JPS6139905Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention is intended to improve the safety of a thermal valve and to ensure more reliable operation.

Generally, a thermally-responsive valve uses a heater to heat a thermoelement, and the thermal expansion of wax within the thermoelement opens and closes a valve for opening and closing a fluid. In other words, the fluid passage portion and the electrical equipment portion are close to each other, which poses a high risk of electrical leakage. In addition, since the above valve has its valve stem in contact with the tip of a movable shaft that moves up and down due to the expansion of wax, the axes of the valve stem and movable shaft may be misaligned due to dimensional errors during assembly. There are problems such as malfunction.

The present invention eliminates these problems, and one embodiment thereof will be described below with reference to the accompanying drawings.

In the figure, 1 is the valve body, and the fluid inlet/outlet 2
4, has a valve seat A in the valve body 1, and has a valve seat A in the valve body 1.
A valve rod 4 is fixed to the valve body 3. The valve body 3 is urged by a spring 9 so as to always come into contact with the valve seat A. 17 is valve rod 4
This is the O-ring of the sliding part seal. On the other hand, the wax element 22 is fixed to the element guide (made of thermosetting resin material) with a lock nut 5,
A heater 13 using a positive temperature coefficient thermistor is connected to the electrodes 12 and 1 on the wax part side of the wax element 22.
A thin sheet 10 made of silicon, Teflon, or the like is provided on the side of the electrode 11 which contacts the wax element 22, and electrically insulates the two. Furthermore, an insulating spacer 6 made of a thermosetting resin material is provided at the abutting portion of the movable shaft 23 of the wax element 22 and the valve body rod 4. In the above configuration, the electrodes 11, 12
The wax element 22 is heated by the heater 13, the wax in the wax element 22 used as an example of a thermoelement is expanded, and the pressure spring 9 is activated by the valve rod 4 through the insulating spacer 6. The valve 3 is pushed open upward against the force to form a fluid passage. Here, when the wax element 22 is not energized, the clearance between the movable shaft 23 and the insulating spacer 6 changes depending on the ambient temperature. This is unavoidable since the wax element 22 operates due to temperature differences. For this purpose, the shape of the insulating spacer 6 is approximately H-shaped or deep dish-shaped, and the valve rod 4 is fitted into the recess K, and the valve rod 4 is fitted with the maximum contact clearance with the movable shaft 23 of the wax element 22. By increasing the depth L of the recess K of the insulating spacer 6, the insulating spacer 6 is prevented from falling off.

This configuration ensures electrical insulation between the valve rod 4 and the wax element 22. Furthermore, the wax element 22 and the electrode 11 are connected to the insulating sheet 1.
With a value of 0, double insulation is achieved and safety is increased.

In the figure, 2 is a lid, 8, 14, 16 are fixing plates, 15 is a retaining plate, 18, 19 are O-rings, 2
0 and 21 are screws, and 24 is an outflow hole.

As described above, according to the present invention, it is possible to prevent the insulating spacer from falling off, so there is no risk of electrical leakage from electrical parts, resulting in extremely high safety, and the insulating spacer is made of thermosetting resin. Therefore, there is no possibility that the heat of the fluid will be conducted to the thermoelement and cause malfunction, and there will be no malfunction due to misalignment between the valve rod and the movable axis of the thermoelement.

[Brief explanation of the drawing]

The figure is a sectional view showing an embodiment of the present invention. 4... Valve rod, 6... Insulating spacer, 23...
...Movable axis, K...recess.

Claims (1)

[Scope of utility model registration request] An insulating spacer is provided at the contact area between the thermoelement movable shaft and the valve rod, a recess is provided in this insulating spacer, and the valve rod is fitted into this recess.The depth of this recess is the same as that between the thermoelement movable shaft end and the insulating spacer. The thermal valve is made larger than the maximum clearance that occurs at the abutting part of the valve, and the insulating spacer is made of thermosetting resin.