Switch over-travel adjusting structure for vacuum alternating current contactor

Abstract

The utility model relates to a switch overtravel adjusting structure for a vacuum alternating current contactor, which comprises an operating mechanism and a three-phase vacuum arc extinguishing mechanism, the operating mechanism comprises a transmission shaft and a cantilever, and the vacuum arc extinguishing mechanism comprises an insulating pull rod moving up and down; a threaded rod is formed at the lower end of the insulating pull rod, penetrates through a rod hole formed in the cantilever and is connected with an upper limiting nut and a lower limiting nut, the cantilever is located between the upper limiting nut and the lower limiting nut, and a gap is reserved between the two limiting nuts for swinging of the cantilever. The upper end of the cantilever is in spherical sliding fit with the lower end of the upper limiting nut, and the lower end of the cantilever is in supporting sliding fit with the lower limiting nut. And the vertical movement of the insulating pull rod is not interfered, so that the stress direction is always consistent and gentle in the closing process of the vacuum bubble, and the service life of the vacuum bubble is longer.

Description

Technical Field

[0001] The utility model relates to the field of power grid switch equipment, in particular to a switch overtravel adjustment structure for a vacuum AC contactor. Background Art

[0002] The vacuum contactor includes an operating mechanism and a three-phase vacuum arc extinguishing mechanism. Each vacuum arc extinguishing mechanism includes a vacuum bubble and an insulating pull rod. The output end of the operating mechanism is a transversely arranged transmission shaft, which is connected to the three insulating pull rods respectively. The reciprocating rotation of the transmission shaft drives the insulating pull rods to move up and down synchronously to realize the opening and closing operations of the vacuum arc extinguishing mechanism.

[0003] The problem with the current AC vacuum contactor is that the contacts of the vacuum arc extinguishing mechanism need to maintain a certain contact pressure between the static contact and the moving contact in the arc extinguishing mechanism after electrical wear through the overtravel of the insulating pull rod. The current connection structure between the lower end of the insulating pull rod and the transmission shaft, such as Figure 1 As shown, the transmission shaft 91 of the operating mechanism and the moving shaft of the fixed cantilever 92 drive the cantilever 92 to rotate, and the insulating pull rod 93 in the vacuum arc extinguishing mechanism moves up and down, and the insulating pull rod 93 passes through the cantilever 92 to connect the lower nut, and the insulating pull rod 93 is placed on the upper nut, and the upper nut and the cantilever 92 are provided with a compression spring. During operation, the rotational movement of the cantilever 92 will interfere with the linear movement of the insulating pull rod 93, because the movement directions of the two are inconsistent, which affects the up and down movement of the insulating pull rod, and the upper end of the insulating pull rod is connected to the vacuum bubble. Such repeated operations will affect the service life of the vacuum bubble. Utility Model Content

[0004] The technical problem to be solved by the utility model is: to overcome the deficiencies of the prior art and provide a switch overtravel adjustment structure for a vacuum AC contactor, so as to solve the problem that in the current vacuum AC contactor, the cantilever and the insulating pull rod have inconsistent movement directions, resulting in interference in the vertical movement of the insulating pull rod, thereby affecting the service life of the vacuum bubble.

[0005] The technical solution adopted by the utility model to solve its technical problems is:

[0006] A switch overtravel adjustment structure for a vacuum AC contactor is provided, comprising:

[0007] An operating mechanism and a three-phase vacuum arc extinguishing mechanism, wherein the operating mechanism comprises a transmission shaft and a cantilever, and the vacuum arc extinguishing mechanism comprises an insulating pull rod that moves up and down;

[0008] The lower end of the insulating pull rod forms a threaded rod, which passes through a rod hole opened on the cantilever, and the threaded rod connects the upper limit nut and the lower limit nut. The cantilever is located between the upper limit nut and the lower limit nut, and a gap is left between the two limit nuts for the cantilever to swing;

[0009] A spherical sliding fit is formed between the upper end of the cantilever and the lower end of the upper limit nut, and a supporting sliding fit is formed between the lower end of the cantilever and the lower limit nut.

[0010] Furthermore, a sphere is formed at the lower end of the upper limit nut, a spherical body is formed at the upper end of the rod hole, and a spherical hole is formed, and the upper limit nut forms a spherical fit with the spherical hole of the cantilever through the sphere.

[0011] Furthermore, a supporting boss is provided at the lower end of the cantilever, and the lower end of the supporting boss forms a supporting fit with the upper end of the lower limit nut.

[0012] Furthermore, a gasket is arranged between the lower limit nut and the cantilever, and the supporting boss and the gasket form a supporting fit.

[0013] Furthermore, the supporting surface at the lower end of the supporting boss is a curved surface, and a line contact sliding fit is formed between the supporting boss and the gasket.

[0014] Furthermore, there are two supporting bosses, which are respectively located on both sides of the rod hole.

[0015] Furthermore, the upper limit nut and the lower limit nut are both provided with equally spaced grooves, and two stop pins are arranged on the threaded rod, and the two stop pins extend from the equally spaced grooves of the two limit nuts respectively to limit the rotation of the limit nuts.

[0016] Furthermore, an upper locking nut and a lower locking nut are provided on the threaded rod, the upper locking nut is located above the upper limit nut, and the lower locking nut is located below the lower limit nut.

[0017] Further, the cantilever is a U-shaped structure, which includes two mounting arms and a rod connecting arm;

[0018] The mounting arm is provided with an axial hole, the transmission shaft passes through the axial hole of the mounting arm, and is welded and fixed to the mounting arm;

[0019] The rod hole is arranged on the rod connecting arm.

[0020] The beneficial effects of the utility model are:

[0021] The utility model provides a switch overtravel adjustment structure for a vacuum AC contactor. When the cantilever drives the insulating pull rod to move up and down through rotational motion, it will not interfere with the vertical movement of the insulating pull rod, so that the force direction of the vacuum bubble is always consistent and smooth during the closing process, so that the vacuum bubble has a longer service life.

[0022] The clearance for the swing arm to move can be adjusted by rotating the upper limit nut and the lower limit nut. The insulating pull rod is spherically matched with the cantilever through the upper limit nut, and the insulating pull rod forms a line contact with the cantilever through the lower limit nut, which reduces the interference of the cantilever on the insulating pull rod, making it easy to adjust, evenly wear, and flexible to rotate.

[0023] By opening equally divided grooves on the limit nut, the operation is simpler and more intuitive when adjusting the overtravel. One grid corresponds to an upper and lower position of 0.25mm, and the stop pin inserted in the equally divided groove can effectively prevent the nut from rotating, thereby ensuring the stability of the overtravel.

[0024] The cantilever is a U-shaped piece. The bent cantilever is not easy to deform. The ring welding connection method is more solid and can bear a greater closing force. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The utility model is further described below in conjunction with the accompanying drawings.

[0026] Figure 1 Schematic diagram of the traditional switch overtravel adjustment structure;

[0027] Figure 2 It is a schematic diagram of a vacuum AC contactor;

[0028] Figure 3 and Figure 4 This is a schematic diagram of the overtravel adjustment structure of a switch for a vacuum AC contactor of the utility model;

[0029] Figure 5 It is a schematic diagram of an insulating pull rod;

[0030] Figure 6 and Figure 7 is a schematic diagram of the cantilever;

[0031] Figure 8 This is a schematic diagram of the upper limit nut;

[0032] Among them, 11, vacuum arc extinguishing mechanism, 12, transmission shaft;

[0033] 2. cantilever, 21. rod hole, 22. ball hole, 23. supporting boss;

[0034] 3. Insulating pull rod, 31. Upper locking nut, 32. Lower locking nut;

[0035] 4. Upper limit nut, 41. Ball;

[0036] 5. Lower limit nut, 51. Washer;

[0037] 6. Stop pin. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solution and advantages of the embodiments of the utility model clearer, the technical solution of the utility model will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0039] The present application provides a switch overtravel adjustment structure for a vacuum AC contactor, which is described in detail below. It should be noted that the description order of the following embodiments is not intended to limit the preferred order of the embodiments of the present application. In the following embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, please refer to the relevant description of other embodiments.

[0040] In order to solve the technical problem in the prior art that the cantilever 2 and the insulating rod 3 in the vacuum AC contactor have inconsistent movement directions, resulting in interference in the vertical movement of the insulating rod 3 and thus affecting the service life of the vacuum bubble, an embodiment of the present application provides a switch overtravel adjustment structure for a vacuum AC contactor, which is described in detail below.

[0041] like Figures 2 to 8 As shown, a switch overtravel adjustment structure for a vacuum AC contactor includes:

[0042] The operating mechanism and the three-phase vacuum arc extinguishing mechanism 11 , the operating mechanism comprises a transmission shaft 12 and a cantilever 2 , one end of the cantilever 2 is fixed to the transmission shaft 12 , and the cantilever 2 reciprocates with the transmission shaft 12 .

[0043] The vacuum arc extinguishing mechanism 11 includes an insulating rod 3 that moves up and down, the upper end of the insulating rod 3 is connected to the moving contact in the vacuum bubble, and the operating mechanism is connected to the insulating rod 3 through the cantilever 2, thereby driving the insulating rod 3 to move up and down, thereby realizing the closing and opening of the moving contact and the static contact in the vacuum bubble.

[0044] In this embodiment, the lower end of the insulating pull rod 3 is formed into a threaded rod, and the threaded rod passes through the rod hole 21 opened on the cantilever 2. The threaded rod connects the upper limit nut 4 and the lower limit nut 5. The cantilever 2 is located between the upper limit nut 4 and the lower limit nut 5. A gap is left between the two limit nuts for the cantilever 2 to swing.

[0045] The threaded rod also has sufficient radial movement space in the rod hole 21 .

[0046] A spherical sliding fit is formed between the upper end of the cantilever 2 and the lower end of the upper limit nut 4 , and a supporting sliding fit is formed between the lower end of the cantilever 2 and the lower limit nut 5 .

[0047] Specifically, as an optional implementation in this embodiment, Figures 3 to 8 As shown, the lower end of the upper limit nut 4 forms a sphere 41 , the upper end of the rod hole 21 forms a ball hole 22 , and the upper limit nut 4 forms a spherical fit with the ball hole 22 of the cantilever 2 through the ball 41 .

[0048] like Figure 6 As shown, the ball hole 22 is turned to form an inner chamfer structure at the upper end of the rod hole 21, and the chamfer surface is a concave curved surface.

[0049] like Figure 8 In the upper limit nut 4 shown, the ball 41 and the nut body are an integral structure.

[0050] Specifically, as an optional implementation in this embodiment, Figure 7 As shown, a supporting boss 23 is provided at the lower end of the cantilever 2 , and the lower end of the supporting boss 23 forms a supporting fit with the upper end of the lower limit nut 5 .

[0051] In order to make the cantilever 2 slide and fit better with the lower limit nut 5 , in this embodiment, a gasket 51 is arranged between the lower limit nut 5 and the cantilever 2 , and the supporting boss 23 and the gasket 51 form a supporting fit.

[0052] The gasket 51 is a sheet-like structure, and when the gasket 51 cooperates with the supporting boss 23 , it can guide the cantilever 2 to slide more flexibly.

[0053] Specifically, as an optional implementation in this embodiment, Figure 7 As shown, the supporting surface at the lower end of the supporting boss 23 is a curved surface, and a line contact sliding fit is formed between the supporting boss 23 and the gasket 51 .

[0054] By forming a line contact between the support boss 23 and the gasket 51, the friction force can be reduced, the sliding of the two can be more flexible, and the sliding contact area can be reduced.

[0055] Specifically, as an optional implementation in this embodiment, Figure 7 As shown, there are two supporting bosses 23 , which are respectively located on both sides of the rod hole 21 .

[0056] The two supporting bosses 23 can ensure stable support between the cantilever 2 and the gasket 51 .

[0057] Specifically, as an optional implementation in this embodiment, Figure 4 Figure 5 Figure 8As shown, the upper limit nut 4 and the lower limit nut 5 are both provided with equally spaced grooves, and two stop pins 6 are arranged on the threaded rod. The two stop pins 6 extend out from the equally spaced grooves of the two limit nuts respectively to limit the rotation of the limit nuts.

[0058] In this embodiment, the lower limit nut 5 adopts GB6178 hexagonal slotted thin nut, and the upper limit nut 4 has the same specifications as the lower limit nut 5, except that a sphere 41 is processed at the lower end of the upper limit nut 4.

[0059] Specifically, as an optional implementation in this embodiment, Figure 7 As shown, an upper locking nut 31 and a lower locking nut 32 are provided on the threaded rod, the upper locking nut 31 is located above the upper limit nut 4, and the lower locking nut 32 is located below the lower limit nut 5.

[0060] The upper locking nut 31 and the lower locking nut 32 are mainly used to tighten the limit nut to prevent it from rotating and cutting off the stop pin 6. The stop pin 6 radially passes through the insulating pull rod 3. If the limit nut loosens and rotates, it will generate shear force on the stop pin 6. Now with the locking nut, an additional layer of protection is provided.

[0061] Specifically, as an optional implementation in this embodiment, Figure 6 Figure 7 As shown, the cantilever 2 is in a U-shaped structure, which includes two mounting arms and a rod connecting arm; the two mounting arms are in a parallel structure, and the connecting arm connects the left and right mounting arms.

[0062] The mounting arm is provided with an axial hole, and the transmission shaft 12 passes through the axial hole of the mounting arm and is welded and fixed to the mounting arm; the welding method is annular welding;

[0063] The rod hole 21 is provided in the rod connecting arm.

[0064] The switch overtravel adjustment structure for the vacuum AC contactor of this embodiment, when the transmission shaft 12 drives the cantilever 2 to rotate for closing, the cantilever 2 rotates upward, driving the insulating pull rod 3 to move upward, the lower end of the cantilever 2 slides in line contact with the lower limit nut 5, and the upper end of the cantilever 2 slides in spherical contact with the upper limit nut 4, so that the cantilever 2 can slide easily and flexibly drive the insulating pull rod 3 to move upward, reducing interference with the insulating pull rod 3, so that the insulating pull rod 3 can be stably lifted for closing, and when opening, the transmission shaft 12 rotates in the opposite direction, and the cantilever 2 rotates in the opposite direction to drive the insulating pull rod 3 to move downward for opening.

[0065] The various devices selected in this application (components whose specific structures are not described) are all universal standard parts or components known to technical personnel in this field, and their structures and principles can be known to technical personnel through technical manuals or through conventional experimental methods.

[0066] In the description of the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0067] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0068] In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. The device embodiments described above are merely schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some communication interfaces, and the indirect coupling or communication connection of devices or units can be electrical, mechanical or other forms.

[0069] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0070] In addition, each functional unit in each embodiment of the present utility model may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0071] Based on the above ideal embodiments of the utility model, the relevant staff can make various changes and modifications without deviating from the technical concept of the utility model through the above description. The technical scope of the utility model is not limited to the content of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A switch overtravel adjustment structure for a vacuum AC contactor, characterized in that: include An operating mechanism and a three-phase vacuum arc extinguishing mechanism (11), wherein the operating mechanism comprises a transmission shaft (12) and a cantilever (2), and the vacuum arc extinguishing mechanism (11) comprises an insulating pull rod (3) that moves up and down; The lower end of the insulating pull rod (3) is formed into a threaded rod, and the threaded rod passes through a rod hole (21) provided on the cantilever (2). The threaded rod is connected to an upper limit nut (4) and a lower limit nut (5). The cantilever (2) is located between the upper limit nut (4) and the lower limit nut (5). A gap is left between the two limit nuts for the cantilever (2) to swing. A spherical sliding fit is formed between the upper end of the cantilever (2) and the lower end of the upper limit nut (4), and a supporting sliding fit is formed between the lower end of the cantilever (2) and the lower limit nut (5).

2. The switch overtravel adjustment structure for vacuum AC contactor according to claim 1 is characterized in that: The lower end of the upper limit nut (4) forms a sphere (41), the upper end of the rod hole (21) forms a ball hole (22), and the upper limit nut (4) forms a spherical fit with the ball hole (22) of the cantilever (2) through the sphere (41).

3. The switch overtravel adjustment structure for vacuum AC contactor according to claim 1 is characterized in that: A supporting boss (23) is provided at the lower end of the cantilever (2), and the lower end of the supporting boss (23) forms a supporting fit with the upper end of the lower limit nut (5).

4. The switch overtravel adjustment structure for vacuum AC contactor according to claim 3 is characterized in that: A gasket (51) is arranged between the lower limit nut (5) and the cantilever (2), and the supporting boss (23) and the gasket (51) form a supporting fit.

5. The switch overtravel adjustment structure for vacuum AC contactor according to claim 4 is characterized in that: The supporting surface at the lower end of the supporting boss (23) is a curved surface, and a line contact sliding fit is formed between the supporting boss (23) and the gasket (51).

6. The switch overtravel adjustment structure for vacuum AC contactor according to claim 3 is characterized in that: There are two supporting bosses (23), which are respectively located on both sides of the rod hole (21).

7. The switch overtravel adjustment structure for vacuum AC contactor according to claim 1 is characterized in that: The upper limit nut (4) and the lower limit nut (5) are both provided with equally spaced grooves, and two stop pins (6) are provided on the threaded rod. The two stop pins (6) extend from the equally spaced grooves of the two limit nuts respectively to limit the rotation of the limit nuts.

8. The switch overtravel adjustment structure for vacuum AC contactor according to claim 1 is characterized in that: An upper locking nut (31) and a lower locking nut (32) are arranged on the threaded rod, wherein the upper locking nut (31) is located above the upper limit nut (4), and the lower locking nut (32) is located below the lower limit nut (5).

9. The switch overtravel adjustment structure for vacuum AC contactor according to claim 1, characterized in that: The cantilever (2) is in a U-shaped structure, comprising two mounting arms and a rod connecting arm; An axial hole is provided on the mounting arm, and the transmission shaft (12) passes through the axial hole of the mounting arm and is welded and fixed to the mounting arm; The rod hole (21) is opened in the rod connecting arm.

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