JPS6015139Y2 - Float type liquid level gauge - Google Patents

Description

[Detailed description of the invention] This invention relates to a float-type liquid level gauge, and its purpose is to prevent the float from moving up and down smoothly due to water stains stored in a tank. That is.

A float-type liquid level structure in which a reed switch is embedded in a linear column-shaped main body, and a permanent magnet piece is attached to a float that is attached to the main body so as to be able to move up and down to turn the reed switch on and off. This gauge is currently used as the mainstream liquid level gauge.

This float-type liquid level gauge that uses a reed switch does not display changes in the amount of liquid in the tank according to the changes, but rather indicates when the liquid in the tank is full or when liquid is flowing into the tank. The main purpose of the operation is to notify when the amount has fallen below a predetermined value, so the float, which is loosely fitted to the main body and can slide freely in the length direction of the main body, is activated by the fixed permanent magnet piece. Since it is only necessary to slide the distance to turn on and off the reed switch, the amount of movement is small and the structure is simple and good, and it has the advantages of being inexpensive, exhibiting relatively high accuracy, and being easy to handle. Ta.

However, in order to set the position of the float that turns on the reed switch as accurately as possible, the combination must be such that there is almost no gap between the main body and the float, and there is no wobbling. Because the float must move up and down relative to the main body to a certain extent in order to turn on and off the reed switch with one piece, the combination structure that allows the float to slide freely relative to the main body requires relatively high precision. It had become a thing.

By the way, conventional float-type liquid level gauges using reed switches have a structure in which a permanent magnet piece is attached directly to the float, so the main body is always submerged in the liquid in the tank.

For this reason, the surface of the main body submerged in the liquid will have adhering substances such as water scale, and this adhesion may make it difficult to move the float up and down relative to the main body, and in some cases, the float may not be able to move up and down the main body. There has been an inconvenience in that the float cannot be moved up and down relative to the level gauge, making it impossible to perform the desired operation as a level gauge.

The present invention was devised in order to eliminate the drawbacks of the above-mentioned conventional example. A slide tube with a permanent magnet piece fixed to it is slidably assembled to a main body in which a reed switch is embedded, and legs are suspended from the slide tube. It consists of a float fixed to the lower end of the piece.

An embodiment of the present invention will be described below with reference to the drawings.

In the figure, reference numeral 1 denotes a main body in the shape of a straight column, and a stem 3 is integrally installed in the upper end of the main body 1 in the form of a flange, and a tightening nut 4 is attached to the upper end to form a liquid level gauge according to the present invention. A portion to be assembled to the top wall of the tank 11 is formed.

That is, in the case of the illustrated embodiment, when assembling a hole in the top wall of the tank 11, the upper end of the main body 1 is inserted into the hole from inside the tank 11 until the stem 3 comes into contact with the stem 3, and then the stem 3 protrudes from the top wall of the tank 11. The nut 4 is screwed onto the upper end of the main body 1, and the top wall of the tank 11 is tightened between the stem 3 and the main body 1 is fixed in a hanging position on the top wall of the tank 11. It has become.

At the lower end of this main body 1, a main body 1 of a slide cylinder 7, which will be described later, is attached.
A locking ring 6 is fixed to prevent it from being pulled out.

Further, a reed switch 2 is embedded and fixed in an upright position in a portion of the main body 1 at an appropriate height, and a lead wire 5 of the reed switch 2 is led out from the upper end of the main body 1.

The fixed height position of the reed switch 2 on the main body 1 is set as necessary depending on the intended use of the liquid level gauge, but it is generally used for the purpose of detecting the liquid level when the water is full. In this case, it is preferable to place the liquid at a slightly higher level, and conversely, when the liquid in the tank 1 is used for the purpose of detecting that the amount of liquid has fallen below a predetermined amount, it is preferable to place it at a lower position.

A slide tube 7 is fitted and assembled into the main body 1 so as to be slidable in the height direction of the main body 1, that is, to be able to move up and down without any backlash. The permanent magnet piece 8 for turning on and off the switch 2 faces the main body 1, that is, its magnetic pole face is flush with the inner circumferential surface of the slide tube 7 or is lower than the inner circumferential surface of the slide tube 7. Fixed position slightly set back.

From the lower end of this slide tube 7, legs 9 (in the case of the illustrated embodiment, three legs at equal intervals) are provided which are sufficiently longer than the main body 1 and are in a form that does not impede the vertical movement of the slide tube 7 relative to the main body 1. A float 1 is installed at the lower end of this leg piece 9.
0 is fixed.

The length of this leg piece 9 is set according to the purpose of use of this liquid level gauge, similar to the setting of the mounting position of the above-mentioned reed switch 2 on the main body 1.

That is, when used for the purpose of detecting the state of full water, the leg piece 9 is only slightly longer than the main body 1, and the permanent magnet piece 8 fixed to the slide tube 7 acts as a reed switch. 2, the length is such that the float 10 fixed to the lower end of the leg piece 9 is located slightly below the lower end of the main body 1 when the reed switch 2 is moved upward to the position where the reed switch 2 is turned on or off. On the other hand, when the liquid level in the tank 11 is set to 1 and is used for the purpose of detecting that the liquid level in the tank 11 has fallen below a predetermined amount, the leg piece 9 is set to be much longer than the main body 1. The length is set such that when the permanent magnet 8 moves downward to the position where the reed switch 2 is turned on or off, the float 10 is located near the bottom of the tank 11.

As described above, the liquid level gauge according to the present invention is used to detect whether the liquid in the tank 11 is full or, conversely, to detect when the amount of liquid in the tank 11 has fallen below a predetermined value. What is used for is simply the length of the leg piece 9 and the body 1
The installation of the reed switch 2 in the interior is changed depending on the position, and the dimensions of the main body 1 itself do not change. Regardless of the purpose of use, the length of the reed switch 2 can be set appropriately on the main body 1. Then, the main body 1 does not need to be submerged in the liquid in the tank 11 at all, and can always be located above and away from the liquid in the tank 11 regardless of changes in the amount of liquid in the tank 11. be.

In this way, the main body 1 is never immersed in the liquid in the tank 11, so there is no possibility that water stains or other deposits will form on the outer peripheral surface of the main body 1. The sliding movement of the slide tube 7 remains smooth forever.

By the way, as is well known, the on/off control of the reed switch 2 by the permanent magnet piece 8 requires the position of the permanent magnet piece 8 to turn on the reed switch 2 due to the hysteresis characteristic of both contact pieces of the reed switch 2. There is a certain distance difference between the position of the permanent magnet piece 8 and the position of the permanent magnet piece 8 that turns off the reed switch 2.

Therefore, in a detection mechanism using this type of reed switch 2, the permanent magnet piece 8 is larger than the distance determined by the hysteresis characteristic of the reed switch 2 described above.
However, the length of the portion of the main body 1 over which the slide tube 7 can slide must be made in accordance with the hysteresis characteristics of the reed switch 2 described above. If the distance is sufficiently larger than twice the distance, the length of the leg piece 9 can be reduced by arranging the reed switch 2 approximately in the center of the part of the main body 1 where the slide tube 7 can slide. By simply setting , the same main body 1 can be used both for detecting full water and for detecting that the water has fallen below a predetermined value.

In addition, the locking ring 6 provided at the lower end of the main body 1 is attached to the main body 1.
By making it detachable as a separate object, the combination of the slide tube 7 and float 10 and the main body 1 can be freely replaced.

As is clear from the above explanation, the liquid level gauge according to the present invention is
Since the main body 1 to which the reed switch 2 is fixed is not immersed in the liquid in the tank 11, there is no possibility of adhesion such as water stains on the outer circumferential surface of the main body 1. There is no possibility of any trouble in sliding, and smooth detection operation can always be obtained.Furthermore, a leg piece 9 is provided on the slide tube 7, and a float 1 is attached to the lower end of this leg piece 9.
Since it has a simple structure in which 0 is fixed, it is easy to manufacture and can be manufactured at low cost.Furthermore, the same main body 1 can be used for different purposes by simply changing the combination of the slide tube 7 and the float 10 to the main body 1. This is a float-type liquid level gauge that utilizes an easy-to-use reed switch and has many excellent functions and effects.

[Brief explanation of the drawing]

FIG. 1 is a partial vertical cross-sectional view with main parts broken away. FIG. 2 is an external side view. Explanation of symbols, 1: Main body, 2: Reed switch, 3: Stem, 4: Tightening nut, 5: Lead wire, 6: Locking ring, 7: Slide tube, 8: Permanent magnet piece, 9: Leg piece , 10:
Float, 11: Tank.

Claims (1)

[Scope of utility model registration request] The tank 11 has a section at the upper end for attachment to the upper wall, and the lower end has a locking ring 6 to prevent it from being pulled out, and the lead wire 5 of the reed switch 2 fixed inside is led out from the upper end. A slide tube 7 is attached to the main body 1 so as to be slidable along the length direction of the main body 1, and a permanent magnet piece 8 is attached to the slide tube 7 in a position facing the main body 1. A float type liquid level gauge in which a leg piece 9 that is sufficiently longer than the main body 1 is hung from the lower end, and a float 10 is fixed to the lower end of the leg piece 9.