JPH03219186A - blower pipe - Google Patents

Abstract

PURPOSE:To enable the easy increase of an air quantity and lower or otherwise a noise level by forming a curved diverging section within the first and second pipes separated from each other and extended axially between the front and rear ends of a blower pipe. CONSTITUTION:A blower pipe 1 has a rear end portion 7 connected to the delivery side of a blower, and a front end portion 8 located at the side of a pesticide spray nozzle or the like. The considerable quantity or delivery air from the blower flows from a diverging section 9 within the rear end portion 7 to the inside of diverging sections 4 and 5 within the first and second pipes 2 and 3 concurrently, encountering little resistance. The concurrent flows join together within a flow passage 10 in the front end portion 8. According to the aforesaid construction, a general flow passage area in each portion of the pipe 1 can be made relatively large and an air quantity can be easily increased. Consequently, a blower speed can be kept at a low level, thereby enabling noise reduction.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a blower pipe, and more particularly to a blower pipe for a working machine, which can be easily held and operated by an operator.

Conventional technology In working machines such as backpack-type chemical sprayers and vacuum cleaners, a blower is installed on the backpack carried by the worker, and the air discharged from the blower is guided to a blower pipe held by the worker. The work is carried out by ejecting chemicals together with the air discharged from the machine. Conventionally, in such working machines, the diameter of the blower pipe that the worker holds is determined based on the average hand size of the average person, regardless of the blower's discharge ff1l, and for this reason, the blower pressure cannot be increased too much. Therefore, the increase in the discharge air volume is limited, and there is a drawback that it is impossible to improve work efficiency.

To improve this, a grip is attached to the thick blower pipe that protrudes from the pipe, and the operator holds it while working, but this type of pipe allows the blower pipe to be easily directed in various directions. However, it was difficult to operate the blower pipe, and the blower pipe had the disadvantage of poor operability.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to eliminate the drawbacks of the prior art and to provide a simple and convenient form of pro-vibration.

According to the means for solving the problem, that is, the present invention, the blower pipe for guiding the discharged air from the blower has first and second pipes spaced apart from each other and extending in the axial direction between the front and rear end portions of the professional 7 pipe. providing a pipe portion, forming smoothly curved branch channel portions in the first and second pipe portions, and communicating both branch channel portions with channel portions in the front and rear end portions, respectively;
Further, the first vibrator is characterized by a configuration in which the first vibrator portion is formed to have a cross-sectional shape large enough to be held by an operator.

Therefore, the discharged air from the blower flows from the flow path in the rear end portion of the blower pipe simultaneously with a considerable amount of air through the divided flow paths in the first and second pipe portions with almost no resistance to the flow. , and flow together again in the flow path in the front end portion of the blower pipe, and the operator can operate the blower pipe by grasping the first vibe portion.

Example Next, the present invention will be described based on embodiments shown in the drawings.

FIG. 1 shows a blower pipe 1 according to an embodiment of the present invention. This blower pipe 1 is made of a suitable synthetic resin material by a suitable molding process, and its central portion is formed by a first tube constructed as described below. It consists of a pipe section 2 and a second pipe section 3.

The first pipe section 2 and the second pipe section 3 are spaced apart from each other and extend generally parallel to each other in the axial direction, and a branch channel section 4 is curved extremely smoothly so as not to increase flow resistance.
and 5, respectively, and between the first pipe section 2 and the second pipe section 3, an elongated space 6 in the axial direction is formed with a gap large enough to allow the operator's hand to easily enter. There is. The first vibe part 2 and the second pipe part 3 are
At both front and rear end portions 7 and 8 of the blower pipe 1,
The branch channel section 4 in the first pipe section 2 and the branch channel section 5 in the second vibe section 3 are combined with the channel section 9 in the rear end section 7 and the front end section 8, respectively.
The inner flow path portions 10 merge and communicate with each other.

The first pipe section 2 of the blower pipe 1 is preferably circular in cross-section as shown in FIG. 2 and has an outer diameter such that it can be easily grasped and installed.

Therefore, typically the first pipe section 2 has its axis 0.
It is formed with a circular cross section with a radius of about 20 am.

On the other hand, the second pipe section 3 is similar to the first pipe section 2.
In this embodiment, the second pipe portion 3 has a semicircular cross section with a radius of about 40# from the axis 02, and the cross section of the upper half is parallel to the axis 02. 02 to 20mPi! It is formed with a slightly flattened cross section. Further, the rear end portion 7 of the blower pipe 1 has a radius of 40. The front lii portion 8 is formed to have a circular cross section with a radius slightly smaller than that of the rear end portion 7.

In the blower pipe 1 configured as described above, the rear end portion 7 is connected to the discharge side of a blower (not shown), and the d front end portions 8 are arranged on the side such as the chemical spray nozzle, so that the discharge air from the blower is considerably large. The flow simultaneously flows from the flow path portion 9 in the rear end portion 7 through the flow path portions 4 and 5 in the first and second vibe portions 2 and 3 with a large amount of air, with almost no resistance to the flow, and then flows from the front end. They rejoin and flow within the channel section 10 within the section 8 . In this way, the overall flow path area in each part of the blower pipe 1 can be made relatively large on average, and therefore the air volume can be easily increased, and the rotation speed of the blower can be lowered as the Jl amount increases. In addition, the operator can easily direct the blower pipe 1 in a desired direction by directly grasping the first pipe section 2 that is closer to the center of the airflow, and can also increase the air volume. The shape of the blower pipe 1 can be designed with a relatively wide degree of freedom while maintaining the following.

With the configuration of the present invention as described in detail, the present invention allows the total flow path area in each part of the blower pipe to be relatively large, and therefore, it is possible to easily increase the flow rate.
In addition, since the rotational speed of the valve U7 can be lowered as the Jill increases, the noise during operation can be reduced.Furthermore, the operator can directly hold the first pipe portion closer to the center of the feed lit flow and The blower pipe can be easily directed in a desired direction, and the shape of the blower pipe can be designed with a relatively wide degree of freedom while maintaining an increase in air volume.

[Brief explanation of drawings]

FIG. 1 is a side view of a blower pipe according to the present invention, and FIG. 2 is a sectional view taken along line II--II in FIG. 1... Blower pipe, 2... First pipe part, 3.
...Second pipe part, 4,5,9.10...Flow path part, 7.8...End part.

Claims (1)

[Claims] (1) Blower pipe (1) that guides the discharge air from the blower
), both front and rear end portions (7, 8) of the blower pipe.
first and second pipe sections (2, 3) spaced from each other and extending in the axial direction; smoothly curved branch channel sections (4, 5) within the first and second pipe sections; are formed respectively, and both branch flow path portions are communicated with the flow path portions (9, 10) in the front and rear end portions, and the first
A blower pipe characterized in that the pipe portion is formed into a cross-sectional shape large enough to be grasped by an operator.