JPH0674563A - Water heater - Google Patents

Abstract

(57) [Summary] [Purpose] An object of the present invention is to provide a hot water supply device that can maintain the hot water supply function of immediate hot water even when low temperature water is dropped into the bathtub or automatic drop operation is performed at a temperature lower than the hot water set temperature. And [Structure] For the basic hot water supply passage that guides the water from the water inlet passage 1 to the heat exchanger 2 and heats it to the hot water outlet passage 3, branching from the middle of the water inlet passage 1 to the middle of the hot water outlet passage 3 To the water short-circuit path 4, and the water short-circuit path connection point of the hot water discharge path 3
A bath drop-in path 5 branching from a downstream side of 4b and a water drop path connecting point 4b of the hot water outlet path 3 branching from a downstream side and connecting to a downstream side of a water short-circuit path branch point 4a of the inflow path 1. In the hot water supply apparatus having the hot water return passage 6 for immediate hot water discharge with the pump 7, another water supply passage 17 is provided in the water inlet passage 1.
The water short-circuit path was branched from upstream of the branch point 4a and was connected to the bath drop path 5 via a three-way switching valve 18 in the middle thereof.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot water supply apparatus having an immediate hot water discharge function and a bath drop function.

[0002]

2. Description of the Related Art FIG. 3 shows the structure of a conventional water heater of this type. The water that has entered the water inlet 1 is heated by the heat exchanger 2 and is discharged to the hot water outlet 3. The water inlet passage 1, the heat exchanger 2, and the hot water outlet passage 3 form a basic hot water supply passage. The heat exchanger 2 is heated by, for example, a gas burner. A water short circuit 4 is branched from the middle of the water inlet 1 and connected to the middle of the hot water outlet 3. Connection point 4b of the water short-circuit path 4 of the hot water discharge path 3
A bath drop-in path 5 branches off from. Further, the hot water return path 6 for immediate hot water branches from a position downstream of the connection point 4b of the water short-circuit path 4 of the hot water exit path 3, and the hot water return path 6 for immediate hot water discharge is provided.
Is connected to a position downstream of the branch point 4a of the water short circuit 4 of the water inlet pipe 1. The hot water return pipe 6 for prompt hot water is provided with a circulating pump 7 for quick hot water. Reference numerals 8 and 9 are flow control valves, respectively.
10 is a hot water supply curran. The bath drop-in path 5 passes through the drop-in on-off valve 11 and the check valve 12, and then the bath reheating circulation path.
Connected to 13. 14 is a bathtub, 15 is a reheating circulation pump,
16 is a heat exchanger for reheating.

The instant hot water function is provided by the circulating hot water circulating pump 7 described above.
Is driven, the hot water heated in the heat exchanger 2 is circulated from the hot water outlet pipe 3 through the hot water return passage 6 for immediate hot water circulation to the hot water inlet pipe 1, and is always kept at a predetermined temperature. . When hot water supply scallop 10 is opened in such a situation, appropriate temperature water is immediately discharged at the preset hot water supply temperature. On the other hand, by opening the drop opening / closing valve 11, it can be dropped into the bathtub.

[0004]

However, in the above-mentioned conventional hot water supply apparatus, during the operation of the immediate hot water discharge function, the operation of dropping the low temperature water into the bathtub or the automatic dropping operation below the hot water supply set temperature is started. Then, since the flow rate control valve 9 of the water short circuit 4 is opened, the low temperature water circulates not only from the bath dropping path 5 but also from the water short circuit 4 to the hot water discharge path 3 and the immediate hot water return path 6. As a result, the hot water temperature for hot water is lowered, and there is a drawback that the function of hot water is lost.

Therefore, the present invention solves the above-mentioned drawbacks of the prior art, and is capable of maintaining the hot water supply function of immediate hot water even when the low temperature water is dropped into the bathtub or the automatic hot water drop operation is performed at a temperature lower than the preset hot water supply temperature. For the purpose of providing.

[0006]

In order to achieve the above object, the hot water supply apparatus of the present invention is directed to a basic hot water supply passage for guiding water from an inlet water passage to a heat exchanger and heating the water to the hot water discharge passage. , A water short-circuit path branched from the middle of the water inlet path and connected to the middle of the hot water outlet path, a bath drop-in path branched from a downstream side of the water short circuit path connection point of the hot water outlet path, and the same of the hot water outlet path In a hot water supply device having a hot water return path for immediate hot water discharge with a pump, which branches from a downstream side of the water short circuit connecting point and is connected to a downstream side of the water short circuit branch point of the water inlet path, It is characterized in that it is branched from the upstream side of the water short circuit branch point of the entry water channel and is connected to the bath dropping path through a three-way switching valve.

[0007]

According to the features of the present invention, when the low temperature water is dropped into the bathtub while the hot water supply function of the water heater is operating, another water supply path is connected to the bath drop path by switching the three-way switching valve. As a result, low-temperature water is introduced into the bath drop path directly from the water entrance path without passing through the hot water exit path, and is dropped into the bathtub. Since the water short circuit is not opened, the low temperature water does not mix with the hot water circulated for immediate hot water discharge, and the temperature of the circulating hot water cannot be lowered. When the hot water supply function of the water heater is in operation, when hot water with a temperature lower than the hot water supply temperature for immediate hot water but higher than the low temperature water from the water inlet pipe is automatically dropped into the bathtub, the three-way switching valve should be placed halfway. The temperature is adjusted by switching the low temperature water from the other water supply channel and the hot water of the set temperature for hot water supply from the hot water outlet before and after. In this case as well, the water short circuit is not opened, so the low temperature water does not mix with the hot water for immediate hot water discharge, and the temperature does not drop.

[0008]

1 is a block diagram showing an embodiment of a hot water supply apparatus of the present invention, and FIG. 2 is a view for explaining switching of a three-way switching valve.

[0009] A basic hot water supply passage is constituted by the water inlet passage 1, the heat exchanger 2 and the hot water outlet passage 3. A water short circuit passage 4 is branched from the middle of the water inlet passage 1 and connected to the middle of the hot water outlet passage 3, 3, the bath drop path 5 branches from the water short circuit 4 connection point 4b, and the hot water return path 6 for immediate hot water branches from a position downstream of the water short circuit 4 connection point 4b of the hot water discharge path 3 to immediately discharge hot water. The hot water return passage 6 is connected to the water inlet pipe 1 at a position downstream of the branch point 4a of the water short-circuit passage 4. Further, the hot water return pipe 6 for immediate hot water is provided with a circulation pump 7 for immediate hot water, and a flow control valve 8,
9, hot water supply curran 10, drop opening / closing valve 11, check valve 12, bath reheating circulation path 13, bathtub 14, reheating circulation pump 15,
A heat exchanger 16 for reheating is provided. The above configuration is the same as the conventional one. The bath drop path 5 is a connection point 4b.
You may branch from the hot water discharge path 3 further downstream.

In the present invention, another water supply passage 17 is provided,
This is branched from the upstream side of the water short circuit branch point 4a of the water inlet path 1 and is connected to the middle of the bath drop path 5 via the three-way switching valve 18. In the case of the hot water supply independent operation, the three-way switching valve 18 is provided with another water supply path as shown in FIG.
By connecting 17 and the bath drop path 5 and driving the circulation pump 7 for immediate hot water circulation, hot water can be circulated and an immediate hot water function can be obtained. Further, when the switch for dropping the low temperature water into the bathtub 14 is turned on during the operation of the immediate hot water discharge function, the three-way switching valve 18 causes the other water supply passage 17 and the bath dropping as shown in FIG. 2 (A). The low temperature water is connected to the channel 5 and the drop opening / closing valve 11 is opened, so that the low temperature water passes through another water supply channel 17 from the bath drop channel 5 to the bathtub.
It is dropped to the 14 side. The flow control valve 9 of the water short circuit 4 is not opened. Also, when the automatic drop switch to the bathtub 14 is turned on while the immediate hot water function is operating, first, if the bath set temperature exceeds the hot water supply set temperature, the three-way switching valve
As shown in FIG. 2B, 18 is another water supply channel 17
Then, the hot water having the set temperature for hot water supply is dropped from the hot water supply path 3 through the bath drop path 5 from the hot water supply path 3, and thereafter, the bath water is circulated and reheated to the set temperature by the reheating heat exchanger 16. On the other hand, when the bath set temperature is lower than the hot water supply set temperature, the three-way switching valve 18
First, in the state shown in FIG. 2A, an appropriate amount of low temperature water is dropped through another water supply passage 17, and then the three-way switching valve 18 is brought into the state shown in FIG. 2B, where hot water is supplied at the hot water supply set temperature. Through the hot water passage 3. At this time, if the bath temperature is higher than the bath set temperature, the temperature is set to (A) again and the low temperature water is dropped. If the bath temperature is lower than the set bath temperature, reheating is performed. Also in the above cases, the flow rate control valve 9 of the water short circuit 4 is not opened.

[0011]

According to the hot water supply apparatus of the present invention, the other water supply path is branched from the upstream side of the water short circuit branch point of the water entrance path. Since it was connected via a three-way switching valve in the middle of the bath drop path, low temperature water will be mixed into the circulating hot water for immediate hot water even if the bath drop operation is performed at the same time during the immediate hot water function operation. Can be reliably prevented. Therefore, it is possible to perform the bath low temperature drop operation and the bath automatic drop operation at a temperature lower than the hot water supply set temperature simultaneously with the immediate hot water discharge function operation.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment of a hot water supply device of the present invention.

FIG. 2 is a diagram illustrating switching of a three-way switching valve.

FIG. 3 is a diagram showing a configuration of a conventional hot water supply device of this type.

[Explanation of symbols]

 1 Inlet channel 2 Heat exchanger 3 Outlet channel 4 Short-circuit channel 4a Branch point 4b Connection point 5 Bath drop channel 6 Hot water return channel for immediate hot water 7 Circulation pump for immediate hot water 17 Another water supply channel 18 Three-way switching valve

Claims (1)

[Claims] 1. A basic hot water supply path that guides water from a water inlet to a heat exchanger to heat it and discharges it to a hot water outlet, branching from the middle of the water inlet and connecting it to the middle of the hot water outlet. A water short-circuit path, a bath drop-in path branching from a downstream side of the water short-circuit path connection point of the hot water discharge path, and a water short-circuit of the water entrance path branching from a downstream side of the water short circuit path connection point of the hot water discharge path. In a hot water supply apparatus having a hot water return path for immediate hot water discharge with a pump, which is connected to a downstream side of a path branch point, another water supply path is branched from an upstream side of a water short circuit path branch point of the water inlet path and the bath is dropped. A hot water supply device characterized by being connected in the middle of a path via a three-way switching valve.