JP2858394B2 - Branch pipe fitting - Google Patents

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 for connecting pipes at the end of a pipe to pipe at the same time.

[0002]

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

[0003] Pipe fittings of this kind are found, for example, in German Patent Nos. 2,428,101, Japanese Patent Nos. 10,322,534 and 1,157,955, and there are practically extremely satisfactory pipe-to-pipe connections. However, it cannot be used as a branch pipe joint for connecting pipes that further branch at the pipe-to-tube butt.

As a method of branching a pipe, there is a method of piercing a part of the pipe and connecting a branch pipe thereto, and a method of simultaneously connecting a branch pipe to a butt portion of a pipe-to-pipe connection. There is a casting type as a branch pipe joint to be used.

[0005] However, a reliable branch pipe joint is not found in a housing type pipe joint. This is considered to be due to the fact that the housing is manufactured by press-molding stainless steel or steel plate, so that it is difficult to integrally manufacture the housing, and that simply connecting the branch portions lacks reliability.

[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 object of the present invention is to provide a branch socket in which a peripheral outer surface of a branch opening formed in a housing is formed flat to form a fixing surface of a branch socket, and a groove is formed in the fixing surface on the inner surface. The housing and the branch socket are integrated by welding, and the protruding portion which is inserted into the branch socket at a position corresponding to the branch opening of the housing and forms a tongue whose tip is fitted into the groove is opposed to the protrusion. A rubber sleeve having a hollow cylindrical portion formed by projecting an intimate seat positioned on the pipe end surface of the pipe-to-tube to be connected is mounted on the inner surface of the housing, and the hollow cylindrical portion of the rubber sleeve is protruded. This is achieved by providing a branch pipe joint in which a portion is closely fitted in a branch socket and a tongue is fitted in a groove so as to be in close contact.

Further, in the above means, there is provided a branch pipe joint in which a spacer made of a material harder than the rubber sleeve penetrates into the hollow cylindrical portion of the rubber sleeve.

[0009]

In the above means, the peripheral outer surface of the branch opening opened in the housing is formed flat and is used as a fixing surface of the branch socket, so that the end surface of the branch socket is formed with a curved surface corresponding to the cylindrical surface of the housing. Therefore, the housing and the branch 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 protruded and opened, and the protruding portion of the hollow cylindrical portion having a hollow is closely fitted and inserted into the branching socket and the close contact seat is opposed. A branch pipe joint having a water-tight, oil-tight, and air-tight pipe is formed by closely contacting a pipe end face of a pipe-to-pipe 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.
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
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 port opened in FIG.

As shown in FIG. 6 or FIG. 7, which shows a cross section of the opening for explaining the opening of the housing, this branch pipe joint has a branch port 3 opened in the housing 1 and the periphery of the branch port 3 is cylindrical. Formed on a flat fixing surface 4 that is concave or convex with respect to the outer periphery of the surface, as shown in FIGS. 2 to 5, a branch 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 facing a protrusion 7 formed by projecting a portion of the rubber sleeve 2 mounted on the inner surface of the housing 1 corresponding to the branch port 3 of the housing 1. A protrusion 7 of a hollow cylindrical portion 8 having a hollow 6 formed of an intimate seat formed so as to be in close contact with the socket is tightly fitted to the branch socket so as to be watertight, oiltight, and airtight. In the drawings, A and B are pipes to be connected to each other while maintaining a certain gap C.

Next, with reference to FIGS. 2 to 5, a specific example of a hollow cylindrical portion having a branch socket and a protrusion of a rubber sleeve will be described. FIG. 2 is shown as a reference example.
In this reference example, the protruding portion 7 of the hollow cylindrical portion 8 of the rubber sleeve 2 is fitted into the branch socket 5, and its tip is formed by a branch pipe connection thread 5 a formed on the inner surface of the branch socket 5. It is in contact with the end step 5b to be watertight, oiltight, and airtight. In the branch socket 5 in which the screw portion 5a is not formed, a step portion is separately formed on the inner surface thereof. This structure includes an inner surface of the housing 1 where the branch socket 5 is fixed, an inner surface of the branch socket 5 and the rubber sleeve 2.
Can be simultaneously secured by the tightening of the tightening mechanism of the housing 1.

FIG. 3 is also shown as a reference example.
In this reference example, the protrusion 7 of the hollow cylindrical portion 8 of the rubber sleeve 2 has a conical tapered surface 7a on the outer surface, and a branch pipe connection thread 5a and a tapered surface of the protrusion 7 on the inner surface. The tapered surface 5c corresponding to the tapered surface 5c is fitted into a branching socket having a tapered surface 5c formed thereon, and the tapered surface 7a and the tapered surface 5c are in close contact with each other in a water-tight, oil-tight, and air-tight manner. In this structure, the compressive force from the close contact seat 8a of the hollow cylindrical portion is converted into a compressive force toward the inside of the hollow of the protruding portion 7 by the tightening of the tightening mechanism, and the inner surface of the branch socket 5 and the outer surface of the protruding portion 7 are converted. Adhesion with is further improved.

FIG. 4 shows an embodiment according to the first aspect of the present invention. In this embodiment, the protruding portion 7 of the hollow cylindrical portion 8 of the rubber sleeve 2 is directed outward at the tip thereof. A tongue 7b is formed. The tongue 7b is inserted into the branch socket 5 having a groove 5d formed in the branch pipe connection screw 5a on the inner surface.
Is fitted in the groove 5d, and the tongue 7b and the groove 5d are in close contact with each other,
Watertight, oiltight and airtight. This structure has an internal pressure sealing-type adhesion performance through the passage of various fluids.

FIG. 5 shows a second embodiment of the present invention. In the embodiment shown in FIG. 4, a hollow spacer 9 made of a hard material is penetrated into the inner surface of the hollow cylindrical portion 8. . However, the difference from FIG. 4 is that the fixing surface 4 of the branch socket 5 is formed to be convex with respect to the outer surface of the cylinder, and the branch pipe connection screw is not formed on the inner surface of the branch socket. The structure in which the spacer penetrates into the hollow cylindrical portion 8 is such that the inner diameter of the housing becomes smaller 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 comes into close contact with the outer surface of the tube.
A shift occurs in the contact portion on the inner surface of the rubber sleeve 2, and this shift deforms the hollow cylindrical portion 8 of the rubber sleeve 2, resulting in non-uniform adhesion between the tip of the protrusion 7 and the inner surface of the branch socket 5. It is possible to eliminate the possibility that the compression force of the contact seat 8a of the hollow cylindrical portion 8 is efficiently transmitted to the tip of the hollow cylindrical portion 8 without escaping to the inside of the hollow cylindrical portion 8, and 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 the above 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.
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 branch socket 5 is formed outwardly as shown in FIGS. Basically the same in point, the housing 1 is divided into two parts by a dividing part 16 and connected by a hinge 14 and a plate body 15 so that a hinge-like function that allows a discontinuous portion of the housing 1 to be easily expanded. They differ in that they are added.

[0017]

Since the present invention has been made as described above,
It has the following effects.

Since the outer surface around the branch opening opened in the housing is formed as a flat fixing surface, the branch socket is stably provided on the fixing surface without performing a curved surface processing corresponding to the curved surface of the housing on the end surface of the branch socket. The hollow cylindrical part protruding from the rubber sleeve is fitted and inserted into the inner surface of the branch socket and the protrusion of the hollow cylindrical part is brought into close contact with the inner surface of the branch socket, so watertight, oiltight, airtight reliability A highly reliable branch pipe joint is formed.

In particular, in the first aspect, the protrusion of the hollow cylindrical portion of the rubber sleeve having the tongue is inserted into the branch socket having the groove formed on the inner surface, and the tongue is inserted into the groove. The close contact structure enhances the internal pressure sealing type close contact performance through the passage of various fluids.

According to the second aspect of the present invention, the hollow spacer made of a hard material is closely inserted into the inner surface of the hollow cylindrical portion of the rubber sleeve. Therefore, when the housing is tightened by the housing tightening mechanism, the housing is tightened. The inner diameter of the rubber sleeve is reduced, and the contact between the rubber sleeve and the inner surface of the housing, which occurs when the rubber sleeve is brought into close contact with the outer surface of the tube, is displaced. Eliminates the possibility of non-uniformity in the contact force between the tip and the inner surface of the branching socket.Efficiently without escaping the compression force of the contact seat of the hollow cylindrical portion to the inside of the hollow cylindrical portion. Transmitted to the tip of the hollow cylindrical part,
Good and stable adhesiveness can be maintained.

Therefore, an excellent branch pipe joint can be provided in a housing type which is press-molded.

[Brief description of the drawings]

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

FIG. 2 is a detailed sectional view showing an internal structure of a main part of a branch pipe joint as a reference example.

FIG. 3 is a detailed sectional view showing another embodiment of the internal structure of the main part of the branch pipe joint as a reference example.

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

FIG. 5 is a detailed 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 sectional view showing an embodiment of an opening of a casing of a 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 cross-sectional view showing another embodiment of the housing of the branch pipe joint according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Housing 2 Rubber sleeve 3 Branch opening in housing 4 Fixing surface 5 Branching socket 5a Screw 5b Step 5c Tapered surface 5d Groove 6 Hollow 7 Projection 7a Tapered surface 7b Tongue 8 Hollow cylindrical portion 8a Adhesive seat 9 Spacer 10 Welding

Claims (2)

(57) [Claims] An outer peripheral surface of a branch opening opened in a housing is formed flat to be a fixing surface of a branch socket, and a branch socket having a groove formed on an inner surface thereof is fixed to the fixing surface to form a housing and a branch socket. A projection that forms a tongue that is inserted into the branch socket at a location corresponding to the branch opening of the housing and the tip is fitted into the groove,
A rubber sleeve having a hollow cylindrical portion formed by projecting an intimate seat positioned on a tube end surface of a tube-to-tube to be connected to each other is mounted on the inner surface of the housing, and the hollow cylindrical portion of the rubber sleeve is mounted. A branch pipe joint characterized in that the protruding portion of the branch pipe is closely fitted into the branch socket and the tongue portion is fitted into the groove so as to closely fit. 2. The branch pipe joint according to claim 1, wherein a hollow spacer made of a material harder than the rubber sleeve is closely penetrated into the inner surface of the hollow cylindrical portion of the rubber sleeve.