JPS6246438B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a quantitative feeding device, in which a reset input has priority over a set input, and a switching valve that self-maintains the set state is used, and a feeding start signal is sent to a set port and a reset port, respectively. , an object of the present invention is to provide a quantitative feeding device that is configured to supply a quantitative signal and can control the opening and closing of a quantitative valve by the output of a single switching valve.

In general, fixed-quantity feeding devices are often used in oil refineries, shipping facilities for tanker trucks, etc., and normally a fixed-quantity valve installed in the feeding pipe is opened when feeding starts, and the amount of feed is controlled. The metering valve is configured to automatically close the metering valve in response to a metering signal from the preset counter when the scheduled feeding amount preset in the preset counter is reached.

However, conventional quantitative feeding devices have a first switching valve that is manually operated to output a valve opening signal to the metering valve when feeding starts, and a metering valve that is switched by a metering signal from a preset counter. The metering valve is configured to include a second switching valve that outputs a valve closing signal to the metering valve, which makes the circuit configuration complicated.
It has the disadvantage that it cannot be easily assembled and disassembled.

Furthermore, when the above quantitative feeding device is used to supply liquid to a tank of, for example, a tank lorry, a liquid level detector has conventionally been generally provided in the tank in order to prevent the liquid from overflowing from the tank. However, in this type of device, in order to close the metering valve in response to a signal from the liquid level detector, it is necessary to provide a third switching valve between the liquid level detector and the metering valve. This method has disadvantages such as further complication.

The present invention eliminates the above-mentioned drawbacks, and an embodiment thereof will be described below with reference to the drawings. 1st
The figure is a schematic configuration diagram of an embodiment of the quantitative feeding device of the present invention, Figures 2 and 3 are longitudinal cross-sectional views of an embodiment of the switching valve at the time of resetting and at the time of setting, respectively, and Figure 4
The figure shows a signal waveform diagram of each part for explaining the operation of the quantitative feeding device.

In FIG. 1, a metering feed device 1 includes a flow meter 3 and a metering valve 4 such as a ball valve in a feed pipe 2 for, for example, oil or the like.
is provided, and when the feed amount matches the preset scheduled feed amount, the controller 5 controls the drive unit 4 of the metering valve 4.
It is configured to automatically stop feeding by supplying a valve closing signal to a.

A preset counter 6 is provided in the control device 5, and the scheduled feed amount is set in this preset counter 6 before the start of feeding. The preset counter 6 is connected to the flowmeter 3, and when the amount of feed measured by the flowmeter 3 matches the scheduled amount of feed, a signal air of a constant pressure is sent from the nozzle flapper mechanism 6a in the preset counter 6. is output as a quantitative signal.

Reference numeral 7 denotes a feeding start operation valve which is manually switched when starting feeding, and supplies a constant pressure air signal from an air source 8 as a set input to a switching valve 9 to be described later. A feed stop operation valve 10 is connected to the feed start operation valve 7, and the above-mentioned set input can be performed by manually switching the operation valve 10 when, for example, it is desired to stop the feed in an emergency. The switching valve 9 can be reset by opening it to the atmosphere.

The switching valve 9 constitutes a main part of the present invention, and in this embodiment, it is constructed using a self-holding type three-way switching valve shown in FIGS. Sleeve body 1 of switching valve 9
1 has a supply port 11s and an output port 1 on its circumference.
Three ports are formed: 1o and exhaust port 11e, and a set port 12 and a reset port 13 are formed at both ends of the sleeve 11, respectively. A spool 14 is fitted into the sleeve 11 so as to be slidable within a predetermined section. As shown in FIGS. 2 and 3, the spool 14 includes a spool body 14b that communicates or blocks communication between the supply port 11s and the output port 11o, and between the output port 11o and the exhaust port 11e; A first pressure receiving part 14c provided at the upper end and a second pressure receiving part 14d provided at the lower end of the spool body 14b.
It becomes more. The first pressure receiving part 14c receives the pressure of the air supplied to the set port 12, and the second pressure receiving part 14d receives the pressure of the air supplied to the reset port 13. Further, the second pressure receiving portion 14d has a larger diameter than the first pressure receiving portion 12c, and has a larger pressure receiving area. Furthermore, the second pressure receiving part 14d
is set port 1 due to the elastic force of the coil spring 15.
It is constantly pressed against the 2nd side.

Therefore, when a pressure signal is supplied to the set port 12 of the spool 14, a pressing force greater than the pressing force of the spring 15 acts on the first pressure receiving portion 14c,
As shown in FIG. 3, it is displaced to the reset port 13 side.

Further, when a pressure signal is supplied to the reset port 13, a pressing force greater than the air pressure acting on the first pressure receiving portion 14c acts on the second pressure receiving portion 14d,
Furthermore, since the pressing force of the spring 15 acts, the spool 14 is displaced to the reset state (shown in FIG. 2) with good responsiveness to the supply of the pressure signal. That is, the switching valve 9 is of a reset priority type in which the reset input has priority over the set input.

The spool 14 is also provided with a communication hole 14a that communicates the center and end portions of the spool 14 with the output port 1.
Since the set port 1o and the set port 12 are always in communication through the communication hole 14a, the set state is self-maintained as long as the set input is held as described later.

Here, the supply port 11s of the switching valve 9 is connected to the pipe line 1.
6 to the air source 8, the output port 11o is connected to the drive part 4a of the metering valve 4 via the pipe 17, and the exhaust port 11e is open to the atmosphere. Also, the set port 12 of the switching valve 9 is connected to the pipe line 18.
The reset port 13 is connected to the preset counter 6 through a conduit 19 to the operation valve 7 for starting feeding.
The nozzle flapper mechanism 6a is connected to the nozzle flapper mechanism 6a.

Next, the operation of the quantitative feeding apparatus 1 having the above-mentioned structure will be explained with reference to FIG. 4.

First, before starting fixed-rate feeding, a scheduled feeding amount is set in the preset counter 6. Next, at time _t1 in FIG. 4, the feeding start operation valve 7 is manually switched. As a result, air from the air source 8 is supplied through the operating valve 7 to the set port 12 of the switching valve 9 as a set input. As a result, the spool 14 is displaced toward the reset port 13 against the spring 15, switching from the state shown in FIG. 2 to the state shown in FIG. Therefore, the output port 11o is cut off from the exhaust port 11e and communicated with the supply port 11s.

Therefore, the air supplied from the air source 8 to the supply port 11s of the switching valve 9 is supplied to the drive section 4a of the metering valve 4 through the output port 11o, and the metering valve 4 is opened.

Here, a part of the air supplied to the output port 11o flows through the communication hole 14a formed in the spool 14.
is supplied to the set port 12 via. Therefore, take your hand off the feeding start operation valve 7 and switch the switching valve 9.
Even if the air supply to the switching valve 9 is cut off, the set state of the switching valve 9 is self-maintained.

When the metering valve 4 opens, the amount fed through the feed pipe 2 is measured by the flow meter 3, and the measured value is supplied to the preset counter 6.
Then, the measured value of the flowmeter 3 is, for example, at the time in Fig. 4.
At t ₂ , when the feeding amount matches the scheduled feeding amount set in advance on the preset counter 6, the preset counter 6
A quantitative signal is output from the nozzle flapper mechanism 6a.

This quantitative signal is supplied as a reset input to the reset port 13 of the switching valve 9 via the conduit 19, and the spool 14 is connected to the pressure receiving area difference between the set port side end and the reset port side end and the spring as shown in FIG. It is displaced toward the set port 12 by the spring force of 15. As a result, the output port 11o of the switching valve 9 is cut off from the supply port 11s and communicated with the exhaust port 11e. Therefore, the air that had been supplied from the switching valve 9 to the drive unit 4a of the metering valve 4 is released to the atmosphere from the exhaust port 11e of the switching valve 9, and the output from the switching valve 9 to the metering valve 4 disappears. The metering valve 4 is closed.

In this manner, the quantitative feeding device 1 automatically stops feeding when the feeding amount reaches the scheduled feeding amount.

As described above, the switching valve 9 is of the reset priority type, and the spool 14 is forcibly reset by the air pressure acting on the second pressure receiving portion 14d having a large pressure receiving area and the pressing force of the spring 15. Therefore, when the fixed amount feeding is completed, the fixed amount signal is input to the reset port 13 of the spool 14, and the spool 14 is immediately switched to the reset state. Therefore, the time from when the quantitative signal is output to when the quantitative valve 4 closes is shorter, and the overflow amount when the valve is closed can be small. Therefore, the quantitative feeding device 1 can reduce the amount of error during quantitative feeding and perform more accurate quantitative feeding.

Here, it is assumed that fixed-quantity feeding is started at time _t3 in FIG. 4, and it becomes necessary to stop fixed-quantity feeding for some reason at time _t4 , for example. In this case, the feed stop operation valve 10 is switched and the set port 12 of the switching valve 9 is opened to the atmosphere via the operation valve 10. As a result, the spool 1 of the switching valve 9
4 is connected to the set port 12 by the spring force of the spring 15.
It is displaced to the side and self-holding is released. Therefore, the switching valve 9 is in the reset state as if it had been switched by the metering signal, and the metering valve 4 is closed.

In addition, when restarting feeding after stopping the quantitative feeding, the same operation as when starting the quantitative feeding may be repeated.

As mentioned above, since the metering valve 4 can be opened and closed by the output of the single switching valve 9, the metering feed device 1 has an extremely simple configuration and is extremely easy to assemble and disassemble. be able to. In addition, since the number of parts can be reduced compared to the conventional device, the piping inside the control device 5 can be simplified, and the connections between the pipes 16 to 19 can be made reliably, so that the connecting parts of the pipes can be easily connected. It is possible to reliably prevent fluid leakage from.

Further, since the metering feed device 1 has a simple configuration of the switching valve 9, maintenance and inspection work during periodic inspection or when cleaning each part is easy, and the device is excellent in maintainability.

Next, another embodiment of the present invention will be described with reference to FIG. FIG. 5 shows a schematic diagram of another embodiment of the quantitative feeding apparatus of the present invention. In FIG. 5, the same components as those in FIG. 1 are given the same reference numerals, and their explanations will be omitted.

In this embodiment, the quantitative feeding device 21 is applied to a quantitative shipping device such as a tank lorry, and the tank 22 of the tank lorry is provided with a liquid level detector 23 for preventing overflow. The signal from the liquid level detector 23 serves as an emergency stop signal, and is supplied to the reset port 13 of the switching valve 9 together with the quantitative signal from the preset counter 6. Therefore, in this embodiment, the reset port 1 of the switching valve 9
Connect the shuttle valve 24 to 3, and connect the shuttle valve 24 to
4 is connected to a conduit 19 from the preset counter 6 and a conduit 25 from the liquid level detector 23, and when a signal is supplied from at least one conduit 19 or 25, the switching valve 9 is switched. .

Here, it is assumed that the liquid level in the tank 22 reaches the dangerous liquid level before the fixed amount feeding ends. In this case, the liquid level detector 23 is activated and a constant pressure signal is supplied to the shuttle valve 24 via the conduit 25. As a result, a constant pressure signal is supplied to the reset port 13 of the switching valve 9 via the shuttle valve 24, and the switching valve 9 is switched. At the same time, the metering valve 4 is closed and the supply to the tank 22 is automatically stopped, thereby preventing overflow.

In this way, the quantitative feeding device 21 having the above configuration
The single switching valve 9 receives a feed start signal, a metering signal, an emergency signal, etc., and the output of the switching valve 9 can open and close the metering valve 4. It can be configured extremely easily.

In both of the above embodiments, the fluid flowing through the feed pipe 2 is not limited to oil, but may be any other fluid.

Furthermore, in both of the above embodiments, the working fluid of the control device 5 is not limited to air, but may be any other fluid.

As described above, the metering feed device of the present invention sets the switching valve by operating the feeding start operation valve and supplying a signal to the set port of the switching valve, and the metering valve is set by the output of the switching valve. When the valve is opened and the feeding amount matches the preset scheduled feeding amount,
The metering signal output from the metering signal transmitter resets the switching valve and automatically closes the metering valve, so a single switching valve can open and close the metering valve. This eliminates the need to provide separate switching valves for opening and closing the metering valve in response to the feed start signal and metering signal, as in conventional metering feeders, which greatly simplifies the configuration and reduces the number of parts. The piping can be simplified to the extent that it is small, and the piping can be connected reliably, so fluid leakage from the piping connection can be reliably prevented, and the disassembly and reassembly of the device can be simplified during maintenance and inspection. It has the advantage that it can satisfactorily simplify the work such as the above, facilitate the maintenance and inspection work during periodic inspection or when cleaning each part, and improve maintenance.

In addition, the quantitative feeding device of the present invention is provided with a liquid level detector in the container to which fluid is fed by the fluid feeding piping, and detects the liquid level when the liquid level in the container reaches a preset value. Since the switching valve is configured to be reset by the signal from the detector, for example, if the liquid in the container is about to overflow before the quantitative signal is output from the quantitative signal transmitter, the signal from the liquid level detector will be reset. The switching valve is reset by the output, and the metering valve is automatically closed to prevent overflow. Also, overflow can be prevented simply by connecting the liquid level detector and the switching valve's reset port to each other. Since the above-mentioned problems can be prevented, the entire device can be configured extremely easily.

Furthermore, the switching valve is configured so that the spool is always biased toward the reset side by a spring, so that
The reset input can be prioritized over the set input, and during the reset operation, the spool is forcibly moved to the reset state by the air pressure acting on the second pressure receiving part with a large pressure receiving area and the pressing force of the spring. Therefore, the time from when the metering signal is input to closing the metering valve can be shortened and the responsiveness of the valve closing operation can be improved, thereby reducing the amount of feed and making metered feeding more accurate. can be done. Furthermore, by configuring the output port and the set port to be in constant communication through the communication hole formed in the spool, the set state can be self-maintained by the output from the output port even when the set input is lost. This makes it possible to maintain the switching valve in the set state without having to keep operating the feed start operation valve one by one when starting feed, and it is possible to reset the state automatically with a simple configuration without using a complicated circuit. It has features such as being able to be held, allowing for miniaturization of the device, and being able to perform switching operations more reliably by supplying a pressure signal.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram of an embodiment of the quantitative feeding device of the present invention, and FIGS. 2 and 3 are longitudinal cross-sectional views of an embodiment of the switching valve at the time of resetting and at the time of setting, respectively.
FIG. 4 is a signal waveform diagram of each part for explaining the operation of the quantitative feeding apparatus, and FIG. 5 is a schematic diagram of another embodiment of the quantitative feeding apparatus of the present invention. 1...Quantitative feeding device, 2...Feeding piping, 3...
Flowmeter, 4...Quantitative valve, 6...Preset counter, 7...Operation valve for starting feeding, 9...Switching valve, 1
1... Sleeve, 11s... Supply port, 11o
...Output port, 11e...Exhaust port, 12...
...Set port, 13...Reset port, 14
...Spool, 15...Coil spring, 21...Quantitative feeding device, 22...Tank, 23...Liquid level detector.

Claims (1)

[Claims] 1. A flow meter and a metering valve provided in a fluid feeding pipe, a feeding start operation valve that is operated at the time of starting feeding and outputs a feeding start signal, and a metered value of the flow meter. a metering signal transmitter that outputs a metering signal when the amount matches a preset scheduled feed amount, a supply port connected to an air source, an output port connected to a driving section of the metering valve, an exhaust port, and the feed start. A main body is provided with a set port connected to the control valve for use in the test, and a reset port connected to the quantitative signal transmitter, a spool displaceably fitted into the main body and communicating or blocking communication between the ports, and the spool. A switching valve having an energizing means for constantly pressing to return to the reset state, and a switching valve that is operated before the completion of quantitative feeding to cut off the air supply to the set port, switch the switching valve to the reset state, and stop the feeding. a first pressure receiving part provided at one end of the spool and receiving a pressing force greater than the pressing force of the urging means in response to a pressure signal supplied from the set port; , a second pressure receiving part provided at the other end and having a larger pressure receiving area than the first pressure receiving part and receiving a pressure signal supplied from the reset port; and a second pressure receiving part that is connected to the output port and the first pressure receiving part. When a pressure signal from the feed start operation valve is supplied to the set port, the feed port is displaced to the set state against the pressing force of the urging means, and the supply port and the output port, and allows the air pressure from the supply port to act on the first pressure receiving section through the communication hole to self-maintain the set state, and the pressure signal from the quantitative signal transmitting section is supplied to the reset port. When the second pressure-receiving part is forced into the reset state by the air pressure from the reset port acting on the second pressure receiving part and the pressing force of the urging means, the output port and the exhaust port are communicated with each other, and the metering valve is closed. A quantitative feeding device characterized in that the pressure signal to the meter is turned off. 2. A flow meter and metering valve provided in the fluid supply piping, a container to which liquid is supplied by the fluid supply piping, and a supply start device that is operated at the time of starting the supply and outputs a supply start signal. an operating valve, a quantitative signal transmitter that outputs a quantitative signal when the measured value of the flowmeter matches a preset scheduled feed amount, a supply port connected to an air source, and a drive unit of the quantitative valve. A main body is provided with an output port, an exhaust port, a set port connected to the feeding start operating valve, and a reset port connected to the quantitative signal transmitter, and each port is displaceably fitted into the main body. a switching valve having a spool that communicates with or cuts off between the spool and an energizing means that presses the spool to always return to the reset state; a feeding stop operation valve that switches the valve to a reset state to stop feeding; and a switching valve that is provided in the container and that is configured to operate when the liquid level of the liquid fed into the container reaches a preset value. a liquid level detector that supplies a signal to a reset port of the spool;
A first pressure receiving part provided at one end receives a pushing force greater than the pushing force of the urging means in response to a pressure signal supplied from the set port, and a pressure receiving area larger than the first pressure receiving part provided at the other end. has a second pressure receiving part that receives a pressure signal supplied from the reset port, and a communication hole that communicates the output port and the first pressure receiving part, and the feeding start operation is performed. When a pressure signal from the valve is supplied to the set port, it is displaced to the set state against the pressing force of the urging means, and the supply port and the output port are communicated, and the supply port is supplied through the communication hole. The air pressure from the port is applied to the first pressure receiving part to self-maintain the set state, and when the pressure signal from the quantitative signal transmitting part is supplied to the reset port, the second pressure receiving part
The air pressure from the reset port acting on the pressure receiving part of the valve and the pressing force of the energizing means preferentially shift the valve to the reset state, communicate the output port and the exhaust port, and turn off the pressure signal to the metering valve. A quantitative feeding device characterized in that it is configured to: