Micro-positive pressure device

Abstract

The utility model relates to the technical field of electric power systems, in particular to a micro-positive pressure device which comprises an air supply assembly, a control machine and an isolated-phase enclosed bus, the air supply assembly is connected with an inflation port of the control machine, and an air inlet and an air return port of the control machine are connected with an off-line enclosed bus through an air inlet pipeline and an air return pipeline. And the first-section air inlet pipeline and the first-section air return pipeline are stainless steel seamless steel pipes. In the prior art, most pipelines in the micro-positive pressure device are aluminum plastic pipes, but in the scheme, the first section of air inlet pipeline and the first section of air return pipeline are stainless steel seamless steel pipes, and the stainless steel seamless steel pipes have the advantages of high strength, corrosion resistance, high temperature resistance and the like and are better in sealing performance; the main pipeline of the micro-positive pressure device is a stainless steel seamless steel pipe, so that the sealing performance of the micro-positive pressure device is improved, the service life of the micro-positive pressure device is prolonged, and long-period reliable operation of the isolated-phase sealing busbar is guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of power system technology, and specifically to a micro positive pressure device. Background Technology

[0002] The micro-positive pressure device is mainly used for the protection of generator phase-separated enclosed busbars. This device filters, removes water and moisture from compressed air, and then fills the enclosed busbar, maintaining a consistently micro-positive pressure inside the busbar. This prevents external air containing moisture or impurities from entering the enclosed busbar, avoiding abnormalities such as decreased busbar insulation, flashover, and hydrogen leakage. Industry requirements stipulate that the enclosed busbar should always maintain a micro-positive pressure and dry environment. The gas pressure range within the phase-separated enclosed busbar should be maintained within a certain range, and the leakage rate should not be less than 6% of the enclosed busbar volume. The dry gas filling the enclosed busbar must be pressurized for a certain period to meet the qualification standards. Therefore, improving the sealing performance of the enclosed busbar is crucial. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a micro positive pressure device with reliable sealing.

[0004] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: A micro positive pressure device includes: an air supply component, a control unit, and a phase-separated closed busbar. The air outlet of the air supply component is connected to the air inlet of the control unit. The air inlet of the control unit is connected to one end of a first section of air inlet pipe. The other end of the first section of air inlet pipe is connected to one end of a second section of air inlet pipe. The other end of the second section of air inlet pipe is connected to the phase-separated closed busbar. The air return port of the control unit is connected to one end of a first section of air return pipe. The other end of the first section of air return pipe is connected to one end of a second section of air return pipe. The other end of the second section of air return pipe is connected to the phase-separated closed busbar. The first section of air inlet pipe and the first section of air return pipe are made of stainless steel seamless pipes.

[0005] The beneficial effects of this utility model are as follows: In the prior art, the pipelines in the micro positive pressure device are mostly aluminum-plastic pipes, while in this solution, by setting the first section of the air inlet pipeline and the first section of the air return pipeline as stainless steel seamless steel pipes, stainless steel seamless steel pipes have the advantages of high strength, corrosion resistance, high temperature resistance, and better sealing performance. By setting the main pipeline of the micro positive pressure device as stainless steel seamless steel pipes, the sealing performance and service life of the micro positive pressure device are improved, thereby ensuring the long-term reliable operation of the phase seal.

[0006] Based on the above technical solution, the present invention can be further improved as follows.

[0007] Furthermore, the second section of the intake pipe and the second section of the return pipe are made of aluminum-plastic composite pipes.

[0008] The beneficial effect of adopting the above-mentioned further solution is that by setting the branch pipeline of the micro positive pressure device as an aluminum-plastic pipe, and the inner and outer PE materials of the aluminum-plastic pipe have good insulation, short circuits between the pipeline and external electrical equipment or metallic grounding are effectively avoided.

[0009] Furthermore, sealant is provided at both ends of the second section of the intake pipe and the second section of the return pipe.

[0010] The beneficial effect of adopting the above-mentioned further solution is that by setting sealant at both ends of the second section of the air inlet pipe and the second section of the air return pipe, the aluminum pipe longitudinally welded in the middle of the aluminum-plastic pipe is insulated, preventing the large current induced in the outer shell of the phase-separated closed busbar from short-circuiting to ground through the air inlet pipe and causing equipment overheating failure.

[0011] Furthermore, the first section of the intake pipe is provided with multiple first connectors, and the second section of the intake pipe is provided with multiple first connectors. The multiple second section of the intake pipe is connected to the other end of the first section of the intake pipe through the multiple first connectors.

[0012] The beneficial effects of adopting the above-mentioned further scheme are: when the phase-separated closed busbar is multi-phase, by setting up multiple second-stage air intake pipelines, the gas can be smoothly delivered to each phase closed busbar. By setting up multiple first connectors, the branching and connection of the pipeline can be facilitated, and the pipeline can be arranged according to the actual situation.

[0013] Furthermore, the first connector is a compression elbow or a compression tee.

[0014] The advantages of adopting the above-mentioned further solution are: the first connecting component is a compression elbow or compression tee, which facilitates the connection and branching of pipelines, ensures the airtightness of pipeline connections, prevents gas leakage, and guarantees the stability of the micro-positive pressure environment. While ensuring the sealing performance of branch connections, installation is more convenient, saving time and effort.

[0015] Furthermore, a valve is installed on the second section of the air intake pipe.

[0016] The advantages of adopting the above-mentioned further solution are: by installing a valve on the second section of the air intake pipe, it is convenient to adjust the opening or stopping of air filling into the phase-separated closed busbar; when a leakage fault occurs in the phase-separated closed busbar, it is convenient to check by phase-by-phase air filling and pressurization, thus narrowing down the scope of the leakage and improving the efficiency of handling leakage defects.

[0017] Furthermore, the valve is a compression fitting ball valve.

[0018] The advantages of adopting the above-mentioned further solution are: by setting a ferrule ball valve, not only is the pipeline sealing performance guaranteed, but it is also convenient for installation and maintenance.

[0019] Furthermore, the other end of the first section of the return gas pipeline is connected to one end of the second connector, and the other end of the second connector is connected to one end of the second section of the return gas pipeline.

[0020] The beneficial effect of adopting the above-mentioned further solution is that by setting a second connector, the connection of the entire return gas pipeline is facilitated and the reliability of the connection is ensured.

[0021] Furthermore, the outer diameter of the stainless steel seamless pipe is 20mm.

[0022] The beneficial effect of adopting the above-mentioned further solution is that setting the outer diameter of the stainless steel seamless steel pipe to 20mm is just right to match the entire pipeline system, including the air inlet and outlet of the control unit and the connection of the aluminum-plastic pipe, ensuring the sealing and reliability of the pipeline connection.

[0023] Furthermore, the first section of the intake pipe and the second section of the intake pipe are perpendicular to each other, the first section of the return pipe and the second section of the return pipe are perpendicular to each other, the first section of the intake pipe and the first section of the return pipe are parallel to each other, and the second section of the intake pipe and the second section of the return pipe are parallel to each other.

[0024] The advantages of adopting the above-mentioned further solutions are that this design makes the entire pipeline layout more compact, saves space, and facilitates installation and maintenance. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the micro-positive pressure device of this utility model.

[0026] The attached diagram lists the components represented by each number as follows:

[0027] 1. Gas storage tank; 2. Control unit; 3. Separate phase closed busbar; 4. First section of gas supply pipeline; 5. Second section of gas supply pipeline; 6. Gas inlet; 7. Gas return port; 8. First section of gas inlet pipeline; 9. Second section of gas inlet pipeline; 10. First section of gas return pipeline; 11. Second section of gas return pipeline; 12. Compression fitting elbow; 13. Compression fitting tee; 14. Valve; 15. Second connecting piece. Detailed Implementation

[0028] The principles and features of this utility model are described below with reference to the accompanying drawings. The examples given are only for explaining this utility model and are not intended to limit the scope of this utility model.

[0029] like Figure 1As shown, this embodiment provides a micro-positive pressure device, including: an instrument compressed air device, an air supply component, a control unit 2, and a phase-separated closed busbar 3. The instrument compressed air device is connected to the air supply port of the air supply component, the air outlet of the air supply component is connected to the air inlet of the control unit 2, the air inlet of the control unit 2 is connected to one end of a first section of air inlet pipe 8, the other end of the first section of air inlet pipe 8 is connected to one end of a second section of air inlet pipe 9, the other end of the second section of air inlet pipe 9 is connected to the phase-separated closed busbar 3, the air return port 7 of the control unit 2 is connected to one end of a first section of air return pipe 10, the other end of the first section of air return pipe 10 is connected to one end of a second section of air return pipe 11, the other end of the second section of air return pipe 11 is connected to the phase-separated closed busbar 3, and the first section of air inlet pipe 8 and the first section of air return pipe 10 are made of stainless steel seamless pipes.

[0030] The beneficial effects of this embodiment are as follows: In the prior art, the pipelines in the micro positive pressure device are mostly aluminum-plastic pipes, while in this solution, by setting the first section of the air inlet pipeline 8 and the first section of the air return pipeline 10 as stainless steel seamless pipes, stainless steel seamless pipes have advantages such as high strength, corrosion resistance, and high temperature resistance, and better sealing performance. By setting the main pipeline of the micro positive pressure device as stainless steel seamless pipes, the sealing performance and service life of the micro positive pressure device are improved, thereby ensuring the long-term reliable operation of the phase-separated closed busbar 3.

[0031] Specifically, the air supply assembly includes an instrument compressed air device, a first air supply pipeline 4, a first oil-water separator, a pressure reducing valve, a pressure gauge, an air storage tank 1, a second air supply pipeline 5, and a second oil-water separator. The instrument compressed air device is connected to the air supply port of the air storage tank 1 through the first air supply pipeline 4. The air outlet of the air storage tank 1 is connected to one end of the second air supply pipeline 5, and the other end of the second air supply pipeline 5 is connected to the air charging port of the control unit 2. The first oil-water separator, the pressure reducing valve, and the pressure gauge are sequentially installed in the first air supply pipeline 4, and the second oil-water separator is installed in the second air supply pipeline 5. The first oil-water separator, the pressure reducing valve, the pressure gauge, and the second oil-water separator are not shown in the figure.

[0032] In a specific example, the instrument compressed air unit connects to the first oil-water separator via the first air supply line 4. After initial oil-water separation, the gas pressure is reduced by a pressure reducing valve and a pressure gauge, maintaining the gas pressure in the gas storage tank 1 at 0.4-0.6 MPa. The gas then enters the second air supply line 5 from the outlet of the gas storage tank 1, undergoes another oil-water separation, and enters the control unit 2. The gas entering the control unit 2 undergoes dehydration, oil removal, drying, and pressure reduction. The inlet 6 and outlet 7 of the control unit 2 are connected to the pipeline using stainless steel 90° arc elbows (one end with a 20mm internal thread and the other end with a quick-connect fitting) to ensure the airtightness of the inlet 6 and outlet 7 of the control unit 2 with the pipeline, thereby providing a stable gas supply to the phase-separated closed busbar 3.

[0033] Based on the above technical solution, the second section of the air intake pipe 9 and the second section of the air return pipe 11 are aluminum-plastic pipes.

[0034] By setting the branch pipelines of the micro positive pressure device as aluminum-plastic pipes, and the inner and outer PE materials of the aluminum-plastic pipes have good insulation properties, short circuits between the pipelines and external electrical equipment or metallic grounding are effectively avoided.

[0035] In one specific example, the phase-separated enclosed busbar 3 is three-phase, with phases A, B, and C each equipped with a second-section air inlet pipe 9, and phase B equipped with a second-section air return pipe 11. One end of the second-section air inlet pipe 9 and the second-section air return pipe 11 are directly threaded into the external thread of the phase-separated enclosed busbar 3, and secured with a brass open-end retaining ring and a hinged nut to ensure the airtightness of the connection between the phase-separated enclosed busbar 3 and the pipes, preventing air leakage.

[0036] Based on the above technical solution, sealant is provided at both ends of the second section of the intake pipe 9 and the second section of the return pipe 11.

[0037] By applying sealant to both ends of the second intake pipe 9 and the second return pipe 11, the aluminum pipe longitudinally welded in the middle of the aluminum-plastic pipe is insulated, preventing the large current induced in the outer shell of the phase-separated closed busbar 3 from short-circuiting to ground through the intake pipe and causing equipment overheating faults.

[0038] Specifically, apply 1587 sealant to both ends of the second intake pipe 9 and the second return pipe 11.

[0039] Optionally, the sealant may be a silicone sealant, polyurethane sealant, epoxy resin sealant, RTV silicone rubber sealant, or other sealants with good sealing performance.

[0040] Based on the above technical solution, the first section of the air intake pipe 8 is provided with a plurality of first connectors, and the second section of the air intake pipe 9 is provided with a plurality of first connectors. The plurality of second section air intake pipes 9 are connected to the other end of the first section of the air intake pipe 8 in a corresponding manner through the plurality of first connectors.

[0041] When the phase-separated closed busbar 3 is multi-phase, multiple second-stage air inlet pipes 9 are set up to smoothly deliver gas to each phase closed busbar. Multiple first connectors are set up to facilitate the branching and connection of the pipelines and make it easier to arrange the pipelines according to the actual situation.

[0042] Based on the above technical solution, the first connector is a compression elbow 12 or a compression tee 13.

[0043] The first connector is a compression fitting elbow 12 or a compression fitting tee 13, which facilitates pipe connection and branching, ensures airtightness at pipe connections, prevents gas leakage, and guarantees the stability of the slightly positive pressure environment. While ensuring sealing performance at branch connections, it also makes installation more convenient, saving time and effort.

[0044] In one specific example, the phase-separated closed busbar 3 is three-phase, with phases A, B, and C each equipped with a second section of intake pipe 9, and phase B equipped with a second section of return pipe 11. Each intake pipe has a clamping elbow 12 and two clamping tees 13. The two main pipe ends of one clamping tee 13 are connected to the first section of intake pipe 8, and the branch pipe end of the clamping tee 13 is connected to the second section of intake pipe 9 for phase C. The two main pipe ends of the other clamping tee 13 are connected to the first section of intake pipe 8, and the branch pipe end of the other clamping tee 13 is connected to the second section of intake pipe 9 for phase B. One end of the clamping elbow 12 is connected to the first section of intake pipe 8, and the other end of the clamping elbow 12 is connected to the second section of intake pipe 9 for phase A.

[0045] Based on the above technical solution, a valve 14 is installed on the second section of the air intake pipe 9.

[0046] By installing a valve 14 on the second air intake pipe 9, it is convenient to adjust the opening or stopping of air filling into the phase-separated closed busbar 3; when a leakage fault occurs in the phase-separated closed busbar 3, it is convenient to check by phase-separated air filling and pressure testing, narrowing the scope of the leakage and improving the efficiency of handling leakage defects.

[0047] Based on the above technical solution, the valve 14 is a compression ball valve.

[0048] By using a compression fitting ball valve, not only is the pipeline sealing performance guaranteed, but installation and maintenance are also facilitated.

[0049] Based on the above technical solution, the other end of the first section of return gas pipeline 10 is connected to one end of the second connector 15, and the other end of the second connector 15 is connected to one end of the second section of return gas pipeline 11.

[0050] By providing the second connector 15, the connection of the entire return gas pipeline is facilitated and the reliability of the connection is ensured.

[0051] Specifically, the second connector 15 is a compression fitting elbow.

[0052] Based on the above technical solution, the outer diameter of the stainless steel seamless steel pipe is 20mm.

[0053] The outer diameter of the stainless steel seamless steel pipe is set to 20mm, which is just right to match the entire pipeline system, including the air inlet 6 and air outlet 7 of the control unit 2 and the connection of the aluminum-plastic pipe, to ensure the sealing and reliability of the pipeline connection.

[0054] Based on the above technical solution, the first section of the intake pipe 8 and the second section of the intake pipe 9 are perpendicular to each other, the first section of the return pipe 10 and the second section of the return pipe 11 are perpendicular to each other, the first section of the intake pipe 8 and the first section of the return pipe 10 are parallel to each other, and the second section of the intake pipe 9 and the second section of the return pipe 11 are parallel to each other.

[0055] This design makes the entire pipeline layout more compact, saves space, and facilitates installation and maintenance.

[0056] In one specific example, the phase-separated enclosed busbar is three-phase, with second-section air intake pipes 9 for phases A, B, and C, and a second-section air return pipe 11 for phase B. The first-section air intake pipe 8 and the second-section air intake pipe 9 are perpendicular to each other, as are the first-section air return pipe 10 and the second-section air return pipe 11. The first-section air intake pipe 8 and the first-section air return pipe 10 are parallel to each other, and the second-section air intake pipe 9 and the second-section air return pipe 11 are parallel to each other. By laying the air intake and air return pipes of the phase-separated enclosed busbar 3 horizontally and vertically, with a horizontal and vertical deviation not exceeding 3‰, and adjusting the spacing between the two pipes to be equidistant, the air intake and air return pipes are fixed to the supports on both sides of the phase-separated enclosed busbar 3 using stainless steel Φ20mm U-shaped clamps approximately every 1 meter, avoiding unevenness caused by bending, resulting in a compact structure and an aesthetically pleasing finish.

[0057] This micro-positive pressure device employs a combination of seamless stainless steel pipes and aluminum-plastic composite pipes. This design ensures the strength and corrosion resistance of the main pipeline while the flexibility of the aluminum-plastic composite pipes simplifies the installation of branch pipelines. The use of sealant and compression fittings ensures airtightness at pipeline connections, preventing gas leakage and guaranteeing the stability of the micro-positive pressure environment. Overall, this micro-positive pressure device improves sealing performance and extends service life.

[0058] In the description of this utility model, it should be understood that the terms "center", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0059] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0060] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0061] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0062] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0063] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A micro-pressurized device, characterized by, The utility model relates to a kind of air supply assembly, control machine (2) and off-phase enclosed busbar (3), the air outlet of the air supply assembly is connected with the air inlet of the control machine (2), the air inlet (6) of the control machine (2) is connected with the one end of first section air pipe (8), the other end of first section air pipe (8) and the one end of second section air pipe (9) are connected, the other end of second section air pipe (9) and the off-phase enclosed busbar (3) are connected, the air outlet (7) of the control machine (2) is connected with the one end of first section return air pipe (10), the other end of first section return air pipe (10) and the one end of second section return air pipe (11) are connected, the other end of second section return air pipe (11) and the off-phase enclosed busbar (3) are connected, and first section air pipe (8) and first section return air pipe (10) are stainless steel seamless steel pipe. Second section air pipe (9) and second section return air pipe (11) are aluminum plastic pipe.

2. The micro-positive pressure device of claim 1, wherein, Sealing glue is arranged at the two ends of second section air pipe (9) and second section return air pipe (11) respectively.

3. The micro-positive pressure device of claim 1, wherein, A plurality of first connecting pieces are arranged on first section air pipe (8), and a plurality of second section air pipes (9) are arranged, and the other end of first section air pipe (8) is connected with the plurality of second section air pipes (9) one by one through the plurality of first connecting pieces.

4. The micro-positive pressure device of claim 2, wherein, The first connecting piece is a clamp sleeve elbow (12) or a clamp sleeve tee joint (13).

5. The micro-pressurized device of claim 4, wherein, Valve (14) is arranged on second section air pipe (9).

6. The device of claim 1, wherein, The valve is a clamp sleeve ball valve.

7. The micro-pressurized device of claim 6, wherein, The other end of first section return air pipe (10) is connected with the one end of second connecting piece (15), and the other end of second connecting piece (15) is connected with the one end of second section return air pipe (11).

8. The micro-positive pressure device of claim 1, wherein, The outer diameter of the stainless steel seamless steel pipe is 20mm.

9. The micro-positive pressure device according to any one of claims 1-8, wherein, First section air pipe (8) and second section air pipe (9) are perpendicular to each other, first section return air pipe (10) and second section return air pipe (11) are perpendicular to each other, first section air pipe (8) and first section return air pipe (10) are parallel to each other, and second section air pipe (9) and second section return air pipe (11) are parallel to each other.

10. The micro-pressurized device of claim 9, wherein, ​

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