KR20000032720A - Method for controlling boiler when three-way valve is out of order - Google Patents

Abstract

PURPOSE: A controlling method of a boiler is provided to control the operation mode of a boiler even when a three-way valve is out of order, to prevent damage of a heat exchanger by displaying the error and to make a user recognize the error of a boiler. CONSTITUTION: A boiler(100) is operated in hot water generating mode and in heating mode by the setting of a user. In the heating mode, a three-way valve is converted to the heating mode, a gas valve(105) is opened and gas is ignited in a burner installed in a heating part(102). Thus the temperature of the water passing a heat exchanger(101) rises. The heating water is flowed into the heat exchanger by a pump(107) along the direction A, and returns to an expansion tank(103) via a heating water return pipe after circulating respective rooms with heater supply pipes along the direction C. In the hot water generating mode, the three-way valve is converted to the hot water generating mode, the heating water is circulated in the boiler by the pump along the direction B, and flowed into the heat exchanger via a direct water pipe. Thus, the water is erupted via a hot water supply pipe after being increased in its temperature. If the mode is not converted due to the disorder or the inability of operation of the three-way valve while operating, a set up temperature(Tp) is compared to a measured temperature(Ts). If the set up temperature is higher than the measured temperature, the error is displayed on a display window of a room controller. Thereby, the damage of the heat exchanger is prevented.

Description

Boiler control method in case of 3-way valve failure

The present invention relates to a boiler control method when a three-way valve failure, in particular, when the user is equipped with a temperature sensor in the hot water pipe is set to the heating mode by detecting the temperature change with time in the combustion and extinguishing state of the boiler and the rate of change If the user sets the hot water mode, and compares the user's set temperature and the measured temperature, the operation mode of the boiler is controlled even when the three-way valve fails. The present invention relates to a boiler control method in case of a three-way valve failure that prevents damage and recognizes a failure state of the boiler.

In general, domestic gas boilers are designed to reduce the size of large boilers used for industrial purposes and add various control functions to supply heating and hot water in general households due to the development of heat engines. At first, coal or oil was used as a fuel to operate the boiler, but as the supply of city gas became more common, the demand for gas boilers increased rapidly.

Such household gas boilers are divided into various types according to the installation type, the hot water supply method, the exhaust method, and the circulation of the heating water. However, the domestic gas boilers are generally divided according to the installation type and the hot water supply method. As described above, it is divided into a wall-mounted type and a floor-mounted type according to the installation type, and divided into an instant type and a water type according to the hot water supply method.

1 is a schematic view of a conventional gas boiler. Referring to the structure of a general gas boiler with reference to the drawings, the interior of the domestic gas boiler is a gas pipe, a heating supply pipe, a heating return pipe, a direct water pipe, and a hot water pipe. The gas pipe is equipped with a gas valve (5) for controlling the supply of gas, and burner (4) ignited by the transformer (6) to burn the gas flowed through the gas pipe to obtain heat The built-in heating part 2 is attached. The upper part of the heating part 2 is integrally coupled to the heat exchanger 3 piped with the heating tube and the hot water pipe alternately, and the internal combustion action of the heating part 2 is applied to the upper part of the heat exchanger 3. Inlet port 14, exhaust port 15 and fan 16 are mounted for smoothing.

The expansion tank 9 equipped with the float switch 10 for detecting the water level is connected to a supplemental water pipe equipped with a heating supply pipe, a heating return pipe, an overflow pipe, and a supplemental water valve 11. And the other end of the supplemental water pipe is connected to the straight pipe. The overflow pipe is discharged out of the water to maintain a constant pressure in order to prevent the failure of other components when the volume expansion of water occurs due to the temperature rise.

The heat exchanger 3 is piped with a heating water pipe, a direct water pipe and a hot water pipe, and the heating water pipe (part connected to the heating supply pipe) has a temperature sensor for preventing overheating of the boiler 1 at a position close to the heat exchanger 3. (8) is attached. In addition, the boiler 1 is also equipped with a three-way valve 12 for switching the flow of the heating water in the heating mode / hot water mode and a pump 7 for generating the flow of water to the heat exchanger (3) The flow pipe 13 is mounted on the water pipe to detect the flow of water. In addition, the switch, the sensor and the valve serves as a safety device to prevent the risk caused by the abnormal operation of the boiler.

However, in such a boiler (1), if the three-way valve 12 is fixed in the heating mode due to a failure, the user can not obtain hot water of the desired temperature, the room temperature rises by performing the heating function in summer When the three-way valve 12 is fixed in the hot water mode, the heating function is lost, and the temperature of the water in the pipe circulating inside the boiler 1 rises sharply, which causes the safety device to operate frequently. There is a problem that causes damage to the heat exchanger (3). In this case, the heat sensor 3 is set in consideration of the time taken for the set temperature to be transferred and the time for the heat exchanger 3 to be heated during the temperature sensor 8 detecting the set temperature to prevent overheating. The problems are even greater because they are heated to a temperature higher than the temperature.

Accordingly, an object of the present invention is to solve the above-mentioned drawbacks, and when the user sets the heating mode by mounting the temperature sensor on the hot water pipe, the temperature change with time is detected in the combustion and extinguishing state of the boiler to compare the value of the change rate. In addition, when the user sets the hot water mode, the operating mode of the boiler is controlled even when the three-way valve fails by comparing the user's set temperature and the measured temperature. In addition, the present invention provides a method of controlling a boiler in the event of a three-way valve failure to recognize a failure state of the boiler.

Features of the present invention for achieving the above object, the operation mode setting step of setting the required operating state for the user; In the case of the hot water mode, the control unit sends a signal to the set temperature storage step in the hot water mode, and measures the change of the hot water temperature according to the combustion time in the heating mode. ; A set temperature storing step of storing a temperature of hot water set for use by a user by a signal of an operation mode setting checking step; Hot water use detection step for detecting whether the flow of water in the flow sensor mounted on the water pipe; Delaying the flow of the circuit for a set time, and after the set time has elapsed setting time elapsed signal for measuring and storing the temperature of hot water; A temperature measurement and storage step of measuring and storing a temperature (T _S ) of hot water supplied using a temperature sensor mounted to the hot water pipe according to the signal sent out in the step; If the set temperature (T _P ) is greater than the measured temperature (T _S ) of a certain multiple (α) compared to the temperature (T _P ) of the hot water set by the user, a signal is sent to the error display step. If T _P ) is equal to the measured temperature T _S of the constant multiple α, comparing the set temperature and the measured temperature to send a signal in a normal operation step; An error display step of displaying an error on a display window of a room cone according to the signal of the comparing step; A normal operation step in which the boiler performs the hot water mode operation continuously by the signal of the comparing step; A temperature change measurement step per combustion time for measuring a combustion temperature change value ΔT ₁ according to a heating time t ₁ using a temperature sensor according to a signal of an operation mode determination step; Measuring temperature change per digestion time by measuring and storing a temperature change ΔT ₂ during a digestion time t ₂ using a temperature sensor according to the signal of the step; When the temperature change rate per combustion time is greater than the rate of change of temperature per extinguishing time (β) by the comparison of the measured values of the temperature change measurement step per combustion time and the temperature change measurement per fire time, a signal is sent to the hot water mode switching step, The temperature change rate per combustion time and the temperature change rate per extinguishing time for transmitting a signal to the normal operation stage; A hot water mode switching step of switching to a hot water mode regardless of an operation mode set by a user by the signal transmitted in the step, and transmitting a signal in an error display step; An error display step of displaying an error of the three-way valve on the display window of the room cone according to the signal of the hot water mode switching step; And a three-way valve failure control method comprising a normal operation step of continuously maintaining the boiler in a heating mode by a signal of a temperature change rate per combustion time and a temperature change rate per fire time.

1 is a partial cross-sectional view schematically showing the interior of a conventional gas boiler,

2 is a schematic circuit diagram of a gas boiler equipped with a temperature sensor in a hot water pipe for carrying out the method according to the present invention;

3 is a block diagram showing essential components for practicing the method of the present invention,

Figure 4 is a graph showing the temperature change with time in the combustion and digestion of the boiler,

5 is a flowchart illustrating a control method of the present invention.

* Explanation of symbols on the main parts of the drawings *

S1 ... Operation mode setting step S2 ... Operation mode setting step

S3 ... Storage step for setting temperature S4 ... Detection step for using hot water

S5 ... Setting time elapsed step S6 ... Temperature measuring and storage step

S7, S14 ... error display step S8 ... error display step

S9, S15 ... Normal operating stage

S10 ... Measuring temperature change per combustion time

S11 Step of measuring temperature change per hour of fire extinguishing

S12 ... Comparison of temperature change rate per combustion time with temperature change rate per fire time

S13 ... hot water mode switching stage

A ... control unit i ... driving unit

Da ... flow sensor detector d ... time detector

T ... temperature detector bar ... display

Referring to Figure 2 describes the schematic operation state, the boiler 100 operates in hot water mode or heating mode according to the user's setting, in the heating mode, the three-way valve 104 is switched to the heating mode, The gas valve 105 is ignited in a burner (not shown) in which the gas is mounted to the heating unit 102 through the opening gas pipe to raise the temperature of the heating water passing through the heat exchanger 101, which is heated in the A direction. As a result, the pump 107 is introduced into the heat exchanger 101, and circulates through the rooms in which the heating supply pipe is piped along the C direction, and is returned to the expansion tank 103 through the heating return pipe. And in the hot water mode, the three-way valve 104 is switched to the hot water mode, the flow of heating water is circulated in the boiler 100 by the pump 107 along the B direction, the water is a heat exchanger through a straight pipe After flowing into 101 and the temperature is raised, it is ejected through the hot water pipe.

In the case of failing to switch to the heating or hot water mode due to the inability or failure of the three-way valve 104 during this operation is controlled by the method described below with reference to FIG. In order to perform this method, the boiler 100 detects whether water flows through the control unit (a) shown in FIG. 3, the driving unit (b) for controlling the operation and stop of the boiler 100 in the hot water and heating mode, and the direct water pipe. A flow sensor detector (c), a time detector for delaying the flow of the circuit for a predetermined time during a certain operation by using a timer circuit (d), a temperature detector (e) for detecting a temperature of a predetermined portion, and a display for indicating an operating state (F) is essential.

The boiler 100 having such a configuration starts the initial driving, and sends a signal to the operation mode determination step (S2) from the operation mode setting step (S1) to set the required operating state, the user has set the heating mode In case of the hot water mode, it is determined whether the hot water mode is set, or when the hot water mode is set, a signal is sent to the set temperature storage step (S3). Send a signal.

First, a case in which the user sets the hot water mode will be described. In step (S3) of storing the temperature of the hot water set for use by the user according to the signal transmitted in the operation mode determination step (2), the set temperature of the hot water is stored. And, the flow sensor 109 mounted on the water pipe sends a signal to the hot water use detection step (S4) for detecting whether the flow of water occurs.

And when the use of hot water is detected in the hot water use detection step (S4) by the signal of the set temperature storage step (S3) and delays the flow of the circuit for a set time by the timer circuit in the set time lapse determination step (S5), After the elapse of time, the signal is sent to step S6 of measuring and storing the temperature of the warm water. The delay of the flow of the circuit for the set time in this way is that the temperature of the hot water passing through the heat exchanger 101 by the combustion of the gas introduced into the heating unit 102 due to the opening of the gas valve 105 is set by the user This is to measure the temperature after sufficiently rising up to one temperature T _P. In addition, as described below, this is also an important factor necessary to determine whether the operation state of the three-way valve 104 is good. In this case, the setting time is preferably about 1 minute.

In the step S6 of measuring and storing the temperature T _S of the hot water used according to the signal sent out in the step S5 after the set time has elapsed, it is supplied using the temperature sensor 110 mounted on the hot water pipe. Measure and store the temperature (T _S ) of the hot water to be compared to the temperature (T _P ) of the hot water set by the user sends a signal to the step (S7).

Temperature comparison step by the signal of the step (S6) (S7) the set temperature (T _P) and a predetermined measuring temperature (T _S) to a setting temperature (T _P) the measured temperature (T _S as compared to the drain (α) Greater than), this means that the three-way valve 104 is unable to switch to the hot water mode due to a malfunction or failure, and sends an signal to the error display step (S8) to display an error on the display of the room cone (not shown). , If the set temperature (T _P ) and the measured temperature (T _S ) of the constant drainage (α) is the same, the three-way valve 104 is in a normal operating state and sends a signal to the normal operation step (S9) Continue to operate the hot water mode. Constant drain (α) of the measured temperature (T _S) in consideration of the influence of the external environment in this case is preferably set to about 1.3 times (i.e., T _P ≥ 1.3T _S).

In the above case, the operation of the boiler 100 is not interrupted. In this case, the heat exchanger 101 may not be damaged, and the normal heating function may be performed. Because you can.

When it is determined that the user has selected the heating mode in the operation mode determination step S2, the signal is sent to the step S10 of measuring the combustion temperature change value ΔT ₁ according to the heating time t ₁ . In this step (S10) is installed in the heating water supply pipe connecting the three-way valve 104 and the heat exchanger 101 to prevent overheating during the time that the heat exchanger 101 is heated by the burner of the heating unit (102). Measure and store the rising temperature using the temperature sensor 108, and transmits the signal to the step (S11) to measure and store the temperature change (ΔT ₂ ) during the digestion time (t ₂ ) to fall in the manner described above Measure and store the temperature.

In the step S12 of comparing the temperature change rate per combustion time and the temperature change rate per digestion time through the steps S10 and S11, when the temperature change rate per combustion time is greater than the temperature change rate per digestion time of a predetermined multiple (β), the step of switching the hot water mode (S13). Signal is transmitted in step S), and if small, the signal is sent to the normal operation step (S15). In this case, the value of the set constant multiple (β) in the normal operating state is about 4 times (that is, ΔT ₁ / t ₁ ≥ 4ΔT ₂ / considering the comparative value of the temperature change rate per combustion time and the temperature change rate per fire time). t ₂ ) is preferred.

As described above, when the rate of change in temperature per combustion time is greater than the rate of change in temperature per digestion time of a constant multiple β, the results are as shown in the graph shown in FIG. 4. This graph indicates that the temperature measured by the temperature sensor 108 rises rapidly during the short burning time and slowly decreases during the digestion time because the 3-way valve 104 fails to switch to the heating mode and the heating water circulates in the B direction. The result detected by doing is shown. Accordingly, since the control unit recognizes the heating mode according to the user's setting, the flow sensor 109 maintains a repetitive combustion and extinguishing state even if there is no flow of water, thereby causing damage to the heat exchanger 101. Therefore, in this case, regardless of the operation mode set by the user by the signal sent to the hot water mode switching step (S13), switch to the hot water mode, and sends a signal to the error display step (S14) to display the three-way valve ( Error). However, when the signal is sent to the normal operation step (S15) in accordance with the determination of the comparison step (S12), since the three-way valve 104 is operating normally, it continues to operate in the heating mode.

As described above, according to the present invention, when the user is set to the heating mode by mounting the temperature sensor on the hot water pipe, it detects the temperature change with time in the combustion and extinguishing state of the boiler and uses the comparison value of the change rate. Is set to hot water mode to control the operation mode of the boiler even when the 3-way valve breaks down by comparing the user's set temperature and measured temperature. There is an effect that can be recognized.

Claims (4)

In the gas boiler 100 controlled by the three-way valve 104 in the heating mode and hot water mode, An operation mode setting step (S1) of setting an operation state required by a user; It is determined whether the setting state is the heating mode or the hot water mode, and in the hot water mode, a signal is sent to the set temperature storage step (S3), and in the heating mode, the signal is sent to the step (S10) of measuring a change in hot water temperature according to the combustion time. An operation mode setting checking step (S2); A set temperature storage step (S3) of storing the temperature of the hot water set for use by the user by the signal of the operation mode setting check step (2); Hot water use detection step (S4) for detecting whether the flow of water occurs in the flow sensor 109 mounted on the water pipe; Delaying the flow of the circuit for a set time, after the set time has elapsed setting time elapsed step (S5) for transmitting a signal to the step of measuring and storing the temperature of hot water (S6); A temperature measurement and storage step (S6) of measuring and storing a temperature (T _S ) of hot water supplied by using the temperature sensor (110) mounted on the hot water pipe according to the signal sent out in the step (S5); If the set temperature (T _P ) is larger than the measured temperature (T _S ) of the constant multiple (α) compared to the temperature (T _P ) of the hot water set by the user, a signal is sent to the error display step (S8). If the set temperature T _P is equal to the measured temperature T _S of the constant multiple α, comparing the set temperature and the measured temperature for sending a signal to the normal operation step S9 (S7); An error display step (S8) of displaying an error on a display window of a room cone (not shown) according to the signal of the comparison step (S7); Normal operation step (S9) to continue the operation of the boiler 100 in the hot water mode by the signal of the comparison step (S7); A temperature change measurement step (S10) for measuring a combustion temperature change value ΔT ₁ according to the heating time t ₁ using the temperature sensor 108 by the signal of the operation mode determination step S2; A temperature change per step of digestion (S11) for measuring and storing the temperature change (ΔT ₂ ) during the digestion time (t ₂ ) using the temperature sensor 108 according to the signal of the step (S10); By comparing the measured values of the steps (S10, S11) by sending a signal to the hot water mode switching step (S13), if the temperature change rate per combustion time is greater than the temperature change rate per digestion time of a constant multiple (β), if it is small normal operation Comparing the temperature change rate per combustion time with the temperature change rate per digestion time sending out a signal in step S15 (S12); Hot water mode switching step (S13) of switching to the hot water mode regardless of the operation mode set by the user by the signal sent in the step (S12), and sending a signal to the error display step (S14); An error display step (S14) of displaying an error of the three-way valve 104 on the display window of the room cone according to the signal of the hot water mode switching step (S13); And Boiler control method when the three-way valve failure consisting of a normal operation step (S15) to continue to maintain the boiler 100 in operation in the heating mode by the signal of the comparison step (S12). The method of claim 1, wherein the setting time of the setting time elapsed checking step (S5) is about 1 minute. The boiler control method according to claim 1, wherein a predetermined multiple (α) of the set temperature and the measured temperature comparison step (S7) is about 1.3 times. The method of claim 1, wherein a predetermined multiple (β) of the temperature change rate comparison step (S12) is about four times.