JPS5827457Y2 - Float type liquid level detector float - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a float for a float type liquid level detector.

A float-type liquid level detector is well known that detects when a predetermined liquid level has been reached by operating an internal switch mechanism when the floating posture changes as the liquid level increases or decreases.

In the float of the present invention, the opening of the hollow float body in such a float-type liquid level detector is double-closed from the front and back, and it is tightly sealed without using adhesive. It has characteristics.

To explain the drawings, 1 is a plug made of soft resin, 2 is a cable insertion hole drilled in the center of the plug 1, and 3 is a plug made of soft resin.
4 is a metal ring led out from the circumferential side of the plug body 1; 4 is a switch holding cylinder installed around the cable insertion hole 2 so as to be concentric with the metal ring 3; 5 is a metal ring 3 and a switch holding cylinder 4; An annular groove 6 formed between the circumferential surfaces of the metal ring 3 is a female thread carved on the inner periphery of the metal ring 3.

7 is a hollow float body made of hard resin; 8 is a cylindrical opening, on the outer periphery of which is carved a male thread 9 that opposes the female thread 6 on the inner periphery of the metal ring 3; shall be formed on the fitting surface 10 corresponding to the outer periphery of the root portion of the switch holding cylinder 4.

To close the cylindrical opening 8 of the hollow float body 7 with the stopper 1, a cylindrical opening is formed in the ring groove 5 by screwing the male thread 9 of the cylindrical opening 8 into the female thread 6 of the metal ring 3. The inner periphery of the cylindrical opening 8 is brought into close contact with the outer periphery of the root portion of the switch holding cylinder 4 by press-fitting the portion 8.

When the plug body 1 is screwed onto the float body 7 in this way,
One is made of soft resin and the other is made of hard resin, so
The threaded state between the inner periphery of the metal ring 3 and the outer periphery of the cylindrical opening 8 becomes tight and constitutes a strong threaded sealing surface A, and the cylindrical opening 8 is pressed in the inner radial direction. As a result, its inner circumference and
The fitting state between the switch holding cylinder 4 and the outer periphery of the root portion is also tight, forming a pressure-fitting sealing surface B.

Furthermore, the circumferential edge of the cylindrical opening 8 forms a pressure sealing surface C by coming into pressure contact with the bottom surface of the annular groove 5.

Since sealing surfaces are formed at key points in this way, the retention of water inside the float is extremely strong.

A mercury switch or other switch mechanism 11 is accommodated in the switch holding cylinder 4 and fixed with a filler 12, and the core wire 14 of the cable 13 inserted through the cable insertion hole 2 is
It is the same as before.

In addition, the liquid level detector configured in this way is floated on the liquid surface, and the internal switch mechanism 11 is activated by fluctuations in the floating posture as the liquid level increases and decreases to reach a predetermined rise limit and Detecting that the lowering limit has been reached is also the same as in the past.

Conventionally, this type of float type liquid level detector has a structure as shown in FIG. 4, in which both the float body 7' and the cap 1 are made of hard resin, and the hollow float body 7'
In order to close the opening with the cap 1', a method is adopted in which an adhesive is applied to the caulked joint surface A'.

Not only does this gluing work require manpower, but the use of adhesives that are harmful to the human body is undesirable from the standpoint of occupational health.

In addition, in the conventional structure, when an impact or pressing force is applied from the outside of the float in the direction of the arrow, the joint surface A' tends to separate or a gap is formed, which impairs the water sealing function.

As described above, in the float of the present invention, the plug body 1 is made of soft resin, and the female thread 6 of the metal ring 3 is screwed into the male thread 9 of the cylindrical opening 8, so that the cylindrical opening 8
The inner periphery of the switch holding cylinder 4 is pressed against the outer periphery of the root of the switch holding cylinder 4, forming a screw sealing surface A and a housing sealing surface B in a double-sealed manner, thereby firmly maintaining watertightness.
This method has the advantage of being efficient and sanitary since the work of applying adhesive to each joint surface can be omitted.

Furthermore, since the inside of the cylindrical opening 8 is seated so as to be integrated with the outer periphery of the root of the switch holding cylinder 4, even if an impact or pressing force is applied from the outside of the float, there will be no gap in the sealing surface. Therefore, the water sealing function is not impaired in any way.

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional side view of the main part of the liquid level detector with the float structure of the invention, Fig. 2 is a longitudinal sectional side view of the main part of the float body in the float of the invention, and Fig. 3 is a longitudinal sectional side view of the plug body in the float of the invention. 4 are longitudinal sectional side views of essential parts of a liquid level detector having a conventional float structure. 1... Plug body, 2... Cable insertion hole,
3...Golden ring, 4...Switch holding cylinder,
5...Ring groove, 6...Female thread, 7...
... Hollow float body, 8 ... Cylindrical opening, 9 ... Male thread, 10 ... Fitting surface.

Claims (1)

[Scope of utility model registration request] A switch holding tube 4 concentric with the metal ring 3 is implanted in a metal ring 3 led out from a plug body 1 made of soft resin and having a cable insertion hole 2 in the center, and an annular groove 5 is installed around the outer circumference of the root thereof. At the same time, a female thread 6 is carved on the inner periphery of the metal ring 3,
A male thread 9 is carved on the outer periphery of the cylindrical opening 8 of the hollow float body 7 made of hard resin, and the inner periphery is a fitting surface 10 corresponding to the outer periphery of the root of the switch holding cylinder 4. By screwing the male thread 9 of the cylindrical opening 8 of the float body 7 into the female thread 6 of the lead-out metal ring 3 of the plug body 1, the cylindrical opening 8 is press-fitted into the annular groove 5 and the cylindrical opening 8 is closed. The float of the float type liquid level detector is configured such that the inner periphery of the float is brought into close contact with the outer periphery of the root of the switch holding cylinder 4.