JP2002255295A - Pump unit integrated with flow meter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pump unit integrated with flow meter wherein the appliance is made compact, and the incorporating into an oil feeding device is facilitated, and also, the channel shape to the flow meter is fixed, and the correction of an instrumental error is facilitated. SOLUTION: For this flow meter integrated type pump unit (1), a pump (6) and the flow meter (9) are incorporated in a casing (19). In such a flow meter integrated type pump unit (1), a channel which connects the pump (6) and the flow meter (9) is formed on the casing (19). In this case, an air separator and a strainer (8) on the discharging side are provided on the channel. Then, a control valve (10) is provided on the discharging side of the flow meter (9).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flow meter-integrated pump unit incorporated in a fueling device for supplying liquid fuel such as gasoline to an automobile.

[0002]

2. Description of the Related Art As shown in FIG. 7, a fuel supply device 30 for supplying fuel oil such as gasoline to an automobile has a housing 31 in which a pump unit 32 and a flow meter 33 are incorporated. The pipe 34 connected to the suction port of the pump unit 32 is connected to an oil storage tank (not shown), the discharge port of the pump unit 32 is connected to the inflow port of the flow meter 33 via the pipe 35, and the discharge port of the flow meter 33 is connected. Piping 36 connected to the outlet
Is connected to a refueling hose 38 to which a refueling nozzle 37 is attached at the end.

The pump unit 32 is provided with a suction side strainer, a check valve, a gear pump, an air separator, a discharge side strainer, a bypass valve, a float chamber, a float valve and the like.

The pump unit 32 is driven by a motor 39, a flow meter 33 is provided with a flow rate pulse transmitter 40, and a nozzle hook 41 for hooking a refueling nozzle 37 is provided with a nozzle switch 42. And the motor 39,
The flow rate pulse transmitter 40 and the nozzle switch 42 are connected to a control device 43, and an indicator 44 for displaying the amount of refueling calculated by the control device 43 is provided.

As described above, the housing 31 of the oil supply device 30
In order to store various kinds of devices inside, there is a demand for making each device compact. In addition, the shape of the pipe 35 connected to the inflow port of the flow meter 33 varies depending on the lubricating device, and the instrument difference of the flow meter 33 is inconsistent, making it difficult to compensate for the difficult instrument difference.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above, and it has been made possible to make a device compact and easy to assemble into a lubricating apparatus, and to fix a flow path shape to a flow meter to correct an instrumental error. It is an object of the present invention to provide a pump unit integrated with a flow meter, which can facilitate the above.

[0007]

According to the present invention, there is provided a pump unit incorporating a flow meter, wherein the pump and the flow meter are incorporated in a casing. Is formed in a casing, an air separator and a discharge side strainer are provided in the flow path, and a control valve is provided on the discharge side of the flow meter (claim 1).

According to the present invention having such a configuration, since the shape of the pipe (the pipe formed inside the pump casing) is always the same, once the instrumental difference correction coefficient is set, the following steps are required. In addition, the instrument difference correction coefficient setting work becomes unnecessary. Therefore, the user is freed from complicated instrument difference correction coefficient setting work, and the labor spent on maintenance and the like is reduced.

In the practice of the present invention, the flow meter is
It is preferable that it is a rotary type constituted by a plurality of rotors (claim 2). By making the flow meter a rotary type constituted by two rotors, it is possible to prevent a pulsating flow with a small size. And the weighing accuracy is improved.

The casing has a rotor chamber for accommodating the rotor of the flow meter, the rotor chamber has a recess, and the lid of the rotor chamber has a projection fitted into the recess. Is preferable (claim 3). By employing such a configuration, the positioning of the rotor shaft is accurate and easy, the jamming of the rotor (jamming) can be prevented, and the wear of the rotor can be reduced.

Further, it is preferable that a flow pulse transmitter for outputting a flow signal of the flow meter is provided on a lid of the rotor chamber of the flow meter. If the flow rate pulse transmitter is provided on the lid of the rotor chamber of the flow meter, it is possible to prevent unauthorized operation on the flow meter by sealing the lid of the rotor chamber.

In the present invention, it is preferable that the discharge side strainer has a cylindrical shape and a fin-shaped filter is used (claim 5). By using such a discharge-side strainer and filter, the flow is rectified, the vortex is reduced, and the metering accuracy of the flow meter is improved.

In addition, it is preferable that the control valve is provided with a pressure increasing means. By providing the control valve with the pressure increasing means, the pressure on the inflow side at the time of a low flow rate is suitably maintained, and the air separation performance of the air separator and the measurement accuracy of the flow meter can be further improved.

[0014]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a pump unit integrated with a flow meter according to the present invention.

FIG. 1 is a block diagram showing equipment incorporated in a flow meter-integrated pump unit of the present invention. The inflow port 2 of a flow meter-integrated pump unit 1 is not shown via a pipe 3. Connected to oil storage tank. The inflow port 2 is connected to a pump 6 via a suction side strainer 4 and a check valve 5.

The pump 6 is connected to a flow meter 9 via an air separator 7 and a discharge-side strainer 8, and the flow meter 9 is connected to a discharge port 11 of a pump unit 1 integrated with a flow meter via a control valve 10. , The discharge port 11 is a pipe 12
Is connected to a refueling nozzle (not shown).

The discharge port and the suction port of the pump 6 are connected by a bypass 13, and the bypass 13 is provided with a bypass valve 14. The air-containing fuel oil flowing out of the air separator 7 flows through the flow chamber 15 through the float chamber 1.
6, the fuel oil is returned to the inflow side of the pump 6 via the flow path 17, and the air is discharged to the atmosphere via the float valve 18.

Next, the structure of a pump unit integrated with a flow meter according to the present invention will be described with reference to FIGS.

As shown in FIG. 2, an inlet 2 is formed in a casing 19 of the pump unit 1 integrated with a flow meter.
The inflow port 2 is connected to an oil storage tank via a pipe (not shown). The inflow port 2 is connected to a suction port of a pump 6 via a suction-side strainer 4 and a check valve 5. It should be noted that the check valve 5 and the suction side strainer 4 may be arranged reversely as required.

The intake side strainer 4 removes dust in the fuel oil, and the check valve 5 prevents the fuel oil from flowing backward and replacing the fuel oil in the casing 19 with air. The pump 6 is a gear pump that has a strong suction force and has few failures.

As shown in FIG. 3, the discharge port 6a of the pump 6
Is connected to the air separator 7, and the flow path of the air separator 7 is turned back at the discharge-side strainer 8 and connected to the flow meter 9.

As described above, the flow path connecting the pump 6 and the flow meter 9 is formed in the casing 19 and the flow path is turned back. The rigidity of the flowmeter is increased, the noise is reduced by reducing the area, and the vibration of the flowmeter can be reduced by reducing the springback. In addition, since the flow path can be shortened and the volume can be reduced, the amplitude of the pressure wave due to cavitation can be reduced, and the amount of replacement can be reduced when liquid replacement occurs.

The air separator 7 removes air from the fuel oil and ensures the measurement accuracy of the flow meter 9. As this air separator 7, a small and high-performance
A so-called cyclone air separator is suitably used. The cyclone air separator separates gas and liquid by centrifugal force.

The fuel oil flowing from the discharge port 6a of the pump 6 in the tangential direction of the cylindrical path 7a of the air separator 7 turns at a high speed in the cylindrical path 7a and collects at the center of the cylindrical path 7a. Flows into the float chamber 16 through the flow path 15. The air-containing fuel oil is separated into air and fuel oil in the float chamber 16, and the fuel oil is supplied to the pump 6 through a flow path 17.
The air is returned to the atmosphere through the float valve 18. Then, the fuel oil containing no air flows from the distal end of the cylindrical path 7a to the discharge-side strainer 8.

As shown in FIG. 4, the discharge-side strainer 8
The filter 8a is formed in a fin shape, the filter 8a is formed in a cylindrical shape, and both ends of the cylindrical filter 8a are fixed by two donut-shaped holding plates 8b.

The discharge-side strainer 8 removes fine dust in the fuel oil to prevent the accuracy of the flow meter 9 from being reduced and to be broken by the dust, and to rectify the vortex flowing from the air separator 7. Since the flow is rectified and flows to the flow meter 9 in this way, even if the straight pipe portion at the inflow port of the flow meter is short, the measurement accuracy can be secured and the size can be reduced.

The flow meter 9 has two rotors 9a combined.
A so-called lobe type flow meter is preferably used. The lobe type flow meter is a small, high-precision positive displacement type flow meter which does not generate pulsation.

As shown in FIGS. 5 and 6, a screw hole 9d for fixing a lid 9c and a concave portion 9e for positioning are formed in a rotor chamber 9b for accommodating a rotor 9a of the flow meter 9.
The lid 9c is provided with a bearing 9g into which the shaft 9f of the rotor 9a is inserted, a projection 9h inserted into the recess 9e, and a bolt hole 9i. Then, the protrusion 9h provided on the lid 9c is inserted into the recess 9e of the rotor chamber 9b, and the rotor 9a
Is inserted into the bearing 9g, and the bolt 9j is inserted into the screw hole 9g.
The cover 9c is fixed by screwing to d.

As described above, the cover 9 is formed by the projection 9h and the recess 9e.
Since c is fixed at the fixed position, the shaft 9f of the rotor 9a is accurately fixed, the flowmeter 9 is assembled with high accuracy, and jamming (jamming) of the rotor does not occur.

The flow pulse transmitter 20 of the flow meter 9 is composed of a magnet 9k provided on a shaft 9f of the flow meter 9 and a magnetic sensor 20a for detecting the magnetism of the magnet 9k and outputting a flow signal, that is, a so-called MR sensor. Have been. The lid 20b of the flow pulse transmitter 20 is sealed 20c. By sealing the lid 20b in this manner, fraud such as changing the conversion rate of the flow rate pulse transmitter 20 can be prevented.

When the shaft 9f of the flow meter 9 rotates and the magnet 9k rotates, the rotation of the magnet 9k is detected by the magnetic sensor 20a.
Is detected, and the flow rate signal is output to a control device (not shown) via the signal line 20d.

As shown in FIG. 3, the discharge port of the flow meter 9 is connected to a discharge port 11 via a control valve 10, and the discharge port 11 is connected to a refueling nozzle via a pipe (not shown).

The control valve 10 comprises a valve element 10a and a spring 10c for urging the valve element 10a to close the valve seat 10b. The valve element 10a is provided with a flange 10d as a pressure raising means.

The control valve 10 is for maintaining a high pressure on the inflow side at a low flow rate. By keeping the pressure high in this way, the air separation performance of the air separator 7 is improved, and the measurement accuracy of the flow meter 9 is improved.

Since the valve body 10a is provided with a flange 10d as a pressure raising means, the pressure on the inflow side is suitably maintained, and the air separation performance of the air separator 7 and the measurement accuracy of the flow meter 9 are further improved. Can be done.

The valve body 10a is provided with a relief valve 21. The relief valve 21 includes a valve element 21a,
The spring 21c is configured to bias the valve body 21a toward the valve seat 21b.

The relief valve 21 is used to return the fuel oil to the inside of the casing 19 when the pressure on the discharge port 11 side is increased, and to prevent damage to the piping and equipment on the discharge port 11 side due to the pressure.

The illustrated embodiment is merely an example,
It should be noted that this is not intended to limit the technical scope of the present invention.

[0039]

The effects of the present invention are listed below. (1) Since each device such as a flow meter and a pump is housed integrally in the casing, a weighing machine in which the devices are incorporated can be reduced in size. (2) Since the flow path connecting each device is formed in the casing, the flow line flowing into the flow meter is fixed, the measurement accuracy is stabilized, and the instrumental difference can be set uniformly. (3) Since the flow path of the air separator and the pump is folded back, it suppresses and suppresses relatively high frequency pressure vibration, increases the rigidity of the pipeline, reduces noise by reducing the area, and reduces springback. It is possible to reduce the vibration of the flow meter by reducing the number. (4) Since the flow path can be shortened and the volume can be reduced, the amplitude of the pressure wave due to cavitation can be reduced, and the amount of replacement can be reduced when liquid replacement occurs. (5) Since the flowmeter is a positive displacement type flowmeter combining two rotors, it is small, high-precision and free from pulsation. (6) Since the shaft of the rotor of the flow meter is provided on the lid and the lid is positioned by the concave and convex portions, the shaft of the rotor is secured at a fixed position, and the rotor does not jam (jamming). (7) Since the flow pulse transmitter is provided on the lid of the rotor chamber of the flow meter, by sealing the lid of the flow pulse transmitter, it is possible to prevent fraudulent modification of the flow pulse transmitter. (8) Since the discharge side strainer has a rectifying function,
Even if the straight pipe portion at the inlet of the flow meter is short, the measurement accuracy can be secured and the size can be reduced. (9) Since the control valve is provided with the pressure increasing means, the pressure on the inflow side is suitably maintained, and the air separation performance of the air separator and the measurement accuracy of the flow meter can be further improved.

[Brief description of the drawings]

FIG. 1 is a block diagram of a flow meter-integrated pump unit of the present invention.

FIG. 2 is a cross-sectional view of a pump unit integrated with a flow meter according to the present invention.

FIG. 3 is a sectional view taken along line AA of FIG. 2;

FIG. 4 is a perspective view of a discharge-side strainer.

FIG. 5 is a front view of a flow meter part with a lid removed.

FIG. 6 is a sectional view of a flow meter and a pulse transmitter.

FIG. 7 is a front view of a weighing machine incorporating a conventional device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Pump unit integrated with flowmeter 2 ... Inflow port 3 ... Piping 4 ... Strainer on suction side 5 ... Check valve 6 ... Pump 7 ... Air separator 8 ... Discharge side strainer 9 ・ ・ ・ Flow meter 10 ・ ・ ・ Control valve 11 ・ ・ ・ Discharge port 12 ・ ・ ・ Piping 13 ・ ・ ・ Bypass path 14 ・ ・ ・ Bypass valve 15, 17 ・ ・ ・ Flow path 16 ・ ・ ・Float chamber 18 Float valve 19 Casing 20 Flow pulse transmitter 21 Relief valve

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G01F 1/00 G01F 15/08 3/10 15/12 15/08 F04B 21/00 Z 15/12 21 / 06 B (72) Inventor Yoshio Yamazaki 2-12-13 Shibaura, Minato-ku, Tokyo Inside Tatsuno Mechatronics Co., Ltd. (72) Shoichi Fukumoto 2--12-13 Shibaura, Minato-ku, Tokyo Co., Ltd. F-term in Tatsuno Mechatronics (reference) 2F030 CA01 CC03 CD02 CF02 CF03 CF05 CF07 CF08 CF11 CG04 CG10 3E083 AA02 AC03 AE01 AE06 3H071 AA07 BB02 CC32 CC33 CC47 DD61 DD83 DD89

Claims (6)

[Claims] 1. A flow meter-integrated pump unit in which a pump and a flow meter are incorporated in a casing, a flow path connecting the pump and the flow meter is formed in the casing,
A flow meter-integrated pump unit, wherein an air separator and a discharge-side strainer are provided in the flow path, and a control valve is provided on the discharge side of the flow meter. 2. The pump unit integrated with a flow meter according to claim 1, wherein said flow meter is a rotary type constituted by two rotors. 3. A rotor chamber for accommodating a rotor of the flow meter is formed in the casing, a concave portion is formed in the rotor chamber, and a convex portion that fits into the concave portion is provided in a lid of the rotor chamber. The pump unit integrated with a flow meter according to claim 1. 4. A pump unit integrated with a flow meter according to claim 1, wherein a flow pulse transmitter for outputting a flow signal of the flow meter is provided on a lid of a rotor chamber of the flow meter. 5. The discharge side strainer has a cylindrical shape, and a fin-shaped filter is used.
5. A pump unit integrated with a flow meter according to any one of items 4 to 4. 6. A pump unit integrated with a flow meter according to claim 1, wherein said control valve is provided with a pressure increasing means.