A stationary contact structure and a grounding switch using the same

Abstract

The application provides a static contact structure and a grounding switch using the same. The static contact structure comprises a contact finger seat, a guide cover, a wiring board arranged above the contact finger seat, and a conductive band connected between the wiring board and the contact finger seat. Two symmetrical fixing plates are fixed on the wiring board. The fixing plates have downward extending parts. The extending parts on the left and right sides are connected with the contact finger seat or the guide cover through connecting rods respectively. The connecting rods on the left and right sides are located on the same radial direction and have axes extending along the left-right direction. One end of the connecting rod is fixed with the contact finger seat or the guide cover, and the other end is inserted into the extending part and rotates with the extending part. In use, the contact finger seat, the guide cover and the connecting rod can swing forward and backward relative to the fixing plate as the angle of the moving contact changes, so that the grounding pole can be smoothly, stably and accurately operated. The installation angle does not need to be adjusted during installation, which greatly facilitates the installation operation and improves the installation efficiency.

Description

Technical Field

[0001] This invention relates to the field of stationary contact technology for grounding switches, and more specifically to a stationary contact structure and a grounding switch using the same stationary contact structure. Background Technology

[0002] The valve hall grounding switch is a crucial piece of equipment within the valve hall of an UHVDC converter station, ensuring safety during maintenance of other equipment. It can be installed on the midpoint side, the YY converter transformer side, the YD converter transformer side, or the neutral bus side, depending on system design requirements. In the closed position, it reliably and effectively grounds the converter transformer, neutral bus, and other equipment according to system requirements; and it can withstand system short-circuit currents during system fault conditions.

[0003] Valve hall grounding switches are typically installed on the side wall. The moving contact is fixed at the end of the grounding knife bar and the stationary contact is fixed inside the tube or equalizing ball. The stationary contact usually includes a contact finger seat and a guide cover fixed outside the contact finger seat. The guide cover is used to guide the inserted moving contact. The stationary contact finger is installed on the contact finger seat inside the guide cover.

[0004] During the on-site installation and commissioning of valve hall grounding switches, the installation angle of the stationary contact needs to be repeatedly adjusted to ensure that the grounding bar can perform opening and closing operations smoothly and stably. Currently, the installation and commissioning of the stationary contact is quite cumbersome and inefficient. Furthermore, regardless of the adjustment method, due to the swinging motion of the grounding bar while the stationary contact remains stationary, a certain degree of interference between the stationary and moving contacts is unavoidable, leading to difficulties in the opening and closing process. Summary of the Invention

[0005] The purpose of this invention is to provide a stationary contact structure that is easy to install and can ensure that the grounding switch rod can perform opening and closing operations smoothly and stably; the purpose of this invention is also to provide a grounding switch using the above-mentioned stationary contact structure.

[0006] To achieve the above objectives, the stationary contact structure in this invention adopts the following technical solution:

[0007] A stationary contact structure includes a finger seat and a guide cover fixed outside the finger seat with an opening at the bottom. A stationary finger is installed on the finger seat inside the guide cover. The stationary contact structure also includes a terminal block disposed above the finger seat. A conductive strip connects the terminal block and the finger seat. Two symmetrical fixing plates are fixed on the terminal block. The fixing plates have downwardly extending extensions. The left and right extensions are respectively connected to the finger seat or the guide cover via connecting rods. The connecting rods on the left and right sides are located in the same radial direction and their axes extend in the left and right direction. One end of the connecting rod is fixed to the finger seat or the guide cover, and the other end is inserted into the extension and rotatably engaged with the extension. Alternatively, one end of the connecting rod is fixed to the extension, and the other end is inserted into the finger seat or the guide cover and rotatably engaged with the finger seat or the guide cover.

[0008] The beneficial effects of the above technical solution are as follows: The stationary contact structure also includes a terminal block disposed above the contact finger seat. A conductive strip connects the terminal block and the contact finger seat, meaning that the terminal block and the contact finger seat are electrically connected. Furthermore, the flexibility of the conductive strip allows relative movement between the terminal block and the contact finger seat. Two symmetrically fixed plates are fixed on the terminal block. The extensions of the fixed plates are connected to the contact finger seat or guide cover via connecting rods. The connecting rods on both sides are located in the same radial direction, and their axes extend in the left-right direction. One end of the connecting rod is fixed, while the other end is inserted and rotated. Therefore, the entire contact finger seat and guide cover can swing back and forth around the connecting rods, or the contact finger seat, guide cover, and connecting rod as a whole can swing back and forth relative to the fixed plates. Thus, when the moving contact is inserted into the guide cover in a swinging posture, the guide cover can change accordingly based on the angle change of the moving contact, adaptively swinging back and forth to cooperate with the insertion of the moving contact, ensuring that the grounding knife rod can perform opening and closing operations smoothly, stably, and accurately. Furthermore, since the positions of the finger seat and guide cover do not need to be fixed and the installation angle does not need to be adjusted, the installation operation can be greatly facilitated and the installation efficiency can be improved.

[0009] Furthermore, the guide cover is fixedly connected to the contact finger seat by multiple fixing screws. The guide cover has multiple screw holes along the circumference, and the contact finger seat has threaded holes that correspond one-to-one with the screw holes.

[0010] The beneficial effect of the above technical solution is that it facilitates the connection and disassembly between the guide cover and the finger seat.

[0011] Furthermore, the connecting rod includes a threaded section and a smooth section. The smooth section is inserted into the extension and rotates with the extension. The threaded section passes through the screw hole and is connected to the corresponding threaded hole.

[0012] The advantages of the above technical solution are: it facilitates the fixed connection between the connecting rod and the finger seat, utilizes the screw holes in the guide cover itself and the threaded holes in the finger seat itself, and does not require additional processing of the fixing structure, which is convenient for manufacturing.

[0013] Furthermore, the connecting rod also includes a screwing part located between the threaded section and the smooth section, which is used to rotate the connecting rod and press it against the guide cover.

[0014] The beneficial effects of the above technical solution are that the screwing part not only facilitates the installation of the connecting rod, but also replaces the fixing screw, ensuring the fixed connection effect between the guide cover and the finger seat.

[0015] Furthermore, a cotter pin is installed on the outside of the extension of the connecting rod.

[0016] The advantages of the above technical solution are: it can prevent the connecting rod from detaching from the fixing plate, and it does not require the connecting rod to be very long, which facilitates processing and installation.

[0017] Furthermore, the fixing plate is L-shaped and includes a horizontal plate segment and a vertical plate segment connected vertically. The horizontal plate segment is fixedly connected to the terminal block, and the extension is composed of the vertical plate segment.

[0018] The advantages of the above technical solution are: simple structure, easy to manufacture and install.

[0019] Furthermore, the horizontal plate segment is fixed to the upper surface of the terminal block by locking screws.

[0020] The beneficial effect of the above technical solution is that it facilitates disassembly and assembly.

[0021] Furthermore, there are two conductive strips arranged symmetrically front to back.

[0022] The beneficial effects of the above technical solution are: it facilitates the overall back-and-forth swing of the finger seat and guide cover, while ensuring the flow capacity.

[0023] Furthermore, the upper end of the conductive strip is fixed to the upper surface of the terminal block by an upper connecting screw, and the lower end of the conductive strip is fixed to the upper surface of the contact finger seat by a lower connecting screw.

[0024] The beneficial effect of the above technical solution is that it facilitates disassembly and assembly.

[0025] To achieve the above objectives, the grounding switch in this invention adopts the following technical solution:

[0026] A grounding switch includes a moving contact and a stationary contact structure. The stationary contact structure includes a finger seat and a guide cover fixed outside the finger seat and having an opening at the bottom. A stationary finger is installed on the finger seat inside the guide cover. The stationary contact structure also includes a terminal block disposed above the finger seat. A conductive strip connects the terminal block and the finger seat. Two symmetrical fixing plates are fixed on the terminal block. The fixing plates have downwardly extending extensions. The left and right extensions are respectively connected to the finger seat or the guide cover via connecting rods. The connecting rods on the left and right sides are located in the same radial direction and their axes extend in the left and right direction. One end of the connecting rod is fixed to the finger seat or the guide cover, and the other end is inserted into the extension and rotatably engaged with the extension. Alternatively, one end of the connecting rod is fixed to the extension, and the other end is inserted into the finger seat or the guide cover and rotatably engaged with the finger seat or the guide cover.

[0027] The beneficial effects of the above technical solution are as follows: The stationary contact structure also includes a terminal block disposed above the contact finger seat. A conductive strip connects the terminal block and the contact finger seat, meaning that the terminal block and the contact finger seat are electrically connected. Furthermore, the flexibility of the conductive strip allows relative movement between the terminal block and the contact finger seat. Two symmetrically fixed plates are fixed on the terminal block. The extensions of the fixed plates are connected to the contact finger seat or guide cover via connecting rods. The connecting rods on both sides are located in the same radial direction, and their axes extend in the left-right direction. One end of the connecting rod is fixed, while the other end is inserted and rotated. Therefore, the entire contact finger seat and guide cover can swing back and forth around the connecting rods, or the contact finger seat, guide cover, and connecting rod as a whole can swing back and forth relative to the fixed plates. Thus, when the moving contact is inserted into the guide cover in a swinging posture, the guide cover can change accordingly based on the angle change of the moving contact, adaptively swinging back and forth to cooperate with the insertion of the moving contact, ensuring that the grounding knife rod can perform opening and closing operations smoothly, stably, and accurately. Furthermore, since the positions of the finger seat and guide cover do not need to be fixed and the installation angle does not need to be adjusted, the installation operation can be greatly facilitated and the installation efficiency can be improved.

[0028] Furthermore, the guide cover is fixedly connected to the contact finger seat by multiple fixing screws. The guide cover has multiple screw holes along the circumference, and the contact finger seat has threaded holes that correspond one-to-one with the screw holes.

[0029] The beneficial effect of the above technical solution is that it facilitates the connection and disassembly between the guide cover and the finger seat.

[0030] Furthermore, the connecting rod includes a threaded section and a smooth section. The smooth section is inserted into the extension and rotates with the extension. The threaded section passes through the screw hole and is connected to the corresponding threaded hole.

[0031] The advantages of the above technical solution are: it facilitates the fixed connection between the connecting rod and the finger seat, utilizes the screw holes in the guide cover itself and the threaded holes in the finger seat itself, and does not require additional processing of the fixing structure, which is convenient for manufacturing.

[0032] Furthermore, the connecting rod also includes a screwing part located between the threaded section and the smooth section, which is used to rotate the connecting rod and press it against the guide cover.

[0033] The beneficial effects of the above technical solution are that the screwing part not only facilitates the installation of the connecting rod, but also replaces the fixing screw, ensuring the fixed connection effect between the guide cover and the finger seat.

[0034] Furthermore, a cotter pin is installed on the outside of the extension of the connecting rod.

[0035] The advantages of the above technical solution are: it can prevent the connecting rod from detaching from the fixing plate, and it does not require the connecting rod to be very long, which facilitates processing and installation.

[0036] Furthermore, the fixing plate is L-shaped and includes a horizontal plate segment and a vertical plate segment connected vertically. The horizontal plate segment is fixedly connected to the terminal block, and the extension is composed of the vertical plate segment.

[0037] The advantages of the above technical solution are: simple structure, easy to manufacture and install.

[0038] Furthermore, the horizontal plate segment is fixed to the upper surface of the terminal block by locking screws.

[0039] The beneficial effect of the above technical solution is that it facilitates disassembly and assembly.

[0040] Furthermore, there are two conductive strips arranged symmetrically front to back.

[0041] The beneficial effects of the above technical solution are: it facilitates the overall back-and-forth swing of the finger seat and guide cover, while ensuring the flow capacity.

[0042] Furthermore, the upper end of the conductive strip is fixed to the upper surface of the terminal block by an upper connecting screw, and the lower end of the conductive strip is fixed to the upper surface of the contact finger seat by a lower connecting screw.

[0043] The beneficial effect of the above technical solution is that it facilitates disassembly and assembly. Attached Figure Description

[0044] Figure 1 This is a front sectional view of the stationary contact structure in this invention;

[0045] Figure 2 This is a side view of the stationary contact structure in this invention;

[0046] Figure 3 This is a perspective view of the stationary contact structure in this invention.

[0047] In the diagram: 1. Contact finger seat; 1-1. Large diameter section; 1-2. Medium diameter section; 1-3. Small diameter section; 2. Guide cover; 2-1. Screw hole; 3. Stationary contact finger; 4. Terminal block; 5. Conductive strip; 6. Fixing plate; 7. Connecting rod; 7-1. Smooth rod section; 7-2. Threaded section; 7-3. Tightening part; 8. Cotter pin; 9. Mounting screw; 10. Fixing screw; 11. Locking screw; 12. Upper connecting screw; 13. Lower connecting screw. Detailed Implementation

[0048] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the invention and are not intended to limit the invention; that is, the described embodiments are merely some embodiments of the invention, not all embodiments. The components of the embodiments of the invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0049] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0050] It should be noted that relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any actual relationship or order between these entities or operations. Furthermore, terms such as "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0051] The features and performance of the present invention will be further described in detail below with reference to embodiments.

[0052] An embodiment of the stationary contact structure in this invention is as follows: Figure 1 , Figure 2 and Figure 3As shown, the device includes a finger seat 1 and a guide cover 2 fixed to the outside of the finger seat 1 and having an opening at the bottom. The finger seat 1 is stepped, comprising a large diameter section 1-1, a medium diameter section 1-2, and a small diameter section 1-3 from top to bottom. A stationary finger 3 is installed on the finger seat 1 inside the guide cover 2. Specifically, the stationary finger 3 is fixed to the small diameter section 1-3 of the finger seat 1 by mounting screws 9.

[0053] The top of the guide cover 2 is fitted over the outside of the intermediate diameter section 1-2, and the upper end face of the guide cover 2 abuts against the stepped surface between the large diameter section 1-1 and the intermediate diameter section 1-2. The guide cover 2 is fixedly connected to the intermediate diameter section 1-2 of the contact finger seat 1 by multiple fixing screws 10. Therefore, multiple screw holes 2-1 are provided circumferentially on the guide cover 2, and threaded holes corresponding to the screw holes 2-1 are provided on the intermediate diameter section 1-2. The screw holes 2-1 are U-shaped holes with the opening facing upward.

[0054] The stationary contact structure also includes a terminal block 4 disposed above the contact finger seat 1. A conductive strip 5 is connected between the terminal block 4 and the contact finger seat 1. There are two conductive strips 5 arranged symmetrically front and back. The upper end of the conductive strip 5 is fixed to the upper surface of the terminal block 4 by an upper connecting screw 12, and the lower end of the conductive strip 5 is fixed to the upper surface of the large diameter section 1-1 of the contact finger seat 1 by a lower connecting screw 13.

[0055] Two symmetrical fixing plates 6 are fixed on the terminal block 4. The fixing plates 6 have downward extensions. Specifically, the fixing plates 6 are L-shaped and include a horizontal plate segment and a vertical plate segment connected vertically. The horizontal plate segment is fixed to the upper surface of the terminal block 4 by locking screws 11, and the extension is composed of the vertical plate segment.

[0056] The extensions on the left and right sides are connected to the finger seat 1 via connecting rods 7. The connecting rods 7 on both sides are located in the same radial direction and their axes extend in the left and right direction. Specifically, the connecting rod 7 includes a threaded section 7-2 and a smooth section 7-1. The smooth section 7-1 is inserted into the extension and rotates with it. The threaded section 7-2 passes through the screw hole 2-1 on the guide cover 2 and is connected to the threaded hole on the intermediate diameter section 1-2 to fix it to the finger seat 1. This utilizes the screw hole 2-1 of the guide cover 2 itself and the threaded hole of the finger seat 1 itself, eliminating the need for additional fixing structures and simplifying manufacturing.

[0057] In addition, the connecting rod 7 also includes a screwing part 7-3 located between the threaded section 7-2 and the smooth section 7-1. The screwing part 7-3 is used to rotate the connecting rod 7 and press it against the guide cover 2. The screwing part 7-3 can be an external hexagonal structure, which not only facilitates the installation of the connecting rod 7, but also, since the connecting rod 7 occupies the screw through hole 2-1 and the threaded hole on the middle diameter section 1-2, the connecting rod 7 with the screwing part 7-3 can replace the fixing screw 10, ensuring the fixed connection effect between the guide cover 2 and the contact finger seat 1. Preferably, in order to improve the anti-loosening effect, a washer can also be provided between the screwing part 7-3 and the guide cover 2.

[0058] In addition, such as Figure 1 As shown, a cotter pin 8 is installed on the outer side of the extension of the bare rod section 7-1. This prevents the connecting rod 7 from detaching from the fixing plate 6 and eliminates the need for the connecting rod 7 to be very long, making it convenient for processing and installation.

[0059] During installation, the stationary contact structure of this invention is first loosened by loosening the two uppermost locking screws 11 and the two upper connecting screws 12. After the position is determined, the stationary contact structure is fixed to the valve hall fittings using these four screws. In use, the contact finger seat 1, guide cover 2, and connecting rod 7 can swing back and forth relative to the fixed plate 6 around the axis of the connecting rod 7. Thus, when the moving contact is inserted into the guide cover 2 in a swinging posture, the guide cover 2 can adjust accordingly to the angle change of the moving contact, adaptively swinging back and forth to cooperate with the insertion of the moving contact, ensuring that the grounding knife rod can perform opening and closing operations smoothly, stably, and accurately. Furthermore, since the positions of the contact finger seat 1 and guide cover 2 do not need to be fixed and the installation angle does not need to be adjusted, the installation operation can be greatly simplified, improving installation efficiency.

[0060] In other embodiments of the stationary contact structure: the upper end of the conductive strip can also be fixed to the lower surface of the terminal block; the upper and lower ends of the conductive strip can also be riveted or welded to the terminal block and the contact finger seat.

[0061] In other embodiments of the stationary contact structure: there may be only one conductive strip, and it is not on the front or back side, but is offset to a certain extent.

[0062] In other embodiments of the stationary contact structure: the horizontal section of the fixing plate can also be fixed to the lower surface of the terminal block; the horizontal section of the fixing plate can also be riveted or welded to the terminal block.

[0063] In other embodiments of the stationary contact structure: the fixing plate is not L-shaped; for example, the fixing plate is simply a vertical plate with its upper end fixed to the outer circumferential surface of the terminal block.

[0064] In other embodiments of the stationary contact structure: instead of installing a cotter pin, a resilient retaining ring is installed on the connecting rod, or neither a cotter pin nor a resilient retaining ring is installed. In this case, the connecting rod can be made longer to prevent the connecting rod from detaching from the fixing plate.

[0065] In other embodiments of the stationary contact structure: the screwing part of the connecting rod may also be a square structure, or the connecting rod may not include a separately provided screwing part, but instead the connecting rod is rotated by a smooth rod section.

[0066] In other embodiments of the stationary contact structure: the connecting rod may not include the threaded section and may be entirely smooth. After the connecting rod passes through the screw hole on the guide cover and is inserted into the threaded hole on the contact finger seat, adhesive can be applied to the threaded hole to fix the connecting rod to the contact finger seat.

[0067] In other embodiments of the stationary contact structure: when the connecting rod includes a threaded section and a smooth section, the threaded section can be threadedly connected to the extension of the fixed plate to achieve fixation with the fixed plate, while the smooth section passes through the screw hole on the guide cover and is inserted into the threaded hole on the contact finger seat, and rotates with the threaded hole.

[0068] In other embodiments of the stationary contact structure: regardless of the structure of the connecting rod, the connecting rod may not use the screw holes of the guide cover itself or the threaded holes of the contact finger seat itself, but instead have holes provided on the guide cover and fixing holes or insertion holes machined on the contact finger seat.

[0069] In other embodiments of the stationary contact structure: the guide cover may not be fixedly connected to the contact finger seat by multiple fixing screws, but may be threaded to the contact finger seat or interference fit. In this case, when the connecting rod is fixedly connected to the contact finger seat or inserted into the contact finger seat, a through hole must be machined on the guide cover and a connecting hole must be machined on the contact finger seat.

[0070] In other embodiments of the stationary contact structure: the connecting rod may not be fixedly connected or inserted into the contact finger seat, but rather fixedly connected or inserted into the guide cover. In this case, it is only necessary to machine a fixing hole or insertion hole on the guide cover.

[0071] In other embodiments of the stationary contact structure: the contact finger seat may consist only of a medium diameter section and a small diameter section, in which case the lower end of the guide band is fixedly connected to the medium diameter section.

[0072] The embodiment of the grounding switch in this invention is as follows: The grounding switch includes a moving contact and a stationary contact structure. The specific structure of the stationary contact structure is the same as that of the stationary contact structure in the above embodiment, and will not be repeated here.

[0073] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. The scope of patent protection of the present invention shall be determined by the claims. Similarly, any equivalent structural changes made based on the description and drawings of the present invention shall also be included within the scope of protection of the present invention.

Claims

1. A stationary contact structure, comprising a contact finger seat (1) and a guide cover (2) fixed outside the contact finger seat (1) and having an opening at the bottom, wherein a stationary contact finger (3) is installed on the contact finger seat (1) inside the guide cover (2), characterized in that: The stationary contact structure also includes a terminal block (4) set above the finger seat (1). A conductive strip (5) is connected between the terminal block (4) and the finger seat (1). Two symmetrical fixing plates (6) are fixed on the terminal block (4). The fixing plates (6) have downward extensions. The extensions on the left and right sides are connected to the finger seat (1) or the guide cover (2) by connecting rods (7). The connecting rods (7) on the left and right sides are located in the same radial direction and their axes extend in the left and right directions. One end of the connecting rod (7) is fixed to the finger seat (1) or the guide cover (2), and the other end is inserted into the extension and rotates with the extension. Alternatively, one end of the connecting rod (7) is fixed to the extension and the other end is inserted into the finger seat (1) or the guide cover (2) and rotates with the finger seat (1) or the guide cover (2). There are two conductive strips (5) arranged symmetrically in front and behind. The upper end of the conductive strip (5) is fixed to the upper surface of the terminal block (4) by the upper connecting screw (12), and the lower end of the conductive strip (5) is fixed to the upper surface of the contact finger seat (1) by the lower connecting screw (13).

2. The stationary contact structure according to claim 1, characterized in that: The guide cover (2) is fixedly connected to the finger seat (1) by multiple fixing screws (10). Multiple screw holes (2-1) are provided on the guide cover (2) along the circumferential direction. The finger seat (1) is provided with threaded holes that correspond one-to-one with the screw holes (2-1).

3. The stationary contact structure according to claim 2, characterized in that: The connecting rod (7) includes a threaded section (7-2) and a smooth section (7-1). The smooth section (7-1) is inserted into the extension and rotates with the extension. The threaded section (7-2) passes through the screw hole (2-1) and is connected to the threaded hole.

4. The stationary contact structure according to claim 3, characterized in that: The connecting rod (7) also includes a screwing part (7-3) located between the threaded section (7-2) and the smooth section (7-1), which is used to rotate the connecting rod (7) and press against the guide cover (2).

5. The stationary contact structure according to any one of claims 1 to 4, characterized in that: A cotter pin (8) is installed on the outside of the extension of the connecting rod (7).

6. The stationary contact structure according to any one of claims 1 to 4, characterized in that: The fixing plate (6) is L-shaped and includes a horizontal plate segment and a vertical plate segment connected vertically. The horizontal plate segment is fixedly connected to the wiring plate (4), and the extension is composed of the vertical plate segment.

7. The stationary contact structure according to claim 6, characterized in that: The horizontal plate segment is fixed to the upper surface of the terminal block (4) by locking screws (11).

8. A grounding switch, characterized in that: It includes a moving contact and a stationary contact structure as described in any one of claims 1 to 7.

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