JPH08135870A - Branch pipe coupling - Google Patents

Abstract

PURPOSE: To improve the sealing performance by forming the outer surface on the periphery of a branched port opened on the housing of a branched pipe coupling, to a flat fixation surface and inserting a hollow cylindrical part projecting from a rubber sleeve, on the inner surface of the socket for branching, and closely attaching the socket for branching and the projection part of the hollow cylindrical part. CONSTITUTION: A branched port 3 is opened on a hosing 1, and the periphery of the branched port 3 is formed to a fiat fixation surface 4 which is in recess or projection for the cylindrical outer periphery, and a socket 5 for branching is fixed on the fixation surface 4, and formed integrally through welding 10. Further, a projection part 7 is formed by projecting the place corresponding to the branched port 3 on the housing 1 of a rubber sleeve 2 installed on the inner surface of the housing 1, and a closely attached seat 8a positioned in close adhesion with the pipe end part surfaces of the pipes A and B to be joined is formed, and the projection part 7 is fitted in a watertight and airtight form on the socket 5 for branching. Accordingly, the top end of the projection part 7 is closely attached in the watertight and airtight form at the end part stage difference part 5b of a screw part 5a for the connection of the branched pipe which is formed on the inner surface of the socket 5 for branching.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a branch pipe joint which is located at the abutting portion of pipe-to-pipe and which simultaneously connects further branched pipes.

[0002]

2. Description of the Related Art There is a housing type in which a discontinuous end portion is tightened while a pipe-to-pipe connected to one of conventional pipe joints is maintained with a constant gap. The housing of this type of pipe joint has a bolt fastening mechanism at a cylindrical discontinuous portion where one end in the circumferential direction is discontinuous,
It has a structure in which both ends of the cylindrical shape in the axial direction are inward in the inner circumferential direction, and the inner diameter is reduced by tightening bolts. Also, the cylindrical axial cross section for sealing the pipe to be connected to the inner surface is C.
A rubber sleeve of internal pressure sealing type is attached, and by tightening the housing, the lip of the rubber sleeve is brought into close contact with the entire circumference of the pipe end portion.

This type of pipe joint is found, for example, in German Patent No. 2428101, Japanese Patent No. 1032534, and Japanese Patent No. 1157995, and there are practically very satisfactory pipe-to-pipe connections. However, it cannot be used as a branch pipe joint for connecting pipes that further branch at the abutting portion of the pipe to pipe.

As a method of branching a pipe, there are a method of making a hole in the middle of the pipe and connecting a branch pipe here, and a method of simultaneously connecting a branch pipe to the abutting portion of the pipe-to-pipe, and the latter method. The branch pipe joint used is of the cast type.

However, there is no reliable branch pipe joint in the housing type pipe joint. It is considered that this is because the housing is manufactured by press-molding stainless steel or a steel plate, so that it is difficult to integrally manufacture the housing, and simply connecting the branch portions is not reliable.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to provide a reliable branch pipe joint in the above housing type pipe joint.

[0007]

SUMMARY OF THE INVENTION The above object is to form a flat outer peripheral surface of a branch opening opened in a housing as a fixing surface of a branching socket, and fix the branching socket to this fixing surface to form a housing. The branch socket is integrated by welding, and a protrusion that is fitted into the branch socket at a corresponding position of the branch port of the housing and a close contact seat that is located on the pipe end face of the pipe-to-pipe to be connected to face each other. To provide a branch pipe joint in which a rubber sleeve having a hollow tubular portion formed by projecting respectively is mounted on the inner surface of the housing, and the projecting portion of the hollow tubular portion of the rubber sleeve is closely fitted into the branch socket. To be achieved.

More specifically, one example is one in which the fixing surface of the branching socket, which is formed flat, is concave or convex with respect to the outer surface of the cylinder of the housing, and the branching socket and the rubber sleeve hollow cylinder. A better contact structure of the projecting portion of the cylindrical portion is formed by abutting the projecting portion of the hollow cylindrical portion of the rubber sleeve to the step portion formed on the inner surface of the branch socket,
A tapered surface is formed on the inner surface of the branch pipe socket that corresponds to the outer surface of the protruding portion of the hollow cylindrical portion of the rubber sleeve, and the tapered surface is in intimate contact with the inner surface of the branch socket. The tongue part formed on the tip of the protruding part of the hollow cylindrical part of the sleeve is fitted into the hollow cylindrical part of the sleeve so as to be in close contact.In addition, a spacer made of a material harder than the rubber sleeve is inserted into the hollow cylindrical part of the rubber sleeve. The above problems are solved by these means.

[0009]

In the above means, the outer peripheral surface of the branch opening opened in the housing is formed flat and used as the fixing surface of the branch socket, so that the end surface of the branch socket has a curved surface corresponding to the cylindrical surface of the housing. The fixing can be performed stably without performing, and the housing and the branching socket can be stably integrated by welding. Then, the corresponding portion of the branch opening of the housing of the rubber sleeve mounted on the inner surface of the casing is projected and opened, and the protruding portion of the hollow cylindrical portion having a hollow is closely fitted into the branch socket to face the close seat. A pipe joint having a water-tight, oil-tight, and air-tight pipe line is formed by closely contacting the pipe end faces of the pipes to be connected.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 has a tightening mechanism including a tightening plate 11, a tightening bolt 12 and the like at a cylindrical discontinuous portion where one end in the circumferential direction is discontinuous, and an edge portion 13 at both axial ends.
An inner pressure sealing type rubber sleeve 2 for sealing a pipe to be connected is mounted on the inner surface of the housing 1 having
1 shows a branch pipe joint in which a branch socket 5 is integrated by welding with a flat fixing surface 4 on the outer peripheral surface of a branch opening opened in the.

In this branch pipe joint, a branch port 3 is opened in the housing 1 and the periphery of the branch port 3 is a cylinder as shown in FIG. It is formed on a flat fixing surface 4 which is concave or convex with respect to the outer circumference of the surface, and as shown in FIGS. 2 to 5, a branching socket 5 is fixed to the fixing surface 4 and is fixed to the fixing surface 4 by welding 10. A pipe end face of a pipe-to-pipe to be connected integrally with a protruding portion 7 formed by protruding a portion of the rubber sleeve 2 mounted on the inner surface of the housing 1 corresponding to the branch opening 3 of the housing 1. The protruding portion 7 of the hollow cylindrical portion 8 having the hollow 6 which is formed so as to be in close contact with and is closely fitted to the branching socket in a watertight, oiltight, or airtight manner. In addition, A and B in the figure are pipes to be opposed to each other with a constant gap C maintained therebetween.

Next, based on FIGS. 2 to 5, a specific example of the hollow cylindrical portion in which the branching socket and the protruding portion of the rubber sleeve are formed will be described. FIG. 2 shows the first embodiment,
In this embodiment, the projecting portion 7 of the hollow cylindrical portion 8 of the rubber sleeve 2 is fitted into the branch socket 5 and the tip of the projecting portion 7 of the branch pipe connecting screw portion 5 a formed on the inner surface of the branch socket 5. The end step portion 5b is brought into contact with the end step portion 5b to be water-tight, oil-tight, and air-tight. In the case of the branching socket 5 in which the screw portion 5a is not formed, a stepped portion is separately formed on the inner surface thereof. This structure has an inner surface of the housing 1 where the branch socket 5 is fixed, an inner surface of the branch socket 5 and a rubber sleeve 2.
It is possible to simultaneously secure the close contact property by tightening the tightening mechanism of the housing 1.

FIG. 3 shows a second embodiment. In this embodiment, the protruding portion 7 of the hollow cylindrical portion 8 of the rubber sleeve 2 has an outer surface formed as a conical tapered surface 7a, It is fitted into a branch socket having an inner surface formed with a branch pipe connecting screw portion 5a and a tapered surface 5c corresponding to the tapered surface 7a of the protruding portion 7, and the tapered surface 7a and the tapered surface 5c.
Due to this, it is watertight, oiltight and airtight. This structure is
The tight seat 8a of the hollow cylindrical part by tightening the tightening mechanism
Is converted into a compressive force to the inside of the hollow of the projecting portion 7, and the adhesion between the inner surface of the branching socket 5 and the outer surface of the projecting portion 7 is further enhanced.

FIG. 4 shows a third embodiment. In this embodiment, the protruding portion 7 of the hollow cylindrical portion 8 of the rubber sleeve 2 has a tongue portion 7b formed outward at the tip thereof. , Is inserted into the branching socket 5 in which the groove portion 5d is formed in the branch pipe connecting screw portion 5a on the inner surface, the tongue portion 7b is fitted into the groove 5d, the tongue portion 7b and the groove portion 5d are in close contact, and the watertightness, oil It is tightly and closely airtight. This structure has internal pressure sealing type adhesion performance by the passage of various fluids.

FIG. 5 shows a fourth embodiment. In the embodiment shown in FIG. 4, a hollow spacer 9 made of a hard material is inserted into the inner surface of the hollow cylindrical portion 8. However, it differs from FIG. 4 in that the fixing surface 4 of the branching socket 5 is formed to be convex with respect to the outer surface of the cylinder, and the branching pipe connecting screw is not formed on the inner surface of the branching socket. In the structure in which the spacer is inserted into the hollow cylindrical portion 8, the inner diameter of the housing becomes small when the housing 1 is tightened by the tightening mechanism of the housing 1, and the rubber sleeve 2 and the housing 1 which are generated when the rubber sleeve 2 is closely attached to the outer surface of the tube. The contact portion of the inner surface of the rubber sleeve 2 is displaced, and the displacement causes the hollow cylindrical portion 8 of the rubber sleeve 2 to be deformed, resulting in uneven contact force between the tip portion of the protruding portion 7 and the inner surface of the branching socket 5. That is, the compressive force of the close contact seat 8a of the hollow tubular portion 8 is efficiently transmitted to the tip of the hollow tubular portion 8 without being released to the inside of the hollow tubular portion 8, which is good. Moreover, stable adhesion can be maintained.

Next, FIG. 8 shows an embodiment of a branch pipe joint in which the structure of the housing is different from those of the previous embodiments. This branch pipe joint has a tightening mechanism including a tightening plate 11, a tightening bolt 12 and the like at a cylindrical discontinuous portion where one end in the circumferential direction is discontinuous, and an edge portion 13 at both ends in the axial direction.
An inner pressure-sealing type rubber sleeve 2 for sealing a pipe to be connected is mounted on an inner surface of a housing 1 having a housing 1, and a branching socket 5 is formed outward as shown in FIGS. 2 to 7. In principle, the housing 1 is divided into two parts by the dividing part 16 and is connected by the hinge 14 and the plate body 15 to provide a hinge-like function for easily opening and expanding the discontinuous portion of the housing 1. They differ in that they are added.

[0017]

Since the present invention is constructed as described above,
It has the following effects. Since the outer surface around the branch opening that opens in the housing is formed as a flat fixing surface, the branch socket can be stably fixed to the fixing surface without performing curved processing corresponding to the curved surface of the housing on the end surface of the branch socket. In addition, the hollow cylindrical part protruding from the rubber sleeve is inserted into the inner surface of the branching socket, and the branching socket and the protruding part of the hollow cylindrical part are brought into close contact with each other, so that watertightness, oiltightness, and airtightness are highly reliable. A branch pipe joint is formed. Therefore, it is possible to provide an excellent branch pipe joint in a press-molded housing type.

[Brief description of drawings]

FIG. 1 is a side view showing a branch pipe joint according to the present invention.

FIG. 2 is a detailed cross-sectional view showing the internal structure of the main part of the branch pipe joint according to the present invention.

FIG. 3 is a detailed cross-sectional view showing another embodiment of the internal structure of the main part of the branch pipe joint according to the present invention.

FIG. 4 is a detailed cross-sectional view showing another embodiment of the internal structure of the main part of the branch pipe joint according to the present invention.

FIG. 5 is a detailed cross-sectional view showing another embodiment of the internal structure of the main part of the branch pipe joint according to the present invention.

FIG. 6 is a cross-sectional view showing an embodiment of the opening of the casing of the branch pipe joint according to the present invention.

FIG. 7 is a sectional view showing another embodiment of the opening of the casing of the branch pipe joint according to the present invention.

FIG. 8 is a sectional view showing another embodiment of the housing of the branch pipe joint according to the present invention.

[Explanation of symbols]

 1 Housing 2 Rubber Sleeve 3 Branch Port Opened in Housing 4 Fixing Surface 5 Branching Socket 5a Screw Part 5b Step 5c Tapered Surface 5d Groove 6 Hollow 7 Projection 7a Tapered Surface 7b Tongue 8 Hollow Cylindrical Section 8a Adhesive Seat 9 Spacer 10 welding

Claims (7)

[Claims] 1. An outer peripheral surface of a branch opening opened in a housing is formed as a flat surface to serve as a fixing surface of a branch socket. The branch socket is fixed to the fixing surface and the housing and the branch socket are integrated by welding. Hollow cylindrical part formed by projecting a projection part fitted into a branch socket at a corresponding position of a branch port of the housing and a close contact seat located on a pipe end face of a pipe tube to be connected to face each other. A branch pipe joint, wherein a rubber sleeve having the above is attached to an inner surface of a housing, and a protruding portion of a hollow cylindrical portion of the rubber sleeve is closely fitted and inserted into a branch socket. 2. The branch pipe joint according to claim 1, wherein the fixing surface of the branching socket is formed in a concave shape with respect to the cylindrical outer surface of the housing. 3. The branch pipe joint according to claim 1, wherein the fixing surface of the branch socket is formed to be convex with respect to the cylindrical outer surface of the housing. 4. A protruding portion of a hollow cylindrical portion of a rubber sleeve is fitted and inserted into a branching socket having a step portion formed so as to protrude on the inner surface, and the tip of the protruding portion is brought into contact with and closely contacted with the step portion. The branch pipe joint according to claim 1, claim 2, or claim 3. 5. A protrusion for a hollow cylindrical portion of a rubber sleeve having a tapered surface corresponding to the taper is fitted into a branching socket having a tapered surface on the inner surface, and both tapered surfaces are brought into close contact with each other. The branch pipe joint according to claim 1, claim 2, or claim 3. 6. A branching socket having a groove formed on an inner surface thereof is fitted with a protrusion of a hollow cylindrical portion of a rubber sleeve having a tongue formed therein, and the tongue is fitted into the groove so as to be in close contact. The branch pipe joint according to claim 1, claim 2, or claim 3. 7. A hollow spacer made of a hard material is closely inserted into the inner surface of the hollow cylindrical portion of the rubber sleeve, and the hollow sleeve is closely penetrated. Alternatively, the branch pipe joint according to claim 6.