JPH0359369B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention prevents bending fatigue of the wire or tape suspending the displacer due to rapid changes in the liquid level of a liquid level sensing body such as a dispenser sheath float. The present invention relates to a self-balancing liquid level gauge configured to improve the ability of a day suppressor to follow liquid level fluctuations.

Figure 1 shows the configuration of a conventional self-balancing liquid level gauge.

The displacer 2 is arranged at a position where it floats on the liquid level 1. A tape or wire 13 is connected to the diskette sensor 2, and this tape or wire 13 is wound around a take-up pulley via pulleys 3, 14 and a sprocket pulley 12, and 10 in the figure indicates a motor for driving the take-up pulley. . The pulley 3 is arranged vertically above the displacer 2 and is attached near the middle position of the balancer bar 6a, which is indicated by the fulcrum 4 and the spring 5. The balancer bar 6a has a first
As shown in the figure, a vertical rod 6b facing the side of the detection element 7 is disposed, and changes in the buoyancy of the displacer 2 prompt the movement of the rod 6b, thereby giving a displacement signal of an electric value to the detection element 7. become. The displacement signal from the detection element 7 is sent to an amplifier (AMP), where it is amplified and rotates the motor 10 by the amount of the displacement signal. Since the motor 10 is directly connected to the take-up pulley as described above, the tape or wire 13 is wound up by the amount of the displacement signal, so that the change in buoyancy of the displacer 2 is corrected and adjusted to maintain the original equilibrium position. be done. However, as shown in Fig. 2, when waves are generated on the liquid surface and the displacer 2 is suddenly lifted upward,
Since the rotation of the motor 10 cannot follow this rotation and the winding of the tape or wire 13 is delayed, the tape or wire 13 becomes slack as shown in the figure.
Generally a tape or wire 1 by said motor 10
The maximum winding and unwinding speed of No. 3 is 500 to 1,500 mm per second, but it cannot follow the rapid changes in the liquid level as described above, so the tape or wire 13 is bent, and then gradually Winding is performed to balance the displacer 2. Therefore, it takes time for the displacer 2 to return to an equilibrium state, and the tape or wire 13 becomes fatigued due to repeated bending, resulting in fatigue failure.

The present invention has been made in order to eliminate the above-mentioned drawbacks, and its purpose is to be able to follow sudden changes in the liquid level and to give bending to the tape or wire suspending the displacer. Our objective is to provide a self-balancing liquid level gauge that is safe and reliable.

In order to achieve the above object, the present invention includes a spring pulley integrated with a take-up pulley, and a constant output spring wound around the spring pulley, and wherein the spring pulley and the take-up pulley are connected to each other. It has become possible to provide a self-balancing liquid level gauge configured to be connected to a motor via a clutch device.

Embodiments of the present invention are shown in FIGS. 3, 4, and 5 below.
This will be explained based on the diagram. In these figures, the same reference numerals as in FIGS. 1 and 2 are shown in FIG.
The same components as in FIG. 2 are shown.

The take-up pulley 20 and the spring pulley 21 are integrated by a connecting rod 28. Take-up pulley 2
Tape 1 is connected to sprocket pulley 12 through sprocket pulley 12.
3 is wound. The other end 256 of a constant output coil spring 25 whose one end 25a is fixed to the fixed shaft 23 is fixed to the spring pulley 21, and the rotational force in the same direction as the tape winding direction of the take-up pulley 20 is applied. Therefore, the tape winding force is always applied to the winding pulley 20 which is integral with the spring pulley. Motor 10 in FIG.
A drive shaft 27 directly connected to the winding pulley 20 and the spring pulley 21 loosely passes through center holes 20a and 21a, and a ratchet wheel 22 for a one-way clutch is firmly fitted to the tip thereof. The teeth of this ratchet 22 are connected to the spring pulley 2.
1, a one-way clutch pawl 24 is attached to the shaft 24a with a spring 26 giving a rotation return force in one direction, and the spring pulley 21 is connected to the take-up pulley in the tape winding direction. can rotate freely relative to the ratchet wheel, but
In the reverse case, the spring pulley 21 and the ratchet wheel 22 rotate as one unit. Therefore, in addition to being rotated by the motor in the tape winding direction, the spring pulley and the take-up pulley are also rotated independently in the tape winding direction by the Conston spring when the tension of the tape 13 decreases. It is becoming more and more popular.

In the embodiment, the spring pulley 21 and the take-up pulley 20 are constructed as separate parts, and are connected together with a pin 28, but there are cases where both are formed integrally from the beginning. . Further, the spring pulley 21 is not necessarily necessary, and the winding force may be applied to the take-up pulley by the Conston spring. In some cases, the structure is such that it only engages with an upright pin, etc.). In this case, the ratchet pawl is attached directly to the take-up pulley.

Since the device of the present invention has the above-described structure, when the liquid level rises slowly, the detection element 7
The motor 10 is driven in the winding direction by a displacement signal from the motor 10, and the ratchet wheel rotates the take-up pulley 20 with the ratchet wheel 22 engaged with the pawl 24, and the take-up pulley winds the tape until a predetermined tension is reached. . When the liquid level falls, the tension in the tape increases;
This increased tension causes the take-up pulley 20 to unwind and rotate. At this time, the motor is not driven, but the drive shaft 22 is freely rotated by the unwinding rotational force of the take-up pulley. When the liquid level rises rapidly, but not too much, due to the formation of waves, etc., as the tape loosens, the take-up pulley 20 is rotated in the tape winding direction by the elasticity of the Conston spring 25. , the same pulley winds the tape until the tension of the tape reaches a predetermined value, that is, until the sputtering of the dispressor reaches a predetermined value. Furthermore, when the liquid level drops, the take-up pulley unwinds the tape as described above. Therefore, according to the present invention, even in the case of a sudden but not large change in the liquid level, the tape hardly bends, is always kept under tension close to a predetermined value, and does not repeatedly bend and stretch. This has the advantage that not only can fatigue of the tape be prevented and the life of the tape can be extended, but also frequent turning on and off of the motor can be prevented and the life of the motor can be extended.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram showing a conventional self-balancing liquid level gauge, and FIG. 2 is a state diagram illustrating the operating state of the dispressor when a sudden change in the liquid level occurs.
FIG. 3 is a schematic diagram showing one embodiment of the present invention, and FIG.
The figure is a partial front view of the device of the present invention, and FIG. 5 is a V-V
FIG. In the figure, 2...liquid level sensing body, 3...pulley, 4...
Fulcrum, 5... Spring, 6a... Balance bar, 6b... Rod, 7... Detection element, 8... Magnifier, 9... Power supply, 10... Motor, 20... Winding pulley, 12... ...Sprocket pulley, 13...
...Tape, 21...Spring pulley, 22...
Ratchet wheel, 23... Rotating shaft, 24... Ratchet pawl, 25... Constant output spring, 26... Spring, 27... Motor shaft, 28... Connecting rod.

Claims (1)

[Claims] 1. An elastic body applies rotational force in the cable winding direction to a take-up pulley that winds and rewinds the cable that suspends the liquid level sensing body above the liquid surface with a predetermined level of water, and the central hole of the take-up pulley is A drive shaft rotated by a motor is loosely inserted into the drive shaft, and the drive shaft and take-up pulley are connected to each other. The cable tensioning device for the self-balancing liquid level gauge is connected by a one-way clutch that rotates the drive shaft as one unit.