Insulating paste injection device for transformer bushing

Abstract

The utility model discloses a transformer bushing insulating paste injection device, which belongs to the technical field of transformer equipment, and comprises a paste injection device and a connecting mechanism, the connecting mechanism is arranged between a bushing and the paste injection device, the connecting mechanism comprises a connecting cylinder and an air exchange assembly, the air exchange assembly is arranged on the connecting cylinder, and the connecting cylinder is connected with the connecting cylinder. The connecting cylinder comprises an upper connecting part and a trumpet-shaped connecting seat, the upper end of the upper connecting part is connected with the paste injector, the lower end of the connecting part is connected with the trumpet-shaped connecting seat, a plug cylinder is installed on the inner wall of the trumpet-shaped connecting seat, and the plug cylinder can be inserted into the sleeve; the inner wall of the trumpet-shaped connecting seat is provided with an annular groove capable of being matched with a flange of a sleeve, the lower end of the trumpet-shaped connecting seat is provided with two vertical openings which are symmetrical along the axis of the plug barrel, and the outer end face of the trumpet-shaped connecting seat is provided with a connecting buckle.

Description

TECHNICAL FIELD

[0001] The utility model relates to transformer equipment technical field, concretely relates to a transformer bushing insulating paste injection device. BACKGROUND

[0002] The existing transformer bushing oil injection or paste injection device, in order to avoid the moisture into the bushing when injecting oil and cause the insulation performance to drop, usually injects the inert gas with the density greater than air into the bushing when injecting oil, extrudes the air in the transformer again and injects the paste or oil into the bushing, to reach the effect of isolating moisture.

[0003] In order to make the inert gas fill the whole bushing and extrude the original air in the bushing smoothly, the device for filling the gas into the bushing must be sealed with the end of the bushing, only leaving a one-way exhaust hole;

[0004] The existing device is connected with the bushing by setting the annular mounting groove in the connecting part, the connecting part is sleeved on the upper end of the bushing, and the flange of the bushing is clamped in the annular mounting groove, so that the sealing and the fixation of the device are realized. This connection mode is inconvenient to install and disassemble, and the connecting part will also be deformed by external force for a long time, resulting in shaking and loose sealing after connection, which affects the exhaust effect.

[0005] In view of the problems existing in the prior art, the utility model designs and manufactures a transformer bushing insulating paste injection device to overcome the above defects. CONTENT OF THE UTILITY MODEL

[0006] For the problems existing in the prior art, the utility model provides a transformer bushing insulating paste injection device, which can realize quick connection and disassembly with the bushing and improve the maintenance efficiency.

[0007] In order to realize the above purpose, the utility model adopts the following technical scheme: a transformer bushing insulating paste injection device, comprising a paste injector and a connecting mechanism, the connecting mechanism is installed between the bushing and the paste injector, the connecting mechanism seals and connects the bushing and the paste injector together;

[0008] The connecting mechanism comprises a connecting barrel and a gas exchange assembly capable of replacing the air in the bushing with inert gas, the gas exchange assembly is installed on the connecting barrel, the connecting barrel comprises an upper connecting part and a horn-shaped connecting seat, the upper end of the upper connecting part is connected with the paste injector, and the lower end of the connecting part is connected with the horn-shaped connecting seat.

[0009] The inner wall of the horn-shaped connecting seat is provided with a plug barrel which can be inserted into the sleeve and tightly abut against the inner wall of the sleeve, and the inner wall of the horn-shaped connecting seat is provided with an annular groove which can cooperate with the flange of the sleeve, and the lower end of the horn-shaped connecting seat is provided with two vertical openings which are symmetrical to the axis of the plug barrel, and the two vertical openings divide the horn-shaped connecting seat into two semicircular parts, and the outer end surface of the horn-shaped connecting seat is provided with a connecting buckle which can tighten the two semicircular parts to the axis direction of the connecting barrel.

[0010] Preferably, the annular groove is located below the plug barrel.

[0011] Preferably, the inner wall of the horn-shaped connecting seat is provided with a fixing ring, the lower end surface of the fixing ring is fixedly connected with the plug barrel, and the fixing ring is coincident with the axis of the plug barrel.

[0012] Preferably, the fixing ring is located above the vertical opening.

[0013] Preferably, the inner diameter of the plug barrel is equal to the inner diameter of the fixing ring, and the outer diameter of the plug barrel is smaller than the outer diameter of the fixing ring.

[0014] The plug barrel is provided with a sealing gasket, and the sleeve can abut the sealing gasket against one side of the fixing ring close to the plug barrel.

[0015] Preferably, the air exchange assembly comprises a one-way exhaust valve and an air inlet interface connected with an air source, the air inlet interface and the one-way exhaust valve are both mounted on the upper connecting part, and the height of the air inlet interface is lower than the height of the one-way exhaust valve.

[0016] Preferably, the grease injector comprises a butter pump and a grease injection pipe, the upper end of the grease injection pipe is connected with the butter pump, and the lower end of the grease injection pipe can be inserted into the connecting barrel.

[0017] Preferably, the outer wall of the grease injection pipe is provided with a sealing flange, and the sealing flange is fixed to the upper end of the upper connecting part.

[0018] Preferably, the grease injection pipe is provided with a liquid level sensor for monitoring the liquid level of the insulating grease in the sleeve.

[0019] Preferably, the horn-shaped connecting seat is made of elastic material.

[0020] The beneficial effects of the utility model lie in that:

[0021] 1. The utility model discloses a vertical opening is arranged on the connecting barrel to divide the horn-shaped connecting seat into two semicircular parts, which can more easily insert the flange of the sleeve into the annular groove and fix, realize the quick connection and disassembly with the sleeve, and the vertical opening can greatly reduce the deformation amount during connection and prolong the service life of the extension device.

[0022] 2. The utility model installs a fixing ring and a plug tube on the trumpet-shaped connecting seat, and sets a sealing gasket on the outer wall of the plug tube. The plug tube is inserted into the inside of the sleeve to prevent the connecting tube from shaking on the sleeve, thereby improving the reliability of the connection. The fixing ring can also play a role in limiting the installation of the sleeve. During the connection process, the sealing gasket is pressed between the two to ensure the airtightness of the connection.

[0023] 3. A one-way exhaust valve and an air inlet interface for connecting to an air source are provided on the connecting tube of the utility model. Before injecting the paste, an inert gas with a density greater than that of air is introduced into the casing to squeeze out all the air in the casing from the one-way exhaust valve. Then the paste is injected to prevent moisture from mixing in and affecting the insulation effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Fig. 1 This is a cross-sectional view of a transformer bushing insulating paste injection device according to the utility model;

[0025] Fig. 2 This is a side view of a transformer bushing insulating paste injection device according to the utility model;

[0026] Fig. 3 The utility model is a schematic diagram of the working state of a transformer bushing insulating paste injection device.

[0027] In the figure: 1- grease pump, 2- grease injection tube, 3- sealing flange, 4- air inlet interface, 5- fixing ring, 6- plug cylinder, 7- ring groove, 8- connecting buckle, 9- vertical opening, 10- trumpet-shaped connecting seat, 11- sealing gasket, 12- one-way exhaust valve, 13- upper connecting part, 14- sleeve flange, 15- semicircular part. DETAILED DESCRIPTION

[0028] In order to facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0029] like Figs. 1-3 The transformer bushing insulating paste injection device shown includes an injector and a connecting mechanism. The connecting mechanism is installed between the bushing and the injector. The connecting mechanism seals the bushing and the injector together. The injector injects the insulating paste, which then enters the bushing along the connecting mechanism to complete the injection operation.

[0030] The utility model comprises a grease injector 1 and a grease injector tube 2. The upper end of the grease injector tube 2 is connected to the grease pump 1, and the lower end of the grease injector tube 2 can be inserted into the connecting tube. A sealing flange 3 is provided on the outer wall of the grease injector tube 2, and the sealing flange 3 is fixed to the upper end of the upper connecting portion 13. This allows the grease injector to be sealed with the connecting mechanism to prevent moisture from entering and affecting the insulating effect of the insulating paste.

[0031] Specifically, the paste injection pipe 2 is provided with a liquid level sensor for monitoring the internal insulation paste level of the sleeve.

[0032] The utility model discloses connecting mechanism includes the connecting barrel and can be the air in sleeve with the inert gas of replacement replacement air component, and replacement air component installs connecting barrel, and replacement air component includes one way exhaust valve 12 and the air inlet of connecting gas source 4, and air inlet 4 and one way exhaust valve 12 all install on upper connecting portion 13.

[0033] Specifically, the height of the air inlet 4 is lower than the height of the one-way exhaust valve 12. The inert gas introduced from the air inlet 4 will sink and push the air to the upper layer during the aeration process due to its higher density than air. The inert gas will continuously squeeze the air to the one-way exhaust valve 12 for discharge until the sleeve is fully filled with inert gas. Then, the insulation paste is injected into the sleeve to avoid moisture mixing and affecting the insulation effect.

[0034] Specifically, the connecting barrel includes an upper connecting portion 13 and a horn-shaped connecting seat 10. The upper end of the upper connecting portion 13 is connected with the paste injector, and the lower end of the connecting portion is connected with the horn-shaped connecting seat 10.

[0035] The utility model discloses that the inner wall of horn-shaped connecting seat 10 is provided with a plug barrel 6. The plug barrel 6 can be inserted into the sleeve and tightly abut against the inner wall of the sleeve. During the paste injection, the plug barrel 6 can fix the entire connecting barrel, avoiding the device from falling off or the sealing from being not tight due to the shaking of the connecting barrel.

[0036] The inner wall of the horn-shaped connecting seat 10 is provided with a fixing ring 5. The lower end surface of the fixing ring 5 is fixedly connected with the plug barrel 6, and the axis of the fixing ring 5 coincides with that of the plug barrel 6. The inner diameter of the plug barrel 6 is equal to that of the fixing ring 5, and the outer diameter of the plug barrel 6 is smaller than that of the fixing ring 5. A sealing gasket 11 is sleeved on the plug barrel 6.

[0037] Specifically, the sleeve can abut the sealing gasket 11 against one side of the fixing ring 5 close to the plug barrel 6. The fixing ring 5 can limit the depth of the plug barrel 6 inserted into the sleeve. Meanwhile, the addition of the sealing gasket 11 can ensure the air tightness of the connection between the connecting barrel and the sleeve, avoiding the injection of moisture during the paste injection.

[0038] The inner wall of the horn-shaped connecting seat 10 is provided with a ring groove 7 that can cooperate with the sleeve flange 14. The sleeve can be clamped in the ring groove 7. Since the ring groove 7 is located below the plug barrel 6 and both are arranged on the horn-shaped connecting seat 10, when the ring groove 7 is sleeved on the sleeve flange 14, it will limit the up-and-down movement of the horn-shaped connecting seat 10. Since the plug barrel 6 is installed on the horn-shaped connecting seat 10 and both are linked, the relative movement between the plug barrel 6 and the sleeve is also limited. The sealing gasket 11 on the plug barrel 6 can always abut against the sleeve, ensuring the sealing effect of the connection between the connecting barrel and the sleeve.

[0039] The utility model discloses a horn -shaped connecting seat 10 lower end is equipped with two along plug-in barrel 6 axial symmetry's vertical opening 9, and fixed ring 5 is located vertical opening 9 top. Two vertical openings 9 will horn -shaped connecting seat 10 divide into two semicircular parts 15, and horn -shaped connecting seat 10 is made of elastic material. The horn -shaped connecting seat 10 outer end face installs the connecting buckle 8 of two semicircular parts 15 to the connecting barrel axial direction tight.

[0040] Specifically, in the connection sleeve pipe, two semicircular parts 15 are opened to each other, plug-in barrel 6 is inserted into the sleeve pipe, and then the sleeve pipe flange 14 can be fixed in the ring groove 7, and the connecting buckle 8 is buckled, realizing the connection of the sleeve and the connecting barrel.

[0041] Compared with the existing oil injection device and the connection mode of the sleeve pipe, the vertical opening 9 on the connecting barrel divides the horn -shaped connecting seat 10 into two semicircular parts 15, which is more convenient to insert the sleeve pipe flange 14 into the ring groove 7 and fix it. The vertical opening 9 serves as a expansion joint when the horn -shaped connecting seat 10 deforms, which can greatly reduce the deformation amount during connection and prolong the service life of the device.

[0042] It should be understood that the use of these embodiments is only for the purpose of illustrating the utility model and is not intended to limit the scope of protection of the utility model. In addition, it should also be understood that after reading the technical content of the utility model, those skilled in the art can make various changes, modifications and / or variations to the utility model, and all these equivalent forms also fall within the protection scope defined by the appended claims of the present application.

Claims

1. A transformer bushing compound injection device, characterized by, It includes an injector and a connecting mechanism, wherein the connecting mechanism is installed between the sleeve and the injector, and the connecting mechanism seals the sleeve and the injector together; The connecting mechanism comprises a connecting tube and a ventilation assembly capable of replacing the air in the sleeve with an inert gas, the ventilation assembly being mounted on the connecting tube, the connecting tube comprising an upper connecting portion (13) and a trumpet-shaped connecting seat (10), the upper end of the upper connecting portion (13) being connected to the paste injector, and the lower end of the connecting portion being connected to the trumpet-shaped connecting seat (10); A plug tube (6) is installed on the inner wall of the trumpet-shaped connecting seat (10). The plug tube (6) can be inserted into the interior of the sleeve and tightly pressed against the inner wall of the sleeve. An annular groove (7) that can cooperate with the sleeve flange (14) is provided on the inner wall of the trumpet-shaped connecting seat (10). Two vertical openings (9) symmetrical along the axis of the plug tube (6) are provided at the lower end of the trumpet-shaped connecting seat (10). The two vertical openings (9) divide the trumpet-shaped connecting seat (10) into two semicircular parts (15). A connecting buckle (8) that tightens the two semicircular parts (15) toward the axis of the connecting tube is installed on the outer end surface of the trumpet-shaped connecting seat (10).

2. A device for injecting an insulating paste into a transformer bushing according to claim 1, characterized in that The annular groove (7) is located below the plug barrel (6).

3. A device for injecting an insulating paste into a transformer bushing according to claim 1, characterized in that A fixing ring (5) is provided on the inner wall of the trumpet-shaped connecting seat (10), the lower end surface of the fixing ring (5) is fixedly connected to the plug tube (6), and the axis of the fixing ring (5) coincides with the axis of the plug tube (6).

4. A device for injecting an insulating paste into a transformer bushing according to claim 3, characterized in that The fixing ring (5) is located above the vertical opening (9).

5. A device for injecting an insulating paste into a transformer bushing according to claim 3, characterized in that The inner diameter of the plug tube (6) is equal to the inner diameter of the fixing ring (5), and the outer diameter of the plug tube (6) is smaller than the outer diameter of the fixing ring (5); A sealing gasket (11) is sleeved on the plug tube (6), and the sleeve can press the sealing gasket (11) against the surface of the fixing ring (5) close to the plug tube (6).

6. A device for injecting an insulating paste into a transformer bushing according to claim 1, characterized in that The ventilation assembly comprises a one-way exhaust valve (12) and an air intake interface (4) connected to an air source, wherein the air intake interface (4) and the one-way exhaust valve (12) are both mounted on the upper connecting portion (13), and the height of the air intake interface (4) is lower than the height of the one-way exhaust valve (12).

7. A device for injecting an insulating paste into a transformer bushing according to claim 1, characterized in that The paste injector comprises a butter pump (1) and a paste injecting tube (2), wherein the upper end of the paste injecting tube (2) is connected to the butter pump (1), and the lower end of the paste injecting tube (2) can be inserted into the interior of the connecting tube.

8. A transformer bushing compound injection device as defined in claim 7, wherein, A sealing flange (3) is provided on the outer wall of the paste injection tube (2), and the sealing flange (3) is fixed to the upper end of the upper connecting portion (13).

9. A device for injecting insulating paste into a transformer bushing according to claim 7, characterized in that A liquid level sensor for monitoring the insulating paste liquid level inside the casing is installed on the paste injection pipe (2).

10. A device for injecting insulating paste into a transformer bushing according to claim 1, characterized in that The trumpet-shaped connecting seat (10) is made of elastic material.

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