JPS58198640A - Control device for supplying and heating hot-water - Google Patents

Abstract

PURPOSE:To shorten a time required for stabilizing hot-water temperature by a method wherein amount of water is preset so as to be substantially equal to a logical amount of water when a preset outlet hot-water temperature is a low temperature while the amount of water is preset so as to be larger than the logical amount of water when the preset outlet water temperature is a high temperature. CONSTITUTION:The control device for supplying and heating water is provided with a water amount controller 1 having a driving device 21, a heating controller 25 for the heating device 26 of a heat exchanger 14, temperature detectors 22, 23 for inlet water and outlet hot-water, and a hot-water supply controller 27 having an outlet hot-water temperature setting unit 28 and an initial setting and controlling unit 30 for the amount of water. The logical amount of water = (the heating capacity of the heating device 26) / (a temperature difference between the preset temperature and the inlet water temperature) is operated by the initial setting and controlling unit 30 for the amount of water to control the driving device 21. The amount of water is preset so as to be equal substantially to the logical amount of water when the outlet hot-water presetting temperature is a low temperature while it is preset so as to be larger than the logical amount of water when the outlet hot-water presetting temperature is a high temperature. According to this method, the amount of water may be preset without waiting for a temperature rise effected by the heating device 26, therefore, the time required to stabilize the hot-water temperature may be shortened.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to hot water temperature control in an instantaneous water heater, and automatically controls the heating input and the amount of hot water supplied.

A hot water temperature control device that adjusts the heating input and controls the hot water temperature in an instant hot water heater is a well-known technology, but there is a problem that the hot water temperature will drop if an excessive amount of water is supplied that exceeds the heating capacity of the hot water heater. .

To solve this problem, increase the amount of water to the maximum before heating, and after a certain period of heating, if the input to the heater is at the maximum and the hot water temperature drops relative to the set temperature, it is already possible to reduce the amount of water. Although this is known, the above method has the drawback that the appropriate temperature cannot be obtained until a certain period of time has passed after heating, which is not only inconvenient for the user, but also that the heating energy during that time is wasted.

The present invention eliminates such drawbacks, and aims to eliminate the above-mentioned waiting time by setting the maximum amount of water possible before heating based on the maximum capacity of the heating device.

In order to achieve this object, the present invention detects the inlet water temperature and outlet temperature of a heat exchanger heated by a heating device using temperature detectors, and calculates a signal from a hot water outlet temperature setting section and a hot water outlet temperature signal. The heating controller is operated by the heater to control the calorific value of the heating device, and the water amount initial setting control section calculates the output water temperature setting section signal, incoming water temperature signal, and maximum heating capacity of the heating device, and the theoretical water amount - Calculate (heating capacity of the heating device) / (temperature difference between set temperature and water inlet temperature), and when the set hot water temperature is low, it is almost equal to the theoretical water volume,
The drive device of the water flow controller is controlled in advance so that the set hot water temperature is higher than the theoretical water flow when the hot water temperature is high.Then, the rise in hot water temperature caused by the heating device is detected by the hot water temperature detector, and the signal from the hot water temperature setting section is controlled. The water flow rate resetting control unit, which calculates the water flow rate and hot water temperature, drives the water flow controller drive device to finely adjust the water flow rate and stabilize the hot water temperature.
Examples thereof will be described below with reference to the accompanying drawings.

In FIG. 1, reference numeral 1 denotes a water flow controller, and 5 water enters a valve chamber 3 from an inflow path 2, passes through a gap between a control valve 4 and a control hole 6, and flows into a cutout 6. Reference numeral 7 denotes a diaphragm that operates together with the control valve 4, and the other side thereof forms a secondary chamber 8, and the secondary chamber 8 has a control spring 9 that biases it toward the one-notch 6 side. - The water flowing into the notch 6 passes through a differential pressure generating section 13 formed by a differential pressure hole 10, a differential pressure valve 11, and a differential pressure spring 12, and then passes through a heat exchanger 14. The hot water is supplied to the outside from the outlet pipe 16. -missing character 6
A control valve 17 is provided in the first communication passage 16 that communicates with the secondary chamber 8.
A throttle 18 & is provided in the second communication passage 18 that communicates the secondary chamber 8 and the differential pressure generating section 13 . The aforementioned control valve 17 is rotated by a drive device 21 consisting of a gear box 19 and a motor 2o, and its opening degree changes. The pressure in the secondary chamber 8 is determined by the partial pressure of the control valve 17 and the throttle 181L, and can be changed by rotating the control valve 17. By adjusting the pressure in the secondary chamber 8, the control valve 4 is displaced to control the water volume. can be controlled. Reference numeral 22 denotes an inlet water temperature detector whose position is not particularly limited as long as it can detect the water temperature on the inlet side of the heat exchanger 14.

Water that has passed through the water flow rate controller 1 having the above configuration is heated by the heat exchanger 14, and the hot water temperature is detected by the hot water temperature detector 23 of the hot water tap 16.

The gas passes through the heating controller 26 from the gas supply path 24 and is combusted in the heating device 26 . 27 is a hot water controller and heating controller 2
6 and the drive device 21.

In the block diagram of FIG. 2, the hot water supply controller 27 includes a hot water temperature setting section 28, a heating control section 29, and an initial setting water amount section 3o.
, a timer 31, and a water amount resetting control section 32,
To control the hot water temperature, the respective signals from the hot water temperature setting unit 28 and the hot water temperature detector 23, which are composed of variable resistors, are calculated in the heating control unit 29, and the heating controller 26 is driven by known PID control, and the heating By reducing the total calorific value of the device 26 by 1, the hot water temperature of the heat exchanger 14 is made constant. Regarding water flow control, respective signals from the outlet hot water temperature setting section 28 and the incoming water temperature detector 22 are calculated by the water flow initialization control section 3o, and a drive signal is sent to the drive device 21. In the water amount initial setting control section 30, the capacity of the heating device 26 (including the capacity of the heat exchanger) is set, and the output signal is adjusted in advance depending on the type of the drive device 21. For example, if the drive device 21 is a pulse motor, it will send out a pulse signal, if it is a synchronous motor, it will send out an AC signal, and if it is a DC motor or a DC solenoid, it will send out a DC signal. Further, the control of the drive device 21 by the water amount initial setting control section 3o is performed by the number of pulses and the energization time. The drive device 21 is the control valve 1 of the water flow controller 1
7 to adjust the pressure in the secondary chamber 8 and control the amount of water.

There is another control mode for water flow control, in which the signals from the hot water temperature setting section 28 and the hot water temperature detector 23 are sent to the timer 31.
The drive device 21 can be driven by a signal from the water amount resetting control section 32 that is calculated via the water amount resetting control section 32 .

Next, the operation will be explained. When the power is turned on, signals from the outlet water temperature setting section 28 and the incoming water temperature detector 22 are taken in, and the water amount initial setting control section 30 performs calculations. In the water amount initial setting control section 3o, the heating capacity of the heating device 26 is set in advance.

For example, when a microprocessor is used for control, it is programmed in advance and written into the memory element. If you want to use a common microprocessor for different models with different heating capacities, you can change the settings by switching. Water amount initial setting control section 3
At o, a drive signal proportional to the temperature difference between the hot water outlet temperature and the inlet water temperature is output to the drive device 21 from a certain base point.

In response to this signal, the control valve 17 is rotated via the drive device 21 to initialize and determine the amount of water. Curve M in FIG. 3a shows the water volume set value relative to the output of the drive device 21 of the present invention, and curves B and C represent the case where an error occurs in the water volume set value due to variations in the water volume controller 1.

The curve has a characteristic that matches a capacity curve determined by the heating device 26, which will be described later. Figure 3 shows the change in the water volume setting with respect to the temperature difference between the hot water outlet temperature and the inlet water temperature (hot water temperature rise value), and the curve E shows the change in the water volume setting with respect to the temperature difference between the hot water temperature setting and the water inlet temperature (hot water temperature rise value).
The characteristics of the water flow controller 1 correspond to the curve DK71 in FIG. 3a. Curve F shows the relationship between the temperature difference between the outlet hot water setting temperature and the inlet water temperature (hot water temperature increase value) and the water amount in the case of the present invention, and the curve G and curve H indicate the relationship between the water inlet temperature detector in addition to the water flow controller 1. The curve F9 curve G9 curve H corresponds to the curve M9 curve B1 curve C of FIG. 3 &, respectively. For example, if the hot water temperature rise value is relatively lower than the set hot water outlet temperature and the inlet water temperature and is at T1 in FIG. 3, the water amount is normally set to Ql. After that, when water flow is started by the user, the amount of water Q111 flows, the heating device 26 starts combustion, and the hot water temperature rise value becomes T1, which matches the setting and also matches the capacity curve y. Therefore, hot water is supplied at full capacity. When the water amount is set to Q2 due to variations, the hot water temperature increase value becomes T2. In this case, the deviation of the hot water outlet temperature with respect to the hot water outlet temperature setting is calculated by the water amount resetting control unit 32 using the respective signals of the hot water outlet temperature setting unit 28 and the outlet hot water temperature detector 22 shown in FIG. 2 via the timer 31. The timing device 31 connects the heating device 26 to the heat exchanger 1.
4. Set the length of the heating time delay. The water amount resetting control unit 32 drives the drive device 21 if the temperature difference between the set hot water tap temperature and the actual hot water tap temperature is greater than or equal to a certain set range. Therefore, since the actual hot water temperature rise value is T2 with respect to the set hot water temperature rise value T1, the drive device 21 is driven for a certain period of time or according to the temperature deviation by the signal from the water amount resetting control section 32, and the water amount is reduced to a small amount. is corrected and reset to Ql, and as a result, the hot water temperature increase value matches T1. In this case, the change in water amount is small, so the response is quick in terms of time. Furthermore, if the water flow rate is set to Q3 due to variations even though the hot water outlet temperature is set to T1, the hot water temperature increase value becomes T3. In this case, the hot water temperature setting section 28
The deviation from the signal from the hot water temperature detector 23 is determined by the heating control unit 2.
9, the heating amount is adjusted by the heating controller 26,
The hot water temperature is immediately controlled to be equal to the set temperature.

In this way, when the hot water temperature rise value is low, if the standard value of the water flow rate setting is on the capacity curve F, even if there is variation, the time until the hot water temperature reaches the set temperature is short. Next, if the hot water temperature rise value is set to a relatively high temperature and is at T4 in Figure 3, the water volume is set to Q4, Q6, and Q6, respectively, depending on the standard value or variation, and the hot water temperature rise value is T4.
It becomes 5, T6, T7. In this case, as described above, the deviation of the hot water outlet temperature with respect to the hot water outlet temperature setting is calculated by the water amount resetting control section 32 via the timer 31, and the one drive device 21 is driven to reset the water amount to Q7, thereby increasing the hot water temperature. value T4
match. Water volume setting values Q4 and Q6 including variations
・Q6 has a larger water volume than capacity curve F in all cases. Therefore, the amount of water heated by the heating device 26 is not restricted more than necessary, and hot water is supplied at full capacity.

In order to limit the amount of water by the user, it is necessary to adjust the capacity of the heating device 26 in order to control the temperature of the hot water. In this case, the heating controller 29 calculates the deviation between the signals of the hot water outlet temperature setting unit 28 and the hot water outlet temperature detector 23, and the heating amount is adjusted by the heating controller 26, so that the hot water outlet temperature is controlled to be equal to the set temperature. Ru.

If the user changes the hot water temperature setting beyond a certain limit, the water flow control is reset, and the respective signals from the incoming water temperature detector 22 and the hot water temperature setting section 28 are calculated by the water flow initialization control section 3o, and the driving device Output to 21.

As described above, the present invention calculates the theoretical water amount - (heating capacity of the heating device) / (temperature difference between the set temperature and the incoming water temperature) from the respective signals of the hot water temperature setting section and the incoming water temperature detector and the heating capacity of the heating device. ), and the water amount initial setting control section calculates
When the hot water outlet temperature setting is relatively low, the water amount is set near the theoretical water amount, and when the hot water outlet temperature setting is relatively high, the water amount is set above the theoretical water amount, so the water amount can be adjusted in advance without waiting for the hot water temperature to rise by the heating device. The time required for stabilizing the amount of water, that is, stabilizing the temperature of the water, is short. The response time is particularly short when accurate temperature control is required, such as at low temperature settings, such as in the shower. Furthermore, in high-temperature settings such as when reheating a bath, which requires hot water to be supplied at full capacity, hot water can be supplied at full capacity even if there are variations in the amount of water.

In addition, after the initial setting of the water amount, the hot water temperature and the set temperature are calculated,
Since the water amount is finely adjusted by the water amount resetting control section via the timer, highly accurate hot water temperature control is possible.

[Brief explanation of the drawing]

Fig. 1 is a configuration diagram showing an embodiment of the present invention, Fig. 2 is a control block diagram showing an embodiment of the present invention, and Figs. This is a graph showing. 1...Water flow controller, 14...Heat exchanger, 21...Drive device, 22...Water temperature detector, 23...・Hot water temperature detector, 26...
... Heating controller, 26 ... Heating device, 27
...Hot water supply controller, 28...Hot water temperature setting section, 29...Heating controller, 3o...
Water amount initial setting control unit, 31... Timing device, 32
...Water volume resetting control section. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 3
Figure, glare 1 success 1 output tJ(,!;et)- /b) Water amount (to l)-

Claims (4)

[Claims] (1) a water flow controller having a drive device, a heat exchanger connected to the water flow controller, and a heating device for the heat exchanger;
A heating controller of the heating device, an inlet water temperature detector and an outlet temperature detector provided at the inlet and outlet of the heat exchanger, an outlet temperature setting section, a heating control section of the heating controller, and a water amount initial setting. a hot water supply controller consisting of a control section, and the water amount initial setting section calculates the theoretical water amount - (heating capacity of the heating device)/(temperature difference between the set temperature and the incoming water temperature) and controls the drive device. The hot water heating control device sets the amount of water to be approximately equal to the theoretical water amount when the hot water tap temperature is low and is larger than the theoretical water amount when the hot water tap temperature is high. (2) The hot water heating control device according to claim 1, wherein the drive device is activated before the heating device is activated. (3) The hot water supply controller has a hot water supply temperature setting section and a water volume resetting control section that calculates the signal of the hot water temperature detector via a timer, and the water flow rate resetting control section controls the drive device. The hot water heating control device according to scope 1. (4) The hot water heating control device according to claim 1, wherein when the hot water temperature setting section is changed to a temperature higher than the set temperature range, the water amount initial setting control section performs calculation again to control the drive device.