JPS5815630B2 - solenoid driven pump - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a solenoid-driven pump, and more particularly to a solenoid-driven pump that can be driven not only by internal control pulses from an internal control circuit but also by external control pulses from an external control circuit outside the pump. The object of the present invention is to provide a solenoid-driven pump which can switch to external control pulses after the initial pumping action by internal control pulses, and which has extremely good operability.

The internal control circuit of a conventional solenoid 1 driven pump uses a variable resistor to control the frequency of control pulses.

However, with this variable resistor, even if the pump is configured to receive external control pulses from an external control circuit and supply them to the drive circuit, the internal It was not possible to stop the supply of control pulses to the drive circuit.

Therefore, a separate switch is provided to switch between supplying internal control pulses and external control pulses to the drive circuit.

Therefore, control of the frequency of the internal control pulse and switching between the internal control pulse and the external control pulse must be performed individually, resulting in extremely poor workability.

The present invention is intended to eliminate the above-mentioned drawbacks, and is characterized by an internal control circuit that controls the frequency of internal control pulses by a digital switch, and an external control pulse from an external control circuit and the internal control pulse. and a switching circuit that switches the supply to the drive circuit by determining the input value of the digital switch.

The specific configuration thereof will be explained below according to an embodiment shown in the drawings.

1 is an internal control circuit installed inside the pump and generates internal control pulses; a pulse generator 2 generates a reference pulse; a digital switch 3 inputs data values; and a pulse generator with a frequency determined by the reference pulse and data values. Reference numeral 5 consisting of a frequency synthesizer 4 is an external control circuit outside the pump, which generates external control pulses.

6 is a discrimination circuit that outputs "H" when the data value given by the digital switch 3 is a preset value, and "L" when it is any other value; 7 is the discrimination circuit 6; , a NOT circuit 8, AND circuits 9 and 10, and an OR circuit 11.

Reference numeral 12 indicates a drive circuit that is supplied with the output from the switching circuit 7 and drives the solenoid.

Since the present invention has the above-described configuration, for example, when a preset value is selected from 1 to 15, the digital switch 3 selects one of the values from 1 to 15 as a data value to the internal control circuit. 1, internal control circuit 1
An internal control pulse having a frequency determined by the data value is outputted from the input terminal 9 and applied to one input terminal 9a of the AND circuit 9.

On the other hand, since the input data value is the set value, the discrimination circuit 6 outputs rHJ, and therefore, the output terminal 9c of the AND circuit 9
The internal control pulse is output as is.

At this time, even if the external control pulse from the external control circuit 5 is transmitted, the output of the NOT circuit 8 is rLJ, so the output from the AND circuit 10 is "L", and no external control pulse is output. It is.

Therefore, an internal control pulse is output from the output terminal 11b of the OR circuit 11 and supplied to the drive circuit 12.

Next, the data value input to the digital switch 3 is 0.
．． If it is a numerical value such as 16, the generated internal control pulse is applied to one input terminal 9a of the AND circuit 9, but on the other hand, the discrimination circuit 6 outputs rLJ because the data numerical value is other than the set value. Therefore, the output of the AND circuit 9 is rL
J, and no internal control pulse is output.

At this time, the external control pulse input to one input terminal 10b of the NOT circuit 8 is applied to the output terminal 10c of the AND circuit 10.
will be output as is.

Therefore, an external control pulse is output from the output terminal 11c of the OR circuit 11 and supplied to the drive circuit 12.

Therefore, it is possible to control the frequency of the internal control pulses output from the internal control circuit simply by operating the digital switch 3, and to switch between the supply of internal control pulses and external control pulses to one drive circuit. It has practical benefits, such as being able to be carried out on the side.

Note that the internal control circuit 1 is by no means limited to this embodiment; it is sufficient that the frequency of the internal control pulse can be controlled by the digital switch 3, and the data value input to the digital switch 3 is by no means limited to that of this embodiment. It's not something you can do.

Furthermore, the switching circuit 7 is by no means limited to this embodiment.

As shown above, the present invention provides a method for switching between an internal control pulse from an internal control circuit that controls the frequency of a control pulse supplied to a drive circuit by a digital switch, and an external control pulse from an external control circuit using the digital switch. By simply operating a digital switch, the initial pumping action can be performed using internal control pulses, and then immediately switched to pump discharge control using external control pulses from a remote location. In addition, it has practical effects such as being able to control the pump discharge amount using internal control pulses after switching from external control pulses to internal control pulses, which greatly improves the operability of the pump. .

[Brief explanation of the drawing]

The drawing is a block diagram of a solenoid 1-driven pump according to the present invention. 1...Internal control circuit, 3...Digital switch, 5...External control circuit, 12...
...Drive circuit.

Claims (1)

[Claims] 1. Switching between an internal control circuit that controls the frequency of internal control pulses by a digital switch, an external control pulse from an external control circuit, and the supply of the internal control pulses to a drive circuit is determined by the input value of the digital switch. What is claimed is: 1. A solenoid-driven pump, characterized in that it has a switching circuit that operates by.