CN211900910U - Vacuum pumping device for on-line replacement of oil-submersible pump of transformer - Google Patents
Vacuum pumping device for on-line replacement of oil-submersible pump of transformer Download PDFInfo
- Publication number
- CN211900910U CN211900910U CN202020304744.3U CN202020304744U CN211900910U CN 211900910 U CN211900910 U CN 211900910U CN 202020304744 U CN202020304744 U CN 202020304744U CN 211900910 U CN211900910 U CN 211900910U
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- China
- Prior art keywords
- pump
- oil
- transformer
- submersible pump
- vacuum
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- Expired - Fee Related
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Abstract
If the submersible pump is replaced on line, the residual gas possibly causes insulation failure of the transformer when entering the running transformer, so that the submersible pump cannot be replaced on line all the time. The vacuum pump (1) for pumping away air is characterized in that an air port at one end of the vacuum pump (1) is sequentially connected with a check valve (3), a reducing tee (4) provided with a Mach vacuum gauge (41), a stop valve (5), an inner joint (6) and an oil-submerged pump interface (7) through a connecting pipeline (2). The product is connected to the original submersible pump without a vacuum pumping device to realize the online non-stop work.
Description
Technical Field
The utility model belongs to the auxiliary device is changed on line to transformer submersible pump of thermal power plant.
Background
The forced oil circulation air-cooled transformer is mainly used for large transformers of 75MVA and above, the submersible pump is an important component in a cooling system of the large transformers, if the submersible pump fails in operation, live online replacement needs to be carried out in time, and otherwise, the load capacity of the transformers is directly influenced.
Most of the butterfly valves connected with the cooler above the oil-submersible pump have no air-bleed plug, after the new oil-submersible pump is installed in place, the flange bolt connected with the cooler above the oil-submersible pump is firstly not tightened and a little gap is reserved so as to exhaust, the butterfly valve connected with the transformer body of the oil-submersible pump is opened, oil is slowly filled into the pump body, and after the reserved gap begins to emit oil, the flange bolt on the side of the cooler is tightened. Thus, partial air in the space between the submersible pump and the cooler side valve cannot be exhausted, residual air entering the transformer can cause bubble discharge of the transformer in operation, and insulation breakdown can be caused in severe cases.
For the sake of safety, measures of additionally installing a temporary spray pipeline for spraying water for cooling are adopted to solve the problem after the existing submersible pump fails, the water spraying cooling is only used for indicating cooling, the effect is not as good as that of strong oil circulation, and local insulation damage inside the transformer can be possibly caused due to the fact that internal heat cannot be timely distributed during high load.
If the submersible pump is replaced on line, the residual gas enters the transformer in operation to possibly cause insulation failure of the transformer due to residual air, so that the submersible pump cannot be replaced on line all the time,
the domestic patent database in recent years discloses technical reports of replacing devices of similar transformer submersible pumps:
ZL2018217936402, a replacing device for a transformer submersible pump, discloses a replacing device for a transformer submersible pump, and comprises a base, a plurality of lifting mechanisms and a supporting platform; the upper surface of the base is provided with a plurality of grooves, and the bottom of the base is provided with a plurality of height-adaptive trundles; the bottom of the base is provided with a lithium battery, and one side of the base is provided with a controller and a handrail; the plurality of lifting mechanisms are respectively arranged in the corresponding grooves, and the lower parts of the lifting mechanisms are clamped with the grooves; distance sensors are arranged beside the plurality of lifting mechanisms; the supporting platform is arranged on the top of a plurality of lifting mechanisms, but the device still has the problem that partial air cannot be exhausted in the space between the submersible pump and the cooler side valve.
Disclosure of Invention
The utility model aims at providing a evacuating device for transformer is changed latent oil pump on line can make the interior exhaust of latent oil pump thoroughly, operation convenient to use, solves current butterfly valve that is connected with the cooler because of latent oil pump top and does not have the gassing stopper, if change latent oil pump on line have the air incomplete, has remaining gas to get into and can lead to transformer insulation fault in the transformer of operation, consequently can't change the problem of latent oil pump on line.
The purpose of the utility model is realized in this way
A evacuating device for on-line change submersible pump of transformer, its constitution includes: the vacuum pump (1) for pumping away air is characterized in that an air port at one end of the vacuum pump (1) is sequentially connected with a check valve (3), a reducing tee (4) provided with a Mach vacuum gauge (41), a stop valve (5), an inner joint (6) and an oil-submerged pump interface (7) through a connecting pipeline (2).
Has the advantages that:
the utility model discloses a preparation special evacuation instrument of oil-submerged pump, new oil-submerged pump installation back that targets in place carries out the evacuation to oil-submerged pump earlier, to oil-submerged pump oil charge again, can ensure like this that there is not residual gas in the oil-submerged pump, has eliminated the hidden danger that changes oil-submerged pump on line and probably lead to transformer insulation fault, has realized the online replacement technique of 630MW thermal power plant 500kV main transformer cooling system oil-submerged pump.
The utility model is suitable for a transformer oil-submersible pump trouble back, eliminate because of oil-submersible pump both sides valve does not have discharge valve, there is the potential safety hazard in the direct online change, the utility model discloses can change oil-submersible pump online in the transformer operation after the installation, solved because of oil-submersible pump top does not have the gassing plug problem with the butterfly valve that the cooler is connected.
The device avoids the environment pollution caused by the overflow of insulating oil, is suitable for the improvement of the existing transformer submersible pump replacement technology, and has the advantages of low investment, simple operation, safety and reliability.
After the latent oil pump trouble in the main transformer operation, close the valve at latent oil pump both ends earlier, demolish old latent oil pump behind the clean latent oil pump deposit oil of row, install new latent oil pump after, use according to following operation steps the utility model discloses to latent oil pump evacuation of newly and oiling:
firstly, a special vacuumizing device for the submersible pump is connected according to the figure 1, an interface 7 of the submersible pump is positioned on the submersible pump, after the connection between each connecting pipeline 2 and a joint is checked to be firm, a stop valve 5 is opened, a vacuum pump 1 is started to vacuumize the submersible pump, and gas in the submersible pump is discharged out of an exhaust port 8 through the interface 7 of the submersible pump, an inner joint 6, the stop valve 5, a reducing tee 4, a check valve 3, the vacuum pump 1 and the connecting pipeline 2 for connecting each element.
And stopping the vacuum pump 1 when the vacuum pump 1 works for 20-30 minutes and the McLeod vacuum gauge 41 shows that the working time is less than 133 pa.
And observing the 41 scales of the McLeod vacuum gauge for 5-10 minutes, and checking and processing each joint and welding line if the system has leakage due to the fact that the vacuum cannot be maintained if the change is obvious.
And repeating the steps until the non-leakage vacuum degree is maintained for 133pa for 5 minutes, and then closing the stop valve 5.
And slightly opening a butterfly valve connected with the oil-submersible pump and the transformer body, slowly filling oil into the pump body, after the oil-submersible pump is filled with the oil, removing the vacuum pump 1, the check valve 2, the McLeod vacuum gauge 41 and the reducing tee joint 4, and reserving the stop valve 5 and a pipeline connected with the oil-submersible pump. The valves at two ends of the submersible pump are completely opened, and the submersible pump is put into operation according to a normal flow, so that air is prevented from entering the transformer.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Wherein: the device comprises a vacuum pump 1, a connecting pipeline 2, a check valve 3, a reducing tee joint 4, a Mai vacuum gauge 41, a stop valve 5, an inner joint 6, an oil-submerged pump interface 7 and an exhaust port 8.
Detailed Description
Example 1:
as shown in figure 1, the utility model discloses mainly including being used for taking out from the vacuum pump 1 of air, still include check valve 3, reducing tee 4, mai shi vacuum gauge 41, stop valve 5, nipple 6, oil-submerged pump interface 7
The one end gas port of vacuum pump 1 passes through the one end that connecting tube 2 connects check valve 3, the other end gas port of vacuum pump 1 is gas vent 8, the other end of check valve 3 passes through the one end that connecting tube 2 connects reducing tee 4, the last logical position of reducing tee 4 installs mai shi vacuometer 41, the one end of connecting tube 2 connection stop valve 5 is passed through to the other end of reducing tee 4, the one end of nipple 6 is connected through connecting tube 2 to the other end of stop valve 5, the other end of nipple 6 passes through connecting tube 2 and connects submersible pump interface 7. The connecting pipeline 2 is made of pressure-resistant rigid polymer rigid plastics.
Claims (1)
1. The utility model provides a vacuum extractor that is used for transformer to change latent oil pump on line which constitutes and includes: the vacuum pump (1) for pumping out air is characterized in that: and an air port at one end of the vacuum pump (1) is sequentially connected with the check valve (3), the reducing tee (4) provided with the McLeod vacuum gauge (41), the stop valve (5), the inner joint (6) and the submersible pump interface (7) through the connecting pipeline (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020304744.3U CN211900910U (en) | 2020-03-12 | 2020-03-12 | Vacuum pumping device for on-line replacement of oil-submersible pump of transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020304744.3U CN211900910U (en) | 2020-03-12 | 2020-03-12 | Vacuum pumping device for on-line replacement of oil-submersible pump of transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211900910U true CN211900910U (en) | 2020-11-10 |
Family
ID=73322965
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020304744.3U Expired - Fee Related CN211900910U (en) | 2020-03-12 | 2020-03-12 | Vacuum pumping device for on-line replacement of oil-submersible pump of transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211900910U (en) |
-
2020
- 2020-03-12 CN CN202020304744.3U patent/CN211900910U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20201110 |