JP2000074273A - Drain pipe connecting packing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a one-touch packing having no trouble in which a pipe is pressed against a seal piece of the packing by large force when a connected pipe is largely deviated in relation to a socket, and the seal pipe is easily damaged, as the case may be, the seal piece is inward drawn and torn with pipe insertion in a conventional one-touch packing. SOLUTION: A plurality of centering deviation regulating projecting parts 13 to 13 for restraining centering deviation of a connecting pipe 2 in relation to a second seal piece 12 are circumferentially provided on the inner surface of a packing main body 11. Since the connecting pipe 2 is approximately concentrically maintained in relation to an inner peripheral hole of the seal piece 12, the seal piece 12 is bonded to the pipe 2 over the whole circumference by moderate force. Accordingly, the seal piece 12 is not partially drawn inward by large force in inserting of the pipe 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a packing used for connecting a drain pipe to a receptacle.

[0002]

2. Description of the Related Art Conventionally, as this type of packing, a one-touch type packing has been known as disclosed in, for example, Japanese Utility Model Publication No. 55-5833. This one-touch packing is used, for example, when the drainage stack 51 is inserted into and connected to the receptacle 52 of the drainage stack fitting as shown in FIG. 8, between the inner peripheral side of the receptacle 52 and the outer peripheral side of the drainage stack 51. The one-touch packing 50 allows the pipes to be connected in a reliable watertight state with a simple construction, so that the one-touch packing 50 is compared with the conventional mechanical joint. This greatly improved the workability of pipe connection.

[0003]

However, the conventional one-touch packing 50 has the following problems. That is, as shown in FIG. 9, the one-touch packing is formed of a rubber having appropriate elasticity in a cylindrical shape, and is formed into a cylindrical shape. It has an annular sealing piece 50b formed integrally with the peripheral surface and brought into close contact with the outer peripheral surface of the pipe 51 to be connected with an appropriate elastic force.
0a and the sealing piece 50b are formed concentrically.

The seal piece 50b is pressed against the outer peripheral surface of the pipe 51 to be connected in this manner with an appropriate elastic force, and the seal piece 50b formed relatively thin is fitted with the core of the inserted pipe 51. Since there is not enough rigidity to control the displacement, the pipe 51 may be largely misaligned with respect to the sealing piece 50b at the time of inserting the pipe or in the inserted state. Although a slight misalignment of the pipe 51 with respect to the seal piece 50b and the receiving port 52 is allowed, when the misalignment exceeds the allowable value, the pipe 51 is pressed against a part of the circumferential direction of the seal piece 50b with an unnecessarily large force. To be
The insertion force at the time of pipe connection is applied to the seal piece 50b as excessive frictional resistance (biting of the seal piece 50b). As a result of a large pipe insertion force being applied to a part of the sealing piece 50b,
There is a problem that a part of the seal piece 50b is drawn into the back side of the receptacle 52, and in some cases, a part of the seal piece 50b is torn. The present invention has been made in view of this problem, and has as its object to provide a drainage pipe connection packing capable of restricting a deviation of a pipe from a receptacle to a certain value or less.

[0005]

According to the present invention, there is provided a packing for drainage pipe connection according to the first aspect of the present invention, wherein a cylindrical main body is brought into close contact with the inner surface of the receptacle, and is provided so as to protrude from the inner peripheral surface of the main body. An annular sealing piece that is in close contact with the outer peripheral surface of the drain pipe connected to the receptacle, and on the inner peripheral surface of the main body, for regulating the misalignment of the drain pipe with respect to the inner peripheral hole of the sealing piece. And a plurality of center deviation regulating projections are provided along the circumferential direction. According to this packing for drainage pipe connection, by properly setting the protrusion size of each centering deviation regulating projection, the centering deviation of the drainage pipe with respect to the inner peripheral hole of the seal piece can be regulated to a certain value or less. In addition, unlike the related art, the drain pipe is not pressed against a part of the seal piece with an unnecessarily large force, thereby preventing breakage of the seal piece when the drain pipe is inserted.
In addition to the configuration in which the misalignment restricting convex portions are provided at equally-spaced positions in the circumferential direction, they may be provided at unequally-divided positions in the circumferential direction as necessary. The protrusion size of each center deviation regulating convex portion is such that the gap between the protrusion and the drain pipe inserted on the inner peripheral side of the seal piece is, for example, 1.5 mm on average.
It is desirable to set as follows. By setting the protruding dimension to such a degree, it is possible to position the inserted drain pipe substantially concentrically with respect to the inner peripheral hole of the seal piece without causing a large insertion resistance when inserting the drain pipe. Further, when the misalignment regulating protrusions are provided integrally with the packing, the hardness of only the misalignment regulating protrusions can be increased. According to this, the rigidity of the misalignment regulating protrusions increases, so that more reliable In addition, misalignment of the tube can be prevented. Further, by increasing the hardness of the center deviation regulating convex portion, the frictional resistance with the tube to be inserted can be reduced, thereby making it easier to connect the tubes.

The packing for drainage pipe connection according to claim 2 is
The packing according to claim 1, wherein the misalignment restricting convex portions are provided at equal positions in the circumferential direction. According to this packing for drainage pipe connection, misalignment can be prevented uniformly in all radial directions of the pipe. In particular, by providing the misalignment regulating protrusions at three equally circumferential positions, the misalignment of the drainage pipe can be regulated with the least number of misalignment regulating protrusions. In addition, if necessary, four or more misalignment regulating protrusions can be provided at equally spaced positions in the circumferential direction.

[0007]

FIG. 1 shows an embodiment of the present invention.
This will be described with reference to FIG. FIG. 1 shows a drainage pipe joint 1
5 shows an example in which the horizontal branch pipe 3 is connected to the drainage stack 2 by using a pipe. A drainage stack 2a on the upstream side is connected to the upper receptacle 1a of the drainage collecting pipe joint 1, and a horizontal branch pipe 3 is connected to a horizontal branch pipe receiving port 1b provided on the side of the drainage collecting pipe coupling 1. A toilet 4 is connected to the drain stack 2 via the horizontal branch pipe 3. In the figure, C is a concrete slab that partitions the upper floor and the lower floor, and the drainage pipe joint 1 is vertically penetrated through the concrete slab C and fixed.

The packing 10 of the first embodiment is used to connect the upper receiving port 1a of the drain collecting pipe joint 1 to the drainage stack 2a on the upstream side, and the connection between the receiving port 1b and the horizontal branch pipe 3 is connected by the first embodiment. The packing 20 of the second embodiment is used.
First, the packing 10 of the first embodiment is shown in FIGS. The packing 10 is made of rubber having a suitable elasticity and is formed in a substantially cylindrical shape.
The main body 11 has a cylindrical main body 11 that is in close contact with the inner peripheral surface of the main body 11, and a seal piece 12 provided integrally with the inner peripheral surface of the main body 11. A ridge 11a is formed on the outer periphery of the mouth of the main body 11 so as to fit into a groove 1c formed on the inner periphery of the mouth of the receptacle 1a. By fitting the ridge 11a into the groove 1c, the packing 10 is prevented from dropping out of the receiving port 1a, and is prevented from being pushed into the deep portion of the receiving port 1a when the upstream standing pipe 2a is inserted. In addition, a buffering portion 11b is formed on the insertion end of the main body 11 so as to protrude toward the inner peripheral side. The buffer portion 11b is substantially in contact with a stepped portion 1d provided at the back of the receptacle 1a as shown in the figure, and is sandwiched between the tip of the inserted upright tube 2a and the stepped portion 1d. The riser 2
It is possible to prevent the generation of abnormal noise due to the extension of “a”.

Next, as shown in FIG.
The main body 11 is formed so that the diameter gradually decreases from the vicinity of the inner periphery of the mouth toward the back. In the case of the present embodiment, the three seal pieces 12 to 12 are provided in substantially the same state. Each of the seal pieces 12 to 12 is formed concentrically with respect to the main body 11, and the inner peripheral hole of the seal piece 12 on the innermost side is the smallest. On the inner periphery of the mouth of the main body 11, there are provided misalignment regulating projections 13 to 13. In the case of the present embodiment, a total of three misalignment regulating projections 13 to 13 are provided at three equally spaced positions along the inner periphery of the mouth. The protruding dimension of each of the centering deviation regulating projections 13 to 13 is set to a dimension that allows a gap L of about 1.5 mm or less between the inserted outer peripheral surface of the upstream standing tube 2a and the same. The inserted standpipe 2a is provided with the three misalignment regulating protrusions 13-1.
By 3, the displacement in the radial direction is prevented, and the displacement of the core with respect to the seal pieces 12 to 12 is suppressed to a certain dimension or less.

According to the packing 10 of the first embodiment configured as described above, the seal pieces 12 to 12 of the connected standpipe 2a are formed.
The misalignment of the inner peripheral hole 12 with respect to the inner peripheral hole 12 is restricted to a certain size or less by the three misalignment regulating projections 13 to 13, so that there is no large misalignment as in the related art. For this reason, the standing pipe 2a is suppressed from being pressed against a part of the seal piece 12 in the circumferential direction with a large force, and each of the seal pieces 12 to 1 is suppressed.
2 is brought into close contact with the upright pipe 2a with an appropriate elastic force (pressing force). When the upright pipe 2a is inserted into the inner peripheral side of the packing 10, a part of the seal piece 12 in the circumferential direction has a large insertion resistance. This prevents the cable from being pulled to the far side and being torn off. In addition, the three misalignment regulating protrusions 13 to 13 suppress the misalignment of the connected standpipe 2a with respect to the inner peripheral holes of the seal pieces 12 to 12 to a certain dimension or less. When the 2a is extracted from the receiving port 1a, a part of the seal piece 12 in the circumferential direction is not damaged by the pipe extracting force.

Next, a packing 20 according to a second embodiment will be described. The second embodiment is an example in which the misalignment regulating protrusions 21 to 21 and 22 having the same function as the first embodiment are applied to the packing 20 for connecting the horizontal branch pipe.
As shown in FIG. 5, the packing 20 of the embodiment is interposed between the inner peripheral side of the side receiving port 1 b of the drainage joint 1 and the outer peripheral side of the horizontal branch pipe 3. This packing 20 is shown in FIG.
As shown in FIG. 7 alone, the packing 1 of the first embodiment
0, has a substantially cylindrical shape, and has a flange portion 20a to be brought into contact with the end face of the receiving port 1b, a cylindrical portion 20b for fixing to the inner peripheral side of the mouth of the receiving port 1b, and an inner peripheral surface of the receiving port 1b. And a seal piece 20d to be brought into close contact with the outer peripheral surface of the horizontal branch pipe 3. Both seal pieces 2
Oc and 20d are brought into close contact with the inner peripheral surface of the receiving port 1b and the outer peripheral surface of the horizontal branch pipe 3 with an appropriate elastic force, respectively.
High watertightness is secured between the receiving port 1b and the horizontal branch pipe 3. On the surface of the flange portion 20a, the flange portion 20a
A reinforcing metal fitting 20e for securing the rigidity of the device is attached. Further, the reinforcing fitting 20e provides a fire prevention measure for the apparent portion of the packing 20 (the portion exposed to the outside in the mounted state).

On the inner periphery of the cylindrical portion 20b, similarly to the packing 10 of the first embodiment, the misalignment regulating protrusions 21 to 21 are integrally formed. The misalignment restricting convex portions 21 to 21 and 22 of the packing 20 of the second embodiment have a total of 4 equal positions in the circumferential direction and positions corresponding to the center of the bottom of the horizontal branch pipe 3.
It is formed in several places. The self-weight of the horizontal branch pipe 3 is received by the misalignment regulating convex portion 22 located at the center of the bottom of the horizontal branch pipe 3. Further, the misalignment restricting convex portion 2 according to the second embodiment is provided.
Similarly to the first embodiment, the protrusion dimensions of Nos. 1 to 21 are set such that a gap of about 1.5 mm or less is formed between them and the horizontal branch pipe 3.

With the packing 20 of the second embodiment thus formed, the sealing piece 20d of the connected lateral branch pipe 3 is also provided.
The center misalignment with respect to the inner peripheral hole of the
Since it is restricted to a certain dimension or less by 1 to 21, there is no large misalignment as in the related art, and this allows the lateral branch pipe 3 to be pressed with a large force against a part of the seal piece 20 d in the circumferential direction. Is suppressed. For this reason, the sealing piece 21 is brought into close contact with the horizontal branch pipe 3 with an appropriate elastic force (pressing force) over the entire circumference thereof.
When the seal piece 20d is inserted on the inner peripheral side, a part of the seal piece 20d in the circumferential direction is prevented from being pulled to the far side by a large insertion resistance and torn off. In addition, the center misalignment regulating projections 21 to 21 suppress the misalignment of the connected horizontal branch pipe 3 with respect to the inner peripheral holes of the seal pieces 20d to 20d to a certain dimension or less. When the branch pipe 3 is extracted from the receiving port 1b, a part of the seal piece 20d in the circumferential direction is not damaged by the pipe extraction force.

The two embodiments described above can be further modified. For example, the center deviation regulating projections 13-1
3, 21 to 21 are provided at three equally spaced positions in the circumferential direction. However, a total of four or more four equally divided positions may be provided at equally spaced positions in the circumferential direction. It is good also as a structure provided in a circumferential unequal position as needed. Further, in order to receive the weight of the lateral branch pipe 3 more reliably, the central deviation regulating convex part 22 that receives the center of the bottom of the lateral branch pipe 3 has a larger volume than the other three central deviation regulating convex parts 21 to 21. May be formed large.

In the first or second embodiment,
Alignment regulating protrusions 13 to 13 or alignment deviation regulating protrusion 21
By setting the hardness of only the first to second 21 to 22 higher than that of the packing body side, each of the misalignment regulating protrusions 13 to 13, 21 to 2
The rigidity of the pipes 1 and 22 can be increased, whereby the misalignment of the connected pipes (the standing pipe 2a and the horizontal branch pipe 3) can be regulated more reliably. In addition, the center deviation regulating projection 13-
By increasing the hardness of the pipes 13, 21 to 21 and 22, the frictional resistance with the pipes to be connected (standing pipe 2a, horizontal branch pipe 3) can be reduced. Insertion work) can be further facilitated. Furthermore, the configuration has been exemplified in which the misalignment regulating protrusions 13 to 13, 21 to 21 and 22 are integrally provided on the packing body side (the body 11 and the cylindrical portion 20b). May be arranged at a predetermined position. Therefore, the properties such as the material, hardness, etc. of the core deviation regulating projections 13 to 13, 21 to 21 and 22 can be arbitrarily set separately from the packing main body side (the main body portion 11 and the cylindrical portion 20b).

[Brief description of the drawings]

FIG. 1 is a side view showing an example of piping construction using a drainage pipe joint.

FIG. 2 is a longitudinal sectional view of a portion (2) in FIG.

FIG. 3 is a plan view of the packing body of the first embodiment.

FIG. 4 is a sectional view taken along line (4)-(4) of FIG. 3 and a longitudinal sectional view of the packing of the first embodiment.

FIG. 5 is a vertical sectional view of a portion (5) in FIG. 1;

FIG. 6 is a plan view of a packing unit according to a second embodiment.

FIG. 7 is a sectional view taken along line (7)-(7) of FIG. 6, and is a longitudinal sectional view of the packing of the second embodiment.

FIG. 8 is a longitudinal sectional view of a standpipe connecting portion using a conventional packing.

FIG. 9 is a longitudinal sectional view of a conventional packing.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Drainage collecting pipe joint 1a ... Upper receiving port, 1b ... Horizontal branch pipe receiving port 2 ... Drainage standing pipe, 2a ... Upstream standing pipe 3 ... Horizontal branch pipe C ... Concrete slab 10 ... Packing (1st Embodiment) 11 ... Main body part, 11a ... Protrusion, 11b ... Buffer part 12 ... Seal piece 13 ... Alignment deviation restricting convex part 20 ... Packing (second embodiment) 21, 22 ... Alignment deviation restricting convex part

Claims (2)

[Claims] 1. A cylindrical main body which is brought into close contact with an inner surface of a receiving port, and an annular seal piece which is provided so as to protrude from an inner peripheral surface of the main body and is brought into close contact with an outer peripheral surface of a drain pipe connected to the receiving port. A drain having a configuration in which a plurality of misalignment regulating protrusions for regulating misalignment of the drainage pipe with respect to the inner circumferential hole of the seal piece are provided on the inner peripheral surface of the main body along the circumferential direction. Packing for pipe connection. 2. The packing for drainage connection according to claim 1, wherein the misalignment restricting convex portions are provided at equal positions in a circumferential direction.