JPS5824755A - Hot water supplier - Google Patents

Abstract

PURPOSE:To eliminate the possiblity of overflowing by a method wherein a water flow controlling valve and a controller for controlling a heat quantity controlling means ae provided. CONSTITUTION:A sensor 14 for hot water supply temperature and as well as the controlling valve 12 for hot water supply flow rate are provided at the outlet side of a heat exchanger 11 and at the same time the heat quantity controlling means 13 for controlling the flow rate of an energy source Ei to supply to a heat source 10. Furthermore, the hot water supplier 1 is so constituted that the signal from the sensor 14 and the signal from a setter 16 setting the ON-OFF of hot water supply, hot water supply temperature and hot water supply flow rat are inputted to the controller 15 in order to control the valve 12 and the means 13. Because the valve 12 turns off when the integrated heat quantity equivalently obtained by integrating the flow of the energy source Ei is attained to the total heat quantity to supply, which is calculated from the hot water supply temperature of the sensor 14, set hot water supply temperature and set hot water supply flow rate, the overflowing can be automatically eliminated without the supervision of user.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a water heater, which is provided with a water flow control valve that controls the amount of hot water supplied, and a heat amount control means that controls the amount of heat generated. By providing a controller, it is possible to supply hot water as desired by the user.

As this type of water heater, there is one shown in FIG. 4, for example. In the figure, 4 is the water heater, and the burner 4o is the heat source.
, a heat exchanger 41 that exchanges heat between the combustion heat in the burner 40 and the water supplied as WI to supply hot water as WO;
A proportional valve 42 that controls the amount of gas Gi supplied to the burner in order to control the amount of combustion in the burner 40, a hot water temperature sensor 43, a temperature setting means 44 that sets the hot water temperature, a hot water temperature sensor 43, and a temperature setting means 44. The controller 45 receives the signal and outputs a signal for controlling the valve opening of the proportional valve 42 so that the set temperature TR set by the temperature setting means 44 and the hot water supply temperature Two become equal. In addition to these, although not shown, there is a igniter.

It also includes an ignition state detector, flow switch, etc.

When supplying hot water to the bathtub 3 with such a water heater 4,
When the user sets the hot water temperature using the temperature setting means 44 and opens the faucet 6, the flow switch (not shown) is turned on, the igniter (not shown) is activated, and the burner 4o starts operating. Hot water supply starts 3.

be done. Since the controller 46 controls the proportional valve 42 so that the set temperature TR and the hot water temperature are equal, hot water can be supplied at a substantially constant temperature. If the specified amount of hot water is supplied to Bath Let's 3,
When the user closes the faucet 6, the flow switch turns off and combustion stops.

In such a water heater, the user must first monitor the hot water supply status and judge whether or not the amount of hot water desired by the user has been supplied during the bathing step 3. If this is not done, overflow may occur. This can lead to loss of energy (gas) and water. Second, there is the following problem. The amount Q of heat exchanged in the heat exchanger 41 is
The maximum value Qtma□ determined by the maximum combustion amount and efficiency of the burner 4° and the heat exchange efficiency cannot be exceeded. For example, if a user requests a very large amount of instantaneous hot water supply and a high temperature, the instantaneous amount of hot water supply is provided by the degree of opening of the faucet, so the hot water temperature will inevitably drop. As a result, hot water at a temperature lower than that desired by the user is accumulated in the bathtub 3.

-1 As a solution to the first problem, for example, there is a water flow control valve that has a structure in which a water flow control valve 6 is opened and the valve is closed when the integrated value reaches a predetermined amount. Using this water flow control valve eliminates the risk of overflow, but does not solve the second problem. Another solution to the second problem of dripping is to limit the amount of hot water flowing out of the faucet 5 in advance so that the desired hot water temperature can be obtained no matter what the water supply temperature is. This method has the disadvantage that even if the burner 40 has sufficient capacity, the amount of hot water supplied is reduced.

The above-mentioned conventional drawbacks can be solved by the present invention.

That is, the present invention solves the first problem by setting a water flow control valve inside the water heater body and controlling the integrated value of the calorific value of the heat source. By calculating the total amount of heat required for hot water supply from the hot water temperature and the hot water temperature,
The problem can be resolved by fully closing the water flow control valve. Second
The problem is solved by automatically reducing the amount of hot water supplied using the water flow control valve and keeping the hot water temperature constant if a capacity higher than the amount of heat Qt max is required. .

This will be explained with reference to FIG. 1 is a water heater, “heat source 10
, the heat generated by the heat source 1o is exchanged with the water supplied as WI in a heat exchanger 11, and the water is supplied as hot water Wo.

1 and 2 are water flow rate control valves that control the amount of hot water supplied, and are controlled by an output electric signal from a controller 15, which will be described later. 13 is heat source 1
It is a heat amount control means for controlling the flow rate of energy source Ei (electricity, gas, oil, etc.) supplied to o, and is controlled by the controller 16.

The controller 16 receives a temperature signal from the temperature sensor 14 that detects the hot water temperature, turns on/off the hot water supply, and controls the hot water temperature.

In response to a set value signal from the setting device 16 that sets the amount of hot water supplied. A controller that controls the water flow control valve 12 and the proportional valve 13 so that the hot water supply temperature becomes equal to the set temperature, and also controls the water flow control valve 13 to be fully closed to end hot water supply when a predetermined amount of hot water has been supplied. It is.

If the current water supply temperature is "WII set hot water supply temperature is TR9 and the set hot water supply amount (integrated value) is FW, then the total amount of heat to be supplied OR is as shown in equation 1.

QR = 'W(TR-TWI) (a
For example, if the water supply temperature is 12°C2, the set hot water supply temperature is 42°C9, and the cumulative amount of hot water supply is 2002, then OR = 2 0 0 (4 2 - 2 0) =
6000 Kcaf).

Therefore, when the integrated value of the amount of heat supplied to water through the heat exchanger 11 reaches Q determined by the first equation, the water flow control valve 1
Just turn off 2. To achieve this, as is clear from Equation 1, it is necessary to measure the supply water temperature "WI" and the cumulative amount of heat Q.
It is necessary to measure Measuring force method for supply water temperature WI
Finally, by measuring the hot water source with the temperature sensor 14 immediately before the operation of the heat source 1o starts, the temperature of the water supply can be approximately measured. The measurement of the cumulative amount of heat Q is output to the amount of heat control means 13.

It can be determined isometrically by integrating the control signals.

QMA maximum heat source capacity! , if the instantaneous flow rate is fw, then
If the instantaneous maximum flow rate for R""WO is 1wmax, then 7.

When the flow rate is greater than fwmax, TR=T
Since it cannot be done as wo and Two<TR,
The instantaneous flow rate is controlled by the water flow control valve 12. By narrowing down to a8, it is possible to make "R""WO".

FIG. 2 is a schematic diagram of a gas water heater according to an embodiment of the present invention. 1 is a gas water heater, 2 is a faucet, and 3 is a bath. 1
0 is a burner as a heat amount, 11 is a heat exchanger, 12 is a water amount control valve, 13 is an electromagnetic proportional valve as a heat amount control means,
The drive current and burner combustion amount correspond to approximately 1:1. 14 is a first temperature sensor for detecting the temperature of hot water; 16 is a controller; the first temperature sensor 4. Hot water on/off switch.

Hot water temperature setting means, hot water supply, setting device for setting the amount 16° flame detector 18. Upon receiving the signal from the first and second temperature sensor 20 for detecting the temperature of the water supply, the water flow control valve 12. Solenoid proportional valve 13. Burner 10 ignition ignition 17. A signal for controlling the combustion on/off solenoid valve 19 of the burner 10 is output.

When the hot water supply on/off switch in the setting device 16 is turned on, the controller' receives this signal and first fully opens the water flow control valve 12. Next, the solenoid valve 19 is opened, the proportional valve 13 is set to the ignition combustion amount, and the igniter 17 is turned on. burner 10
When ignited, this is detected by the flame detector 18, the controller 15 turns off the igniter 17, and the proportional valve 13 is set to the hot water temperature Two detected by the first temperature sensor and the hot water temperature setting means of the setting device 16. Control is performed so that the set temperature TR is equal to the set temperature TR. From this point on, the controller 16 starts integrating the output of the proportional valve 13, and also calculates the feed water temperature detected by the second temperature sensor, the set temperature TR, and the setting device 16.
The cumulative hot water supply amount OR set by the hot water supply amount setting means is calculated using the formula 1, and a comparison is started between OR and the amount Q obtained by converting the cumulative output amount of the proportional valve 13 into heat amount. If “R>TWO”
If this state continues for more than a predetermined time, the controller 16 throttles the water flow control valve 12 and reduces the instantaneous flow rate fw until it becomes "R""WO. After the start of hot water supply, the cumulative hot water supply amount OR and the converted product are determined by the solenoid valve. 19 is turned off to stop the burner 1o, and then the water flow control valve 12 is completely closed to end hot water supply.

Furthermore, if the hot water supply on/off switch of the setting device 16 is turned off before QR and Q become equal, hot water supply is similarly terminated.

In this example, a second temperature sensor 2° is provided to detect the temperature of the water supply, but as shown in FIG. Since the temperature sensor 14 detects the water supply temperature "WI," this may be used as the water supply temperature for subsequent control.

This is because the daily variation in the water supply temperature is extremely small and can be ignored, and can be considered constant. Further, as the water flow control valve 12 that can be used in this example, a valve using a motor or a heater bimetal for its driving part can be used. Further, although the water flow control valve 12 is provided on the outlet side of the heat exchanger 11, it is obvious that it may be provided on the inlet side of the heat exchanger 11. Furthermore, the setting device 16 is connected to the water heater 1.
However, this is installed as a remote control near the faucet 2, and the setting device 16 and controller 16 as one remote control are connected via a suitable transmission path (electric wire, space using light, sound, or radio waves, optical fiber). etc.), a configuration equivalent to that shown in FIG. 2 can be obtained.

According to this example, just by operating the setting device 16, the user can automatically obtain the desired integrated amount of hot water at the desired temperature, which is extremely convenient and solves the first and second problems of the conventional method. This means that you can get a water heater.

Next, a detailed explanation will be given with reference to a block diagram of one embodiment of the controller 15 shown in FIG. 15A is a circuit that receives a signal from the flame detector 18 and processes the signal for input to a microcomputer 15F, which will be described later. For example, when the flame detector 18 is a thermocouple, it is an A/D converter. 15B, 16C
are the first and second thermistors 2 as the first and second temperature sensors;
0.21 signal is digitized and output to the microcomputer 15F. This is a third A/D converter.

15D and 15E are a variable resistor 16B as a hot water supply temperature setting means of the setting device 16, and a variable resistor 1 as a hot water supply amount setting means.
The receiver converts the 6C signal into a digital quantity and outputs it to the microcomputer 1sF. This is the sth A/D converter. In addition to the above inputs for the microconbeater 1sF, there is also a hot water supply on/off switch 16 provided on the setting device 16.
A + There is a signal from the selection switch 16D for setting the hot water supply amount as an integrated amount or as an instantaneous amount. The microcombeater 16F receives these signals, performs necessary data processing according to a pre-stored program, and operates the solenoid valve 192, igniter 17. Proportional valve 13. Water flow control valve 1
2, and apply the result to coil 1 of solenoid valve 19.
9C drive circuit 16G1 igniter 17 ignition transformer 16
H2 proportional valve coil 13C2 drive circuit 16I, water flow control valve drive motor 12M drive circuit 161. At the same time, a combustion on/off indicator lamp 16E provided on the setting device 16,
Hot water supply end alarm buzzer 16F is also microcomputer 1s
Controlled by F.

The processing contents of the microcomputer 15F include ignition sequence control of the burner 10, hot water supply temperature control, hot water supply amount control, etc., and the detailed contents thereof have already been described. In addition, the selection switch 16D is provided because when the hot water is used for drinking hot water, for example, in Java, etc., it is necessary to control the instantaneous amount of hot water instead of the cumulative amount of hot water. If the selection switch 16D is set to the instantaneous quantity side, the microcomputer 15Fii
The set value of the variable resistor 16C for setting the amount of hot water is interpreted as the instantaneous amount of hot water, the amount of throttling of the water amount control valve 12 is determined, and the result is output. In this case, if the set hot water supply amount exceeds the capacity of burner 1o, the user is notified by some means such as outputting an alarm, and the set temperature TR
-! The amount of hot water supplied is automatically reduced and controlled so that it becomes “R” and “WO”.

In this example, variable resistors 1e'jr and 1ec are used as the hot water supply temperature setting means and the hot water supply amount setting means.
It may be a switch that does not require.

As detailed above, Mizumoto and Akira's water heaters are equipped with a water flow control valve inside the water heater, and the heat flow control means and the water flow control valve are connected to each other.
The controller 15 performs control according to the state of the water heater detected by a hot water temperature sensor, etc., and set values such as hot water temperature and hot water amount that are operated and set by the user, so that hot water at the temperature desired by the user is provided. It has an extremely excellent effect of being able to supply the desired amount.

[Brief explanation of the drawing]

Fig. 1 is a schematic configuration diagram of a water heater according to an embodiment of the present invention;
3 is a block diagram of a controller of the present invention, and FIG. 4 is a schematic diagram of a conventional water heater. 1o... Heat source, 11... Heat exchanger, 1
2...Water flow control valve, 13...Calorific value control means, 14...Temperature sensor, 16...
...Setting device, 16...Controller.

Claims (1)

[Claims] a heat source, a heat exchanger that converts water into hot water using the heat generated by the heat source, a water flow control valve that controls the amount of hot water supplied using an electrical signal, and a heat amount control means that controls the amount of heat generated by the heat source using an electrical signal. and a temperature sensor that detects the hot water temperature,
- a setting device having at least setting means for setting hot water supply on/off, hot water temperature, and hot water supply amount and transmitting a set value signal set by the setting means to the controller; and the temperature sensor and the setting device. A water heater comprising: a controller that outputs an electrical signal to the water flow control valve and heat flow control means in response to a signal from the water heater.