JP3152407B2 - Water heater - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention includes a combustion amount calculating section,
The present invention relates to a hot water supply device capable of controlling the number of revolutions of a combustion fan according to the amount of combustion.

[0002]

2. Description of the Related Art In a conventional hot water supply device, a required heat amount calculating section for calculating a required heat amount based on a set temperature, a feed water temperature and a hot water supply amount, or a required heat amount correction based on the set temperature and an actual hot water supply temperature. A correction calorie calculation unit
2. Description of the Related Art There is known a hot water supply device configured to control the number of revolutions of a combustion fan in accordance with a required heat amount or a corrected heat amount.

[0003]

In the conventional hot water supply device, the number of revolutions of the combustion fan is controlled in accordance with the amount of heat required to obtain the set temperature and the corrected amount of heat. The actual combustion amount differs from the required combustion amount or the corrected combustion amount depending on the type (combustion amount) and the strength of the gas pressure.
Since the number of revolutions of the combustion fan is lower than the number of revolutions required for the actual combustion amount, incomplete combustion occurs due to insufficient air volume, and conversely, the gas burner burns out due to excessive air volume because it is higher than the required number of revolutions. There was a fear of doing.

As an example, FIG. 6 shows a characteristic diagram of the number (combustion amount) and the rotation speed of a conventional hot water supply device when the combustion amount is small or the gas pressure is weak. In the figure, when the correction number 10 is required to secure the actual number 8, the rotation speed is 1 even though the actual combustion amount is 8.
Since it corresponds to No. 0, the difference between the actual rotation speed and the required rotation speed as shown in the figure becomes excessive.

The present invention has been made to solve such a problem, and its object is to provide an air flow required for actual combustion even when the type of fuel used (gas combustion amount) and conditions (pressure level) are different. It is an object of the present invention to provide a hot water supply device capable of controlling the number of revolutions of a combustion fan necessary to secure the temperature.

[0006]

In order to solve the above-mentioned problems, a hot water supply apparatus according to the present invention has a hot water supply path provided with a heat exchanger.
And a combustion unit for heating the heat exchanger;
A water supply temperature sensor for measuring the water supply temperature Tc provided at the entrance side.
And a hot water supply temperature Th provided on the outlet side of the heat exchanger.
Hot water supply temperature sensor for measuring temperature and setting for setting the set temperature Ts
Section and a hot water supply detection system for detecting a hot water supply quantity Q flowing through the hot water supply path.
Outlet and fan speed to control the speed of combustion fan
A hot water supply device comprising: a control unit ;
A required number based on the feed water temperature Tc and the hot water supply amount Q
A required number calculating section for calculating the number of hot water , and
To correct the required number and calculate the corrected number
Number calculation unit, the hot water supply temperature Th, the water supply temperature Tc,
And actual number calculation for calculating the actual number based on the hot water supply amount Q
Section, and controls the valve opening of the proportional valve based on the number of corrections.
And , based on the actual number and the corrected number,
And controlling the number of revolutions of the fan .

Further, the hot water supply apparatus according to the present invention is characterized in that the number of revolutions of the combustion fan is controlled based on the ratio between the actual number and the corrected number.

[0008]

The hot water supply apparatus according to the present invention can obtain the number of revolutions of the combustion fan corresponding to the actual amount of combustion.

Further, the hot water supply apparatus according to the present invention can obtain the number of revolutions of the combustion fan corresponding to the actual combustion amount and the corrected combustion amount.

[0010]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a block diagram showing an example of a hot water supply apparatus according to the present invention. In FIG. 1, the hot water supply apparatus includes a required number calculation unit 1, a corrected number calculation unit 2, and a real number calculation unit 3.
A valve opening / burning amount conversion unit 4, a proportional valve control unit 5, a rotation speed / burning amount conversion unit 6, a fan rotation speed control unit 7, a gas proportional valve 8, a combustion fan 9, Heat exchanger 10, feed water temperature (Tc) sensor 11, hot water temperature (Th) sensor 1
2 and a water supply (Q) sensor 13.

The required number calculation unit 1 includes a combustion amount calculation unit 1A, and the required combustion amount required to obtain hot water at the set temperature based on the set temperature (Ts), the water supply temperature (Tc) and the hot water supply amount (Q). (Fs) is calculated, and required combustion amount (Fs) information 1a is output.

The correction number calculation unit 2 includes a PID calculation unit 2A and an adder 2B.
s) and the hot water supply temperature (Th), the PID calculation is executed, and the PID calculation information 2a is output. Adder 2B
Is the required combustion amount (Fs) output from the required number calculation unit 1.
Information 1a and PID calculation information 2a from PID calculation unit 2A
Is added to calculate the corrected combustion amount (Fo) to output corrected combustion amount (Fo) information 2b.

FIG. 3 is a detailed block diagram of the PID calculation unit. The PID operation unit 2A includes a proportional operation unit 21, an integral operation unit 22, a differential operation unit 23, and three operation units 21,
It comprises an adder 24 for adding the outputs of 22 and 23, and a limiter 25 for limiting the output value of the adder 24. The difference temperature Δ between the set temperature (Ts) and the hot water supply temperature (Th)
The three arithmetic units 21, 22, and 23 simultaneously perform the proportional, integral, and differential operations on Te, add the respective results, and output the result with a limiter so that the integrated value does not exceed a predetermined value.

FIG. 4 is a block diagram showing another embodiment of the correction number calculating section. The reciprocal of the required combustion amount (Fs) information 1a output from the required number calculation unit 1 and the set temperature (T
s) and the temperature deviation ΔTe between the hot water supply temperature (Th) and the PID calculation unit 2A, and multiplies a coefficient obtained by adding 1 to the required combustion amount (Fs) information 1a to obtain a corrected combustion amount (Fo). obtain.

FIG. 5 is a block diagram showing a further embodiment of the correction number calculating section. It comprises a coefficient output section and a multiplier. The required combustion amount (Fs) and the actual combustion amount (Fr) are input to the coefficient output section, and a coefficient αr is output. The coefficient αr has an initial value of 1 and usually has a value of Fs / Fr. Coefficient αr
And the required combustion amount (Fs) are calculated by a multiplier to obtain a corrected combustion amount (Fo = αr * Fs).

Next, the valve opening / burning amount converter 4 converts the corrected calorie (Fo) information 2b calculated by the correction number calculator 2 into valve opening information 4a corresponding to the combustion amount. The valve control section 5 outputs a valve control signal 5a corresponding to the valve opening information 4a to control the gas proportional valve 8 to adjust the amount of gas to be burned.

The actual number calculation unit 3 includes a combustion amount calculation unit 3A, and calculates an actual combustion amount (Fr) based on the hot water supply temperature (Th), the water supply temperature (Tc) and the hot water supply amount (Q). The actual combustion amount (Fr) information 3a is output.

The rotational speed / burning amount converter 6 converts the actual burning amount (Fr) information 3a from the actual number calculator 3 into rotational speed information 6a corresponding to the burning amount. The conversion amount of the rotation speed / burning amount converter 6 is set for a gas having a standard gas combustion amount and pressure assumed for a hot water supply device, and the set temperature (Ts) and the hot water supply temperature (Th) are usually set. It is configured to be equal. However, even when the combustion amount and gas pressure of the used fuel gas are different from the standard gas, the rotation speed information 6a
Is the actual hot water temperature detected by the hot water temperature sensor (Th)
Therefore, a rotation speed suitable for the actual combustion amount (Fr) can be obtained.

The difference between the set temperature (Ts) immediately after the hot water supply device is started and the hot water supply temperature (Th) due to the difference in the combustion amount and the gas pressure of the used fuel gas from the standard gas is calculated by the correction number calculating unit 2. Correction calculation is performed, and as a result, the combustion amount is controlled by controlling the gas proportional valve, and the hot water supply temperature (Th) is set to the set temperature (T
This is resolved by approaching s), and the rotation speed of the combustion fan can be obtained as in the case of setting the standard gas.

The fan rotation speed control unit 7 performs rotation speed control information 7 based on the rotation speed information 6a of the rotation speed / burning amount conversion unit 6.
a to control the number of revolutions of the combustion fan 9.

FIG. 2 is a block diagram showing another example of the hot water supply apparatus according to the present invention. The difference from FIG. 1 is that the combustion ratio (Fr / Fo) is based on the corrected combustion amount (Fo) information 2b from the corrected combustion amount calculation unit 2 and the actual combustion amount (Fr) information 3a from the actual number calculation unit 3. Is stored for a predetermined period of time, this value is stored, and the stored value is provided as combustion ratio (Fr / Fo) information 21a. Corrected combustion amount (Fo)
The point is that the rotation speed is converted into the rotation speed based on the information 2b and the combustion ratio (Fr / Fo) information 21a. The combustion ratio (Fr
/ Fo) The initial value of the information 21a is set to 1.

The rotational speed / burning amount converter 6 calculates the corrected burning amount (F
o) and the combustion ratio (Fr / Fo), the conversion is performed based on the multiplication, whereby (Fo) × (Fr / F
o) = Fr, that is, a rotation speed corresponding to the actual combustion amount (Fr) is obtained.

On the other hand, the rotational speed / burning amount converter 6 also has a valve opening degree /
The operation is performed based on the corrected combustion amount (Fo) information 2b in the same manner as the combustion amount conversion unit, so that both conversion units can be shared.

[0024]

As described above, the hot water supply apparatus according to the present invention can be used even when the type (combustion amount) and condition (gas pressure) of the gas fuel actually used are different from the assumed standard gas. To provide a safe hot water supply device that can obtain the number of revolutions of the combustion fan corresponding to the amount of combustion of the gas, so that there is no fear of incomplete combustion due to insufficient number of revolutions or extinguishing of the gas burner due to excessive number of revolutions. Can be.

Further, by obtaining the ratio between the actual combustion amount and the corrected combustion amount, the valve opening and the configuration of the rotation speed conversion unit can be shared.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an example of a hot water supply apparatus according to the present invention.

FIG. 2 is a block diagram of another example of the hot water supply apparatus according to the present invention.

FIG. 3 is a detailed block configuration diagram of a PID calculation unit.

FIG. 4 is a block diagram of another embodiment of a correction number calculation unit.

FIG. 5 is a block diagram of a correction number calculating unit according to still another embodiment.

FIG. 6 is a characteristic diagram of the number (combustion amount) and the rotation speed of a conventional hot water supply device.

[Explanation of symbols]

 1 Required Number Operation Unit 2 Correction Number Operation Unit 3 Actual Number Operation Unit 4 Valve Solving / Burnout Conversion Unit 5 Proportional Valve Control Unit 6 Revolution / Burnoff Conversion Unit 7 Fan Rotation / Burnup Conversion Unit 8 Gas Proportional valve 9 Combustion fan 10 Heat exchanger 11 Water supply temperature (Tc) sensor 12 Hot water supply temperature (Th) sensor 13 Water supply amount (Q) sensor

────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Toru Tsuruta 43-1, Uozakihama-cho, Higashinada-ku, Kobe-shi, Hyogo Prefecture Inside Nippon Yupro Corporation (72) Inventor Hiroshi Munemura 43-1, Uozakihama-cho, Higashinada-ku, Kobe-shi, Hyogo (56) References JP-A-59-221518 (JP, A) JP-A-1-263456 (JP, A) JP-A-4-363545 (JP, A) (58) Fields investigated ( Int.Cl. ⁷ , DB name) F23N 1/08 101 F23N 3/08 F23N 5/14 370

Claims (2)

(57) [Claims] A hot water supply passage provided with a heat exchanger;
A combustion section for heating the vessel, and an inlet section for the heat exchanger.
A feed water temperature sensor for measuring a measured feed water temperature Tc;
Hot water supply temperature for measuring hot water supply temperature Th provided at outlet side of exchanger
A sensor, a setting unit for setting a set temperature Ts, and the hot water supply
A hot water supply detecting section for detecting a hot water supply Q flowing through a road;
A fan speed control unit for controlling the fan speed.
That a hot water supply device, and the set temperature Ts and the water temperature Tc and the hot water supply amount Q required scale number to calculate the required scale number on the basis of the calculation unit, the number of the required No. corrected based on the hot water temperature Th with a correction scale number calculating unit for calculating a correction scale number, the actual scale number calculating unit for calculating the actual scale number on the basis of the hot water temperature Th and the water temperature Tc and the hot water supply amount Q Te, based on the correction scale number It controls the valve opening of the proportional valve, water heater and controls the rotational speed of the fan for combustion on the basis of the actual number of scale number and the correction degree. 2. The combustion engine according to claim 2, wherein the ratio of the actual number to the correction number is used.
The number of revolutions of the fan is controlled.
The hot water supply device according to 1.