JPS58104434A - Hot water supply bath unit - Google Patents

Abstract

PURPOSE:To impart energy-saving water supply, instantaneous water supply and hot water storing functions by forming a pump circulating path between a large capacity hot water storage tank and a heat source, disposing a heat exchange for the bath in the return path, and constituting the circulation path by three-way valves in a manner switchable to hot water supply faucet, tank lower part, tank middle part and bath heating. CONSTITUTION:Hot water in a large capacity hot water storage tank 1 circulated by a pump 12 through hot water supply reciprocating pipe 13, heat source 10, threeway switching electromagnetic valve 14, electromagnetic valve 27, hot water supply return pipe 15, orifice part 17 and three-way electromagnetic valve 16. In this case, when by switching the three-way switching electromagnetic valve 16 to communicate an inlet 5 for storing hot water in a large quantity, hot water stored in a large quantity can be obtained, and the three-way valve is communicated with the side of an inlet 6 for storing hot water in a small quantity, hot water stored in a small quantity can be obtained. Further, when the three-way vale 14 is switched to the side of the water supply faucet, the instantaneous hot water supply is started. When the electromagnetic valve 17 is closed in a state where a large quantity of hot water is heated up and hot water is flowed into the heat exchanger 27, additional heating of the bath can be performed. By this construction, a hot water supply bath unit combined with a low-input instantaneous hot water supplier and a large capacity hot water tank, which is energy-saving and convenient for use, can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a hot water bath device that has both hot water storage type and instantaneous type functions, as well as bath reheating and bath residual heat recovery functions.

In general, water heaters can be broadly divided into ``instantaneous type'' and ``storage type.'' If the instant type has a large input capacity type, it can handle the hot water supply load.

You can get hot water instantly. In addition, even if the hot water storage type has a low input capacity, it can store hot water of about 2001 at 80 to 86 degrees.
C. If you store hot water, you can always have a large amount of hot water available. (The hot water supply curve in Figure 2 shows the usage range of instantaneous type and hot water storage type.) The reality is that each type has its own characteristics and is polarized.

In addition, there are drawbacks to both the instantaneous type and the hot water storage type, as shown below.

1. Disadvantages of instantaneous hot water heaters (1) In recent years, hot water supply methods have been increasing in size, with the hot water supply capacity increasing. The capacity of the equipment is 13 to 18 (260oo to 36oo in terms of input).
o1cal/h). Therefore, as the heat exchanger becomes larger and has a larger heat capacity, "startup heating loss" increases.

(2) When used simultaneously under different hot water supply conditions, it is difficult to use because it depends on the condition where the hot water supply capacity is large.

(For example, even if the hot water supply condition in the kitchen is 6β·30'C in the winter (water temperature 6°C) with No. 15 capacity, the hot water supply condition during the bath is 5180'C, etc.).

As described above, the larger the hot water supply capacity, the more disadvantages arise in terms of economy and usability.

2. Disadvantages of hot water storage type water heaters (- (1) When the amount of hot water stored is large and the input capacity is low,
In particular, a long boiling time j1 is required, and if the water is used up in a short time, even if a slightly higher temperature is desired, a large amount must be boiled, and a longer boiling time is required. (Poor response to hot water supply load)
.

(2) Store a large amount of hot water (e.g. 86°C) (e.g. 2
oO4) "Heat radiation loss due to hot water storage"
It's thick.

(3) The installation space is also larger than that of the instantaneous type.

As mentioned above, the hot water storage type also has drawbacks in terms of economy and installation space.

The focus of the present invention is on this point, and takes advantage of the features of the instantaneous type and hot water storage type to solve the drawbacks of both types. In other words, the present invention combines a low-input capacity (125007/h or less) pre-start instant hot water heater with a hot water storage tank that can store a large capacity (for example, 2601), and also has a bath reheating function and a bath remaining water heater. This is a new hot water bath equipment with added hot water heat recovery function, and aims to realize the following points.

, 1+'1・1 (1) Energy saving and improved usability, """"
``''''1lk (2) Space saving This will be explained in detail as follows.

(1) The heat source capacity will be an instant water heater with low input. Therefore, it is possible to reduce the heating loss during the rise. At the same time, by being able to switch between storing a large amount of hot water and storing a small amount of hot water, it becomes possible to operate the system to boil the required amount. Therefore, heat radiation loss caused by storing a large amount of high-temperature hot water can be minimized.

(2) By providing a bath reheating circuit in the hot water storage circuit, a bath water heating (reheating) function is added. Therefore, the hot water temperature in the hot water storage tank should be set low (for example, 50 to 60 degrees).
C) It is possible to reduce heat radiation loss.

(Conventionally, there is no reheating function for the bath, so it is generally set at 80 to 86°C as mentioned above.) (3) Can be used at the same time by combining it with a hot water storage tank to create a hot water storage type water heater. becomes.

(4) By switching the hot water storage method between a large amount of hot water storage and a small amount of hot water storage, it becomes possible to cope with the hot water supply load, which is a drawback of the hot water storage method.

(6) By making the hot water storage tank a system with a distern, the influence of water pressure is extremely reduced, and by making the cross section rectangular, it is possible to achieve slimming down and construct a space-saving hot water storage tank.

(6) By separating the hot water storage tank and the heat source, the above-mentioned functions can be achieved while providing freedom of installation.

(7) By switching the outlet of the hot water storage tank to the lower part and operating it, the system recovers the residual hot water heat to the hot water storage tank in the heat exchanger part of the bath, resulting in energy savings.

As mentioned above, the heat source and hot water storage tank may be separated, and this is an energy-saving type hot water bath that has an instant stop function, a hot water storage function, and a reheating function for the bath.It also has a function to recover heat from the remaining water in the bath. The system has extremely high practical value.

Embodiments of the present invention will be described based on FIGS. 1 to 8.

1 is a hot water storage tank with a ball tap 3 directly connected to tap water 2 at the top
It is equipped with 4 is a water supply pipe connected to the ball tap 3 and extends into the lower part of the hot water tank 1.

Further, the hot water storage tank 1 is provided with an inlet portion 5 for storing a large amount of hot water at the lower part thereof, and an inlet portion 8 for storing a small amount of hot water approximately at the upper part thereof.

It has an outlet section 7 at the top.

Reference numeral 8 denotes a hot water temperature stabilizing tube provided in the hot water storage tank 1 at the tip of the small amount hot water storage inlet section 6, and is provided with a plurality of small holes 9 for distributing the hot water, and is located in the horizontal direction within the hot water storage tank 1.

1o is a heat source part, and the inlet side of the heat exchanger 11 is the hot water storage tank 1
A hot water supply and circulation pump 12 directly connected to the outlet 7 of the hot water supply system is connected by a hot water supply outgoing pipe 13.

Further, the outlet side of the heat exchanger 11 is connected to a three-way switching section 14 and communicated with a three-way switching solenoid valve 16 via a hot water return pipe 16 .

Reference numeral 17 denotes an orifice portion for controlling the amount of circulation provided between the hot water return pipe 16 and the three-way switching solenoid valve A16.

The inlet section 5 for storing a large amount of hot water and the inlet section 6 for storing a small amount of hot water are controlled by a three-way switching solenoid valve 16.

The hot water supply faucet 18 and the hot water supply return pipe 15 are controlled by a three-way switching section 14. 19 is a hot water control thermistor, 20 is a flow rate switch, and 21 is a flow rate switch B.

22 is a main body case of the hot water storage tank 1, 23 is a main body case of the heat source section 10, 24 is a burner of the heat source section, and 26 is a connection part between the hot water supply pipe 13 and the hot water return pipe 15 on the hot water storage tank side 1 and the heat source side 1o. be.

In the above basic configuration, a bath heat exchanger 26 and a solenoid valve 27 are arranged in parallel between the three-way switching section 14 and the orifice section 17. 28 is a small amount of hot water storage tank having an inlet vibe 30 and an outlet vibe 31 of the bathtub 29.

32 is a three-way switching solenoid valve B connected to the pump 12 for both hot water supply and circulation;
The other side is connected to an outlet section 33 provided at the lower part of the hot water storage tank 1.

Next, we will describe the operations (effects) in the case of large amount hot water storage, small amount hot water storage, instant type, bath reheating, and recovery of residual hot water heat in the bath.

1. In the case of storing a large amount of hot water, when the hot water storage tank is filled with water, turn on the operation switch (not shown), and the hot water supply/circulation pump will operate. Then, the burner of the heat source is turned on by signals from the flow rate switch B and the hot water temperature control thermistor, and the water is heated by the heat exchanger.

The heated hot water passes through the hot water return pipe, a three-way switching solenoid valve, and is sent from the lower part of the hot water storage tank.

In this case, a heat exchanger for the bathtub is installed on the hot water return pipe side. Therefore, in order to prevent heat loss from occurring in this part,
A bypass solenoid valve is installed to utilize the resistance difference in the circuit.

After that, when the hot water temperature control thermistor reaches the set hot water temperature, the burner is stopped and heating is completed.

In this state, when the hot water tap is opened, the hot water supply/circulation pump will pump out a large amount of hot water at full capacity upon detection of the flow rate switch being turned on.

In this case, the absolute requirement for hot water supply performance is to eliminate the hot water temperature distribution in the hot water storage tank and to obtain a uniform hot water temperature (for example, FIG. 4) when hot water is tapped.

According to the experimental paper, this condition can be met.

It is desirable that the circulating flow rate into the hot water storage tank is low and that the hot water is high temperature, and that the ratio of stable hot water temperature to the capacity of the hot water tank (effective stable hot water output and general hot water) is It was found that a large amount of 1° can be obtained.

Therefore, it is desirable to have a high flow rate when supplying hot water, and since a single pump is used for both supplying and circulating hot water, an orifice is provided to control the amount of circulation.

This is because hot water is boiled from the lower part of the hot water storage tank at a slow convection speed, so that the temperature distribution inside the hot water storage tank is reduced as shown in Figure 3.

As shown in Fig. 4, the temperature of the hot water can be stabilized when hot water is tapped.

2. In the case of storing a small amount of hot water This corresponds to cases where the hot water in the large amount of hot water storage is used up, or when only a small amount of hot water is to be stored, and the three-way switching solenoid valve is switched to the inlet for storing a small amount of hot water.

The flow behavior is the same as in the case of storing a large amount of hot water.

In the case of storing a small amount of hot water, it is necessary to stabilize the hot water temperature when hot water is released, just as in the case of storing a large amount of hot water. The device of the present invention is provided with an artificial part for storing a small amount of hot water in order to obtain hot water in small quantities and in a short period of time. but,
Some ingenuity is required here.

That is, if high-temperature hot water is simply pumped in intensively, a deflected flow will occur from the inlet toward the outlet, resulting in poor temperature distribution and a lack of stability during tapping.

This is shown in FIGS. As in the embodiment, by dispersing high-temperature hot water and sending it downward from the small hole at a low flow rate, a predetermined amount of high-temperature hot water can be stored from near the inlet for storing a small amount of hot water.

Moreover, it is possible to stabilize the temperature of the hot water at the time of tapping, which has a small temperature distribution. This is clear from FIGS. 7 and 8.

In other words, it is not possible to simply pump high-temperature water in a concentrated manner.
) is not obtained, so at the inlet for storing a small amount of hot water into the hot water storage tank,
Conversely, it becomes necessary to set the position to around 70 to aol, for example.

As a result, a stable hot water temperature can be obtained.Thus, as shown in Fig. 6, the time required to reach the temperature is fast, but it would take longer to obtain the same stable hot water temperature. become unable to achieve.

When storing a small amount of hot water, it will be heated in the same way as when storing a large amount of hot water, and the burner will stop when the hot water temperature control thermistor reaches the set temperature (for example, 60"C). If you open the hot water tap in this state, the hot water will come out. Stable, high-temperature hot water can be obtained using the full capacity of the hot water supply and circulation pump.

In this case, if you leave the operating switch (not shown) in the OFF state, the hot water will be used up, but if you leave the operating switch in the ON state, when a certain amount of hot water is used up, if the hot water is being dispensed, the heat source will Furthermore, high-temperature water (e.g. 60'C)
If the inlet water temperature is 121/min, it can be heated up to 72.6°C. ) If the hot water is not in use, the amount of hot water used will be reheated.

3. In the case of an instant water heater When a large amount of hot water is required, such as on days when bathing is not done or in midsummer, an instant water heater has a low capacity. Therefore, in case 3, the method is to use it as an instant water heater.

Therefore, when the operation switch is turned on and the hot water tap is opened, the hot water supply/circulation pump starts when the flow switch is detected by the operator. Then, the water temperature in the hot water supply outgoing pipe is detected, and the burner is ignited by a signal from the hot water temperature control thermistor. After a while in this state, you will be able to get hot water from the hot water tap.

At this time, it functions as an instant water heater.

4. When reheating a bath (1) Reheating a bathtub by pouring hot water into the bathtub, pouring high-temperature water into the bathtub has a heavy hot water supply load;
The operation sequence involves storing a large amount of hot water and boiling it up. If there is a large amount of hot water in the hot water storage tank, it will fall into the bathtub.

However, although the water temperature at the bottom of the hot water storage tank is high, there is still plenty of hot water at the top. Let's talk about reheating in this state. In the hot water flow circuit for reheating, high-temperature hot water is sent by a pump from the outlet in the hot water storage tank. At this time, since the hot water is high 4, the control thermistor detects that the burner in the heat source section is not ignited, but passes through the three-way switching section, passes through the bath heat exchanger, and then passes through the three-way switching solenoid valve to the small amount storage inlet. come back to.

This circulation circuit performs indirect heat exchange in a small amount of hot water storage tank directly connected to the bathtub to reheat the bathtub.

Also, naturally, the solenoid valve is in an off state.

This solenoid valve was installed because heat radiation loss increases when the bath passes through the heat exchanger during normal heating other than reheating, and is turned on and off according to various functions.

(2) We will discuss reheating when the bathtub is filled with water and when there is no hot water in the hot water storage tank (or when there is no hot water stored).

In this case, the flow circuit is the same as in (1) above, but heating is performed by combustion in the burner of the heat source section as detected by the control thermistor. After that, high-temperature hot water is stored in the upper part of the hot water tank. Therefore, after high-temperature hot water is stored, the heating mode described in (1) is used.

As is clear from (1) and (2) above, by providing a small amount hot water storage circuit in a high-volume hot water storage type and combining the bath reheating system, the hot water storage function and reheating function are the same. This was realized using a circuit.

6. In the case of recovering heat from remaining hot water in a bath Usually, when heat is recovered from a bath, either the high-temperature hot water in the hot water storage tank is used up, or a small amount of high-temperature hot water remains at the top. The operation under this condition will be described.

Water temperature is sucked from the lower part of the hot water storage tank and pumped into the bath heat exchanger section via the heat source section.

At this time, the hot water exchanges heat with the remaining hot water in the bathtub and is sent to the large quantity storage inlet of the three-way switching solenoid valve A.

This circulating circuit recovers the residual heat from the bath water to the lower part of the hot water storage tank.

The key points in this case are that it takes into account the possibility that high-temperature hot water remains at the top of the hot water storage tank, and that the burner circuit in the heat source section is turned off when recovering the residual water heat, and the solenoid valve is turned off. This is a combination of control points.

The following are the views on energy conservation.

For example, if the amount of heat for boiling is 15.0OO1al and the thermal efficiency is 86%, the amount of exhaust heat lost is 2647 degrees.

In this case, when calculated from heat recovery efficiency, pump operating heat amount, and heat radiation amount by piping, the average is 18oo to 21oo.
17 corresponds to 10 to 12%. Simply converting it into thermal efficiency, it is 96 to 97 inches (conventionally, the thermal efficiency was about 80 inches at best).The present invention uses a low input capacity pre-stop instant water heater and a bath heat exchanger. To create a hot water bath device that satisfies the instantaneous hot water storage type, bath reheating function, and bath residual hot water recovery function by combining separate hot water storage tanks that can store a large amount of hot water and a small amount of hot water. The following effects can be obtained.

(1) Low input capacity requires less heat exchange capacity, reduces start-up heating loss, and enables operation to boil the required amount.

This is an extremely economical hot water bath system that reduces heat radiation loss.

(2) A bath heat exchanger is installed in the hot water storage circuit, and by controlling the combination of a small amount of hot water storage inlet and a solenoid valve, it is possible to reheat the bath, making it possible to set the hot water temperature in the hot water storage tank to a low value. This is an extremely economical hot water bath system that reduces heat loss from the tank.

(3) By being both a hot water storage type and an instantaneous type, it can be used simultaneously and can handle hot water supply loads, greatly improving usability.

(4) By using a hot water storage tank with a distern, the influence of water pressure can be minimized, making it possible to realize a space-saving hot water storage tank.

(6) To provide a low-cost hot water bath system that can serve the functions of instantaneous hot water, large amount hot water storage, small amount hot water storage, and bath reheating by controlling the orifice and solenoid valve with one pump. I can do it.

8 (6) When supplying hot water and storing hot water, the circuit uses a pump to pump water from the upper outlet of the hot water storage tank, whereas the circuit uses a pump to pump water from the lower outlet of the hot water storage tank to recover the heat from the remaining water in the bath. This is a hot water bath device that is extremely energy efficient.

[Brief explanation of drawings]

FIG. 1a is a configuration diagram of a hot water bath device according to an embodiment of the present invention,
Figure 1 is a top view of the hot water storage tank, Figure 2 is a performance diagram showing the usage range of instantaneous type and hot water storage type, Figure 3 is a boiling performance diagram for the same large amount of hot water storage, and Figure 4 is the same large amount of hot water storage. Figure 6 is a boiling performance diagram for a configuration with the same amount of hot water storage, Figure 6 is a diagram of hot water output performance for a configuration without any innovation when storing the same amount of hot water. , FIG. 7 is a boiling performance diagram for the same amount of hot water storage, and FIG. 8 is a hot water discharging performance diagram for the same amount of hot water storage. 1...Hot water tank, 3...Ball tap,
5... Inlet part for large amount hot water storage, 6... Inlet part for small amount hot water storage, 7... Outlet part, 8...
Hot water temperature stabilizing pipe, 9...Small hole part. 10...Heat source part, 12...Hot water supply and circulation pump. 19 13... Hot water supply outgoing pipe, 14... Three-way switching section, 16... Hot water returning pipe, 16... Three-way switching electromagnetic Japanese person. 17... Orifice part, 18... Hot water tap, 19... Control thermistor, 20...
・Flow rate switch A121...Flow rate switch B,
26... Bath heat exchanger, 27... Solenoid valve, 28... Small amount hot water storage tank, 32...
Three-way switching solenoid valve B, 33...Exit part. Name of agent: Patent attorney Toshio Nakao and one other person JP-A-58-104434 (6) 2nd power σ enthusiastic shout! WI (Example: Figure 4 Yamadori 11jj-F5 (Example: Figure 6)

Claims (1)

[Claims] (1) Separating a hot water storage tank having distern and a heat source,
A large quantity hot water storage inlet is connected to the lower part of one side of the hot water storage tank via a first three-way switching solenoid valve, a small quantity hot water storage inlet is located approximately at the middle upper part, and the outlet parts at the upper and other lower parts are directly connected to a second three-way switching solenoid valve. The circuit has a circuit configuration, and a pump, a heat source section, a three-way switching section, and a bath heat exchanger are arranged in the circuit from the second three-way switching solenoid valve to the first three-way switching solenoid valve. A hot water bath device in which the other side of the three-way switching section is connected to a hot water faucet.翰) An orifice part is provided on the downstream side of the first three-way switching solenoid valve, or voltage control is used to supply hot water. The hot water bath device according to claim 1, wherein the pump flow rate is controlled during hot water storage circulation, when reheating the bath, and when recovering residual hot water heat in the bath. (3) The hot water bath apparatus according to claim 1, wherein a bath heat exchanger and a solenoid valve are arranged in parallel between the three-way switching section and the first three-way switching solenoid valve.