JPS58219352A - Heating control device of hot-water supply apparatus - Google Patents

Abstract

PURPOSE:To maintain continuously the maximum heating quantity and contrive the obtaining of hot-water temperature same as the designated temperature of the apparatus by a method wherein the hot-water quantity is controlled, and prevented the hot-water temperature from lowering of temperature caused by the exceeding of water flow over than the heating performance of a heating device. CONSTITUTION:A flow controller 1 having a driving device 21 is interconnected with a heat exchanger 14, a heating controller 25 is provided for a heating device 26 of the heat exchanger 14, the heating quantity of said heating device 26 is detected by a heating quantity detector 25a. A supplying hot-water temperature detector 23 is provided, also a hot-water supply controller 27 is composed of a heating control part 29 controlling the controller 25, a supplying hot-water temperature setting part 28 and a hot- water control part 30. That is, the hot- water supply control is performed by controlling of a driving device 21 according to the signals from said setting part 28 and said detector 23, or the signal from the detector 25a. When the supplying hot-water temperature is lower than the setting temperature to the designated amount of temperature, the water quantity of the controller 30 is decreased, when the heating quantity of the heating device 26 is smaller than the maximum heating quantity to the designated quantity of heating, the water quantity of the controller 30 is increased.

Description

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

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. . It is already known that in order to solve this problem, the amount of water can be maximized before heating, and after a certain period of heating, if the input to the heater is at its maximum and the tap water temperature is lower than the set temperature, the amount of water can be reduced. However, if the water volume is reduced too much, the maximum combustion volume cannot be secured, and in order to prevent the water volume from being over-restricted, hot water must be supplied from the maximum water volume and the water volume must be gradually reduced, making it difficult to stabilize the water volume. The disadvantage was that it took a long time.

Page 3 The present invention eliminates this drawback, and by controlling the water supply, it prevents water from flowing beyond the heating capacity of the heating device and causing the water temperature to drop, thereby always ensuring the maximum heating amount. The purpose is to obtain the same water temperature as the setting.

To achieve this objective, the present invention detects the outlet temperature of the heat exchanger heated by the heating device with a temperature detector, calculates the reliability of the outlet temperature setting unit and the outlet temperature confidence in the heating control unit,
In addition to controlling the heating controller, when the hot water outlet temperature is lower than the set temperature by a predetermined amount, the drive device is controlled to reduce the water fi- of the water flow controller to increase the hot water outlet temperature, thereby reducing the heating amount of the waste heating device. If the amount of heating is detected and is smaller than the maximum heating capacity by a predetermined amount, the drive device is controlled to increase the amount of water in the water flow controller to ensure the maximum amount of heating, and the amount of water is always controlled to the optimum amount at the maximum heating amount. The embodiment will be explained below with reference to accompanying drawings.

In FIG. 1, 1 is a water flow controller, and water enters the valve chamber 3 from the inflow path 2 and passes through the gap between the control valve 4 and the control hole 5.
It flows into the next chamber 6. 7 is a diaphragm that operates together with the control valve 4, and the other side forms a secondary chamber 8, and the secondary chamber 8 has a control spring 9 that biases the coal chamber 6 (++1J). The water flowing into the coal chamber 6 flows through the differential pressure hole 1o and the differential pressure valve 1.
1 and a differential pressure spring 12, and is supplied to the outside from 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 the coal chamber 6 and the secondary chamber 8, and a throttle 18a is provided in the second communicating passage 18 that communicates 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 gear box 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 1. By adjusting the pressure in the secondary chamber 8, the control valve 4 The amount of water can be controlled by displacing the water. 22
is 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 the gas supply path 24, the heating controller 25, and is combusted in the heating device 26, and the heating amount detector 26a detects the voltage applied to the heating controller 25. A hot water supply controller 27 controls the heating controller 25 and the drive device 21.

In the block diagram of FIG. 2, the hot water supply controller 27 is composed of a hot water outlet temperature setting section 28, a heating control section 29, a water flow control section 312, and a timer 31. There is a control 30b. 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 adjusting the calorific value of the device 26, the temperature of hot water discharged from the heat exchanger 14 is kept constant. For water flow control, signals from the outlet hot water temperature setting section 28 and the incoming water temperature detector 22 are calculated by the water flow initial control section 30a, and a drive signal is sent to the drive device 21. The capacity of the heating device 26 (including the capacity of the heat exchanger 14) is set in the water quantity initial control unit 30a, and the drive unit 6tzon 21 rotates the control valve 1Y of the water quantity controller 1, and the secondary The pressure in chamber 8 is adjusted to control the amount of water. There is another control mode for water flow control, in which the drive device 21 is driven by a water flow recontrol section 30b that calculates the signals from the hot water temperature setting section 28 and the hot water temperature detector 23 via a timer M31. Control unit 3obK (rj: heating amount detector 26a
The credit is conveyed via the timer 31.

The water amount recontrol unit 30b compares the output of the hot water temperature setting unit 28 and the output hot water temperature detector 23, and when the hot water temperature is lower than a predetermined value, drives the drive device 21 to reduce the water amount,
Based on the signal from the heating amount detector 26a, the drive device 21 is driven to increase the amount of water when the amount of heating is a predetermined amount smaller than the maximum heating amount.

Next, the operation will be explained. When the power is turned on, signals from the hot water outlet temperature setting section 28 and the incoming water temperature detector 22 are taken in, and calculations are performed in the water amount initial control section 30a. In the water quantity initial control section 30a, the heating capacity of the heating device 26 is preset to 0. For example, when a microprocessor is used for control, seven pages are programmed in advance and written in the memory element to an appropriate size. The water amount initial control unit 30a sends out a drive signal proportional to the temperature difference between the hot water outlet temperature and the inlet water temperature from a certain reference point to drive the drive device 21 I7, and the control valve 17 rotates to initialize the water amount. Let's do it. Control valve 1 of water flow controller 1
The amount of water is set by γ, and when the user starts water flow, combustion in the heating device 26 starts and after a slight delay, the temperature of the hot water rises. The deviation of the hot water temperature with respect to the hot water temperature setting is determined by the hot water temperature setting section 28 and the hot water temperature detector 23.
The respective signals are calculated by the water amount recontrol unit 30b via the timer 31. The timer 31 is used to set the length of the heating time delay between the heating device 26 and the heat exchanger 14. In the water flow recontrol unit 3ob, if the temperature difference between the hot water setting temperature and the actual hot water tap temperature exceeds a set range, the drive device 21
to reduce the water amount of the water amount controller 1.

Due to this decrease in the amount of water in the water amount controller 1, the amount of water flowing to the heat exchanger 14 decreases, and the hot water temperature rises. In this way, the amount of water is reduced until the hot water outlet temperature and the set temperature become equal, and the optimum water amount, that is, the heating device 26 is at the maximum heating amount and the hot water outlet temperature is controlled to be equal to the set temperature. On the other hand, if the water volume is reduced too much by the above-mentioned initial setting of water volume or resetting of hot water temperature detection, that is, if the water volume is controlled to be less than the heating capacity, the hot water output temperature will be adjusted to the set temperature by adjusting the capacity of the heating controller 26. is equal to However, at this time, the amount of heating is not the maximum, but a value that is somewhat reduced relative to the maximum capacity. The amount of heating can be determined based on the voltage applied to the heating controller 26. That is, when the heating amount detector 26a detects that the heating amount is reduced by a predetermined amount from the maximum heating amount, the water amount recontroller 3ob controls the driving device 2 via the timer 31.
1 is driven to increase the amount of water in the water amount controller 1.

As the amount of water increases, the load on the heat exchanger 14 increases and the amount of heating increases.
heating amount reaches maximum capacity. In PID control, the heating amount changes rapidly due to the differential term1, and a slight change in the heating load may reduce the maximum heating amount by 9 pages.If this sudden change may cause a malfunction, the maximum heating amount may change. Therefore, the water amount re-control unit 30b may output the water only when the heating amount has been reduced by a predetermined amount for a predetermined period of time.

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 control section 29 calculates the deviation between the respective signals of the hot water temperature setting section 28 and the hot water temperature detector 23, and the heating control section 25 adjusts the heating amount so that the hot water temperature is controlled to be equal to the set temperature. Ru.

Furthermore, if the user changes the hot water temperature setting beyond a certain limit, the water flow control is reset, and the signals from the incoming water temperature detector 22 and the hot water temperature setting section 28 are calculated by the water flow initial control section 30a, and the driving device Output to 21.

As described above, the present invention detects the outlet temperature of the heat exchanger heated by the heating device with the temperature detector, calculates the signal of the outlet temperature setting section and the signal of the outlet temperature in the heating control section, and heats In addition to controlling the controller, when the outlet hot water temperature is lower than the set temperature by a predetermined amount, the drive device is controlled to reduce the water flow rate of the water flow controller, and the outlet temperature is increased by 20 degrees to prevent water flow exceeding the heating capacity. In addition, if the heating amount of the heating device is detected and the heating amount is smaller than the maximum heating capacity by a predetermined amount, the drive device is controlled to increase the water amount of the water flow controller to increase the heating amount. This ensures that the maximum heating amount can always be controlled to the optimum amount of water.

Furthermore, it is of high practical value since it is not necessary to start from the maximum initial water volume, and the time required for the water volume to stabilize at the optimum water volume is short.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram showing an embodiment of the present invention, and FIG. 2 is a control block diagram showing an embodiment of the present invention. 1...Water flow controller, 14...Heat exchanger, 2
1... Drive device, 22... Incoming water temperature detector, 23... Outgoing water temperature detector, 25...
・Heating controller, 25a... Heating amount detector, 26.
... Heating device, 27 ... Hot water controller, 28
... Hot water temperature setting section, 29 ... Heating control section, 30 ... Water flow control section, 30a ...
Water amount initial control section, 3ob...Water amount recontrol section, 31
...Page 11 Timing device, 32...Driving direction detection section, 33...
. . . Water volume setting section, 34 . . . Water volume control section. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
figure

Claims (3)

[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 for the heating device, a heating amount detector for detecting the heating amount of the heating device, a hot water temperature detector, a heating control section for controlling the heating controller, a hot water tap temperature setting section, and a water flow control section. The water supply controller has a hot water supply controller consisting of a hot water supply controller, and the water flow rate control is performed by controlling the drive device according to the signals from the hot water temperature setting section and the hot water temperature detector or the signal from the heating amount detector, and when the hot water temperature is lower than the set temperature. A hot water heating control device that reduces the amount of water in the water amount controller when the amount of heat is lower than the maximum heating amount by a predetermined amount, and increases the amount of water in the water amount controller when the heating amount of the heating device is smaller than the maximum heating amount by a predetermined amount. (2) A water flow controller is controlled before heating the heating device by signals from an inlet water temperature detector and an outlet temperature setter provided on the inlet side of the heat exchanger.Claim 2, page 2, paragraph 1 The hot water heating control device described. (3) The heating amount of the heating device is less than the maximum heating amount by a predetermined amount.