JP2018004599A - Liquid surface display apparatus and liquid-cooled electrical apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow a residual amount of cooling liquid to be easily checked while enhancing a degree of freedom of a fitting position of a display.SOLUTION: A liquid surface display apparatus comprises: a moving member provided in a liquid tank storing cooling liquid which moves in a vertical direction in conjunction with variation of a level of the cooling liquid; a string member whose one end part is connected to the moving member and which is configured to be bendable and unstretchable in a longitudinal direction; a display connected to the other end of the string member for displaying a height of the moving member as a residual amount of the cooling liquid by operating in conjunction with movement of the moving member via the string member; and a pipe member configured to be bendable and unstretchable in the longitudinal direction into which the string member is inserted so as to connect between the liquid tank and the display.SELECTED DRAWING: Figure 1

Description

  Embodiments described herein relate generally to a liquid level display device and a liquid-cooled electric apparatus.

  The liquid-cooled electric device is configured by immersing an electric device such as a transformer or a reactor in a coolant such as insulating oil or liquid silicone. Such a liquid-cooled electric device needs to be able to check the remaining amount of the cooling liquid in the liquid tank from the outside of the liquid tank that stores the cooling liquid and accommodates the electric device during maintenance. . Therefore, conventionally, for example, it has been considered to provide a viewing window in the liquid tank so that the vicinity of the liquid surface inside the liquid tank can be visually recognized. However, the observation window needs to be provided in the vicinity of the liquid level so that the fluctuation of the liquid level can be directly confirmed. Therefore, the mounting position of the observation window is limited to the vicinity of the liquid level of the coolant. Therefore, the degree of freedom of the installation position of the observation window is relatively low. For example, when the liquid-cooled electric equipment is enlarged, it is provided at a high position from the installation surface, and as a result, the visibility for the operator is lowered. To do.

  Thus, for example, the configuration of the cited document 1 includes a line gauge configured in a string shape. One end of the line gauge is provided inside the air bag of the conservator, and is thereby arranged so as to move up and down as the liquid level in the liquid tank changes. The other end of the line gauge is drawn out from the liquid tank. The operator can confirm the height position of the liquid level, that is, the remaining amount of the coolant, by stretching the other end of the string member and observing the length of the string member when the string member is extended. According to this, the operator can check the remaining amount of the cooling liquid even at a position away from the liquid surface.

  However, in the above configuration, every time an operator attempts to check the remaining amount of the coolant, the box for storing the line gauge must be removed and the line gauge must be extended, which is cumbersome. In the above configuration, the line gauge is passed through a rigid metal pipe. In this case, since the drawing position of the other end of the line gauge is limited depending on the shape and arrangement of the pipe, the operator cannot easily change the drawing position of the line gauge from the pipe, that is, the confirmation position. .

JP-A-6-61069

  Therefore, an embodiment of the present invention provides a liquid level display device that can increase the degree of freedom of the mounting position of the display and can easily check the remaining amount of the cooling liquid, and a liquid cooling device including the liquid level display device. Provide electrical equipment.

  The liquid level display device of the embodiment includes a moving member that is arranged in a liquid tank in which cooling liquid is stored and moves in the vertical direction in conjunction with fluctuations in the liquid level of the cooling liquid, and one end connected to the moving member. A string member configured to be bendable and not extendable in the longitudinal direction; and the movable member connected to the other end of the string member and operating in conjunction with the movement of the movable member via the string member. A display that displays the height position of the coolant as the remaining amount of the coolant, and is configured to be bendable and non-stretchable in the longitudinal direction. A connecting pipe member.

  Moreover, the liquid-cooled electric apparatus of the embodiment includes the liquid level display device described above.

The figure which shows schematic structure of the liquid cooling type electric equipment by 1st Embodiment. The figure which shows schematically the component of the liquid level display apparatus arrange | positioned in a housing | casing about the liquid cooling type electrical equipment by 1st Embodiment. The figure which shows schematically the external appearance structure of the indicator of a liquid level display apparatus about the liquid cooling type electrical equipment by 1st Embodiment. The figure which shows schematically the internal structure of the indicator of a liquid level display apparatus about the liquid cooling type electrical equipment by 1st Embodiment. The figure which expand | deploys and shows the rotary body of a liquid level display apparatus about the liquid cooling type electrical equipment by 1st Embodiment. The figure which shows schematically the internal structure of the indicator of a liquid level display apparatus about the liquid cooling type electrical equipment by 2nd Embodiment. The figure which shows schematically the internal structure of the indicator of a liquid level display apparatus about the liquid cooling type electrical equipment by 3rd Embodiment. The figure which shows schematically the other example of the internal structure of the indicator of a liquid level display apparatus about the liquid cooling type electrical equipment by 3rd Embodiment (the 1) The figure (the 2) showing roughly the other example of the internal composition of the indicator of a liquid level display about the liquid cooling type electric equipment by a 3rd embodiment The figure which shows schematically the component of the liquid level display apparatus arrange | positioned in a housing | casing about the liquid cooling type electrical equipment by 4th Embodiment. The figure which shows schematic structure of the liquid cooling type electric equipment by 5th Embodiment The figure which shows schematically the component of the liquid level display apparatus arrange | positioned in a conservator about the liquid cooling type electric equipment by 5th Embodiment.

  Hereinafter, a plurality of embodiments will be described with reference to the drawings. In addition, the same code | symbol is attached | subjected to the substantially same element in each embodiment, and description is abbreviate | omitted.

(First embodiment)
First, a first embodiment will be described with reference to FIGS.
A liquid-cooled electric device 10 shown in FIG. 1 includes an electric device main body 20 and a liquid level display device 30. In the following description, the vertical direction with respect to the installation surface 100 of the liquid-cooled electric device 10 is the vertical direction of the liquid-cooled electric device 10.

  The electric device main body 20 has a housing 21 as an outer shell. The housing 21 accommodates electrical equipment such as a transformer and a reactor (not shown) inside. A cooling liquid 22 such as insulating oil or liquid silicone is stored inside the casing 21. An electric device (not shown) housed in the housing 21 is immersed in the coolant 22. Thereby, an electric device (not shown) accommodated in the housing 21 is cooled by the coolant 22. In this case, the housing 21 functions as a liquid tank that houses the electrical equipment and stores the coolant 22. Moreover, the housing | casing 21 has the communication part 211 as shown in FIG. The communication unit 211 is formed, for example, in a circular shape through the upper surface of the housing 21, and communicates the inside and the outside of the housing 21.

  As shown in FIG. 1, the liquid level display device 30 is provided in the casing 21 of the electric device main body 20 and displays the height position of the liquid level of the cooling liquid 22 in the casing 21, that is, the remaining amount. Specifically, the liquid level display device 30 includes a tube member 40 and a display 50. The display device 50 is detachably attached to an arbitrary surface of the housing 21 at a position where it can be easily seen by the operator.

  The pipe member 40 connects the housing 21 serving as a liquid tank and the display device 50. In the case of the present embodiment, the tube member 40 is a hollow tube made of a metal or resin bellows member, and is configured to be able to bend relatively flexibly and not to be stretchable in the longitudinal direction. The tube member 40 bends flexibly as the mounting position of the display device 50 is changed. Therefore, the user can arbitrarily change the mounting position of the display device 50 without being limited so much by the arrangement of the tube member 40.

  As shown in FIG. 2, the liquid level display device 30 includes a float 31, a telescopic part 32, a fixing member 33, a moving member 34, and a string member 35. The float 31 is configured in a hollow shape, for example, and is configured to float on the coolant 22. The float 31 is arranged so as to float on the liquid surface of the coolant 22 in the housing 21. The expansion / contraction part 32 is comprised by the cylinder shape, for example with the member which has a bellows, or a rubber member, etc., and is comprised so that expansion-contraction is possible to an up-down direction. In the case of this embodiment, although the expansion-contraction part 32 is formed in the cylindrical shape, it is not restricted to this. The lower end of the stretchable part 32 is connected to the float 31, and the upper end of the stretchable part 32 is connected to the fixing member 33.

  The fixing member 33 is configured, for example, in an annular shape, and is inserted inside the communication portion 211. The outer part of the fixing member 33 and the inner part of the communication part 211 are in close contact with each other in an airtight and watertight state. The moving member 34 is provided inside the casing 21 and inside the cylindrical portion of the extendable portion 32, and is connected to the float 31. The moving member 34 is fixed to the upper surface of the float 31. In this case, the moving member 34 is for fixing one end of the string member 35 to the float 31 and may be, for example, an adhesive tape or an adhesive. Further, the moving member 34 and the float 31 may be integrally formed.

  The string member 35 is configured to be flexibly bent and not expandable and contractable in the longitudinal direction by, for example, a metal wire. The string member 35 is passed from the outside of the housing 21 to the communication portion 211 and guided inside the housing 21 and inside the extendable portion 32. One end of the string member 35 is connected to the moving member 34, and the other end of the string member 35 is passed through the tube member 40 and drawn into the indicator 50 shown in FIG.

  The display device 50 is connected to the other end of the string member 35 and displays the height position of the moving member 34 as the liquid surface position of the coolant 22, that is, the remaining amount, as shown in FIG. The indicator 50 operates in conjunction with the movement of the moving member 34 via the string member 35, thereby displaying the height position of the moving member 34 as the remaining amount of the coolant 22. As shown in FIG. 3, the display device 50 includes a case 51, a display unit 52, and a display hand 53. The case 51 is formed in a box shape having airtightness and watertightness as a whole, and constitutes an outline of the display device 50. The other end of the tube member 40 is connected to the case 51. In this case, the inside of the case 51, the inside of the pipe member 40, and the inside of the expansion / contraction part 32 are configured as a space communicating with each other and sealed, that is, a space having airtightness and watertightness.

  The display unit 52 and the display needle 53 are accommodated in the case 51. In this case, the surface of the case 51 on the operator side is made of, for example, a transparent member, so that at least the display unit 52 and the display needle 53 are visible from the outside of the case 51.

  The display unit 52 displays the liquid level position, that is, the remaining amount of the cooling liquid 22 in the housing 21. In the case of the present embodiment, the display unit 52 indicates the current liquid level of the cooling liquid 22 present in the casing 21 as a ratio to the maximum liquid level that can be stored in the casing 21. In this case, “LOW” described on the display unit 52 means that the remaining amount of the cooling liquid 22 is small, that is, the liquid level is low, and “HIGH” means that the remaining amount of the cooling liquid 22 is large, that is, the liquid level. Means high position. The numbers “20”, “40”, “60”, and “80” in the display unit 52 indicate the ratio when the maximum liquid level is 100%.

  The display needle 53 is rotatably provided so that the tip portion thereof follows the display of the display unit 52, and indicates the current liquid surface position of the cooling liquid 22, that is, the remaining amount. Accordingly, the clockwise rotation of the display hand 53 means that the coolant 22 has increased, and the rotation of the display hand 53 counterclockwise means that the coolant 22 has decreased. .

  As shown in FIG. 4, the display device 50 includes a shaft portion 54, a rotating body 55, a support member 56, an urging member 57, and a micro switch 58. The shaft portion 54, the rotating body 55, the support member 56, the urging member 57, and the micro switch 58 are accommodated in the case 51. The shaft portion 54 is a rotation shaft configured in a columnar shape, and is provided to be rotatable in the case 51. The shaft portion 54 has a dog 541 for operating the microswitch 58. The micro switch 58 is actuated by the dog 541 when the shaft portion 54 is rotated to a position where the display hand 53 indicates “LOW”. Accordingly, the liquid level display device 30 outputs a signal indicating that the coolant 22 has been lowered to the lowest position, and the operation of the micro switch 58.

  The rotating body 55 is formed in a substantially cylindrical shape so-called drum shape. The other end of the string member 35 drawn into the case 51 is connected to the outer peripheral surface of the rotating body 55. Therefore, the string member 35 can be wound up by rotating the rotating body 55 in one direction, in this case, clockwise. The rotating body 55 is connected to the shaft portion 54 via the support member 56. Thereby, the rotating body 55 can rotate around the shaft portion 54 in the case 51. That is, the shaft portion 54 is rotatably provided in conjunction with the rotation of the rotating body 55. That is, the rotating body 55 and the shaft portion 54 can rotate integrally. In this case, the display needle 53 is provided at an end portion of the shaft portion 54 and can rotate integrally with the shaft portion 54. Thereby, the display needle 53 can indicate the rotation amount of the shaft portion 54, that is, the winding and withdrawal amount of the string member 35, as the liquid level position of the cooling liquid 22, that is, the remaining amount.

  The biasing member 57 is, for example, a tension coil spring. One end of the urging member 57 is fixed near the outer periphery of the rotating body 55, and the other end of the urging member 57 is fixed to the inner surface of the case 51. The urging member 57 is provided to urge the rotating body 55 in the winding direction of the string member 35, in this case, in the clockwise direction. The biasing member 57 is not limited to a tension coil spring, and may be, for example, a compression coil spring, a leaf spring, a spiral spring, or another elastic member other than the spring.

  Here, when the cooling liquid 22 in the casing 21 increases, that is, the liquid level position rises, the float 31 and the moving member 34 rise in conjunction with the rise of the liquid level position, thereby loosening the string member 35. On the other hand, when the cooling liquid 22 is reduced, that is, the liquid level position is lowered, the float 31 and the moving member 34 are lowered in conjunction with the drop in the liquid level position, whereby the string member 35 is pulled. Therefore, the urging force, that is, the elastic force of the urging member 57 is set to such a strength that the string member 35 can be wound and pulled out with the vertical movement of the float 31 and the moving member 34.

  In other words, the urging force of the urging member 57 is such that when the string member 35 is slackened due to the rising of the moving member 34, the rotating body 55 can rotate in the winding direction of the string member 35, in this case, clockwise. The direction in which the string member 35 is pulled out when the string member 35 is pulled by lowering 34 is set such that the rotating body 55 can rotate counterclockwise. That is, the urging force that the urging member 57 acts on the rotating body 55 is set to be smaller than the gravity that acts on the float 31 and the moving member 34. In other words, the torque acting on the rotating body 55 due to the tension of the string member 35 generated when the coolant 22 decreases is larger than the torque acting on the rotating body 55 due to the biasing force of the biasing member 57.

  According to this configuration, when the cooling liquid 22 in the casing 21 increases, that is, the liquid surface position rises, and the float 31 and the moving member 34 rise, the rotator 55 is substantially simultaneously with the loosening of the string member 35. The string member 35 that has been rotated and slackened is wound up. That is, in this case, the rotating body 55 rotates in the clockwise direction in FIG. 4 and winds the string member 35. On the other hand, when the cooling liquid 22 in the casing 21 is reduced, that is, the liquid surface position is lowered and the float 31 and the moving member 34 are lowered, the string member 35 is pulled against the urging force of the urging member 57. Then, the rotating body 55 rotates in the pulling direction of the string member 35, and thereby the string member 35 is pulled out from the case 51.

  When the rotating body 55 rotates as described above, the rotation of the rotating body 55 is transmitted to the display needle 53 via the shaft portion 54. Then, the rotation of the rotating body 55 is stopped at a position where the urging force of the urging member 57 and the tension of the string member 35 are balanced, whereby the rotation of the shaft portion 54 and the display needle 53 is also stopped. The position indicated by the display needle 53 at that time is the liquid level position of the cooling liquid 22 in the casing 21, that is, the remaining amount. Therefore, the user can confirm the remaining amount of the coolant 22 by confirming the position indicated by the display needle 53.

  In the case of the present embodiment, the rotating body 55 is made of, for example, a metal and a rectangular plate member wound into a cylindrical shape. In this case, the rotating body 55 forms a cylindrical shape by overlapping both end portions in the circumferential direction of the rotating body 55. In the case of the present embodiment, the rotating body 55 can arbitrarily change the outer diameter dimension of the rotating body 55, that is, the outer peripheral dimension of the rotating body 55, by adjusting the overlapping amount L of the both end portions.

  In this case, the rotating body 55 has a first hole portion 551 and a second hole portion 552, as shown in FIG. The 1st hole 551 is provided near the edge part of the one side of a rectangular plate-shaped member, and is formed through the rotary body 55 circularly in the thickness direction. The 2nd hole 552 is provided near the edge part of the other side of a rectangular plate-shaped member, and is formed through the rotary body 55 in the shape of a long hole in the thickness direction.

  The support member 56 is composed of, for example, one bar screw 561 and four nuts 562. In this case, the inner diameter of the first hole portion 551 and the width dimension in the short direction of the second hole portion 552 are set to be slightly larger than the outer diameter of the bar screw 561. The rod screw 561 is provided through the rotating body 55 and the shaft portion 54 in a direction perpendicular to the axial direction of the shaft portion 54. Both end portions of the bar screw 561 are fixed by nuts 562. That is, the rod screw 561 is passed through the first hole portion 551 and the second hole portion 552 from one side in the radial direction of the rotating body 55 with respect to the rotating body 55 wound in a cylindrical shape, and penetrates the shaft portion 54. After that, it is further passed through the second hole 552 on the other radial side.

  Here, in the rotating body 55, the end on the first hole 551 side in the longitudinal direction when the rotating body 55 is deployed is defined as the first end 553, and the end on the second hole 552 side is the second end 554. And In this case, when the nuts 562 at both ends of the bar screw 561 are moved to the shaft portion 54 side, that is, the radial center side of the rotating body 55, the second end portion 554 of the rotating body 55 is moved from the first end portion 553. It moves in the direction of separating, that is, the direction in which the overlap amount L increases. Thereby, the outer periphery dimension of the rotary body 55 becomes small, As a result, the outer diameter of the rotary body 55 becomes small. Further, when the nuts 562 at both ends of the bar screw 561 are moved to the shaft portion 54 side, that is, the radial outside of the rotating body 55, the second end portion 554 of the rotating body 55 approaches the first end portion 553. That is, it moves in the direction in which the overlap amount L decreases. Thereby, the outer periphery dimension of the rotary body 55 becomes large, As a result, the outer diameter of the rotary body 55 becomes large.

  In this case, the amount of fluctuation of the liquid level of the coolant 22, that is, the amount of movement of the moving member 34 in the vertical direction is equal to the amount of winding and withdrawal of the string member 35 by the rotating body 55. The rotation amount, that is, the rotation angle of the rotating body 55 correlates with the amount of winding and withdrawing the string member 35 by the rotating body 55. The rotation amount of the rotating body 55 is the same as the rotation amount of the shaft portion 54 and the display needle 53. In this case, when the fluctuation amount of the liquid level of the cooling liquid 22 is the same, the rotation amount of the rotating body 55 decreases when the outer diameter of the rotating body 55, that is, the outer peripheral dimension increases, and the rotation amount when the outer diameter of the rotating body 55 decreases. The amount of rotation of the body 55 increases. Therefore, the user can change the rotation amount of the shaft portion 54 and the display needle 53 with respect to the fluctuation amount of the liquid level of the coolant 22 by changing the outer diameter of the rotating body 55.

  According to the embodiment described above, the liquid level display device 30 includes the moving member 34, the string member 35, the tube member 40, and the display device 50. The moving member 34 is disposed in the liquid tank in which the cooling liquid is stored, in this case, the casing 21, and moves in the vertical direction in conjunction with the fluctuation of the liquid level of the cooling liquid 22. One end of the string member 35 is connected to the moving member 34, and is configured to be bendable and not extendable in the longitudinal direction. The indicator 50 is connected to the other end of the string member 35 and displays the height position of the moving member 34 as the liquid level position of the cooling liquid 22, that is, the remaining amount. The tube member 40 is configured to be bendable and not extendable in the longitudinal direction. Moreover, the string member 35 is passed through the inside of the pipe member 40, and the casing 21 which is a liquid tank and the display device 50 are connected.

  The display 50 includes a case 51, a display needle 53, a rotating body 55, a shaft portion 54, and an urging member 57. The indicator needle 53 is provided on the shaft portion 54 in the case 51, and indicates the rotation amount of the shaft portion 54 as the liquid level position of the cooling liquid 22, that is, the remaining amount. The rotating body 55 is rotatably provided in the case 51. The other end of the string member 35 is connected to the outer peripheral surface of the rotating body 55. Thereby, the rotating body 55 can wind up the string member 35. The shaft portion 54 is rotatably provided in conjunction with the rotation of the rotating body 55. The urging member 57 urges the rotating body 55 in the winding direction of the string member 35 in this case in the counterclockwise direction in FIG.

  According to this, the liquid level position of the cooling liquid 22 in the housing 21 is transmitted to the display 50 via the string member 35. For this reason, the user can confirm the liquid level position, that is, the remaining amount of the coolant 22 only by looking at the display indicated by the display needle 53 of the display 50. In this case, the user does not need to perform a special operation such as pulling the string member 35 out of the case 51 of the display device 50 and directly confirming the length of the string member 35. Therefore, the user can easily confirm the liquid level position of the cooling liquid 22, that is, the remaining amount.

  The string member 35 is passed through the inside of the tube member 40 that connects the housing 21 and the display device 50. Therefore, the attachment position of the display device 50 can be adjusted by adjusting the length dimensions of the string member 35 and the tube member 40. Therefore, the attachment position of the display device 50 is not limited to the vicinity of the liquid level of the coolant 22. Therefore, for example, even when the casing 21 is large and the liquid level position is high, the user can attach the display device 50 to a lower portion of the casing 21, that is, an easy-to-see position near the installation surface 100. As a result, the visibility of the display device 50 can be improved.

  The tube member 40 is configured to be bent relatively flexibly by a metal or resin bellows member. Therefore, the attachment position of the display device 50 is not easily limited by how the pipe member 40 is routed, the length dimension, and the like. Therefore, the degree of freedom of the attachment position of the display device 50 can be improved.

  The string member 35 and the tube member 40 are configured so as not to expand and contract in the longitudinal direction. However, in the present embodiment, this “non-stretchable” is not limited to a case where the string member 35 and the tube member 40 do not expand and contract completely. That is, the string member 35 and the tube member 40 are allowed to expand and contract to such an extent that the display accuracy by the display device 50 is not affected. Further, if the string member 35 and the tube member 40 expand or contract, that is, expand due to the influence of temperature or the like, it is preferable that the expansion and contraction rate, that is, the expansion rate, of the string member 35 and the tube member 40 is equal or close to each other.

  Here, when the remaining amount of the coolant 22 is expressed as a ratio to the maximum amount that can be stored in the housing 21, the shape and volume of the housing 21 are the same even if the moving amount of the moving member 34 in the vertical direction is the same. If they are different, the change rate of the coolant 22 is also different. For example, consider two liquid tanks whose cross-sectional areas are S1 and S2 and whose height position of the maximum liquid surface of the coolant 22 is H. In this case, when the liquid level of the cooling liquid 22 is reduced by dH, in the liquid tank having a cross-sectional area of S1, the reduction rate is dH / (S1 × H). On the other hand, in the liquid tank having a cross-sectional area of S2, the reduction rate is dH / (S2 × H). In this case, if S1> S2, dH / (S1 × H) <dH / (S2 × H). That is, even when the cooling liquid 22 is reduced by the same height dH, the liquid tank of S2 having a small cross-sectional area has a larger reduction ratio than the liquid tank of S1 having a large cross-sectional area. This is the same even when the coolant 22 increases by the height dH.

  Thus, even if the height dimension dH of the increase and decrease of the liquid level is the same, if the shape and volume of the casing 21 are different, the ratio of the increase / decrease amount to the maximum storable amount of the casing 21 is the same. Don't be. Therefore, if the shape or volume of the housing 21 changes, the ratio of the increase / decrease amount of the coolant 22 to the rotation amount of the display needle 53 also changes. Therefore, if the shape or volume of the housing 21 to which the liquid level display device 30 is attached changes, it is necessary to change the display content of the display unit 52 according to the housing 21. However, it is troublesome to change the display content of the display unit 52 every time the shape or volume of the housing 21 changes.

  Therefore, in the present embodiment, the display device 50 is configured to be able to change the rotation amount of the shaft portion 54 with respect to the winding amount of the string member 35 by the rotating body 55. The user changes the rotation amount of the shaft portion 54 with respect to the winding amount of the string member 35 by the rotating body 55, so that the value indicated by the display needle 53 by the moving member 34 matches the shape and volume of the housing 21. Can be a thing. Therefore, according to this, even if the case 21 to which the liquid level display device 30 is attached is changed, the change can be easily handled.

  In this case, the rotating body 55 is formed by winding a plate member into a cylindrical shape, and is configured such that the outer diameter can be changed by changing the overlapping amount L of both end portions of the plate member. That is, the rotation amount of the shaft portion 54 relative to the winding amount of the string member 35 by the rotating body 55 can be changed by adjusting the overlapping amount L of the rotating body 55 and changing the outer diameter of the rotating body 55. . Therefore, the user can more easily cope with the change of the casing 21 to which the liquid level display device 30 is attached.

  In addition, the liquid level display device 30 includes a float 31 and an expansion / contraction part 32. The float 31 is configured to float on the coolant 22. The stretchable part 32 is configured to be stretchable as the float 31 moves in the vertical direction. Further, the moving member 34 is provided inside the extendable part 32. And the inside of case 51, the inside of pipe member 40, and the inside of expansion-contraction part 32 are constituted in the space which has the airtightness and watertightness which were connected and sealed. According to this, moisture or the coolant 22 enters from any of the case 51, the pipe member 40, and the expansion / contraction part 32, thereby causing the display part 52 to become cloudy or provided in the case 51 such as the micro switch 58. It is possible to prevent deterioration of electronic equipment.

(Second Embodiment)
Next, a second embodiment will be described with reference to FIG.
In the second embodiment, the specific configuration of the display device 60 is different from the display device 50 of the first embodiment. That is, the display device 60 of the second embodiment includes a rotating body 61, a main driving gear 62, and a driven gear 63 in addition to the case 51, the display unit 52, the display needle 53, the shaft unit 54, and the biasing member 57. ing. The display unit 52 has the same configuration as the display unit 52 in FIG. 3, but is not shown in FIG. 6. The rotating body 61 is formed in a columnar or cylindrical shape so-called drum shape, and is provided so as to be rotatable inside the case 51. The other end portion of the string member 35 drawn into the case 51 is connected to the outer peripheral surface of the rotator 61 in the same manner as the rotator 55 of the first embodiment. That is, the rotating body 61 has the same function as the rotating body 55 of the first embodiment except that the outer diameter is configured so as not to be changed.

  The main driving gear 62 has the same rotation shaft as the rotating body 61 and is configured to be rotatable integrally with the rotating body 61. The driven gear 63 has the same rotation shaft as the shaft portion 54 and is configured to be rotatable integrally with the shaft portion 54. The main driving gear 62 and the driven gear 63 are engaged with each other. Therefore, the rotation of the rotating body 61 is transmitted to the shaft portion 54 via the main driving gear 62 and the driven gear 63. According to this, the same effect as the first embodiment can be obtained. Further, according to the present embodiment, even if the outer diameter of the rotating body 61 is not changed, the winding amount of the string member 35 by the rotating body 61 is changed by changing the gear ratio between the main driving gear 62 and the driven gear 63. The amount of rotation of the shaft portion 54 with respect to can be easily changed.

(Third embodiment)
Next, a third embodiment will be described with reference to FIG.
In 3rd Embodiment, the specific structure of the indicator 70 differs from the indicators 50 and 60 of said each embodiment. That is, in each of the above-described embodiments, the vertical movement of the moving member 34 due to the change in the liquid level is converted into the rotational movement of the rotating bodies 55 and 61 via the string member 35, whereby the indicators 50 and 60 are displayed. It was operating. On the other hand, in the third embodiment, the display device 70 is operated by converting the vertical movement of the moving member 34 accompanying the change in the liquid level into a movement in the linear direction via the string member 35.

  The display unit 70 includes a case 71, a display unit 72, a display needle 73, a guide shaft 74, a mover 75, and an urging member 76. The display unit 72, the display needle 73, the guide shaft 74, the mover 75, and the urging member 76 are accommodated in the case 71. In this case, the surface of the case 71 on the operator side is made of, for example, a transparent member, so that at least the display unit 72 and the display needle 73 are visible from the outside of the case 71. The pipe member 40 is connected to the upper surface side of the case 71. Thereby, the string member 35 is pulled into the case 71 from the upper side of the case 71.

  The display unit 72 displays the liquid level position, that is, the remaining amount of the cooling liquid 22 in the housing 21, similarly to the display unit 52 of the above embodiment. In this case, the display unit 72 indicates the current liquid level of the coolant 22 present in the casing 21 as a percentage of the maximum liquid level that can be stored in the casing 21. The display contents of the display unit 72, that is, numerical values or characters representing the remaining amount are arranged on a straight line in the vertical direction.

  The guide shaft 74 is a so-called sliding shaft formed in a columnar shape, for example, and is provided in the case 71 so as to extend in one direction, in this case, in the vertical direction. As shown in FIG. 7, the guide shaft 74 extends along the direction in which the string member 35 drawn into the case 71 extends. The mover 75 is slidably provided on the guide shaft 74. Thereby, the mover 75 can move linearly along the guide shaft 74 in the direction in which the string member 35 extends. The display needle 73 is provided on the movable element 75 and moves with the movement of the movable element 75.

  An end of the string member 35 inside the case 71 is provided on the movable element 75. The urging member 76 is provided on the mover 75. The urging member 76 causes the urging force to be applied to the moving element 75 in the direction in which the string member 35 is pulled into the case 71. The urging member 76 is a weight, for example. In this case, the urging member 76 urges the mover 75 downward by its own weight. Thereby, the tension | pulling which pulls in the direction pulled in in the case 71, ie, a downward | lower direction, always acts on the string member 35.

  In this case, the urging force of the urging member 76, that is, the weight of the urging member 76, is that the string member 35 is pulled in and out as the float 31 and the moving member 34 move up and down due to the fluctuation of the coolant 22 in the casing 21. The strength is set so that it can be pulled out. The urging member 76 is not limited to a weight, and may be an elastic member such as a tension coil spring.

  In this configuration, when the cooling liquid 22 in the casing 21 decreases and the liquid level decreases, the float 31 and the moving member 34 move downward. At that time, the string member 35 is pulled in the direction of being pulled out from the case 71, whereby the movable element 75 and the display needle 73 are moved upward along the guide shaft 74. On the other hand, when the coolant 22 in the housing 21 increases and the liquid level rises, the float 31 and the moving member 34 move upward, and the string member 35 is thereby loosened. At that time, the string member 35 is pulled into the case 71 by the biasing force of the biasing member 76. Then, the movement of the mover 75 stops at a position where the urging force of the urging member 76 and the tension of the string member 35 are balanced. The position indicated by the display needle 53 at that time is the liquid level position of the cooling liquid 22 in the casing 21, that is, the remaining amount. Therefore, the user can confirm the remaining amount of the coolant 22 by confirming the position indicated by the display needle 53.

  According to this embodiment, the same effect as each said embodiment is acquired. Further, according to the present embodiment, the display device 70 does not require the rotating bodies 55 and 61 and the like. Therefore, the configuration of the display device 70 can be simplified as compared with the above embodiments.

  For example, as shown in FIG. 8, the display unit 70 shown in FIG. 7 may be configured horizontally, or as shown in FIG. 9, the display unit 70 shown in FIG. 7 may be configured upside down. . In this case, in FIG. 8 and FIG. 9, the indicator 70 has a compression coil spring as the biasing member 76. Further, in this case, the moving element 75 moves in the horizontal direction in the display unit 70 in FIG. 7, and the moving element 75 moves in the up and down direction in the display unit 80 in FIG.

  In the display 70 shown in FIGS. 8 and 9, the case 71 has introduction portions 711 and 712. The introduction parts 711 and 712 are formed integrally with the case 71, for example, and are formed in a tubular shape to communicate the inside and the outside of the case 71. One end of the introduction portions 711 and 712 opens toward the upper side of the case 71. In the display device 70 shown in FIG. 8, the other end of the introduction portion 711 is on the side of the case 71 and opens toward the inside of the case 71. In the display device 70 shown in FIG. 9, the other end of the introduction portion 712 is on the lower surface side of the case 71 and opens toward the inside of the case 71. The string member 35 is drawn into the case 71 from the side surface side of the case 71 through the introduction portions 711 and 712.

  In this case, the string member 35 bends when it is drawn into the case 71 through the introduction portions 711 and 712. Therefore, the indicator 70 in FIGS. 8 and 9 has a rotatable pulley 77. The pulley 77 is provided in a portion where the string member 35 is bent in the introduction portions 711 and 712, and supports the portion where the string member 35 is bent. Thereby, the movement of the string member 35, that is, the drawing into the case 71 and the drawing out from the case 71 become smooth. A pulley 77 may be provided outside the case 71.

(Fourth embodiment)
Next, a fourth embodiment will be described with reference to FIG.
In 3rd Embodiment, the specific structure in the housing | casing 21 in the liquid level display apparatus 30 differs from said each embodiment. That is, in the third embodiment, the liquid level display device 30 includes a cylindrical member 81, a float 82, and a moving member 83. The cylindrical member 81 is formed in a cylindrical shape using, for example, a nonferrous metal or resin that does not have magnetism. The lower end portion of the cylindrical member 81 is closed and the upper end portion is opened.

  The cylindrical member 81 is disposed in the casing 21 that serves as a liquid tank. The upper end portion of the cylindrical member 81 is passed through the communication portion 211. In this case, the outer part of the cylindrical member 81 and the inner part of the communication part 211 are in close contact with each other in a state of having airtightness and watertightness. Further, the lower end portion of the cylindrical member 81 extends downward from the liquid level, that is, the maximum liquid level position when at least the maximum amount of the cooling liquid 22 is stored so as to sink in the cooling liquid 22.

  The float 82 is configured to be able to float on the coolant 22 by, for example, forming a part of the interior in a hollow state. Moreover, the float 82 is formed in the column shape which covers the outer peripheral side of the cylindrical member 81, for example. When the liquid level of the coolant 22 fluctuates, the float 82 moves in the vertical direction along the outer peripheral surface of the cylindrical member 81 with the fluctuation.

The moving member 83 is disposed in the casing 21 and in the cylindrical member 81. And the float 82 and the moving member 83 are comprised so that the attraction by magnetic force may mutually act. That is, at least one of the float 82 and the moving member 83 is composed of a magnet. Further, in this case, of the float 82 and the moving member 83, the non-magnet is made of a metal having magnetism. And the inside of case 51, the inside of pipe member 40, and the inside of cylindrical member 81 are constituted in the space which has the airtightness and watertightness which were connected and sealed.
Also by this, the same effect as each said embodiment is acquired.

(Fifth embodiment)
Next, a fifth embodiment will be described with reference to FIGS.
In the fifth embodiment, the liquid-cooled electric device 10 further includes a conservator 23. In this case, the liquid level display device 30 displays the remaining amount of the cooling liquid 22 in the conservator 23. The conservator 23 has a well-known configuration, and has an air bag 231 that absorbs fluctuations in the coolant 22 as shown in FIG. Further, the conservator 23 has a communication part 232 that communicates the inside and the outside. The communication part 232 of the conservator 23 has the same function as the communication part 211 of the housing 21 in the above embodiment. That is, the fixing member 33 is fixed by being passed through the communication portion 232.

  The moving member 34 of the liquid level display device 30 is provided on the lower inner surface in the air bag 231. In this case, the moving member 34 is for fixing one end of the string member 35 to the lower inner surface of the air bag 231, and may be, for example, an adhesive tape or an adhesive. Further, the moving member 34 and the air bag 231 may be integrally formed. And the inside of case 51, the inside of pipe member 40, and the inside of air bag 231 are constituted in the space which has the airtightness and watertightness which were connected and sealed.

  With this configuration, the same effects as those of the above embodiments can be obtained. That is, when the remaining amount of the coolant 22 in the conservator 23 changes and the air bag 231 expands and contracts, the moving member 34 moves in the vertical direction due to the expansion and contraction of the air bag 231. Then, the movement of the moving member 34 in the vertical direction is transmitted to the display 50 via the string member 35, and the display hand 53 rotates. Thereby, the user can easily confirm the remaining amount of the cooling liquid 22 in the conservator 23 by reading the content indicated by the display needle 53 of the display device 50 as in the above embodiments.

  The above embodiments may be configured as follows, for example. That is, instead of the display unit 52 and the display needle 53, for example, a digital display unit capable of segment display is provided, and an encoder for detecting the rotation amount of the rotating bodies 55 and 61 or the shaft unit 54 is provided. Then, based on the detection result of the encoder, that is, the rotation amount of the rotating bodies 55 and 61, the remaining amount of the coolant 22 is digitally displayed on the digital display unit. Also by this, the same effect as each said embodiment is acquired.

  Although several embodiments of the present invention have been described above, these embodiments 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, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

  In the drawings, 10 is a liquid-cooled electric device, 23 is a conservator, 231 is an air bag, 30 is a liquid level display device, 34 is a moving member, 35 is a string member, 40 is a pipe member, 50 is a display, 51 is Case, 53 is a display needle, 54 is a shaft, 55 is a rotating body, 57 is a biasing member, 60 is a display, 61 is a rotating body, 70 is a display, 71 is a case, 73 is a display needle, and 75 is a movement 76, an urging member, 81 a cylindrical member, 82 a float, and 83 a moving member.

Claims (9)

A moving member that is arranged in a liquid tank in which the cooling liquid is stored and moves up and down in conjunction with a change in the liquid level of the cooling liquid;
A string member having one end connected to the moving member and bendable and not stretchable in the longitudinal direction;
An indicator that is connected to the other end of the string member and operates in conjunction with the movement of the moving member via the string member to display the height position of the moving member as the remaining amount of the coolant;
A tube member which is bendable and is not stretchable in the longitudinal direction, and the string member is passed through and connects between the liquid tank and the indicator;
A liquid level display device. The indicator is
Case and
A rotating body that is rotatably provided in the case, and is capable of winding the string member by connecting the other end of the string member to an outer peripheral surface;
A shaft portion rotatably provided in conjunction with the rotation of the rotating body;
An indicator needle provided on the shaft portion and indicating the amount of rotation of the shaft portion as the remaining amount of the coolant;
A biasing member that biases the rotating body in a winding direction of the string member,
The liquid level display device according to claim 1. The indicator can change a rotation amount of the shaft portion with respect to a winding amount of the string member by the rotating body.
The liquid level display device according to claim 2. The rotating body is formed by winding a plate member into a cylindrical shape, and the outer diameter can be changed by changing the overlapping amount of both end portions of the plate member.
The liquid level display device according to claim 3. The indicator is
Case and
A mover that is provided in the case and is linearly movable in a direction in which the string member extends;
An indicator needle provided on the shaft portion to indicate the amount of movement of the moving element as the remaining amount of the coolant;
A biasing member that biases the mover in a direction in which the string member is pulled into the case;
The liquid level display device according to claim 1. A float configured to float in the coolant;
An elastic part that expands and contracts as the float moves in the vertical direction,
The moving member is provided inside the stretchable part,
The interior of the case, the interior of the tube member, and the interior of the stretchable part are configured in a sealed and sealed space.
The liquid level display apparatus as described in any one of Claim 1 to 5. A float configured to float in the coolant;
A cylindrical member that is configured in a cylindrical shape and disposed in the liquid storage tank in a state in which the moving member is accommodated, and
The inside of the case, the inside of the tube member, and the inside of the cylindrical member are configured in a sealed and sealed space,
The float and the moving member are attracted to each other by magnetic force and are configured to be movable integrally.
The liquid level display apparatus as described in any one of Claim 1 to 5. The moving member is provided inside the air bag of the conservator,
The interior of the case, the interior of the tube member, and the interior of the air bag are configured in a sealed and sealed space.
The liquid level display apparatus as described in any one of Claim 1 to 5.   A liquid-cooled electric apparatus comprising the liquid level display device according to claim 1.

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