JPH0225030Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement in a temperature-responsive valve that automatically opens and closes a valve port by using a shape memory alloy spring and a bias spring that expand and contract with temperature changes.

As this kind of temperature-responsive valve, the applicant filed an application in 1983-
The structure shown in No. 103871 has already been provided. The temperature-responsive valve has a valve body 1 as shown in FIG.
A screw member 4 includes an upper holding body 2 having a large diameter circular part 2a having a spring holding groove 3a formed on its circumferential surface and a small diameter circular part 2b having a spring holding groove 3b formed on its circumferential surface in a concentric vertical direction. a large-diameter circular portion 5a which is fixedly installed through the other side and has a spring retaining groove 6a formed on its circumferential surface;
A lower holder 5 having a small-diameter circular portion 5b with a spring retaining groove 6b formed on the circumferential surface in a concentric vertical direction is integrally provided on the valve shaft 7a of the valve 7, and a lower holder 5 is provided in an inner position between the opposing upper and lower holders 2 and 5. A compressed coil-shaped shape memory alloy spring 9 for biasing the valve 7 in the direction of closing the valve port 8 is installed through the spring holding grooves 3b and 6b of the small diameter circular portions 2b and 5b, and a shape memory alloy spring 9 in the form of a compression coil is attached to the outside position. Above large diameter circular part 2
A bias spring 10 in the form of a tension coil is attached to bias the valve 7 in the opposite opening direction through the spring holding grooves 3a and 6a of 5a, and the main body 1 is maintained at a high temperature by the passing fluid. When the inside of the main body 1 becomes low temperature, the shape memory alloy spring 9 overcomes the bias spring 10 and expands as shown in the figure, lowering the valve 7 and closing the valve port 8. Conversely, when the inside of the main body 1 becomes low temperature, the bias spring 10 The structure is such that the valve 7 is lifted by overcoming the shape memory alloy spring 9 and the valve port 8 is opened.

In the temperature-responsive valve having such a structure, the valve 7 is supported so as to be movable up and down within the main body 1 only by the springs 9 and 10 installed at the inner and outer positions between the upper and lower holding bodies 2 and 5. The holding of both springs 9 and 10 supporting 7 is as follows:
In either case, both ends of the springs are simply rotatably screwed into the respective holding grooves of the upper and lower holding bodies 2 and 5, so the screwing and holding state of each spring end may be due to dimensional errors in the holding grooves themselves, or It tends to become extremely unstable due to changes in the pitch interval when the spring expands and contracts, and the valve 7
reliable support may not be guaranteed.

Furthermore, forming retaining grooves 3a, 3b, 6a, and 6b for screw engagement on each peripheral surface in accordance with the wire diameter of each spring 9, 10 requires high precision in processing.
There are also major problems in terms of manufacturing and processing.

The present invention was devised in view of the above-mentioned drawbacks of the temperature-responsive valve, and has a spring retaining portion with an inverted U-shaped cross section on the outer periphery inside the valve body, and a spring inserted in the center portion. An annular movable holding body having a mounting hole is provided so as to be movable up and down, and a shape memory alloy spring is installed between the outer circumferential spring holding part of the movable holding body and a valve seat member forming a valve port. The movable holding body is moved up and down by expansion and contraction, and a tight bias spring is inserted into the center spring insertion hole of the movable holding body, and the upper part of the tight bias spring is inserted into the spring insertion hole. The large diameter part is larger than the hole, and the part from the large diameter part to the lower side is made into a gradually smaller diameter part, and the flanged tip of the valve stem of the valve is placed within the minimum diameter lower end of the gradually smaller diameter part. The above-mentioned drawbacks are effectively solved by engaging the valve and supporting the valve so that it can be raised and lowered.

Hereinafter, the present invention will be described in detail based on an illustrative embodiment. As shown in FIGS. 2 and 3, the temperature-responsive valve according to the present invention has an inverted U-shaped cross section at the outer periphery within the valve body 11. An annular movable holder 12 having a spring holder 12a and a spring insertion hole 12b in the center is provided so as to be movable up and down, and a valve port 18 is formed with the outer periphery spring holder 12a of the movable holder 12. A compression coil shaped shape memory alloy spring 1 is placed between the valve seat member 15.
The movable holder 12 is attached to the main body 11 by the expansion and contraction of the shape memory alloy spring 19.
Also, the central spring insertion hole 12b of the movable holding body 12
A bias spring 20 in the form of a tight tension coil is inserted in the , and specifically, the upper portion of the bias spring 20 in the form of a tight tension coil is movable with a diameter larger than the diameter of the spring insertion hole 12b. Large diameter portion 20 that engages with the upper surface of the outer peripheral spring holding portion 12a of the holding body 12
a, and a portion extending from the large diameter portion 20a to the lower side is a gradually smaller diameter portion 20b inserted into the spring insertion hole 12b, and within the minimum diameter lower end 20c of the gradually smaller diameter portion 20b. The valve 17 is supported in the main body 11 so as to be movable up and down by engaging the tip of the valve shaft 17a of the valve 17 with the flange 16.

Therefore, in a temperature-responsive valve having such a configuration, when the temperature inside the main body 11 is maintained at a high temperature, the outer circumferential spring holding portion 12a of the movable holding body 12 and the valve seat member are held together as shown in FIG. 3A. The shape memory alloy spring 19 attached between the two ends of the frame 15 expands, and the movable holder 12 also rises accordingly. The upward movement of the movable holding body 12 is caused by the large diameter portion 2 of the bias spring 20 that is engaged with the upper surface of its own outer circumferential spring holding portion 12a.
Since the small diameter portion 20b gradually exerts its own spring force and pulls the valve shaft 17a upward, the valve 17 rises and the valve seat member 15
This will close the valve port 18 of the valve.

Conversely, when the temperature inside the main body 11 becomes low, the shape memory alloy spring 19 senses the temperature and contracts, so the movable holder 12 also lowers accordingly, causing the valve 17 to lower, contrary to the above. Therefore, the valve port 18 is automatically opened.

When the valve 17 is raised and lowered, the bias spring 20 that supports the valve shaft 17a of the valve 17 via the collar 16 takes its own shape and fits into the central spring insertion hole 12b of the movable holder 12. Since the valve 17 is held securely against the valve 17, the valve 17 is reliably supported and stable vertical movement can be obtained.

As described above, the present invention provides an annular movable holder which has a spring holder having an inverted U-shaped cross section on the outer periphery and a spring insertion hole in the center inside the valve body so as to be movable up and down. A shape memory alloy spring is installed between the outer circumferential spring holding part of the movable holder and the valve seat member forming the valve port, and the movable holder is moved up and down by the expansion and contraction of the shape memory alloy spring. A close-fitting bias spring is inserted into the center spring insertion hole of the body, and the upper part of the tight-fitting bias spring has a large diameter portion larger than the spring insertion hole. The part from the large diameter part to the lower side is made into a gradually smaller diameter part, and the flanged tip of the valve shaft of the valve is inserted into the minimum diameter lower end of the gradually smaller diameter part to support the valve so that it can be raised and lowered. Because of this feature, the structure of the upper and lower holders as in the temperature-responsive valve of Utility Model Application No. 103871/1988, which has already been described, is completely unnecessary, and this alone greatly simplifies the structure of the valve itself.

In addition, there is no need to form a retaining groove that matches the wire diameter of the spring, which requires high processing precision, and the shape memory alloy spring can be mounted simply by interposing it between the movable retainer and the valve seat member. This structure also contributes to simplifying the structure of the temperature-responsive valve itself.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing a conventional temperature-responsive valve in a closed state, Fig. 2 is an exploded perspective view of the main parts of the temperature-responsive valve according to the present invention, and Fig. 3A is a diagram showing the same temperature-responsive valve. A cross-sectional view showing the valve in the closed state, and FIG. 1B is a cross-sectional view showing the valve in the open state. 11... Valve body, 12... Movable holding body, 12a
...Outer periphery spring holding part, 12b...Central spring insertion hole, 15...Valve seat member, 16...Brim, 17...
Valve, 17a... Valve stem, 18... Valve port, 19... Shape memory alloy spring, 20... Bias spring.

Claims (1)

[Scope of utility model registration request] An annular movable holder having a spring holder having an inverted U-shaped cross section on the outer periphery and a spring insertion hole in the center is provided in the valve body so as to be movable up and down, and the outer periphery of the movable holder is capable of holding the spring. A shape memory alloy spring is installed between the valve seat member forming the valve opening and the valve opening, and the movable holder is moved up and down by the expansion and contraction of the shape memory alloy spring. The structure is such that a tight-fitting bias spring is inserted, and the upper part of the tight-fitting bias spring is a large-diameter part that is larger than the spring insertion hole, and the large-diameter part extends to the lower side. The valve shaft is configured to have a gradually smaller diameter portion, and the flanged tip of the valve shaft of the valve is inserted into the minimum diameter lower end of the gradually smaller diameter portion, so that the valve is supported so as to be movable up and down within the main body. Temperature-responsive valve.