JPS6242220B2 - - Google Patents

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 in an instant hot water heater and controls the hot water temperature is a well-known technology.
There was a problem in which the temperature of the hot water would drop if an excessive amount of water was supplied that exceeded the heating capacity of the water heater. It is already known that in order to solve this problem, the amount of water is maximized before heating, and after a certain period of heating, if the input to the heater is at the maximum and the outlet temperature is lower than the set temperature, the amount of water is reduced. However, in the above method, the appropriate temperature cannot be obtained unless the user waits for a certain period of time after heating, which is not only inconvenient for the user, but also has the disadvantage 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 using 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 heating controller to control the calorific value of the heating device, and the water amount initial setting control portion calculates the output water temperature setting portion signal, the incoming water temperature signal, and the maximum heating capacity of the heating device. The driving device of the water flow rate controller is driven to control the amount of water in advance so that the amount of water (heating capacity of the heating device)/(temperature difference between the set temperature and the incoming water temperature) is satisfied. The temperature is detected by the temperature detector, and the water volume resetting control unit, which calculates the signal from the hot water output temperature setting unit and the hot water temperature, drives the drive device of the water volume controller to finely adjust the water volume and stabilize the hot water temperature. Embodiments thereof will be described below with reference to the accompanying drawings.

In FIG. 1, reference numeral 1 denotes a water flow controller, in which water enters a valve chamber 3 from an inflow path 2, passes through a gap between a control valve 4 and a control hole 5, and flows into a primary chamber 6. 7 is a diaphragm that operates together with the control valve 4, and the other side is a secondary chamber 8.
A control spring 9 is placed in the secondary chamber 8 and biased toward the primary chamber 6. The water flowing into the primary chamber 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 is supplied to the outside through a heat exchanger 14 and a hot water outlet pipe 15. A regulating valve 17 is provided in the first communicating passage 16 that communicates between the primary chamber 6 and the secondary chamber 8, and a throttle 18a is provided in the second communicating passage 18 that communicates between the secondary chamber 8 and the differential pressure generating section 13.
is provided. The aforementioned control valve 17 is rotated by a drive device 21 consisting of a gearbox 19 and a motor 20, 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 18a, and can be changed by rotating the control valve 17. By adjusting the pressure in the secondary chamber 8, the control valve 4 can be adjusted. The amount of water can be controlled by displacement. Reference numeral 22 denotes an inlet water temperature detector, and its position is not particularly limited as long as it can detect the water temperature on the inlet side of the heat exchanger 14.

The water that has passed through the water flow controller 1 having the above configuration is heated by the heat exchanger 14, and the temperature of the hot water is detected by the hot water temperature detector 23 of the hot water tap 15.

The gas passes through a heating controller 25 from a gas supply path 24 and is combusted in a heating device 26 . A hot water supply controller 27 controls the heating controller 25 and the drive device 21.

In the block diagram of Fig. 2, hot water controller 2
7 has a hot water temperature setting section 28, a heating control section 29, an initial setting water amount section 30, a timer 31, and a water amount resetting control section 32. The signals from the heating controller 28 and the hot water temperature detector 23 are calculated by the heating controller 29, and the signals from the heating controller 2 are calculated by the heating controller 29 using known PID control.
5 and adjusts the calorific value of the heating device 26 to keep the temperature of hot water discharged from the heat exchanger 14 constant. Regarding water flow control, the respective signals from the outlet hot water temperature setting section 28 and the inlet water temperature detector 22 are converted by the water flow initialization control section 30 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 30 is performed by the number of pulses and the energization time. Drive device 21
rotates the control valve 17 of the water flow controller 1 to adjust the pressure in the secondary chamber 8 and control the water flow.

There is another control mode for water flow control.
The driving device 21 can be driven by a signal from a water amount resetting control section 32 that calculates signals from the hot water temperature setting section 28 and the hot water temperature detector 23 via a timer 31.

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 30, 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 it is desired to use a common microprocessor for different models with different heating capacities, the settings can be changed by switching. The water amount initial setting control unit 30 outputs a drive signal proportional to the temperature difference between the hot water outlet temperature and the inlet water temperature to the drive device 21 from a certain reference point. In response to this signal, the control valve 17 is rotated via the drive device 21 to initialize the water amount. Third
Curve A in Figure a shows the water volume setting value relative to the output of the drive device 21, and the water volume is inversely proportional to the drive device output. Figure 3b 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 (if the hot water outlet temperature and the actual hot water outlet temperature are equal, the hot water temperature rises). Heating device 2
6 shows the capacity curve determined by the capacity of No. 6, and line C shows the temperature difference between the hot water set temperature and the incoming water temperature in the case of the present invention (in the present invention, the hot water temperature is controlled to be equal to the hot water set temperature as described later). It shows the relationship between water volume (which is equal to the hot water temperature rise value) and water volume. For example, if the hot water temperature rise value is T ₁ in FIG. 3b based on the set hot water outlet temperature and the inlet water temperature, the water amount is set to Q ₁ (point D). After that, when the water flow is started by the user, the amount of water Q ₁ flows, combustion in the heating device 26 starts, and after a slight delay, the hot water temperature rise value is T ₂ (point E in Figure 3b). )become. The deviation of the outlet hot water temperature with respect to the outlet hot water temperature setting is calculated by the water amount resetting control section 32 using the respective signals of the outlet hot water temperature setting section 27 and the outlet hot water temperature detector 23 via the timer 31. The timer 31 sets the length of the heating time delay between the heating device 26 and the heat exchanger 14. Water amount resetting control section 3
In 2, if the temperature difference between the set hot water tap temperature and the actual hot water tap temperature is greater than or equal to the set range, the drive device 2
Drive 1. Hot water temperature rise value set in Figure 3b
The actual hot water temperature rise value is _T2 with respect to _T1 , and the drive device 21 is driven for a certain period of time or according to the temperature deviation by the signal from the water volume resetting control section 32, and the water volume is increased.
Q ₂ (point E) is reset, and as a result, the hot water temperature rise value becomes equal to T ₁ (point G), and the heating device 26
It is possible to supply hot water at full capacity. When the final hot water tap temperature is obtained with respect to the hot water tap setting temperature, the capacity of the heating device 26 is fully opened, as shown in Fig. 3b.
It is necessary that the water quantity characteristic curve C has a slightly higher water quantity than the capacity curve B. If the water quantity characteristic is a characteristic in which the water quantity is less than the capacity curve B, the water quantity is restricted more than necessary, and the heating amount of the heating device 26 is restricted by the heating controller 25, which will be described later. Since temperature control is performed, hot water cannot be supplied at the maximum capacity of the heating device 26. In order to set the water amount above the capacity curve B, there is a method of sending an output signal obtained by subtracting a certain value from the output signal to the drive device 21 calculated in the water amount initial setting control section 30, or as shown in FIG. 3a. Curve H shows the flow rate characteristics with respect to the drive device output.
You can correct it in advance like this. Furthermore, in order to shorten the time required for the water amount to become stable, water amount characteristics that approximate the capacity curve B in FIG. 3b are required. In the present invention, as shown in FIG. 3a, the water amount is configured to be inversely proportional to the drive device output, and a water amount characteristic C along the capacity curve B is obtained.

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 hot water temperature setting section 28 and the hot water temperature detector 23
The heating controller 29 calculates the deviation of each signal, and the heating controller 25 adjusts the amount of heating to control the outlet temperature to be equal to the set temperature.

Additionally, if the user changes the hot water temperature setting beyond a certain limit, the water flow control will be reset.
Signals from the incoming water temperature detector 22 and the outgoing water temperature setting section 28 are calculated by the water amount initial setting control section 30 and output to the drive device 21 .

As described above, the present invention uses the water amount initial setting control section that calculates the output water temperature setting section signal, the incoming water temperature signal, and the maximum heating capacity of the heating device to control the water amount (heating capacity of the heating device)/(set temperature). By controlling the amount of water so that the temperature difference between In addition, hot water can be supplied at full capacity of the heating device, and after the water volume is initialized, the outlet temperature and the set temperature are calculated, and the water volume is finely adjusted by the water volume reset control unit via the timer. It allows for highly accurate water temperature control.

[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 invention, and Fig. 3 is a block diagram showing an embodiment of the present invention.
Figures a and b are graphs showing the characteristics of the water flow controller in the embodiment of the present invention, respectively. 1...Water flow controller, 14...Heat exchanger, 21...
... Drive device, 22 ... Inlet water temperature detector, 23 ...
Hot water temperature detector, 25... Heating controller, 26...
Heating device, 27... Hot water supply controller, 28... Hot water temperature setting section, 29... Heating control section, 30... Water amount initial setting control section, 31... Timing device, 32... Water amount resetting control section.

Claims (1)

[Scope of Claims] 1. A water flow controller having a driving device, a heat exchanger connected to the water flow controller, a heating device that heats the heat exchanger, and a heating device that adjusts the heating amount of the heating device. A hot water supply comprising a controller, an inlet water temperature detector and an outlet water temperature detector provided at the inlet and outlet of the heat exchanger, respectively, an outlet temperature setting section, a heating control section of the heating controller, and a water amount initial setting control section. a water supply heating control device, the water supply heating control device having a controller, and controlling the drive device by the water amount initial setting control section according to the relationship: water amount (heating capacity of the heating device)/(temperature difference between set temperature and incoming water temperature). 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 temperature setting section and a water amount resetting control section that calculates the signal of the hot water temperature detector via a timer, and the water amount resetting control section controls the driving device of the water amount controller. A hot water heating control device according to claim 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 calculates again and controls the drive device. 5. The hot water heating control device according to claim 1 or 3, wherein the amount of water is controlled in inverse proportion to the amount of operation of the drive device.