JP2946855B2 - Flowmeter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flowmeter provided in a fueling device installed in a gas station.

[0002]

2. Description of the Related Art As is well known, a flow meter measures and sends out a liquid fed into a case by a fixed amount by a piston sliding in a cylinder. Conventionally, as shown in FIG. 3, a device for measuring an amount, which is provided in the middle of a fuel supply pipe in a housing of a fuel supply device, controls rotation of a crankshaft linked to a piston by converting the rotation of a crankshaft into a flow rate pulse signal. A flow pulse transmitter 42 to be output to the apparatus is provided on the upper part of the flow meter 41 as a separate body from the case 41a, and a valve 43 that closes when a set amount is supplied to the outlet at, for example, preset refueling is also provided. It is attached to the outside as a separate body from the case 41a.

[0003]

For this reason, for example, in order to arrange a flow rate measuring mechanism in a housing of a lubricating device, a flow rate pulse transmitter and a valve are connected to the flow meter in addition to the work of mounting the flow meter. And the work of assembling was not good.

[0004] An object of the present invention is to solve the above-mentioned disadvantages of the prior art. For example, when a flow rate measuring mechanism is provided in a housing of a lubricating apparatus, separate piping is required simply by attaching a body case of a flow meter. It is an object of the present invention to provide a flow meter which can improve the workability of assembling by eliminating other mounting work such as mounting a valve on the way.

[0005]

According to the present invention, in order to achieve the above object, an explosion-proof box is formed integrally with a main body case of a flow meter, and a valve is provided at an outlet provided in the main case of the flow meter. The gist of the invention is to provide a solenoid for controlling opening and closing of a valve in the explosion-proof box.

[0006]

According to the present invention, since the explosion-proof box and the main body case are integrated, a valve opening / closing control solenoid is disposed in the explosion-proof box. This eliminates the need to install the valve in the middle of piping separately from the main body case.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a longitudinal sectional view showing an embodiment of a flow meter according to the present invention. FIG. 2 is a cross-sectional plan view showing an embodiment of the flow meter according to the present invention. 2 shows an explosion-proof box integrally formed on the upper part of the main body case 1. The main body case 1 is composed of four cylinders 3 as shown in FIG. 2, an inflow chamber 4 communicating with the upper part thereof, and an explosion-proof box 2. A piston 5 is provided in each cylinder 3, and a slide valve 8 provided in the inflow chamber 4 is connected to a crankshaft 7 connected to a piston rod 6 of the piston 5. In the figure, reference numeral 9 denotes a spring for pressing the slide valve 8, and reference numeral 10 denotes an inflow port formed in the inflow chamber 4.

The outlet 11 formed in the crank chamber 47 communicates with an outflow passage 12 rising along the upper part of the main body case 1, and a diaphragm valve 13 is provided inside the outlet 14 at the end of the outflow passage 12.
Is arranged. Diaphragm chamber 13c in diaphragm 13a
A spring 15 for pressing the valve body 13b toward the outlet port 14 is elastically mounted therein. Further, a small hole 16 for communicating the outflow path 12 with the diaphragm chamber 13c is provided at an appropriate position of the diaphragm 13a.

The diaphragm chamber 13c and the explosion-proof box 2
The through hole 18 communicates with the valve chamber 17 formed therein, and the through hole
A valve 19 that closes 18 is provided. On the other hand, a solenoid 20 for controlling the opening and closing of the valve 19 is provided in the explosion-proof box 2, and the solenoid 20 is connected to the valve 19. Further, the valve chamber 17 and the inner wall of the outlet 14 are communicated with each other through the bore 21.

A flow pulse transmitter 22 is disposed in the explosion-proof box 2. The flow rate pulse transmitter 22 has a slit plate 25 interposed between the light emitting body 23 and the light receiving body 24 as an example. The rotation axis 25 a of the slit plate 25 is connected to the center axis of the slide valve 8. And the flow pulse transmitter 22
And the signal line of the solenoid 20 for controlling the opening and closing of the valve 19 are made coaxial via the terminal block 44 and drawn out of the explosion-proof box 2 as one signal line 26. In the figure, reference numeral 27 denotes an adjusting screw for adjusting the stroke length of the piston 5, that is, the flow rate.

Next, the operation will be described. Solenoid 20
When is turned on, the valve 19 opens, and when the valve of the refueling nozzle connected to the outflow port 14 via a piping hose (not shown) is opened, the liquid in the diaphragm chamber 13c flows out through the through hole 21.
Outflow to 14 side. Naturally, the liquid in the outflow passage 12 flows into the diaphragm chamber 13c through the small hole 16 of the diaphragm 13a, but since the middle hole 21 has a larger path than the small hole 16, the pressure in the diaphragm chamber 13c becomes lower than that in the outflow passage 12. Diaphragm valve 13
Opens against spring 15. As a result, the liquid entering the inflow chamber 4 from the inflow port 10 flows into the lower cylinder 3 via the flow path 45 switched by the slide valve 8, and
The piston 5 is pushed by the hydraulic pressure. As a result, the piston 5 and the piston rod 6 move, and the liquid in the other cylinder 3 is guided from the flow path 45 to the flow path 46 and the crank chamber 47 through the slide valve 8, and the outflow port 11, the outflow path 12, Diaphragm valve
It is allowed to flow out through the outlet 13 to the outlet 14 side.

When the liquid flows into the cylinder 3 and pushes the piston 5, the crankshaft 7 rotates with the movement of the piston rod 6, and this rotation is performed by the slide valve 8.
The slide valve 8 rotates and guides the liquid flowing into the inflow chamber 4 to another cylinder 3.

Further, with the rotation of the crankshaft 7, the rotation shaft 25a rotates and the slit plate 25 rotates. As a result, the light beam emitted from the light emitting body 23 is intermittently detected by the light receiving body 24 by the slit formed in the slit plate 25, and is converted into a flow rate pulse signal and output. When the refueling of a predetermined amount is completed, the solenoid 20 is turned off, the valve 19 is closed, and the internal pressures of the diaphragm chamber 13c and the outflow passage 12 become equal, and the diaphragm valve 13 is closed by the spring 15.

[0014]

As described above, in the flow meter of the present invention, if the main body case is provided, the valve can be provided at the same time, so that the assembling workability is improved, and the solenoid for controlling the opening and closing of the valve is connected to the main body case. Since it is provided in an integrated explosion-proof box, it can be installed as it is even in equipment that handles flammable fluids such as gasoline refueling equipment, so that the assembling work is simple. It is also possible to incorporate a flow pulse transmitter into the explosion-proof box, in which case the workability of the assembly is further improved.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of a flow meter of the present invention.

FIG. 2 is a cross-sectional plan view showing an embodiment of the flow meter of the present invention.

FIG. 3 is a side view showing a conventional example.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Body case 2 ... Explosion-proof box 3 ... Cylinder 4 ... Inflow chamber 5 ... Piston 6 ... Piston rod 7 ... Crankshaft 8 ... Slide valve 9 ... Spring 10 ... Inflow port 11 ... Outflow path 12 ... Outflow path 13 ... Diaphragm valve 13a ... Diaphragm 13b ... Valve 13c ... Diaphragm chamber 14 ... Outlet 15 ... Spring 16 ... Small hole 17 ... Valve room 18 ... Through hole 19 ... Valve 20 ... Valve open / close control solenoid 21 ... Medium hole 22 ... Flow pulse transmitter 23 ... Light emitter 24 ... Photodetector 25 ... Slit plate 25a ... Rotating shaft 26 ... Signal line 27 ... Adjustment screw 41 ... Flow meter 41a ... Case 42 ... Flow pulse transmitter 43 ... Valve 44 ... Terminal block 45 ... Flow path 46 … Flow path 47… Crank chamber

Continuation of the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) G01F 3/18 G01F 15/14

Claims (1)

(57) [Claims] An explosion-proof box is integrally formed in a main body case of a flow meter, a valve is provided at an outlet provided in the main body case of the flow meter, and a solenoid for controlling the opening and closing of the valve is provided in the explosion-proof box. Flowmeter characterized by the following.