JPH0342339Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field The present invention relates to the structure of a float in a liquid level gauge that uses the length of the float's hanging cable to read the liquid level position.

(b) Prior art and its problems The larger the float, the more accurately the liquid level position can be read, but the float insertion opening in the tank is often small, and therefore rod-shaped floats are often used. When pulling up this float from the tank, the float is pulled up vertically because the float insertion port is small, but in this case, a measurement wire or tape connected to the float is used to pull it up. However, when pulled up using this method, the load of the float is applied directly to the wire or tape for measuring the liquid level, causing the wire to stretch, which causes an error when the float is put back into the tank and measures the liquid level, making it impossible to measure accurately. Since it disappeared, I had to readjust it.

(c) Structure and operation to solve the problem Therefore, in the present invention, a rod body for guiding (for preventing flow of the float) is suspended from the main body of the level gauge, and a rod-shaped float is inserted into this rod body through a sleeve. At the same time, the sleeve and the tip of the float were connected with a wire, and when the rod body was pulled up, the sleeve remained on the rod side, and the sleeve and float were separated, so by loosening the measurement wire and pulling it up together with the rod body. The float can be pulled out by pulling out the rod without applying tension to the measuring wire.

(d) Example In the figure, 28 is an underground tank, 22 is a manhole in which the liquid level gauge body 20 is housed, and 24 is a manhole cover. Reference numeral 26 denotes an insertion port of the tank into which the rod body 6 and the rod-shaped float 4, which are suspended by the liquid level gauge body 20 and have a non-circular cross section (here, a rectangular shape is adopted), are inserted. A stopper 16 that is slightly larger than the cross section of the rod body is fixed to the lower end of the rod body 6 hanging from the liquid level gauge main body 20. Reference numeral 2 denotes a cylinder that can be detached from a through hole 40 formed at approximately the center in the length direction of the float 4 to which the tip of a wire 10, which is a first cable hanging from the level gauge main body 20, is fixed. As shown in FIG. 4, this sleeve 2 has elastic springs 14 protruding outwardly on each opposing surface. The spring 14 may be molded integrally with the sleeve 2 using resin or the like, but the spring 14 may also be made separately and fixed to the sleeve 2. The sleeve 2 is engaged with the float by this spring 14. The sleeve 2 and the float 4 are each provided with a recess 12 which should enable rotation in the vertical direction as shown in FIG. 6 when the two are in a mated state. Reference numeral 8 denotes a wire corresponding to a second cable fixed to the upper end of the sleeve and one end of the float, respectively.

To explain in the above configuration, first, when arranging the liquid level gauge main body 20, the float 4 and the sleeve 2
are engaged, the wire 10 is let out from the level gauge body, the float 4 is rotated, and the rod body 6 is placed in the recess 12 of the float 4. In this state, as shown in FIG. Insert body 6. When the float 4 comes into contact with the liquid level in the underground tank 28, it automatically becomes horizontal due to buoyancy, and the wire 10
Since a pulling force is always acting on the float 4, if the wire 10 is left in a free state, the float 4 will maintain balance on the liquid surface, and the liquid level can be measured from the length of the wire 10 at this time.

Next, when lifting the float 4 from the underground tank 28, as the rod body 6 is pulled up together with the liquid level gauge main body 20, when the stopper 16 is raised above the liquid level, the sleeve 2, the float 4,
is stopped by the stopper 16, and the float continues to rise horizontally. When the rod body 6 is further pulled up and the float 4 hits the bottom of the insertion port 26 of the underground tank 28, the wire 10 is loosened.If the rod body 6 is further pulled up in this state, the float 4 is located at the bottom of the insertion port 26. Since the force of the spring 14 that locks the float 4 and the sleeve 2 cannot resist this, the two separate, resulting in a situation as shown in FIG. At this time, since the wire 10 is loosened, the float 4 falls, but the wire 8 stops the float 4 from falling, and the float 4 is suspended vertically. When the rod body 6 is pulled up in this state, the weight of the float 4 is supported by the wire 8, and no tension is applied to the wire 10.

(E) Effect With the above configuration, even if the float gets stuck at the lower end of the insertion port when the float is pulled out from the insertion port, the float can be pulled up without applying excessive tension to the measurement wire, making measurement possible. There is no risk of the wire being stretched,
Therefore, there is no need to readjust the level gauge when putting it back into the float and underground tank, and it can be used with the same accuracy as before.

[Brief explanation of the drawing]

Figure 1 is a diagram of the float and sleeve in a mated state, Figure 2 is a diagram of the float and sleeve separated, Figure 3 is a sectional view taken along line A-A in Figure 1, and Figure 4 is a perspective view of the sleeve. Figure 5 is a reference diagram when a level gauge is installed in an underground tank, and Figure 6 is a diagram showing a state in which the float and sleeve are inserted into the insertion port in a mated state. 2... Sleeve, 4... Float, 6... Rod body, 8... Wire, 10... Wire, 12... Float recess, 14... Spring, 16... Stopper.

Claims (1)

[Scope of utility model registration request] A level gauge body installed at the top of the tank, a rod body that extends and hangs from this body and has a stopper fixed at its lower end that is larger than its horizontal cross section, a rod-shaped float, and a roughly central part in the length direction of the float. a cylindrical sleeve that removably engages with the through hole, has a protrusion on its outer peripheral surface for engagement with the through hole, and has an opening through which the rod body is inserted; It consists of a first cable that hangs from the face meter body and suspends the float, and a second cable that connects the sleeve and the tip of the float, and the stopper is larger than the opening size of the sleeve and smaller than the external dimension. The sleeve has a rod body entry recess that allows the float to rotate in a vertical plane when the sleeve and float are in a mated state and the rod body is inserted into the opening of the sleeve. The float structure of the liquid level gauge is characterized by being provided over the entire length of the float, including the float.