Automatic oil return device for transformer vacuum oil filter

Abstract

The utility model discloses an automatic oil return device for a transformer vacuum oil filter, which comprises a vacuum tank, an oil inlet pipeline and an oil outlet pipeline, wherein the oil inlet pipeline and the oil outlet pipeline are connected with the transformer vacuum oil filter; an oil inlet pipe flange is arranged on the oil inlet pipeline, and an oil inlet pipe electromagnetic valve and an oil inlet pipe ball valve are arranged on a pipeline connected with one end of the oil inlet pipe flange; an oil outlet pipe flange is arranged on the oil outlet pipeline, an oil outlet pipe electromagnetic valve and an oil outlet pipe ball valve are arranged on a pipeline connected with one end of the oil outlet pipe flange, and the oil outlet pipe ball valve is externally connected with an oil outlet hose; wherein a communicating pipe is arranged between the oil inlet pipeline and the oil outlet pipeline, a first ball valve, a second ball valve and a communicating pipe electromagnetic valve are sequentially connected to the communicating pipe in series, one end of the first ball valve is connected with a pipeline between the oil inlet pipe flange and the oil inlet pipe electromagnetic valve, and one end of the communicating pipe electromagnetic valve is connected with a pipeline between the oil outlet pipe electromagnetic valve and the oil outlet pipe ball valve. The insulating oil in the oil outlet pipe can be automatically recycled after oil filtering of the transformer vacuum oil filter is finished, operation is easy, and pollution is avoided.

Description

Technical Field

[0001] This utility model relates to the technical field of oil recovery pipelines in oil filters, and in particular to an automatic oil return device for transformer vacuum oil filters. Background Technology

[0002] Currently, in known transformer vacuum oil filters, after the transformer body insulating oil is circulated with hot oil or the insulating oil in the storage tank is filtered, the insulating oil pipeline is long and contains a large amount of insulating oil. The oil in the pipeline needs to be returned to the filter's vacuum tank. The insulating oil in the inlet pipeline can be directly sucked into the filter's vacuum tank. To recover the insulating oil in the outlet pipeline, the filter must be shut down, the inlet and outlet pipeline flanges removed, the original outlet pipeline reconnected to the transformer inlet pipeline flange, and the filter restarted to recover the insulating oil from the original outlet pipeline to the filter's vacuum tank. However, because the external inlet and outlet pipelines are flanged to the transformer filter, leakage of insulating oil from the outlet pipeline occurs during the disassembly process, contaminating the construction area and making cleaning difficult.

[0003] In summary, how to avoid the cumbersome operation of disassembling pipelines and prevent the work site from being contaminated are problems that urgently need to be solved by those skilled in the art. Utility Model Content

[0004] The technical problem to be solved by this application is to overcome the fact that existing transformer vacuum oil filters cannot automatically recover the insulating oil in the oil outlet pipe after the oil filtration is completed. Existing technology requires disassembling the inlet and outlet oil flanges, which is labor-intensive and pollutes the site.

[0005] To solve the above-mentioned technical problems, this application provides an automatic oil return device for a transformer vacuum oil filter, comprising: a vacuum tank for connecting the oil inlet pipe and the oil outlet pipe of the transformer vacuum oil filter; an oil inlet flange is provided on the oil inlet pipe, and an oil inlet solenoid valve and an oil inlet ball valve connected in series are provided on the pipe connected to one end of the oil inlet flange; an oil outlet flange is provided on the oil outlet pipe, and an oil outlet solenoid valve and an oil outlet ball valve connected in series are provided on the pipe connected to one end of the oil outlet flange, and the oil outlet ball valve is also externally connected to an oil outlet hose; wherein, a connecting pipe is provided between the oil inlet pipe and the oil outlet pipe, and a first ball valve, a second ball valve and a connecting pipe solenoid valve are connected in series on the connecting pipe, one end of the first ball valve is connected to the pipe between the oil inlet flange and the oil inlet solenoid valve, and one end of the connecting pipe solenoid valve is connected to the pipe between the oil outlet solenoid valve and the oil outlet ball valve.

[0006] According to the embodiments of this application, the positive and negative power lines of the inlet solenoid valve, the outlet solenoid valve, and the connecting pipe solenoid valve are respectively connected to the positive terminal and the negative terminal.

[0007] According to an embodiment of this application, a return oil operation indicator light is provided on the line between the negative terminal and the negative power supply, and a circuit breaker and an oil outlet pipe return oil start switch are provided on the line between the positive terminal and the positive power supply.

[0008] According to an embodiment of this application, the oil return start switch of the oil outlet pipe is installed on the oil outlet pipe.

[0009] According to an embodiment of this application, a coarse filter and a heater are also provided on the oil inlet pipeline.

[0010] According to an embodiment of this application, a bypass pipeline is also provided between the connecting pipe and the oil inlet pipe. One end of the bypass pipeline is connected to the pipeline between the second ball valve and the connecting pipe solenoid valve, and the other end is connected to the pipeline between the oil inlet pipe flange and the oil inlet pipe solenoid valve. An electromagnetic bypass valve is provided on the bypass pipeline.

[0011] According to an embodiment of this application, the oil outlet ball valve is also externally connected to an oil outlet hose.

[0012] According to an embodiment of this application, the oil inlet ball valve is also externally connected to an oil inlet hose.

[0013] According to an embodiment of this application, both the inlet and outlet oil lines are equipped with motor-driven oil pumps.

[0014] According to an embodiment of this application, a fine filter is provided on the oil outlet pipeline.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] This invention features a solenoid valve and a ball valve installed on the inlet and outlet oil pipes of a transformer vacuum oil purifier. A return oil connecting pipe is also installed between the inlet and outlet oil pipes, and this connecting pipe is also equipped with a solenoid valve and a ball valve. By controlling the opening and closing of the solenoid valve and ball valve via a switch, the insulating oil in the original outlet oil pipe is recovered through the connecting pipe and the inlet oil pipe back to the vacuum tank of the transformer vacuum oil purifier. This avoids the problem of oil leakage and pollution of the construction area caused by flange disassembly in existing technologies. It achieves automatic recovery of the insulating oil in the outlet oil pipe after the transformer vacuum oil purifier finishes filtration, is simple to operate, and produces no pollution. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings of the embodiments will be briefly described below. Obviously, the drawings described below only relate to some embodiments of this application, and are not intended to limit this application.

[0018] Figure 1 This is a connection diagram of an automatic oil return device for a transformer vacuum oil filter, as an example of this utility model.

[0019] Figure 2This is a schematic diagram of the circuit control connection of the inlet pipe solenoid valve, the outlet pipe solenoid valve, and the connecting pipe solenoid valve in this utility model example.

[0020] The annotations in the attached figures are explained as follows:

[0021] 10. Vacuum tank; 11. Oil inlet pipe; 12. Oil outlet pipe; 13. Connecting pipe; 14. Bypass pipe; 15. Indicator light; 16. Circuit breaker; 17. Oil outlet pipe return start switch; 18. Positive terminal; 19. Negative terminal; 111. Oil inlet pipe flange; 112. Oil inlet pipe solenoid valve; 113. Oil inlet pipe ball valve; 121. Oil outlet pipe flange; 122. Oil outlet pipe solenoid valve; 123. Oil outlet pipe ball valve; 131. First ball valve; 132. Second ball valve; 133. Connecting pipe solenoid valve; 141. Solenoid bypass valve. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. Based on the described embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0023] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this application pertains. The terms “first,” “second,” and similar terms used in the specification and claims of this patent application do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the terms “an” or “a,” and similar terms, do not indicate a limitation of quantity, but rather indicate the presence of at least one.

[0024] like Figure 1 , Figure 2As shown, an automatic oil return device for a transformer vacuum oil filter according to an example of this utility model includes a vacuum tank 10 connecting an oil inlet pipe 11 and an oil outlet pipe 12 of the transformer vacuum oil filter. A solenoid valve and an oil inlet ball valve 113 are connected in series on the oil inlet pipe 11. An oil outlet solenoid valve 122 and an oil outlet ball valve 123 are connected in series on the oil outlet pipe 12. A connecting pipe 13 is provided between the oil inlet pipe 11 and the oil outlet pipe 12. A first ball valve 131, a second ball valve 132 and a connecting pipe solenoid valve 133 are connected in series on the connecting pipe 13. Compared to existing technologies that require disassembling the inlet and outlet flanges to recover insulating oil from the oil pipes of a transformer vacuum oil filter, which can lead to oil pipe leaks, this application achieves automatic switching between the original inlet and outlet oil pipes by operating a ball valve and a solenoid valve. The insulating oil in the original outlet oil pipe is recovered into the vacuum tank 10 of the transformer vacuum oil filter, and the oil filter is shut down. This allows for one-button switching of the inlet and outlet oil pipes, saving time and effort.

[0025] In this embodiment, the vacuum tank 10 is used to connect the oil inlet pipe 11 and the oil outlet pipe 12 of the transformer vacuum oil filter.

[0026] Specifically, a coarse filter and a heater can be installed on the oil inlet pipe 11, and a fine filter can be installed on the oil outlet pipe 12. By installing a heater, the oil can be heated evenly, thereby improving the demulsification efficiency of the oil. By installing coarse and fine filters, secondary pollution can be effectively avoided.

[0027] In this embodiment, the oil inlet pipeline 11 is provided with an oil inlet flange 111, and an oil inlet solenoid valve 112 and an oil inlet ball valve 113 connected in series are provided on the pipeline connected to one end of the oil inlet flange 111; the oil outlet pipeline 12 is provided with an oil outlet flange 121, and an oil outlet solenoid valve 122 and an oil outlet ball valve 123 connected in series are provided on the pipeline connected to one end of the oil outlet flange 121. A connecting pipe 13 is provided between the oil inlet pipeline 11 and the oil outlet pipeline 12, and a first ball valve 131, a second ball valve 132, and a connecting pipe solenoid valve 133 are connected in series on the connecting pipe 13. One end of the first ball valve 131 is connected to the pipeline between the oil inlet flange 111 and the oil inlet solenoid valve 112, and one end of the connecting pipe solenoid valve 133 is connected to the pipeline between the oil outlet solenoid valve 122 and the oil outlet ball valve 123.

[0028] Specifically, a bypass pipe 14 is provided between the connecting pipe 13 and the oil inlet pipe. One end of the bypass pipe 14 is connected to the pipe between the second ball valve 132 and the connecting pipe solenoid valve 133, and the other end is connected to the pipe between the oil inlet pipe flange 111 and the oil inlet pipe solenoid valve 112. An electromagnetic bypass valve 141 is provided on the bypass pipe 14.

[0029] Specifically, the oil outlet ball valve 123 is also connected to an external oil outlet hose, and the oil inlet ball valve 113 is also connected to an external oil inlet hose.

[0030] Specifically, the positive and negative power lines of the inlet solenoid valve 112, the outlet solenoid valve 122, and the connecting pipe solenoid valve 133 are connected to the positive terminal 18 and the negative terminal 19, respectively. A return oil operation indicator light 15 is provided on the line between the negative terminal 19 and the negative power supply, and a circuit breaker 16 and an outlet pipe return oil start switch 17 are provided on the line between the positive terminal 18 and the positive power supply.

[0031] Specifically, both the oil inlet pipe 11 and the oil outlet pipe 12 are equipped with motor-driven oil pumps.

[0032] The working process of an automatic oil return device for a transformer vacuum oil filter in this embodiment is as follows: After the transformer vacuum oil filter finishes filtering and the measures on the transformer (or oil storage tank) side are completed, and all the insulating oil in the inlet pipe enters the vacuum tank 10, the oil return start switch 17 in the outlet pipe is pressed. The inlet pipe solenoid valve 112 is closed, the outlet pipe solenoid valve 122 is closed, and the connecting pipe solenoid valve 133 is opened. The insulating oil in the outlet hose connected to the outlet pipe ball valve 123 passes through the outlet pipe ball valve 123, the first ball valve 131, the second ball valve 132, the connecting pipe solenoid valve 133, and the inlet pipe flange 111 in sequence. After coarse filtration and heating, the oil enters the vacuum tank 10. After all the external insulating oil has entered the vacuum tank 10, the main switch of the oil filter is turned off, and the inlet pipe ball valve 113 and the outlet pipe ball valve 123 are closed, thus completing the recovery of the insulating oil in the outlet pipe.

[0033] In summary, the technical solution of this application has the following beneficial effects:

[0034] This invention features a solenoid valve and a ball valve installed on the inlet and outlet oil pipes of a transformer vacuum oil purifier. A return oil connecting pipe is also installed between the inlet and outlet oil pipes, and this connecting pipe is also equipped with a solenoid valve and a ball valve. By controlling the opening and closing of the solenoid valve and ball valve via a switch, the insulating oil in the original outlet oil pipe is recovered through the connecting pipe and the inlet oil pipe back to the vacuum tank of the transformer vacuum oil purifier. This avoids the problem of oil leakage and pollution of the construction area caused by flange disassembly in existing technologies. It achieves automatic recovery of the insulating oil in the outlet oil pipe after the transformer vacuum oil purifier finishes filtration, is simple to operate, and produces no pollution.

[0035] The above are merely exemplary embodiments of this application and are not intended to limit the scope of protection of this application, which is determined by the appended claims.

Claims

1. An automatic oil return device for a transformer vacuum oil filter, characterized in that, include: Vacuum tank, used to connect the inlet and outlet oil lines of the transformer vacuum oil filter; The oil inlet pipe is equipped with an oil inlet pipe flange, and an oil inlet pipe solenoid valve and an oil inlet pipe ball valve are connected in series on the pipe connected to one end of the oil inlet pipe flange. The oil outlet pipeline is equipped with an oil outlet flange, and an oil outlet solenoid valve and an oil outlet ball valve are connected in series on the pipeline connected to one end of the oil outlet flange. The oil outlet ball valve is also externally connected to an oil outlet hose. A connecting pipe is provided between the oil inlet pipeline and the oil outlet pipeline. A first ball valve, a second ball valve, and a connecting pipe solenoid valve are connected in series on the connecting pipe. One end of the first ball valve is connected to the pipeline between the oil inlet flange and the oil inlet solenoid valve, and one end of the connecting pipe solenoid valve is connected to the pipeline between the oil outlet solenoid valve and the oil outlet ball valve.

2. The automatic oil return device for a transformer vacuum oil filter according to claim 1, characterized in that, The positive and negative power lines of the inlet solenoid valve, outlet solenoid valve, and connecting pipe solenoid valve are connected to the positive terminal and the negative terminal, respectively.

3. An automatic oil return device for a transformer vacuum oil filter according to claim 2, characterized in that, The negative terminal is equipped with an oil return operation indicator light on the line connecting the negative terminal to the negative power supply, and the positive terminal is equipped with a circuit breaker and an oil return start switch on the line connecting the positive terminal to the positive power supply.

4. An automatic oil return device for a transformer vacuum oil filter according to claim 3, characterized in that, The oil return start switch is located on the oil outlet pipe.

5. An automatic oil return device for a transformer vacuum oil filter according to claim 1, characterized in that, The oil inlet pipeline is also equipped with a coarse filter and a heater.

6. An automatic oil return device for a transformer vacuum oil filter according to claim 1, characterized in that, A bypass pipeline is also provided between the connecting pipe and the oil inlet pipe. One end of the bypass pipeline is connected to the pipeline between the second ball valve and the connecting pipe solenoid valve, and the other end is connected to the pipeline between the oil inlet pipe flange and the oil inlet pipe solenoid valve. An electromagnetic bypass valve is provided on the bypass pipeline.

7. An automatic oil return device for a transformer vacuum oil filter according to claim 1, characterized in that, The oil outlet ball valve is also connected to an external oil outlet hose.

8. An automatic oil return device for a transformer vacuum oil filter according to claim 1, characterized in that, The oil inlet ball valve is also connected to an external oil inlet hose.

9. An automatic oil return device for a transformer vacuum oil filter according to claim 1, characterized in that, Both the inlet and outlet oil lines are equipped with motor-driven oil pumps.

10. An automatic oil return device for a transformer vacuum oil filter according to claim 1, characterized in that, A fine filter is installed on the oil outlet pipeline.

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