JPS632705Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of an automatic mixing valve for an instantaneous water heater that is connected to the outlet piping of the instantaneous water heater and mixes hot water and water at an appropriate temperature for use.

The conventional automatic mixing valve for instantaneous water heaters is
It is connected in the middle of the piping between the water heater and the faucet, and its structure is as shown in Figures 4 and 5, with a low-temperature water inlet 1 from the water pipe on one side and an inlet from the instantaneous water heater on the other. A mixing chamber 15 is provided in the center and communicated with the mixed water outlet 3 through water passage holes 8 and 8', respectively. Inside the mixing chamber 15, a heat sensitive member 4 (e.g. It has a built-in thermal expansion material such as thermowax, and the thermal expansion material expands due to the temperature of the inflowing hot water, so that the drive rod 16 of the heat sensitive member 4 protrudes and presses the lower end of the temperature setting adjustment screw 14 provided at the upper part, and the reaction occurs. , the heat-sensitive member 4 is pushed down, the low-temperature water regulating valve 6 is opened, and the high-temperature water regulating valve 7 is biased in the direction of closing at a certain interval). , 7, the hot water and water are appropriately mixed and adjusted to the operating temperature to supply hot water.

The temperature inside the mixing chamber 15 is set by the degree of tightening of the adjusting screw 14, and by tightening the adjusting screw 14, the vertical position of the drive member 4 changes, and the high temperature water regulating valve at the beginning of use changes. The degree of opening for the water passage port 7 is set in advance by an adjusting screw 14.

However, the automatic mixing described above has the following drawbacks.

That is, at the beginning of use, the high-temperature water regulating valve 7 is open, so when the faucet is opened, the high-temperature water first flows into the mixing chamber 15, and then the heat-sensitive member 4 detects the high-temperature water and pushes the low-temperature water regulating valve 6. It is lowered and opened to allow low-temperature water to flow into the mixing chamber 15, while also pushing down the high-temperature water regulating valve 7. At this point, the area of the water passage hole 8' of the high temperature water inlet 2 is somewhat closed by the valve 7, so the flow rate of the water passage hole 8' is throttled and the instantaneous water heater supplies even higher temperature water. . Therefore, the heat-sensitive member 4 in the mixing chamber 15 further detects high-temperature water and opens the low-temperature water regulating valve 6 so that the temperature approaches the set temperature. Accordingly, the high-temperature water regulating valve 7 becomes close to the closed state, and the inside of the instantaneous water heater boils.Furthermore, the high-temperature water regulating valve 7 is closed, and the main burner of the water heater is turned off. Since the heat-sensitive member 4 is cooled by the low-temperature water, the low-temperature water regulating valve 6 is closed, and the high-temperature water regulating valve 7 returns to its initial open position.

Therefore, the inside of the instantaneous water heater constantly repeats the boiling state, so if an automatic mixing valve is not used and a separate pipe is used to draw hot water directly from the instantaneous water heater, it is extremely dangerous as there is a risk of burns. At the same time, the life of the heat absorbing can of the instantaneous water heater is shortened, and the temperature of the hot water used becomes unstable, making it extremely difficult to use.

This invention was developed in view of the above-mentioned drawbacks, and is designed for use in instant water heaters that will not cause the water in the instant water heater to boil under any circumstances, and that can continuously supply stable hot water. The purpose is to provide automatic mixing valves at low cost.

An embodiment of the present invention will be described below with reference to FIG.
17 has a mixing chamber 15 in the center, a low temperature water inlet 1 is provided through a water hole 8 on one side, a high temperature water inlet 2 is provided on the other side through a water hole 8', and a high temperature water inlet 2 is provided on the other side through a water hole 8'. Adjustment screw 1 for temperature setting
4 and an automatic mixing valve body with a mixed water outlet 3 at the bottom. Reference numeral 4 denotes a heat-sensitive member into which a thermally expandable material such as thermowax is inserted, and the expandable material is expanded and contracted by the heat of hot water to expand and contract the drive rod 16 provided at the tip.
The tip of the heat sensitive member 6 is brought into contact with the bottom of a hole provided at the bottom of the adjusting screw 14, and the main body portion of the heat sensitive member 4 into which the thermal expansion material is inserted is located approximately at the center of the mixing chamber 15. 6 is a low-temperature water regulating valve that is integrally attached to the heat-sensitive member 4 and opens and closes the water passage port 8 of the low-temperature water inlet 1 from inside the mixing chamber 15; A plurality of inflow holes are provided at the side, and a high-temperature water regulating valve 7 for opening and closing the water passage port 8' of the high-temperature water inlet 2 is attached to the side surface. Reference numeral 10 denotes a spring that constantly biases the heat-sensitive member 4, the low-temperature water regulating valve 6, and the high-temperature water regulating valve 7 upward. ing. A mixed water outlet 18 is provided below the heat-sensitive member 4 in the mixing chamber 15 and communicates with the mixed water outlet 3. 5 is provided above the water passage hole 8' of the peripheral wall 9 between the mixing chamber 15 and the high-temperature water inlet 2, and is provided at a location that does not face the high-temperature water regulating valve 7 even when it moves up and down, so that it is always connected to the high-temperature water inlet 2. This is a boiling prevention passage that ensures the minimum flow rate for communicating and preventing boiling.

Next, to explain the operation, first, when the faucet (not shown) of the pipe connected to the mixed water outlet 3 is opened,
Since the water in the piping on the high temperature water inlet 2 side flows, the main burner of the instantaneous water heater is ignited, and the high temperature water passing through the high temperature water inlet 2 is adjusted to a preset temperature by the high temperature water regulating valve 7. It flows into the mixing chamber 15 through the water passage hole 8' and the boiling prevention passage 5.
Then, the thermal expansion material of the heat-sensitive member 4 expands due to the heat of the high-temperature water, causing the drive rod 16 to protrude, and the fixed adjustment screw 14 pushes down the heat-sensitive member 6 including the drive rod 16, opening the low-temperature water regulating valve 6. As the low temperature water flows in, the high temperature water regulating valve 7 is also pushed down and the area of the water passage hole 8' is narrowed down. However, since the boiling prevention passage 5 is provided with a minimum flow rate to prevent boiling, even if the high temperature water regulating valve 7 completely closes the water passage hole 8', high temperature water will flow from the boiling prevention passage 5 into the mixing chamber. 15.
Then, it is mixed with low-temperature water in the mixing chamber 15 and used from the mixed water outlet 3.

Incidentally, the degree of opening of the water passage hole 8' and the size of the boiling passage 5 with respect to the set temperature are set in advance in consideration of the flow rate of the instantaneous water heater, the flow rate of low-temperature water, and the like.

Figure 2 shows another embodiment of the present invention, in which numeral 11 is a gap provided between the high temperature water regulating valve 7 and the peripheral wall 9 to ensure the minimum flow rate to prevent boiling water. be.

FIG. 3 shows another embodiment of the present invention, in which reference numeral 12 denotes a stopper provided below the high-temperature water regulating valve 7 on the peripheral wall facing the water passage hole 8'.
This stopper 12 allows the high temperature water regulating valve 7 in front of the water passage hole 8' to ensure the minimum flow rate to prevent boiling without completely closing the water passage hole 8'.

Therefore, the present invention is designed to ensure that when an instantaneous water heater is used in combination with an automatic mixing valve, the flow of high-temperature water from the instantaneous water heater is completely maintained at the high-temperature water inlet side of the automatic mixing valve under any conditions. Since there is no interruption, high-temperature water does not boil in the instantaneous water heater, which is extremely effective in terms of safety and longevity, and the temperature of the water is stabilized, making it extremely convenient to use. Moreover, the structure is simple and can be provided at low cost.

[Brief explanation of the drawing]

Fig. 1 is a vertical sectional view showing an embodiment of the present invention;
3 and 3 are longitudinal sectional views showing other embodiments of the present invention, and FIGS. 4 and 5 are longitudinal sectional views showing conventional embodiments. Explanation of symbols, 1...Low temperature water inlet, 2...High temperature water inlet, 3...Mixed water outlet, 4...Heat-sensitive member, 5...
... Boil prevention passage, 6 ... Low temperature water adjustment valve, 7 ... High temperature water adjustment valve, 8, 8' ... Water hole, 9 ... Peripheral wall,
10... Spring, 11... Gap, 12... Stopper, 13... Spring, 14... Adjustment screw, 15... Mixing chamber, 16... Drive rod, 17
...Automatic mixing valve body, 18...Mixed water outlet.

Claims (1)

[Scope of utility model registration request] It is connected to the hot water outlet side piping of the instant water heater and has a high temperature water inlet, a low temperature water inlet, a mixed water outlet, etc. connected to the mixing chamber through a water hole, and a low temperature water regulating valve and a high temperature water regulating valve in the mixing chamber. In an automatic mixing valve that mixes high-temperature water and low-temperature water to an appropriate temperature and supplies hot water by moving a drive rod of a heat-sensitive member equipped with a valve, an instantaneous water heater is placed between the high-temperature water inlet and the mixing chamber to prevent the water from boiling. An automatic mixing valve for instantaneous water heaters, characterized by having a boiling prevention passage that can ensure a minimum flow rate.