JPS5951865B2 - sprayer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sprayer used for spraying chemicals in gardening and the like.

A conventional sprayer was constructed as shown in FIG.

That is, 41 contains a liquid containing a drug. A storage container 42 is a sprayer main body to which the storage container 41 is detachably attached, and a pump main body 44 driven by a motor 43 is housed within the sprayer main body 42 . A suction hose 45 is connected to the suction side of the pump body 44, and the lower end of the suction hose 45 is immersed in the liquid in the storage container 41.

46 is a discharge hose connected to the discharge side of the pump main body 44, and a nozzle pipe (not shown) having an opening/closing cock is connected to this discharge hose 46.

In this sprayer, the pump body 44 is driven by energizing the motor 43, so that the liquid in the storage container 41 is sucked up through the suction hose 45 and passed through the discharge hose 46. When the opening/closing cock (not shown) is closed to stop this spraying, the pressure inside the discharge hose 46 will abnormally increase. A reflux valve 47 is provided to release abnormal pressure. Conventionally, this reflux valve 47 is provided at a location separate from the pump body 44, as shown in FIG. If the reflux hose 48 is connected and the lower end of the reflux hose 48 faces the inside of the storage container 41 and the pressure inside the discharge hose 46 rises abnormally, the liquid will be discharged through the reflux hose 48 to the storage container 41. Since the flow is refluxed within the system, the structure is very complicated and the cost is high. The present invention has been made to solve the above-mentioned conventional problems, and the present invention will be described below based on drawings showing embodiments thereof.

In FIG. 1, 1 is a storage container for storing a liquid containing a drug, 2 is a sprayer body to which the storage container 1 is detachably attached, and a pump body 4 driven by a motor 3 is contained in the sprayer body 2. Built-in. 5 is the pump body 4
The lower end of the suction hose 5 is immersed in the liquid in the storage container 1.

6 is a discharge hose connected to the discharge side of the pump body 4;
A nozzle pipe 8 having a sprayer 7 is connected to the end of the discharge hose 6 .

Further, the nozzle pipe 8 is provided with an opening/closing cock 9 in the middle thereof, and has a spray nozzle 10 at its tip. FIG. 2 shows the details of the pump main body 4. Reference numeral 11 denotes a pump case, and a fixing plate 12 for fixing the motor 3 is attached to one end of the pump case 11.

13 is a pinion directly connected to the motor 3; 14 is a pump drive shaft; 15 is a pump gear attached to the pump drive shaft 14;
16 is a drive gear, 17 is a pump cover fixed to the other end of the pump case 11 with screws 18, and this pump cover 17 has a suction portion 21 that communicates with the suction side 19 and the discharge side 20 of the pump gear 15, respectively. and discharge part 2
2, and a suction passage 23 and a discharge passage 24 are formed in the suction portion 21 and the discharge portion 22, respectively.

25 is a packing that seals between the pump case 11 and the pump cover 17, 26 is a shaft seal mounted inside the pump case 11, and 27 is a mounting plate.

Reference numeral 28 denotes a communication part that is located between the suction part 21 and the discharge part 22 and communicates the suction passage 23 with the discharge passage 24. On the suction part 21 side of this communication part 28, there is a valve seat 29;
The reflux valve 3 is biased in a direction in which it is always in contact with the valve seat 29 by the biasing force of the coil spring 30, thereby closing the communication portion 2-8.
1 is provided.

Reference numeral 32 denotes a stopper screwed onto the suction portion 21. The stopper 32 supports the end of the coil spring 30 and has a hole 33 for liquid inflow in the center thereof.

In addition, the suction part 21 and the discharge part 22 of the pump cover 17
A suction hose 5 and a discharge hose 6 shown in FIG. 1 are respectively connected to these. FIG. 3 shows another embodiment of the present invention, in which a reflux valve 31 for opening and closing the communication section 28, a coil spring 30, and a stopper 32 are provided outside the suction section 21. It is something.

In this case, there is no need to provide a hole for liquid inflow in the stopper 32, but the stopper 32 is made liquid-tight to prevent liquid from leaking outward from the stopper 32. . The operation in the above configuration will be explained.

When the switch 34 shown in FIG. 1 is operated to energize the motor 3, the pump body 4 is driven, so that the liquid in the storage container 1 is sucked up through the suction hose 5.
and the pump gear 1 from the suction passage 23 of the pump cover 17.
5 and from the discharge passage 24 of the pump cover 17 through the discharge hose 6 and nozzle pipe 8 to the spray nozzle 1.
Sprayed from 0. This spraying can be stopped by closing the opening/closing pot 9. By closing the opening/closing knob 9, the internal pressure of the pump increases, and when the internal pressure of the pump exceeds a predetermined pressure, the reflux valve 31 is pushed downward against the biasing force of the coil spring 30, and the communication portion 28
to open. Due to this opening, the liquid in the discharge passage 24 flows into the suction passage 23 of the suction part 21, is sucked by the pump gear 15, enters the pump chamber, is pushed out, and flows into the suction passage 23 again from the communication part 28. In this way, the liquid circulates within the pump chamber without returning to the storage container 1. As described above, according to the present invention, a communication section is provided between the discharge section and the suction section of the pump main body, and the communication section is located on the suction section side of the communication section and is biased in a direction that constantly contacts the valve seat. A reflux valve is provided that closes the communication part when the discharge part is overloaded, and when the discharge part side is overloaded, this reflux valve is pushed down to open the communication part and cause liquid to flow back inside the pump chamber. There is no need to separately install piping such as a reflux hose, and it is sufficient to simply connect the suction hose and the discharge hose, which simplifies the piping structure and prevents liquid leakage due to redundant piping. No worries.

Further, according to the present invention, there is no need to separately test the reflux valve performance and pump performance as in the past, and both performances can be checked at the same time.

[Brief explanation of drawings]

FIG. 1 is a side view showing a part of a sprayer according to an embodiment of the present invention in cross section, FIG. 2 is a side sectional view of a pump section in the same sprayer, and FIG. 3 is a side view showing another embodiment of the same pump section. FIG. 4 is a side sectional view showing a part of a conventional sprayer in cross section. 1...Storage container, 3...Motor, 4.
... Pump body, 5 ... Suction hose,
6...Discharge hose, 8...Nozzle pipe,
15...Pump gear (pump chamber), 21...
...Suction part, 22...Discharge part, 28...
...Communication part, 29... Valve seat, 31...
Reflux valve.

Claims (1)

[Claims] 1 A pump body driven by a motor is provided, and this pump body is connected to a suction section to which a suction hose that sucks up liquid in a capacity container is connected, and a discharge hose that discharges liquid from a nozzle pipe. A discharge part is provided, a communication part is provided between the discharge part and the suction part, and the valve seat is located on the suction part side of the communication part and is biased in a direction to constantly contact the valve seat to close the communication part. 1. A sprayer characterized in that a reflux valve is provided, and the reflux valve is pushed down when the discharge section side is overloaded to open the communication section so that liquid flows back inside the pump chamber.