JPH0590331U - Float type level sensor - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a float type level sensor in which, when used in a liquid containing foreign matter, malfunctions caused by clogging of the foreign matter between the stem and the float are improved. [Structure] A float type level sensor having the following structures. A structure where the cover is attached to the outside of the float and the stem and the float do not touch the liquid, the structure where only the extension part of the float that extends downward touches the liquid, the stem is covered with a cover equipped with a magnet that moves up and down along the stem,
A structure in which a float is attached to the cover, a structure in which the float and the stem are covered with a filter, a structure in which the above sensor is mounted upside down, a magnet is fixed above the liquid surface, and the magnet is vertically moved. A structure in which a float is attached to the lower end of the moving stem, and a float for detecting the liquid level is separately provided, and it is linked with a magnet by remote control.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a float type level sensor.

[0002]

[Prior Art]

 Conventionally, a float type level sensor as shown in FIGS. 8A and 8B is used as a sensor for detecting the liquid level (level) in the container. FIG. 8 (A) is a partially cutaway perspective view of the float type level sensor, and FIG. 8 (B) is a schematic view showing a state in which the float type level sensor is attached, and shows only a cross section of the float portion. As shown in the figure, in the float type level sensor 1, a columnar stem 4 projects from the main body mounting portion 2, and a reed switch 5 is fixedly sealed inside the system 4. A float that can freely move up and down along the stem 4 is provided, and a magnet 7 is provided inside the float 6. When the float 6 rises and falls due to the rise and fall of the liquid level, the distance between the magnet 7 and the reed switch 5 changes relatively, and the reed switch turns on and off. 3 is a mounting nut, 8 is a lead wire, 9 is a suction preventing protrusion, 10 is a stopper, L is a liquid for detecting the liquid surface, and P is a plate to which the float type level sensor 1 is mounted.

[0003]

[Problems to be solved by the device]

 However, the conventional float type level sensor is apt to cause malfunction of the float when used for a liquid containing a large amount of foreign matter. Therefore, an object of the present invention is to provide a float type level sensor which does not cause malfunction even when used in a liquid containing a large amount of foreign matter.

[0004]

[Means for Solving the Problems]

 The present invention which achieves the above-mentioned object of the present invention is as follows.

A float type level sensor, wherein a cover having a structure for covering the float and the stem portion is attached to the float.

A float type level sensor characterized in that the float is extended downward so that only the extension is in contact with the liquid.

A float-type level sensor characterized in that the stem is covered with a cover that moves up and down along the stem, and a float is attached to the cover.

A float type level sensor characterized in that the float and the stem are covered with a cover having a filter.

A float type level sensor, wherein the float is attached so as to be higher than the attaching portion, and a cover having a structure for covering the float and the stem is attached to the float.

A float type level sensor characterized in that a float is attached to the lower end of a stem that moves up and down along with a fixed magnet.

A float type level sensor characterized in that a float for detecting a liquid surface is used separately from a float having a built-in magnet, and both are interlocked by using a connecting means.

[0012]

[Function of the device]

 With the above configuration, foreign matter existing in the liquid for detecting the liquid surface is prevented from entering the gap between the stem and the float, so that even if foreign matter is present in the liquid, the foreign matter will not enter the gap. Since it does not clog, there is no malfunction due to this clog.

[0013]

【Example】

 Hereinafter, the present invention will be described with reference to the drawings. The following drawings are schematic sectional views of an embodiment of the float type level sensor of the present invention. In the drawing, only the main part is shown in cross section.

FIG. 1 is a view showing a first embodiment of a float type level sensor of the present invention. In this embodiment, the float type level sensor 11 is provided with a cover 12 for covering the stem 4 and the float 6. The cover 12 has a structure in which a bottom side is closed and a cylindrical side inner wall whose upper surface is open is joined to the side surface of the float 6, so that the liquid L for detecting the liquid level is prevented from entering the space between the stem 4 and the float 6. It has a structure to eliminate.

If the cover 12 has a detachable structure, the liquid level can be adjusted by changing the length of the cover without changing the mounting position of the main body. Further, the float and the cover may be integrally molded. Furthermore, it is possible to adjust the buoyancy by putting a weight in the cover. The shape and the like of the cover 12 are arbitrary as long as the object of the present invention is achieved.

FIG. 2 is a view showing a second embodiment of the float type level sensor of the present invention. In this embodiment, the float type level sensor 21 extends the float 6 downward, and only the extended portion 6a touches the liquid L. If the extension is made removable, the liquid level can be adjusted by changing the length of the extension without changing the mounting position of the main unit. Further, the float and the extension may be integrally molded. The buoyancy can be adjusted by changing the specific gravity of the extension (changing the material, providing weights and cavities inside, etc.). The shape and the like of the extension portion 6a are arbitrary as long as the object of the present invention is achieved.

FIG. 3 is a view showing a third embodiment of the float type level sensor of the present invention. The float type level sensor 31 of this embodiment covers the stem 4 with a cylindrical cover 32 that moves up and down along the stem 4 and has a bottom that covers the bottom of the cover 32. It has a structure with attached. With such a structure, the presence of the liquid L between the magnet 7 and the stem 4 can be eliminated. Also in this case, the shape and the like of the cover 32 are arbitrary as long as the object of the present invention is achieved.

FIG. 4 is a view showing a fourth embodiment of the float type level sensor of the present invention. In the float type level sensor 41 of this embodiment, the stem 4 and the float 6 are covered with a cover 42 having a filter 42a which allows the liquid L to pass but does not allow foreign matters therein to pass. Has the same structure.

FIG. 5 is a view showing a fifth embodiment of the float type level sensor of the present invention. The float type level sensor 51 of this embodiment has a structure in which the float 6 is mounted so as to be higher than the mounting portion 2, and a cover 52 having a structure for covering the stem 4 and the float 6 is mounted on the float 6. .. It is preferable that the lower portion of the cover 52 is tapered as shown in the drawing, because air inside does not leak when it is inclined. The shape and the like of the cover 52 are arbitrary as long as the object of the present invention is achieved.

FIG. 6 is a view showing a sixth embodiment of the float type level sensor of the present invention. The float type level sensor 61 of this embodiment has a structure in which a float 63 is attached to the lower end of a stem 62 (having a built-in reed switch) that moves up and down along a fixed magnet 7. 64 is a guide member for the stem 62.

FIG. 7 is a side view showing the configuration of a seventh embodiment of the float type level sensor of the present invention. The float type level sensor 71 of this embodiment remotely controls the float 6 having the magnet 7 incorporated therein. A float 72 for liquid level detection is used separately from the float 6 having the magnet 7 incorporated therein, and a float 73 is provided for both. It has a structure that is linked and linked by a thread 74. The connecting means may be a lever or the like.

[0022]

[Effect of the device]

 According to the present invention, there is provided a float type level sensor which does not cause malfunction even when used in a liquid containing a large amount of foreign matter. Further, by using the conventional float type level sensor, a means for improving malfunction of the float when used for a liquid containing a large amount of foreign matter is provided.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view showing a first embodiment of the present invention.

FIG. 2 is a schematic sectional view showing a second embodiment of the present invention.

FIG. 3 is a schematic sectional view showing a third embodiment of the present invention.

FIG. 4 is a schematic cross-sectional view showing a fourth embodiment of the present invention.

FIG. 5 is a schematic sectional view showing a fifth embodiment of the present invention.

FIG. 6 is a schematic sectional view showing a sixth embodiment of the present invention.

FIG. 7 is a schematic sectional view showing a seventh embodiment of the present invention.

FIG. 8A is a partially cutaway perspective view showing a conventional float type level sensor. (B) is a schematic view showing a usage state of a conventional float type level sensor.

[Explanation of symbols]

1, 11, 21, 31, 41, 51, 61, 71 Float type level sensor 4, 62 Stem 6, 6a, 33, 63, 72 Float 12, 32, 42, 52 Cover 42a Filter

Claims (7)

[Scope of utility model registration request] 1. A float type level sensor, wherein a cover having a structure for covering the float and the stem is attached to the float. 2. A float type level sensor characterized in that the float is extended downward so that only the extension portion comes into contact with the liquid. 3. A float type level sensor, characterized in that the stem is covered with a cover that moves up and down along the stem, and a float is attached to the cover. 4. A float type level sensor characterized in that the float and the stem are covered with a cover having a filter. 5. A float type level sensor, wherein the float is attached so as to be higher than the attaching portion, and a cover having a structure for covering the float and the stem is attached to the float. 6. A float type level sensor, wherein a float is attached to a lower end of a stem which moves up and down along a fixed magnet. 7. A float type level sensor characterized in that a float for liquid level detection is used separately from the float having a built-in magnet, and both are interlocked using a connecting means.