Pipe joints or couplings – Particular interface – Annular socket
Reexamination Certificate
2000-03-16
2003-02-04
Binda, Greg (Department: 3679)
Pipe joints or couplings
Particular interface
Annular socket
C285S919000
Reexamination Certificate
active
06513839
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a pipe joint made of resin, and particularly to a pipe joint made of resin which is used in the connection of piping for a liquid having high purity or ultrapure water to be handled in a production process of various technical fields such as the production of semiconductor devices, the production of medical equipment and medicines, food processing, and for use in the chemical industry.
2. Description of the Prior Art
Conventionally, as pipe joints made of resin of this kind, those having a configuration shown in
FIG. 3
are known. A conventional pipe joint made of resin shown in
FIG. 3
comprises a cylindrical joint body
1
produced from resin having excellent chemical resistance and heat resistance, such as PFA, PTFE, and ETFE, a sleeve-like inner ring
8
, and a cap nut-like pressing ring
9
.
In the joint body
1
, in the case where the joint body
1
is continuously integrated with a fluid apparatus which is not shown, a cylindrical pipe receiving port
2
is formed in one end in the axial direction, and, in the case where the joint body
1
is used for connecting together resin pipe members that will be described later, pipe receiving ports
2
are formed in the ends in the axial direction, respectively. An inclined sealing face
4
which elongates in a direction intersecting the axis C and forms a tertiary sealing portion
5
C that will be described later is formed in the inlet of the pipe receiving port
2
. An annular sealing end face
6
which forms a primary sealing portion
5
A that will be described later is formed in an inner portion of the pipe receiving port
2
. A cylindrical groove
7
which forms a secondary sealing portion
5
B that will be described later is formed in a position which is outer than the annular sealing end face
6
in a radial direction. An external thread portion
3
is formed on the outer periphery of the pipe receiving port
2
.
The sleeve-like inner ring
8
is formed so as to have an inner diameter which is equal to the inner diameters of a resin pipe member
10
and a cylinder portion
1
A of the joint body
1
, so as not to impede movement (flow) of a fluid. The inner ring has a fitting portion
11
in one end portion in the axial direction. The fitting portion can be fitted into the pipe receiving port
2
of the joint body
1
. A bulge portion
13
which has a mountain-like section shape is formed on the outer periphery on the tip end side of a pipe member press insertion portion
12
which is formed continuously with the fitting portion
11
. An insertion portion
15
of the pipe member
10
is formed which is to be inserted into the pipe receiving port
2
of the joint body
1
, and which has an outer peripheral sealing face
14
. When the press insertion portion
12
is pressingly inserted into one end portion of the pipe member
10
under a state where the fitting portion
11
projects from the end portion of the pipe member
10
, the diameter of the peripheral wall of the pipe member
10
in a place corresponding to the bulge portion
13
is increased to cause the outer peripheral sealing face
14
to abut against the inclined sealing face
4
in the axial direction which is formed in the inlet of the pipe receiving port
2
of the joint body
1
, thereby forming the tertiary sealing portion
5
C.
In the fitting portion
11
which projects from the pipe member
10
of the inner ring
8
, a protruding inner end face
16
is formed. When the insertion portion
15
of the pipe member
10
is inserted into the pipe receiving port
2
of the joint body
1
, the protruding inner end face
16
abuts against the annular sealing end face
6
in the axial direction to form the primary sealing portion
5
A. Each of the protruding inner end face
16
and the annular sealing end face
6
is formed into a tapered face in which the diameter is gradually reduced toward the inner periphery side. A cylindrical sealing portion
17
which projects more outwardly in the axial direction than the protruding inner end face
16
configured by a tapered face is integrally projected from a position of the protruding inner end face
16
on the outer side in a radial direction. The cylindrical sealing portion
17
is to be pressingly inserted into the cylindrical groove
7
to form the secondary sealing portion
5
B. A chamfered portion
17
a
is formed at the tip end of the cylindrical sealing portion
17
so as to facilitate the pressing insertion of the sealing portion into the cylindrical groove
7
.
In the cap nut-like pressing ring
9
, an internal thread portion
18
which is to be screwed to the external thread portion
3
of the joint body
1
is formed in the inner peripheral face of a cylindrical portion
9
A, and an annular pressing portion
9
B is continuously integrated with an outer end portion of the cylindrical portion
9
A. The annular pressing portion
9
B elongates toward the axial center and externally presses the pipe member
10
. An inner peripheral face
9
b
of the annular pressing portion
9
B elongates along the axial direction and is formed into a funnel-like tapered face so as to form a pressing edge
9
C in an inner edge position of the face.
In the thus configured pipe joint made of resin, the press insertion portion
12
of the inner ring
8
is pressingly inserted into the one end portion of the pipe member
10
to increase the diameter of the peripheral wall of the pipe member
10
in a place corresponding to the bulge portion
13
formed in the press insertion portion
12
, whereby both the components
8
and
10
are integrally coupled together to form the insertion portion
15
of the pipe member
10
.
The insertion portion
15
of the pipe member
10
is then inserted into the pipe receiving port
2
of the joint body
1
to advance the cylindrical sealing portion
17
of the inner ring
8
into the cylindrical groove
7
of the joint body
1
.
Thereafter, the internal thread portion
18
of the pressing ring
9
which is loosely fitted onto and held on the outer side of the pipe member
10
is screwed to the external thread portion
3
of the joint body
1
to cause the pressing ring
9
to screwingly advance toward the joint body
1
. Therefore, the inner ring
8
is pressed in the axial direction by the pressing edge
9
C of the annular pressing portion
9
B, so that the cylindrical sealing portion
17
of the inner ring
8
is inserted starting from the chamfered portion
17
a
at the tip end into the cylindrical groove
7
of the joint body
1
. As a result, a contact pressure is generated between the inner and outer peripheral faces of the two components
7
and
17
, thereby forming the secondary sealing portion
5
B which elongates in the axial direction.
The pressing ring
9
is further screwingly advanced to be strongly tightened. As a result, the axial length of the secondary sealing portion
5
B is increased, and the protruding inner end face
16
of the inner ring
8
abuts against the annular sealing end face
6
of the pipe receiving port
2
of the joint body
1
to generate a contact pressure in the axial direction between the components
16
and
6
, thereby forming the primary sealing portion
5
A. Furthermore, the outer peripheral sealing face
14
which is formed on the insertion portion
15
of the pipe member
10
abuts in the axial direction against the inclined sealing face
4
which is formed in the inlet of the pipe receiving port
2
of the joint body
1
, thereby forming the tertiary sealing portion
5
C. As a result, the pipe member
10
is connected to the joint body
1
under a slipping off preventing state and a sealed state.
As seen from the model view of
FIG. 4
, in the pipe joint made of resin of the conventional art, usually, no consideration is given to the dimension of the inner diameter To of the annular pressing portion
9
B of the pressing ring
9
with respect to the outer diameter t of the pipe member
10
, or the relationship of To<t is set. The inner peripheral face
9
b
of the a
Binda Greg
Jones Tullar & Cooper P.C.
Nippon Pillar Packing Co. Ltd.
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