JP2019095341A - Liquid surface display device and liquid-cooled electric apparatus - Google Patents

Abstract

To enable a liquid surface in a liquid tank to be easily confirmed using a relatively simple configuration.SOLUTION: A liquid surface display device pertaining to an embodiment comprises: a moving member that moves in the vertical direction in linkage with a change of the liquid surface of a liquid arranged in a liquid tank where the liquid is stored; a display for displaying the position of the height of the liquid surface of the liquid; and a cord member connected at one end to the moving member. The display includes a case in which the other end of the cord member is introduced, a dial and display hand provided at the front of the case, and a hand drive mechanism for moving the display hand and provided in the case. The hand drive mechanism includes, in the case, a fixed pulley, and a movable pulley provided movably relative to the fixed pulley in the vertical direction within a prescribed range, with the vertical move transmitted to the display hand, and also is constituted so that the other end portion of the cord member introduced into the case is alternately put on the fixed pulley and the movable pulley while being folded back.SELECTED DRAWING: Figure 1

Description

  Embodiments of the present invention relate to a liquid level display device and a liquid cooled electrical device.

  Among liquid-cooled electric devices, for example, oil-filled transformers, ones are known which are configured to store a transformer body together with a cooling liquid such as insulating oil or liquid silicone in a storage container (liquid tank). . Such an oil-filled transformer is required to be able to confirm the remaining amount of cooling fluid from the outside of the fluid tank storing the cooling fluid at the time of installation (at the time of first pouring) and at the time of maintenance. In this case, in the case of a large oil-filled transformer, the liquid level of the coolant also comes to a high position, which makes it difficult for the operator to directly view the liquid level inside the liquid tank.

  Conventionally, to check the oil level of the oil-filled transformer's conservator, one end of the line gauge is connected to the bottom of the conservator's air bag, and the other end of the line gauge to the line storage box outside the conservator An oil level detection device having a derived configuration is considered (see, for example, Patent Document 1). However, in this configuration, every time the operator tries to check the oil level, the box for storing the line gauge has to be removed and the line gauge needs to be stretched, which is troublesome.

Japanese Patent Laid-Open No. 6-61069

The above-described conventional oil level detection device has a problem that the configuration is relatively complicated and the confirmation operation is complicated, and the operator easily performs the operation of checking the liquid level in the liquid tank while the configuration is simple. A liquid level display device that can be used is desired.
There are various standards for the oil-filled transformer as described above, and the capacity of the cooling fluid and hence the displacement width of the liquid surface greatly differ depending on the size of the liquid tank. For example, in some small ones, the liquid level goes up and down with a width of about 50 mm, and in the large ones, some go up and down with a width of 500 mm. Therefore, it would be very useful to be able to provide a liquid level display device that can be shared for a plurality of types of liquid-cooled electrical devices in which the upper and lower displacement widths of the liquid level are different.

  Therefore, a liquid level display device capable of easily confirming the liquid level in the liquid tank and having a relatively simple configuration, and a liquid-cooled type electric liquid display device including the liquid level display device Provide equipment.

  The liquid level display device according to the embodiment is disposed in the liquid tank in which the liquid is stored, and a moving member that moves up and down in conjunction with the fluctuation of the liquid level of the liquid, and the height of the liquid level of the liquid The display device includes a display for displaying a position, and a string member having one end connected to the moving member, the display being provided in a case into which the other end of the string member is introduced, and a front surface of the case A scale plate and a display needle, and a needle drive mechanism provided in the case for operating the display needle, the needle drive mechanism including a fixed pulley and a vertical pulley with respect to the fixed pulley in the case. And a moving pulley provided so as to be movable within a predetermined range and whose vertical movement is transmitted to the display needle, and the other end side portion of the cord member introduced into the case is the fixed pulley and the moving pulley. It is constituted by being alternately hung while being turned up and down on the pulley To have.

  The liquid-cooled type electric device according to the embodiment is a liquid-cooled type electric device in which a device body is housed in a liquid tank and a liquid for insulation and cooling of the device body is housed, The liquid level display device according to any one of to 8.

1, showing an embodiment, is a partial vertical front view schematically showing an overall configuration of an oil-filled insulation transformer. An enlarged longitudinal front view showing the configuration of the moving member portion disposed in the liquid tank of the oil-filled insulation transformer A perspective view schematically showing an internal configuration of a liquid level display device Side view schematically showing the configuration of a needle drive mechanism The figure which shows typically how to attach the string member to the pulley in the case of 50 mm (1: 1) of fluctuation width D, and a figure which shows a mode that a movable axis is in a lower end position (a) and an upper end position (b) The figure which shows typically how to attach the string member to the pulley in the case of fluctuation range D being 100 mm (1: 2), and showing a mode that a movable axis is in a lower end position (a) and an upper end position (b) A diagram schematically showing how the string member is hooked on the pulley when the fluctuation width D is 150 mm (1: 3), showing the movable shaft at the lower end position (a) and the upper end position (b) The figure which shows typically how to attach the string member to the pulley in the case where the fluctuation | variation width | variety D is 200 mm (1: 4), and a mode that a movable axis is in lower end position (a) and upper end position (b) The figure which shows typically how to attach the string member to the pulley in the case where the fluctuation | variation width | variety D is 500 mm (1:10), and a mode that a movable axis exists in a lower end position (a) and an upper end position (b)

  Hereinafter, an embodiment applied to an oil filled insulation transformer will be described with reference to the drawings. FIG. 1 schematically shows the overall configuration of an oil-filled insulation transformer 1 as a liquid-cooled electrical device according to the present embodiment. The oil-filled insulation transformer 1 is configured, for example, by housing a transformer main body (not shown) as a device main body in a liquid tank 2 made of metal. The liquid tank 2 is configured in a rectangular box shape slightly longer in FIG. 1 and is sealed. The liquid tank 2 is at ground potential. Although not shown, the transformer body has a known configuration in which, for example, three molded coils are mounted on an iron core.

  In the liquid tank 2, an insulating oil 3 as a cooling liquid (liquid) is filled up near the ceiling so that the entire transformer body is immersed. For example, mineral oil is employed as the insulating oil 3. In FIG. 1 and FIG. 2, the height position of the liquid level which is the oil level of the insulating oil 3 is indicated by the symbol S. As a result, although the outer peripheral part of the coil of the transformer main body, the cable part for connection, etc. are used as a high voltage charging part, the entire charging part is immersed in the insulating oil 3 and the insulation and cooling are shown. It is done.

  At this time, while the transformer is in operation, the liquid level S of the insulating oil 3 fluctuates up and down along with expansion and contraction due to temperature. In the liquid tank 2, the liquid level S of the insulating oil 3 is equal to or higher than the lowest liquid level (L) necessary for insulation and cooling of the transformer main body, and a slight distance between the liquid level S and the ceiling of the liquid tank 2 It is stored so as to be below the highest liquid level (H) to secure the gap. The fluctuation range of the liquid level S of the insulating oil 3 in the liquid tank 2 is D. The fluctuation range D differs depending on the specification of the oil-filled transformer 1 and hence the size of the liquid tank 2. For example, the fluctuation range D is about 50 mm in a small size, and the fluctuation range D is large in a large size. Some are about 500 mm.

  And, in the oil filled insulation transformer 1 of the present embodiment, the liquid level display for the operator to know from the outside (visualize) the height position of the liquid level S of the insulating oil 3 in the liquid tank 2 A device 4 is provided. Hereinafter, the liquid level display device 4 according to the present embodiment will be described in detail with reference to FIGS. The liquid level display device 4 is a display for displaying the height position of the liquid level S of the floating oil 5 and the insulating oil 3 as a moving member moving up and down in conjunction with the fluctuation of the liquid level S of the insulating oil 3 6 comprises a cord member 7 one end of which is connected to the float 5;

  Among them, as shown in FIGS. 1 and 2, the float 5 has a flat cylindrical shape, for example, made of plastic and is hollow and floats on the liquid surface S of the insulating oil 3, that is, the vertical movement of the liquid surface S. It is arranged to move up and down in conjunction with the. As shown in FIG. 2, the string member 7 is made of, for example, a metal wire, and one end of the string member 7 is connected to the upper surface central portion of the float 5. The cord member 7 is configured to be flexibly bendable, and is drawn out through a circular opening 8 formed on the upper surface of the liquid tank 2.

  Further, between the upper surface outer peripheral portion of the float 5 and the circular opening 8, a cylindrical bellows-like expansion and contraction member 9 made of rubber or soft plastic can extend and contract in the vertical direction so as to connect them vertically. Is configured. As a result, the string member 7 is led to the outside through the inside of the stretchable member 9, and the vapor of the insulating oil 3 and the like is prevented from entering the stretchable member 9. As shown in FIG. 1, the display 6 is attached to the outer surface, in this case, the front surface of the liquid tank 2, at a height position easy for the operator to see. At this time, a connecting pipe 11 is provided so as to connect the circular opening 8 and the case 10 of the display 6, and the string member 7 drawn from the circular opening 8 passes through the connecting pipe 11. It is introduced into the case 10 of the display 6.

  Now, the display 6 will be described in detail. The display 6 is, as partially shown in FIG. 3 and the like, a case 10 into which the other end of the string member 7 is introduced, and a scale plate 12 and a display needle 13 provided on the front surface of the case 10. A needle driving mechanism 14 provided in the case 10 for operating the display needle 13 is provided. The case 10 is formed in a rectangular box shape elongated in the vertical direction, and a transparent plate such as glass is disposed on the front surface of the case 10 so that the scale plate 12 and the display needle 13 can be viewed visually.

  As shown in FIGS. 1 and 3, the scale plate 12 has a rectangular plate shape long in the vertical direction, and a scale is provided in the vertical direction. In this case, the scale plate 12 is located at the lower part, with a scale of "LOW" indicating the lowest liquid level, and located at the upper part, a scale of "HIGH" indicating the highest liquid level. Along with this, it is divided so that they are divided into five, and the number "20", which indicates the ratio of the height of the liquid surface S when the lowest liquid level is 0% and the highest liquid level is 100%. Scales of 40 "," 60 "and" 80 "are shown.

  The display needle 13 has a needle shape pointing from the right side to the left side to any scale of the scale plate 12 and can be moved up and down through a slit 15 formed on the right side of the scale plate 12 extending vertically. It is provided. In this case, the actual dimension in the vertical direction between the "LOW" scale and the "HIGH" scale of the scale plate 12 is, for example, 50 mm. Thus, in the present embodiment, the maximum movement range dmax (see FIGS. 3 and 5 to 9) of the display needle 13 in the vertical direction with respect to the scale plate 12 is 50 mm.

  As shown in FIG. 3 and FIG. 4 etc., the needle drive mechanism 14 is provided at the upper part in the case 10 and equipped with a constant pulley 16 and is located below the constant pulley 16 in a predetermined range in the vertical direction The movable pulley 17 is movable at the The vertical movement of the movable pulley 17 is transmitted to the display needle 13 to be driven. The other end portion of the string member 7 introduced into the case 10 is alternately hooked to the fixed pulley 16 and the moving pulley 17 while being folded up and down.

  At this time, a plurality of, for example, five constant pulleys 16 are rotatably juxtaposed to the fixed shaft 18 extending in the horizontal longitudinal direction at the upper portion in the case 10, and arranged in parallel so as not to move in the longitudinal direction. A plurality of, for example, five of the moving pulleys 17 are rotatably and immovably attached to the movable shaft 19 as a shaft portion extending in the horizontal back and forth direction below the constant pulley 16 in the case 10. It is set up. The fixed shaft 18 is fixedly mounted in the case 10. The movable shaft 19 is held so as to be horizontally movable in the vertical direction by a support portion 20 (see FIG. 3) in which the rear end side is provided in the case 10.

  In addition, in the following, when the plurality of fixed pulleys 16 are distinguished, the first fixed pulley 16 (A), the second fixed pulley 16 (B), and the third fixed pulley 16 (C) in order from the front side , The fourth constant pulley 16 (D), the fifth constant pulley 16 (E) (see FIG. 9). In order to distinguish the plurality of moving pulleys 17, similarly, from the front side, the first moving pulley 17 (A), the second moving pulley 17 (B), and the third moving pulley 17 (C), The fourth moving pulley 17 (D) and the fifth moving pulley 17 (E) are referred to (see FIG. 9). As shown in FIG. 4, the fixed pulley 16 and the moving pulley 17 are disposed at slightly offset positions in the front-rear direction and at offset positions by a half pitch.

  The distal end of the movable shaft 19 protrudes to the front side of the scale plate 12 through the slit 15, and the display needle 13 is attached to the distal end. In this case, the maximum movement range dmax of the movable shaft 19 and thus the plurality of moving pulleys 17 in the vertical direction coincides with the maximum movement range dmax of the display hand 13. Further, as schematically shown in FIG. 4, the movable shaft 19 and hence the plurality of moving pulleys 17 are biased downward (lower end position) by the biasing means, but in the present embodiment, A spring spring 21 is provided as the biasing means.

  The other end portion of the cord member 7 is introduced into the case 10 through the introduction port 10a (see FIGS. 5 to 9) of the side surface of the case 10, and is hung from above on the first fixed pulley 16 (A) first Be Thereafter, the first movable pulley 17 (A), the second fixed pulley 16 (B),... Are alternately hooked while being turned up and down. At this time, a fixed mounting portion 22 and a movable mounting portion 23 for fixing the other end of the string member 7 are provided in the case 10. Among them, as shown in FIG. 4, FIG. 6, FIG. 8, and FIG. 9, the fixed attachment portion 22 is provided in the vicinity (5 places) above the upper end position of the movable shaft 17 in the vicinity of each fixed pulley 16. ing. As shown in FIGS. 5 and 7, the movable attachment portions 23 are provided on each moving pulley 17 (five places).

  In the needle drive mechanism 14 of the present embodiment, as described in the following description of the operation, the constant pulley 16 and the moving pulley 17 on which the string member 7 is hung according to the fluctuation width D of the liquid surface S in the liquid tank 2 The number, that is, the number of folds of the string member 7 is set. In this case, the relationship between the movement range d of the display needle 13 with respect to the scale plate 12 and the fluctuation width D of the liquid surface S in the liquid tank 2 is 1: N (N is a natural number, but 10 is the maximum in this embodiment) It is set to be In this case, the value of N matches the number of turns of the string member 7. The length of the entire string member 7 (the part introduced into the case 10) also varies depending on the degree of the number of turns back, and the length is made an appropriate length according to the number of turns back.

  To give a specific example, since the maximum movement range dmax of the movable shaft 18 (display needle 13) is 50 mm, for example, if the fluctuation width D of the liquid surface S in the liquid tank 2 is 50 mm or less, N = 1 That is, d: D is 1: 1. When the fluctuation range D is more than 50 mm and 100 mm or less, N = 2, that is, d: D is set to 1: 2. When the fluctuation range D exceeds 100 mm and is 150 mm or less, N = 3, that is, d: D is set to 1: 3. Although the middle part is omitted, similarly, in the case where the fluctuation range D is more than 450 mm and 500 mm or less, N = 10, that is, d: D is set to 1:10.

  At this time, in the needle drive mechanism 14, when the liquid level S in the liquid tank 2 is below, the moving pulley 17, that is, the movable shaft 19 is located below and the liquid level S is above. The string member 7 is hung on the fixed pulley 16 and the moving pulley 17 so that the moving pulley 17 or the movable shaft 19 is located on the upper side. Therefore, when the value of N is an odd number, the end of the string member 7 is attached to one of the movable attachment portions 23 of the moving pulley 17, and when the value of N is an even number, the end of the string member 7 is Is fixedly attached to one of the fixed attachment portions 22.

  Next, the operation of the liquid level display device 4 having the above configuration will be described. As described above, in the display 6, the number of constant pulleys 16 and moving pulleys 17 on which the other end side of the string member 7 introduced into the case 10 is hooked, that is, the string member 7 in the needle drive mechanism 14 is folded back The number is set according to the fluctuation range D of the liquid surface S in the liquid tank 2 such that the relationship between the movement range d of the display needle 13 and the fluctuation range D is 1: N (N is a natural number) Ru. 5 to 9 illustrate cases where the value of N is 1, 2, 3, 4, 10, respectively, and will be described in order below. In FIGS. 5 to 9, for convenience, the fixed pulley 16 and the moving pulley 17 are schematically illustrated in the form of being horizontally arranged and planarly arranged.

  As shown in FIG. 5, for example, when the fluctuation range D of the liquid surface S (difference between the lowest liquid level and the highest liquid level) in the liquid tank 2 is 50 mm, N = 1, that is, the number of folds becomes one. It is set. That is, after the string member 7 introduced from the introduction port 10a of the case 10 is hung on the first fixed pulley 16 (A), the end (other end) thereof is attached to the first moving pulley 17 (A) It is fixed to the provided movable mounting portion 23. In this case, as shown in FIG. 5A, when the liquid level S of the insulating oil 3 in the liquid tank 2 is at the lowest level, the float 5 is at the position L1 in the figure, and the movable shaft 19 The string member 7 is hung without slack so that the display needle 13 comes to the lower end position (LOW). At this time, the movable shaft 19 (moving pulley 17) is biased downward (lower end position) by the mainspring spring 21.

  When the liquid surface S of the insulating oil 3 rises from the state of FIG. 5A, with the rise of the float 5, the other end of the string member 7 is pulled in the direction of being discharged from the case 10 by its buoyancy. The movable shaft 19 (moving pulley 17) moves upward against the spring force of the mainspring spring 21. At this time, as shown in FIG. 5B, when the liquid level S of the insulating oil 3 in the liquid tank 2 rises 50 mm to the highest liquid level, the float 5 moves to the position of H1 in the figure, and the movable shaft 19 As a result, the display hand 13 comes to the upper end position (HIGH).

  Thus, according to the position of the float 5 floating on the liquid surface S of the insulating oil 3, the length of the portion introduced into the case 10 of the string member 7 varies, and the needle drive mechanism 14 The change in length of 7 can be converted to the upper and lower positions of the moving pulley 17 (movable shaft 19) and transmitted to the display needle 13 to display the height position of the liquid surface S on the display 6. The operator can see the position of the display needle 13 of the display 6 to know the position of the liquid level S of the insulating oil 3 in the liquid tank 2, and whether the necessary amount of insulating oil 3 is stored. Can be easily confirmed. In this case, in the configuration of FIG. 5, the relationship between the movement range d of the display needle 13 with respect to the scale plate 12 and the fluctuation width D of the liquid surface S is 1: 1.

  As shown in FIG. 6, for example, when the fluctuation width D of the liquid surface S in the liquid tank 2 is 100 mm, N = 2, that is, the number of folds of the string member 7 is set to two. In this case, the string member 7 introduced from the introduction port 10a is hung on the first fixed pulley 16 (A) and the first moving pulley 17 (A) in that order, and then its end (the other end) Is fixed to the upper fixed attachment 22. As shown in FIG. 6A, when the liquid level S of the insulating oil 3 in the liquid tank 2 is at the lowest level, the float 5 is at the position L2 in the figure, and the movable shaft 19 and thus the display needle 13 So that the lower end position (LOW), the string member 7 is hung without slack.

  As shown in FIG. 6 (b), when the liquid surface S of the insulating oil 3 in the liquid tank 2 rises 100 mm to the highest liquid level, the float 5 moves to the position of H2 in the figure. However, the amount of movement of the movable pulley 17 is 1⁄2 of the amount of movement of the string holding member 7, so that the movable shaft 19 and thus the display needle 13 ascend by 50 mm and come to the upper end position (HIGH). In this case, in the configuration of FIG. 6, the relationship between the movement range d of the display needle 13 with respect to the scale plate 12 and the fluctuation width D of the liquid surface S is 1: 2.

  As shown in FIG. 7, for example, when the fluctuation width D of the liquid surface S in the liquid tank 2 is 150 mm, N = 3, that is, the number of folds of the string member 7 is set to three. In this case, the string member 7 introduced from the introduction port 10a is hung on the first fixed pulley 16 (A), the first moving pulley 17 (A), and the second fixed pulley 16 (B) in this order. After that, the end (the other end) is fixed to the movable mounting portion 23 provided on the second moving pulley 17 (B). As shown in FIG. 7A, when the liquid level S of the insulating oil 3 in the liquid tank 2 is at the lowest level, the float 5 is at the position L3 in the figure, and the movable shaft 19 and thus the display needle 13 Comes to the lower end position (LOW).

  As shown in FIG. 7 (b), when the liquid level S of the insulating oil 3 in the liquid tank 2 rises 150 mm to the highest liquid level, the float 5 moves to the position of H3 in the figure. However, since the moving amount of the moving pulley 17 is 1/3 of the moving amount of the string holding member 7, the movable shaft 19 and thus the display needle 13 are lifted by 50 mm and come to the upper end position (HIGH). In this case, in the configuration of FIG. 7, the relationship between the movement range d of the display needle 13 with respect to the scale plate 12 and the fluctuation width D of the liquid surface S is 1: 3.

  As shown in FIG. 8, for example, when the fluctuation width D of the liquid surface S in the liquid tank 2 is 200 mm, N = 4, that is, the number of folds of the string member 7 is set to four. In this case, the string member 7 introduced from the introduction port 10a is the first fixed pulley 16 (A), the first moving pulley 17 (A), the second fixed pulley 16 (B), the second After being sequentially hung on the moving pulley 17 (B), the end (the other end) is fixed to the upper fixed mounting portion 22. As shown in FIG. 8A, when the liquid level S of the insulating oil 3 in the liquid tank 2 is at the lowest level, the float 5 is at the position L4 in the figure, and the movable shaft 19 and thus the display needle 13 Comes to the lower end position (LOW).

  As shown in FIG. 8 (b), when the liquid level S of the insulating oil 3 in the liquid tank 2 rises 200 mm to the highest liquid level, the float 5 moves to the position of H4 in the figure. However, the amount of movement of the movable pulley 17 is 1⁄4 of the amount of movement of the string holding member 7, so that the movable shaft 19 and thus the display needle 13 ascend by 50 mm and come to the upper end position (HIGH). In this case, in the configuration of FIG. 8, the relationship between the movement range d of the display needle 13 with respect to the scale plate 12 and the fluctuation width D of the liquid surface S is 1: 4.

  Although the description regarding the case where the value of N is 5 to 9 will be omitted, as shown in FIG. 9, for example, when the fluctuation width D of the liquid surface S in the liquid tank 2 is 500 mm, N = 10, that is, the string member 7 Is set so that the number of turnbacks of is 10. In this case, the string member 7 introduced from the introduction port 10a is the first fixed pulley 16 (A), the first moving pulley 17 (A), the second fixed pulley 16 (B), the second Moving pulley 17 (B), third fixed pulley 16 (C), third moving pulley 17 (C), fourth fixed pulley 16 (D), fourth moving pulley 17 (D), fifth After being hung on the fixed pulley 16 (E) and the second moving pulley 17 (E) in order, the end (other end) thereof is fixed to the upper fixed mounting portion 22.

  As shown in FIG. 9A, when the liquid level S of the insulating oil 3 in the liquid tank 2 is at the lowest level, the float 5 is at the position L10 in the figure, and the movable shaft 19 and thus the display needle 13 Comes to the lower end position (LOW). As shown in FIG. 9 (b), when the liquid level S of the insulating oil 3 in the liquid tank 2 rises 500 mm to the highest liquid level, the float 5 moves to the position of H10 in the figure. However, since the moving amount of the movable pulley 17 is 1/10 of the moving amount of the string holding member 7, the movable shaft 19 and thus the display needle 13 are lifted by 50 mm and come to the upper end position (HIGH). In the configuration of FIG. 9, the relationship between the movement range d of the display needle 13 with respect to the scale plate 12 and the fluctuation width D of the liquid surface S is 1:10.

  As described above, in the needle drive mechanism 14 according to the present embodiment, the moving pulley 17 (the movable shaft 19 (the movable shaft 19) with respect to the fluctuation of the length of the string member 7 as the string member 7 is hung on many fixed pulleys 16 and moving pulleys 17. The amount of vertical movement of Therefore, as the fluctuation width D of the liquid surface S (the dimension in the vertical direction from the lowest liquid level to the highest liquid level) increases, the liquid surface is increased by increasing the number of the string members 7 applied to the fixed pulley 16 and the moving pulley 17. With regard to the liquid tank 2 in which the size of the fluctuation range D of S is different, it is possible to display the fluctuation of the liquid level S even if the display 6 (the scale plate 12 and the display needle 13) is common.

  According to the liquid level display device 4 and the oil-filled insulation transformer 1 of the present embodiment described above, the following excellent effects can be obtained. That is, in the display 6 for displaying the height position of the station surface S of the insulating oil 3 in the liquid tank 2, the needle drive mechanism 14 is configured to include the fixed pulley 16 and the moving pulley 17, and in the case 10 It was set as the structure converted into the up-and-down motion (height position) of the moving pulley 17 (movable shaft 19) of the fluctuation | variation of the length of the string member 7 introduced. As a result, the vertical movement of the movable pulley 17 can be transmitted to the display needle 13 to display the height position of the liquid surface S, and the needle drive mechanism 14 is relatively provided with the fixed pulley 16 and the movable pulley 17. It can be done with a simple configuration.

  Therefore, according to the liquid level display device 4 of the present embodiment, the liquid level S in the liquid tank 2 can be easily confirmed, and a relatively simple configuration can be achieved. Further, according to the oil filled insulation transformer 1 of the present embodiment, the liquid level display device 4 can easily check the liquid level S in the liquid tank 2, and a portion related to the liquid level display device 4 Can be made relatively easy.

  In the liquid level display device 4 of the present embodiment, when the liquid level S in the liquid tank 2 is below the needle drive mechanism 14, the moving pulley 17 (movable shaft 19) is located below and the liquid level S is The string member 7 is hooked on the fixed pulley 16 and the moving pulley 17 so that the moving pulley 17 (movable shaft 19) is located on the top. As a result, it is possible to easily notify the operator performing the confirmation of the height position of the liquid surface S and the fluctuation thereof without a sense of discomfort, and the configuration therefor can be simplified.

  In the present embodiment, in particular, the needle drive mechanism 14 includes a plurality of constant pulleys 16 and a plurality of moving pulleys 17 connected by a movable shaft 19, and the fluctuation width D of the liquid surface S in the liquid tank 2 Accordingly, the number of the string members 7 to be hung on the fixed pulley 16 and the moving pulley 17 (the number of folds of the string members 7) is set. As a result, the display 6 is adjusted by adjusting the number of the string members 7 to be applied to the fixed pulley 16 and the moving pulley 17 with respect to the plurality of types of liquid tanks 2 in which the fluctuation width D in the upper and lower sides of the liquid surface S is different. It is possible to share

  Specifically, the number of the string member 7 to be hung on the fixed pulley 16 and the moving pulley 17 (the number of folds of the string member 7) is the movement range d of the display needle 13 with respect to the scale plate 12 and the liquid level in the liquid tank 2 The relationship between S and the fluctuation range D is set to be 1: N (N is a natural number). Thereby, when the maximum movement range dmax of the display needle 13 (the upper and lower size of the scale plate 12) is, for example, 50 mm, the number of the string members 7 applied to the fixed pulley 16 and the moving pulley 17 is changed. The fluctuation width D of the surface S can be made to correspond to that N times, that is, 50 mm, 100 mm, 150 mm, 200 mm,... 500 mm. As a result, it becomes possible to cope with a plurality of types of oil-filled insulation transformers 1 having different sizes (standards).

  More specifically, in the present embodiment, the fixed attachment 22 and the movable attachment 23 for attaching the end of the string member 7 are provided, and when the value of N is an odd number, the end of the string member 7 is Is attached to one of the movable fixed portions 23 of the moving pulley 17, and when the value of N is an even number, the end of the string member 7 is attached to one of the fixed attachment portions 22. As a result, the target needle drive mechanism 14 can be configured with a relatively simple configuration, and in particular, in the present embodiment, the plurality of moving pulleys 17 (movable shafts 19) are biased downward. The mainspring spring 21 is adopted as a biasing means. Thereby, compared with the case where a coil spring etc. are used, the fluctuation of the spring force accompanying the fluctuation of the height position of the moving pulley 17 can be made smaller, and it is always stable even if the height position of the moving pulley 17 fluctuates. It is possible to obtain a biasing force.

  In addition, although illustration is abbreviate | omitted, it is also possible to comprise as follows as another embodiment. That is, in the display 6, a lower end position detection switch may be provided in the case 10 to detect that the moving pulley 17 (movable shaft 19) is lowered to the lower end position. According to this, when a leak or the like of the insulating oil 3 from the liquid tank 2 occurs, an alarm can be issued based on the detection of the lower end position detection switch, and the transformer 1 can be made to stop in an emergency. It is possible to improve the quality.

  In the case 10, an upper end position detection switch may be provided to detect that the moving pulley 17 (movable shaft 19) has risen to the upper end position. According to this, for example, when the insulating oil 3 is injected into the liquid tank 2, the operator can be notified based on the detection of the upper end position detection switch, or the injection can be automatically stopped, and the workability is improved. Can be improved.

  Further, in the above-described embodiment, the insulating oil made of mineral oil is taken as an example of the cooling liquid, but any insulating oil other than mineral oil, liquid silicone, or a cooling liquid such as water may be used. A radiator for cooling the coolant may be added to the liquid tank to be provided, or the liquid tank may be provided with a consorbeta. Not only the mainspring spring 21 but also other springs such as a coil spring or weights may be employed as the biasing means. The fixed mounting portion 22 may be provided on the fixed pulley 16. The liquid-cooled electrical device is not limited to the oil-filled insulation transformer, but can be applied to all types of liquid-cooled electrical devices in which cooling and insulation of the device body are intended by a coolant such as a reactor.

  In addition, numerical values such as the number of fixed pulleys 16 and moving pulleys 17 provided, fluctuation width D of liquid surface S, movement range d (maximum movement range dmax) and the like are only an example and can be appropriately changed. is there. The embodiments described above are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, substitutions, and modifications can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and the gist of the invention, and are included in the invention described in the claims and the equivalent scope thereof.

  In the drawings, 1 is an oil filled insulation transformer (liquid cooled electrical device), 2 is a liquid tank, 3 is an insulating oil (liquid), 4 is a liquid level display device, 5 is a float (moving member), and 6 is a display 7, 7 is a string member, 10 is a case, 12 is a scale plate, 13 is a display needle, 14 is a needle drive mechanism, 16 is a fixed pulley, 17 is a moving pulley, 19 is a movable shaft (shaft), 21 is a mainspring spring (Biasing means), 22 is a fixed mounting portion, 23 is a movable mounting portion, and S is a liquid level.

Claims (9)

A moving member that is disposed in a liquid tank in which liquid is stored, and moves in the vertical direction in conjunction with fluctuations in the liquid surface of the liquid;
An indicator for displaying the level position of the liquid level of the liquid;
And a string member having one end connected to the moving member,
The display includes a case into which the other end of the string member is introduced, a scale plate and a display needle provided on a front surface of the case, and a needle drive provided in the case for operating the display needle Equipped with a mechanism,
The needle drive mechanism includes, in the case, a fixed pulley and a moving pulley provided movably in a predetermined range in the vertical direction with respect to the fixed pulley, and the vertical movement of which is transmitted to the display needle. The other end side part of the said string member introduce | transduced in the said case is comprised by being alternately hooked while being turned up and down by the said fixed pulley and a moving pulley.   In the needle drive mechanism, the moving pulley is positioned below when the liquid level in the liquid tank is below, and the moving pulley is positioned above when the liquid level is above, The liquid level display device according to claim 1, wherein the string member is hooked to the fixed pulley and the moving pulley. In the needle drive mechanism, a plurality of the fixed pulleys are juxtaposed in an upper portion in the case, and a plurality of the moving pulleys are juxtaposed under the constant pulley.
The shaft portions of the plurality of moving pulleys are connected to parallelly move the moving pulleys in the vertical direction, and a movable shaft is provided, the vertical movement of which is transmitted to the display needle,
The liquid level display device according to claim 1 or 2, wherein the number of the string members to be hung on the fixed pulley and the moving pulley is set in accordance with a fluctuation width D of the liquid level in the liquid tank.   The number of the string members to be hung on the fixed pulley and the moving pulley is such that the relationship between the movement range d of the display needle with respect to the scale plate and the fluctuation width D of the liquid level in the liquid tank is 1: N (N 4. The liquid level display device according to claim 3, wherein is a natural number.   When the value of N is an odd number, the end of the string member is attached to one of the moving pulleys, and when the value of N is an even number, the end of the string member is 5. The liquid level display device according to claim 4, wherein the liquid level display device is fixedly attached to a mounting portion above the upper end position of the movable shaft in the case.   The liquid level display device according to any one of claims 1 to 5, further comprising biasing means for biasing the plurality of moving pulleys downward, wherein the biasing means comprises a mainspring spring.   The liquid level display device according to any one of claims 1 to 6, further comprising: a lower end position detection switch that detects that the moving pulley is lowered to the lower end position.   The liquid level display device according to any one of claims 1 to 7, further comprising an upper end position detection switch that detects that the moving pulley has risen to the upper end position. A liquid-cooled electrical apparatus in which an apparatus body is accommodated in a liquid tank and a liquid for insulation and cooling of the apparatus body is accommodated,
A liquid-cooled electrical device comprising the liquid level display device according to any one of claims 1 to 8.

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