JPH0562795U - Rubber hose joint structure - Google Patents

Abstract

(57) [Summary] [Purpose] A pipe and a rubber hose can be joined easily and quickly, and the sealing property is improved. [Structure] Insert a rubber hose with a hard member pre-installed into the pipe that forms a concave circumferential groove for locking the rubber hose on the inner surface, and push the rubber hose into the concave circumferential groove with the hard member to prevent it from coming off. The one that secures the sealing property. [Effect] The insertion work can be performed with one touch, and the insertion work efficiency is improved, and the sealing performance is improved by the pressing force of the hard member.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a joining structure for joining a flexible rubber hose to a pipe, and more particularly, to a joining structure for a rubber hose that facilitates joining work and improves sealing performance.

[0002]

[Prior Art]

 As shown in FIG. 11, a flexible rubber hose 10 is often used when connecting the pipes 8 and 9. In many cases, protrusions 11 and 12 for preventing the rubber hose 10 from coming off are integrally formed near the joint ends of the pipes 8 and 9. The rubber hose 10 is joined by inserting the outer circumferences of the pipes 8 and 9 into the joint end of the rubber hose 10, pushing the rubber hose 10 to a position where it gets over the protrusions 11 and 12, and then overcoming the protrusions 11 and 12. Clips 13 and 14 are attached to the end of 10 to prevent them from slipping off, and clips 13 and 14 are tightened.

On the other hand, as a publicly known technique for joining a pipe and a rubber hose, for example, Japanese Utility Model Publication No. 57-36873 can be cited. In the flexible hose connection device disclosed in this publication, a flexible hose connection recess is formed in a hose base made of hard resin, and the flexible hose is fitted into the flexible hose connection recess. After that, an elastic body is press-fitted from the inside of the flexible hose to connect and fix them.

[0004]

[Problems to be solved by the device]

 In the case of the conventional rubber hose joint structure shown in FIG. 11, it is necessary to push the rubber hose 10 into the pipes 8 and 9 and then fix the rubber hose 10 to the pipes 8 and 9 with the clips 13 and 14. , There is a problem that it is troublesome to wear. Further, when the clips 13 and 14 are attached and tightened at the positions where the projections 11 and 12 of the pipes 8 and 9 overlap, the rubber hose 10 is not fixed to the pipes 8 and 9, and the rubber hose 10 is easily removed. , The seal is insufficient. Therefore, it is necessary to control the insertion length of the rubber hose 10, and there is a problem that the insertion work becomes complicated.

On the other hand, in the case of the connecting device disclosed in Japanese Utility Model Publication No. 57-36873, the sealing property becomes insufficient unless the flexible hose is fitted in the recess for connecting the flexible hose sufficiently. However, when the thickness of the flexible hose is large, it is difficult to sufficiently fit the flexible hose into the recess for connecting the flexible hose by the spring force of the elastic body. Further, it is necessary to position the flexible hose connecting concave portion and the elastic body, which causes a problem of poor workability. From the above, in order to make it easier to fit the flexible hose into the flexible hose connection concave part, a convex part is formed in advance on the flexible hose, or the flexible hose is installed in the hose base. After insertion, it is necessary to push the flexible hose into the flexible hose connecting recess using a pushing tool or the like. Further, this connecting device is a connecting device for connecting a flexible hose to the hose base, and in the case where a rubber hose is fitted into the tip of a pipe arranged at a predetermined position as shown in FIG. It is difficult to insert an elastic body.

The present invention solves the above problems, and a rubber hose can be fitted to the end of the pipe by a relatively simple one-touch operation, which improves workability and sealability. It is an object of the present invention to provide a joint structure for a rubber hose that can improve the performance.

[0007]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention provides a rubber hose joint structure joined to a pipe having a concave circumferential groove for locking a rubber hose formed on the inner surface side near the joint end. The rubber hose is a straight pipe that can be inserted into the pipe, and the inner side of the rubber hose near the joint end has a diameter larger than the inner diameter of the rubber hose and is fitted into the concave circumferential groove. This structure constitutes a joint structure of a rubber hose to which a hard member having a locking portion having a possible shape is mounted.

[0008]

[Operation] A hard member is attached to the inner surface of the straight rubber hose in the vicinity of the joining end. Insert a rubber hose equipped with a hard member into the pipe, and push the rubber hose into the pipe while pressing the part where the hard member is mounted. When the hard member comes to the position of the concave circumferential groove formed on the inner wall of the pipe, the rubber hose is pushed into the concave circumferential groove and backed up and held by the hard member. The rubber hose and the pipe are tightly connected by setting the depth of the concave circumferential groove and the outer diameter of the hard member appropriately considering the inner diameter of the pipe and the outer diameter and thickness of the rubber hose. It Moreover, since the feeling of insertion changes when the hard member is aligned with the concave circumferential groove, it is possible to insert the rubber hose into the correct insertion position without managing the insertion length of the rubber hose.

[0009]

【Example】

An embodiment of the present invention will be described below with reference to the drawings. As shown in FIG. 1, the joining structure of this embodiment is composed of a pipe 1, a rubber hose 2 and an iron ring member 3 which is an example of a hard member as shown in FIGS. In addition, in this embodiment, the entire ring member 3 constitutes a locking portion of a hard member. As shown in FIG. 2, a concave circumferential groove 4 having a depth t is formed on the inner surface side of the pipe 1 near the joint end. Since the concave circumferential groove 4 is formed integrally with the pipe 1, the outer periphery of the pipe 1 projects by that amount, and the projection 5 is formed. Further, in order to facilitate the insertion of the rubber hose 2 and prevent the outer surface of the rubber hose 2 from being damaged, the joint end of the pipe 1 is slightly outwardly extended and rounded in this embodiment. It should be noted that the concave circumferential groove 4 and the protrusion 5 are generally formed in the pipe and are not special. As shown in FIG. 3, the rubber hose 2 is a general straight type and has a wall thickness T ₁ . The outer diameter is formed so that it can be inserted into the inner diameter of the pipe 1. As shown in FIGS. 4 and 5, the ring member 3 is formed by rolling a wire material having a wire diameter d, and the wire diameter d is formed so as to fit into the concave circumferential groove 4 of the pipe 1. To be done. As shown in FIG. 6, when the distance between the bottom portion a of the concave circumferential groove 4 and the outer diameter b of the ring member 3 is T ₂ , T ₁ , T ₂ , t, m = T ₂ −t The relationship is as follows, for example. That is, when T ₁ = 4 mm and t = 1 mm, T ₂ = 3 mm is appropriate, and m = 3-1 = 2 mm. Therefore, the rubber hose 2 is (1-T ₂ / T ₁ ) = (1-3 / 4) × when the rubber hose 2 is fitted into the concave circumferential groove 4 as shown in FIGS. 1 and 6. 100 = 25% compressed and assembled.

FIG. 7 and FIG. 8 are for explaining the joining action between the pipe 1 and the rubber hose 2. As shown in FIG. 7, the ring member 3 is mounted at an appropriate position near the joint end of the rubber hose 2. By mounting the ring member 3, the rubber hose 2 partially expands. Next, as shown in FIG. 8, the tip end side of the rubber hose 2 is inserted into the pipe 1, and the outer periphery of the rubber hose 2 where the ring member 3 is attached is slanted inward as shown by the arrow. The rubber hose 2 is inserted into the pipe 1 while pressing the ring member 3 while pushing the ring member 3. The rubber hose 2 is most compressed with the ring member 3 inserted in the pipe 1, and using the above-mentioned numerical value, it is compressed by (1-m / T ₁ ) = (1-2 / 4) × 100 = 50%. To be done. In general, it is desirable that the rubber hose 2 be attached with a tightening margin of 15 to 30% at the time of attachment, and that the rubber hose 2 be inserted at a compression rate of 50 to 60% at the time of insertion. When the ring member 3 comes to a position where it coincides with the concave circumferential groove 4 of the pipe 1, the compression rate of 50% is released, and the rubber hose 2 fits into the concave circumferential groove 4. At this moment, the compression rate is reduced from 50% to 25%, and it is felt that the rubber hose 2 is fitted. With the above, the joining of the pipe 1 and the rubber hose 2 is completed. Since the rubber hose 2 is sufficiently pressed into the pipe 1 by the ring member 3, the sealing property is secured.

FIG. 9 shows a joint structure in which the common rubber hose 2 is joined to the pipes 1a and 1b having different pipe diameters. The inner diameter of the pipe 1a is D₁And the inner diameter of the pipe 1b is D₂> D ₁ And To join one end of the rubber hose 2 to the pipe 1a, the inner diameter D₁Outer diameter d₁Ring member 3a is used and the other end side is joined to the pipe 1b side by the inner diameter D₂Outer diameter d₂> D₁The ring member 3b is used. After the ring members 3a and 3b are preliminarily attached to one end side and the other end side of the straight type rubber hose 2, the rubber hose 2 is attached by performing the inserting operation shown in FIGS. 7 and 8. Of course, the inner diameter D of the pipes 1a, 1b₁, D₂If the difference is large, a straight type rubber hose 2 cannot be used, but a single rubber hose 2 can be joined to pipes having different pipe diameters within the allowable range of the compression rate of the rubber hose 2.

FIG. 10 shows another embodiment of the present invention. In this embodiment, the pipe-shaped member 6 is used as the hard member. The pipe-shaped member 6 is made of an iron pipe having a locking portion 7 similar to the ring member 3 of the above-mentioned embodiment on the tip side. The outer diameter and the diameter d of the locking portion 7 are substantially the same as those of the ring member 3. The pipe portion is formed of an outer diameter that fits inside the rubber hose 2. Further, the axial length of the pipe-shaped member 6 is formed to a length that slightly protrudes from the joint end surface of the pipe 1 at the position where the locking portion 7 is fitted in the concave circumferential groove 4 of the pipe 1. With the structure described above, the rubber hose 2 is joined to the pipe 1 by fitting the locking portion 7 into the concave circumferential groove 4 to ensure the sealing property, and at the time of inserting the rubber hose 2, the two-dot chain line and the arrow By pressing the rear end side of the pipe-shaped member 6 as shown by, the rubber hose 2 can be pushed into the pipe 1 relatively easily. Further, since the rubber hose 2 is pressed toward the pipe 1 side by the outer periphery of the pipe portion of the pipe-shaped member 6, the sealing property is further improved and the detachment can be prevented. Further, when the inside of the pipe 1 becomes a negative pressure, the rubber hose 2 tries to be pulled inward, but it is backed up by the pipe-shaped member 6 and the sealing property is secured.

Although the ring member 3 and the pipe-shaped member 6 are used as the hard members in the above embodiments, the present invention is not limited to this. Further, although these members are made of iron, they may be hard materials and the materials are not limited.

[0014]

[Effect of the device]

 According to the present invention, the following remarkable effects are obtained. (1) A rubber hose with a hard member attached in advance is inserted into the pipe, and the rubber hose and the pipe can be joined by a one-touch insertion operation that locks the hard member in the concave circumferential groove. Is extremely easy and quick. (2) By appropriately setting the compression rate of the rubber hose with the hard member, the rubber hose can be brought into close contact with the pipe to improve the sealing property. (3) Since the hard member is not an elastic body, the backup function can be exerted even if a negative pressure acts on the pipe. (4) Since the compressibility of the rubber hose changes at the moment when the hard member is locked in the concave circumferential groove, the coincidence between the two can be grasped intuitively. This eliminates the need to control the insertion length of the rubber hose. (5) By pressing the end of the hard member, the rubber hose can be easily inserted and quick joining is possible. (6) The rubber hose may be an ordinary straight type, and the wall thickness does not need to be limited to a particularly thin wall hose, and can be widely applied. (7) A single rubber hose can be joined to pipes having different sizes. (8) If the hard member is formed into a pipe shape having a locking portion, the rubber hose can be easily pushed into the pipe, and the workability of joining is further improved. Further, since the rubber hose is compressed by the locking portion and the pipe portion, it is possible to further improve the sealing property and the removal preventing property. Further, the back-up function when the negative pressure acts on the pipe is further strengthened.

[Brief description of drawings]

FIG. 1 is a partial axial sectional view showing the entire structure of the present invention.

FIG. 2 is a partial axial sectional view of the pipe of the same embodiment.

FIG. 3 is a partial axial sectional view of the rubber hose of the same example.

FIG. 4 is a plan view of a ring member of the same embodiment.

5 is a cross-sectional view taken along the line AA of FIG.

FIG. 6 is an enlarged partial cross-sectional view for explaining the compressibility of the rubber hose with the hard member in the example.

FIG. 7 is a partial axial cross-sectional view showing an initial state of insertion work of the embodiment.

FIG. 8 is a partial axial cross-sectional view showing a state during the insertion of the same embodiment.

FIG. 9 is a partial axial cross-sectional view for explaining a structure in which a single rubber hose is joined to pipes having different diameters.

FIG. 10 is a partial cross-sectional view showing the overall structure of another embodiment of the present invention.

FIG. 11 is a partial cross-sectional side view showing a conventional joint structure between a pipe and a rubber hose.

[Explanation of symbols]

 1 pipe 1a pipe 1b pipe 2 rubber hose 3 ring member 3a ring member 3b ring member 4 concave circumferential groove 5 projecting portion 6 pipe-shaped member 7 locking portion

Claims (1)

[Scope of utility model registration request] 1. A joint structure of a rubber hose joined to a pipe, wherein a concave circumferential groove for locking a rubber hose is formed on the inner surface side near the joint end, wherein the rubber hose is inserted into the pipe. A straight pipe that can be attached, and on the inner surface side near the joint end of the rubber hose, a locking portion having a diameter larger than the inner diameter of the rubber hose and capable of being fitted into the concave circumferential groove is formed. A joint structure for a rubber hose, in which a hard member is attached.