JP3812438B2 - Hot water supply unit - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a hot water supply unit using a solar system.
[0002]
[Prior art]
Conventionally, as a hot water supply unit using a solar system, hot water prepared by heating in a hot water storage tank is not supplied as it is through a hot water supply passage connected to the hot water storage tank, but mixed with water to lower the hot water temperature. Convenience of supplying to the bathroom etc. after the hot water temperature is lowered or raised to a predetermined temperature set by the user, equipped with an automatic water heater as an auxiliary heat source, etc. in the middle of the hot water passage High ones have been proposed.
[0003]
In the above-described conventional hot water supply unit, a pressure reducing valve is provided in the middle of a water supply path provided to supply water to the hot water storage tank, and further, the hot water side and the water side mixed by the mixing valve Therefore, another pressure reducing valve was provided in the water supply channel provided for supplying water to the mixing valve. In other words, in the conventional hot water supply unit of this type, it is necessary to provide pressure reducing valves at two locations, which requires time and effort for installation and is expensive.
[0004]
[Problems to be solved by the invention]
This invention is made | formed in view of said point, and makes it a subject to provide the hot water supply unit for solar systems which enabled reduction of the effort and cost of attachment.
[0005]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, the hot water supply unit according to the present invention is branched into a water supply passage having one end connected to the water supply portion in the middle of the two, and the branched one is connected to a hot water storage tank provided with a heat source inside, In the hot water supply unit in which the other branched portion is connected to a hot water supply path arranged with one end connected to the hot water storage tank via a mixing valve, a pressure reducing valve is provided upstream of the branch point of the water supply path. wherein said a portion downstream of the pressure reducing valve of the water supply passage and a portion on the downstream side of the mixing valve of the hot water supply passage, causes connected in a separate branch water supply passage, the branch water supply path and the hot water supply passage The hot water supply unit is characterized in that a second mixing valve is interposed at the connection point. In this way, the supply water to the hot water storage tank and the supply water to the mixing valve can be made to have the same water pressure so that the mixing valve can be mixed well, and the pressure reducing valve provided in the water supply channel is provided. Since only one is required, the labor and cost of installation can be reduced.
[0006]
In addition, the mixing of water in the hot water supply channel is performed in two stages. If the hot water temperature is lowered to about 45 ° C. in the first mixing and fine adjustment is performed in the next mixing, the user's It becomes a highly convenient hot water supply unit that can always perform hot water supply at a set temperature.
[0007]
It is also preferable to provide an auxiliary heat source for temperature adjustment in the middle of the hot water supply path, and in this way, when the hot water temperature is lower than the temperature set by the user, fine adjustment can be performed with the auxiliary heat source. As a result, it becomes a more convenient hot water supply unit.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described based on embodiments shown in the accompanying drawings. In FIG. 1, the hot water supply unit 1 using the solar system of an example in embodiment of this invention is shown. The hot water supply unit 1 is provided with a hot water storage tank 2 for storing hot water and an expansion tank 3 for storing antifreeze as a heat medium, and the expansion tank 3 and the solar panel unit 5 are provided with a heat exchanger 4 on the way. They are connected by a circulation pipe 6 that is interposed. The heat exchanger 4 is built in the lower part of the hot water storage tank 2, and the antifreeze heated by the solar panel unit 5 is circulated through the heat exchanger 4 by the pump 21 to warm the hot water in the hot water storage tank 2. It is like that. Further, a tank hot water outlet 7 is formed at the upper end of the hot water storage tank 2, and the hot water supply path 8 for supplying hot water to a hot water discharge portion 18 such as a shower or a currant installed in the bathroom 20 is provided as the above. One end of the tank is connected to the tank hot water outlet 7.
[0009]
A water supply channel 11 having one end connected to the water supply unit 9 is branched into a first branch water supply channel 11a and a second branch water supply channel 11b via an upstream branch cheese 10 at a midway point. The first branched water supply path 11 a, which is one of the branched water supply paths 11, is inserted from a tank water supply port 12 formed at the lower end of the hot water storage tank 2 and connected to the hot water storage tank 2. Further, the second branched water supply path 11 b that is the other branched water supply path 11 is connected to a location in the middle of the hot water supply path 8 via a mixing valve 14.
[0010]
Further, a third branch water supply path 11 c is branched from a part of the first branch water supply path 11 a via a downstream branch cheese 13. The third branch water supply channel 11 c is connected to a location downstream of the mixing valve 14 and the second mixing valve 16 in the middle of the hot water supply channel 8.
[0011]
A pressure reducing valve 15 is provided at a location in the middle of the water supply channel 11 and upstream of the branch location between the first branch water supply channel 11 a and the second branch water supply channel 11 b provided with the upstream branch cheese 10. Thereby, since all the 1st, 2nd, 3rd branch water supply path 11a, 11b, 11c is located in the downstream rather than the pressure-reduction valve 15, it is supplied via the water supply path 11 from the water supply part 9. The water passes through the pressure reducing valve 15 and is supplied to the mixing valve 14, the second mixing valve 16, and the hot water storage tank 2 while being decompressed.
[0012]
A gas water heater 17 serving as an auxiliary heat source is provided at a location downstream of the second mixing valve 16 in the hot water supply path 8, and the hot water supply path 8 is located further downstream of the gas water heater 17 in the bath 20. It is connected to the discharge unit 18. Further, a location upstream of the pressure reducing valve 15 in the water supply channel 11 and a location sandwiched between the second mixing valve 16 and the gas water heater 17 in the hot water supply channel 8 are directly connected by a supply water supply channel 22.
[0013]
With the above-described configuration, water is supplied into the hot water storage tank 2 from the lower end side through the first branch water supply path 11a of the water supply path 11, and this water is warmed by the heat exchanger 4 as a heat source to enter the hot water storage tank 2. Stored as hot water. Hot water supplied to the outside through the hot water supply path 8 from the upper end side of the hot water storage tank 2 is mixed with water supplied through the second branch water supply path 11b by the mixing valve 16 provided in the middle of the hot water supply path 8. Then, after the hot water temperature is lowered to about 45 ° C., it is supplied further downstream.
[0014]
The second mixing valve 16 and the gas water heater 17 provided downstream of the mixing valve 14 in the hot water supply path 8 are respectively controlled by the controller 19, and when the hot water temperature is higher than the temperature set by the controller 19, the third branch valve is provided. The water supplied through the water supply passage 11c is mixed by the second mixing valve 16 to lower the hot water temperature. When the hot water temperature is lower than the set temperature, the hot water temperature is increased by the combustion heat in the gas water heater 17. Let In addition, when it is desired to supply water from the hot water discharge section 18, the water may be supplied through the direct supply water supply path 22 without going through the hot water storage tank 2.
[0015]
In the hot water supply unit 1 of this example, the upstream and downstream positional relationship between the second mixing valve 16 and the mixing valve 14 may be reversed. In that case, the hot water temperature is about 45 ° C. with the second mixing valve 16. The mixing valve 14 and the gas water heater 17 finely adjust the controller 19 based on the set temperature. In any case, water can be mixed in two stages in the middle of the hot water supply path 8, and further provided with a gas water heater 17 that is an auxiliary heat source, so that the hot water is always supplied at the temperature set by the user. The hot water supply unit 1 is used.
[0016]
Further, the water mixed in the mixing valve 14 or the second mixing valve 16 is required to have the same pressure as the hot water supplied from the hot water storage tank 2, but in this example, as described above, the mixing is performed. Since the water supplied to the valve 14, the second mixing valve 16, and the hot water storage tank 2 passes through the pressure reducing valve 15 and has the same pressure, the above requirement is satisfied.
[0017]
【The invention's effect】
In the invention according to claim 1 as described above, while the supply water to the hot water storage tank and the supply water to the mixing valve can be made to have the same water pressure, the mixing valve can be mixed well, Thus, since only one pressure reducing valve is provided in the water supply channel, there is an effect that it is possible to reduce the labor and cost of installation.
[0018]
In addition, in the invention according to the first aspect, since the mixing of water in the hot water supply passage is performed in two stages, the temperature of the hot water is lowered to about 45 ° C. in the first mixing and then the next mixing is performed. If fine adjustment is performed, there is an effect that it is possible to provide a highly convenient hot water supply unit that can always perform hot water supply at a temperature set by the user.
[0019]
Further, in the invention described in claim 2 , in addition to the effect of the invention described in claim 1, when the hot water temperature is lower than the temperature set by the user, fine adjustment can be performed by the auxiliary heat source. Therefore, there is an effect that the hot water supply unit can be more convenient.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram showing a hot water supply unit using an example solar system according to an embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Hot water supply unit 2 Hot water storage tank 4 Heat exchanger 8 Hot water supply path 9 Water supply part 11 Water supply path 11a First branch water supply path 11b Second branch water supply path 11c Third branch water supply path 14 Mixing valve 15 Pressure reducing valve 16 Second mixing valve 17 Gas Water heater

Claims (2)

A water supply channel with one end connected to the water supply unit is bifurcated in the middle, and one of the branched branches is connected to a hot water storage tank having a heat source inside, and the other branch is connected to one end of the hot water storage tank. In a hot water supply unit formed by connecting a mixing valve in the middle of a hot water supply path, a pressure reducing valve is provided upstream of a branching location of the water supply channel, and a location downstream of the pressure reducing valve of the water supply channel is provided. In addition, the downstream side of the mixing valve of the hot water supply channel is connected to another branch water supply channel, and the second mixing valve is interposed at the connection point of the hot water supply channel and the branched water supply channel. A featured hot water supply unit.   The hot water supply unit according to claim 1, further comprising an auxiliary heat source for temperature adjustment in the middle of the hot water supply path.

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