JP7004536B2 - Suction tube and suction tool - Google Patents

Description

The present invention relates to a suction tube and a suction tool.

A device that uses a fluid to create a decompressed state by the Venturi effect and sucks an object is known. For example, an instrument called an aspirator has a T-shaped tube composed of a horizontal tube having a partially thinly formed joint and a vertical tube joined to the joint, and a fluid is poured into one end of the horizontal tube. By ejecting from the other end, the flow velocity of the fluid increases and the pressure decreases in the narrow space of the joint, and the pressure inside the vertical pipe is reduced, so that foreign matter such as liquid and dust is sucked from the tip of the vertical pipe. It becomes possible to do. As the fluid, a liquid such as water or a gas such as air can be used.

Usually, a fluid is poured into an ejector at a large pressure using a compressor or the like (see, for example, Patent Document 1). On the other hand, there may be situations where you do not want to use a large-scale device such as a compressor. For example, when using an air duster that blows off dust on the surface of a computer keyboard or the like, it is desired to suck the blown dust. Since the air duster ejects a gas, it is conceivable that the gas creates a depressurized state and sucks dust. Here, when the suction tool is simply configured by using an air duster, the pressure for blowing out the gas is not sufficiently large, so that it is necessary to devise an effective decompression state.

Japanese Unexamined Patent Publication No. 2011-218866

An object of the present invention is to provide a suction tube for sucking foreign matter such as dust using an air duster and a suction tool provided with the suction tube.

The suction tube body of the present invention is located between the outer tube, the inner tube that is inserted from one end of the outer tube and the tip is positioned in the body of the outer tube, and the one end of the outer tube and the tip of the inner tube. It is characterized by comprising a suction pipe having one end joined to the joint portion of the outer pipe to communicate with the outer pipe.

According to this, when gas is poured into the inside from the base end of the inner pipe, the gas flows at high speed in a narrow space inside the inner pipe, and flows out from the tip of the inner pipe into the body of the outer pipe, and is a wide space of the body. Flows at low speed, and flows out from the other end of the outer tube. At this time, since the pressure near the tip of the inner pipe in the outer pipe drops with respect to the other end side of the outer pipe, the suction pipe communicating with the outer pipe at the joint located from the tip of the inner pipe to one end side of the outer pipe. By generating a negative pressure at the other end, suction can be performed using a suction tube.

The suction tube body of the present invention is characterized in that the separation distance between the tip of the inner tube and the joint portion is three times or more the inner diameter of the outer tube.

According to this, the tip of the inner tube is located at a position separated from the suction tube by at least 3 times the inner diameter of the outer tube, and the gas ejected from the tip is sure to flow to the outer tube without flowing to the suction tube. .. The suction tube can be effectively depressurized.

The suction tube body of the present invention is characterized in that the inner diameter of the inner tube is one half or less of the inner diameter of the outer tube.

According to this, the flow velocity of the gas ejected from the tip of the inner pipe becomes large, and the decompression can be effectively generated.

The suction tube body of the present invention is characterized in that the suction tube is inclined toward the insertion point of the inner tube rather than perpendicular to the outer tube at the joint portion.

According to this, foreign matter such as dust sucked from the suction pipe is sent to the outer pipe without mooring the joint.

The suction tube body of the present invention is further provided with a filter that closes the other end of the outer tube.

According to this, foreign matter such as dust contained in the gas sucked from the suction pipe and flowing through the outer pipe can be removed.

The suction tool of the present invention is characterized by comprising the suction tube body of the present invention and an air duster attached to the base end of the inner tube.

According to this, foreign matter such as dust can be sucked from the suction pipe by pouring a gas into the inner pipe using an air duster.

According to the suction tube and the suction tool of the present invention, it is possible to suck foreign matter such as dust by using an air duster.

FIG. 1 is a cross-sectional view showing the configuration of a suction tube. (Example 1) FIG. 2 is a diagram showing a suction tool in which an air duster is attached to a suction tube. (Example 1) FIG. 3 is a cross-sectional view showing the configuration of a suction tube. (Example 2)

Hereinafter, examples of the present invention will be described.

FIG. 1 shows the configuration of the suction tube 1. The suction tube 1 is an instrument for sucking foreign matter such as dust using an air duster, and includes an outer tube 2, an inner tube 3, a suction tube 4, and a filter 5. Although the suction tube 1 is designed to suck foreign matter such as dust, it may be used to suck an arbitrary object according to the pressure of the gas ejected by the air duster.

The outer tube 2 is a tubular member for guiding the gas. The outer tube 2 is flexibly molded with an inner diameter D = 5 to 10 mm using, for example, vinyl chloride, fluororesin, acrylic, polycarbonate, or the like. The outer tube 2 is fixedly supported by passing the inner tube 3 described later through the base end (left end in FIG. 1) and closing the base end with, for example, a sealing resin. Further, the outer pipe 2 has a joint portion 2a to which a suction pipe 4 described later is joined to the lower end of the body portion.

The inner pipe 3 is a tubular member that is attached to an air duster and ejects the gas at high speed. The inner tube 3 is rigidly molded with an inner diameter d = 1.5 to 2.5 mm using, for example, vinyl chloride, fluororesin, acrylic, polycarbonate, or the like. The inner tube 3 has a tip (right end in FIG. 1) inserted from the base end of the outer tube 2 into the body of the outer tube 2, that is, between the joint portion 2a of the outer tube 2 and the tip (right end in FIG. 1). Positioned.

It is desirable that the inner diameter d of the inner pipe 3 is smaller than the inner diameter D of the outer pipe 2 (d <D) and is halved or less (d ≦ D / 2). As a result, the flow velocity of the gas ejected from the tip of the inner pipe 3 into the outer pipe 2 becomes large, and the decompression can be effectively generated.

The suction tube 4 is a tubular member for sucking foreign matter such as dust. The suction tube 4 is flexibly molded using the same material as the outer tube 2. The suction pipe 4 communicates with the outer pipe 2 by joining the base end to the joint portion 2a of the outer pipe (located between the base end of the outer pipe 2 and the tip of the inner pipe 3). The separation distance L between the tip of the inner pipe 3 and the joint portion 2a is preferably sufficiently larger than the inner diameter D of the outer pipe 2 (L >> D), and is, for example, three times or more (L ≧ 3D). However, it is desirable that the separation distance between the tip of the inner tube 3 and the tip of the outer tube 2 is also sufficiently larger than the inner diameter D of the outer tube 2. As a result, even when the gas is poured into the inner pipe 3 with a relatively small ejection pressure like an air duster and is ejected from the tip thereof, the gas surely flows to the outer pipe without flowing to the suction pipe. Become. The suction tube can be effectively depressurized.

The filter 5 is a member for sucking foreign matter such as dust sucked from the tip of the suction tube 4 and mixed in the gas. For the filter 5, for example, a non-woven fabric can be adopted. Depending on the size of the foreign matter to be sucked, for example, a mesh-like sheet or a porous sheet having holes having a size of 0.5 mm or less may be used. The filter 5 is fixed by closing the tip of the outer tube 2 with an annular fixing member 2b.

FIG. 2 shows a state in which the suction tube 1 is used, that is, a state in which the suction tool 10 is attached to the air duster 11. The suction tool 10 is configured by attaching the base end of the inner tube 3 of the suction tube 1 to the head portion 11a of the air duster 11. When gas is poured into the inside of the inner pipe 3 from the base end of the inner pipe 3 by the air duster 11, the gas flows at high speed in a narrow space in the inner pipe 3 and flows out from the tip of the inner pipe 3 into the body of the outer pipe 2. It flows at a low speed in a large space of, and then flows out from the tip of the outer tube 2. At this time, since the pressure drops with respect to the tip side of the outer pipe 2 in the space c in the outer pipe 2 near the tip of the inner pipe 3 in the outer pipe 2, the tip of the inner pipe 3 to the base end side of the outer pipe 2 Negative pressure is generated at the tip of the suction pipe 4 communicating with the outer pipe 2 at the joint portion 2a located at. Therefore, by pouring a gas into the inner pipe 3 using the air duster 11, foreign matter such as dust can be sucked from the suction pipe 4.

As described in detail above, the suction tube 1 of the present embodiment is inserted from the outer tube 2, the base end of the outer tube 2, and the inner tube 3 whose tip is positioned in the body of the outer tube 2 and the inner tube 3. A suction pipe 4 having a base end joined to a joint portion 2a of the outer pipe 2 located between the base end of the outer pipe 2 and the tip end of the inner pipe 3 and communicating with the outer pipe 2 is provided. When a gas is poured into the inside from the base end of the inner pipe 3, the gas flows at a high speed in a narrow space inside the inner pipe 3 and flows out from the tip of the inner pipe 3 into the body of the outer pipe 2 to a wide space of the body. Flows at a low speed, and flows out from the tip of the outer tube 2. At this time, since the pressure near the tip of the inner tube 3 in the outer tube 2 drops with respect to the tip side of the outer tube 2, the outside is formed at the joint portion 2a located from the tip of the inner tube 3 to the base end side of the outer tube 2. By generating a negative pressure at the tip of the suction tube 4 communicating with the tube 2, suction can be performed using the suction tube 4.

FIG. 3 shows the configuration of the suction tube 1. Compared with Example 1 (FIG. 1), the angle formed by the outer tube 2 and the suction tube 4 at the joint portion 2a is different. The suction tube 4 is not perpendicular to the outer tube 2 but is inclined toward the insertion point of the inner tube 3. In the figure, an inclination of 60 degrees with respect to the vertical is shown, but the inclination angle is preferably 30 degrees or more.

The gas sucked by the suction tube 4 flows along the white arrow in the figure. In the joint portion 2a, in the first embodiment (FIG. 1), the flow is curved by 90 degrees, but in the present embodiment, the flow is curved by only 30 degrees. The bending angle becomes smaller and the gas flow becomes smoother. It is possible to eliminate the possibility that foreign matter such as dust in the gas is moored at the joint portion 2a.

The suction tube and suction tool of the present invention are suitable for sucking foreign matter such as dust using an air duster.

1 Suction pipe 2 Outer pipe 2a Joint 2b Fixing member 3 Inner pipe 4 Suction pipe 5 Filter 10 Suction tool 11 Air duster 11a Head

Claims (5)

A suction tube used for an air duster that blows off dust on the surface of computer keyboards, etc.
With the outer pipe
An inner tube that is inserted from the base end of the outer tube and whose tip is positioned in the body of the outer tube .
A suction pipe having one end joined to a joint portion of the outer pipe located between the base end of the outer pipe and the tip of the inner pipe and communicating with the outer pipe.
Equipped with
The outer tube is fixed by passing the inner tube through the base end and closing the base end with a sealing resin, and closes the other end of the outer tube on the opposite side to the base end. A suction tube, characterized by further comprising a filter . The suction tube body according to claim 1, wherein the separation distance between the tip of the inner tube and the joint portion is three times or more the inner diameter of the outer tube. 1. The inner diameter of the inner pipe is one half or less of the inner diameter of the outer pipe.
Or the suction tube according to 2. The invention according to any one of claims 1 to 3, wherein the suction tube is inclined toward the insertion point of the inner tube rather than perpendicular to the outer tube at the joint portion. Suction tube. The suction tube according to claim 1 and
An air duster attached to the base end of the inner pipe,
A suction tool, characterized by being equipped with.

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