JPH07190266A - Structure for universal joint - Google Patents

Abstract

PURPOSE:To smoothly form an inner surface of a connection part by forming a tapered surface having a specified angle on one pipe connection part, forming a widening part having a specified widening angle on the other pipe connection part, and easily fitting a water stopping rubber ring without removal. CONSTITUTION:A tapered portion 8 having a specified angle alpha is formed on a pipe connection part 4 of a pipe body 2, which portion 8 is tapered to an outer peripheral surface along a connection end face 6. A circular groove 9 is formed at an end of the outer periphery of the tapered portion 8 along the connection end face 6. A sealing rubber ring 10 is installed thereon. A widened portion 13 having the same widening angle beta as the tapered angle alpha of the tapered portion 8 from a connection end face 7 of a pipe connection part 5 of a pipe body 3. An engagement flange 14 of a widening part 13 is engaged and connected with an engagement groove 11 of the tapered portion 8. The pipe body 8 is thus arranged rotatably in respect to the pipe body 2. A bending angle is optionally adjusted by the inclined connection end faces 6, 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the structure of a universal joint for freely adjusting the connection angle between pipes in a pipe used for drainage.

[0002]

2. Description of the Related Art The pipes that make up sewage and drainage pipes are
A pipe joint that changes the piping direction of the pipeline is used. As this type of pipe joint, there is known a universal joint in which spherical joint portions are provided at the ends of a pair of pipe bodies, and these spherical joint portions are fitted to each other. Since there is a step due to the wall thickness of the tube, etc., there is a drawback that this step becomes an obstacle to the fluid flowing in the tube.

Therefore, in order to solve the above-mentioned drawbacks, the universal joints in which the connection end faces of the respective connection portions of the pair of pipes are formed to be inclined at a predetermined angle with respect to the pipe axis direction and are rotatably connected to each other. (Japanese Patent Laid-Open No. 1-182694 and Japanese Utility Model Laid-Open No. 4-95384), and this universal joint was used.

In this conventional universal joint, an expanded diameter receiving port is formed on one of the connecting end faces inclined at a predetermined angle, and the other connecting end face is inserted into the receiving port. It has a structure in which a mouth is formed, an annular groove is formed on the outer peripheral surface on the insertion side to attach a rubber ring for sealing, and an engagement groove is formed along the annular groove. Engagement flanges are formed to project on the inner peripheral surface of the tip edge, the receiving port and the insertion port are fitted to each other, and the engaging flanges are engaged with the engaging grooves, so that they can slide freely and rotate. By doing so, the angle of the other tubular body with respect to the one tubular body is set.

[0005]

However, in the above-mentioned conventional universal joint, the pair of connecting portions for connecting the pipes are formed of the inclined connecting end faces, and
The receiving port and the insertion port are formed so that the direction orthogonal to the inclined end face is the axial direction, and the fitting surface, which is the inner and outer peripheral surfaces thereof, is formed so as to be perpendicular to the inclined end face. Therefore, there is a problem that the rubber ring for water stop disposed on the fitting surface comes into contact with the engagement flange on the receiving side and comes off during fitting.

Further, since each inclined connection end face is obtained by obliquely cutting a substantially circular body, the inclined end face cut and formed at a predetermined inclination angle with respect to the pipe axis direction. Has an elliptical shape with the maximum width length as the major axis and the diameter of the tubular body as the minor axis, and when these connecting end faces are connected to each other, one connecting end face and the other connecting end face are There is no problem when they are aligned with the axis, but when the long axis and the short axis are aligned with each other, that is, when each tube is rotated by 90 °, the inner wall surface of the tube is not smoothly continuous, A step occurs at the position of the connecting end surface that transitions from the inner surface on the minor axis side to the inner surface on the major axis side, and especially when the inclination angle of each connecting end surface is set to a large value, this step portion appears remarkably, and as a flow path The problem that becomes improper occurs.

Therefore, in order to solve the above problems, the present invention can easily fit the water-stop rubber ring without dropping off, can change the direction of the pipe line to an arbitrary angle, and can be connected. An object of the present invention is to provide a structure of a universal joint in which a pipe inner surface in a part is formed smoothly.

[0008]

Means for achieving the above object will be described below with reference to the drawings corresponding to the embodiments. The structure of the universal joint 1 according to the present invention has a connecting end surface 6 inclined at a predetermined angle θ with respect to the pipe axis direction, and a taper portion 8 having a predetermined taper angle α that is tapered on the outer peripheral surface along the connecting end surface 6. Is formed and the opening 6a in the connection end face 6 has a pipe connection portion 4 formed in a substantially circular shape, and a connection end face 7 inclined at a predetermined angle θ with respect to the pipe axis direction. An expanded diameter portion 13 having a divergence angle β of a predetermined angle is formed so as to extend from the connection end face 7, and an opening 7a in the connection end face 7 is formed in a substantially perfect circle shape having the same diameter as the one tube body 2. And the other tube body 3 having a tube connection portion 5 according to the present invention, the one tube body 2 and / or the other tube body 3 is inclined at a predetermined angle γ with respect to the tube axis direction. And the other tubular body 3 is , And are rotatably connected to each other through the connection end surfaces 6 and 7.

[0009]

When one pipe connecting portion 4 is inserted into the other pipe connecting portion 5, the one pipe connecting portion 4 is formed with the taper portion 8 having the taper angle α, and the other pipe connecting portion 5 has the divergence angle β. Expanded part 13
Since it is formed, it can be easily inserted and attached.

As a result, they are slidably fitted to each other to be rotatable, and the connecting end surfaces 6 and 7 of the two pipe connecting portions 4 and 5 inclined at a predetermined angle .theta. The bending angle of any angle between 2θ can be freely adjusted, and each tube in the case where one tube body 2 is a bent tube inclined at a predetermined angle γ with respect to the tube axis direction. Between the bodies, the bending angle of any angle between γ and 2θ + γ can be freely adjusted and set.

Further, since the openings 6a, 7a in the respective connection end surfaces 6, 7 of the respective pipes 2, 3 are formed in a substantially circular shape, the inner surface of the pipe in this connection portion forms a smooth continuous flow path, The fluid flows smoothly.

[0012]

1 is a side sectional view showing an embodiment of the structure of the universal joint according to the present invention, and FIG. 2 is an exploded side sectional view of the structure of the universal joint according to the embodiment. The structure of this universal joint 1 is composed of a pair of pipes 2 and 3, and the respective end portions facing each other are pipe connection parts 4 and 5, and the respective pipe connection parts 4 and 5 are of the pipe body main body. The connection end faces 6 and 7 are formed so as to be inclined at a predetermined angle θ with respect to the tube axis direction, for example, 6 °, and are rotatably interconnected via the connection end faces 6 and 7.

A pipe connecting portion 4 of one pipe body 2 of each pipe body 2, 3.
Is an insertion port, and as shown in FIG.
A predetermined taper angle α tapering to the outer peripheral surface along the line, a taper portion 8 having the same angle 6 ° as the inclination angle θ of the connection end face 6 in this embodiment, in other words, the connection end face 6 as a reference plane and orthogonal to this. A taper portion 8 having a taper angle α when the direction of rotation is the axial direction is formed.

An annular groove 9 is formed along the connecting end face 6 on the tip side of the outer periphery of the taper portion 8, and a sealing rubber ring 10 such as an O ring is mounted as shown in FIG.

An engagement groove 11 is formed in the tapered portion 8 so as to extend parallel to the annular groove 9, and is engaged with the base end side of the tapered portion 8 outside the engagement groove 11. A coating flange 12 is formed so as to extend along the mating groove 11. The covering flange 12 may be provided with a rib 12a for reinforcement as shown in FIG.

The connecting end surface 6 which is the tip of the tapered portion 8 is formed to have a hollow concentric circle with a uniform width, and the opening (inner diameter portion) 6 in the connecting end surface 6 is formed.
a is formed into a substantially perfect circle, and as shown in FIG. 2, a clearance is provided between the engagement groove 11 and the annular groove 9 for reducing deformation of the one tube body 2 during injection molding. The groove 8a is formed.

Further, as shown in FIG. 1, the one tube body 2 is a bent tube in which the middle of the tube body is inclined at a predetermined angle γ with respect to the tube axis direction, 3 ° in this embodiment. Has been done.
This bending direction is opposite to the inclination direction of the connection end face 6 with respect to the pipe axis direction. That is, when the axis of the taper portion 8 is a vertical line with the connection end face 6 as a reference, the inclination of θ + γ from this midway portion. The axis is bent at an angle of 9 ° from the middle, and the tube end portion 4 ′ opposite to the tube connection portion 4 is a tube body that is oriented obliquely.

In this embodiment, as shown in FIG.
An enlarged diameter tapered surface 4a is formed in the bent portion, and a receiving port for connecting with another tube is formed on the tube end 4'side.

Next, the pipe connecting portion 5 of the other pipe body 3 of the respective pipe bodies 2 and 3 is an expanded diameter receiving port, and as shown in FIG. The divergence angle β having the same angle as the taper angle α of the taper portion 8, that is, the expanded diameter portion 13 having the same angle 6 ° as the inclination angle θ of the connection end surface 7, in other words, the connection end surface 7 as the reference surface The orthogonal direction is defined as the axial direction, and the enlarged diameter portion 13 having the divergence angle β with respect to the axial direction is formed to extend.

Further, the inner peripheral surface 1 of the tip edge of the expanded diameter portion 13
An engagement flange 14 having a claw-shaped cross section parallel to the connection end face 7 is formed on the protrusion 3a. In addition,
The protrusion amount of the engagement flange 14, that is, the inner diameter D2 at the tip of the engagement flange 14, is smaller than the outermost shape at the position of the engagement groove 11 of the tapered portion 8 as shown in FIGS. It is set and formed to be equal to or slightly larger than the outermost diameter D1 of the sealing rubber ring 10 mounted in the annular groove 9 of the taper portion 8.

The connecting end face 7 that is the bottom of the expanded diameter portion 13 is formed to have a hollow concentric circle of uniform width, like the connecting end face 6 of the taper portion 8 described above.
The opening (inner diameter portion) 7 a is the connecting end surface 6 of the taper portion 8.
Is formed into a substantially circular shape having the same diameter as the opening 6a.

A pipe end portion 5'opposite the pipe connecting portion 5 in which the expanded diameter portion 13 of the other pipe body 3 is formed is for connecting to another pipe body as shown in FIG. It is the entrance of.

Then, the insertion port, which is one of the pipe connecting portions 4, is
It is inserted into the receiving port which is the other pipe connecting portion 5, and as shown in FIG. 3, the engaging flange 14 of the enlarged diameter portion 13 is engaged with the engaging groove 11 of the taper portion 8 so as to be slidably fitted. To wear. In this fitted state, the sealing rubber ring 10 in the annular groove 9 is compressed and deformed into a watertight state as shown in FIG. 3, and in a straight state where both pipes 2 and 3 are not rotated, As shown in FIG. 1, the central axes L1 and L2 of the main bodies of the pipes 2 and 3 are on the same line, the pipes 2 are bent from the middle, and the pipe end 4 ′ of the pipe 2 is inclined by 3 °. It will be in the state of doing.

Therefore, in the structure of the universal joint 1 configured as described above, the insertion port which is one of the pipe connection portions 4 of the pair of pipe bodies 2 and 3 is inserted into the reception port which is the other pipe connection portion 5. When the engaging groove 14 of the taper portion 8 is engaged with the engaging flange 14 of the expanded diameter portion 13 to connect, the other pipe body 3 becomes rotatable with respect to the one pipe body 2, and the connecting end surfaces inclined with respect to each other. 6 and 7, the other (one) tube body is connected to the one (other) tube body at an angle of 0 to 2θ (see FIG. 4) at the connecting portion, that is, in the present embodiment, an arbitrary angle between 0 and 12 °. Can be freely adjusted, and at the tube end portions 4 ', 5'of the tube bodies 2, 3, as shown in FIG.
γ, that is, a bending angle of any angle between 3 and 15 ° in this embodiment can be freely adjusted and set.

Further, since one of the pipes 2 is bent in advance by a predetermined angle γ and the connecting end faces 6, 7 of the respective pipes 2, 3 are inclined at a predetermined angle θ, Maximum bending angle is 2θ + when the pipe is rotated 180 °
Since it can be set to γ, the inclination angles θ of the connection end faces 6 and 7 of the respective tube bodies 2 and 3 can be set small, and the shapes of the connection end faces 6 and 7 become substantially circular, and the connection end faces 6 and 7 can be further made. Since each of the openings 6a and 7a in FIG. 2 is formed into a substantially perfect circle, the inner surface of the connecting portion of the pipes 2 and 3 is in a smooth continuous state with no stepped portion, etc. Without doing so, it becomes an optimal flow path through which fluid such as drainage flows smoothly. Especially, it is suitable for a large-diameter pipe having a large diameter of the pipe body, and it becomes possible to configure a universal joint capable of gently changing the direction of the pipe line.

At the time of assembling the structure of the universal joint 1, that is, when one pipe connecting portion (insertion port) 4 is inserted into the other pipe connecting portion (reception port) 5, one pipe connection is made. The part (insertion port) 4 is formed with the taper part 8 having the taper angle α, and the other pipe connection part (reception port) 5 is formed with the expanded diameter part 13 having the expansion angle β, so that the part can be easily inserted and attached. The inner diameter of the engagement flange 14 projecting from the inner peripheral surface 13a of the expanded diameter portion 13 is formed to be equal to or slightly larger than the outermost diameter of the rubber seal ring 10 mounted on the tapered portion 8. Since the engagement flange 14 is engaged with the engagement groove 11 without being caught by the sealing rubber ring 10, the rubber ring 10 does not fall off during this mounting work.

In the above-described embodiment, the taper angle α of the taper portion 8 and the divergence angle β of the expanded diameter portion 13 are set to the same angle as the inclination angle θ of the connection end faces 6 and 7 and formed. As mentioned above, these taper angle α and divergence angle β
Even if the angle is not the same as the inclination angle θ, the same effect as described above can be obtained as long as it is formed at a predetermined angle. For example, as shown in FIG. 5, the taper angle α of the tapered portion 8 and the expanded diameter portion 13
When the relation is set to α> β with respect to the divergence angle β, a gap can be provided between the surface of the tapered portion 8 and the inner surface of the expanded diameter portion 13, whereby the annular groove 9 of the tapered portion 8 is formed.
It is possible to set a large volume of the sealing rubber ring 10 mounted on, and it is possible to improve the sealing property at this connecting portion.

Further, in the above-mentioned embodiment, the taper portion 8 and the enlarged diameter portion 13 have been described as simply inserted.
As shown in FIG. 3, when a protrusion 15 having a semicircular cross section or a ridge having a continuous cross section in the circumferential direction is formed on the distal end surface 13b of the expanded diameter portion 13, they are connected to each other in a connected state. The projections (protrusions) 15 make point contact or line contact with the covering flange 12 of the taper portion 8 and reduce frictional resistance when rotating the other tube body 3 with respect to the one tube body 2. be able to.

Further, in the above-described embodiment, the example in which only one tube body 2 is a bent tube which is inclined at a predetermined angle γ with respect to the tube axis direction in the middle is described. As in the case of the one tube body 2, the middle of the angle
It may be configured to be inclined and bent to form a bent tube. In this case, only one tube 2, only the other tube 3, both tubes 2,
3 can be configured as a bent tube,
Each combination can be arbitrarily selected.

Further, in the above-mentioned embodiment, the pair of tube bodies 2,
Although an example of the joint structure in which the connecting portions in 3 are adjustable in angle is described, one or the other pipe connecting portion may be formed in the drainage basin instead of the pipe bodies.

[0031]

As described above, in the structure of the universal joint according to the present invention, one pipe connecting portion is inserted into the other pipe connecting portion, and the engaging groove of the taper portion is provided with the engaging flange of the enlarged diameter portion. When engaged and connected, the other tube becomes rotatable with respect to the other tube, and the inclined end surfaces of the other allow one (the other) to freely bend at any angle. It can be adjusted and set to.

That is, when the inclination angle of each connecting end face is θ, the connecting end faces adjust one side (the other side) to the other side (one side) at a bending angle of any angle between 0 and 2θ. If one tube is a bent tube whose middle part is inclined at a predetermined angle γ with respect to the tube axis direction, a bending angle of any angle between γ and 2θ + γ is provided between the tubes. The effect is that it can be freely adjusted and set.

Further, from the above, the maximum bending angle of each tube can be an angle of 2θ plus the tilt angle γ, so that each tube can be bent and bent in advance. It is possible to set the inclination angle θ of the connection end face to be small so that the shape of the connection end face can be formed close to a perfect circle, and each opening in the connection end face is formed to be a substantially perfect circle. Therefore, the state of the inner surface at the connecting part of these pipes will be a smooth continuous state without steps, etc., and it will be a flow path that allows smooth flow of fluid such as drainage without catching sediments and foreign substances There is an effect that can be.

When the structure of this universal joint is assembled,
That is, when inserting one pipe connecting portion into the other pipe connecting portion, one pipe connecting portion is formed with a taper portion with a taper angle α, and the other pipe connecting portion has a diverging portion with a divergence angle β. Since it is formed, it can be easily inserted and engaged, and the inner peripheral surface of the enlarged diameter portion can be engaged with each other without coming into contact with the sealing rubber ring attached to the taper portion. This has the effect that the rubber ring does not fall off during work.

Thus, the piping work does not become complicated, and the direction of the pipe can be easily changed to an arbitrary angle.

[Brief description of drawings]

FIG. 1 is a side sectional view showing an embodiment of the structure of a universal joint according to the present invention.

FIG. 2 is an exploded side sectional view showing a structure of a universal joint according to the embodiment.

FIG. 3 is a partially enlarged side sectional view of the structure of the universal joint according to the embodiment.

FIG. 4 is a side sectional view showing a usage state of the structure of the universal joint according to the embodiment.

FIG. 5 is a partially enlarged side sectional view of the structure of a universal joint according to another embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Universal joint 2 ... One tubular body 3 ... The other tubular body 4 ... One tubular connecting part 5 ... The other tubular connecting part 6 ... One connecting end surface 6a ... Opening 7 ... The other connecting end surface 7a ... Opening 8 ... Tapered portion 13 ... Expanded portion α ... Taper angle β ... Spread angle γ ... Inclination angle θ ... Inclination angle

Claims (1)

[Claims] 1. A connecting end face inclined at a predetermined angle θ with respect to the pipe axis direction, and a taper portion having a predetermined taper angle α is formed on an outer peripheral surface along the connecting end face, and the connecting end face has a tapered portion. One of the pipe bodies having a pipe connection portion whose opening is formed in a substantially perfect circle, and a connection end face inclined at a predetermined angle θ with respect to the pipe axis direction, and a divergence angle β of a predetermined angle from the connection end face. An enlarged diameter part of the pipe is extended and the opening at the connection end face has another pipe body having a pipe connection part formed in a substantially perfect circle having the same diameter as the opening of the one pipe body, One tube body and / or the other tube body is a bent tube whose middle is inclined at a predetermined angle γ with respect to the tube axis direction, and the one tube body and the other tube body Are rotatably connected to each other via the connection end faces. The structure of the universal joint.