Sealing structure of tap switch operating mechanism

Abstract

The utility model provides a sealing structure of a tap switch operating mechanism, which comprises a welding flange, a mounting flange, a conical shaft sleeve and a shaft seal, the welding flange is welded at the top of a transformer box cover, the mounting flange is arranged at the bottom of the operating mechanism and is connected with the welding flange through a bolt, the outer wall surface of the conical shaft sleeve is a conical surface, and the conical shaft sleeve is sleeved outside a main shaft. According to the tap switch operating mechanism, through the taper fit of the mounting flange and the conical shaft sleeve, the taper interference is realized, and the sealing performance of the tap switch operating mechanism is improved.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of a tap changer operating mechanism, in particular to a sealing structure of a tap changer operating mechanism. BACKGROUND

[0002] The tap changer operating mechanism is installed outside a transformer oil tank, and needs to have reliable sealing performance in addition to the function of driving the tap changer body in the transformer oil tank to shift gears, so as to ensure that the transformer oil in the transformer oil tank does not leak out of the tap changer operating mechanism.

[0003] As disclosed in Chinese Patent CN112002571A, a no-field tap changer operating mechanism has a mounting flange in an integral casting structure, and pores and sand holes inevitably exist in the casting part, which leads to a very high unqualified rate of the mounting flange in a sealing test.

[0004] In addition, the sealing test of the mounting flange usually lasts only 24 hours, and some small sand holes will not leak in this test time, but leakage cases have also occurred in the long-term working process. Some mounting flanges of tap changer operating mechanisms on the market are combined and welded by a steel plate and a shaft sleeve, and pores and sand holes also exist in the welding, which also has the above-mentioned leakage problem. SUMMARY

[0005] The technical problem to be solved by the utility model lies in providing a sealing structure of a tap changer operating mechanism in view of the above-mentioned problems.

[0006] The embodiment of the application is implemented as follows:

[0007] The embodiment of the application provides a sealing structure of a tap changer operating mechanism, characterized by comprising a welded flange, a mounting flange, a conical shaft sleeve and a shaft seal, the welded flange is welded at the top of a transformer tank cover, the mounting flange is arranged at the bottom of the operating mechanism and connected with the welded flange through bolts, the outer wall surface of the conical shaft sleeve is a conical surface, the conical shaft sleeve is sleeved on a main shaft and is in interference fit with the central conical hole of the mounting flange, and the shaft seal is arranged in the annular cavity between the conical shaft sleeve and the main shaft to block.

[0008] In some optional embodiments, the conical shaft sleeve is a positive conical structure with an increasing outer diameter from top to bottom, or a reverse conical structure with a decreasing outer diameter from top to bottom.

[0009] In some optional embodiments, the mounting flange and the conical shaft sleeve are connected in the circumferential direction through welding.

[0010] In some optional embodiments, the mounting flange and the conical shaft sleeve are axially positioned through a connecting piece.

[0011] In some alternative embodiments, the center taper hole of the mounting flange is welded to the outer wall of the taper sleeve relative to one side of the large end of the taper sleeve.

[0012] In some alternative embodiments, the connecting member is arranged at the small end of the taper sleeve, and the connecting member is a connecting nut, and the taper sleeve is provided with external threads and is screwed with the connecting nut.

[0013] In some alternative embodiments, the main shaft is provided with a shaft shoulder in the circumferential direction, and the shaft shoulder is arranged in axial positioning with the bottom end step portion of the taper sleeve.

[0014] In some alternative embodiments, the welding is spot welding, and a plurality of welds are distributed in the circumferential direction.

[0015] In some alternative embodiments, the welding is full welding, and an annular weld is formed.

[0016] In some alternative embodiments, a sealing ring is arranged between the contact surface of the welding flange and the mounting flange.

[0017] The beneficial effects of the present application are: the sealing structure of the tap changer operating mechanism provided by the present application is tapered fit between the mounting flange and the taper sleeve, and the taper interference is achieved by external pressure, so as to achieve the sealing effect. In the process of production and installation, air holes and sand holes are avoided, and the sealing effect of the operating mechanism is improved. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor.

[0019] Figure 1 It is a front view of an embodiment of the present application;

[0020] Figure 2 It is a welding schematic diagram of a taper sleeve with a positive taper structure of an embodiment of the present application;

[0021] Figure 3 It is a welding schematic diagram of a taper sleeve with an inverted taper structure of an embodiment of the present application;

[0022] Figure 4 It is a connecting nut mounting schematic diagram of a taper sleeve with a positive taper structure of an embodiment of the present application;

[0023] Figure 5The mounting diagram of the connecting nut of the inverted conical structure of the conical shaft sleeve of one embodiment of the present application;

[0024] Figure 6 The spot welding diagram of one embodiment of the present application;

[0025] Figure 7 The full welding diagram of one embodiment of the present application. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. The components of the embodiments of the present application described and shown in the drawings can be arranged and designed in various different configurations.

[0027] Therefore, the detailed description of the embodiments of the present application provided below in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without making creative efforts fall within the scope of protection of the present application.

[0028] It should be noted that: similar reference numerals and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0029] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly placed when the product of the present application is used, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third" and the like are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0030] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components must be absolutely horizontal or overhanging, but can be slightly inclined. For example, "horizontal" only means that its direction is relatively more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0031] In the description of the application, it also needs to be explained that, unless otherwise explicitly specified and limited, the terms "set", "install", "connect", "connect" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0032] In the present application, unless otherwise explicitly specified and limited, the first feature "on" or "under" the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "above" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0033] The features and performance of the application are further described in detail below in conjunction with the embodiments.

[0034] As shown in Figure 1 The utility model provides a sealing structure of tap switch operating mechanism, including welding flange 1, installation flange 2, conical shaft sleeve 3 and shaft seal 4, welding flange is welded in transformer tank cover 5 top, installation flange is located operating mechanism 6 bottom, is connected through bolt 7 with welding flange, conical shaft sleeve outer wall surface is the taper surface, conical shaft sleeve is sleeved in main shaft 8, and the center taper hole of installation flange is taper interference fit, and shaft seal is located in the annular cavity of conical shaft sleeve and main shaft and is sealed.

[0035] The main shaft is worn in the conical shaft sleeve, and the main shaft is sealed by the shaft seal to prevent the transformer oil from leaking out between the main shaft and the center taper hole of the conical shaft sleeve.

[0036] The conical shaft sleeve is sleeved in the center taper hole of the installation flange, and the outer circle of the conical shaft sleeve and the center taper hole of the installation flange are matching conical surfaces. The conical shaft sleeve is pressed into the center taper hole of the installation flange by the pressure applied from the outside, and the sealing effect is achieved by interference fit, preventing the transformer oil from leaking out between the center taper hole of the installation flange and the outer wall of the conical shaft sleeve.

[0037] The conical shaft sleeve can be a positive taper structure with increasing outer diameter from top to bottom, or a reverse taper structure with decreasing outer diameter from top to bottom.

[0038] In some alternative implementations, the mounting flange is circumferentially welded to the outer wall of the tapered bushing. The central tapered hole of the mounting flange is welded to the outer wall of the tapered bushing on one side relative to the large end of the tapered bushing.

[0039] like Figure 2 , Figure 3 As shown, when the tapered bushing has a positive tapered structure, the mounting flange is welded to the outer wall of the large end of the corresponding tapered bushing along the lower edge of the central tapered hole; when the tapered bushing has an inverted tapered structure, the mounting flange is welded to the outer wall of the large end of the corresponding tapered bushing along the upper edge of the central tapered hole.

[0040] In this embodiment, the welding may be spot welding (see...) Figure 6 Multiple welds 9 are distributed circumferentially.

[0041] In this embodiment, the welding is a full weld (see...). Figure 7 ), forming a circumferential weld 10.

[0042] In some alternative implementations, the mounting flange and the tapered bushing are axially positioned by a connector. The connector, which is a connecting nut 11, is installed at the small end of the tapered bushing and has external threads that screw into the connecting nut.

[0043] like Figure 4 , Figure 5 As shown, when the tapered bushing has a positive tapered structure, the connecting nut is installed at the top of the tapered bushing; the connecting nut is installed at the bottom of the tapered bushing.

[0044] The main shaft is provided with a shoulder 12 along the circumference, and the shoulder and the bottom step of the bushing are configured for further axial positioning.

[0045] In some alternative implementations, a sealing ring 13 is provided between the contact surfaces of the welding flange and the mounting flange.

[0046] The embodiments described above are some, but not all, of the embodiments of this application. The detailed description of the embodiments of this application is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

Claims

1. A sealing structure for a tap changer operating mechanism, characterized in that, The device includes a welding flange, a mounting flange, a tapered bushing, and a shaft seal. The welding flange is welded to the top of the transformer tank cover. The mounting flange is located at the bottom of the operating mechanism and is connected to the welding flange by bolts. The outer wall surface of the tapered bushing is tapered. The tapered bushing is sleeved on the main shaft and has an interference fit with the central tapered hole of the mounting flange. The shaft seal is located in the annular cavity between the tapered bushing and the main shaft for sealing.

2. The sealing structure of the tap changer operating mechanism according to claim 1, characterized in that, The tapered bushing is either a positive tapered structure with an increasing outer diameter from top to bottom, or an inverted tapered structure with a decreasing outer diameter from top to bottom.

3. The sealing structure of the tap changer operating mechanism according to claim 2, characterized in that, The mounting flange is welded circumferentially to the outer wall of the tapered bushing.

4. The sealing structure of the tap changer operating mechanism according to claim 2, characterized in that, The mounting flange and the tapered bushing are axially positioned by a connector.

5. The sealing structure of the tap changer operating mechanism according to claim 3, characterized in that, The central tapered hole of the mounting flange is welded to the outer wall of the tapered bushing on one side relative to the large end of the tapered bushing.

6. The sealing structure of the tap changer operating mechanism according to claim 4, characterized in that, The connector is installed at the small end of the tapered bushing. The connector is a connecting nut. The tapered bushing has an external thread that is screwed into the connecting nut.

7. The sealing structure of a tap changer operating mechanism according to claim 5 or 6, characterized in that, The main shaft is provided with a shoulder along the circumference, and the shoulder is configured to be axially positioned with the bottom step portion of the tapered bushing.

8. The sealing structure of the tap changer operating mechanism according to claim 5, characterized in that, The welding is spot welding, with multiple weld seams spaced apart circumferentially.

9. The sealing structure of the tap changer operating mechanism according to claim 5, characterized in that, The welding is a full weld, forming a circumferential weld.

10. The sealing structure of the tap changer operating mechanism according to claim 7, characterized in that, A sealing ring is provided between the contact surfaces of the welding flange and the mounting flange.

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