A movable conductive rod for vacuum interrupter

Abstract

The present invention relates to a moving conductive rod for a vacuum arc extinguishing chamber, which comprises a moving conductive rod, a shielding flange integrally formed around one end of the moving conductive rod facing the contact, the shielding flange and the moving conductive rod have the same central axis, the side wall of the shielding flange facing the center of the moving conductive rod is integrally formed with a ring platform with the same central axis as the two, and the part of the moving conductive rod away from the shielding flange is milled to form at least one anti-rotation surface for rotationally locking the moving conductive rod, and the anti-rotation surface is parallel to the central axis of the moving conductive rod. The present invention can improve production efficiency while increasing the sealing of the moving conductive rod when in use.

Description

Technical Field

[0001] The invention relates to the technical field of conductive rods, in particular to a movable conductive rod used in a vacuum interrupter. Background Art

[0002] The vacuum interrupter, also known as the vacuum switch tube, is the core component of medium and high voltage power switches. Its main function is to quickly extinguish the arc and suppress the current after the medium and high voltage circuit is cut off from the power supply through the excellent insulation of the vacuum inside the tube. The main structural parts of the vacuum interrupter are the insulating shell, dynamic and static cover plates, contacts, bellows, shielding cover, dynamic and static conductive rods, guide sleeves, etc.; among them, the guide sleeve is fitted onto the dynamic conductive rod.

[0003] At present, because the contact and the moving pole are not easy to be welded at one time, the moving tube core must be welded first when producing the vacuum arc extinguishing chamber, resulting in relatively complicated production processes and relatively low efficiency.

[0004] In the prior art, a Chinese patent with publication number CN203300538U discloses a welding structure of a moving conductive rod and a contact for a vacuum arc extinguishing chamber, and its technical highlights are: comprising a moving conductive rod and a contact of the vacuum arc extinguishing chamber, a protrusion is provided at one end of the moving conductive rod, a hole is opened on the contact, the contact is mounted on the moving conductive rod and the two are welded by solder, and the hole on the contact is riveted to the protrusion on the moving conductive rod.

[0005] The above-mentioned prior art solutions have the following defects: when the vacuum arc chamber is in use, since the moving conductive rod needs to be closed and shielded by a shielding cover and a bellows, in order to facilitate installation, when in use, the bellows is often connected to the moving conductive rod through a shielding disk welded thereto. The moving conductive rod and the shielding disk are welded. Since multiple welding processes are used during production, cold welding and air leakage are prone to occur. Therefore, multiple additional inspection processes for testing the welding parts are required during production, resulting in relatively poor production efficiency and the sealing of the connection between the moving conductive rod and the shielding disk. Summary of the invention

[0006] In view of the deficiencies in the prior art, one of the objects of the present invention is to provide a moving conductive rod for a vacuum arc extinguishing chamber, which can improve production efficiency while increasing the sealing of the moving conductive rod during use.

[0007] The above-mentioned object of the present invention is achieved through the following technical solutions:

[0008] A moving conductive rod for a vacuum arc extinguishing chamber comprises a moving conductive rod, a shielding flange integrally formed around one end of the moving conductive rod facing a contact, the shielding flange and the moving conductive rod having the same central axis, a ring platform integrally formed on the side wall of the shielding flange facing the center of the moving conductive rod having the same central axis as the two, and at least one anti-rotation surface for rotationally locking the moving conductive rod is formed by milling a portion of the moving conductive rod away from the shielding flange, and the anti-rotation surface is parallel to the central axis of the moving conductive rod.

[0009] By adopting the above technical scheme, when in use, the end of the bellows is sleeved on the outer wall of the ring platform, so that the bellows can be connected to the shielding flange and then welded, thereby optimizing the efficiency during production. At the same time, the shielding flange is integrally formed on the moving conductive rod, which can effectively reduce the welding process and the welding detection process in the production process, thereby effectively optimizing the efficiency during production, and at the same time, effectively increase the sealing between the moving conductive rod and the bellows, optimize the use effect, and when in use, the part of the moving conductive rod with the anti-rotation surface is clamped in the guide sleeve, so that the moving conductive rod can be rotationally locked, which can effectively reduce the possibility of looseness or gap between the bellows and the shielding flange due to the rotation of the moving conductive rod during use, thereby increasing the stability of the seal during use.

[0010] In a preferred example, the present invention can be further configured as follows: a connecting groove is provided around the connecting portion between the outer edge of the ring platform and the shielding flange, and the connecting groove is coaxial with the moving conductive rod.

[0011] By adopting the above technical scheme, during use, since welding defects such as cold welds often occur during welding, and welding materials are prone to accumulation during corner welding; the connecting groove can make the end edge of the bellows be clamped in the connecting groove when the bellows is welded to the shielding flange, so that during welding, the welding material can be effectively increased to be relatively fully combined with the ring table through the connecting groove after melting, and the solidified welding material can be consolidated through the connecting groove to further reduce the possibility of sealing defects between the moving conductive rod and the bellows during production, reduce the defective product rate during production, thereby optimizing the efficiency during production and increasing the sealing during use.

[0012] In a preferred example, the present invention can be further configured as follows: the cross-section of the connecting groove along the axial direction of the moving conductive rod is a right-angled trapezoid, the right-angled sides of the right-angled trapezoid of the connecting groove cross-section coincide with the annular surface of the ring platform away from its central axis, and the connecting groove is open at the large end.

[0013] By adopting the above technical solution, when in use, the end edge of the bellows can abut against the groove wall where the short bottom edge of the right-angled trapezoid of the connecting groove section is located, which can effectively increase the contact area between the welding material and the ring platform and the bellows after melting during welding, so as to increase the stability during welding, thereby further reducing the possibility of cold welding.

[0014] In a preferred example, the present invention can be further configured as follows: the length of the short base side of the trapezoidal cross-section of the connecting groove is greater than 0.3 mm.

[0015] By adopting the above technical solution, and because the bellows is usually made of stainless steel with a wall thickness of 0.1-0.2mm, the short bottom side length of the right-angled trapezoid in the connecting groove section is greater than 0.3mm, so that when the bellows is inserted into the connecting groove, it can be against the groove wall of the connecting groove that is perpendicular to the central axis of the moving conductive rod, thereby reducing the gap between the bellows and the groove wall of the connecting groove, thereby further optimizing the stability and effect of welding.

[0016] In a preferred example, the present invention can be further configured as follows: the anti-rotation surface is provided with an anti-rotation groove extending along the axial direction of the moving conductive rod, the anti-rotation groove can be clamped with a block fixedly connected to the guide sleeve, and the anti-rotation groove extends in a direction away from the shielding flange and has an open structure.

[0017] By adopting the above technical solution, since the bellows is connected to the moving conductive rod through the shielding flange, if the moving conductive rod rotates circumferentially, it is more likely to damage the connection between it and the bellows. By using the anti-rotation groove to clamp the block fixedly connected to the guide sleeve, the rotation of the moving conductive rod can be further restricted, so as to further optimize the stability during use and reduce the impact on the sealing between the shielding flange and the bellows.

[0018] In a preferred example, the present invention can be further configured as follows: the anti-rotation groove is a dovetail groove or a T-slot.

[0019] By adopting the above technical solution, the restriction on the block of the guide sleeve during use can be further increased, thereby optimizing the use effect.

[0020] In a preferred example, the present invention may be further configured as follows: a buffering member for buffering is provided in the anti-rotation groove.

[0021] By adopting the above technical solution, since the rotation of the moving conductive rod is restricted by the clamping block clamped in the anti-rotation groove, the moving conductive rod needs to slide axially when in use, and there is a possibility that the clamping block fixedly connected to the guide sleeve will abut against the groove wall of the anti-rotation groove. At this time, a certain impact force will be generated on the guide sleeve, resulting in the possibility of the guide sleeve loosening. A buffer member for buffering is provided in the anti-rotation groove to buffer the impact force received by the clamping block when in use.

[0022] In a preferred example, the present invention can be further configured as follows: the buffer component includes a slider and a plurality of elastic gaskets, the slider is slidably connected in the anti-rotation groove, the elastic gasket is arc-shaped in length and is arranged on the side of the slider facing the shielding flange, the slider is fixedly connected to a guide rod parallel to the moving conductive rod, the guide rod is outer sleeved with two guide tubes, the two guide tubes are respectively fixedly connected to the guide rod and the groove wall of the anti-rotation groove, and the two ends of the elastic gasket are respectively fixedly connected to the two guide tubes.

[0023] By adopting the above technical solution, when in use, when the block fixedly connected to the guide sleeve abuts against the slider, the two elastic gaskets will bend to cushion the impact force suffered by the block fixedly connected to the guide sleeve. At the same time, when in use, the guide tube slides along the axis of the guide rod, which can limit and guide the bending of the elastic gasket during use, thereby optimizing the stability during use.

[0024] In a preferred example, the present invention can be further configured as follows: the inner wall of the guide tube is adapted to the guide rod, and the guide rod is a polygonal column.

[0025] By adopting the above technical solution, the stability of the guide tube when it slides axially along the guide rod during use can be further increased, and the circumferential rotation of the guide rod can be restricted, thereby reducing the probability of the elastic gasket touching the wall of the anti-rotation groove during use and affecting the use effect.

[0026] In summary, the present invention includes at least one of the following beneficial technical effects:

[0027] 1. When in use, the end of the bellows is covered on the outer wall of the ring platform, so that the bellows is connected to the shielding flange and then welded, which optimizes the efficiency during production. At the same time, the shielding flange is integrally formed on the dynamic conductive rod, which can effectively reduce the welding process and the welding detection process during the production process, which can effectively optimize the efficiency during production. At the same time, it can effectively increase the sealing between the dynamic conductive rod and the bellows, optimize the use effect, and when in use, the part of the dynamic conductive rod with the anti-rotation surface is clamped in the guide sleeve, which can lock the dynamic conductive rod for rotation, which can effectively reduce the possibility of looseness or gap between the bellows and the shielding flange caused by the rotation of the dynamic conductive rod during use, so as to increase the stability of the seal during use;

[0028] 2. During use, since welding defects such as cold welds often occur during welding, and welding materials are prone to accumulation during corner welding, the connecting groove can enable the end edge of the bellows to be clamped in the connecting groove when the bellows is welded to the shielding flange, so that during welding, the welding material can be effectively increased to be relatively fully combined with the ring table through the connecting groove after melting, and the solidified welding material can be consolidated through the connecting groove to further reduce the possibility of sealing defects between the moving conductive rod and the bellows during production, reduce the defective product rate during production, thereby optimizing production efficiency and increasing sealing during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a structural diagram of the first embodiment.

[0030] Figure 2 It is a structural diagram of the second embodiment.

[0031] Figure 3 yes Figure 2 The partially enlarged schematic diagram of part A is mainly used to show the structure of the buffer.

[0032] In the figure, 1, moving conductive rod; 11, shielding flange; 12, ring platform; 13, connecting groove; 14, anti-rotation surface; 141, anti-rotation groove; 15, buffer; 151, slider; 152, elastic gasket; 153, guide rod; 154, guide tube. DETAILED DESCRIPTION

[0033] The present invention is further described in detail below in conjunction with the accompanying drawings.

[0034] Embodiment 1

[0035] Reference Figure 1 , a moving conductive rod for a vacuum arc extinguishing chamber disclosed in the present invention, includes a moving conductive rod 1, a shielding flange 11 is integrally formed around one end of the moving conductive rod 1 facing the contact, the shielding flange 11 and the moving conductive rod 1 have the same central axis, and a side wall of the shielding flange 11 facing the center of the moving conductive rod 1 is integrally formed with a ring platform 12 having the same central axis as the two, and the ring platform 12 can be clamped on the end of a bellows used for shielding.

[0036] The portion of the moving conductive rod 1 away from the shielding flange 11 is milled to form two mutually parallel anti-rotation surfaces 14, which can be clamped in the guide sleeve during installation to perform rotation locking on the moving conductive rod 1. The anti-rotation surface 14 is parallel to the central axis of the moving conductive rod 1, and the anti-rotation surface 14 extends to the end of the moving conductive rod 1 away from the shielding flange 11.

[0037] When in use, the end of the bellows is sleeved on the outer wall of the ring platform 12 to facilitate the connection of the bellows to the shielding flange 11 and then welding, thereby optimizing the efficiency during production. At the same time, the shielding flange 11 is integrally formed on the moving conductive rod 1, which can effectively reduce the welding process and the welding detection process during the production process, thereby effectively optimizing the efficiency during production, and at the same time effectively increasing the sealing between the moving conductive rod 1 and the bellows, thereby optimizing the use effect. When in use, the part of the moving conductive rod 1 with the anti-rotation surface 14 is clamped in the guide sleeve, thereby locking the moving conductive rod 1 in rotation, thereby effectively reducing the possibility of looseness or gap between the bellows and the shielding flange 11 due to the rotation of the moving conductive rod 1 during use, thereby increasing the stability of the seal during use.

[0038] Reference Figure 1 A connection groove 13 is provided around the outer edge of the ring platform 12 and the connection part of the shielding flange 11. The connection groove 13 is a ring groove and is coaxial with the moving conductive rod 1. The end edge of the bellows can be clamped in the connection groove 13. During use, since welding defects such as cold welding often occur during welding, and welding materials are easily accumulated during corner welding; through the connection groove 13, the end edge of the bellows can be clamped in the connection groove 13 when the bellows is welded to the shielding flange 11, so that during welding, the welding materials can be effectively increased to be relatively fully combined with the ring platform 12 through the connection groove 13 after melting, and the solidified welding materials can be consolidated through the connection groove 13, so as to further reduce the possibility of sealing defects between the moving conductive rod 1 and the bellows during production, reduce the defective product rate during production, thereby optimizing the efficiency during production and increasing the sealing during use.

[0039] Embodiment 2

[0040] Reference Figure 2 , which is different from the first embodiment in that the cross section of the connecting groove 13 along the axial direction of the moving conductive rod 1 is a right-angled trapezoid, the two right-angled sides of the cross section of the connecting groove 13 directly overlap with the annular surface of the ring platform 12 away from its central axis, and the connecting groove 13 is open at the large end. Among them, the short bottom side of the right-angled trapezoid of the cross section of the connecting groove 13 is perpendicular to the central axis of the moving conductive rod 1, and the length of the short bottom side of the right-angled trapezoid of the cross section of the connecting groove 13 is greater than 0.3 mm.

[0041] So that when in use, the end edge of the bellows can abut against the groove wall where the short bottom side of the right-angled trapezoid of the cross-section of the connecting groove 13 is located, which can effectively increase the contact area between the welding material and the ring platform 12 and the bellows after melting during welding, so as to increase the stability during welding, thereby further reducing the possibility of cold welding; at the same time, since the bellows is usually made of stainless steel with a wall thickness of 0.1-0.2mm, the short bottom side length of the right-angled trapezoid of the cross-section of the connecting groove 13 is greater than 0.3mm, when the bellows is inserted into the connecting groove 13, it can abut against the groove wall of the connecting groove 13 perpendicular to the central axis of the dynamic conductive rod 1, reducing the gap between the bellows and the groove wall of the connecting groove 13, so as to further optimize the stability and effect of welding.

[0042] The anti-rotation surface 14 is provided with an anti-rotation groove 141 extending along the axial direction of the movable conductive rod 1. The anti-rotation groove 141 can be provided with a clamping block fixedly connected to the guide sleeve, and the anti-rotation groove 141 extends in a direction away from the shielding flange 11. The anti-rotation groove 141 opens in a direction away from the central axis of the movable conductive rod 1 and the shielding flange 11. The anti-rotation groove 141 is a dovetail groove or a T-shaped groove, preferably a dovetail groove, so as to increase the restriction on the clamping block of the guide sleeve during use and optimize the use effect.

[0043] Since the bellows is connected to the moving conductive rod 1 through the shielding flange 11, if the moving conductive rod 1 rotates circumferentially, it is more likely to damage the connection between it and the bellows. By clamping a block fixedly connected to the guide sleeve through the anti-rotation groove 141, the rotation of the moving conductive rod 1 can be further restricted to further optimize the stability during use and reduce the impact on the sealing between the shielding flange 11 and the bellows.

[0044] Reference Figure 2 and Figure 3 Since the movable conductive rod 1 is restricted from rotating by a card block stuck in the anti-rotation groove 141, the movable conductive rod 1 needs to slide axially when in use. There is a possibility that the card block fixedly connected to the guide sleeve will abut against the groove wall of the anti-rotation groove 141. At this time, a certain impact force will be generated on the guide sleeve, resulting in the possibility of the guide sleeve loosening. A buffer member 15 for buffering is provided in the anti-rotation groove 141 to buffer the impact force received by the card block when in use.

[0045] The buffer 15 includes a slider 151 adapted to the cross section of the anti-rotation groove 141 and two elastic gaskets 152. The slider 151 is slidably connected in the anti-rotation groove 141. The length of the elastic gasket 152 is arc-shaped and it is arranged on the side of the slider 151 facing the shielding flange 11. The arc-shaped openings of the two elastic gaskets 152 face each other. The slider 151 is fixedly connected to a guide rod 153 parallel to the moving conductive rod 1, and the guide rod 153 is located in the middle of the two elastic gaskets 152. The guide rod 153 is covered with two guide tubes 154. The two guide tubes 154 are respectively fixedly connected to the guide rod 153 and the groove wall of the anti-rotation groove 141 at one end facing the shielding flange 11. The two ends of the elastic gasket 152 are respectively fixedly connected to the two guide tubes 154. Among them, the elastic gasket 152 is integrally formed with the guide tube 154, and the elastic gasket 152 is a plate made of elastic high-temperature resistant material.

[0046] When in use, when the block fixedly connected to the guide sleeve abuts against the slider 151, the two elastic gaskets 152 will bend to cushion the impact force borne by the block fixedly connected to the guide sleeve. At the same time, when in use, the guide tube 154 slides along the axis of the guide rod 153, which can limit and guide the bending of the elastic gasket 152 during use, thereby optimizing the stability during use and effectively reducing the impact on the electromagnetic field in the vacuum arc extinguishing chamber.

[0047] Reference Figure 2 and Figure 3 The cross section of the guide rod 153 is a regular hexagon, and the inner wall of the guide tube 154 is adapted to the outer wall of the guide rod 153. This further increases the stability of the guide tube 154 when sliding along the axial direction of the guide rod 153 during use, and can limit the circumferential rotation of the guide rod 153, thereby reducing the probability that the elastic gasket 152 touches the groove wall of the anti-rotation groove 141 during use, thereby affecting the use effect.

[0048] The cross section of the elastic gasket 152 is arc-shaped and its arc-shaped opening faces the guide rod 153, so as to optimize the elastic deformation performance of the elastic gasket 152, thereby optimizing the stability during use.

[0049] The embodiments of this specific implementation method are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A movable conductive rod for a vacuum interrupter, comprising a movable conductive rod (1), characterized in that: A shielding flange (11) is integrally formed around one end of the movable conductive rod (1) facing the contact, the shielding flange (11) and the movable conductive rod (1) have the same central axis, a ring platform (12) is integrally formed on the side wall of the shielding flange (11) facing the center of the movable conductive rod (1) and having the same central axis as the two, and at least one anti-rotation surface (14) for rotationally locking the movable conductive rod (1) is formed by milling a portion of the movable conductive rod (1) away from the shielding flange (11), the anti-rotation surface (14) being flat. The guide sleeve (14) is provided with a connecting groove (13) around the connecting portion between the outer edge of the ring platform (12) and the shielding flange (11), and the connecting groove (13) is coaxial with the moving conductive rod (1); the anti-rotation surface (14) is provided with an anti-rotation groove (141) extending along the axial direction of the moving conductive rod (1), and the anti-rotation groove (141) can be clamped with a clamping block fixedly connected to the guide sleeve, and the anti-rotation groove (141) extends in a direction away from the shielding flange (11) and is in an open structure.

2. The movable conductive rod for a vacuum interrupter according to claim 1, characterized in that: The cross section of the connection groove (13) along the axial direction of the movable conductive rod (1) is in the form of a right-angled trapezoid, the right-angled sides of the right-angled trapezoid of the cross section of the connection groove (13) coincide with the annular surface of the ring platform (12) away from its central axis, and the connection groove (13) is open at the large end.

3. The movable conductive rod for a vacuum interrupter according to claim 2, characterized in that: The short bottom side length of the trapezoidal cross-section of the connecting groove (13) is greater than 0.3 mm.

4. A movable conductive rod for a vacuum interrupter according to claim 1, characterized in that The anti-rotation groove (141) is a dovetail groove or a T-shaped groove.

5. The movable conductive rod for a vacuum interrupter according to claim 1, characterized in that: A buffer member (15) for buffering is arranged in the anti-rotation groove (141).

6. The movable conductive rod for a vacuum interrupter according to claim 5, characterized in that: The buffer member (15) comprises a slider (151) and a plurality of elastic gaskets (152); the slider (151) is slidably connected in the anti-rotation groove (141); the elastic gasket (152) is arc-shaped in length and is arranged on the side of the slider (151) facing the shielding flange (11); the slider (151) is fixedly connected to a guide rod (153) parallel to the moving conductive rod (1); the guide rod (153) is covered with two guide tubes (154); the two guide tubes (154) are respectively fixedly connected to the guide rod (153) and the groove wall of the anti-rotation groove (141); and the two ends of the elastic gasket (152) are respectively fixedly connected to the two guide tubes (154).

7. The movable conductive rod for a vacuum interrupter according to claim 6, characterized in that: The inner wall of the guide tube (154) is adapted to fit the guide rod (153), and the guide rod (153) is a polygonal column.

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