JPS5827458Y2 - Float of float type liquid level detector - 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 this invention, the plug that closes the opening of the hollow float body in such a float-type liquid level detector is made of soft resin, and it can be tightly sealed without using adhesive. It is characterized by the fact that it is

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 switch holding tube installed in the local part of the cable insertion hole 2 so as to be concentric with the plug 1, and 5 is a switch holder 3 and switch holding tube 4. This is an annular groove formed between the circumferential surfaces of the groove, and has a groove bottom surface 5' that receives a convex abutting edge 10 on the diurnal end surface of the cylindrical opening 8, which will be described later.

Reference numeral 6 indicates a female thread carved on the inner periphery of the test piece 3.

Numeral 7 is a hollow float made of hard resin, and 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 probe 3.

Further, the diurnal end surface of the cylindrical opening 8 is formed into a convex abutment edge 10 having a circular arc shape, chevron shape, or other cross-sectional shape.

To close the cylindrical opening 8 of the hollow float body 7 with the stopper 1, a cylindrical opening is formed in the annular groove 5 by screwing the male thread 9 of the cylindrical opening 8 into the female thread 6 of the ring 3. The convex abutting edge 10 of the cylindrical opening 8 is brought into pressure contact with the groove bottom surface 5' of the annular groove 5 by press-fitting the portion 8.

When the plug body 1 is screwed onto the float body 7 in this way,
Since one is made of soft resin and the other is made of hard resin, the convex abutting edge 10 bites into the groove bottom surface 5' to form a strong press-fitting sealing surface A.

In addition, the cylindrical opening 8 is sandwiched between the front and back sides of the soft resin, and the inner periphery of the trial 3 and the outer periphery of the cylindrical opening 8 are tightly screwed together to form a strong threaded seal. Forms surface B.

Furthermore, as a result of the cylindrical opening 8 being pressed in the radial direction, the fit between the inner periphery and the outer periphery of the root of the switch holding cylinder 4 becomes tight, thereby forming a stall sealing surface C.

Since sealing surfaces are formed at key points in this way, the watertightness within 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 manner is floated on the liquid surface, and the internal switch mechanism 11 is activated by fluctuations in the floating position as the liquid level increases and decreases to reach a predetermined upper limit and lower limit. Detecting when the limit has been reached is also the same as before.

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 of ' with the cap 1', a method is adopted in which an adhesive is applied to the joint surface B' in advance.

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.

Furthermore, 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 B' may peel off or a gap may be formed, causing the water sealing function to be impaired.

As described above, in the float of the present invention, the plug body 1 is made of a soft resin, the float body 7 is made of a hard resin, and the diurnal end surface of the cylindrical opening 8 is a convex abutting edge. 10, by screwing the male thread 9 of the cylindrical opening 8 into the female thread 6 of the metal ring 3, the convex abutting edge 10 is formed.
are press-welded so as to bite into the groove bottom surface 5' of the annular groove 5 to form a strong press-fitting sealing surface A, and the male thread 9 and the female thread 6
Since the threaded state of the screw is tight and forms a strong threaded sealing surface B, watertightness is extremely strong.
There is no need to apply adhesive to each joint surface as in the past, and the adhesive application work can be omitted, which has the advantage of being efficient and sanitary.

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

[Brief explanation of the drawing]

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, 5'...Groove bottom, 6...
... Female thread, 7 ... Hollow float body, 8
......Cylindrical opening, 9...Male thread, 1
0...Convex abutting edge.

Claims (1)

[Scope of utility model registration request] A switch holding cylinder 4 concentric with the ring 3 is implanted in a mantle 3 led out from a plug body 1 made of soft resin and having a cable insertion hole 2 in the center, and on the outer periphery of the root thereof, An annular groove 5 having a groove bottom surface 5' for receiving a convex abutting edge 10 on the circumferential end surface of the cylindrical opening 8 is formed, and a female thread 6 is carved on the inner periphery of the groove 3. A male thread 9 is attached to the outer periphery of the cylindrical opening 8 of the hollow float body 7.
At the same time, the diurnal end surface is formed into a convex abutting edge 10, and the male thread 9 in the cylindrical opening 8 of the hollow float body 7 is screwed into the female thread 6 in the lead-out opening 3 of the plug body 1. According to the above, a cylindrical opening 8 is press-fitted into an annular groove 5, and the convex contact edge 10 of the cylindrical opening 8 is brought into pressure contact with the groove bottom surface 5' of the annular groove 5. float.