KR102522032B1 - Apparatus and Method for Fault Detect of Three-way Fixing of Boiler - Google Patents

Abstract

The present invention relates to an apparatus and a method for detecting a failure of a three-way valve of a boiler. The purpose of the present invention is to detect a failure of a three-way valve by analyzing the slope of an output water temperature (TH) rising to a target set temperature due to the difference in length between a heating flow path and a hot water flow path and the difference between a heating circulation flow rate and a hot water circulation flow rate. The apparatus for detecting a failure of a three-way valve of a boiler comprises an output water temperature sensor, a circulation pump, and a control unit.

Description

Apparatus and Method for Fault Detect of Three-way Fixing of Boiler}

The present invention relates to a method for detecting a three-way failure of a boiler by analyzing a temperature rise gradient until a tap temperature (TH) of a secondary heat exchanger reaches a target set temperature during a hot water preheating operation.

In general, a boiler is a device installed for supplying heating and hot water, using heat generated while burning various fuels to heat water, directly use the heated water, or to be used for heating homes or various buildings. Depending on their size, small boilers used for home use and large boilers used for industrial purposes are widely developed and used. In addition, depending on the fuel used, they are classified into oil boilers and gas boilers, and various types of boilers are developed and used. are losing

In such a boiler for both hot water and heating, a three-way valve equipped with one inlet and two outlets is installed to supply and circulate hot water or heating water heated by the heat exchanger to the hot water faucet side or heating pipe, so that the user's operation mode In response to the selection, the control unit automatically switches the three-way valve to the hot water side or the heating side.

In other words, although the main role of the three-way valve used in boilers is an important part that determines the circulation path for the heating circuit and the hot water circuit, in most conventional boilers, the three-way valve is accurately switched to the heating circuit side or the hot water circuit side. There was no function capable of detecting whether or not a switch was made.

Therefore, in most conventional boilers, combustion continues to proceed in the heating or hot water mode even if the three-way valve malfunctions due to sticking or failure, resulting in unnecessary gas consumption as well as economic loss. Unlike doctors, high-temperature hot water is supplied to the user, which poses safety risks such as burns. In particular, there are problems such as the occurrence of many unnecessary service requests because the user does not know exactly what kind of failure state there is.

In addition, in the prior art, there is no separate three-way valve failure detection means, so if an error indicating the overheating state of the appliance occurs, considering the site conditions such as whether the control system for each room is installed, the valve actuator for each room control, the boiler internal circulation pump, and the boiler three-way There was a problem in that the service had to be performed by inferring various possibilities such as valve failure.

Domestic Patent Publication No. 10-2014-0128592 (published on 2014.11.06.)

In order to improve the problems of the prior art, the present invention analyzes the rising slope of the tap temperature (TH) temperature to the target set temperature due to the difference in length between the heating passage and the hot water passage, and the difference between the heating circulation flow rate and the hot water circulation flow rate. An object of the present invention is to provide an apparatus and method for detecting a triangular valve failure of a boiler to detect valve failure.

In order to achieve the object of the present invention, a three-way failure detection device for a boiler is a three-way failure detection device for a boiler for detecting a failure of a three-way valve for switching a flow path of heat source water heated by a burner of a boiler to heating or hot water. In the method, a tapping temperature sensor for measuring the tap temperature (TH) of the three-way valve and the heat source water supply passage of the burner; a circulation pump for forcibly circulating and supplying the heat source water to each flow path including the primary heat exchanger, secondary heat exchanger, three-way valve, hot water, and heating water; and in a state where the circulation pump is driven and combustion is stopped in the hot water preheating mode of the boiler, the tapping temperature (TH) measured from the tapping temperature sensor is within the reference time (Tc) for triangular failure error determination of the tapping temperature (TH). If the deviation is not leveled, or if the deviation of the hot water temperature (TH) is leveled and exceeds the reaching time of the three-way failure diagnosis target temperature (Kd) during hot water combustion, the control unit determines that the three-way failure occurs. to be characterized

Here, the control unit has a three-way valve on the hot water side during hot water preheating, and when the temperature deviation of the tap temperature (TH) measured by driving the circulation pump in a state where combustion is stopped is not leveled within the set reference value (Kc) for a certain time, the three-way valve is on the hot water side. It is characterized in that it is judged as a valve failure error.

In addition, the control unit performs hot water preheating operation and three-way fault diagnosis at regular intervals when the boiler is in an idle state in which heating and hot water operation is not performed, or enters hot water preheating so that the tapping temperature (TH) of the hot water flow path is equalized. Thereafter, it is characterized in that a triangular fault diagnosis is performed through hot water preheating combustion.

In order to achieve the object of the present invention, a method for detecting a three-way valve failure of a boiler is a three-way valve failure detection method according to the temperature of the hot water source water measured by the three-way failure diagnosis unit during the preheating operation of the boiler and the calculated change value. In the three-way failure detection method of a boiler for diagnosing, when the three-way valve is a hot water side flow path, the circulation pump is driven before preheating and combustion of the boiler so that the tapping temperature (TH) of the secondary heat exchanger is leveled for a certain time (Tc) If not, the first process of determining that it is a triangular failure; After the boiler starts hot water preheating combustion, hot water burns until the tapping temperature (TH) reaches the target temperature (Ka) set to reach the hot water set temperature set by the user or the set maximum hot water preheating operation time (Ta) elapses. A second process of performing; and a third step of judging a three-way failure error when the tapping temperature (TH) exceeds the reaching time of the three-way failure diagnosis target temperature (Kd) during the second step.

Here, in addition to the second process, the hot water preheating and combustion are stopped when the tapping temperature (TH) reaches the target temperature (Ka), and then the hot water preheating is terminated when the set maximum hot water preheating operation time (Ta) elapses. The step of repeating the second process by performing re-burning when the hot water preheating temperature (TH) is lowered to less than the re-burning set temperature (Kb) within the maximum operation time (Ta) of warm water preheating.

An apparatus and method for detecting a three-way hot water side failure of a boiler according to the present invention level the temperature deviation of the hot water temperature (TH) in hot water preheating mode or diagnose the three-way failure of the tapping temperature (TH) according to the rate of rise to the target temperature. Failure errors can be determined, and in the case of an overheating error in the boiler, three-way valve failure or sticking can be clearly diagnosed. By inferring various possibilities, there is an effect of preventing confusion in post-service and omitting unnecessary preparation processes.

1 is a schematic configuration diagram of a boiler for implementing the present invention;
2 is a block diagram of a triangular failure detection device of a boiler for implementing the present invention;
3 is a flowchart of a triangular failure detection process of a boiler according to an embodiment of the present invention;
FIG. 4 is a graph for determining whether or not a triangular valve has failed with respect to the tapping temperature (TH) after temperature leveling in FIG. 3 and the time required to reach the triangular failure diagnosis target temperature.

The features and effects of the present invention described above will become more apparent through the following detailed description in relation to the accompanying drawings, and accordingly, those skilled in the art to which the present invention belongs can easily implement the technical idea of the present invention. You will be able to.

Since the present invention can have various changes and various forms, specific embodiments are exemplified and described in detail in the text.

However, this is not intended to limit the present invention to the specific disclosed form, and it should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention.

Terms used in this application are only used to describe specific embodiments, and are not intended to limit the present invention.

A method for detecting a triangular failure of a boiler according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 and 2, a primary heat exchanger 102 heats the heat source water by receiving a heat source from a burner of a boiler, and the heat source water from the primary heat exchanger 102 is switched to hot water or a heating passage. The three-way valve 104 that receives heat source water from the boiler and exchanges heat with direct water to heat it to hot water, and the three-way valve 104 and the tapping temperature of the heat source water supply passage of the burner (TH) ) and the hot water temperature sensor 103 for measuring the heat source water, the primary heat exchanger 102, secondary heat exchanger 108, secondary heat exchanger 102, three-way valve 104, hot water, heating A circulation pump 101 for forcibly circulating and supplying water to each flow path, driving the circulation pump 101, controlling the combustion drive of the burner according to the set temperature, switching the flow path of the three-way valve 104, According to the result of calculating the change in the tapping temperature (TH) measured through the tapping temperature sensor 103, the control unit 110 determines whether the three-way valve 104 is out of order, and the hot water temperature for setting the hot water temperature It consists of a setting unit 106, a hot water preheating input unit 105 generating a hot water preheating operation signal of the boiler, and an error warning unit 107 alarming when the three-way valve 104 is determined to be out of order.

Here, the control unit 110 includes a combustion control unit 111 for driving and controlling combustion of the burner according to input values of the hot water temperature sensor 103, the hot water preheating input unit 105, and the hot water temperature setting unit 106; The three-way valve failure diagnosis unit 112 for diagnosing a failure of the three-way valve 104 by analyzing each data input from the hot water temperature sensor 103, the hot water preheating input unit 105, and the hot water temperature setting unit 106 And, a load driving control unit 113 for driving and controlling the circulation pump 101, the three-way valve 104, the solenoid valve, the combustion fan, etc. according to the control signals of the combustion control unit 111 and the three-way valve failure diagnosis unit 112 consists of

In addition, the three-way valve fault diagnosis unit 112 receives a hot water preheating signal from the hot water preheating input unit 105, stops using hot water, or when the boiler is in an idle state in which neither heating nor hot water operation is performed for a predetermined time. It performs hot water preheating operation and triangular fault diagnosis on a regular basis.

The operation process of the triangular failure detection device of the boiler according to the embodiment of the present invention configured as described above will be described in detail with reference to FIGS. 1 to 4 attached.

Referring to FIG. 3 , when a hot water preheating input signal from the hot water preheating input unit 105 is input to the control unit 110 , hot water preheating starts.

When the hot water preheating of the boiler starts, the combustion control unit 111 receives a hot water preheating signal from the hot water preheating input unit 105, and stops burning the three-way valve 104 through the load driving control unit 113 and hot water. side flow path, and the circulation pump 101 starts counting the hot water preheating time (T) at the same time as it is driven. (S11) (S13)

That is, after entering the hot water preheating operation and before permitting hot water combustion, the temperature of the secondary heat exchanger 102 on the hot water flow path side is generally equalized and the circulation pump is operated for a certain period of time (Tb) to detect an accurate temperature. (S13 )

At this time, the atrial valve failure diagnosis unit 112 calculates the temperature deviation of the tapping temperature TH measured through the tapping temperature sensor 103, and continuously for a predetermined time Tb for which the temperature deviation is set within the reference range ( If Kc) is maintained, it is determined that it is leveled, and hot water preheating combustion is started. (S15) (S19)

Here, the temperature deviation leveling is to maintain the maximum deviation of the tap temperature (TH) measured for a certain time (Tb) after entering the hot water preheating function within a set reference range (Kc).

If the temperature deviation of the tapping temperature (TH) is not equalized to the standard range (Kc) within the set triangular fault error determination time (about 30 seconds to 300 seconds), it is determined as a triangular fault error, and the error alarm unit ( 107) to alert the user. (S16) (S17)

After starting the hot water preheating combustion (S19), when the tapping temperature (TH) measured from the tapping temperature sensor 103 reaches the target temperature (Ka) set to reach the hot water set temperature (Ku) set by the user ( S21) The combustion is stopped, and the circulation pump 101 maintains the driving state. (S23)

Here, the target temperature (Ka) is a function to heat the secondary heat exchanger and the hot water circulation pipe so that water corresponding to the hot water set temperature (Ku) is tapped in the case of hot water preheating combustion. In order to reach the hot water set temperature set by the user, set it higher (about 20 degrees) than the user set hot water set temperature (Ku) to control the amount of heat so that the tapping temperature (TH) rises, and if the tapping temperature (TH) rises more than that to digest

At this time, the target temperature (Ka) of the hot water preheating temperature is a function for preheating in a state in which direct water does not flow to the secondary heat exchanger 108, and must be set higher than the hot water set temperature (Ku) by the user for subsequent secondary heat exchange. When direct water flows through the machine 108, it is heated by a predetermined temperature to reach the set temperature Ku, so it can be set higher than the set temperature Ku of hot water.

When the target temperature (Ka) at which the tap temperature (TH) is set is maintained for the maximum operation time (Ta) of hot water preheating, the hot water preheating is finished. (S27) (S29)

Here, the hot water preheating maximum operation time (Ta) is a time counted from the time of starting the hot water combustion in the 'step S19', and is preferably set to about 120 seconds to 600 seconds.

If, after the combustion is stopped (S23), the tapping temperature (TH) is lowered to the lower limit set temperature (Kb) for re-burning, the return to the re-burning (S19) step is performed at the hot water set temperature (Ku) set by the user. The temperature of the secondary heat exchanger 102 is maintained accordingly. (S23) (S25)

After starting the hot water combustion (S19), the hot water temperature measured by the hot water temperature sensor 103 (TH) does not reach the target temperature (Ka) set to reach the hot water set temperature (Ku) set by the user. When the maximum operation time (Ta) of hot water preheating set to elapses, the hot water preheating is terminated. (S21) (S31)

During the maximum hot water preheating operation time (Ta), the temperature rise gradient until the tapping temperature (TH) reaches the target temperature (Ka) set lower than the set target temperature (Kd) for triangular fault diagnosis is detected, and the triangular valve fault is detected. will judge

That is, the rising slope of the tapping temperature TH due to the difference in length between the heating passage and the hot water passage and the difference between the heating circulation flow rate and the hot water circulation flow rate is used, and the tapping temperature TH reaches the target temperature Ka. Assuming that the time to burn with the same amount of heat, there is a difference in that the temperature rises faster between heating the circulating water in the heating passage and heating the circulating water in the hot water passage, which has a relatively small flow rate. , is to use this to detect triangular faults.

Referring to FIG. 4, in more detail, the hot water preheating and combustion (S19) after the temperature leveling (S15) continuously increases the tapping temperature (TH), and after the hot water preheating and combustion, the tapping temperature (TH) is The temperature rise rate up to the triangular fault diagnosis target temperature (Kd) is calculated as the temperature rise slope. (S35)

Here, the three-way fault diagnosis target temperature (Kd) is set lower than the target temperature (Ka) corresponding to the hot water set temperature (Kd) set by the user, as in an embodiment shown in Table 1 below, Set the temperature higher than the temperature (Kb) and hot water set temperature (Kd).

Hot water setting temperature (Ku)℃ Target temperature (Ka) ℃ Triangular fault diagnosis target temperature [Kd]℃ 35℃ 55℃ 40℃ 36℃ 56℃ 42℃ 37℃ 57℃ 44℃ … … … 55℃ 75℃ 67℃ … … … 60℃ 80℃ 70℃

Here, the following Table 1 is only an example and can be changed according to experimental operation or heating/hot water usage environment.

After the temperature leveling, it is determined whether or not the triangular valve has failed according to the temperature rise gradient of the tapping temperature (TH) detected after the temperature leveling. As shown in FIG. If the time of is calculated as the temperature rise slope passing the triangular fault diagnosis reference time Tk, it is determined as a triangular fault.

Table 2 below is an example for explaining the correlation between the temperature difference between the three-way fault diagnosis target temperature (Kd) and the tapping temperature (TH) and the three-way fault diagnosis target temperature (Kd).

Triangular fault diagnosis target temperature [Kd]℃ - temperature of tapping temperature TH℃ Tk … … 5℃ 10 seconds 10℃ 15 seconds 15℃ 20 seconds … … 30℃ 40 seconds 35℃ 50 seconds … …

Referring to Tables 1 and 2, when the hot water set temperature (Ku) is 55 ° C, the triangular fault diagnosis target temperature (Kd) in Table 1 is 67 ° C, and after the tap temperature (TH) is leveled If it is 37 ℃, the difference value becomes 30 ℃ (67 ℃ - 37 ℃), and as shown in Table 2, if the difference value is 30 ℃, the triangular failure diagnosis reference time (Tk) is 40 seconds, and the temperature rise slope (A) is calculated

Based on the temperature rise slope (A), the triangular fault diagnosis target temperature (Kd) is reached. If the triangular fault diagnosis reference time (Tk) is shorter than the triangular fault diagnosis reference time (Tk), the triangular fault is normal. judged by

That is, after the temperature of the secondary heat exchanger is leveled, the time (Td) until the temperature of the tapping temperature (TH) reaches the three-way fault diagnosis target temperature (Kd) after hot water preheating and combustion according to the hot water preheating operation is described above. If the triangular fault diagnosis standard time (Tk) elapses, it is determined as a triangular fault error. (S35) (S37) (S41)

On the other hand, when the tapping temperature TH reaches the triangular fault diagnosis target temperature Kd and it is not the triangular fault error, it is determined that there is a triangular fault check experience, and the tap temperature TH and the target temperature It returns to the step (S21) of comparing the temperature (Ka). (S39)

Here, the three-way failure check experience is difficult to check accurately because the tapping temperature (TH) is higher than the three-way failure diagnosis target temperature (Kd) when the three-way failure check is re-executed later. Do not re-execute (S33)

After the temperature of the secondary heat exchanger is equalized, if the tapping temperature (TH) is equal to or higher than the target temperature (Ka), the secondary heat exchanger temperature is in a high temperature state, so it is immediately extinguished without separate preheating and combustion.

Therefore, it is possible to check the triangular fault through hot water preheating combustion, and a separate combustion process for triangular fault checking is unnecessary.

As described above, although the triangular failure detection device and method of the boiler according to the embodiment of the present invention have been described with limited embodiments and drawings, they are not limited by these embodiments, and are common knowledge in the art to which the present invention belongs. Of course, various modifications and variations are possible within the technical spirit of the present invention and the equivalent scope of the claims to be described below by those who have.

101: circulation pump 102: primary heat exchanger
103: tapping temperature sensor 104: three-way valve
105: hot water preheat input unit 106: hot water temperature setting unit
107: error alarm unit 108: secondary heat exchanger
110: control unit 111: combustion control unit
112: triangular fault diagnosis unit 113: load driving control unit

Claims (9)

In the boiler's three-way failure detection device for detecting the failure of the three-way valve for switching the heat source water heated by the burner of the boiler to heating or hot water,
a tap temperature sensor for measuring tap temperature (TH) of the three-way valve and the heat source water supply passage of the burner;
a circulation pump for forcibly circulating and supplying the heat source water to each flow path including the primary heat exchanger, secondary heat exchanger, three-way valve, hot water, and heating water; and
When the boiler is in the hot water preheating mode and the circulation pump is driven and combustion is stopped, the tap temperature (TH) measured from the tap temperature sensor is a deviation of the tap temperature (TH) within the reference time (Tc) for triangular failure error determination. When is not leveled or when the deviation of the hot water temperature (TH) is leveled and exceeds the reaching time of the three-way failure diagnosis target temperature (Kd) during hot water combustion, the control unit determines that the three-way failure occurs. Boiler's triangular failure detection device. According to claim 1,
The control unit has three-way valves on the hot water side during hot water preheating, and when the temperature deviation of the tap temperature (TH) measured by driving the circulation pump in a state where combustion is stopped is not leveled within the set reference value (Kc) for a certain period of time, the three-way valves fail. Boiler's triangular failure detection device, characterized in that it is determined as an error. According to claim 1,
The control unit performs hot water preheating operation and three-way fault diagnosis at regular intervals when the boiler is in an idle state in which heating and hot water operation is not performed, or
A three-way failure detection device for a boiler, characterized in that it performs a three-way failure diagnosis through hot water preheating combustion after the tap temperature (TH) of the hot water flow is leveled after entering the hot water preheating. According to claim 1,
When the actual elapsed time until the temperature of the tap water temperature (TH) reaches the three-way fault diagnosis target temperature during the hot water preheating operation passes the three-way fault determination reference time (Tk) set based on the temperature rise slope, the controller Judging by the triangular failure error,
The triangular failure detection reference time (Tk) is a three-way failure detection device for a boiler, characterized in that set by the temperature difference between the temperature of the tapping temperature (TH) detected after temperature leveling and the temperature difference between the three-way failure diagnosis target temperature (Kd) . In the boiler's three-way failure detection method for diagnosing the failure of the three-way valve according to the measurement of the tap temperature of the heat source water and the calculated change value by the three-way valve failure diagnosis unit during preheating operation of the boiler,
When the three-way valve is a hot water side flow path, a circulation pump is driven before preheating and combustion of the boiler, and if the tapping temperature (TH) of the secondary heat exchanger is not leveled for a certain period of time (Tc), a three-way valve failure is judged as a first process;
After the boiler starts hot water preheating combustion, when the tapping temperature (TH) reaches the target temperature (Ka) set to reach the hot water set temperature (Ku) set by the user or the set hot water preheating maximum operation time (Ta) elapses A second process of terminating hot water combustion; and
A third process of determining a three-way failure error when the tapping temperature (TH) exceeds the reaching time of the three-way failure diagnosis target temperature (Kd) during the second process; Stool failure detection method. According to claim 5,
In addition to the second process, hot water preheating is stopped when the tapping temperature (TH) reaches the target temperature (Ka), and hot water preheating is terminated when the set maximum hot water preheating operation time (Ta) elapses,
and repeating the second process by performing re-burning when the hot water preheating maximum operation time (Ta) lowers the tap temperature (TH) to less than the lower limit set temperature (Kb) for re-burning. A method for detecting a triangular failure of a boiler. According to claim 5,
The third process returns to the second process when there is no experience of the three-way failure check until the tapping temperature (TH) reaches the three-way failure diagnosis target temperature (Kd). detection method. According to claim 7,
In the three-way failure check experience, if the tapping temperature (TH) reaches the three-way failure diagnosis target temperature (Kd), but the three-way failure determination time (Tk) has not elapsed, it is determined that the three-way failure is not a failure, and the A method for detecting a triangular failure of a boiler, characterized in that it is performed by returning to the second process. According to claim 5,
In the third process, when the time Td until the tapping temperature TH reaches the three-way failure diagnosis target temperature Kd passes the three-way failure determination time Tk, it is judged as a three-way failure error. A method for detecting a triangular failure of a boiler, characterized in that it comprises a; step.

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