JPH07286679A - Hot water mixing valve - Google Patents

Abstract

PURPOSE:To always provide hot water with constant temperature and a constant flow rate by vertically moving regulating valve having two disks on the upper and lower sides by means of a shape memory alloy spring analogly varying its pressing force according to oil temperature and a bias spring having pressing force in the opposite direction to that of the shape memory alloy spring. CONSTITUTION:In execution of a snow melting system in a cold district, while a stop cock is opened for melting snow, pressing force of a shape memory alloy spring 13 is strong as temperature of hot water from a boiler is comparatively high, so that a regulating valve 11 is lifted while a bias spring 16 is pressed down. Therefore, a disk 9 on the lower side closes most of the parts of a hot water inlet port 5, while a disk 8 on the upper side opens most parts of a water inlet port 3. In this way, a small amount of boiling water and a large amount of cold water are mixed up, and proper temperature hot water is fed to a snow melting tank. On the other hand, if the temperature of the hot water is lowered, pressing force of the shape memory alloy spring 13 is reduced and the regulating valve 11 is lowered by being pressed by the bias spring 16, so that the amount of hot water is increased, while the amount of water is reduced, and as a result the temperature of the hot water after mixing are regulated to the proper temperature by the same way.

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 for mixing hot water and water at a constant temperature, and more particularly to a temperature and flow rate control valve used in a snow melting system in cold regions.

[0002]

2. Description of the Related Art In recent years, in snowy and cold regions, a snow melting system has begun to spread, in which a snow melting tank is provided on the premises, snow-removed snow is collected and placed in the snow melting tank, and water is poured to melt it. The snowmelt tank is buried in the ground and covered with a lid.When melting the snow, the lid is removed and the snow is poured, and the water is poured into the gutter. There are two methods: pumping water or using hot water from a hot water boiler. However, the running cost of groundwater is low,
The temperature was a little low, snow melting took a long time, and there was always concern about water shortage. In addition, as a method of using hot water from the boiler, there were a method of operating the boiler at a low temperature and a method of discharging hot water as it is, but in the former, the life of the boiler is extremely shortened due to low temperature corrosion. In the latter case, the kerosene cost is very high as a running cost.

[0003]

SUMMARY OF THE INVENTION In view of the above problems, the present invention appropriately mixes hot water discharged from the boiler by operating the boiler at high temperature and water having the same pressure as hot water through the pressure reducing valve. Warm water at a constant temperature (for example, 15 to 20).
It is an object of the present invention to eliminate all the above-mentioned drawbacks by providing a hot and cold water mixing valve which is automatically controlled so that the temperature (.degree.

[0004]

Therefore, in the mixing valve of the present invention, the side wall is provided with the first hot water inlet, the second hot water inlet serving as another inlet for hot water from the first hot water inlet, the hot water inlet, and the outlet. Insert a control valve consisting of two discs with a diameter slightly smaller than the cylinder diameter and a small diameter portion between the two into the cylinder-shaped valve box at the position corresponding to the above-mentioned inlet and inlet, and set the boiler heating temperature. By a compression spring made of a shape memory alloy that senses a change in hot water temperature due to fluctuations and changes the pressing force (hereinafter referred to as a shape memory alloy spring), and a bias spring that presses the shape memory alloy spring with a regulating valve in between. By moving the adjusting valve up and down and appropriately changing the mixing ratio of hot and cold water, hot water of a constant temperature can be obtained.

[0005]

In the mixing valve of the present invention, when the heating temperature of the boiler is low, the pressing force of the shape memory alloy spring is lowered, and the adjusting valve moves in the direction of opening the hot water inlet by being pressed by the bias spring to reduce the amount of hot water. Increase and decrease water volume,
The pressing force of the shape memory alloy spring increases as the heating temperature rises, and on the contrary, the amount of hot water is decreased and the amount of water is increased, so that the temperature of the water becomes almost constant during the winter period. As long as you branch from two pressure reducing valves and use hot and cold water of the same pressure, you can always supply a constant temperature and a fixed amount of hot water, and since there are two inlets, the shape memory alloy spring keeps the hot water flowing constantly. Therefore, it is possible to quickly respond to the temperature of the hot water that changes delicately.

[0006]

EXAMPLES Examples will be described with reference to the drawings. FIG. 1 is a schematic diagram of a snow melting system using the hot and cold water mixing valve of the present invention, in which high pressure water from the water tap A is decompressed through a pressure reducing valve B and enters the boiler C and the hot and cold water mixing valve of the present invention. D
Branch into the incoming water. The hot water heated by the boiler C also enters the hot and cold water mixing valve D, becomes hot water of approximately 15 to 20 ° C., is passed through the pipe E and the water stop valve F with adjustable flow rate, is guided to the snow melting tank G, and is pipe H. It gushes from the hole that I made. The melted snow flows from the drain pipe I into the gutter.

The present invention will be described with reference to FIG. 2 and FIG. 3 showing a vertical cross-sectional view thereof in the direction perpendicular thereto. Reference numeral 1 denotes a valve box, which has a cylinder 2 inside and a side wall which opens into the cylinder 2. The water inlet 3, the outlet 4, and the first inlet 5 are provided, and the second inlet 6 is provided on the same axis as the first inlet 5. The end of the second inlet 6 is closed by the plug 7, but either one may be the first inlet due to the convenience of piping. The water inlet 3 and the outlet 4 are rectangular as shown in FIG. 3, and the first and second inlets are circular.

In the valve box 1, there are two disks 8 and 9 having a diameter slightly smaller than that of the cylinder 2 and having the same diameter at positions corresponding to the water inlet 3 and the hot water inlets 5 and 6, and the flow of the mixed water between them. A regulating valve 11 having a small diameter portion 10 is formed to form a passage. The adjusting valve 11 is pressed upward by a shape memory alloy spring 13 locked to a bottom lid 12 connected to the lower end of the valve box 1 and screwed with an upper lid 14 connected to the upper end of the valve box 1. A downward pressing force is applied by a bias spring 16 that is locked to the screw 15. In addition, 17 and 18 are O for leakage prevention.
It's a ring.

1 to 3 show a state in which the stop cock F is opened and snow is melted, the temperature of the hot water from the boiler is relatively high, and the pressing force of the shape memory alloy spring 13 is accordingly increased. The adjustment valve 11 is raised while pressing the bias spring 16, the lower disk 9 closes most of the hot water inlets 5 and 6, and the upper disk 8 opens most of the water inlet 3.
Hot water from the first inlet 5 flows directly to the outlet 4 side through the gap between the first inlet 5 and the upper end of the lower disk 9 and the same amount of hot water passes through the shape memory alloy spring 13 portion. Second bath entrance 6
And through the gap at the upper end of the lower disk 9 to the outlet 4 side. Water from the water inlet 3 and the upper disk 8
Through the large gap at the lower end of the cylinder 2 and the small diameter portion 10
It flows to the outlet 4 side through the gap of. That is, a small amount of hot water and a large amount of cold water are mixed to form moderately warm water,
It is sent to the snow melting tank G by the water supply pressure of the pressure reducing valve B.

When the hot water temperature decreases due to the change in the boiling temperature of the boiler, the pressing force of the shape memory alloy spring 13 decreases, and the bias spring 16 presses the adjusting valve 11 down. Therefore, the opening areas of the hot water inlets 5 and 6 are increased, and the amount of hot water is increased accordingly. On the contrary, the opening area of the hot water inlet is decreased and the water amount is decreased, and the temperature of the hot water after mixing is almost constant. . Further, since the disks 8 and 9 do not reach the outlet 4, the flow rate does not change much. Snow melting temperature is 15
The most desirable range is -20 ° C, and finally the adjusting screw 1
Adjust so that the temperature range is reached by adjusting 5. When the adjusting screw 15 is lowered, the set temperature becomes higher, and when it is raised, the set temperature becomes lower. The hot water from the first hot water inlet 5 always passes around the shape memory alloy spring 13 and the second hot water inlet 6
Since it flows from the outlet to the outlet 4 side, the hot water does not stagnate as in the case where the second hot water inlet is not provided, so that the shape memory alloy spring can be used for the change of the hot water temperature due to the fluctuation of the boiling temperature of the boiler. 13 can react quickly,
Therefore, the change in the set temperature is reduced accordingly.

The present invention will be described with reference to another embodiment shown in FIG. 4. The water inlet 3 and the first inlet 5 and the second inlet 6 on the opposite side of the first inlet 5 and the shaft center are flush with each other. Each of them is formed in a rectangular shape on the upper side, and one or two outlets 4 are formed at right angles so as to be located in the middle portion thereof. Regulator valve 11
Has small diameter projections 19 and 20 on the upper and lower disks 8 and 9, respectively, and a bias spring 16 and a shape memory alloy spring 1 respectively.
It is used as a guide for 3. The adjusting screw 15 is provided on the bottom lid 12, and the pressing force of the shape memory alloy spring 13 is changed to adjust the set temperature. The operation mode is the same as that of FIGS. 2 and 3, but if the rectangular width of the inlets 5 and 6 is set to half of that of the inlet 3, the inlet 3 and the inlet due to the vertical movement of the regulating valve 11 The increase and decrease of the opening areas of 5 and 6 can be made exactly the same, and the set temperature and the flow rate can be controlled more precisely. The hot and cold water mixing valve of the present invention can be easily applied to a system for supplying appropriate temperature water, such as a shower facility at a beach, a hot water supply facility for an indoor pool, etc., without changing the design of the present invention. is there.

[0012]

As described above, according to the present invention, the shape memory alloy spring that changes the pressing force in an analog manner according to the temperature of the hot water and the bias spring having the pressing force in the opposite direction have the upper and lower disks. Since the control valve that moves the adjustment valve up and down to change the opening area of the water inlet and the water inlet is used, if the water inlet and the water inlet are connected to the pipe branched from one pressure reducing valve, the water temperature in winter In addition to being almost constant, hot water with a constant temperature and flow rate can always be obtained, and since there are two inlets, the shape memory alloy spring is always exposed to the flowing hot water and there is no stagnation of the hot water. Therefore, the shape memory alloy can respond sensitively to fluctuating hot water temperature, and if the hot and cold water mixing valve of the present invention is used, the boiler can be burned at a high temperature without fear of water shortage, so that shortening of life due to low temperature corrosion can be prevented, And few Since it is possible to provide a proper temperature water in fuel costs,
In addition to the advantages that the snow melting efficiency is improved and the running cost is low, since there is no packing in the moving part, there are few failures and the unit price is low.

[Brief description of drawings]

FIG. 1 is a schematic view of a snow melting system using the hot and cold water mixing valve of the present invention.

FIG. 2 is a sectional view of a hot and cold water mixing valve of the present invention.

FIG. 3 is a sectional view taken along the direction perpendicular to FIG.

FIG. 4 is a sectional view showing another embodiment of the present invention.

[Explanation of symbols]

 1 Valve Box 2 Cylinder 3 Water Inlet 4 Outlet 5 First Bath Inlet 6 Second Bath Inlet 8, 9 Disk 10 Small Diameter 11 Control Valve 13 Shape Memory Alloy Spring 16 Bias Spring

Claims (1)

[Claims] 1. A water inlet on a side wall of the cylinder provided inside,
The outlet, the first inlet, and the second inlet, which is another inlet for hot water from the first inlet, are opposite to each other with the first inlet and the second inlet on the same axis centered on the cylinder. In addition, the valve box is provided so that the outlet is located in the middle of the water inlet and the water inlet, and the water inlet and the water inlet are supported so that the opening area of the water inlet and the water inlet can be increased or decreased by moving up and down in the cylinder. A control valve which basically consists of two discs having a diameter slightly smaller than the cylinder at the position to be placed and a small diameter portion between them, and is housed in the inlet-side cylinder and presses the control valve toward the outlet side. A hot and cold water mixing valve consisting of a shape memory alloy spring that senses the temperature of hot water and transforms, and a bias spring that is housed in the inlet side cylinder and presses the adjusting valve toward the outlet side.