JPH0861552A - Hot/cold water mixing cock - Google Patents

Abstract

PURPOSE: To provide a hot/cold water mixing cock for getting a desired temp. by mixing of hot water and cold water, in which normal operation of a spring made of shape memory alloy is ensured by hindering the cold water from touching the shape memory alloy spring directly. CONSTITUTION: Cold water having intruded into a valve chest 22 from a cold water inlet 23 runs against a cylindrical part 32 of a spool 29, flows to inside the spool 29 upon passing through a communication hole 33 provided in the cylindrical part 32. mixed with the hot water, and flows toward a spring 35 made of a shape memory alloy. The spool 29 is as a whole constructed in a hollow shape of small wall thickness.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot and cold water mixing valve (hot and cold water mixing valve) for mixing hot and cold water (hot water and cold water) to a desired temperature.

[0002]

2. Description of the Related Art As shown in FIG. 4, in a known hot and cold water mixing valve, cold water entering a valve chamber 52 from a cold water inlet 51 directly contacts a shape memory alloy spring 53. Originally, the shape memory alloy spring 53, which should be operated according to the temperature of the mixed water (the mixture of hot water and cold water in the valve chamber 52), malfunctions due to direct contact with the cold water.

[0003]

In view of the above points, the present invention has been devised so that cold water does not directly hit the shape memory alloy spring and the shape memory alloy spring operates normally. is there.

[0004]

In order to achieve the above object, a hot and cold water mixing valve according to the present invention includes a valve chamber provided with a cold water inlet and a hot water inlet displaced from each other in a reciprocating direction of a spool.
A temperature adjusting screw arranged on one end side of the valve chamber, a spring seat and a mixed water outlet provided on the other end side of the valve chamber, and a reciprocally housed in the valve chamber, and one end side of the one A first valve body portion that opens and closes the inlet is provided, and a second valve body portion that opens and closes the other inlet is provided at the other end side, and the first valve body portion and the second valve body portion are provided. A spool that is integrally connected by a tubular portion and that has a large number of communication holes in the tubular portion; and a bias spring that is interposed between the temperature adjusting screw and the spool to press the spool toward the other end side, A shape memory alloy spring that is interposed between the spring seat and the spool and presses the spool toward one end side, and the one inlet gradually opens when the spool moves toward the one end side. When the other inlet is gradually closed and the spool moves to the other end side, Square inlet gradually closed together of the said other inlet is what opens gradually.

[0005]

In the hot and cold water mixing valve of the present invention having the above-mentioned structure, the cold water that has entered the valve chamber from the cold water inlet hits the cylindrical portion of the spool and flows into the inside of the spool through the communication hole provided in this cylindrical portion. , Where it is mixed with hot water and then flows towards the shape memory alloy spring. Therefore, since the cold water does not directly contact the shape memory alloy spring, it is possible to prevent the shape memory alloy spring from malfunctioning.

[0006]

Next, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows the entire piping of a hot and cold water mixing unit including a hot and cold water mixing tap 1 according to the embodiment. Hot water is supplied from the hot water source 2 to the hot and cold water mixing valve 1 via the first check valve 3 and the first pressure reducing valve 4, and in parallel with this, the cold water source 5 to the second check valve 6, Cold water is supplied to the hot and cold water mixing valve 1 through the second pressure reducing valve 7, hot water and cold water are adjusted to a desired temperature in the hot and cold water mixing valve 1, and the flow rate is adjusted by the first solenoid valve 8. It A bypass 9 branches from the second pressure reducing valve 7, and the flow rate of cold water is adjusted by the second electromagnetic valve 10 without passing through the mixing stopper 1. Accordingly, hot water (mixed water) adjusted to a desired temperature and cold water can be used by switching. In the hot and cold water mixing unit having such pipes, the pressure reducing valves 4 and 7 are provided on the upstream side of the hot and cold water mixing plug 1, respectively.
Because of the arrangement, the temperature of the mixed water does not become unstable even if the pressure of the hot water source 2 or the cold water source 5 fluctuates.

The hot and cold water mixing valve 1 according to this embodiment has the structure shown in FIG. FIG. 3 is a perspective view of the spool 29 as a single item.

A valve chamber 22 is provided in the housing 21, and a cold water inlet 23 and a hot water inlet 24 are provided in the valve chamber 22 so as to be displaced relative to each other in the reciprocating direction of the spool 29 (left-right direction in the drawing). ing. One end side of the valve chamber 22 (left side in the figure)
The temperature adjusting screw 26 is screwed into the female screw portion 25 provided in the valve seat 22 and the annular spring seat 27 is attached to the other end side (right side in the drawing) of the valve chamber 22.
And a mixed water outlet 28 are provided.

A spool 29 is reciprocally housed in the valve chamber 22. The spool 29 has a cylindrical thin-walled hollow shape as a whole and has the following configuration. That is, an annular first valve body portion 30 that opens and closes the cold water inlet 23 is provided on one end side, and an annular second valve body portion 31 that opens and closes the hot water inlet 24 is provided on the other end side. One valve body 3
0 and the second valve body portion 31 are integrally connected by a tubular portion 32 having a smaller diameter than these, and the tubular portion 32 is provided with a large number of communication holes 33.

A bias spring 34 is interposed between the temperature adjusting screw 26 and the spool 29 to press the spool 29 toward the other end side, and between the spring seat 27 and the spool 29.
A shape memory alloy spring 35 for keeping the temperature of the mixed water at a desired temperature is interposed to press the spool 29 toward one end side, and the spool 29 is positioned where both springs 34 and 35 are balanced. There is. The temperature of the mixed water is adjusted by tightening or loosening the temperature adjusting screw 26 to change the balance position. Also this spool 29
When it moves to one end side, it gradually opens the cold water inlet 23 and gradually closes the hot water inlet 24, and when it moves to the other end side, it gradually closes the cold water inlet 23 and gradually opens the hot water inlet 24. It opens up to.

In the hot and cold water mixing valve 1 having the above-mentioned structure, the cold water that has entered the valve chamber 22 from the cold water inlet 23 hits the cylindrical portion 32 of the spool 29 and flows into the inside of the spool 29 through the communication hole 33. It is mixed with hot water at and then flows toward the shape memory alloy spring 35. Therefore, since the cold water does not directly hit the shape memory alloy spring 35, it is possible to prevent the shape memory alloy spring 35 from malfunctioning. Further, hot water does not directly contact the shape memory alloy spring 35, so that the shape memory alloy spring 35 can be prevented from malfunctioning. This effect is further increased by extending the spool 29 in the other end direction and distant the shape memory alloy spring 35 from the cold water inlet 23 and the hot water inlet 24, so that heat conduction by the spool 29 is also avoided. . Further, the spool 29, which has a cylindrical thin hollow shape as a whole, allows the mixed water to easily flow inside the spool 29 (less resistance), and because the pressure receiving area in the moving direction of the spool 29 is small, the spool 29 is pressed by water pressure. There is an advantage that it is difficult to move.

[0013]

The present invention has the following effects.

That is, in the hot and cold water mixing valve of the present invention, the cold water that has entered the valve chamber from the cold water inlet hits the cylindrical portion of the spool and flows into the inside of the spool through the communication hole.
Here it is mixed with hot water and then flows towards the shape memory alloy spring. Therefore, since the cold water does not directly contact the shape memory alloy spring, it is possible to prevent the shape memory alloy spring from malfunctioning. Also for hot water, since it does not directly hit the shape memory alloy spring,
It is possible to prevent the shape memory alloy spring from malfunctioning. Further, since the mixed water easily flows inside the spool having a thin cylindrical hollow shape as a whole, and the pressure receiving area of the spool in the moving direction is small, the spool is pushed by the water pressure and is difficult to move.

[Brief description of drawings]

FIG. 1 is a block diagram showing the entire piping of a hot and cold water mixing unit including a hot and cold water mixing tap according to an embodiment of the present invention.

FIG. 2 is a sectional view of the hot and cold water mixing tap.

FIG. 3 is a perspective view of a spool

FIG. 4 is a sectional view of a hot and cold water mixing valve according to a conventional example.

[Explanation of symbols]

 1 Hot Water Mixer 2 Hot Water Source 3,6 Check Valve 4,7 Pressure Reducing Valve 5 Cold Water Source 8,10 Solenoid Valve 9 Bypass 21 Housing 22 Valve Chamber 23 Cold Water Inlet 24 Hot Water Inlet 25 Female Threaded Part 26 Temperature Adjusting Screw 27 Spring Seat 28 Mixed Water Outlet 29 Spool 30, 31 Valve Body 32 Cylindrical Portion 33 Communication Hole 34 Bias Spring 35 Shape Memory Alloy Spring

Claims (1)

[Claims] 1. A valve chamber (22) provided with a cold water inlet (23) and a hot water inlet (24) displaced from each other in the reciprocating direction of a spool (29), and one end side of the valve chamber (22). Temperature adjusting screw (26) arranged at the other end, a spring seat (27) provided at the other end of the valve chamber (22), and a mixed water outlet (2).
8) and a first valve body portion (30) that is reciprocally housed in the valve chamber (22) and that opens and closes the one inlet (23) on one end side and the other on the other end side. A second valve body portion (31) for opening and closing the inlet (24) is provided, and the first valve body portion (30) and the second valve body portion (31) are connected to the tubular portion (32).
Are connected integrally with each other, and a large number of communication holes (3
3) provided with a spool (29), and a bias spring (34) interposed between the temperature adjusting screw (26) and the spool (29) to press the spool (29) toward the other end. , The spring seat (27) and the spool (2)
9) and a shape memory alloy spring (35) interposed between the spool (29) and the one end side to press the spool (29), the one inlet when the spool (29) moves to the one end side. (23) gradually opens and the other inlet (24) gradually closes, and when the spool (29) moves to the other end side, the one inlet (23) gradually closes and the other inlet A hot and cold water mixing tap characterized in that (24) is gradually opened.