JPH0212314Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to an operation control device for a compressed air generator in a shipping device, and in particular, the amount of compressed air consumed by the opening/closing operation of a metering valve used in a shipping device for shipping oil liquid is controlled by pressure. A compressed air generator (hereinafter referred to as an air compressor) is detected by a detector and according to the consumption amount.
An object of the present invention is to provide an operation control device for a compressed air generating device in a shipping device, which controls the number of compressed air generators in operation, thereby eliminating wasted power costs due to the operation of extra air compressors.

In liquid supply and shipping equipment for tanker trucks, etc.
A metering valve installed in the middle of a liquid supply pipe such as a loading arm is configured to supply a fixed amount of liquid by controlling the opening and closing by a metering liquid supply control device, but this type of metering valve is generally operated by pneumatic pressure. A ball valve or the like using a valve body drive device is often used. In addition, in liquid supply and shipping equipment where the number of liquid supply pipes is large and the amount of air consumed by metering valves is large, it is normal to use multiple air compressors, and one air compressor Even in small-scale shipping equipment that only requires a single air compressor, a backup air compressor is often installed in case of failure.

Generally, these air compressors are individually equipped with an unloader device, etc., which automatically stops the discharge of compressed air when the discharge pressure exceeds a certain level. If air compressors are installed, for example, when air consumption is high during peak shipping times, multiple compressors can be operated simultaneously to reduce air consumption after peak shipping times. In such a case, it is desirable to stop driving the extra compressors so that only the number of compressors that correspond to the consumption is always operated to supply air.

However, when switching the number of operating air compressors, conventionally the operator has to manually switch the switch each time, which has the disadvantage of being extremely troublesome.

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 a liquid supply shipping device to which an operation control device for a compressed air generator in a shipping device according to the present invention is applied, and FIG. 2 is a circuit configuration diagram of an embodiment of the above operation control device. show.

In FIG. 1, a liquid supply shipping device 1 includes a plurality of liquid supply pipes 2,
Each liquid supply pipe _{21 to 2o} has a strainer 3, a flow meter 4, a constant flow valve 5 _, and a metering valve 6.
is provided. The liquid supply pipes ₂₁ to _2o are all connected to a liquid storage tank 9 via an air separator 7 and a liquid supply pump 8, and the liquid in the liquid storage tank 9 is transferred to the tip of the liquid supply pipes ₂₁ to _2o. loading arm 2
_1a to 2 _oa are shipped to the tank truck 10.

For example, when supplying liquid using the n-th liquid supply pipe _2o , first open the hatch of the tank truck 10 and insert the loading arm _2oa therein. Next, by setting a desired amount of liquid to be supplied to a metering liquid supply control device (not shown) and starting liquid supply, the liquid supply pump 8 is driven and the metering valve 6 is opened. As a result, the liquid in the liquid storage tank 9 passes through the liquid supply pump 8, the air separator 7, the strainer 3, the flow meter 4, the constant flow valve 5, and the metering valve 6, and enters the hatch of the tank lorry vehicle 10 from the loading arm 2 _oa . Liquid is supplied.

When the amount of liquid to be supplied reaches the scheduled amount of liquid to be supplied, the metering valve 6 is driven to close by a quantitative signal from the metering liquid supply control device, thereby automatically stopping the liquid supply.

Here, we have taken as an example the case where liquid is supplied only through the n-th liquid supply pipe _2o , but when shipments are concentrated, simultaneous oil supply using two or more liquid supply pipes is frequently performed.

Here, the metering valve 6 is configured to be opened and closed controlled by a valve body drive device 11 consisting of a pneumatically driven piston-cylinder mechanism. In this embodiment, two electric air compressors (compressed air generators) 12 and 13 are used as air pressure sources.
The number of operating vehicles is controlled by an operating vehicle number controller 14, which will be described later. The compressed air produced by the compressors 12 and 13 passes through a dryer 15 and a filter 16, and then is stored in an air tank 17.The compressed air is then stored in an air tank 17, and is connected to each branch pipe 19 through a common pipe 18 serving as an air pipe to each valve drive device 11. supplied to 20 is a pressure switch as a pressure detector installed in the common pipe 18, which detects the pressure inside the pipe 18 and closes when the pressure exceeds a preset set pressure (for example, 4 kg/cm ² ). do.

The operating number controller 14 is provided on the control panel 21, and as shown in FIG.
The electromagnetic switches 22 and 23 provided in the respective starting circuits of the 13 electric motors 12a and 13a are controlled to open and close by four relays K ₁ , K ₂ , K ₃ , and K ₄ . . Relays K ₁ and K ₃ are for controlling electromagnetic switch 22, and relays K ₂ and K ₄ are for controlling electromagnetic switch 2.
Relays K ₃ and K ₄ are provided for control, and one of them is selectively switched and used. That is, the normally open contacts and normally closed contacts of each relay K ₁ , K ₂ , K ₃ , K ₄ are connected as described later to form an electromagnetic switch that selectively drives the electromagnetic switches 22 and 23 to open and close. Drive circuits 30 ₁ and 30 ₂ are configured. Specifically, as shown in FIG. 2, an electromagnetic switch drive circuit 30 ₁ ,
30 ₂ are electromagnetic switches 22 and 23 provided between the power source and the electric motors 12a and 13a of the air compressors 12 and 13, and a first relay K that is energized and switches when the pressure of the pressure switch 20 is detected. ₁ ,
K ₂ and second relays K ₃ and K ₄ that are selectively energized and switched by a selection switch 24. That is, one electromagnetic switch drive circuit 30 ₁ is
Normally open contact k _1a of relay K ₁ and normally open contact of relay K ₃
k _3a are connected in series, and the normally closed contact of relay K ₁ is connected to the normally open contacts k _1a and k _3a directly connected in this way.
k _1b are connected in parallel, and the normally open contacts k _1a , k _3a ,
Normally open contact 2 of electromagnetic switch 22 for normally closed contact k _1b
An electromagnetic coil m _g1 that closes 2a is connected in series. Moreover, the other electromagnetic switch drive circuit 30 ₂ is
The configuration is similar to the above, but the normally open contact k _2a of relay K ₂ and the normally open contact k _4a of relay K ₄ are connected in series,
Relay for normally open contacts k _2a and k _4a connected in series
Connect the normally closed contacts k _2b of K ₂ in parallel, and also the normally open contacts
Electromagnetic switch 2 for k _2a , k _4a and normally closed contact k _2b
Electromagnetic coil m _g2 that closes the normally open contact 23a of No. 3
are connected in series. In this embodiment, the selection switch 24 regarding relays K ₃ and K ₄ is
It has been switched to the _K3 side, and relay _K4 is inactive. Note that the power switches 25 for relays K ₁ , K ₂ , K ₃ , and K ₄ are normally closed.

The operation of the operating number controller 14 will be explained below. First, when the fluid supply work for several tanker trucks 10 is concentrated, such as at the start of work or at the start of work in the afternoon, the normally open contacts 22a, 23 of the electromagnetic switches 22, 23 are turned on at the same time as the main switch 26 is turned on.
a is the electromagnetic coil m _g1 , m _g2 excited by the current passing through the normally closed contacts k _1b , k _2b of the relays K ₁ , K ₂ , respectively;
Closed by. Therefore, the electric motors 12a, 1
Both compressors 3a are energized, and the two compressors 12 and 13 begin to operate simultaneously.
In addition, the normally open contacts 27 and 28 are closed by the excitation of the electromagnetic coils m _g1 and m _g2 , and the pilot lamps 27p and 28 are closed.
Since 28p lights up, compressors 12 and 13
The display shows that both are in operation.
Also, although relay K ₃ is energized and energized, relays K ₁ and K ₂
Since the compressors 12 and 13 remain de-energized, the two compressors 12 and 13 operate in parallel unless the pressure switch 20 is closed.

As the compressors 12 and 13 operate, the pressure inside the air tank 17 and the common piping 18 and branch piping 19 that lead thereto rises, but this is because liquid is being supplied simultaneously through multiple liquid supply pipes 2 as described above. , the air consumption is large. Therefore, the pressure in the common pipe 18 does not rise above the set pressure of the pressure switch 20, and therefore, while the air consumption is large, the two compressors 12 and 13 continue to operate in parallel. It can be done.

Here, when the peak of shipping has passed and the air consumption falls below the supply amount for one compressor, the pressure in the common pipe 18 increases and the pressure switch 20
is closed. As a result, both relays K ₁ and K ₂ are energized and the normally open contacts k _1a , k _2a become the normally closed contacts k _1b ,
Close in place of k _2b . These normally open contacts k _1a and k _2a are connected to electromagnetic coils m _g1 and m _g2 via normally open contacts k _3a and k _4a of relays K ₃ and K ₄ , respectively, but one of the normally open contacts k _3a only one normally open contact is closed, the other normally open contact
k _4a remains open. Therefore, the electromagnetic coil
The electromagnetic coil m _g1 continues to be kept in an excited state, but the electromagnetic coil m _g2 is de-energized, so that the electromagnetic switch 23 is opened. Therefore, the compressor 13 that had been operating up to that point is stopped, and the compressor 12 is switched to independent operation. At the same time, the pilot lamp 28p goes out, and the lamp 28g indicating that the compressor 13 has stopped operating is turned on.

In this way, as the air consumption decreases, the pressure switch 20 is activated and the compressor 12 is automatically switched to independent operation. It is possible to effectively prevent wasted power costs due to

In addition, the air consumption has increased again and the common piping 18
When the internal pressure falls below the set pressure of the pressure switch 20, the electromagnetic switch 23 closes again as the pressure switch 20 opens, and the compressor 13 closes again.
is driven, and the two compressors 12 and 13 are operated in parallel.

Further, when all the liquid supply pipes 2 ₁ to 2 _o are not used at all, the unloader device provided in each compressor 12, 13 is activated and the drive of both compressors 12, 13 is automatically stopped.

In the above embodiment, by switching the selection switch 24 to the relay _K4 side, the compressor 13 can be operated independently when the amount of air consumed is small.

Note that the compressed air generating device is not limited to an air compressor, and any device that generates compressed air may be used.

As mentioned above, the operation control device for compressed air generators in the shipping device according to the present invention can control the number of compressed air generators in operation in accordance with the amount of compressed air consumed by the number of opening/closing operations of the metering valve, This prevents the supply of compressed air from being produced in excess of the consumption. Therefore, when the consumption of compressed air becomes less than the supply, the excess compressed air generator is stopped and the necessary It has features such as being able to efficiently operate multiple compressed air generators with minimal power costs.

[Brief explanation of the drawing]

Fig. 1 is a schematic configuration diagram of an embodiment of a liquid supply shipping device to which an operation control device for a compressed air generator in a shipping device according to the present invention is applied, and Fig. 2 is a circuit configuration of an embodiment of the above operation control device. It is a diagram. 11... Valve element drive device, 12, 13... Air compressor, 14... Operation number controller, 18...
Common piping, 20...pressure switch.

Claims (1)

[Scope of Claim for Utility Model Registration] A plurality of liquid supply pipes that supply oil in a liquid storage tank, a metering valve provided in each of the plurality of liquid supply pipes, and a metering valve that is connected to the metering valve via an air pipe. a plurality of compressed air generators that are connected to each other and generate compressed air that opens and closes the metering valve; and a pressure that is installed in the air piping and that detects the pressure in the air piping that fluctuates depending on the number of operating the metering valves. a detector, and an operation number controller that operates a number of compressed air generators corresponding to the amount of compressed air consumed by the metering valve according to the pressure detected by the pressure detector, The number controller has a plurality of electromagnetic switch drive circuits each provided between the plurality of compressed air generators and their power sources, and the electromagnetic switch drive circuit is configured to connect the plurality of compressed air generators to the power sources and the compressed air generators. a first relay that is energized to perform a switching operation when the pressure is detected by the pressure detector; and a first relay that is selectively energized by a selection switch to perform a switching operation. 2 relays, a normally open contact of the first relay and a normally open contact of the second relay are connected in series,
The normally open contact of the first relay is connected in parallel to the series connection of the normally open contact of the first relay and the normally open contact of the second relay, and the normally open contact of the first relay and the normally open contact of the second relay are connected in parallel. series connection with the normally open contact of the relay and the first
An electromagnetic coil that closes a normally open contact of the electromagnetic switch is connected in series to a normally closed contact of the relay, and an arbitrary one corresponding to the second relay selected by the selection switch is connected in series with the normally closed contact of the relay. An operation control device for a compressed air generator in a shipping device configured to operate only the compressed air generator.