WO2015001774A1

WO2015001774A1 - Liquid level detection apparatus

Info

Publication number: WO2015001774A1
Application number: PCT/JP2014/003440
Authority: WO
Inventors: 鈴木　直人
Original assignee: 株式会社デンソー
Priority date: 2013-07-04
Filing date: 2014-06-27
Publication date: 2015-01-08
Also published as: JP2015014513A

Abstract

This liquid level detection apparatus is provided with: a fixed body (20), which has a fixed body main section (22) that is fixed to a container (90) having a liquid stored therein, and a shaft section (23, 223, 323) that cylindrically protrudes from the fixed body main section (22); a float (30), which is formed to float in a liquid, and is provided with an insertion hole (31) for having the shaft section (23, 223, 323) inserted therein, said float being assembled to the fixed body (20) such that the float can move in the vertical direction (VD) by having the shaft section (23, 223, 323) inserted in the insertion hole (31); a magnet section (50), which is held by means of the float (30), and generates a magnetic field; and a switch mechanism (40), which is housed in the shaft section (23, 223, 323), and has the state thereof switched from an off-state to the on-state due to proximity of the magnet section (50). In a cross-section of the shaft section (23, 223, 323), a height (h) in the vertical direction (VD) is smaller than a width (w) in the horizontal direction (WD).

Description

Liquid level detector

Cross-reference of related applications

This disclosure is based on Japanese Application No. 2013-141029 filed on July 4, 2013, the contents of which are incorporated herein by reference.

The present disclosure relates to a liquid level detection device used for a container for storing a liquid.

Conventionally, as a type of liquid level detection device, for example, Patent Document 1 discloses a configuration including a detector body fixed to a tank and a float formed to float on a liquid. In this configuration, the float is assembled to the detector main body so as to be movable in the vertical direction by inserting the insertion portion formed in the detector main body into the insertion hole formed in the float.

In addition, a sensor magnet is held in the float, and a reed switch is accommodated in the insertion portion provided in the detector body. With the above configuration, when the sensor magnet approaches the reed switch due to a change in the liquid level, the reed switch is switched from the off state to the on state.

JP 2010-107370 A

Now, in the above-described configuration, the float can move in the vertical direction with respect to the detector main body by a distance that allows the insertion portion to move in the vertical direction in the insertion hole. Therefore, as the height of the insertion portion increases, the distance that the float can move in the vertical direction (hereinafter referred to as “stroke amount”) decreases. Thereby, it may be difficult to ensure the distance between the sensor magnet and the reed switch.

Here, the liquid level detection device can be used in an environment that receives the action of magnetic noise from the outside. Then, the direction of magnetic noise acting from the outside may coincide with the direction of the magnetic field generated by the sensor magnet. In this case, the magnetic field of the sensor magnet is strengthened by magnetic noise. For this reason, in a liquid level detection device in which the distance between the sensor magnet and the reed switch is insufficient, even if the sensor magnet is farthest from the reed switch, the reed switch cannot be switched from the on state to the off state. It will end up.

The present disclosure has been made in view of the above problems, and an object of the present disclosure is to provide a liquid level detection device having improved resistance to magnetic noise acting from the outside.

In order to achieve the above object, one aspect of the present disclosure includes a fixed main body portion fixed to a container for storing a liquid, a fixed body having a shaft portion protruding in a cylindrical shape from the fixed main body portion, and a liquid. An insertion hole is formed so as to float and the shaft portion is inserted. The float is assembled to the fixed body so as to be movable in the vertical direction by inserting the shaft portion into the insertion hole, and is held by the float to generate a magnetic field. A magnet portion and a switch mechanism that is accommodated in the shaft portion and switches from an off state to an on state by the proximity of the magnet portion, and in the cross section of the shaft portion, the vertical height is smaller than the horizontal width The liquid level detection device is characterized by this.

The cross section of the shaft portion in this aspect has a shape in which the vertical height is smaller than the horizontal width. By suppressing the height of the shaft portion in this way, the distance that the shaft portion can move in the vertical direction within the insertion hole, that is, the stroke amount that the float can move in the vertical direction with respect to the fixed body is increased. The According to the above, since the distance between the magnet unit and the switch mechanism can be secured, even when the direction of the magnetic field generated by the magnet unit coincides with the direction of the external magnetic noise, the switch mechanism is separated by the separation of the magnet unit. It can be switched from the on state to the off state. Therefore, it is possible to provide a liquid level detection device with improved resistance to external magnetic noise.

The above and other objects, features and advantages of the present disclosure will become more apparent from the following detailed description with reference to the accompanying drawings. The drawing
It is a figure which shows the state in which the liquid level detection apparatus by 1st embodiment was installed in the washer tank. It is the top view which looked at the reed switch connected to the terminal by a first embodiment from the upper surface. It is a perspective view of the reed switch connected to the terminal by a first embodiment. FIG. 4 is a view showing a cross-sectional shape of the reed switch shaft, and is a cross-sectional view taken along line IV-IV in FIG. 1. FIG. 5A is a diagram for explaining in detail the principle that the maximum separation distance from the reed switch to the magnet is increased by forming the cross section of the reed switch shaft in a non-circular shape according to the first embodiment. . FIG. 5B is a diagram illustrating the operation of the float when the cross section is formed into a perfect circle for comparison. It is a top view of the terminal and reed switch by a second embodiment. It is sectional drawing which shows the shape of the cross section of the reed switch axis | shaft by 2nd embodiment. It is sectional drawing which shows the shape of the cross section of the reed switch axis | shaft by 3rd embodiment.

Hereinafter, a plurality of embodiments will be described with reference to the drawings. In addition, the overlapping description may be abbreviate | omitted by attaching | subjecting the same code | symbol to the corresponding component in each embodiment. When only a part of the configuration is described in each embodiment, the configuration of the other embodiment described above can be applied to the other part of the configuration. Moreover, not only the combination of the configurations explicitly described in the description of each embodiment, but also the configuration of a plurality of embodiments can be partially combined even if they are not explicitly described, as long as there is no problem in the combination. And the combination where the structure described in several embodiment and the modification is not specified shall also be disclosed by the following description.
(First embodiment)
The liquid level detection device 100 according to the first embodiment shown in FIG. 1 is attached to a washer tank 90. The washer tank 90 is mounted, for example, in the engine room of the vehicle and stores washer liquid as a liquid. The liquid level detection device 100 detects a decrease in the liquid level accompanying a decrease in the washer liquid stored in the washer tank 90. The liquid level detection device 100 is inserted into the tank 90 through an opening 91 formed in the washer tank 90.

First, the configuration of the liquid level detection device 100 will be described. In the following description, the axial direction AD is defined along the direction in which the liquid level detection device 100 is inserted into the opening 91. Further, a vertical direction VD is defined along the gravity direction. A direction substantially orthogonal to the axial direction AD and the vertical direction VD is defined as a horizontal direction WD.

The liquid level detection device 100 includes a housing 20, a float 30, a magnet 50, and a reed switch 40.

The housing 20 includes a main body member 21, a connector member 28, and the like. The main body member 21 is fixed to the washer tank 90. The main body member 21 includes a lid portion 22, a reed switch shaft 23, and a restriction portion 26. The lid portion 22 is provided in an annular shape on the main body member 21 and is larger than the opening 91. The lid 22 liquid-tightly closes the opening 91 from the outside of the washer tank 90. The reed switch shaft 23 protrudes in a cylindrical shape from the lid portion 22 along the axial direction AD. The reed switch shaft 23 forms an accommodating chamber 24 for accommodating the reed switch 40 by a shape extending in the axial direction AD. A flange 25 is formed at the tip of the reed switch shaft 23 in the extending direction. The collar portion 25 is formed in a longitudinal plate shape having the horizontal direction WD as a longitudinal direction. The restricting portion 26 is a wall portion extending in the vertical direction VD. The regulating unit 26 regulates the rotation of the float 30 around the reed switch shaft 23 by contacting the float 30.

The float 30 is formed of a material having a specific gravity smaller than that of the washer liquid so that the float 30 can float on the liquid surface of the washer liquid. Specifically, the float 30 is formed of a polypropylene resin or the like to which a foaming agent is added. The float 30 is formed in a cylindrical shape extending in the axial direction AD. The float 30 is provided with a through hole 31 and a convex wall portion 32. The through hole 31 is an insertion hole into which the reed switch shaft 23 is inserted. The through hole 31 penetrates the float 30 in the axial direction AD. The inner width of the through hole 31 in the horizontal direction WD is made smaller than the outer width of the flange 25 in the horizontal direction WD. When the reed switch shaft 23 is inserted into the through hole 31, the float 30 can be prevented from being detached from the reed switch shaft 23. With such a configuration, the float 30 is assembled to the housing 20 and can move up and down with respect to the housing 20. The convex wall portion 32 is formed at one end portion close to the main body member 21 among both end portions in the axial direction AD of the float 30. The convex wall part 32 is extended along the up-down direction VD. When the float 30 tries to rotate around the reed switch shaft 23, the convex wall portion 32 maintains the posture of the float 30 by contacting the restricting portion 26.

The magnet 50 is a permanent magnet such as a ferrite magnet and generates a magnetic field. The magnet 50 has a rectangular cross section and is formed in a prismatic shape extending in the axial direction AD. The magnet 50 is held by the float 30 and is located above the reed switch shaft 23. The magnet 50 can move up and down following the liquid level together with the float 30.

The reed switch 40 is a switch mechanism for detecting the liquid level. The reed switch 40 includes a switch main body 43 that extends in a cylindrical shape along the axial direction AD, and a pair of

leads

41 and 42 that protrude from both ends of the switch main body 43. The reed switch 40 is accommodated in the accommodating chamber 24 in a posture in which the axial direction of the switch main body 43 is aligned with the axial direction AD. The switch main body 43 is a hollow glass tube and accommodates the ends of the leads 41 and 42 (hereinafter referred to as “lead ends”). Each lead end portion is provided so as to be able to bend, and faces each other with a predetermined interval. When a magnetic field is applied to the

leads

41 and 42 from the outside, the lead ends are attracted to each other by being magnetized to different magnetic poles. When the lead ends contact in this manner, the reed switch 40 is turned on so that it can be conducted between the

leads

41 and 42.

In the liquid level detection device 100 described above, the float 30 is displaced upward with respect to the reed switch shaft 23 when the liquid level of the washer liquid is sufficiently high. In this case, since the magnet 50 is separated from the reed switch 40, the reed switch 40 is turned off. On the other hand, when the washer liquid stored in the washer tank 90 is reduced, the float 30 is displaced downward (in the direction of gravity) with respect to the reed switch shaft 23. When the magnet 50 approaches the reed switch 40 in this manner, the reed switch 40 is switched from the off state to the on state by the magnetic field generated by the magnet 50.

Here, in the engine room where the liquid level detection device 100 is installed, there are a large number of magnets incorporated in the prime mover and the generator. The magnetic force generated by these magnets acts on the liquid level detection device 100 as external magnetic noise. If the direction of the magnetic field by the magnet 50 matches the direction of the magnetic noise, the magnetic field by the magnet 50 is strengthened by the magnetic noise. As a result, even when the magnet 50 is far from the reed switch 40, the reed switch 40 may remain on. The configuration of the liquid level detection apparatus 100 for avoiding such a situation will be described below.

As shown in FIG. 1, a pair of

terminals

60 and 70 are accommodated in the accommodation chamber 24. Each of the

terminals

60 and 70 is a transmission member that transmits a signal indicating an on state and an off state of the reed switch 40. Each terminal 60, 70 is formed in a strip shape extending along the axial direction AD. A part of each of the

terminals

60 and 70 is embedded in the connector member 28 by insert molding. One terminal 60 is formed shorter than the terminal 70. The terminal 60 is connected to the lead 41 by soldering or the like on the connector member 28 side of the switch main body 43.

The other terminal 70 extends to the vicinity of the tip of the reed switch shaft 23 along the axial direction AD. The terminal 70 is connected to the lead 42 by soldering or the like on the side opposite to the connector member 28 with the switch body 43 interposed therebetween. As shown in FIGS. 2 to 4, the terminal 70 is formed with a long hole 71. The long hole 71 is an opening whose longitudinal direction is the axial direction AD, and penetrates the terminal 70 in the plate thickness direction by punching or the like. The long hole 71 is entirely surrounded by the material for forming the terminal 70. The inner method of the long hole 71 in the axial direction AD is longer than the length of the switch main body 43 in the axial direction AD. The inner method of the long hole 71 in the horizontal direction WD is slightly smaller than the outer diameter of the switch main body 43.

By providing the long hole 71 in the center of the terminal 70 in the horizontal (width) direction WD, a pair of extending

portions

72 and 73 are formed on both sides of the long hole 71 in the horizontal direction WD. Further, both

end portions

74 and 75 of the terminal 70 are formed on both sides of the long hole 71 in the axial direction AD. The pair of extending

portions

72 and 73 extend from the proximal end portion 74 of the terminal 70 to the distal end portion 75.

By arranging the switch main body 43 in the long hole 71, the pair of extending

portions

72 and 73 are arranged on both sides of the switch main body 43 in the horizontal direction WD. The pair of extending

portions

72 and 73 cause the

ridge line portions

72 a and 73 a on the inner side and the upper side in the width direction to contact the switch main body portion 43. With the above arrangement, the switch main body 43 that is in contact with both the pair of extending

portions

72 and 73 is restricted from moving in the horizontal direction WD. Furthermore, the lead 42 is placed on the upper surface of the end portion 75 on the distal end side by the arrangement of the switch main body portion 43 in the long hole 71.

According to the shape and arrangement of the terminal 70 described so far, as shown in FIG. 4, the

assembly structures

40 and 70 accommodated in the accommodation chamber 24 are reduced in height in the vertical direction VD and are also in the horizontal direction WD. Exhibits a flattened shape. Corresponding to the shape of these

assembly structures

40 and 70, the cross section perpendicular to the axial direction AD in the reed switch shaft 23 is formed in a symmetrical isosceles triangle shape. In the cross section of the reed switch shaft 23, the height h in the vertical direction VD is smaller than the width w in the horizontal direction WD.

Due to the cross-sectional shape of the reed switch shaft 23 described above, the distance between the reed switch 40 and the magnet 50 when the magnet 50 is farthest away (hereinafter referred to as “maximum separation distance d — 1”) is enlarged. 5 (A) and (B) will be described.

The stroke amounts St_1 and St_2 of the float 30 are determined by the inner method of the through hole 31 in the vertical direction VD and the respective heights h (see FIG. 4) of the

reed switch shafts

23 and 123 in the vertical direction VD. Here, it is assumed that the height h of the reed switch shaft 23 is reduced by Δh compared to the reed switch shaft 123 having a perfect circle shape due to the non-circular cross-sectional shape flat in the horizontal direction WD. Thereby, the stroke amount St_1 can be larger than the stroke amount St_2 by a distance substantially equal to Δh which is a reduction of the height h. Therefore, the maximum separation distance d_1 from the reed switch 40 to the magnet 50 in the non-circular cross section is about Δh larger than the maximum separation distance d_2 from the reed switch 40 to the magnet 50 in the true circular section.

In the first embodiment described so far, the maximum separation distance d_1 between the magnet 50 and the reed switch 40 can be ensured by increasing the stroke amount St_1 of the float 30. Therefore, even when the direction of the magnetic field generated by the magnet 50 matches the direction of the external magnetic noise, the reed switch 40 can be switched from the on state to the off state by the separation of the magnet 50. Therefore, it is possible to provide the liquid level detection device 100 with improved resistance to external magnetic noise.

In addition, in the form in which the terminal 70 is accommodated in the accommodation chamber 24 as in the first embodiment, the extending

portions

72 and 73 are preferably arranged in the horizontal direction WD of the switch body portion 43. With the arrangement of the extending

portions

72 and 73, the height h in the vertical direction VD of the reed switch shaft 23 that contributes to an increase in the stroke amount St_1 can be suppressed. On the other hand, the storage chamber 24 is expanded in the horizontal direction WD that hardly affects the stroke amount St_1, so that the storage chamber 24 can secure a capacity for storing the reed switch 40 and the terminal 70. As described above, the configuration in which the extending

portions

72 and 73 are arranged in the horizontal direction WD of the switch main body portion 43 is useful for increasing the stroke amount St_1.

Further, as in the first embodiment, when the pair of extending

portions

72 and 73 are located on both sides of the switch main body portion 43, each extending portion 72 is secured while ensuring the strength of the terminal 70 that supports the reed switch 40. 73 can be made thin. In this way, by reducing the size of the extending

portions

72 and 73, the reed switch shaft 23 can reduce not only the height h in the vertical direction VD but also the width w in the horizontal direction WD.

Further, as in the first embodiment, if the long hole 71 is punched from the terminal 70, the pair of extending

portions

72 and 73 can be easily formed in the terminal 70. Further, if the pair of extending

portions

72 and 73 are continuous with each other at both

end portions

74 and 75, it becomes easier to maintain both the strength of the terminal 70 and the downsizing of the extending

portions

72 and 73. Furthermore, when the terminal 70 is insert-molded in the connector member 28, the end portion 74 on the base end side can exhibit a function of preventing the molten molding material from flowing into the long hole 71.

In addition, in the first embodiment, the switch 42 is disposed between the extending

portions

72 and 73 so that the lead 42 is placed on the end portion 75 on the distal end side. Further, the switch main body 43 is restricted from moving in the horizontal direction WD by the contact between the switch main body 43 and the extending

portions

72 and 73. With the above operation, the lead 42 is stably positioned with respect to the end portion 75. Therefore, the connection process for connecting the lead 42 to the terminal 70 can be easily performed.

In the first embodiment, the housing 20 corresponds to a “fixed body”, the lid 22 corresponds to a “fixed main body”, and the reed switch shaft 23 corresponds to a “shaft”. Further, the through hole 31 corresponds to an “insertion hole”, the reed switch 40 corresponds to a “switch mechanism”, and the lead 42 corresponds to a “connecting portion”. Further, the magnet 50 corresponds to a “magnet part”, the terminal 70 corresponds to a “transmission member”, and the washer tank 90 corresponds to a “container”.
(Second embodiment)
The second embodiment shown in FIGS. 6 and 7 is a modification of the first embodiment. The terminal 270 of the second embodiment is formed with a notch 271 corresponding to the long hole 71 (see FIG. 2) of the first embodiment. The cutout 271 is formed by punching or the like, similarly to the long hole 71. The notch 271 has a shape with the axial direction AD as a longitudinal direction, and partially reduces the width of the terminal 270. A portion whose width is reduced by the notch 271 is an extended portion 272 in the terminal 270. The extending portion 272 is arranged on one side of the switch body portion 43 in the horizontal direction WD. The extending part 272 may be separated from the switch main body part 43 or may be in contact with the switch main body part 43.

Also by the shape and arrangement of the terminal 270 described above, the

assembly configurations

40 and 270 accommodated in the accommodation chamber 24 are flattened with the height in the vertical direction VD reduced and extended in the horizontal direction WD. Therefore, also in the cross section of the reed switch shaft 223, the height h in the vertical direction VD is smaller than the width w in the horizontal direction WD. As shown in FIG. 7, the cross section of the reed switch shaft 223 is formed in a left-right asymmetric shape in which two arcs having different curvature radii are connected to each other by a straight line.

Even in the second embodiment described so far, the same effects as in the first embodiment can be obtained, and the maximum separation distance d_1 between the magnet 50 and the reed switch 40 can be secured as the stroke amount St_1 increases. Therefore, resistance to external magnetic noise can be improved (see FIG. 5A). In the second embodiment, the reed switch shaft 223 corresponds to the “shaft portion” and the terminal 270 corresponds to the “transmission member”.
(Third embodiment)
The third embodiment shown in FIG. 8 is another modification of the first embodiment. In the third embodiment, the terminal 370 extending in a strip shape is accommodated in the accommodating chamber 24 in a posture in which the width direction is along the vertical direction VD. According to such a posture of the terminal 370, the terminals 370 with sufficient strength can be arranged in the horizontal direction WD of the switch main body 43 without forming the long hole 71 (see FIG. 2) or the like. The cross section of the reed switch shaft 323 that accommodates the reed switch 40 and the terminal 370 is formed in an elliptical shape with the horizontal direction WD as the major axis. With such a cross-sectional shape, the height h in the vertical direction VD of the reed switch shaft 323 is made smaller than the width w in the horizontal direction WD.

Since the third embodiment described so far has the same effect as the first embodiment, the maximum separation distance d_1 (see FIG. 5A) between the magnet 50 and the reed switch 40 can be ensured. Therefore, resistance to external magnetic noise can be improved. In the third embodiment, the reed switch shaft 323 corresponds to the “shaft portion” and the terminal 370 corresponds to the “transmission member”.

Although a plurality of embodiments have been described above, the present disclosure is not construed as being limited to the above-described embodiments, and can be applied to various embodiments and combinations without departing from the scope of the present disclosure. it can. A modification of the above embodiment will be described.

In the above embodiment, since the liquid level detection device is secured against magnetic noise, the types of liquid level detection devices can be reduced. More specifically, in the conventional liquid level detection device, since the resistance to magnetic noise is insufficient, the direction of the magnetic force generated by the magnet needs to be opposite to the direction of the magnetic noise. With such an arrangement, the magnetic force and magnetic noise of the magnet cancel each other, so that the malfunction of the reed switch due to the magnetic noise is less likely to occur. However, with the above-described measures, it may be necessary to provide a new type in which the magnet mounting direction is changed for each vehicle model to which the liquid level detection device is mounted. On the other hand, in the liquid level detection device according to the above embodiment, resistance to magnetic noise is ensured by increasing the maximum separation distance from the reed switch to the magnet. Therefore, regardless of the vehicle type to which the liquid level detection device is attached, the same type of liquid level detection device can be employed. For these reasons, there is no need to change the direction of the reed switch, the direction of the magnet, etc. for each vehicle type, and the cost of the liquid level detection device can be reduced by reducing the types.

In the above embodiment, the casing is assembled as a “fixed body” in the opening of the washer tank. However, the configuration corresponding to the “fixed body” may be changed as appropriate. For example, an assembly in which a bracket or the like is combined with the above-described housing may correspond to a “fixed body”. Further, the shape of the cross section of the reed switch shaft may be different from the above-described shapes as long as the height in the vertical direction VD can be suppressed. Furthermore, the shape of the “insertion hole” may be appropriately changed according to the shape of the reed switch shaft. For example, the “insertion hole” does not have to penetrate the float as in the above embodiment.

In the above embodiment, the terminals extending in the form of a strip are arranged in the horizontal direction WD of the switch body. However, such a “transmission member” may not be a strip-shaped member. For example, a rod-like member or a prism-like member similar to the lead 42 may be arranged in the horizontal direction WD of the switch body as a “transmission member”. Similarly, the shape of the “connecting portion” of the reed switch 40 may be a belt-like shape such as a terminal.

In the first and second embodiments, a long hole or a notch was formed by punching the terminal. Here, when forming a notch like 2nd embodiment, in order to prevent damage to a terminal, it may be necessary to hold down a terminal at the time of punching. Therefore, if the extending portion is formed in the terminal by punching, a form in which the long hole 71 is punched as in the first embodiment is preferable.

In the above embodiment, the prismatic magnet is used as the “magnet part”, but the shape, material, and the like of the configuration corresponding to the “magnet part” may be changed as appropriate. Furthermore, the posture in which the “magnet part” is held may be changed as appropriate. Furthermore, a “magnet part” may be configured by a plurality of magnets. In addition, the position where the “magnet part” is attached may be below the reed switch. Further, the configuration corresponding to the “switch mechanism” is not limited to the above-described reed switch, and may be changed as appropriate.

In the first embodiment, when the switch main body 43 is disposed between the extending

portions

72 and 73, they are in contact with each other. However, the switch main body 43 may be separated from the extending

portions

72 and 73. Further, in the first embodiment, the height of the lead 42 extending from the switch main body 43 and the height of the end portion 75 on the distal end side are matched. However, these positions may be shifted in the vertical direction VD. Further, the tip end may be bent upward so that the lead is picked up. However, such bending of the end portion may hinder removal of the molded product from the mold when the terminal 70 is insert-molded in the connector member 28. Therefore, it is desirable that the end portion on the distal end side is not provided with a bend that leads to the lead 42.

As described above, the description is based on the example applied to the liquid level detection device that detects the level of the level of the washer liquid stored in the vehicle washer tank, but the application target of the present disclosure is the level of the level of the washer liquid. It is not limited to detection. The present disclosure can be applied to a liquid level detection device in a container for other liquids mounted on a vehicle, such as engine oil, brake fluid, engine cooling water, and fuel. Furthermore, the present disclosure is applicable not only to vehicles but also to liquid level detection devices used in containers for various consumer devices and various transport machines.

Although the present disclosure has been described based on the embodiments, it is understood that the present disclosure is not limited to the embodiments and structures. The present disclosure includes various modifications and modifications within the equivalent range. In addition, various combinations and forms, as well as other combinations and forms including only one element, more or less, are within the scope and spirit of the present disclosure.

Claims

A fixed body (20) having a fixed main body (22) fixed to a container (90) for storing a liquid and a shaft (23, 223, 323) protruding in a cylindrical shape from the fixed main body (22). When,
An insertion hole (31) is formed to float on the liquid and into which the shaft portion (23, 223, 323) is inserted. The shaft portion (23, 223, 323) is inserted into the insertion hole (31). A float (30) assembled to the fixed body (20) so as to be movable in the vertical direction (VD)
A magnet portion (50) that is held by the float (30) and generates a magnetic field;
A switch mechanism (40) housed in the shaft part (23, 223, 323) and switched from an off state to an on state by the proximity of the magnet part (50),
In the cross section of the shaft (23, 223, 323), the height (h) in the vertical direction (VD) is smaller than the width (w) in the horizontal direction (WD). .
A transmission member (70) accommodated in the shaft (23, 223, 323) and connected to the switch mechanism (40) to transmit a signal indicating an on state and an off state of the switch mechanism (40). , 270, 370),
The transmission member (70, 270, 370) extends along the axial direction (AD) of the shaft portion (23, 223, 323) and is aligned in the horizontal direction (WD) of the switch mechanism (40). The liquid level detection device according to claim 1, wherein a stretched portion (72, 73, 272) to be formed is formed.
The pair of extending portions (72, 73) positioned on both sides in the horizontal direction (WD) of the switch mechanism (40) are formed in the transmission member (70). The liquid level detection apparatus described.
The transmission member (70) is formed in a strip shape extending along the axial direction (AD), and the longitudinal direction (AD) is a length between the pair of extending portions (72, 73). The liquid level detection device according to claim 3, wherein a hole (71) is formed.
The switch mechanism (40) includes a switch body portion (43) extending along the axial direction (AD), and a connection portion protruding from the switch body portion (43) and connected to the transmission member (70). 41)
The connection part (41) is placed on the transmission member (70) by disposing the switch body part (43) between the pair of extending parts (72, 73). The liquid level detection device according to claim 3 or 4.
The said switch main-body part (43) contacts both of each said extending | stretching part (72, 73) by arrange | positioning between a pair of said extending | stretching parts (72, 73). The liquid level detection apparatus described in 1.