JPH02257020A - Float type liquid level gage - Google Patents

Abstract

PURPOSE:To obtain the compact liquid level gage which can adjust an operating liquid levels as desired by rotatably providing a float mounted with a magnet on a holder having a reed switch which can adjust an initial position. CONSTITUTION:The reed switch 3 which is a magneto-electric converting element is disposed in the upper part of the central part of an element holder 2 and is fixed by means of a male screw part 2b of a bolt and a nut 7 to an immobile part A of a tank wall, etc. On the other hand, the float 5 mounted with the permanent magnet 6 in the lower part is hung rotatably forward and backward to a fulcrum shaft 4 of the holder 2. The circuit of such constitution is turned on and the arrival of the prescribed liquid surface is detected when the float 5 rotates by receiving the buoyance of the liquid surface to be detected and the magnet 6 approaches the reel switch 3. The arbitrary adjustment of the liquid level to be detected is possible if the holder 2 is properly rotated to the right and left and is fixed by the nut 7 at this time.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a float-type liquid level gauge for detecting the height of liquid level in various tanks and the like.

[Conventional technology] Conventionally, conductivity of water, aqueous solution, water-soluble oil, etc. stored in tanks of boilers, water heaters, hot water heaters, solar heaters, coffee servers, vending machines, toilet showers, etc. Float type liquid level gauges for detecting the liquid level include those shown in FIGS. 6 to 8.

The liquid level gauge lO shown in FIG.
A rod 11 of arbitrary length is suspended and fixed via a nut 17 and a sealing O-ring 16, and a reed switch 12 is embedded from approximately the center to the slightly upper end, and a donut-shaped flow with a built-in permanent magnet 14 is installed. - 13 is fitted onto the rod 11 so that it can slide up and down.

Therefore, when the liquid level (LL+ rises and the permanent magnet 14 built into the float 13 approaches the reed switch 12, and a magnetic force above a certain level acts on the reed switch 12,
2 operates and outputs an electric signal, which is connected to the outside through a lead wire 18.

On the other hand, in the liquid level gauge 20 shown in FIGS. 7(a) and 7(b), a rod 21 containing a reed switch 22 is horizontally fixed to an arbitrary immovable wall surface 27, and near the periphery of the reed switch 22, A substantially rectangular parallelepiped float 23 having a built-in magnet 24 and a central hole 25 having a diameter sufficiently larger than the outer diameter of the rod 21 is loosely inserted therein. Further, stoppers 26 are provided on the rod 21 to restrict the range of lateral sliding of the float 23 near both ends of the reed switch 22.

Therefore, when the liquid level (LL) moves up and down, the float 23
moves up and down in the direction perpendicular to the rod 21 within the range of the gap between the central hole 25 and the outer diameter of the rod 21, and as a result, the reed switch 22 and the magnet 24 come into contact with each other, and the reed switch 22 moves in the same way as above. It has a structure that outputs an electrical signal when activated.

In addition, the liquid level gauge 30 shown in FIGS. 8(a) and 8(b) has a rod 3I with a built-in reed switch 32 horizontally fixed to an arbitrary immovable wall surface 36 in the same manner as described above, and a float 33
A magnet 34 is fixed to the upper surface of the magnet.

Then, the float 33 is placed against the immovable wall surface 36 so that the rod 31 is positioned below the reed switch 32.
It is connected to a support plate 35 fixed thereto via a connecting member 37 such as a chain or string. That is,
When the liquid level (LL) moves up and down, the float 33 comes into contact with and separates from the reed switch 32, and the reed switch 32 moves in the same way as above.
An electrical signal is output from the

[Problems to be Solved by the Invention] However, each of the float type level gauges described above requires the use of a considerably long rod, so the level gauge as a whole has to be large. Therefore, depending on the size of the tank, etc., it may not be possible to secure a space for the tank and use it.

In particular, the one shown in FIG. 6 requires a fairly long rod considering the distance from the immovable wall surface to the liquid level and the sliding range of the float.

In addition, it is preferable to make such a rod from plastic in terms of cost, but if the rod is long, for example, 100 mm or more, a problem arises in terms of strength, and it is necessary to use a welded metal pipe. This is extremely disadvantageous in terms of cost.

Furthermore, since each of these float-type liquid level gauges is fixed to a predetermined immovable part, the set position of the magnetic/electric conversion element is constant, and even if you try to change the operating water level, it will not change. Can not do it.

Therefore, the present invention solves the above-mentioned problems, is compact, can be installed even in a narrow installation space, and is capable of variably adjusting the operating water level of the magnetic-electric conversion element. The purpose is to provide.

[Means for Solving the Problems] The float type liquid level gauge of the present invention has a magnetic/electric transducer incorporated in a predetermined position in a liquid-tight manner, and can be rotated at any rotation angle with respect to the stationary part of the equipment to be installed. a plate-shaped element holder which can be removed with a handle and is provided so as to adjust the initial setting position of the magnetic-electric transducer; and a float having a built-in magnet, the plate surface of the element holder It is characterized by comprising a float rotatably suspended from a support shaft protruding from approximately the center.

(Example) Hereinafter, an explanation will be given based on an example of the present invention shown in FIGS. 1 to 5.

1 and 2 are a front view and a side view of this embodiment.

1 is a float type liquid level gauge according to this embodiment.

Reference numeral 2 denotes an element holder which houses a magneto-electric transducer (hereinafter referred to as "magneto-electric transducer") 3 in a predetermined position in a liquid-tight manner and is formed into, for example, a disk shape. This holder 2 is attached to a device to be attached, for example, to a vertical immovable part A such as a tank wall surface.
It can be installed and fixed at any rotation angle.

That is, as shown in FIG. 2, the element holder 2 is constructed by fitting a bolt part 2a protruding from the back surface of the element holder 2 into a vertical immovable part A such as a tank wall, and inserting a nut into this bolt part 2a. 7 are screwed together and attached to the stationary part A at a desired rotation angle.

At a position above the approximate center of the element holder 2,
A reed switch 3, which is a magnetoelectric transducer, is disposed inside the reed switch 3. Note that 3a is a lead wire for the magnetoelectric conversion element 3.

Therefore, when the operating water level is to be set at the highest level, the element holder 2 may be rotated and initially set to a position substantially parallel to the liquid level, as shown in FIG. On the other hand, if you want to lower the operating water level below this level, rotate the element holder 2 to the left or right within an appropriate range and tighten the nut 7 to fix the element holder 2 to the initial setting height of the magnetoelectric transducer 3. All you have to do is lower it.

For example, 5 is a float made of plastic material molded into a substantially pentagonal flat plate shape as shown in the drawing. It is suspended and supported on a shaft 4 so as to be rotatable in forward and reverse directions. That is, the float 5 is suspended and supported by the element holder 2 by inserting a shaft hole eccentrically drilled near the upper head portion of the float 5 into the support shaft 4 .

Note that this float, like the float 5' shown in FIG.
It is also possible to use a plate that is formed into a plate surface shape that is asymmetrical with respect to the center of gravity when it is allowed to hang down naturally. In this way, when receiving the buoyant force of the detection liquid surface, the float 5'
The rotation (especially the initial movement from a vertically hanging state) can be easily performed, and the direction of rotation can be fixed in both the forward and reverse directions with respect to the rise or fall of the liquid level. Furthermore, a stopper 8 may be provided protrudingly at an appropriate position on the holder 2 in order to restrict the rotation range of the float 5'.

Due to this, when the liquid level rises, the float 5' rotates only in the direction of the solid line arrow P, and when the rotating end of the float 5' comes into contact with the stopper 8, the rotation stops, while when the liquid level falls, it rotates only in the direction of the solid line arrow P. It will only rotate in the opposite direction.

6 is a permanent magnet disposed inside the float 5. It is preferable to dispose it at a lower part of the float 5 substantially parallel to the liquid level.

The float type liquid level gauge of this embodiment having such a configuration operates as follows. This will be explained based on FIGS. 3 and 4.

First, when the liquid level is at a height (Ll) at which it does not come into contact with the float, the two floats 5 are in a state of naturally hanging down from the support shaft 4, as shown in FIG. 3(a), and at this time, The signal state of the magnetoelectric transducer 3 is OFF.

On the other hand, when the liquid level rises to a height (Ll) near the center of the support shaft 4, as shown in FIG. 3(b), the float 5 becomes
Under the influence of buoyancy, the magnet 6 rotates about the support shaft 4 in the direction of the solid arrow P, for example, so that the opposing plate surfaces of the holder 2 and the float 5 rub against each other until the magnet 6 is perpendicular to the liquid surface.

Then, the liquid level further increases to the height (L3) shown in Figure 3 (C).
When the float 5 further rotates, the float 5 rises and the magnet 6 approaches the magnetoelectric conversion element 3, so that the circuit becomes O
N is given. At this time, it is detected that the liquid level has reached (L3).

Next, as the liquid level falls from this state, the float 5 rotates in the opposite direction to the above, so the magnet 6 separates from the magnetoelectric conversion element 3, and is no longer affected by the magnetic force, turning the circuit OFF. Become.

On the other hand, as shown in Fig. 4, the liquid level height is as described above (L3
), for example, (L3'), first move the element holder 2 to the dotted line arrow Q.
By rotating and fixing the magnetoelectric transducer 3 by a predetermined angle in the direction, the initial setting position of the magnetoelectric transducer 3 is lowered than in the above case.

Therefore, as shown in Fig. 4(b), the liquid level height is (Ll).
When the float 5 reaches the same as above, the float 5 rotates in the direction of the solid arrow P until the magnet 6 is perpendicular to the liquid level. L3'
), the circuit is turned on. Therefore, the operating water level of the magnetoelectric conversion element 3 can be lowered than in the above case.

[Effects of the Invention] The float-type liquid level gauge of the present invention is provided with a float containing a magnet so as to be rotatable relative to a holder containing a magneto-electric transducer, so a conventional rod cannot be used. It is more compact than previous liquid level gauges and can be applied to a variety of fields. Moreover, since it is compact, there is no need to worry about its strength even if it is molded from plastic material.

Moreover, since the element holder itself containing the magneto-electric transducer can be set at any rotation angle relative to the stationary part, the operating water level of the magneto-electric transducer can be selectively adjusted as desired, and the mounting location of the element holder can be adjusted as desired. There is no need to move up and down. Therefore, its practical value is extremely great.

[Brief explanation of drawings]

Fig. 1 is a front view showing an embodiment of a float type liquid level gauge according to the present invention, Fig. 2 is a side view of the same, and Figs. 3 (a) to (c).
and FIGS. 4(a) to (c) are explanations showing the operating state thereof,
FIG. 5 is a front view of a liquid level gauge using another embodiment of a float;
Figure 6 is a front view showing a conventional float type liquid level gauge, Figures 7 (a) and (b) are front and side views showing another conventional float type liquid level gauge, and Figure 8 (a) and (b) are a front view and a side view showing still another conventional float type liquid level gauge. 1.10, 20.30...Flow-1~ type liquid level gauge 2...Magnetoelectric conversion element holder 2a...Port part 2b...Port 1~Male thread part 3.12, 22.32...Magnetoelectric conversion element 4...
...Spindle 5.5', 13, 23.33...Float 6
．． 14,24.34...Permanent magnet 7...
・Nut 8... Stopper 11.21.31... Rod

Claims (2)

[Claims] (1) The magnetic/electrical conversion element is liquid-tightly built into a predetermined position, and can be attached at any rotation angle to a stationary part of the equipment to be installed, and the initial setting position of the magnetic/electrical conversion element is a plate-shaped element holder provided so as to be able to adjust the temperature of the element holder, and a float having a built-in magnet, which is freely rotatably suspended from a support shaft protruding from substantially the center of the plate surface of the element holder. A float type liquid level gauge characterized by the following. (2) When the float naturally hangs down on the support shaft, it is formed into a plate surface shape that is asymmetrical with respect to the center of gravity, and the forward and reverse rotation directions of the float as the liquid level moves up and down are constant. A float type liquid level gauge according to claim 1.