JPS641709B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a temperature-sensitive on-off valve that is automatically opened and closed depending on the external temperature, and provides a temperature-sensitive on-off valve that has a simple structure and has good temperature-sensitive on-off characteristics. The purpose is to

Next, the present invention will be explained in detail using illustrated examples.

The drawing shows an embodiment of the present invention, in which a cylindrical metal valve body 2 having a locking protrusion 1 in the middle thereof has an arcuate groove in cross-section with an open outer side inside the distal end side. Then, put wax 3 in that groove.
A rubber elastic toroidal body 9 filled with rubber and a metal cylindrical body 10 interposed between the inner surface of the opening of the elastic toric body 9
An inflatable annular valve body 4 is fitted, and at both ends of the inflatable annular valve body 4, an annular support ring 1 made of a metal plate having an elastic toroidal support portion having an arcuate cross section is fitted.
1 and 12 are in contact with each other, and the annular support ring 12 on the tip side
An annular presser washer 13 is brought into contact with the valve body 2, and the tip edge of the valve body 2 is bent by press working and strongly pressed against the presser washer 13, so that the opening of the elastic toric body 9 becomes cylindrical. The valve body 10 is crimped and fixed to both end surfaces, and the expandable annular valve body 4, each of the support rings 11 and 12, and the presser washer 13 are integrally tightened and fixed to the valve body 2.

The distal end portion of a plunger 5 in the form of a round rod having a conical distal end is concentrically inserted into the inflatable annular valve body 4, and the circular flange 7 integrally provided at the proximal end of the plunger 5 is inserted into the expansible annular valve body 4. It is slidably fitted inside the proximal end of the valve body 2, has a large number of water holes 6 around the flange 7, and is fitted and locked between the flange 7 and the proximal end of the valve body 2. A plunger pressing spring 8 is provided between the annular support washer 14 and the annular support washer 14.
is interposed in a compressed state, and the base end edge of the valve body 2 is bent by press working and engaged with the support washer 14, whereby the support washer 14 is fixed to the base end of the valve body 2, Furthermore, a male threaded portion 15 for attachment is provided on the outer periphery of the proximal end of the valve body 2 . Further, when the flange 7 is engaged with the locking protrusion 1, the tip of the plunger 5 is configured to be located within the expandable annular valve body 4.

When the temperature-sensitive on-off valve of the above embodiment is used as an antifreeze valve for an instantaneous water heater or the like, the male threaded portion of the valve body 2 is screwed and connected to a drain port of the instantaneous water heater or the like.

The outside temperature is the freezing point of wax 3 (e.g. 0°C)
When the following is the case, as shown in FIGS. 1 and 2, the volume of the solidified wax 3 is small, so the elastic torus 9 in the expandable annular valve body 4 contracts, and the elastic torus 9 An annular gap 16 is formed between the plunger 5 and the annular gap 16, so that water in a heat exchanger in an instantaneous water heater or the like passes through the through hole of the support washer 14, the water passage hole 6 of the flange 7, and the annular gap 16. This can prevent water from remaining in the instantaneous water heater and causing it to freeze.

Next, when the outside air temperature gradually rises and exceeds the melting point of the wax 3, the wax melts and its volume expands rapidly. Since the middle part of the cross section of 9 is expanded and deformed toward the plunger 5 and is crimped to the entire circumferential surface of the plunger 5,
Said annular gap 16 is closed. Therefore, drainage from the temperature-sensitive shut-off valve is stopped. After the temperature-sensitive on-off valve closes, as the outside air temperature further rises, the volume of the melted wax expands little by little, so the elastic toric body 9 further expands, and the expansion force is applied to the plunger 5. As shown in FIG.
is moved against the elasticity of the spring 8.

The temperature-sensitive on-off valve of the present invention may be used as a temperature-sensitive on-off valve other than an antifreeze valve, or may be used by being immersed in a liquid. Furthermore, the inner surface of the opening of the elastic toric body 9 and both ends of the cylindrical body 10 may be fixed with an adhesive.

According to this invention, the locking protrusion 1 is provided inside the intermediate portion.
Inside the tip side of the cylindrical valve body 2 having
An inflatable annular valve body 4 filled with wax 3 is fitted and fixed therein, and a plunger 5 is inserted into the inflatable annular valve body 4, so that the temperature outside the temperature-sensitive on-off valve reaches the freezing point of the wax 3. If it is less than or equal to
When the expandable annular valve body 4 contracts and an annular gap 16 is formed between it and the plunger 5, and when the temperature outside the temperature-sensitive valve exceeds the melting point of the wax, the wax 3 melts. Due to the rapid volume expansion, the expandable annular valve body 4 expands toward the plunger 5 and comes into pressure contact with its entire circumferential surface, so that the annular gap 16 is closed, and the flow path is closed by a simple mechanism according to the external temperature. The inflatable annular valve body 4 senses the temperature from both its outer and inner circumferences, so the temperature-sensing opening/closing accuracy is good. A flange 7 is slidably fitted inside the proximal end of the valve body 2, and a spring 8 is engaged with the flange 7 to press it toward the inflatable annular valve body. Therefore, when the valve is opened, the plunger 5 can be held at a predetermined insertion position within the inflatable annular valve body 4 by the spring 8, and the flange 7 can be engaged with the locking protrusion 1. Since the tip of the plunger 5 is disposed within the inflatable annular valve body 4 when the valve is closed, if the inflatable annular valve body 4 further expands after the valve is closed, the expansion of the inflatable annular valve body Therefore, the thrust force acting on the tip of the plunger 5 presses and moves the plunger 5 against the elasticity of the spring 8, so that after the valve is closed, the expandable annular valve body 4 is expanded due to the volumetric expansion of the wax 3.
Even if the temperature-sensitive on-off valve expands strongly, no unreasonable force is applied to the temperature-sensitive on-off valve, so that the temperature-sensitive on-off valve can be prevented from being damaged and its durability can be improved.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, in which Fig. 1 is a longitudinal side view showing the valve in the open state, Fig. 2 is a sectional view taken along line A-A, and Fig. 3 shows the plunger moving after the valve is closed. FIG. In the figure, 1 is a locking protrusion, 2 is a valve body,
3 is wax, 4 is an inflatable annular valve body, 5 is a plunger, 6 is a water hole, 7 is a flange, 8 is a spring, 9
10 is a rubber elastic toric body, 10 is a metal cylindrical body, 11 is
Reference numeral 12 indicates an annular support ring made of a metal plate, 14 an annular support washer, 15 an external thread for mounting, and 16 an annular gap.

Claims (1)

[Claims] 1 Wax 3 is placed inside the tip side of the cylindrical valve body 2 which has a locking protrusion 1 inside the middle.
An inflatable annular valve body 4 that accommodates a The inflatable annular valve body 4 and the annular support rings 11 and 12 are fixed to the valve body 2, and the distal end portion of a plunger 5 having a conical tip is inserted into the inflatable annular valve body 4, and the plunger A flange 7 having a water passage hole 6 is provided at the base end of the valve body 5, and the flange 7 is slidably fitted inside the base end side of the valve body 2. When the spring 8 that acts to press the annular valve body 4 toward the annular valve body 4 is engaged and the flange 7 is engaged with the locking protrusion 1, the distal end portion of the plunger 5 presses against the inflatable annular valve body 4. A temperature-sensitive on-off valve characterized in that it is configured to be located within.