A sealing structure for a horizontal PT switch

Abstract

This utility model relates to the field of power equipment technology, and in particular to a sealing structure for a horizontal PT switch. It includes a sealing isolation side plate, a cover plate, an upper plate, a middle plate, and a bottom plate, forming the main frame of the sealing structure. These components are assembled and connected from top to bottom using screws and positioning posts to form a sealed cavity, providing excellent protection and sealing performance. The operating shaft is installed through the middle plate, with a grounding cam and sealing bushing at its top for axial sealing and grounding circuit control. A limit post is provided to mechanically limit the rotation range of the operating shaft, ensuring operational safety. An aviation socket and a linkage spring reset structure are provided on the upper plate side for electrical connection and elastic reset with an external control system. A microswitch detects the operating status of the mechanism. The bottom plate has mounting posts and a sealing sleeve for equipment fixation and cable sealing. This sealing structure effectively prevents dust and moisture from entering the cavity, improving equipment safety and reliability, and is suitable for high-requirement horizontal PT switch protection applications.

Description

Technical Field

[0001] This utility model relates to the field of power equipment technology, and in particular to a sealing structure for a horizontal PT switch. Background Technology

[0002] Currently, PT switches are widely used in power systems to achieve electrical isolation and measurement control functions on the high-voltage side. With the miniaturization of power equipment and the increasing demand for safety protection, horizontally arranged PT switches are widely adopted due to their compact structure and convenient installation. However, traditional horizontal PT switches still have certain technical bottlenecks in terms of structural sealing, protection performance, and operational reliability.

[0003] Existing PT switch sealing structures often employ simple housing splicing methods, lacking a systematic sealing and isolation design. This makes them susceptible to moisture or impurities entering the switch in outdoor or high-humidity, high-dust environments, thus affecting the electrical performance and lifespan of the equipment. Furthermore, in terms of the operating mechanism, traditional designs often use exposed operating shaft structures with insufficient axial sealing measures. Mechanical wear or external media intrusion during operation can also lead to malfunctions or insulation degradation.

[0004] Regarding grounding control, some devices lack reliable grounding operation baffles or mechanical limit structures, leading to safety hazards such as accidental grounding and accidental closing during switching operations. Particularly during maintenance or operational switching, the lack of an effective interlocking control mechanism prevents safety interlocking, posing a risk of electric shock or equipment damage. Utility Model Content

[0005] The purpose of this invention is to provide a sealing structure for a horizontal PT switch to solve the problems mentioned in the background art.

[0006] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a sealing structure for a horizontal PT switch, including a sealing isolation side plate, a cover plate, an upper plate, a middle plate and a bottom plate. The sealing isolation side plate and the cover plate form the side and top protective parts of the structural shell. The upper plate, the middle plate and the bottom plate are stacked vertically in sequence and connected and fixed by screws and positioning pins to form a three-dimensional sealed cavity structure.

[0007] According to the above technical solution, the cover plate is a top cover assembly, and a lower door interlocking structure is provided on the cover plate. The lower door interlocking structure includes an interlocking shim block and an interlocking rod. The interlocking shim block is fixed to the middle of the interlocking rod by screws and is used to adjust the installation height of the interlocking rod and its engagement position with other mechanisms.

[0008] According to the above technical solution, the operating shaft is installed through the middle plate from the bottom plate, and a grounding cam and a sealing bushing are arranged in sequence at its top end. The grounding cam is used to drive the grounding operation baffle set at one end of the operating shaft to realize the switching of the grounding circuit. The sealing bushing is set between the operating shaft and the cover plate through hole to form an axial sealing structure, which effectively prevents dust and moisture from entering the cavity.

[0009] According to the above technical solution, the grounding operation baffle is connected to the grounding cam and moves with the rotation of the operating shaft to realize the interlocking control function of the equipment in the power failure grounding or maintenance state.

[0010] According to the above technical solution, a limiting post is provided between the middle plate and the upper plate. One end of the limiting post is fixed to the structural component, and the other end extends into the rotation path of the operating shaft. When the operating shaft rotates to a set angle, it provides physical limitation to prevent excessive rotation or misoperation. The limiting post can be made of high-strength insulating material with good mechanical strength and wear resistance.

[0011] According to the above technical solution, a 14-pin aviation socket is also installed on one side of the upper plate for connecting external signal cables to realize remote monitoring and control of switch status or grounding position.

[0012] According to the above technical solution, the structure may be further provided with a spring reset mechanism, including a spring fixing sleeve, a spring pull rod push shaft and a spring sleeve fixing shaft.

[0013] Compared with the prior art, the beneficial effects achieved by this utility model are:

[0014] This utility model features a three-dimensional sealed cavity formed by a sealing and isolating side plate, a cover plate, an upper plate, a middle plate, and a bottom plate, which effectively improves the overall structure's protective and sealing performance. Furthermore, the grounding cam and grounding operation baffle on the operating shaft enable reliable on / off control of the grounding circuit, ensuring the safety of personnel and equipment during operation.

[0015] The axial sealing of the operating shaft through the plate is achieved by a sealing bushing, preventing dust and moisture from entering the cavity, making it suitable for outdoor or high-humidity environments. A limit post physically limits the rotation range of the operating shaft, preventing misoperation or damage and improving mechanical reliability. The lower door interlocking pad and interlocking rod facilitate interlocking protection with external doors, enhancing linkage safety. Furthermore, the structure can integrate a 14-pin aviation socket, a spring reset mechanism, and a microswitch detection component, facilitating external system access and status monitoring, and enhancing the overall intelligence and maintainability of the system. Attached Figure Description

[0016] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0017] Figure 1 This is a schematic diagram of the overall structure of a sealing structure for a horizontal PT switch proposed in this utility model;

[0018] Figure 2 This is a schematic diagram of a sealing structure for a horizontal PT switch proposed in this utility model, with the sealing isolation side plate removed;

[0019] Figure 3 This is a schematic diagram of another angle of the sealing structure of a horizontal PT switch proposed in this utility model, with the sealing isolation side plate removed;

[0020] Figure 4 This is a front view of a sealing structure for a horizontal PT switch proposed in this utility model.

[0021] In the diagram: 1. Sealed isolation side plate;

[0022] 2. Cover plate, 21. Lower door interlocking pad, 22. Lower door interlocking rod, 23. Mechanism main shaft, 24. Grounding cam, 25. Sealing bushing, 26. Grounding operation baffle;

[0023] 3. Top plate, 31. Aviation socket, 32. Spring retaining sleeve, 33. Spring pull rod push shaft, 34. Spring sleeve retaining shaft, 35. Micro switch;

[0024] 4. Middle plate, 41. Operating shaft, 42. Limiting post;

[0025] 5. Base plate, 51. Base plate mounting column, 52. Sealing sleeve. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] Example:

[0028] Reference Figure 1-4 A sealing structure for a horizontal PT switch includes a sealing isolation side plate 1, a cover plate 2, an upper plate 3, a middle plate 4, and a bottom plate 5, which constitute the main frame of the sealing structure. They are assembled from top to bottom and connected and fixed by screws, positioning pins, etc., to form a cavity structure with excellent protection and sealing performance.

[0029] The sealing isolation side plate 1 and the cover plate 2 form the top and side protective structures of the structural shell, which, together with the middle plate 4, bottom plate 5 and upper plate 3, constitute a three-dimensional sealed cavity. The cover plate 2 is the top covering component, and a lower door interlocking structure is installed on top of it, including a lower door interlocking shim 21 and a lower door interlocking rod 22. The interlocking shim 21 is fixed to the middle of the lower door interlocking rod 22 by screws, and is used to adjust the installation height and operating position of the interlocking rod.

[0030] The bottom of the operating shaft 41 passes through the middle plate 4 and is installed between the bottom plate 5 and the middle plate 4. A grounding cam 24 and a sealing bushing 25 are fitted around its top outer periphery. The grounding cam 24 is used to drive the grounding operation baffle 26 to realize the on / off control of the grounding circuit. The sealing bushing 25 is fitted between the operating shaft 41 and the through hole of the cover plate 2 to form an axial sealing structure to prevent dust or moisture from entering the cavity along the main shaft.

[0031] The grounding operation baffle 26 is located at one end of the operation shaft 41 and rotates with the operation shaft 41 to complete the grounding control action. It is used for safety interlocking control in the power outage grounding or maintenance state.

[0032] A limiting post 42 is installed between the middle plate 4 and the upper plate 3 to mechanically limit the rotation range of the operating shaft 41. One end is fixed to the structural component, and the other end extends into the rotation path of the operating shaft 41. When the operating shaft rotates to a set angle, the limiting post 42 provides physical obstruction to prevent excessive rotation or reverse rotation from causing damage or malfunction of the mechanism. The limiting post can be made of high-strength insulating material, possessing certain mechanical strength and wear resistance to ensure limiting accuracy and reliability during long-term use.

[0033] A 14-pin aviation socket 31 is provided on one side of the upper plate 3 for connecting to external signal control cables. The socket is installed in the fixing hole between the upper plate 3 and the cover plate 2 by screws, and its structure facilitates maintenance and replacement. Below the aviation socket 31, there is a spring retaining sleeve 32, a spring pull rod push shaft 33, and a spring sleeve fixing shaft 34, which constitute a spring reset structure. The spring pull rod push shaft 33 is connected to the operating shaft 41 and is stretched or compressed during the rotation of the operating shaft to achieve elastic energy storage and reset control. The spring retaining sleeve 32 is used to constrain the direction of spring deformation and cooperates with the spring sleeve fixing shaft 34 to maintain the axial stability of the overall structure and avoid misalignment caused by vibration or accidental collision.

[0034] A micro switch 35 is installed inside the upper plate 3 and is linked to the main shaft 23 of the mechanism to detect the position of the mechanism or to provide feedback on the status signal of the mechanism. The main shaft 23 of the mechanism is the core linkage shaft of this structure, connecting the main shaft 23 of the mechanism to the external handle and providing operation input.

[0035] The base plate 5 serves as the foundation of the structure, and it is equipped with base plate mounting posts 51 for fixing the overall sealing structure to the equipment frame. The sealing sleeve 52 is fitted around the cable through hole of the base plate to seal the cable or shaft exit at the bottom and enhance the overall airtightness.

[0036] When using this sealing structure, the entire sealing structure needs to be connected and fixed to the equipment body or cabinet through the base plate 5 to ensure that the sealing isolation side plate 1, cover plate 2, upper plate 3, middle plate 4 and base plate 5 are tightly sealed. The plates are connected by screws and sealing gaskets are set to form an operating cavity with good airtightness.

[0037] The aviation socket 31 is used to connect to an external control system to transmit electrical signals. Before closing or disconnecting the PT circuit, the operator can input action commands to the operating shaft 41 through the control system or manual mechanism. If the system is in a "grounded" state, the grounding operation baffle 26 is kept closed by the grounding cam 24 to prevent the system from being powered on. The operating shaft 41 starts to rotate under external drive, and the grounding cam 24 rotates synchronously and drives the grounding operation baffle 26 to move, realizing the opening or closing of the grounding state. If the preset limit angle is reached, the limit post 42 will physically block the operating shaft 41 to prevent overtravel rotation or reverse malfunction, ensuring operational safety. At the same time, the sealing bushing 25 continuously provides a good axial seal during the rotation of the operating shaft to prevent dust and moisture from entering the cavity. If the outer shell door is opened, the interlocking rod 22 and the interlocking shim 21 will shift, which can trigger the protection action through the main shaft of the mechanism or the micro switch 35 to cut off the control circuit and prevent malfunction under power. The signal line connected to the 14-pin aviation socket 31 can transmit the operating status (such as grounding completed, position reached, door status, etc.) back to the monitoring system for remote monitoring and secondary protection logic. After the operation is completed, the operating axis returns to its original position, and the grounding baffle resets. The cover 2 closes, all sealing structures remain intact, and the equipment returns to a safe sealed standby state.

[0038] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "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 process, method, article, or apparatus.

[0039] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A sealing structure for a horizontal PT switch, characterized in that, include: The sealing isolation side plate (1), cover plate (2), upper plate (3), middle plate (4) and bottom plate (5) are assembled from top to bottom in sequence and connected by screws and positioning pins to form a sealed cavity structure; The bottom end of the operating shaft (41) passes through the middle plate (4) and is installed between the middle plate (4) and the bottom plate (5). Its top end is provided with a grounding cam (24) and a sealing bushing (25). The sealing bushing (25) is fitted between the operating shaft (41) and the through hole on the cover plate (2); The grounding cam (24) is connected to the grounding operation baffle (26), and the operation shaft (41) rotates to drive the grounding operation baffle (26) to realize the on / off control of the grounding circuit; A limit post (42) is provided between the middle plate (4) and the upper plate (3), and the limit post (42) is located within the rotation path of the operating shaft (41); The cover plate (2) is equipped with a lower door interlocking structure, including an interlocking shim (21) and an interlocking rod (22). The interlocking shim (21) is fixed to the middle of the interlocking rod (22) by screws, and is used to adjust the height and position of the interlocking rod (22).

2. The sealing structure for a horizontal PT switch according to claim 1, characterized in that: The limiting post (42) is fixed to the structural member, with one end extending into the rotation path of the operating shaft (41) to provide mechanical obstruction when the operating shaft (41) rotates to a set angle.

3. The sealing structure for a horizontal PT switch according to claim 1, characterized in that: A 14-pin aviation socket (31) is provided on one side of the upper plate (3) for electrical connection with external signal control cables. The aviation socket (31) is fixedly installed on the upper plate (3) by screws.

4. The sealing structure for a horizontal PT switch according to claim 1, characterized in that: The grounding operation baffle (26) rotates together with the operation shaft (41) to complete the control operation of grounding or disconnecting the grounding, and to realize the safety lock of the equipment in the maintenance state.

5. The sealing structure for a horizontal PT switch according to claim 1, characterized in that: A spring reset mechanism is provided inside the upper plate (3).

6. The sealing structure for a horizontal PT switch according to claim 5, characterized in that: The spring reset mechanism includes a spring retaining sleeve (32), a spring pull rod push shaft (33), and a spring sleeve retaining shaft (34).

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