JPH08257456A - Blower for air blast sprayer - Google Patents

Abstract

PURPOSE: To provide a blower for air blast sprayer improved in performance and reduced in noise and weight of whole blower by simplifying a hollow external body constituting a wind tunnel of the blower for the air blast sprayer and reducing the suction and discharge resistance of air flow. CONSTITUTION: A wind tunnel cover 23 is constituted of a semicyclic outer peripheral part 23a, a supporting flat plate part at the lower end of the outer peripheral part 23a and a suction bell mouth part 23b recessed-bent to the inside of the rear part of the outer peripheral part 23a. And a discharge bell mouth part 24 is constituted of a front panel 24c, an outer peripheral part 24a bent outwardly and backwardly from the front panel 24c and a cylindrical inner peripheral part 24b bent inwardly and backwardly from the front panel 24c. Further, the hollow external body H for the wind tunnel of the blower 20 is formed by joining and fixing the wind tunnel cover 23 to the discharge bell mouth 24.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blower for a speed sprayer, and more particularly to a hollow outer body for a wind tunnel of a blower used in a spray section of a speed sprayer.

[0002]

2. Description of the Related Art A speed sprayer is a traveling type control machine for blowing and spraying a chemical liquid sprayed from a nozzle with an air flow from a blower. It has a structure in which a spraying section including a nozzle and a blower is arranged. When spraying the chemical liquid with the speed sprayer, the operator sits in the front driver's seat and drives, runs between sprayed objects such as fruit trees, and sucks air from the rear end of the blower away from the driver's seat. At the same time, a chemical solution is sprayed from a nozzle, and the sprayed chemical solution is sprayed by a flow of air from the blower in a direction perpendicular to the traveling direction of the machine body.

By the way, as shown in FIGS. 7 and 8, a blower 20 'of a conventional speed sprayer of this type is generally driven by an internal combustion engine, and is rotatable from a front portion to a cantilevered gear case 27. Output shaft 2 supported
8, a blower fan 21 fixed to the output shaft 28, a wind tunnel 42, a wind tunnel cover 23, a discharge bell mouth 24, a hub cover 25, and a suction port grid 26.
The wind tunnel 42 includes a wind tunnel inner cylinder 42a and a wind tunnel outer cylinder 4a.
2b, and fixed guide vanes 42c, 42c ... Are arranged between the two cylinders 42a, 42b, and the wind tunnel outer cylinder 42b is provided.
Support legs 42 for fixing to the traveling vehicle body 3 on both lower sides of the
d and 42d are provided.

The wind tunnel cover 23 is composed of a semi-circular outer peripheral portion 23a and a suction bell mouth portion 23b which is curved inward of the rear portion of the outer peripheral portion 23a, and its inner end portion 23b ₁
Is superposed on the outer peripheral surface of the rear end 42b ₁ of the wind tunnel outer cylinder 42b of the wind tunnel 42, and is attached and fixed by appropriate means. The discharge bell mouth 24 has a front wall 24c.
And an outer peripheral portion 24a bent outward and rearward from the front wall 24c, and a short cylindrical inner peripheral portion 24b bent rearward inward from the front wall 24c, and a rear end portion 24a of the outer peripheral portion 24a. ₁ is the outer peripheral portion 23a of the wind tunnel cover 23
Is superposed on the outer peripheral surface of the front end portion 23a _{1 and} is attached and fixed by appropriate means, and the rear end portion 24b _{1 of the} inner peripheral portion 24b.
Are superposed on the outer peripheral surface of the front end 42b ₂ of the wind tunnel outer cylinder 42b of the wind tunnel 42, and are attached and fixed by appropriate means.

Then, the wind tunnel outer cylinder 42 of the wind tunnel 42.
b, the wind tunnel cover 23, and the discharge bell mouth 2
A hollow outer body H for a wind tunnel is constituted by three members 4 and 4. When the engine is started and the blower fan 21 is rotated, air is sucked from the suction bell mouth portion 23b of the wind tunnel cover 23 that forms a part of the hollow outer body H and advances in the traveling direction of the machine body. After being guided between the wind tunnel inner cylinder 42a and the wind tunnel outer cylinder 42b of the wind tunnel 42 and coming out to the front of the wind tunnel 42, the blowboard 5a which is the rear wall of the engine room cover 5 It is guided and discharged in a substantially semicircular shape in a direction perpendicular to the traveling direction of the machine body.

[0006]

By the way, as described above, in the conventional speed sprayer blower 20 ', the hollow outer body H for guiding and guiding air is composed of three members. As the number of points increases, it takes labor to assemble, and the suction bell mouth portion 23b of the wind tunnel cover 23 is superposed on the outer peripheral surface of the rear end 42b ₁ of the wind tunnel outer cylinder 42b of the wind tunnel 42. Since it is attached and fixed, the end face of the rear end 42b ₁ of the wind tunnel outer cylinder 42b becomes a resistance against the flow of air when inhaling air, which causes disturbance in the intake air flow. However, there is a problem that the air blowing performance is deteriorated and a noise is generated due to the turbulence of the air flow.

The wind tunnel 42 has support legs 42d, 42
Since the entire blower 20 including the hollow outer fuselage H is supported on the vehicle body 3 by the support legs 42d, 42d, a dedicated support leg is required, and And the weight of the supporting leg 4 increases.
In order to mount and fix 2d and 42d on the vehicle body 3 of the speed sprayer, it is necessary to perform processing such as providing cutouts 23c at the left and right lower ends of the outer peripheral portion 23a of the wind tunnel cover 23.

The present invention has been made in view of the above problems, and its object is, in particular, to simplify the structure of the hollow outer body which constitutes the wind tunnel of the blower of a speed sprayer, and to provide an air flow. Inhalation and discharge resistance of
It is an object of the present invention to provide a blower for a speed sprayer which can improve the blower performance and reduce noise, and can reduce the weight of the blower as a whole.

[0009]

In order to solve the above problems, a blower for a speed sprayer of the present invention comprises a blower fan, a wind tunnel inner cylinder, a wind tunnel cover, a discharge bell mouth, and a fixed guide vane. , The wind tunnel cover is composed of a semicircular outer peripheral portion, a supporting flat plate portion at the lower end of the outer peripheral portion, and a suction bell mouth portion concaved inward of the rear portion of the outer peripheral portion, and the discharge bell mouth is A front wall, an outer peripheral portion that is bent rearward outward from the front wall, and a cylindrical inner peripheral portion that is bent rearward inward from the front wall, and the wind tunnel cover and the discharge bell mouth It is characterized in that a hollow outer body for a wind tunnel is configured by joining and fixing.

Further, a joining portion between an inner end portion of the suction bell mouth portion of the wind tunnel cover and a rear end portion of the cylindrical inner peripheral portion of the discharge bell mouth is a rear end portion of the cylindrical outer peripheral portion. Is superposed on the outer peripheral surface of the inner end portion of the inhalation bell mouth portion, or the rear end portion of the cylindrical outer peripheral portion and the inner end portion of the inhalation bell mouth portion are butted against each other.

[0011]

[Operation] The blower of the speed sprayer according to the present invention configured as described above has the hollow structure including two members, the wind tunnel cover and the discharge bell mouth, when the speed sprayer is assembled to the vehicle body. After fixing and fixing the fixed guide vanes and the wind tunnel inner cylinder to the outer body, the hollow outer body is placed on the vehicle body, and the supporting flat plate portions on both sides of the lower portion of the hollow outer body are mounted on the vehicle body at predetermined positions. Tighten and fix with fixing bolts. The hollow outer body is composed of two members,
Since the mounting and fixing of the blower on the vehicle body is performed by the supporting flat plate portions on both sides of the lower portion of the hollow outer body, the number of parts is small and the assembly is easy, and the blower does not require any special supporting and fixing members. The weight of the blower can also be reduced.

Further, the inner end portion of the suction bell mouth portion of the wind tunnel cover forming the hollow outer body is located more inside than the rear end portion of the cylindrical inner peripheral portion of the discharge bell mouth. As described above, the both end portions are overlapped and fixed to each other, or the rear end portion of the cylindrical inner peripheral portion and the inner end portion of the suction bell mouth portion are butt-joined to each other. In the intake and discharge of the airflow by the airflow, when the airflow passes through the overlapping portions of the both ends, the overlapping portions do not have overflow resistance, and the airflow can pass smoothly and It is possible to improve the blowing performance of the blower without generating a flow and reduce noise.

[0013]

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. FIG. 1 is a perspective view showing the appearance of a speed sprayer to which a blower according to an embodiment of the present invention is applied. 1, a speed sprayer 1 is provided with four front and rear wheels 12, 12 ... At a lower portion of a vehicle body 3, and a driver's seat 2 and a steering wheel 8 are provided on one side of a front portion of the vehicle body 3.
And a chemical liquid tank 4 having a semicircular cross section is installed in the center, and an engine room having a semicircular outer surface which is substantially flush with the outer surface of the chemical liquid tank 4 immediately after the chemical liquid tank 4. An engine room 15 defined by the cover 5 is formed, and inside the engine room 15 for traveling and the blower 20.
A single internal combustion engine (not shown) of the diesel type or the like, which is arranged in the rear for driving and the like, is housed.

At the rear of the engine room 15, there is arranged an axial-flow blower 20 (details will be described later) including a hollow outer body H which constitutes a wind tunnel, and an air outlet is provided between the blower 20 and the engine room 15. 7, a required number of nozzles 6 for spraying the chemical liquid are arranged in a semicircular shape so that the air outlet 7 faces the outside. A pump 11 that pressure-feeds the chemical liquid to the nozzle 6 is arranged near the driver's seat 2, and the chemical liquid sprayed from the nozzle 6 to the outside is blown by the blower 20.
It is diffused by the airflow blown outward from the air outlet 7 at a right angle to the traveling direction of the vehicle body 3, and the chemical liquid is sprayed in an orchard or the like.

2 to 4 show a blower 20 of the present embodiment. FIG. 2 is a vertical sectional view of the blower 20, and FIG. 3 is a wind tunnel of a hollow outer body H constituting a wind tunnel of the blower 20. FIG. 4 is a rear view showing the cover 23, and FIG. 4 is an exploded perspective view of the blower 20. As shown in FIGS. 2 to 4, the blower 20 of the speed sprayer 1 generally includes a blower fan 21, a wind tunnel inner tube 22, a wind tunnel cover 23, a discharge bell mouth 24, a hub cover 25, and an inlet grid 26. And consists of.

The wind tunnel cover 23 has a semicircular outer peripheral portion 23a, and the left and right lower portions of the outer peripheral portion 23a are bent inward to be supported by the vehicle body 3 on the supporting flat plate portion 2.
3c and 23c, and the rear wall portion of the outer peripheral portion 23a is configured as an inhalation bell mouth portion 23b inwardly curved. The discharge bell mouth 24 has a front wall 24c.
And an outer peripheral portion 24a bent outward and rearward from the front wall 24c, and a cylindrical inner peripheral portion 24b bent rearward and inward from the front wall 24c wider than the outer peripheral portion 24a. , The rear end portion 24a _{1 of the} outer peripheral portion 24a
Is a front end portion 23a ₁ of the outer peripheral portion 23a of the wind tunnel cover 23.
The rear end portion 24b ₁ of the inner peripheral portion 24b is superposed on the outer circumference of the suction bell mouth portion 2 of the wind tunnel cover 23 by being joined and fixed by an appropriate means such as welding or blind rivet.
The outer peripheral surface of the inner end portion 23b ₁ of 3b is overlapped and fixed by joining by an appropriate means such as welding or blind rivet. The two members of the wind tunnel cover 23 and the discharge bell mouth 24 form a hollow outer body H that constitutes the wind tunnel outer cylinder of the blower 20 by joining and fixing the two members as described above. ing.

A wind tunnel inner cylinder 22 is disposed in the cylindrical inner peripheral portion 24b of the hollow outer body H, and the wind tunnel inner cylinder 2 is provided.
2, the inner ends of a large number of fixed guide vanes 22c, 22c ... Are fixed at appropriate intervals.
The outer ends of 22c ... Are attached and fixed to the inner peripheral surface of the cylindrical inner peripheral portion 24b of the hollow outer body H. Inside the cylindrical inner peripheral portion 24b of the hollow outer body H, the blower fan 21 is arranged behind the large number of fixed guide vanes 22c, 22c ... And the blower fan 21 has a rotation output shaft 28.
It is fastened and fixed to the end flange portion 28a by a fastening bolt 29. The rotation output shaft 28 is rotatably supported by a gear case 27 extending in a cantilever manner from the front engine room 15 toward the rear.

Assembling of the blower 20 constructed as described above to the vehicle body 3 of the speed sprayer 1 is carried out in the hollow outer body H made up of two members of the wind tunnel cover 23 and the discharge bell mouth 24. Fixed guide wing 22
After attaching and fixing c, 22c ... And the wind tunnel inner cylinder 22,
The hollow outer body H is mounted on the vehicle body 3 from the rear portion of the vehicle body 3. At this time, the gear case 27 protruding cantilevered rearward from the engine room 15 is
The hollow outer body H is moved toward the front of the vehicle body 3 so that the gear case 27 is inserted into the wind tunnel inner cylinder 22, and the hollow outer body H is moved to a predetermined position. At the position, the support flat plate portions 23c, 23c on both sides of the lower portion of the hollow outer body H are fastened and fixed to the vehicle body 3 with a fixing bolt (not shown) or the like.

Thereafter, the blower fan 2 is attached to the rotary output shaft 28 projecting further rearward from the gear case 27.
1 is spline-fitted, and both are tightened and fixed by the tightening nut 29. In this way, the blower 20 for the vehicle body 3
Is placed and supported by the supporting flat plate portions 23c, 23c on both sides of the lower portion of the hollow outer body H,
It is possible to reduce the number of parts and reduce the weight of the blower 20 without requiring any special support / fixing member for the blower 20.

Next, the operation of this embodiment thus constructed will be described. In spraying the chemical liquid, an internal combustion engine (not shown) arranged in the engine room 15 of the speed sprayer 1 is started to drive the vehicle body 3, and the internal combustion engine allows the gear case 27 for the blower 20 to rotate. The rotation output shaft 28 supported is speed-changed to an appropriate rotation speed and rotationally driven. The rotation of the rotation output shaft 28 causes the blower fan 21 to rotate,
Air is sucked in from the rear of the blower 20. The sucked airflow is guided to the suction bell mouth portion 23b inside the hollow outer body H, passes through a plurality of blades 21a of the blower fan 21, and is blown into the hollow outer body H. After being sent under pressure to the wind tunnel portion L where a large number of fixed guide vanes 22c, 22c ... Are arranged, after passing through the wind tunnel portion L, the blowboard 5a, which is the rear wall of the engine room cover 5, moves in the traveling direction of the airframe. By turning to the right angle direction,
The air is discharged to the outside in a substantially semicircular shape from the air outlet 7 that is opened in a substantially semicircular shape.

At this time, the chemical liquid sprayed from the nozzle 6 to the outside is diffused by the air flow discharged from the air outlet 7 of the blower 20 to spray the chemical liquid. The inner end portion 23b ₁ of the suction bell mouth portion 23b of the wind tunnel cover 23 that constitutes the hollow outer body H is located on the inner peripheral side of the rear end portion 24b ₁ of the inner peripheral portion 24b of the discharge bell mouth 24. Since both ends 23b ₁ and 24b ₁ are superposed so as to be positioned and joined and fixed by an appropriate means such as welding or blind rivet, when the air flow is sucked and discharged by the blower 20, the air flow is When passing the overlapping portion of both ends 23b ₁ and 24b ₁ ,
The superposed part does not have flow resistance, the air flow can pass smoothly, turbulence is not generated, the blowing performance of the blower 20 is improved, and noise is prevented.

Although the blower of the speed sprayer according to one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and does not depart from the spirit described in the claims. , And can be changed to various other configurations. For example, the inner end portion 23b ₁ of the suction bell mouth portion 23b of the wind tunnel cover 23 and the inner peripheral portion 24 of the discharge bell mouth 24 which constitute the hollow outer body H are formed.
As shown in FIG. 5, the joint with the rear end 24b _{1 of the} b is butt-joined as shown in FIG. 5, and a strip-shaped support plate is formed on the outer periphery of the joint across both ends 23b ₁ and 24b _1. It is also possible to attach 24d together and fix it by a fixing means such as welding or a blind rivet. In this case, the both ends 2
The joint portions of 3b ₁ and 24b ₁ are flat surfaces without steps, and when the sucked air flow is guided to the smoothly curved suction bell mouth portion 23b and sucked into the blower fan 22, a flow path is formed. As there is nothing that is flat and obstructive, there is no turbulence in the air flow and it is sucked in smoothly,
Further improve the blowing performance.

Further, as shown in FIG. 6, the wind tunnel cover is
Inner end portion 23b of outer peripheral portion 23a of 23 ₁ And the discharge bellma
The rear end portion 24b of the inner peripheral portion 24b of the mouse 24₁ Joining with
The fixed guide on the discharge side of the blower fan 22.
It can also be located near the wing 22c. in this case
Is a curved suction port that is the suction unit of the blower fan 22.
On the side of the mouthpiece 23b, the obstacles such as steps against the air flow
Because there is nothing that can happen, there is no turbulence in the air flow and it goes smoothly
It is sucked and the air blowing performance is improved.

[0024]

As can be understood from the above description, in the blower of the speed sprayer according to the present invention, since the hollow outer body forming the wind tunnel is composed of two members, the number of parts can be reduced and the assembly can be performed. Besides, the hollow outer body itself is placed and supported on the vehicle body, so that a separate supporting member is not required and the weight of the blower can be reduced. Further, since the members of the air passage portion of the hollow outer body are fixedly joined to each other so that flow resistance is not generated, the blowing performance of the blower can be improved and the generation of noise can be reduced.

[Brief description of drawings]

FIG. 1 is a perspective view showing an appearance of a speed sprayer to which an embodiment of a blower according to the present invention is applied.

FIG. 2 is a vertical sectional view of the blower of the embodiment of FIG.

FIG. 3 is a rear view showing a wind tunnel cover of a hollow outer body of the blower of the embodiment of FIG.

FIG. 4 is an exploded perspective view of the blower of the embodiment of FIG.

FIG. 5 is a partially enlarged cross-sectional view of another embodiment of the hollow outer body of the blower.

FIG. 6 is a partially enlarged cross-sectional view of still another embodiment of the hollow outer body of the blower.

FIG. 7 is a vertical cross-sectional view of a conventional blower.

FIG. 8 is an exploded perspective view of a conventional blower.

[Explanation of symbols]

 H ... Hollow outer body for wind tunnel 1 ... Speed sprayer 20 ... Blower 21 ... Blower fan 22 ... Wind tunnel inner cylinder 22c ... Fixed guide vanes 23 ... Wind tunnel cover 23a ... Semicircular outer peripheral portion 23b ... Intake bell mouth portion 23c ... Support flat plate part 24 ... Discharge bell mouth 24a ... Outer peripheral part 24b ... Cylindrical inner peripheral part 24c ... Front wall

Claims (7)

[Claims] 1. A blower fan 21, a wind tunnel inner cylinder 22, a wind tunnel cover 23, a discharge bell mouth 24, and a fixed guide vane 22.
In the blower 20 of the speed sprayer 1 provided with c, 22c ..., The wind sprayer cover 23 and the discharge bell mouth 24 are joined and fixed to form a hollow outer body H for wind tunnel. Blower. 2. The wind tunnel cover 23 has a semicircular outer peripheral portion 23a and a supporting flat plate portion 23 at a lower end of the outer peripheral portion 23a.
c and 23c, and a suction bell mouth portion 23b that is concave inward of the rear portion of the outer peripheral portion 23a, the discharge bell mouth 24 includes a front wall 24c and the front wall 24c.
The blower for a speed sprayer according to claim 1, wherein the blower comprises an outer peripheral portion 24a bent outwardly and rearward from c and a cylindrical inner peripheral portion 24b bent backward and inward from the front wall 24c. 3. An inner end portion 23b ₁ of the suction bell mouth portion 23b of the wind tunnel cover 23 and the discharge bell mouth 24.
Fixedly joining the rear end portion 24b ₁ of the cylindrical inner peripheral portion 24b has a rear end portion 24b ₁ of the cylindrical inner peripheral portion 24b on the outer peripheral surface of the inner end portion 23b ₁ of the suction bell mouth portion 23b 3. The method according to claim 1 or 2, wherein they are overlapped.
Blower for the described speed sprayer. 4. An inner end portion 23b ₁ of the suction bell mouth portion 23b of the wind tunnel cover 23 and the wind tunnel bell mouth 24.
The joining and fixing with the rear end portion 24b ₁ of the cylindrical inner peripheral portion 24b is performed by abutting the rear end portion 24b _{1 of the} cylindrical inner peripheral portion 24b and the inner end portion 23b ₁ of the suction bell mouth portion 23b, The blower for a speed sprayer according to claim 1 or 2, characterized in that a belt-shaped support plate (24d) is added to the outer periphery of the butted portion. 5. An inner end portion 23b ₁ of the suction bell mouth portion 23b of the wind tunnel cover 23 and the discharge bell mouth 24.
5. The joining and fixing portion of the cylindrical inner peripheral portion 24b and the rear end portion 24b ₁ is located on the suction side or the discharge side of the blower fan 21. Speed sprayer blower. 6. The fixed guide vanes 22 radially arranged in the cylindrical inner peripheral portion 24b of the discharge bell mouth 24.
The blower for a speed sprayer according to claim 1, wherein the wind tunnel inner cylinder 22 is fixed via c, 22c. 7. The speed according to claim 1, wherein the blower fan 21 is attached and fixed to a rotation output shaft 28 which is rotatably supported by a gear case 27 extending cantileverly from the engine room 15. Blower for sprayer.