JPH1030597A - Blowing air switching device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent lowering of blowing efficiency by preventing generation of turbulence at a blowing air switching device part for riding control machine and the like, thus reducing a blowing loss. SOLUTION: In a valve chamber 22 where extending parts 17, 17 involving a blowing opening formed by crossing them at right angles to straight blowing passages 14, 15 are formed, its middle part is journaled for rotation in the form of a seesaw, so that a plate-shaped valve element 18 of which a windward end 18a is positioned at one end 16a of a blowing port 16 and of which lowered a end 18b is positioned at the inner surface 14a of a blowing passage 14 facing the blowing opening 16a is fitted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ventilation switching device suitable for use as a riding control device for spraying chemicals, fertilizers and the like on crops in paddy fields and fields.

[0002]

2. Description of the Related Art Conventionally, a passenger management machine has been used as one method of spraying a chemical solution, fertilizer, or the like on crops in paddy fields and fields.

[0003] The riding management machine is configured as a three- or four-wheeled free-running vehicle having a chemical solution tank, a granule tank, an engine, a pump, a centrifugal blower, and the like mounted on an upper surface of a gantry constituting an airframe.

[0004] For example, in the case of using both a chemical and a granule, the driver's seat is positioned substantially at the center of the upper surface of the gantry constituting the aircraft in consideration of the balance of the aircraft during running and work and the power transmission mechanism. The boom-type chemical liquid spraying device is provided in front of a boom-type chemical liquid dispersing device and is configured to be movable up and down, and the granule spraying device and the like are provided at the rear.

[0005] Furthermore, the centrifugal blower is provided so as to be able to blow air to each of the spraying devices provided in front of and behind the fuselage.
For air assist for forming an air curtain so that the chemical solution sprayed from the injection nozzle is not diffused more than necessary, and in the granule spraying device, it can be used for blowing and conveying granules and the like. In general, the direction of air blowing is switched by a valve such as simply opening the air blowing side.

[0006]

In the conventional blower switching device, a blower loss occurs such as a turbulent flow due to a change in the inner diameter of the blower or the presence of a steep angle portion, so that the blower efficiency is reduced. There was a problem.

The present invention has been made in view of the above circumstances, and minimizes fluctuations in the inner diameter of a ventilation path in a ventilation switching device, eliminates the presence of a steep angle portion, and prevents the occurrence of turbulence.
An object of the present invention is to provide a blower switching device that reduces blower loss and prevents a reduction in blower efficiency.

[0008]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a valve chamber having a bulged portion provided with a blower port at right angles to a straight blower passage. By being pivotally supported and rotated in a seesaw shape, a plate whose wind upper end is located on one side of the blower port and whose wind lower end is located on the inner side surface of the blower path facing the blower port A valve body is provided, and preferably, the wind upper end of the plate valve body is in the same direction as the air blowing port during the seesaw-shaped rotation operation, and the wind lower end is in the same direction as the inner surface of the air blowing path. It is configured to be bent such that

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic overall perspective view of a passenger management machine using an air switching device according to an embodiment of the present invention, FIG. 2 is a longitudinal sectional view of the air switching device according to an embodiment of the present invention, and FIG. FIG. 4 is a perspective view of a plate valve element having a preferred shape.

In the riding management machine using the blower switching device of the present embodiment shown in FIG. 1, a chemical spraying device 2 is provided in front of a gantry 1 constituting an airframe, and a granule spraying device 3 is provided in the rear.
Is provided, and a driver's seat 4 is provided substantially at the center. In the figure, 5 is a chemical tank, 6 is a granule tank, and 7 is a centrifugal blower.

The chemical spraying device 2 provided in front of the gantry 1 is provided with a boom member 8 which can be extended or folded in the left-right direction perpendicular to the running direction, and a jet nozzle 9 is provided on the lower surface of the boom member 8 at an appropriate interval. At the front and rear sides of the plurality of injection nozzles 9, air outlets (not shown) of air blown from the blower 7 by using the aggregate of the gantry 1 as a conduit are provided. Air curtains are configured on both front and rear sides.

Further, the chemical spraying device 2 is supported by a parallel link type lift arm 10 whose one end is pivotally supported on the side surface of the gantry 1, and the lift arm 10 adjusts the height of crops in paddy fields and fields. It is configured so that it can be moved up and down to adjust the ground height.

Further, a granule spraying device 3 for spraying granules is provided behind the gantry 1. That is, although not shown in detail, the granule spraying device 3 uses the air blown from the blower 7 to generate the granule tank 6.
And spray the granules stored therein. That is, the chemical spraying device 2 provided in front of the gantry 1 and the granule spraying device 3 provided in the rear of the gantry 1 are composed of the gantry 1 and a flexible tube. The front blower tube 11 and the rear blower tube 12 are respectively extended and connected.

As shown in FIG. 2, the blower switching device 13 of the present embodiment is provided at a connecting portion between the blower 7 and the front blower tube 11 and the rear blower tube 12. Specifically, a cylindrical front air passage 14 and a rear air passage 15 are provided in a straight line, and an air outlet 16 to which an air outlet 7a of the blower 7 is connected is formed at a right angle above the center of the linear portion. They are provided so as to intersect (orthogonal).

Further, bulging portions 17 are provided on both left and right sides of a connection portion between the front air passage 14 and the rear air passage 15 and the air outlet 16. The bulging portions 17 and 17
An inner space that enables a seesaw-shaped rotation operation of the plate valve element 18 described below is configured.

Next, the bulging portion 17 at the intersection of the front air passage 14, the rear air passage 15 and the air outlet 16,
The intermediate portion is pivotally supported in a valve chamber 22 having the upper end 17 formed therein, and is rotated in a seesaw shape.
Is located on one side 16a of the air outlet 16, and the lower end 18b of the front air passage 14 or the inner surface 14a of the rear air passage 15 facing the air outlet 16,
The plate valve element 18 located at 15a is provided.

In the drawing, reference numeral 19 denotes a support shaft for the plate valve element 18,
20 is a bearing of the support shaft 19, 21 is the support shaft 1
9 is a blower switching lever provided at the outer end of the blower 9 and capable of holding a switching position.

In the embodiment shown in the drawings, the plate valve element 18 is not a mere flat plate, and one end of the plate valve element 18 is provided at one side 16
a, 16b in the same direction, and the other end
Both ends 18a and 18b are bent at 45 degrees in the same direction so as to be in the same direction as the inner surface of the rear air passage 15.

Further, if necessary, a rubber packing may be fitted around the plate valve element 18 to enhance the sealing property between the valve chamber 22 and the inner surface of the valve chamber 22 to prevent air leakage.

The front air duct 14 is connected to the front air duct 14 of this embodiment having the above-described configuration, and the rear air duct 15 is connected to the front air duct 15.
Is connected to the rear blower tube 12, and the blower outlet 16 is connected to an air outlet 7 a of the blower 7.

When air is blown from the blower 7 to the chemical spraying device 2, the switching valve 21 is used to rotate the plate valve element 18 to the state shown by the solid line in FIG. As a result, one end 18a on the windward side of the plate valve element 18
The bulge 1 on an arc centered on the support shaft 19
7 along one side 16a of the air outlet 16
And the other end 18b, which is on the leeward side, is
Is positioned on the inner side surface 14a of the front air passage 14 opposite to the front air passage, the whole is inclined by 45 °, the front air passage 14 side is opened, the rear air passage 15 side is closed, and the front air Ventilation is performed only to the road 14.

In this state, the wind upper end 18a smoothly guides the air blow from the air outlet 16 and the wind lower end 1a.
8b receives the blowing pressure and is closely attached to the flat inner surface 14a of the front blowing path 14, so that the plate valve element 18 is stabilized and the leakage of wind is prevented.

In the case of blowing air from the blower 7 to the granule spraying device 3, the plate valve element 18 is turned in a seesaw shape by the switching lever 21, as shown by a dashed line in FIG. Operation. As a result, one end 18b of the plate valve element 18 is located on one side 16a of the air outlet 16 and the other end 18a is located on the inner side surface 15a of the rear air passage 15 facing the air outlet 16. As a result, the rear air passage 15 is opened, the front air passage 14 is closed, and air is blown only to the rear air passage 15.

In the blower switching device having the above-described structure, a blower opening 16 is provided so as to intersect the straight blower passages 14 and 15 at right angles.
Since the plate valve element 18, which is rotatably operated in a seesaw shape and is rotatably operated in an inclined state, is provided in the crossing portion so as to be able to be switched in an inclined state, the variation in the inner diameter of the air passages 14 and 15 in the switching device can be minimized. At the same time, the generation of turbulence can be prevented by eliminating the steep angle portion, and the blowing loss is reduced, thereby preventing the blowing efficiency from lowering.

It is needless to say that the ventilation switching device of the present invention is not limited to the above-mentioned riding management machine, but can be applied to various ventilation devices.

[0026]

According to the present invention, the occurrence of turbulence is prevented, the blower loss is reduced, and a decrease in blower efficiency can be prevented.

[Brief description of the drawings]

FIG. 1 is a schematic overall perspective view of a passenger management machine in which a ventilation switching device according to an embodiment of the present invention is used.

FIG. 2 is a vertical cross-sectional view of a blower switching device according to one embodiment of the present invention.

FIG. 3 is a sectional view taken along the line III-III in FIG. 2;

FIG. 4 is a perspective view of a preferred plate valve body.

[Explanation of symbols]

 Reference Signs List 14 front air passage 14a inner surface 15 rear air passage 16 air inlet 17 bulging portion 18 plate valve element 18a wind upper end 18b wind lower end 22 valve chamber

Claims (2)

[Claims] 1. A bulging portion (17,17) provided with an air outlet (16) at right angles to a linear air passage (14,15).
An intermediate portion is pivotally supported in a valve chamber (22) in which a 17) is formed and is rotated in a seesaw shape so that an upper end (18a) of the wind (16a) is located on one side (16a) of the air outlet (16). , And the lower end (18b) of the air passage (14) faces the air outlet (16).
A ventilation switching device comprising a plate valve element (18) located in a). 2. A wind end (18a) of the plate valve element (18).
Is in the same direction as the blow port (16) during the seesaw-shaped rotation operation, and the wind lower end (18b) is connected to the blow path (1).
The blower switching device according to claim 1, characterized in that it is bent so as to be in the same direction as the inner side surface (14a) of (4).