JPH0742893U - Sealing material for pipe connection - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a sealing material for pipe connection, which is easy to install when a pair of tubular members are connected in a sealed state, and can prevent damage due to the work. An elastic member having a U-shaped cross section, which is fitted to one connecting end of a pair of tubular members 2, 5 to be connected, and is provided on both sides of the elastic member sandwiched between the pair of tubular members 2, 5. A projection 4 having a sawtooth cross section in the axial direction of the tubular members 2, 5 and a corrugated cross section in the circumferential direction of the tubular members 2, 5.
Sealing material 1 for connecting pipes in which 7 is formed.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a pipe connecting seal material for connecting tubular members such as pipes in a sealed state.

[0002]

[Prior art]

 Conventionally, there are various connecting means for connecting a pair of tubular members in a sealed state, and various sealing materials as illustrated in FIGS. 5 to 10 are often used. For example, in the one shown in FIGS. 5 to 8, a large number of notches 12 are formed at the connection end of the first pipe 11 having a large diameter at intervals in the circumferential direction. So that the rubber seal 13 having a U-shaped cross section is fitted so that the second pipe 14 with a smaller diameter is fitted inside the rubber seal 13 and tightened with the wire clip 15 from the outside of the first pipe 11. Then, there is a means for fixing the first pipe 11 in the deformed state so as to reduce the diameter of the portion where the notch 12 is formed.

However, according to this means, as shown in FIG. 7, when looking at the circumferential cross-section of the portion where the notch 12 is formed, the first pipes 11 are scattered at a certain interval. As shown in FIG. 8, since the portion where the notch 12 is formed is retracted from the portion where the tightening force of the wire clip 15 acts, a sufficient seal is provided at the portion where the notch 12 is formed. When the surface pressure cannot be generated and the pipe internal pressure is high, there is a problem that the internal fluid leaks from this part.

Further, as shown in FIG. 9, the first pipe 11 and the second pipe 14 have the same diameter and are connected to each other by a rubber hose 16, and each is fixed by a wire clip 15. As shown in Fig. 5, a recess 17 is formed on the outer peripheral surface of the second pipe 14 having a small diameter, and an O ring 18 is fitted into the recess 17 to seal the gap with the first pipe 11 having a large diameter. However, the former requires the rubber hose 16 to be attached to the one pipe 11 and then the rubber hose 16 to the other pipe 14, so that the work is troublesome. There is a problem in that the process for forming the recess 17 for fitting the ring 18 is expensive.

[0005]

[Problems to be solved by the device]

 Therefore, as shown in FIG. 11, a first pipe 11 having a large diameter in which the notch 12 is not formed is used, and a projection having a sawtooth-shaped axial section is formed at the connection end of the first pipe 11. A seal member 20 having a U-shaped cross section formed on both surfaces of the portion where 19 is sandwiched between the first pipe 11 and the second pipe 14 is mounted. The present inventor has found a means for fixing the first pipe 11 with the wire clip 15 from the outside after fitting the and.

However, as the research progressed, it became clear that this connecting means had a problem. That is, when the second tube 14 is fitted inside the first tube 11 via the sealing material 20 made of an elastic material such as rubber, the projection 19 of the sealing material 20 is crushed as shown in FIG. Although it deforms, at this time, since there is no escape area for the deformed sealing material 20, there is a problem that the deformation resistance becomes extremely high and the mounting workability becomes poor. Further, if the first pipe 11 and the second pipe 14 are forcibly connected against each other against the deformation resistance, the sealing material 20 is dragged by the second pipe 14 and, in the worst case, is split. is there.

[0007] In view of the above problems, the present invention is a sealing material for pipe connection, which is easy to install when connecting a pair of tubular members in a sealed state, and can prevent damage due to the work. It is intended to provide.

[0008]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, a sealing material for pipe connection according to the present invention is an elastic member having a U-shaped cross section fitted to one connecting end of a pair of tubular members to be connected. On both sides of the elastic member sandwiched between the tubular members, protrusions having a sawtooth cross section in the axial direction of the tubular member and a corrugated cross section in the circumferential direction of the tubular member are formed.

The shape of the projection formed on the elastic member is formed in a sawtooth shape in an axial sectional view. At this time, if a gentle slope is arranged in the direction in which the tubular member is inserted, the elastic member is formed. This is preferable because it has less deformation resistance and improves workability. Also, although this protrusion is formed in a corrugated shape in the circumferential cross-sectional view, the mountain portion of the protrusion on the outside of the elastic member sandwiched between the tubular members in a free state before mounting is a large-diameter tubular portion. The trough portion is projected outward from the inner diameter of the material, and the trough portion is recessed inward from the inner diameter, so that the crest portion pushed out by being fitted into the tubular member fills the trough portion. Similarly, the valley portion of the protrusion inside the elastic member sandwiched between the two tubular members recedes outward from the outer diameter of the small-diameter tubular member, and the crest portion protrudes inward from the outer diameter. In this way, the deformation of the crests pushed out by fitting the tubular member fills the space of the troughs.

[0010]

[Work]

 Since the sealing material for pipe connection according to the present invention has the above configuration, when the pair of tubular members are connected to each other, the protrusions of the elastic member formed in a corrugated shape in the circumferential sectional view are deformed at the ridges. By filling the space of the troughs with this, it is possible to generate sealing surface pressure not only in the crests but also in the troughs, and at the same time, the excessive deformation is suppressed, so the deformation resistance is small and the elastic member Damage is prevented.

[0011]

【Example】

 Next, with reference to the drawings, an embodiment of the present invention will be described in connection with the case of connecting two tubular members having different connecting end diameters. First, as shown in FIG. 1, the seal member 1 of this embodiment has a gentle slope 3 in a direction in which the tubular member 2 is inserted in a portion fitted to the tubular member 2 having a large diameter in an axial sectional view. The sawtooth-shaped projections 4 are formed on the other hand, while the sawtooth-shaped projections 7 with the gentle slopes 6 are also formed in the direction in which the tubular member 5 is inserted at the portions where the small-diameter tubular member 5 contacts. Is forming. The protrusions 4 and 7 are alternately arranged on the front and back sides of the portion sandwiched between the large-diameter tubular member 2 and the small-diameter tubular member 5.

Further, as shown in FIG. 2, in the sealing material 1 of the present embodiment, the protrusions 4 and 7 described above in the circumferential sectional view are arranged such that the peaks 8 and the valleys 9 are alternately arranged continuously. Preferably, the troughs 9 of the inner protrusions 7 are located behind the ridges 8 of the outer protrusions 4 as in this embodiment, and conversely the troughs of the outer protrusions 4 are formed. It is arranged on the back side of 9 so that the ridges 8 of the inner protrusions 7 are located.

Further, the sealing material 1 of the present embodiment is provided on the outside of the sealing material 1 so that the contour line of the sealing material 1 meanders in a zigzag manner with the chain line A representing the inner diameter of the large-diameter tubular member 2 sandwiched therebetween. As shown in FIG. 3, an area S ₈ surrounded by the chain line A and the contour line of the mountain portion 8 is defined by a chain line A as shown in FIG. It is made larger than the area S ₉ surrounded by the contour line of the valley 9.

By setting the sizes of the peaks 8 and the valleys 9 in this manner, both tubular members 2 and 5 are connected via the seal material 1 and fixed by a wire clip (not shown). When the protrusion 4 is deformed, the peak portion 8 is crushed and escapes toward both skirts to fill the space formed by the valley portion 9. At this time, as described above, since the surface area S ₈ is set to be larger than the area S _9, it is possible to secure the sealing surface pressure not only in the peak portion 8 but also in the valley portion 9. Become. On the other hand, if the area S ₈ is smaller than the area S ₉ , the deformed crests 8 cannot fill the troughs 9 and a seal surface pressure can be generated in the troughs 9. It will disappear.

Further, similarly to this, as shown in FIG. 4, the sealing material 1 is formed so that the contour line of the sealing material 1 meanders in a zigzag manner with a chain line B 1 indicating the outer diameter of the small-diameter tubular member 5 interposed therebetween. The peaks 8 and the troughs 9 of the inner protrusion 7 are alternately arranged continuously over the entire circumference, and the area S ₈ surrounded by the chain line B and the contour line of the peaks 8 is the contour of the chain line B and the troughs 9. It is designed to be larger than the area S ₉ surrounded by the line.

By forming the shapes of the protrusions 4 and 7 as described above, when the protrusions 4 and 7 are deformed when the two tubular members 2 and 5 are connected, the deformation margin of the peak portion 8 is changed to the valley portion 9. Since it can be released, deformation resistance does not become excessive, installation work can be performed easily, and damage to the sealing material 1 can be prevented while ensuring sufficient sealing surface pressure. Of.

Although the rubber seal material 1 is used in the present embodiment, other elastic materials such as soft plastic can be used without any problem, and as a specific application, it is used as an engine part. Taking the case as an example, the present invention can be applied to a connection between an intake pipe on the downstream side of an air cleaner and an inlet on the compressor side of a turbocharger.

[0018]

[Effect of device]

 The sealing material for pipe connection according to the present invention is an elastic member having a U-shaped cross section, which is fitted to one connecting end of a pair of tubular members to be connected, and is a member of the elastic member sandwiched between the pair of tubular members. Since the projections having a serrated cross section in the axial direction of the tubular member and the corrugated cross section in the circumferential direction of the tubular member are formed on both surfaces, the following effects can be obtained.

When a pair of tubular members are connected to each other, when the protrusions of the elastic member formed in a corrugated shape in the circumferential sectional view are deformed, the peaks are deformed to fill the spaces of the valleys. The seal surface pressure can be generated not only in the peaks but also in the valleys, and reliable sealing performance can be secured. Further, since the excessive deformation is suppressed at that time, it is possible to prevent the elastic member from being damaged. Moreover, since the deformation resistance is small, the mounting work can be performed smoothly and the productivity can be improved.

[Brief description of drawings]

FIG. 1 is a side view of an axial cross section of a part of a pipe connecting seal material according to an embodiment of the present invention.

FIG. 2 is a sectional view in the circumferential direction of the sealing material for pipe connection shown in FIG.

FIG. 3 is a circumferential sectional view showing a deformation of an outer protrusion of the pipe connecting seal material shown in FIG.

FIG. 4 is a circumferential cross-sectional view showing a deformation of an inner protrusion of the pipe connecting seal material shown in FIG.

FIG. 5 is a side view in which a part of a conventional pipe connecting seal material is shown in an axial cross section.

FIG. 6 is a side view in which a part of a case where the pipes are connected by using the pipe connecting seal material shown in FIG. 5 is an axial cross section.

7 is a cross-sectional view taken along line CC of FIG.

8 is a cross-sectional view taken along the line DD of FIG.

FIG. 9 is a side view in which a part of a conventional pipe connecting seal material is taken as an axial cross section.

FIG. 10 is a side view showing a part of a conventional pipe connecting seal material in an axial cross section.

FIG. 11 is a side view showing a part of a conventional pipe connecting seal material in an axial cross section.

FIG. 12 is a side view showing a part of a deformation of the pipe connecting seal material shown in FIG. 11 in an axial cross section.

[Explanation of symbols]

 1 Sealing material for pipe connection 2 Tubular member 4 Protrusion 5 Tubular member 7 Protrusion

Claims (1)

[Scope of utility model registration request] 1. An elastic member having a U-shaped cross section that is fitted to one connecting end of a pair of tubular members to be connected, and the tubular member is provided on both sides of the elastic member sandwiched between the pair of tubular members. A sealing material for pipe connection, which has a saw-toothed cross section in the axial direction and a corrugated projection formed in the circumferential direction of the tubular member.