Universal docking device for vacuum pump and transformer

Abstract

The invention provides a vacuum pump and transformer universal butt joint device which comprises a butt joint pipe and a connecting assembly, one end of the butt joint pipe is provided with a first connecting flange, the other end of the butt joint pipe is provided with a butt joint part, the first connecting flange is suitable for being connected with a first flange connector in a vacuum pump, and the butt joint part is of a conical structure; the diameter of the butt joint part is gradually reduced from one end close to the first connecting flange to one end far away from the first connecting flange, and the outer wall of the butt joint part is suitable for abutting against a second flange interface on the transformer; one end of the connecting component is connected with the butting pipe, and the other end is suitable for being connected with a second flange interface on the transformer; and the second flange interfaces with different diameters are propped against the corresponding diameter parts of the butt joint part. According to the universal butt joint device for the vacuum pump and the transformer, butt joint can be achieved without reducing flange connectors of different specifications, and using and carrying are more convenient.

Description

Technical Field

[0001] The invention belongs to the technical field of connection equipment, and in particular relates to a universal docking device for a vacuum pump and a transformer. Background Art

[0002] Before using the oil-immersed transformer, it is necessary to use a vacuum pump to evacuate it. The main reasons for evacuating it are as follows: 1) Remove gas and moisture: The vacuum pump removes air, moisture and other gases inside the transformer by vacuuming to ensure that the transformer is in a vacuum state. This can avoid bubbles when injecting insulating oil, which will affect the insulation performance and operating stability of the transformer. Improve insulation performance: Through vacuum treatment, moisture inside the transformer can be removed and the insulating oil can be kept dry, thereby improving the insulation performance of the transformer and extending its service life.

[0003] 2) Prevent oil leakage: Vacuum treatment before injecting insulating oil can reduce the number of bubbles in the oil, thereby reducing oil leakage during transformer operation and ensuring the normal operation of the transformer.

[0004] ‌3) Improve vacuum stability‌: The function of the vacuum pump is to maintain the vacuum stability of the vacuum oil filter, ensuring that the vacuum degree will not drop or become unstable during the extraction process, thereby ensuring the vacuum oil filling effect of the transformer‌.

[0005] At present, when a vacuum pump is used to evacuate an oil-immersed transformer, the vacuum pump and the oil-immersed transformer are usually connected by a flange connection, and the flange can only be connected to flanges of the same specification.

[0006] However, in actual operation, it is necessary to evacuate oil-immersed transformers of different specifications, and the flanges of oil-immersed transformers of different specifications usually have different specifications. At this time, it is necessary to connect the flange interface of the vacuum pump and the flange interface of the oil-immersed transformer through a reducer flange joint. However, a reducer flange joint of one specification can only be connected to a flange interface of one specification. Therefore, if you want to connect the vacuum pump to the flange interfaces of oil-immersed transformers of different specifications, you need to carry a variety of reducer flange interfaces of different specifications, which is inconvenient to use and carry. Summary of the invention

[0007] The invention provides a universal docking device for a vacuum pump and a transformer, aiming to solve the technical problem in the prior art that a vacuum pump needs to be docked with flange interfaces on oil-immersed transformers of various specifications through reducer flange interfaces of various specifications.

[0008] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: to provide a universal docking device for a vacuum pump and a transformer, comprising a docking tube and a connecting assembly, wherein a first connecting flange is provided at one end of the docking tube, and a docking portion is provided at the other end, wherein the first connecting flange is suitable for connecting with a first flange interface on a vacuum pump, the docking portion is in a conical structure, and the diameter of the docking portion gradually decreases from an end close to the first connecting flange to an end away from the first connecting flange, and an outer wall of the docking portion is suitable for abutting with a second flange interface on a transformer; one end of the connecting assembly is connected to the docking tube, and the other end is suitable for connecting with the second flange interface on the transformer; wherein second flange interfaces of different diameters abut with corresponding diameter portions of the docking portion.

[0009] In a possible implementation of the universal docking device for a vacuum pump and a transformer provided by the present invention, a second connecting flange is provided between the first connecting flange and the docking portion, the second connecting flange is connected to the docking tube, and the connecting assembly is connected to the second connecting flange.

[0010] In a possible implementation of the universal docking device for a vacuum pump and a transformer provided by the present invention, the connecting assembly includes a plurality of telescopic rods, which are arranged at intervals around the docking portion, one end of the telescopic rod is connected to the second connecting flange, and the other end is suitable for connection to the second connecting flange.

[0011] In a possible implementation of the universal docking device for a vacuum pump and a transformer provided by the present invention, the telescopic rod includes a first hook rod, a second hook rod and a threaded tube, the first hook rod and the second hook rod are respectively arranged at two ends of the threaded tube, one end of the first hook rod is hooked on the second connecting flange, and the other end is threadedly matched with the threaded tube, one end of the second hook rod is threadedly matched with the threaded tube, and the other end is suitable for hooking on the second flange interface.

[0012] In a possible implementation of the universal docking device for a vacuum pump and a transformer provided by the present invention, the connection assembly further includes a limiting ring, the limiting ring is provided with a plurality of limiting holes, and the threaded tube is inserted into the limiting holes.

[0013] In a possible implementation of the universal docking device for a vacuum pump and a transformer provided by the present invention, the connecting assembly also includes a driving ring, teeth are provided on the outer side of the threaded tube, the driving ring is arranged on one side of the limiting ring and rotatably cooperates with the limiting ring, and driving teeth are provided on the circumference of the driving ring, and the driving teeth on the driving ring mesh with the teeth on the threaded tube.

[0014] In a possible implementation of the universal docking device for a vacuum pump and a transformer provided by the present invention, the docking tube also includes a connecting portion, which is arranged between the first connecting flange and the docking portion, and the diameter of the connecting portion gradually increases from one side of the first connecting flange to one side of the docking portion.

[0015] In a possible implementation of the universal docking device for a vacuum pump and a transformer provided by the present invention, a sealing gasket is sleeved on the outer side of the docking portion, and the sealing gasket is suitable for abutting against the second flange interface on the transformer.

[0016] In a possible implementation of the universal docking device for a vacuum pump and a transformer provided by the present invention, the sealing gasket is composed of a plurality of annular capsules connected in sequence, a channel is provided on the docking tube, the channel is suitable for being connected to an air source, a plurality of air holes are provided on the channel, the plurality of air holes correspond one-to-one to the annular capsules and are connected to the annular capsules, a connecting rod and a leather plug are provided in each of the annular capsules, one end of the connecting rod is connected to the top of the annular capsule, and the other end is connected to the leather plug, the leather plug is placed in the channel, and is suitable for sealing with the air hole to block the air hole.

[0017] In a possible implementation of the universal docking device for a vacuum pump and a transformer provided by the present invention, the leather plug includes a fixed half-plug, a movable half-plug and a connecting rod, the fixed half-plug is connected to the connecting rod, the movable half-plug is rotatably matched with the fixed half-plug, and has the freedom to rotate and reset to the side facing away from the connecting rod, one end of the connecting rod is connected to the movable half-plug, and the other end is placed on the side of the fixed half-plug on the upper adjacent leather plug facing away from the connecting rod, and the connecting rod is suitable for pressing the leather plug located on the upper side of the two adjacent leather plugs to drive the movable half-plug of the leather plug on the lower side to rotate, thereby opening the vent.

[0018] The beneficial effects of the universal docking device for a vacuum pump and a transformer provided by the present invention are as follows: compared with the prior art, the universal docking device for a vacuum pump and a transformer provided by the present invention, when using a vacuum pump to evacuate the transformer, inserts the docking portion on the docking tube into the second flange interface of the transformer, and then connects the docking tube and the transformer together through a connecting assembly; thereafter, the first connecting flange on the docking tube is connected to the first flange interface of the vacuum pump, thereby completing the docking of the vacuum pump and the transformer; and because the docking portion is a conical structure, parts of different diameters on the docking portion can abut against second flange interfaces of different calibers on the transformer, and then the docking tube and the transformer are connected together through a connecting assembly, thereby completing the docking of the docking tube and the transformer; therefore, the universal docking device for a vacuum pump and a transformer provided by the present invention can be directly docked with the second flange interfaces of transformers of different specifications, without the need to achieve docking through reducer flange interfaces of different specifications, and has good universality, and is more convenient to use and carry. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic diagram of the three-dimensional structure of a universal docking device for a vacuum pump and a transformer provided in an embodiment of the present invention; Figure 2 A schematic diagram of the main structure of a universal docking device for a vacuum pump and a transformer provided in an embodiment of the present invention; Figure 3 For along Figure 2 The cross-sectional structure diagram along the AA line; Figure 4 for Figure 3 A magnified view of part B in FIG. Description of reference numerals: 10. Butt pipe; 11. First connecting flange; 12. Connecting part; 13. Second connecting flange; 14. docking portion; 141. channel; 142. vent hole; 21. first hook rod; 22. threaded tube; 23. second hook rod; 24. limiting ring; 25. driving ring; 30. sealing pad; 31. annular capsule; 32, connecting rod; 331, fixed half plug; 332, movable half plug; 333, connecting rod; 40. First flange interface; 50. Second flange interface. DETAILED DESCRIPTION

[0020] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0021] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0022] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0023] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the application. Meanwhile, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to actual proportional relationships. The technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0024] In the description of the present application, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present application; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0025] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" may include both "above" and "below". The device may also be positioned in other different ways, and the spatially relative descriptions used here are interpreted accordingly.

[0026] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of this application.

[0027] The universal docking device for the vacuum pump and the transformer provided by the present invention is now described.

[0028] Embodiment 1: Please also read Figure 1 to Figure 2 The universal docking device for the vacuum pump and the transformer comprises a docking tube 10 and a connecting assembly. A first connecting flange 11 is provided at one end of the docking tube 10, and a docking portion 14 is provided at the other end. The first connecting flange 11 is suitable for connecting with a first flange interface 40 on the vacuum pump. The docking portion 14 is a conical structure, and the diameter of the docking portion 14 gradually decreases from one end close to the first connecting flange 11 to the end away from the first connecting flange 11. The outer wall of the docking portion 14 is suitable for abutting with a second flange interface 50 on the transformer.

[0029] One end of the connection assembly is connected to the butt-joint pipe 10, and the other end is suitable for connecting to the second flange interface 50 on the transformer.

[0030] The second flange interface 50 with different diameters abuts against a corresponding diameter portion of the docking portion 14 .

[0031] like Figure 1 and Figure 2 As shown, in a specific implementation manner of the universal docking device for a vacuum pump and a transformer provided in an embodiment of the present invention, a second connecting flange 13 is provided between the first connecting flange 11 and the docking portion 14, the second connecting flange 13 is connected to the docking pipe 10, and the connecting assembly is connected to the second connecting flange 13.

[0032] It should be noted that, by providing the second connection flange 13 on the butt-joint pipe 10 , the convenience of connecting the butt-joint pipe 10 to the transformer can be effectively improved.

[0033] like Figure 1 and Figure 2 As shown, in a specific implementation manner of the universal docking device for a vacuum pump and a transformer provided in an embodiment of the present invention, the connecting assembly includes a plurality of telescopic rods, and the plurality of telescopic rods are arranged at intervals around the docking portion 14, one end of the telescopic rod is connected to the second connecting flange 13, and the other end is suitable for connection to the second connecting flange 13.

[0034] Specifically, Figure 1 and Figure 3 As shown, in a specific implementation manner of the universal docking device for a vacuum pump and a transformer provided in an embodiment of the present invention, the telescopic rod includes a first hook rod 21, a second hook rod 23 and a threaded tube 22, the first hook rod 21 and the second hook rod 23 are respectively arranged at both ends of the threaded tube 22, one end of the first hook rod 21 is hooked on the second connecting flange 13, and the other end is threadedly matched with the threaded tube 22, one end of the second hook rod 23 is threadedly matched with the threaded tube 22, and the other end is suitable for hooking on the second flange interface 50.

[0035] It should be noted that the use of hooks to connect with the vacuum pump and the transformer makes installation and disassembly more convenient.

[0036] When in use, the first hook rod 21 and the second hook rod 23 are hooked onto the butt joint pipe 10 and the transformer respectively, and then the threaded tube 22 is rotated to make the first hook rod 21 and the second hook rod 23 move toward each other, so that the butt joint portion 14 on the butt joint pipe 10 is tightly abutted against the second flange interface 50 of the transformer, thereby completing the butt joint between the butt joint pipe 10 and the transformer.

[0037] The beneficial effect of the universal docking device for a vacuum pump and a transformer provided by the present invention is that compared with the prior art, the universal docking device for a vacuum pump and a transformer provided by the present invention, when using a vacuum pump to evacuate the transformer, inserts the docking portion 14 on the docking tube 10 into the second flange interface 50 of the transformer, and then connects the docking tube 10 and the transformer together through the connecting assembly.

[0038] Afterwards, the first connecting flange 11 on the butt-joint pipe 10 is connected to the first flange interface 40 of the vacuum pump, thereby completing the butt-joint connection between the vacuum pump and the transformer.

[0039] And because the docking portion 14 is a conical structure, parts of different diameters on the docking portion 14 can abut against second flange interfaces 50 of different diameters on the transformer, and then the docking tube 10 and the transformer are connected together through a connecting assembly to complete the docking of the docking tube 10 and the transformer.

[0040] Therefore, the universal docking device for the vacuum pump and the transformer provided by the present invention can be directly docked with the second flange interface 50 of transformers of different specifications without the need to achieve docking through reducer flange interfaces of different specifications. It has good universality and is more convenient to use and carry.

[0041] Embodiment 2: Please also read Figures 1 to 4 The universal docking device for the vacuum pump and the transformer comprises a docking tube 10 and a connecting assembly. A first connecting flange 11 is provided at one end of the docking tube 10, and a docking portion 14 is provided at the other end. The first connecting flange 11 is suitable for connecting with a first flange interface 40 on the vacuum pump. The docking portion 14 is a conical structure, and the diameter of the docking portion 14 gradually decreases from one end close to the first connecting flange 11 to the end away from the first connecting flange 11. The outer wall of the docking portion 14 is suitable for abutting with a second flange interface 50 on the transformer.

[0042] One end of the connection assembly is connected to the butt-joint pipe 10, and the other end is suitable for connecting to the second flange interface 50 on the transformer.

[0043] The second flange interface 50 with different diameters abuts against a corresponding diameter portion of the docking portion 14 .

[0044] like Figure 1 and Figure 2 As shown, in a specific implementation manner of the universal docking device for a vacuum pump and a transformer provided in an embodiment of the present invention, a second connecting flange 13 is provided between the first connecting flange 11 and the docking portion 14, the second connecting flange 13 is connected to the docking pipe 10, and the connecting assembly is connected to the second connecting flange 13.

[0045] It should be noted that, by providing the second connection flange 13 on the butt-joint pipe 10 , the convenience of connecting the butt-joint pipe 10 to the transformer can be effectively improved.

[0046] like Figure 1 and Figure 2 As shown, in a specific implementation manner of the universal docking device for a vacuum pump and a transformer provided in an embodiment of the present invention, the connecting assembly includes a plurality of telescopic rods, and the plurality of telescopic rods are arranged at intervals around the docking portion 14, one end of the telescopic rod is connected to the second connecting flange 13, and the other end is suitable for connection to the second connecting flange 13.

[0047] Specifically, Figure 1 and Figure 3As shown, in a specific implementation manner of the universal docking device for a vacuum pump and a transformer provided in an embodiment of the present invention, the telescopic rod includes a first hook rod 21, a second hook rod 23 and a threaded tube 22, the first hook rod 21 and the second hook rod 23 are respectively arranged at both ends of the threaded tube 22, one end of the first hook rod 21 is hooked on the second connecting flange 13, and the other end is threadedly matched with the threaded tube 22, one end of the second hook rod 23 is threadedly matched with the threaded tube 22, and the other end is suitable for hooking on the second flange interface 50.

[0048] It should be noted that the use of hooks to connect with the vacuum pump and the transformer makes installation and disassembly more convenient.

[0049] When in use, the first hook rod 21 and the second hook rod 23 are hooked onto the butt joint pipe 10 and the transformer respectively, and then the threaded tube 22 is rotated to make the first hook rod 21 and the second hook rod 23 move toward each other, so that the butt joint portion 14 on the butt joint pipe 10 is tightly abutted against the second flange interface 50 of the transformer, thereby completing the butt joint between the butt joint pipe 10 and the transformer.

[0050] like Figure 1 and Figure 3 As shown, in a specific implementation of the universal docking device for a vacuum pump and a transformer provided in an embodiment of the present invention, the connecting assembly further includes a limiting ring 24, a plurality of limiting holes are formed on the limiting ring 24, and the threaded tube 22 is passed through the limiting holes.

[0051] It should be noted that all the threaded tubes 22 pass through the limiting ring 24, so that moving the limiting ring 24 can drive all the telescopic rods to rotate, adjust the opening size to match the second flange interface 50 on the transformer, and hook all the telescopic rods on the second flange interface 50 on the transformer at one time, making installation more convenient and improving disassembly and assembly efficiency.

[0052] Further, such as Figure 1 and Figure 3 As shown, in a specific implementation manner of the universal docking device for a vacuum pump and a transformer provided in an embodiment of the present invention, the connecting assembly further comprises a driving ring 25, teeth are arranged on the outer side of the threaded tube 22, the driving ring 25 is arranged on one side of the limiting ring 24, and is rotatably matched with the limiting ring 24, and driving teeth are arranged around the driving ring 25, and the driving teeth on the driving ring 25 are meshed with the teeth on the threaded tube 22.

[0053] It should be noted that by rotating the drive ring 25, the threaded tubes 22 on all telescopic rods can be driven to rotate simultaneously through the meshing of the drive teeth with the teeth, thereby controlling all telescopic rods to extend or shorten at the same time, greatly improving the efficiency of assembly and disassembly.

[0054] like Figure 1 and Figure 2As shown, in a specific implementation manner of the universal docking device for a vacuum pump and a transformer provided in an embodiment of the present invention, the docking pipe 10 also includes a connecting portion 12, which is arranged between the first connecting flange 11 and the docking portion 14, and the diameter of the connecting portion 12 gradually increases from one side of the first connecting flange 11 to the other side of the docking portion 14.

[0055] It should be noted that, by providing the connecting portion 12, the maximum diameter of the butt joint 10 is increased, thereby increasing the maximum diameter of the butt joint 14 and increasing the adaptability range of the butt joint device.

[0056] like Figure 3 and Figure 4 As shown, in a specific implementation of the universal docking device for a vacuum pump and a transformer provided in an embodiment of the present invention, a sealing gasket 30 is sleeved on the outer side of the docking portion 14, and the sealing gasket 30 is suitable for abutting against the second flange interface 50 on the transformer, thereby improving the sealing performance of the docking tube 10 and the second flange interface 50 on the transformer.

[0057] Specifically, Figure 3 and Figure 4 As shown, in a specific implementation of the universal docking device for a vacuum pump and a transformer provided in an embodiment of the present invention, the sealing gasket 30 is composed of a plurality of annular capsules 31 connected in sequence, a hole 141 is provided on the docking tube 10, the hole 141 is suitable for connecting with an air source, a plurality of ventilation holes 142 are provided on the hole 141, and the plurality of ventilation holes 142 correspond one-to-one to the annular capsules 31 and are connected with the annular capsules 31.

[0058] Each annular capsule 31 is provided with a connecting rod 32 and a leather plug. One end of the connecting rod 32 is connected to the top of the annular capsule 31 , and the other end is connected to the leather plug. The leather plug is placed in the channel 141 and is suitable for sealing with the vent hole 142 to block the vent hole 142 .

[0059] Further, such as Figure 4 As shown, in a specific implementation of the universal docking device for a vacuum pump and a transformer provided in an embodiment of the present invention, the leather plug includes a fixed half plug 331, a movable half plug 332 and a linkage rod 333. The fixed half plug 331 is connected to the linkage rod 32, and the movable half plug 332 is rotatably matched with the fixed half plug 331, and has the freedom to rotate and reset to the side facing away from the linkage rod 32. One end of the linkage rod 333 is connected to the movable half plug 332, and the other end is placed on the side of the fixed half plug 331 on the upper adjacent leather plug facing away from the linkage rod 32. The linkage rod 333 is suitable for pressing the upper leather plug of the two adjacent leather plugs to drive the movable half plug 332 of the lower leather plug to rotate and open the vent 142.

[0060] Specifically, the annular capsule 31 has a certain degree of support. Under normal conditions, the annular capsule 31 pulls the connecting rod 32 to seal the leather plug with the vent hole 142 , and gas cannot enter the annular capsule 31 .

[0061] In order to further improve the stability of the sealing fit between the leather plug and the vent hole 142, a spring may be provided in the annular capsule 31 to provide sufficient pulling force to pull the leather plug so that there is sufficient pressure between the leather plug and the inner wall of the hole 141 to maintain the sealing fit.

[0062] When the spring is used, the spring is sleeved on the connecting rod 32 , one end of the spring is connected to the docking portion 14 , and the other end is connected to the top of the annular capsule 31 .

[0063] More specifically, the fixed half-plug 331 and the movable half-plug 332 are an integrated structure, made of materials suitable for use as seals, such as rubber and silicone. The movable half-plug 332 is connected to the fixed half-plug 331 through a homogeneous material of a certain thickness, and relies on the material's own toughness to achieve rebound and reset.

[0064] It should be noted that an air inlet connected to the hole 141 is provided on the butt joint pipe 10; during operation, the air inlet is connected to the air source, and the butt joint pipe 10 is connected to the transformer. At this time, one of the annular capsules 31 is pressed against the second flange interface 50 of the transformer, and the annular capsule 31 is squeezed and deformed, and then moves downward through the connecting rod 32 and the leather plug, opening the air vent corresponding to the annular capsule 31, allowing gas to enter the annular capsule 31, forming high pressure in the annular capsule 31, causing the annular capsule 31 to expand, increasing the contact area with the second flange interface 50 of the transformer, and improving the sealing performance.

[0065] At the same time, the downwardly moving leather plug drives the connecting rod 333 on the leather plug on the annular capsule 31 on the lower side (i.e., the annular capsule 31 located in the second flange interface 50 and adjacent to the annular capsule 31 squeezed by the edge of the second flange interface 50) to move downward, and the connecting rod 333 then drives the movable half plug 332 on the leather plug to flip downward, opening the vent 142, allowing gas to enter the annular capsule 31, causing the annular capsule 31 to expand and abut against the inner wall of the second flange interface 50 of the transformer, further increasing the contact area, thereby further improving the sealing performance.

[0066] Compared with making the sealing gasket 30 into a whole capsule, dividing it into multiple annular capsules 31, when in use, only two of the annular capsules 31 are inflated specifically, so as to achieve the effect of improving the sealing performance. The required inflation volume is smaller, the inflation and deflation are faster, the annular capsules 31 are easier to reach high pressure, and the waste of resources can also be reduced.

[0067] The beneficial effect of the universal docking device for a vacuum pump and a transformer provided by the present invention is that compared with the prior art, the universal docking device for a vacuum pump and a transformer provided by the present invention, when using a vacuum pump to evacuate the transformer, inserts the docking portion 14 on the docking tube 10 into the second flange interface 50 of the transformer, and then connects the docking tube 10 and the transformer together through the connecting assembly.

[0068] Afterwards, the first connecting flange 11 on the butt-joint pipe 10 is connected to the first flange interface 40 of the vacuum pump, thereby completing the butt-joint connection between the vacuum pump and the transformer.

[0069] And because the docking portion 14 is a conical structure, parts of different diameters on the docking portion 14 can abut against second flange interfaces 50 of different diameters on the transformer, and then the docking tube 10 and the transformer are connected together through a connecting assembly to complete the docking of the docking tube 10 and the transformer.

[0070] Therefore, the universal docking device for the vacuum pump and the transformer provided by the present invention can be directly docked with the second flange interface 50 of transformers of different specifications without the need to achieve docking through reducer flange interfaces of different specifications. It has good universality and is more convenient to use and carry.

[0071] In addition, a sealing gasket composed of a plurality of annular capsules 31 is arranged on the surface of the docking portion 14, which can effectively ensure the sealing after docking and ensure the vacuuming effect.

[0072] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A universal docking device for a vacuum pump and a transformer, characterized in that: It comprises a butt joint tube and a connection assembly, wherein one end of the butt joint tube is provided with a first connection flange, and the other end is provided with a butt joint portion, wherein the first connection flange is suitable for being connected to a first flange interface on a vacuum pump, the butt joint portion is in a conical structure, and the diameter of the butt joint portion gradually decreases from an end close to the first connection flange to an end far from the first connection flange, and the outer wall of the butt joint portion is suitable for abutting against a second flange interface on a transformer; one end of the connection assembly is connected to the butt joint tube, and the other end is suitable for being connected to the second flange interface on the transformer; wherein second flange interfaces of different diameters abut against corresponding diameter portions of the butt joint portion.

2. The universal docking device for a vacuum pump and a transformer according to claim 1, characterized in that: A second connecting flange is provided between the first connecting flange and the butting portion, the second connecting flange is connected to the butting pipe, and the connecting assembly is connected to the second connecting flange.

3. The universal docking device for a vacuum pump and a transformer according to claim 2, characterized in that: The connection assembly includes a plurality of telescopic rods, which are arranged at intervals around the docking portion. One end of the telescopic rod is connected to the second connection flange, and the other end is suitable for connection with the second connection flange.

4. The universal docking device for a vacuum pump and a transformer as claimed in claim 3, characterized in that: The telescopic rod includes a first hook rod, a second hook rod and a threaded tube. The first hook rod and the second hook rod are respectively arranged at two ends of the threaded tube. One end of the first hook rod is hooked on the second connecting flange, and the other end is threadedly matched with the threaded tube. One end of the second hook rod is threadedly matched with the threaded tube, and the other end is suitable for hooking on the second flange interface.

5. The universal docking device for a vacuum pump and a transformer as claimed in claim 4, characterized in that: The connection assembly further comprises a limiting ring, a plurality of limiting holes are formed on the limiting ring, and the threaded tube is passed through the limiting holes.

6. The universal docking device for a vacuum pump and a transformer as claimed in claim 5, characterized in that: The connecting assembly also includes a driving ring, the outer side of the threaded tube is provided with teeth, the driving ring is arranged on one side of the limiting ring and rotatably cooperates with the limiting ring, the driving ring is provided with driving teeth around the circumference, and the driving teeth on the driving ring are meshed with the teeth on the threaded tube.

7. The universal docking device for a vacuum pump and a transformer according to claim 1, characterized in that: The butt joint pipe further includes a connecting portion, which is disposed between the first connecting flange and the butt joint portion, and a diameter of the connecting portion gradually increases from a side of the first connecting flange to a side of the butt joint portion.

8. The universal docking device for a vacuum pump and a transformer according to claim 1, characterized in that: A sealing gasket is sleeved on the outer side of the butt joint, and the sealing gasket is suitable for abutting against the second flange interface on the transformer.

9. The universal docking device for a vacuum pump and a transformer according to claim 8, characterized in that: The sealing gasket is composed of a plurality of annular sacs connected in sequence, a channel is opened on the butt tube, the channel is suitable for connecting with an air source, a plurality of air holes are opened on the channel, the plurality of air holes correspond to the annular sacs one by one and are connected with the annular sacs, a connecting rod and a leather plug are provided in each of the annular sacs, one end of the connecting rod is connected to the top of the annular sac, and the other end is connected to the leather plug, the leather plug is placed in the channel, suitable for sealing with the air hole to block the air hole.

10. The universal docking device for a vacuum pump and a transformer according to claim 9, characterized in that: The leather plug includes a fixed half-plug, a movable half-plug and a connecting rod. The fixed half-plug is connected to the connecting rod. The movable half-plug rotates with the fixed half-plug and has the freedom to rotate and reset to the side facing away from the connecting rod. One end of the connecting rod is connected to the movable half-plug, and the other end is placed on the side of the fixed half-plug on the upper adjacent leather plug facing away from the connecting rod. The connecting rod is suitable for pressing the leather plug located on the upper side of the two adjacent leather plugs to drive the movable half-plug of the leather plug on the lower side to rotate, thereby opening the vent.

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