JPS58217145A - Control device for heating of liquid - Google Patents

Abstract

PURPOSE:To obtain hot-water with a set temperature by a method wherein a heating amount is controlled and a water feeding amount mor than the maximum heating capacity is limited automatically. CONSTITUTION:In the control unit 27 of supplying hot-water, the signals of an inflow water temperature detector 22 and an outflow hot-water temperature setting unit 28 are introduced into the initial period control unit 30a of a water volume control unit 30 upon beginning of operation and a difference between them is operated to control the control unit 1 of water volume for a heat exchanger 14 through a driving device 21 while a differential signal of the outflow hot-water temperature detector 23 and the setting unit 28 is introduced into the re-control unit 30b of the water volume through a timing device 31 to operate the time delay of heating and control the water volume being used at that time. A heating device 26 is controlled by a heating control unit 29 through a heating controller 25 in accordance with a difference between the outflow hot-water temperature and the set value thereof.

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 is maximized before heating, and after a certain period of heating, if the input to the heater is at the maximum and the tap water temperature is lower than the set temperature, the amount of water is reduced. However, in the above method, an appropriate temperature cannot be obtained unless a certain period of time is reached after heating, which is not only inconvenient for the user, but also has the disadvantage that heating energy during that time is wasted.

The present invention eliminates such drawbacks, and the amount of heating is adjusted by a heating controller, and the amount of water flowing in excess of the maximum heating capacity is automatically limited to obtain a hot water outlet temperature equal to the set temperature. In order to achieve this objective, the present invention uses temperature detectors to detect the inlet water temperature and outlet temperature of the heat exchanger heated by the heating device, and set the outlet temperature. The heating controller is operated by the heating control section which calculates the signal from the exit hot water temperature setting section and the outlet water temperature signal, and the heating controller is operated to control the heating amount of the heating device. The water flow rate controller is controlled to an optimum water flow rate by driving a drive device for a water flow rate controller in proportion to the deviation signal between the signal and the hot water temperature signal, and an embodiment 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 flush chamber 6. The end 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 it toward the flush chamber 6. −
The water flowing into the washing chamber 6 passes through a differential pressure generating section 13 formed by a differential pressure hole 1o, 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.

- A regulating valve 17 is provided in the first communicating passage 16 that communicates the washing 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 17. By adjusting the pressure in the secondary chamber 8, the control valve 4 is displaced and the water volume is increased. can be controlled. 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 quantity 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, 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 includes a hot water temperature setting section 28, a heating control section 29, a water flow control section 30. The water flow control section 3o includes a water flow initial control section 30a and a water flow recontrol section 30b, and the hot water temperature is controlled by a hot water temperature setting section 28 and a hot water temperature detector 23, each consisting of a variable resistor, etc. The respective signals are calculated by the heating control unit 29, and the heating controller 25 is driven by known PID control, and the output temperature of the heat exchanger 14 is kept constant by adjusting the calorific value of the heating device 26. For water flow control, the signals from the outlet hot water temperature setting section 28 and the inlet water temperature detector 22 are calculated by the water amount initial control section 30a, and a signal proportional to the deviation between the outlet hot water temperature setting signal and the inlet water temperature signal is sent to the drive device 21.
Output to.

The capacity of the heating device 26 (including the capacity of the heat exchanger 14) is set in the water amount initial control section 30a, and the capacity of the heating device 26 (including the capacity of the heat exchanger 14) is set.
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, 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 water amount recontrol unit sob, which calculates the output via the water flow control unit sob, sends out a signal proportional to the deviation signal between the output hot water temperature setting signal and the output hot water temperature signal, and drives the drive device 21.

Further, a signal from the heating amount detector 25a is transmitted to the water amount recontroller 3ob via a timer 31.

The water amount recontrol unit 30b compares the signals from the hot water outlet temperature setting unit 28 and the hot water outlet temperature detector 23, and when the hot water outlet temperature is lower than a predetermined amount, drives the drive device 21 to reduce the water amount,
Based on the signal from the heating amount detector 25a, the driving device 21 is driven to increase the amount of water when the heating amount is a predetermined 1 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 amount initial control section 30a, 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. The water amount initial control unit 30a sends 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, and the control valve 1 is rotated to initialize the water amount. Let's do it. Water flow controller 1
The amount of water is set by the control valve 17, and then 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 outlet hot water temperature with respect to the outlet hot water temperature setting is calculated by the water amount recontroller aob using the respective signals of the outlet hot water temperature setting section 28 and the outlet hot water temperature detector 23 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. The water amount re-control unit 30b drives the drive device 21 in proportion to the temperature difference between the set hot water tap temperature and the actual hot water tap temperature, thereby reducing 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 temperature of the hot water increases. 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 initializing the water volume by detecting the incoming water temperature or resetting the water volume by detecting the hot water temperature, that is, if the water volume is controlled to be less than the heating capacity, the heating controller 25 adjusts the outlet water temperature. It becomes equal to the set temperature. However, at this time, the amount of heating is not the maximum, but a value that is somewhat reduced compared to the maximum capacity. The amount of heating can be detected, for example, by the voltage applied to the heating controller 25.

That is, when the heating amount detector 25a detects that the heating amount is reduced by a predetermined amount from the maximum heating amount, the drive device 21 is driven in proportion to the deviation between the maximum heating amount and the actual heating amount. The amount of water in the water amount controller 1 is increased.

Due to this increase in the amount of water, the heating amount of the heating device 26 reaches its maximum capacity while maintaining the tapped water temperature at the set temperature.

In order to limit the amount of water by the user, it is necessary to control the hot water temperature and adjust the capacity of the heating device 26. 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 a temperature detector, calculates the signal of the outlet temperature setting unit and the outlet temperature in the heating control unit, and controls the heating controller. Since the water flow rate is controlled in proportion to the temperature deviation between the hot water setting temperature and the incoming water temperature of the hot water temperature control type water heater, or in proportion to the temperature deviation between the hot water temperature setting and the hot water temperature, the water flow rate is stabilized at the optimum water level. It takes less time, and there is less waiting time to get the set hot water temperature. Since the amount of water was controlled by detecting the amount of heating, it was possible to control the amount of water to the optimum amount at the maximum amount of heating, and when the amount of heating became less than the maximum amount of heating, the amount of water was controlled in proportion to the deviation from the maximum amount of heating, so in this case as well. This has the effect of shortening the time required to stabilize the amount of water at the optimum level.

[Brief explanation of drawings]

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.
・Water flow controller, 14...Heat exchanger, 21...
... Drive device, 22 ... Inlet water temperature detector, 2
3... Hot 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, 30 a - Water flow initial calculation section, 3ob ... Water flow recontrol Part, 31...
...Timer, 32... Drive direction detection section,
33...Water amount setting section, 34...Water amount control section.

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 hot water supply controller includes a heating controller for the heating device, a heating controller for controlling the heating controller, a hot water outlet temperature setting unit, and a water flow rate control unit, and the water flow rate control unit is connected to the hot water outlet temperature setting unit and the water flow rate control unit. A fluid heating control device that controls the driving device in proportion to a deviation signal from a water temperature detector or in proportion to a deviation signal between the hot water temperature setting unit and the hot water temperature detector. (2) The water flow control section includes a water flow initial control section that calculates signals from the hot water outlet temperature setting section and the inlet water temperature detector, and a water flow recontrol section that calculates the signals from the hot water temperature setting section and the hot water temperature detector through a timer. 2. A fluid heating control device according to claim 1, which comprises: (3) The fluid heating control device according to claim 2, wherein the water amount recontrol section controls the water amount in proportion to the deviation of the signal from the heating controller from the maximum heating amount. (4) The fluid according to claim 3, wherein the water amount recontrol unit decreases the water amount when the outlet temperature is lower than the set temperature by a predetermined amount, and increases the water amount when the heating amount is smaller than the maximum heating amount by a predetermined amount. Heating control device.