JPS5871415A - Flowmeter for liquid - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is a liquid flowmeter equipped with a rotor that is driven in a predetermined rotational direction by a flowing liquid, the rotor being supported within a casing of the flowmeter, The rotational speed of the rotor can be detected by a measuring device, and the flow is deflected by 90° in the meridian section in the rotor.

From U.S. Patent No. 3,867,840,
Liquid metering devices are known in which the liquid to be measured flows tangentially into a rotor chamber and exits the rotor chamber again through an axial opening. A rotor with an impeller is rotatably arranged in the chamber, the rotor blades being loaded by the inflowing liquid and causing the rotor to rotate. The rotation of the rotor is measured by an electro-optical evaluation device and in this way the flow rate of the liquid is detected. However, said meters have the disadvantage that even if the liquid flow has already been interrupted, the rotor is forced to rotate still further by its inertial forces as well as by the liquid circulating in the rotor chamber. Furthermore, the liquid to be measured flows past the rotor blades into the outflow chamber, so that the accuracy is not sufficient, especially at low flow rates.

In another known flow meter, the rotor is arranged directly in the flow path (German Patent No. 29.1182
Specification No. 6). The drum-shaped mouthpiece has a lip extending helically around its circumference. In front of the rotor, an upstream axial lip is arranged in the flow passage, which lip directs the liquid flow in the same direction and guides it in axial flow relative to the rotor. The liquid flowing cleanly to the outside of the rotor comes into contact with a spirally extending rotor lip, thereby causing the rotor to rotate.

This flow meter also has the disadvantage that the liquid to be measured flows past the rotary lip, so that very accurate measurement results cannot be obtained for small flow rates. Furthermore, in this case as well, the free-wheeling rotor when the liquid flow is interrupted will result in inaccurate flow measurements.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to detect as accurately as possible even very small flow rates, such as those that occur during no-load operation with respect to the fuel consumption of an internal combustion engine, in a flow meter for liquids, and to detect the rotor's inertia when the liquid flow is interrupted. The purpose is to stop force rotation.

In order to solve this problem, the invention provides that the rotor, seen in the direction of flow, is preceded by a flow duct and rearwardly provided with an outflow chamber surrounding the rotor, and furthermore, the liquid flows in the region of the rotor axis. The fluid flows into the rotor through the flow passage and flows out again in the circumferential direction through an outlet provided on the outer peripheral surface of the rotor.

The flow meter for liquids according to the invention is only capable of being measured by the reaction force of the outflowing liquid if the liquid to be measured flows through the rotor from the inside to the outside, resulting in an outflow of the liquid along the outer circumferential surface of the rotor. It has the advantage that the rotor is rotated. Small amounts of liquid are also desired, since even if a small amount of liquid flows through, it has to flow out of the rotor opening, which causes a reaction force to act on the rotor. It can be measured with an accuracy of In this case, a corresponding optoelectric or electromagnetic detection of the rotor movement can be applied to determine the instantaneous fuel consumption in the motor vehicle as well as to detect the amount of fuel consumed. Another advantage is that the liquid that escaping the rotor in the outflow chamber rotates at least partially in an opposite direction to the rotor, thereby braking the rotor during free-wheeling.

It is particularly advantageous if the disk-shaped rotor has two rotating blades extending from the region of the rotor axis to the outlet, the rotating blades extending outward in a helical manner. In this way, vortex formation and vaporization of the liquid within the rotor and within the rotor chamber may be prevented. In order to produce liquid flows directed in the same direction in the flow channel in front of the rotor, the rotor is preferably fixed on a shaft that is supported in the flow channel. The guide groove is arranged on the inner wall of the flow channel. In this embodiment, it is particularly advantageous if the inner edges of the rotary vanes are chamfered obliquely towards the flow channel in order to brake the rotor during free-wheeling.

A particularly advantageous configuration of the flow meter according to the invention is obtained in a conduit system in which only a part of the delivered liquid is consumed and the remainder returns via a second conduit. In this case, a second rotor is provided, located on the same rotor axis and in a second outflow chamber, with a second flow path for the unconsumed returning liquid, said rotor having an opposite direction of rotation. I can do what I do.

Furthermore, in the case of a flow meter according to an embodiment of the invention, an adjustable detour to the rotor allows the rotational speed of the rotor or the number of emitted pulses to be predetermined in an advantageous form for a given flow rate. It is possible to calibrate to the value. For this purpose, the inflow chamber bypasses the rotor and communicates with the outflow chamber via a calibration passage, and the cross section of the calibration passage can be adjusted by a throttle.

The invention will now be explained in detail with reference to the illustrated embodiments.

In FIG. 1, a flow meter in the fuel line of an internal combustion engine is designated by the reference numeral 10. The fuel is delivered by a fuel pump (not shown) and flows through a flow meter 10. The direction of fuel flow is indicated by arrows. The fuel flows from the inlet chamber 11 through the inlet 12 into the flow passage 13,
From here it passes through the rotor 14 into the outlet chamber 15 and finally via the outlet 16 into the outlet channel 17 . The inflow chamber 11 is connected to a non-cogged inlet conduit and the outflow passage 17
are each connected to an outlet conduit. The rotor 14 is fixed on a rotor shaft 18, which is supported with its lower end in the flow channel 13. For this purpose, a bearing 20 is mounted in the lower casing part 19 of the flow meter 10. The upper casing part 21 closes the outflow chamber 15 towards the top. This casing part 21 has a second bearing 2 for the upper end of the rotor shaft 18.
I support 2. In order to stir the axial flow of fuel directed in the same direction within the flow passage 13, six guide lips 23 extending in the axial direction of the rotor 14 are arranged on the walls of the flow passage. , the guide lips are evenly distributed around the circumference of the flow channel.

A second diagram showing a cross-sectional view of the flowmeter along the line n-n of Figure 1.
As can be seen, the rotor 14 arranged above the flow passage 13 is concentrically surrounded by an outflow chamber 15 . The fuel flowing upward in the flow channel 13 flows from the flow channel 13 into the rotor 14 in the region of the rotor axis. 2 provided on the outer circumferential surface of the disc-shaped rotor 14
- Through the two outlets 24 the fuel flows out again in the circumferential direction of the rotor 14 and thus reaches the outlet chamber 15. Rotor 1
The outlet openings 24 of 4 extend substantially tangentially. These outlets are located opposite each other on the outer peripheral surface of the rotor 14 and extend in the same circumferential direction. The rotor 14 extends internally from the region of the rotor axis to the outlet 24 . A rotating blade 25 is provided, and the rotating blade extends outward from the inside in the shape of a logarithmic line.

This shape of the rotating vanes reduces the flow resistance and avoids the formation of swirls in the flowing fuel.

As shown in FIG. 3, the rotor 14 is fixed on the rotor shaft 1B with a boss 26, and the rotor shaft projects into the flow passage 13 from above. The guide lip 23 in the flow channel 13 is arranged around said area of the rotor boss 26 .

Immediately above this, the inner end of the rotating blade 25 in the rotor 14 is located. The rotary vanes are chamfered obliquely toward the flow passage 13 at the inner edge 25a in order to brake the rotor 14 during no-load operation. Rotor 14
is covered on its lower side by a plate 27 which has laminar projections 2 evenly distributed on its circumference.
It has B. This projection cooperates with an opto-electrical signal emitter 29 left, which is mounted at the bottom of the outflow chamber 15 and converts the movement of the rotor 14 into electrical pulses.

The inflow chamber 11 connects to the outflow chamber 1 via a calibration passage 9 in a front region 11a provided for compensating pressure fluctuations.
5, the calibration passage forms a detour to the rotor 14. The calibration passage 9 has a slit 8 toward the outflow chamber 15, and the slit is connected to the outflow chamber 1.
It has a length of about 2 frames and a width of 0.2 mm when viewed in the circumferential direction of 5. The slit 8 is aperture 7 at the wall of the outflow chamber 15.
The diaphragm can be covered by the casing part 21
It is integrally molded into.

The mode of operation of the flowmeter 10 will be explained in detail below with reference to FIGS. 1 to 6. As soon as the fuel is delivered, it flows through the inlet 12 into the flow passage 13 in the direction of the arrow.

The fuel is now directed in the same direction by the guiding reso 23,
As a result, the fuel rises in the axial direction of the rotor and towards the inside of the flow passage 13. At the upper end of the flow channel 13, the fuel flows into the rotor 14 in the region of the rotor axis, flows along the rotating blades 25 and exits again along the outside of the rotor 14 through the outlet 24. At this time, the fuel exerts a force on the guide vanes 25, and this force causes the rotor 14 to rotate. At the outlet 24 of the rotor 14,
The fuel now flows in the circumferential direction of the outlet chamber 15, whereas the rotor 14 rotates in the opposite circumferential direction. After passing through the outlet 16, the fuel finally flows from the outlet chamber 15 to the outlet passage 1.
7 and from there into the fuel conduit. Depending on the sending amount,
Therefore, the port 14 rotates rapidly depending on the amount of fuel. The opto-electrical signal transmitter 29 in this case emits electrical pulses together with each projection 28 on the rotazolate 17 that moves past it. From the pulse frequency, the instantaneous fuel consumption of the internal combustion engine can be detected and indicated, and from the summation of the pulses, the amount of fuel consumed and thus also the amount of fuel that is still present can be detected and indicated.

The pulse frequency is set such that even in flowmeters that are at the limits of manufacturing tolerance, the number of pulses is too high if the calibration passage 9 is completely closed. Outflow chamber 15
A cover-like casing part 21 that closes upward.
As a result, the diaphragm 7 is now pivoted until it partially closes the slit 8 of the calibration channel 9. Only a small amount of fuel can now bypass the rotor 14 and reach the outlet chamber 15 . This causes the rotor speed to decrease for a constant flow rate. The number of pulses given in advance for calibration of the flowmeter 10 can be adjusted by rotating the casing 21 to cover the syslit 8 more or less widely.

Additionally, if gas or vapor bubbles in the fuel reach the rotor 14, the measurement results may be adversely affected.

However, if the calibration channel 9 is arranged in the upper region of the inflow chamber 11 or region 11a, and if the diaphragm sifter leaves the smallest cross section of the slit open,
The aforementioned drawbacks are avoided.

Such flowmeters are suitable, for example, for minimum flow rates of up to 0.5 liters per unit time for no-load operation of an internal combustion engine, as well as for large quantities of up to 100 liters per unit time for full-load operation of the engine. Can be measured with precision. Of particular importance with regard to accuracy is that the rotor undergoes as little freewheeling as possible during a sudden force cutoff of the fuel delivery. In the embodiment shown in FIGS. 1 to 3, this is caused, on the one hand, by the external shape of the rotor 14 and the shape of the outflow chamber 15. because,
The fuel in the outflow chamber 15 rotates along the circumferential surface of the rotor 14 in the opposite direction to the rotor, brakes the rotor due to flow resistance, and finally flows out from the outflow chamber 15 above the rotor 14. It is. Furthermore, the rotor 14 is braked at the backside of the rotor by the protrusion 28 rotating in the fuel. Furthermore, the rotor 14 is also braked by the inclined inner edge portion 25a of the inner end portion of the rotary blade 25 causing the fuel in this range to swirl around the rotor axis when the rotor 14 rotates under no load. The swirl continues downstream in the flow channel 13 and is braked there by the guide lip 23.

I can't stand it. In this way, kinetic energy is removed from the rotor 14 or the rotor is forced to brake, especially if the fuel flow rate decreases rapidly.

FIG. 4 shows a flow meter 30 in another embodiment of the invention, in which the rotor 31 is formed from a T-shaped tube section, the mutually remote ends of which are each closed. It is being

A rotor 31, shown in perspective view in FIG. 5, is fixed on a rotor shaft 32, which is supported on the one hand in an inlet chamber 33 and on the other hand in an outlet chamber 34. In the embodiment shown, the flow passage 35 is formed by a tube extension 35a surrounding the rotor shaft 32, in which the fuel rises axially to a high force. The fuel is then divided into tube sections 31a, each of which is provided in its mutually remote end regions with an outlet 36 extending tangentially to the rotor axis. The fuel flows out from the two outlet ports, and the reaction force causes the rotor 31 to rotate in the direction of the arrow (FIG. 5) inside the outlet chamber 34.

The rotation of the rotor 31 is detected by the opto-electrical signal transmitter 3T and converted into an electrical signal indicative of the flow rate. The inflow chamber 33 of the flow meter 30 is connected to the inflow conduit 3
8 and the outflow chambers 34 are each connected to an outflow conduit 39 .

Due to the relatively simple structure of the rotor 31, there is insufficient braking force when the fuel delivery is rapidly shut off. However, such a flow meter can be used in a very advantageous manner whenever liquid is delivered to a consumer in a delivery conduit and the liquid that is not consumed here flows back again via a return conduit. As shown in a further embodiment in FIG. 6, in this case a second rotor 40 is arranged on the same rotor shaft 32a and in a second outflow chamber 41. Via the inlet conduit 42, the returning unconsumed liquid is conducted through the inlet chamber 43, the flow passage 44 and into the rotor 40. Through the outlet the liquid then flows into the outlet chamber 41 and from there to the outlet conduit 46 . The outlet 45 provided at the end of the pipe section of the second rotor 40 is connected to the outlet 36 of the first rotor 31.
They are arranged in opposite circumferential directions. This causes the rotor 40 to act in the opposite direction of rotation relative to the rotor 31 arranged below it as the liquid flows past. Since the two rotors 31 and 40 are fixed and mounted on the same rotor shaft 32a, opposite rotational moments act on both rotors, and in this case, in the entire system, there is a difference between the total delivery amount and the return amount. Since the difference acts as a resultant force, the two rotors 31 and 40 rotate in the direction of rotation of the lower rotor 31. As soon as no more fuel is consumed by the internal combustion engine, the output and return quantities become equal in magnitude.

The two rotational moments in rotors 31 and 40 are eliminated and the system stops.

Identification of the direction of rotation is not necessary in the case of opto-electrical signal transmitters 29 and 37. This is because the flowmeter rotor stops when the direction of liquid flow is reversed.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of a flowmeter according to the present invention having a disc-shaped rotor, FIG. 2 is a cross-sectional view of the flowmeter taken along line nn in FIG. 1, and FIG. 4 is a sectional view of a flowmeter according to another exemplary embodiment with a figure-7 tube section as the rotor; FIG. 5 is a perspective view of the rotor of FIG. 4; and FIG. FIG. 6 shows a flow meter according to another embodiment with rotors acting in opposite directions on the same rotor axis; 7... Aperture, 8... Slit, 9... Calibration passage,
10.30...flow meter, 11,33.43...two inflow chambers, 11a...range, 12...inlet, 13,3
5゜44...Flow passageway, 14.31.40...Rotor, 15.34.41...Outflow chamber, 16.24,3
6゜45... Outlet, 17... Outflow passage, 18,3
2゜32a...o - Evening shaft, 19.27...Casing part, 20.22...Bearing, 23-...Guiding rib, 25...Rotating blade, 25a...Inner edge part, 26
... boss, 27 ... solate, 28 ... protrusion,
29.37...Signal transmitter, 31a...Pipe section, 3
5a... Pipe addition part, 38.42... Inflow conduit, 39
．． 46... Continuation of outflow conduit page 1 Priority claim @ June 9, 1982 ■ West Germany (DE)
■P3221775.7 0 Inventor Beter Hercht Federal Republic of Germany Ludwigshafen Richartov Agner Strasse 28 RF Review 1983-71415 (8) 94-

Claims (1)

[Scope of Claims] 1. A liquid flowmeter equipped with a rotor that is driven in a predetermined rotational direction by flowing liquid, the rotor being supported within a casing of the flowmeter, and the rotational speed of the rotor being In a rotor which can be detected by a measuring device and in which the flow is deflected by 90° in the meridian section, the rotor (1
4, 31, 40) are provided with flow passages (13, 35, 44) and an outflow chamber (15, 3) surrounding the rotor.
4, 41) is placed after the rotor shaft (
18, 32) flows into the rotor from the flow passage,
In addition, the outflow ports (24, 36,
A flowmeter for liquid, characterized in that the liquid flows out again in the circumferential direction through 45). 2. The rotor (14, 31, 40) has two outlet ports (24, 26, 45) on its outer circumferential surface that are opposed to each other and extend in the same circumferential direction. 1
Flowmeter described in section. 6. Flowmeter according to claim 2, wherein the outlet (24, 36, 45) extends substantially tangentially. 4. The rotor (14) is configured in a disc shape,
4. Flowmeter according to claim 3, further comprising rotary vanes (25) guided from the region of the rotor axis to the outlet opening (24). 5. A flowmeter according to claim 4, wherein the rotary vanes (25) extend outward in a helical manner. 6. The rotor (14) is fixed on the rotor shaft (1B) with a boss (26) that reaches into the flow passage (13), and the rotor (14) is fixed on the rotor shaft (1B) with one end thereof Passage (13>
2. A flowmeter according to claim 1, wherein the flowmeter is rotatably mounted within and with its other end in the outflow chamber (15). 1. The flowmeter according to claim 6, wherein a plurality of guide grooves (23) extending in the axial direction of the rotor (14) are arranged on the inner wall of the flow passage (13). 8. The flowmeter according to claim 7, wherein the inner edge (25&) of the rotary vane (25) is chamfered diagonally toward the flow passage (13). 9. The liquid flowing out from the outlet (24) flows into the outlet chamber (15).
3. Flow meter according to claim 2, wherein the flow meter rotates in a direction opposite to the rotor (14) within the rotor (14) and is adapted to flow out of the flow chamber above the rotor. 10. The rotor (31, 40) has a T-shaped tube section (3
1a), wherein the mutually remote ends of the tube sections are each closed and each provided with a through outlet (36, 45) extending tangentially to the rotor axis. Flowmeter according to claim 1. 11. A second rotor (40
) is provided in the second outflow chamber (41) and with a second flow path (44) for the unconsumed liquid flowing back, and the rotor is connected to the first rotor ( 31) The flow meter according to claim 1, wherein the flow meter operates in a direction of rotation opposite to that of the flow meter according to claim 1. 12. The outlet (45) of the second rotor (40) is
12. The flowmeter according to claim 11, wherein the flowmeter is located in a circumferential direction opposite to the outlet of the first rotor (31). 13. The inflow chamber (1'1) bypasses the rotor (14) and communicates with the outflow chamber (15) via the calibration passage (9), in which case the calibration passage (9) has a cross-sectional area 2. A flowmeter as claimed in claim 1, wherein the flowmeter is adjustable. 14. The calibration channel (9) has a slit (18) towards the outflow chamber (15), and the slit can be covered by a pivotable diaphragm (7). The flowmeter according to item 13. 15. The aperture (7) is integrally formed with a casing part (21) that closes the outflow chamber (15) upwardly, and the aperture (7) is rotated together with the casing part.
15. The flowmeter according to claim 14, wherein the slit (8) of the calibration passage (9) is covered more or less widely. 16, said calibration passage (9) to derive gas bubbles;
is arranged in the upper region of the inlet chamber (11,'11a), and the throttle (7) keeps the flow rate cross section of the slit (8) open. Total.