Anti-twisting mechanism, vacuum arc-extinguishing chamber and vacuum circuit breaker

Abstract

The utility model provides an anti-twisting mechanism which comprises a guide sleeve, the guide sleeve comprises a roughly annular mounting part, the mounting part comprises a circular outer peripheral wall arranged on the radial outer side, the guide sleeve is provided with a circular inner hole wall forming an inner through hole penetrating through the guide sleeve in the axial direction, and the inner hole wall and the outer peripheral wall are coaxial. A key extending in the axial direction is arranged on the wall of the inner hole, and an open groove which is concaved inwards in the radial direction from the peripheral wall and extends in the axial direction is formed in the installation part. The fixing ring is arranged on the periphery of the peripheral wall in a sleeving mode, the fixing ring is provided with a protruding part which extends in the axial direction and is matched with the open groove, and the protruding part extends into the open groove and can abut against the open groove on the two sides in the circumferential direction; the conducting rod is installed in the inner through hole of the guide sleeve, the conducting rod is matched with the inner through hole in shape, a containing groove matched with the key is formed in the periphery of the conducting rod, and the key extends into the containing groove and can abut against the containing groove on the two sides in the circumferential direction. The utility model also provides a vacuum arc-extinguishing chamber and a vacuum circuit breaker comprising the anti-twisting mechanism.

Description

Technical Field

[0001] The present disclosure relates to the electrical field, and in particular to an anti-twist mechanism, a vacuum interrupter including the anti-twist mechanism, and a vacuum circuit breaker including the anti-twist mechanism or the vacuum interrupter. Background Art

[0002] The arc-extinguishing medium and the insulating medium in the contact gap after arc extinguishing in vacuum circuit breakers are both high vacuum. They are compact, lightweight, suitable for frequent operation, and require no maintenance during arc extinguishing, making them widely used in distribution networks. The vacuum interrupter is the core component of a vacuum circuit breaker and consists primarily of an airtight insulating casing, conductive circuit, shielding system, contacts, bellows, and conductive rods.

[0003] The operating mechanism closes the moving and stationary contacts through the axial movement of the conductive rod, completing the circuit connection. To minimize and stabilize the contact resistance between the two contacts and ensure good mechanical strength for the arc extinguishing chamber when subjected to dynamic and steady-state current, the vacuum switch can be equipped with a guide sleeve at one end of the conductive rod and a set of compression springs to maintain a rated pressure between the two contacts. When the vacuum switch interrupts the current, the two contacts in the arc extinguishing chamber separate, generating an arc between them. The arc extinguishes when the current naturally crosses zero, thus breaking the circuit.

[0004] The vacuum interrupter can be equipped with an anti-twist structure to prevent the bellows from twisting when the vacuum interrupter is assembled on the vacuum circuit breaker. Current anti-twist structures primarily consist of a conductive rod, a guide sleeve, a retaining ring, and a cap that secures the guide sleeve and retaining ring. However, structures with good anti-twist effects come with high processing costs. Solutions with lower processing costs often offer poor anti-twist effects.

[0005] Therefore, a twist-proof structure with low processing cost and good twist-proof effect is needed. Utility Model Content

[0006] The object of the present disclosure is to at least solve the drawbacks existing in the prior art. The present disclosure provides a torsion prevention mechanism, which includes a guide sleeve. The guide sleeve includes a mounting portion having a substantially annular shape. The mounting portion includes a circular outer peripheral wall provided on the radially outer side. The guide sleeve has a circular inner hole wall forming an inner through hole that axially penetrates the guide sleeve. The inner hole wall is coaxial with the outer peripheral wall. A key extending axially is provided on the inner hole wall. A slot that radially indents inward from the outer peripheral wall and extends axially is provided on the mounting portion. A fixing ring is sleeved around the outer peripheral wall. The fixing ring is provided with a protruding portion extending axially and cooperating with the slot. The protruding portion extends into the slot and can abut against the slot on both sides in the circumferential direction. A conductive rod is made of a conductive material and installed in the inner through hole of the guide sleeve. The shape of the conductive rod is adapted to the shape of the inner through hole. A receiving groove cooperating with the key is provided on the outer periphery of the conductive rod. The key extends into the receiving groove and can abut against the receiving groove on both sides in the circumferential direction.

[0007] For example, according to some embodiments of the present disclosure, the guide sleeve further includes a plurality of snap portions provided on the mounting portion and at least partially extending axially. The free end of the snap portion radially protrudes from the outer peripheral wall. The fixing ring is provided with a snap groove that radially penetrates the fixing ring and cooperates with the free end of the snap portion. The free end extends into the snap groove, so that the free end can abut against the snap groove in the axial direction.

[0008] For example, according to some embodiments of the present disclosure, a gap is provided between the snap portion and the mounting portion in the radial direction.

[0009] For example, according to some embodiments of the present disclosure, the guide sleeve includes an annular base adjacent to the mounting portion in the axial direction. The outer dimension of the base is smaller than that of the mounting portion in the radial direction to form a step surface perpendicular to the axial direction at the junction of the base and the outer peripheral wall. One side of the fixing ring is provided with an annular end surface, and the annular end surface abuts against the step surface.

[0010] For example, according to some embodiments of the present disclosure, the free end extends axially away from the step surface.

[0011] For example, according to some embodiments of the present disclosure, the protruding portion is provided on the annular end surface.

[0012] For example, according to some embodiments of the present disclosure, the number of the receiving grooves is 1-10 and corresponds to the keys one by one. The number of the slots is 1-10 and corresponds to the protruding portions one by one. The number of the snap grooves is 2-10 and corresponds to the snap portions one by one.

[0013] For example, according to some embodiments of the present disclosure, the number of the receiving grooves and the slotted openings is more than one, and the plurality of keys, the plurality of snap portions, and the plurality of slotted openings are all arranged at uniform intervals.

[0014] The present disclosure also provides a vacuum interrupter, including the anti-twist mechanism according to any one of the foregoing embodiments, wherein the conductive rod is fixedly connected to the bellows inside the vacuum interrupter, and the fixing ring is fixedly connected to the housing of the vacuum interrupter.

[0015] The present disclosure also provides a vacuum circuit breaker, including the anti-twist mechanism according to any one of the foregoing embodiments or the vacuum interrupter according to the foregoing embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic plan view showing an anti-twist mechanism according to an embodiment of the present disclosure;

[0017] Figure 2 A schematic perspective view showing a guide sleeve according to an embodiment of the present disclosure;

[0018] Figure 3 Showing Figure 2 A schematic cross-sectional perspective view of the guide sleeve;

[0019] Figure 4 A schematic view showing a fixing ring according to an embodiment of the present disclosure;

[0020] Figure 5 A schematic view showing a conductive rod according to an embodiment of the present disclosure.

[0021] REFERENCE SIGNS

[0022] 1 Guide sleeve, 11 Mounting portion, 12 Inner hole wall, 13 Outer peripheral wall, 14 Key, 15 Slotted opening, 16 Snap portion, 17 Base portion, 18 Step surface, 19 Free end,

[0023] 2 Fixing ring, 21 Protrusion, 22 Annular end face, 23 Snap groove,

[0024] 3 Conductive rod, 31 Receiving groove DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] In order to make the objectives, solutions, and advantages of the technical solutions of the present disclosure clearer, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below with reference to the drawings of the specific embodiments of the present disclosure. Unless otherwise specified, the terms used herein have the ordinary meanings in the art. The same reference signs in the drawings represent the same components.

[0026] In the description of the present disclosure, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present disclosure can be understood according to specific circumstances.

[0027] For the sake of convenience of description, in the present disclosure, the extending direction of the central axis of the conductive rod is specified as the axial direction, the circumferential direction around the central axis is specified as the circumferential direction, and the direction perpendicular to the central axis away from or towards the central axis is specified as the radial direction.

[0028] Figure 1 A schematic plan view showing the mating state of the anti-twist mechanism according to the present disclosure. As Figure 1 shown, the anti-twist mechanism according to the present disclosure may include a guide sleeve 1, a fixing ring 2, and a conductive rod 3. In particular, the guide sleeve 1 and the fixing ring 2 may be annular, and the conductive rod 3 may be cylindrical or annular. Among them, the fixing ring 2 is sleeved outside the guide sleeve 1, and the conductive rod 3 is inserted into the guide sleeve 1. The three cooperate so that no relative rotation can occur in the circumferential direction, thereby ensuring good anti-twist performance. In particular, the fixing ring 2 can be fixed to the housing of a vacuum interrupter (not shown) including the anti-twist mechanism. At the same time, the conductive rod 3 can be fixed to an internal component (for example, a bellows) provided inside the vacuum interrupter. Through this anti-twist structure, when the conductive rod or the housing of the vacuum interrupter is twisted, the conductive rod and the vacuum interrupter will not generate relative torsion, and thus the bellows inside the vacuum interrupter will not be sprained.

[0029] Specifically, as Figure 2 and Figure 3 shown, the guide sleeve 1 according to the present disclosure may include a base portion 17 and a mounting portion 11 adjacent in the axial direction. The guide sleeve 1 further includes an internal through hole that axially penetrates the guide sleeve 1, that is, both the base portion 17 and the mounting portion 11 are penetrated by the internal through hole. This internal through hole is particularly a circular through hole and is formed by an inner hole wall 12.

[0030] A key 14 that radially protrudes inward from the inner hole wall 12 and extends axially may be provided on the inner hole wall 12. In particular, as Figure 3 shown, the key 14 extends axially on a part of the inner hole wall 12. For example, the key 14 is axially provided on the side where the mounting portion 11 is located. The number of keys 14 may be between 1 and 10. For example, as Figure 2For the two shown, an increase in quantity will bring about stronger anti-twist performance. In particular, when the number of keys 14 is greater than 1, the multiple keys 14 are arranged at uniform intervals, whereby the torque load can be more evenly distributed circumferentially.

[0031] The mounting portion 11 has a generally annular shape, and thus includes a circular outer peripheral wall 13 provided on the radially outer side, and the outer peripheral wall 13 is coaxial with the inner hole wall 12. A slotted groove 15 is provided on the mounting portion 11, which is recessed radially inward from the outer peripheral wall 13 and extends axially, as Figure 2 shown. In particular, the slotted groove 15 penetrates through the mounting portion 11. The number of slotted grooves 15 can be set, for example, between 1 and 10, such as Figure 2 shown for two. An increase in quantity will bring about stronger anti-twist performance. In particular, when the number of slotted grooves 15 is greater than 1, the multiple slotted grooves 15 are arranged at uniform intervals, whereby the torque load can be more evenly distributed circumferentially.

[0032] Furthermore, the mounting portion 11 further includes a plurality of snap portions 16 provided on the mounting portion 11 and at least partially extending axially. The free end 19 of the snap portion 16 projects radially out of the outer peripheral wall 13, as Figure 3 shown. In particular, there is a gap between the snap portion 16 and the mounting portion 11 in the radial direction, and this gap is particularly conducive to the deformation of the snap portion 16, especially the deformation in the radial direction. In addition, the free end 19 extends axially away from the above-mentioned base portion. In particular, the free end 19 gradually projects out of the outer peripheral wall 13 axially away from the above-mentioned base portion 17, as Figure 3 shown. The free end 13 and the end face of the mounting portion 11 away from the base portion {17} can be flush axially. The number of snap portions 16 can be between 2 and 10, such as Figure 2 shown for four. An increase in quantity will bring about stronger snap performance and further increase the strength of snap fixation. In particular, the multiple snap portions 16 are arranged at uniform intervals, whereby the axial load can be more evenly distributed circumferentially.

[0033] The base portion 17 can have an outer dimension smaller than that of the mounting portion 11 in the radial direction to form a stepped surface 18 perpendicular to the axial direction at the junction of the base portion 17 and the outer peripheral wall 11, as Figure 3 shown.

[0034] The fixing ring 2 is configured to be sleeved around the outer peripheral wall 13 to achieve the fixation of the guide sleeve 1. Specifically, the fixing ring 2 is provided with a protrusion 21 extending axially and adapted to cooperate with the slotted groove 15. The protrusion 21 has the same number as the slotted groove 15 and is in one-to-one correspondence and cooperation. The protrusion 21 is configured to extend into the slotted groove 15 and be able to abut against the slotted groove 15 on both sides in the circumferential direction, whereby the guide sleeve 1 and the fixing ring 2 will not rotate relative to each other in the circumferential direction, achieving the anti-twist fit between the guide sleeve 1 and the fixing ring 2.

[0035] The fixing ring 2 is also provided with an annular end face 22 on one side in the axial direction. The annular end face 22 is perpendicular to the axial direction and extends radially inwards from the ring wall of the fixing ring 2, as Figure 4 shown. Thus, the annular end face 22 can be abutted against the above-mentioned step face 18 in the axial direction, thereby restricting the relative movement of the guide sleeve 1 and the fixing ring 2 in the axial direction.

[0036] Furthermore, the fixing ring 2 is also provided with a snap groove 23 that penetrates the fixing ring 2 radially. The snap groove 23 is configured to cooperate with the free end 19 of the snap portion 16. The number of the snap grooves 23 is set to be the same as that of the snap portions 16 and corresponds to the snap portions 16 one by one. Since the free end 19 protrudes from the outer peripheral wall 13, it can extend into the snap groove 23, so that the free end 19 can be abutted against the snap groove 23 in the axial direction. In particular, it abuts against the end face of the free end 19 away from the step face 18, thereby fixing the guide sleeve 1 and the fixing ring 2 to each other at both ends and in two axial directions with respect to the above-mentioned step face 18.

[0037] Preferably, the above-mentioned protrusion 21 can be provided on the above-mentioned annular end face 22. In particular, the protrusion 21 can be a flanging portion provided on the annular end face 22, which is easy to manufacture and reduces costs.

[0038] Figure 5 Shown is a conductive rod 3 according to the present disclosure. The conductive rod 3 can be made of a conductive material such as iron, copper, or other alloy materials. The conductive rod 3 is configured to be installed in the inner through hole of the guide sleeve 1. The outer peripheral shape of the conductive rod 3 is adapted to the shape of the inner through hole, so that the conductive rod 3 can slide axially relative to the guide sleeve 1. A receiving groove 31 that cooperates with the above-mentioned key 14 can also be provided on the outer periphery of the conductive rod 3, so that the key 14 can extend into the receiving groove 31 and can be abutted against the receiving groove 31 on both sides in the circumferential direction. Thus, no relative circumferential rotation occurs between the conductive rod 3 and the guide sleeve 1, realizing the anti-twist fit between the conductive rod 3 and the guide sleeve 1. Furthermore, the key 14 also plays a guiding role, enabling the conductive rod 3 to perform axial movement along the key 14.

[0039] The anti-twist device according to the present disclosure is simple to manufacture, has a low assembly complexity, has good anti-twist performance, and can reduce costs.

[0040] The present disclosure also proposes a vacuum interrupter (not shown), including the above-mentioned anti-twist mechanism. Specifically, the fixing ring 2 can be fixed to the housing of the vacuum interrupter including this anti-twist mechanism. At the same time, the conductive rod 3 can be fixed to an internal component (such as a bellows) provided inside the vacuum interrupter. Through this anti-twist structure, when the conductive rod or the vacuum interrupter housing is twisted, no relative torsional movement occurs between the conductive rod and the vacuum interrupter, so that the bellows inside the vacuum interrupter will not be sprained.

[0041] Furthermore, the present disclosure also provides a vacuum circuit breaker, which includes the above-mentioned anti-twist mechanism or the above-mentioned vacuum interrupter.

[0042] It should be understood that the above description is intended to illustrate rather than limit. For example, the above embodiments (and / or aspects thereof) and the combinations of features in the embodiments can be used in combination with each other. Additionally, many modifications can be made to adapt a particular situation or material to the teachings of the present disclosure without departing from the scope of the present disclosure. The functions or performances of the various elements or modules described herein are for illustrative purposes only and are in no way restrictive, but are merely exemplary embodiments. After reading the above description, many other embodiments and modifications within the spirit and scope of the claims will be apparent to those skilled in the art. Therefore, the scope of the present disclosure should be determined with reference to the appended claims and the full scope of equivalents given by these claims.

[0043] In the following claims, the terms "comprising" and "wherein" are used as the plain English equivalents of the respective terms "including" and "in which". Additionally, in the following claims, the terms "first", "second", "third", etc. are used merely as labels and are not intended to impose numerical requirements on their objects.

Claims

1. A torsion prevention mechanism, characterized in that, Comprising A guide sleeve, including a mounting portion in a generally annular shape, the mounting portion including a circular outer peripheral wall provided on the radially outer side, the guide sleeve having a circular inner hole wall forming an internal through hole that axially penetrates the guide sleeve, the inner hole wall being coaxial with the outer peripheral wall, a key extending axially being provided on the inner hole wall, and a slot being provided on the mounting portion that radially recesses inward from the outer peripheral wall and extends axially. A fixing ring, sleeved around the outer peripheral wall, the fixing ring being provided with a protrusion extending axially and cooperating with the slot, the protrusion extending into the slot and being capable of abutting against the slot on both sides in the circumferential direction. A conductive rod, made of a conductive material and installed in the internal through hole of the guide sleeve, the shape of the conductive rod being adapted to the shape of the internal through hole, a receiving groove cooperating with the key being provided on the outer periphery of the conductive rod, the key extending into the receiving groove and being capable of abutting against the receiving groove on both sides in the circumferential direction.

2. The anti-twist mechanism according to claim 1, characterized in that The guide sleeve further includes a plurality of snap portions provided on the mounting portion and at least partially extending axially, the free ends of the snap portions radially protruding from the outer peripheral wall. The fixing ring is provided with a snap groove that radially penetrates the fixing ring and cooperates with the free ends of the snap portions, the free ends extending into the snap groove such that the free ends can abut against the snap groove in the axial direction.

3. The anti-twist mechanism according to claim 2, characterized in that A gap is provided between the snap portion and the mounting portion in the radial direction.

4. The anti-twist mechanism according to claim 2, characterized in that The guide sleeve includes an annular base adjacent to the mounting portion in the axial direction, the outer dimension of the base being smaller than that of the mounting portion in the radial direction to form a step surface perpendicular to the axial direction at the junction of the base and the outer peripheral wall. One side of the fixing ring is provided with an annular end surface, and the annular end surface abuts against the step surface.

5. The anti-twist mechanism according to claim 4, characterized in that The free ends extend axially away from the step surface.

6. The anti-twist mechanism according to claim 4, characterized in that The protrusion is provided on the annular end surface.

7. The anti-twist mechanism according to claim 2, characterized in that The number of the receiving grooves is 1 - 10 and corresponds one-to-one with the keys, the number of the slots is 1 - 10 and corresponds one-to-one with the protrusions, and the number of the snap grooves is 2 - 10 and corresponds one-to-one with the snap portions.

8. The anti-twist mechanism according to claim 2, characterized in that The number of the receiving grooves and the slots is more than one, and the plurality of keys, the plurality of snap portions and the plurality of slots are all arranged at uniform intervals.

9. A vacuum interrupter, characterized in that It includes the anti-twist mechanism according to any one of claims 1 - 8. The conductive rod is fixedly connected to the bellows inside the vacuum interrupter, and the fixing ring is fixedly connected to the housing of the vacuum interrupter.

10. A vacuum circuit breaker, characterized in that Including the anti-twisting mechanism according to any one of claims 1-8 or the vacuum interrupter according to claim 9.

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