JPS62150122A - Apparatus for detecting liquid level - Google Patents

Abstract

PURPOSE:To prevent the variation of the indication of a meter due to the effect of a road surface state or a driving state, by forming two chambers to a housing surrounding a float arm, a float and a float arm pivot part and providing the piercing hole to the housing so as to communicate the inside and outside thereof. CONSTITUTION:When the surface of the liquid in a tank 4 changes, a float 12 moves up and down in a first curved chamber 14 and a float arm 15 revolves around a rotary shaft 24 with the movement of the float 12 within the range limited by the float arm 15 in a second fan-shaped chamber 17. By this method, the rotary shaft 24 integrally connected to the base end side of the float arm 15 through a connection member 15 revolves and the change in the surface of the liquid is detected as the change in an electric resistance value by the action of a potentiometer 21. Because the change in the surface of the liquid in the tank 4 is timewise relaxed by small piercing holes provided to the upper and lower parts of a housing 7, the variation of the indication of a meter due to the effect of a road surface state or a driving state is well prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an arm float type liquid level detection device for measuring the amount of liquid in a tank such as a military tank.

[Related technologies and problems]

In the conventional liquid level detection device of this kind, the liquid level detector body is attached via a gasket to the opening at the upper end of a tank that stores liquid such as fuel, and the proximal end of the float arm is attached to the liquid level detector body. The float arm is rotatably supported within the range regulated by the stop and brim, and a float that floats on the liquid surface and moves up and down to follow changes in the liquid level is disposed on the tip side of the float arm. A detection actuation section that responds to the rotation of the float arm due to the vertical movement of the float is provided on the base end side of the float, and the up and down movement of the float is electrically converted into the liquid level detector body via the detection actuation section. A detection section is provided,
The float moves up and down directly in response to changes in the liquid level in the tank.
Accordingly, the float arm rotates and the liquid level is electrically detected via the detection actuator and the detector. In such an arm float type liquid level detection device, when the liquid level in the tank changes due to road conditions such as the slope of the road surface or driving conditions such as vehicle acceleration/deceleration and turning, the liquid level change is directly reflected by the float. transmitted to the float arm,
There was a problem in which the readings on the gauges changed unexpectedly. In order to eliminate such problems, a tube that accommodates the float so as to be able to move up and down is attached to the liquid level detector body that is attached to the tank. An arm rotatably attached to the liquid level detector body is connected to the float in the cylinder via a connecting member, and its vertical movement rotates the arm. The cylinder is connected to detect the liquid level, and by giving a time difference between the change in the liquid level in the tank and the change in the liquid level in the cylinder through the cylinder, the influence of road surface conditions and driving conditions can be reduced. A method that makes it difficult to accept is known from Japanese Utility Model Application Publication No. 52-60860. However, since this is because the float moves up and down inside the cylinder, the liquid in the tank flows into the cylinder not only through the hole at the bottom end of the cylinder but also through the movement groove of the float arm provided in the cylinder. This increases the speed of liquid inflow, reducing the time difference between the change in the liquid level in the tank and the change in the liquid level in the cylinder, which has the sufficient effect of preventing fluctuations in the instrument display due to the influence of road surface conditions and driving conditions. There are some aspects that cannot be expected.

[Purpose of the invention]

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a liquid level detection device that can prevent fluctuations in instrument display due to the influence of road surface conditions and driving conditions.

[Structure of the invention]

In order to achieve the above object, the present invention includes a housing that surrounds at least the float arm, the float, and the pivot portion of the float arm, and the housing includes a first chamber that substantially follows the movement area of the float, and a rotation area of the float arm. A second chamber narrowed along the moving area is formed, and a through hole is provided in the housing to communicate the inside and outside.

[Embodiments of the invention]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

As shown in the first embodiment of FIGS. 1 to 3, the lid 2 of the liquid level detector main body 1 is fixed to the upper end opening 5 of the tank 4 via the gasket 3, and the lid is fixed. A receiving portion 8 formed protruding from the end is fixed by a shaft 9, and the box-shaped housing 7 is attached with the bottom portion substantially following the bottom portion of the tank 4. The box-shaped housing 7 is formed by fitting the peripheral wall portions 10A and IOB of the pair of housing bodies 7A and 7B and fixing them with screws 11, and one housing body 7A is connected to the support portion through the receiving portion 8. 6, and both housing bodies 7A,
On the tip side of 7B, almost along the movement area of the float 12,
A curved first chamber 14 is formed by the protruding wall portion 13A of the one housing body 7A and the flat wall portion 13B of the other housing body 7B. A second chamber 17 is formed substantially along the rotation area of the float arm 15 and narrowly divided by the flat wall portion 16A of the one housing body 7A and the flat wall portion 16B of the other housing body 7B. , the first chamber 14 and the second chamber 17 form a stepped portion 18
The housing body 7 of the second chamber 17 is
On the A side, there is an arc-shaped projection 1 that guides the float arm 15.
9 and the upper and lower limit stoppers 20 of the float arm 15.
20A is formed. A potentiometer 21 serving as a detection portion is fitted into the base end side of the second chamber 17, and its flange 22 is fixed with screws 23. Further, a connecting member 25 is fixed to the rotating shaft 24 of the potentiometer 21, which is a detection operation part, with a screw 26.
The proximal end of the float arm 15 disposed in the second chamber 17 is fitted into the groove 27 formed in the screw 2.
It is fixed by 6. A float 12 disposed in the first chamber 14 is disposed on the tip side of the float arm 15.
is installed. Furthermore, through holes 28 are provided at the top and bottom of the housing main body 7A, respectively, to communicate the inside and the outside. Therefore, the float 12 floating directly on the liquid surface moves up and down in the curved first chamber 14 in response to changes in the liquid level in the tank 4, and the float arm 15 moves up and down in the curved first chamber 14.
The float arm 15 rotates around the rotary shaft 24 while being guided within the range regulated by the stopper 20.20A within the fan-shaped second chamber 17 sandwiched between the steps 18. A rotating shaft 24 integrally connected to the base end side of the float arm 15 via a connecting member 25 rotates, and a change in electrical resistance is detected by the action of the potentiometer 21. In this case, depending on the road surface condition such as the slope of the road surface, the driving conditions such as vehicle acceleration/deceleration, and turning, one tank 4
Even if the liquid level inside changes, the liquid inside the tank 4 will not flow into the housing 7.
housing 7 through small through holes 28 provided above and below the housing 7.
Since there is a considerable time difference between the liquid level in the housing 7 and the liquid level in the tank 4, the change in the liquid level is not directly transmitted to the float 12 in the box-shaped housing 7. First, fluctuations in the instrument display due to the influence of road surface conditions and driving conditions can be effectively prevented, and liquid does not flow into the movement groove of the float arm 15 compared to the conventional system in which only the float 12 is disposed in the cylinder. Therefore, the time difference becomes quite large, and the display fluctuation can be effectively prevented.

4 and 5 show a second embodiment, and the same parts as those in the above embodiment are denoted by the same reference numerals. The box-shaped housing 7 is attached with the bottom of the tank 4 substantially following the bottom of the tank 4. On the front end side of the box-shaped housing 7, a straight first wall is formed substantially along the movement area of the float 12 and formed by protruding wall portions 13A and 13B of both housing bodies 7A and 7B, respectively.
A chamber 14A is formed, which extends substantially along the rotation area of the float arm 15 from the first chamber 14A toward the base side and the tip side, and both housing bodies 7A.

A second chamber 17A is formed by the flat wall portions 16A and 16B of 7B, and the first chamber 14A and the second chamber 17A are connected by a stepped portion 18.
Upper and lower limit stoppers 20.20A of the float arm 15 are formed on the housing main body 7A side of the chamber 17A. Further, the float 12, the float arm 15, the potentiometer 21, and the through hole 28 are arranged in the same manner as in the above embodiment. The float 12 is slidably inserted loosely into the insertion hole 29 of the float arm 15.

Therefore, the float 12 directly floating on the liquid surface in response to changes in the liquid level in the tank 4 is located in the straight first chamber 14A.
Along with this, the float arm 15 moves up and down inside the step part 1.
The float arm 15 rotates around the rotating shaft 24 within the rectangular second chamber 17A narrowed by the stopper 20.20A. A rotating shaft 24 integrally connected to the side via a connecting member 25 rotates, and a change in electrical resistance is detected by the action of the potentiometer 21.

In this case, even if the liquid level in the tank 4 changes due to road surface conditions or driving conditions, the change in the liquid level is not directly transmitted to the housing 7, as in the above embodiment, and there is a considerable time difference, so fluctuations in the instrument display are prevented. Good prevention.

Although the above embodiment shows a case where a potentiometer is used as the detection section, the resistance value may also be detected using a variable resistor and a contactor.Also, in the case of a digital meter, a binary The digital signal may be detected by a group of contacts arranged in a cord and a movable contact. Further, the box-shaped housing may surround at least the float arm, the float, and the pivot portion of the float arm, and may appropriately surround the detection operation section and the detection section. Note that the float arm may be a rotatable float arm provided with a float via another arm.

〔Effect of the invention〕

The present invention includes a housing that surrounds at least the float arm, the float, and the pivot portion of the float arm, and the housing includes a first chamber that extends approximately along the movement area of the float, and a first chamber that extends approximately along the rotation area of the float arm. A second chamber is formed in the housing, and the housing is provided with a through hole that communicates the inside and outside, so that the liquid level detection device can prevent fluctuations in the instrument display due to the influence of road surface conditions and driving conditions. can be provided.

[Brief explanation of drawings]

Figures 1 to 3 show the first embodiment; Figure 1 is an overall vertical cross-sectional view, Figure 2 is an overall cross-sectional view, Figure 3 is an exploded perspective view, and Figure 4 is an exploded perspective view of the second embodiment. FIG. 5 is a cross-sectional view showing the main part of FIG. 4. ■=・Liquid level detector body 7−・Housing 9・−・
Shafts 13A, 13B-Wall portions 14, 14A
-・First room 15- Float arm 16A, 16
B-・Wall part 17.17A, -Second room 21-・
- Detection part 24 - Detection actuation part 28 - Through hole

Claims (1)

[Claims] The proximal end of a float arm is rotatably supported on the liquid level detector body, and a float that moves up and down in accordance with changes in the liquid level is provided on the distal end of the float arm. A detection actuator is provided on the side thereof to respond to rotation of the float arm due to the vertical movement of the float, and a detection part is provided on the liquid level detector main body to electrically convert the vertical movement of the float via the detection actuator. In a liquid level detection device provided with a housing, at least the float arm, the float, and a pivot portion of the float arm are surrounded by a housing, and the housing includes a first chamber substantially along a movement area of the float, and a rotation area of the float arm. 1. A liquid level detecting device, characterized in that a second chamber narrowed substantially along the region is formed, and a through hole is provided in the housing to communicate the inside and the outside.