JPH01124499U - - Google Patents

Description

[Brief explanation of the drawing]

The attached drawings show an embodiment of the present invention, in which Fig. 1 is an overall system diagram, Fig. 2 is a time chart, Fig. 3 A and B are explanatory diagrams of the prior art, and Fig. 4 is a time chart of the prior art. In the figure, 1 is an air compressor, 2 is a pipe,
3A to 3d are drain discharge solenoid valves, 4 is a central control system consisting of a sequential timer,
_OSC1 to OSCn are variable frequency oscillators, OSL
is the oscillator selection logic circuit, D is the frequency divider, and OUTSL
is an output selection logic circuit, _E1 to En are drain discharge solenoid valve drive circuits, QA, QB... are frequency divider outputs, C
ONT ₁ to CONTn are control signals to the variable frequency oscillators, f ₁ to fn are frequencies of the variable frequency oscillators, and OUT ₁ to OUTn are outputs to the drain discharge solenoid valves.

Claims (1)

[Scope of Claim for Utility Model Registration] A drain discharge electromagnetic device that opens and closes under timer control is attached to the air compressor and peripheral equipment of the air compressor, such as the receiver tank, aftercooler, and dehumidifier connected to the air compressor. In the automatic drain discharge device, which is provided with a valve, and discharges the drain accumulated in the air compressor and air compressor peripheral equipment to the outside when the drain discharge solenoid valve is opened; A plurality of drain discharge solenoid valves are arranged in an air compressor or air compressor peripheral equipment, and a timer that controls the opening and closing of these plural drain discharge solenoid valves is configured as a central control device consisting of a single sequential timer. . An automatic drain discharge device, wherein the plurality of drain discharge electromagnetic valves are sequentially opened and closed in time by a central control device comprising the single sequential timer. The centralized control device consisting of the single sequential timer receives a frequency input from a plurality of variable frequency oscillators and the frequency variable oscillator selected and operated from among the plurality of variable frequency oscillators,
A frequency divider that outputs an output corresponding to the state at that time after a time determined by the input frequency and the frequency division value;
An output selection logic circuit receives the output from the frequency divider and selects the drain discharge solenoid valve drive circuit to be opened or closed according to the contents of the output; It consists of a plurality of drain discharge solenoid valve drive circuits that are opened and closed, and
an oscillator selection logic circuit for receiving an output from the frequency divider in the above process and selecting a frequency variable oscillator to be operated from among the plurality of frequency variable oscillators according to the input; The device generates an output corresponding to state n, and the output selection logic circuit receives and selects the output in state n, thereby driving the corresponding drain discharge solenoid valve among the plurality of drain discharge solenoid valve drive circuits. Opening and closing the circuit, opening or closing only the drain discharge solenoid valve specifically controlled by the drain discharge solenoid valve drive circuit, and discharging condensate from an air compressor, etc., or stopping condensate discharge; On the other hand, in an oscillator selection logic circuit receiving an output corresponding to the state n from the frequency divider, selecting a variable frequency oscillator corresponding to the output in the state n and operating it;
When the frequency divider receives the frequency of the operating variable frequency oscillator, the output in the state n+1 next to the state n is generated after a time determined by the input frequency and the frequency division value of the frequency divider. , After that, the above operation is repeated to remove one of the plurality of drain discharge solenoid valves.
The drain discharge solenoid valve is opened and closed one by one in time sequence, and the frequency of each variable frequency oscillator of the plurality of variable frequency oscillators is varied in accordance with control requests. An automatic drain discharge device according to claim 1, which is characterized in that the opening period and the opening operation time can be variably controlled.