JPH0222644Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention relates to a flow rate measuring device installed in lorries and the like.

(Prior Art) Conventionally, as a flow measuring device installed in a lorry vehicle, etc., a separator 02 and a back pressure valve 06 are arranged before and after a flow meter 04, as shown in FIG.
It has a structure in which an air pipe for supplying air separated by the separator 02 is connected from the separator 02 to a driving chamber 07 formed by a diaphragm 08 above the valve body 09 of the back pressure valve 06.

However, the saturated steam in the drive chamber 07 cools and becomes water droplets, and the diaphragm 08 of the drive chamber 07
When the separator 02 expands and contracts in the vertical direction, a pumping action occurs, and the liquid inside the separator 02 flows into the drive chamber 07.
There was a problem in that the load of these particles entered the inside of the diaphragm 08 and accumulated on the diaphragm 08, making the operation of the valve body 09 unstable and making it impossible to accurately measure the flow rate.

(Problem to be solved by the invention) The present invention was made in view of the above points, and provides a flow rate measuring device that can stably measure the flow rate even if the liquid in the separator flows into the back pressure valve side. This is what we provide.

(Example) An example will be explained below with reference to the drawings.
1 is a flow measuring device installed in a lorry vehicle (not shown), and a separator 2 for separating air from liquid is provided at its upstream (tank side) inlet.

The separator 2 has an inlet 2a and an outlet 2b connected to the inlet of the flow rate measuring device, and an air communication port 2c is provided at the upper part thereof. Further, a float valve 3 is floatingly positioned below the communication port 2c, and the float valve 3 is operated vertically depending on the liquid level to open and close the communication port 2c. Further, on the downstream side of the separator 2, a flowmeter 4 having a counter 5, for example, a positive displacement flowmeter, is provided, and a back pressure valve 6 is connected to an outlet of the flowmeter 4. The back pressure valve 6 is connected to the outlet of the flow meter 4, and has an inlet 6a that also serves as a valve seat and a liquid outlet 6b on the opposite side.
Further, a communication port 6c communicating with the drive chamber 7 and a communication port 6d communicating with the discharge port 6b are formed in the upper part thereof. Further, a valve body 8 that is slidable in the front and rear direction is provided on the front outer periphery of the drive chamber 7.
is inserted with a slight gap, and the valve body 8
A spring 9 disposed between the drive chamber 7 and the valve body 8 urges the suction port 6a to the normally closed state. Further, air pipes 10 and 11 are provided between the separator 2 and the back pressure valve 6 to release air separated from the liquid.
is connected to the communication port leading from the relief port 2c of the separator 2 to the drive chamber 7 of the back pressure valve 6, and the other air pipe 11 is connected from the relief port 2c to the discharge port 6b of the back pressure valve 6 via the throttle portion 2d. Communication port 6 leading to
connected to d. Furthermore, the discharge port 6c of the back pressure valve 6
After installing an on-off valve 15 in the pipe connected to the
It is connected to the in-shaft oil supply of a hose reel 12, and liquid is supplied through a hose 13 wound around this reel and a nozzle 14 connected to its tip.

The present invention is constructed as described above, and its operation will be explained below. Before refueling starts, the float valve 3 of the separator 2 is pushed up by the liquid and the relief port 2c is closed, and the back pressure valve 6, the valve body 8 is also placed in a closed state by the bias of the spring 9, and the flow meter 4 is in a stopped state.

When refueling from this state, when the on-off valve 15 is opened by operating a lever and the nozzle 14 is opened, liquid from a tank (not shown) flows to the back pressure valve 6 via the separator 2 and the flow meter 4.

As a result, the valve body 8 is moved backward against the biasing force of the spring 9, and the suction port 6a is opened. displayed (Figure 2).

During refueling, air mixed in the liquid separates and accumulates in the upper space of the separator 2, and when the liquid level drops, the float valve 3 goes down at the same time.
The escape port 2c is automatically opened. Then, the air that had accumulated at the top of separator 2 flows to one side of air pipe 1.
0 to the driving chamber 7 of the back pressure valve 6, and its saturation pressure causes the valve body 8 to move forward, temporarily closing the suction port 6a, and at the same time stopping the flow meter 4 (FIG. 3).

Further, the remaining air separated by the separator 2 is slightly delayed by the constriction part 2d, flows from the other air pipe 11 to the communication port 6d of the back pressure valve 6, and is discharged from the nozzle 14 to the outside.

When the empty space in the separator 2 is discharged, the liquid level rises again, so the float valve 3 closes the relief port 2c. As a result, the supply of air to the back pressure valve 6 side is cut off, so the valve body 8 of the back pressure valve 6 is returned to the open state by the pressure of the liquid level, and the liquid can be supplied again.

After refueling at the required flow rate, the nozzle 14 and the on-off valve 15 are returned to the closed state opposite to the above, and the refueling operation is completed.

By the way, since the valve body 8 is slidably fitted in the drive chamber 7 in the front-rear direction, liquid will enter the inside and outside of the drive chamber 7, but the liquid pressure inside and outside the drive chamber 7 will be the same pressure. Therefore, the longitudinal sliding movement of the valve body 8 is not affected in any way.

(Effects of the invention) As described above, according to the invention, since the valve body of the back pressure valve is operated in the front and back direction, even if liquid enters, there is no effect on the operation of the valve body. , the operation of the valve body becomes reliable, and at the same time, the precision of the flowmeter increases, making it possible to accurately measure the flow rate.

[Brief explanation of drawings]

Fig. 1 is a schematic configuration diagram of an embodiment of the oil supply device according to the present invention, Figs. 2 and 3 are longitudinal sectional views showing its operating state, and Fig. 4 is a longitudinal sectional view showing the conventional operating state. be. 1...Flow rate measuring device, 2...Separator, 4...
...Flowmeter 5...Counter, 6...Back pressure valve, 10,
11...Air piping.

Claims (1)

[Scope of utility model registration request] A flow measurement device that controls the opening and closing of the flow meter's outlet by installing a separator at the inlet of the flowmeter and a back pressure valve at the outlet, and connecting air piping that transfers air separated from the liquid from the separator to the back pressure valve. In,
A valve body slidable in the front and back direction is inserted into a drive chamber built into the back pressure valve, and the air separated by the separator is supplied to the downstream side via the drive chamber to bypass the flow meter. A flow rate measuring device characterized in that it is configured as follows.