JP5634147B2 - Hot water system - Google Patents

Description

  The present invention relates to a hot water supply system including a plurality of hot water heaters.

Conventionally, as this type of hot water supply system, a plurality of, for example, two hot water heaters are connected in parallel to each other, and a hot water source terminal (such as a currant) connected to the junction of the hot water supply path of both hot water heaters Is known (see, for example, Patent Document 1). In such a hot water supply system, for example, when the amount of hot water stored in the tank of one of the water heaters is reduced, the source of hot water is automatically switched to the other water heater.

JP 2009-97804 A

By the way, in the hot water supply system as described above, at the time of switching the hot water source, hot water stays in the hot water supply path on the other hot water supply side that has not performed hot water supply until then, and the temperature of the retained hot water Decreases with time. For this reason, when the source of hot water is switched and the other water heater starts to supply hot water, low-temperature staying water in the hot-water supply channel flows into the hot water supply terminal side, which may cause a so-called cold water sandwich phenomenon.

The present invention has been made to solve the above-described problem, and provides a hot water supply system that can suppress a cold water sandwich phenomenon that occurs when a hot water source is switched between a plurality of hot water heaters connected in parallel to each other. Objective.

The hot water supply system of the present invention is a hot water supply system including a plurality of hot water heaters connected in parallel to each other, and a switching unit for switching a source of hot water is provided at a junction of a hot water supply path of each hot water heater. In the course of switching the hot water source from one water heater to the other, the hot water from both water heaters is mixed and discharged, and the hot water source is switched from one water heater to the other. After repeatedly switching to one water heater and the other water heater, switching to the other water heater is performed .

In this hot water supply system, the switching unit is composed of a three-way valve, and this three-way valve has a built-in ball for switching the source of the hot water with respect to the hot water supply terminal side, and this ball communicates with each hot water supply path of both hot water heaters. It is preferable to have the 1st and 2nd hole to perform, and the 3rd hole which makes these hot water supply paths communicate simultaneously.

In the hot water supply system, the three-way valve is configured so that the hot water supply paths of the hot water heaters pass through the first, second, and third holes of the ball in the course of switching the hot water source from one hot water heater to the other hot water heater. It is preferable to temporarily stop at positions where they are in communication with each other.

According to the hot water supply system of the present invention, when the switching unit switches the source of hot water from one to the other, even if low temperature hot water stays in the hot water supply path on the other hot water supply side that has not performed hot water supply until this time, Since the hot water is mixed with hot hot water from one of the water heaters at the switching unit, it is possible to prevent low temperature water from flowing into the hot water supply terminal. Therefore, the occurrence of the cold water sandwich phenomenon can be suppressed, and the user does not feel uncomfortable.

The block diagram of the hot-water supply system which concerns on one Embodiment of this invention. Sectional drawing of the three-way valve as a specific example of the switching part of a hot-water supply system same as the above. XX sectional drawing of FIG. (A) is a perspective view of the ball | bowl built in the said three-way valve, (b) is the top view. (A) is sectional drawing in the state in which the same three-way valve was switched to the one water heater side, (b), both in the middle of the same three-way valve being switched from the one water heater side to the other water heater side Sectional drawing when it exists in the position which mutually connects a water heater, (c) is sectional drawing in the state in which the same three-way valve was switched to the other water heater side.

A hot water supply system according to an embodiment of the present invention will be described with reference to FIG. The hot water supply system 1 includes a heat pump hot water heater 2 and a gas hot water heater 3, and these two hot water heaters 2 and 3 are connected in parallel to each other. The hot water supply system 1 also includes a switching unit 5 for switching the hot water source to either one of the hot water heaters 2 and 3 for the hot water supply terminal 4 and a control unit 6 for controlling the operation of the switching unit 5. Here, the heat pump type hot water heater 2 and the gas type hot water heater 3 constitute one hot water heater or the other hot water heater, respectively, and either one of the hot water heaters 2 or 3 is one or the other. It doesn't matter if it is.

The heat pump type hot water heater 2 uses a heat pump as a heat source to boil the water supplied from the water supply pipe 7a, and has a tank for storing the boiled hot water. ) Take out hot water. The gas-type water heater 3 boils water supplied from the water supply pipe 7b using gas fuel as a heat source, and has a tank for storing the heated water, and the hot water in the tank is used as a tapping pipe 8b (outlet hot water). Take the hot water from the route.

The switching unit 5 is composed of an electric switching valve such as a motor valve, and is disposed at a junction of the hot water supply pipes 8 a and 8 b and is connected to the hot water supply terminal 4 by a hot water supply pipe 9. When the hot water supply terminal 4 is opened in a state where the switching unit 5 is switched to the hot water heater 2 side, hot water from the hot water heater 2 passes through the hot water supply pipe 8a and the hot water supply pipe 9 due to the supply water pressure of the water supply pipe 7a. 4 hot water is supplied. The switching unit 5
When the hot water supply terminal 4 is opened in a state where the water heater is switched to the hot water heater 3 side, the hot water from the water heater 3 passes through the hot water supply pipe 8b and the hot water supply pipe 9 to supply hot water to the hot water supply terminal 4 due to the supply water pressure of the water supply pipe 7b. Is done.

The control unit 6 controls the operation of the switching unit 5 based on the amount of hot water stored in the tanks of the water heaters 2 and 3. For example, the control unit 6 detects the amount of hot water stored in the tanks of the water heaters 2 and 3 that perform hot water supply in real time, and when the amount of hot water stored is below a predetermined value, the control unit 6 supplies hot water. Switch to the other hot water heater 3, 2 side that is not present.

Here, in the hot water supply system 1 of the present embodiment, the switching unit 5 uses the hot water source as one of the hot water heaters 2 and 3.
In the course of switching from one to the other water heaters 3 and 2, the hot water from both the water heaters 2 and 3 is mixed and discharged. Specifically, in the course of switching the hot water source, the control unit 6 switches the switching unit 5 between the hot water heater 2 side and the hot water heater 3 side alternately and then switches to the other hot water heater 3 side. I do. At this time, the switching unit 5 is relatively short (about several seconds) between the water heater 2 side and the water heater 3 side.
It is desirable to perform switching operation. By the switching operation of the switching unit 5 as described above, the hot water from the hot water heater 2 and the hot water from the hot water heater 3 are mixed by the switching unit 5 and supplied to the hot water supply terminal 4, and then the hot water heater 3 serving as a hot water source. , 2 is supplied to the hot water supply terminal 4.

Thus, when the switching unit 5 switches the source of hot water from one to the other, even if low-temperature hot water remains in the hot water supply pipes 8b and 8a on the other hot water supply 3 and 2 side that have not performed hot water supply until then, Since this low temperature hot water is mixed with the high temperature hot water by one of the water heaters 2 and 3 in the switching unit 5,
Low temperature water can be prevented from flowing into the hot water supply terminal 4. Therefore, the occurrence of the cold water sandwich phenomenon can be suppressed, and the user does not feel uncomfortable. In addition, when hot water from both the hot water heaters 2 and 3 is mixed by the repeated switching operation of the switching unit 5, a cold water sandwich phenomenon occurs microscopically, but the inflow span of the low temperature water to the hot water supply terminal 4 is short, Since the low-temperature water and the hot water are mixed before reaching the hot water supply terminal 4, it is difficult to recognize by human senses and does not give an uncomfortable feeling.

Next, a specific example of the switching unit 5 used in the hot water supply system 1 will be described with reference to FIGS. The switching unit 5 according to this specific example uses a three-way valve 10. 2 to 4, a three-way valve 10 includes a ball 11 that is a valve body, a ball 11 built in, and three ports 12.
The valve body 12 has a, 12b, and 12c, and the drive unit 13 has an electric motor that rotates the ball 11.

The valve body 12 has a valve chamber 14 for rotatably accommodating the ball 11, and this valve chamber 14
Ports 12a, 12b, and 12c are formed so as to communicate with each other. Ports 12a, 12
b and 12c are arranged at an interval of 90 degrees from each other, and the ports 12a and 12b face each other. The port 12a is connected to the hot water piping 8a, the port 12b is connected to the hot water piping 8b,
The port 12 c is connected to the hot water supply pipe 9. The drive unit 13 has a shaft part 13 a for rotating the ball 11 around an axis parallel to the port 12 c, and the shaft part 13 a is inserted through the opening of the valve body 12 and connected to the ball 11. The drive unit 13 is driven and controlled by the control unit 6.

The ball 11 switches the source of the hot water from the hot water supply terminal side, and the hot water supply pipes 8a, 8
b and the first and second holes 11a and 11b for communicating the hot water supply pipe 9 with the hot water supply pipe 9;
and a third hole 11c for simultaneously communicating a and 8b. The first and third holes 11 a and 11 c of the ball 11 are formed at intervals of 90 degrees in the same plane orthogonal to the rotation axis of the ball 11, and ports for these holes 11 a and 11 c are formed by the rotation of the ball 11. 12a
, 12b is adjusted. The second hole 11b of the ball 11 is formed coaxially with the rotation axis of the ball 11 and always communicates with the port 12c.

The hot water source switching operation of the hot water supply system using the three-way valve 10 configured as described above will be described with reference to FIG. Here, first, as shown in FIG. 5 (a), the three-way valve 10 is in a state where the hot water source is switched to the hot water heater 2 side, and the first hole 11a of the ball 11 and the port 12a of the valve body 12 are used. Are opposed to each other, and the port 12a is fully open. In such a state, when the hot water supply terminal is opened, the hot water supply pipe 8a communicates with the hot water supply terminal side, so that hot water from the hot water heater 2 passes through the three-way valve 10 and is supplied to the hot water supply terminal.

Next, when the three-way valve 10 switches the hot water source from the hot water heater 2 side to the hot water heater 3 side under the control of the control unit, the ball 11 is rotated in the direction indicated by the arrow with respect to the valve body. And three-way valve 1
As shown in FIG. 5 (b), 0 indicates the first and second of the ball 11 in the course of switching the hot water source.
In addition, the switching operation is temporarily stopped at a position where the hot water supply pipes 8a, 8b are in communication with each other through the third holes 10a, 10b, 10c. In this stop position, the ball 11 is moved as shown in FIG.
The position is rotated about 45 degrees from the position shown. At this time, the hot water from both water heaters 2 and 3 is
It is mixed by the three-way valve 10 and supplied to the hot water supply terminal.

The ball 11 of the three-way valve 10 is rotated again after being stopped for a predetermined time, and when the third hole 11c and the port 12b of the valve body 12 reach a position facing each other as shown in FIG. Stops rotating. At this time, since the port 12b is completely opened and the port 12a is closed, the hot water supply from the water heater 2 is shut off, and hot water from the water heater 3 is supplied to the hot water supply terminal through the three-way valve 10. Will come to be. The three-way valve 10 may repeat the operation shown in FIGS. 5A to 5C or may be performed only once.

As described above, according to the hot water supply system 1 according to the present embodiment, the three-way valve 10 is positioned at which the hot water supply paths 8a and 8b are in communication with each other through the first, second, and third holes 11a to 11c of the ball 11. Therefore, the hot water from both water heaters 2 and 3 can be mixed effectively, and the effect of suppressing the cold water sandwich phenomenon can be obtained. In addition, after the hot water source is switched, the port 12a connected to one of the hot water heaters 2 is closed, and the hot water from the other hot water heater 3 can be blocked from flowing into the hot water heater 2, so that the hot water heater 2 In addition, a large load due to the backflow of hot water is not applied. In addition, the water heater of this system is a water supply directly connected water heater that supplies hot water by the supply water pressure,
When configured with a hot water storage type hot water heater that uses hot water to reduce pressure, a large load may act on the hot water storage type hot water heater due to hot water supply from a water supply direct connection type water heater. Such problems can be resolved by opening and closing the port.

In addition, this invention is not restricted to the structure of the said various embodiment, A various deformation | transformation is possible in the range which does not change the meaning of invention. For example, the type of the water heater is not limited to the gas type and the heat pump type, and may be a water heater or an electric water heater using solar heat, for example. Moreover, the number of water heaters connected to one inlet of the switching unit is not limited to one, and may be two or more.

DESCRIPTION OF SYMBOLS 1 Hot-water supply system 2, 3 Hot-water supply device 4 Hot-water supply terminal 5 Switching part 8a, 8b Hot-water supply piping (hot-water supply route)
10 Three-way valve (switching part)
11 ball 11a first hole 11b second hole 11c third hole

Claims (3)

In a hot water system comprising a plurality of water heaters connected in parallel to each other,
A switching unit for switching the source of hot water is provided at the junction of the hot water supply path of each water heater,
In the course of switching the hot water source from one hot water heater to the other hot water heater, the switching unit mixes hot water from both hot water heaters and outputs hot water, and the hot water source is switched from one hot water heater to the other hot water heater. Then, after repeatedly switching to one water heater and the other water heater, the hot water system is switched to the other water heater. The switching unit is composed of a three-way valve, and the three-way valve has a built-in ball for switching the hot water source with respect to the hot water supply terminal side, and the ball communicates with the hot water paths of the hot water heaters. 2. The hot water supply system according to claim 1 , further comprising: a second hole and a third hole for simultaneously communicating the hot water discharge paths. In the three-way valve, the hot water supply paths of both hot water heaters are in communication with each other through the first, second and third holes of the ball in the course of switching the hot water source from one hot water heater to the other hot water heater. The hot water supply system according to claim 2 , wherein the hot water supply system is temporarily stopped at a position.

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