JPS6246160A - Hot-water supplier - Google Patents

Abstract

PURPOSE:To permit to maintain the performance of hot-water supplier in spite of the deterioration with age of heat exchanging efficiency of heat exchanging section or the capacity of a proportional valve by a method wherein a correcting circuit, correcting the maximum opening degree and the minimum opening degree of the fuel proportional valve by the amount of supplying hot-water obtained by a water amount sensor and entering water temperature as well as discharging hot-water temperature obtained by a temperature sensor during supplying hot-water, is provided in the hot-water supplier. CONSTITUTION:An output operating circuit 13 outputs an actual hot-water supplying output (q) by (discharging hot-water temperature - entering water temperature) X amount of supplying hot-water. An output limiting circuit 14 inputs a voltage, set by the output voltage of a proportional control circuit 11, the output (q) of the output operating circuit 13, a resistor 15, fixing the minimum output, and the resistor 16, fixing the maximum output, and outputs a proportional valve driving minimum voltage V1 and a proportional valve driving maximum voltage V2, inputted into a voltage limiting circuit 12. The voltage limiting circuit 12 limits the output of the proportional control circuit 11 so as to be V1 or higher and V2 or lower whereby a proportional valve driving voltage Ve is obtained. According to this method, the maximum and minimum hot-water discharging outputs may be maintained so as to be the same as initial outputs in spite of the deterioration with age of the gas supplying capacity of the proportional valve or the heat exchanging efficiency of heat exchanging section.

Description

[Detailed description of the invention] <Industrial field of application> The present invention provides a method for controlling the supply of fuel such as gas by adjusting the supply N of fuel such as gas.
The present invention relates to a proportional water heater that can obtain all of the hot water at the desired set temperature regardless of whether the hot water has arrived.

<Prior art> Figure 3 shows the configuration of a water heater. 1 is the hot water supply channel,
2 is a water liquid sensor installed in the water supply channel to detect the hot water supply, 3 is an inlet water temperature sensor that detects the inlet water temperature, 4 is a heat exchange section, 5 is an outlet hot water temperature sensor that detects the outlet water temperature, and 6 is a fuel # + Fuel supply path, 7 is a fuel proportional valve that adjusts fuel such as gas amount, 8 is a hot water outlet temperature control circuit, 9 is a temperature setting circuit, and the hot water outlet temperature control circuit 8 is set by the temperature setting circuit 9. Hot water leakage trap The hot water temperature detected by the hot water temperature sensor 5 quickly coincides with the hot water temperature and becomes stable. Performs all arithmetic processing and controls the voltage that fully drives the fuel proportional valve Z.

However, in order to perform heat exchange by burning the gas supplied by the fuel proportional valve 7 in the heat exchange section 4, problems occur such as damage to the heat exchange section 4 at the upper limit of the heat exchange amount and stoppage of gas combustion at the lower limit. do. FIG. 2 shows a conventional configuration of a temperature control circuit to solve these problems. 11 is a proportional control circuit, 1
2 is a voltage limiting circuit, 17 is a semi-fixed resistor for setting the minimum voltage for driving the proportional valve, and 18 is a semi-fixed resistor for setting the maximum voltage for driving the proportional valve. The driving voltage Vl that can be obtained is set by the full semi-fixed resistor 17, and the driving voltage that can obtain the maximum gas amount V2 f
It is set using a semi-fixed resistor 18, and the voltage limiting circuit 12 limits the proportional valve drive voltage to Vt when the output voltage of the fully proportional control circuit 11 is less than Vl, and to V2 when it is 72 or more. Is there a problem in the thermal dust section? It is prevented.

<Problems to be solved by the invention> This conventional method absorbs the variation between the proportional valve and the thermal section. In order to achieve this, it is necessary to set the maximum and minimum values of the proportional valve drive voltage using a semi-fixed resistor while monitoring the hot water output while burning to the very limit. Performance cannot be maintained unless the heat exchange efficiency changes over time and is reset.

<Means for Solving the Problems> FIG. 1 shows the configuration of a hot water outlet temperature control circuit according to the present invention. 15
14 is an output calculation circuit that calculates the total actual hot water output of the water heater, 14 is an output limiting circuit that calculates the maximum and minimum proportional valve part @ voltage from the actual hot water output and proportional valve part @ voltage, 15 is a resistor that sets the total hot water supply minimum output, Reference numeral 16 denotes a resistor for setting the maximum hot water supply output, and the output calculation circuit 13 outputs the actual hot water output q based on (output hot water temperature - incoming water temperature) x hot water supply amount. The output limiting circuit 14 includes a resistor 15 that fixes the output voltage NU of the proportional control circuit 11, the output q of the output calculation circuit 15, and the minimum output Ql, and the maximum output Q2k.
A voltage n set by a fixed resistor 16 is inputted, and a proportional valve driving minimum voltage Vl and a proportional valve driving maximum voltage V2 inputted to the voltage limiting circuit 12 are outputted. Voltage limiting circuit 12
Accordingly, the output Ntf of the proportional control circuit 11 is limited to not less than V1 and not more than V2, and the proportional valve drive voltage Vl is set.

The output limiting circuit 14 controls the proportional valve drive voltage Vt to obtain the minimum output Q+ set by the resistor 15 and the proportional valve drive voltage V2 f to obtain the maximum output Qz set by the resistor 16. It can be corrected sequentially using the output Nt of the circuit 11 and the hot water number qK determined by the output calculation circuit 15.

Example FIG. 4 shows an embodiment of the present invention. 21 is a pulse shaper.

22 is a microcomputer, 23 is a Mohe converter, 24 is a variable resistor for temperature setting, 25.27 is a reference resistor for voltage comparison,
26 is a thermistor for detecting incoming water temperature, 28fl is a length mister for detecting hot water outflow, 29 is an analog multiplexer, and 60 is 4
It is a converter. The flow rate pulse detected by the water flow rate sensor is shaped by a pulse shaper 21 and input to the PA of a microcomputer 22. The microcomputer calculates the number of pulses for a certain period of time and converts it into a hot water supply amount. The set temperature set by the variable resistor 24 and the inlet water temperature and outlet temperature detected by the thermistors 26 and 28 are selected by the analog multiplier 29 based on the output of the PD of the microcomputer 22. The digital values are converted into digital values by the converter 50 and inputted from the PB of the microcomputer 22. The proportional valve output voltage obtained after calculation within the microcomputer is output from the PC of the microcomputer 22 to the converter 25, where it is converted into an analog value and becomes the proportional valve output.

The proportional control circuit 11, voltage limiting circuit 12 shown in FIG.
All functions of the output calculation circuit 16 and output control circuit 14 are →
The data is processed within the icon and stored within the microcomputer as minimum output value Ql and maximum output value Ch'd data.

Set temperature Tset, water inlet temperature Tir, hot water outlet temperature Tout
and feed weight FK4 proportional valve drive voltage Nt = G (Ts
etc.

Tir, Tout, F). Seki aG
is a function to approximate ToutfTset, and uses the PiD method or the like.

Proportional valve drive voltage N71 is N if Vl≦Nt≦V2
t, and if Nt<V+, then V1 toshi and Nt>V2 Naraba v2. In this way, the minimum proportional valve drive voltage Vl
and the maximum proportional valve part pjJ voltage V2, the hot water temperature T
out can be brought close to the total set temperature Tset.

Also, when the hot water temperature is stable, (Tour-Tin) X F is calculated as the actual hot water output q, the minimum output 1 shift Qr, and the maximum output Q.
2, if (: + q > Ql and Nt < Vl, do not reduce V.

(it) If q<Ql, increase Vl.

(iii) If q < Q2 and Nt>Vl, ■
2 Total increase.

(iV) If q > Q2, Vl k will not decrease.

(Adding the four values (() to (1v) in row 5) to the voltage obtained by the proportional valve drive minimum voltage V+k minimum output value Qr,
Proportional valve driving maximum voltage V2k can be brought close to and maintained at the voltage obtained by maximum output value Q2.

<Effects of the Invention> As described above, if the present invention is incorporated, it will not only be possible to eliminate the need for the complicated work of fully adjusting the maximum and minimum openings of the proportional valves while checking the hot water output manually. , the maximum and minimum hot water output can always be maintained at the same level as the initial state, even when the gas supply capacity of the proportional valve and the heat exchange efficiency of the heat exchanger change over time. You can make 7 machines.

[Brief explanation of drawings]

FIG. 1 is a block diagram of the temperature control circuit of the water heater of the present invention;
FIG. 2 is a block diagram of a conventional temperature control circuit, FIG. 3 is a block diagram of a gas hot water supply stirring system, and FIG. 4 is a circuit diagram showing an embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Water supply channel, 2... Water sacrifice sensor, 6... Incoming water temperature sensor, 4... Heat exchange part, 5... Hot water temperature sensor, 6... Fuel path, 7... Fuel proportional valve, 8... Hot water temperature control circuit, 9... Temperature setting circuit. Agent Benkonju Kunihiko Wakabayashi - 5 Go: D - Diagram 3 Procedural Amendment (Voluntary) March 31, 1985

Claims (1)

[Claims] 1. A water flow sensor installed between the water supply channel and the water supply channel, a heat exchange section provided midway through the water supply channel, and a temperature sensor installed at the inlet and hot water outlet sections of this heat exchange section to detect the inlet water temperature and hot water outlet temperature. A sensor, a fuel path for supplying fuel to the heat exchange section, a fuel proportional valve installed in the fuel path to adjust the flow rate of fuel, a temperature setting circuit to set the hot water temperature, and a water flow rate detected by the water flow sensor. In the water heater having a hot water outlet temperature control circuit that adjusts the opening degree of the fuel proportional valve so as to obtain the hot water outlet temperature set by the temperature setting circuit based on the amount of hot water supplied and the inlet water temperature and outlet water temperature detected by the temperature sensor, A water heater characterized by having a correction circuit that corrects the maximum opening degree and the minimum opening degree of the fuel proportional valve during hot water supply according to the hot water supply amount obtained by the water flow sensor and the incoming water temperature and hot water temperature obtained by the temperature sensor.