JPH01285237A - Pipe connecting device for vacuum cleaner and the like - Google Patents

Abstract

PURPOSE:To improve a sealing effect of a pipe connection, by a method wherein, when a No.2 pipe is inserted into a No.1 pipe, a seal with almost a U-shaped section is elastically made to contact at the top edge of the No.2 pipe and transformed so as to reduce a width of the U-shaped section. CONSTITUTION:When an extension pipe 12 (No.2 pipe) is, in inner fit, inserted into an operating pipe 11 (No.1 pipe), the lip 16 of a seal body 15 is elastically made to contact at the edge of the extension pipe 12, and transformed so as to reduce a width of a U-shaped section. At the same time, the free end 19 of the lip 16 is also erected and elastically made to contact around the inner of the operating pipe 11. Since a pipe connection is thus sealed at two points, it makes sure of its sealing. When a vacuum cleaner is operated, since the inner of the pipes becomes a negative pressure, the lip 16 of the seal body 15 tends to move in inner direction of the pipes. This displacement force makes it stronger that the lip 16 is elastically made to contact at the edge of the extension pipe 12 and it is thus possible to obtain a further higher sealing-effect.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a pipe connection device for a vacuum cleaner or the like.

BACKGROUND ART FIG. 6 shows the configuration of the connecting part between Eve 1 and extension pipe 2 (operation in a conventional vacuum cleaner). Operation pipe "1"
is constructed by joining two pipe members 3 and 4, and a seal body 6 having a 0-shaped cross section and with its open side facing the center of the pipe is sandwiched between them. Also extension pipe 2
is fitted inside one of the pipe members 3 so that its tip end surface comes into elastic contact with one piece of the seal body 6. 6 is a buckle that maintains the connection between the operation pipe 1 and the extension pipe 2.

Problems to be Solved by the Invention In the conventional structure described above, since the operating pipe 1 consists of two pipe members 3 and 4, air leakage may occur if the connection between them is insufficient. Also extension pipe 2
Since the tip surface of the seal member 6 is merely in elastic contact with one piece of the seal body 6, there is a possibility that the sealing effect of this portion may also be uncertain. In the special Kt vacuum cleaner, one piece of the seal body 5 tends to be displaced toward the air flow side due to the negative pressure of the suction air.
The quality of the layer was decreasing.

The present invention solves these conventional problems and significantly improves the sealing effect of pipe connections.

Means for Solving the Problems In order to achieve the above objects, the present invention provides a first pipe, a second pipe fitted inside the first pipe, and a second pipe fitted inside the first pipe.
．． and a seal body made of an elastic material for sealing the joint portion of the second pipe, the seal body having a substantially cylindrical shape,
One of them is fixed to the inner peripheral surface of the first pipe via a support, and the other end on the side into which the second pipe is inserted has a substantially U-shaped cross section and faces toward the inner peripheral surface of the first pipe. The part is the free end.

Function In the above configuration, when the second pipe is inserted into the first pipe by being internally fitted, the tip end surface of the second pipe is elastically connected to the approximately U-shaped cross section of the seal body, and the second pipe is inserted into the first pipe. Transform the space so that it becomes narrower. Therefore, the seal body reliably comes into elastic contact with the distal end surface of the second pipe at the substantially U-shaped section, and the free end also comes into elastic contact with the inner circumferential surface of the first pipe. Furthermore, when the negative pressure of the airflow acts on the approximately U-shaped part and receives a displacement force toward the center of the first pipe, the degree of elastic continuity with the tip surface of the second pipe increases. The sealing effect is further enhanced.

Example Examples thereof will be described below with reference to the accompanying drawings.

The pipe connection device in this embodiment is, for example, an operation pipe 11 and an extension pipe 1 in a vacuum cleaner shown in FIG.
2, the connection B between the extension pipes 12 and 13, and the connection C between the extension pipe 13 and the floor nozzle/L'14.

The details will be explained using the connection part A as an example.

In FIGS. 1 to 4, a substantially cylindrical seal body 1ε made of an elastic material such as rubber has a seal piece 16 having a free end on one side.
The other end is fixed to the inner circumferential surface of the operating pipe 11 via an annular support 17. The other side of the sealing body 16 and the support member 17 are connected to each other by concavities and convexities that connect with each other. The seal body 16 is located at a position corresponding to the insertion length of the extension pipe 12 that fits inside the operation pipe 11, and its position is set by a plurality of lips 18 formed in the longitudinal direction of the inner peripheral surface of the operation pipe 11. be done. That is, the combined body of the seal body 15 and the supporter 17 is inserted through the opening at the tip of the operating pipe 11 until the supporter 17 hits the rib 18 . Thereafter, this support 1a is fixed to the operating pipe 11 by ultrasonic welding.

By the way, the seal piece 16 in the seal body 16 is as follows:
It has a roughly U-shaped cross section that opens toward the outer circumference, and in addition,
Its free end portion 19 is inclined. Reference numeral 2o denotes a buckle that maintains the joined state between the operating pipe 11 and the extension pipe 12, and is movably attached to the outer periphery of the operating pipe 11 via a buckle cover 21.

In the above configuration, when the extension pipe 12 is inserted into the operation pipe 11 while being fitted inside, the seal piece 16 of the seal body 16 comes into elastic contact with the end face thereof, and is deformed as if the U-shaped space is narrowed. (Figures 3 and 4). At this time, the free end portion 19 also stands upright and comes into elastic contact with the inner circumferential surface of the operating pipe 11. In this way, the elastic contact at two locations ensures the sealing effect of the joint.

Further, when the vacuum cleaner is operated, the inside of the pipe becomes negative pressure, and the seal piece 16 of the seal body 16 tends to be displaced toward the center of the pipe. This displacement force is applied to the extension pipe 12
This leads to stronger elastic contact of the seal piece 16 to the tip surface, thereby further enhancing the sealing effect.

Note that if a step is set by setting the inner diameter d1 of the support 17 and the inner diameter d2 of the seal piece 16 in the seal body 16 as d, <d2, this step can be used as a temporary base for the insertion jig, and the seal body 16 and Insertion of the combined body with the support 17 can be facilitated.

Furthermore, although a vacuum cleaner was used as an example in this embodiment, it goes without saying that the present invention can also be applied to other fluid devices.

Effects of the Invention As described above, according to the present invention, not only the elastic contact due to the elastic repulsion of the seal body itself, but also the deformation of the seal body due to fluid pressure is used to strengthen the elastic contact. Must be able to obtain a good sealing effect,
Efficient fluid transfer without leakage is possible.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a pipe connection part 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 a 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...Support. Name of agent: Patent attorney Toshio Nakao and one other person If
f Figure 3 wE4 Figure 5/'1 Figure 6 J Me/

Claims (1)

[Claims] It comprises a first pipe, a second pipe that is internally fitted into the first pipe, and a seal body made of an elastic material that seals the joint portion of these first and second pipes, and the seal body is approximately It has a cylindrical shape, one of which is fixed to the inner circumferential surface of the first pipe via a support, and the other, into which the second pipe is inserted, has a substantially U-shaped cross section and is attached to the inner circumferential surface of the first pipe. A pipe connection device for vacuum cleaners, etc., with the end facing the peripheral surface as a free end.