JP4019536B2 - Oil combustion equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an oil combustion apparatus that can be used, for example, as a combustion section of an oil water heater.
[0002]
[Prior art]
Conventionally, in an oil combustion apparatus used as a combustion section of an oil water heater or the like, the fuel is generally supplied from the oil tank to the burner section through an oil supply path using the oil tank as a fuel storage source. It was supposed to be.
[0003]
[Problems to be solved by the invention]
However, when water is stored in the oil tank due to condensation or the like during the oil supply described above, the water may reach the actuator or burner section for supplying fuel through the oil supply path. When this happens, it goes without saying that if it is burning, the fire goes out, and if ignition is in progress, ignition will fail. In addition, the mixed moisture causes rust to occur on the members of the apparatus, which may cause malfunction and decrease in durability of the apparatus.
[0004]
Therefore, the present invention solves the above-described problems in the conventional oil combustion apparatus, and when there is a fluid other than oil such as water in the oil tank or the oil supply path, this can be detected quickly, and therefore It is possible to deal with it promptly, prevent the mixed water etc. from being supplied to the burner section, etc., and repair and restore it to a normal state before serious failure or major repair. It is an object to provide an oil combustion device that can be used.
[0005]
[Means for Solving the Problems]
To achieve the above object, oil combustion apparatus of the present invention is an oil combustion apparatus which is supplied to the burner unit, and to perform combustion through the oil supply path by pump oil from oil tank, the oil Provided in the supply path is an indirectly heated flow rate detector having a heat generating element, a flow rate detecting element, and a temperature compensating element. In addition to detecting the oil flow rate by the indirectly heated flow rate detector, the detected fluid is oil. It is the first feature that it is configured to determine whether or not .
In addition to the first feature, the oil combustion apparatus according to the present invention determines whether or not the fluid to be detected is petroleum by determining whether or not the fluid to be detected is a detected output base value for the fluid to be detected that is stationary by the indirectly heated flow rate detector. the obtained, the detection output base value is a second feature to be based on different depending on the type of the detected fluid.
In addition to the first or second feature, the oil combustion apparatus of the present invention detects the type of fluid to be detected by the indirectly heated flow rate detector prior to driving the pump when performing the combustion operation start operation. If the detected fluid is the oil, the combustion operation is continued. If the detected fluid is not petroleum, the combustion operation start operation is stopped by the safety operation.
[0006]
According to the first feature, the oil supply passage is provided with an indirectly heated flow rate detector having a heating element, a flow rate detecting element, and a temperature compensating element, and the oil flow rate is detected by the indirectly heated flow rate detector. In addition, since it is also configured to determine whether or not the fluid to be detected is oil, it is possible in advance that an undesirable fluid other than oil may be supplied to an important mechanism such as a burner. I can know. Therefore, before performing the combustion operation, it is possible to remove in advance a mixed fluid such as water other than petroleum. As a result, it is possible to prevent an undesirable situation from occurring in the combustion operation.
Further, the indirectly heated flow rate detector having the heat generating element, the flow rate detecting element, and the temperature compensating element can detect the flow rate of the oil flowing through the oil supply path in addition to the fluid discrimination of the detected fluid.
In addition, the heat generating element, the flow detecting element, the temperature compensating element, etc. constituting the indirectly heated flow detector can generally have a sufficiently small size, and the degree of freedom of their shape is large, so that the inner diameter is small. It can be preferably applied also in the oil supply path.
Further, according to the second feature, in addition to the operation of the first feature, whether or not the fluid to be detected is petroleum is determined by the indirectly heated flow rate detector with respect to the fluid to be detected that is stationary. A detection output base value is obtained, and the detection output base value is determined based on the fact that the detection output base value varies depending on the type of the fluid to be detected.
When discriminating the type of fluid to be detected by the indirectly heated flow detector, the fluid has specific heat specific to each fluid, so the flow rate detection element in contact with the fluid has different ways of depriving heat depending on the type of fluid. To do. For this reason, when the detection output value related to the flow velocity in the static state is obtained as the detection output base value under the same condition of the static state, the detection output base value varies depending on the type of fluid. Therefore, by comparing the detection output value in the stationary state with the detection output base value for each fluid type obtained in advance, the type of fluid such as whether the detected fluid is oil or water is determined. Can be determined. In addition, air can also be included in the fluid. The output base value is an output value that is detected when a stationary fluid is measured by an indirectly heated flow rate detector that has a purpose of detecting the flow rate of the fluid that is actually flowing.
Further, according to the third feature, in addition to the operation of the first or second feature, in the case of performing a combustion operation, the oil is sent before being supplied to the burner portion by the pump drive. The type of fluid to be detected is detected, and when the fluid is not petroleum, the combustion start operation is automatically stopped. This avoids the supply of anything other than oil, such as water, to the burner section and other important mechanism sections, thus automatically causing a failure or serious disruption to the combustion function. Avoided.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is an overall schematic configuration diagram of an oil water heater having an oil combustion apparatus as an example of an embodiment of the present invention, FIG. 2 is a circuit diagram of an indirectly heated flow rate detector, and FIG. 3 is an indirectly heated flow rate. FIG. 4 is a flowchart illustrating an example of control in an oil water heater, illustrating the detection of the type of fluid by the detector.
[0008]
First, referring to FIG. 1, an oil water heater in which the oil combustion apparatus of the present invention is used will be described. The apparatus controls the fuel supply such as the oil tank 10, the oil supply path 20 from the oil tank 10, the indirectly heated flow rate detector 30 provided in the middle, and the fuel supply such as an electromagnetic pump and a fuel shielding valve. A supply actuator unit 40, a blower 50, a burner unit 60, a combustion chamber 70 provided with a heat exchanger for hot water supply therein, an exhaust unit 80 including a silencer, a controller 90 for controlling the entire apparatus, It consists of a remote control 100 or the like.
The oil tank 10, the oil supply path 20, the indirectly heated flow rate detector 30, the fuel supply actuator section 40, the blower 50, the burner section 60, the controller 90, the remote controller 100, etc. constitute an oil combustion apparatus.
When a hot water supply operation is commanded in the oil water heater, an on-off valve (not shown) is opened and closed in the fuel supply actuator unit 40, and the pump is driven. As a result, oil from the oil tank 10 passes through the oil supply path 20 on the way. It is supplied to the burner unit 60 through the flow rate detector 30 and used for combustion. In the combustion chamber 70, the water for hot water supply is heat-exchanged by the generated heat to become hot water, which is supplied to the hot water supply.
[0009]
The indirectly heated flow rate detector 30 also has the function of a fluid discriminator, and discriminates the type of fluid flowing through the oil supply path 20 as the fluid to be detected. Of course, the fluid discriminator for discriminating the type of fluid does not necessarily need to be the indirectly heated flow rate detector 30, and may be any device that can discriminate the type of fluid to be detected. This fluid discriminator is usually provided in the oil supply path 20, but may be provided in the inner bottom portion of the oil tank 10. As shown in FIG. 1, when water enters or enters the oil tank 10, the water accumulates at the bottom of the oil tank 10, so the fluid discriminator is preferably provided at the inner bottom of the oil tank 10.
If the detected fluid type is not the oil used in the oil combustion apparatus, the controller 90 displays the fact on the remote controller 100 and performs control for dealing with it.
[0010]
The original function of the indirectly heated flow rate detector 30 is to detect the flow rate of oil flowing through the oil supply passage 20, and by detecting the flow rate of oil flowing through the oil supply passage 20, more accurate combustion control is performed. It is used to do. Therefore, in the present embodiment, the indirectly heated flow rate detector 30 has an original flow rate detection function and a fluid discrimination function.
[0011]
The configuration of the indirectly heated flow rate detector 30 will be described with reference to FIG. The indirectly heated flow rate detector 30 is provided with a flow rate detection element 31, a heating element 32, and a temperature compensation element 33 as detection elements. The flow rate detection element 31 is in a heat receiving state by the heating element 32. The flow rate detecting element 31 and the temperature compensating element 33 are arranged so as to come into contact with oil (a fluid to be detected) flowing through the oil hot water supply path 20.
Factors that cause the resistance value of the flow rate detecting element 31 to change include the oil flow and the ambient temperature. The flow rate detection element 31 and the temperature compensation element 33 have the same temperature-resistance change rate. The operating voltage generated by the bridge composed of the flow rate detection element 31, the temperature compensation element 33, and the resistors R1 and R2 is the ambient temperature if the flow rate detection element 31 and the temperature compensation element 33 have the same temperature-resistance change rate characteristics. The output value is not affected by.
[0012]
For example, when the flow rate of oil increases from a state where the flow rate of oil flowing through the oil supply path 20 is constant and stable, and the flow rate increases, the flow rate detection element 31 in contact with the flowing oil is deprived of heat. As the temperature decreases, the + terminal of the calculation unit 34 becomes higher than the − terminal, and the output voltage of the calculation unit 34 decreases. As a result, the base current of the transistor Q1 of the applied voltage generator 35 increases, the current flowing through the heating element 32 increases, the amount of heat generated by the heating element 32 increases, and the temperature of the flow rate detection element 31 returns. As a result, the output voltage V across the heating element 32 increases.
Further, when the flow rate decreases and the flow rate decreases from a state where the flow rate of oil is constant and stable, the flow element 31 is deprived of heat and the temperature rises, so that the − terminal of the calculation unit 34 is higher than the + terminal. Thus, the output voltage of the calculation unit 34 increases. As a result, the base current of the transistor Q1 of the applied voltage generator 35 decreases, the current flowing through the heating element 32 decreases, the amount of heat generated by the heating element 32 decreases, and the temperature of the flow rate detection element 31 returns. As a result, the output voltage V across the heating element 32 decreases.
As described above, when the temperature of the flow rate detection element 31 is kept constant, the output voltage V of the heating element 32 increases in correlation with an increase in the oil flow rate, and the output of the heating element 32 decreases when the flow rate decreases. The voltage V decreases. Therefore, if the relationship between the oil flow rate and the output voltage V is obtained in advance and stored in the controller 90, the oil flow rate can be obtained by measuring the output voltage V of the heating element 32 in actual operation. Can do.
[0013]
Next, the type discrimination function of the fluid to be detected which the indirectly heated flow rate detector 30 has will be described with reference to FIG.
FIG. 3 is a flow rate-output voltage characteristic diagram showing the relationship between the flow rate and the detection output (output voltage V) for petroleum (kerosene) and water by the indirectly heated flow rate detector 30. The specific heat of petroleum (kerosene) is about 0.8. Therefore, as shown in FIG. 3, the data line of the flow rate-detection output (output voltage V) of water is the data line of the flow rate-detection output (output voltage V) of oil. It is about 1.2 times that of. That is, the flow rate-detection output (output voltage V) characteristic detected by the indirectly heated flow rate detector 30 is different depending on the type of the fluid to be detected. Therefore, the type of the fluid to be detected can be determined based on the difference between the flow rate-detection output (output voltage) characteristics. However, in the state where the fluid to be detected is flowing, the type of the fluid cannot be determined even if the detection output (output voltage V) is obtained. The type of the fluid to be detected is determined in advance by detecting the output (output voltage V) when the flow velocity is zero (stationary state) for each fluid to be detected, that is, the detection output base value (for example, as shown in FIG. The oil output voltage is A and the water output voltage is B), which is stored in the controller 90. When it is actually necessary to determine the type of the fluid to be detected, a detection output base value (output voltage base value) in a stationary state of the fluid to be detected is obtained and stored in the controller 90 in advance. By comparing with the data, it is determined whether the detected fluid is oil, water, or other types.
[0014]
With reference to FIG. 4, the example of control by the controller 90 at the time of performing the combustion driving | operation in the case of the oil water heater using the oil combustion apparatus of this invention is demonstrated.
Now, in an oil water heater, a hot water supply curan (not shown) is opened, water flows in the hot water supply passage, and when the water amount sensor detects the amount of water exceeding the minimum operating water amount, the combustion operation switch in the controller 90 is turned on and the combustion operation is started. Operation starts. For example, the operation starts when the blower 50 is first turned on (step S1). Next, before the fuel shielding valve of the fuel supply actuator 40 is opened and the electromagnetic pump is turned on, the controller 90 causes the indirectly heated flow rate detector 30 to detect the detected fluid that is still in the oil supply path 20. The type is determined for (step S2). If the detected fluid is oil by this type determination, the process proceeds to step S3 to determine whether or not the air flow rate of the blower 50 has become the air flow rate for ignition. If yes, the igniter of the burner unit 60 is Turned on (step S4). Subsequently, the fuel shielding valve of the fuel supply actuator unit 40 is opened, the electromagnetic pump is turned on, and the oil supply is started (step S5). Further, when a flame detector (not shown) detects a flame (Yes in Step S6), the operation shifts to a normal operation control (Step S7).
[0015]
On the other hand, if the detected fluid is not petroleum in step S2 (No in step S2), the controller 90 stops the combustion operation start operation by the safety operation (step S8). As a case where the fluid to be detected is not petroleum, water is mainly used, but it is possible to detect a case where another wrong type of liquid is put. It is also possible to determine when the oil tank 10 and the oil supply path 20 are emptied due to running out of fuel and air is contained.
The controller 90 may display on the display unit or the like of the remote controller 100 that the operation is stopped due to fuel failure when the detected fluid is not petroleum.
If no flame is detected in step S6, the ignition operation is repeated three times, and if the ignition is not repeated even after three repetitions (step S9), the operation is stopped by a safety operation (step S8).
[0016]
【The invention's effect】
The present invention has the above-described configuration and action, and according to the oil combustion apparatus according to claim 1, the oil from the oil tank is supplied to the burner portion via the oil supply path by a pump and burned. An oil combustion apparatus, wherein the oil supply passage is provided with an indirectly heated flow rate detector having a heating element, a flow rate detecting element, and a temperature compensating element, and the oil flow rate is detected by the indirectly heated flow rate detector. In addition, since it is configured to determine whether the detected fluid is oil,
If there is a fluid other than oil such as water in the oil supply path, this can be detected. Therefore, undesired fluids other than petroleum can be quickly removed from the system, thereby preventing water and the like from being supplied to an important mechanism such as a burner, or an unfavorable situation in combustion operation. It can be prevented and reduced. That is, it is possible to quickly cope with water contamination and the like, and it is possible to perform a minor repair work without causing a serious failure or a major repair.
Further, the indirectly heated flow rate detector having the heat generating element, the flow rate detecting element, and the temperature compensating element can detect the flow rate of the oil flowing through the oil supply path in addition to the fluid discrimination of the detected fluid.
In addition, the heat generating element, the flow detecting element, the temperature compensating element, etc. constituting the indirectly heated flow detector can generally have a sufficiently small size, and the degree of freedom of their shape is large, so that the inner diameter is small. It can be preferably applied also in the oil supply path.
Further, according to the oil combustion apparatus of the second aspect, in addition to the effect of the configuration of the first aspect, the determination as to whether or not the fluid to be detected is oil is stopped by the indirectly heated flow rate detector. to obtain a detected output base value with respect to the detection fluid in the state, the detection output basal value was be based on different depending on the type of the detected fluid,
The detection of the type of fluid by the indirectly heated flow detector is performed when the fluid is in a stationary state, so it is possible to know unfavorable situations such as contamination before starting the combustion operation, and poor combustion It is possible to avoid accidents such as these in advance.
Moreover, according to the oil combustion apparatus of Claim 3, in addition to the effect by the structure of the said Claim 1 or 2, when performing combustion operation start operation | movement, a side-heat type flow volume detection is performed prior to the drive of a pump. detects the type of the detected fluid by vessels, that the detected fluid continues to burn operation operation if the oil, if the detected fluid is not oil, a configuration for stopping the combustion operation start operation by the safety operation So
Before undesired fluids other than oil are sent to the burner, etc., the combustion operation start operation can be automatically stopped, and therefore, other than oil such as water in the burner and other important mechanisms It is possible to prevent the occurrence of a failure and a decrease in durability due to the supply of the fuel, and it is possible to automatically avoid a serious trouble in the combustion function.
[Brief description of the drawings]
FIG. 1 is an overall schematic configuration diagram of an oil water heater that includes an oil combustion apparatus as an example of an embodiment of the present invention.
FIG. 2 is a circuit diagram of an indirectly heated flow rate detector.
FIG. 3 is a diagram illustrating fluid type detection by an indirectly heated flow rate detector.
FIG. 4 is a flowchart showing an example of control in an oil water heater.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Oil tank 20 Oil supply path 30 Side heat type flow detector 31 Flow detection element 32 Heat generating element 33 Temperature compensation element 34 Calculation part 35 Applied voltage generation part 40 Fuel supply actuator part 50 Blower 60 Burner part 70 Combustion chamber 80 Exhaust part 90 Controller 100 Remote control

Claims (3)

An oil combustion apparatus configured to supply oil from an oil tank to a burner unit through an oil supply path using a pump and to burn the oil tank, wherein the oil supply path includes a heating element, a flow rate detection element, a temperature compensation element, In addition to detecting the flow rate of petroleum by the indirectly heated flow rate detector, the configuration is also configured to determine whether the detected fluid is petroleum or not. Oil burning equipment. Whether or not the detected fluid is oil is determined by obtaining a detection output base value for the detected fluid in a stationary state by the indirectly heated flow rate detector, and the detection output base value varies depending on the type of the detected fluid. The oil combustion apparatus according to claim 1, which is performed based on the above. When starting the combustion operation, the type of fluid to be detected by the indirectly heated flow detector is detected prior to driving the pump, and if the fluid to be detected is the relevant oil, the combustion operation is continued and detected. The oil combustion apparatus according to claim 1 or 2, wherein when the fluid is not petroleum, the combustion operation start operation is stopped by a safety operation.

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