JPS60142114A - Controlling device of temperature of hot water feeder - Google Patents

Abstract

PURPOSE:To perform a control below the range of a burning amount enabling the safe burning of a burner and thereby to improve the safety, by providing a safety valve in parallel with a faucet and by controlling the temperature of fed hot water when an operation of the burning amount by a temperature controller shows that this amount is below the minimum burning amount. CONSTITUTION:Based on a signal TWI from a supplied water temperature detector 4, a signal TWR of a temperature setter 5 and a signal Fw1 of a water quantity detector, a temperature controller 3 determines a prescribed burning amount Qg, controls a supplied heat quantity controller 7, and opens a safety valve 9 provided in parallel with a faucet 8 when the result of an operation of the burning amount Qg turns to be below the minimum burning amount Qmin enabling the control of safe burning, so as to vary the quantity of water flowing through a heat exchanger and thereby to control the temperature of hot water fed from the faucet. This constitution works to enable the control of a temperature below the minimum burning amount of a burner and the attainment in a wide range of the quantity of water and the desired temperature set by a user. At the same time, an extraordinary high temperature of fed hot water caused when the quantity of supplied water is decreased is eliminated, whereby the safety is increased and the lifetime of the main body of a hot water feeder is prolonged.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is directed to the use of fjAs, which uses gas, oil, electricity, etc. as a heat source.
1 concerning the temperature control of a water heater that can obtain a set temperature even by automatically controlling the amount of hot water supplied.
Here, a temperature control device for a water heater that uses waste as fuel will be explained as an example.

Configuration of conventional example and its problems As shown in FIG.
The water is replaced with hot water and the field is supplied.

The temperature controller 3 receives a signal (TV,
I) and the signal (TWR) from the temperature setting device 5, find the deviation (TER=TWR-TWI) of the signal, and determine the predetermined combustion amount from the deviation TER and the signal (Fw1') from the water amount detector 6. is determined, and the supply heat amount controller 7 is controlled to control the outlet temperature (TWO). Combustion Elk Qg at this time is expressed by the following formula, where η is the heat exchange rate, η Qg = (TW'R-TWI) XF, N1
Therefore, if the heat exchange rate of the heat exchanger is taken into account, the output rFh temperature can be controlled. 1. However, in this configuration, as shown in Fig. 3, the range of combustion amount that can be stably controlled by the performance of the burner itself is the minimum combustion amount Q m
i n to the maximum combustion amount Qmax. Therefore, the hot water temperature is determined naturally.

For example, even though the temperature is set at point a, if the water volume is reduced to point b, the outlet temperature will reach point 0. If the set temperature and outlet temperature differ in this way, the product becomes very inconvenient for the user.

Furthermore, if high-temperature water comes out, there is a problem in that the life of the water heater itself is shortened, which is extremely dangerous.

Further, temperature control using P-1-D control or the like also has these problems.

OBJECTS OF THE INVENTION The present invention solves such conventional problems, and aims to control the combustion amount within a range that allows stable combustion in a burner.

Structure of the Invention In order to achieve this object, the present invention provides a safety valve in parallel with the faucet in order to control the hot water temperature when the result of calculating the combustion amount (Qg) with the temperature controller is below Q min. This is what was installed. This configuration has the effect of making the amount of water flowing through the heat exchanger variable and controlling the faucet outlet temperature to below Qmin.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. Note that the same members as in FIG. 1 are given the same numbers.

A heat exchanger 2 converts the combustion heat from the burner into hot water and supplies hot water. The temperature controller 3 uses the signal (TWI) from the inlet water temperature detector 4, the signal (TWR) from the temperature setting device 5, and the signal (Fwl) from the water flow sensor to set a predetermined combustion amount (Q).
g) and controls the supply heat amount controller 7. When the calculation result of the combustion amount Qg mentioned above becomes less than the minimum combustion amount (Qmin) for stable combustion control, open the safety valve 9 installed in parallel with the water faucet 8 and change the amount of water flowing through the heat exchanger. The temperature of hot water from the faucet is controlled by FIG. 4 shows the control below Q min .

Qg--・(TWRTV I)・Fwl=-・i
l) When η Qg≦Q min, for example, if the amount of heat at point A is set, TWI is constant, so (TWR-TWI
) depends on the set temperature TWH, or the temperature rises to 0 point because the combustion is below Qmin. Therefore, the amount of water can be changed from point b to point d, and can be controlled within the range that can be controlled by the temperature controller, and the installed foot temperature a can be maintained.

At this time, the water i (Fw2) flowing through the safety valve is determined by the following equation.

r) ・Qmin=(Fw1+Fw2)(TWR-TW
I) It is possible to control the burner in a range B where the burner can be stably controlled through deformation. FIG. 5 shows the temperature control algorithm in the temperature controller. Masu, TWR.

TWI(!l:FW1 is detected, and Qg is calculated by equation (1).
I put it on. Next, Qg and Q min are compared to determine whether they are large or small. When Q g ,, pQ min ,
When the temperature controller sends the amount of waste corresponding to Qg to the burner from the temperature controller to the burner, Q g '' Q min is calculated as Fw from equation (2).
Add 2. Next, the safety valve is controlled by the temperature controller so as to allow an increment of Fw2 to flow, and the supply heat amount controller is controlled so that Q m i
The amount of gas corresponding to n is sent to the bar and burned.

In order to realize such a control device, methods such as management and execution of programmable control laws using a microcomputer, which have been widely used in recent years, and combinations of driving parts of each element may be considered.

Effects of the Invention As described above, the water heater temperature control device of the present invention has the effect of making it possible to control the temperature below the minimum combustion amount of the burner, and the following effects can be considered. The water amount and temperature set by the user can be obtained over a wide range, and when the water is squeezed out, the hot water temperature does not reach abnormally high temperatures, increasing safety and prolonging the life of the Eshinki body.

[Brief explanation of drawings]

Fig. 1 is a block diagram of a conventional gas water heater, Fig. 2 is a block diagram of a gas water heater according to an embodiment of the present invention, Fig. 3 is a diagram showing the performance characteristics of a conventional water heater, and Fig. 4 is a diagram of the present invention. In water heaters with a capacity below the minimum combustion amount, 1--Burner, 3--Temperature controller, 4--Incoming water temperature detector, 5--
Temperature setting device, 6... Water amount detector, 7... ・Supplied heat amount controller, 9... Safety valve. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Fig. 2 factor Fig. 3 Tono ni -1ko Fig. 4 71 ((

Claims (1)

[Claims] An inlet water temperature detector, a temperature setting device, a supply heat amount controller,
a water amount detector, a safety valve that is piped in parallel with the faucet and adjusts the amount, and a deviation (TER) between the temperature setting device signal (TWR) and the water input temperature sensor signal (TWI); and a temperature controller that controls the heat amount controller depending on a signal (FW) of a water amount detector, and the temperature controller is configured to control when the amount of combustion becomes below the minimum combustion amount that can stably control the combustion of the burner. , a temperature control device for a water heater configured to control the safety valve.