Permanent magnet switch overtravel adjusting structure and device

Abstract

The utility model discloses a permanent magnet switch over-travel adjusting structure and device. The permanent magnet switch over-travel adjusting structure comprises a permanent magnet switch body, an over-travel adjusting piece and an over-travel locking assembly. The permanent magnet switch main body comprises a contact spring, an insulating pull rod, a screw rod and an iron core, the contact spring is installed in the insulating pull rod, the lower end of the insulating pull rod is provided with a first inner threaded hole matched with the screw rod, the lower end of the insulating pull rod is connected with the upper end of the screw rod through the first inner threaded hole, and the over-travel adjusting piece is provided with an inner threaded through hole matched with the screw rod. The lower end of the screw rod sequentially penetrates through the internal thread through hole and the iron core and is in threaded connection with the over-travel locking assembly; the lower end face of the over-travel adjusting piece and the upper end face of the over-travel locking assembly abut against the iron core, the scientific principle that the contact spring and the over-travel adjusting piece are spatially separated can be achieved, and therefore the over-travel adjusting device can be directly applied to a high-speed switch under the condition that no part needs to be additionally arranged, and the over-travel adjusting range is effectively enlarged.

Description

Technical Field

[0001] This utility model relates to the field of medium-voltage switchgear for power, and in particular to a permanent magnet switch overtravel adjustment structure and device. Background Technology

[0002] In the field of permanent magnet medium-voltage switches, based on different permanent magnet mechanism layouts, they are divided into two types: linkage type and direct-drive type. The overtravel adjustment of linkage-type switches is the same as that of traditional spring-operated switches. However, for direct-drive permanent magnet switches, the permanent magnet mechanism is directly installed below the pole post. Due to the very small longitudinal space below the pole post, the permanent magnet mechanism occupies a large space, making it almost impossible to adjust the overtravel using conventional methods. Currently, for this type of switch, the only existing technology offers the following solution: This solution integrates the overtravel spring from the traditional insulated pull rod into the permanent magnet mechanism, with the overtravel adjustment nut located at the bottom of the mechanism. By adjusting this nut, the position of the moving contact can be adjusted, thereby adjusting the overtravel distance. However, this solution has many limitations in terms of reliability; it cannot be applied to fast switching, nor can it achieve a wide range of adjustable overtravel. Utility Model Content

[0003] The purpose of this invention is to solve the technical problems that existing direct-drive permanent magnet switches cannot be applied to fast switching and cannot achieve a wide range of adjustable overtravel, and to propose a permanent magnet switch overtravel adjustment structure and device.

[0004] The technical problem of this utility model is solved by the following technical solution:

[0005] A permanent magnet switch overtravel adjustment structure includes a permanent magnet switch body, an overtravel adjustment component, and an overtravel locking assembly. The permanent magnet switch body includes a contact spring, an insulating pull rod, a screw, and an iron core. The contact spring is installed inside the insulating pull rod. The lower end of the insulating pull rod is provided with a first internal threaded hole adapted to the screw. The lower end of the insulating pull rod is connected to the upper end of the screw through the first internal threaded hole. The overtravel adjustment component is provided with an internal threaded through hole adapted to the screw. The lower end of the screw passes through the internal threaded through hole and the iron core in sequence, and is threadedly connected to the overtravel locking assembly. The lower end face of the overtravel adjustment component and the upper end face of the overtravel locking assembly both abut against the iron core. The overtravel adjustment component is used to adjust the relative height between the insulating pull rod and the iron core. The overtravel locking assembly is used to cooperate with the overtravel adjustment component to lock the iron core onto the screw, so that when the permanent magnet switch is working, the iron core drives the insulating pull rod to move up and down.

[0006] In some embodiments, the following technical features are also included:

[0007] The overtravel adjustment component includes an overtravel adjustment component body, the lower end of which is provided with a toothed portion, and at least two slots are evenly distributed on the toothed portion for engaging with a wrench.

[0008] In some embodiments, the overtravel adjustment element body is cylindrical in shape and made of stainless steel.

[0009] In some embodiments, the overtravel locking assembly includes an overtravel locking nut, a spring washer, and a flat washer. The upper end face of the flat washer abuts against the iron core. The screw passes through the overtravel adjusting member, the iron core, the flat washer, and the spring washer in sequence and is connected to the overtravel locking nut.

[0010] In some embodiments, the overtravel locking assembly includes an overtravel locking screw, a spring washer, and a flat washer connected in sequence. The lower end of the screw is provided with a second internal threaded hole adapted to the overtravel locking screw. The upper end face of the flat washer abuts against the iron core. The overtravel locking screw is threadedly connected to the screw through the second internal threaded hole.

[0011] The technical problem of this utility model is also solved by the following technical solution:

[0012] A permanent magnet switch overtravel adjustment device includes the permanent magnet switch overtravel adjustment structure as described above, and an overtravel adjustment wrench. One end of the overtravel adjustment wrench is configured as a tubular structure that matches the screw, and the bottom of the tubular structure is provided with a meshing part that matches the toothed part.

[0013] The beneficial effects of this utility model compared with the prior art include:

[0014] This utility model proposes a permanent magnet switch overtravel adjustment structure and device. The structure features a contact spring installed inside an insulating pull rod, a screw with its lower end passing sequentially through the internal threaded hole of the overtravel adjustment component and the iron core, and a threaded connection to the overtravel locking assembly. Both the lower end face of the overtravel adjustment component and the upper end face of the overtravel locking assembly abut against the iron core. These features enable the scientific principle of spatial separation between the contact spring and the overtravel adjustment component, thus ensuring that the preset contact pressure is not affected during overtravel adjustment. Furthermore, the relative height between the overtravel adjustment component and the screw can be adjusted within the permanent magnet switch. This solves the technical problems of existing direct-drive permanent magnet switches, allowing direct application to fast switches without adding components, effectively increasing the overtravel adjustment range, and extending the service life of the permanent magnet switch.

[0015] In addition, some embodiments also have the following beneficial effects:

[0016] By incorporating technical features such as overtravel locking nuts, spring washers, and flat washers, the overtravel adjustment component can be securely fastened to the overtravel locking nuts, spring washers, and flat washers, ensuring both overtravel adjustment and reliable fastening of the permanent magnet switch overtravel adjustment structure.

[0017] Other beneficial effects of the embodiments of this utility model will be further described below. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the permanent magnet switch overtravel adjustment structure in an embodiment of this utility model;

[0019] Figure 2 This is a schematic diagram of the permanent magnet switch performing overtravel adjustment in an embodiment of this utility model;

[0020] Figure 3 This is a perspective view of the overtravel nut in an embodiment of this utility model;

[0021] Figure 4 This is a front view of the overtravel nut in an embodiment of this utility model;

[0022] Figure 5 yes Figure 4 AA-line cross-section;

[0023] Figure 6 This is a perspective view of the overtravel adjustment wrench in an embodiment of this utility model;

[0024] Figure 7 This is a side view of the overtravel adjustment wrench in an embodiment of this utility model;

[0025] Figure 8 yes Figure 7 BB line cross-section;

[0026] Figure 9 This is a schematic diagram of another permanent magnet switch overtravel adjustment structure in an embodiment of this utility model;

[0027] Figure label:

[0028] 1. Contact spring; 2. Insulating pull rod; 3. Screw; 4. Iron core; 5. Overtravel adjustment component; 501. Internal threaded through hole; 502. Overtravel adjustment component body; 503. Toothed part; 504. Groove; 6. Overtravel locking nut; 7. Spring washer; 8. Flat washer; 9. Overtravel adjustment wrench; 901. Tubular structure; 902. Engaging part; 10. Overtravel locking screw; 11. Solid sealing post; 12. Moving contact. Detailed Implementation

[0029] The embodiments of this utility model are described in detail below. It should be emphasized that the following description is merely exemplary and not intended to limit the scope and application of this utility model.

[0030] It should be noted that when a component is referred to as "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as "connected to" another component, it can be directly connected to or indirectly connected to that other component. Furthermore, a connection can be used for fixing, coupling, or communication.

[0031] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0032] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of embodiments of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0033] Before introducing the embodiments of this utility model, the concept of this utility model is first described as follows: Because the adjusting nut in the existing direct-drive permanent magnet switch cannot be fitted with a spring washer, a self-locking nut must be used. However, self-locking nuts have many limitations in terms of reliability. While they work under low impact conditions, if the impact force is large, the reliability of the nut's locking cannot be guaranteed. Therefore, the current solution for this type of switch uses a specially made vacuum bulb with low contact pressure (approximately 2000N) to reduce the impact force on the permanent magnet mechanism. These vacuum bulbs are expensive, and their short-circuit breaking current can only reach 31.5KA, not 40KA (40KA requires even higher contact pressure). Furthermore, this solution cannot be applied to fast switches because fast switches have a greater impact force. This solution adjusts the overtravel while changing the preload of the overtravel spring, thus limiting the overtravel adjustment range. Otherwise, large fluctuations in the overtravel spring would affect the preset contact pressure. In existing technologies, the contact spring is installed inside the mechanism. The overtravel adjustment in these technologies utilizes the preload of the contact spring and the tightening of the self-locking nut. When the self-locking nut is turned in the tightening direction, the insulating rod moves downward, increasing the preload of the contact spring; conversely, when adjusted in the reverse direction, the preload of the contact spring decreases. If the existing technology does not use a contact spring in conjunction with a self-locking nut, the height of the self-locking nut cannot be adjusted, and therefore, overtravel adjustment is impossible. The contact pressure during overtravel has a significant impact on permanent magnet switches, mainly in the following aspects:

[0034] (1) Ensure good contact of the contacts: The existence of overtravel increases the final pressure of the contacts when they are not worn. In this way, even if the contacts are severely worn or vibrating, a certain final pressure can still be maintained, thus ensuring good contact of the contacts.

[0035] (2) Reduce bounce and arcing time: When the contacts are closed, the contact spring force is used to buffer the bounce. When the contacts are open, the overtravel gives the moving contact a certain initial kinetic energy, which helps to break the weld joint, increase the initial opening speed, thereby reducing the arcing time and increasing the medium recovery speed.

[0036] (3) Factors affecting the electrical life of permanent magnet switches: Overtravel and final contact pressure are among the important factors determining the electrical life of permanent magnet switches. The existence of overtravel increases the final pressure of the contacts before wear, which helps to extend the service life of permanent magnet switches.

[0037] This utility model embodiment provides a permanent magnet switch overtravel adjustment structure, such as Figure 1As shown, the device includes a permanent magnet switch body, an overtravel adjustment component 5, and an overtravel locking assembly. The permanent magnet switch body includes a solid-sealed pole post 11, a contact spring 1, an insulating pull rod 2, a screw 3, and an iron core 4. A vacuum interrupter chamber is provided inside the solid-sealed pole post 11, containing a stationary contact and a moving contact 12. The moving contact 12 is connected to the insulating pull rod 2. The contact spring 1 is installed inside the insulating pull rod 2. The lower end of the insulating pull rod 2 has a first internal threaded hole adapted to the screw 3. The lower end of the insulating pull rod 2 is connected to the upper end of the screw 3 through the first internal threaded hole. The overtravel... The adjusting component 5 is provided with an internal threaded through hole 501 adapted to the screw 3. The lower end of the screw 3 passes through the internal threaded through hole 501 of the overtravel adjusting component 5 and the iron core 4 in sequence, and is threadedly connected to the overtravel locking assembly. The lower end face of the overtravel adjusting component 5 and the upper end face of the overtravel locking assembly both abut against the iron core 4. The overtravel adjusting component 5 is used to adjust the relative height between the iron core 4 and the screw 3. The overtravel locking assembly is used to cooperate with the overtravel adjusting component 5 to lock the iron core 4 onto the screw 3, so that when the permanent magnet switch is working, the iron core 4 drives the insulating pull rod 2 to move up and down.

[0038] In one specific embodiment, such as Figures 3-5 As shown, the overtravel adjustment component 5 includes an overtravel adjustment component body 502. A toothed portion 503 is provided at the lower end of the overtravel adjustment component body 502. At least two slots 504 are evenly distributed on the toothed portion 503 for engaging with a wrench. Preferably, the overtravel adjustment component body 502 is cylindrical and made of stainless steel.

[0039] In a preferred embodiment, the overtravel locking assembly includes an overtravel locking nut 6, a spring washer 7, and a flat washer 8. The upper end face of the flat washer 8 abuts against the iron core 4. The screw 3 passes through the overtravel adjusting member 5, the iron core 4, the flat washer 8, and the spring washer 7 in sequence and is connected to the overtravel locking nut 6.

[0040] In another preferred embodiment, such as Figure 9 As shown, by changing the screw 3 to a screw 3 with external threads on the outside and a threaded hole on the inside of the bottom, and by changing the original method of using an overtravel locking nut 6 at the bottom to using an overtravel locking screw 10, the purpose of overtravel adjustment and locking can be achieved. The specific scheme is as follows: The overtravel locking assembly includes an overtravel locking screw 10, a spring washer 7, and a flat washer 8 connected in sequence. The lower end of the screw 3 is provided with a second internal threaded hole that is compatible with the overtravel locking screw 10. The upper end face of the flat washer abuts against the iron core 4. The overtravel locking screw 10 is threadedly connected to the screw 3 through the second internal threaded hole.

[0041] This utility model embodiment also provides a permanent magnet switch overtravel adjustment device, such as Figure 2 As shown, it includes the permanent magnet switch overtravel adjustment structure in the above embodiment, and an overtravel adjustment wrench 9. One end of the overtravel adjustment wrench 9 is configured as a tubular structure 901 that matches the screw 3, as shown. Figures 6-8As shown, the bottom of the tubular structure 901 is provided with a meshing part 902 that matches the toothed part 503, so that the overtravel adjustment wrench 9 can pass through the iron core 4 along the lower end of the screw 3 and mesh with the toothed part 503 at the lower end of the overtravel adjustment member 5.

[0042] This utility model provides a permanent magnet switch overtravel adjustment structure. The contact spring 1 is installed inside the insulating rod 2, independent of the adjusting nut; thus increasing the overtravel adjustment range without affecting the preset contact pressure. This ensures both a wide range of overtravel adjustment and reliable fastening. The specific solution provided in this embodiment is as follows: the contact spring 1 is installed inside the insulating rod 2, and a screw 3 is installed at the bottom of the insulating rod 2. The screw 3 passes through the entire permanent magnet switch mechanism, and its lower end passes through the iron core 4 (T-shaped). The red part on the screw 3 is a screw tube, and the inner hole of the screw 3 is a threaded hole. The bottom of the screw 3 has an overtravel locking nut 6, a spring washer 7, and a flat washer 8. After the insulating rod 2 and the iron core 4 are fastened together, they form a single unit. During normal operation, the iron core 4 moves up and down due to electromagnetic force, driving the insulating rod 2 to move up and down. For example, if the iron core 4 moves upward by 12mm, the insulating rod 2 also moves upward by 12mm. Since the distance between the moving contact 12 and the stationary contact in the vacuum bulb connected to the uppermost end of the insulating rod 2 is set to 9mm after being adjusted by the overtravel adjustment screw, the moving contact 12 will contact the stationary contact after the iron core 4 moves upward by 9mm. At this time, due to the contact spring 1 between the moving contact 12 and the upper end of the insulating rod 2, the iron core 4 and the insulating rod 2 will continue to move until 12mm. The contact spring 1 will be compressed by 3mm. This 3mm is the overtravel of the circuit breaker.

[0043] The specific operation process for overtravel adjustment is as follows:

[0044] Remove the bottom overtravel locking nut 6, spring washer 7, and flat washer 8. Use a special overtravel adjustment wrench 9 to reach the top of the iron core 4 and rotate it to the overtravel adjustment component 5. By rotating the overtravel adjustment component 5, you can adjust the height of the overtravel adjustment component 5, which means adjusting the relative height between the insulating pull rod 2 and the iron core 4. This allows you to adjust the distance between the moving contact 12 and the stationary contact. This is the overtravel adjustment process.

[0045] In another preferred embodiment, the overtravel adjustment component 5 is a stainless steel cylinder with a threaded inner hole that mates with the connecting screw 3 of the insulating pull rod 2. The lower end has a protrusion with three evenly distributed 60° slots 504. These slots 504 can be engaged with a special tool to form a simple wrench-like structure. The tool is used to rotate and adjust the overtravel adjustment component 5, thus achieving the purpose of overtravel adjustment. The lower end of the insulating pull rod 2 is equipped with an overtravel locking nut 6, a spring washer 7, and a flat washer 8. After the overtravel adjustment is complete, the overtravel locking nut 6, spring washer 7, and flat washer 8 can be installed. At this time, the overtravel adjustment component 5 is clamped tightly with the lower overtravel locking nut 6, spring washer 7, and flat washer 8, ensuring both reliable fastening and overtravel adjustment.

[0046] Compared with the prior art, the embodiments of this utility model have the following advantages:

[0047] 1. In this embodiment of the utility model, the overtravel nut adjustment, which previously had no operating space, is extended into the operating space through tooth meshing;

[0048] 2. In the overtravel adjustment method of this utility model embodiment, the nut that cannot be operated inside is extended into the bottom operable space through tooth meshing.

[0049] The above description, in conjunction with specific / preferred embodiments, provides a further detailed explanation of the present invention and should not be construed as limiting the specific implementation of the present invention to these descriptions. For those skilled in the art, various substitutions or modifications can be made to these described embodiments without departing from the concept of the present invention, and all such substitutions or modifications should be considered within the protection scope of the present invention. In the description of this specification, the reference to terms such as "an embodiment," "some embodiments," "preferred embodiment," "example," "specific example," or "some examples," etc., indicates that the specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the described specific features, structures, materials, or characteristics can be combined in a suitable manner in any one or more embodiments or examples. Without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification and the features of different embodiments or examples. Although embodiments of the present invention and their advantages have been described in detail, it should be understood that various changes, substitutions and alterations may be made herein without departing from the scope of protection of the patent application.

Claims

1. A permanent magnet switch overtravel adjustment structure, characterized by: The permanent magnet switch body, over-travel adjusting member, over-travel locking assembly; the permanent magnet switch body includes contact spring, insulating pull rod, screw rod, iron core, the contact spring is installed in the insulating pull rod, the lower end of the insulating pull rod is provided with the first internal thread hole compatible with the screw rod, the lower end of the insulating pull rod is connected with the upper end of the screw rod through the first internal thread hole, the over-travel adjusting member is provided with the internal thread through hole compatible with the screw rod, the lower end of the screw rod sequentially passes through the internal thread through hole, the iron core, and is threadedly connected with the over-travel locking assembly; the lower end surface of the over-travel adjusting member and the upper end surface of the over-travel locking assembly are in abutment with the iron core, the over-travel adjusting member is used for adjusting the relative height of the insulating pull rod and the iron core, and the over-travel locking assembly is used for locking the iron core on the screw rod in cooperation with the over-travel adjusting member, so that when the permanent magnet switch works, the insulating pull rod is driven by the iron core to move up and down.

2. The permanent magnet switch overtravel adjustment structure as described in claim 1, characterized in that: The over-travel adjusting member includes an over-travel adjusting member body, and the lower end of the over-travel adjusting member body is provided with a toothed portion, and at least two notches are uniformly distributed on the toothed portion and used for engaging with a wrench.

3. The permanent magnet switch overtravel adjustment structure as described in claim 2, characterized in that: The shape of the over-travel adjusting member body is cylindrical, and the over-travel adjusting member body is made of stainless steel.

4. The permanent magnet switch overtravel adjustment structure as described in claim 1, characterized in that: The over-travel locking assembly includes an over-travel locking nut, a spring pad and a flat pad, the upper end surface of the flat pad is in abutment with the iron core, the screw rod sequentially passes through the over-travel adjusting member, the iron core, the flat pad and the spring pad, and is connected with the over-travel locking nut.

5. The permanent magnet switch overtravel adjustment structure as described in claim 1, characterized in that: The over-travel locking assembly includes an over-travel locking screw, a spring pad and a flat pad connected in sequence, the lower end of the screw rod is provided with a second internal thread hole compatible with the over-travel locking screw, the upper end surface of the flat pad is in abutment with the iron core, and the over-travel locking screw is threadedly connected with the screw rod through the second internal thread hole.

6. An apparatus, characterized by: The permanent magnet switch over-travel adjusting structure includes the permanent magnet switch over-travel adjusting structure according to any one of claims 1-5, and an over-travel adjusting wrench, one end of the over-travel adjusting wrench is provided as a tubular structure matched with the screw rod, and the bottom of the tubular structure is provided with an engaging portion matched with the toothed portion.

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