KR950003818B1 - Temperature controller for boiler - Google Patents

Abstract

The method and apparatus is for preventing the temp. of the warm water from abruptly going up by converting the combustion control into warm water sensing thermistor control if a predefined time has passed after the warm water reaches a predefined temp just under the boiling point. The apparatus comprises warm water temp detectors(101,102) receiving the signals of the thermistors(8,10) via temp deteting means(12,13); one comparator(104) comparing the temp of circulation water with a set temp; the other comparator(105) comparing the temp of the warm water with a set temp; a combustion operation driver(106) determining a main operation according to the signals from the thermistors and the temp. comparators; and a combustor(107) directly operating the combustion based on the signal of the combustion operation driver(106).

Description

Hot water temperature control method of boiler and its device

1 is a block diagram of a device of the present invention.

2 is a schematic configuration diagram of a gas boiler to which the present invention is applied.

3 is a flowchart for explaining the method of the present invention.

* Explanation of symbols for main parts of the drawings

1: control unit 2: burner

4: secondary heat exchanger 8, 10: dummy

11: temperature control part 12, 13: temperature detection part

101: circulating water temperature recognition unit for hot water heating 102: hot water temperature recognition unit

104: circulating water temperature / boiling temperature comparison unit 105: tapping temperature / set temperature comparison unit

106: combustion calculation drive unit 107: combustion execution unit (107)

108: functional part control unit

The present invention relates to a hot water temperature control method and apparatus therefor in a one-pipe two-channel or two-pipe two-channel boiler, in particular, a state in which the tapping temperature of the hot water circulating water is above a predetermined temperature (X ° C), which is a temperature point just before boiling. After a certain period of time, the main pipe combustion control by the dummyster to detect the hot water tapping temperature is switched to the main pipe combustion by the dummyster to detect the temperature of the hot water circulating water. The present invention relates to a method and apparatus for controlling hot water temperature of a boiler so as to prevent damage in advance.

In the conventional boiler, the hot water outlet temperature is controlled by installing a dummy detector for temperature detection in the hot water outlet pipe, and the combustion is performed by using a boiling-proof bimetal that is driven when the water temperature of the hot water circulating water (also called intermediate water) increases. Combustion was turned off or the dummy was installed at the outlet of the primary heat exchanger to turn off the combustion and to reduce the gas output in multiple stages to reduce the amount of gas released.

That is, the hot water temperature was controlled to match the set value of the temperature control unit by controlling the control valve with a comparison value between the set value of the temperature control unit and the dummyster installed in the hot water pipe.

Here, the circulating water for hot water heating is a circulating water used as a means for heating direct water in a boiler in order to adjust the temperature of hot water to a user's set value. The primary heat exchanger → thermistor → three sides → secondary heat exchanger → pump → re The circulation of the primary heat exchanger refers to circulating the primary heat exchanger, and boiling of circulating water means that when the hot water temperature setting of the temperature control unit is the highest temperature while the temperature of the direct water is high and the direct water amount is the minimum quantity of hot water operation (eg, 1.81 / min), In order to tap the hot water temperature set point, it refers to the phenomenon that hot water circulation water is circulated to high temperature and occurs in the primary heat exchanger.

In addition, as an example of boiling water, when the amount of direct water taps into a proper amount and suddenly decreases to a small amount (for example, when the faucet is reduced), the change in the control speed of the control valve due to the detection speed of the dummyster installed in the hot water pipe Since the circulating water for hot water heating is instantaneously boiled in a few seconds, or when the tap water temperature detection of the hot water is different due to the characteristics of a dummyster that detects the hot water tapping temperature, the condition of the control valve is unstable in the controller. The boiling water circulating water for boiling water is generated, and in the conventional boiler, the gas is blocked by detecting the temperature of the circulating water for hot water heating through a dummyster installed on a pipe through which a bimetal for preventing overheating or the circulating water for hot water heating is circulated. Alternatively, the boiling temperature of the circulating water for hot water heating was controlled by dropping the gas volume in multiple stages (for example, from a large output to a small output).

However, such a control method has a problem in that the hot water is suddenly changed when the user uses hot water and the hot water is heated, and in the case of the bimetal, the boiling phenomenon is intensified due to the late boiling temperature detection time, resulting in burnout or boiling noise of the heat exchanger. There was a problem that occurred.

An object of the present invention is to prevent the sudden change of temperature of the hot water circulation water to prevent the damage of the heat exchanger in advance by eliminating the extinguishing phenomenon or the sudden decrease in gas output while adjusting the boiling phenomenon control in the boiler to proportional control. To prevent it.

The purpose of the above is to detect whether the temperature of the hot water circulating water circulates for a predetermined time or more in a state where the temperature of the hot water circulating water is above a predetermined temperature (X ° C.), which is just before boiling, and when the temperature of the hot water circulating water is above a predetermined temperature, hot water is hot The main pipe combustion control by the dummyster detecting the temperature can be achieved by switching to the main pipe combustion by the dummyster detecting the temperature of the circulation water for hot water heating.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

The hot water temperature control device of the present invention, as shown in Figures 1 and 2, the control unit (1) connected to the temperature control unit 11 to perform the overall control function of the boiler; A combustor (2) composed of a burner group (21) and a primary heat exchanger (22) to combust a gas to heat heating water or hot water; A water tank 3 for storing heating circulation water; A secondary heat exchanger 4 having different paths for circulation of hot and cold water; An exhaust section 5 for exhausting the exhaust gas; A circulation pump 6 for circulating the hot water circulation water; Bimetal 7 for overheat prevention; Dummyster 8 for detecting the temperature of the hot water circulation water; A control valve 9 for controlling the supply amount of gas; In the boiler which consists of a dummyster 10 which detects the tapping temperature of hot water, in the microcomputer 1 'of the said control part 1, the dummyster 8 and 10 which detect the tapping temperature of the hot water circulating water for hot water and the tapping temperature of hot water. Hot water circulating water and hot water temperature recognition unit (101, 102) for receiving the output signal of the) through the respective temperature detectors (12, 13) to recognize the temperature of the hot water circulating water and the tapping temperature of the hot water; The temperature of the hot water circulating water for circulation and the temperature immediately before boiling, which are controlled by the timer 103 that counts the output signal of the oscillator 14 and output from the hot water heating purified water temperature recognition unit 101 Circulating water temperature / boiling temperature comparison unit 104 for comparing the mutually; Under the control of the timer 103 and receiving the output signal of the temperature control unit 11 through the data transmission and reception unit 15 and at the same time output signals of the hot water heating circulation water and hot water temperature recognition unit (101, 102) A tapping temperature / set temperature comparing unit 105 for comparing the tapping temperatures Tout1 and 2 of the hot water circulating water and hot water with the input and the set temperature Test of the user; Dummysters (8, 10) for receiving the output signals of the circulating water temperature / boiling temperature comparison unit 104 and the tapping temperature / set temperature comparison unit 105, respectively, and detects the tapping temperature of the hot water circulating water and hot water A combustion calculation drive unit 106 for determining the subjective operation by means of; A combustion execution unit 107 which directly executes the subjective operation by the dummyster 8 and the dummyster in accordance with the output signal of the combustion calculation drive unit 106; It is provided with a functional part control unit 108 for receiving the output signal of the combustion execution unit 107 to control the opening and closing amount of the control valve 9 through the output signal group 109 and the gas control unit 16.

The temperature control unit 11 and the hot water temperature setting unit 111 for setting the user's hot water temperature; It consists of a hot water temperature sending unit 112 for transmitting the output signal of the hot water temperature setting unit 111 to the data transmission and reception unit 15.

On the other hand, in the method of the present invention, as shown in FIG. 3, when the hot water use mode is selected while the boiler is burning, the temperature Tout1 of the hot water heating circulation water detected by the dummyster 8 is immediately before boiling. The temperature Tout1 of the hot water circulating water is lower than the temperature just before boiling (X ° C.) or the temperature of the hot water circulating water ( Although Tout1 is higher than the temperature just before boiling (X ° C.), if the predetermined time t1 is not maintained, the gas is proportionally controlled by subjective combustion by the dummytor 10 that detects the hot water tapping temperature Tout2. If the temperature Tout1 of the hot water heating circulation water is higher than the temperature immediately before boiling (X ° C.) and maintains the predetermined time t1, the gas proportional control of the main pipe combustion by the dummyster 10 is canceled and Gas proportional control of the main pipe 8 for detecting the tapping temperature Tout1 The temperature (X ℃) just before boiling, while continuing to detect whether the dummyster 8 maintains the predetermined time t2 while the detection temperature of the dummyster 8 is less than the temperature just before boiling (X ℃), and thus the tapping temperature of the circulating water When (Tout1) is lower than the temperature (X ° C) just before boiling, the flow returns to the process of proportionally controlling the gas by the main combustion by the dummyster 10, and then the hot water heating circulation detected by the dummyster (8). It is characterized by returning to a mode for detecting whether the temperature Tout1 of the water is maintained at a predetermined time t1 in a state higher than the temperature (X ° C) immediately before boiling.

Referring to the effect of the present invention made of such a configuration and method as follows.

First, when the hot water use mode is selected by the user during the combustion operation of the one-pipe two-channel boiler or the two-pipe two-channel boiler in the heating use mode, the circulating water temperature / boiling temperature comparison unit 104 in the microcomputer 1 'is a dummyster. The temperature Tout1 of the hot water heating circulation water detected by (8) and output through the hot water heating circulation water temperature recognition unit 101 and the temperature just before boiling (X ° C.) are compared with each other. Even if the temperature Tout1 of the hot water circulating water Tout1 is lower than the temperature just before boiling (X ° C.) or the temperature Tout1 of the hot water heating circulating water is higher than the temperature Tx immediately before boiling (X ° C.) When it is lowered again within t1), normal combustion for proportionally controlling the gas by subjective combustion by the dummyster 10 that detects the hot water tapping temperature Tout2 is performed.

That is, the conventional normal operation of proportionally controlling the gas is performed by comparing the user's set temperature (Tset) and hot water tapping temperature (Tout2).

However, if the temperature of the hot water circulating water (Tout1) is higher than the temperature just before boiling (X ° C) for a predetermined time (t1) for the reason that the amount of direct water suddenly decreases to a small amount, it is in a sharp boiling state. The gas proportional control by the main tube combustion of the dummyster 10 which was performed until now is canceled, and it switches to the main gas proportional control by the dummyster 8 which detects the temperature Tout1 of circulating water, and performs combustion control. However, the control subjective combustion by the temperature of the hot water circulating water for circulating water is performed by proportionally controlling the gas so that the temperature Tout1 of the circulating water can maintain the temperature (X ° C) just before boiling.

As described above, the time for proportionally controlling the gas by subjective combustion by the dummyster 8 that detects the temperature Tout1 of the circulating water is shortly before the temperature Tout1 of the circulating water detected by the dummyster 8 is boiling. It is until it maintains the predetermined time t2 in the state below temperature (X degreeC), and the tapping temperature Tout1 of the circulating water is the temperature just before boiling in the process of proportionally controlling the gas by the main combustion by the dummyster 8 ( When the state lower than X 占 폚 is maintained for a predetermined time t2, the main combustion (ie, the temperature Tout1 of the circulation water for hot water heating and the temperature just before boiling (X 占 폚)) by the dummyster 8 is mutually compared. Cancel the combustion control method to maintain the boiling temperature, and compare the main combustion by the dummyster 10 (that is, the user's set temperature Tset and hot water tapping temperature Tout2) to each other. To proportional control of gas) It is good.

That is, when the temperature of hot water circulating water for hot water heating is detected through the dummyster 8, when the temperature of X ℃, which is a temperature point just before boiling, is detected, the main combustion of the hot water tapping temperature is controlled by the temperature control of the hot water hot water circulating water. By controlling the gas volume by proportional control just before boiling to prevent boiling, the sudden drop in hot water temperature due to the boiling off 'off' or abrupt control of the gas output is prevented, and the hot water temperature is prevented in advance. In addition to reducing the high and low widths, damage to heat exchangers and the like can be prevented.

On the other hand, in the tapping temperature / set temperature comparison unit 105 in the microcomputer 1 ', the tap water heating circulation water and the tapping temperatures Tout1 and Tout2 of the hot water detected by the dummysters 8 and 10 are respectively detected. 12, 13 and the hot water circulating water and hot water temperature recognition unit 101, 102 and at the same time the output signal of the temperature control unit 11 through the data transmission and reception unit 15 circulating water for hot water heating And hot water tapping temperatures Tout1 and 2 and the set temperature Tset of the user are compared with each other, and the resultant values are sent to the combustion calculation driving unit 106 so that gas combustion by proportional control can be performed.

At this time, the circulating water temperature / boiling temperature comparison unit 104 is controlled by the timer 103 and boils with the temperature (Tout1) of the hot water circulating water for hot water heating circulation output from the hot water heating circulating water temperature recognition unit 101 The temperature of the direct bottom (X ° C) is compared with each other. As a result, when the circulating water temperature (Tout1) for hot water heating is less than the temperature (X ° C) just before boiling, the circulating water temperature / boiling temperature comparison unit 104 In the combustion calculation drive unit 106 under control, a dummyster 10 subjective operation is performed in which the user's set temperature Tset and the hot water tapping temperature Tout2 are compared with each other, and the gas supply is proportionally controlled. do.

However, the temperature (Tout1) of the hot water heating circulation water (Tout1) and the temperature immediately before boiling (X ° C) are compared with each other by the circulation water temperature / boiling temperature comparison unit 104. If a predetermined time t1 is maintained at a temperature higher than the temperature just before boiling (X ° C.), a predetermined control signal is outputted to the combustion operation driver 106. Therefore, the combustion operation driver 106 has a set temperature Tset and Canceling the main combustion of the dummyster 10 according to the hot water tapping temperature Tout2 and maintaining X ° C by the dummy gas 8 main gas proportional control by the control command of the circulating water temperature / boiling temperature comparison unit 104. It will drive.

At this time, the circulation water temperature / boiling temperature comparison unit 104 detects a state that the temperature (Tout1) of the hot water heating circulation water is less than the temperature (X ° C) just before boiling, and counted the above state by the timer 103 As a result, when the predetermined time t2 is maintained, the thermistor 8 main gas proportional control is canceled again, and the dummy gas 10 main gas proportional control is performed by the output value of the tapping temperature / set temperature comparator 105.

As described above, according to the present invention, when the temperature of the hot water circulating water is maintained for more than a predetermined time in a state of more than a predetermined temperature (X ℃), which is the temperature point just before boiling, subjective by the dummyster to detect the hot water tapping temperature By converting the combustion control into the main combustion by the dummyster which detects the temperature of the circulating water for hot water heating, the boiling phenomenon in the boiler is controlled by the proportional control and the sudden change of the gas output is controlled to control the circulating water for the hot water heating. It is possible to prevent sudden changes in temperature and to prevent damage to heat exchangers.

Claims (2)

In a one-pipe two-channel and two-pipe two-channel boiler, the temperature Tout1 of the hot water circulating water circulating water detected by the dummyster 8 is higher than the temperature immediately before boiling (X ° C) for a predetermined time (t1). ), The gas control method is switched from the main body of the dummyster 10 that detects the tapping temperature Tout2 of the hot water to the dummyster 8 main body that detects the tapping temperature Tout1 of the circulating water. If the temperature is less than the temperature (X ℃) just before boiling, if the predetermined time (t2) is maintained, the method of controlling the hot water temperature of the boiler, characterized in that the process consisting of returning to the original dummyster (10) subjective combustion. Temperature control unit 11, control unit 1, combustor 2, water tank 3, secondary heat exchanger 4, exhaust unit 5, circulation pump 6, bimetal 7 for overheat prevention, more In a one-pipe two-channel and two-pipe two-channel boiler composed of Mr (8) (10) and a control valve (9), in the microcomputer (1 ') of the control unit (1) hot water circulating water and hot water tapping The hot water temperature recognition unit 101 which receives the output signal of the dummysters 8 and 10 for detecting the temperature through the respective temperature detectors 12 and 13 and recognizes the temperature of the hot water circulating water and the tapping temperature of the hot water. 102); The temperature of the hot water circulating water circulating water and the temperature just before boiling, which are controlled by the timer 103 that counts the output signal of the oscillator 14 and output from the hot water circulating water temperature recognition unit 101. Circulating water temperature / boiling temperature comparison unit 104 for comparing the mutually; Under the control of the timer 103 and receiving the output signal of the temperature control unit 11 through the data transmission and reception unit 15 and at the same time output signals of the hot water heating circulation water and hot water temperature recognition unit (101, 102) A tapping temperature / setting temperature comparison unit 105 which receives the input and compares the tapping temperatures Tout1 and 2 of the hot water circulating water and the hot water to each other and the set temperature Tset of the user; Dummysters (8, 10) for receiving the output signals of the circulating water temperature / boiling temperature comparison unit 104 and the tapping temperature / set temperature comparison unit 105, respectively, and detects the tapping temperature of the hot water circulating water and hot water A combustion calculation driving unit 106 for determining the giving or driving by means of; A combustion execution unit 107 which directly executes the subjective operation by the dummyster 8 and the dummyster in accordance with the output signal of the combustion calculation drive unit 106; And a functional part control unit 108 which receives the output signal of the combustion execution unit 107 and controls the opening / closing amount of the control valve 9 through the output signal group 109 and the gas control unit 16. Hot water temperature control device of boiler.