JP2000065615A - Strainer-integrated type flowmeter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a flowmeter integrated with a strainer in which a foreign matter is hard to intrude, the air is not left in a circulation pipe, a flow rate of a kerosine circulating in a piping can be correctly measured for a long period of time and can be recognized immediately. SOLUTION: A flowmeter 1 integrated with a strainer is constituted of a strainer part 3 including a housing 2 where a circulation passage 7 is formed, a filter member 9 and a filter member insertion cylindrical body 10, and a flowmeter part 4 including the housing 2 where a circulation passage 8 is formed and a flow rate sensor 26. The housing 2 is shared between the strainer part 3 and flowmeter part 4 and formed in one piece. The flowmeter part 4 is disposed downstream in a flow direction of a fluid. An exhaust hole is formed to the housing 2 to be connected with the circulation passage 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe for supplying kerosene to a kerosene combustion apparatus such as a stove or a boiler.
The present invention relates to a strainer-integrated flowmeter capable of removing foreign substances such as dust and dirt and measuring the flow rate of kerosene.

[0002]

2. Description of the Related Art Kerosene combustion devices such as stoves and boilers use heat generated by burning kerosene.
It heats air to heat the room, heats water to boil a large amount of hot water, and generates high-pressure steam as a power source. Boiler 20 shown in FIGS. 12 and 13
In 1, kerosene is supplied from a tank 202 via a pipe 203, and the kerosene is burned while being jetted out in a mist by a burner 204, and a large amount of hot water is boiled or high-pressure steam is generated by heat generated at this time. The combustion gas into the chimney 205
It is designed to be discharged from. And the tank 202
A strainer 207 for removing foreign matters such as dust and dirt is disposed between the pump 206 and the pump 206.
4, a flow meter 208 for measuring the flow rate of kerosene is provided.

[0003]

However, the strainer 2
07 gradually accumulates or foreign matter enters between the strainer 207 and the burner 204, the foreign matter cannot be removed, and the foreign matter enters the nozzle 209 of the burner 204. And the discharge port 20
9a may be partially closed. In such a case, since the amount of kerosene flowing through the nozzle 209 decreases, the performance of the burner 204 is not sufficiently exhibited, and the amount of heat generated in the boiler 201 decreases. In addition, kerosene incompletely burns, the energy possessed by the kerosene is dissipated wastefully, and incomplete combustion gas such as carbon monoxide is generated,
Became a source of air pollution.

As a method for solving this problem, the flow rate of kerosene flowing through the pipe 203 is measured by a flow meter 208 disposed in the pipe path, and an appropriate amount of air corresponding to the measured value is supplied to burn the kerosene. There is proposed an air-fuel efficiency control method to be performed. According to this, the discharge port 209a of the nozzle 209
Even if partly clogged, there is no incomplete combustion,
Waste of energy possessed by kerosene and air pollution due to incomplete combustion gas can be prevented. Then, if the foreign matter in the nozzle 209 is discharged from the discharge port 209a due to the jet pressure of kerosene or the like, the original performance of the burner 204 is exhibited,
The calorific value of the boiler 201 returns to normal.

[0005] In implementing the air-fuel efficiency control method,
It is necessary to accurately measure the flow rate of kerosene flowing through the pipe 203 by the flow meter 208 disposed in the pipe path. However, since the conventional flow meter 208 is disposed considerably downstream of the strainer 207, minute foreign matter that has passed through the strainer 207 gradually accumulates or foreign matter enters between the strainer 207 and the flow meter 208. I do. And
When these foreign substances enter the flow meter 208 and adhere and accumulate on the O-ring of the sensor mounting portion, for example, a kerosene leaks by forming a gap or adheres and accumulates on the fin plate of the sensor, and the heat transfer area increases. The measurement accuracy of the flowmeter 208 was greatly reduced due to the decrease or the change in the flow state.

In such a case, it is necessary to temporarily remove the flow meter 208 from the piping, clean the flow meter 208, or replace defective parts, and then attach the flow meter 208 to the piping again. However, when the flow meter 208 is reattached, air remains in the flow pipe, and if kerosene is allowed to flow through the flow pipe as it is, it stays as air bubbles in the upper part of the flow pipe, and this air bubble is generated by the fin plate of the sensor. If it adheres to and accumulates on the flow, the heat transfer state changes and the flowmeter 2
The measurement accuracy of 08 significantly decreased.

Further, according to the air-fuel efficiency control method, incomplete combustion can be prevented, but the decrease in the amount of heat generated in the boiler 201 cannot be prevented, and foreign matter in the nozzle 209 is discharged from the discharge port 209a. If the ink is not ejected, the foreign matter must be artificially removed after all.
However, the conventional flow meter 108 does not allow the operator to immediately recognize the flow rate of kerosene, and cannot immediately perform the operation of removing foreign matter from inside the nozzle 109.

The present invention has been made in order to solve such a problem, and it is difficult for foreign substances to enter the flow meter, does not leave air in the flow pipe, and reduces the flow rate of kerosene flowing through the pipe for a long time. It is an object of the present invention to provide a strainer-integrated flow meter that can accurately measure the flow rate of kerosene and can immediately recognize the flow rate of kerosene.

[0009]

SUMMARY OF THE INVENTION To achieve the above object, the present invention provides a housing having a flow passage, a strainer provided with a filter member and a filter member insertion cylinder, a housing having a flow passage formed therein, A flow meter unit having a sensor, wherein the strainer unit and the housing of the flow meter unit are shared and integrated, and the flow meter unit is disposed downstream in the flow direction of the fluid, and a strainer integrated flow meter is provided. It is what constituted.

[0010] In order to prevent air bubbles from staying in the upper part of the flow passage, it is preferable to form an exhaust hole in the housing by connecting to the flow passage.

In order that the operator can immediately recognize the flow rate of kerosene, the flow meter section detects the flow rate value by using a display section for displaying a flow rate value, an operation section for supplying power and measuring the flow rate, and the flow rate sensor. Preferably, an electric circuit for displaying the flow rate on the display unit is provided.

In order to perform high-sensitivity flow rate detection, the flow rate sensor includes a flow rate detection unit having a heating element and a temperature sensing element formed on a substrate, a fin plate that transfers heat between a fluid to be detected, and a fin plate. An output terminal for outputting a voltage value corresponding to the flow rate is preferably provided, and the flow rate detector, a part of the fin plate, and a part of the output terminal are preferably covered by molding.

[0013] In order to reduce the error of the flow measurement value due to the temperature of the kerosene, the flow meter section preferably includes a temperature sensor for detecting the temperature of the fluid.

In order to perform highly sensitive temperature detection,
The temperature sensor has a temperature detection unit having a temperature-sensitive body formed on a substrate, a fin plate that performs heat transfer with a fluid to be detected, and an output terminal that outputs a voltage value corresponding to the temperature. It is preferable that the temperature detector, a part of the fin plate, and a part of the output terminal are covered by molding.

The electric circuit includes a temperature sensing element of the flow sensor, a temperature sensing element of the temperature sensor, a bridge circuit that outputs a voltage difference corresponding to a flow rate of the fluid, and a voltage sensing circuit corresponding to a flow rate of the fluid. If it has a V / F conversion circuit for converting to a pulse signal of a frequency to be changed, a counter for counting this pulse signal, and a microcomputer for converting to a flow rate corresponding to the frequency, the measured value of the flow rate is digitally displayed on the display unit. be able to.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a strainer-integrated flow meter according to the present invention will be described below with reference to the drawings. As shown in FIGS. 1 to 3, the strainer-integrated flowmeter 1 is such that the housing 2 is shared and the strainer unit 3 and the flowmeter unit 4 are integrated.

The housing 2 is formed by casting (die-casting) aluminum, zinc, tin alloy, or the like, and has connection portions 5 and 6 for connecting to external piping at both ends thereof. A side flow path 7 and an outflow side flow path 8 are formed.

The strainer section 3 comprises a lower half of the housing 2, a filter member 9 and a filter member insertion cylinder 10.

The lower half portion of the housing 2 is formed with a cylindrical mounting portion 11 slightly swelling downward, and a mounting concave portion 12 is formed inside the cylindrical mounting portion 11. A fitting projection 13 is provided at the center of the mounting recess 12 and a female screw 14 is threaded on the inner periphery. Mounting recess 1
A vertical portion 7b of the inflow-side flow passage 7 opens on the upper wall surface, and a vertical portion 8a of the outflow-side flow passage 8 opens on the lower end surface of the fitting projection 13. An exhaust hole 15 is connected to the vertical portion 7b of the inflow-side flow passage 7 at an upper portion. A female screw 15a is threaded into the exhaust hole 15, and a sealing member 16 is screwed into the female screw 15a. It is fastened.

The filtering member 9 includes a holder 17 and a filter 18. The holder 17 is formed by casting (die-casting) aluminum, zinc, a tin alloy, or the like. The flanges 19 on both ends are connected by a connecting portion 20, and the through hole 2 is formed at the center.
1 is formed. The connecting portion 20 has a small diameter communication hole 2.
2 are formed in large numbers. The filtering material 18 is a nonwoven fabric made of glass fiber, plastic fiber, or the like.
Is mounted on the outer peripheral surface of the connecting portion 20.

The filter member insertion cylinder 10 is made of aluminum,
It is made by casting (die-casting) zinc, tin alloy, or the like, and has a male screw portion 23 threaded on the outer peripheral portion at the upper end. The filter member 9 is provided at the center of the bottom surface of the filter member insertion cylinder 10.
Is mounted, and the male screw part 23 of the filter member insertion cylinder 10 is screwed into the female screw part 14 of the mounting recess 12, and the upper end surface of the filter member insertion cylinder 10 is interposed via a thin annular seal member 24. The upper end opening of the through-hole 21 of the filter member 9 is closed by the fitting projection 13 when the filter abuts on the upper wall surface of the mounting recess 12.

The filter member 9 is placed on the center of the bottom surface of the filter member insertion tube 10 and the male screw portion 23 of the filter member insertion tube 10 is mounted.
Is screwed into the female screw portion 14 of the mounting recess 12 so that the filtering member 9
Attach. Then, the kerosene is caused to flow in the flow passage, and after confirming that no air remains in the flow passage, the sealing member 16 is fastened to the exhaust hole 15.

When the kerosene flows through the inlet side flow passage 7 of the housing 2 and flows into the filter member insertion cylinder 10 through the opening of the vertical portion 7a, the kerosene flows down along the outer periphery of the filter member 9,
The filter member stays on the bottom surface of the insertion member 10. And
Foreign substances such as dust and dust are removed while passing through the filtering material 18,
After passing through the communication hole 22 of the holder 17, it flows into the through hole 21, flows from the opening of the vertical portion 8 a of the outflow side flow passage 8 to the outflow side flow passage 8, and flows to the flow meter unit 4. .

The flow meter unit 4 includes an upper half of the housing 2, a lid 25, a flow sensor 26, a temperature sensor 27,
It comprises a display unit 28, an operation unit 29, and a circuit board 30.

A sensor mounting portion 31 raised to the left is formed in the upper half of the housing 2, and a sensor insertion space 32 is defined on the left portion of the sensor mounting portion 31. From the vertical portion 8 of the outlet side flow passage 8
Sensor insertion holes 33 and 34 are formed toward a. Openings 35 and 36 are formed at positions corresponding to the sensor insertion holes 33 and 34 in the vertical portion 8a of the outflow side passage 8.

The lid 25 is formed by casting (die casting) aluminum, zinc, tin alloy, or the like, and is detachably attached to the left end of the sensor mounting section 31.

The flow sensor 26 is, as shown in FIG.
It comprises a flow detecting section 37, a fin plate 38, an output terminal 39 and a covering member 40.

As shown in FIG. 5, the flow rate detecting section 37 includes an insulating layer 42, a thin-film heating element 43, electrode layers 44 and 45, an insulating layer 46, a thin-film temperature sensing element 47, and an insulating layer 48 on a substrate 41 in this order.
Are laminated and formed.

The substrate 41 is a rectangular plate made of silicon, alumina, or the like and having a thickness of about 600 μm and a size of about 2 × 3 mm. As shown in FIG. 550μm depth by etching, etc.
Recess 49 is formed. On the other side of the substrate 41 on which the heating element 43 and the temperature sensing element 47 are stacked, a preparation 50 made of glass and having a thickness of 50 to 200 μm is fixed, and the recess 49 is completely sealed.

The heating element 43 is made of cermet having a thickness of about 1 μm and patterned into a desired shape.
Numeral 45 is formed by stacking nickel having a thickness of about 0.5 μm or gold having a thickness of about 0.5 μm. The temperature sensing element 47 is
It is formed of a stable metal resistor film having a large temperature coefficient, such as platinum or nickel, having a film thickness of about 0.5 to 1 μm and having a desired shape, for example, a meandering pattern, such as platinum or nickel, or a manganese oxide NTC thermistor. The insulating layers 42, 46, and 48 have a thickness of 1 μm.
Of SiO ₂ .

The fin plate 38 is made of a material having good thermal conductivity such as copper, duralumin, and a copper-tungsten alloy, and is a thin rectangular plate having a thickness of about 200 μm and a width of about 2 mm.

As shown in FIG. 4, the flow rate detector 37 includes a heating element 43 and a temperature sensing element 47 on the upper end surface of the fin plate 38.
The bonding material 51 such as a silver paste is
It is fixed through. Then, it is connected to the output terminal 39 by a bonding wire 52, and the flow rate detecting section 37,
The upper half of the fin plate 38 and the lower half of the output terminal 39 are covered with a covering member 40 by molding.

Although various methods can be adopted as a method of manufacturing the flow sensor 26, the fin plate 38 and the output terminal 39 may be integrated.
For example, as shown in FIG. 7, after the plate material 53 is etched to form a plate base material 54 having a predetermined shape, a portion where the flow rate detecting unit 37 is joined is sequentially subjected to silver plating.
The flow rate detector 37 is fixed by applying silver paste, the flow rate detector 37 and the output terminal 39 are connected by wire bonding, and a portion corresponding to the fin plate 38 is nickel-plated. Then, the flow sensor 26, the upper half of the fin plate 38, and the lower half of the output terminal 39 may be molded with epoxy resin to manufacture the flow sensor 26 as shown in FIG.

The temperature sensor 27 comprises a temperature detecting section 55, a fin plate 56, an output terminal 57, and a covering member 58. The heating element 43 of the flow rate detecting section 37, and the electrode layers 44, 4 are provided.
5, except that it does not have the insulating layer 46.
Also, as a method of manufacturing the temperature sensor 27, a method similar to that of the flow sensor 26 can be employed.

The flow sensor 26 heats the temperature sensing element 47 by energizing the heating element 43, and detects a change in the electric resistance value of the temperature sensing element 47. Here, flow sensor 2
6 is installed in the outflow side flow passage 8,
Is released into the kerosene flowing through the outflow-side flow passage 8 via the fin plate 38, and the amount of heat transmitted to the temperature sensing element 47 is obtained by subtracting the amount of heat released.
Since the amount of heat dissipated changes in accordance with the flow rate of kerosene, by detecting a change in the electric resistance value of the temperature sensing element 47 that changes according to the amount of heat supplied, the outflow side flow passage 8 is detected.
This means that the flow rate of kerosene flowing inside can be measured.
Since the amount of heat dissipated also changes depending on the temperature of kerosene, as shown in FIG. 3, a temperature sensor 27 is installed at an appropriate position of the outflow side flow passage 8 to change the electric resistance value of the temperature sensing element 47. A temperature compensation circuit is added to the detected flow rate detection circuit to minimize the error of the flow rate measurement value due to the temperature of kerosene.

The flow rate sensor 26 has a concave portion 49 formed in the substrate 41 of the flow rate detecting section 37 to provide an air layer having a high heat insulating effect, and a heating element 43 and a temperature sensitive element on the upper end surface of the fin plate 38. Since the surfaces where the 47 are stacked face each other and the flow detecting unit 37 is fixed, the area where the covering member 40 contacts the heating element 43 and the temperature sensing element 47 is reduced as much as possible. Also, fin plate 3
The amount of heat transmitted through 8 flows out or inflows to the covering member 40 very little. Therefore, even when the specific heat of the fluid is small or the flow rate is small, the flow rate sensor 2
6 does not lower the sensitivity.

The flow sensor 26 is provided with a flow detecting unit 3
7. Since the upper half of the fin plate 38 and the lower half of the output terminal 39 are covered with the covering member 40 by molding, they can be securely inserted into the sensor insertion holes 33 and 34 of the housing 2 and the sealing state is incomplete. As a result, the amount of heat transmitted through the fin plate 38 flowing out or flowing into the housing 2 is extremely reduced. Also from this point, the sensitivity of the flow rate sensor 26 is not reduced even when the specific heat of the fluid is small or the flow rate is small.

Further, the flow rate sensor 26 is formed by integrating the flow rate detecting section 37, the upper half of the fin plate 38, and the lower half of the output terminal 39 with a covering member 40 formed by molding. Since it is only required to be inserted into the sensor insertion holes 33 and 34, the incorporation into the housing 2 is extremely simple, and the fixing state is stable and the durability is high.

The display unit 28 and the operation unit 29 are disposed on the upper surface of the lid 25 as shown in FIGS. The display unit 28 is a liquid crystal panel, and is configured to digitally display a measured value of the flow rate. The operation unit 29 includes a power button 59 and a measurement button 60.
Power is supplied by pressing the button 9 and measurement is enabled by pressing the measurement button 60.

As shown in FIGS. 1 and 3, the flow rate sensor 26 and the temperature sensor 27 are inserted from the sensor insertion space 32 of the housing 2 into the sensor insertion holes 33 and 34, and the lower half portions of the fin plates 38 and 56 are The openings 35 and 36 of the outflow-side flow passage 8 are inserted and positioned in the outflow-side flow passage 8, and the lower ends of the fin plates 38 and 56 are connected to the outflow-side flow passage 8.
To the right of the axis. The flow sensor 26, the temperature sensor 27 and the sensor insertion hole 3
O-rings 61 and 62 are interposed between the O-rings 3 and 34 to prevent fluid leakage from these gaps.

After the flow sensor 26 and the temperature sensor 27 are inserted, the sensor pressing plate 63 is inserted into the sensor insertion space 32.
To press the upper surfaces of the covering members 40 and 58 of the flow sensor 26 and the temperature sensor 27. Further, the circuit board 30 is inserted and arranged in the sensor insertion space 32, and the lid 25 is mounted and fixed on the sensor mounting section 31, and the flow meter section 4 is mounted.
Is configured.

The circuit board 30 is electrically connected to the flow sensor 26, the temperature sensor 27, the display unit 28, the operation unit 29, and the power cord 64 (not shown). The circuit is configured.

First, an AC 100 V as a power supply is appropriately converted into a DC having a voltage value by a DC converter 65. The obtained DC voltage is stabilized by the voltage stabilizing circuit 66, and the voltage is supplied to the heating element 43 and the bridge circuit 67 of the flow sensor 26. The bridge circuit 67 includes a temperature sensing element 47 of the flow sensor 26, a temperature sensing element 68 of the temperature sensor 27, a resistor 69, and a variable resistor 70, and the electric resistance value of the temperature sensing element 47 changes according to the flow rate of kerosene. Therefore, the voltage difference Va-Vb at the points a and b of the bridge circuit 67 also changes.

The voltage difference Va-Vb is determined by the differential amplifier 71,
It is input to the V / F conversion circuit 73 via the integration circuit 72,
In the V / F conversion circuit 73, a pulse signal having a frequency corresponding to the input voltage signal is formed. The frequency of the V / F conversion circuit 73 is formed based on a reference frequency set by a high-precision clock in a reference frequency generation circuit 75 based on the oscillation of the temperature-compensated crystal resonator 74.

When the pulse signal output from the V / F conversion circuit 73 is input to the transistor 76, a current flows through the heating element 43 to generate heat. The pulse signal is counted by the counter 77 and converted into a flow rate corresponding to the frequency in the microcomputer 78. The flow value is digitally displayed on the display unit 28 and stored in the memory 79. Reference numeral 80 denotes a backup power supply such as a battery.

As described above, since the strainer-integrated flow meter 1 of the present invention integrates the strainer and the flow meter and shares the housing, the number of parts can be reduced.
Manufacturing costs and assembly costs can be reduced.

Next, the strainer-integrated flow meter 1 of the present invention
The method of using and the operation and effect thereof will be described.

The strainer-integrated flow meter 1 is installed between a tank 102 and a pump 106, that is, at a position where a strainer 107 is provided, in a pipe line for supplying kerosene to a kerosene combustion device. The strainer 107 removes foreign substances such as dust and dirt contained in kerosene by adsorbing the filter medium, and when the adsorbing performance of the filter medium is reduced, the filter medium is washed and replaced. Strainer 1
07 and a piping section for installing the same are easily detachable. Therefore, the strainer integrated type flow meter 1
Are connected to the piping section where the strainer 107 is installed.
6 can be easily installed by substantially the same operation as in the prior art.

As described above, since the strainer-integrated flow meter 1 of the present invention can be installed in the piping portion where the strainer 107 is installed by substantially the same operation as the conventional one, the strainer 107 and the flow meter 108 are separately installed. As compared with the case of performing the above, unnecessary piping is unnecessary, and the piping path can be shortened.

After the strainer-integrated flow meter 1 is installed in the pipe line for supplying kerosene to the kerosene combustion device, the power button 59
When the power is supplied by pressing, and then the measurement button 60 is pressed, the electric circuit shown in FIG. 8 is closed. As a result, the electric resistance value of the temperature sensing element 47 changes in accordance with the flow rate of kerosene, and a voltage difference Va-Vb appears at points a and b of the bridge circuit 67, and V
The pulse signal formed in the / F conversion circuit 73 is counted by the counter 77, converted into a flow rate by the microcomputer 78, and the flow rate value is digitally displayed on the display unit.

In the flowmeter 1 with integrated strainer, a flowmeter section 4 is disposed immediately after the strainer section 3. In the strainer section 3, foreign substances such as dust and dirt contained in kerosene are removed, and the flow rate of this short flow is reduced. Since a small amount of foreign matter does not accumulate much between the roads and the foreign matter rarely enters, there is little possibility that the foreign matter enters the flow meter unit 4. Therefore, the kerosene adheres and accumulates on the O-ring of the sensor mounting portion to form a gap, and the kerosene leaks, or adheres and accumulates on the fin plate of the sensor, reducing the heat transfer area and changing the flow state. This does not reduce the flow rate measurement accuracy.

The strainer-integrated flow meter 1 has an exhaust hole 15 connected to the flow passage, and when the strainer-integrated flow meter 1 is installed, even if air remains in the flow passage, the exhaust gas is exhausted. Since it can be discharged from the hole 15, it does not stay as air bubbles in the upper part in the flow passage. Therefore, the air bubbles do not adhere to and stay on the fin plate of the sensor, change the heat transfer state, and do not lower the flow rate measurement accuracy.

Further, in the strainer-integrated flow meter 1, since the flow rate value is digitally displayed on the display unit 28, the operator can immediately recognize the flow rate of the kerosene. In this case, it is determined that the foreign matter has entered the nozzle of the burner and the discharge port is partially blocked, and the operation of removing the foreign matter from the nozzle can be immediately performed.

On the other hand, looking at the flow state of kerosene,
Inflow from the inflow side flow passage 7 into the filter member insertion cylindrical body 10,
After passing through the filter member 18 and the communication hole 22 of the filter member 9, the filter member 9 rises through the through hole 21 and flows into the vertical portion 8 a of the outflow-side flow passage 8. In this process, the turbulent flow of the kerosene is rectified and becomes substantially laminar when it flows into the vertical portion 8a of the outflow-side flow passage 8. Accordingly, the kerosene flows substantially uniformly in the vicinity of the fin plate 38 of the flow rate sensor 26, so that highly accurate flow rate measurement can be performed.

Further, when the fluid passes through the bent portion in the pipeline, a phenomenon that the flow separates from the inner wall surface at the bent portion and a vortex is generated is observed. However, in the flowmeter 1 with integrated strainer, the flow sensor 26 is connected to the vertical portion 8a of the outflow side flow passage 8.
Since the flow is separated from the inner wall surface, the flow rate is measured before the vortex is generated. In this respect, the flow rate measurement can be performed with high accuracy.

The strainer-integrated flow meter 101 shown in FIGS. 9 to 11 also shares the housing 102 and integrates the strainer section 103 and the flow meter section 104, but differs from the above embodiment. 1 is that the flow meter section 104 is formed in the left half of the housing 102.

Further, a sensor mounting portion 131 raised upward is formed in the left half of the housing 102.
A sensor insertion space 132 is defined above the sensor mounting portion 131, and sensor insertion holes 133 and 134 are formed from the sensor insertion space 132 toward the horizontal portion 108 b of the outflow-side flow passage 108. Also, the outflow side flow passage 10
8, the sensor insertion holes 133, 13 of the horizontal portion 108b.
Openings 135 and 136 are formed at positions corresponding to No. 4. The lid 125 is detachably attached to the upper end of the sensor mounting section 131.

The other structure of the strainer-integrated flow meter 101 is the same as that of the strainer-integrated flow meter 1, and the same elements are denoted by the same reference numerals. Therefore, the function and effect achieved are almost the same as those of the strainer-integrated flow meter 1.

However, in the strainer-integrated flow meter 101, the flow of kerosene, which is substantially laminar and uniform when flowing into the vertical portion 108a of the outflow side flow passage 108, is transferred from the vertical portion 108a to the horizontal portion 108b. At the bent part, it separates from the inner wall surface, where a vortex is generated. In the strainer-integrated flow meter 101, since the flow sensor 26 is disposed in the horizontal portion 108b of the outflow-side flow passage 108, the flow is separated from the inner wall surface and the flow is measured after the vortex is generated. In this respect, the accuracy is slightly lower than that of the strainer-integrated flowmeter 1.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of one embodiment of a strainer-integrated flow meter of the present invention.

FIG. 2 is a side view of one embodiment of the strainer-integrated flow meter of the present invention.

FIG. 3 is an exploded longitudinal sectional view of one embodiment of the strainer-integrated flow meter of the present invention.

FIG. 4A is a front sectional view and FIG. 4B is a side sectional view of the flow sensor.

FIG. 5 is an exploded perspective view of a flow detection unit of the flow sensor.

FIG. 6 is a vertical cross-sectional view of a flow detection unit of the flow sensor.

FIG. 7 is an explanatory view showing a manufacturing process of the flow sensor.

FIG. 8 is an electric circuit diagram of the strainer-integrated flow meter of the present invention.

FIG. 9 is a longitudinal sectional view of another embodiment of the strainer-integrated flow meter of the present invention.

FIG. 10 is a plan view of another embodiment of the strainer-integrated flow meter of the present invention.

FIG. 11 is an exploded longitudinal sectional view of another embodiment of the strainer-integrated flow meter of the present invention.

FIG. 12 is a schematic configuration diagram showing a process of supplying kerosene from a tank, burning kerosene with a burner, and discharging combustion gas from a chimney.

FIG. 13A is a partially cut perspective view of a boiler, and FIG.
FIG. 3 is a partially cut perspective view of a burner.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Strainer integrated type flowmeter 2 Housing 3 Strainer part 4 Flowmeter part 7 Inflow side flow path 8 Outflow side flow path 9 Filtration member 10 Filtration member insertion cylinder 26 Flow rate sensor 27 Temperature sensor 28 Display part 29 Operation part 30 Circuit board 37 Flow rate detector 38 Fin plate 39 Output terminal 40 Coating member 41 Substrate 43 Heating element 47 Temperature sensing element 67 Bridge circuit 73 V / F conversion circuit 77 Counter 78 Microcomputer

[Procedure amendment]

[Submission date] August 25, 1998 (1998.8.2
5)

[Procedure amendment 1]

[Document name to be amended] Drawing

[Correction target item name] All figures

[Correction method] Change

[Correction contents]

FIG.

FIG. 2

FIG. 4

FIG. 5

FIG. 6

FIG. 3

FIG. 7

FIG. 9

FIG. 13

FIG. 8

FIG. 10

FIG. 11

FIG.

 ────────────────────────────────────────────────── ─── Continuing from the front page (72) Inventor Kenichi Hiraizumi 1333-2 Hara-shi, Ageo-shi, Saitama Mitsui Mining & Mining Co., Ltd. F-term (reference) 2F035 AA06

Claims (8)

[Claims] 1. A strainer comprising a housing having a flow passage, a filter member and a filter member insertion cylinder, a housing having a flow passage, and a flow meter having a flow sensor. A flowmeter integrated with a strainer, wherein the housing of the flowmeter section is shared and integrated, and the flowmeter section is arranged downstream in the flow direction of the fluid. 2. The strainer-integrated flowmeter according to claim 1, wherein an exhaust hole is formed in the housing so as to be connected to the flow passage. 3. The flow meter section has a display section for displaying a flow value, an operation section for supplying power and measuring the flow rate, and an electric section for displaying the flow rate detected by the flow sensor on the display section. 2. The circuit according to claim 1, further comprising a circuit.
Or the strainer-integrated flowmeter according to 2. 4. A flow rate sensor comprising: a flow rate detection unit having a heating element and a temperature sensing element formed on a substrate; a fin plate for transferring heat between a fluid to be detected; and a voltage value corresponding to the flow rate. 4. An output terminal for outputting, wherein the flow rate detection unit, a part of the fin plate, and a part of the output terminal are covered by molding.
The strainer-integrated flowmeter described in 1. 5. The flow meter unit according to claim 1, further comprising a temperature sensor for detecting a temperature of the fluid.
The strainer-integrated flowmeter described in 1. 6. The temperature sensor, wherein the temperature sensor has a temperature sensing portion formed on a substrate, a fin plate for transferring heat between the fluid to be detected, and an output terminal for outputting a voltage value corresponding to the temperature. The strainer-integrated flow meter according to claim 5, wherein the flow rate meter includes a temperature detector, a part of the fin plate, and a part of the output terminal covered by molding. 7. The electric circuit includes a temperature sensing element of the flow rate sensor and a temperature sensing element of the temperature sensor, and has a bridge circuit that outputs a voltage difference corresponding to the flow rate of the fluid. 7. The strainer-integrated flow meter according to 3 to 6. 8. The V / F for converting a voltage difference corresponding to a flow rate of a fluid into a pulse signal having a corresponding frequency.
A conversion circuit, a counter for counting this pulse signal,
The strainer-integrated flowmeter according to claim 7, further comprising a microcomputer that converts the flow rate into a flow rate corresponding to the frequency.