Oil-immersed transformer with filtering device

Abstract

The utility model relates to the technical field of oil-immersed transformers, and discloses an oil-immersed transformer with a filtering device, which comprises a shell, a cover plate is fixedly mounted at the top of the shell, an idle speed motor is fixedly mounted on the side wall of the shell, the output end of the idle speed motor is fixedly connected with a roller, and the roller is fixedly connected with a filter screen. The inner surface of the roller is fixedly connected with a fixing rod, the fixing rod penetrates through a filter screen, and a cleaning assembly is arranged below the cover plate. Through the arrangement of the cleaning assembly, a filter screen and a magnetic sheet and a magnetic plate which are arranged on a cleaning plate and have opposite magnetisms, the contact transmission of a contact wheel and the filter screen can drive a cleaning shaft to keep the reverse rotation of the movement direction of the cleaning plate, so that impurities attached to the lower surface of the filter screen are cleaned, and the impurities fall onto a collecting scraper to be collected; and the cleanliness of the surface of the filter screen is ensured, so that the purity of the insulating oil filled in the shell is ensured, and good insulating performance and heat transfer performance are kept.

Description

Technical Field

[0001] The utility model relates to the technical field of oil-immersed transformers, in particular to an oil-immersed transformer with a filtering device. Background Art

[0002] Oil-immersed transformer oil uses a vacuum oil filtration and oil filling process to minimize moisture inside the transformer; insulating oil is usually used as the filling medium inside the transformer to provide an insulating and moisture-proof environment for the external environment of the terminal block inside the transformer. At the same time, the insulating oil itself has a good thermal conductivity, which can transfer the heat generated by the terminal block inside the transformer to the outside during long-term operation and dissipate heat through the heat sink provided on the transformer casing. However, as the oil-immersed transformer is used for a long time, there will be some impurities in the oil. As the impurities continue to accumulate, the overall operation will be not smooth and the heat exchange efficiency will decrease. Therefore, the insulating oil inside the transformer needs to be filtered.

[0003] According to a disclosed oil-immersed transformer with a filtering device (Announcement No.: CN218769003U), in the above application, a removable and replaceable filter is provided at the upper position inside the transformer. This allows the insulating oil inside the transformer to be naturally filtered as the insulating oil flows during heat transfer near the terminal, thereby reducing the dispersion of impurities in the insulating oil and thus reducing the effectiveness of the insulating oil.

[0004] However, during actual use of the above-mentioned equipment, the circulation efficiency of the insulating oil in the internal space of the transformer is low. It relies on convection generated by heat transfer near the terminal blocks to flow, and the heat dissipation efficiency is poor. In addition, the static filter is generally ineffective in removing filtered impurities. It is easy to cause secondary pollution due to the flow of insulating oil, which reduces the use effect of the insulating oil. In view of this, we propose an oil-immersed transformer with a filtering device. Utility Model Content

[0005] The purpose of the utility model is to provide an oil-immersed transformer with a filtering device to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned object, the present invention provides the following technical solution: an oil-immersed transformer with a filtering device, comprising a housing, a cover plate fixedly mounted on the top of the housing, an idle motor fixedly mounted on the side wall of the housing, a roller fixedly connected to the output end of the idle motor, a fixed rod fixedly connected to the inner surface of the roller, a filter screen passing through the fixed rod, and the filter screen fixedly connected to the fixed rod, a cleaning assembly provided below the cover plate, the cleaning assembly comprising:

[0007] A volute spring is fixedly connected to the arc-shaped outer wall of the fixed rod, and a collecting scraper is fixedly installed on the lower surface of the cover plate;

[0008] A connecting rod, wherein the upper surface of the horizontal portion of the collecting scraper is rotatably connected to the bottom end of the connecting rod, a cleaning plate is hingedly connected to the top side wall of the connecting rod, a transmission hole is opened at the end of the cleaning plate, a sliding rod passes through the inner surface of the transmission hole, and the end of the sliding rod is fixedly connected to the cleaning shaft;

[0009] A small gear is rotatably connected to the side wall of the cleaning plate, a large gear is rotatably connected to the side wall of the cleaning plate, the large gear is coaxially fixedly connected to the contact plate, and a wave groove is opened on the arc-shaped outer wall of the sliding rod.

[0010] Preferably, a circular groove with a diameter larger than the outer diameter of the spiral spring is opened at the end of the filter, and the fixing rod is arranged at the center of the circular groove. At the same time, the two ends of the spiral spring are respectively fixedly connected to the arc-shaped outer wall of the fixing rod and the bottom inner surface of the circular groove.

[0011] Preferably, magnetic sheets are provided on the upper surfaces of both ends of the cleaning plate, and magnetic plates with opposite magnetic properties to the magnetic sheets are provided on the lower surfaces of both ends of the filter screen, so that when the drum rotates and drives the filter screen close to the collecting scraper, the filter screen will be attracted to the cleaning plate through the magnetic sheets and magnetic plates with opposite magnetic properties.

[0012] Preferably, a strip-shaped limit block is provided on the arc-shaped outer wall at the right end of the slide rod, and a hole with a diameter matching the outer diameter of the slide rod is opened at the axis center of the pinion gear, and at the same time, a limit slot matching the above-mentioned strip-shaped limit block is opened on the inner surface of the hole, so that relative displacement between the slide rod and the pinion gear can only occur in the horizontal direction, and relative rotation will not occur.

[0013] Preferably, the large gear and the small gear mesh to realize transmission, and the arc-shaped outer wall of the contact plate is kept in close contact with the lower surface of the filter screen, so that during the continuous rotation of the drum, the filter screen is continuously pressed down and deflected.

[0014] Preferably, a limiting ball that is compatible with the wave groove is provided on the arc-shaped inner surface of the transmission hole, and the limiting ball is arranged inside the wave groove. Then, during the rotation of the sliding rod, the sliding rod is restricted and guided by the wave groove and the limiting ball, and continues to rotate and performs a small reciprocating motion in the horizontal direction.

[0015] Compared with the prior art, the present invention provides an oil-immersed transformer with a filtering device, which has the following beneficial effects:

[0016] 1. The oil-immersed transformer with a filtering device is provided with a cleaning assembly, which cooperates with the filter and the magnetic sheets and magnetic plates with opposite magnetic properties provided on the cleaning plate. The contact transmission between the contact wheel and the filter can drive the cleaning shaft to rotate in the opposite direction of the movement direction of the cleaning plate, so as to clean the impurities attached to the lower surface of the filter and make them fall onto the collection scraper for collection, thereby ensuring the cleanliness of the filter surface and further ensuring the purity of the insulating oil filled in the shell, so that it maintains good insulation performance and heat transfer performance.

[0017] 2. The oil-immersed transformer with a filtering device has a wave groove on the arc-shaped outer wall of the rotating slide rod and a limit ball that cooperates with the wave groove is provided in the transmission hole. The slide rod rotates continuously and performs a small reciprocating motion in the horizontal direction, thereby changing the operating path of the cleaning shaft during the rotation process, so that it can better clean impurities attached to the filter screen and improve the operating effect of the cleaning component. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the main structure of the utility model;

[0019] Figure 2 This is a schematic diagram of the partial three-dimensional structure of the cover plate of the utility model;

[0020] Figure 3 This is a schematic diagram of the three-dimensional structure of the collecting scraper and roller of the utility model;

[0021] Figure 4 This is a schematic diagram of the cross-sectional structure of the roller end portion of the utility model;

[0022] Figure 5 This is a three-dimensional schematic diagram of the filter end of the utility model;

[0023] Figure 6 This is a schematic diagram of the explosion of the end of the cleaning plate of the utility model.

[0024] In the figure: 1. Housing; 2. Cover; 3. Idle motor; 4. Drum; 5. Fixing rod; 6. Filter; 7. Volute spring; 8. Collecting scraper; 9. Connecting rod; 10. Cleaning plate; 11. Transmission hole; 12. Sliding rod; 13. Cleaning shaft; 14. Small gear; 15. Large gear; 16. Contact plate; 17. Wave groove. DETAILED DESCRIPTION

[0025] like Figure 1-6As shown, the utility model provides a technical solution: an oil-immersed transformer with a filtering device, comprising a housing 1, a cover plate 2 fixedly mounted on the top of the housing 1, an idle motor 3 fixedly mounted on the side wall of the housing 1, a roller 4 fixedly connected to the output end of the idle motor 3, a fixed rod 5 fixedly connected to the inner surface of the roller 4, a filter screen 6 passing through the fixed rod 5, and the filter screen 6 is fixedly connected to the fixed rod 5, a cleaning assembly is provided below the cover plate 2, the cleaning assembly includes a vortex spring 7, a vortex spring 7 is fixedly connected to the arc-shaped outer wall of the fixed rod 5, and the cover plate 2 is provided with a plurality of filter elements. A collecting scraper 8 is fixedly installed on the lower surface, and the upper surface of the horizontal part of the collecting scraper 8 is rotatably connected to the bottom end of the connecting rod 9. The top side wall of the connecting rod 9 is hinged with a cleaning plate 10. A transmission hole 11 is opened at the end of the cleaning plate 10, and a slide rod 12 passes through the inner surface of the transmission hole 11. The end of the slide rod 12 is fixedly connected to the cleaning shaft 13. The side wall of the cleaning plate 10 is rotatably connected to a small gear 14, and the side wall of the cleaning plate 10 is rotatably connected to a large gear 15. The large gear 15 is coaxially fixedly connected to the contact plate 16, and a wave groove 17 is opened on the arc-shaped outer wall of the slide rod 12.

[0026] In one embodiment of the present invention, the cover plate 2 is matched with the shell 1, and an external terminal is provided on the top of the cover plate 2, and the external terminal is electrically connected to the terminal inside the shell 1, so as to realize power supply. In addition, there are two groups of idle motors 3, and the two groups of idle motors 3 are mirror-imaged on both sides of the central axis of the shell 1, and the output shafts of the two groups of idle motors 3 rotate in opposite directions, so as to better drive the roller 4 to rotate, and cooperate with the filter 6 to make the insulating oil inside the shell 1 flow toward the middle to form convection, thereby improving the flow effect of the insulating oil, and thereby improving the heat dissipation efficiency of the shell 1. Furthermore, discs with a diameter larger than the outer diameter of the roller 4 are provided at both ends of the roller 4, so as to facilitate the installation of the fixing rod 5 and the filter 6. At the same time, the end of the filter 6 is provided with a diameter larger than the scroll The circular groove of the outer diameter of the spring 7 is formed, and the fixing rod 5 is arranged at the center of the circular groove. At the same time, the two ends of the spiral spring 7 are respectively fixedly connected to the arc-shaped outer wall of the fixing rod 5 and the bottom inner surface of the circular groove, so that the filter screen 6 has enough space to deflect after contacting the collecting scraper 8 as the roller 4 rotates, and the spiral spring 7 can provide a reset effect for the filter screen 6 after deflection, so that the roller 4 drives the filter screen 6 to deflect and extend after leaving the collecting scraper 8, thereby stirring the insulating oil inside the shell 1 and filtering out impurities near the insulating oil liquid surface. In addition, an inner groove is provided on the horizontal part of the collecting scraper 8, which is convenient for temporary collection of impurities scraped off the filter screen 6, so that it is separated from the insulating oil inside the shell 1 to avoid secondary pollution.

[0027] In the embodiment of the present invention, magnetic sheets are provided on the upper surfaces of both ends of the cleaning plate 10, and magnetic plates with opposite magnetic properties to the magnetic sheets are provided on the lower surfaces of both ends of the filter screen 6. Therefore, when the drum 4 rotates and drives the filter screen 6 close to the collecting scraper 8, the filter screen 6 will be attracted to the cleaning plate 10 through the magnetic sheets and magnetic plates with opposite magnetic properties, and be attached to the lower surface of the filter screen 6. At the same time, the slide rod 12 is slidably arranged inside the transmission hole 11, which can not only rotate in the transmission hole 11, but also move left and right in the horizontal direction. Furthermore, fine bristles are provided on the arc-shaped outer wall of the cleaning shaft 13. At the same time, a strip-shaped limit block is provided on the arc-shaped outer wall of the right end of the slide rod 12, and a hole with a diameter matching the outer diameter of the slide rod 12 is opened at the axis center of the pinion 14. At the same time, a limit slot matching the above-mentioned strip limit block is opened on the inner surface of the hole, so that the slide rod 12 and the pinion 14 can only undergo relative displacement in the horizontal direction, and no relative rotation occurs.

[0028] In addition, the large gear 15 and the small gear 14 are meshed and transmit the information, and the arc-shaped outer wall of the contact plate 16 is kept in close contact with the lower surface of the filter 6, so that during the continuous rotation of the drum 4, the filter 6 is continuously pressed down and deflected. At this time, the cleaning plate 10 will slide along the lower surface of the filter 6, thereby driving the contact plate 16 to rotate, and through the mutual cooperation and transmission of the large gear 15 and the small gear 14, the slide rod 12 will drive the cleaning shaft 13 to rotate in the opposite direction to clean the impurities attached to the lower surface of the filter 6 and make them fall onto the collecting scraper 8 for collection, thereby ensuring the cleanliness of the surface of the filter 6, and then ensuring the purity of the insulating oil filled in the shell 1, so that it maintains good insulation performance and heat transfer performance.

[0029] In an embodiment of the present utility model, a limiting ball that is compatible with the wave groove 17 is provided on the arc-shaped inner surface of the transmission hole 11, and the limiting ball is arranged inside the wave groove 17. Therefore, during the rotation of the slide rod 12, it is restricted and guided by the wave groove 17 and the limiting ball. The slide rod 12 continues to rotate and performs a small reciprocating motion in the horizontal direction, thereby changing the operating path of the cleaning shaft 13 during the rotation process, so that it can better clean up the impurities attached to the filter 6 and improve the operating effect of the cleaning component.

[0030] In the present invention, when in use, by starting the idle motor 3, the filter 6 is driven by the drum 4 to rotate continuously, thereby stirring the insulating oil filled in the housing 1, and the filter 6 is continuously salvaged from the liquid surface and shallow position of the insulating oil to continuously filter out impurities in the insulating oil. In this process, the filter 6 is close to the collecting scraper 8, and under the action of the magnetic sheets and magnetic plates with opposite magnetic properties, the cleaning plate 10 is attracted to the lower surface of the filter 6. As the drum 4 continues to rotate, the filter 6 is pressed down, and the cleaning plate 10 slides along the lower surface of the filter 6, cooperating with the rotation of the contact plate 16, and through the mutual cooperation of the large gear 15 and the small gear 14, the slide rod 12 drives the cleaning shaft 13 to rotate in the opposite direction to clean the impurities attached to the lower surface of the filter 6 and make it fall onto the collecting scraper 8 for collection, thereby ensuring the cleanliness of the filter 6 surface, thereby ensuring the purity of the insulating oil filled in the housing 1, so as to maintain good insulation performance and heat transfer performance.

[0031] The above generally describes the present invention in detail. However, it is obvious to those skilled in the art that modifications or improvements may be made to the present invention. Therefore, modifications or improvements that do not depart from the spirit of the present invention are within the scope of protection of the present invention.

Claims

1. An oil-immersed transformer with a filtering device, comprising a housing (1), a cover plate (2) fixedly mounted on the top of the housing (1), an idle motor (3) fixedly mounted on the side wall of the housing (1), a roller (4) fixedly connected to the output end of the idle motor (3), a fixing rod (5) fixedly connected to the inner surface of the roller (4), a filter screen (6) passing through the fixing rod (5), and the filter screen (6) fixedly connected to the fixing rod (5), characterized in that: A cleaning component is provided below the cover plate (2), and the cleaning component comprises: A volute spring (7), the volute spring (7) being fixedly connected to the arc-shaped outer wall of the fixing rod (5), and a collecting scraper (8) being fixedly mounted on the lower surface of the cover plate (2); A connecting rod (9), the upper surface of the horizontal portion of the collecting scraper (8) is rotatably connected to the bottom end of the connecting rod (9), a top end side wall of the connecting rod (9) is hingedly connected to a cleaning plate (10), a transmission hole (11) is formed at the end of the cleaning plate (10), a sliding rod (12) penetrates the inner surface of the transmission hole (11), and the end of the sliding rod (12) is fixedly connected to a cleaning shaft (13); A small gear (14) is rotatably connected to the side wall of the cleaning plate (10), a large gear (15) is rotatably connected to the side wall of the cleaning plate (10), and the large gear (15) is coaxially fixedly connected to a contact plate (16), and a wave groove (17) is provided on the arc-shaped outer wall of the slide rod (12).

2. The oil-immersed transformer with a filter device according to claim 1, characterized in that: The end of the filter screen (6) is provided with a circular groove having a diameter greater than the outer diameter of the scroll spring (7), and the fixing rod (5) is arranged at the center of the circular groove, while the two ends of the scroll spring (7) are respectively fixedly connected to the arc-shaped outer wall of the fixing rod (5) and the bottom inner surface of the circular groove.

3. The oil-immersed transformer with a filter device according to claim 1, characterized in that: Magnetic sheets are provided on the upper surfaces of both ends of the cleaning plate (10), and magnetic plates having opposite magnetic properties to the magnetic sheets are provided on the lower surfaces of both ends of the filter screen (6).

4. The oil-immersed transformer with a filter device according to claim 1, characterized in that: A strip-shaped limit block is arranged on the arc-shaped outer wall at the right end of the slide bar (12), and a hole having a diameter matching the outer diameter of the slide bar (12) is opened at the axis of the pinion gear (14), and a limit sliding groove matching the strip-shaped limit block is opened on the inner surface of the hole.

5. The oil-immersed transformer with a filtering device according to claim 1, characterized in that: The large gear (15) meshes with the small gear (14) to achieve transmission, and the arc-shaped outer wall of the contact plate (16) is kept in close contact with the lower surface of the filter screen (6).

6. The oil-immersed transformer with a filter device according to claim 1, characterized in that: A limiting ball matched with the wave groove (17) is arranged on the arc-shaped inner surface of the transmission hole (11), and the limiting ball is arranged inside the wave groove (17).

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