JPH10185305A - One boiler two water passage type combustion device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate the wasteful driving of a circulation pump under a condition that water is not circulated through a circulation pipeline and improve safety as well as reliability by a method wherein the thermal efficiency of a boiler body unit of hot-water supplying side is measured upon employing hot-water supplying independently to judge the existence of water in a bath boiler unit, in a one boiler two water passage type combustion device. SOLUTION: When reheating operation and automatic operation are commanded by a remote controller 21 or the like, data from a hot-water supplying side discharging hot-water temperature sensor 8, a hot-water supplying side inlet water temperature sensor 11, a hot-water supplying side water amount sensor 9 and a proportional valve 25 are inputted at first in a microcomputer to operate a thermal efficiency. When the thermal efficiency is higher than a threshold value, the inside of a bath side boiler body 1b is judged that it is air, however, when the thermal efficiency is lower than the threshold value, it is decided that the inside of the boiler body 1b is water. When it is decided that the inside of the boiler body 1b is water, a circulation pump 15 is driven to circulate hot-water in a bathtub 14 through an additional heating circulation pipeline 13. On the other hand, the gas solenoid valve 24 and the gas proportional valve 25 of the gas supplying passage 4 are opened to heat the circulating hot-water by a burner 3 and effect reheating of the hot-water in the bathtub 14.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a single-can, two-channel combustion apparatus in which a hot water supply path and a hot water supply path pass through a single heat exchanger.

[0002]

2. Description of the Related Art Conventionally, in a so-called one-can-two-channel combustion device, when hot water is supplied, that is, when a burner burns and water flows into a hot water supply can body, a reheating command for a bath is given. Is discharged, the circulation pump is driven to flow water into the bath-side can body portion, thereby starting bath reheating. In addition, when a stop command for reheating is issued while both hot water supply and bath reheating are being performed, the circulation pump is stopped, and the flow of water to the bath side can body is stopped. Is stopped.

[0003]

At this time, in the case where the reheating command or the so-called automatic operation command as described above is issued, if there is no water in the bathtub (bath), the bathtub and the bath-side can body are connected. Even if the circulation pump arranged in the circulation pipe is driven, water does not flow into the bath-side can body. As described above, when the flow of the water in the circulation pipeline is not detected by the driving of the circulation pump, conventionally, the driving of the circulation pump is stopped, and the hot water is poured into the bathtub. Then, after the pouring, the circulation pump is driven again, hot water is supplied to the bath-side can body through the circulation pipe, and reheating is performed to the set temperature. That is, when a reheating command is issued,
The circulation pump was driven, and at that time, the presence or absence of water in the bathtub was detected based on whether or not water flows in the circulation pipeline.

As described above, conventionally, it was not possible to detect the presence or absence of water in the bathtub without driving the circulating pump. Is a useless operation, and it is not preferable that such useless operation is performed.

Accordingly, an object of the present invention is to detect the presence or absence of water in a bathtub in advance without driving the circulation pump, and to omit a wasteful operation of driving the circulation pump when there is no water in the circulation pipeline. It is to provide a combustion device that can do.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to provide a can-canister having a can body comprising a hot-water supply-side can body for supplying hot water and a bath-side can body for reheating a bath. In the water channel type combustion device, when the hot water supply is used alone, the combustion efficiency is measured by measuring the thermal efficiency of the hot water supply side can body portion to determine the presence or absence of water in the bath can body portion. Is done.

At this time, for example, when the thermal efficiency of the hot water supply can body is equal to or higher than a predetermined value, it is determined that there is no water in the bath side can body, and the thermal efficiency of the hot water supply can body is lower than the predetermined value. When it is smaller, it is determined that there is water in the bath-side can body.

The predetermined value of the thermal efficiency of the hot water supply side can body is a thermal efficiency when almost all of the heat generated by combustion of the combustion device is given to the hot water supply side can body, or a value slightly smaller than that. Is preferred.

Further, a temperature detecting means for detecting a temperature in the bath-side can body is provided, and as the temperature detected by the temperature detecting means increases, the hot-water-supply can body when the hot water is used alone is used. It is preferable that the time from the start of hot water supply to measure the thermal efficiency of the hot water becomes earlier.

When a reheating command or an automatic operation command is issued, for example, when it is determined that there is water in the bath can, a circulating pump for supplying water to the bath can is provided. When it is determined that there is no water in the bath-side can body portion, the circulation pump is driven after pouring into the bath.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. However, the technical scope of the present invention is not limited to this embodiment.

FIG. 1 is a schematic configuration diagram of a one-can two-channel combustion apparatus according to an embodiment of the present invention. In FIG.
The can 1 includes a hot water supply can 1a and a bath can 1b, and shares a fin 2. The can 1 is heated by the burner 3, and fuel gas is supplied to the burner 3 from the gas supply passage 4. The gas supply passage 4 is provided with a gas solenoid valve 24 for opening and closing the gas supply passage 4 and a gas proportional valve 25 for adjusting the gas supply amount. Burner 2
Igniter electrode 5 for igniting burner 2
And a frame rod electrode 6 for detecting a flame.

A water supply pipe 7 serving as a water supply passage for supplying water to the hot water supply can 1a is connected to the inlet side of the hot water supply can 1a. This water supply pipe 7 has a water supply side water temperature sensor 8 for detecting the temperature of water supplied to the hot water supply can 1a.
And a hot water supply side water amount sensor 9 for detecting the flow rate of water supplied to the hot water supply can 1a. A hot water supply pipe 10 from which hot water heated by the hot water supply can 1a is discharged is connected to an outlet side of the hot water supply can 1a, and is led to a desired place such as a kitchen. The hot water supply pipe 10 has a hot water supply side hot water temperature sensor 1 for detecting the temperature of hot water discharged from the hot water supply can 1a.
1 is provided.

A pouring pipe 26 branches off from the hot water supply pipe 10, and the pouring pipe 26 is provided with a pouring valve 27. For example, when an automatic operation command for pouring hot water at a set temperature to the set water level is issued to the bathtub 14, the bathtub 1
When there is no water in 4, pouring valve 27 is opened, and hot water heated by hot water supply side can 1 a is poured into bathtub 14 via pouring pipe 26.

On the other hand, the bath side can body 1b is connected at its inlet side and outlet side with an inlet side reheating circuit 13a and an outlet side reheating circuit 13b, respectively. The pipes 13a, 13b are connected to a bathtub 14. In addition, the inlet side reheating circuit 13a
A circulation pump 15 is provided.
By the operation, the water in the bathtub 14 is also sent to the bath-side can 1b. Further, a bath-side water temperature sensor 16 and a bath-side water amount sensor 17 are mounted downstream of the circulation pump 15.

A control device 20 is provided in the one-can, two-channel combustion device, and a remote control 21 is mounted on the control device 20. In accordance with an instruction from the remote controller 21 or the like, the control device 20 performs hot water supply and reheating combustion control. For example, when the hot water tap 28 is opened in a kitchen or the like, water flows through the water supply pipe 7 and the hot water supply-side water amount sensor 9 detects the flow. When the control device 20 receives the incoming water detection signal from the hot water supply side water amount sensor 9, the gas supply passage 4
The gas solenoid valve 24 and the gas proportional valve 25 are opened. Then, the igniter electrode 5 is discharged and ignited. After the flame is detected by the flame rod electrode 6, the gas proportional valve is set so that the hot water temperature detected by the hot water temperature sensor 11 becomes the set temperature set by the remote controller 21. 25 are controlled. Then, by such control, the remote controller 2 is
Hot water at the set temperature set in 1 is supplied to a desired place such as a kitchen.

When the reheating operation and the automatic operation are commanded by the remote controller 21 or the like, first, as described later, it is determined whether or not water exists in the reheating circulation line 13. When it is determined that there is water, the control device 20 drives the circulation pump 15 of the reheating circuit 13 to circulate the water (hot water) in the bathtub 14 through the reheating circuit 13. . Further, the control device 20 opens the gas solenoid valve 24 and the gas proportional valve 25 of the gas supply passage 4, burns the burner 2 by ignition, heats the circulating hot and cold water passing through the bath can 1b, and heats the water ( Reheat the hot water). And
When the bath temperature detected by the bath-side hot water temperature sensor 22 reaches the bath set temperature set by the remote controller 21, the reheating operation is stopped.

On the other hand, when it is determined that there is no water in the reheating circuit 13, the water is poured into the bath, and after the water flows into the reheating circuit 13, the circulation pump is driven. Then, the same reheating as described above is performed.

In the embodiment of the present invention, the above-mentioned determination of the presence or absence of water in the additional heating circulation line 13 is made by measuring the thermal efficiency of the hot-water supply can 1a when the hot-water supply is used alone. This will be described in detail below.

As described above, for example, when a hot water supply command is issued by opening the hot water tap 28 in a kitchen or the like, the heating of the can 1 by the combustion of the burner 3 is started. At this time, the thermal efficiency of the can 1 according to the given amount of heat is generally expressed by the following equation. Thermal efficiency η = specific heat × (water supply temperature−water input temperature) × water amount / heat amount (unit omitted) When calculating the thermal efficiency η of the water supply can 1a, the water supply temperature is the hot water supply temperature sensor 8, and the water supply temperature is the hot water supply temperature. The sensor 11 and the water amount can be obtained by the hot water supply side water amount sensor 11 and the heat amount can be obtained by the opening degree of the proportional valve 25, respectively. The thermal efficiency η of the hot water supply can 1a obtained as described above has the following differences depending on the presence or absence of water in the bath can 1b.

In the one-can two-channel combustion device, even when the hot water supply is used alone, the bath can 1b is heated, so that the amount of heat given by the combustion of the burner 3 is limited to the hot water supply can 1
a to the bath-side can 1b. The bath-side can 1b performs heat exchange by the given amount of heat, and raises the temperature in the bath-side can 1b. At this time, the amount of heat used to heat the inside of the bath can 1b differs depending on whether the inside of the bath can 1b is air or water. That is, the specific heat of air is smaller than the specific heat of water, and the weight of air in the bath-side can 1b is much smaller than the weight of water of the same volume. The amount of heat required to raise the temperature to a predetermined temperature (for example, 80 degrees) at which the water is not performed is much smaller than the amount of heat required to raise the water to the predetermined temperature.

Therefore, while the bath can 1b is absorbing heat, the amount of heat used to heat the hot water can 1a is:
The case where the inside of the bath can 1b is water is smaller than the case where the inside of the bath can 1b is air. In other words, if the amount of heat given from the burner 3 is constant, the time required to heat the water in the bath-side can 1b to the above-mentioned predetermined temperature is increased by changing the air in the bath-side can 1b to the predetermined temperature. It takes more time than it takes to climb up.

FIG. 2 shows the temperature in the bath side can 1b in the air state or the water state (FIG. 2A) and the time of the thermal efficiency η (FIG. 2B) of the hot water supply side can 1a at that temperature. It is a schematic diagram which shows the relationship of.

In FIG. 2A, when the inside of the bath-side can 1b is air, the air has a small amount of heat and an initial temperature (for example, 20) before being heated for a very short time t1.
Degrees) to a predetermined temperature (eg, 80 degrees).
Thereafter, since heat exchange is not performed, all the heat supplied from the burner 3 is used to heat the water flowing in the hot water supply can 1a.

On the other hand, when the inside of the bath can 1b is water,
Since heating the water to the predetermined temperature requires a larger amount of heat than heating the air as described above, the time t2 until the water in the bath can 1b rises to the predetermined temperature is required. Is longer than when the inside of the bath-side can 1b is air. However, after the temperature reaches the predetermined temperature, all of the heat given from the burner 3 is used to heat the water flowing in the hot water supply can 1a, as in the case of air.

According to FIG. 2B, the bath-side can 1
The heat efficiency of the hot-water supply can 1a during the heat exchange in the b. takes time t1 or t2 depending on the amount of heat absorbed from the burner 3 of the bath-side can 1b. Reaches the thermal efficiency ηc when all of the heat from the hot water supply can 1a is supplied to the hot water supply can 1a.

As described above, depending on whether the inside of the bath can 1b is air or water, the hot water supply can 1a has a thermal efficiency ηc
Bath side can body 1
b) selecting a predetermined time t (for example, an appropriate time after the lapse of the time t1 and before the lapse of the time t2) during the heat exchange being performed, and measuring the thermal efficiency η of the hot water supply can 1a at that time. Thereby, the state in the bath-side can 1b can be known.

Specifically, the predetermined threshold value ηth of the thermal efficiency is
Assuming that the heat efficiency ηc when the amount of heat from the burner 3 is entirely given to the hot water supply can 1a or a value slightly smaller than that, the heat efficiency η1 of the hot water supply can 1a when the inside of the bath can 1b is air is The heat efficiency η2 of the hot water supply can 1a when it is larger than ηth and the inside of the bath can 1b is water is smaller than ηth. Therefore, by comparing the measured thermal efficiency η with the predetermined threshold ηth, it is possible to determine whether the inside of the bath can 1b is in an air state or whether water is present.

The predetermined time t is equal to the thermal efficiency η1 ≧ η
The time at which th and η2 <ηth are obtained in advance by experiments or the like. If the threshold ηth is equal to ηc, the time t is a time between the times t1 and t2.

The times t1 and t2 are values that change depending on the temperature of the bath-side can 1b at the start of hot water supply. For example, FIG. 3 shows the temperature in the bath-side can 1b in the air state or the water state when the temperature in the bath-side can 1b is already relatively high (for example, 60 degrees) at the start of hot water supply. It is a schematic diagram which shows the relationship between (FIG. 3 (a)) and the time of the thermal efficiency η (FIG. 3 (b)) of the hot water supply can 1a at that temperature. In such a case,
The temperature in the bath-side can 1b is earlier in both the air state and the water state than in the case of FIG.
Or at time t2) (see FIG. 3 (a)), whereby the thermal efficiency η of the hot water supply can 1a also reaches the thermal efficiency ηc at a relatively early time (t1 or t2, respectively) (FIG. 3 (b) )reference).

At this time, as shown in FIG.
At time t1 (t1 (20) in FIG. 3) in the case of
When the thermal efficiency η of the hot water supply can 1a is measured, the bath can 1
Since the thermal efficiency η exceeds the threshold ηth regardless of whether air or water is inside b, it is impossible to determine the state inside the bath-side can 1b.

As described above, the times t1 and t2 are values dependent on the temperature in the bath-side can 1b at the start of hot water supply, and the time t at which the thermal efficiency η of the hot-water can 1a is measured is the time when the hot water is used alone. The temperature is set according to the temperature in the bath-side can 1b at the start. The temperature in the bath-side can 1b is detected by a bath-side hot water temperature sensor 22.

FIG. 4 is a block diagram of a microcomputer 50 provided in the control device 20 for calculating the thermal efficiency η. Data from the hot water supply outlet temperature sensor 8, the hot water supply inlet temperature sensor 11, the hot water supply water amount sensor 9, and the proportional valve 25 are input to the CPU 52 via the interface 51. The thermal efficiency η is calculated by the equation for calculating the thermal efficiency stored in the ROM 53. The calculated thermal efficiency η is further determined by the threshold η stored in the ROM 53.
compared to th.

If the obtained thermal efficiency η is equal to or greater than the threshold ηth, it is determined that the inside of the bath can 1b is air. If the thermal efficiency η is smaller than the threshold ηth, the inside of the bath can 1b is It is determined to be water. Specifically, if the obtained thermal efficiency η is equal to or larger than the threshold ηth, the bathtub flag in the RAM 54 is set to 1, and if the thermal efficiency η is smaller than the threshold ηth, the flag is set to 0. Thereby, it can be determined whether the state in the bath-side can 1b is the air state or the water state.

FIG. 5 is a flowchart for executing the present invention. When a single hot water supply command is issued by opening the hot water tap 28 or the like (step S1), the hot water supply alone starts (step S2). Then, at the time t from the start of hot water supply, the thermal efficiency η of the hot water supply can 1a is measured (step S3). Further, in step S4, the measured η is compared with the predetermined threshold ηth. If the measured thermal efficiency η is equal to or larger than the threshold ηth, the bathtub flag is set to 1, and if smaller than the threshold ηth, the flag is set to 0. Thereafter, when an automatic operation or a bath reheating command is issued during or after hot water supply (step S
5) If the flag in the table is 0 in step S6, the circulation pump 15 is driven (step S6).
8) If the flag is 1, pouring into bath 14 is performed (step S7).

After pouring, the circulation pump 15 is driven (step S8), and reheating is performed to the set temperature (step S9).

FIG. 6 is a schematic diagram of a one-can, two-channel combustion apparatus having a different structure from the one-can, two-channel combustion apparatus described above. In this one-can, two-channel combustion device, the pouring pipe 26 is connected to the downstream side of the circulation pump 15 in the inlet-side reheating circulation pipe 13a. In this case, the hot water heated by the hot-water supply can 1a is poured through the pouring pipe 26, the inlet-side reheating circulation line 13a, the bath-side can 1b, and the outlet-side reheating circulation line 13b. Is performed. The embodiment of the present invention described above is also applied to the one-can two-channel combustion device.

In the above embodiment of the present invention,
More specifically, when the flag is 1 (that is, when the flag is 1)
When it is determined that the state in the bath-side can 1b is an air state), when water is injected into the bathtub 14 from a faucet 29, which is another water supply source, or when the water is poured into the bathtub 14 from the pouring pipe 26. Thereafter, when the power is turned off before the circulation pump 15 is driven, water or hot water may be present in the bathtub 14, but the bath-side can 1b may remain in an air state.

In such a case, in step S7, for example, pouring (priming) of about 10 liters is performed. Thus, when the circulation pump 15 is driven, the water in the bathtub 14 can be immediately reheated and circulated in the circulation pipeline 13. Furthermore, even if the circulation pump 15 is driven, if the bath-side water amount sensor 17 is not turned on, x liters are further poured to a position higher than the connection position of the outlet-side reheating circulation pipe 13b to the bathtub 14, The circulation pump may be driven again.

[0040]

As described above, according to the present invention,
In the one-can two-channel combustion device, when hot water is used alone, by monitoring the thermal efficiency immediately after the start of hot water supply, it is possible to detect the presence or absence of water in the reheating recirculation pipeline. Therefore, it is not necessary to determine the presence or absence of water in the bath can by driving the circulating pump when an automatic operation or a reheating command is issued immediately or immediately after using the hot water supply alone. Thus, useless driving of the circulation pump can be omitted, and control of the combustion device can be made more efficient.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a one-can two-channel combustion device according to an embodiment of the present invention.

FIG. 2 shows the relationship between the temperature in the bath can 1b in the air state or the water state (FIG. 2 (a)) and the time of the thermal efficiency η (FIG. 2 (b)) of the hot water supply can 1a at that temperature. FIG.

FIG. 3 is a diagram when FIG. 2 shows that the temperature inside the bath-side can body 1b is higher than that in FIG. 2 at the start of hot water supply.

FIG. 4 is a block diagram of a microcomputer 50 provided in the control device 20.

FIG. 5 is a flowchart for executing the present invention.

FIG. 6 is a schematic configuration diagram of a one-can two-channel combustion device having another configuration according to the embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Can 1a Hot-water supply can 1b Bath-side can 13 Reheating circulation line 13a Inlet reheating circulation line 13b Outlet reheating circulation line 15 Circulation pump 17 Bath-side water quantity sensor 20 Control device 22 Bath-side hot water Temperature sensor 25 Gas proportional valve

Claims (5)

[Claims] Claims: 1. A one-can two-channel combustion device having a can body comprising a hot-water supply side can body for supplying hot water and a bath-side can body for performing reheating of a bath; A combustion apparatus, wherein the presence or absence of water in the bath can is determined by measuring the thermal efficiency of the hot water supply can. 2. The method according to claim 1, wherein when the thermal efficiency of the hot-water supply can body is equal to or more than a predetermined value, it is determined that there is no water in the bath-side can body, and the thermal efficiency of the hot-water supply can body is reduced to a predetermined value. The combustion device is characterized in that when it is smaller than the value, it is determined that there is water in the bath-side can body. 3. The predetermined value of the thermal efficiency of the hot water supply side can body portion according to claim 2, wherein the thermal efficiency when substantially all of the heat generated by the combustion of the combustion device is given to the hot water supply side can body portion or less. A combustion device characterized by a small value. 4. The bath according to claim 1, further comprising a temperature detecting means for detecting a temperature in the bath-side can body, wherein the temperature detected by the temperature detecting means increases when the hot water supply is used alone. Wherein the time from the start of hot water supply for measuring the thermal efficiency of the hot water supply side can body becomes earlier. 5. The bath-side can body according to claim 1, wherein when a reheating command or an automatic operation command is issued, it is determined that the bath-side can body has water. A combustion device, wherein a circulation pump to be supplied is driven, and when it is determined that there is no water in the bath-side can body part, the circulation pump is driven after pouring into the bath.