JPH0440618B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an on-off combustion control type water heater with an automatic bath water supply function that can automatically supply hot water to a bathtub in addition to normal hot water supply.

<Prior Art> When hot water is tapped at a predetermined temperature using a burner having a constant hot water pouring capacity, hot water can be tapped at a predetermined temperature by controlling the on/off time of the burner. The on/off control in that case is performed based on the following equation.

Required fuel Q: Hot water output capacity Q ₀ = On time T: Total time
T ₀ In other words, for example, if the required heat amount Q is only half of the hot water output capacity Q ₀ , then the combustion on time T is the entire time.
It should be half of T ₀ . In other words, the combustion on time T and the combustion off time may be made equal in half.

In the on-off combustion control method described above,
When the required amount of heat Q becomes close to the hot water output capacity _Q0 ,
The combustion on time becomes long and the combustion off time becomes very short.

However, extreme off-off control such as this, where the combustion on time is very long (for example, several minutes) and the combustion off time is very short (for example, several seconds), poses major problems in actual use of the device, so conventional The burner was configured to cause continuous combustion when the required amount of heat Q was close to the hot water output capacity _Q0 of the burner.

<Problems to be Solved by the Invention> When the required amount of heat Q approaches the hot water output capacity _Q0 of the burner by more than a certain level, the burner is continuously combusted, so the amount of heat greater than the required amount of heat Q is actually provided by the burner. As a result, the hot water temperature becomes higher by that amount. However, such a temperature difference does not pose much of a problem in normal hot water supply to a kitchen or the like.

However, when automatically supplying hot water to a bathtub, the influence of the temperature difference is large. This is because, for humans, a one to several degree difference in bathtub temperature is an obvious difference in heat. That is, when hot water is supplied to a bath using conventional hot water supply means, there is a drawback that the hot water may be extremely hot (to the human senses) for the bather.

Therefore, the present invention solves the drawbacks of the above-mentioned prior art,
To provide a water heater with an automatic bath water supply function, which prevents hot water higher than a set temperature from being supplied by continuous combustion during automatic bath water supply and can supply bath water at an accurate temperature.

<Means for Solving the Problems> The bath water heater with automatic hot water supply function of the present invention uses a burner with a constant hot water output capacity and controls the on/off combustion of the burner to adjust the hot water supply to a set desired temperature. A water heater with an automatic hot water supply function for a bath, which is based on the above principle, and is configured to continuously burn the burner to discharge hot water when the required amount of heat approaches the hot water supply capacity of the burner by a certain amount,
The first feature is that during automatic hot water supply for the bath, the flow rate of hot water is adjusted so that the required amount of heat is less than the above-mentioned fixed amount than the hot water output capacity of the burner.

Further, in the first feature, the second feature is that during automatic bath water supply, the flow rate of hot water is adjusted so that the required amount of heat becomes the maximum amount of heat that can be turned on and off by the burner.

In addition to the first and second features above, when hot water is poured into the bathtub as replenishment, the third feature is that it should be done under normal hot water supply conditions even if the bath is automatic hot water supply.
It is a feature of

Further, in the first feature, a fourth feature is that during automatic bath hot water supply, instead of adjusting the flow rate of hot water, the area where the burner continuously burns is configured to be narrow.

<Function> According to the first feature of the present invention, during automatic hot water supply for a bath, the flow rate of hot water is adjusted so that the required amount of heat is less than a certain value than the hot water output capacity of the burner, so that the combustion of the burner is continuous combustion. Therefore, the amount of heat equal to the required amount of heat is supplied by the burner through on-off combustion,
You can automatically supply hot water to your bath by dispensing hot water at a set temperature.

In addition, according to the second feature, the flow rate of hot water is adjusted so that the burner is burned at the maximum amount of heat that can be turned on and off, that is, the maximum amount of heat that the burner does not burn continuously. It can be used for a variety of purposes, and hot water can be drawn out at a desired temperature.

Furthermore, according to the third feature, even if the bath is automatically supplied with hot water, if the hot water is not used to fill the bathtub but is used as supplementary water after the bathtub has been filled with hot water, the system also serves to raise the temperature of the bathtub. Therefore, by allowing continuous combustion in the burner, high-temperature water can be drawn out effectively.

Furthermore, according to the fourth feature, during automatic bath hot water supply, instead of adjusting the hot water flow rate to set the burner in an on-off combustion region, the continuous combustion region is made narrower, so that substantially on-off combustion is performed. Therefore, even with this configuration, hot water can be efficiently tapped at a desired temperature.

<Embodiment> FIG. 1 is an overall configuration diagram of a bath water heater with an automatic hot water supply function showing an embodiment of the present invention, and FIG. 2 is a determination flowchart for determining a hot water supply control method in a control section.

Water supplied through the water inlet pipe 1 enters the heat exchange section 4 via the water inlet flow rate sensor 2 and the water inlet temperature sensor 3, where it is instantaneously heated by the burner 5 and is discharged into the hot water outlet pipe 6 as hot water. After passing through the flow rate regulator 7, the hot water dispensed is branched into an automatic bath water supply pipe 8 and a normal hot water supply pipe 9, and the hot water flowing to the automatic bath water supply pipe 8 is passed through a first electromagnetic on-off valve 10 and a bath water supply amount sensor 11. After that, it is introduced into the bathtub. In addition, the hot water flowing into the normal hot water supply pipe 9 passes through the check valve 12 and then passes through the check valve 12.
It is poured from 3. Further, a bypass pipe 14 is provided from the water inlet pipe 1 to the normal hot water supply pipe 9, and a second electromagnetic on-off valve 15 is provided. Note that the burner 5 is provided with an on/off fuel supply valve 16.

20 is a control unit with a built-in microcomputer, and a remote control 30
It also inputs information from the incoming water flow rate sensor 2, incoming water temperature sensor 3, bath hot water supply amount sensor 11, etc., and operates the flow rate regulator 7 and the first and second electromagnetic on-off valves 10, 15, On-off fuel supply valve 16
Output commands to etc.

To further explain the control by the control unit 20, the control unit 20 first determines whether or not the hot water supply to be performed from now on is automatic bath water supply (second
If automatic bath water supply is not used, normal hot water supply control (Flowchart) is performed. In the case of automatic hot water supply for a bath, it is further determined whether or not it is a high-temperature pouring hot water operation in automatic refilling operation (fluoro), and if it is high-temperature pouring hot water, normal hot water supply control (fluoroha) is performed. Ru. Since high-temperature hot water is supplied at a much higher temperature, such as 60℃ to 80℃, compared to the hot water supply temperature in normal automatic bath water supply, it is more efficient to use regular hot water supply control, and because it is supplementary water, it is more accurate. This is because a certain hot water temperature is not necessarily required. When hot water is automatically supplied to a bath but not at a high temperature, for example when a bathtub is automatically filled with hot water, special hot water supply control (Froni) is used.

A description will be given of normal hot water supply control performed for normal hot water supply to a place other than a bathroom such as a kitchen.

In this case, the set hot water temperature is determined from the set hot water temperature input from the remote controller 30, the inlet water temperature detected by the inlet water temperature sensor 3, and the inlet water flow rate detected by the inlet flow rate sensor 2 when the collar 13 is opened. The required amount of heat Q required for tapping the hot water is first calculated by the control unit 20. By comparing this required amount of heat Q and the hot water output capacity Q ₀ of the water heater,
The ratio of combustion on time and combustion off time during operation is calculated, and actual combustion on time and combustion off time are determined so that combustion on and off are repeated at appropriate time intervals. Based on this principle, when the required heat amount Q approaches the hot water tapping capacity _Q0 , the cycle becomes such that the combustion on time is extremely long and the combustion off time is extremely short, which poses a serious problem in actual use of the equipment. Therefore, if the required fuel Q is close to the hot water output capacity Q ₀ by a certain amount or more, the combustion off time is ignored and continuous combustion is performed. For example, if the hot water supply capacity Q ₀ is
If the required amount of heat Q exceeds 19G calories at 20G calories, it will be burned continuously. The required fuel Q to escape from continuous combustion can be set to 18.5G calories. When performing such control, continuous combustion may occur even if the required amount of heat Q is less than the hot water tapping capacity _Q0 , and the hot water tapping temperature may become higher than the set temperature.

Next, special hot water supply control will be explained. In this case, the flow rate through the heat exchange section 4 is adjusted in advance by the flow rate regulator 7 so that the required amount of heat Q does not fall into the continuous combustion region. That is, when performing special hot water supply control, first, the amount of heat that is less than a certain value than the hot water output capacity Q ₀ of the water heater, that is, the amount of heat that does not fall within the continuous combustion region, is selected in advance for calculation. This selected amount of heat is preferably slightly smaller than the continuous combustion region, for example, 18.4 G calories in the above example, in order to utilize the burner capacity sufficiently effectively.
Then, using the selected amount of heat as the required amount of heat, the hot water flow rate (inflow flow rate) necessary for the hot water temperature to reach the bath hot water temperature setting based on the bath water supply setting temperature and the incoming water temperature.
is calculated, and the flow rate regulator 7 is adjusted to achieve the calculated hot water flow rate. If the flow rate of hot water tapped is adjusted in advance using the flow rate regulator 7 in this way, the required amount of heat Q will not fall into the continuous combustion range, and hot water will be tapped at an accurate set temperature through on-off combustion.

When automatic bath water supply and normal hot water supply are performed at the same time, priority is given to special hot water supply control.

The amount of water automatically supplied to the bathtub is determined by the bath water supply amount sensor 1.
1 is detected, and when a predetermined amount of water enters the bath, automatic hot water supply for the bath is stopped. Further, the second electromagnetic on-off valve 15 is opened when high temperature hot water is poured into the bathtub, and prevents high temperature hot water supply when normal hot water supply is performed at the same time by opening the collar 13.

In the embodiment, high-temperature pouring hot water is also excluded from the special hot water supply control, but it is also possible to distinguish between the special hot water supply control and the normal hot water supply control based only on whether the bath automatic hot water supply is other than that.

In addition, in the example, the continuous hot water supply area is left as is,
In special hot water supply control, the flow rate is adjusted to prevent the required amount of heat from entering the continuous hot water supply region, but instead of adopting such a method, during special hot water supply control, the continuous hot water supply region itself is narrowed (including when it is reduced to zero). ) to ensure that hot water is dispensed at the correct temperature. The present invention includes such means within its technical scope.

<Effects> The present invention has the above configuration, and according to the configuration of claim 1, the hot water flow rate is adjusted so that the required amount of heat is less than a certain amount than the hot water output capacity of the burner during automatic hot water supply for the bath. There is no inconvenience such as the hot water temperature becoming higher than the set temperature due to entering the continuous combustion region, and automatic bath hot water supply at an accurate temperature can be ensured by on-off combustion control.

Furthermore, according to the second aspect of the present invention, when automatically supplying hot water to a bath, the flow rate of hot water is adjusted so that the required amount of heat becomes the maximum amount of heat that can be turned on and off by the burner. It can be used to the fullest, and can efficiently and automatically supply hot water to the bath at an accurate temperature.

Further, according to the third aspect of the present invention, hot water pouring is performed under normal hot water supply conditions, so hot water can be poured efficiently by continuous combustion or the like.

Furthermore, according to the configuration of claim 4, during automatic hot water supply for a bath, the range in which the burner continuously burns is narrowed, so even if the control is performed in the same way as normal hot water supply, the continuous combustion range is less likely to occur. , can automatically supply hot water to the bath at an accurate temperature.

Of course, in these cases, by providing a continuous combustion region during normal hot water supply, on-off combustion that causes an extreme imbalance between combustion on time and combustion off time is eliminated, and this improves mechanical, practical, and other aspects of operation. Less likely to cause any inconvenience.

[Brief explanation of drawings]

FIG. 1 is an overall configuration diagram of a bath water heater with an automatic hot water supply function showing an embodiment of the present invention, and FIG. 2 is a determination flowchart for determining a hot water supply control method. 1: Water inlet pipe, 2: Inlet water flow rate sensor, 3: Inlet water temperature sensor, 4: Heat exchange section, 5: Burner, 6: Hot water outlet pipe, 7: Flow rate regulator, 8: Bath automatic hot water supply pipe, 9:
Normal hot water pipe, 20: control unit, 30: remote control.

Claims (1)

[Claims] 1. The principle is to use a burner with a constant hot water output capacity and control the on/off combustion of the burner to adjust the temperature of the hot water to a set desired temperature. A water heater with an automatic bath hot water supply function configured to continuously burn a burner to discharge hot water when the hot water supply capacity approaches a certain level, and when the bath automatic hot water supply is performed, the required amount of heat exceeds the hot water supply capacity of the burner. A water heater with an automatic hot water supply function for a bath, characterized in that it is configured to adjust the flow rate of hot water so that it is less than a certain level. 2. The water heater with an automatic bath hot water supply function according to claim 1, wherein the flow rate of the hot water is adjusted so that the required amount of heat becomes the maximum amount of heat that can be turned on and off by the burner during automatic bath water supply. 3 When pouring high-temperature hot water into the bathtub as supplementary water,
3. The water heater with an automatic bath water supply function according to claim 1, wherein automatic hot water supply for a bath is performed under normal hot water supply conditions. 4. The water heater with an automatic bath hot water supply function according to claim 1, wherein during automatic hot water supply for a bath, instead of adjusting the flow rate of hot water, the area in which the burner continuously burns is configured to be narrow.