JP6993884B2 - Deceleration mechanism and liquid level display device - Google Patents

Description

Embodiments of the present invention relate to a deceleration mechanism and a liquid level display device.

For example, an oil-filled transformer is known to be configured by storing a transformer main body together with a cooling liquid such as insulating oil or liquid silicone in a storage container (liquid tank). Such an oil-filled transformer needs to be able to confirm the residual amount of the coolant from the outside of the liquid tank that stores the coolant at the time of installation (at the time of initial injection) or maintenance. Therefore, the dial oil level gauge described in Patent Document 1 is known as an oil level gauge that can confirm the height level of the oil level from the outside. This dial oil level gauge rotates a float that moves up and down (moves in an arc shape) according to the oil level by attaching the base end side of the L-shaped shaft and rotating the other end side of the shaft to rotate the indicator needle. It is configured to display the oil level.

Jitsukaisho 63-19225 Gazette

Various types (sizes) of oil-filled transformers as described above are provided, but if the size is large and the fluctuation range of the oil level is large, the above-mentioned dial oil level gauge will float. The range of movement of the is large, and it becomes large and large as a whole. Therefore, the liquid level is configured so that the float is simply moved up and down, and a string member such as a rope is attached to the float to convert the movement of the string member accompanying the vertical movement of the float into the rotational movement of the needle. I can think of a display device. In this case, it is desired that the mechanism for converting the movement of the string member into the rotational movement of the needle, that is, the deceleration mechanism, can be made compact with a relatively simple configuration.

As mentioned above, there are various standards for this type of oil-filled transformer, and the amount of coolant that can be accommodated and the displacement width above and below the liquid level differ greatly depending on the size of the liquid tank. Come on. For example, in the small one, the liquid level moves up and down with a width of about 50 mm, and in the large one, the liquid level moves up and down with a width of 500 mm. Therefore, it is possible to provide a liquid level display device that can be shared with respect to a plurality of types of liquid-cooled electric devices having different displacement widths above and below the liquid level, that is, it is possible to cope with various reduction ratios. It would be very useful if a reduction gear could be provided.

Therefore, we provide a deceleration mechanism capable of responding to various reduction ratios while being able to be compact with a relatively simple configuration, and a liquid level display device provided with the deceleration mechanism.

The deceleration mechanism according to the embodiment includes a rotation shaft rotatably supported by the base, a pulley for wire guides arranged coaxially around the rotation shaft, and the base located on the outer peripheral side of the drum. A group of fixed-side pulleys including a fixed support shaft extending parallel to the rotation shaft and fixedly provided, and a plurality of fixed pulleys rotatably inserted into the fixed support shaft so as to overlap each other in the axial direction, and the above-mentioned fixed-side pulley group. A movable support shaft connected via a connecting portion extending in the radial direction from the rotation axis, extending in parallel with the rotation axis on the outer peripheral side of the drum, and rotatably provided around the rotation axis, and axially to the movable support shaft. One end side is fixed to the fixed portion to the base or the movable side pulley group, and the other end side is arranged outside to the outside. It is provided with a wire member that is pulled out or fed from. Then, the wire member is alternately hung on the fixed pulley and the moving pulley while being guided by the outer periphery of the drum, and the movement of the wire member is decelerated by pulling out or feeding the wire member from the outside. It is configured to convert to the rotation of the rotation axis.

The liquid level display device according to the embodiment is a moving member that is arranged in a liquid tank in which a liquid is stored and moves in the vertical direction in conjunction with fluctuations in the liquid level of the liquid, and a height position of the liquid level of the liquid. It is equipped with a display that displays. The display has a scale plate in which scales corresponding to the height positions of the liquid surface are arranged in an arc shape, a display needle whose tip points to the scale of the scale plate by rotational movement, and claims 1 to 7. The deceleration mechanism according to any one of the items is provided. The moving member is connected to the other end side of the wire member of the deceleration mechanism, and the display needle is connected to the rotating shaft of the deceleration mechanism to be rotationally moved.

A partial vertical front view showing an embodiment and schematically showing the overall configuration of an oil-filled isolation transformer. Enlarged vertical sectional front view showing the configuration of the moving member portion arranged in the liquid tank of the oil-filled isolation transformer. The figure which shows the appearance composition of the display | display of a liquid level display device roughly. Perspective view schematically showing the configuration of the deceleration mechanism provided inside the liquid level display device. It shows the positional relationship between the rotation axis and the movable side pulley group in the deceleration mechanism, and is a plan view when (a) is 0 °, (b) is 45 °, and (c) is 270 °. Top view of the deceleration mechanism showing how to hang the wire member when the reduction ratio is 1:10. Left side view (a) and front view (b) of the speed reduction mechanism showing how to hang the wire member when the reduction ratio is 1:10. Top view of the deceleration mechanism showing how to hang the wire member when the reduction ratio is 1: 1. Left side view (a) and front view (b) of the speed reduction mechanism showing how to hang the wire member when the reduction ratio is 1: 1. Top view of the deceleration mechanism showing how to hang the wire member when the reduction ratio is 1: 2. Left side view (a) and front view (b) of the speed reduction mechanism showing how to hang the wire member when the reduction ratio is 1: 2. Top view of the deceleration mechanism showing how to hang the wire member when the reduction ratio is 1: 3. Left side view (a) and front view (b) of the speed reduction mechanism showing how to hang the wire member when the reduction ratio is 1: 3. Left side view (a) and front view (b) of the speed reduction mechanism showing how to hang the wire member when the reduction ratio is 1: 4.

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

The liquid tank 2 is filled with insulating oil 3 as a cooling liquid (liquid) close to the ceiling so that the entire transformer body is immersed. As the insulating oil 3, for example, mineral oil is adopted. In FIGS. 1 and 2, the height position of the liquid level, which is the oil level of the insulating oil 3, is indicated by reference numeral S. As a result, the outer peripheral portion of the coil of the transformer main body, the cable portion for connection, etc. are regarded as charging parts having a high voltage, but the entire charging parts are immersed in the insulating oil 3 for insulation and cooling. Has been done.

At this time, during the operation of the transformer, the liquid level S of the insulating oil 3 fluctuates up and down with expansion and contraction due to temperature. The liquid level S of the insulating oil 3 in the liquid tank 2 is at least the minimum liquid level (L) required for insulation and cooling of the transformer main body, and is slightly between the insulating oil 3 and the ceiling portion of the liquid tank 2. It is stored so as to be below the maximum liquid level (H) that secures a gap. Let D be the fluctuation range of the liquid level S of the insulating oil 3 in such a liquid tank 2. This fluctuation width D differs depending on the standard of the oil-filled transformer 1 and the size of the liquid tank 2, for example, the fluctuation width D is about 50 mm for a small one, and the fluctuation width D is about 50 mm for a large one. Some are about 500 mm.

In the oil-filled isolation transformer 1 of the present embodiment, the liquid level display for the operator to know (visually recognize) the height position of the liquid level S of the insulating oil 3 in the liquid tank 2 from the outside. The device 4 is provided. As shown in FIGS. 1 to 3, the liquid level display device 4 according to the present embodiment has a float 5 as a moving member that moves in the vertical direction in conjunction with fluctuations in the liquid level S of the insulating oil 3, and insulation. A display 6 for displaying the height position of the liquid level S of the oil 3 and a wire member 7 having one end connected to the float 5 are provided.

Among them, as shown in FIGS. 1 and 2, the float 5 has a flat cylindrical shape formed of, for example, a hollow shape from plastic, 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 so that it moves up and down in conjunction with. As shown in FIG. 2, the wire member 7 is made of, for example, a metal wire, and one end thereof is connected to the central portion of the upper surface of the float 5. The wire member 7 is flexibly bent and is led out to the outside through a circular opening 8 formed on the upper surface of the liquid tank 2.

Further, between the outer peripheral portion of the upper surface of the float 5 and the circular opening 8, a cylindrical bellows-shaped telescopic member 9 made of rubber or soft plastic connects them vertically and expands and contracts in the vertical direction. It is configured to be possible. As a result, the wire member 7 is led out to the outside through the inside of the expansion / contraction member 9, and the vapor of the insulating oil 3 or the like is prevented from entering the inside of the expansion / contraction member 9. As shown in FIG. 1, the display 6 is mounted at a height position on the outer surface of the liquid tank 2, in this case, the front surface, which is easy for an operator to see. At this time, a connecting tube 11 is provided so as to connect the circular opening 8 and the case 10 of the display 6, and the wire member 7 led out from the circular opening 8 passes through the connecting tube 11. It is introduced in the case 10 of the display device 6.

Here, the display 6 will be described in detail. As partially shown in FIGS. 1, 3 and the like, the display 6 includes a case 10 in which the other end side of the wire member 7 is introduced, and a scale plate 12 and a display needle 13 provided on the front surface of the case 10. And a deceleration mechanism 14 (see FIG. 4 and the like) as a needle drive mechanism for operating the display needle 13 provided in the case 10. The case 10 is formed in a cylindrical shape, and a transparent plate such as glass is arranged on the front surface thereof so that the scale plate 12 and the display needle 13 can be visually recognized.

As shown in FIG. 3, the scale plate 12 has a circular shape, and scales indicating the height level of the liquid level S are provided in an arc shape at a portion closer to the outer peripheral side thereof. In this case, the scale plate 12 is located in the lower left part of the figure and has a scale of "LOW (0)" indicating the lowest liquid level, and is located in the lower right part of the figure to indicate the highest liquid level. The scale of "HIGH (100)" is recorded. Then, with "LOW (lowest liquid level)" as 0% and "HIGH (highest liquid level)" as 100%, the ratio of the height of the liquid level S so that the space between them increases in order in the clockwise direction. The scales of "10" to "90", which are numbers indicating the above, are evenly written.

The tip of the display needle 13 has a needle shape indicating one of the scales of the scale plate 12, and the base end portion thereof is attached to the tip of the shaft portion 15 penetrating the center of the scale plate 12 and extends in the radial direction. ing. In this case, the display needle 13 (shaft portion 15) is configured to be rotatable from the scale of "LOW (0)" to the scale of "HIGH (100)", for example, in an angle of 270 degrees. Here, the display needle 13 sets the position of the shaft portion 15 (rotary axis described later) indicating the scale of “LOW (0)” to 0 °, and the display needle 13 indicates the axis indicating the scale of “HIGH (100)”. The position of the portion 15 (rotating axis) is set to 270 °.

The deceleration mechanism 14 according to the present embodiment will be described with reference to FIGS. 4 to 14. In FIGS. 4 to 14, the internal configuration of the deceleration mechanism 14, that is, the display 6 is shown with the surface side of the display 6, that is, the side with the scale plate 12 facing upward. In the following description of the deceleration mechanism 14, when referring to the vertical direction, the vertical direction is used as a reference. Therefore, FIGS. 5, 6 and the like are plan views viewed from above.

As shown in FIGS. 4 to 14, the deceleration mechanism 14 includes a base 16, a rotary shaft 17, a drum 18 for a wire guide, a fixed side pulley group 19, a movable side pulley group 20, and a spring 21 as an urging means. (See Fig. 7 etc.). At the same time, the other end side portion of the wire member 7 introduced into the case 10 of the display 6 is connected to the deceleration mechanism 14. The base 16 has a disk shape (thin cylinder shape) and is fixedly provided in the case 10 of the display device 6. The rotating shaft 17 is rotatably supported so as to extend upward in the figure from the central portion of the base 16. The shaft portion 15 is provided at the upper end of the rotating shaft 17 so as to project upward, and the display needle 13 is attached to the shaft portion 15.

As shown in FIG. 5, the drum 18 has a cylindrical shape having a central hole through which the rotation shaft 17 is inserted, and is coaxially provided on the outer peripheral portion of the rotation shaft 17. In this case, as shown in FIG. 7 and the like, the drum 18 is fixedly provided to the base 16 in a state where a space through which the connecting portion 22 described later can pass is secured on the lower portion, that is, on the base 16. There is. The outer diameter of the drum 18 is slightly larger (about twice) than the outer diameter of the moving pulley and the fixed pulley, which will be described later.

Further, in the present embodiment, as shown in FIGS. 6 to 14, a plurality of guide grooves 23 for guiding the wire member 7 extend all around the outer peripheral surface of the drum 18 in the circumferential direction. It is formed. At this time, the guide grooves 23 are formed so as to be arranged at equal intervals in the axial direction, and the number of guide grooves 23 is double the number (5) of the number of moving pulleys (and fixed pulleys) described later, in this case, 10 are formed. There is. Further, in the present embodiment, at least the inner surface of the guide groove 23 on the outer peripheral surface of the drum 18 is subjected to surface treatment such as Teflon processing to reduce the friction coefficient, and the wire member 7 is configured to be slippery. ..

As shown in FIGS. 4 to 14, the fixed side pulley group 19 is provided at a position on the front side of the drum 18 on the base 16, and includes a fixed support shaft 24 and a plurality of fixed pulleys 25. It is composed. The fixed support shaft 24 extends upward from the base 16, that is, extends in parallel with the rotation shaft 17 and is fixedly provided. A plurality of, for example, five fixed pulleys 25 are fitted into the fixed support shaft 24 so as to overlap in the axial direction, and are rotatably attached to the fixed support shaft 24 via bearings (not shown). ..

In this case, each fixed pulley 25 of the fixed side pulley group 19 is positioned slightly away from the outer peripheral surface of the drum 18 as shown in FIGS. 4 to 6 and the like. Further, as shown in FIG. 7 and the like, the fixed pulleys 25 adjacent to each other are slightly separated from each other, and one fixed pulley 25 is at the height of two guide grooves 13 of the drum 18. Arranged to be positioned. Further, as shown in FIGS. 6 and 7, the fixed support shaft 24 is located immediately below the fixed pulley 25 at the lowermost stage and is fixed for fixing (connecting) the end portion of the wire member 7. A side mounting portion 26 is provided.

The movable side pulley group 20 includes a movable support shaft 27 connected via a connecting portion 22 extending in the radial direction from the rotating shaft 17, and a plurality of movable pulleys 28 in this case. As shown in FIGS. 4, 5, 7, 7 (b) and the like, the connecting portion 22 has a rod shape, the base end portion is fixed to the lower portion of the rotating shaft 17, and the connecting portion 22 is radially on the base 16 (FIG. 6). Etc. to the left). The movable support shaft 27 is located on the left side of the drum 18 in FIGS. 4, 6 and the like, and is integrally provided so as to extend upward from the tip of the connecting portion 22, that is, parallel to the rotation shaft 17. As a result, the movable support shaft 27 swivels around the drum 18 integrally with the rotation of the rotating shaft 17.

A plurality of, for example, five moving pulleys 28 are fitted into the movable support shaft 27 so as to overlap each other in the axial direction, and are rotatably attached to the movable support shaft 27 via bearings (not shown). Has been done. In this case, each moving pulley 28 of the movable side pulley group 20 is positioned slightly away from the outer peripheral surface of the drum 18 as shown in FIGS. 4 to 6 and the like. Further, as also shown in FIG. 7, the moving pulleys 28 adjacent to each other are slightly separated from each other, and one moving pulley 28 is the height of two guide grooves 13 of the drum 18. It is arranged so that it is located at. At this time, the moving pulley 28 is arranged at a position slightly lower than the fixed pulley 25. Further, as shown in FIGS. 8 and 9, the movable pulley 28 located at the lowermost stage of the moving pulley 28 has a movable side mounting portion 29 for fixing (connecting) the end portion of the wire member 7. It is provided.

Here, (a), (b), and (c) of FIG. 5 show the positions of the movable side pulley group 20 at the 0 ° position, the 45 ° position, and the 270 ° position of the rotating shaft 17, respectively. There is. Here, as shown in FIG. 5A, the position where the movable side pulley group 20 is immediately to the left in the figure of the fixed side pulley group 19 is defined as the 0 ° position of the rotating shaft 17. .. The rotating shaft 17 and the movable side pulley group 20 rotate (turn) fully clockwise in the figure from there, and as shown in FIG. 5 (c), the movable side pulley group 20 is the fixed side pulley group. The position immediately to the right of the figure 19 is the position of the rotation axis 17 at 270 °. FIG. 5B shows the position of the rotating shaft 17 at 45 °, and FIGS. 4 and 6 to 14 show the configuration of the deceleration mechanism 14 with the rotating shaft 17 at the 45 ° position. There is.

Although not shown in detail, the rotary shaft 17 and thus the movable side pulley group 20 are urged in the 0 ° direction by the urging means, that is, in the counterclockwise direction in FIG. 5 and the like. Then, as shown in FIG. 7 and the like, the urging means is composed of the mainspring 21 arranged in the base 16. Incidentally, in the present embodiment, when the position of the rotating shaft 17 moves from 0 ° to 270 °, the moving distance d in the turning direction of the movable side pulley group 20 (strictly speaking, the movable side mounting portion 29) (FIG. 5). (See) is, for example, 50 mm.

Then, in the speed reduction mechanism 14, the other end side portion of the wire member 7 introduced into the case 10 is attached to the movable side mounting portion 29 or the fixed side mounting portion 26, and then the end portion is attached to the movable side mounting portion 29 or the fixed side mounting portion 26. While being guided by the outer periphery of the drum 18, the fixed pulley 25 of the fixed side pulley group 19 and the moving pulley 28 of the movable side pulley group 20 are set so as to be alternately folded and hung. With this, the movement of the wire member 7 is decelerated by pulling out or feeding in from the outside of the wire member 7, and the rotation of the rotation shaft 17 is converted into the rotation of the display needle 13.

That is, for example, as the wire member 7 is pulled out from the outside, the movable side pulley group 20 (movable support shaft 27) approaches the fixed side pulley group 19 (fixed support shaft 24) in the clockwise direction, that is, the separation angle. Turn and move in the direction of reducing. Further, for example, as the wire member 7 is fed from the outside, the movable side pulley group 20 swivels in a direction away from the fixed side pulley group 19 in a counterclockwise direction, that is, in a direction in which the separation angle is increased. At this time, the variation in length due to the drawing or feeding of the wire member 7 from the outside can be converted into the turning of the movable side pulley group 20 and the rotation of the rotating shaft 17.

In the deceleration mechanism 14, the larger the variation in the length of the wire member 7, the larger the turning amount (turning angle) of the movable side pulley group 20 and the rotation amount (rotating angle) of the rotating shaft 17. Although not shown in detail, in the present embodiment, when the liquid level S of the insulating oil 3 in the liquid tank 2 rises, the wire member 7 is pulled out from the deceleration mechanism 14 to the outside, and the liquid level S falls. , The wire member 7 is drawn in from the outside, that is, is drawn into the deceleration mechanism 14.

At this time, in the wire member 7, for example, when the liquid level S of the insulating oil 3 in the liquid tank 2 is the lowest liquid level (L), the rotating shaft 17 is at the 0 ° position and the display needle 13 is set to “LOW”. When the scale of "(0)" is indicated, or when the liquid level S of the insulating oil 3 in the liquid tank 2 is the maximum liquid level (H), the rotating shaft 17 is at the position of 270 ° and the display needle 13 is set to ". It is set without slack so as to indicate the scale of "HIGH (100)". At the same time, the number of wire members 7 to be hung on the moving pulley 28 and the fixed pulley 25 and the wire member so as to have a reduction ratio of the speed reduction mechanism 14 according to the fluctuation width D of the liquid level S in the liquid tank 2. The position of the mounting portion for fixing the tip of No. 7, that is, whether to use the fixed side mounting portion 26 or the movable side mounting portion 29 is set.

Here, the reduction ratio in the deceleration mechanism 14 is the amount of movement of the wire member 7, that is, the amount of fluctuation in length with respect to the amount of rotation (angle) of the rotating shaft 17, that is, the amount of swirling movement of the movable support shaft 27 (this is set to 1). It can be defined as the ratio of (N), that is, the value of 1: N. In this case, N is a natural number. As the number of wire members 7 hung on the moving pulley 28 and the fixed pulley 25 increases, the turning movement amount of the movable side pulley group 20 becomes smaller than the movement amount (length variation amount) of the wire member 7. be.

In this case, the value of N coincides with the number of turns of the wire member 7 in the moving pulley 28 and the constant pulley 25. For example, by increasing the number of wire members 7 that can be hung on the moving pulley 28 and the constant pulley 25 to increase the reduction ratio, the amount of movement of the wire member 7 can be increased even with a small force, thereby allowing the wire member 7 to move on the rotation shaft 17 side. A large force (torque) can be generated. In the liquid level display device 4, the value of the reduction ratio, that is, N in the speed reduction mechanism 14, is d: D according to the relationship between the movement range d of the movable side pulley group 20 and the fluctuation range D of the liquid level S. = 1: It is set to be N. This makes it possible to variously fluctuate (set) the rotation amount (rotation angle) of the rotation shaft 17 with respect to the movement amount of the wire member 7, that is, the reduction ratio.

Further, the reduction ratio can also be changed depending on the fixed position on one end side of the wire member 7. Specifically, for example, when the movement amount of the movable side pulley group 20 is 1, the movement amount N of the wire member 7 with respect to the movement amount N may be fixed to the movable side mounting portion 29 if it is desired to be an odd number. If it is desired to be, it may be fixed to the fixed side mounting portion 26. It should be noted that the length of the entire wire member 7, that is, the portion introduced into the case 10 also varies depending on the magnitude of the reduction ratio (value of N), and it is needless to say that the length is appropriate according to the reduction ratio.

As described in the following description of the operation, in the present embodiment, the moving range d is, for example, 50 mm. Therefore, when the fluctuation width D of the liquid level S in the liquid tank 2 is 50 mm (or less), The value of N of the reduction ratio is set to 1. When the fluctuation width D is 100 mm (or 50 to 100 mm), the value of N of the reduction ratio is 2. When the fluctuation width D is 150 mm (or 100 to 150 mm), the value of N of the reduction ratio is set to 3. Although the middle part is omitted, similarly, when the fluctuation width D is 500 mm (or 450 to 500 mm), the value of N of the reduction ratio is set to 10.

Next, the operations of the deceleration mechanism 14 and the liquid level display device 4 having the above configuration will be described mainly with reference to FIGS. 6 to 14. 6 to 14 illustrate how the wire member 7 is hung on the moving pulley 28 and the fixed pulley 25 in the speed reduction mechanism 14. 6 and 7 have an N value of 10, FIGS. 8 and 9 have an N value of 1, FIGS. 10 and 11 have an N value of 2, and FIGS. 12 and 13 have an N value. When the value is 3, FIG. 14 illustrates the case where the value of N is 4. As described above, FIGS. 6 to 14 show the rotating shaft 17 at a position of 45 °.

As shown in FIGS. 6 and 7, for example, when the fluctuation width D (difference between the minimum liquid level L and the maximum liquid level H) of the liquid level S in the liquid tank 2 is 500 mm, the reduction ratio of the reduction mechanism 14 is 1. : 10, that is, N = 10 is set. That is, since the end portion of the wire member 7 has an even number of N, it is fixed to the fixed side mounting portion 26 of the fixed side pulley group 19. Next, the wire member 7 extends in the lowermost guide groove 23 on the outer circumference of the drum 18 while being guided in the direction of arrow A (see FIG. 6), and extends to the lowermost moving pulley 28 of the movable side pulley group 20 by the arrow B. Hang in the direction (see Figure 6). The wire member 7 folded back by the lowermost moving pulley 28 is guided in the second guide groove 23 from the bottom of the drum 18 in the direction opposite to the arrow A, and reaches the fixed side pulley group 19 portion.

Then, the wire member 7 is hung on the fixed pulley 25 at the bottom of the fixed side pulley group 19 in the direction of arrow C (see FIG. 6) and folded back in the direction of arrow C'. After that, the wire member 7 is guided in the direction of arrow A in the third guide groove 23 from the bottom of the drum 18, and is hung on the second moving pulley 28 from the bottom of the movable side pulley group 20 in the direction of arrow B. Be done. The wire member 7 folded back by the moving pulley 28 is guided in the guide groove 23 of the drum 18 in the direction opposite to the arrow A, reaches the fixed side pulley group 19 portion, and goes up one step at a time to the above-mentioned moving pulley. The turn-back between 28 and the fixed pulley 25 is repeated.

In this way, the wire member 7 folded back from the uppermost (fifth) moving pulley 28 guides the inside of the uppermost (10th from the bottom) guide groove 23 of the drum 18 in the direction opposite to the arrow A. Then, the pulley group 19 on the fixed side is reached, and the fixed pulley 25 on the uppermost stage is hung in the direction of arrow C and derived. In this case, when the liquid level S of the insulating oil 3 in the liquid tank 2 is at the lowest liquid level (L), the rotating shaft 17 is at the position of 0 °, and the display needle 13 is “LOW (0)”. The wire member 7 is set (connected to the float 5) without slack so as to come to a position indicating the scale.

As a result, the number of turns of the wire member 7 becomes 10, and the reduction ratio of the reduction mechanism 14 becomes 1:10 (N = 10). Therefore, the wire is caused by the fluctuation of the liquid level S, that is, the vertical movement of the float 5. The amount of movement of the movable side pulley group 20 in the turning direction is 1/10 of the amount of movement of the member 7. Now, for example, when the liquid level S at the lowest liquid level L rises to the highest liquid level H by, for example, 500 mm, the wire member 7 is pulled out from the deceleration mechanism 14, and the amount of movement (length) of the wire member 7 is increased. Fluctuation) is also 500 mm. As a result, the position of the rotating shaft 17 rotates from 0 ° (see FIG. 5 (a)) to 270 ° (see FIG. 5 (c)), and the display needle 13 moves from the “LOW (0)” scale. Move to the "HIGH (100)" scale. Since the rotation shaft 17 is urged in the direction of 0 ° (counterclockwise direction) by the spring 21, the wire member 7 is outside when the liquid level S (float 5) is lowered. The rotation shaft 17 and thus the display needle 13 move in the direction in which the scale becomes smaller so as to be carried in from.

As described above, in the liquid level display device 4, the portion introduced into the case 10 (deceleration mechanism 14) of the wire member 7 according to the position of the float 5 floating on the liquid level S of the insulating oil 3. The length fluctuates, and the deceleration mechanism 14 converts the fluctuation in the length of the wire member 7 into the turning (rotation) position of the movable side pulley group 20 and thus the rotating shaft 17, and transmits the fluctuation to the display needle 13 to transmit the liquid level. The height position of S can be displayed on the display 6. The operator can know the position of the liquid level S of the insulating oil 3 in the liquid tank 2 by looking at the position of the display needle 13 of the display 6, and whether or not the required amount of the insulating oil 3 is stored. Can be easily confirmed.

As shown in FIGS. 8 and 9, for example, when the fluctuation width D (difference between the lowest liquid level L and the highest liquid level H) of the liquid level S in the liquid tank 2 is 50 mm, the reduction ratio of the reduction mechanism 14 is set. It is set so that N = 1. At this time, since N is an odd number, the end portion of the wire member 7 is fixed to the movable side mounting portion 29 provided on the lowermost moving pulley 28 of the movable side pulley group 19. Next, the wire member 7 extends in the second guide groove 23 from the bottom of the outer circumference of the drum 18 while being guided in the direction opposite to the arrow A, and extends in the direction of the arrow C to the lowermost fixed pulley 25 of the fixed side pulley group 19. It is derived by multiplying by. Also in this case, when the liquid level S of the insulating oil 3 in the liquid tank 2 is at the lowest liquid level (L), the rotating shaft 17 is at the position of 0 °, and the display needle 13 is “LOW (0)”. The wire member 7 is set (connected to the float 5) without slack so as to come to a position indicating the scale of.

As a result, the reduction ratio of the reduction mechanism 14 is set to 1: 1 (N = 1), and the movable side pulley with respect to the movement amount of the wire member 7 due to the fluctuation of the liquid level S, that is, the vertical movement of the float 5. The amount of movement of the group 20 in the turning direction becomes equal. Now, for example, when the liquid level S at the lowest liquid level L rises to the highest liquid level H by, for example, 50 mm, the wire member 7 is pulled out from the deceleration mechanism 14, and the amount of movement (length) of the wire member 7 is increased. Fluctuation) is also 50 mm. As a result, the position of the rotation shaft 17 rotates from 0 ° to 270 °, and the display needle 13 moves from the “LOW (0)” scale to the “HIGH (100)” scale. When the liquid level S (float 5) is lowered, the wire member 7 is also fed from the outside, and the rotation shaft 17 and the display needle 13 move in the direction in which the scale becomes smaller.

As shown in FIGS. 10 and 11, for example, when the fluctuation width D of the liquid level S in the liquid tank 2 is 100 mm, the reduction ratio of the reduction mechanism 14 is 1: 2 (N = 2), that is, the wire member 7. The number of wraps is set to 2. At this time, since N is an even number, the end portion of the wire member 7 is fixed to the fixed side mounting portion 26. Next, the wire member 7 extends in the lowermost guide groove 23 on the outer circumference of the drum 18 while being guided in the direction of arrow A, and is hung on the lowermost moving pulley 28 of the movable side pulley group 20 in the direction of arrow B.

The wire member 7 folded back by the lowermost moving pulley 28 extends in the second guide groove 23 from the bottom of the drum 18 while being guided in the direction opposite to the arrow A, and extends in the lowermost stage of the fixed side pulley group 19. It is derived by being hung on the fixed pulley 25 in the direction of arrow C. Also in this case, when the liquid level S of the insulating oil 3 in the liquid tank 2 is at the lowest liquid level (L), the rotating shaft 17 is at the position of 0 °, and the display needle 13 is “LOW (0)”. The wire member 7 is set (connected to the float 5) without slack so as to come to a position indicating the scale of.

As a result, the reduction ratio of the reduction mechanism 14 is set to 1: 2 (N = 2), and the movable side pulley with respect to the movement amount of the wire member 7 due to the fluctuation of the liquid level S, that is, the vertical movement of the float 5. The amount of movement of the group 20 in the turning direction is halved. Therefore, for example, when the liquid level S at the lowest liquid level L rises by 100 mm to the highest liquid level H, the amount of movement (variation in length) from which the wire member 7 is pulled out becomes 100 mm, so that the rotating shaft 17 is moved. Rotating from 0 ° to 270 °, the display hand 13 moves from the “LOW (0)” scale to the “HIGH (100)” scale. When the liquid level S is lowered, the display needle 13 moves in the direction in which the scale becomes smaller in the same manner as described above.

As shown in FIGS. 12 and 13, for example, when the fluctuation width D of the liquid level S in the liquid tank 2 is 150 mm, the reduction ratio of the reduction mechanism 14 is N = 3, that is, the number of turns of the wire member 7 is It is set to be 3. At this time, since N is an odd number, the end portion of the wire member 7 is fixed to the movable side mounting portion 29 provided on the lowermost moving pulley 28 of the movable side pulley group 19. Next, the wire member 7 extends in the second guide groove 23 from the bottom of the outer circumference of the drum 18 while being guided in the direction opposite to the arrow A, and extends in the direction of the arrow C to the lowermost fixed pulley 25 of the fixed side pulley group 19. And fold back in the direction of arrow C'.

After that, the wire member 7 is guided in the direction of arrow A in the third guide groove 23 from the bottom of the drum 18, and is hung on the second moving pulley 28 from the bottom of the movable side pulley group 20 in the direction of arrow B. Be done. The wire member 7 folded back by the moving pulley 28 is guided in the fourth guide groove 23 from the bottom of the drum 18 in the direction opposite to the arrow A, reaches the fixed side pulley group 19 part, and is the second from the bottom. It is derived by being hung on the fixed pulley 25 in the direction of arrow C. Also in this case, when the liquid level S of the insulating oil 3 in the liquid tank 2 is at the lowest liquid level (L), the rotating shaft 17 is at the position of 0 °, and the display needle 13 is “LOW (0)”. The wire member 7 is set (connected to the float 5) without slack so as to come to a position indicating the scale of.

As a result, the reduction ratio of the reduction mechanism 14 is set to 1: 3 (N = 3), and the movable side pulley with respect to the movement amount of the wire member 7 due to the fluctuation of the liquid level S, that is, the vertical movement of the float 5. The amount of movement of the group 20 in the turning direction is reduced to 1/3. Therefore, for example, when the liquid level S at the lowest liquid level L rises by 150 mm to the highest liquid level H, the amount of movement (variation in length) from which the wire member 7 is pulled out becomes 150 mm, so that the rotating shaft 17 is moved. Rotating from 0 ° to 270 °, the display hand 13 moves from the “LOW (0)” scale to the “HIGH (100)” scale. When the liquid level S is lowered, the display needle 13 moves in the direction in which the scale becomes smaller in the same manner as described above.

As shown in FIG. 14, for example, when the fluctuation width D of the liquid level S in the liquid tank 2 is 200 mm, the reduction ratio of the reduction mechanism 14 is 1: 4 (N = 4), that is, the number of turns of the wire member 7 is 4. Is set to be. Here, the plan view of the deceleration mechanism 14 is the same as that of FIG. 6, and is omitted here. At this time, since N is an even number, the end portion of the wire member 7 is fixed to the fixed side mounting portion 26. Next, the wire member 7 extends in the lowermost guide groove 23 on the outer circumference of the drum 18 while being guided in the direction of arrow A, and is hung on the lowermost moving pulley 28 of the movable side pulley group 20 in the direction of arrow B.

The wire member 7 folded back by the lowermost moving pulley 28 extends in the second guide groove 23 from the bottom of the drum 18 while being guided in the direction opposite to the arrow A, and extends in the lowermost stage of the fixed side pulley group 19. It is hung on the fixed pulley 25 in the direction of arrow C and turned back in the direction of arrow C'. After that, the wire member 7 is guided in the direction of arrow A in the third guide groove 23 from the bottom of the drum 18, and is hung on the second moving pulley 28 from the bottom of the movable side pulley group 20 in the direction of arrow B. Be done. Second from the bottom

The wire member 7 folded back by the moving pulley 28 is guided in the fourth guide groove 23 from the bottom of the drum 18 in the direction opposite to the arrow A, reaches the fixed side pulley group 19 part, and is the second from the bottom. It is derived by being hung on the fixed pulley 25 in the direction of arrow C. Also in this case, when the liquid level S of the insulating oil 3 in the liquid tank 2 is at the lowest liquid level (L), the rotating shaft 17 is at the position of 0 °, and the display needle 13 is “LOW (0)”. The wire member 7 is set (connected to the float 5) without slack so as to come to a position indicating the scale of.

As a result, the reduction ratio of the reduction mechanism 14 is set to 1: 4 (N = 4), and the movable side pulley with respect to the movement amount of the wire member 7 due to the fluctuation of the liquid level S, that is, the vertical movement of the float 5. The amount of movement of the group 20 in the turning direction is reduced to 1/4. Therefore, for example, when the liquid level S at the lowest liquid level L rises by 200 mm to the highest liquid level H, the amount of movement (variation in length) from which the wire member 7 is pulled out becomes 200 mm, so that the rotating shaft 17 is moved. Rotating from 0 ° to 270 °, the display hand 13 moves from the “LOW (0)” scale to the “HIGH (100)” scale. When the liquid level S is lowered, the display needle 13 moves in the direction in which the scale becomes smaller in the same manner as described above. Although the description regarding the case where the value of N is 5 to 9 is omitted, the wire member 7 can be set according to the case where the value of N is 1 to 4, 10 as described above.

As described above, in the liquid level display device 4 of the present embodiment, by providing the deceleration mechanism 14 having the above configuration, the length of the wire member 7 is so long that the wire member 7 can be hung on many moving pulleys 28 and constant pulleys 25. In response to the fluctuation, the amount of movement of the movable side pulley group 20 and thus the amount of rotation of the rotating shaft 17 are reduced. Therefore, as the fluctuation width D (vertical dimension from the lowest liquid level to the highest liquid level) of the liquid level S becomes larger, the number of wire members 7 to be hung on the moving pulley 28 and the fixed pulley 25 is increased, so that the liquid level is increased. With respect to the liquid tanks 2 having different sizes of the fluctuation width D of S, it is possible to display the fluctuation of the liquid level S even if the display 6 (scale plate 12 and the display needle 13) is shared.

According to the deceleration mechanism 14 of the present embodiment described above, the following actions and effects can be obtained. That is, the deceleration mechanism 14 of the present embodiment includes a rotating shaft 17, a drum 18, a fixed side pulley group 19, and a movable side pulley group 20 on the base 16, and the wire member 7 is a fixed pulley of the fixed side pulley group 19. 25 and the moving pulley 28 of the movable side pulley group 20 are alternately hung while being guided by the drum 18 on the way. Thereby, the variation in the length of the wire member 7 due to the withdrawal or feeding from the outside of the wire member 7 can be converted into the rotation around the rotation shaft 17 of the movable side pulley group 20, and eventually the rotation of the rotation shaft 17. ..

At this time, as the variation in the length of the wire member 7 becomes larger, the turning amount (turning angle) of the movable side pulley group 20 and the rotation amount (turning angle) of the rotating shaft 17 also becomes larger, but the wire member 7 is the moving pulley 28. As the number of pulleys hung on the fixed pulley 25 increases, the turning movement amount of the movable side pulley group 20 becomes smaller with respect to the moving amount (length variation amount) of the wire member 7. Utilizing this, it has become possible to variously change the rotation amount (rotation angle) of the rotation shaft 17 with respect to the movement amount of the wire member 7, that is, the reduction ratio. For example, by increasing the number of wire members 7 that can be hung on the moving pulley 28 and the fixed pulley 25 to increase the reduction ratio, the amount of movement of the wire member 7 can be increased even with a small force, thereby allowing the wire member 7 to move more on the rotation shaft 17 side. A large force (torque) can be generated.

Further, in the present embodiment, the fixed side pulley group 19 and the movable side pulley group 20 may be arranged along the circumferential direction on the outer peripheral side of the rotating shaft 17 (drum 18), so that a relatively simple configuration is sufficient. be able to. Moreover, the rotating shaft 17, the drum 18, the fixed side pulley group 19, and the movable side pulley group 20, which are components, can be compactly arranged with respect to the base 16. As a result, according to the deceleration mechanism 14 of the present embodiment, it is possible to obtain an excellent effect that it is possible to cope with various reduction ratios while being able to be made compact with a relatively simple configuration.

According to the liquid level display device 4 of the present embodiment, the speed reduction mechanism 14 is provided, and the fluctuation of the height of the liquid level S of the liquid in the liquid tank 2 is the length of the wire member 7 in the speed reduction mechanism 14. It is converted into a variation, and the variation in the length of the wire member 7 is configured to be converted into the turning angle of the movable side pulley group 20 and the rotation angle of the rotating shaft 17 by the deceleration mechanism 14. Therefore, by driving the display needle 13 by the rotation of the rotation shaft 17, it is possible to display the height position of the liquid level S.

In this case, since the deceleration mechanism 14 described above is provided, the liquid level display device 4 can be shared by a plurality of types of devices having different levels of the fluctuation amount D of the height of the liquid level S by changing the reduction ratio. Become. That is, by changing the number of the wire members 7 to be hung on the moving pulley 28 and the fixed pulley 25, the fluctuation width D of the liquid level S is N times (integer multiple) of the moving distance d, 50 mm, 100 mm, 150 mm, 200 mm, ... It has become possible to correspond to each oil-filled isolation transformer 1 of 500 mm. Further, as described above, since the deceleration mechanism 14 can be made compact with a relatively simple configuration, the entire liquid level display device 4 can also be made compact with a relatively simple configuration.

In particular, in the deceleration mechanism 14 of the present embodiment, in order to fix one end side of the wire member 7, the fixed side mounting portion 26 provided in the fixed side pulley group 19 and the movable side pulley group 19 are provided. The side mounting portion 29 is provided, and the fixed position is set according to the reduction ratio. This made it possible to share more various reduction ratios.

Further, the deceleration mechanism 14 of the present embodiment is provided with a rewinding mechanism for returning the rotating shaft 17 to the origin position (position at 0 °), and the rewinding mechanism is attached with the rotating shaft 17 facing the origin position. It was composed of a mainspring 21 as a means of urging. As a result, the wire member 7 and thus the rotating shaft 17 can be easily moved in both directions. Here, for example, when the urging means is composed of a coil spring, the spring force may vary depending on the position of the movable side pulley group 20, but by adopting the mainspring 21, the movable side pulley group 20 A stable spring force (urging force) can be obtained regardless of the position. The mainspring 21 can be arranged in a small space.

Further, in the deceleration mechanism 14 of the present embodiment, a plurality of guide grooves 23 extending in the circumferential direction for guiding the wire member 7 are provided on the outer periphery of the drum 18 according to the number of the fixed pulley 25 and the moving pulley 28. The number of books, that is, double the number (10 in this case) was formed by the round trip. Further, the positional relationship is such that two guide grooves 23 are lined up in the axial direction with respect to the axial distance between the fixed pulley 25 and the moving pulley 28. By arranging the wire members 7 along the guide grooves 23, the wire members 7 can be smoothly moved without being in contact with each other in the axial direction and interfering with each other.

Moreover, in the present embodiment, the drum 18 is fixedly provided with respect to the base 16, and the wire member 7 is configured to slide with the inside of the guide groove 23 on the outer peripheral surface thereof as a low friction surface. As a result, even if the wire member 7 reciprocates and moves in the opposite direction (rotating directions opposite to each other) with respect to the circumferential direction of the drum 18, the wire member 7 can be smoothly moved, for example, the drum 18. A state in which the drum 18 tries to rotate in either direction due to a frictional force between the outer peripheral surface and the wire member 7, and the wire member 7 is pulled by an abnormal force, or conversely, the wire member 7 is loosened. It is possible to prevent troubles such as becoming.

Although not shown, another embodiment can be configured as follows. That is, the liquid level display device 4 may be provided with a detection switch for detecting that the position of the movable side pulley group 20 and thus the rotating shaft 17 is 0 °, that is, the liquid level S has dropped to the lowest liquid level L. .. According to this, when the insulating oil 3 leaks from the liquid tank 2, an alarm can be issued based on the detection of the detection switch, or the transformer 1 can be stopped in an emergency, which is safe. It can be improved. A detection switch for detecting that the position of the movable side pulley group 20 and thus the rotating shaft 17 has risen to 270 °, that is, the liquid level S has risen to the maximum liquid level H may be provided. 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 detection switch, or the injection can be automatically stopped, and the workability is improved. Can be planned.

Further, in the oil-filled insulating transformer of the above embodiment, the insulating oil made of mineral oil is taken as an example as the liquid stored in the liquid tank, but all insulating oils other than mineral oil and cooling liquids such as liquid silicone and water are used. It may be. The liquid-cooled electrical equipment is not limited to oil-filled isolation transformers, but can also be applied to all liquid-cooled electrical equipment in which the main body of the equipment is cooled and insulated by a coolant such as a reactor. The liquid level display device is not limited to liquid-cooled electrical equipment, and can be applied to all devices that display the height position of the liquid level.

In the above embodiment, the case where the deceleration mechanism 14 is applied to the liquid level display device 4 of the oil-filled insulation transformer 1 is taken as an example, but the deceleration mechanism can also be applied to various machinery and equipment. For example, it can be widely applied to industrial machines such as cranes, precision automated equipment for joints of arms of industrial robots, and the like. In these cases, for example, the wire member can be wound or rewound by a motor, and by increasing the reduction ratio, even a small force can generate a large force (torque) on the rotation shaft side. can.

Further, as the urging means for urging the rotation shaft to the origin position, not only the mainspring 21 but also other springs such as coil springs or weights can be adopted. If the urging means is provided in the drum 18, space can be further saved. Further, as a rewinding mechanism for returning the rotation axis to the origin position, a separate drive source such as a motor may be provided. A second deceleration mechanism having the same configuration is symmetrically combined with the original deceleration mechanism with a common rotation axis, and the second deceleration mechanism drives the rotation axis in the reverse direction to rewind the mechanism. It is also possible to configure. The fixed side mounting portion may be provided on the fixed pulley 25, or the movable side mounting portion may be provided on the movable support shaft 27. Although not described in the above embodiment, the sliding surfaces of the fixed pulley 25 and the moving pulley 28 can also be subjected to Teflon processing or the like to have low friction surfaces.

In addition, the number of moving pulleys 28 and fixed pulleys 25, the number of guide grooves 23, the fluctuation width D of the liquid level S, the movement range d, and the like are only shown as an example and can be changed as appropriate. .. 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 embodiments, and various omissions, replacements, and changes can be made without departing from the gist of the invention. These embodiments and variations thereof are included in the scope and gist of the invention, and are also included in the scope of the invention described in the claims and the equivalent scope thereof.

In the drawing, 1 is an oil-filled insulation transformer (liquid-cooled electrical equipment), 2 is a liquid tank, 3 is an insulating oil (liquid), 4 is a liquid level display device, 5 is a pulley (moving member), and 6 is a display. Instrument, 7 is a wire member, 10 is a case, 12 is a scale plate, 13 is a display needle, 14 is a deceleration mechanism, 16 is a base, 17 is a rotating shaft, 18 is a drum, 19 is a fixed side pulley group, 20 is a movable side. Pulley group, 21 is a spring (energizing means), 22 is a connecting part, 23 is a guide groove, 24 is a fixed support shaft, 25 is a fixed pulley, 26 is a fixed side mounting part, 27 is a movable support shaft, 28 is a moving part. The pulley, 29 is the movable side mounting portion, and S is the liquid level.

Claims (8)

A rotating shaft that is rotatably supported by the base,
A drum for wire guides coaxially arranged around the axis of rotation,
A fixed support shaft located on the outer peripheral side of the drum on the base and extending in parallel with the rotation axis and fixedly provided, and a plurality of rotatably fitted to the fixed support shaft so as to overlap each other in the axial direction. Fixed side pulleys with fixed pulleys,
A movable support shaft connected via a connecting portion extending in the radial direction from the rotation axis, extending in parallel with the rotation axis on the outer peripheral side of the drum, and rotatably provided around the rotation axis, and a movable support shaft thereof. A group of movable pulleys equipped with a plurality of moving pulleys rotatably inserted so as to overlap in the axial direction, and a group of movable pulleys.
It is provided with a wire member whose one end side is fixed to the fixing portion to the base or the movable side pulley group, and the other end side is arranged outside and is pulled out or fed from the outside.
The wire member is alternately hung on the fixed pulley and the moving pulley while being guided by the outer periphery of the drum, and the movement of the wire member is decelerated and rotated by pulling out or feeding the wire member from the outside. A deceleration mechanism configured to convert to shaft rotation. The deceleration mechanism according to claim 1, wherein the number of the wire members to be hung on the fixed pulley and the moving pulley is set according to the reduction ratio. One end side of the wire member is fixed to either the fixed side mounting portion provided in the fixed side pulley group or the movable side mounting portion provided in the movable side pulley group, and the fixing position thereof is set. , The deceleration mechanism according to claim 1 or 2, which is set according to the reduction ratio. The deceleration mechanism according to any one of claims 1 to 3, further comprising a rewinding mechanism for returning the rotation axis to the origin position. The deceleration mechanism according to claim 4, wherein the rewinding mechanism includes an urging means for urging the rotation axis to an origin position, and the urging means is composed of a spring. One of claims 1 to 5, wherein a plurality of guide grooves extending in the circumferential direction for guiding the wire member are formed on the outer periphery of the drum corresponding to the fixed pulley and the moving pulley. The deceleration mechanism described in. The deceleration mechanism according to any one of claims 1 to 6, wherein the drum is fixedly provided on the base, and the wire member is configured to slide on the outer peripheral surface thereof. A moving member that is placed in the liquid tank in which the liquid is stored and moves in the vertical direction in conjunction with the fluctuation of the liquid level of the liquid.
It is equipped with a display that displays the height position of the liquid level of the liquid.
The display has a scale plate in which scales corresponding to the height positions of the liquid surface are arranged in an arc shape, a display needle whose tip points to the scale of the scale plate by rotational movement, and claims 1 to 7. Equipped with the deceleration mechanism described in any one of the above,
A liquid level display device configured such that the moving member is connected to the other end side of the wire member of the deceleration mechanism and the display needle is connected to the rotating shaft of the deceleration mechanism to be rotationally moved. ..

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