Sensing device for oil-immersed transformer

Abstract

The utility model relates to the technical field of sensing devices, and discloses a sensing device for an oil-immersed transformer, the sensing device comprises a connecting pipe, a temperature sensor and an indicator, the temperature sensor is arranged in the connecting pipe, the connecting pipe is provided with an observation window, the indicator is sleeved on the temperature sensor, the temperature sensor is provided with a limiting block, the indicator is provided with a fixing block, and the connecting pipe is provided with an opening. The fixed block is provided with a fixed hole for the temperature sensor to pass through, the diameter of the fixed hole is smaller than the outer diameter of the limiting block, and the moving range of the indicator is smaller than the opening range of the observation window. The diameter of the fixed hole is smaller than the outer diameter of the limiting block, so that the moving range of the indicator is limited by the limiting block; therefore, the movement range of the indicator is smaller than the opening range of the observation window, so that a user can observe the position of the indicator from the observation window when using the sensing device, the situation that the user mistakenly thoughts that the sensing device goes wrong is greatly reduced, and the use experience of the user is improved.

Description

Technical Field

[0001] This application relates to the technical field of sensing devices, and in particular to a sensing device for an oil-immersed transformer. Background Art

[0002] An oil-immersed transformer is a voltage conversion device that uses oil cooling technology to minimize the temperature of the transformer. A sensing device is required in the oil-immersed transformer, and the sensing device monitors the oil level, oil temperature, and pressure parameters inside the oil tank of the oil-immersed transformer in real time.

[0003] In the related art, the sensing device includes a connecting pipe, a temperature sensor, an indicating mark, and a float. The indicating mark is slidably connected inside the connecting pipe, the float is fixed to the indicating mark, and the float can drive the indicating mark to float according to the height of the oil level. A through hole for the temperature sensor to pass through is provided on the surface of the indicating mark, the indicating mark is sleeved on the temperature sensor, and an observation window for observing the position of the indicating mark is provided on the connecting pipe.

[0004] People can observe the indicating mark at the observation window. When the oil level is too low, the float drives the indicating mark to drop. Since the indicating mark is sleeved on the temperature sensor, the range of up and down movement of the indicating mark may be much larger than the range of the observation window, so that the top of the indicating mark may be lower than the observation window, and thus the user cannot see the indicating mark at the observation window. The user may mistakenly think that there is a problem with the sensing device and consider the sensing device to be a defective product, which affects the user experience. Utility Model Content

[0005] In order to improve the problem of the excessive movement range of the indicating mark, this application provides a sensing device for an oil-immersed transformer.

[0006] A sensing device for an oil-immersed transformer provided by this application adopts the following technical solutions:

[0007] A sensing device for an oil-immersed transformer includes a connecting pipe, a temperature sensor, and an indicating mark. The temperature sensor is arranged inside the connecting pipe. An observation window is provided on the connecting pipe. The indicating mark is sleeved on the temperature sensor. A limiting block is arranged on the temperature sensor, and a fixing block is arranged on the indicating mark. A fixing hole for the temperature sensor to pass through is provided on the fixing block. The diameter of the fixing hole is smaller than the outer diameter of the limiting block, and the movement range of the indicating mark is smaller than the opening range of the observation window.

[0008] By adopting the above technical solution, since the diameter of the fixing hole is smaller than the outer diameter of the limiting block, the limiting block can limit the fixing block. Coupled with the fact that the fixing block is arranged on the indicating mark, the moving range of the indicating mark is restricted by the limiting block, so that the moving range of the indicating mark is smaller than the opening range of the observation window. This enables the user to observe the position of the indicating mark through the observation window when using the sensing device, greatly reducing the situation where the user mistakenly believes that the sensing device has problems and enhancing the user experience.

[0009] Optionally, the fixing block is frustum-shaped.

[0010] By adopting the above technical solution, through the frustum-shaped design, due to its gradually decreasing diameter, it is convenient for the fixing block to be inserted into the indicating mark, reducing the jamming phenomenon during the installation of the fixing block. At the same time, the frustum-shaped design can disperse the stress generated by fixing, avoiding excessive stress concentration at the edge of the fixing hole, and prolonging the service life of the fixing block and the temperature sensor.

[0011] Optionally, a through hole for the temperature sensor to pass through is provided on the indicating mark, and the fixing block is embedded in the through hole.

[0012] By adopting the above technical solution, by embedding the fixing block in the through hole, there is an interference fit between the fixing block and the hole wall of the through hole, making the fixation between the indicating mark and the fixing block more reliable, reducing the possibility of the fixing block detaching from the through hole, and further strengthening the limiting effect of the fixing block on the indicating mark.

[0013] Optionally, the surface of the fixing block facing the limiting block and the surface of the indicating mark facing the limiting block are coplanar.

[0014] By adopting the above technical solution, since the surface of the fixing block facing the limiting block and the surface of the indicating mark facing the limiting block are coplanar, when the limiting block abuts against the fixing block, the indicating mark can be restricted by the limiting block, making the moving range of the indicating mark the same as the moving range of the limiting block, enabling the personnel detecting the sensing device to more easily detect the moving range of the indicating mark and greatly reducing the error in judging the moving range of the indicating mark.

[0015] Optionally, a red indicating member and a blue indicating member are provided on the indicating mark. The red indicating member is arranged on the blue indicating member. A distance measuring portion is provided on the red indicating member. The distance measuring portion is used for the infrared distance measuring device to detect the distance, and the diameter of the distance measuring portion is larger than the outer diameter of the red indicating member.

[0016] By adopting the above technical solution, the ranging part is detected by the infrared ranging device, and the diameter of the ranging part is made larger than the outer diameter of the red indicator, so that the infrared ranging device can measure the distance of the ranging part more accurately, and reduce the situation that it is difficult for the ranging part to get out of the detection range of the infrared ranging device when the indicator shakes. That is, the ranging part with a larger diameter can be more easily identified by the infrared ranging device, improving the stability of the measurement.

[0017] Optionally, it further includes a housing, the housing is arranged on the connecting pipe, a circuit board is arranged inside the housing, an infrared ranging device is arranged on the circuit board, a ranging hole is opened on the circuit board, and the infrared ranging device passes through the ranging hole to measure the distance of the ranging part.

[0018] By adopting the above technical solution, the infrared ranging device passes through the ranging hole to measure the distance of the ranging part, so that the infrared ranging device and the ranging part will not be affected by the circuit board, and the hole wall of the ranging hole protects the infrared ranging device, reducing the situation of shaking and offset of the infrared ranging device. Thus, the infrared ranging device can measure the distance of the ranging part more stably, making the measurement result more accurate.

[0019] Optionally, an installation strip is arranged on the infrared ranging device, an installation hole for the installation strip to pass through is opened on the circuit board, and an installation nut for threaded connection is arranged on the installation strip.

[0020] By adopting the above technical solution, the installation strip passes through the installation hole, so that the installation strip reduces damage to the circuit board, and the installation strip is arranged on the infrared ranging device, making it difficult for the infrared ranging device to damage the circuit board during the installation process, and prolonging the service life of the circuit board.

[0021] Optionally, an installation bolt is arranged on the installation strip, an installation groove for the installation bolt to be inserted is opened on the installation strip, and the installation bolt passes through the infrared ranging device and is threadedly connected to the installation groove.

[0022] By adopting the above technical solution, the installation bolt passes through the infrared ranging device and is threadedly connected to the installation groove, so that the installation bolt and the installation strip are fixed, and the installation bolt can fix the infrared ranging device on the installation strip, reducing the movement between the infrared ranging device and the installation strip, and making the infrared ranging device measure the distance of the ranging part more stably.

[0023] In summary, the present application includes at least one of the following beneficial technical effects:

[0024] 1. The diameter of the fixing hole is smaller than the outer diameter of the limiting block, so that the limiting block can limit the fixing block. Coupled with the fact that the fixing block is arranged on the indicating mark, the moving range of the indicating mark is restricted by the limiting block, thereby making the moving range of the indicating mark smaller than the opening range of the observation window. This enables the user to observe the position of the indicating mark through the observation window when using the sensing device, greatly reducing the situation where the user mistakenly believes that the sensing device has problems and enhancing the user experience.

[0025] 2. By embedding the fixing block into the through hole, an interference fit exists between the fixing block and the hole wall of the through hole, making the fixation between the indicating mark and the fixing block more reliable, reducing the possibility of the fixing block detaching from the through hole, and further strengthening the limiting effect of the fixing block on the indicating mark. Description of the Drawings

[0026] Figure 1 is a schematic structural diagram of an embodiment of the present application;

[0027] Figure 2 is a schematic structural diagram highlighting the indicating mark in an embodiment of the present application;

[0028] Figure 3 is along Figure 2 a partial cross-sectional view taken along line A-A in

[0029] Figure 4 is an exploded schematic diagram highlighting the circuit board in an embodiment of the present application;

[0030] Figure 5 is Figure 4 an enlarged schematic diagram of part B in

[0031] Reference Numerals: 1, housing; 11, circuit board; 111, ranging hole; 112, mounting hole; 12, infrared ranging device; 121, induction part; 122, detection part; 123, groove; 13, mounting strip; 131, mounting rod; 132, mounting groove; 14, mounting nut; 15, mounting bolt; 2, connecting pipe; 21, observation window; 3, temperature sensor; 31, limiting block; 4, indicating mark; 41, floating block; 42, through hole; 43, fixing block; 431, fixing hole; 44, red indicating member; 441, ranging part; 45, blue indicating member. Detailed Description of the Embodiment

[0032] The following will further elaborate on the present application in conjunction with the attached Figures 1-5 drawings.

[0033] This embodiment discloses a sensing device for an oil-immersed transformer. Refer to Figure 1 and Figure 2, A sensing device for an oil-immersed transformer, comprising a housing 1, a connecting pipe 2, a temperature sensor 3 and an indicating mark 4. The housing 1 is threadedly connected to the connecting pipe 2. The temperature sensor 3 passes through the connecting pipe 2 and is fixed inside the housing 1. The indicating mark 4 is slidably connected to the temperature sensor 3. A floating block 41 is fixedly connected to the indicating mark 4, and the floating block 41 floats according to the height of the oil level. When the oil level changes, the floating block 41 drives the indicating mark 4 to slide along the height direction of the temperature sensor 3. An observation window 21 is provided on the connecting pipe 2, and people can observe the position of the indicating mark 4 through the observation window 21.

[0034] Referring to Figure 2 and Figure 3 , A limiting block 31 is integrally formed on the end face of the temperature sensor 3, and the diameter of the limiting block 31 is larger than the diameter of the temperature sensor 3. A through hole 42 for the temperature sensor 3 to pass through is provided on the end face of the indicating mark 4, and the inner diameter of the through hole 42 is larger than the outer diameter of the limiting block 31.

[0035] Referring to Figure 3 , A fixing block 43 is provided on the indicating mark 4, and the fixing block 43 is frustum-shaped. A fixing hole 431 for the temperature sensor 3 to pass through is provided on the end face of the fixing block 43. The inner diameter of the fixing hole 431 is larger than the diameter of the temperature sensor 3 and smaller than the outer diameter of the limiting block 31, that is, the limiting block 31 cannot pass through the fixing hole 431, so that the limiting block 31 limits the fixing block 43.

[0036] Referring to Figure 3 , The fixing block 43 is embedded in the through hole 42. At this time, there is an interference fit between the fixing block 43 and the hole wall of the through hole 42, and then the fixing block 43 and the indicating mark 4 are fixed by gluing. The surface of the fixing block 43 facing the limiting block 31 and the surface of the indicating mark 4 facing the limiting block 31 are coplanar, and the surface of the fixing block 43 facing the limiting block 31 and the surface of the floating block 41 facing the limiting block 31 are coplanar.

[0037] Referring to Figure 1 and Figure 2 , A red indicating member 44 and a blue indicating member 45 are fixedly connected to the indicating mark 4. The red indicating member 44 is located on the side of the blue indicating member 45 away from the fixing block 43. A ranging portion 441 is integrally formed on the surface of the red indicating member 44. People can observe the red indicating member 44 and the blue indicating member 45 through the observation window 21, and know the height of the oil level by seeing the red indicating member 44 or the blue indicating member 45.

[0038] Referring to Figure 2 and Figure 4 , A circuit board 11 is provided inside the housing 1. An infrared ranging device 12 is electrically connected to the circuit board 11. The infrared ranging device 12 can detect the distance of the ranging portion 441. The infrared ranging device 12 includes a sensing portion 121 and a detecting portion 122.

[0039] Referring to Figure 2 and Figure 5 , a ranging hole 111 is formed in the circuit board 11 for the sensing part 121 of the infrared ranging device 12 to pass through. The sensing part 121 of the infrared ranging device 12 passes through the ranging hole 111 to detect the ranging part 441, and the detecting part 122 of the infrared ranging device 12 is located on the circuit board 11.

[0040] Referring to Figure 5 , a plurality of mounting bars 13 and a plurality of mounting nuts 14 are provided on the infrared ranging device 12. The cross-section of the mounting bar 13 is a regular hexagon. A mounting rod 131 is integrally formed on the end face of the mounting bar 13. The mounting rod 131 is threadedly connected to the mounting nut 14. A mounting hole 112 for the mounting rod 131 to pass through is formed in the circuit board 11. The diameter of the mounting hole 112 is smaller than the outer diameter of the mounting bar 13. When the mounting rod 131 passes through the mounting hole 112 and is threadedly connected to the mounting nut 14, the mounting bar 13 can be fixed to the circuit board 11.

[0041] Referring to Figure 5 , a mounting groove 132 is formed in the end face of the mounting bar 13 away from the mounting rod 131. A mounting bolt 15 is provided on the mounting bar 13. A groove 123 is formed in the detecting part 122 of the infrared ranging device 12. The mounting bar 13 is inserted into the groove 123. When the mounting bar 13 is inserted into the groove 123, the mounting bolt 15 passes through the detecting part 122 of the infrared ranging device 12 and is threadedly connected to the mounting groove 132, realizing the mutual fixation of the mounting bar 13 and the mounting bolt 15, and fixing the detecting part 122 of the infrared ranging device 12 to the circuit board 11.

[0042] The implementation principle of a sensing device for an oil-immersed transformer in an embodiment of the present application is as follows: Through the limitation of the fixed block 43 by the limiting block 31, the moving range of the fixed block 43 is fixed, so that the moving range of the indicating mark 4 is fixed.

[0043] Unless otherwise defined, the technical terms or scientific terms used in this application shall have the ordinary meanings as understood by those of ordinary skill in the art to which this application pertains. The terms "first", "second", "third" and similar terms used in the description and claims of this application do not denote any order, quantity or importance, but are merely used to distinguish different components. The terms such as "a" or "an" do not denote a limitation of quantity, but rather denote the presence of at least one. The terms such as "comprising" or "including" mean that the elements or items appearing before "comprising" or "including" cover the elements or items listed after "comprising" or "including" and their equivalents, and do not exclude other elements or items. The terms such as "upper", "lower", "left", "right" are only used to indicate relative positional relationships, and when the absolute position of the object being described changes, the relative positional relationships may also change accordingly.

[0044] The foregoing are only the preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent replacements, improvements, etc. made within the design concept of this application shall be included within the protection scope of this application.

Claims

1. A sensing device for an oil-immersed transformer, comprising a connecting tube (2), a temperature sensor (3) and an indicator (4), wherein the temperature sensor (3) is arranged in the connecting tube (2), an observation window (21) is provided on the connecting tube (2), and the indicator (4) is sleeved on the temperature sensor (3), characterized in that: The temperature sensor (3) is provided with a limit block (31), the indicator mark (4) is provided with a fixing block (43), the fixing block (43) is provided with a fixing hole (431) for the temperature sensor (3) to pass through, the diameter of the fixing hole (431) is smaller than the outer diameter of the limit block (31), and the moving range of the indicator mark (4) is smaller than the opening range of the observation window (21).

2. A sensor device for an oil-immersed transformer according to claim 1, characterized in that: The fixing block (43) is in the shape of a truncated cone.

3. A sensor device for an oil-immersed transformer according to claim 1, characterized in that: The indicator mark (4) is provided with a through hole (42) for the temperature sensor (3) to pass through, and the fixing block (43) is embedded in the through hole (42).

4. A sensor device for an oil-immersed transformer according to claim 1, characterized in that: The surface of the fixing block (43) facing the limiting block (31) and the surface of the indicator mark (4) facing the limiting block (31) are coplanar.

5. The sensing device for an oil-immersed transformer according to claim 1, characterized in that: The indicator mark (4) is provided with a red indicator (44) and a blue indicator (45); the red indicator (44) is arranged on the blue indicator (45); the red indicator (44) is provided with a distance measuring portion (441); the distance measuring portion (441) is used for an infrared distance measuring device (12) to detect distance; the diameter of the distance measuring portion (441) is greater than the outer diameter of the red indicator (44).

6. A sensor device for an oil-immersed transformer according to claim 5, characterized in that: The invention also comprises a shell (1), wherein the shell (1) is arranged on the connecting pipe (2), a circuit board (11) is arranged inside the shell (1), an infrared distance measuring device (12) is arranged on the circuit board (11), a distance measuring hole (111) is opened on the circuit board (11), and the infrared distance measuring device (12) passes through the distance measuring hole (111) to measure the distance of the distance measuring part (441).

7. A sensor device for an oil-immersed transformer according to claim 6, characterized in that: The infrared distance measuring device (12) is provided with a mounting strip (13), the circuit board (11) is provided with a mounting hole (112) for the mounting strip (13) to pass through, and the mounting strip (13) is provided with a mounting nut (14) for threaded connection.

8. The sensing device for an oil-immersed transformer according to claim 7, characterized in that: The mounting strip (13) is provided with a mounting bolt (15), and the mounting strip (13) is provided with a mounting groove (132) for inserting the mounting bolt (15). The mounting bolt (15) passes through the infrared distance measuring device (12) and is threadedly connected in the mounting groove (132).

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