JP6521357B2 - Branch fitting - Google Patents

Description

  The present invention relates to a branch joint that connects a main pipe and an auxiliary pipe.

  When connecting the main pipe and the sub pipe, a branch joint is generally used. For example, a branch joint has a hole formed in a main pipe, a branch joint is attached to the hole, and a secondary pipe for draining water to the main pipe or a secondary pipe for draining water from the main pipe through the branch joint. Connect the tube.

  For example, Patent Document 1 discloses that a hole is formed in a main pipe using a tool such as a hole saw, and a branch joint is fixed to the hole to connect an auxiliary pipe. Further, in Patent Document 2, a hole is formed in the main pipe (connected pipe) to connect the branch joint with a hole saw or the like, the branch joint is inserted into the hole from the outside of the main pipe, and the nut body is There is a disclosure that the branch joint is fixed to the main pipe by tightening and screwing from the outside. Further, in Patent Document 3, a hole is bored by drilling a wall of a main pipe (tube body), a branch joint is inserted from the outside of the main pipe, and a nut is tightened from the inside of the main pipe to branch the joint Has been disclosed to fix the main pipe.

Japanese Patent Application Publication No. 06-207697 JP 2002-228076 A JP 2012-82876 A

  The holes in the main pipe are generally drilled using a tool such as a hole saw to attach the branch joint. There is a problem that the dimension of the opening varies depending on the level of skill of the worker who performs the drilling operation and the performance of the tool such as a hole saw. If the hole is not drilled with high dimensional accuracy, the stability and water blocking properties of the branch joint will deteriorate. In particular, when a large amount of water flows in the branch joint or the pressure applied to the fluid is high, high centering accuracy to the opening is required. For this reason, it is desirable for the branch joint to ensure water-repellency and fixability even when the dimensions of the opening vary.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a branch joint which can ensure high centering accuracy and water stop and fixability.

  In order to solve the above-mentioned problems, the branch joint according to the present invention is a branch joint attached to an opening bored in a main pipe and connecting a sub pipe to form a branch passage, from the outside of the opening of the main pipe A branch joint main body including a cylindrical portion to be inserted, a collar portion provided on the outer periphery of the cylindrical portion, and a guide portion guiding the cylindrical portion in the opening to connect the sub-pipe, and the branch joint main body A tubular member having a fixing member screwed from the inside of the main pipe, and an inclined part abutting from the inside of the main pipe at the edge of the opening, and the inclined member positioned between the fixing member and the main pipe And the main pipe is held between the flange portion of the branch joint main body and the inclined member.

  According to the present invention, the branch joint can be attached with high accuracy to the hole formed in the main pipe.

It is a conceptual diagram of a latent heat recovery type gas water heater which applies a branching joint by this embodiment. FIG. 2 shows a cross-sectional view of the branch joint of the first embodiment of the present invention, FIG. 2 (A) shows a state attached to a main pipe, and FIG. 2 (B) shows a disassembled state. It is a perspective view of the cylindrical member of a branch coupling. It is a perspective view of a guide member. It is a perspective view of the state which combined the packing with the wedge member of a branch coupling. It is a perspective view of the inclination member of a branch coupling. It is a perspective view of the fixing member of a branch coupling. FIG. 8A is a process diagram showing a procedure for attaching a branch joint to a main pipe, FIG. 8A shows a state in which a hole is formed in the main pipe by a hole saw, and FIG. 8B shows a state of the main pipe provided with a hole; FIG. 8 (C) shows the cylindrical part engaged with the guide part inserted into the opening of the main pipe through the wedge member, and FIG. 8 (D) is the attachment of the fixed member and the branch joint attached The situation is shown, and FIG. 8 (E) shows the situation where the sub pipe is further attached. FIG. 9 (A) shows a cross-sectional view of a branch joint and FIG. 9 (B) is an explanatory view of a case (first application example) in which a branch joint is attached to a hole of 35 mm in diameter provided in a main pipe having an outer diameter of 165 mm. It is a projection view of a hole. FIG. 10 is an explanatory view of a case (second application example) in which a branch joint is attached to a hole of 38 mm in diameter provided in a main pipe having an outer diameter of 165 mm, FIG. 10 (A) shows a cross-sectional view of the branch joint, and FIG. It is a projection view of a hole. FIG. 11 (A) is a cross-sectional view of a branch joint, and FIG. 11 (B) is an explanatory view of a case (third application example) in which a branch joint is attached to a hole of 40 mm in diameter provided in a main pipe having an outer diameter of 165 mm. It is a projection view of a hole. FIG. 12 (A) shows a cross-sectional view of a branch joint, and FIG. 12 (B) is an explanatory view of a case (a fourth application example) in which a branch joint is attached to a hole of 35 mm in diameter provided in a main pipe having an outer diameter of 216 mm. It is a projection view of a hole. FIG. 13 (A) is a cross-sectional view of a branch joint, and FIG. 13 (B) is an explanatory view of a case (a fifth application example) in which a branch joint is attached to an aperture of 38 mm in diameter provided in a main pipe having an outer diameter of 216 mm. It is a projection view of a hole. FIG. 14 is an explanatory view of a case (a sixth application example) in which a branch joint is attached to a hole of 40 mm in diameter provided in a main pipe having an outer diameter of 216 mm, FIG. It is a projection view of a hole. It is sectional drawing which adapts the wedge member from which a curvature radius differs with respect to the main pipe which has a predetermined | prescribed outer diameter, and FIG.15 (A)-(C) show the case where the wedge member from which a curvature radius differs, respectively is applied. It is a conceptual diagram explaining the combination of multiple types of guide members and multiple types of inclination members, and FIGS. 16 (A) to (D) are combinations of patterns 1 to 4, respectively. 17A shows a cross-sectional view of a branch joint according to a second embodiment of the present invention, FIG. 17A shows a state attached to a main pipe, FIG. 17B shows a disassembled state, and FIG. It is an enlarged view of field C of 17 (A).

<< First Embodiment >>
A first embodiment of an example of the embodiment (hereinafter, the present embodiment) to which the present invention is applied will be described in detail with reference to the drawings. The technical scope of the present invention is not limited to this embodiment. The present embodiment can be variously modified without departing from the scope of the present invention.

FIG. 1 is a conceptual diagram of the branch joint 30 of the first embodiment applied to a latent heat recovery type gas water heater 1. The latent heat recovery type gas water heater 1 shown in FIG. 1 is a water heater whose hot water supply heat efficiency is improved by recovering the latent heat of the combustion gas. The latent heat recovery type gas water heater 1 can improve the hot water supply heat efficiency in the conventional water heater from about 80% to about 95%. As a result, energy saving can be achieved, significant running cost reduction can be achieved, and carbon dioxide (CO ₂ ) emissions can be reduced by about 13% compared to conventional types, thereby reducing global environmental load and operating costs.

Inside the water heater main body 2 of the latent heat recovery type gas water heater 1, there is provided a water supply pipe 3 for introducing water to the heat exchange path 4 and heat exchange for heating water introduced from the water supply pipe 3 by the heat exchanger 6. A pipe 4 and a hot water supply pipe 5 for supplying hot water heated by the heat exchange path 4 to equipment such as a bath are piped.
The heat exchanger 6 also includes a primary heat exchange unit 11 and a secondary heat exchange unit 12. Hot and cold water supplied from the water supply pipe 3 and flowing through the heat exchange path 4 passes through the secondary heat exchange section 12 and is then introduced into the hot water supply pipe 5 through the primary heat exchange section 11.

  The heat exchanger 6 includes a fuel supply pipe 7 for supplying a gas which is a fuel, a combustion unit 8 for burning the fuel, and a heat exchanger 9 for heating the heat exchange passage 4 with the heat generated in the combustion unit 8. The heat exchanger 9 is composed of a blower 10 that sends heat to the heat exchanger 9. The heat generated in the combustion unit 8 heats the water of the heat exchange passage 4 in the primary heat exchange unit 11 of the heat exchanger 6 by the air blowing from the air blowing unit 10. Further, the residual heat of the primary heat exchange unit 11 heats water having a low temperature which is led from the water supply pipe 3 in the secondary heat exchange unit 12 of the heat exchanger 6. As described above, the latent heat recovery type gas water heater 1 efficiently uses the heat generated by the combustion unit 8.

  The heat exchanger 6 of the latent heat recovery type gas water heater 1 performs heat exchange which lowers the temperature of the combustion gas instead of raising the temperature of the water of the heat exchange passage 4 by the heat generated in the combustion unit 8. When the temperature of the combustion gas is lowered by this heat exchange, the combustion gas generates a drain 16 which is condensed water. In the latent heat recovery type gas water heater 1, the drain 16 is recovered by the drain recovery unit 17.

  In the drain 16, an acidic component such as nitrogen oxide (NOX) contained in a small amount in the combustion gas is dissolved. In addition, the temperature of the drain at the time of discharge is about 50 degreeC. The drain 16 in which the acidic component dissolves into the combustion gas exhibits, for example, an acidity of about pH 3. That is, the drain 16 exhibits strong acidity. Therefore, the drain 16 can not be discharged to the outside at the same pH value. Therefore, the latent heat recovery type gas water heater 1 is provided with a neutralizer 19 in the middle of the drain discharge pipeline 18 connected to the downstream of the drain recovery unit 17.

The neutralizer 19 neutralizes the pH value of the drain 16 to about pH 7 or so. The neutralization by the neutralizer 19 is due to the function of the neutralizer charged in the neutralizer 19. As a neutralizing agent, for example, calcium carbonate (CaCO ₃ ) used in general neutralization treatment can be used. The neutralizer 19 neutralizes the acidic drain 16 by the action of the neutralizing agent.

  The amount of generation of the drain 16 is proportional to the amount of combustion gas. For this reason, as for the filling amount of the neutralizing agent, the amount necessary for treating drain drainage generated during the standard use period of the latent heat recovery type gas water heater 1 is calculated in advance, and the necessary amount is neutralized. Installed on 19 The latent heat recovery type gas water heater 1 discharges the drain 16 from the drain discharge pipe 18 to the drainage branch pipe 20 outside the water heater main body 2 after the neutralization processing by the neutralizer 19.

In addition, the drain discharge pipeline 18 and the drainage branch pipe 20 which protrude from the water heater main body 2 are not directly connected. A gap opened to the atmosphere is provided between the drain discharge pipe 18 and the drainage branch pipe 20 to make indirect drainage. Then, the drain receiver 21 provided at the upper end of the drainage branch pipe 20 receives the drain 16 flowing from the drainage discharge pipe 18 and flows the drainage 16 to the drainage branch pipe 20. The drainage branch pipe 20 is connected, for example, to a sewage mass 22 buried in the ground via a branch joint 30.
The sewage mass 22 connecting the branch joint 30 is subject to temperature change due to drain (fluid), vibration due to the installation location, and temperature change. The waste water mass 22 is, for example, buried in the ground and installed. The waste water mass 22 includes a lid 23 that can be opened and closed from the top. Then, the drain 16 flows to the downstream pipe 24 connected to the waste water mass 22.

  In addition, the reason for using indirect piping is that if the sewage flow back from the sewage mass 22 due to clogging of the drainage branch pipes 20 and the drainage pipes such as the sewage mass 22 and the downstream pipe 24, the sewage to the latent heat recovery type gas water heater 1 This is to prevent infiltration. Although the drainage branch pipe 20 of FIG. 1 is not provided with a sealing water mechanism for preventing the offensive odor diffusion, the drainage branch pipe 20 can be provided with a sealing water mechanism according to the installation place for indirect piping.

  FIG. 2A is an enlarged cross-sectional view of the branch joint 30 connecting the drainage branch pipe 20 (hereinafter, the sub pipe 20) and the dirty water mass 22 (hereinafter, the main pipe 22) illustrated in FIG. Further, FIG. 2 (B) shows a disassembled state of the branch joint 30. As shown in FIGS. 2A and 2B, the main pipe 22 is provided with an opening 25 and the branch joint 30 is attached to the opening. Furthermore, the branch pipe 30 is attached to this branch joint 30, and the piping structure branched by this is comprised.

The branch joint 30 includes a branch joint main body 31 (hereinafter, main body 31), an inclination member 71, and a fixing member 41.
The main body 31 has a tubular member 32 provided with a cylindrical tubular portion 36, a wedge member 52 provided with a wedge portion 52a, and a guide member 61 provided with a guide portion 61a. The guide member 61 forms a through hole 64, and the cylindrical portion 36 of the cylindrical member 32 is inserted through the through hole 64. Similarly, the wedge member 52 forms a hole 54, and the guide portion 61 a of the guide member 61 is inserted into the hole 54.

  The cylindrical member 32 has a flange portion 33 in the outer cylindrical portion 32 b on the side connected to the sub pipe 20. Further, the cylindrical member 32 has a cylindrical portion 36 in the insertion cylindrical portion 32 a on the side to be inserted into the opening 25 of the main pipe 22. A packing 58 (water blocking member) is sandwiched between the flange portion 33 of the cylindrical member 32 and the guide member 61. Further, the guide member 61 has a flange portion 62. The packing 57 is sandwiched between the flange portion 62 of the guide member 61 and the wedge member 52. As described above, in the example shown in FIGS. 2A and 2B, the packing 58 is interposed between the cylindrical member 32 and the guide member 61, and the packing 57 is interposed between the guide member 61 and the wedge member 52. In this example, the packing 56 is interposed between the wedge member 52 and the main pipe 22. By providing the packings 58, 57, 56, the cylindrical member 32 can improve the airtightness of each part and prevent water leakage. However, in the case where the tubular member 32 is formed of, for example, a synthetic resin of a material having a hardness lower than that of the main pipe 22 and the tubular member 32 and having high deformability and the deformation can be secured. In addition, any or all of the packings 58, 57, 56 may not be used.

  The main body 31 inserts the tubular portion 36 into the opening 25 of the main pipe 22 with the packing 58, the guide member 61, the packing 57, the wedge member 52, and the packing 56 attached to the cylindrical member 32. Furthermore, the fixing member 41 to which the inclined member 71 is attached is screwed to the cylindrical portion 36 that protrudes to the inner diameter side (inner side) of the main pipe 22. Thus, the tubular member 32 and the fixing member 41 sandwich the tube wall of the main pipe 22 by arranging the packing 58, the guide member 61, the packing 57, the wedge member 52, the packing 56, and the inclined member 71 therebetween. Thus, the branch joint 30 is attached to the opening 25 of the main pipe 22.

  The through hole 34 forming the inner diameter of the cylindrical portion 36 of the cylindrical member 32 is provided with a step portion 35 which narrows the inner diameter of the cylindrical portion 36 radially inward from the wall side of the through hole 34 to form a step. The stepped portion 35 functions as positioning of the auxiliary pipe 20 when the auxiliary pipe 20 is inserted into the cylindrical member 32 from the flange portion 33 side. The stepped portion 35 is formed to have an inner diameter that does not prevent the flow of the drain 16 when the sub-tube 20 is inserted into and connected to the cylindrical portion 36. The stepped portion 35 is formed, for example, at an intermediate portion in the longitudinal direction of the cylindrical portion 36.

<Tubular member>
FIG. 3 is a perspective view of the cylindrical member 32. FIG. The cylindrical member 32 includes a cylindrical cylindrical portion 36 formed in the insertion cylindrical portion 32 a inserted into the opening 25 of the main pipe 22 and a flange portion 33 formed in the outer cylindrical portion 32 b on the side connected to the pipe 20. Have. The cylindrical portion 36 has a locking portion 37 (male thread) on the outer peripheral surface. The fixing member 41 and the guide member 61 are engaged with the locking portion 37. The locking portion 37 is formed on the outer periphery of the cylindrical portion 36 in a screw shape projecting outward in the radial direction of the cylindrical portion 36. The fixing member 41 engages with the locking portion 37 from the inside of the main pipe 22 to fix the branch joint 30 to the opening 25.

  When the tubular portion 36 is inserted into the hole 25 of the main pipe 22, the locking portion 37 is formed to have a dimension necessary for screwing with the fixing member 41. That is, the length in the longitudinal direction of the locking portion 37 is about the same as the total thickness of the tube thickness of the main tube 22, the thickness of the flange portion 62 of the guide member 61, and the wedge member 52, the inclined member 71 and the fixing member 41. Form longer than.

The flange portion 33 protrudes outward in the circumferential direction more than the cylindrical portion 36. On the outer peripheral surface of the flange portion 33, a rotation applying portion 33b used when the tubular member 32 and the fixing member 41 are engaged is formed. The rotation applying portion 33b is formed of a plurality of surfaces formed along the circumferential direction, and is formed in, for example, a hexagonal nut shape. The operator can tighten the rotation applying portion 33b using a tool such as a spanner or a wrench. In addition, when forming the rotation provision part 33b cylindrically, it can clamp using a bell trench.
A flange surface 33 a is formed on the surface of the flange portion 33 on the cylindrical portion 36 side. The flange surface 33a is formed, for example, in a plane. The flange surface 33 a is in contact with a surface 62 a which is an end surface of a guide member 61 described later.

<Guide member>
FIG. 4 is a perspective view of the guide member 61. As shown in FIG. The guide member 61 engages with the locking portion 37 of the cylindrical member 32. The guide member 61 also serves to guide the cylindrical portion 36 of the cylindrical member 32 through the opening 25 of the main pipe 22. The guide member 61 is a cylindrical body having a through hole 64 in the longitudinal direction. In the through hole 64 of the guide member 61, an engaging portion 66 (female screw) that engages with the locking portion 37 of the cylindrical member 32 is formed. The engagement portion 66 is formed in a screw shape projecting radially inward of the through hole 64.

A guide portion 61 a and a flange portion 62 are formed on the outer periphery of the guide member 61.
The guide portion 61a has the same diameter portion 68 formed shorter than the thickness of the tube wall of the main pipe 22, and a tapered portion 69 reduced in diameter along the axial direction. The flange portion 62 is located on the same diameter portion 68 side of the guide portion 61a.

  The same diameter portion 68 of the guide portion 61 a is formed with the same outer diameter from the flange portion 62 to, for example, approximately the center of the guide member 61 in the longitudinal direction. The tapered portion 69 is formed so as to gradually reduce in diameter from the same diameter portion 68 toward the end of the guide member 61. In addition, the shape of the taper part 69 is not limited to the above-mentioned shape. The tapered portion 69 may be formed of, for example, a plurality of surfaces continuing from the same diameter portion 68. The same diameter portion 68 has, for example, an outer periphery formed in a cylindrical shape with the same diameter. However, the shape of the same diameter portion 68 may be other than that. For example, the same diameter portion 68 may be formed by a plurality of surfaces formed along the circumferential direction of the guide member 61.

The flange portion 62 is formed so as to protrude outward in the radial direction of the guide member 61, and a planar engagement surface 62a facing the flange portion 33 of the cylindrical member 32 described above and a planar engagement member pressing the wedge member 52 described later. And a stop face 62b. Between the flange portion 33 and the flange portion 62, a packing 58 (see FIGS. 2A and 2B) is provided to improve waterproofness as needed.
When the flange portion 62 is formed in a hexagonal nut shape including a plurality of surfaces along the circumferential direction, the operator can screw the guide member 61 to the cylindrical member 32 using a tool such as a spanner or a wrench.

The same diameter portion 68 of the guide portion 61 a of the first embodiment is formed to have a dimension shorter than the thickness 5.1 mm of the tube wall of the main tube 22. The dimension of the same diameter portion 68 in the first embodiment is 4.0 mm. The tapered portion 69 reduces the diameter of the same diameter portion 68 toward the end side with a wide dimension. The tapered portion 69 in the first embodiment is formed with an inclination of about 26 degrees (inclination of 2.15 / 4.24). The tapered portion 69 smoothly guides the tubular member 32 into the opening 25 by the inclination thereof.
The inclination of the tapered portion 69 secures a gap in which the guide portion 61a does not abut on the spherical portion 72 (inclined portion) of the inclined member 71 described later in a state where the branch joint 30 is fixed to the main pipe 22. The inclination of the taper portion 69 may be any other method as long as it can secure a gap in which the guide portion 61a and the spherical surface portion 72 of the inclination member 71 do not abut. For example, the inclination of the taper portion 69 may be about 20 degrees to about 30 degrees.

<Wedge member>
As shown in FIG. 5, the wedge member 52 is formed of a member different from the cylindrical member 32. The wedge member 52 includes a wedge portion 52a and forms a hole 54 through which the tubular member 32 and the guide member 61 are inserted.
The flange portion 52 a is formed in a shape that covers the opening 25 and abuts on the outer diameter of the main pipe 22. The outer shape of the collar 52a is rectangular. A packing 56 (waterproof packing) may be provided on the lower surface 52b of the wedge member 52 on the side in contact with the main pipe 22 to improve the waterproofness by the contact with the main pipe 22. A display 53 as shown in the drawing may be provided on the upper surface 52c opposite to the lower surface 52b of the flange 52a to display the range of the outer diameter of the main pipe to which the flange 52a can be applied to the operator.

  At the center of the wedge member 52, a hole 54 through which the cylindrical portion 36 of the cylindrical member 32 can be inserted is formed. Further, a flat portion 55 is formed around the hole 54 so as to protrude toward the upper surface 52 c of the flange portion 52 a and to face the locking surface 62 b of the flange portion 62 of the guide member 61. The flat portion 55 has a flat surface corresponding to the locking surface 62 b of the flange portion 62. The dimension of the flat portion 55 is formed, for example, to an outer diameter substantially the same as the outer diameter of the locking surface 62 b.

  The locking surface 62 b of the guide member 61 and the flat portion 55 have flat shapes corresponding to each other. Therefore, the flat portion 55 of the wedge member 52 can be in surface contact with the locking surface 62 b of the cylindrical member 32. In addition, between the locking surface 62b of the guide member 61 and the flat portion 55 of the wedge member 52, a packing 57 (see FIGS. 2A and 2B) is provided to improve waterproofness as necessary. When the packing 57 is provided, the flat portion 55 and the locking surface 62 b face each other via the packing 57 and sandwich the packing 57.

  The wedge member 52 is disposed between the locking surface 62 b of the guide member 61 and the main pipe 22 and covers the periphery of the opening 25 at the wedge portion 52 a. The flange portion 52 a is formed to be curved at a constant curvature so as to be substantially along the circumferential direction of the outer diameter of the main pipe 22. The curvature of the flange portion 52 a is preferably set to a gentle radius of curvature that is more moderate than the outer diameter of the main pipe 22 from the curvature substantially the same as the outer diameter of the main pipe 22. The specific shape of the flange portion 52 a is a gentle radius of curvature that is smaller than the curvature of the outer diameter of the main pipe 22, and is formed in a shape substantially along the circumferential direction of the outer diameter of the main pipe 22.

  The packing 56 of the first embodiment has a thickness of about 5 mm. The packing 56 is attached to the lower surface 52b of the flange 52a in contact with the outer periphery of the main pipe 22 using an adhesive. As the adhesive, for example, rubber-based adhesives, epoxy-based adhesives, cyanoacrylic-based adhesives, vinyl-based adhesives, silicone rubber-based adhesives, plastic-based adhesives, hot bonds, hot melts, adhesive tapes, etc. Use.

<Inclination member>
As shown in FIG. 6, the inclined member 71 has a spherical portion 72 (inclined portion) in contact with the inner periphery of the main pipe 22 and a projection 75 accommodated in a groove 45 of a fixing member 41 described later. Further, the inclined member 71 has a through hole 74 penetrating in the axial direction.

The through hole 74 is formed to have a diameter that can accommodate the tapered portion 69 of the guide portion 61 a of the guide member 61.
The spherical portion 72 has a tip portion 72a smaller in diameter than the outer diameter (the same diameter portion 68) of the guide portion 61a, and a root portion 72b of the spherical portion 72 larger in diameter than the opening 25. To form. The bottom surface 73 of the root portion 72b abuts on a fixing member 41 described later. From the bottom surface 73 (see FIG. 2B) that abuts on the fixing member 41, the protrusion 75 protrudes in a circumferential shape surrounding the through hole 74. The protrusion 75 fits in a groove 45 described later formed in the fixing member 41.

  The outer diameter (the same diameter portion 68) of the guide portion 61a of the first embodiment is 34.5 mm. The tip end portion 72a (tip end side) of the spherical portion 72 in the first embodiment is formed to have a diameter of 33.4 mm, and the diameter of the root portion 72b (other end side) of the spherical portion 72 is formed to be 49.5 mm. Then, the spherical surface portion 72 forms a spherical surface connecting the tip end portion 72a and the root portion 72b with a curve.

The spherical surface portion 72 of the first embodiment is formed to be a spherical surface with a curvature R30 mm which is steeper than the inner diameter of the main pipe 22. Then, the tip end portion 72a of the spherical portion 72 is formed in a shape that does not abut on the guide portion 61a. Specifically, as shown in the cross sections of FIGS. 2A and 2B, the specific shape of the distal end portion 72a is such that the distal end of a spherical surface of R30 mm is cut off with a smaller diameter than the outer diameter of the guide portion 61a.
In the present embodiment, a spherical portion 72 having a spherical shape is provided as the inclined portion. However, the present invention is not limited to the configuration having the spherical shape, and if the tip end portion 72a is smaller than the diameter of the aperture 25 and the root portion 72b is larger than the diameter of the aperture 25, a conical inclined surface may be provided.

<Fixing member>
As shown in FIG. 7, the fixing member 41 is a nut-like member having a groove 45 accommodating the projection 75 of the inclined member 71 and a rotation applying portion 43. The fixing member 41 has a through hole 44 through which the cylindrical portion 36 of the cylindrical member 32 is inserted. In the through hole 44, an engaging portion 46 (female screw) engaged with the locking portion 37 of the cylindrical portion 36 is formed in a screw shape which protrudes inward in the radial direction of the through hole 44.

  The groove 45 accommodates the protrusion 75 of the inclined member 71. The groove 45 and the protrusion 75 may be fitted or loosely fitted. When the groove 45 and the protrusion 75 are fitted, workability is good when the fixing member 41 and the cylindrical member 32 are engaged.

The rotation applying portion 43 has a plurality of concave portions 43 a and convex portions 43 b alternately arranged along the circumferential direction of the fixing member 41. The operator grips the rotation applying portion 43, rotates the fixing member 41, engages the engaging portion 46 of the fixing member 41 with the locking portion 37 of the cylindrical portion 36, and tightens.
Specifically, the rotation applying portion 43 has six concave portions 43 a and six convex portions 43 b alternately. By the plurality of concave portions 43a and the convex portions 43b of the rotation applying portion 43, the operator can hold the fixing member 41 firmly and easily perform the tightening operation.
The shape of the rotation applying portion 43 is not limited to the above-described shape. For example, the rotation applying portion 43 may be formed in a hexagonal nut shape, and the rotation applying portion 43 may be tightened using a tool such as a spanner or a wrench. By tightening the rotation applying portion 43 using a tool, the operator can tighten the fixing member 41 more firmly, and the branch joint 30 can be securely attached to the main pipe 22.
Further, each of the plurality of recessed portions 43a of the rotation applying portion 43 has a cutout shape that is recessed inward in the radial direction. The plurality of concave portions 43 a are formed in such a manner that a part of the bottom surface 73 of the inclined member 71 is recessed to a visible size in a state where the projection 75 of the inclined member 71 is accommodated in the groove 45 of the fixing member 41. In other words, the operator can visually recognize the state of the root portion 72b of the spherical portion 72 which is formed to have a diameter larger than that of the opening 25 by the concave portion 43a.

As described above, the branch joint 30 includes the tubular member 32, the wedge member 52, the guide member 61, the inclined member 71, and the fixing member 41.
The cylindrical member 32 engaged with the guide member 61 inserts the insertion cylindrical portion 32 a into the hole 25 from the outside of the main pipe 22, and engages with the fixing member 41 inside the main pipe 22 via the inclined member 71. The branch joint 30 is fixed to the hole 25 of the main pipe 22 so as to sandwich the pipe wall of the main pipe 22 from the inside and outside.

The cylindrical member 32, the wedge member 52, the guide member 61, the inclined member 71, and the fixing member 41 which constitute the branch joint 30 are formed of, for example, a synthetic resin such as a vinyl chloride resin. In the vinyl chloride resin, various additives such as a plasticizer, a stabilizer, a filler, a UV absorber, an antioxidant, a processing aid and the like are appropriately blended with the vinyl chloride resin.
In addition to these vinyl chloride resins, synthetic resins copolymerize other monomers and oligomers with vinyl chloride monomers such as ethylene-vinyl chloride copolymer resin, vinyl acetate-vinyl chloride copolymer resin, urethane-vinyl chloride copolymer resin, etc. What may be blended with other synthetic resins or synthetic rubbers such as polyethylene resin, polypropylene resin, ethylene-vinyl acetate copolymer resin, acrylic resin, urethane resin, polyester resin, nitrile rubber, acrylic rubber and the like may be used. Also, similarly to vinyl chloride resins, plasticizers, stabilizers, lubricants, fillers, UV absorbers, and various other additives can be added to synthetic resins other than vinyl chloride resins as appropriate. is there. The material of the branch joint 30 is not limited to synthetic resin. For example, the material of the cylindrical member 32, the wedge member 52, the guide member 61, the inclination member 71, and the fixing member 41 which constitute the branch joint 30 may be metal.

The material of the fixing member 41 may be soft polyvinyl chloride. Soft polyvinyl chloride has low hardness and is highly deformable. That is, the fixing member 41 formed of soft polyvinyl chloride has a large amount of deformation when the engaging portion 46 engages with the locking portion 37 of the cylindrical member 32, and the water tightness of the screwing portion can be secured. The engagement force can be improved and it is difficult to loosen.
In the branch joint 30, each of the tubular member 32, the guide member 61, the wedge member 52, the inclined member 71, and the fixing member 41 may be formed of the same material. More specifically, all of them including the main pipe 22 may be made of vinyl chloride. If the cylindrical member 32, the wedge member 52, the guide member 61, the inclined member 71, and the fixing member 41 are made of the same material, their thermal expansion coefficients become substantially the same, and the screwing portion resulting from thermal expansion or thermal contraction The slack can be suppressed.

  Further, the packing 58, the packing 57 and the packing 56 are formed of an elastic rubber or the like such as a low resilience material or a water expansion and water stopping material. The material of the packing 58, the packing 57 and the packing 56 is, for example, polyurethane, hard urethane, nitrile rubber, hydrogenated nitrile rubber, various fluorine rubbers, EPDM, silicone rubber, perfluoro elastomer, Teflon (registered trademark), fluorine resin, PEEK, PA, POM, UHMW-PE, etc. are used.

Next, a procedure for attaching the branch joint 30 to the hole 25 of the main pipe 22 will be described with reference to FIGS. 8 (A) to 8 (E).
The main pipe 22 of the first embodiment has an outer diameter of 165 mm, a wall thickness of 5.1 mm, and an inner diameter of 154 mm as an approximate inner diameter. The JIS standard dimension of the thickness of the tube wall is 5.1 (+0.8 to -0), and the inner diameter is a reference value.

  First, as shown in FIG. 8A, the hole 25 is bored in the main pipe 22 using the hole saw 51. The size of the hole 25 varies depending on the level of skill of the worker who performs the drilling operation and on the performance of the hole saw 51. In the case where the hole saw 51 has a dimension of 35 mm and the hole 25 is drilled, the actual diameter of the hole 25 in FIG. 8B is, for example, about 35 mm to 40 mm.

Next, as shown in FIG. 8C, the opening 25 of the main pipe 22 is covered with the wedge member 52 through the packing 56, and the hole 54 of the wedge member 52 (see FIGS. 2 and 5) and the main pipe 22 The centers of the openings 25 are substantially aligned. Furthermore, the cylindrical portion 36 of the cylindrical member 32 in which the guide member 61 is engaged is inserted into the hole 54 of the wedge member 52 and the opening 25 of the main pipe 22 in advance. At this time, the packing 57 is inserted between the flange portion 62 of the guide member 61 and the wedge member 52.
FIG. 8C shows a state in which the cylindrical portion 36 of the cylindrical member 32 is being inserted into the hole 54 of the wedge member 52 and the opening 25 of the main pipe 22. When completely inserted, the packing 57 is sandwiched between the flange portion 62 of the guide member 61 and the wedge member 52.

  The cylindrical member 32 is engaged with and integrated with the guide member 61. As shown in FIG. 4, the guide member 61 has the same diameter portion 68 whose length is shorter than the thickness of the tube wall of the main pipe 22 and the tapered portion 69 which reduces the diameter from the same diameter portion 68 to the terminal side. First, the tapered portion 69 of the guide member 61 smoothly guides the tubular member 32 into the opening 25 in the tubular member 32 engaged with the guide member 61. The same diameter portion 68 of the guide member 61 is screwed with the engaging portion 46 of the fixing member 41 and the locking portion 37 of the cylindrical member 32 so that the cylindrical portion 36 of the cylindrical member 32 is in the opening 25. Guide smoothly to the center of the That is, the guide member 61 performs the centering function of guiding the cylindrical portion 36 of the cylindrical member 32 in the opening 25.

  Further, the flange portion 52 a of the flange member 52 is formed in a shape that is smaller in diameter than the outer diameter of the main pipe 22 and substantially follows the outer diameter of the main pipe 22. The collar 52 a substantially positions the tubular member 32 on the main pipe 22. The term "slow diameter" as used herein means that the curvature of the flange portion 52a is a curvature that is substantially the same as the curvature of the outer diameter of the main pipe 22 and that is gentler than the outer diameter of the main pipe 22. The flange 52a of the first embodiment is, for example, R108 mm. Therefore, even if the size of the outer diameter of the main pipe 22 is changed from 165 mm to about 216 mm, the branch joint 30 can be attached to the main pipe 22 in the range of the loose diameter of the wedge member 52. Further, since the wedge member 52 is formed separately from the cylindrical member 32, the wedge member 52 is replaced with another wedge member 52 having a different curvature of the wedge portion 52a according to the size of the outer diameter of the main pipe 22. it can. The flange portion 52 a of the wedge member 52 covers the opening 25 of the main pipe 22 and abuts on the outer diameter of the main pipe 22, whereby the cylindrical member 32 is substantially positioned in the opening 25.

  Next, as shown in FIG. 8D, the fixing member 41 integrated with the inclined member 71 is screwed into the cylindrical member 32 in a substantially positioned state from the inside of the main pipe 22 to the opening 25 of the main pipe 22. Fix them together. In addition, since this operation is performed inside the main pipe 22, the lid 23 (see FIG. 1) covering the upper portion of the main pipe 22 is opened. The inclined member 71 has a spherical portion 72 (inclined portion) that abuts on the edge 25 a of the opening 25 of the main pipe 22. The spherical portion 72 has a tip portion 72a (see FIGS. 2 and 6) smaller in diameter than the outer diameter of the guide portion 61a (see FIGS. 2 and 4) of the guide member 61. In addition, the spherical portion 72 forms the root portion 72 b (see FIGS. 2 and 6) larger in diameter than the opening 25.

  The spherical surface portion 72 in the first embodiment is formed to have a curvature R30 mm which is steeper than the inner diameter of the main pipe 22. The tip end portion 72a of the spherical surface portion 72 has a spherical surface of R 30 mm so that the spherical surface portion 72 does not contact the guide portion 61a when engaged with the locking portion 37 of the cylindrical member 32 engaging the guide member 61. The tip end is cut off with a dimension smaller than the outer diameter of the same diameter portion 68 of the guide portion 61a. Since the spherical portion 72 is tapered toward the engaging portion 46 of the fixing member 41 and the cylindrical member 32, the fixing member 41 engaged with the inclined member 71 is formed by opening the central axis of the fixing member 41. The centering function to match the center axis of In addition, since the spherical surface portion 72 is a spherical surface connecting the root portion 72b and the tip portion 72a by a curve, the spherical surface portion 72 abuts on the edge 25a of the opening 25 along the inner diameter of the main pipe 22. As a result, centering with less rattling can be achieved with respect to the aperture 25.

The tip end portion 72 a of the spherical portion 72 is formed smaller in diameter than the outer diameter of the guide portion 61 a of the guide member 61. Therefore, the fixing member 41 engaged with the inclined member 71 can smoothly guide the branch joint 30 from the inside of the main pipe 22 in the opening 25. Then, the guide member 61 smoothly guides the branch joint 30 from the outer side of the main pipe 22 toward the center in the opening 25. As described above, the guide member 61 and the inclined member 71 guide the branch joint 30 in the central direction of the opening 25 of the main pipe 22 from the outside of the main pipe 22 and the inside of the main pipe 22. For this reason, the branch joint 30 can be attached with high precision also to the opening 25 which has variation in dimensions. Further, since the branch joint 30 can exchange the guide member 61 of the main body 31 and the inclined member 71, the centering function can be effectively exhibited in accordance with the size of the hole 25 formed in the main pipe 22.
The tightening torque of the fixing member 41 is, for example, about 5.00 N · m. The preferable tightening torque in the first embodiment is 0.77 N · m or more that can ensure the water resistance of the branch joint 30.

Further, the guide member 61 and the inclined member 71 do not abut each other inside the opening 25 of the main pipe 22 and have a gap.
Specifically, the dimensions of the gap are determined by the engagement portion 46 of the fixing member 41 and the engagement portion 37 of the cylindrical member 32 without providing the packing 56 on the lower surface 52b (see FIG. 2) that abuts the main pipe 22 of the wedge member 52. In the case where the bifurcated joint 30 is fixed to the hole 25 of the main pipe 22 by engaging the two, the distance between the guide member 61 and the spherical portion 72 is approximately 0.51 mm.
A packing 56 of 5 mm is provided on the lower surface 52b (see FIG. 2) in contact with the main pipe 22 of the wedge member 52 under no load, and engagement between the locking portion 37 of the cylindrical member 32 and the engagement portion 46 of the fixing member 41 In the case where the packing 56 is crushed to have a thickness of about 2 mm, the dimension of the clearance is about 1.42 mm.
Further, a 5 mm packing 56 is provided on one lower surface 52 b of the wedge member 52 in an unloaded state, and the packing 56 is crushed by the engagement of the locking portion 37 of the cylindrical member 32 and the engagement portion 46 of the fixing member 41. The dimension of the gap when the thickness is about 1 mm is about 0.97 mm.

That is, regardless of the presence or absence of the packing 56, the guide member 61 and the spherical portion 72 do not abut each other when the branch joint 30 is fixed to the main pipe 22. For this reason, even if the fixing member 41 is additionally tightened according to the temperature change or the deterioration of the packing 56 due to many years of use, the spherical portion 72 and the guide member 61 do not abut each other.
Further, the distance between the spherical portion 72 and the guide member 61 is determined by the packing 57 (see FIGS. 2A and 2B) provided between the locking surface 62b of the flange portion 62 and the flat portion 55 of the wedge member 52. Can also be secured.

  Next, as shown in FIG. 8E, the auxiliary pipe 20 is connected to the flange portion 33 side of the branch joint 30 fixed to the main pipe 22. In the first embodiment, the auxiliary pipe 20 is inserted from the side of the flange portion 33 of the cylindrical member 32 until it abuts on the step portion 35 (see FIG. 2). The drain 16 of the latent heat recovery type gas water heater 1 can be discharged from the main pipe 22 to the downstream pipe 24 by the connection between the sub pipe 20 and the main pipe 22 via the branch joint 30.

  A sealing mechanism may be provided at the connection portion with the sub pipe 20 in the branch joint 30 for discharging the drain 16 from the sub pipe 20 to the main pipe 22 via the branch joint 30. When the water sealing mechanism is provided in the branch joint 30, a dedicated trap can be inserted and connected, and attachment and detachment for maintenance can be performed. Further, the sealing mechanism may be configured, for example, by combining a general-purpose pipe and a joint.

  In addition, the connection method of piping (for example, subtube 20) connected with the branch coupling 30 is not limited to the interpolation to the branch coupling 30. FIG. For example, a cylindrical shape may be extended and formed from the end by the side of flange 33 of cylindrical member 32, and subtube 20 may be extrapolated and connected to the peripheral face of the cylindrical shape concerned. Moreover, the connection to the cylindrical member 32 of the sub pipe 20 may be firmly connected using an adhesive, or even if the sub pipe 20 and the cylindrical member 32 are provided with a threaded portion and screwed and connected Alternatively, the auxiliary pipe 20 and the tubular member 32 may be connected by pressure. Further, for example, a groove may be formed on the inner peripheral surface of the through hole 34 of the cylindrical member 32 of the first embodiment, and packing may be provided in the groove to improve the water resistance between the branch joint 30 and the pipe.

Next, with reference to FIGS. 9 to 13, it will be described that the branch joint 30 can be attached with high accuracy even when there is a variation in the dimension of the opening 25. In each of the following embodiments, the outer diameter of the same diameter portion 68 of the guide member 61 is 34.5 mm. Further, the spherical portion 72 of the inclined member 71 is formed into a spherical surface of R 30 mm which has a curvature steeper than the inner diameter of the main pipe 22.
First, the case where the branch joint 30 is attached to the main pipe 22A having an outer diameter of 165 mm, a tube wall thickness of 5.1 mm, and an inner diameter of 154 mm with an approximate inner diameter will be described based on FIGS. (First to third application examples).

<First application example>
First, a first application example will be described based on FIG. In the main pipe 22A of this application example shown in FIG. 9A, an opening 25A having a diameter of 35 mm is bored. The worker engages the guide member 61 with the cylindrical member 32 and inserts the cylindrical portion 36 of the cylindrical member 32 into the opening 25A. The tubular member 32 can be smoothly inserted into the hole 25A by the action of the tapered portion 69 of the guide member 61. The same diameter portion 68 of the guide member 61, which is 34.5 mm, which is substantially the same diameter as the diameter 35 mm of the opening 25A of the main pipe 22A, is the circumferential surface and part of the opening 25A as the cylindrical member 32 is inserted. Abut. The same diameter portion 68 of the guide member 61 functions as a centering function for guiding the cylindrical member 32 in the center direction of the opening 25A. When the wedge member 52 covers the opening 25A of the main pipe 22A and abuts on the outer diameter of the main pipe 22A, the cylindrical member 32 is substantially positioned in the opening 25A.

The fixing member 41 is attached to the cylindrical member 32 in the substantially positioned state from the inside of the main pipe 22A via the inclined member 71. When the branch joint 30 is fixed to the opening 25A of the main pipe 22A by the fixing member 41, the spherical surface portion 72 of the inclined member 71 abuts on the inner diameter (inner circumferential surface) of the main pipe 22A. Since the inner diameter of the main pipe 22A is cylindrical, when the spherical portion 72 is pressed against the opening 25A from the inside of the main pipe 22A, the spherical portion 72 partially abuts on the edge 25a of the opening 25A.
In FIG. 9B, a portion (contact portion 26A) in contact with the projection line of the opening 25A is highlighted by a thick line. As shown in FIG. 9B, the spherical portion 72 abuts on both sides of the hole 25A in the axial direction of the main pipe 22A with a predetermined length (forms the abutting portion 26A).
The length (the length of the contact portion 26A of FIG. 9B) of the portion projected in the axial direction of the opening 25A with respect to the opening 25A is called the contact portion projection length. . Further, the circumferential length of the opening 25A (the circumferential length when the opening 25A is projected in the axial direction) is referred to as the entire circumferential length. At this time, the ratio of the projected length of the contact portion to the entire circumferential length of the opening 25A is defined as follows.
Contact area ratio (%) = 100 × contact area projected length (mm) / total circumferential length (mm)

  In the first application example shown in FIG. 9, the total circumferential length is about 109.96 mm, and the projected contact length is about 38.47 mm. Therefore, the contact portion ratio with the spherical portion 72 at the edge 25a of the aperture 25A is about 35%. The contact portion ratio indicates that the spherical portion 72 is in contact with the edge 25a of the aperture 25A by about 35% (about 1/3). This means that the spherical portion 72 performs the centering function about 1/3 with respect to the edge 25a. In other words, when the diameter of the hole 25A is 35 mm, about 2/3 of the entire circumferential length of the portion corresponding to the diameter 35 mm of the spherical portion 72 does not perform the centering function.

  However, in the first application example, the same diameter of the guide member 61 is obtained by inserting the cylindrical member 32 into the opening 25A and screwing the engaging portion 46 of the fixing member 41 and the locking portion 37 of the cylindrical member 32. The portion 68 abuts against the opening 25A to perform the centering function. That is, in this application example, the centering function by the same diameter portion 68 of the guide member 61 and the centering function by the spherical portion 72 of the inclined member 71 function as a centering function to guide the branch joint 30 to the opening 25A. Do. Therefore, the branch joint 30 can be accurately attached to the opening 25A of the main pipe 22A by the engagement of the locking portion 37 of the cylindrical member 32 and the engagement portion 46 of the fixing member 41.

Second application example
Next, a second application example will be described based on FIG. In the main pipe 22A of this application example, a hole 25B having a diameter of 38 mm is bored. When the branch joint 30 is fixed to the opening 25B of the main pipe 22A, the spherical surface portion 72 of the inclined member 71 abuts on the edge 25a of the opening 25B. When the diameter of the aperture 25B is 38 mm, the length (projected portion projected length) of the portion (abutment portion 26B) where the spherical portion 72 and the aperture 25B contact is approximately 76.42 mm, and the aperture 25B is The total circumferential length of is about 119.38 mm. Therefore, the contact portion ratio between the spherical portion 72 and the opening 25B is about 64%.

The contact portion ratio means that about 2/3 of the entire circumferential length of the portion corresponding to the diameter 38 mm of the spherical portion 72 fulfills the centering function. In other words, in the second application example, about 1⁄3 of the entire circumferential length of the portion corresponding to the diameter 38 mm of the spherical portion 72 does not perform the centering function.
However, in the second application example, the same diameter of the guide member 61 is obtained by inserting the cylindrical member 32 into the opening 25B and screwing the engaging portion 46 of the fixing member 41 and the locking portion 37 of the cylindrical member 32. The portion 68 performs an auxiliary centering function while being in contact with the opening 25B. That is, when the diameter of the opening 25B is 38 mm, the auxiliary centering function by the same diameter portion 68 of the guide member 61 and the centering function by the spherical surface portion 72 of the inclined member 71 complement each other, and the branch joint 30 is formed. Can be guided to the opening 25B for centering.

<Third application example>
Next, a third application example will be described based on FIG. In the main pipe 22A of this application example, a hole 25C having a diameter of 40 mm is bored. When the branch joint 30 is fixed to the opening 25C of the main pipe 22A, the spherical surface portion 72 of the inclined member 71 abuts on the edge 25a of the opening 25C.
In the third application example, the length (contact part projected length) of the portion (contact part 26C) at which the spherical part 72 and the edge 25a of the opening 25C contact is approximately 111.43 mm. The total circumference is about 125.66 mm. Therefore, the contact portion ratio between the spherical portion 72 and the opening 25C is about 89%.

  The contact portion ratio means that about 89% of the entire circumferential length of the spherical portion 72 corresponding to a diameter of 40 mm fulfills the centering function. Even when the cylindrical member 32 is inserted into the opening 25C, the same diameter portion 68 of the guide member 61 and the opening 25C screw the engaging portion 46 of the fixing member 41 and the locking portion 37 of the cylindrical member 32. Even then, there is almost no contact. Therefore, the guide member 61 hardly performs the auxiliary centering function. However, in the third application example, most of the length of the circumferential equivalent portion of the spherical surface portion 72 of the inclined member 71 performs the centering function of guiding the branch joint 30 to the opening 25C. That is, in the third application example, the spherical surface portion 72 performs a sufficient centering function.

  In the first to third application examples described above, the outer diameter of the main pipe 22A is 165 mm. Further, the wedge member 52 of the main body 31 has a radius smaller than the outer diameter of the main pipe 22A and forms a curvature of R108 mm in the direction along the outer diameter of the main pipe 22A. For this reason, even if the size of the main pipe 22A is changed to another main pipe 22A having an outer diameter of 165 mm, an approximate inner diameter of 154 mm, and a thickness of the pipe wall of not 5.1 mm, the wedge member 52 It is in close contact with the outer diameter of the main pipe 22A in the range of the small diameter of the wedge member 52, and the water resistance and fixability of the branch joint 30 can be secured.

  In the fourth to sixth applications described below with reference to FIGS. 12 to 14, the branch joint 30 has an outer diameter of 216 mm, a tube wall thickness of 6.5 mm, and an inner diameter of approximately 202 mm. The case where the branch joint 30 is attached to the main pipe 22B will be described (fourth to sixth application examples).

Fourth application example
A fourth application example will be described based on FIG. In the main pipe 22B of this application example, a hole 25D having a diameter of 35 mm is bored.
The worker engages the guide member 61 with the cylindrical member 32 and inserts the cylindrical member 32 whose opening amount of the insertion cylindrical portion 32a is adjusted to the thickness of the main pipe 22B into the opening 25A. When the branch joint 30 is fixed to the opening 25D of the main pipe 22B, the spherical surface portion 72 of the inclined member 71 abuts on the edge 25a of the opening 25D. When the diameter of the aperture 25D is 35 mm, the length (projected portion projected length) of the portion (abutment portion 26D) where the spherical portion 72 and the aperture 25D contact is approximately 45.18 mm, and the aperture 25D is The total circumferential length of is about 109.96 mm. Therefore, the contact portion ratio between the spherical portion 72 and the opening 25D is about 41%.
In the fourth application example, the same diameter portion 68 of the guide member 61 abuts against the opening 25D to perform the centering function, whereby the branch joint 30 can be accurately attached to the opening 25D of the main pipe 22B.

Fifth application example
A fifth application example will be described based on FIG. In the main pipe 22B of this application example, a hole 25E having a diameter of 38 mm is bored. When the branch joint 30 is fixed to the opening 25E of the main pipe 22B, the spherical surface portion 72 of the inclined member 71 abuts on the edge 25a of the opening 25E. When the diameter of the opening 25E is 38 mm, the length of the portion (contacting portion 26E) where the spherical portion 72 contacts the opening 25E (contacting portion projected length) is about 101.47 mm, and the opening 25E is The total circumferential length of is about 119.38 mm. Therefore, the contact portion ratio between the spherical portion 72 and the opening 25E is about 85%. Therefore, in the fifth application example, the auxiliary centering function by the same diameter portion 68 of the guide member 61 and the centering function by the spherical surface portion 72 of the inclined member 71 complement each other, and the branch joint 30 is guided to the opening 25E. You can center it and attach it precisely.

Sixth Application Example
A sixth application example will be described based on FIG. In the main pipe 22B of this application example, a hole 25F having a diameter of 40 mm is bored. When the branch joint 30 is fixed to the opening 25F of the main pipe 22B, the spherical surface portion 72 of the inclined member 71 abuts on the edge 25a of the opening 25F. When the diameter of the opening 25F is 40 mm, the length of the portion (contacting portion 26F) where the spherical portion 72 contacts the opening 25F (contacting portion projected length) is about 125.66 mm, and the opening 25F is The total circumferential length of is about 125.66 mm. Therefore, the contact portion ratio between the spherical portion 72 and the opening 25F is about 100%. Therefore, a sufficient centering function can be achieved by only the contact portion 26F between the spherical portion 72 and the opening 25F, and the mounting can be performed with high accuracy.

  In the fourth to sixth application examples described above, the outer diameter of the main pipe 22B is 216 mm (radius 108 mm). Further, the flange portion 52a of the wedge member 52 forms a curvature of R108 mm in the direction along the outer diameter of the main tube 22B with the same radius of curvature as the outer diameter of the main tube 22B. Therefore, the wedge member 52 can be in close contact with the outer diameter of the main pipe 22B, as in the first to third application examples described above, to ensure the waterproofness and the fixability of the branch joint 30.

  According to the branch joint 30 of the first embodiment, as shown in the first to sixth application examples, even if the dimensions of the apertures 25 (the apertures 25A, 25B, 25C, 25D, 25E, 25F) vary, The branch joint 30 can be attached to the main pipe 22 (main pipes 22A and 22B) with high accuracy, and the water blocking property and the fixing property can be secured. That is, according to the branch joint 30 of the first embodiment, the worker who drills the hole 25 does not have to be skilled in the drilling operation. Further, according to the branch joint 30 of the first embodiment, since the guide portion 61a of the guide member 61 of the main body 31 and the spherical portion 72 of the inclined member 71 center the branch joint 30 with respect to the opening 25, The branch joint 30 can be attached to the main pipe 22 with high accuracy.

  In the present embodiment, a spherical portion 72 which is a spherical surface is formed on the inclined member 71. However, even if it is not a spherical surface, the branch joint 30 can be centered with respect to the aperture 25 if it has an inclination (for example, a linear taper or the like). That is, the present invention is not limited to the inclination of the spherical surface, and instead of the spherical portion 72, a curved surface (for example, a linear taper) other than the spherical surface may be used. In addition, when the spherical surface portion 72 which is a spherical surface is provided, there is a more remarkable effect that centering is performed while mutually complementing the guide portion 61 a of the guide member 61. In the branch joint 30 according to the first embodiment, the guide member 61 is formed separately from the cylindrical member 32 and the wedge member 52, but may be other members. The guide member 61 may be formed integrally with the tubular member 32 or the wedge member 52.

Further, according to the branch joint 30 of the first embodiment, the worker causes the branch joint 30 to be formed in the opening 25 by the engagement of the locking portion 37 of the cylindrical member 32 and the engagement portion 46 of the fixing member 41. It can be attached. That is, the worker can shorten the time for attaching the branch joint 30 to the main pipe 22.
Further, according to the branch joint 30 of the first embodiment, the operator simply inserts the insertion cylindrical portion 32 a of the cylindrical member 32 into the opening 25 and clamps the fixing member 41 from the inside of the main pipe 22, The branch fitting 30 can be guided relative to the aperture 25. For this reason, the operator does not have to adjust the position for mounting the branch joint 30 even if there is variation in the dimensions of the opening 25. For this reason, the branch joint 30 of the first embodiment has good attachment workability.

  Further, in the case of the prior art in which the branch joint 30 is fixed from the outside of the main pipe 22, it is necessary to make the cylindrical member 32 and the wedge member 52 separate parts for exclusive use, respectively, and the number of parts increases. Costs and parts management costs will increase. However, the wedge member 52 of the branch joint 30 according to the first embodiment is formed in a shape substantially conforming to the circumferential direction of the outer diameter of the main pipe 22 with a gentle diameter smaller than the curvature of the outer diameter of the main pipe 22. For this reason, the branch joint 30 of the first embodiment can be closely attached to the outer diameter of the main pipe 22 in the range of the small diameter of the wedge member 52 and can be attached with high accuracy, and the water tightness of the branch joint 30 can be secured. Further, the wedge member 52 of the branch joint 30 of the first embodiment can be replaced with another wedge member 52 formed with a different curvature according to the size of the outer diameter of the main pipe 22. That is, according to the branch joint 30 of the first embodiment, parts can be shared, and the number of parts, the manufacturing cost, and the management cost of parts can be reduced.

  Further, according to the branch joint 30 of the first embodiment, the main pipe 22 is branched regardless of the presence or absence of the packing 56 and the packing 57 between the guide member 61 of the cylindrical member 32 and the spherical portion 72 of the inclined member 71. Even if the joints 30 are fixed, they do not abut each other. For this reason, the fixing member 41 can be additionally tightened in accordance with the temperature change, deterioration of the packing 56 due to use for many years, etc., and waterproofness can be secured. That is, in the branch joint 30 of the first embodiment, there is no need to disassemble the branch joint 30 or replace the packing 56 or the packing 57 when the water barrier property is reduced due to the use for many years. In other words, the branch joint 30 of the first embodiment does not require much time for maintenance.

  Further, in the branch joint 30 of the first embodiment, the wedge member 52 is formed in a shape having a diameter smaller than the outer diameter of the main pipe 22 and substantially along the outer diameter of the main pipe 22. For this reason, even if the branch joint 30 changes the size of the main pipe 22 to which the branch joint 30 is attached, the wedge member 52 can be in close contact with the outer diameter of the main pipe 22 to ensure waterproofness and fixability of the branch joint 30 . For this reason, the branch joint 30 of the first embodiment can share parts for the main pipes 22 of different sizes, and can reduce manufacturing costs and part management costs.

  In the branch joint 30 of the first embodiment, the tubular member 32 and the wedge member 52 are formed of different members, and the wedge member 52 is formed, for example, with a radius of curvature R108 mm. The branch joint 30 has shown the example attached to the main pipe 22A of outer diameter 165 mm (radius 82.5 mm) as a 1st-3rd application example. Moreover, the example attached to the main pipe 22B of outer diameter 216 mm (radius 108 mm) was shown as a 4th-6th application example. As described above, by setting the radius of curvature of the wedge member 52 to the same radius as the outer diameter of the main pipe 22A or a smaller diameter, it is possible to simultaneously secure the waterproofness and the fixability.

The wedge member 52 is formed separately from the cylindrical member 32. Therefore, according to the outer diameter of the main pipe 22, it can replace | exchange for the wedge member 52 provided with the wedge part 52a of a different curvature radius.
FIGS. 15A to 15C show three types of wedge members 52A, 52B and 52C having three curvature radii r1 to r3 arranged to cover the periphery of the opening 25 of the main pipe 22, respectively. .
The radius of curvature r1 of the flange portion 52Aa of the wedge member 52A shown in FIG. 15 (A) matches the radius of curvature of the outer diameter of the main pipe 22 (a state equivalent to those of the application examples 4 to 6). For example, with respect to the main pipe 22 having an outer diameter of 216 mm (radius 108 mm), the curvature radius r1 of the flange 52Aa is R108 mm.
Thus, in the case of selecting the wedge member 52A having a radius of curvature that matches the outer diameter of the main pipe 22, it is possible to secure waterproofness and fixability.

On the other hand, the radius of curvature r2 of the ridge portion 52Ba of the wedge member 52B shown in FIG. 15B is smaller than the radius of curvature of the outer diameter of the main pipe 22. For example, with respect to the main pipe 22 having an outer diameter of 216 mm (radius 108 mm), the curvature radius r2 of the wedge member 52B is R90 mm.
In this case, the pinching portion 52Ba of the wedge member 52B is deformed along the outer diameter of the main pipe 22 by the clamping pressure of the fixing member 41 and the cylindrical member 32. Therefore, the surface pressure between the flange portion 52Ba and the outer periphery of the main pipe 22 is increased, and the water barrier property can be further enhanced. However, in the case of the difference in the curvature radius exceeding the range in which the flange portion 52Ba can be deformed, there is a possibility that it may cause water leakage. Therefore, if the curvature radius is smaller than the outer diameter of the main pipe 22 as in the wedge member 52B, the application range becomes narrow.
Specifically, with respect to the radius of the outer diameter of the main pipe 22, it is preferable that the curvature radius r2 of the ridge portion 52Ba of the ridge member 52B be 65% or more. For example, a 5 mm packing 56 is provided on the lower surface 52b (see FIG. 2) in contact with the main pipe 22 of the wedge member 52 under no load condition, and the locking portion 37 of the cylindrical member 32 and the engagement portion 46 of the fixing member 41 Under the condition that the packing 56 is crushed by 3 mm to a thickness of about 2 mm and the entire surface of the packing 56 contacts the main pipe 22, the radius of curvature of the flange 52Ba of the wedge member 52B is 216 mm It is preferable that the curvature radius r2 of the wedge member 52B be 70 mm or more with respect to the main pipe 22 having a radius of 108 mm.

The radius of curvature r3 of the ridge portion 52Ca of the wedge member 52C shown in FIG. 15C is larger than the radius of curvature of the outer diameter of the main pipe 22 (i.e., it is a loose diameter, and is equivalent to application examples 1 to 3) ). For example, with respect to the main pipe 22 having an outer diameter of 216 mm (radius of 108 mm), the curvature radius r3 of the ridge portion 52Ca is set to R120 mm.
As described above, even if the wedge member 52C having a radius of curvature smaller than the outer diameter of the main pipe 22 is selected, water repellency and fixation can be secured. However, if the curvature radius r3 of the ridge portion 52Ca of the wedge member 52 is too large with respect to the curvature radius of the outer diameter of the main tube 22, the ridge portion 52Ca does not follow the outer periphery of the main tube 22 and a gap is generated There is a possibility that it can not be secured.
Specifically, with respect to the radius of the outer diameter of the main pipe 22, it is preferable that the curvature radius r3 of the ridge portion 52Ca of the ridge member 52C be 150% or less. For example, a 5 mm packing 56 is provided on the lower surface 52b (see FIG. 2) in contact with the main pipe 22 of the wedge member 52 under no load condition, and the locking portion 37 of the cylindrical member 32 and the engagement portion 46 of the fixing member 41 Under the condition that the packing 56 is crushed 3 mm to a thickness of about 2 mm by the engagement of the above and the entire surface of the packing 56 is in contact with the main pipe 22, the radius of curvature of the flange 52Ca is 216 mm in outer diameter (108 mm in radius) It is preferable that the curvature radius r3 of collar part 52Ca with respect to the main pipe 22 is 160 mm or less.

When the curvature radius of the collar 52a (barrels 52Aa to 52Ca) of the collar member 52 (barrels 52A to 52C) does not match the outer diameter of the main pipe 22, that is, with respect to the radius of the outer diameter of the main pipe 22 If the curvature radius of the wedge member 52 is less than 65% or more than 150%, there is a possibility that sufficient water blocking can not be secured.
In the branch joint 30 of the present embodiment, since the wedge member 52 is formed as a separate member from the cylindrical member 32, the wedge member 52 can be selected according to the outer diameter of the main pipe 22. Therefore, if the wedge members 52 are prepared in a plurality of sizes and the wedge members 52 are used according to the size of the main pipe 22, the branch joint 30 can ensure water tightness according to the pressure of the fluid and the application, A wide range of changes in the dimensions of the main pipe 22 can be dealt with only by replacement. Then, as shown in FIG. 5, it is further preferable to provide a display unit 53 on the upper surface 52 c of the wedge member 52 so as to indicate the range of the outer diameter of the main pipe to which the wedge member 52 can be applied.
Further, in the branch joint 30 according to the first embodiment, the shape of the flange portion 52 a of the wedge member 52 is prepared in a plurality of types with a gentle radius of curvature gentler than the curvature of the outer diameter of the main pipe 22. A plurality of types of curvatures are prepared with substantially the same curvature as the curvature. Thus, the branch joint 30 can be adapted to a wider range of the main pipe 22 only by changing the wedge member 52.

  Moreover, the branch coupling 30 of 1st Embodiment forms the cylindrical member 32 of the main body 31, the guide member 61, and the collar member 52 with another member. Then, the packing 58 is disposed between the flange portion 62 of the guide member 61 and the flange portion 33 of the cylindrical member 32. The surfaces 33a and 62b of the flanges 62 and 33 facing the packing 58 are flat. Further, the wedge member 52 is formed by projecting a flat portion 55 opposed to the locking surface 62 b of the flange portion 62 of the guide member 61 from the other side of the wedge member 52, and the locking surface 62 b of the flange portion 62 and the wedge member 52 A packing 57 having a function of improving water repellency is disposed between the flat portion 55 and the flat portion 55. For this reason, the main body 31 can prevent the leakage of water from the assembly unit and the intrusion of unknown water.

  Further, the hole 54 of the wedge member 52 of the first embodiment is formed by projecting the flat portion 55 in contact with the locking surface 62 b of the flange portion 62 from the other of the wedge member 52, and the flat portion 55 and the flange portion 62 The face contact may be other. For example, when the fixing member 41 is engaged with the cylindrical member 32 from the inside of the main pipe 22 and the branch joint 30 is fixed to the main pipe 22 as in the first embodiment, the flat portion 55 or the locking surface 62b A protrusion may be formed on one of the opposing surfaces, and a hole that can be fitted to the protrusion may be formed on the other of the opposing surfaces. When the projection and the hole are fitted to each other, the guide member 61 and the wedge member 52 can be integrated and the main body 31 can be handled as an integral member. Becomes easier. Further, by forming the projection and the hole which can be fitted to each other in this manner to the flat portion 55 and the locking surface 62b, when the fixing member 41 is screwed to the cylindrical member 32, the wedge member 52 is a main pipe Since it follows the line 22, feeding of the cylindrical member 32 can be suppressed.

  Further, in the branch joint 30 of the first embodiment, the hole 54 of the wedge member 52 and the same diameter portion 68 of the guide member 61 are formed to have substantially the same diameter or a little smaller, and the wedge member 52 and the guide member 61 are fitted. it can. Thus, when the wedge member 52 and the guide member 61 can be fitted, the worker can handle the main body 31 as an integral member by connecting the cylindrical member 32 and the wedge member 52 via the guide member 61. Therefore, the insertion work to the hole 25 and the fixing work by the fixing member 41 become easy.

  The branch joint 30 of the first embodiment allows the drain 16 of the latent heat recovery type gas water heater 1 to flow through the main pipe 22. The outer diameter of the same diameter portion 68 of the guide member 61 is 34.5 mm, the tip end portion 72a of the inclined member 71 is 33.4 mm, and the root portion 72b is 49.5 mm. Moreover, the inclination of the inclination member 71 is R30 mm. The combination of the guide member 61 and the inclined member 71 exhibits a centering function when the branch joint 30 is attached when the dimensions of the opening 25 of the main pipe 22 vary.

Next, a combination of the guide member 61 and the inclined member 71 will be described based on FIG.
In the branch joint 30 according to the first embodiment, the cylindrical member 32 of the main body 31, the guide member 61, and the wedge member 52 are formed as separate members, and the guide member 61 can be replaced. The branch joint 30 of the present embodiment further enhances the centering function of the branch joint 30 when using the branch joint 30 in a place where a large amount of water flows or a place where high water pressure is applied, and secures high water stopping property and fixation. For this purpose, a plurality of types of guide members 61 (61A, 61B, 61C) and a plurality of types of inclined members 71 (71A, 71B, 71C) can be used in combination.

  The branch joint 30 in which a plurality of types of guide members 61A, 61B, and 61C can be combined with a plurality of types of inclined members 71A, 71B, and 71C can enhance the centering function and ensure high waterproofness and fixation. Specifically, the combination of the guide member 61A corresponding to the opening 35 mm and the inclined member 71A, the combination of the guide member 61B corresponding to the opening 38 mm and the inclination member 71B, and the guide member 61C corresponding to the opening 40 mm. The water blocking property and the fixing property are secured by the combination of the and the inclined member 71C.

FIG. 16A is a view showing a combination of the guide member 61 and the inclined member 71 in the branch joint 30 of the first embodiment described above. The combination of the first embodiment is referred to as pattern 1. In pattern 1, the guide member 61 (61A) and the inclined member 71 (71C) are combined.
In the pattern 1, the same diameter portion 68 (68A) of the guide member 61 is formed to have a diameter of 34.5 mm.
In pattern 1, the inclined member 71 is formed such that the tip end portion 72a (tip end side) of the spherical portion 72 has a diameter of 33.4 mm, and the diameter of the root portion 72b (other end side) of the spherical portion 72 is 49.5 mm. Do. Then, the spherical portion 72 is formed into a spherical surface of R 30 mm connecting the tip end portion 72 a and the root portion 72 b by a curve.
The branch joint 30 of the pattern 1 of the first embodiment is applicable to the hole 25 of the main pipe 22 having a wide range of diameters. On the other hand, the dimensions may not necessarily be optimum with respect to the diameter of the opening 25.

FIG. 16B is a view showing a combination of patterns 2. In pattern 2, the guide member 61A (61) and the inclined member 71A are combined.
In the pattern 2, the same diameter portion 68A of the guide member 61A is formed to have a diameter of 34.5 mm. The guide member 61 </ b> A of the pattern 2 is the same guide member as the guide member 61 of the pattern 1.
In pattern 2, the inclined member 71A is formed such that the tip end portion 72Aa (tip end side) of the spherical portion 72A is 32.0 mm in diameter, and the diameter of the root portion 72Ab (other end side) of the spherical portion 72A is 42.7 mm Do. Then, the spherical surface portion 72A is formed into a spherical surface of R22.9 mm connecting the tip portion 72Aa and the root portion 72Ab with a curve.
The combination of the guide member 61A of the pattern 2 and the inclined member 71A is an optimum combination when the hole 25 has a diameter of 35 mm. That is, by adopting the combination of the patterns 2, it is possible to easily assemble and accurately center the hole 25 having a diameter of 35 mm.

FIG. 16C shows a combination of patterns 3. In pattern 3, the guide member 61B and the inclined member 71B are combined.
In the pattern 3, the same diameter portion 68B of the guide member 61B is formed to have a diameter of 37.5 mm.
In pattern 3, the inclined member 71B is formed such that the tip end portion 72Ba (tip end side) of the spherical portion 72B has a diameter of 32.5 mm, and the diameter of the root portion 72Bb (other end side) of the spherical portion 72B is 47.9 mm. Do. Then, the spherical surface portion 72B is formed into a spherical surface of R28.4 mm connecting the tip portion 72Ba and the root portion 72Bb with a curve.
The combination of the guide member 61B of the pattern 3 and the inclined member 71B is an optimum combination when the hole 25 has a diameter of 38 mm. That is, by adopting the combination of the patterns 3, it is possible to easily assemble and accurately center the hole 25 having a diameter of 38 mm.

FIG. 16D shows a combination of patterns 4. In the pattern 4, the guide member 61C and the inclined member 71C (71) are combined.
In the pattern 4, the same diameter portion 68B of the guide member 61C is formed to have a diameter of 39.5 mm.
In the pattern 4, the inclined member 71C is formed such that the tip end portion 72Ca (tip end side) of the spherical portion 72C is 33.4 mm in diameter, and the diameter of the root portion 72Cb (other end side) of the spherical portion 72C is 49.5 mm Do. Then, the spherical portion 72C is formed into a spherical surface of R 30 mm connecting the tip portion 72Ca and the root portion 72Cb with a curve. The inclined member 71C of the pattern 4 is the same inclined member as the inclined member 71 of the pattern 1.
The combination of the guide member 61C of the pattern 4 and the inclined member 71C is an optimum combination when the hole 25 has a diameter of 40 mm. That is, by adopting the combination of the patterns 4, easy assembly and accurate centering can be achieved for the holes 25 having a diameter of 40 mm.

And the combination of a guide member (61A, 61B, 61C) and an inclination member (71A, 71B, 71C) is formed in a different color for every combination by the dimension of the corresponding opening 25. FIG.
For example, the guide member 61A and the inclination member 71A of the pattern 2 corresponding to the opening 35 mm are formed in blue. The guide member 61B and the inclined member 71B of the pattern 3 corresponding to the opening 38 mm are formed in yellow. The guide member 61C and the inclined member 71C of the pattern 4 corresponding to the opening 40 mm are formed in red.
By this color-coded formation, the operator can visually confirm the combination of the guide members (61A, 61B, 61C) and the inclined members (71A, 71B, 71C). And since the flange part 62 is formed in the guide member 61 and the recessed part 43a which can visually recognize root part 72b of the inclination member (71A, 71B, 71C) in the fixed member 41 is formed, a worker or maintenance inspection Even after attaching the branch joint 30 to the main pipe 22, the person can visually confirm the combination of the guide portions (61A, 61B, 61C) and the inclined members (71A, 71B, 71C) from inside and outside of the main pipe 22. The confirmation of the combination of the guide members (61A, 61B, 61C) and the inclined members (71A, 71B, 71C) is not limited to coloring, but may be display of symbols, dimensions, etc. or texture such as surface finish.

The combination of pattern 2 (FIG. 16B) will be described in detail.
In the case where the centering function of the branch joint 30 is enhanced and attached to the hole 25 of 35 mm, the worker selects the guide member 61A and the inclined member 71A of the pattern 2 formed in blue. The outer diameter of the guide member 61A is 34.5 mm, which corresponds to the hole 25 of 35 mm.
The worker engages the guide member 61A with the cylindrical member 32 and inserts the cylindrical member 32 into the opening 25 of the main pipe 22. Then, the tapered portion 69 of the guide member 61A smoothly guides the tubular member 32 into the 35 mm hole 25. Then, the same diameter portion 68A of the guide member 61A smoothes the cylindrical member 32 in the central direction in the opening 25 by screwing the engaging portion 46 of the fixing member 41 and the locking portion 37 of the cylindrical member 32. Guide to That is, when the opening 25 is 35 mm, the guide member 61A slightly smaller in diameter than the opening 25 functions as a centering function to effectively guide the tubular member 32 in the opening 25.

And the fixing member 41 which unifies the inclination member 71A formed in blue from the inner side of the main pipe 22A is attached to the cylindrical member 32 in the substantially positioned state. The spherical portion 72A of the inclined member 71A abuts on the inner diameter of the main pipe 22A. Since the inner diameter (inner peripheral surface) of the main pipe 22A is cylindrical, the spherical portion 72A partially abuts on the edge 25a of the aperture 25.
The inclined member 71A has a spherical portion 72A of R22.9 mm. Therefore, when the branch joint 30 is attached to the main pipe 22A (see FIG. 9) having an outer diameter of 165 mm, a pipe wall thickness of 5.1 mm, and an inner diameter of about 154 mm, the contact ratio is about 70 It becomes%. When the branch joint 30 is attached to the main pipe 22B (see FIG. 12) having an outer diameter of 216 mm, a pipe wall thickness of 6.5 mm and an inner diameter of about 202 mm, the contact ratio is about 100% It becomes.

The combination of pattern 3 (FIG. 16C) will be described in detail.
In the case where the centering function of the branch joint 30 is enhanced and attached to the hole 25 of 38 mm, the operator selects the guide member 61B and the inclined member 71B which are formed in yellow. The outer diameter of the guide member 61B is 37.5 mm, which corresponds to the hole 25 of 38 mm.
The worker engages the cylindrical member 32 with the guide member 61A engaged with the cylindrical member 32. Then, the tapered portion 69 of the guide member 61B smoothly guides the tubular member 32 into the hole 25 of 38 mm. The same diameter portion 68B of the guide member 61B smoothly engages the cylindrical member 32 in the central direction within the opening 25 by screwing the engaging portion 46 of the fixing member 41 and the locking portion 37 of the cylindrical member 32. Guide to That is, when the opening 25 is 38 mm, the guide member 61 B slightly smaller in diameter than the opening 25 serves to center the tubular member 32 effectively in the opening 25.

And the fixing member 41 which unifies the inclination member 71B formed in yellow from the inner side of the main pipe 22A is attached to the cylindrical member 32 in the substantially positioned state. The spherical portion 72B of the inclined member 71B abuts on the inner diameter of the main pipe 22A. Since the inner diameter (inner peripheral surface) of the main pipe 22A is cylindrical, the spherical portion 72B partially abuts on the edge 25a of the aperture 25A.
The inclined member 71B has a spherical portion 72B of R28.4 mm. Therefore, when the branch joint 30 is attached to the main pipe 22A (see FIG. 10) having an outer diameter of 165 mm, a pipe wall thickness of 5.1 mm, and an inner diameter of about 154 mm, the contact ratio is about 81 It becomes%. When the branch joint 30 is attached to the main pipe 22B (see FIG. 13) having an outer diameter of 216 mm, a pipe wall thickness of 6.5 mm and an inner diameter of about 202 mm, the contact ratio is about 100% It becomes.

The combination of pattern 4 (FIG. 16D) will be described in detail.
In the case where the centering function of the branch joint 30 is enhanced and attached to the opening 25 of 40 mm, the worker selects the guide member 61C and the inclined member 71C which are formed in red. The outer diameter of the guide member 61C is 39.5 mm, which corresponds to the opening 25 of 40 mm.
The worker engages the tubular member 32 with the guide member 61C engaged with the tubular member 32. Then, the tapered portion 69 of the guide member 61C smoothly guides the cylindrical member 32 into the opening 25 of 40 mm. Then, the same diameter portion 68C of the guide member 61C is screwed with the engaging portion 46 of the fixing member 41 and the locking portion 37 of the cylindrical member 32 so that the cylindrical member 32 in the opening 25 in the central direction. I will guide you smoothly. That is, when the opening 25 is 40 mm, the guide member 61C slightly smaller in diameter than the opening 25 functions as a centering function to effectively guide the tubular member 32 in the opening 25.

Then, a fixing member 41 for integrating the inclined member 71C formed in red from the inside of the main pipe 22A is attached to the cylindrical member 32 in the substantially positioned state. The spherical portion 72C of the inclined member 71C abuts on the inner diameter of the main pipe 22A. Since the inner diameter (inner peripheral surface) of the main pipe 22A is cylindrical, the spherical portion 72C partially abuts on the edge 25a of the aperture 25.
The inclined member 71C has a spherical portion 72C of R 30 mm. Therefore, when the branch joint 30 is attached to the main pipe 22A (see FIG. 11) having an outer diameter of 165 mm, a pipe wall thickness of 5.1 mm and an inner diameter of about 154 mm, the contact ratio is about 89 It becomes%. When the branch joint 30 is attached to the main pipe 22B (see FIG. 14) having an outer diameter of 216 mm, a tube wall thickness of 6.5 mm and an inner diameter of about 202 mm, the contact ratio is about 100% It becomes.

In this manner, the branch joint 30 combines a plurality of guide members (61A, 61B, 61C) and inclined members (71A, 71B, 71C) according to the size of the opening 25 of the main pipe 22, and the accuracy is improved. It can exhibit high centering function. That is, in the branch joint 30, first, the guide members (61 A, 61 B, 61 C) formed to have a diameter slightly smaller than the diameter of the opening 25 guide the tubular member 32 in the central direction of the opening 25. Then, in the guiding state, the inclined members (71A, 71B, 71C) having a spherical portion formed in a shape to achieve an effective guiding function by the diameter of the opening 25 contact the edge 25a of the opening 25 and branch The joint 30 can be accurately guided and fixed in the center direction of the opening 25. For this reason, the branch joint 30 can realize high waterproofness and fixability that can be coped with even when used in a place where a large amount of water flows in the branch joint 30 or a place where high water pressure is applied.
In addition, when the branch joint 30 is used in a place where a large amount of water does not flow in the branch joint 30 or a place where high water pressure is not applied, the guide member 61 (61A) and the inclined member 71 (71C) which are combinations of pattern 1 Even in combination with, it can exhibit a sufficiently high centering function.

<< Second Embodiment >>
Next, a branch joint 80 of the second embodiment will be described using FIGS. 17 (A) to 17 (C). In the second embodiment, the fixing member 41 is changed to a fixing member 91 by changing the main body 31 in the first embodiment to a main body 81 (branch joint main body). The same configuration as that of the other first embodiment is given the same number and the description is omitted.
The branch joint 80 of the second embodiment differs from the branch joint 30 (see FIG. 2) of the first embodiment in the engagement relationship for fixing the main body 81 and the fixing member 91. That is, the branch joint 80 of the second embodiment forms a female thread as the locking portion 87 of the main body 81, and forms an external thread as the engaging portion 96 of the fixing member 91, and fixes them to the main pipe 22 by screwing them. .

The main body 81 has a tubular member 82 and a wedge member 52.
The tubular member 82 has a cylindrical shape having a through hole 84 in the tubular interior, and has a tubular portion 86. On the inner peripheral surface of the through hole 84 of the cylindrical portion 86 of the cylindrical member 82, a locking portion 87 (female screw) to be engaged with the fixing member 91 is formed. A flange portion 89 and a guide portion 90 are formed on the outer peripheral surface of the cylindrical portion 86. The flange portion 89 has a locking surface 89 a that holds the wedge member 52 against the main pipe 22. The flange portion 89 divides the cylindrical portion 86 into an insertion cylindrical portion 82a and an outer cylindrical portion 82b. A rotation applying portion 83 used when the cylindrical member 82 and the fixing member 91 are engaged is formed on the outer periphery of the outer cylindrical portion 82b.
A guide portion 90 having the same diameter portion 68 and a tapered portion 69 is integrally formed from the locking surface 89 a of the flange portion 89 in the insertion cylindrical portion 82 a inserted into the opening 25 of the main pipe 22.

  As shown in an enlarged manner in FIG. 17C, in the through hole 84 of the cylindrical portion 86, the sliding surface 88 is formed in the portion where the locking portion 87 of the end of the outer cylindrical portion 82b is not formed. Do. The sliding surface 88 is formed to have a diameter substantially the same as the maximum amount of the locking portion 87 projecting radially inward of the through hole 84. The sliding surface 88 has a diameter capable of sliding with the sliding surface 98 of the opposing fixing member 91. The sliding surface 88 is formed with a groove 85 recessed outward in the radial direction. The groove portion 85 accommodates the packing 59 (O-ring, water blocking member). The sliding surface 88 of the cylindrical member 82 and the sliding surface 98 of the fixing member 91 squeeze the packing 59 housed in the groove 85 of the sliding surface 88, and the branch joint 80 forms the cylindrical member 82 and the fixing member 91. Improve the watertightness between Note that the branch joint 80 may be wound with sealing tape around the engaging portion 96 of the fixing member 91 together with the packing 59 to ensure more watertightness, and sliding on the cylindrical member 82 and the fixing member 91 A seal tape may be wound around the engaging portion 96 of the fixing member 91 without providing the surfaces 88 and 98 to ensure water tightness.

The fixing member 91 is a bolt-like member having a rotation applying portion 93 and a cylindrical portion 95.
The cylindrical portion 95 has a diameter that can be inserted into the through hole 84 of the main body 81. In the cylindrical portion 95, an engaging portion 96 (male thread) engageable with the locking portion 87 (female screw) of the main body 81 is formed in a screw shape by protruding outward in the radial direction to the outer diameter of the cylindrical portion 95. In the portion where the engaging portion 96 on the tip end side of the cylindrical portion 95 is not formed, a circumferential sliding surface 98 substantially the same as the minimum diameter at which the engaging portion 96 does not protrude radially outward is formed. In addition, the fixing member 91 forms a through hole 94 penetrating from the rotation applying portion 93 to the cylindrical portion 95. The through hole 94 of the fixing member 91 is provided with a step portion 97 which narrows the inner diameter of the through hole 94 to form a step. The stepped portion 97 is formed, for example, in the longitudinal direction intermediate portion of the fixing member 91.

  The rotation applying portion 93 of the fixing member 91 is located at the end of the cylindrical portion 95, and is formed to increase the outer diameter of the cylindrical portion 95. The fixing member 91 has a groove 45 for receiving the projection 75 of the inclined member 71 on the side of the cylindrical member 95 that protrudes. In addition, in the rotation applying portion 93 of the fixing member 91, a concave portion 43a capable of visually recognizing the root portion 72b of the inclined member 71 is formed similarly to the fixing member 41 of the first embodiment.

  In the branch joint 80 of the second embodiment, the cylindrical member 82 of the main body 81 has a guide portion 90. Further, the branch joint 80 has an inclined member 71. The guide portion 90 and the inclined member 71 exert a centering function when the branch joint 30 is attached when the dimensions of the opening 25 of the main pipe 22 vary. The worker engages the engaging portion 96 of the fixing member 91 and the locking portion 87 of the main body 81 from the inside of the main pipe 22 to attach the branch joint 80 to the opening 25 of the main pipe 22. According to the branch joint 80 of the second embodiment, the guide portion 90 of the main body 81 and the spherical surface portion 72 of the inclined member 71 guide the branch joint 80 to the hole 25, and therefore, the same as the first embodiment. The branch joint 80 can be attached to the main pipe 22 with high accuracy, and watertightness and fixation can be ensured.

  In the branch joint 80 of the second embodiment, the cylindrical member 82 of the main body 81 has a guide portion 90. When the branch joint 80 of the second embodiment is used in a place where a large amount of water flows or a place where high water pressure is applied, in order to further enhance the centering function of the branch joint 80 to ensure high water stopping property and fixing property, A plurality of cylindrical members 82 having different diameters of the same diameter portion 68 of the guide portion 90 are prepared. Thus, as in the first embodiment, the guide portion 90, the plurality of types of cylindrical members 82, and the plurality of types of inclined members (71A, 71B, 71C) are provided in accordance with the diameter of the opening 25 of the main pipe 22. In combination, the centering function can be enhanced to ensure high waterproofness and fixation.

In the case where a plurality of types of tubular members 82 integrally forming the tubular member 82 and the guide portion 90 and a plurality of types of inclined members (71A, 71B, 71C) are used, the dimensions of the corresponding apertures 25 are used. , Each combination is formed in a different color. Since the guide portion 90 of the second embodiment is integral with the cylindrical member 82, the color of the guide portion 90 may be colored including the cylindrical member 82.
By coloring the tubular member 82 having the guide portion 90, the operator or the maintenance inspector can attach the guide portion 90 and the inclined members (71A, 71B, 71C) even after attaching the branch joint 80 to the main pipe 22. The combination can be checked visually. For this reason, the worker can fix the branch joint 80 to the main pipe 22 while visually confirming the combination of the guide portion 90 and the inclined members (71A, 71B, 71C). In addition, even if there is a mounting mistake in the branch joint 80, a worker or a maintenance inspector can easily detect the mistake.

  In the branch joint 80 of the second embodiment, a groove 85 is provided in the sliding surface 88 of the through hole 84 of the main body 81 opposed to the sliding surface 98 of the fixing member 91, and the packing 59 is accommodated in the groove 85. In other words, in the branch joint 80, the packing 59 is provided in the radial gap between the main body 81 and the fixing member 91. Thereby, the water blocking property of the branch joint 80 can be further improved. The groove 85 for accommodating the packing 59 may be formed on the sliding surface 98 of the fixing member 91 without being formed on the sliding surface 88 of the main body 81. The packing 59, which is a water blocking member, can further improve the water blocking property of the branch joint 80. In addition, the packing 59 can prevent odor leakage in the drainage pipe and intrusion of unknown water from the outside of the main pipe 22.

  As described above, although the main pipe 22 is the waste water mass 22 and the sub pipe 20 is the drainage branch pipe 20 in the present embodiment, an example in which the drain 16 is discharged from the sub pipe 20 to the main pipe 22 has been described. For example, the branch joint may be configured as a pipe that discharges the drain 16 from the main pipe 22 to the sub pipe 20. Moreover, you may use a branch coupling, for example for the connection with the sewage mass 22 of FIG. 1, and the downstream pipe 24. FIG. Moreover, although the branch coupling of this embodiment was used for discharge | emission of the drain 16, it is good also as another. For example, the branch joint can also be applied to the connection of fluid channels such as other water and sewage. The branch joint can also be applied to the connection of gas flow paths such as an inflow duct and an exhaust duct.

  In the branch joint of the present embodiment, the wedge member of the main body is formed of a member different from the cylindrical member, but may be other members. For example, the wedge member may be formed integrally with the cylindrical member by forming a flange portion on the flange portion of the cylindrical member, or may be integrally formed with the guide member by forming the ridge portion on the flange portion of the guide member . The branch joint in which the wedge member is integrally formed with the cylindrical member and the guide member is inserted into the opening when the branch member is fixed to the main pipe 22 by engaging the fixing member with the cylindrical member from the inside of the main pipe 22. The work and the fixing work by the fixing member become easy.

Next, the invention included in the present embodiment will be described.
A branch joint is a branch joint which is attached to a hole to be bored in a main pipe and connects a sub pipe to form a branch passage, and on the outer periphery of a cylindrical portion and a cylindrical portion inserted into the hole of the main pipe from the outside A branch joint body provided with a flange portion to be provided and a guide portion for guiding the cylindrical portion in the opening to connect the sub-pipe, a fixing member screwed from the inside of the main pipe to the cylindrical portion of the branch joint body, and open The edge of the hole is provided with an inclined portion that abuts from the inside of the main pipe, and has an inclined member positioned between the fixing member and the main pipe, and the main pipe is held between the flange portion of the branch joint body and the inclined member.
According to this configuration, the spherical portion (inclined portion) of the inclined member is in contact with the edge of the opening when the engaging portion of the fixed member is engaged with the locking portion of the cylindrical member, with the inner diameter of the main pipe It can rotate smoothly. Further, the spherical surface portion is tapered from the root portion toward the tip portion. When inserted into the hole, rattling is small and the inner fixing member can be centered in the central axis direction of the hole smoothly.
In addition, when a large amount of water flows through the branch joint or the pressure applied to the fluid is high, by selecting and using an optimal member from among a plurality of inclined members having different sizes in accordance with the opening of the main pipe. Because the centering can be performed with high accuracy to the hole, it is possible to secure the water blocking property and the fixing property.

Further, the branch joint main body has a cylindrical member provided with a cylindrical portion, and a guide member provided with a guide portion and forming a hole through which the cylindrical member is inserted, the cylindrical member provided with a flange portion, and the guide member May be located between the flange portion and the outer peripheral surface of the main pipe.
According to this configuration, a large amount of water may flow through the branch joint or a pressure applied to the fluid by selecting and using an optimal guide member from among a plurality of guide members having different sizes according to the opening of the main pipe. Even when it is high, the centering can be performed with high accuracy to the hole, so that the waterproofness and the fixability can be secured. In particular, the combination of the inclination member and the guide member enables centering with higher accuracy.

In addition, the branch joint main body includes a hook portion and has a hook member forming a hole through which the guide member is inserted, the guide member includes a flange portion, and the hook member is the flange portion of the guide member and the outer peripheral surface of the main pipe It may be located between
According to this configuration, the gap between the buttocks and the main pipe can be selected by selecting and using an optimal member from among the plurality of wedging members provided with the buttocks having different radii of curvature in accordance with the outer diameter of the main pipe. There is no, it can constitute a branch joint. The branch joint only needs to prepare a plurality of molds for the wedge member, and it is not necessary to prepare a plurality of molds for the tubular member, the outer fixing member and the inner fixing member. That is, the branch joint can cope with the main pipe of various diameters and thicknesses, and the application range to the main pipe can be expanded only by replacing the wedge member.

In addition, the inclined portion of the inclined member may be formed in a spherical shape, and the tip end in contact with the edge of the opening may be smaller than the outer diameter of the guide and the other end may be larger than the opening. Good.
According to this configuration, the branch joint can be accurately attached to the opening of the main pipe by the guide portion and the spherical inclined portion of the inner fixing member. Further, the flange portion in contact with the outer diameter of the main pipe is in close contact with the outer diameter of the main pipe, so that the water resistance and the fixability of the branch joint can be secured.

In addition, the guide portion may include the same diameter portion that maintains the same outer diameter along the longitudinal direction of the cylindrical portion, and the tapered portion that decreases in diameter along the longitudinal direction of the cylindrical portion.
According to this configuration, the tubular member can be guided relative to the aperture when the tubular member is inserted into the aperture.

Moreover, it is good for the guide part and the inclination part of an inclination member not to mutually contact | abut in the state which clamps a main pipe by the collar part and inclination member of a branch coupling main body.
According to this configuration, the branch joint can be retightened as needed.

Moreover, you may have a water stop member which carries out narrow pressure between a collar part and a main pipe.
According to this configuration, the water blocking member (packing) can improve the water blocking property of the branch joint, and adjust the thickness error of the pipe wall of the main pipe to secure the gap between the guide portion and the tip side of the spherical portion. . In addition, the packing can prevent odor leakage and infiltration of unknown water in the drainage pipe.

Moreover, you may form a collar part in the shape which is looser than the outer diameter of a main pipe, and is substantially along the outer diameter of a main pipe.
According to this configuration, even if the size of the main pipe to which the branch joint is attached is changed, the water resistance and the fixability of the branch joint can be secured by closely contacting the outer diameters of the main pipes having different sizes with the same branch joint.

Moreover, the branch joint may form the guide part and the inclination member in the same color.
According to this configuration, the branch joint can prevent a combination error even when combining and using a plurality of types of guide portions and a plurality of types of inclination members in order to ensure high water repellency and fixation. Further, even after the branch joint is fixed to the main pipe, it is possible to visually confirm the combination error from the inside and the outside of the main pipe. In particular, in the case where the fixing member is provided with a recess, visual confirmation from the inside of the main pipe is facilitated.

  Further, the coefficient of thermal expansion of the tubular portion, the collar portion, the guide portion, the inclined member, and the fixing member may be substantially the same, and the looseness of screwing due to thermal contraction may be suppressed. According to this configuration, the coefficient of thermal expansion and the coefficient of thermal contraction are the same, and the branch joint is less likely to loosen due to temperature change.

Alternatively, an external thread may be formed on the outer periphery of the cylindrical portion of the branch joint main body, and an internal thread capable of being screwed with the external thread may be formed on the fixing member.
According to this configuration, the branch joint main body can be inserted into the hole from the outside of the main pipe, and the fixing member can be engaged via the inclined member, and the branch joint can be accurately attached to the hole of the main pipe.

Alternatively, a female screw may be formed on the inner diameter of the cylindrical portion of the branch joint main body, the fixing member may be formed in a cylindrical shape, and an external screw capable of being screwed with the female screw may be formed on the cylindrical outer periphery.
According to this configuration, the fixing member can be inserted into the hole from the inside of the main pipe, the fixing member and the branch joint main body can be engaged via the inclined member, and the branch joint can be attached to the hole of the main pipe with high accuracy.

In addition, a water blocking member may be provided in the radial gap between the branch joint main body and the fixing member.
According to this configuration, the water blocking member can improve the water barrier property and can prevent the odor leak and the entry of unknown water in the drainage pipe.

  Although various embodiments of the present invention have been described above, each configuration and each combination thereof in each embodiment is an example, and addition, omission, replacement of a configuration, and the like without departing from the spirit of the present invention And other modifications are possible. Further, the present invention is not limited by the embodiments.

  The present invention can be applied to a branch joint connecting a main pipe and a sub pipe.

1: Latent heat recovery type gas water heater, 2: water heater main body, 16: drain, 18: drain discharge pipe, 20: secondary pipe (drain drainage branch), 22, 22A, 22B: main pipe (soiled water mass), 25, 25A , 25B, 25C, 25D, 25E, 25F: aperture, 25a: edge, 26A, 26B, 26C, 26D, 26E, 26F: contact portion, 30, 80: branch joint, 31, 81: main body (branch joint main body , 32, 82: tubular member, 32a, 82a: insertion tube portion, 32b, 82b: outer tube portion, 33, 62, 89: flange portion, 33b, 43, 83, 93: rotation applying portion, 34, 44 , 64, 74, 84, 94: through hole, 35, 97: step portion, 56, 57, 58, 59: packing (water stopping member), 36, 86: tubular portion, 37: locking portion (male thread) , 41, 91: fixing member, 72: spherical portion (inclined portion), 2a: tip portion (tip end side), 72b: root portion (other end side), 46, 66: engaging portion (female screw), 51: hole saw, 52, 52A, 52B, 52C: wedge member, 52a, 52Aa, 52Ba , 52Ca: collar portion, 54: hole, 55: flat portion, 61, 61A, 61B, 61C: guide member, 61a, 90: guide portion, 62b: locking surface, 68, 68A, 68B, 68C: uniform diameter portion , 69: tapered portion 71, 71A, 71B, 71C: inclined member, 72: spherical portion, 75: protrusion, 85: groove, 87: locking portion (female screw), 88, 98: sliding surface, 95: Cylindrical part, 96: Engaging part (male thread)

Claims (11)

A bifurcated joint attached to a hole drilled in a main pipe and connecting the sub pipe to form a branch passage,
A branch including a cylindrical portion inserted from the outside into the opening of the main pipe, a flange portion provided on the outer periphery of the cylindrical portion, and a guide portion guiding the cylindrical portion within the opening to connect the sub-pipe Fitting body,
A fixing member screwed from the inside of the main pipe to the cylindrical portion of the branch joint main body;
The edge of the opening is provided with an inclined portion that abuts from the inside of the main pipe, and has an inclined member located between the fixing member and the main pipe,
Sandwiching the main pipe between the flange portion of the branch joint body and the inclined member ;
The branch joint body is
A tubular member comprising the tubular portion;
And a guide member having the guide portion and forming a hole through which the tubular member is inserted,
The branch joint according to claim 1 , wherein the tubular member includes a flange portion, and the guide member is located between the flange portion and an outer peripheral surface of the main pipe . The branch joint body is
It has a weir member provided with the weir and forming a hole through which the guide member passes,
The guide member comprises a flange portion;
The branch joint according to claim 1 , wherein the wedge member is located between the flange portion of the guide member and the outer peripheral surface of the main pipe. The inclined portion of the inclined member is formed in a spherical shape, and the tip end contacting the edge of the hole is formed smaller in diameter than the outer diameter of the guide portion, and the other end is formed larger in diameter than the hole. The branch joint according to any one of claims 1 or 2 . The guide portion has a constant diameter portion to maintain the same outer diameter along the longitudinal direction of the tubular portion of claim 1 to 3 and a tapered portion which decreases in diameter along the longitudinal direction of the tubular portion The branch joint according to any one of the above. Wherein the guide portion and the inclined portion of the inclined member, the main pipe in a state of sandwiching with the inclined member and the flange portion of the branch joint body, any one of claim 1 to 4 do not abut against each other Branch fitting as described in. The branch joint according to any one of claims 1 to 5 , further comprising a water blocking member that narrows pressure between the flange portion and the main pipe. The branch joint according to any one of claims 1 to 6 , wherein the flange portion is formed in a shape having a diameter smaller than the outer diameter of the main pipe and substantially following the outer diameter of the main pipe. The branch joint according to any one of claims 1 to 7 , wherein the guide portion and the inclined member are formed in the same color. The branch joint according to any one of claims 1 to 8 , wherein an external thread is formed on an outer periphery of the cylindrical portion of the branch joint main body, and a female thread capable of being screwed with the external thread is formed on the fixing member. The female screw is formed on the inner diameter of the cylindrical portion of the branch joint main body, the fixing member is formed in a cylindrical shape, and the cylindrical outer periphery is formed with an external screw capable of being screwed with the female screw. The branch joint according to any one of 8 . The branch joint according to claim 10 , wherein a water blocking member is provided in a radial gap between the branch joint main body and the fixing member.

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