JPH0246375A - Flow control valve - Google Patents

Abstract

PURPOSE:To set multiple kinds of flows ranging from a small flow to a large flow by constituting the main valve of a flow control valve with multiple step sections so that the tip section is tapered in steps. CONSTITUTION:The main valve 2 of a flow control valve 1 faces a valve seat hole 8a, multiple step sections 2a and 2b are formed on it so that the tip side is tapered in a steps. This main valve 2 is driven by the fluid pressure controlled by solenoid valves 13 and 17, for example. Positions of the step sections 2a and 2b of a valve plug against the valve seat hole 8a are adjusted by this drive, the valve opening is adjusted by the interval between the valve seat hole 8a and the step sections 2a and 2b.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a flow control valve that can switch the discharge amount.

(Prior art) Liquid dispensers and preset liquid dispensers used at gas stations and the like that automatically dispense liquid until the tank is full require a valve that can switch the flow rate depending on the liquid being dispensed. There is.

The technology of switching the flow rate using a valve is used as a means to shorten the cycle time of machine tools, etc.
．． (See page 103), these require several flow rate control valves in addition to the 3-way switching valve, making the equipment quite complex and expensive, as well as those that require large amounts of liquid to be supplied. The problem is that it cannot be applied to

In order to solve such problems, the applicant provided a liquid guide hole and a drain hole that communicate with the upstream and downstream sides of the liquid supply pipe in the liquid chamber on the back of the valve body, and A valve that can open and close each hole independently is installed in the through hole and the drainage hole.
We proposed a flow control valve that can change the opening degree of the valve body by changing the pressure inside the liquid chamber by operating this valve.

(Issues to be solved) According to this method, the discharge amount can be switched from a large flow rate to a small flow rate using a single valve body, but there are disadvantages in that it is difficult to adjust the stroke and the set flow rate tends to fluctuate. Ta.

The present invention has been made in view of these circumstances, and its purpose is to provide a new flow rate that can be set with high reliability with multiple types of flow rates ranging from small flow rates to large flow rates. The purpose of this invention is to provide a control valve.

(Means for Solving the Problem) That is, the present invention provides a flow rate control valve for solving the problem, including a valve seat hole that communicates the inflow side and the outflow side, and a valve seat hole that faces the valve seat hole and has a stepped tip end. The main valve is provided with a main valve formed with a plurality of stepped portions that become narrower, and a means for driving the main valve in accordance with the steps of the stepped portions. The valve opening degree is adjusted by the gap between the valve seat hole and the step.

(Example) The details of the present invention will be described below based on illustrated examples.

FIG. 1 shows an embodiment of the present invention, and the reference numeral 2 in the figure is a main valve as a flow control valve 1 disposed in a part of a liquid supply pipe 3. , a plurality of step portions 2a, 2b having step portions d+, d2 are formed on the surface facing the valve seat hole 8a, which will be described later, and have diameters rl and r2 that are tapered stepwise on the tip side. ), it also receives the pressing force of the spring 5 installed between the rear surface and the lid 4, and the static pressure on the upstream side of the pipe acting on the hydraulic pressure chamber 7 on the rear surface through the liquid guide hole 11. It is configured to always sit on the valve seat 8 facing the valve seat hole 8a.

On the other hand, on the side of the valve body 10 through which the main valve 21Fr is slidably inserted, a liquid guide hole 11 communicating with the upstream side of the liquid supply pipe 3 and a drain liquid passage hole 15 communicating with the downstream side of the liquid supply pipe 3 are provided. Each through hole 11.15 is provided with a first solenoid valve 13 and a second solenoid valve 17 for opening and closing each through hole 11.15.

In addition, the reference numeral 6 in the figure indicates a backing provided on the main valve 2, and 14.
18 is a screw valve for adjusting the flow rate provided in the liquid guide hole 11 and the drain hole 15, and 19 is a through hole bored in the wall separating the inflow side and the outflow side of the main valve 2. Each side channel for setting the minimum flow rate is shown.

Next, the opening/closing operation of the flow control valve 1 configured as described above will be explained with reference to FIGS. 1 and 3.

Fully open operation (FIG. 3(a)) The first and second solenoid valves 13 and 17 respectively close the liquid guide hole 11 and the liquid drain hole 15, and the main valve 2 abuts the valve seat 8. When the liquid supply pump (not shown) is operated in the state shown in FIG. 1 in which the liquid supply pipe 31Fr is closed and the second electromagnetic valve 17 is energized, the electromagnetic valve 17 opens the drain passage hole 15 and drains the main liquid. The hydraulic pressure chamber 7 on the back side of the valve 2 and the downstream side of the liquid supply pipe 3 are brought into communication. Therefore, the liquid in the hydraulic pressure chamber 7 flows out to the downstream side of the liquid supply pipe 3, and the main valve 2 receives the pressure of the liquid on the upstream side and rises to its limit point, fully opening the pipe. The maximum flow rate is set using the following steps (Fig. 3(a)).

Opening adjustment operation (Fig. 3 (b) to (e)) To reduce the opening from the fully open state described above, deenergize the second solenoid valve 17 and close the drain hole 5 to communicate with the downstream side. On the other hand, the first electromagnetic valve 13 is energized, the liquid guide hole 11 is opened, and the upstream side of the liquid supply pipe 3 and the hydraulic pressure chamber 7 are brought into communication. As a result, the main valve 2 starts to descend due to the pressure increase in the hydraulic chamber 7 (Fig. 3(b)
)) When the stepped portion 2b that sets the predetermined flow N reaches the valve seat hole 8a, at that point, the first electromagnetic valve 13 is de-energized and the liquid guide hole 11 is closed. As a result, the inside of the hydraulic chamber 7 maintains the state in which the stepped portion 2tl of the main valve 2 is inserted into the valve seat hole 8a due to the pressure at the time when the liquid introduction hole 11 is closed (Fig. 2 (C)
), thereby, the flow rate is determined by the opening substantially defined by the gap between the stepped portion 2b and the valve seat hole 8a.

To roughly reduce the discharge amount from this reduced state, the first electromagnetic well 13 is energized again to open the liquid guide hole 11 (the third
As shown in Fig. (d), the main valve 2 is lowered due to an increase in the hydraulic pressure in the hydraulic pressure chamber 7, and the stepped portion 2a on the large diameter side moves to the valve seat hole 8a. At this point, the first electromagnetic valve 13 is de-energized and the liquid guide hole 11 is closed. As a result, the main valve 2 is stopped with the large-diameter stepped portion 2a inserted into the valve seat hole 8a, and the third flow rate is set (FIG. 3(e)).

By the way, since these steps 2a and 2b have a constant step portion dl 62 in the direction of the valve seat, this length d
As long as the movement of the valve seat is within the range of +62, the valve seat hole 8a will be substantially constricted by the step portions 2a and 2b, so a margin should be provided for the movement accuracy of the main valve 2. Can be done.

Closing operation (Fig. 1) Finally, to close the main valve 2, if the first solenoid valve 13 is energized and the liquid guide hole 11 is kept open, the main valve is closed by the hydraulic pressure in the hydraulic chamber 7. Valve 2 descends until it touches valve seat 8, and valve seat 81F! , occlusion. Thereby, the upstream side and the downstream side are communicated only through the side passage 19, and a minimum flow rate determined by this side passage 19 is set. Thereby, the liquid can be supplied at a stable minute flow rate. When stopping the liquid supply, for example, in a liquid supply device, this can be done by closing the main valve 49 of the liquid supply nozzle 27 connected to the outlet side (see Section 5.6). figure).

By the way, FIG. 4 shows an example of a metering device using the above-mentioned flow rate control valve 1, in which a liquid supply pipe leading to a nozzle from a liquid supply pump 22 driven by a motor 21 controlled by a control device 2o is shown. 24, from the upstream side there is a flow meter 25,
The above-described flow control valve 1, nozzle hose 26, and liquid supply nozzle 27 are arranged in this order, and a control device! 20 has a flowmeter 2
A pulse signal from the flow rate pulse transmitter 28 connected to the control unit [20 The signal output from the controller is configured to be output to the first and second electromagnetic valves 13, 17 and the display 3 which displays the flow rate and preset value.

Figure 5.6 shows an example of a liquid supply nozzle suitable for applying the above-mentioned flow rate control valve.
7 is roughly divided into a cylinder tip part 40, a cylinder body part 41, and a grip part 43, and an air flow path pipe 44 having one end opened near the tip of the cylinder tip part 40 is inserted into the cylinder tip part 40. The other end is a check valve 45 provided in the cylinder body 41.
It opens into the negative pressure generating section 46 of the valve and the negative pressure chamber 48 of the automatic valve closing mechanism 47 . This check valve 45 is connected to the main valve 4.
A small pore 51 is provided to communicate the liquid chamber 50 formed by the liquid chamber 9 with the cylinder tip 40, and has a small diameter that does not inhibit the opening operation of the check valve 45 itself during liquid supply.

On the other hand, the end of the hose 26 that communicates with the liquid supply pump 22 (FIG. 4) in the metering fitting is connected to the side surface of the above-mentioned cylinder body 41, and a flow path from there to the cylinder tip 40 is connected. A main valve 49 is disposed through a valve rod 52 and is biased by a spring 53 so as to close the flow path at all times. An automatic valve-closing mechanism 47 is provided that deforms the diaphragm 54 using negative pressure and closes the main valve 49. This automatic valve closing mechanism 4
As is well known, 7 operates to close the main valve 49 when the open end 44a located at the tip of the cylindrical tip 40 of the air flow pipe 44 is blocked by liquid in the tank. 4
A diaphragm 54, which is always urged outward by a spring 55, is attached to the negative pressure chamber 48 that communicates with the negative pressure chamber 48. A piece 57 forming a shape is fixedly installed, and two bottles 581Fr valve rod 5 that slide in the long hole of this piece 57
The valve rod 5 is positioned within the notch 59 provided in a part of the valve rod 5.
The valve rod 52 and the bushing rod 60 are brought into contact with and separated from each other by engaging and disengaging the bushing rod 60 inserted into the bushing rod 2. Bush rod 60 mentioned above
is in contact with the back surface of the lever 63 so as to constantly urge the lever 63 forward by a spring 62 acting on its return end.By pulling the lever 63, whose one end is rotatably supported by a pin 64, the bushing rod 60 is moved. ! The valve rod 52 and the main valve 497i move to the right in the figure against the spring 62 and are connected to this via the pin 58! Accordingly, the flow path is opened.

Incidentally, a valve seat 65 is slidably disposed in the above-mentioned cylinder body 41 on the upstream side of the check valve 45 and abuts against the main valve 49 to close the flow path. In addition to the above-mentioned general valve seat function, this valve seat 65 has the function of controlling the main valve 49, which was removed from the bushing rod 60 when the liquid level was detected and abutted here, by the hydraulic pressure generated when the liquid supply to the sliding door is stopped. Main valve 49 is opened by opening from
It has the function of moving forward to the right in the figure and connecting it to the bushing rod 6o again via the bottle 58.
On the back side of this valve seat 65, the main valve 491F! resists the biasing force of the spring 53! : The biasing force of the compression spring 66 is acting, which is sufficient to move it to the right in the figure.

In the figure, reference numeral 67 indicates a stopper provided at the limit point of rightward movement of the valve seat 65, and 68 indicates a latch for holding the lever 63 in the pulled position.

Next, the operation of the liquid supply nozzle when full liquid is supplied using the above-mentioned flow rate control valve will be explained based on FIG. 7.

When the liquid supply nozzle 27 is hung on the nozzle hook of the metering device, that is, when the liquid supply pump 22 is stopped and the lever 63 is not operated, the state shown in FIG. 7(i)
As shown in FIG. 2, the valve seat 65, which is slidably assembled inside the cylinder body 4, moves forward to the right in the figure until it comes into contact with the stopper 67 due to the biasing force of the spring 66 acting on the back surface of the valve seat 65. I'm moving. For this reason, the main valve 49, which is in contact with the valve seat 65 under the force of the spring 53, is also pushed back to the right in the figure, and in this darkness, the bottle 58 located in the notch 59 of the valve rod 52 is It engages with the recess 59 of the push port/end 60 to connect the valve rod 52 and bushing rod 60.

Under this condition, for example, when the liquid supply nozzle 27 is removed from the nozzle hook in order to fill the fuel tank of an automobile with Ganrin, the counting means in the control device 20 is reset by a signal from the nozzle switch, and the display 31 is set to zero, and at the same time, the pump motor 21 drives the liquid supply pump 22.

In this case, since the main valve 2 of the flow control valve 1 is closed (Fig. 1), the liquid sent by the pump 22 is
flows into the nozzle 27 via the side channel 19, thus
Forced by spring 66, forward position M (right side in the figure) 1F
The valve seat 65, which was occupied by
i)).

Next, insert the tube tip 40 into the fuel supply port of the car's fuel tank and press the lever 631F! , and when it is locked in the latch 68 at that position, the bushing rod 60 pushed by the lever 63 pulls back the valve rod 52, which is integrally connected via the screw 58, to the right in the figure to open the main valve 49 (the second 7 (iii)), at this time, a small flow rate, for example 7β per minute, is generated from the side passage 19 of the main valve 1.
After a small amount of liquid is supplied at this flow rate, the solenoid 17 of the flow control valve 1 is energized to open the drain passage 15 and the main valve 2 is fully opened, for example, every minute. 45β
The discharge of jl! At this point, normal liquid supply starts (Fig. 3a,
Accordingly, the pulses output from the flow rate pulse generator 28 are integrated by the sequential counting means and displayed on the display 3.
1 is displayed as the amount of liquid supplied.

The liquid sent from the liquid supply pump 22 is guided from the negative pressure generating part 46 of the check valve 45 to the cylinder tip 4o, and then supplied from there into the tank.Needless to say, since the diameter of the pore 51 is small, The valve can be opened sufficiently by the pressure of the liquid that has passed through the main valve 49.When the liquid supply is started in this way, negative pressure is generated in the negative pressure generating section 46 of the check valve 45 due to the Venturi effect. occurs, creating a negative pressure inside the air flow pipe 44 opened here, but since the open end 44a of the air flow pipe 44 on the cylinder tip 4o side is in the atmosphere and sucks air, the air flow pipe 44 At this point, the pressure inside is normal.

In this way, when approximately 1oβ is refueled, the control device 12
With the signal output from 0 and the second solenoid valve 17 closed,
A driving current is applied to the first solenoid valve 13 for a short time, so that the first solenoid valve 13 momentarily opens and then closes. As a result, the liquid in the liquid chamber 7 increases by a small amount, and the main valve 2 moves toward the valve seat 8 side. As a result, the flow rate is determined by the difference in diameter between the stepped portion 2b and the valve seat hole 8a, for example, the flow rate is reduced to 35β/min (Fig. 3 C1, Fig. 8 III),
This flow rate throttling operation reduces the inflow amount and prevents blowback from the tank.

The liquid level in the tank rises due to subsequent liquid supply, and when the open end 44a of the tube tip 40 is eventually blocked by the bubbles on the liquid level, the inside of the negative pressure chamber 48 communicating with the air flow pipe 44 becomes a negative pressure due to the negative pressure action in the negative pressure generating section 46,
This negative pressure causes the diaphragm 54 to move upward in the figure against the spring 55, and the piece 57 integrated with the diaphragm 54 is pulled up to remove the bottle 58 from the recess 59 of the bushing rod 60.

As a result, the valve rod 52, which is released from the restraint by the bottle 58, moves to the left in the figure due to the biasing force of the spring 53 acting on itself while taking the bottle 58 with it, and brings the main valve 49 into contact with the valve seat 65. to close it and stop the liquid supply (Fig. 7 (1V)).

When this state is reached, the control device 20 opens the first solenoid valve 3 to close the main valve 2 (FIG. 1), and then stops the pump motor 21. Therefore, the valve seat 65, which has been released from the hydraulic pressure, moves forward to the right in the figure while pushing the main valve 49 away due to the urging force of the spring 66, and at the end of the movement, the valve seat 65 is again connected to the valve lever 52 and the bushing rod 60 via the bottle 58. and try to combine them. In this process, as the valve seat 65 moves, the liquid chamber 50 expands, so negative pressure tends to occur here, but air is supplied from the cylinder tip 40 through the pore 51 of the check valve 45. Therefore, the valve seat 65 can smoothly move forward via the pin 58 to the position where the valve lever 52 and bushing rod 60 are connected without causing an excessive pressure drop (FIG. 7(V)). .

Then, when a preset time M, which is 2 to 3 seconds until the bubble disappears, has elapsed from this state, the pump motor 21 is operated again by the control device 20. As a result, liquid flows from the side passage 19 of the flow control valve 1 to the nozzle 27.
The liquid flowing into the main valve body 41 moves the valve seat 65 back to the left in the figure against the spring 66, and the liquid flows into the main valve 49.
and the valve seat 65 to enter the barrel liquid supply operation (Fig. 7 (iii), Fig. 8 I°). At the stage when this refueling is performed, the tank is already close to full, so after a while the flow rate will increase. The control device 120 applies a driving current for a minute time to the second solenoid valve 17 so that the main valve 2 of the control valve 1 has a small flow rate, for example, 2oβ/min (Fig. 3 e, Fig. 8 ■), the first Step 2
Set it to a and perform liquid supply (Fig. 3 e, Fig. 4 II [
).

After this liquid supply restart operation, the opening end 44a of the air flow path pipe 44 on the cylinder tip 4o side is closed again by the bubble, and the automatic valve closing mechanism 47 that operates at the same time closes the main valve 49 and stops the liquid supply. , stop the pump motor, and also close the flow control valve 1.
The main valve 2 of the main valve 2 is closed (Fig. 1), and the pump motor is operated again after 2 to 3 seconds, and liquid is supplied from the side passage 19 to the nozzle 27 in the same manner as in the process described above, but at this stage In this case, since it is a hollow groove, the main valve 2 is not opened and liquid is supplied only through the side passage 19 (Fig. 8 I").
'), when there is no fraction in the amount of liquid supplied, the control means 20 assumes that the tank is full, and the pump motor 2
11Fr is stopped and all liquid supply operations are completed.

In the case of preset liquid supply, if the desired amount is input from the preset button 29 and the liquid is supplied, the first and second electromagnetic valves of the flow control valve 1 are activated by a signal from the control device 20 according to the liquid supply I. Valve 13.17 opens and closes and pump motor 21 at a set amount.
It stops from then and fluid supply ends.

In addition, in this embodiment, the solenoid valve of the flow control valve 1]
Although the amount of movement of the main valve is controlled by the energization time of 3.17, it is clear that the same effect can be obtained by controlling the number of pulses having a constant width.

In addition, in this embodiment, the main valve 2 is moved by actively utilizing the pressure of the liquid to be supplied, but it is also possible to connect the pipe line to another pressure source such as a compressed gas source, or It is clear that the same effect can be obtained even if the valve 2 is connected to a mechanical drive means such as a solenoid valve and moved directly.

Generally speaking, in the above-described embodiment, there are two stepped portions, but it is clear that the same effect can be achieved even if there are one, three or more stepped portions.

(Effects of the Invention) As described above, according to the present invention, a valve seat hole that communicates the inflow side and the outflow side, and a plurality of step portions facing the valve seat hole and tapering in stages on the tip side are formed. Since it is equipped with a main valve and a means for driving the main valve in response to the difference in level, the desired flow rate can be set by simply moving it to the stroke determined by the level difference in the level difference, with high reliability. This not only makes it possible to set a plurality of types of flow rates, but also eliminates the need for precision in controlling the movement of the main valve, thereby simplifying the control mechanism for moving the main valve.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a flow control valve showing an embodiment of the present invention;
Fig. 2 is an enlarged view showing the stepped portion of the main valve, Fig. 3 is a diagram showing each of its operations (a) to (e), and Fig. 4 is an example of a liquid supply device using the above flow rate control valve. Figure 5.6 is a sectional view showing an example of a liquid supply nozzle suitable for the above flow control valve, Figure 7 is an explanatory diagram showing the operation of the same liquid supply nozzle, and Figure 8 is a diagram showing the operation of the liquid supply nozzle. FIG. 1...Flow rate control valves 2a, 2b...Step portion 7...Liquid pressure chamber 13...First solenoid valve 17...Second solenoid valve 2...Main valve 3...Liquid supply pipe 11...Liquid guide hole 15...Drainage hole 19...Side route time

Claims (1)

[Claims] A valve seat hole that communicates the inflow side and the outflow side, a main valve that is formed with a plurality of step portions facing the valve seat hole and tapered in stages on the tip side, and a valve seat hole that communicates with the inflow side and the outflow side; A flow control valve comprising means for driving a main valve.