JPH1194619A - Fluid flow rate detecting device and combustion device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To correct a detected value even if a device has been used for a long period, without requiring mechanical operating parts that could malfunction. SOLUTION: This detecting device 100 is placed in a fluid passage guiding a fluid. The detecting device 100 is provided with a flow rate sensor 111 placed within the fluid passage and making contact with a fluid flowing in the fluid passage and a temperature-compensating sensor 112 placed within the fluid passage in such a way as to make contact with the fluid in order to perform temperature correction as to the output of the flow rate sensor 111 when the flow rate sensor 111 measures the flow rate of the fluid. Further, an output value correction means 73 is provided for use in correcting the amount of the shift of the output value of the device.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a detecting device which is arranged in a fluid passage for guiding a fluid such as a pipe disposed in a device such as a water heater, and which accurately detects a flow rate of the fluid. The present invention relates to a combustion device provided with such a detection device.

[0002]

2. Description of the Related Art As a device having a fluid passage therein, there is, for example, a combustion device having a pipeline inside a water heater or the like. Such a combustion device is provided with a hot water supply system for heating hot water and supplying hot water, or a reheating system for circulating and heating hot water in a bath tub, and a heat receiving tube communicating with this hot line is heated by a burner. Through a heat exchanger to be heated.

[0003] In such a hot water supply or circulation pipe, there is provided a fluid flow rate detecting device for detecting the flow rate of hot water passing through the pipe. The combustion control of the combustion section is performed.

As such a fluid flow detecting device, specifically, for example, a flow sensor as a flow sensor as shown in FIG. 8 is used. This flow sensor 1
When water is supplied into the cylindrical body 2, the turbine 3 disposed in the body 2 is rotated. The turbine 3 is provided with a ring-shaped magnet 4 in which N poles and S poles are alternately magnetized along a rotating circumferential direction. The phase change of the magnetic field by the magnet 4 corresponding to the rotation of the turbine 3 is provided. To Hall IC5
To detect and extract it as a signal. Therefore, based on the signal of the Hall IC 5,
The presence or absence of hot water and the flow rate of hot water in the pipeline can be detected.

On the other hand, FIG. 9 shows an example of a flow switch for checking the presence or absence of flowing water, not the flow rate of hot water.
The flowing water switch 6 includes a body 7, in which a space S1 is formed, and the space S1 communicates with an inlet pipe 7a and an outlet pipe 7b. Further, a swing plate 8 is provided in the space S1, and when water feeds into the space S1, the swing plate 8 swings by receiving the water pressure. The swing plate 8 is provided with a magnet 8a. On the other hand, a reed switch 9 is arranged on the body 7 side. As a result, in FIG.
When the swing plate 8 is swung in the direction of the arrow from the space S, the magnetic field of the magnet 8a of the swing plate 8 acts on the reed switch 9 to turn on its contact. As a result, it is detected that flowing water exists in the pipeline.

[0006]

However, in the flow sensor 1 and the flowing water switch 6 as described above, like the turbine 3 and the swing plate 8, the flowing water is in direct contact with the flowing water so as to respond to the flowing water. It has a part that operates mechanically. The presence of such an operation unit causes a problem that, for example, if dust in running water or, for example, hair flowing through a reheating line becomes entangled, a malfunction occurs and correct detection becomes impossible. There is also a method in which a sensor made of a semiconductor is provided at a position where flowing water in a pipe line comes into contact without providing such an operation unit. However, when such a sensor unit is disposed in a pipe through which flowing water flows, dust and other substances such as scales and scales caused by water impurities adhere to the sensor unit during long-term use, There has been a problem that the detected value is affected.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and does not require a mechanically operating portion which causes malfunction, and can correct a detected value to a correct value even when used for a long time. It is an object of the present invention to provide a fluid flow rate detection device capable of performing the above and a combustion device using the same.

[0008]

According to the present invention, there is provided a fluid flow detecting device disposed in a fluid passage for guiding a fluid, the fluid flow detecting device being disposed in the fluid passage and flowing through the fluid passage. A flow rate sensor that contacts the fluid sensor, and a temperature correction sensor that is disposed in contact with the fluid in the fluid passage to temperature-correct the output of the flow rate sensor when the flow rate sensor measures the flow rate of the fluid. This is achieved by a fluid flow rate detection device including output value correction means for correcting a shift amount in response to a shift in the output value of the device caused by use.

In the present invention, the flow sensor is disposed in the fluid passage. These flow sensors are adapted to contact a fluid. Further, the temperature correction sensor is arranged to be in contact with the fluid in order to correct the temperature of the output of the flow sensor when the fluid sensor measures the flow rate of the fluid. Further, when one or both of the flow sensor and the temperature sensor have a deviation in the detected value, the detected value is corrected by the output value correcting means, so that a correct flow rate can be detected.

The output value correcting means may be configured to estimate a deviation amount of the output value based on a lapse of time and correct the deviation amount. This makes it possible to predict the deviation of the output value based on the time for correcting the output value of the flow rate sensor and / or the temperature correction sensor, thereby making it easy to take measures.

Preferably, the output value correction means includes a timer for measuring a time from the start of use of the detection device, and a memory storing a correction value prepared in advance corresponding to a lapse of time and a difference between the detection value of the detection device. A control device for reading a correction value from the memory in accordance with the elapsed time measured by the timer. In this case, the output value correcting means may be configured to correct the output value based on a table reference value provided in a memory in advance. Thereby, a correction value for correcting the output value of the flow rate sensor and / or the temperature correction sensor can be prepared in advance.

In the present invention, the above object is achieved by a combustion unit for burning a fuel gas to heat a fluid passed through a fluid passage, and a control device connected to the combustion unit for performing combustion control. A combustion device comprising: a fluid flow detection device that detects a flow rate of a fluid flowing through the fluid passage, and sends a detection value to the control device, wherein the fluid flow detection device is disposed in the fluid passage; A flow rate sensor that comes into contact with the fluid, a temperature correction sensor that is arranged to be in contact with the fluid, in order to correct the temperature of the output of the flow rate sensor when the flow rate sensor measures the flow rate of the fluid, and the flow rate sensor and And / or corresponding to the deviation of the output value of the temperature compensation sensor,
This is achieved by a combustion device comprising: an output value correcting unit that corrects the shift amount. Thus, in this combustion device, when one or both of the flow rate sensor and the temperature sensor have a deviation in the detection value, correct detection of the flow rate can be performed by correcting the detection value by the output value correction means. , More accurate automatic driving becomes possible.

[0013]

Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. The embodiments described below are preferred examples of the present invention, and therefore, various technically preferable limitations are given. However, the scope of the present invention particularly limits the present invention in the following description. The embodiment is not limited to these embodiments unless otherwise stated.

FIG. 1 shows an example of the configuration of a combustion apparatus provided with a fluid flow detecting device according to an embodiment of the present invention. FIG.
In this combustion apparatus 10, one or a plurality of burners and one heat exchanger are accommodated in one can (the inner body of the heat exchanger), and the heat exchanger is provided with a water supply system and a reheating system. It is an example of a one-can-two-water-channel combustion device passing through a water channel. First, the configuration of the combustion device 10 will be described.

The combustion device 10 has one heat exchanger 13 in a can 11. A combustion section 12 is provided below the heat exchanger 13, and the combustion section 12 is provided with one burner 15. The burner 15 is connected to a supply pipe 15a for a fuel gas drawn from the outside.
A main solenoid on-off valve 22 and a proportional solenoid valve 21 are connected to the gas supply pipe 15a. Thereby, the main solenoid on-off valve 2
2, the fuel gas is drawn in from the outside, and the supply amount of the fuel gas is adjusted by the electromagnetic proportional valve 21.

An electric fan 17 for sending combustion air is arranged below the burner 15. An igniter (not shown) serving as ignition means, a frame rod 16 for checking combustion, and the like are provided near the flame opening of the burner 15. The end of the frame rod 16 is arranged in a combustion flame,
During combustion, the flame current is detected.

Above the burner 15, one heat exchanger 1
3 and an exhaust passage 48 above the heat exchanger 13.
Is provided. As a result, the heat exchanger 13 is heated by the combustion of the burner 15, and the exhaust gas is led to the outside via the exhaust passage 48. Heat exchanger 13
Are provided with a large number of fins 14, and a heat receiving pipe 30 a for a hot water supply system and a heat receiving pipe 50 a for a reheating system (bath system) 50 are arranged so as to penetrate the fins 14. Thereby, each of the heat receiving tubes 30a and 50a is heated by one heat exchanger 13 at the same time. Further, a temperature fuse 47 is disposed near the heat exchanger 13,
When the temperature of the heat exchanger 13 rises to an abnormally high temperature, the fuse 47 is blown. As a result, the power supply to the wiring connected to the thermal fuse 47 is cut off and detected by the control device 18 described later.

The reheating line 50a of the reheating system 50 is connected to a reheating line 51 provided between the reheating tube 50a and the circulation fitting 58 of the bathtub 57. At one end (entrance side) of the heat receiving tube 50a, a return pipe 52 of a pipe 51 is provided.
The other end (outside) of Oa is connected to an outgoing pipe 53 of a reheating pipe line 51 so as to constitute a circulation pipe as a whole.

A return pipe 52 for drawing water from the bathtub 57 has a bath fluid flow detecting device 1 for detecting the amount of water.
00 and a bath thermistor 5 for detecting the temperature of the bath water
5 and a circulation pump 54 for drawing water from the bathtub 57 are provided. A pressure sensor (not shown) is provided at a predetermined location of the additional heating pipe 51 or the branch pipe 42 so that the water level of the bathtub 57 can be detected. The structure of the fluid flow detection device 100 will be described later in detail.

On the other hand, in the hot water supply system 30, a water supply pipe 31 for drawing in water from the outside is connected to one end (entrance side) of the heat receiving pipe 30a, and heated water is supplied to the other end (outside). A hot water supply pipe 32 for tapping the hot water is connected. Water supply pipe 31
Is a flow sensor 35 for detecting the presence and amount of water flow introduced from the outside, a water amount control valve 36 composed of, for example, a gear motor described later, and a water input thermistor 37 for detecting the temperature of introduced water. It is connected. In the vicinity of the heat exchanger 13 in the middle of the heat receiving pipe 30a of the hot water supply system,
A thermistor 44 as temperature detecting means is attached.

The thermistor 39 is connected to a hot water supply pipe 32 connected to a place outside the heat exchanger 13 from the heat receiving pipe 30a.
Is connected. By branching a portion of the water supply pipe 31 downstream of the flow sensor 35 and upstream of the water amount control valve 36, and connecting a point of the hot water supply pipe 32 downstream of the thermistor 39,
A bypass means 34 is provided. The bypass means 34 is provided with a bypass valve 38 for varying the bypass flow rate. The bypass valve 38 is controlled by, for example, a gear motor as described later. A fixed bypass 33 is provided which branches the water supply pipe 31 downstream of the water input thermistor 37 and connects the hot water supply pipe 32 with a portion upstream of the second thermistor 39, and whose flow rate does not change.

A thermistor 41 is provided downstream of the connection point of the hot water supply pipe 32 with the bypass means 34. Further, the hot water supply pipe 32 branches downstream from the thermistor 39 and is connected to one end of a branch pipe (pouring pipe) 42. The other end of the branch pipe 42 is connected to the pump 54 of the additional heating line 51 described above. It is connected downstream. A pouring solenoid valve 43 is set in the branch pipe 42.

This combustion device 10 is provided with a control device 18 shown in FIG. 1 and FIG. The control device 18 is configured as, for example, a control board of the combustion device 10. The control device 18 is connected to a recoat control device (hereinafter referred to as a “remote control”) 19, and the hot water supply system 3 is controlled via the remote control so as to reach a set temperature set by a user.
That is, so-called automatic operation is performed in which the bathtub 57 is filled with water so as to control the temperature to 0 or the set water level, and the reheating system 50 is controlled so that the water can be reheated to the set temperature. .

The combustion unit 12 is connected to the control device 18 shown in FIG. The combustion unit 12 includes an ignition means for the burner 15 described above, a proportional valve 21 for supplying fuel gas to the burner 15, an on-off valve 22, and the like, and further includes a means for controlling combustion such as a pressure sensor (not shown). In.

The control device 18 includes an electric fan 17 for sending air for combustion to the combustion section, a bypass valve 38 for adjusting the flow rate of the bypass means, a water amount control valve 36 for adjusting the amount of water supplied to the water supply pipe, and a branch pipe 42. Pouring solenoid valve 42 that opens and closes,
A flow detection device 100 described later is connected.

The combustion device 10 is operated, for example, as follows. First, the hot water supply operation will be briefly described. When the user turns on the remote control 19 and opens the hot water tap (not shown) of the hot water supply pipe 32, water is supplied from outside to the water supply pipe 31, and the flow sensor 35 detects this, and the control device 18
Send a signal to The control device 18 issues an instruction to the combustion unit 12, instructs the main solenoid on-off valve 22 and the proportional solenoid valve 21, respectively, introduces fuel into the burner 15, and starts combustion using ignition means such as an igniter (not shown). . The flame rod 16 detects a flame current in the combustion flame, and confirms ignition and monitors the state of continued combustion.

The fins 14 of the heat exchanger 13 are heated by the combustion of the burner 15, and this heat is exchanged with the water flowing from the water supply pipe 31 to the heat receiving pipe 30 a, and is discharged through the hot water supply pipe 32. Further, the incoming water thermistor 37 detects the temperature of incoming water introduced from outside, and the thermistor 44 detects the temperature of the heat exchanger 1.
In 3, the temperature of the stagnant water in the heat receiving tube 30 a is detected.
The thermistor 39 detects the temperature of the hot water in the hot water supply pipe on the outlet side of the heat exchanger 13, and the thermistor 41 monitors the actual hot water temperature after mixing by the bypass unit 34.

Therefore, the controller 18 detects the total amount of water taken in by the water amount control valve 36 while observing the detection result of the flow sensor 35. The control device 18 monitors the incoming water temperature by the incoming water thermistor 37, obtains the number of combustion and fuel supply amount required for heating to the temperature set by the remote controller 19 by a predetermined calculation, and controls the combustion. . Then, the control device 18 uses the thermistor 39 to
The temperature of hot water coming out of the heat exchanger 13 is detected, the bypass valve 38 is adjusted to determine a bypass flow rate, the heated hot water and the flow rate of water passing through the bypass means 34 are determined, and the thermistor 41 determines the flow rate. The opening degree of the water amount control valve 36 and the bypass valve 38 is controlled so that the detected hot water temperature matches the set temperature, and mixing is performed so as to obtain an appropriate flow rate ratio.

In the case of additional heating, the remote controller 19 is used.
When the user gives an instruction for additional heating via, the control device 18 drives the additional heating pump 54 to draw water from the bathtub 57 into the additional heating conduit 51. The control device 18 confirms the signal of the water flow detection of the fluid flow detection device 1000, performs the above-described ignition operation, draws the bathtub water into the additional heating line 51, and circulates the pump. Is heated by the heat exchanger 13. At this time, the control device 18
The combustion unit 12 stops the combustion of the burner 15 when the temperature detected by the thermistor 37 reaches, for example, 75 ° C., and resumes the combustion when the temperature falls below 70 ° C. The reason for performing such intermittent combustion is to perform reheating in a short time while preventing the hot water staying in the heat receiving tube 50a in the heat exchanger 13 from boiling. When the temperature detected by the bath thermistor 55 reaches the set temperature instructed via the remote controller 19, the reheating is completed.

The automatic operation in a state in which the bathtub 57 is not filled with water is performed by opening the pouring solenoid valve 43 of the branch pipe 42 and burning the burner 15 from the hot water supply pipe 32 to the reheating line 51.
After warm water is introduced into the bath, the hot water is introduced into the bathtub 57 from the circulation fitting 58 and filled with hot water, and then the above-mentioned reheating operation is performed to boil the hot water. In addition, the hot water supply operation and the reheating operation can be performed simultaneously.

FIG. 6 shows a case where the fluid flow detecting device 100 is constituted as a single unit, and FIG.
FIG. 2 shows an electrical configuration when 0 is incorporated in the combustion device 10. The fluid flow rate detection device 100 has a flow rate sensor 111 and a temperature correction sensor 112 that are arranged as a fluid passage, for example, along the return pipe 52. Further, as shown in FIG. 6, an output value correction unit 73 for correcting the output value is connected to the fluid flow rate detection device 100. This output value correction means 73
Includes a control device 75, a timer 71 and a memory 72 connected to the control device 75. In the case of FIG. 6, the control device 75 is, for example, a CPU having an arithmetic processing function. This configuration will be described later in detail.

First, the configuration of the fluid flow detecting device 100 will be described. The fluid flow sensor 100 includes a flow sensor 111 having exposed surfaces 111a and 112a exposed on the inner surface of the conduit 52, and a temperature correction sensor 112, respectively. As the flow sensor 111, a thermal flow sensor is used. The thermal type flow sensor includes a heat conducting portion made of, for example, copper or the like having an exposed portion 111a in a (circulation) pipe line 52 which is a fluid passage. On the outside of the heat conducting portion, there are provided a heating resistor which is a heating portion (not shown) provided so as to be in thermal contact with the heat conducting portion, and a temperature thermistor provided adjacent to the heating resistor. I have. This temperature thermistor is made of, for example, a temperature-sensitive semiconductor whose resistance value largely changes in response to a temperature change. The heating resistor and the temperature thermistor are arranged on one chip.

Then, by applying a predetermined voltage to the heat generating portion via an external circuit, the heat generating portion generates heat, and the heat is transmitted to the heat conducting portion. Thus, when a fluid such as water passes through the pipe 52, the exposed surface 111a is touched and cooled, and the temperature thermistor detects that the heat of the heat generating portion or the heat conducting portion has dropped. The temperature detected by the temperature thermistor corresponds to the flow rate of the fluid, whereby the current flow rate of the fluid flowing in the pipe 52 is detected. However, since the detection value of the temperature thermistor also changes depending on the temperature of the fluid flowing through the pipeline 52, the temperature correction sensor 112 is provided.

The temperature correction sensor 112 uses, for example, a temperature thermistor whose resistance changes in response to a temperature change, and changes its resistance in accordance with the temperature of the fluid touching the exposed surface 112a. Has become. Thus, by using the output signal of the temperature correction sensor 112, the temperature output and the temperature error of the flow rate sensor 56 based on the water temperature are corrected as follows.

For example, FIG. 4 shows an example of a bridge circuit including a flow sensor 111 and a temperature correction sensor 112. The flow sensor 111 and the comparison resistor R1 are connected in series between the power supply side and the ground side, and further, the temperature correction sensor 112 and the comparison resistor R2 are connected in series between the same power supply side and the ground side. . A contact between the flow sensor 111 and the comparison resistor R1 and a contact between the temperature correction sensor 112 and the comparison resistor R2 are respectively connected to an inverting input terminal and a non-inverting input terminal of the differential amplifier 113, respectively. I have. As a result, the differential amplifier 113
By taking the differential output value of the voltage on the 1 side and the temperature correction sensor 112 side from the output terminal thereof (for example, V1−V2), the water X passing through the fluid passage 52 can be accurately determined according to the temperature of the water X. The flow rate can be detected.

That is, for example, when the flow rate of the fluid in the fluid passage 52 is constant, when the temperature of the water X changes, the voltages at both ends of the flow rate sensor 111 and the temperature correction sensor 113 both rise or fall by the same amount. I do. That is, when the temperature of the water rises, the flow sensor 111 and the temperature correction sensor 1
The voltage across 13 drops by the same amount, and when the water temperature drops,
The voltage at both ends increases by the same amount. Therefore, even if the temperature of the water changes, the value of the differential output value (V1-V2) is constant, but if the flow rate changes, the differential output value (V1-V2) changes, thereby changing the flow rate. Can be detected.

By the way, in the case of the drawing, the flow sensor 111 and the temperature correction sensor 112 are each provided with the exposed portions 111a and 112a at almost the same position on the inner surface of the pipe in the pipe 52.
Is arranged. When the fluid flows through the conduit 52, foreign matter contained in the fluid, such as water or hot water, dirt, hair, or scale, may adhere to the exposed portions 111a and 112b that come into contact with the fluid. In this case, the detection values of the sensors 111 and 112 are rounded, and an accurate flow rate cannot be detected. Thus, in the present embodiment, the detection value is corrected by the following means.

First, according to experiments conducted by the present inventors, it has been found that the degree of adhesion of such foreign substances, particularly scales, increases in accordance with the time during which the apparatus is used.
Further, comparing the flow rate sensor 111 with the temperature correction sensor 112, it has been found that the heat generating flow rate sensor 111 is less likely to adhere to the scale. By such an experiment, the exposed portion 111a of each sensor was obtained.
Based on the measurement result, it is possible to create data for estimating the amount of adhered foreign matter corresponding to elapse of the use time of the apparatus, based on the measurement result.

FIG. 6 shows a fluid flow rate detecting device provided with output value correcting means constructed based on such a study. In the figure, an output value correction means 73 includes a control device 75 connected to the flow rate sensor 111 and the temperature correction sensor 112 of the fluid flow rate detection device 100 via the differential amplifier 113 shown in FIG. A timer 71 and a memory 72 are connected to the device 18.

As the control device 75, for example, a CPU having a predetermined arithmetic processing capability is used. Further, the timer 71 receives a command from the control device 75, measures the time from the start of use of the fluid flow rate detection device 100, and gives the measurement result to the control device 75 constantly or in response to a request from the control device 75. It has become. The memory 72 is formed of, for example, a read-only memory, and has correction data obtained based on the above experiment in advance. That is, as shown in FIG. 7, when the fluid flow detecting device 100 is used for a long time, the fluid flow sensor 111 and the temperature correcting sensor 11 are used.
When foreign matter adheres to each of the exposed portions of No. 2, the output value of the differential amplifier 113 shifts from the original value A to B. This shift amount V0 is measured in advance in relation to the use period. Then, V0, which is a shift amount corresponding to each use period, is created as a table reference value, and the correction data is stored in the memory 72. The timer 71 and the memory 72 may be formed integrally with the control device 75, and the bridge circuit and the differential amplifier 113 shown in FIG.

Thus, the control device 75 sets the timer 71
Of the output value of the differential amplifier 113 is estimated based on the measured time, and the corresponding table reference value is read from the memory 72 as the estimation result to obtain the detected value of the fluid flow rate. Since the detection value of such a fluid flow rate is a detection value that is not affected by the attachment of foreign matter, even when used for a long time,
It becomes more consistent with the actual flow rate. In addition, since the fluid flow detecting device 100 does not have any mechanically operated portions, there is no concern that dust or the like is caught and malfunctions occur as in the related art, and an accurate detection result can always be obtained.

Here, since the flow sensor 111 and the temperature correction sensor 112 differ in the degree of adhesion of foreign matter, correction values for both or one of the sensor output values are obtained by experiments and stored in the memory 72. Alternatively, the correction data may be input to the differential amplifier 113. Further, such correction data is stored in the fluid flow rate detecting device 100.
Depends on the type of fluid passage used, so it must be created for each device used. However, when it is difficult to obtain such various types of data, various alternative methods can be adopted.

For example, if the scale is attached to the reheating line of the combustion apparatus shown in FIG. 1, it is found that the most problematic adhesion of scale as a foreign matter is difficult to attach to the heat generating flow sensor 111. doing. Therefore, the correction data may be created and used only for the temperature correction sensor 112.

FIG. 5 is a block diagram showing a case where a fluid flow detecting device 100 is provided in the combustion device 10 of FIG. In this case, the control device 18 also serves as a control unit for controlling the operation of the combustion device 10 and a control device for the fluid flow rate detection device 100. Further, the flow rate sensor 111 and the temperature correction sensor 1
12, the timer 71, and the memory 72 have the same configuration as in FIG. 6 and exhibit the same functions.

Therefore, in such a combustion device 10, the fluid flow rate detection device 100 has no mechanically operated portion, so that there is no concern that dust or the like may be caught and cause a malfunction, unlike a conventional device, and the fluid flow rate detection device 100 is always accurate. Then, the presence of the fluid in the pipeline 52 is detected, and an accurate detection result can be obtained for the flow rate. In particular, even when dirt or scale adheres in the reheating line 52, an accurate detection result can be obtained by using the correction value prepared in advance as described above.
Even in long-term use, more accurate automatic operation than before can be performed.

The flow rate sensor and the temperature correction sensor of the fluid flow rate detecting device according to the present invention are not limited to one set, but a plurality of sets may be provided, attached to each other, and controlled by one controller. In this case, if the conditions are met, one set of output value correction means may correct all sets of sensors. The tube forming the fluid passage is not limited to a cylindrical tube, but may have another cross-sectional shape. As a device to which the fluid flow detecting device of the present invention is applied, a so-called one-can-two-channel combustion device is taken as an example. However, the present invention is not limited to this, and other types of devices or field devices having completely different areas are applicable. The present invention can be applied to any one having a passage for passing a fluid. The fluid is not limited to water, but may be another type of fluid.

[0047]

As described above, according to the present invention, it is possible to correct a detected value to a correct value even when used for a long period of time without requiring a mechanically operating part which causes a malfunction. A fluid flow detection device and a combustion device using the same can be provided.

[Brief description of the drawings]

FIG. 1 is a diagram showing a combustion device as an example of a device including a fluid flow detection device according to the present invention.

FIG. 2 is a perspective view showing a preferred embodiment of a fluid flow detecting device of the present invention.

FIG. 3 is a partially cutaway sectional view showing the inside of the fluid flow detecting device of FIG. 2;

FIG. 4 is a diagram showing a bridge circuit having a flow sensor and a temperature correction sensor.

FIG. 5 is a block diagram illustrating an electrical configuration of the combustion device of FIG. 1;

FIG. 6 is a block diagram illustrating an electrical configuration of a preferred embodiment of the fluid flow rate detection device according to the present invention.

FIG. 7 is a graph showing correction data in the fluid flow detection device of FIG.

FIG. 8 is a diagram showing an example of a conventional fluid flow detection device.

FIG. 9 is a diagram illustrating an example of a conventional fluid detection device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Combustion device 12 Combustion part 15 Burner 18 Control device 19 Remote control 30 Hot water supply system 42 Branch pipe 50 Additional heating system 52 Additional heating pipe 57 Bathtub 71 Timer 72 Memory 73 Output value correction means 100 Fluid flow rate detection device 111 Flow rate sensor 112 Temperature correction Sensor

Claims (8)

[Claims] A fluid flow detecting device disposed in a fluid passage for guiding a fluid, a flow sensor disposed in the fluid passage and in contact with a fluid flowing through the fluid passage, and the flow sensor detects a flow rate of the fluid. A temperature correction sensor disposed in the fluid passage so as to be in contact with the fluid in order to correct the temperature of the output of the flow sensor during measurement; An apparatus for detecting a fluid flow rate, comprising output value correction means for correcting a shift in response to a shift in a value. 2. The apparatus according to claim 1, wherein the output value correction unit estimates a deviation amount of the output value based on a lapse of time and corrects the deviation amount. 3. The fluid flow rate detection device according to claim 1. 3. The output value correction means includes: a timer for measuring a time period from the start of use of the detection device; and a memory storing a correction value prepared in advance corresponding to a lapse of time and a difference between the detection value of the detection device. 3. The fluid flow detecting device according to claim 1, further comprising a control device that reads a correction value from the memory in accordance with the elapsed time measured by the timer. 4. The apparatus according to claim 1, wherein said output value correction means corrects the output value based on a table reference value provided in a memory in advance. Fluid flow rate detection device. 5. A combustion section for burning a fuel gas to heat a fluid passed through a fluid passage, a control device connected to the combustion section for controlling combustion, and detecting a flow rate of the fluid flowing through the fluid passage. And a fluid flow detecting device for sending the detected value to the control device, wherein the fluid flow detecting device is disposed in a fluid passage and is in contact with a fluid. A temperature correction sensor arranged to be in contact with the fluid in order to correct the temperature of the output of the flow sensor when measuring the flow rate of the fluid; and a deviation of the output value of the flow rate sensor and / or the temperature correction sensor. A combustion apparatus comprising: an output value correction unit configured to correct the shift amount in response to the above. 6. The flow rate sensor and the temperature correction sensor,
Regarding the adhesion condition of the foreign matter adhering to each sensor in response to the passage of the fluid in the fluid passage, each of the sensors is arranged at a location having substantially the same condition,
The combustion device according to claim 5. 7. The apparatus according to claim 5, wherein the output value correction unit estimates a deviation amount of the output value based on a lapse of time and corrects the deviation amount. The combustion device according to claim 1. 8. The apparatus according to claim 5, wherein said output value correction means corrects the output value based on a table reference value provided in a memory in advance. Combustion equipment.