JPH0779784B2 - Pipe connection device such as vacuum cleaner - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe connecting device such as an electric vacuum cleaner.

2. Description of the Related Art FIG. 6 shows a structure of a connecting portion between an operation pipe 1 and an extension pipe 2 in a conventional vacuum cleaner. Operation pipe 1 is 2
The pipe members 3 and 4 are joined together, and a seal body 5 having a U-shaped cross section and having an open side directed toward the pipe center is sandwiched between them. Further, the extension pipe 2 is fitted in the one pipe member 3 so that the tip end surface thereof comes into elastic contact with one piece of the seal body 5. Reference numeral 6 is a buckle that holds the connection state between the operation pipe 1 and the extension pipe 2.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention In the above-described conventional configuration, the operation pipe 1 has two pipe members.
Since it consists of 3 and 4, insufficient connection between them may cause air leakage. Further, since the tip end surface of the extension pipe 2 is merely elastically contacting one piece of the seal body 5, there is a possibility that the sealing effect of this portion may be uncertain. Particularly in the vacuum cleaner, one piece of the sealing body 5 is displaced toward the upstream side of the air flow due to the negative pressure of the suction air, and the sealing performance is further deteriorated.

The present invention solves such a conventional problem and remarkably enhances the sealing effect of the pipe connecting portion.

Means for Solving the Problems In order to achieve the above object, the present invention provides a first pipe, a second pipe internally fitted to the first pipe, and first and second pipes.
And a seal body made of an elastic material for sealing the joint portion of the second pipe, wherein the seal body is substantially cylindrical and one of which is fixed to the inner peripheral surface of the first pipe via a support tool. And the other side on the side where the second pipe is inserted has a cross section of approximately U
As a letter, the end of the seal body is a free end toward the inner peripheral surface of the first pipe, and the free end is inclined toward the inner peripheral surface of the second pipe.

Operation In the above-mentioned configuration, when the second pipe is inserted into the first pipe by inserting the second pipe, the tip end surface of the second pipe is continuously connected to the substantially U-shaped section of the seal body, and the U-shaped gap is formed. It deforms as it becomes narrower. Therefore, the seal body reliably makes elastic contact with the tip end surface of the second pipe at the above-mentioned substantially U-shaped section, and the free end also makes elastic contact with the inner peripheral surface of the first pipe. Furthermore, when negative pressure of the air flow acts on the U-shaped part and receives a displacement force toward the center of the first pipe, the piercing length with the tip surface of the second pipe is increased. The sealing effect is enhanced.

Example An example will be described below with reference to the accompanying drawings.

The pipe connecting device in the present embodiment is, for example, a connecting portion A between the operation pipe 11 and the extension pipe 12 in the electric vacuum cleaner shown in FIG. 5, a connecting portion B between the extension pipes 12 and 13, and an extension pipe 13. It is used for the connection C between the floor nozzle 14 and the floor nozzle 14.

Details will be described by taking the connection portion A as an example.

1 to 4, a substantially cylindrical seal body 15 made of an elastic material such as rubber is provided as a seal piece 16 having a free end on one side, and the operation pipe 11 on the other side through an annular support tool 17. It is fixed to the inner surface of the. The other side of the seal body 15 and the support 17
Are joined together by the concavities and convexities that are joined together. The seal body 15 is located at a position corresponding to the insertion length of the extension pipe 12 that fits inside the operation pipe 11, and the position is set by a plurality of ribs 18 formed in the longitudinal direction of the inner peripheral surface of the operation pipe 11. To be done. That is, the combined body of the seal body 15 and the support tool 17 is inserted from the front end opening of the operation pipe 11, and is inserted until the support tool 17 contacts the rib 18. Thereafter, the support 17 is fixed to the operation pipe 11 by ultrasonic welding.

By the way, the seal piece 16 of the seal body 15 has a substantially U-shaped cross-section that opens in the outer peripheral direction, and the free end portion 19 of the seal piece 16 is inclined. 20 is the operation pipe 11
It is a buckle that keeps the joined state between the extension pipe 12 and the extension pipe 12, and is movably attached to the outer periphery of the operation pipe 11 via a buckle cover 21.

In the above structure, when the extension pipe 12 is inserted into the operation pipe 11 by inserting the extension pipe 12 into the operation pipe 11, the seal piece 16 of the seal body 15 is elastically contacted with its end face and deformed as the U-shaped interval is narrowed ( (Figs. 3 and 4). At this time, the free end portion 19 also stands upright and elastically contacts the inner peripheral surface of the operation pipe 11. In this way, the elastic contact at the two locations ensures the sealing effect at the joint.

Further, when the electric vacuum cleaner is operated, a negative pressure is generated inside the pipe, and the seal piece 16 of the seal body 15 tends to be displaced toward the pipe center. Then, this displacement force leads to the enhancement of the elastic contact degree of the seal piece 16 to the tip end surface of the extension pipe 12, whereby the sealing effect can be further enhanced.

The inner diameter d ₁ of the support 17 and the seal piece of the seal body 15
If a step is set so that the inner diameter d ₂ of 16 is d ₁ <d ₂ , this step can be used as the immediate surface of the insertion jig to facilitate the insertion of the combined body of the seal body 15 and the support tool 17. be able to.

Further, although the electric vacuum cleaner is taken as an example in the present embodiment, it is needless to say that it can be applied to other fluid devices.

EFFECTS OF THE INVENTION As described above, according to the present invention, not only elastic contact due to the elastic repulsive force of the seal body itself but also deformation of the seal body due to fluid pressure is used to enhance the elastic contact degree. It is possible to obtain a good sealing effect,
Efficient fluid transfer can be performed without leakage.

[Brief description of drawings]

FIG. 1 is a sectional view of a pipe connecting portion showing an embodiment of the present invention,
FIG. 2 is a front view, FIGS. 3 and 4 are sectional views for explaining the operation, FIG. 5 is a side view when applied to an electric vacuum cleaner, and FIG. 6 is a sectional view showing a conventional example. . 11 …… First pipe (operation pipe), 12 …… Second pipe (extension pipe), 15 …… Seal body, 17 …… Supporting tool.

Claims (1)

[Claims] 1. A first pipe, a second pipe internally fitted to the first pipe, and a seal body made of an elastic material for sealing a joint portion of the first and second pipes, The seal body has a substantially tubular shape, one of which is fixed to the inner peripheral surface of the first pipe via a support, and the other of which the second pipe is inserted has a substantially U-shaped cross section. As a pipe connection for an electric vacuum cleaner or the like, the end of the seal body is a free end toward the inner peripheral surface of the first pipe, and the free end is inclined toward the inner peripheral surface of the second pipe. apparatus.