JPH0338511B2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field A water heater that combines an instantaneous water heater and a forced circulation bath pot, which injects a large amount of hot water obtained from the instantaneous water heater into the bathtub through the circulation circuit of the bath pot. This enables automatic operation from the start of boiling and pouring to the stop of pouring.

Conventional configuration and its problems Conventionally, this type of composite water heater has a configuration that performs hot water supply function and bath reheating function, and a typical example is shown in Fig. 1. The instantaneous water heater 1 consists of an instantaneous water heater burner 2 and an instantaneous water heater heat exchanger 3, and the tip of the outlet side 4 of the instantaneous water heater heat exchanger 3 is connected to hot water taps 5a and 5b by hot water supply pipes 6a and 6b. I'm in touch. Next, the bathtub 7 consists of a bathtub burner 8 and a bathtub heat exchanger 9, and the outlet side 10 of the bathtub heat exchanger 9 is connected to the bathtub 12 via an outgoing pipe 11, and the inlet side A forced circulation pump 14 is disposed at 13 and communicates with the bathtub 12 via a return pipe 15. A combined water heater with this configuration can function as an instantaneous water heater and a bath pot at the same time, and because it uses forced circulation heating to reheat the bath, the appliance can be installed in a location away from the bathtub (installation-free type). ), but it has the following drawbacks.

When pouring an appropriate amount of hot water obtained from an instantaneous water heater into the bathtub, it is poured into the bathtub from the hot water tap 5b near the bathtub with the lid of the bathtub open, resulting in large heat radiation loss and energy saving. Nakatsuta. Furthermore, when the lid of the bathtub is closed, a large amount of hot water obtained from an instantaneous water heater is automatically poured into the bathtub, and when an appropriate amount of hot water is poured into the bathtub, instant hot water is automatically poured. There is a drawback that the boiler cannot be stopped.

Purpose of the Invention The object of the present invention is to allow hot water at an appropriate temperature obtained by an instantaneous water heater to be poured into the bathtub with the lid closed, and to use a forced circulation heating path for reheating the bath. By using a pair of tubes with a return pipe and a return pipe, it is possible to pour a large amount of hot water into the bathtub from both the forward and return pipes in a short time, and the pouring can be started and stopped automatically. That's true.

Composition of the Invention The present invention is a water heater that combines an instantaneous water heater and a forced circulation heating bath pot, in which a return pipe is installed from approximately the bottom of the bathtub.
A circulation pump, a heat exchanger for the bathtub, and a check valve for directing water from the heat exchanger for the bathtub toward the bathtub are arranged in this order, and are connected to a substantially lower part of the bathtub by an outgoing pipe,
The forced circulation heating bathtub is equipped with a bypass pipe having an on-off valve A for the incoming and outgoing pipes between the circulation pump and the bathtub, and the outlet side of the instantaneous water heater is branched, with one connected to the hot water tap and the other connected to the hot water tap. The on-off valve B, the water amount sensor, and the separation means are arranged in this order, and the pouring pipe at the tip is connected to the outgoing pipe between the check valve and the bypass pipe.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of the present invention will be described based on FIG. 2. In FIG. 2, parts that are the same as those in FIG. 1, which is a conventional example, are given the same numbers.

In FIG. 2, the instantaneous water heater 1 consists of an instantaneous water heater burner 2 and an instantaneous water heater heat exchanger 3, and one of the outlet sides 4 of the instantaneous water heater heat exchanger 3 is connected to the other end of the instantaneous water heater through a hot water supply pipe 6a. The other valve is connected to the hot water tap 5a, and the other is connected to the hot water pouring pipe 19, which is provided with an on-off valve B16, a vacuum breaker valve 17 serving as separation means, and a check valve B18 in this order.

The bathtub consists of a bathtub burner 8 and a bathtub heat exchanger 9, and the inlet side 13 of the bathtub heat exchanger 9 is connected to a return pipe 15 and a circulation pump 14 from approximately the bottom of the bathtub 12.
The outlet side 10 includes a check valve A20 for flowing hot water from the bathtub heat exchanger 9 to the bathtub 12;
The outgoing pipes 11 are arranged in this order and communicated with the other substantially lower part of the bathtub 12 to form a circulation path.

This bathtub has a circulation pump 14, and has the advantage that it is not necessary to install the bathtub near the bathtub 12 and can be installed at a remote location. For this purpose, the bathtub and the bathtub 12 are connected by an adjacent pair tube between an outgoing pipe 11 and an incoming pipe 15.

This pair of tubes can be easily bent even at a location with a difference in height when the bathtub is installed in a location away from the bathtub 12, and it also reduces the heat loss that is radiated from the surfaces of the outgoing pipe 11 and return pipe 15 during circulating heating of the bath. In order to reduce the amount of water, the cross-sectional area is made smaller than that of the hot water supply pipe 6a, and it is covered with a heat insulating material (not shown).

Normally, forced circulation type bathtubs using pair tubes are often spaced 15 to 20 meters apart from the bathtub 12 to take advantage of the freedom of installation.

In the above basic configuration, a bypass pipe 22 having an on-off valve A21 is provided between the return pipe 15 between the circulation pump 14 and the bathtub 12 and the outgoing pipe 11 on the upstream side of the check valve A20, and a molten metal pouring pipe 19 is provided. The tip of the valve is connected between the check valve A20 and the bypass pipe 22. Further, the water amount sensor 23 is connected to the on-off valve B1.
6 and the vacuum breaker valve 17. bathtub 12
The incoming pipe 15 and the outgoing pipe 11 which are connected to each other are a circulation circuit and have a smaller diameter than the hot water supply pipe 6a. Also,
The combined water heater is installed at a higher position than the bathtub 12.

Next, we will discuss the operational aspects of instantaneous water heaters and bathtubs.

(1) For normal hot water supply The desired hot water obtained by the instantaneous water heater is supplied to the hot water pipe 6.
The hot water is sent out from the hot water taps 5a and 5b at the tips through the hot water taps 5a and 6b. At this time, the on-off valve B16 is in a closed state.

(2) In the case of normal bath reheating The bathtub starts combustion by operating the circulation pump 14 while the bathtub is filled with water, and the water in the bathtub is transferred to the outgoing pipe 11, the bathtub 12, and the return pipe. It is heated to an appropriate temperature while being forcedly circulated in the order of tube 15. At this time, the on-off valve A22 and the on-off valve B16 are in a closed state.

Also, during circulation, the circulating hot water is prevented from being sent from the pouring pipe 19 toward the vacuum break valve 17.
A check valve B18 is provided.

(3) When pouring water at the appropriate temperature into the bathtub When pouring water at the appropriate temperature into the bathtub, open/close valve B1
6. The on-off valve A21 is open, and the hot water obtained from the instantaneous water heater flows through the on-off valve B16 and the water flow sensor 2.
3. The molten metal is sent into the outgoing pipe 11 through the vacuum break valve 17 and the pouring pipe 19, and is also sent from the return pipe 15 through the bypass pipe 22 via the on-off valve A21. In other words, the water is sent into the bathtub from both the outgoing pipe 11 and the returning pipe 15 of the paired tubes.

The diameter of the pair tube is limited by the degree of bending of the tube, and it is difficult to increase the diameter. Therefore, even if it is desired to increase the flow rate under a constant pressure, the flow path pressure loss within the pipe increases and it is extremely difficult to achieve this.

As a specific example, the distance between bathtub 12 and bathtub is 15m.
(length of pair tube) and water pressure is standard 1
Based on experience, the flow rate is 12~13/kg/ ^cm2 .
It is about min. Connecting this to the hot water supply capacity of the equipment, the water temperature is 20℃, the hot water temperature is 45℃, and the flow rate is 20℃.
If it is 13/min., the hot water supply capacity will be No. 13.

On the other hand, there is a demand for shortening the time required to fill the bathtub 12 with hot water.

To cope with this, it is necessary to increase the hot water supply capacity. Now, suppose the hot water supply capacity is 13 and 45℃.
(25deg) of hot water is pumped into the bathtub at a rate of 13/min.
= 126) of hot water can be pumped in. If the hot water supply capacity is set to 22, it will reach 45 degrees Celsius.
If hot water (25 degrees) is pumped into the bathtub at 22/min., the bathtub will be completely filled in about 6 minutes, making it extremely quick.

However, if the outgoing pipe 11 of the pair tubes is used to feed hot water, it is only possible to feed hot water at a rate of about 13/min due to pressure loss, so increasing the hot water supply capacity has no effect.

Therefore, we came up with a configuration that utilizes both the outbound and return tubes of a pair of tubes. If this is the case, it will be possible to use two lines and about 22/min.

From the above, the bypass pipe 22 and the on-off valve A2
By adding a new bathtub 1, a large amount of hot water can be added to the bathtub 1.
It became possible to send it to 2.

Further, in this case, when the appropriate amount of hot water has been poured into the bathtub, the on-off valve B16 is closed to stop pouring the hot water.

This is done by detecting the flow rate per minute with the water flow sensor 23, and calculating the amount of water to be poured in by measuring the time using a microcomputer (not shown).
When the predetermined drop amount is reached, the on-off valve B1
6 and sends a signal to stop. Open/close valve B1
By closing the valve 6, air is taken in from the vacuum break valve 17 and mixed into the pouring pipe, thereby preventing the hot water in the bathtub from flowing back toward the instantaneous water heater.

Furthermore, by providing the check valve A20 in the circulation circuit, some of the hot water is sent to the heat exchanger 9 of the bath pot when pouring, causing heat radiation loss, which makes automation difficult because the temperature drops below a predetermined level. It is something to be solved.

For example, as shown in FIG. 2, when feeding hot water at a predetermined temperature into the bathtub 12 from the pouring pipe 19, which is one outlet pipe of an instantaneous water heater, through the outgoing pipe 11 of the paired tubes 11 and 15, The temperature inside bathtub 12 is 43℃
If you want to obtain a temperature of about 45℃, taking into account the heat radiation loss of the pair tubes 11 and 15 and the heat radiation loss inside the bathtub 12.
Experience has shown that when water is pumped in, the temperature reaches approximately 43℃. However, without the check valve A20, some of the water would flow through the heat exchanger 9 side of the bathtub and be sent from the return pipe 15 of the paired tube, causing the heat exchanger 9 to flow.
The temperature is lowered by cooling. As a result, it becomes impossible to obtain a predetermined temperature, and it becomes unclear at what temperature the hot water should be fed in order to achieve the desired temperature in the bathtub, making automation difficult.

With the above configuration, it is possible to send a large amount of hot water at an appropriate temperature obtained by the instantaneous water heater into the bathtub through the forced circulation heating circuit of the bathtub.

As shown in one embodiment of the present invention, the bypass pipe 2
2 and on-off valve A21 to open the outgoing pipe 11 of the circulation heating circuit.
By adopting a configuration in which the water is fed from both the and return pipe 15, the flow rate can be increased.

Furthermore, when pouring hot water into the bathtub, the amount of hot water poured into the bathtub can be detected by the water flow sensor, so that pouring can be automatically stopped after pouring has started.

Effects of the invention (1) It is possible to send hot water at an appropriate temperature obtained by an instantaneous water heater through the circulation heating circuit of the bathtub, and it is possible to pour hot water with the lid of the bathtub closed, making it possible to achieve energy-saving hot water pouring. .

(2) The hot water at an appropriate temperature obtained by the instantaneous water heater is passed through both the outgoing and returning pipes of the bath circulation heating circuit (in this case, both pipes act as the outgoing pipes. In other words, when circulating (It is a return pipe, but when pouring water it becomes an outgoing pipe.) By combining the bypass valve and check valve A, a large amount of hot water can be sent into the bathtub. This allows for hot water to be filled in a short time.

(3) After pouring has started, the water flow sensor can be used to measure the amount of water that has fallen into the pot, allowing the pouring to be automatically stopped once the appropriate amount has been poured, greatly improving convenience.

(4) By installing check valve A in the circulation heating circuit and connecting the hot water pouring pipe to the outgoing pipe between the check valve A and the bypass pipe, hot water from the hot water pouring pipe is directed to the heat exchanger side of the bath. Since the water does not flow, the temperature of the water sent into the bathtub can be kept constant. Only through this can automation be realized.

[Brief explanation of the drawing]

FIG. 1 is a diagram illustrating the principle of a conventional hot water bath system, and FIG. 2 is a diagram showing the principle configuration of a hot water bath system according to an embodiment of the present invention. 16... Open/close valve B, 17... Vacuum breaker valve, 18... Check valve B, 20... Check valve A, 21... Open/close valve A, 22
...Bypass pipe, 23...Water flow sensor.

Claims (1)

[Claims] 1. Arranged in this order from approximately the bottom of the bathtub: a return pipe, a circulation pump, a heat exchanger for the bathtub, a check valve that directs water from the bathtub heat exchanger toward the bathtub, and an outflow pipe connected to the substantially bottom of the bathtub. A circulation path is provided which returns to a substantially lower part of the bathtub, and the return pipe and the outgoing pipe between the circulation pump and the bathtub are communicated with each other by a bypass pipe having an on-off valve A. The outlet side is branched, one side is communicated with the hot water tap, and the other side is arranged in this order: an on-off valve B, a water flow sensor, and a separation means, and the hot water pouring pipe at the tip is connected to an outgoing pipe between the check valve and the bypass pipe. Hot water bath equipment.