JPH0118557Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a quantitative feeding device that accurately feeds a fixed amount by closing a metering valve in a feeding pipe in two stages.

Generally, metering feed devices are often used in oil refineries, shipping facilities for tanker trucks, etc., and usually open a metering valve installed in the feed piping when the feed starts, and adjust the amount of feed. The metering valve is configured to automatically close the metering valve in response to the metering signal from the preset counter when the feed amount reaches the scheduled feeding amount preset in the preset counter.

The applicant previously filed Japanese Patent Application No. 53-127719 (Japanese Unexamined Patent Publication No. 55
-55994) "Quantitative feeding device", one switching valve is set by the feeding start signal from the feeding start operating valve and outputs a valve opening signal, and is set by the feeding start signal from the feeding start operation valve, and outputs a valve opening signal by the metering signal from the metering signal transmitter. We have proposed a device that outputs a valve closing signal as a reset, and can open and close the metering valve using only the one switching valve.

However, according to this, especially when the metering valve is closed, the valve section of the metering valve switches from the fully open state to the fully closed state at once (in one step), so even if the valve closing timing is slightly off, the damage will be relatively large. This method has the disadvantage that it causes errors in the amount of feed, making it difficult to control the quantity, and it also has the disadvantage that the water hammer phenomenon tends to occur in the feed piping, which may result in damage to the piping system.

Therefore, an object of the present invention is to provide a quantitative feeding device that eliminates the above-mentioned drawbacks.

The present invention consists of a flow meter installed in the fluid supply piping,
A feed start operation valve that is operated to output a feed start signal when the feed is started, and a first quantitative signal that outputs a first quantitative signal when the measured value of the flowmeter matches a predetermined feed amount that is smaller than the final feed amount. a first quantitative signal transmitting section that outputs a quantitative signal, a second quantitative signal transmitting section that outputs a second quantitative signal when the measured value matches the final feeding amount, and the feeding start operation valve. It has a connected set port and a reset port connected to the second quantitative signal transmitter, and is set by the feed start signal supplied to the set port and outputs a main valve opening signal. and a switching valve that is supplied with the second quantitative signal to a reset port and stops outputting the main valve opening signal; a NOT element that outputs as a sub-valve-opening signal and stops outputting the sub-valve-opening signal when the first quantitative signal from the first quantitative signal transmitter is input together with the main valve-opening signal. The main valve opening signal from the switching valve provided in the fluid supply piping and the sub-opening signal from the NOT element type air-operated valve are input to fully open the air-operated valve, and the sub-opening signal is input to the air-operated valve. It consists of a metering valve that opens in one stage when the input of the valve signal is stopped, and closes in two stages when the input of the main valve opening signal is stopped. That is, in the present invention, a pair of quantitative signal transmitting units are provided, and when the feeding amount reaches a value slightly smaller than the final feeding amount, and when the final feeding amount reaches the value, the first and second quantitative signals are emitted, respectively. In addition, by providing a NOT element type air-operated valve in the branch line on the output side of the switching valve, the sub-valve opening signal and the main valve-opening signal are transmitted from the air-operated valve and the switching valve, respectively, to each of the above-mentioned fixed amounts. The signal is outputted to the metering valve as appropriate in response to the signal supply timing, and the metering valve is closed in two stages.

Next, one example thereof will be explained.

Fig. 1 is a schematic configuration diagram of an embodiment of the quantitative feeding device according to the present invention, Fig. 2 is a signal waveform diagram of each part to explain the operation of the above device, and Fig. 3 is a diagram of the signal waveforms per unit time of the above device. FIG. 3 is a diagram showing changes in feeding amount.

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 fluid such as oil, and has a scheduled feed amount set in advance. The control device 5 supplies a valve closing signal to the drive unit 4a of the metering valve 4 to automatically stop the feeding when the amount matches the amount. The metering valve 4 has a main valve part and a sub-valve part, and when the valve is opened, both valve parts are opened at the same time, and when the valve is closed, both valve parts are closed at the same time, or the main valve part is closed first. After that (one-stage valve closing), the auxiliary valve part closes (two-stage valve closing).

A preset counter 6 is provided in the control device 5, and the scheduled feed amount is set in the preset counter 6 before the start of feeding. The preset counter 6 is connected to the flow meter 3, and when the amount of feed measured by the flow meter 3 matches the scheduled amount of feed, the first and second nozzle flap mechanisms 6a in the preset counter 6 are activated. , 6b, the signal air at different constant pressures is transmitted to the first and second quantitative signals 6a-1, 6b.
Output as -1.

Reference numeral 7 denotes a feeding start operating valve, which is manually switched when starting feeding, and supplies a constant pressure air signal from an air source 8 to a switching valve 11, which will be described later, as a set input. A feed stop operation valve 10 is connected to the feed start operation valve 7, and when it is desired to stop the feed in an emergency, the operation valve 10 can be manually switched to accept the above-mentioned set input. The switching valve can be reset by opening it to the atmosphere.

Reference numeral 9 denotes a NOT element type air-operated valve, in which one input side pipe 12 is connected to the first nozzle flapper 6a, another input side pipe 13 is branched from a pipe 24 described later, and an output side pipe is connected to the first nozzle flapper 6a. 14 is connected to the drive section 4a of the metering valve 4. This air-operated valve 9 receives a pilot signal (first quantitative signal 6a-
1) is not supplied, the pipes 13 and 14
Because of the configuration in which the main signal from the pipe 13 is connected, the air as the main signal from the pipe 13 is directly output to the pipe 14 as the first output signal 14-1 (auxiliary valve opening signal), and the air is also output to the pilot via the pipe 12. When a signal is supplied, the conduit 13 side is closed and the conduit 14 is opened to the atmosphere.

The switching valve 11 is constructed using a self-protection type three-way switching valve. Three fixed ports, a supply port 15s, an output port 15o, and an exhaust port 15e, are formed on the circumferential surface of a fixed sleeve (not shown) of the switching valve 11, and three fixed ports are formed at both ends of the fixed sleeve. Port 21s and reset port 21r
is formed. A switching valve main body 11a is fitted within the fixed sleeve so as to be able to move up and down as shown in FIG. 1, and is always urged toward the set port 21s by a coil spring 22 that is compressed and fitted on the reset port 21r side. The switching valve 11 is of a reset priority type in which the reset input has priority over the set input.

Further, the switching valve main body 11a is provided with a self-holding communication hole 11b that communicates the central part and the end thereof, and the output port 15o and the set port 21s are always in communication via this communication hole 11b. For,
As will be described later, if the set input is held, the set state is self-maintained.

Here, the supply port 15s of the switching valve 11 is connected to the air source 8 via a pipe line 23, the output port 15o is connected to the drive part 4a of the metering valve 4 via a pipe line 24, and the exhaust port 15e is connected to the air source 8 via a pipe line 23. open to the atmosphere. Further, the set port 21s of the switching valve 11 is connected to the feed start operation valve 7 through a conduit 25, and the reset port 21r is connected to the second nozzle flapper mechanism 6b of the preset counter 6 through a conduit 26. It is connected. When set, this switching valve 11 outputs the air from the conduit 23 as it is from the output port 15o to the conduit 24 as a second output signal 24-1 (main valve opening signal).

Next, the operation of the quantitative feeding apparatus 1 having the above-mentioned structure will be explained with reference to FIGS. 2 and 3.

First, prior to the start of metered feeding, for example, at time _t1 in FIG. 2, if a reset button (not shown) of the preset counter 6 is pressed, the counter is reset and becomes the transmitting state from the previous feeding operation. The first and second quantitative signals 6a-1 and 6b-1 that were
They are turned off as shown in Figures C and D, respectively. Here, the current scheduled feeding amount is set in the counter.

Next, at time _t2 in FIGS. 2 and 3, the feeding start operation valve 7 is manually switched. As a result, air from the air source 8 is supplied to the set port 21s of the switching valve 11 as a set input through the operating valve 7. As a result, the switching valve main body 11a is switched and displaced toward the reset port 21r against the force of the spring 22. Therefore, the output port 15o is cut off from the exhaust port 15e and communicated with the supply port 15s.

Therefore, the air supplied from the air source 8 to the supply port 15s of the switching valve 11 is transferred to the output port 15o.
On the one hand, it is supplied directly through the line 24 to the drive 4a of the metering valve 4 as a second output signal 24-1. On the other hand, the air is supplied to the air-operated valve 9 through the branch line 13, but at this time the pilot signal from the line 12 (the first quantitative signal 6
Since signal a-1) is not reached, it is also supplied to the drive unit 4a via the air-operated valve 9 indirectly through the line 14 as the first output signal 14-1.
The metering valve 4 thus outputs the first and second output signals 14.
-1 and 24-1 are respectively supplied and fully opened.

Here, a part of the air supplied to the output port 15o of the switching valve 11 is supplied to the set port 21s via the communication hole 11b. Therefore, even if the hand is removed from the feed start operation valve 7 and the supply of air to the switching valve 11 is cut off, the set state of the switching valve 11 is self-maintained.

When the metering valve 4 opens, the fluid starts to be fed through the feeding pipe 2, and after a predetermined time period, the fluid is metered and the feeding continues as shown in FIG. This feed amount is measured by a flow meter 3, and the measured value is supplied to a preset counter 6.

Assume that after starting the quantitative feeding as described above, for example at time _t3 in FIG. 2, it becomes necessary to urgently stop the quantitative feeding due to some circumstances. In this case, the feed stop operation valve 10 is switched, and the set port 21s of the switching valve 11 is opened to the atmosphere via the operation valve 10. As a result, the switching valve main body 11a of the switching valve 11 is returned to the switching position upward in FIG. 1 by the spring force of the spring 22, and the self-holding state is released. As a result, the output port 15o of the switching valve 11 is cut off from the supply port 15s and communicated with the exhaust port 15e. For this reason, until then, from the switching valve 11 to the pipe line 24
or through the conduit 13, the air-operated valve 9, and the conduit 14 in sequence to the drive unit 4a of the metering valve 4 (output signals 14-1, 24-
1) is released into the atmosphere from the exhaust port 15e of the switching valve 11. Therefore, the output from the switching valve 11 to the metering valve 4 disappears, and the main valve portion and the sub valve portion of the metering valve 4 close simultaneously.

At this time, the configuration of the quantitative feeding device 1 has returned to the state shown in FIG. Therefore, when it is desired to start fixed-quantity feeding again, at time _t4 in FIG. 2, the operation valve 7 for starting feeding is again pressed and switched, and the switching valve 11 is switched to the set state in exactly the same manner as in the above case. and the first and second output signals 1
4-1 and 24-1 are output, the metering valve 4 is opened, and fluid feeding is restarted as shown in FIG.

When the measured value of the flowmeter 3 matches a predetermined feed amount (a value smaller than the final feed amount) set in advance in the preset counter ₆ , for example at time t5 in FIG. The first quantitative signal 6a-1 is transmitted from the first nozzle flapper mechanism 6a of the preset counter 6 as shown in FIG.

This first quantitative signal 6a-1 is supplied as a pilot signal to the air-operated valve 9 via the line 12. Therefore, the output of the first output signal 14-1 from the air-operated valve 9 via the conduit 14 is stopped. Therefore, the main valve portion of the metering valve 4 is closed at one stage and becomes a half-open state, and as shown in FIG. 3, the amount of fluid fed decreases and once becomes a constant flow rate.

Next, at time _t6 in FIG. 2, when the measured value of the flow meter 3 matches the final feeding amount set in the preset counter 6, the second nozzle of the preset counter 6 is activated as shown in FIG. A second quantitative signal 6b-1 is transmitted from the flapper mechanism 6b.

This second quantitative signal 6b-1 is supplied as a reset input to the reset port 21r of the switching valve 11 via the conduit 26, and the switching valve main body 11a is connected to the pressure receiving area difference between the end on the set port side and the end on the reset port side. The spring force of the spring 22 causes the switching displacement to return upward in FIG. As a result, the output port 15o of the switching valve 11 is communicated with the exhaust port 15e in the same way as in the above case, the air in the pipe line 24 is discharged to the atmosphere from the exhaust port 15e, and the second output signal 24-1 disappears. Therefore, the sub-valve portion of the metering valve 4 is also closed, that is, it is closed in two stages, and is in a fully closed state. Thus, the feeding is stopped as shown in FIG.

If you want to start the fixed amount feeding again after the fixed amount feeding is finished, you can press the reset button again and set the scheduled feeding amount.

As described above, the metering feed device 1 can open and open the metering valve 4 by simply combining a pair of nozzle flappers 6a, 6b, one NOT element type air-operated valve 9, and one switching valve 11. It is possible to close the valve in two stages, and its configuration is extremely simple and assembly work is easy.Since the valve is closed in two stages, it is difficult to cause feed amount errors and accurate quantitative control can be performed. Water hammer phenomenon is less likely to occur in the feeding pipe 2, and there is no risk of damaging the piping system, thereby improving reliability.

In addition, the metering feed device 1 can close the metering valve 4 in two stages with a small number of parts, so it has a compact configuration and has a small number of parts, making it easy to manufacture and easy to maintain. Moreover, the reliability is high because the probability of failure is small.

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.

Furthermore, at the start of quantitative feeding, if the nozzle of the first nozzle flapper mechanism 6a is closed by the flapper until a fixed flow rate flows or a fixed period of time has elapsed, a pilot signal is supplied to the air-operated valve 9. Therefore, the metering valve 4 can be opened in one step (half-open state), and then when the nozzle is opened, the pilot signal to the air-operated valve 9 is cut off, and the metering valve 4 can be opened in two steps (fully open state). can be done.

As described above, according to the quantitative feeding device according to the present invention, a pair of quantitative signal transmitting parts are provided so that the feeding amount becomes a value slightly smaller than the final feeding amount and the final feeding amount value. At the same time, an air-operated valve is provided in the branch line on the output side of the switching valve, and a sub-valve opening signal and a main opening signal are transmitted from the air-operated valve and the switching valve, respectively. The valve signal is outputted to the metering valve as appropriate in accordance with the supply timing of each of the metering signals mentioned above, and the metering valve is closed in two stages.
It is only necessary to provide a NOT element type air-operated valve and a switching valve, which simplifies the construction and assembly work.The two-stage valve closing allows accurate quantitative control and prevents the water hammer phenomenon, making the equipment reliable. It can improve sex. Furthermore, since the metering valve can be closed in two stages with a small number of parts, the configuration can be made compact, which makes manufacturing easier and maintenance easier.Moreover, the probability of failure is low and reliability is high. It has features such as high

[Brief explanation of the drawing]

Fig. 1 is a schematic configuration diagram of an embodiment of the quantitative feeding device according to the present invention, Fig. 2 is a signal waveform diagram of each part to explain the operation of the above device, and Fig. 3 is a diagram of the signal waveforms per unit time of the above device. FIG. 3 is a diagram showing changes in feeding amount. 1...Quantitative feeding device, 2...Feeding piping, 3...
Flow meter, 4... Metering valve, 6... Preset counter, 6a, 6b... Nozzle flapper, 7... Operation valve for starting feeding, 9... NOT element type air operated valve,
11...Switching valve, 21s...Set port, 21
r...Reset port.

Claims (1)

[Scope of utility model registration request] A flow meter installed in the fluid feed piping, a feed start operation valve that is operated at the start of the feed and outputs a feed start signal, and a predetermined feed where the measured value of the flow meter is smaller than the final feed amount. a first quantitative signal transmitter that outputs a first quantitative signal when the measured value matches the final feeding amount; and a second quantitative signal that outputs a second quantitative signal when the measured value matches the final feeding amount. It has a transmitter, a set port connected to the feed start operation valve, and a reset port connected to the second quantitative signal transmitter, and the feed start signal supplied to the set port is a switching valve which is set and outputs a main valve opening signal and which stops outputting the main valve opening signal by supplying the second quantitative signal to the reset port; and a switching valve which is branch-connected to the switching valve. When a main valve opening signal from the main valve opening signal is inputted, this is output as a sub-valve opening signal, and when the first quantitative signal from the first quantitative signal transmitter is inputted together with the input of the main valve opening signal. A NOT element type air operated valve that stops outputting the auxiliary valve opening signal, a main valve opening signal from the switching valve provided in the fluid supply piping, and a auxiliary opening signal from the NOT element type air operated valve. A quantitative feeding device comprising a metering valve that opens fully when a valve signal is input, closes in one stage when input of the sub-valve opening signal is stopped, and closes in two stages when input of the main valve opening signal stops. .