JPH049945B2 - - Google Patents

Description

[Detailed Description of the Invention] (a) Industrial Application Field The present application particularly relates to a flow rate control valve that is inserted into a flow path of a so-called oil supply device that meters and supplies oil, and adjusts the flow rate of the flow path according to various conditions. It is related to the device.

(b) Conventional technology Modern refueling systems include a preset refueling method in which the desired refueling amount and amount are set in advance, an exact refueling method in which refueling ends when all values below 1/10 liter are zero, and Many have a built-in safety stop refueling system that reduces the discharge flow rate (velocity) for a certain period of time at the start of refueling, and immediately stops refueling if the nozzle's built-in valve is opened during this time.

In the preset lubrication method and exact lubrication method, in order to improve stopping accuracy, the flow rate is throttled slightly before stopping, and lubrication is performed in a small stream.
The safe stop lubrication system also maintains a small flow for a certain period of time at the start of lubrication, but in order to achieve this small flow, we have developed a system that controls the rotational speed of the motor that drives the pump and a small bypass path for the oil flow path. The former method is cheaper when only one flowmeter is connected to one pump, while the former method is cheaper when multiple flowmeters are connected to one pump. Sometimes the former method is not possible and the latter method is adopted. In the latter method, a large solenoid valve that closes the oil flow path and a small solenoid valve provided in the flow path that bypasses this solenoid valve are used as a set.

(c) Problems to be solved by the invention When large and small solenoid valves are used as a set, the electrical parts that make up the refueling system must all have an explosion-proof structure because they handle oil liquids such as gasoline that have a risk of ignition and explosion. This is 3 to 5 times the price of general products that do not have explosion-proof construction, and large solenoid valves in particular account for a very large proportion of the price of the entire refueling system, and the price of other explosion-proof electrical parts is much higher than that of other explosion-proof products. Electrical work was also becoming expensive.

(d) Structure and operation for solving the problems Therefore, the present application eliminates the need for expensive solenoid valves, especially large solenoid valves, eliminates the need for explosion-proof electrical work, and thus provides an inexpensive lubrication device and a pre-set lubrication system. , we propose a flow control valve device that is capable of controlling oil supply using a lubrication method or a safety stop lubrication method, that is, a main valve element that opens and closes the main flow path and is normally biased in the valve closing direction; a valve chamber that is separated from the main flow path by a main valve chamber and into which the main valve body retreats when the valve is opened; a narrow passage that communicates the upstream flow path of the main valve body with the valve chamber; and a downstream flow path of the main valve body. In a device having a sub-flow path that communicates with the valve chamber and has a sub-valve inserted therein that is arbitrarily opened and closed, a communication chamber that communicates with the downstream flow path of the main valve body is provided, and A displacement body, which is displaced by hydraulic pressure and includes a regulating member for regulating valve-opening displacement of the main valve body, is biased in a direction against the hydraulic pressure and installed in the communication chamber.

(E) Example In Figs. 1 and 2, 2 is a pump rotated by a motor 6 housed in a case 4, and the oil pumped out by the pump 2 is sent to flow meters M ₁ and M ₂ . be guided.

V ₁ , V ₂ are flow control valve devices, flow meters M ₁ , M ₂
After passing through valve devices V ₁ and V ₂ , the oil metered in is sent to hoses H ₁ and H ₂ and further to nozzles N ₁ and N ₂ .

W ₁ and W ₂ are pilot solenoid valves (auxiliary valves) that function as described later, and P ₁ and P ₂ are flowmeters M ₁ and M ₂ that measure one unit of oil, for example, 1/200 liter. Pulse transmitter that outputs a flow rate pulse signal, C ₁ ,
C ₂ is a nozzle case that stores nozzles N ₁ and N ₂ when not in use, and S ₁ and S ₂ are nozzles in cases C ₁ and C ₂ .
A nozzle detection switch that detects the presence or absence of N ₁ and N ₂ and outputs a corresponding nozzle signal; 8 is a control unit that houses an electric circuit that controls the entire refueling device; 10 is a display that displays the amount of refueling, amount of refueling, and unit price The display 12 is an operation panel equipped with a value key 14 and switches L ₁ and L ₂ for specifying the nozzle on which to use the preset value display F ₁ and F _2. For example, the key 14
When the preset amount is set with and the switch _L1 is operated to specify the nozzle _N1 , the set amount will be displayed on the display _F1 .

Next, the internal structure of the control valve device will be explained according to FIGS. 3 and 4. Since the control valve devices V ₁ and V ₂ have the same structure, only the control valve device V ₁ will be shown and the following explanation will be based on the nozzle N ₁ side. The flow path will be described representatively.

Reference numeral 20 denotes a piston-type valve body that opens and closes the main flow passage 22. The valve body 20 is always urged by a spring 24 in the direction of seating on the valve seat 26.
The pressure of the oil flowing through the upstream flow path 28 causes the oil to retreat into the valve chamber 30.

32 is a communication chamber, and the main valve body 2 is connected to the main valve body 2 through the communication chamber 34.
The displacement body 38 installed in the communication chamber 32 is moved by a spring 40 in a direction that resists the hydraulic pressure of the flow path 36, that is, in a direction that reduces the volume of the communication chamber 32. A rod-shaped regulating member 42 implanted and fixed to the displacement body 38 extends into the valve chamber 30 through a partition wall 44 between the communication chamber 32 and the valve chamber 30 .

Reference numeral 46 denotes a sub-flow path in which a solenoid valve W ₁ is inserted and communicates between the valve chamber 30 and the flow path 36, 48 a narrow path that communicates the flow path 28 and the valve chamber 30, and 50 an opening of the communication path 34. A needle valve 52 adjusts the area, an adjusting bolt 52 adjusts the position of the disk 54 supporting the spring 40 and adjusts the force with which the displacement body 38 is pressed, and 56 and 58 O-rings for sealing.

In the above configuration, first, nozzle N ₁ is connected to the case.
When waiting for refueling stored in C ₁ , motor 6
is deenergized and solenoid valve W ₁ is also closed, so that device V ₁ is in the state shown in solid lines in FIG. Note that the built-in valve (not shown) of nozzle _N1 is also closed.

When the nozzle N ₁ is removed from the case C ₁ to start the refueling operation, the motor 6 is energized by the signal output from the switch S ₁ and the solenoid valve W ₁ is opened.

Since the pump 2 is driven by the energization of the motor 6, the hydraulic pressure in the flow path 28 increases, and a portion of the oil flows through the narrow path 48, the valve chamber 30, and the sub-flow path 46 to the flow path 3.
6. At this time, since the built-in valve of the nozzle _N1 is still closed, the oil in the flow path 36 flows into the communication chamber 32 via the communication path 34 due to the pump pressure, and is displaced against the bias of the spring 40. body 38
is pushed up to the position indicated by the two-dot chain line in FIG. 3, but at this time the main valve body 20 remains closed. Note that the flow meter
_M1 measures only the oil required to push up the displacement body 38.

On the other hand, if the built-in valve of nozzle _N1 remains open at the start of refueling, flow path 3
The hydraulic pressure of the valve 6 does not increase, and therefore the displacement body 38 cannot be pushed up, and the main valve body 20 is moved between the spring 24 and the regulating member 4
The closed state is maintained by the pressing force of 2, and the state shown by the solid line in FIG. 3 is maintained. However solenoid valve W ₁
is open, the oil in the flow path 29 flows into the flow path 36 through the narrow path 48, the valve chamber 30, and the communication path 46, and is discharged from the nozzle _N1 . At this time, the amount of oil discharged from nozzle N ₁ passes through the narrow passage ₄₈ , so it is very faint and not enough to cause a major accident. Since the amount of oil exceeds the amount of oil required to push up the displacement body 38 when the built-in valve of the previous nozzle _{N 1 is} closed, the amount of oil exceeds the amount of oil required to push up the displacement body 38 when the built-in valve of the previous nozzle N ₁ is closed. or the motor 6 is also deenergized at the same time to stop the oil discharge from the nozzle _N1 (safety stop).

If the built-in valve of nozzle N ₁ is not open when the refueling operation starts, set nozzle N ₁ to the fuel filler port of the car and open the built-in valve, the hydraulic pressure in the flow path 36 will drop rapidly (it will not reach zero). ) channel 28 and channel 3
6 (that is, inside the valve chamber 30), and since the displacement member 42 is not pushing the main valve body 20 at this time, the main valve body 20 is opened widely against the bias of the spring 24. At this time, the hydraulic pressure in the communication chamber 32 decreases and the displacement body 38 starts to descend as it is pushed by the spring 40, but since the communication chamber 34 is throttled by the needle valve 50, the descending speed of the displacement body 38 becomes slow. Finally, the main valve body 20 is activated by the combined force of the force of the oil passing through the valve seat 26, the pressure difference between the flow path 28 and the valve chamber 30, the pressure of the oil in the communication chamber, and the spring 40. The resultant force of the spring 24 and the spring 24 are pushed back to a balanced position, and the state shown in FIG. 4 is reached.

If the refueling operation is continued in this state and a preset refueling or a stop due to just refueling is to be performed, only the solenoid valve _W1 is temporarily closed before the target refueling amount (for example, 0.2 liters) is reached. Then, communication between the valve chamber 30 and the flow path 36 is cut off, and the valve chamber 3
When the hydraulic pressure in the valve 0 becomes equal to the hydraulic pressure in the flow path 28, the previous balanced state collapses and the combined force of the springs 40 and 24 causes the valve body 20 to become closed as shown in FIG. Oil discharge from nozzle _N1 is stopped. After that, when the solenoid valve W ₁ is opened again, the built-in valve of the nozzle N ₁ remains open at this time, so the state is the same as described for the safety stop earlier, that is, the oil in the flow path 36 is The pressure does not rise until the displacement body 38 is pushed up, and the valve body 20 is no longer opened. Therefore, the oil in the flow path 28 flows into the flow path 36 via the narrow path 48, the valve chamber 30, and the communication path 46, and a small stream is discharged from the nozzle _N1 .

Then, when the amount of oil supplied matches the target amount, if the solenoid valve W ₁ is closed again, the oil supply from the nozzle N ₁ will be automatically completed, and by returning the nozzle N ₁ to the case C ₁ . At this time, if the nozzle N ₂ is not in use, the motor 6 will be deenergized, but in the case of preset lubrication or so-called full lubrication where no lubrication is performed just yet, the nozzle N ₁ will be returned to case C ₁ . Therefore, as above, the nozzle
If _N2 is not in use, the motor 6 is deenergized and the solenoid valve _W1 is closed to wait for the next refueling.

Note that in the above configuration, the narrow passage 48 does not necessarily have to be a hole in the main valve body 20, but is a gap between the main valve body 20 and the wall of the valve chamber 30 that slides when the main valve body 20 moves in and out. The displacement body 38 may be of a piston type, a diaphragm type, or another type.

(f) Effects With the configuration as detailed above, by adopting the flow path control valve device of the present invention, it is possible to omit the use of expensive large explosion-proof solenoid valves and the accompanying explosion-proof electrical work, and it is possible to eliminate the need for one pump. Even when multiple flowmeters and nozzles are connected to the pilot, conventional functions can be achieved by simply opening and closing the pilot solenoid valve (auxiliary valve), making it possible to supply an inexpensive refueling device.

[Brief explanation of drawings]

Figure 1 shows the front outline of the oil supply system, Figure 2 shows the simplified internal configuration of the oil supply system, and Figures 3 and 4 show the structure of the flow control valve system under different conditions. This is a diagram. 6...Motor, 12...Operation panel, 20...
... Main valve body, 28 ... Upstream flow path, 30 ... Valve chamber,
36...Downstream channel, 32...Communication chamber, 38...
Displacement body, 42...Regulation member, 46...Subchannel,
V ₁ , V ₂ ...flow control valve device, W ₁ , W ₂ ... pilot solenoid valve (auxiliary valve).

Claims (1)

[Claims] 1. A main valve element that opens and closes the main flow path and is always biased in the valve closing direction, a valve chamber that is separated from the main flow path by the main valve element and into which the main valve element retreats when the valve is opened, and a valve chamber upstream of the main valve element. In a device having a narrow passage that communicates between a side passage and a valve chamber, and a sub passage that communicates between a passage on the downstream side of a main valve body and the valve chamber, and in which a sub valve that is arbitrarily opened and closed is inserted in the middle. , a communication chamber communicating with the flow path downstream of the main valve body is provided,
A displacement body, which is displaced by the hydraulic pressure in the flow path downstream of the main valve body and is provided with a regulating member that regulates valve opening displacement of the main valve body, is biased in a direction against the hydraulic pressure to force the displacement body into the communication chamber. A flow control valve device characterized in that it is installed inside.