JPH0423157B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a synthetic resin pipe joint for connecting connecting pipes to connecting pipes, or connecting pipes to connecting parts such as devices.

BACKGROUND ART Conventionally, this type of pipe joint has been known to have various structures. For example, as shown in Figures 5 and 6,
Seal ring 23 with a wedge-shaped tip
is fitted onto the outer peripheral surface of the connecting pipe 24, and this connecting pipe 24
Connect the tip end to the connecting cylinder part 2 of the synthetic resin joint body 21.
1a, and a synthetic resin tightening ring 2.
2 to the joint body 21 by hand, and press the seal ring 23 axially toward the joint body side with the tightening ring 22, so that the tip of the seal ring 23 is connected to the outer peripheral surface of the connecting pipe 24 and the At the same time, the seal ring 23 is pressed into contact with the outer circumferential surface of the connecting tube 24, and the connecting tube 24 is closed due to the frictional force between the two members. Some are designed to prevent them from slipping out of the joint.

However, in the above structure, the connecting pipe 2
4, or if an external force is applied to the connecting pipe 24 in the axial direction and in the direction away from the pipe fitting, the connecting pipe 24 may slip out of the seal ring 23 and come off the pipe fitting. A big problem arose.

Therefore, as shown in FIGS. 7 and 8, the tightening ring 25
A protrusion 25b that protrudes annularly toward the joint body is formed on the flange 25a at one end of the joint body, and when tightening, the tip of the protrusion 25b is connected to the inner peripheral surface of the connecting cylinder of the joint body 21 and the connecting pipe. 24 to seal the gap between both members, and the tip of the protrusion 25b to bite into the outer circumferential surface of the connecting tube 24 to prevent the connecting tube 24 from slipping out in the axial direction. There is something I did.

Problems to be Solved by the Invention By the way, generally speaking, the tightening ring 25 is attached to the joint body 21.
In order to ensure reliable threading, it is necessary to use a rigid material. Then, in the structure described above, if the tightening ring 25 is formed with rigidity, the protrusion 25b will also have rigidity.
1 and the connecting pipe 24, a large force is required, and there was a problem that the tightening ring 22 could not be screwed into the joint body 25 without using a tool such as a wrench.

Therefore, the inventor of the present invention has discovered that the tightening ring and the protrusion, as well as the sealing member, may be made into separate members.

However, if the sealing part is formed as a separate member from the tightening ring, when the sealing member is fitted into the connecting pipe 24, the tip of the sealing member is attached to the connecting pipe 24.
It is necessary to fit it so as to bite into it, and this problem arises if this fitting operation becomes complicated.

Therefore, an object of the present invention is to solve the above-mentioned problems, and it is possible to easily tighten the tightening ring to the joint body by hand, and to effectively prevent the connecting pipe from coming off. Another object of the present invention is to provide a pipe joint in which a sealing member can be easily inserted into a connecting pipe.

Means for Solving the Problems In order to achieve the above object, the present invention provides a sealing member with a movable locking protrusion, and connects the sealing member when the locking protrusion is in the retracted position. When inserted into a pipe and tightened, the locking ring moves the locking protrusion of the seal member to the locking position to restrict movement of the connecting pipe and prevent it from coming off. That is, a joint main body having a connecting cylinder part with a threaded part formed on the outer peripheral surface, a tightening cylinder part having a female threaded part formed on the inner peripheral surface to be screwed into the male thread part, and an end of the tightening cylinder part. a tightening ring having a flange formed integrally with the connecting pipe and projecting toward the center in the radial direction; a sealing member having a wedge portion that is wedged between the inner circumferential surface of the connecting cylinder portion of the joint body and the outer circumferential surface of the connecting pipe, and that is brought into close contact with the inner circumferential surface of the connecting cylinder portion,
The sealing member is fitted into the connecting pipe, and the sealing member and the connecting cylinder portion of the fitting body are inserted into the tightening ring, and the female thread portion of the tightening ring and the male thread portion of the fitting body are inserted into the tightening ring. and press the sealing member toward the joint body with the collar of the tightening ring so that the sealing member bites between the inner peripheral surface of the connecting cylinder of the joint body and the outer peripheral surface of the connecting pipe. In the pipe joint in which the connecting pipe and the joint body are connected in close contact with each other, the sealing member has the other end thereof locked in a recess of the connecting pipe to prevent movement of the connecting pipe in the axial direction. The locking protrusion is movable between a restricting locking position and an unlocked retracted position, and the locking protrusion is in contact with the end surface perpendicular to the connecting pipe axis of the recess of the connecting pipe in the locking position. The locking protrusion has a locking surface that can be locked, and the inner edge of the connecting tube can come into contact with the outer surface of the wedge part at the locking position, while the tightening ring has a locking surface that can be locked. The inner surface of the collar portion is provided with an inclined surface that presses the locking protrusion and moves the locking protrusion from the retracted position to the locking position.

Effect of the Invention In the above configuration, first, the sealing member and the tightening ring are respectively fitted to the connecting pipe. At this time, the locking protrusion of the seal member is placed in the retracted position to smoothly insert the seal member into the connecting pipe. After that, the tip of the connecting pipe is inserted into the connecting cylinder of the joint body, the sealing member is inserted into the tightening ring, and the tightening ring is rotated to tighten the tightening tube of the tightening ring. The female threaded portion of the joint body and the male threaded portion of the connecting cylinder portion of the joint body are screwed together, and the tightening ring is rotated and moved toward the joint body side along the axial direction. Then, the other end of the sealing member is pressed by the inclined surface of the inner surface of the flange of the tightening ring to move the locking protrusion of the sealing member from the retracted position to the locking position. When this locking protrusion is located at the locking position, the locking protrusion bites into the outer peripheral surface of the connecting pipe or fits into a pre-formed recess in the connecting pipe, allowing the connecting pipe to move in the axial direction. This prevents the connecting pipe from coming out of the sealing member in the axial direction. On the other hand, due to the movement of the tightening ring, the wedge portion at one end of the sealing member bites between the connecting tube of the joint body and the connecting tube and comes into close contact with both members, and the wedge portion at one end of the sealing member fits tightly between the connecting tube and the connecting tube. Seal the space between them.

Examples Examples according to the present invention will be described in detail below with reference to FIGS. 1 to 12.

As shown in FIGS. 1 and 2, the pipe joint according to this embodiment has a sealing member 3 having a wedge portion 3a and a locking protrusion 3b fitted into a connecting pipe 4.
After inserting the tip into the connecting cylinder portion 1a of the joint body 1, the tightening ring 2 fitted to the connecting pipe 4 is placed over the seal member 3 and inserted into the inside of the joint body 1. The wedge portion 3a at the tip of the seal member 3 is bitten between the connecting pipe 4 and the joint body 1 to seal the space between the two members 4 and 1, and the rear end of the seal member 3 is screwed together and tightened. The locking protrusion 3b of the connecting tube 4 is fitted into the recess 4a on the outer peripheral surface of the connecting tube 4, so that the connecting tube 4 is prevented from coming off from the tightening ring 2.

The joint body 1 is made of a synthetic resin cylindrical body in which a thick-walled cylindrical portion 1d and connecting cylindrical portions 1a having a thinner wall than the thick-walled cylindrical portion 1d are integrally formed on both sides of the thick-walled cylindrical portion 1d. Each connecting cylindrical portion 1a has a threaded portion 1b on its outer circumferential surface, and a guide surface 1 inclined at the edge of the end opening of the cylindrical portion.
c to facilitate insertion of the connecting tube 4 into the connecting cylinder portion 1a. In addition, the above-mentioned connecting cylinder portion 1
The inner diameter of a is made larger than the outer diameter of the connecting pipe 4, so that a slight gap 6 is formed between the two members 1 and 4.

The tightening ring 2 includes a tightening cylindrical portion 2a and a tightening cylindrical portion 2.
It is made of a synthetic resin cylindrical body integrally formed with a thick-walled flange 2c extending toward the center in the radial direction at the end of a. The inner circumferential surface of the tightening cylindrical portion 2a has a female threaded portion 2b which is screwed into the male threaded portion 1b. The flange portion 2c has a through hole 2e in the center thereof having a diameter larger than the outer diameter of the connecting tube 4, and allows the connecting tube 4 to be freely inserted into the through hole 2e. Further, the inner surface of the collar portion 2c on the tightening tube side forms an inclined surface 2d that is inclined as it goes from the through hole 2e toward the tightening tube portion 2a.

The sealing member 3 includes an annular wedge portion 3a having a wedge-shaped cross section at one end, and the wedge portion 3a having a wedge-shaped cross section.
a and an annular locking protrusion 3b connected via an annular connection part 3f.
When the wedge portion 3a is tightened, it is pressed by the tightening ring 2 so as to bite into the space 6 between the connecting pipe 4 and the connecting cylinder portion 1a of the joint body 1, and is pressed by the tightening ring 2, so that The members 4 and 1 are brought into close contact to seal the space between them. As shown in FIGS. 3 and 4, the locking protrusion 3b is located at a retracted position A located outside the connecting pipe 4.
and a locking position B where it bites into the connecting pipe 4, so that the connecting portion 3f can freely move relative to the wedge portion 3a. The locking protrusion 3b may be formed by, for example, integrally molding the wedge portion 3a and the locking protrusion 3b so as to form a notch 3c between the wedge portion 3a and the locking protrusion 3b, or forming the notch after molding. 3
The protrusion 3b can be formed by any method such as forming the protrusion 3b by cutting. The above locking protrusion 3
In the retracted position A, b has its outer peripheral surface formed into a flat end surface 3d, and an inclined surface 3 inclined radially outward from the center side at the opening edge of the locking protrusion 3b.
e, so that the connecting pipe 4 can be easily inserted into the sealing member 3, and the locking protrusion 3
b moves from the retracted position A to the locking position B so that it can be smoothly fitted into the recess 4a of the connecting pipe 4, which will be described later. At the locking position B of the locking protrusion 3b,
The locking protrusion 3b moves to such an extent that both the cutout end surfaces of the locking protrusion side and the wedge side end surface of the cutout 3c come into contact with each other. On the other hand, in the retracted position A of the locking protrusion 3b, the end of the inclined surface 3e on the connecting pipe side is located approximately on the outer circumferential surface of the connecting pipe 4 as shown in FIG. The connecting pipe side end of the inclined surface 3e may be located at a position farther away from the outer circumferential surface.

On the other hand, an annular recess 4a having an end face 4b perpendicular to the axis of the connecting pipe is formed on the outer circumferential surface of the connecting pipe 4 at a portion where the locking protrusion 3b of the seal member 3 locks. The stop protrusion 3b is connected to the connecting pipe 4
The locking surface 3g that fits into the recess 4a and faces the notch 3c of the locking protrusion 3b is connected to the connecting pipe 4.
By abutting and locking the end surface 4b of the recess 4a perpendicular to the connecting tube axis, movement of the connecting tube 4 in the axial direction with respect to the sealing member 3 is more reliably regulated.

The members 1, 2, 3, and 4 are made of synthetic resin such as fluororesin, polypropylene, and polyethylene.

Now, when connecting the connecting pipe 4 and the connecting pipe 4 or the connecting pipe 4 and the connecting part of the device using the pipe joint described above, first, connect the connecting tube 1a to one of the connecting cylindrical parts 1a of the joint main body 1 of the pipe joint according to the above structure. Connect 4. That is, the tightening ring 2 and the sealing member 3 are respectively fitted onto the outer peripheral surface of the connecting pipe 4 to be connected. At this time, since the locking protrusion 3b of the seal member 3 is located at the retracted position A, the locking protrusion 3b does not interfere with the above-mentioned insertion operation. After the sealing member 3 is positioned near the recess of the connecting tube 4, the distal end of the connecting tube 4 is inserted into one connecting cylinder portion 1a of the upper joint main body 1.
This connecting pipe 4 is inserted into the connecting cylinder part 1a so that a certain distance 5 is formed between the tip of the connecting pipe 4 and the inner surface of the thick-walled cylinder part 1d. Next, the tightening cylindrical portion 2 of the tightening ring 2 is attached to the joint body 1.
The tightening cylinder part 2 of the tightening ring 2 is placed over the connecting cylinder part 1a and the sealing member 3 and turned by hand.
The female threaded portion 2b of a and the male threaded portion 1b of the connecting cylinder portion 1a of the joint body 1 are screwed together. As a result, the tightening ring 2 gradually moves toward the joint body in the axial direction, and the rear end of the locking protrusion 3b of the sealing member 3 is pressed by the inclined surface 2d of the collar 2c of the tightening ring 2. The locking protrusion 3b is moved to the connecting pipe side and a part of the locking protrusion 3b is fitted into the recess 4a of the connecting pipe 4, and the locking protrusion 3b is removed.
from the retracted position A to the locking position B. In this locking position B, the flat end surface 3d of the locking protrusion 3b contacts the slope 2d of the collar 2c of the tightening ring 2 and is pressed, and the slope 3e of the locking projection 3b contacts the slope 2d of the flange 2c of the tightening ring 2 and is pressed. At the same time, the locking surface 3g of the locking protrusion 3b abuts and locks the end surface 4b of the recess 4a of the connecting pipe 4. On the other hand, after the locking protrusion 3b is located at the locking position B, the movement of the tightening ring 2 causes the collar portion 2 to
The sealing member 3 is pressed by the inclined surface 2d of c, and the connecting pipe 4 together with the sealing member 3 moves slightly toward the joint body in the axial direction, so that the wedge portion 3a of the sealing member 3 is pressed against the connecting cylinder portion 1a of the joint body 1. Guided by the guide surface 1c, the sealing member 3 bites between the inner circumferential surface of the connecting cylinder and the outer circumferential surface of the connecting tube 4, and the sealing member 3 comes into close contact with both the members 1 and 4, thereby sealing the space between the members 1 and 4. If it is difficult to fit the locking protrusion 3b of the seal member 3 into the recess 4a of the connecting pipe 4, the tightening ring 2 may be tightened during or after tightening the tightening ring 2. By forcibly moving the connecting pipe 4 slightly in the axial direction with respect to the attached ring 2 with a large force, the sealing member 3
The locking protrusion 3b may be fitted into the recess 4a of the connecting pipe 4.

Next, the other connecting cylinder part 1 of the joint body 1 of the pipe joint
Connect the other connecting pipe 4 to a in the same way as above, or
Alternatively, the other connecting cylinder portion 1a of the joint body 1 is connected to a connecting portion of a desired device. If the seal between the joint body 1 and the connecting pipe 4 becomes poor during use, rotate the tightening ring 2 further in the tightening direction to tighten the seal member 3 together with the connecting pipe 4. The wedge portion 3a of the seal member 3 may be brought into close contact with the connecting cylinder portion 1 of the joint body 1 and the connecting pipe 4 with even greater force by slightly moving it toward the main body.
In order to perform this work, the connecting pipe 4
and the inner surface of the thick-walled cylindrical portion 1d of the joint body 1.
It is necessary to form 5.

According to the above embodiment, the seal member 3 is connected to the connecting pipe 4.
When inserting the locking protrusion 3 of the seal member 3 into the
b is located at the retracted position A, there is no problem with the insertion work, while the locking protrusion 3 is secured by the tightening ring 2.
When b is pressed and moved from the retracted position A to the locking position B, the locking protrusion 3b fits into the recess 4a of the connecting tube 4, effectively preventing the connecting tube 4 from moving in the axial direction. The connecting tube 4 can be held in position relative to the clamping ring 2. Further, the locking protrusion 3b fits into the recess 4a of the connecting pipe 4, and the notch 3c of the locking protrusion 3b
Since the locking surface 3g facing the connecting tube 4 contacts and locks the end surface 4b perpendicular to the connecting tube axis of the recess 4a of the connecting tube 4, the movement of the connecting tube 4 relative to the sealing member 3 in the axial direction can be reliably regulated. . Furthermore, since the inner edge 1e of the connecting cylinder 1a can come into contact with the outer surface of the wedge portion 3a at the locking position B, the inner edge 1e functions as a wedge for the sealing member 3 to seal the sealing member 3. The effect can be further improved. Furthermore, since the sealing member 3 that prevents the connecting pipe 4 from coming off and the clamping ring 2 are constructed as separate members 3, even if the clamping ring 2 is made of a rigid material, the sealing member 3 is not very rigid. If the material is made of a material that does not have any It is also possible to effectively perform a sealing action.

Note that the present invention is not limited to the above-mentioned embodiments, and can be implemented in various other embodiments.

For example, when performing tightening work by rotating the tightening ring 2, the wedge portion 3a of the seal member 3 is connected to the connecting cylinder portion 1a of the joint body 1 and the connecting pipe 4.
After the sealing action is performed by biting in between the connecting pipe 4 and the connecting pipe 4, the locking protrusion 3b may perform the locking action on the connecting pipe 4, or both actions may be performed simultaneously. Further, the locking protrusion 3b is not limited to an annular body, but may be one in which gaps are formed at regular intervals along the circumferential direction. Further, the movement of the connecting tube 4 in the axial direction may be restricted by not forming the concave portion 4a in advance in the connecting tube 4 and letting the locking protrusion 3b of the sealing member 3 bite into the connecting tube 4.

Further, in the sealing member 3, the connecting portion 3f between the wedge portion 3a and the locking protrusion 3b may be formed along the inner peripheral surface instead of along the outer peripheral surface. That is, as shown in Figures 9 and 10,
The notch 3c is formed not from the inner circumferential side of the seal member 3 but from the outer circumferential side, and the locking protrusion 3b is moved from the retracted position A to the locking position B by pressing the inclined surface 2d of the tightening ring 2. It may also be possible to move up to

Further, as shown in FIGS. 11 and 12, a notch 3c is formed along the axial direction from the rear end surface of the seal member 3, and an annular locking protrusion 3b is provided on the radial center side of the notch 3c. , the collar portion 2c of the tightening ring 2
An annular protrusion 2f that can be inserted into the notch 3c is provided on the inner surface of the annular protrusion 2f. It may also be configured with the following. In such pipe fittings, when tightening,
When the sealing member 3 is pressed by the tightening ring 2, the annular protrusion 2f moves into the notch 3 of the sealing member 3.
c, the locking protrusion 3b is pressed toward the connecting pipe by the inclined surface 2d, and moves from the retracted position A to the locking position B. Note that the annular recess 2g of the tightening ring 2 has a notch 3 of the seal member 3.
The annular convex portion 3g located radially outward from c is fitted.

Effects of the Invention According to the above configuration, when the sealing member is inserted into the connecting pipe, the locking protrusion of the sealing member is located at the retracted position, so there is no problem with the insertion operation, and the sealing member is inserted into the connecting pipe. can be inserted smoothly. Further, since the locking protrusion fits into the recess of the connecting pipe and the locking surface of the locking protrusion comes into contact with the end surface perpendicular to the connecting pipe axis of the recess of the connecting pipe, the sealing member It is possible to more reliably restrict the movement of the connecting pipe in the axial direction. Also,
Since the inner edge of the connecting tube can be connected to the outer surface of the wedge portion at the locking position, the inner edge functions as a wedge for the sealing member, thereby further improving the sealing effect of the sealing member. . Furthermore, when the locking protrusion is pressed by the tightening ring and moved from the retracted position to the locking position, the locking protrusion locks onto the connecting pipe and restricts the axial movement of the connecting pipe. Therefore, the connection pipe can be effectively prevented from coming off. In addition, since the sealing member and the clamping ring that prevent the connecting pipe from coming off are constructed as separate members, the clamping ring is made of a rigid material, while the sealing member is made of a rigid material compared to the clamping ring. Can be formed from small materials. Therefore, the fastening ring with high rigidity can firmly maintain the connection with the joint body, while the seal member with low rigidity can effectively seal the joint body and the connecting pipe, and
The tightening ring can be easily rotated by hand.

[Brief explanation of drawings]

1 and 2 are a half sectional view and an enlarged sectional view of the main parts, respectively, showing a pipe joint according to an embodiment of the present invention;
4 is an enlarged cross-sectional view of the main part of the locking protrusion of the seal member at the retracted position and the locking position, respectively, and FIGS. 5 and 6 are cross-sectional views of a connecting pipe fitted with a seal ring in a conventional pipe joint, respectively. A half-sectional view of the above pipe joint,
7 and 8 are a half-sectional view and an enlarged sectional view of essential parts of another conventional pipe joint, respectively, and FIGS. 9 and 10 are a half-sectional view and an enlarged sectional view of a main part of a pipe joint according to another embodiment of the present invention, respectively. Enlarged sectional view of the main part of the sealing member of the joint, No. 11,
FIG. 12 is a half-sectional view of a pipe joint according to yet another embodiment of the present invention, and an enlarged sectional view of a main part of a sealing member of the pipe joint. 1...Joint body, 1a...Connecting cylinder part, 1b...
Male thread part, 1c...guiding surface, 1d...thick walled cylinder part,
2... Tightening ring, 2a... Tightening cylinder part, 2b... Female threaded part, 2c... Flange part, 2d... Inclined surface, 2e...
Through hole, 2f... annular projection, 2g... annular recess,
3... Seal member, 3a... Wedge part, 3b...
Locking protrusion, 3c... Notch, 3d... Flat end surface, 3
e... Inclined surface, 3f... Connection portion, 3g... Annular convex portion, 4... Connecting pipe, 4a... Concave portion, 5, 6... Between.

Claims (1)

[Claims] 1. A connecting cylinder portion 1 having a threaded portion 1b formed on its outer peripheral surface.
A joint main body 1 having a diameter of A tightening ring 2 having a flange 2c protruding toward the center of the direction; a sealing member 3 having a wedge portion 3a that is wedged between the inner circumferential surface of the connecting tube 1 and the outer circumferential surface of the connecting tube 4, and fitting the sealing member 3 to the connecting tube 4;
The seal member 3 and the connecting cylinder portion 1a of the joint body 1 are inserted into the tightening ring 2, and the female thread portion 2b of the tightening ring 2 and the male thread portion 1 of the joint body 1 are inserted.
b are screwed together, and the sealing member 3 is pressed against the joint body 1 side with the flange 2c of the tightening ring 2, so that the sealing member 3 is connected to the inner circumferential surface of the connecting cylinder of the joint body 1 and the connecting pipe 4. The pipe joint is configured to connect the connecting pipe 4 and the joint body 1 by biting into the outer circumferential surface of the joint body 1, and the sealing member 3 has the connecting pipe 4 at the other end.
A locking protrusion 3b is provided which is movable between a locking position B that locks into the recess 4a and restricts movement of the connecting pipe 4 in the axial direction and a retracted position A in which the lock is released. , the locking protrusion 3b has a locking surface 3g that can be locked by abutting against the end surface 4b perpendicular to the connecting tube axis of the recess 4a of the connecting tube 4 at the locking position B; At position B, the inner edge 1e of the connecting cylinder 1a can come into contact with the outer surface of the wedge portion 3a, while the tightening ring 2 presses the locking protrusion 3b during tightening, and A pipe joint characterized in that an inclined surface 2d for moving the portion 3b from the retracted position A to the locking position B is provided on the inner surface of the collar portion. 2 The sealing member 3 includes a thin connecting portion 3f between the wedge portion 3a and the locking protrusion 3b, and the locking protrusion 3b is connected to the wedge portion 3a by the connecting portion 3f. The pipe joint according to claim 1, which is movable freely between the retracted position A and the locking position B.