JPH0434059B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to improving the usability of a hot water supply apparatus in which a terminal hot water faucet is located far away from a hot water heat source device such as a central hot water supply system.

Prior Art A conventional central hot water supply system is shown in Fig. 3. The hot water supply system route runs from a hot water heat source device 2 of an electric water heater, etc. (there are also gas water heaters, oil water heaters, heat pump water heaters, etc.) with a built-in electric heater 1 to hot water piping 3.
It consists of a hot water supply valve 4, a hot water supply faucet 5, etc. installed in the kitchen, washroom, bathroom, etc.

Further, the water supply system path is composed of a water supply pipe 6, a water supply valve 7 which is integrated with the hot water supply valve 4, and the like. The hot water faucet 5 is generally installed at a location far away from the hot water heat source device 2.

Problems to be Solved by the Invention In the above configuration, when hot water is desired especially in the morning when it is cold in winter, even if the hot water supply valve 4 is opened, the hot water does not come out immediately and first remains in the hot water supply pipe 3. Cold water whose temperature is almost the same as the outside temperature (5
~10℃) comes first.

Then, the hot water gradually changes to a higher temperature, and unless the water supply valve 7 is operated, the hot water will eventually reach the hot water heater 2.
The hot water is tapped at a high temperature (generally 85℃) that is close to the supply temperature.

This change characteristic is shown by the characteristic A shown by the solid line in FIG.

However, generally speaking, the hot water temperature when used in the kitchen etc. is around 40 degrees Celsius, so as it gradually gets hotter, turn off the water supply valve 7 quickly or in small increments.
At the same time, the hot water flow rate also changes, so it is necessary to adjust both the hot water supply valve 4 and the water supply valve 7 to obtain the desired hot water flow rate and hot water temperature. be. The hot water tapping characteristics in this case are shown by broken lines B or C in FIG.

Also, there is waste, such as by throwing away the cold water that first comes out of the hot water faucet 5, or by not using the hot water effectively while adjusting the flow rate and temperature of the hot water. It was a lot.

Means for Solving the Problems The present invention solves the conventional problems as described above. A terminal hot water supply device is provided with a mixing valve that communicates the hot water side inlet provided at the lower part of the vessel and is composed of at least a temperature detection part, a hot water side throttle part, and a water side throttle part and controls the flow rate mixing ratio of hot water and water. The outlet part provided at the top of the container and the water supply pipe equipped with a water supply valve are connected to the mixing valve, and the temperature detection part is arranged downstream of the confluence of hot water and water in the mixing valve, and The part is disposed upstream of the hot water side inlet part, and the water side throttle part communicates with the water supply piping.

Function When the hot water supply valve is opened, the low-temperature water that has accumulated in the hot water supply piping passes through the hot water side throttle section and flows from the hot water side inlet provided in the terminal water heater, causing the water that has already reached a high temperature in the terminal water heater to flow through the hot water side throttle section. The hot water is pushed out from the outlet. Also, a portion of the water flows out from the outlet while mixing with hot water. The forced out or flowed hot water is supplied to the mixing valve. On the other hand, when the hot water supply valve is opened, water that has passed through the water supply valve, which is opened almost simultaneously, is also supplied to the mixing valve. Then, the hot water and water are mixed at the confluence point of the mixing valve and are discharged after passing through the temperature detection section.

At this time, the opening degrees of the hot water side throttle part and the water side throttle part are adjusted according to the signal from the temperature detection part so that the hot water temperature reaches a preset temperature, and hot water at an appropriate temperature is supplied from the beginning of use. In this case, the hot water temperature setting is set to a low temperature, and even if the opening degree of the hot water side throttle section is throttled to an extremely small value, the internal pressure of the terminal water heater will not increase.

Of course, even when the hot water supply valve is closed, no closing pressure is applied to the terminal water heater.

Embodiment An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. Note that the same components as those in the prior art are given the same numbers and the description thereof will be omitted.

8 is a water supply pipe; 9 is a terminal water heater; the heat source 10 is built into the hot water heater 2 and has a lower capacity than the electric heater 1;
Built-in. At the lower part of the terminal water heater 9, there is an inlet part 11 on the hot water side supplied from the hot water heat source 2, and at the upper part there is an outlet part 12 for hot water discharged from the terminal water heater 9. The inlet portion 11 and the outlet portion 12 are communicated through a bypass pipe 13 and mixed at a primary confluence point 13a.

Reference numeral 14 surrounded by a dashed line is a thermostatic automatic mixing valve whose flow rate mixing ratio is automatically adjusted to a set temperature. The temperature detection section 14a is disposed downstream of the final confluence point 14b of hot water and water, and the hot water side throttle section 14c is disposed upstream of the hot water side inlet section 11 of the terminal water heater 9. 14d is configured to communicate with a water supply pipe 6 provided with a water supply valve 7.

In addition, the inlet section 11 and the outlet section 12 of the terminal water heater 9
The flow path resistance passing through the inside of the terminal water heater 9 and the flow path resistance passing through the bypass piping 13, which are configured in parallel between the two, are configured to be approximately equal.

In order to make the explanation easier to understand, conditions are temporarily set as follows. In other words, the season is winter, the hot water supply temperature from the hot water heater 2 is 85°C, and the temperature at which the hot water is supplied from the terminal water heater 9 is 85°C.
The boiling temperature is 85°C, the temperature of the frozen water in the hot water supply pipe 3 is 5°C, and the capacity of this remaining water (sometimes referred to as dead water) is 5°C.

The hot water storage capacity of the terminal water heater 9 is 2.5, which is half of the retained water capacity 5.

In the above configuration, a set temperature control knob (not shown) provided on the thermostatic automatic mixing valve 14
When the hot water supply valve 4 and water supply valve 7 are opened, 1/2 of the cold 5°C accumulated water 5 flows inside the terminal water heater 9, and the remaining 1 /2 will flow through the bypass pipe. Therefore, the hot water temperature at the primary confluence point 13a is approximately 45°C.
Therefore, at approximately this temperature, the thermostatic automatic mixing valve 14
When the hot water flows to the hot water faucet 5, hot water is immediately supplied at a temperature of 42°C. Even if you change the set temperature to 30℃, hot water at the predetermined temperature of 30℃ will be dispensed from the beginning. 2 and 5 in FIG. 2 show this hot water tapping characteristic.

In the explanation so far, the case where there is bypass piping 13 has been described, partly because the hot water storage tank of the terminal water heater 9 is configured to be as small as possible to achieve the desired purpose, but the hot water storage tank of the terminal water heater 9 is If the outlet section 12 is arranged close to the inlet section 11 on the hot water side by increasing the temperature, the cold water at 5° C. will be appropriately mixed inside the terminal water heater 9 and the hot water will be discharged, thereby bypassing the hot water side. The purpose of instant hot water supply can be achieved even without piping.

Effects of the Invention As described above, according to the instant hot water supply device of the present invention,
The following effects can be obtained.

(1) By arranging terminal water heaters in series downstream of the hot water heat source device, and communicating the wake of the terminal water heaters and the water supply piping to the mixing valve, when hot water is desired, the There is no inconvenience like cold water coming out and then hot water coming out after a while.
This makes it possible to realize an ideal water heater that provides hot water at a set temperature from the beginning.

(2) By arranging the temperature detection part of the mixing valve downstream of the confluence of hot water and water, and arranging the hot water side throttle part upstream of the hot water side inlet of the terminal water heater, one configuration of the terminal water heater is achieved. No pressure is applied to the hot water storage tank, which is a part of the system, under any usage conditions.

In other words, the hot water supply valve that opens and closes the hot water side and adjusts the flow rate, and the hot water side throttle part of the mixing valve for temperature control are disposed on the upstream side of the terminal water heater, resulting in a stop type configuration. Therefore, no pressure is applied to the hot water storage tank of the terminal water heater under any circumstances, so the hot water storage tank has the advantage of being non-pressure resistant (shape other than sphere or cylinder) and being made of resin, which can be produced at low cost. be.

In addition, since the stop type does not apply pressure to the hot water tank, there is no need for pressure reducing check valves, safety valves, etc. as a terminal water heater, which has the advantage that it can be constructed at a low cost as a product. It is something that you have.

[Brief explanation of drawings]

Fig. 1 is a block diagram of an instant hot water supply device showing an embodiment of the present invention, Fig. 2 is a hot water supply characteristic diagram of the same device, Fig. 3 is a block diagram of a conventional hot water supply device, and Fig. 4 is a hot water supply diagram of the conventional device. It is a characteristic diagram. 2...Hot water heat source device, 3...Hot water supply piping, 4...Hot water supply valve, 6...Water supply piping, 7...Water supply valve,
9...terminal water heater, 11...hot water side inlet section, 14...
...Mixing valve, 14a...Temperature detection section, 14b...Confluence point, 14c...Hot water side throttle section, 14d...Water side throttle section.

Claims (1)

[Scope of Claims] 1 A hot water side inlet provided at the lower part of the terminal water heater is connected to a hot water heat source device and a hot water piping provided with a hot water supply valve on the downstream side of the hot water heat source device, and at least a temperature detection portion is provided. and a mixing valve configured of a hot water side throttle part and a water side throttle part and controlling the flow rate mixing ratio of hot water and water, and a water supply pipe provided with an outlet part and a water supply valve provided at the upper part of the terminal water heater. communicate with the mixing valve, the temperature detection section is disposed downstream of the confluence of hot water and water of the mixing valve, and the hot water side throttle section is disposed upstream of the hot water side inlet section. and the water side throttle part communicates with the water supply pipe. 2. A heat source is built into the terminal water heater, and the heat source is arranged in parallel between the hot water side inlet and outlet so that the flow path resistance through the inside of the terminal water heater and the flow path resistance through the bypass piping are approximately equal. An instant hot water supply device according to claim 1.