JPH0547917Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a connecting tube. More particularly, it relates to a connecting tube capable of absorbing vibrations.

The connecting tube of the present invention is used as a transfer tube that is connected to transfer fluid such as gas or liquid between two devices on which vibration is applied.

[Prior Art] Conventional connection tubes include those shown in FIGS. 5 to 7.

The connecting tube 50 shown in FIG. 5 is simply a straight rubber tube, and is fitted onto pipes 50a and 50b protruding from both objects to be connected to connect them.

The connecting tube 51 shown in FIG. 6 has a flange portion 52 formed at the tip of a straight tube body 51a, and is made of an elastic member such as rubber. Normally, the tube body 51 is attached by inserting one end of the tube body 51 into the discharge port 53 of one device and fitting the flange portion 52 to the plate 54 of the other device.

The connecting tube 60 shown in FIG. 7 has a flange portion 62 at one end of an elbow tubular tube body 61.
, which is also made of an elastic material such as rubber. Then, one end of the tube body 61 is inserted into the discharge port 63 of one device, and the flange portion 62 is fitted into a hole in the plate 64 of the other device to be attached.

[Problems that the invention aims to solve] For example, septic tanks and home fish farming pumps must be quiet. For this reason, normally the vibrating parts such as the pump mechanism are suspended from a fixed member such as an air tank with a cushion such as cushioning rubber (34 in Figure 2), and a box-shaped outer case (10a in Figure 2) is used to block the sound. However, there is a problem in that vibrations are transmitted to the air tank through the connection tube that is the ventilation circuit, and the vibrations cannot be absorbed sufficiently and are noisy. In particular, if the connection distance of the connecting tube is shortened in order to downsize the entire vibrating part of a pump or the like, there is a problem in that the silencing effect is not sufficient and the regulation value for noise pollution cannot be cleared.

In the connecting tube 50 shown in FIG. 5, the length of the freely flexible intermediate portion 50c is short;
Poor vibration absorption. Also, connection tube 5 in Figure 6
In No. 1, vibrations can be absorbed by bending the tube body 51a in the direction perpendicular to the axis of the tube body 51a, but it is difficult to bend the tube body 51 in the axial direction, so vibrations can be absorbed sufficiently. The problem is that it cannot be done.

Furthermore, although the connecting tube 60 shown in FIG. 7 can absorb both vertical and lateral vibrations, there is a problem in that it requires a large installation space because it is shaped like an elbow tube.

In view of the above circumstances, it is an object of the present invention to provide a connecting tube that can well absorb vibrations in the axial direction and directions perpendicular thereto, and that requires a small installation space.

[Means for solving the problem] The connecting tube of the present invention is made of an elastic material,
It has a cylindrical tube body and a folded part that is folded back at least one end of the tube body so that the inner peripheral surface faces outward, and a flange part is integrally formed on the outer periphery of the folded part. It is a feature.

[Function] In the present invention, since the folded portion easily bends both in the axial direction of the tube body and in the perpendicular direction thereof, vibrations in both directions can be sufficiently absorbed. Moreover, since it is almost straight-tube in shape, the installation space is small.

[Example] Next, an example of the present invention will be described. Fig. 1 is a cross-sectional view of a connecting tube according to an embodiment of the present invention, Fig. 2 is a cross-sectional front view of a main part of a pump device in which the connecting tube of the present invention is installed, and Fig. 3 is a cross-sectional view of another embodiment. FIG. 4 is a partially sectional front view of the connecting tube, and FIG. 4 is a sectional view of the connecting tube according to still another embodiment.

In FIG. 1, 1 is a connecting tube, 2 is a tube body, 3 is a folded portion, and 4 is a flange portion. The tube body 2 has a straight tube shape, and usually has a circular cross section, but may have a rectangular or other polygonal shape. The folded portion 3 is formed in a shape that is folded back at one end of the tube body 2 so that the inner circumferential surface 3a of the tube faces outward. The flange portion 4 is integrally formed on the outer periphery of the folded portion 3. The flange portion 4 may have any shape as long as it can be easily fitted into a hole of a device to be connected and is difficult to separate from. In this embodiment, a groove 4a is formed to fit into the inner circumferential edge of the plate having holes drilled therein.

The connecting tube 1 as described above may be made of any elastic material, such as various natural rubbers, synthetic rubbers, soft plastics, etc.

The connecting tube 1 can have any inner diameter and length depending on the application, but normally one with an inner diameter of 5 to 30 mm and a length of 10 to 100 mm is adopted. In addition, if the thickness of the connecting tube 1 is too thin, it may expand or break due to the pressure of the transferred fluid, and if it is too thick, it will be difficult to absorb vibrations. Taking into account the usage conditions, the thickness is set to be difficult to damage and easy to absorb vibration.

The connection tube 1 as described above is connected to the folded part 3.
Since it is easy to move in the axial direction of the tube body 2 and also easy to bend in a direction perpendicular to the axial direction, vibrations in all directions can be well absorbed.

Next, connect the connecting tube 1 of the present invention to the pump device 1.
An example applied to 0 will be explained based on FIG. A pump device 10 shown in the figure is an air pump used for supplying oxygen to septic tanks and fish tanks and sampling for pollution monitoring, and is composed of two devices: a diaphragm pump 20 and an air tank 30. The diaphragm pump 20 has a main body 21 and working chambers 22 provided on both sides thereof.
A vibrator 23 is placed in the center of the main body 21, and an electromagnetic coil 24 is provided around it. A diaphragm 25 is attached to both ends of the vibrator 23, and the diaphragm 25 communicates with the suction chamber 22a and the discharge chamber 22b of the working chamber 22. A valve 2 is provided in the suction chamber 22a and the discharge chamber 22b.
6a and a valve 26b are provided to control intake and discharge of air. 27 is a straight pipe-shaped discharge port formed to communicate with the discharge chamber 22b.

Now, when an alternating current is applied to the electromagnetic coil 24, the vibrator 23 reciprocates in synchronization with the alternating current power frequency. The movement of the vibrator 23 causes the diaphragm 25 to
When is moved, air is suctioned from the suction chamber 22a and discharged from the discharge chamber 22b. Since the diaphragm pump 20 shown in FIG. 2 is provided with two working chambers 22, air is alternately discharged from the two discharge ports 27.

The air tank 30 is composed of a casing 31 and a plate 32 that seals the upper surface of the casing 31, and has a built-in mechanism for absorbing pulsation of the supplied air. 33 is a discharge port for supplying air to the outside (for example, a fish tank). The diaphragm pump 20 is mounted on the upper surface of the air tank 30 with a cushioning rubber 34 interposed therebetween.

The connecting tube 1 of the present invention is used to connect the diaphragm pump 20 and the air tank 30. The connecting tube 1 is attached so that the end of the tube body 2 is inserted into the discharge port 27, and the flange portion 4 is fitted into the inner peripheral edge of the hole 35 of the plate 32.

In this embodiment, since the vibrator 23 vibrates at high speed during operation, the diaphragm pump 20 itself also vibrates in the vertical and horizontal directions, but such vibrations are sufficiently absorbed by the folded portion 3 of the connecting tube 1.
Air can be supplied from the diaphragm pump 20 to the air tank 30 without any problems. Note that when using the connecting tube 1 of the present invention, even if the discharge port 27 and the hole 35 on the plate 32 are not completely concentric, that is, if the centers are shifted parallel to each other, or if they are slightly inclined, However, it has the advantage of being easy to install.

Next, other embodiments will be described. The connecting tube shown in FIG. 3 has a tube body 2 with folded portions 3 formed at both ends. This embodiment is suitable when the two devices to be connected both have connection ports with holes drilled in the plates.

The connecting tube shown in FIG. 4 has a bellows 5 formed on the tube body 2. This embodiment has the advantage that vibration absorption is easier.

In all of the above embodiments, the flange portion 4 is formed on the folded portion 3.
This has the advantage that it is easy to connect to the hole formed in the plate and does not easily come off.

The outer diameter of the folded portion 3 is usually about 2 to 5 times that of the tube body 2, but can be appropriately selected depending on the magnitude of vibration, the pressure of the liquid used, etc. Further, the tube body 2 may have a straight tube shape with the same diameter, or may have a tapered shape.

Although the embodiments of the present invention have been described above, various modifications can be made to the present invention without changing the gist thereof.

[Effects of the Invention] The connecting tube of the present invention has the advantage that it can well absorb not only vibrations in the axial direction of the tube, but also vibrations in the direction perpendicular to the tube or in the direction of inclination, and that the installation space is small. Particularly when it is used in a vibrating air pump, it has the advantage that it can be made compact and quiet, with less noise pollution, even though it is a vibrating pump.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of a connecting tube according to an embodiment of the present invention, Fig. 2 is a cross-sectional front view of a main part of a pump device in which the connecting tube of the present invention is installed, and Fig. 3 is a cross-sectional view of another embodiment. FIG. 4 is a sectional view of a connecting tube according to another embodiment, and FIGS. 5 to 7 are sectional views of conventional connecting tubes. Main symbols in the drawing, 1... Connection tube, 2...
Tube body, 3... folded part, 4... flange part.

Claims (1)

[Claims for Utility Model Registration] 1. A tube body made of an elastic material and having a cylindrical tube body and a folded part that is folded back at least one end of the tube body so that the inner circumferential surface faces outward, and the folded part A connecting tube characterized in that a flange portion is integrally formed on the outer periphery of the tube. 2 Utility model registration claim 1, in which the folded portion is formed only at one end of the tube body
Connection tube as described in section. 3. The connecting tube according to claim 1, wherein the folded portions are formed at both ends of the tube body.