JPS6144070Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is a flexible pipe joint that can be used for swing connections of steel pipes instead of rubber hoses in piping structures that use water, air, gas, hot water, high-temperature steam, etc. as fluids. , regarding its connection structure.

Conventional rotary joints use coil springs or disc springs as pressure contact means for sealing structure in order to prevent fluid leakage, but in this rotary joint, one joint pipe is fixed and the other joint pipe is fixed. Since the pressure welding means only needs to be rotated, it only needs to have the function of applying elastic force in the axial direction.Therefore, there is a choice between using a coil spring or a disc spring as the pressure welding means. has no particular meaning.

However, in the case of a universal pipe joint that allows the joint pipes to swing relative to each other, as shown in the usage example shown in Fig.
Since the coil spring can move in any direction (direction) and bending, using a coil spring as the pressure contact means causes problems in various aspects. In other words, a coil spring has a winding direction, so if the rotating direction of the joint tube is opposite to the winding direction, a force in the unwinding direction will act on the coil spring, potentially causing the coil spring to break. Moreover, due to the bending action of the joint pipe, the deflection clearance changes around the outer circumference, which not only causes a bias in the elastic force in the axial direction, but also makes it impossible to store it compactly.

On the other hand, when a disc spring is used, there is no problem due to forward and reverse rotation, there is no change in the deflection gap due to bending motion, and furthermore, it is possible to make the spring more compact. Therefore, in this invention, we focused on the advantages of this disc spring, and not only use it as a pressure welding means, but also to make the swing of the universal pipe joint smooth, prevent accidents such as breakage, and make it compact. This was adopted as one of the essential structural requirements to achieve this goal.

Another object of the present invention is to provide a dust seal part to prevent dust in the fluid from entering the seal part, etc., to prevent debris from entering the fluid when the Belleville spring breaks unexpectedly. In addition, the fluid pressure is used as the contact force of the seal part, smoothing the flow of fluid, increasing the surface area of the seal part to improve the sealing effect, and stabilizing the bearing function of the seal part. It has a purpose.

That is, in order to achieve this object, the connection structure for the universal pipe joint of the present invention is such that, in the universal pipe joint J in which joint pipes are connected to each other in a swingable manner, a housing 2 is formed at the joint part, and One joint pipe A has a spherical seat 3 provided in the inner part of the housing 2; it is fitted into the housing 2, and in the fitted state, the ball of the sealing surface 5a is aligned with the ball of the spherical seat 3. A seal ring 5 is arranged to substantially coincide with the center of the seal ring;
The other joint pipe B has a spring accommodating space 8 formed on the inner periphery of the connecting portion; a hemispherical surface 10 that faces the spherical seat 3 protrudes from one end. and a spring receiving tube C whose other end is fitted to the inner periphery of the joint tube B with a slight gap t; A disc spring 11 is interposed between the receiving pipe C and the joint pipe B, and the hemispherical surface 7 of the joint pipe B is pressed against the sealing surface 5a of the seal ring 5 by the elastic force of the disc spring 11. At the same time, the hemispherical surface 10 of the spring receiving tube C is brought into pressure contact with the spherical seat 3, and the flow paths a and b of the joint tubes A and B are connected straight through the spring receiving tube C.

An embodiment of the present invention will be described below with reference to the drawings.

Figure 1 shows a universal pipe joint J that is an embodiment of the present invention.
FIG.

In the figure, A is one joint pipe, one end of which is formed with a threaded hole 1 as a pipe connection port, the other end is a connection part, a housing 2 is formed in this connection part, and the inner part of this housing 2 is A spherical washer 3a serving as a spherical seat portion 3 is provided at the spherical seat portion 3.
In addition, a is the flow path of the joint pipe A, and 4 is the palate of the housing 2.

Reference numeral 5 denotes a seal ring, which is fitted into the housing 2 and whose sealing surface 5a is formed into a spherical surface.
It is made to approximately match the center of the sphere.

B is the other joint pipe, which has a threaded hole 6 formed at one end as a pipe connection port, and has a hemispherical surface 7 protruding from the outer periphery of this connecting portion at the other end, and this hemispherical surface 7 is formed as described above. A spring accommodating space 8 is formed on the inner periphery of the connecting portion while facing the sealing surface 5a of the seal ring 5, and a fitting hole 9 is further formed from the back of this spring accommodating space 8.
Note that b is the flow path of the joint pipe B.

Reference numeral C designates a spring receiving tube, one end of which has a protruding hemispherical surface 10 that faces the spherical seat 3, the other end of which is fitted into the fitting hole 9 with a slight gap t, and this spring receiving tube. Through the pipe C, the flow paths a and b of the joint pipes A and B are connected in a straight line.

Reference numeral 11 denotes a disc spring, which is fitted around the outer periphery of the spring receiving tube C, and is inserted into the coupling tube B in the spring housing space 8.
and the spring receiving tube C.

Then, the hemispherical surface 7 of the joint pipe B is brought into pressure contact with the sealing surface 5a of the seal ring 5 while urging the joint pipe B and the spring receiving pipe C in the direction of separation by the elastic force of the disc spring 11, In addition, the hemispherical surface 10 of the spring receiving tube C is brought into pressure contact with the spherical seat portion 3.

The spherical seat 3 prevents dirt in the fluid from entering the seal portion, disc spring portion, etc. between the bearing action of the spring receiving tube C and the hemispherical surface 10 of the spring receiving tube C. It functions as a garbage seal.

Further, the seal ring 5 constitutes a sealing structure between the bearing action of the joint pipe B and the hemispherical surface 7 of the joint pipe B.

Therefore, in the above-mentioned universal joint J, since the disc spring 11 is used as the pressure contact means, there is no possibility that problems will occur due to mutual forward and reverse rotation of the joint pipes A and B, and the spring receiving pipe Since C is fitted into the joint pipe B, there is no change in the deflection clearance of the disc spring 11 even during bending, and the elastic force is applied accurately in the axial direction to achieve the sealing function. Moreover, there is no inconvenience that would impede the bearing function. In addition, the disc spring 11
can be stored compactly in the spring housing space 8, so the hemispherical surface 7 of the joint pipe B can be made wider while the entire joint is configured compactly.
This increases the sealing area and improves the sealing effect, as well as making the swinging motion of the joint pipes A and B smooth and stable. In addition, since the spring receiving tube C is fitted to the inner circumference of the joint tube B, even if the disc spring 11 is accidentally broken, the spring receiving tube C acts as a wall to prevent debris from entering the flow path. Moreover, since the flow paths a and b are connected in a straight line through the spring receiving tube C, the fluid can flow smoothly. Also, since the spring receiving tube C is fitted to the joint tube B with a gap t maintained,
The fluid that has entered from within this gap t can be used as a pressure welding means.

One embodiment of the present invention has been described above, but
The specific configuration of the present invention is not limited to the above embodiments.

For example, depending on the required pressing force, the disc spring 11 may be used alone, or two disc springs may be combined in an opposing state as shown in FIG. 2, or as shown in FIG. 3. Several disc springs may be combined, or even several disc springs may be stacked in the same direction and combined in several stages as shown in Figures 4 and 5. .

Further, in the embodiment, the spherical seat part 3 is formed by the spherical washer 3a, but this spherical seat part 3 is
The inner surface may be formed by spherical processing.

As explained above, according to the present invention, a disc spring is used as the pressure welding means, and the disc spring is fitted into the spring receiving pipe, so that the swinging motion that is unique to a universal pipe joint is avoided. It is possible to fully respond to this, to achieve a reliable sealing effect, and to properly perform the bearing function, thereby making the rocking motion smooth. In addition to this, the combination of disc springs and spring receiving tubes allows for garbage sealing, compactness,
It has many effects such as expanding the sealing area, smoothing the flow of fluid, preventing debris from entering when the disc spring breaks, and utilizing fluid pressure.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a universal pipe joint that is an embodiment of the present invention, Figs. 2, 3, 4, and 5 are views each showing a combination of disc springs, and Fig. 6 is a sectional view of a universal pipe joint that is an embodiment of the present invention. It is a side view showing an example of use of a pipe joint. J...Universal pipe joint, A...Joint pipe, a...flow path, B...joint pipe, b...flow path, o...ball center, t
...Gap, 2...Housing, 3...Spherical seat,
5... Seal ring, 5a... Seal surface, 7...
Hemispherical surface, 8... Spring accommodation space, 10... Spherical seat, 11... Disc spring.

Claims (1)

[Scope of utility model registration request] In a universal pipe joint J in which joint pipes are connected to each other in a swingable manner, a housing 2 is formed at the connecting part, and one joint pipe A is provided with a spherical seat part 3 in the inner part of the housing 2; A seal ring 5 is fitted into the housing 2, and in the fitted state, the spherical center of the sealing surface 5a substantially coincides with the spherical center of the spherical seat 3; The other joint pipe B has a hemispherical surface 7 facing the sealing surface 5a of the seal ring 5 in the housing 2, and has a spring accommodating space 8 formed on the inner periphery of the connecting portion; the spherical seat portion 3; A spring receiving tube C having a hemispherical surface 10 protruding from one end and having the other end fitted to the inner periphery of the joint pipe B with a slight gap t; A disc spring 11 is fitted and interposed between the spring receiving pipe C and the joint pipe B in the spring housing space 8; and the elastic force of the disc spring 11 causes the hemisphere of the joint pipe B to The surface 7 is brought into pressure contact with the sealing surface 5a of the seal ring 5, and the hemispherical surface 10 of the spring receiving tube C is brought into contact with the spherical seat portion 3.
and the flow paths a and b of the joint pipes A and B
A connection structure in which the two are connected in a straight line through a spring receiving tube C.