JP2995102B2 - Automatic dilution supply device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic dilution supply for injecting another liquid (chemical liquid, etc.) into a main fluid transfer system at a predetermined flow rate ratio in a chemical plant, a water and sewage system, a food processing plant and the like. It concerns the device.

[0002]

2. Description of the Related Art In a conventionally used quantitative proportional injection device for quantitatively injecting a chemical solution into a predetermined fluid transfer system, a metering pump of a system which responds to a unit signal transmitted from a flow meter installed in a main fluid system each time. It was customary to use a solenoid type metering pump.

[0003]

However, in the case of this solenoid type metering pump, since the stroke length is suppressed to a maximum of 1 mm or less in relation to the torque generated by the solenoid, it is impossible to inject a large volume of the chemical into the main fluid system. In addition, this type of metering pump has the drawback that the control circuit picks up electromagnetic induction from the factory or the like and malfunctions.In addition, when performing large-volume injection with this type of solenoid metering pump, the flow is transmitted from the flow transmitter. Although a method of operating multiple times for each unit signal performed has also been implemented, the amount of discharge per operation is extremely small, so that the number of times of operation of the solenoid increases during large volume injection, power consumption is wasted, and the solenoid is burned out. However, the use of this type of metering pump has its limitations.

Accordingly, an object of the present invention is to provide a relay which is energized by a closing operation of a contact mechanism provided in an integrating flow meter provided in a main fluid system, and to provide a unit of a drive motor output shaft for driving a metering pump. A switch mechanism for switching contacts at every rotation is provided, a pair of normally-open contacts that are closed by a bias of the relay is provided, one of the normally-open contacts is connected in series with a delay timer, and the other is connected to a power supply, and the other is connected to a power source. The normally open contact is connected in series to one of the switch mechanism and the pump start contact together with the timer contact of the delay timer, and this is connected to the power supply, and the other contact of the switch mechanism is directly connected to the pump start contact directly. By connecting the circuit to a power supply, the operation of the metering pump is controlled by the timing of the switching operation of the contact point of the switch mechanism and the set time of the delay timer. Performs stop, is to provide an automatic dilution supply device capable of changing the liquid to be injected into the main flow scheme suitable proportion injected into the dilution easily.

[0005]

In order to achieve the above object, the main fluid system is provided with an integrating flow meter provided with a contact mechanism for performing a closing operation at a predetermined flow rate. In an automatic dilution and supply device configured to supply a predetermined amount of liquid to the main fluid system in proportion to the flow rate by providing a fixed amount pump for supplying a predetermined amount of liquid, the automatic dilution supply device is operated by a closing operation of a contact mechanism of an integrating flow meter. Along with providing a biased relay, providing a switch mechanism for switching the contacts for each unit rotation of the output shaft of the drive motor that drives the metering pump, providing a pair of normally open contacts that perform a closing operation by the bias of the relay, One normally open contact is connected in series with the delay timer, which is connected to the power supply, and the other normally open contact is directly connected to the pump start contact together with one contact of the switch mechanism and the timer contact of the delay timer. Connected to a power source, and further connected the other contact of the switch mechanism directly to the pump starting contact in series to connect to a power source, actuate a delay timer by energizing the relay to start a metering pump, The circuit is configured to stop the operation of the metering pump based on the timing of the switching operation of the contact point of the switch mechanism and the set time of the delay timer.

[0006]

According to the automatic dilution and supply device of the present invention, a relay which is energized by a closing operation of a contact mechanism provided in an integrating flow meter provided in a main fluid system is provided, and a drive motor for driving a metering pump is provided. A switch mechanism for switching contacts at every unit rotation of the output shaft is provided, and a pair of normally open contacts that are closed by a bias of the relay are provided. One of the normally open contacts is connected in series with a delay timer and connected to a power supply. The other normally open contact is connected in series to a pump starting contact together with one contact of the switch mechanism and the timer contact of the delay timer, connected to a power supply, and the other contact of the switch mechanism is directly connected to the pump. By configuring the circuit so as to be connected in series to the starting contact and to be connected to the power supply, a fixed amount can be determined by the timing of the switching operation of the contact of the switch mechanism and the set time of the delay timer. The pump operation is stopped, and the dilution concentration can be easily changed by appropriately injecting the liquid to be injected into the main fluid system using a low-priced metering pump driven by a motor. Can also be used to appropriately control the dilution concentration.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of the automatic dilution and supply apparatus according to the present invention will be described in detail with reference to the accompanying drawings.
1 and 2 show an embodiment of the present invention. FIG. 1 is a system diagram of an automatic dilution and supply device for controlling injection of a chemical solution into a main fluid transfer system such as a water supply system. In the figure, reference numeral 10 denotes a water system, and an integrating flow meter 12 and a mixing tank 14 for mixing a chemical solution injected into the water system with water are connected to a part of the water system. The integrating flow meter can freely set a unit flow rate, and includes a contact mechanism 13 for transmitting a no-voltage contact signal and performing a 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 type metering pump 20 is connected to another part of the water system 10 (upstream near the mixing tank 14).
The zero suction pipe 24 is connected to a chemical storage tank 26.
In this case, the pump chamber of the metering pump 20 is configured as a metering chamber 25, and reciprocation and rotation of the eccentric cam 28 mounted on a part of the output shaft of the drive motor 18 and suction and discharge of the chemical solution by the action of the suction and discharge valves. I do. The metering pump 20
The discharge amount can be changed within the range of 0 to 100% by adjusting the eccentricity of the eccentric cam 28.

Further, the disc cam 30 mounted on the other portion of the output shaft of the drive motor 18 operates a micro switch 32 as a switch mechanism by a dog protruding on the outer periphery thereof to rotate the output shaft of the drive motor 18 unit rotation. Each detection signal is transmitted.

FIG. 2 is a control circuit diagram of a fixed-quantity pump driving motor for injecting a chemical solution. That is, the control circuit of the metering pump drive motor provided inside the control panel 16 shown in FIG.
The contact mechanism 13 is connected, and an R1 relay 34 energized by the closing operation of the contact mechanism 13 is connected.
A normally open contacts 36 and 37 are provided to form a two-pole circuit. One R1 a normally open contact 36 is connected in series with a T1 delay timer 38, which is connected to a power supply, and the other R1 a normally open contact 37 is connected. Is connected in series to the PM pump start contact 40 together with one normally open contact 50 corresponding to the common contact 48 of the switching contact 46 provided in the micro switch 32 constituting the switch mechanism and the T1 b timer contact 54 of the T1 delay timer 38. Further, a circuit is constructed by connecting the other normally closed contact 52 of the switching contact 46 directly to the PM pump starting contact 40 in series and connecting to a power supply.

According to the control circuit for the fixed-quantity pump drive motor configured as described above, when the amount of water flowing through the pipe as the water supply system reaches the set flow rate, the integrating flow meter 10 detects this and contacts each unit integrated flow rate. The non-voltage contact signal is transmitted by the closing operation of the reed switch as the mechanism 13, and the R1 relay 34 is energized, whereby the pair of R1a normally open contacts 36,
37 is closed, and the operation of the T1 delay timer 38 is started.

In the initial state of the output shaft when the pump is driven, 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 fixed amount pump driving motor 1
8 is started.

When the dog of the disk cam 30 leaves the Ms1 microswitch 32 due to the rotation of the motor output shaft immediately after the start of the drive motor 18, the switching contact 48 is switched to the normally closed contact 52.
To the constant-pump motor 18
Continues the rotation.

On the other hand, the T1b self-holding timer contact 54 of the delay timer 38 is kept closed until the set time comes. In this case, when the disc cam 30 makes one rotation and the Ms1 micro switch 32 is operated again to switch the changeover switch 48 to the normally open contact 50 and energize, T1
When the set time of the delay timer 38 exceeds the T1b timer contact 54
Is open, the metering pump 20 stops operating there.

Therefore, the set time of the delay timer 38 is set to be longer than the time until the eccentric cam 30 makes one rotation and the Ms1 microswitch 32 shifts to the normally open contact 50 again. In addition, it is possible to easily inject a very high-concentration chemical into a water system by rotating the metering pump several times for one signal transmitted from the integrating flow meter 10 and appropriately changing the set time of the delay timer. Can be.

[0016]

As is apparent from the above-described embodiment, according to the present invention, a relay energized by a closing operation of a contact mechanism provided in an integrating flow meter provided in a main fluid system is provided, A switch mechanism is provided for switching the contacts for each unit rotation of the output shaft of the drive motor for driving the pump,
Providing a pair of normally open contacts that are closed by the bias of the relay, connecting one normally open contact in series with the delay timer to the power supply, and connecting the other normally open contact to one contact of the switch mechanism and the other By connecting the pump start contact in series with the timer contact of the delay timer and connecting this to the power supply, and further connecting the other contact of the switch mechanism directly to the pump start contact in series and connecting to the power supply, ,
The operation of the metering pump is stopped at the timing of the switching operation of the contact point 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 is appropriately proportionally injected using an inexpensive metering pump. The dilution concentration can be changed, so that even if various chemicals are used as the infusion liquid, the dilution concentration can be made to correspond proportionally as appropriate, making it possible to use a wide range of chemicals, such as sewage treatment and the food industry. It has excellent effects such as becoming. The preferred embodiment of the present invention has been described above. However, the present invention is not limited to the above-described embodiment, and it is needless to say that various design changes can be made without departing from the spirit of the present invention.

[Brief description of the drawings]

FIG. 1 shows an embodiment according to the present invention, and is a system diagram of an automatic dilution and supply device for controlling injection of a liquid into a main fluid system such as a water supply system.

FIG. 2 is a control circuit diagram of a metering pump drive motor that shows one embodiment according to the present invention and controls injection of liquid into a main fluid system such as a water supply system.

[Explanation of symbols]

Reference Signs List 10 water supply system 12 integrating flow meter 13 contact mechanism 14 mixing tank 16 control panel 18 drive motor 20 metering pump 22 discharge pipe 24 suction pipe 26 chemical 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

 ──────────────────────────────────────────────────続 き Continuation of front page (72) Inventor Michiaki Kanno 1-4-1 Komazawa, Setagaya-ku Tokyo

Claims (1)

(57) [Claims] An integrated flow meter having a contact mechanism for performing a closing operation at predetermined flow rates in a main fluid system is provided, and a metering pump for supplying a predetermined amount of liquid to the main fluid system based on the operation of the contact mechanism is provided. In an automatic dilution and supply device configured to supply a predetermined amount of liquid to the main fluid system in proportion to the flow rate, a relay activated by a closing operation of a contact mechanism of an integrating flow meter is provided, and a metering pump is driven. A switch mechanism for switching contacts at every unit rotation of the output shaft of the drive motor to be provided is provided, a pair of normally open contacts that are closed by a bias of the relay is provided, and one of the normally open contacts is connected in series with a delay timer. To the power supply, and the other normally open contact is connected in series to the pump start contact together with one contact of the switch mechanism and the timer contact of the delay timer, and is connected to the power supply. The other contact of the structure is directly connected to the pump starting contact in series and connected to a power source, and the relay is energized to activate a delay timer to start the metering pump, to switch the contact of the switch mechanism and to cause the delay. An automatic dilution supply device characterized in that a circuit is configured to stop the operation of the metering pump at a timing set by a timer.