JPH078041Y2 - Discharge rate adjusting device for small amount sprayer - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a discharge amount adjusting device for a small amount spreader, and more specifically, a small amount spreader capable of easily changing the discharge amount without replacing an orifice plate. Of the discharge amount adjusting device.

[Conventional technology]

FIG. 7 is a structural diagram of a conventional spraying device 24 provided in a small amount sprayer for a house. Portions of the present invention which are the same as those of the embodiment described later are designated by the same reference numerals as the embodiment, and the details will be described in the embodiment, and only the essential points will be described. Conventional spout device 24
Then, the orifice plate 84 and the packing 86 are provided at the connection portion between the shaft-shaped portion 50 of the plug 44 and the chemical liquid pipe 54, and when changing the discharge amount of the chemical liquid in the nozzle 42, the connection portion is disassembled to obtain the hole diameter. The orifice plate 84 is different.

Further, in the small amount sprayer disclosed in Japanese Utility Model Publication No. 61-40363, a small-diameter air communication pipe that opens the rear end side to the atmosphere is prepared, and the front end side of the air communication pipe is inside the tapered portion of the hole in the nozzle. The nozzle is inserted from the rear side of the nozzle, and the atmosphere communication pipe is displaced in the axial direction to change the position of the tip side of the atmosphere communication pipe in the tapered portion of the hole in the nozzle. The amount of atmospheric air introduced into the chemical liquid is changed so that the amount of the chemical liquid jetted can be increased while the chemical liquid is jetted from the nozzle in a good spray state.

[Problems to be solved by the device]

In the spray head device 24 of FIG. 7, the connection portion is disassembled and replaced with the orifice plate 84 having a different hole diameter, so that the work of adjusting the discharge amount becomes complicated. Further, since the orifice plate 84 is small and thin, it is easily lost during replacement or storage. Further, if the vertical direction of the orifice plate 84 is wrong, the specified discharge amount cannot be obtained.

With the small amount sprayer disclosed in JP-B-61-40363, the original purpose is to improve the atomization state of the chemical liquid, and the amount of the chemical liquid discharged from the nozzle is adjusted by changing the amount of air introduced from the air communication pipe. In this case, the amount of air introduced to obtain the desired discharge amount of the chemical liquid deviates from the amount of air introduced to obtain the appropriate atomization, the atomization state deteriorates, and eventually, the discharge amount of the chemical liquid from the nozzle is arbitrarily changed. It is easy to make adjustments. Further, since the small-diameter air communication pipe is inserted into the tapered portion in the nozzle, the air communication pipe is clogged due to the sticking of the chemical liquid to the tip of the air communication pipe,
Problems such as sticking of the air communication pipe to the taper portion due to the solidification of the chemical liquid due to the contact between the air and the chemical liquid in the taper portion are likely to occur.

The object of the present invention is to simplify the adjustment of the discharge flow rate while utilizing the advantageous part of the chemical liquid passage as the flow rate adjustment part in the discharge amount adjustment device of the small amount sprayer that requires accurate fine adjustment of the discharge flow rate. It is to improve efficiency.

[Means for Solving the Problems]

The invention will be described using the reference numerals of the drawings corresponding to the embodiments.

The discharge amount adjusting device of the small amount sprayer (10) is provided in the blower section (20) in front of the fan (31) and has a spout body (34) for spouting the chemical liquid. This spout body (34) is Next (a) ~
It has the component (g).

(A) A nozzle (42) for ejecting a chemical liquid (b) A compressed air passage (5) for guiding compressed air for generating a negative pressure for sucking a chemical liquid to the nozzle (42) around the nozzle (42)
6) (c) In the right-angled bending portion (60), the chemical liquid passage (58) (d) radiation direction that extends from the vertical direction to the front where the nozzle (42) extends and guides the chemical liquid from the chemical liquid tank to the nozzle (42) It is equipped with a locking part (74) that protrudes toward the axial direction and the circumferential direction from the rear part of the jet nozzle body (34) and can be displaced. Relatedly, a needle (62) capable of adjusting the flow rate of the chemical liquid in the chemical liquid passageway (58) (e) A biasing member (78) for biasing the needle (62) backward (f) In the axial direction of the needle (62) A plurality of locking recesses (80a-d) are formed at different positions in the rotation direction of the needle (62) to receive the locking portion (74) from the front and limit the displacement of the needle (62) to the rear. g) Protruding forward to partition the locking recesses (80a-d) in the direction of rotation of the needle (62). Off protuberances (8
2) [Operation] In the discharge amount adjusting device of the small amount sprayer (10), the compressed air is guided to the periphery of the nozzle (42) through the compressed air passage (56) and a negative pressure is generated in the nozzle (42). To do. The chemical solution in the chemical solution tank is sucked out by the negative pressure of the nozzle (42), is guided to the nozzle (42) through the chemical solution passageway (58), and is guided to the nozzle (4).
It is ejected from 2), is carried by the wind from the fan (31), and is sprayed from the blower section (20).

When changing the discharge flow rate of the small amount sprayer (10), the needle (62) is axially operated in the rear part of the jet nozzle main body (34) to move the needle (62) forward by the biasing member (78). It is pushed against the force so that the locking portion (74) can cross over the partitioning ridge (82) between the locking recesses (80a-d) in the rotational direction. Then, the needle (62) is rotatably operated in the rear portion of the jet nozzle body (34) so that the locking portion (74) is located at the desired corresponding position of the locking recess (80a-d). Is rotated to move the needle (62) rearward according to the urging force of the urging member (78). Thus, the locking portion (74) is received in the new locking recess (80a-d), and the needle (62) is received in the locking recess (80a-d) in which the locking portion (74) is received. The position of the tip of the needle (62) in the right-angled bending portion (60) of the chemical liquid passage (58) is changed, and the flow rate of the chemical liquid in the chemical liquid passage (58) is changed.

〔Example〕

The invention will be described below with reference to the embodiments shown in FIGS.

FIG. 6 is a perspective view schematically showing the whole of the small amount spreader for a house 10. Wheels 14 are attached to the lower portion of the main body 12, and the main body 12 is movable by manually pushing a handle 16 at the rear portion. The chemical liquid tank 18 stores the chemical liquid and is mounted on the main body 12 together with a compressor (not shown) for generating compressed air. The blower unit 20 is attached via a bracket 22 to the upper portion of the main body 12 so that the vertical and horizontal angles can be adjusted, and the jet nozzle device 24 is detachably attached to the front surface side.

FIG. 5 is a vertical sectional view of the blower unit 20. The motor 26 is fixedly installed in the casing 30 via the stay 28, the axis thereof is aligned with that of the casing 30, and the fan 31 is driven. The pair of mesh bodies 32 are arranged on the front side of the casing 30 and the rear side of the fan 31 in the axial direction, and the peripheral edges are fixed to the casing 30. The spouting device 24 is removably attached to the center of the front side of the front net 32. Due to the rotation of the fan 31, air is sucked in from the rear of the blower unit 20,
Is sent to the front of.

FIG. 1 is a detailed vertical cross-sectional view of the injection nozzle device 24. Spout body
34 is centrally located within the housing 36 and has a body 38
Further, it has a nozzle cap 40, a nozzle 42, and a plug 44 which are sequentially assembled from the rear side of the barrel 38 and are arranged in order from the front side. The cover 46 is applied to the rear surface of the plug 44 and fixed by the screw 47. Shaft 48,50
Linearly extend downward from the body 38, are connected to the compressed air pipe 52 and the chemical liquid pipe 54 at their lower ends, respectively, and are connected to the compressor and the chemical liquid tank 18 via them. The compressed air passage 56 is formed in the shaft-shaped portion 48 or the like, guides the compressed air to the tip of the nozzle 42, and causes the compressed air to flow in the tip direction of the nozzle 42 around the nozzle 42. Chemical passage 58
Is formed in the shaft-shaped portion 50, the plug 44 and the nozzle 42, guides the chemical liquid to the nozzle 42, and changes the direction from the vertical direction to the axial direction of the nozzle 42 at the right-angled bent portion 60 in the plug 44. The needle 62 is inserted into the jet nozzle main body 34 from the rear surface side of the jet nozzle main body 34 so that the center line thereof coincides with that of the nozzle 42, and the tip portion thereof is positioned at the right-angled bending portion 60. Operating part 64
Is formed on the rear end portion of the needle 62, is exposed to the outside of the jet nozzle main body 34, and can be freely rotated and pushed by an operator. O-ring 66 is body 38 and nozzle cap 40
The O-ring 67 is fitted to the inner periphery of the rear end portion of the nozzle 42 and the peripheral portion of the front end portion of the plug 44, and the O-rings 68 and 70 are formed to the inner periphery of the body 38 on both sides of the chemical liquid passage 58. The O-ring 72 is fitted to the fitting portion of the plug 44 and the peripheral portion of the plug 44 so as to fit the inner hole of the plug 44 and the peripheral portion of the needle 62, respectively, and maintains liquid tightness in each portion. The needle 62 includes a spring seat 73 and a locking portion 74 protruding in the radial direction at an axially intermediate portion thereof.
And the spring seat 73 and the locking portion 74 are covers.
It is housed in a recess 76 in 46.

FIG. 2 is a detailed structural diagram of the vicinity of the needle 62. The compression coil spring 78 is fitted on the outside of the needle 62, abuts on the stepped portion inside the plug 44 and the spring seat 73 of the needle 62 at both axial ends thereof, and biases the needle 62 rearward.

FIG. 3 is a perspective view of the needle 62 in the range including the spring seat 73. The pair of spring seats 73 are formed on the needle 62 at a position separated by 180 ° in the circumferential direction, and the locking portion 74 has one spring 73.
It is integrally formed on the rear surface side and protrudes outward in the radial direction from the spring seat 73.

FIG. 4 is a view showing the recess 76 from the axial front side of the needle 62. The locking recesses 80a, 80b, 80c, 80d are formed at 90 ° intervals in the circumferential direction of the needle 62 on the bottom surface of the recess 76, and are partitioned from each other by partitioning ridges 82. Locking recesses 80a, 80
The depths of b, 80c, and 80d from the end surface of the cover 46 on the plug 44 side are gradually reduced in that order, and the locking portion 74 of the needle 62 can be received. The locking portion 74 becomes closer to the nozzle 42 as the receiving destination is changed in the order of the locking recesses 80a, 80b, 80c, 80d.

The operation of the embodiment will be described.

The compressed air is guided from the compressor of the main body 12 to the nozzle head body 34 via the compressed air pipe 52, reaches the vicinity of the nozzle 42 via the compressed air passage 56 in the nozzle head body 34, and the nozzle 42 is provided in the peripheral portion of the nozzle 42. Flowing toward the tip of. As a result, a predetermined negative pressure is generated at the tip of the nozzle 42, and the chemical liquid is sucked out from the chemical liquid tank 18 due to this negative pressure, and the chemical liquid pipe 54 and the plug.
Proceed toward the nozzle 42 through the chemical passage 58 in 44, and
Ejects from 42 in an atomized state. The needle 62 has a chemical passage 58.
The flow cross-sectional area of the chemical liquid passage 58 in the right-angled bent portion 60 is adjusted, whereby the flow rate of the chemical liquid in the chemical liquid passage 58 changes and the discharge amount of the chemical liquid from the nozzle 42 changes.

When changing the discharge amount of the chemical liquid from the nozzle 42, the spouting device 24 is detached from the front net body 32 in the blower unit 20, and the cover 46 is removed.
The operation unit 64 exposed on the rear surface side is operated. In this operation, the operating portion 64 is first pushed slightly into the spray nozzle main body 34 against the compression coil spring 78, and the locking portion 74 of the needle 62 is moved forward by the partitioning ridge 82 in the axial direction of the needle 62. Next, the operating portion 64 is rotated so that the locking portion 74 can rotate over the partitioning ridge 82, and the locking concave portions 80a, 80 can be rotated.
The operating portion 64 is released at the rotational position of b, 80c or 80d, and the locking portion 74 is locked in any of the locking recesses 80a, 80b, 80c and 80d. The locking recesses 80a, 80b, 80c, 80d make the locking portion 74 approach the nozzle 42 in the axial direction of the needle 62 in that order when locking with the locking portion 74, and as a result, the needle 62 The tip portion is displaced to the nozzle 42 side at the right-angled bending portion 60 of the chemical liquid passage 58 (two-dot chain line in FIG. 2), and the flow cross-sectional area of the chemical liquid passage 58 is reduced, whereby the discharge amount of the chemical liquid from the nozzle 42 is reduced. Decrease.

[Effect of device]

 The effects of this device are as follows.

(A) Since the discharge flow rate of the chemical liquid can be adjusted by omitting the disconnection and reconnection of the chemical liquid pipe from the spray head body and the replacement of the orifice plate, the adjustment work can be simplified and made efficient, and the orifice plate is not lost. It can be prevented.

(B) The needle is used instead of the replacement of the orifice plate, but since the right angle bending portion of the chemical liquid passage already existing in the general jet head is used as a portion for adjusting the flow rate of the chemical liquid in the chemical liquid passage by the needle, the chemical liquid passage Can be minimized to avoid structural complications.

(C) The needle can be operated from the rear part of the jet nozzle main body and has good operability.

(D) Rotate the needle from the rear of the jet nozzle body,
Since the locking portion is locked to the desired locking recess and the discharge flow rate of the chemical liquid can be switched among a plurality of stages, it is possible to quickly switch to the desired discharge flow rate.

(E) Since the locking recesses are partitioned from each other by the partitioning ridge, it is possible to prevent the axial position of the needle from being easily switched.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 to FIG. 6 relate to an embodiment of the present invention. FIG. 1 is a detailed vertical cross-sectional view of a jet nozzle device, and FIG. 2 is a detailed structure of a vicinity area around a needle. Fig. 3 is a perspective view of the needle in the range including the spring seat, Fig. 4 is a view of the inside of the recess from the front of the needle in the axial direction, Fig. 5 is a vertical cross-sectional view of the air blower, and Fig. 6 is a house. FIG. 7 is a perspective view schematically showing the entire small amount spraying machine for a house, and FIG. 7 is a structural view of a conventional spraying device provided in the small amount sprayer for a house. 10 …… Small spreader for house (small spreader), 20 …… Blower, 31 …… Fan, 34 …… Spout body, 42 …… Nozzle, 56
...... Compressed air passage, 58 …… Chemical liquid passage, 60 …… Right-angled bending portion, 62 …… Needle, 74 …… Locking portion, 78 …… Compression coil spring (biasing member), 80a-d …… Locking Recessed part, 82 ... Raised part for partitioning.

Claims (1)

[Scope of utility model registration request] 1. A jet head main body (34), which is arranged in front of a fan (31) in a blower section (20) and jets a chemical solution, comprises: (a) a nozzle (42) for jetting a chemical solution; A compressed air passage (56) for guiding the compressed air for generating a negative pressure for sucking the chemical solution to the nozzle (42) to the periphery of the nozzle (42), and (c) a right angle bent portion (60) from the vertical direction in the nozzle (42). ) Of the nozzle (4
2) Provided with a chemical liquid passageway (58) for guiding the chemical liquid from the chemical liquid tank to (2) and (d) a locking portion (74) protruding in the radial direction, which can be displaced in the axial direction and the circumferential direction from the rear portion of the jet nozzle body (34). A needle (62) capable of adjusting the flow rate of the chemical liquid in the chemical liquid passage (58) in relation to its axial position by arranging the tip end portion at the right-angled bending portion (60), (e) the needle A biasing member (78) for biasing (62) backward, (f) A plurality of biasing members (78) are formed in the rotational direction of the needle (62) at different positions in the axial direction of the needle (62), and the locking is performed from the front. A locking recess (80a-d) that receives the portion (74) to limit the displacement of the needle (62) to the rear, and (g) bulges forward and engages in the rotational direction of the needle (62). A partition ridge (82) for partitioning the stop recesses (80a-d) from each other. Discharge amount adjusting device in an amount spreaders.