger 130, the connecting end 131, the free end 132, the second arc surface 133, the second cross section 134, the elastic member 140, and the second groove 150;
[0028] Support cylinder 200, annular cavity 210, guide ring 220, first arc surface 221, first cross section 222, first groove 230;
[0029] Conductor 300 and guiding slope 310 . DETAILED DESCRIPTION
[0030] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.
[0031] In the description of the present invention, it should be understood that descriptions involving orientation, such as left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.
[0032] In the description of the present invention, if there is a description of first and second, it is only for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.
[0033] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.
[0034] In the related art, the temperature of the closed busbar changes when it is in operation or stopped. The temperature change will cause thermal expansion and contraction of the closed busbar, causing the conductor and the contact to expand and contract in the axial direction. Due to construction and assembly errors, there may be a certain angle between the axis of the conductor and the contact. Due to the influence of factors such as thermal expansion and contraction or construction and assembly errors, there may be unreliable contact between the conductor and the contact fingers, posing a safety hazard. In order to overcome the impact of the thermal expansion and contraction effect of the closed busbar, it is necessary to compensate for the closed busbar design. The existing conductor contact device is not only costly, but also has complex and diverse structures, and there are many considerations in terms of stability and reliability, which is not conducive to product management and modular design.
[0035] Therefore, in order to solve the above problems, the present invention proposes a contact device 10 and a closed busbar with a simple structure and stable and reliable operation.
[0036] Reference Figures 1 to 5The contact device 10 provided in the embodiment of the present invention comprises a contact 100, a support tube 200 and a conductor 300. Figure 1 In the illustrated embodiment, the contact 100 has a chamber 110, which is cylindrical. The support tube 200 is arranged in the chamber 110. The support tube 200 is fixed to the bottom wall of the chamber 110 by fasteners 120 such as bolts and screws. The support tube 200 has a cylindrical structure, and the axis of the support tube 200 coincides with the axis of the chamber 110. In other words, the support tube 200 is coaxially arranged with the contact 100, and an annular cavity 210 is provided between the contact 100 and the support tube 200. The annular cavity 210 has an opening at one end along the axial direction of the support tube 200, and one end of the hollow conductor 300 can be inserted into the annular cavity 210 along the opening.
[0037] A contact finger 130 is provided on the side wall of the contact 100 facing the annular cavity 210. The contact finger 130 is rotatably arranged on the side wall of the contact 100. The contact finger 130 has a connection end 131 rotatably connected to the contact 100 and a free end 132 away from the connection end 131. In addition, an elastic member 140 is provided between the contact finger 130 and the contact 100. When the contact finger 130 is rotated by external pressure, the contact finger 130 will press the elastic member 140, causing the elastic member 140 to produce elastic deformation. When the external force applied to the contact finger 130 disappears, the elastic member 140 can restore the contact finger 130 to its original state, and a certain elastic force can be applied to the contact finger 130 through the elastic member 140, so that the contact between the contact finger 130 and the conductor 300 is reliable. A second arc surface 133 is provided at the free end 132 of the contact finger 130, a guide ring 220 is provided on the side wall of the support tube 200 facing the annular cavity 210, a first arc surface 221 is provided on the side of the guide ring 220 away from the support tube 200, and the guide ring 220 is arranged opposite to the contact finger 130; the conductor 300 is a hollow structure, one end of the conductor 300 is passed through the annular cavity 210, the contact finger 130 abuts against the outer wall of the conductor 300 through the second arc surface 133, and the guide ring 220 abuts against the inner wall of the conductor 300 through the first arc surface 221, and the conductor 300 can move a predetermined displacement along the axial direction of the support tube 200. During the installation, debugging and operation of the product, when axial expansion and contraction occur between the contact 100 and the conductor 300, the conductor 300 can reciprocate axially in the contact 100 under the guidance of the support tube 200 and the guide ring 220.
[0038] In addition, the conductor 300 can be deflected at a predetermined angle along the center of the guide ring 220. When an angle is generated between the contact 100 and the conductor 300, the conductor 300 will rotate around the center of the guide ring 220 under the restriction of the arc-shaped outer edge of the guide ring 220, allowing a predetermined angle of deflection to be generated. Only an angular deviation will occur between the conductor 300 and the contact finger 130, and no radial displacement will occur. The contact between the conductor 300 and the contact finger 130 is still reliable.
[0039] In summary, the contact device 10 proposed in the present invention is not only simple and reliable in structure, but also can meet the telescopic design of the conductor 300 and the contact 100 in the axial direction. The conductor 300 can deflect along the center of the guide ring 220 within a predetermined angle range, and the spacing distance between the contact finger 130 and the guide ring 220 does not change after the deflection. The contact finger 130 maintains a normal abutment against the outer wall of the conductor 300, thereby maintaining the performance of the conductor 300 when the contact 100 is inserted into the contact 100 along the axial direction of the contact 100, so that the contact finger 130 and the conductor 300 maintain good contact, thereby ensuring that the contact between the contact finger 130 and the conductor 300 is reliable, and then ensuring that the closed busbar has good structural performance, thereby compensating for the angle change between the contact 100 and the conductor 300 in the closed busbar caused by the temperature change caused by thermal expansion and contraction, reducing the stress of the closed busbar, and avoiding the cumbersome and expensive design link of overcoming the thermal expansion and contraction effect during the operation of the closed busbar.
[0040] It is understandable that, in some embodiments, the positions of the contact 100 and the support cylinder 200 can be interchanged. In other words, the contact 100 is arranged inside the support cylinder 200, and an annular cavity 210 is formed between the contact 100 and the support cylinder 200. Accordingly, the contact finger 130 and the guide ring 220 are arranged at corresponding positions to the abutment position of the conductor 300. The contact device 10 using the structure of this embodiment can also achieve the technical effects described in the above embodiments of the present invention, and therefore should also belong to the protection scope of the present invention.
[0041] Reference Figure 1 , Figure 4 , Figure 5 In some embodiments, the guide ring 220 and the contact finger 130 are coaxially arranged to ensure that when the conductor 300 is inserted into the contact 100, each contact portion of the conductor 300 and the contact finger 130 has good contact, avoiding poor contact and ensuring the conductive performance between the conductor 300 and the contact 100.
[0042] Reference Figure 2In some embodiments, the guide ring 220 and the contact finger 130 are coaxially arranged. Along the radial direction of the support tube 200, the guide ring 220 has a first section 222, and the contact finger 130 has a second section 134. The center of the first section 222 coincides with the center of the second section 134. When the conductor 300 and the contact 100 have an axial displacement, the conductor 300 can be axially adjusted along the guide ring 220; when the conductor 300 and the contact 100 have an angle, the conductor 300 will rotate with the center of the guide ring 220 as the center of the sphere under the restriction of the arc-shaped outer edge of the guide ring 220, allowing a predetermined angle of deflection, and the center of the guide ring 220 is the center of the contact finger 130, so only an angle deviation will occur between the conductor 300 and the contact finger 130 without radial displacement, and the contact between the conductor 300 and the contact finger 130 is still reliable. Compared with the conductor 300 contact device 10 in the related art, the contact device 10 has a simple structure, which not only reduces the product cost, but also avoids a large number of temperature compensation and adjustment designs, and meets the user's requirements for stable, reliable and durable closed busbars. The whole set of device components is simple and can be used as a highly integrated module and is widely applicable to closed busbars of various products.
[0043] Reference Figure 3 In some embodiments, the side wall of the support cylinder 200 is provided with a first groove 230, the side wall of the contact 100 is provided with a second groove 150, the guide ring 220 is provided in the first groove 230, and the contact finger 130 is provided in the second groove 150. The above-mentioned installation structure is adopted to facilitate the assembly of the contact finger 130 and the guide ring 220.
[0044] Reference Figure 5 Due to assembly error or thermal expansion and contraction during operation, the conductor 300 of the closed busbar will have a certain deflection along the center of the guide ring 220, that is, there will be a predetermined angle A between the axis of the conductor 300 and the center line of the guide ring 220. In some embodiments, the deflection angle of the conductor 300 along the center of the guide ring 220 is less than or equal to 3°. Within this angle range, only an angle deviation will occur between the conductor 300 and the contact finger 130 without radial displacement, and the contact between the conductor 300 and the contact finger 130 is still reliable, thereby ensuring the normal operation of the closed busbar. In addition, the plug-in angle between the conductor 300 and the contact 100 can be changed at will, which greatly facilitates the design and on-site construction of the closed busbar.
[0045] In some embodiments, the guide ring 220 is made of polytetrafluoroethylene, which has the characteristics of being smooth and wear-resistant, thereby ensuring the operating life of the closed busbar and extending the service life of the closed busbar.
[0046] The contact 100 and the conductor 300 are connected through the contact finger 130, and electrical connection is achieved by compressing the contact finger 130, which fully ensures reliable contact and sufficiently small contact resistance, creating favorable conditions for the flow of current through the contact device 10. Therefore, in some embodiments, the contact surface of the contact 100 and the contact finger 130 is provided with a silver plating layer, and the contact end surface of the contact finger 130 and the conductor 300, that is, the second arc surface 133 is also provided with a silver plating layer. The roughness of the contact surface of the contact 100 and the contact finger 130 and the contact end surface of the contact finger 130 and the conductor 300 is Ra1.6-Ra25.
[0047] Reference Figure 1 , Figure 2 , Figure 3 The free end 132 of the contact finger 130 is provided with a second arc surface 133, and the maximum distance between the end of the second arc surface 133 facing the opening of the annular cavity 210 and the contact 100 is L1, and the maximum distance between the part where the second arc surface 133 contacts the conductor 300 and the contact 100 is L2, wherein L1 is smaller than L2, so as to facilitate the insertion of the conductor 300 into the annular cavity 210 and prevent the contact finger 130 from forming an obstruction to the conductor 300 during the insertion of the conductor 300 into the annular cavity 210, and a guiding slope is provided at the end of the conductor 300, and the guiding slope is used to press the contact finger 130 to rotate the contact finger 130, and the contact finger 130 rotates and compresses the elastic member 140, so that the elastic member 140 is deformed, thereby facilitating the insertion of the conductor 300 into the annular cavity 210 along the opening of the annular cavity 210, so as to facilitate the assembly of the contact device 10.
[0048] The present invention also proposes a closed busbar, which includes the contact device 10 described in any one of the above items. The closed busbar proposed by the present invention adopts the above contact device 10, which is not only simple and reliable in structure, but also can meet the telescopic design of the conductor 300 and the contact 100 in the axial direction. The conductor 300 can deflect along the center of the guide ring 220 within a predetermined angle range, and the spacing distance between the contact finger 130 and the guide ring 220 does not change after the deflection, and the contact finger 130 maintains a normal abutment against the outer wall of the conductor 300, thereby maintaining the performance of the conductor 300 when the contact 100 is inserted into the contact 100 along the axial direction of the contact 100, so that the contact finger 130 and the conductor 300 maintain good contact, thereby ensuring reliable contact between the contact finger 130 and the conductor 300, and further ensuring that the closed busbar has good structural performance, thereby compensating for the angle change between the contact 100 and the conductor 300 in the closed busbar caused by the temperature change caused by thermal expansion and contraction, reducing the stress of the closed busbar, and avoiding the cumbersome and expensive design link of overcoming the thermal expansion and contraction effect during the operation of the closed busbar.
[0049] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0050] Of course, the present invention is not limited to the above-mentioned embodiments, and those skilled in the art may make equivalent modifications or substitutions without violating the spirit of the present invention, and these equivalent modifications or substitutions are all included in the scope defined by the claims of this application.
Claims
1. A contact device, characterized in that: include: Contacts; A support cylinder is connected to the contact and is coaxially arranged with the contact, an annular cavity is provided between the contact and the support cylinder, the annular cavity has an opening at one end along the axial direction of the support cylinder, the contact is rotatably provided with a contact finger on the side wall facing the annular cavity, the support cylinder is provided with a guide ring on the side wall facing the annular cavity, a first arc surface is provided on the side of the guide ring away from the support cylinder, and the guide ring is arranged opposite to the contact finger; The conductor has a hollow structure, one end of which is passed through the annular cavity, the free end of the contact finger and the guide ring are respectively in contact with the inner wall and the outer wall of the conductor, the conductor can move a predetermined displacement along the axial direction of the support tube, and the conductor can be deflected by a predetermined angle along the center of the guide ring.
2. The contact device according to claim 1, characterized in that: The guide ring and the contact finger are coaxially arranged.
3. The contact device according to claim 2, characterized in that: Along the radial direction of the support tube, the guide ring has a first cross section, the contact finger has a second cross section, and the center of the first cross section coincides with the center of the second cross section.
4. The contact device according to claim 1, characterized in that: The side wall of the support cylinder is provided with a first groove, the side wall of the contact is provided with a second groove, the guide ring is provided in the first groove, and the contact finger is provided in the second groove.
5. The contact device according to claim 1, characterized in that: The deflection angle of the conductor along the center of the guide ring is less than or equal to 3°.
6. The contact device according to claim 1, characterized in that: The guide ring is made of polytetrafluoroethylene.
7. The contact device according to claim 1, characterized in that: The contact surface between the contact head and the contact finger and the contact end surface between the contact finger and the conductor are both provided with a silver-plated layer.
8. The contact device according to claim 1, characterized in that: The roughness of the first arc surface and the contact end surface of the contact finger and the conductor are all Ra1.6-Ra25.
9. The contact device according to claim 1, characterized in that: The end of the conductor is provided with a guiding inclined surface, and the guiding inclined surface is used to press the contact finger to make the contact finger rotate.
10. A closed busbar, characterized in that: The invention comprises a contact device as claimed in any one of claims 1 to 9.