JPS6318792Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an automatic operation device for driving an agricultural pump or the like by an internal combustion engine.

When a pump is driven by an internal combustion engine and liquid is ejected from a nozzle that communicates with the pump's discharge piping, the internal combustion engine is operated continuously, and even when ejection of liquid from the nozzle is temporarily stopped, the internal combustion engine and pump are operated. I'm trying not to stop.

This is because it takes time to start the internal combustion engine, but in this conventional operating method, while the discharge is stopped, the liquid discharged from the pump is repeatedly circulated through the relief valve and returned to the tank. The problem is that the engine continues to operate in a pressurized state, resulting in wasteful fuel consumption and constant noise.

This idea aims to solve the above problems, and starts and stops the internal combustion engine using a signal from a flow switch that detects the flow of liquid in the piping connected to the pump. The present invention provides a pump operating device configured to include an unloading electromagnetic switching valve therein so that the load of the pump is not applied to the internal combustion engine when the internal combustion engine is started.

An embodiment of this device will be described in detail below with reference to the accompanying drawings.

In FIG. 1, reference numeral 1 denotes an internal combustion engine such as a gasoline engine, to which the shaft of a pump 2 is connected, and the internal combustion engine 1 is provided with a starter motor M.

4 is a tank containing liquid such as agricultural chemicals, and pump 2
A filter 5 connected to the suction port is submerged in the liquid.

8 is a discharge pipe connected to the discharge port of pump 2;
A pressure regulating valve 9 and a pressure accumulating chamber 10 are provided in the middle thereof, and a check valve 11 for preventing backflow of liquid from the pressure accumulating chamber 10 to the pump 2 is provided in front of the pressure accumulating chamber 10.

Further, a hose 6 is connected to the tip of the pipe 8 via a flow switch A and an electromagnetic switching valve 7 for unloading, and a manual valve 12 and a nozzle 13 are provided at the tip.

Although any flow switch A may be used, an example thereof is shown in FIG. 2. In this figure, 14 is a main body made of non-magnetic material, with a liquid inlet 15 provided at its lower end and a liquid outlet 16 provided at its side. Reference numeral 17 denotes a valve body provided within the main body 14, which is made of a non-magnetic material and has a permanent magnet 18 fixed to its upper part. Further, this valve body 17 is pushed down by a spring 19 to close the liquid inlet 15.

Reference numeral 20 denotes a proximity switch fixed to one side of the upper part of the main body 14, such as a known reed switch, which closes when the valve body 17 rises and the permanent magnet 18 approaches.

The lead wire of the proximity switch 20 is connected to the controller B so as to transmit the flow signal a to the controller B. The controller B is as shown in FIG. 3, and has an input section 21 for receiving the flow signal a from the flow switch A, an internal timer 22, a control section 23, an output section 24, and a rotation detection section 29. Further, the output section 24 includes a signal circuit 25 for sending a starting signal to the starter motor M for starting the internal combustion engine 1.
, a signal circuit 26 for opening and closing the main switch of the internal combustion engine 1 , an external device control signal circuit 27 , and an opening/closing signal circuit 30 for the electromagnetic switching valve 7 . Note that the rotation detecting section 29 receives a signal b from a rotation detector 3 provided in the internal combustion engine 1.

This invention has the above configuration, and its operation will be explained next.

Initially, it is necessary to store liquid at a predetermined pressure in the pressure accumulation chamber 10, so with the manual valve 12 closed, the main switch of the internal combustion engine 1 is closed using the manual operation circuit.
Electric current is passed through the switching valve 7 to connect the piping 8 to the tank 4 to bring it into an unloaded state, and after turning the starter motor M to start the internal combustion engine 1, the current to the electromagnetic switching valve 7 is cut off to restore it, and the pump 2 is used to restore pressure. Room 1
A liquid at a predetermined pressure is stored inside the tank.

After the liquid at a predetermined pressure is stored in the pressure accumulation chamber 10, the internal combustion engine 1 and the pump 2 are stopped when the manual operation circuit is turned off. There is no risk of it returning.

At this time, the manual valve 12 is closed, and the pressures at the liquid inlet 15 and liquid outlet 16 of flow switch A are equal, so the valve body 17 remains pressed down by the spring 19, and the permanent magnet 18 is also lowered, so the proximity switch 20 remains open.

Next, when the manual valve 12 is opened and the liquid starts to be discharged from the nozzle 13, the liquid pressure at the liquid outlet 16 decreases and the valve body 17
is pushed up by the hydraulic pressure flowing in from the liquid inlet 15 side, and the magnet 18 above approaches the proximity switch 20 and closes it, so that the flow signal a is transmitted to the input section 21 of the controller B.

When a signal enters the input section 21, the control section 23 connected thereto operates, starts the internal timer 22, and outputs a signal from the output section 24 to the signal circuits 25, 26, 27, and 30, which activates the main circuit of the internal combustion engine 1. When the switch is closed, the starter motor M is rotated, the external equipment is activated, and at the same time, current is also sent to the electromagnetic switching valve 7 to start the internal combustion engine 1 in an unloaded state, and the pump 2 starts rotating.

In this way, the internal combustion engine 1 is started, and the rotation speed detected by the rotation detector 3 is sent to the rotation detection section 29 as a signal b, and when it reaches a predetermined value, the rotation detection section 29
9 sends a signal to the control section 23, and the output section 24 operates to send a stop signal to the starter motor M to stop it, cut off the current to the electromagnetic switching valve 7, and return the switching valve 7 to the open state of the discharge pipe 8.

When the manual valve 12 is closed while the pump 2 is operating as described above, the flow of liquid from the liquid inlet 15 to the liquid outlet 16 of the flow switch A in FIG. The magnet 18 moves away from the proximity switch 20 and the flow signal to the controller B stops. Therefore, a stop signal is sent from the input section 21 to the control section 23, a stop signal is output to the signal circuits 26 and 27 of the output section 24, the main switch of the internal combustion engine 1, etc. is opened, and the internal combustion engine 1 is stopped. At this time, since fluid at a predetermined pressure is stored in the pressure accumulation chamber 10, when the manual valve 12 is opened next, the internal combustion engine 1 is immediately started as in the previous case.

As mentioned above, this device is configured so that the internal combustion engine operates only when there is a flow of liquid in the discharge pipe using a controller that is activated by a signal from a flow switch installed in the discharge pipe. Compared to conventional pumps, in which the internal combustion engine and pump continue to operate even when the internal combustion engine and pump are stopped, this system has the advantage of saving fuel for the internal combustion engine, reducing wear and tear on the internal combustion engine and pump, and eliminating unnecessary noise.
In addition, with this invention, when the internal combustion engine is started, the unloading electromagnetic switching valve operates to connect the discharge pipe to the tank, preventing the increase in fluid pressure in the discharge pipe and preventing load from being applied to the pump. This has the effect of making it easier to start the internal combustion engine.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram of the operating device of this invention, FIG. 2 is an enlarged vertical side view showing an example of a flow switch used in the same, and FIG. 3 is a block diagram of the controller. 1... Internal combustion engine, 2... Pump, 7... Solenoid switching valve for unloading, 8... Discharge piping, 10... Pressure accumulation chamber, 12... Manual valve, A... Flow switch, B
……controller.

Claims (1)

[Scope of utility model registration request] In a pump that is driven by an internal combustion engine and has a pressure accumulation chamber in the middle of the discharge piping, the discharge piping of the pump is equipped with an unloading electromagnetic switching valve and a flow switch, and the conditions under which the flow switch detects the flow of liquid in the piping. Then, close the main switch of the internal combustion engine, rotate the starter motor for starting the internal combustion engine,
The electromagnetic switching valve is set to the unload position, and after starting the internal combustion engine, the starter motor is stopped and the electromagnetic switching valve is returned to the discharge pipe opening position. Automatic pump operation device equipped with a controller that opens a switch.