JP7469352B2 - Collector Pipe Joint - Google Patents

Description

The present invention relates to a manifold joint.

Conventionally, sound insulation covers such as that shown in Patent Document 1 below are known. This sound insulation cover covers a collecting pipe joint. The collecting pipe joint has a vertical pipe connection part that can be connected to a vertical pipe, and a horizontal pipe connection part that protrudes from the side of the vertical pipe connection part and can be connected to a horizontal pipe. The sound insulation cover is also divided at the center in the vertical direction of the horizontal pipe connection part.

Patent No. 5771514

However, because the conventional soundproofing cover is divided at the center in the vertical direction of the horizontal pipe connection part, it was necessary to prepare multiple dies required for manufacturing depending on the diameter and number of ports of the horizontal pipe connection part. This resulted in high investment costs for the dies and required work to connect the divided parts using tape, etc., resulting in poor productivity.

The present invention was made in consideration of the above-mentioned circumstances, and aims to provide a soundproofing cover that can ensure productivity and can be easily attached to a manifold joint.

In order to solve the above problems, the present invention proposes the following means.
The sound-insulating cover of the present invention is a sound-insulating cover that covers a collecting pipe joint that includes an upper connecting pipe having a vertical pipe connection portion connectable to a vertical pipe and a horizontal pipe connection portion protruding from the side of the vertical pipe connection portion and connectable to a horizontal pipe, and a lower connecting pipe connected below the upper connecting pipe, and is characterized in that it comprises an upper sound-insulating cover that is flexible and wrapped around the upper connecting pipe from the outside in the radial direction, and a lower sound-insulating cover that is tubular and through which the lower connecting pipe is inserted.

According to this invention, the sound insulation cover is provided with an upper sound insulation cover that is wrapped around the upper connecting pipe from the outside in the radial direction, so that the outer surface of the upper connecting pipe, which has a vertical pipe connection section and a horizontal pipe connection section and is prone to have a complex structure, can be covered with a simple configuration. In addition, since the sound insulation cover is provided with a lower sound insulation cover through which the lower connecting pipe is inserted, the work of covering the outer surface of the lower connecting pipe with the sound insulation cover can be easily performed. As a result, the productivity of the sound insulation cover can be ensured, and it can be easily attached to the collecting pipe joint.

The covered manifold of the present invention is a manifold with a cover that includes the above-mentioned soundproof cover and the manifold, and is characterized in that a first engagement portion is formed on the lower connecting pipe, and a second engagement portion is formed on the lower soundproof cover that axially engages with the first engagement portion to prevent the lower soundproof cover from slipping out downward, and the first engagement portion and the second engagement portion engage with each other in the axial direction when their circumferential positions match, and are disengaged when their circumferential positions differ from each other.

According to this invention, the lower connecting pipe is formed with a first engagement portion, and the lower sound insulating cover is formed with a second engagement portion that engages with the first engagement portion in the axial direction to prevent the lower sound insulating cover from slipping out downward. Therefore, by making the circumferential positions of the first engagement portion and the second engagement portion different from each other, the first engagement portion of the lower connecting pipe can pass the inside of the sound insulating cover from above to below.
Furthermore, by aligning the circumferential positions of the first engaging portion and the second engaging portion, it is possible to prevent the lower sound-proof cover from coming off downward from the lower connecting pipe.

In addition, a cushioning material having a lower hardness than the lower connecting pipe may be disposed at the portion of the first engaging portion that abuts against the second engaging portion.

In this case, a shock absorbing material is placed in the first engagement section, so when the collecting pipe joint vibrates due to the influence of running water inside, the vibration can be absorbed by the shock absorbing material. This makes it possible to prevent the lower sound insulation cover from shifting out of position relative to the lower connecting pipe.

The present invention ensures productivity and allows easy installation on the manifold joint.

FIG. 2 is a front view of the collecting pipe joint according to the first embodiment of the present invention. FIG. 2 is a front view showing a covered collecting pipe joint including the collecting pipe joint shown in FIG. 1 . FIG. 3 is a top view of the covered collecting pipe joint shown in FIG. 2 . FIG. 3 is a rear view of an upper connecting pipe of the covered collecting pipe joint shown in FIG. 2 . 3 is a perspective view showing a state before an upper sound insulating cover is attached to the sound insulating cover shown in FIG. 2. [0023] FIG. FIG. 6 is a front view of the upper sound insulating cover shown in FIG. 5 . FIG. 6 is a top view of the upper sound insulating cover shown in FIG. 5 . FIG. 6 is a side view of the upper sound insulating cover shown in FIG. 5 . 2 is a front view showing a state in which an upper connecting pipe and a lower connecting pipe are separated from each other in the collecting pipe joint shown in FIG. 1 . 10 is a diagram showing a state in which a lower connecting pipe of the collecting pipe joint shown in FIG. 9 is inserted into a lower sound insulating cover. FIG. 11 is a diagram showing a state in which a lower connecting pipe and an upper connecting pipe of the collecting pipe joint shown in FIG. 10 are connected to each other. FIG. 12 is a diagram showing a state in which an upper sound insulating cover is attached to an upper connecting pipe of the collecting pipe joint shown in FIG. 11 . 6 is a cross-sectional view taken along the horizontal direction, showing a modified example of the upper sound-insulating cover shown in FIG. 5 . FIG. 14 is a top view of the upper sound-insulating cover shown in FIG. 13 attached to the collecting pipe joint. FIG. 6 is a partial front view of a covered manifold according to a second embodiment of the present invention. FIG. 16 is a cross-sectional view of the lower sound-insulating cover shown in FIG. 15 . FIG. 16 is a cross-sectional view of the lower connecting pipe shown in FIG. 15 . FIG. 11 is a perspective view of a lower sound insulation cover according to a third embodiment of the present invention. FIG. 13 is a front view of a lower collecting pipe according to a third embodiment of the present invention. FIG. 11 is a partial vertical cross-sectional view of a covered collecting pipe joint according to a third embodiment of the present invention. FIG. 13 is a front view of a lower collecting pipe according to a fourth embodiment of the present invention. FIG. 10 is a partial vertical cross-sectional view of a covered collecting pipe joint according to a fourth embodiment of the present invention. FIG. 13 is a partial vertical cross-sectional view of a covered collecting pipe joint according to a fifth embodiment of the present invention.

First Embodiment
A covered manifold 1 according to a first embodiment of the present invention will be described below with reference to Figures 1 to 14. Note that the drawings used in the following description are schematic, and the ratios of length, width, thickness, and the like are not necessarily the same as those in the actual embodiment, and can be changed as appropriate.

As shown in FIGS. 1 and 2 , a covered collecting pipe joint 1 according to this embodiment includes a collecting pipe joint 10 and a sound insulating cover 20 that covers the collecting pipe joint 10 .
The collecting pipe joint 10 includes an upper connecting pipe 11 and a lower connecting pipe 12 connected to the upper connecting pipe 11. The upper connecting pipe 11 has a vertical pipe connecting portion 13 connectable to a first vertical pipe P1, and a horizontal pipe connecting portion 14 protruding from a side surface of the vertical pipe connecting portion 13 and connectable to a horizontal pipe P3. The first vertical pipe P1 is connected to the upper end portion of the upper connecting pipe 11.

In the following description, the direction along the central axis O of the vertical pipe connection part 13 is referred to as the axial direction, the upper connecting pipe 11 side of the vertical pipe connection part 13 along the axial direction is referred to as the upper side, and the lower connecting pipe 12 side is referred to as the lower side. In addition, in a plan view seen from the axial direction, the direction perpendicular to the central axis O is referred to as the radial direction, and the direction going around the central axis O in a plan view seen from the axial direction is referred to as the circumferential direction.

3, the horizontal pipe connecting portion 14 extends radially outward from the peripheral wall of the vertical pipe connecting portion 13. In the illustrated example, three horizontal pipe connecting portions 14 are disposed.
Two of the three horizontal pipe connecting parts 14 are disposed at positions on either side of the central axis O in the radial direction. The remaining horizontal pipe connecting parts 14 extend in a radial direction that forms an angle of 90° in a top view with the directions in which the two horizontal pipe connecting parts 14 extend. However, this is not limited to this embodiment, and the number and extending directions of the horizontal pipe connecting parts 14 can be changed as desired.
1, a connecting ring 15 to which each of the horizontal pipes P3 is connected is attached to the radially outer end of the horizontal pipe connecting portion 14. The outer diameter of the connecting ring 15 is larger than the outer diameter of the horizontal pipe connecting portion 14.

The upper connecting pipe 11 and the lower connecting pipe 12 in the collecting pipe joint 10 may be made transparent. This allows the connection state of the upper connecting pipe 11 and the lower connecting pipe 12 to be visually confirmed. In addition, a flame retardant such as non-thermally expandable graphite or magnesium hydroxide may be added.

The lower connecting pipe 12 is tubular and has a smaller diameter below than above. The lower connecting pipe 12 is provided with a connecting pipe section 16 located at the upper end and connected to the lower side of the upper connecting pipe 11, an inclined pipe section 17 connected to the lower side of the connecting pipe section 16 and gradually reducing in diameter as it extends downward, and a lower pipe section 18 connected to the lower end of the inclined pipe section 17 and to which the second vertical pipe P2 is connected. The connecting pipe section 16, the inclined pipe section 17, and the lower pipe section 18 are integrally formed, for example, by injection molding of a synthetic resin material.

The outer diameter of the connecting pipe portion 16 is smaller than the outer diameter of the vertical pipe connecting portion 13 of the upper connecting pipe 11. The peripheral wall of the connecting pipe portion 16 is fitted into the inside of the vertical pipe connecting portion 13. The outer diameter of the upper end portion of the inclined pipe portion 17 is larger than the outer diameter of the connecting pipe portion 16.
The outer diameter of the lower end of the inclined pipe portion 17 is smaller than the outer diameter of the connecting pipe portion 16. The axial size of the inclined pipe portion 17 is larger than the axial size of the connecting pipe portion 16.

The connecting pipe portion 16 contains a resin composition containing a polyvinyl chloride resin and thermally expandable graphite. That is, the connecting pipe portion 16 is produced by molding the resin composition. Usually, the connecting pipe portion 16 is produced by extrusion molding the resin composition.
The connecting pipe part 16 may have a single-layer structure in which the entire connecting pipe part 16 is made of a resin composition, or may have a multi-layer structure made of multiple layers. In the case of a multi-layer structure, any one of the layers may be formed from a resin composition. For example, when the connecting pipe part 16 has a three-layer structure consisting of a surface layer, an intermediate layer, and an inner layer, the intermediate layer may be formed from a resin composition, and the surface layer, the intermediate layer, and the inner layer may contain the heat absorbing agent.

The intermediate layer is black in color because it contains thermally expandable graphite, so it is preferable that the surface layer and the inner layer contain a colorant other than black so that they can be distinguished from the intermediate layer.
The thickness of the surface layer and the inner layer is preferably 0.3 mm to 3.0 mm, and more preferably 0.6 mm to 1.5 mm. If the thickness of the coating layer is 0.3 mm or more, the mechanical strength of the pipe can be sufficiently ensured, and if it is 3.0 mm or less, the decrease in fire resistance can be suppressed.
Moreover, it is preferable that the connection pipe portion 16 satisfies the performance requirements set forth in JIS K6741.

The outer diameter of the lower pipe section 18 is smaller than the outer diameter of the connecting pipe section 16 and larger than the outer diameter of the lower end of the inclined pipe section 17. The axial size of the lower pipe section 18 is smaller than the axial size of the connecting pipe section 16. The second vertical pipe P2 is fitted from below into the inside of the lower pipe section 18, thereby connecting the second vertical pipe P2 to the lower connecting pipe 12.

As shown in Figure 2, the sound-proof cover 20 of this embodiment is provided with an upper sound-proof cover 21 that is flexible and is wrapped around the upper connecting pipe 11 from the outside in the radial direction, and a lower sound-proof cover 22 that is tubular and through which the lower connecting pipe 12 is inserted.
The upper sound insulating cover 21 and the lower sound insulating cover 22 are formed into a sheet shape from an elastic material such as modified asphalt, elastomer, rubber, polyolefin resin, soft polyvinyl chloride resin, or the like.

The upper sound-insulating cover 21 and the lower sound-insulating cover 22 may contain inorganic materials such as calcium carbonate or barium sulfate, metal sheets such as iron or lead, or metal powder. The thickness is preferably 1.0 mm or more and 5.0 mm or less, and more preferably 1.5 mm or more and 4.0 mm or less. Furthermore, a surface material such as synthetic fiber nonwoven fabric or glass fiber nonwoven fabric may be laminated on one or both sides of the upper sound-insulating cover 21 and the lower sound-insulating cover 22.

5 to 8, the upper sound-insulating cover 21 has a sound-insulating cover main body 21A that is a rectangular strip that is longer in the horizontal direction than in the vertical direction when viewed from the front. The sound-insulating cover main body 21A is attached to the upper connecting pipe 11 so that the vertical direction coincides with the axial direction of the collecting pipe joint 10.
The upper sound-insulating cover 21 has a raised portion 23 having a fitting opening 24 into which the horizontal pipe connection portion 14 is fitted. The raised portion 23 is disposed in the axial center of the sound-insulating cover body 21A, and a plurality of raised portions 23 are disposed at intervals in the horizontal direction. In the illustrated example, three raised portions 23 are disposed.

The raised portion 23 is raised toward one side in the thickness direction toward which the front and back surfaces of the upper sound-insulating cover 21 face. The raised portion 23 is raised from the surface of the front and back surfaces of the sound-insulating cover main body 21A opposite to the surface that abuts against the outer peripheral surface of the collecting pipe joint 10. Each of the multiple raised portions 23 is substantially circular in a plan view, and the horizontal middle portions are connected to each other.
The raised portion 23 extends gradually toward the one side toward the center in a plan view. The fitting opening 24 is formed at an end of the raised portion 23 on the one side.

The fitting openings 24 are each disposed at the horizontal center of each of the plurality of raised portions 23. The fitting openings 24 are elliptical in a front view, with the long axis direction coinciding with the vertical direction and the short axis direction coinciding with the horizontal direction.
The fitting opening 24 is expanded laterally to assume a perfect circular shape by inserting the horizontal pipe connecting portion 14. The shape of the fitting opening 24 is not limited to this, and may be, for example, an elliptical shape, a diamond shape, or the like.

As shown in Figures 3 and 4, both lateral ends of the upper sound insulation cover 21 are connected to each other at the side of the vertical pipe connection part 13 where the horizontal pipe connection part 14 is not protruding. Both lateral ends of the upper sound insulation cover 21 are connected to each other with an adhesive or the like in a state where they are overlapped with each other in the radial direction. Note that instead of adhesive, the both ends of the upper sound insulation cover 21 may be connected to each other with an adhesive tape such as a butyl rubber tape that has adhesiveness and water-stopping properties. Also, the both ends may be removably connected by fasteners or hook-and-loop fasteners provided at both ends.

3, the upper sound-insulating cover 21 is disposed along the outer diameter of the upper connecting pipe 11 and the horizontal pipe connecting portion 14. A gap CL that serves as a sound-insulating layer is formed between the inner surface of the raised portion 23 and the outer surface of the collecting pipe joint 10.
On the other hand, no gap is generated around the fitting opening 24 in the upper sound-insulating cover 21. This is because the horizontal pipe connecting portion 14 is inserted into the fitting opening 24 while the upper sound-insulating cover 21 is elastically deformed so that the fitting opening 24 expands, and therefore the inner peripheral edge of the fitting opening 24 is in close contact with the outer peripheral surface of the horizontal pipe connecting portion 14 due to the elastic restoring force of the upper sound-insulating cover 21.

As shown in FIG. 2, the outer diameter of the upper side of the lower sound-insulating cover 22 is uniform throughout the entire axial direction. The outer diameter of the lower side of the lower sound-insulating cover 22 gradually decreases toward the bottom. The upper end of the lower sound-insulating cover 22 covers the lower end of the upper connecting pipe 11.

The upper end of the lower sound-insulating cover 22 is covered from the radial outside by the upper sound-insulating cover 21. The axial position of the lower end of the lower sound-insulating cover 22 coincides with the axial position of the middle part of the lower tube section 18 in the axial direction. In other words, the lower end of the lower tube section 18 is not covered by the lower sound-insulating cover 22 and is exposed to the outside.

Next, a method of attaching the sound insulating cover 20 to the collecting pipe joint 10 will be described.
As shown in Fig. 9, the collecting pipe joint 10 is formed so that the upper connecting pipe 11 and the lower connecting pipe 12 can be separated. With the upper connecting pipe 11 and the lower connecting pipe 12 separated, the lower connecting pipe 12 is inserted into the lower sound insulating cover 22 as shown in Fig. 10. At this time, the lower connecting pipe 12 is inserted into the inside of the lower sound insulating cover 22 from above the lower sound insulating cover 22.

Next, as shown in FIG. 11, the connecting pipe section 16 of the lower connecting pipe 12 is inserted into and fitted to the lower end opening of the vertical pipe connecting section 13 of the upper connecting pipe 11. This results in the upper end section of the lower sound insulating cover 22 covering the lower end section of the upper connecting pipe 11 from the outside in the radial direction. At this time, the connecting ring 15 is not attached to the horizontal pipe connecting section 14 of the upper connecting pipe 11.

12, the upper sound-insulating cover 21 is wrapped around the upper connecting pipe 11 from the outside in the radial direction. At this time, the fitting openings 24 of the upper sound-insulating cover 21 are expanded laterally to elastically deform the upper sound-insulating cover 21, while the horizontal pipe connecting parts 14 are fitted into the fitting openings 24 separately. In this way, the upper sound-insulating cover 21 is fixed to the upper connecting pipe 11.
Finally, the connection ring 15 is attached to the radially outer end of the horizontal pipe connection part 14. The horizontal pipe connection part 14 is inserted into the inside of the connection ring 15 and fitted together, whereby the connection ring 15 is fixed to the horizontal pipe connection part 14.

Next, modified examples of the upper sound insulating cover 21 will be described.
13, the raised portion 23 of the upper sound-proof cover 21 according to this modification is connected to one end in the thickness direction and has a recess 27 recessed toward the other side. The fitting openings 24 are each disposed at the center of the recess 27 in the lateral direction.
As shown in FIG. 14 , a gap CL is formed between the horizontal pipe connecting portions 14 adjacent to each other in a top view on the radially inner side of the upper sound-proof cover 21 .

As described above, according to the sound insulation cover 20 and covered manifold joint 1 of this embodiment, the sound insulation cover 20 is provided with an upper sound insulation cover 21 that is wrapped around the upper connecting pipe 11 from the outside in the radial direction. Therefore, the outer surface of the upper connecting pipe 11, which has a vertical pipe connecting portion 13 and a horizontal pipe connecting portion 14 and is prone to having a complex structure, can be covered with a simple configuration.

In addition, since the sound insulation cover 20 includes a lower sound insulation cover 22 through which the lower connecting pipe 12 is inserted, the outer surface of the lower connecting pipe 12 can be easily covered with the sound insulation cover 20. As a result, the productivity of the sound insulation cover 20 can be ensured, and it can be easily attached to the collecting pipe joint 10.

In addition, the sound-insulating cover 20 that is wrapped around the collecting pipe joint 10 from the outside in the radial direction is provided with a raised portion 23 in which a fitting opening 24 is formed. Therefore, when the collecting pipe joint 10 is covered with the sound-insulating cover 20, a sound-insulating layer is formed between the inner surface of the raised portion 23 and the outer surface of the collecting pipe joint 10. This makes it possible to easily ensure a sound-insulating layer between the sound-insulating cover 20 and the collecting pipe joint 10.
Furthermore, since the fitting opening 24 of the flexible sound-proof cover 20 is fitted and fixed into the horizontal pipe connection portion 14 of the collecting pipe joint 10, gaps are less likely to occur around the fitting opening 24 through which the horizontal pipe connection portion 14 is inserted.

Furthermore, since the horizontal pipe connection portion 14 is inserted into the fitting opening 24 while the fitting opening 24 of the sound insulation cover 20 is being deformed, the occurrence of gaps around the fitting opening 24 can be reliably prevented.
In addition, both lateral ends of the sound insulation cover 20 are connected to each other at a portion of the side surface of the vertical pipe connection portion 13 where the horizontal pipe connection portion 14 is not protruding. Therefore, for example, the sound insulation cover 20 can be attached more firmly to the collecting pipe joint 10 compared to a configuration in which both lateral ends of the sound insulation cover 20 are connected to each other around the horizontal pipe connection portion 14.

Second Embodiment
Next, a covered manifold 2 according to a second embodiment of the present invention will be described with reference to Figures 15 to 17. In the following embodiments, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof will be omitted. Only the differences will be described.

15 , the lower connecting pipe 12 of the collecting pipe joint 10 according to this embodiment is formed with a first engaging portion 19. The first engaging portion 19 is disposed on the outer circumferential surface of the lower pipe portion 18 of the lower connecting pipe 12.
17 , the first engagement portion 19 has a triangular shape in a cross section and protrudes radially outward. A plurality of first engagement portions 19 are arranged at intervals in the circumferential direction. In the illustrated example, three first engagement portions 19 are arranged at equal intervals from each other in the circumferential direction.

As shown in FIG. 15, in this embodiment, the lower sound insulation cover 22 is formed with a second engagement portion 28 that axially engages with the first engagement portion 19 to prevent the lower sound insulation cover 22 from slipping out downward. The second engagement portion 28 is formed at the lower end of the lower sound insulation cover 22.

The first engagement portion 19 and the second engagement portion 28 are engaged with each other in the axial direction when their circumferential positions match, and are disengaged when their circumferential positions differ from each other. This point will be described in detail below.
A clearance portion 29 is formed at the lower end portion of the lower sound insulating cover 22, allowing the first engagement portion 19 of the lower connecting pipe 12 to pass through. The clearance portion 29 has a triangular shape in cross section, and protrudes radially outward.

The shape of the clearance portion 29 in cross section is the same as the shape of the first engagement portion 19 in cross section. The size of the clearance portion 29 in cross section is larger than the size of the first engagement portion 19. A plurality of clearance portions 29 are arranged at intervals in the circumferential direction. In the illustrated example, three clearance portions 29 are arranged, and are equally spaced from each other in the circumferential direction.

The recess 29 extends downward from the axial middle of the lower sound-insulating cover 22. The amount by which the recess 29 protrudes radially outward from the outer surface of the lower sound-insulating cover 22 gradually increases as the outer diameter of the lower sound-insulating cover 22 decreases downward.

The recess 29 has a triangular shape that is longer in the axial direction than in the circumferential direction when viewed from the front. The circumferential size of the recess 29 gradually increases downward.
That is, the lower edge of the lower sound-proof cover 22 excluding the recess 29 serves as a second engagement portion 28 that engages with the first engagement portion 19 in the axial direction.

When inserting the lower connecting pipe 12 into the lower sound insulation cover 22, the lower connecting pipe 12 is inserted inside the lower sound insulation cover 22 with the circumferential positions of the escape portion 29 and the first engagement portion 19 aligned. As a result, the first engagement portion 19 is exposed below the sound insulation cover 20 through the escape portion 29. At this time, the entire first engagement portion 19 is exposed below the sound insulation cover 20.

The lower connecting pipe 12 and the lower sound insulating cover 22 are rotated relative to each other in the circumferential direction, and the lower sound insulating cover 22 covers the outer surface of the lower connecting pipe 12 in a state in which the circumferential positions of the relief portion 29 and the first engaging portion 19 are made different from each other. In other words, the circumferential positions of the first engaging portion 19 and the second engaging portion 28 are aligned with each other.
The second engagement portion 28 of the lower sound insulating cover 22 is placed above the recess 29. Therefore, the lower sound insulating cover 22 will not come off downward from the lower connecting pipe 12.

A cushioning material 40 having a lower hardness than the lower connection pipe 12 is disposed at the portion of the first engagement part 19 that abuts against the second engagement part 28. The cushioning material 40 can be disposed, for example, on the upper surface of the first engagement part 19. The cushioning material 40 is preferably a resin material having elasticity, such as an elastomer material or a rubber material.

As described above, according to the covered manifold 2 of this embodiment, the first engagement portion 19 is formed on the lower connecting pipe 12, and the second engagement portion 28 is formed on the lower sound insulating cover 22, which axially engages with the first engagement portion 19 to prevent the lower sound insulating cover 22 from slipping out downward. Therefore, by making the circumferential positions of the first engagement portion 19 and the second engagement portion 28 different from each other, the first engagement portion 19 of the lower connecting pipe 12 can pass inside the sound insulating cover 20 from above to below.

Furthermore, by aligning the circumferential positions of the first engagement portion 19 and the second engagement portion 28 with each other, the lower sound-proof cover 22 can be prevented from coming off downward from the lower connecting pipe 12 .
In addition, since the buffer material 40 is disposed in the first engagement portion 19, when the collecting pipe joint 10 vibrates due to the effect of running water inside, the vibration can be absorbed by the buffer material 40. This makes it possible to prevent the position of the lower sound-proof cover 22 with respect to the lower connecting pipe 12 from shifting.

Third Embodiment
Next, a covered manifold 3 according to a third embodiment of the present invention will be described with reference to Figures 18 to 20. In the following embodiments, the same components as those in the second embodiment are given the same reference numerals, and the description thereof will be omitted. Only the differences will be described.

18, in the lower sound-insulating cover 22 of the sound-insulating cover 20 according to this embodiment, the shape of the second engagement portion 28B is different from that of the second embodiment. That is, the second engagement portion 28B is disposed at the lower end of the inner circumferential surface of the lower sound-insulating cover 22 and protrudes radially inward.
The second engagement portions 28B are individually disposed on the inner circumferential surface of the lower sound insulation cover 22 at positions radially sandwiching the central axis O. The second engagement portions 28B have an angular shape in a top view.

In addition, in the lower connecting pipe 12 according to this embodiment, the shape of the first engagement portion 19B is different from that of the second embodiment. The first engagement portion 19B is formed on the outer peripheral surface of the lower pipe portion 18, and has a groove shape recessed radially inward. The first engagement portion 19B opens downward from the lower end edge of the lower pipe portion 18 and extends upward. The upper end portion of the first engagement portion 19B extends along the circumferential direction. The first engagement portions 19B are individually arranged on the outer peripheral surface of the lower pipe portion 18 at positions that sandwich the central axis O in the radial direction.

When inserting the lower connecting pipe 12 into the lower sound insulating cover 22, the second engaging portion 28B of the lower sound insulating cover 22 is inserted into the first engaging portion 19B. Then, the lower connecting pipe 12 and the lower sound insulating cover 22 are rotated relative to each other in the circumferential direction, thereby engaging the second engaging portion 28B with the first engaging portion 19B in the axial direction. This makes it possible to prevent the lower sound insulating cover 22 from coming off downward from the lower connecting pipe 12, as shown in FIG. 20.

Fourth Embodiment
Next, a covered collecting pipe joint 4 according to a fourth embodiment of the present invention will be described with reference to Figures 21 and 22. In the following embodiments, the same components as those in the second embodiment are given the same reference numerals, and the description thereof will be omitted, and only the differences will be described.

As shown in FIG. 21, the lower edge of the lower sound insulating cover 22 in the covered manifold 4 according to this embodiment is the second engagement portion 28C. The first engagement portion 19C is disposed on the lower edge of the lower connecting pipe 12. The first engagement portion 19C protrudes radially outward from the lower edge of the lower pipe portion 18 in the lower connecting pipe 12. The first engagement portion 19C extends around the entire circumference of the lower edge of the lower pipe portion 18. The first engagement portions 19C may be provided intermittently at intervals in the circumferential direction on the lower edge of the lower pipe portion 18.

When the lower connecting pipe 12 is inserted into the lower sound insulating cover 22, the lower end of the lower sound insulating cover 22 is deformed radially outward, while the first engaging portion 19C is exposed downward from the lower edge of the lower sound insulating cover 22. As a result, as shown in FIG. 22, the second engaging portion 28C engages with the first engaging portion 19C in the axial direction, preventing the lower sound insulating cover 22 from slipping out downward from the lower connecting pipe 12.

Fifth Embodiment
Next, a covered manifold 5 according to a fifth embodiment of the present invention will be described with reference to Fig. 23. In the following embodiments, the same components as those in the first embodiment are given the same reference numerals, and the description thereof will be omitted. Only the differences will be described.

23 , in the covered collecting pipe joint 5 according to this embodiment, a foam tape 30 is wrapped around the portion of the lower end of the lower connecting pipe 12 that is located below the lower sound-insulating cover 22. This makes it possible to prevent the lower sound-insulating cover 22 from coming off downward from the lower connecting pipe 12, and also to reliably prevent sound leakage from a gap between the lower sound-insulating cover 22 and the lower end of the lower connecting pipe 12.
In addition, an adhesive tape 31 is wound around the lower end of the lower sound-insulating cover 22 and the foam tape 30. This makes it possible to firmly fix the positions of the lower sound-insulating cover 22 and the foam tape 30.

The technical scope of the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.

For example, in each of the above embodiments, the sound insulation cover 20 is configured to have a rectangular band shape that is longer in the horizontal direction than in the vertical direction when viewed from the front, but is not limited to this configuration. The shape of the sound insulation cover 20 when viewed from the front can be changed as desired.

In addition, in each of the above-described embodiments, the fitting opening 24 is longer in the vertical direction than in the horizontal direction when viewed from the front, but this is not limited to this. The shape of the fitting opening 24 can be changed as desired.
In addition, the fitting opening 24 is expanded laterally to assume a circular shape by inserting the horizontal pipe connecting portion 14 therethrough in the above embodiment, but the present invention is not limited to this. The fitting opening 24 may assume a circular shape before the horizontal pipe connecting portion 14 is inserted therethrough.

In addition, in each of the above embodiments, the two lateral ends of the sound insulation cover 20 are connected to each other at a portion of the side of the vertical pipe connection portion 13 where the horizontal pipe connection portion 14 is not protruding, but this is not limited to the above embodiment. The two lateral ends of the sound insulation cover 20 may be connected to each other around the horizontal pipe connection portion 14 on the side of the vertical pipe connection portion 13.

In addition, in each of the above embodiments, the method of attaching the sound insulating cover 20 to the collecting pipe joint 10 has been described as attaching the lower sound insulating cover 22 to the lower connecting pipe 12, and then attaching the upper sound insulating cover 21 to the upper connecting pipe 11 connected to the lower connecting pipe 12. However, the method is not limited to this. The upper connecting pipe 11 and the lower connecting pipe 12 may be connected first, and then the lower sound insulating cover 22 may be attached to the lower connecting pipe 12, and further the upper sound insulating cover 21 may be attached to the upper connecting pipe 11.
In addition, for example, an inorganic fiber layer such as glass wool or rock wool having sound absorbing or vibration absorbing properties may be provided between the sound insulating cover 20 and the collecting pipe joint 10.

In addition, the components in the above embodiment may be replaced with well-known components as appropriate without departing from the spirit of the present invention, and the above-mentioned modifications may be combined as appropriate.

REFERENCE SIGNS LIST 1, 2, 3, 4, 5 Collector pipe joint with cover 10 Collector pipe joint 11 Upper connecting pipe 12 Lower connecting pipe 13 Vertical pipe connecting portion 14 Horizontal pipe connecting portion 19, 19B, 19C First engaging portion 20 Sound insulating cover 21 Upper sound insulating cover 22 Lower sound insulating cover 23 Raised portion 24 Fitting opening 28, 28B, 28C Second engaging portion 40 Cushioning material

Claims (4)

A collecting pipe joint comprising: a sound insulating cover; an upper connecting pipe having a vertical pipe connecting portion connectable to a vertical pipe; and a horizontal pipe connecting portion protruding from a side surface of the vertical pipe connecting portion and connectable to a horizontal pipe; and a lower connecting pipe connected below the upper connecting pipe,
the sound-insulating cover is flexible and includes an upper sound-insulating cover wrapped around the upper connecting pipe from the outside in the radial direction, and a lower sound-insulating cover having a tubular shape and covering the lower connecting pipe,
The upper sound-insulating cover is connected to both lateral ends of the upper connecting pipe by tape on a side surface of the upper connecting pipe on which the lateral pipe connecting portion is not protruding,
the upper sound-insulating cover has a fitting opening through which the horizontal pipe connecting portion is inserted,
The fitting opening is formed at a distance from a lower end of the upper sound-insulating cover,
The upper connection pipe below the horizontal pipe connection portion is covered by the upper sound-insulating cover below the fitting opening.
Collector pipe fitting. The collecting pipe joint according to claim 1 , wherein a lower end of the upper sound-insulating cover is located above a lower end of the upper connecting pipe. the lower connecting pipe includes a connecting pipe portion connected to a lower portion of the upper connecting pipe, and an inclined pipe portion connected to a lower portion of the connecting pipe portion and having a diameter that decreases downward,
The collecting pipe joint according to claim 1 or 2 , wherein the connecting pipe portion contains a resin composition containing a polyvinyl chloride resin and thermally expandable graphite. The collecting pipe joint according to claim 1 , wherein at least one of the upper sound-insulating cover and the lower sound-insulating cover contains a metal sheet.

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