JPH051336Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention relates to a notification device for a chemical tank installed in, for example, a backpack-powered sprayer, and more specifically, to stop the supply of a chemical liquid into the chemical tank by means of a pump. The present invention relates to a notification device for a chemical liquid tank that can simultaneously stop and stop a notification from a notification means that informs that the chemical liquid tank is filled with a chemical liquid.

[Conventional technology]

In the operation of supplying a chemical liquid into a chemical liquid tank using a pump means in a backpack-powered sprayer, an operator needs to know whether a desired amount of chemical liquid has been supplied into the chemical liquid tank.

In conventional supply work, a worker visually checks the liquid level in the communication pipes whose upper and lower ends communicate with the upper and lower parts of the chemical tank to supply the desired chemical solution into the tank. This is detected and the pump means for supplying the chemical liquid to the chemical liquid tank is manually stopped.

Alternatively, an automatic stop device is provided so that when a predetermined amount of the chemical solution accumulates in the chemical solution tank, the pump means for supplying the chemical solution into the chemical solution tank is automatically stopped.

[The problem that the idea aims to solve]

When visually checking the liquid level in the communication pipe, in the case of a backpack-powered sprayer, the communication pipe is on the back of the worker, so it is difficult to check the liquid level in the chemical tank while carrying the backpack-powered sprayer on the worker's back. . In addition, when dismounting the backpack power sprayer and supplying the chemical solution into the chemical solution tank, it is necessary to keep an eye on the liquid level in the communication pipe while the drug solution is being supplied, which is troublesome. Furthermore, when the chemical solution tank is filled with the chemical solution, the drug solution overflows from the drug solution tank.

If the pump means for supplying the chemical solution into the chemical solution tank is a jet pump, and the operator does not notice even if the jet pump automatically stops, the chemical solution will be stopped to generate a jet flow in the jet pump. The pump that feeds the chemical solution from the bottom of the tank to the jet pump continues to operate even after the jet pump is stopped, increasing drive loss.

The purpose of this invention is to provide a notification system that can reliably notify that the chemical liquid tank is filled with chemical liquid, and that can stop the pump means for supplying the chemical liquid to the chemical liquid tank and the notification means at the same time. The purpose is to provide equipment.

[Means to solve the problem]

This invention will be explained using reference numerals in the drawings that correspond to the embodiments.

The notification device in the chemical solution tank 1 of this invention is as follows.
It has the constituent elements (a) to (e).

(a) Liquid level detector 30 that detects when the liquid level in the chemical liquid tank 1 has exceeded a predetermined value (b) Pump means 17 for supplying the chemical liquid into the chemical liquid tank 1 (c) Displaced pump means 17 (d) From the displacement of this operating member 23, the pump means 17
Pump operation detector 4 that detects the operation and stop of
4 (e) It is controlled based on the detected values of the liquid level detector 30 and the pump operation detector 44, and a notification sound is generated when the liquid level in the chemical liquid tank 1 exceeds a predetermined value and the pump means 17 is operating. Reporting means 4
3. The pump means 17 may be a jet pump 17. In that case, the operating member 23 operates a passage 24 that guides the chemical solution, which is the jet flow source of the jet pump 17, from the lower part of the chemical solution tank 1 to the jet pump 17.
It is said to be an opening/closing knob 23 that opens and closes.

The chemical liquid tank 1 may be mounted on a backpack power sprayer.

When using the jet pump 17, it is advantageous for the opening/closing cock 23 to be provided integrally with the jet pump 17.

[Effect]

When supplying the chemical liquid into the chemical liquid tank 1, the operating member 23 is placed in the operating position of the pump means 17. By the operation of the pump means 17, the chemical liquid is pumped into the chemical liquid tank 1.
supplied within. When the chemical solution tank 1 is almost filled with the chemical solution, the liquid level detector 30 detects this, and the notification means 43 generates a notification sound. Know that you are fulfilled within.

Next, the operator displaces the operating member 23 to the stop position to stop the pump means 17, thereby stopping the supply of the chemical liquid into the chemical liquid tank 1. Further, the pump operation detector 44 detects the stoppage of the pump means 17 from the displacement of the operating member 23, and thereby the notification means 43 stops generating the notification sound.

〔Example〕

An embodiment of this invention will be described below based on the accompanying drawings.

Figure 1 is a schematic piping diagram of a backpack power sprayer equipped with a chemical tank notification device according to this invention, Figures 2 and 3 are partially enlarged sectional views of the same sprayer, and Figure 4 is the same. This is a wiring diagram of the main parts of the device.
Reference numeral 1 denotes a chemical liquid tank disposed on a frame (not shown) that can be carried on the back with a backpack strap, and a container-shaped tank body 2 in which the chemical liquid in the chemical liquid tank 1 is stored.
The first port 71 of the three-port three-way tank 7 is connected to the water inlet 3 formed at the bottom of the tank body 2 and the water inlet 4 formed in the side wall slightly above the bottom through pipes 5 and 6, respectively. and the second port 72 . The third port 73 of the three-way pot 7 is connected via a conduit 9 to an inlet 81 of a power sprayer 8 that pumps the chemical solution in the tank body 2 . The discharge port 82 of the power sprayer 8 is connected to the joint 1
It is connected to a nozzle 14 for spraying a chemical solution, which is equipped with an opening/closing pot 13, through a pipe line 11 and a discharge hose 12, which can be divided at 0.0. Incidentally, reference numeral 83 denotes a water outlet of a pressure regulating valve of the power sprayer 8, and the water outlet 83 is connected to the bottom of the tank body 2 via a pipe line 15. Further, a communicating tube type chemical liquid amount indicator 16 is disposed on the side wall of the tank body 2.

As shown in FIGS. 5 and 6, an ejector pump (jet pump) 17 serving as pumping means is mounted on the ceiling of the tank body 2. As shown in FIGS. Note that the jet pump 17 connects the sub suction port 171 to the discharge port 1.
Due to the ejector action due to the fluid flow to 72,
Fluid is sucked through the main suction port 173 and injected into the tank body 2 via the discharge port 172. Further, a flange 174 is provided at the lower end of the ejector pump 17.
is formed, and a male threaded portion 175 is formed below the flange 174, and the male threaded portion 175 is inserted into the tank body 2 through the hole 2a, so that a space between the flange 174 and the ceiling wall 2b of the tank body 2 is formed. Ni Patsukin 17
6 is interposed, a nut 177 is screwed to the male threaded portion 175, and the ceiling wall 2 is connected to the flange 174.
The ejector pump 17 is attached to the tank body 2 by sandwiching b.

The main suction port 173 of the jet pump 17 is connected to a pipe line 19 that can be divided at the joint 18.
It is connected via a water absorption hose 20 to a chemical liquid mixing tank 21 that mixes the chemical and water. Note that 22 at the end of the water absorption hose 20 is a strainer. Also,
The auxiliary suction port 171 of the jet pump 17 is connected to a conduit 24 in which a chemical solution supply pot 23, which is an operating member, is installed.
and the outlet 8 of the power sprayer 8 by a conduit 11.
2.

A detection member 30 is disposed in the tank body 2. That is, as shown in FIG. 2, the detection member 30 is a threaded portion formed at the upper end of a vertically long cylindrical guide member 31 via a stepped portion 32, which is disposed in the upper part of the tank body 2. 33 is penetrated outward from a through hole 34 formed in the ceiling wall 2b of the tank body 2, and is inserted between the step portion 32 and a nut member 35 screwed to the threaded portion 33 of the through hole 34. By pinching the edges, the guide member 31 is suspended from the ceiling wall 2b. And guide member 3
A reed switch 36 is disposed within the cylinder 1, and wiring 37 of the reed switch 36 is extended outward via a metal fitting 38 screwed to the upper end opening of the guide member 31. Further, a ring-shaped float 39 floating on the chemical liquid is disposed outside the cylinder of the guide member 31 so as to be movable up and down.
A disk-shaped stopper 40 attached to the lower end of the guide member 31 prevents the guide member 31 from falling off. A reed switch 36 is installed on the inner circumference of the float 39.
A ring-shaped magnetic body 41 is attached for opening and closing operations.

As shown in FIG. 4, a power supply 42, a notification means 43 such as a buzzer or a lamp, the reed switch 36, and a stop switch 44 which is a pump operation detector are arranged in series to form an electric circuit 45. Here, the reporting means 43 is mounted above the tank body 2 by a mounting plate 46, bolts and nuts 47, as shown in FIG. In addition, the stop switch 44 may be one in which the ejector pump 17 and the chemical solution supply pot 23 are provided separately, as shown in FIG. 3, or in another embodiment, as shown in FIGS. In the case where the pump 17 and the chemical solution supply pot 23 are integrally formed, the lever 231 of the drug solution supply pot 23 is moved directly or by detecting the protrusion 232 of the lever 231 in the opening direction. When operated, the stop switch 44 is closed and the lever 231 is closed.
When the switch 44 is operated in the closing direction, the stop switch 44 is opened.

Since the device of this invention is as described above, the chemical solution can be injected into the chemical solution tank 1 by the following operation.

(1) Connect the three-way connector 7 to the 1st port and the 3rd port 73
and the second port 72 is closed.

(2) Close the chemical solution supply pot 23 and the opening/closing pot 13, respectively.

(3) Put the water absorption hose 20 into the chemical mixing tank 21.

(4) Inject a small amount (1 to 2) of the chemical solution into the chemical solution tank 1 in a separate container.

(5) Start the power source and drive the power sprayer 8.
Then, a small amount of the chemical liquid in the chemical liquid tank 1 is absorbed into the suction port 81 of the power sprayer 8.

(6) Open the chemical solution supply pot 23. Then, since the stop switch 44 is closed and the opening/closing pot 13 is closed, the chemical liquid sucked into the power sprayer 8 is transferred from the discharge port 82 to the secondary of the jet pump 17 via the pipe 11 and the pipe 24. It is fed under pressure to the suction port 171 and drained at high pressure from the discharge port 172. Then, an ejector action occurs in the jet pump 17, the main suction port 173 is made negative pressure, and the chemical liquid in the chemical liquid mixing tank 21 is sucked into the main suction port 173 through the water suction hose 20 and injected into the chemical liquid tank 1. .

(7) When a certain amount of chemical liquid is sucked into the chemical liquid tank 1, the float 39 moves toward the guide member 31 due to buoyancy.
When it reaches the chain double-dashed line (reference line for an appropriate amount to fill the tank body 2) shown in FIG.
6 is considered closed. Then, the stop switch 4
4 is closed, the electric circuit 45 is closed, and the buzzer or lamp serving as the notification means 43 sounds or lights up to notify the operator that the chemical solution tank 1 is filled with the chemical solution. Based on this notification, the operator can manually close the chemical solution supply pot 23 to stop the supply of the chemical solution. Here, chemical solution supply trick 2
3 is closed, the stop switch 44 is opened, the electric circuit 45 is opened, and the notification by the notification means 43 is stopped.

Then, in order to spray the chemical liquid replenished into the chemical liquid tank 1, the following operation may be performed.

(1) The three-way socket 7 is switched to a state where the second port 72 and the third port 73 are in communication and the first port 71 is closed.

(2) With the power sprayer 8 in operation, open the opening/closing knob 13. Then, the chemical liquid in the chemical liquid tank 1 is sprayed from the nozzle 14. and,
When the amount of the chemical solution in the chemical solution tank 1 decreases to the suction port 4 on the side wall of the chemical solution tank 1 by the spraying operation, air is sucked into the power sprayer 8 from the suction port 4, and the spraying is stopped. Then, by performing the above-mentioned injection operation again, the chemical liquid is poured into the chemical liquid tank 1.
It can be injected inside.

[Effect of idea]

In this device, the fact that the chemical liquid tank is filled with the chemical liquid and the operating state of the pump means for supplying the chemical liquid to the chemical liquid tank are detected by the liquid level detector and the pump operation detector, respectively. When the chemical liquid tank is filled with chemical liquid based on the detection signal from the device, a notification sound is generated to notify the operator. Therefore, the operator can know whether the desired amount of chemical liquid has been supplied to the chemical liquid tank without constantly paying attention to the liquid level in the chemical liquid tank by visually checking the liquid level in the communication pipe, etc. This simplifies the work of supplying chemical solutions to.

Furthermore, in the case of a reporting device for the liquid tank of a backpack power sprayer, the operator can conveniently know when the liquid tank is full of liquid while still carrying the backpack power sprayer.

In this device, when the operation member is moved to the stop position in order to stop the operation of the pump means, the pump operation detector detects this and automatically stops the notification from the notification means, making the operation more efficient. Become.

When the pumping means for supplying chemical liquid to the chemical liquid tank is a jet pump, the notification means generates a notification sound to ensure that the operator knows that the chemical liquid tank is full of chemical liquid, and pumps the chemical liquid for jet flow generation from the jet pump into the chemical liquid tank. Since the jet flow generating pump that feeds the jet flow from the lower part of the jet flow is stopped, it is possible to prevent the harmful effect of having the jet flow generating pump continue to operate for a long time even after the jet pump is stopped.

If the opening/closing mechanism for opening and closing the chemical passage for generating the jet flow of the jet pump is integrally attached to the jet pump, the entire system can be made more compact.

In addition, by connecting the pipe joints so as to communicate the chemical liquid tank and the chemical liquid mixing tank,
It is now possible to directly replenish the chemical solution into the chemical tank, and it is safe as there is no scattering of the chemical solution outside the tank during replenishment. There is no need to remove the lid of the chemical solution inlet and add priming water each time, and you can perform a series of tasks from spraying to replenishment while carrying the machine completely on your back, improving work efficiency. Further, the chemical solution replenishment work can be performed even when the machine is lowered from its back.

[Brief explanation of the drawing]

Figure 1 is a schematic piping diagram of a backpack power sprayer equipped with a chemical tank notification device according to this invention, Figures 2 and 3 are partially enlarged cross-sectional views of this sprayer, and Figure 4 is a diagram of this sprayer. Main part wiring diagram of the invented device,
5 and 6 are a front view and a side view of the main parts of a device according to another embodiment of this invention. In the figure, 1... chemical solution tank, 17...
Jet pump (pump means), 23... Chemical solution supply pot (operating member, opening/closing pot), 24... Pipe line (passage), 30... Detection member (liquid level detector), 4
3... Notification means, 44... Stop switch (pump operation detector).

Claims (1)

[Claims for Utility Model Registration] (1) A liquid level detector 30 for detecting that the liquid level in the chemical liquid tank 1 has exceeded a predetermined value, and a pump means 17 for supplying the chemical liquid into the chemical liquid tank 1. ,
an operation member 23 that is displaced to operate the operation and stop of the pump means 17; a pump operation detector 44 that detects the operation and stop of the pump means 17 from the displacement of the operation member 23; and the liquid level detector 30. and a notification means 43 which is controlled based on the detected value of the pump operation detector 44 and generates a notification sound when the liquid level in the chemical liquid tank 1 is equal to or higher than the predetermined value and the pump means 17 is operating. 1. A notification device for a chemical liquid tank, comprising: (2) The pump means 17 is a jet pump 17, and the operating member 23 is an opening/closing knob 23 that opens and closes a passage 24 that guides the chemical liquid, which is the jet flow source of the jet pump 17, from the lower part of the chemical liquid tank 1 to the jet pump 17. A notification device for a chemical liquid tank according to claim 1 of the utility model registration claim, characterized in that: (3) The notification device for a chemical tank according to claim 1 or 2, wherein the chemical tank 1 is mounted on a backpack power sprayer. (4) The opening/closing knob 23 is connected to the jet pump 1.
7. The notification device for a chemical solution tank according to claim 2 of the utility model registration claim, characterized in that the notification device is integrally provided with the tank.