JPH07324814A - Hot-water supply apparatus - Google Patents

Abstract

PURPOSE:To provide a hot-water supply apparatus which, when a draft is sent in post-purge in a bathwater-heating body of small combustion capacity, enables freeing the hot-water supply body of unnecessary noise of a blower. CONSTITUTION:The subject relates to a two-body two-circuit type hot-water supply apparatus which is equipped with a hot-water supply body 10 having a burner 11 and a blower 12 and with a bathwater-heating body 20 having a burner 21 and a blower 22 and which has a common exhaust passageway 60 and, when combustion is produced in one body whereas there is no combustion in the other body, is designed to keep the blower operating in a manner similar to a case where the apparatus itself is operating a combustion. The apparatus is equipped with a controller 70 by which, when a draft is sent in post-purge after the combustion operation of the bathwater heating body 20 which is of small combustion capacity, the post-purge is carried out at a smaller number of revolutions than the essential post-purge of the apparatus itself in the hot-water supply body 10 having a larger combustion capacity and for a reduced period of time applicable to the post-purge in the bathwater-heating body 20.

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, and more particularly to a hot water supply apparatus having two cans and two circuits, which has a hot water supply can and a bath heating can and has a common exhaust passage.

[0002]

2. Description of the Related Art Conventionally, in a two-can two-circuit hot water supply device having a common exhaust passage, each can body has a burner and a blower fan, and each can burn independently. When the burner of either one of the cans is burned, the exhaust passage is common, so the exhaust gas generated in one of the cans may flow back to the other can through the exhaust passage, Even if either one of the burners burns, both blower fans are driven, and also in the post-purge after the combustion is stopped, both blower fans are driven similarly.

[0003]

However, in the above-described conventional hot water supply apparatus, even when only the bath heating can body having a small combustion capacity is burned, the other hot water supply can body having a large combustion capacity during post-purging. The blower fan is driven for exactly the same number of rotations and blowing time as when the burner of the hot water supply can burns.Therefore, the combustion noise during combustion does not make the rotation noise of the blower fan noise, but the bath heating can There has been a problem that during the post-purge operation of the body, the fan for the hot-water supply can body, which originally does not need to be driven, causes a large amount of noise.

In view of the above, the present invention solves the above-mentioned drawbacks of the conventional apparatus, and eliminates unnecessary noise caused by the blower fan on the side of the hot water supply can during the post-purging air blowing in the bath heating can having a small combustion capacity. The purpose is to provide a device.

[0005]

In order to achieve the above object, the hot water supply apparatus of the present invention is provided with a burner and a blower fan, and a hot water supply can body for heating incoming water from tap water into hot water and discharging hot water, and also a burner. And a bath heating can body for heating circulating water from a bath with a blower fan, and a two-can two-circuit water heater having a common exhaust passage, in which combustion operation is performed in one can body. In the case of the hot water supply device in which only the blower fan is driven in the same manner as when the self-combustion operation is performed even when the other can body is not in the combustion operation, Regarding the post-purge air flow after only the combustion operation, the post-purge air flow in the hot water supply can body with a high combustion capacity is lower than the original rotation speed of the original post-purge air flow, and the temperature of the bath is increased. It is characterized by comprising a controller for by shortening the same time as the post-purge time of the can body.

[0006]

According to the features of the present invention described above, when only the bath heating can body having a small burning capacity is burned and the combustion is completed, the post-purge air blow in the bath heating can body and the hot water supply can are thereby caused. Although the post-purging air blowing in the body is also started, the post-purging air blowing in the hot water supply can body in this case is different from the original post-purging air blowing at a lower rotation speed than the original and the bath heating can body The post-purging time of the blower fan is shortened to the same time. Therefore, in this case, noise caused by the blower fan of the hot water supply can is suppressed and the noise is reduced. The post-purge airflow after combustion is the same as before when the hot water supply canister is burned alone or when both the bath heating canister and the hot water supply canister are burned. The post-purge rotation speed and the post-purge time are used when the combustion of the can body is stopped. In the present invention, a new means different from the original post-purging air blowing is added to the method of the post-purging air blowing on the side of the hot-water supplying water heating canister when only the bath heating canister is independently burned and stopped. As a result, it was possible to suppress the generation of unnecessary noise during the post-purge period after the single combustion operation of the bath heating can having a low combustion capacity.

[0007]

EXAMPLES The present invention will be described below based on examples.
1 is an overall configuration diagram showing an embodiment of a hot water supply apparatus of the present invention, and FIG. 2 is a flow chart showing a control mechanism of a controller of the present invention.

First, in FIG. 1, 10 is a can body for hot water supply, and 20
Is a bath heating can. The hot water supply canister (10) is equipped with a burner (11) and a blower fan (12), and an instantaneous heat exchanger (13). The water that has entered the instantaneous heat exchanger 13 of the hot water supply can body 10 from the tap water through the water inlet pipe 31 is heated there, and the hot water outlet pipe 32
Is bathed in. 14 is an igniter, and 15 is a flame detector. Also
33 is a water amount sensor. Burner for the bath heating can 20
21 and a blower fan 22 are provided, and an instantaneous heat exchanger 23 is provided. Water from a bathtub (not shown) enters the instantaneous heat exchanger 23 of the bath heating can body 20 through the circulation path 40 and is heated. 24 is an igniter and 25 is a flame detector. Further, 41 is a water amount sensor, and the capacity of the hot water supply can body 10 is larger than the capacity of the bath heating can body 20 so as to have a sufficient hot water supply capacity. For the burners 11 and 21 of the respective cans 10 and 20,
After the oil fuel passes through the common oil passage 50, each branch pipe
It is supplied via 51, 52.

A common exhaust passage 60 is provided in the hot water supply can body 10 and the bath heating can body 20. Each can 10,
The exhaust gas generated in 20 is exhausted to the outside through the common exhaust passage 60. In the hot water supply device provided with the common exhaust passage 60, in order to prevent exhaust gas discharged from one can body from flowing back into the other can body during combustion operation in the one can body. It is necessary to drive the blower fan also in the other can body.

Reference numeral 70 denotes a controller, which incorporates a microcomputer, inputs information from a sensor arranged in each part of the hot water supply device, and controls the operation of each part of the device in accordance with a control program stored in advance. Both cans 10 by this controller 70,
The combustion operation operation in 20 will be described with reference to the flow of FIG. 2 particularly regarding control of the blower fan. Now, based on the information from the water amount sensors 33 and 41, when the minimum working water amount or more flows into either one of the hot water supply canister 10 and the bath heating canister 20 (S1
Yes), the controller 70 at that point starts pre-purge ventilation of the fan of the can body that has flowed more than the minimum working water amount, and blows the fan fan of the can body that does not flow more than the minimum working water amount (pre-purge ventilation) at the same time. Will start together (S
2). In this case, the blower fans 12 and 22 perform the prepurge air blowing under their own prepurge air blowing operating conditions.
Since this pre-purging air blowing must be performed in consideration of the air blowing amount at the time of ignition, it does not take place at too high a speed for both the hot water supply canister 10 and the bath heating canister 20, so the problem of noise is less Does not happen. Then, when the prepurge air blowing time has elapsed, the controller 70 ignites the burner of the can body which has detected the minimum working water amount or more, and starts the independent operation (S).
3). The presence or absence of ignition is detected by flame detectors 15 and 25. Cans that do not detect more than the minimum amount of working water do not burn and only blow air.

The controller 70 constantly monitors whether or not the hot water supply canister 10 has combusted by the input information from the flame detector 15 (S4). Then, set the hot water supply combustion flag in the microcomputer (S5),
When the post-purge air blowing of the hot water supply canister 10 is completed, the hot water supply combustion flag is turned off (S12). When the bath heating can body 20 independently starts combustion, the hot water supply combustion flag is not set. Then, when the flow rate becomes less than the minimum operating water amount during the independent combustion operation of either the hot water supply canister 10 or the bath heating canister 20 (Yes in S6), the combustion of the can body during the independent operation is stopped ( S
7), Post-purge air blow by fan (S9, S1
Move to 0).

Prior to the post-purging air blowing, the controller 70 determines whether or not the hot water supply combustion flag is set (S
8) If it is not standing (NO in S8), it is determined that the bath heating can body 20 is independently burned and the hot water supply canister 10 is not burned. Therefore, in this case, the controller 70 Is a special postpurge rotation speed N ₃ lower than the normal postpurge airflow rotation speed N ₂ for the blower fan 12 of the hot water supply can 10, and a postpurge time shorter than the normal postpurge time t _2. The post-purge air is sent at the same time as the post-purge time t ₁ of the fan 22 of the heating can body 20. Blower fan for the bath heating can body 20 side
For _No. 22, the post-purge drive is performed at the normal post-purge air blowing rotation speed N ₁ and the normal post-purge time t ₁ (S
9).

If the hot water supply combustion flag is set in step S8 (YES in S8), the single combustion operation of the hot water supply canister 10 has been performed. In this case, the controller 70 is operated.
Causes the blower fan 12 of the hot water supply can body 10 to be post-purge driven at the normal post-purge air-blowing speed N ₂ and at the normal post-purge time t ₂ . Blower fan for the bath heating can body 20 side
For _No. 22, the ordinary post-purge drive is performed at the ordinary post-purge air blowing rotation speed N ₁ and the ordinary post-purge time t ₁ . (S10).

When the post-purge air blowing operation of the hot water supply canister 10 is completed with the lapse of time (S11), the hot water supply combustion flag is lowered (S12). Of course, before the post-purge air blowing operation is completed, if the flow rate of the minimum operating water amount or more flows into the hot water supply can body 10 or the bath heating can body 20 again, the operation is performed toward the start of combustion.

In the above, the case where either one of the hot water supply canister 10 and the bath heating canister 20 is operated independently has been described. However, when both canisters are simultaneously burned, one of the canisters burns. When stopped, it goes without saying that the can body that has stopped burning performs the post-purging air blowing operation as a normal operation of the can body, and the remaining burning can body continues to burn as it is. Then, when the other can body continues to burn at the time when the post-purge air blowing operation is finished, the can body that has finished the post-purging air blowing operation starts to blow air by the air blowing fan again.

[0016]

According to the present invention, which has the above-described structure,
According to the hot water supply device described in (1), in a hot water supply device of two cans and two circuits having a hot water supply can body and a bath heating can body, and having a common exhaust passage, only the combustion operation of the bath heating can body having a small combustion capacity is performed. Regarding the post-purge air flow after being blown, the post-purge air flow in the hot water supply can body having a high combustion capacity is lower than the original rotation speed of the original post-purge air flow and the same as the post-purge time of the bath heating can body. Since it is equipped with a controller that shortens the time, in a hot water supply device that needs to drive the blowing fan of the other can at the same time when operating one can, the independent combustion operation of the small bath heating can It has become possible to suppress the generation of unnecessary noise due to the blower fan of the hot water supply can body having a large capacity in the subsequent post-purge period.

[Brief description of drawings]

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

FIG. 2 is a flowchart showing a control mechanism of the controller of the present invention.

[Explanation of symbols]

 10 Hot water supply canister 11 Burner 12 Blower fan 20 Bath heating canister 21 Burner 22 Blower fan 60 Exhaust passage 70 Controller

Claims (1)

[Claims] 1. A hot water supply can body equipped with a burner and a blower fan to heat incoming water from a tap water into hot water and discharge hot water, and a bath heating can body also equipped with a burner and a blower fan to heat circulating water from a bathtub. A two-can, two-circuit water heater having a common exhaust passage, and when one of the can bodies is burnt, the other can body is not burnt. In the hot water supply device in which only the blower fan is driven as in the case of performing the combustion operation, the post-purge airflow after only the combustion operation of the bath heating can with a small combustion capacity is performed A controller that performs post-purging air blowing in a large hot water supply can at a rotational speed lower than the original rotational speed of the original post-purging air blowing and at the same time as the post-purging time of the bath heating can. A hot water supply device comprising: