JP4143924B2 - Float type liquid level detector - Google Patents

Description

  The present invention relates to a float type liquid level detector.

A float type liquid level detector is known in which an annular float is fitted on the outer periphery of a stem suspended in a liquid tank, and a stopper for restricting the vertical movement of the float that moves up and down according to the liquid level is provided. The stopper in the liquid level detector is inserted into a screw hole penetrating from the outer peripheral surface of the O-ring fitted to the outer periphery of the stem toward the inner peripheral surface, and the tip of the set bolt is inserted into the outer periphery of the stem. This is a method in which a surface is pressed against one point (see, for example, Patent Document 1).
Japanese Utility Model Publication No. 52-47098 (drawing)

  When the float hits the stopper as the liquid level fluctuates, the stopper may fall off due to impact, and it is necessary to firmly fix the stopper to the stem to prevent it. However, with the conventional method shown in Patent Document 1, it is necessary to strongly screw the set bolt in order to strengthen the stopper fixing force, and only one point outside the stem is strongly pressed with the tip of the set bolt. As a result, a strain force is generated, a crack is generated in the stem, and liquid enters the inside, causing a malfunction of the internal reed switch. The problem to be solved by the present invention is to provide a float type liquid level detector capable of firmly fixing a stopper without damaging the stem.

In order to solve the above-described problem, in the float type liquid level detector of the present invention, a pair of clamping seats that protrude outward from both ends of the notch portion of the C-shaped ring that fits to the outer periphery of the stem are formed on the inner surface. Opposing with a gap, screw holes for screw insertion are engraved in one clamping seat, and through holes for bolt insertion are drilled in the other clamping seat and bent to the clamping bolt The outer surface of the clamping seat is formed as an upwardly inclined surface from the root to the tip so that no stress acts, and the bolt is inserted through the bolt insertion hole. Most importantly, when the inner peripheral surface of the C-shaped ring is pressed against the outer peripheral surface of the stem and fixed by screwing into the screw hole for screw insertion, the inclined surface having the upward gradient is wiped away. Features.

  Unlike the conventional fixing method in which a pressing force is intensively applied to only one point on the outer peripheral surface of the stem, according to the present invention, the pressing force of the stopper acts like a belt over almost the entire periphery of the stem and an equal force is applied. Therefore, there is no fear of deforming the stem or causing a crack. In addition, as the tightening bolt screwing progresses, the slope of the upward slope on the outer surface of the tightening seat is wiped away, and the entire back surface of the bolt head is gradually in close contact with the outer surface of the tightening seat. Smooth and effective tightening is performed, and the stopper can be firmly fixed to the outer periphery of the stem.

Best Mode for Carrying Out the Invention

  In the drawings of the embodiment, reference numeral 1 denotes a hollow stem, which houses a reed switch 2 and hangs down into a liquid tank. Reference numeral 3 denotes an annular float fitted on the outer periphery of the stem 1, and a magnet 4 for turning the reed switch 2 on and off is internally provided. Reference numeral 5 denotes a stopper for restricting the vertical movement of the float 3, and a pair of tightening seats 6a and 6b extending laterally outward from both ends of a notch portion of the C-shaped ring fitted to the outer periphery of the stem 1 are mutually connected. The inner side faces each other with a slight gap g, one screw seat 7a has a screw hole 7a for screw insertion, and the other screw seat 6b has a through hole 7b for bolt insertion. The outer surface of the tightening seat 6b is formed on the inclined surface 8 which is inclined upward from the root portion toward the tip. Then, the fastening bolt 9 is inserted through the bolt insertion through hole 7b and screwed into the screw insertion screw hole 7a, whereby the inner peripheral surface of the C-shaped ring is brought into pressure contact with the outer peripheral surface of the stem 1. The stopper 5 is fixed.

  As the gap g between the fastening seats 6a and 6b is narrowed by screwing the fastening bolt 9 into the screw hole 7a, the gradient of the inclined surface 8 on the outer surface of the fastening seat 6b is gradually wiped off. The entire back surface of the bolt head of the tightening bolt 9 is evenly in close contact with the outer surface of the tightening seat 6b so that no bending stress is applied to the tightening bolt 9 and smooth and effective tightening is performed. Can be firmly fixed to the outer periphery of the stem 1. And since the press-contact force of the stopper 5 acts like a strip over almost the entire circumference of the stem 1 and an equal force is applied, there is no possibility that the stem 1 is deformed or cracked. The operation width of the float 3 that moves up and down according to the liquid level is regulated by the stoppers 5 and 5 thus fixed.

  It is a principal part vertical side view of the float type liquid level detector of this invention.   It is a cross-sectional top view of the stopper in this invention float type liquid level detector.   It is a cross-sectional top view which shows the fixing process of the stopper in the float type liquid level detector of this invention.   It is a cross-sectional top view which shows the fixing state of the stopper in this invention float type liquid level detector.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Stem 3 Float 5 Stopper 6a One clamping seat 6b The other clamping seat 7a Screw hole 7b Through-hole 8 Inclined surface 9 Tightening bolt g Gap

Claims (1)

In the float type liquid level detector, an annular float is fitted on the outer periphery of the stem suspended in the liquid tank, and a stopper is provided for restricting the vertical movement of the float that moves up and down according to the liquid level. A pair of tightening seats that protrude outward from both ends of the C-shaped ring that fits to the outer periphery of the stem face each other with a gap on the inner surface. A screw hole for insertion is engraved, a through hole for inserting a bolt is formed in the other fastening seat, and the outer side surface of the fastening seat is arranged from the root so that bending stress does not act on the fastening bolt. A C-shaped ring is formed on the inclined surface having an upward slope toward the tip, and is inserted into the bolt screw hole through the bolt bolt through the bolt insertion hole. the inclined surface of the rising gradient is paid when the inner circumferential surface of the fixing by pressure contact with the outer peripheral surface of the stem Float liquid level detector, characterized in that configured to be.

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