JPH04322737A - Automatic dilution supply device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] This invention is an automatic dilution supply for injecting other liquids (chemical solutions, etc.) at a predetermined flow rate into the main fluid transfer system in chemical plants, water and sewage facilities, food processing plants, etc. It is related to the device.

0002

[Prior Art] Conventionally used quantitative proportional injection devices for injecting a fixed amount of chemical liquid into a predetermined fluid transfer system include a metering pump that responds each time a unit signal is transmitted from a flow meter installed in the main flow system. It was customary to use a solenoid metering pump.

0003

[Problem to be solved by the invention] However, in the case of this solenoid-type metering pump, the stroke length is limited to a maximum of 1 mm or less due to the torque generated by the solenoid, so it is impossible to inject a large volume of chemical solution into the mainstream system. In addition, this type of metering pump has the disadvantage that the control circuit picks up electromagnetic induction from factories, etc., causing malfunctions.In addition, when injecting large volumes with this type of solenoid metering pump, the flow rate transmitter must A method of operating the unit multiple times per unit signal has also been implemented, but since the amount of discharge per operation is extremely small, the number of solenoid operations increases when injecting a large amount, resulting in wasted power and the risk of burnout of the solenoid. There are limits to the use of this type of metering pump.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a relay that is energized by the closing operation of a contact mechanism provided in an integrating flowmeter installed in a main flow system, and to provide a unit of a drive motor output shaft for driving a metering pump. A switch mechanism is provided that switches the contacts every rotation, and a pair of normally open contacts are provided that close the circuit when the relay is energized. One of the normally open contacts is connected in series with a delay timer and connected to a power source, and the other is connected in series with a delay timer. a normally open contact, together with one contact of the switch mechanism and a timer contact of the delay timer, is connected in series to a pump start contact and connected to a power source, and the other contact of the switch mechanism is connected directly to the pump start contact; By configuring the circuit so as to be connected to the power source, the operation of the metering pump is stopped at the timing of the switching operation of the contacts of the switch mechanism and the set time of the delay timer, and the liquid injected into the main flow system is appropriately controlled. An object of the present invention is to provide an automatic dilution supply device that can easily change the dilution concentration by proportional injection.

[0005]

[Means for Solving the Problems] In order to achieve the above object, an integrating flowmeter is provided in the mainstream system with a contact mechanism that performs a closing operation at every predetermined flow rate, and based on the operation of this contact mechanism, the main flow system is connected to the main flow system. In an automatic dilution supply device that is equipped with a metering pump that supplies a predetermined amount of liquid and is configured to supply a predetermined amount of liquid to the main flow system in proportion to the flow rate, the In addition to providing a relay that is energized, a switch mechanism is provided that switches the contacts for each unit rotation of the output shaft of the drive motor that drives the metering pump, and a pair of normally open contacts that are closed by the energization of the relay, One normally open contact is connected in series with a delay timer and connected to a power supply, and the other normally open contact is connected in series with a pump start contact together with one contact of said switch mechanism and a timer contact of said delay timer to supply power. and connect the other contact of the switch mechanism directly in series with the pump start contact to connect to a power source, energizing the relay activates a delay timer to start the metering pump, and the switch mechanism The present invention is characterized in that the circuit is configured to stop the operation of the metering pump based on the timing between the switching operation of the contacts and the set time of the delay timer.

[0006]

[Operation] According to the automatic dilution supply device according to the present invention, a relay is provided which is energized by the closing operation of a contact mechanism provided in an integrating flowmeter installed in a main flow system, and a drive motor that drives a metering pump is provided. A switch mechanism is provided that switches the contacts for each unit rotation of the output shaft, a pair of normally open contacts are provided that close the circuit when the relay is energized, and one normally open contact is connected in series with a delay timer and connected to a power source. the other normally open contact is connected in series with one contact of the switch mechanism and a timer contact of the delay timer to a pump start contact and connected to a power supply; By configuring the circuit so that it is connected in series to the starting contact and connected to the power supply, the operation of the metering pump is stopped at the timing of the switching operation of the contact of the switch mechanism and the setting time of the delay timer, and the low It is now possible to easily change the dilution concentration by appropriately injecting the liquid into the mainstream system using a cheap metering pump, and even if various chemical solutions are used as the injection liquid, the dilution concentration can be adjusted proportionally. can be accommodated.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the automatic diluting and supplying apparatus according to the present invention will be described in detail below with reference to the accompanying drawings. FIGS. 1 and 2 show an embodiment of the present invention, and FIG. 1 is a system diagram of an automatic dilution supply device that controls the injection of a chemical solution into a main fluid transfer system such as a water supply system. In the figure, reference numeral 10 indicates a water system, to which a part of the water system is connected an integrated flow meter 12 and a mixing tank 14 for mixing a chemical solution injected into the water system with water. This integrating flowmeter can freely set the unit flow rate, and is equipped with a contact mechanism 13 that transmits a voltageless contact signal and performs a circuit closing operation when the flow rate in the water system reaches the set flow rate.

On the other hand, a discharge pipe 22 of a diaphragm metering pump 20 is connected to another part of the water system 10 (near and upstream of the mixing tank 14), and the metering pump 2
The suction pipe 24 of No. 0 is connected to a chemical solution storage tank 26 . In this case, the pump chamber of the metering pump 20 is configured as a metering chamber 25, and the medicinal solution is sucked and discharged by the reciprocating movement and the action of the suction and discharge valves caused by the rotation of the eccentric cam 28 attached to a part of the output shaft of the drive motor 18. I do. In addition, metering pump 20
The discharge amount can be changed within a range of 0 to 100% by adjusting the eccentricity of the eccentric cam 28.

Furthermore, a disc cam 30 attached to another part of the output shaft of the drive motor 18 operates a microswitch 32 as a switch mechanism by a dog protruding from its outer periphery, thereby rotating the unit rotation of the output shaft of the drive motor 18. The sensor is configured to emit a detection signal for each detection signal.

FIG. 2 shows a control circuit diagram of a metering pump drive motor for injecting a chemical solution. That is, the control circuit for the metering pump drive motor provided inside the control panel 16 shown in FIG.
The contact mechanism 13 is connected and the R1 relay 34 is energized by the closing operation of the contact mechanism 13.
A pair of R1a normally open contacts 36 and 37 are provided to close the circuit when the R1 relay 34 is energized to form a bipolar circuit, and one R1a normally open contact 36 is connected to a T1 delay timer 38.
The other R1a normally open contact 37 is connected in series to the power supply, and the other normally open contact 37 is connected to one normally open contact 50 corresponding to the common contact 48 of the switching contacts 46 provided in the microswitch 32 constituting the switch mechanism. The PM pump start contact 40 together with the T1 b timer contact 54 of the T1 delay timer 38
A circuit is constructed by connecting the other normally closed contact 52 of the switching contact 46 in series to the PM pump starting contact 40 and connecting it to a power source.

According to the control circuit for the metering pump drive motor configured as described above, when the amount of water flowing through the pipes of the water system reaches the set flow rate, the integrated flow meter 10 detects this and makes a contact for each unit integrated flow rate. The closing operation of the reed switch as the mechanism 13 sends out a no-voltage contact signal and energizes the R1 relay 34, which causes the pair of R1a normally open contacts 3
6 and 37 are closed, and the operation of the T1 delay timer 38 is started.

In the initial state of the output shaft when driving the pump, the normally open contact 50 of the switching contact 46 is closed by the dog of the disc cam 30, and at the same time, the T1 timer contact 54 is also closed by the operation of the delay timer 38, so that the metering pump drive motor is closed. 1
8.

Immediately after starting the drive motor 18, when the dog of the disk cam 30 leaves the Ms1 microswitch 32 due to the rotation of the motor output shaft, the switching contact 48 changes to the normally closed contact 5.
2 and maintains the energized state, metering pump drive motor 1
8 continues rotation.

On the other hand, the T1b self-holding timer contact 54 of the delay timer 38 is maintained in a closed state until the set time elapses. In this case, when the disk cam 30 rotates once and the Ms1 microswitch 32 is operated again to switch the changeover switch 48 to the normally open contact 50 and energize,
If the set time of the T1 delay timer 38 is exceeded and the T1b timer contact 54 is in an open state, the metering pump 20 stops operating at that point.

Therefore, the setting time of the T1 delay timer 38 is set longer than the time required for the eccentric cam 30 to rotate once and the Ms1 microswitch 32 to switch to the normally open contact 50 again. If the metering pump is rotated multiple times in response to one signal transmitted from the integrating flow meter 10, and the set time of the delay timer is appropriately changed, extremely highly concentrated chemical solution can be easily injected into the water system. Can be done.

[0016]

As is clear from the embodiments described above, according to the present invention, a relay is provided which is energized by the closing operation of a contact mechanism provided in an integrating flowmeter installed in a main flow system, and Equipped with a switch mechanism that switches the contacts every unit rotation of the drive motor output shaft that drives the pump,
A pair of normally open contacts are provided that close when the relay is energized, one normally open contact is connected in series with a delay timer and connected to a power source, and the other normally open contact is connected to one contact of the switch mechanism and the above. By configuring a circuit such that a timer contact of a delay timer is connected in series with a pump start contact and connected to a power source, and the other contact of the switch mechanism is directly connected in series with the pump start contact and connected to a power source. ,
The operation of the metering pump is stopped based on the timing between the switching operation of the contacts of the switch mechanism and the set time of the delay timer, and the supply liquid to be injected into the main fluid transfer system can be easily proportionally injected as appropriate using an inexpensive metering pump. This makes it possible to adjust the dilution concentration proportionally even if various chemical solutions are used as the injection liquid, making it possible to use it in a wide range of applications such as sewage treatment and the food industry, in addition to chemical solutions. It has excellent effects such as: Although the preferred embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and it goes without saying that various design changes can be made without departing from the spirit of the present invention.

[Brief explanation of drawings]

FIG. 1 is a system diagram of an automatic dilution supply device that controls the injection of liquid into a main stream system such as a water supply system, showing one embodiment of the present invention.

FIG. 2 is a control circuit diagram of a metering pump drive motor that controls injection of liquid into a main stream system such as a water supply system, showing one embodiment of the present invention.

[Explanation of symbols]

10 Water system
12 Integrating flowmeter 13 Contact mechanism
14 Mixing tank 16 Control panel
18 Drive motor 20 Metering pump
22 Discharge pipe 24 Suction pipe
26
Chemical solution storage tank 28 Eccentric cam
30 Disc cam 32 Switch mechanism (micro switch) 34 Relay 36, 37, 50 Normally open contact
38 Delay timer 40 Pump start contact
46 Switching contact 48 Common contact
52 Normally closed contact 54 Timer contact

Claims (1)

[Claims] Claim 1: The main flow system is provided with an integrating flowmeter equipped with a contact mechanism that performs a closing operation at every predetermined flow rate, and a metering pump is provided that supplies a predetermined amount of liquid to the main flow system based on the operation of the contact mechanism. In an automatic dilution supply device configured to supply a predetermined amount of liquid to a main flow system in proportion to its flow rate, a relay is provided that is energized by the closing operation of a contact mechanism of an integrating flowmeter, and a metering pump is driven. A switch mechanism is provided for switching the contacts for each unit rotation of the output shaft of the drive motor, and a pair of normally open contacts are provided that close the circuit when the relay is energized, and one normally open contact is connected in series with a delay timer. the other normally open contact is connected in series with a pump start contact together with one contact of said switch mechanism and a timer contact of said delay timer to a power source; is directly connected in series to the pump start contact and connected to a power supply, and the delay timer is actuated by energizing the relay to start the metering pump, and the switching operation of the contact of the switch mechanism and the setting time of the delay timer are performed. An automatic dilution supply device characterized by having a circuit configured to stop the operation of a metering pump at the timing of.