JPH0535028B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a liquid spray nozzle used, for example, when spraying a chemical solution such as fertilizer onto agricultural crops.

(Prior Art) Conventionally, this type of liquid spray nozzle is configured by forming a small-diameter spray hole at the tip of a liquid supply path.
It is designed to be used by being connected to the liquid discharge port of a liquid pumping device with a hose or the like.

(Problems to be Solved by the Invention) In the liquid spray nozzle of the conventional structure described above, since the spray hole and the liquid supply path are always in communication, for example, when spraying is stopped, the liquid spray nozzle When the device falls down due to its momentum, there were problems such as the chemical solution remaining in the liquid supply path leaking out from the spray hole in the form of "drops".

Therefore, in order to solve this problem, a valve seat is provided near the spray hole, and a check valve consisting of a valve body that is biased to close by a spring is provided on this valve seat.
This check valve may be used to shut off the spray hole and the liquid supply path when no spraying is being performed, but if the elastic force of the spring is strong, the pressure loss at the check valve will be large, causing the chemical liquid pumping device to generate high pressure. There is a problem in that an expensive shape must be used, which increases the initial cost and running cost.

On the other hand, if the elastic force of the spring is weak, the pressure of the chemical liquid will force the valve element against the spring receiver, resulting in the valve element blocking the liquid passage, resulting in a problem in that good spraying cannot be performed.

The present invention was proposed in view of the above problems, and
It is an object of the present invention to provide a liquid spray nozzle that prevents liquid passages from being clogged during spraying while eliminating leakage from the spray nozzle.

(Means for Solving the Problems) In order to achieve the above object, the present invention supplies pressurized liquid through a liquid supply path to a spray hole provided at the tip of the liquid supply path, and sprays In a liquid spray nozzle that sprays a mist from a hole, a valve seat is provided in a liquid supply path portion, and a valve body that contacts the valve seat and closes the liquid supply path is provided, and one end of the valve body is received by a spring receiver. The valve seat is biased by a leakage prevention spring with low elasticity, and a liquid passage is formed in the valve body portion on the side of the leakage prevention spring.

(Function) When the liquid spray nozzle is not in use, such as at the end of spraying work, the leakage prevention spring presses the valve body against the valve seat, cutting off communication between the liquid supply path and the spray hole. Even if the nozzle falls down due to some kind of momentum, the liquid remaining in the liquid passage is prevented from leaking from the spray hole.

When liquid is forced through the liquid passage during spraying, this pressure pushes the valve body against the spring receiver against the leakage prevention spring, but the liquid from the liquid passage is not formed on the valve body. Since the liquid is supplied to the spray hole side from the liquid passage, the liquid spray nozzle will not be clogged.

(Example) Hereinafter, an example of the present invention will be described based on the drawings.

Figure 1 is an exploded perspective view of a liquid spray nozzle used for fertilizing vegetable gardens and spraying pesticides;
The figure shows a longitudinal side view of the assembled state, and this liquid spray nozzle 1 is connected via a chemical liquid supply hose 2 to the discharge port of a chemical liquid pressure-feeding pump (not shown) which is far away from the liquid spray nozzle 1. A joint member 3 that communicates with the joint member 3, an air mixture member 6 that is screwed with a nut 5 to a portion near the tip of a liquid supply path 4 formed inside the joint member 3, and an air mixture member 6 that is fixed to the tip of the air mixture member 6. It comprises a spray hole 8 fixed with a nut 7 and a check valve C formed in the liquid supply path 4.

The air mixture member 6 has a small diameter air mixture passage 9 formed therein, and an air introduction hole 10 for introducing outside air is provided in a portion near the check valve C.

Further, the spray hole 8 is fixed by press-fitting a bottomed cylindrical ceramic sleeve 11 into a sleeve holder 12 fixed to the tip of the air-fuel mixture member 6 with a fixing nut 7 so that the spray becomes fan-shaped when viewed from the side. With,
The inner peripheral surface of the bottom of the ceramic sleeve 11 is formed into a spherical shape, and a single "V" groove 13 is bored at the outer peripheral end of the bottom side of the ceramic sleeve 11, thereby forming a through hole 14 in the shape of circular arcs facing each other. (See Figures 2 and 3).

Note that if a "U" groove is used instead of the "V" groove 13, an oval or elliptical through hole 14 can be formed.

In the check valve C, a valve seat forming member 15 is attached to partition the inside of the liquid supply path 4, and a circular through hole 16 is formed in the center of the valve seat forming member 15 to form a valve seat 17. Form this valve seat 1
A bullet-shaped valve body 1 that seats on the hole 7 and closes the through hole 16.
8, the valve body 18 is biased against the valve seat 17 by a leak prevention spring 19 with low elasticity, and a peripheral wall portion of the valve body 18 on the side of the leak prevention spring 19 is cut. Lacking liquid passage 20
is formed.

The reference numeral 21 in the figure is a guide plate sandwiched between the spring receiver 22 that receives one end of the leakage prevention spring 19 and the leakage prevention spring 19. aisle 9
A substantially spherical bulge is formed on the side, and a circular injection hole 23 is bored in the center of the bulge.

The operation of the liquid spray nozzle 1 with a check valve constructed as described above will now be described.

First, when the spraying work is finished, the liquid spray nozzle 1 is
When not in use, the leakage prevention spring 19 presses the valve body 18 against the valve seat 17 and communication between the liquid supply path 4 and the spray hole 8 is cut off. The liquid remaining in the liquid supply path 4 is prevented from leaking out from the spray hole 8 even when the liquid drips down.

When liquid is forcefully fed from the liquid supply path 4 during spraying work, the valve body 18 is pressed against the leakage prevention spring 19 toward the spring receiver 22 due to this pressure. The liquid flows from the liquid supply path 4 formed in the valve body 18 to the guide plate 21.
The air is guided by the spherical inner circumferential surface of the air and is vigorously injected into the air mixture passage 9 from the central injection hole 23.

When the chemical liquid injected into the air mixture passage 9 spreads completely within the air mixture passage 9, a negative pressure is generated in the part of the air mixture passage 9 upstream from this expanded part, and this negative pressure causes the air introduction through hole 10 to Outside air is drawn into the air mixture passage 6.

In this way, the air sucked into the air mixture passage 9 is finely mixed and mixed with the chemical solution, and then
Since the mist is sprayed from the spray hole 8, when the mist is sprayed from the spray hole 8, the particle size of the mist in the part that reaches far and the particle size of the part that is sprayed nearby are almost the same particle size. This allows uniform spraying of the chemical solution.

(Effects of the Invention) As explained above, according to the present invention, a check valve for leakage prevention is provided between the spray hole and the liquid supply path, and when the liquid spray nozzle is not in use, the check valve Even if the spray nozzle falls down due to some kind of momentum, the check valve prevents the chemical solution remaining in the liquid supply path from leaking out from the spray hole. This can be reliably prevented.

Moreover, the elastic force of the leakage prevention spring that constitutes the check valve is weak, so there is almost no pressure loss of the liquid in the liquid supply path due to this elastic force, and there is no need to make the liquid pumping device large and expensive and generate high pressure. Furthermore, since the supply hose does not need to be made expensive and can withstand high pressure, there is an effect that the initial cost and running cost can be reduced.

Furthermore, even when the valve body is pressed against the spring receiver by the pressure of the liquid when using a liquid spray nozzle, the liquid is supplied to the spray hole from the liquid passage formed in the valve body, so the liquid passage is not blocked. There is also the effect that good spraying can always be performed.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention. Figure 1 is an exploded perspective view of a liquid spray nozzle used for fertilizing vegetable gardens and spraying pesticides, and Figure 2 is an assembled view of the liquid spray nozzle. Vertical side view of condition, 3rd
The figure is a front view of the spray hole portion. DESCRIPTION OF SYMBOLS 1... Liquid spray nozzle, 3... Joint member, 4... Liquid supply path, 6... Air mixture member, 8...
Spray hole, 9... Air mixture passage, 13... "V" groove (or "U" groove), 14... Through hole, 17... Valve seat, 1
8...Valve body, 19...Leakage prevention spring, 2
0...Liquid passage, 21...Guide plate, 22...Spring receiver, 23...Injection hole.

Claims (1)

[Claims] 1. A liquid spray nozzle that injects pressurized liquid through a liquid supply path from a spray hole provided at the tip of the liquid supply path, which includes a valve seat in the liquid supply path and a valve seat attached to the valve seat. A valve body is provided that contacts the liquid supply path to close the liquid supply path, and the valve body is urged against the valve seat by a leak prevention spring with low elasticity, one end of which is received in a spring receiver, and the leak prevention spring side is pressed against the valve seat. A liquid spray nozzle with a check valve, characterized in that a liquid passage is formed in the valve body. 2. A liquid spray nozzle is formed by connecting a joint member in which a liquid supply path is formed and an air mixture member in which an air mixture passage is formed at its tip, and a central portion is formed to bulge toward the air mixture passage side, A guide plate with a transparent injection hole in its center is placed between the spring receiver and the leakage prevention spring that is received by the guide plate, and a through hole for air introduction is bored in the vicinity of the guide plate in the air mixture passage. A liquid spray nozzle with a check valve according to claim 1, wherein the liquid spray nozzle is equipped with a check valve. 3 The shape of the through-hole constituting the spray hole is such that a "V" or "U" groove is formed on the bottom outer circumferential surface of a bottomed cylindrical member whose bottom inner circumferential surface is formed into a spherical shape, reaching the spherical bottom inner circumferential surface. 2. The liquid spray nozzle with a check valve according to claim 1, wherein the nozzle is carved in a shape with circular arcs facing each other or in an oval and an elliptical shape.