Manifold pipe joint, method for manufacturing manifold pipe joint

Abstract

To provide a sound insulation cover that can be easily attached to a collecting pipe joint while ensuring productivity.SOLUTION: A sound insulation cover 20 that covers a collecting pipe joint 10 comprises: an upper connecting pipe 11 having a vertical pipe connecting part 13 that can be connected to a vertical pipe and a horizontal pipe connecting part 14 that is projected from a side surface of the vertical pipe connecting part 13 and can connect a horizontal pipe; and a lower connecting pipe 12 connected below the upper connecting pipe 11, wherein the sound insulation cover comprises: an upper sound insulation cover 21 having flexibility and wound around the upper connection pipe 11 from the outside in a radial direction; and a lower sound insulation cover 22 formed in tubular shape, into which the lower connecting pipe 12 is inserted.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a collecting pipe joint.

Background Art

[0002] Conventionally, a sound insulation cover as shown in Patent Document 1 below, for example, is known. This sound insulation cover covers a collecting pipe joint. The collecting pipe joint includes a vertical pipe connection part that can be connected to a vertical pipe, and a horizontal pipe connection part that projects from the side surface of the vertical pipe connection part and can be connected to a horizontal pipe. The sound insulation cover is divided at the central part in the vertical direction of the horizontal pipe connection part.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, since the conventional sound insulation cover is divided at the central part in the vertical direction of the horizontal pipe connection part, it is necessary to prepare a plurality of molds required for manufacturing according to the diameter and the number of ports of the horizontal pipe connection part. For this reason, there is a problem that mold investment costs are high, and work for connecting the divided parts using tape or the like is required, resulting in poor productivity.

[0005] The present invention has been made in view of the above circumstances, and an object thereof is to provide a sound insulation cover that can ensure productivity and can be easily attached to a collecting pipe joint.

Means for Solving the Problems

[0006] In order to solve the above problems, the present invention proposes the following means. The sound insulation cover according to the present invention is a sound insulation cover that covers a manifold pipe joint comprising an upper connecting pipe having a vertical pipe connecting portion that can be connected to a vertical pipe, a horizontal pipe connecting portion that protrudes from the side surface of the vertical pipe connecting portion and can be connected to a horizontal pipe, and a lower connecting pipe connected below the upper connecting pipe, and is characterized by comprising a flexible upper sound insulation cover that is wrapped around the upper connecting pipe from the radial outside, and a tubular lower sound insulation cover through which the lower connecting pipe is inserted.

[0007] According to this invention, since the sound insulation cover includes an upper sound insulation cover that is wrapped around the upper connecting pipe from the radial outside, the outer surface of the upper connecting pipe, which has vertical and horizontal pipe connection parts and tends to have a complex structure, can be covered with a simple configuration. Furthermore, since the sound insulation cover includes 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 manifold joint.

[0008] Furthermore, the manifold joint with a cover according to the present invention is a manifold joint with a cover comprising the sound-insulating cover described above and the manifold joint, wherein the lower connecting pipe has a first engaging portion formed thereon, and the lower sound-insulating cover has a second engaging portion formed thereon that engages with the first engaging portion in the axial direction to prevent the lower sound-insulating cover from coming off downward, and the first engaging portion and the second engaging portion engage in the axial direction when their circumferential positions are aligned with each other, and the engagement is released when their circumferential positions are different from each other.

[0009] According to this invention, a first engaging portion is formed on the lower connecting pipe, and a second engaging portion is formed on the lower sound insulation cover that engages axially with the first engaging portion, thereby preventing the lower sound insulation cover from coming off downwards. Therefore, by making the circumferential positions of the first and second engaging portions different from each other, the first engaging portion of the lower connecting pipe can pass through the inside of the sound insulation cover from top to bottom. Furthermore, by aligning the circumferential positions of the first and second engaging portions with each other, it is possible to prevent the lower sound insulation cover from coming loose downward from the lower connecting pipe.

[0010] Furthermore, a cushioning material with a lower hardness than the lower connecting pipe may be placed in the portion of the first engaging portion that contacts the second engaging portion.

[0011] In this case, since a cushioning material is placed in the first engagement portion, when the manifold joint vibrates due to the influence of the water flowing inside, the vibration can be absorbed by the cushioning material. This prevents the lower sound insulation cover from shifting relative to the lower connecting pipe. [Effects of the Invention]

[0012] According to the present invention, productivity can be ensured, and the device can be easily attached to a manifold joint. [Brief explanation of the drawing]

[0013] [Figure 1] This is a front view of a manifold joint according to the first embodiment of the present invention. [Figure 2] Figure 1 is a front view showing a covered manifold fitting equipped with the manifold fitting shown in Figure 1. [Figure 3] Figure 2 is a top view of the covered manifold fitting shown. [Figure 4] Figure 2 is a rear view of the upper connecting pipe of the covered manifold fitting shown in Figure 2. [Figure 5] Figure 2 is a perspective view showing the sound insulation cover before the upper sound insulation cover is installed. [Figure 6] Figure 5 is a front view of the upper sound insulation cover. [Figure 7] Figure 5 is a top view of the upper sound insulation cover. [Figure 8] Figure 5 is a side view of the upper sound insulation cover. [Figure 9] This is a front view showing the manifold joint shown in Figure 1, with the upper and lower connecting pipes separated. [Figure 10] It is a diagram showing a state where a lower connecting pipe is inserted into a lower sound insulation cover among the collecting pipe joints shown in Fig. 9. [Figure 11] It is a diagram showing a state where a lower connecting pipe and an upper connecting pipe are connected among the collecting pipe joints shown in Fig. 10. [Figure 12] It is a diagram showing a state where an upper sound insulation cover is attached to an upper connecting pipe among the collecting pipe joints shown in Fig. 11. [Figure 13] It is a cross-sectional view along the horizontal direction showing a modified example of the upper sound insulation cover shown in Fig. 5. [Figure 14] It is a top view of a state where the upper sound insulation cover shown in Fig. 13 is attached to the collecting pipe joint. [Figure 15] It is a partial front view of the collecting pipe joint with a cover according to the second embodiment of the present invention. [Figure 16] It is a cross-sectional view of the lower sound insulation cover shown in Fig. 15. [Figure 17] It is a cross-sectional view of the lower connecting pipe shown in Fig. 15. [Figure 18] It is a perspective view of the lower sound insulation cover according to the third embodiment of the present invention. [Figure 19] It is a front view of the lower collecting pipe according to the third embodiment of the present invention. [Figure 20] It is a partial longitudinal sectional view of the collecting pipe joint with a cover according to the third embodiment of the present invention. [Figure 21] It is a front view of the lower collecting pipe according to the fourth embodiment of the present invention. [Figure 22] It is a partial longitudinal sectional view of the collecting pipe joint with a cover according to the fourth embodiment of the present invention. [Figure 23] It is a partial longitudinal sectional view of the collecting pipe joint with a cover according to the fifth embodiment of the present invention.

Embodiments for Carrying Out the Invention

[0014] (First Embodiment) The manifold joint 1 with a cover according to the 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, and thickness may not be the same as those of the actual product and can be modified as appropriate.

[0015] As shown in Figures 1 and 2, the covered manifold joint 1 according to this embodiment comprises a manifold joint 10 and a sound-insulating cover 20 that covers the manifold joint 10. The manifold joint 10 comprises 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 connection portion 13 that can be connected to a first vertical pipe P1, and a horizontal pipe connection portion 14 that protrudes from the side of the vertical pipe connection portion 13 and can be connected to a horizontal pipe P3. The first vertical pipe P1 is connected to the upper end of the upper connecting pipe 11.

[0016] In the following explanation, the direction along the central axis O of the vertical pipe connection 13 is referred to as the axial direction, the upper connecting pipe 11 side of the vertical pipe connection 13 along the axial direction is referred to as the upward direction, and the lower connecting pipe 12 side is referred to as the downward direction. Also, in a plan view from the axial direction, the direction perpendicular to the central axis O is referred to as the radial direction, and in a plan view from the axial direction, the direction that circles around the central axis O is referred to as the circumferential direction.

[0017] As shown in Figure 3, the horizontal pipe connection section 14 extends radially outward from the peripheral wall of the vertical pipe connection section 13. In the illustrated example, three horizontal pipe connection sections 14 are arranged. Two of the three horizontal pipe connection sections 14 are individually positioned to straddle the central axis O in the radial direction. The remaining horizontal pipe connection section 14 extends radially in the direction in which each of the aforementioned two horizontal pipe connection sections 14 extends, and in a direction that forms a 90° angle when viewed from above. However, the configuration is not limited to this, and the number and direction of extension of the horizontal pipe connection sections 14 can be arbitrarily changed. As shown in Figure 1, connecting rings 15 are attached to the radial outer end of the horizontal pipe connection section 14, to which each horizontal pipe P3 is individually connected. The outer diameter of the connecting rings 15 is larger than the outer diameter of the horizontal pipe connection section 14.

[0018] The upper connecting pipe 11 and the lower connecting pipe 12 in the manifold joint 10 may be made transparent. This allows the connection status of the upper connecting pipe 11 and the lower connecting pipe 12 to be visually inspected. In addition, flame retardants such as non-thermal-expanding graphite or magnesium hydroxide may be incorporated.

[0019] The lower connecting pipe 12 is tubular in shape, with a smaller diameter at the bottom than at the top. The lower connecting pipe 12 includes a connecting pipe section 16 located at the upper end and connected below the upper connecting pipe 11, an inclined pipe section 17 connected below the connecting pipe section 16 and gradually decreasing 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.

[0020] The outer diameter of the connecting pipe section 16 is smaller than the outer diameter of the vertical pipe connection section 13 in the upper connecting pipe 11. The peripheral wall of the connecting pipe section 16 is fitted inside the vertical pipe connection section 13. The outer diameter at the upper end of the inclined pipe section 17 is larger than the outer diameter of the connecting pipe section 16. The outer diameter of the inclined pipe section 17 at its lower end is smaller than the outer diameter of the connecting pipe section 16. The axial size of the inclined pipe section 17 is larger than the axial size of the connecting pipe section 16.

[0021] The connecting pipe section 16 contains a resin composition comprising a polyvinyl chloride resin and thermally expandable graphite. That is, the connecting pipe section 16 is manufactured by molding the resin composition. Typically, the connecting pipe section 16 is manufactured by extrusion molding of the resin composition. The connecting pipe section 16 may be a single-layer structure made entirely of a resin composition, or it may be a multi-layer structure consisting of multiple layers. In the case of a multi-layer structure, it is sufficient if any of the layers are made of a resin composition. For example, if the connecting pipe section 16 has a three-layer structure consisting of a surface layer, an intermediate layer, and an inner layer, the intermediate layer may be made of a resin composition, and the surface layer, intermediate layer, and inner layer may contain the heat-absorbing agent.

[0022] The intermediate layer is black because it contains thermally expandable graphite. Therefore, it is preferable to include a coloring agent other than black in the surface and inner layers 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 preferably 0.6 mm to 1.5 mm. If the thickness of the coating layer is 0.3 mm or more, sufficient mechanical strength as a pipe can be ensured, and if it is 3.0 mm or less, a decrease in fire resistance can be suppressed. Furthermore, it is preferable that the connecting pipe section 16 meets the performance requirements described in JIS K6741.

[0023] 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 inside the lower pipe section 18 from below, thereby connecting the second vertical pipe P2 to the lower connecting pipe 12.

[0024] As shown in Figure 2, the sound insulation cover 20 according to this embodiment comprises a flexible upper sound insulation cover 21 that is wrapped around the upper connecting pipe 11 from the radially outer side, and a tubular lower sound insulation cover 22 through which the lower connecting pipe 12 is inserted. The upper sound insulation cover 21 and the lower sound insulation cover 22 are formed in sheet form from elastic materials such as modified asphalt, elastomer, rubber, polyolefin resin, or soft polyvinyl chloride resin.

[0025] The upper sound insulation cover 21 and the lower sound insulation 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 to 5.0 mm, and more preferably 1.5 mm to 4.0 mm. Furthermore, a surface material such as synthetic fiber nonwoven fabric or glass fiber nonwoven fabric may be laminated to one or both sides of the upper sound insulation cover 21 and the lower sound insulation cover 22.

[0026] As shown in Figures 5 to 8, the upper sound insulation cover 21 comprises a sound insulation cover body 21A that, when viewed from the front, has a rectangular strip shape that is longer horizontally than vertically. The sound insulation cover body 21A is attached to the upper connecting pipe 11 such that its vertical direction coincides with the axial direction of the manifold joint 10. The upper sound insulation cover 21 is provided with a raised portion 23 into which a fitting opening 24 is formed, into which the horizontal pipe connection portion 14 is fitted. The raised portion 23 is located in the axial center of the sound insulation cover body 21A and is arranged in multiples with spacing between them in the lateral direction. In the illustrated example, three raised portions 23 are arranged.

[0027] The raised portion 23 is raised toward one side in the thickness direction facing the front and back surfaces of the upper sound insulation cover 21. The raised portion 23 is raised from the surface of the sound insulation cover body 21A opposite to the surface that abuts the outer circumferential surface of the manifold joint 10. Each of the multiple raised portions 23 is approximately circular in plan view, and their intermediate portions in the lateral direction are connected to one another. The raised portion 23 gradually extends toward one side as it approaches the center in a plan view. The fitting opening 24 is formed at the end of the raised portion 23 on one side.

[0028] The mating opening 24 is individually positioned in the lateral center of each of the multiple raised portions 23. In a front view, the mating opening 24 is elliptical in shape, with its long axis coinciding with the vertical direction and its short axis coinciding with the lateral direction. The fitting opening 24 is then widened laterally by the insertion of the horizontal pipe connection portion 14, resulting in a circular shape. The shape of the fitting opening 24 is not limited to this configuration; for example, it may be oval, rhombic, or the like.

[0029] As shown in Figures 3 and 4, the lateral ends of the upper sound insulation cover 21 are connected to each other at the portion of the side surface of the vertical pipe connection 13 where the horizontal pipe connection 14 does not protrude. The lateral ends of the upper sound insulation cover 21 are connected to each other by adhesive or the like, with the ends overlapping radially. Alternatively, the ends of the upper sound insulation cover 21 may be connected to each other by adhesive tape such as butyl rubber tape, which has adhesive and water-sealing properties, instead of adhesive. They may also be detachably connected by fasteners or hook-and-loop fasteners provided at both ends.

[0030] As shown in Figure 3, the upper sound insulation cover 21 is positioned along the outer diameter of the upper connecting pipe 11 and the horizontal pipe connecting section 14. A gap CL, which serves as a sound insulation layer, is formed between the inner surface of the raised section 23 and the outer surface of the manifold joint 10. On the other hand, there is no gap around the fitting opening 24 in the upper sound insulation cover 21. This is because the upper sound insulation cover 21 is elastically deformed so that the fitting opening 24 expands, and the horizontal pipe connection part 14 is inserted into the fitting opening 24. Due to the elastic restoring force of the upper sound insulation cover 21, the inner peripheral edge of the fitting opening 24 comes into close contact with the outer peripheral surface of the horizontal pipe connection part 14.

[0031] As shown in Figure 2, the outer diameter of the lower sound insulation cover 22 is constant across the entire axial direction at the upper side. The outer diameter of the lower sound insulation cover 22 gradually decreases as it extends downwards. The upper end of the lower sound insulation cover 22 covers the lower end of the upper connecting pipe 11.

[0032] The upper end of the lower sound insulation cover 22 is covered from the radially outer side by the upper sound insulation cover 21. The axial position of the lower end of the lower sound insulation cover 22 coincides with the axial position of the middle section of the lower pipe section 18 in the axial direction. That is, the lower end of the lower pipe section 18 is exposed to the outside without being covered by the lower sound insulation cover 22.

[0033] Next, we will explain how to attach the sound insulation cover 20 to the manifold joint 10. As shown in Figure 9, the manifold 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 insulation cover 22 as shown in Figure 10. At this time, the lower connecting pipe 12 is inserted into the inside of the lower sound insulation cover 22 from above the lower sound insulation cover 22.

[0034] Next, as shown in Figure 11, the connecting pipe portion 16 of the lower connecting pipe 12 is inserted and fitted into the lower end opening of the vertical pipe connecting portion 13 of the upper connecting pipe 11. As a result, the upper end of the lower sound insulation cover 22 covers the lower end of the upper connecting pipe 11 from the radial outside. At this time, the connecting ring 15 is not attached to the horizontal pipe connecting portion 14 of the upper connecting pipe 11.

[0035] Next, as shown in Figure 12, the upper sound insulation cover 21 is wrapped around the upper connecting pipe 11 from the radial outside. At this time, the fitting opening 24 of the upper sound insulation cover 21 is widened laterally, causing the upper sound insulation cover 21 to elastically deform, while the horizontal pipe connecting parts 14 are fitted into the fitting opening 24 one by one. This fixes the upper sound insulation cover 21 to the upper connecting pipe 11. Finally, the connecting ring 15 is attached to the radial outer end of the horizontal pipe connection 14. The connecting ring 15 is fixed to the horizontal pipe connection 14 by inserting the horizontal pipe connection 14 into the inside of the connecting ring 15 and fitting them together.

[0036] Next, a modified example of the upper sound insulation cover 21 will be described. As shown in Figure 13, the raised portion 23 of the upper sound insulation cover 21 related to this deformation has a recess 27 formed therein, which is connected to one end in the thickness direction and recesses toward the other side. The fitting openings 24 are each individually located in the lateral center of the recess 27. As shown in Figure 14, a gap CL is formed between adjacent horizontal pipe connection portions 14 in the radial inner side of the upper sound insulation cover 21 when viewed from above.

[0037] As described above, according to the sound insulation cover 20 and the covered manifold joint 1 of this embodiment, the sound insulation cover 20 includes an upper sound insulation cover 21 that is wrapped around the upper connecting pipe 11 from the radial outside. Therefore, the outer surface of the upper connecting pipe 11, which has a vertical pipe connection part 13 and a horizontal pipe connection part 14 and tends to have a complex structure, can be covered with a simple configuration.

[0038] Furthermore, since the sound insulation cover 20 includes a lower sound insulation cover 22 through which the lower connecting pipe 12 is inserted, the work of covering the outer surface of the lower connecting pipe 12 with the sound insulation cover 20 can be easily performed. This ensures the productivity of the sound insulation cover 20 and allows it to be easily attached to the manifold joint 10.

[0039] Furthermore, the sound-insulating cover 20, which is wrapped around the manifold joint 10 from the radial outside, is equipped with a raised portion 23 on which a fitting opening 24 is formed. Therefore, when the manifold 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 manifold joint 10. This makes it easy to secure a sound-insulating layer between the sound-insulating cover 20 and the manifold joint 10. Furthermore, since the fitting opening 24 of the flexible sound-insulating cover 20 is fitted and fixed to the horizontal pipe connection portion 14 of the manifold joint 10, gaps are less likely to occur around the fitting opening 24 through which the horizontal pipe connection portion 14 is inserted.

[0040] Furthermore, since the horizontal pipe connection part 14 is inserted into the fitting opening 24 of the sound insulation cover 20 while deforming it, it is possible to reliably prevent gaps from forming around the fitting opening 24. Furthermore, the lateral ends of the sound insulation cover 20 are connected to each other at the portion of the side surface of the vertical pipe connection 13 where the horizontal pipe connection 14 does not protrude. Therefore, compared to a configuration in which the lateral ends of the sound insulation cover 20 are connected to each other around the horizontal pipe connection 14, for example, the sound insulation cover 20 can be firmly attached to the manifold joint 10.

[0041] (Second Embodiment) Next, with reference to Figures 15 to 17, a covered manifold joint 2 according to the second embodiment of the present invention will be described. In the following embodiments, components identical to those in the first embodiment are denoted by the same reference numerals and their descriptions are omitted; only the differences will be described.

[0042] As shown in Figure 15, a first engaging portion 19 is formed in the lower connecting pipe 12 of the manifold joint 10 according to this embodiment. The first engaging portion 19 is located on the outer circumferential surface of the lower pipe portion 18 of the lower connecting pipe 12. As shown in Figure 17, the first engaging portion 19 has a triangular shape in cross-sectional view and protrudes radially outward. Multiple first engaging portions 19 are arranged at intervals in the circumferential direction. In the illustrated example, three first engaging portions 19 are arranged, and they are equally spaced from one another in the circumferential direction.

[0043] Furthermore, as shown in Figure 15, in this embodiment, the lower sound insulation cover 22 is formed with a second engaging portion 28 that engages axially with the first engaging portion 19 to prevent the lower sound insulation cover 22 from coming off downward. The second engaging portion 28 is formed at the lower end of the lower sound insulation cover 22.

[0044] The first engaging portion 19 and the second engaging portion 28 engage in the axial direction when their circumferential positions are aligned, and disengage when their circumferential positions are different. This point will be described in detail below. The lower end of the lower sound insulation cover 22 has a relief portion 29 that allows passage through the first engagement portion 19 of the lower connecting pipe 12. The relief portion 29 has a triangular shape in cross-sectional view and protrudes radially outward.

[0045] The shape of the relief portion 29 in cross-sectional view is equivalent to the shape of the first engaging portion 19 in cross-sectional view. The size of the relief portion 29 in cross-sectional view is larger than the size of the first engaging portion 19. Multiple relief portions 29 are arranged at intervals in the circumferential direction. In the illustrated example, three relief portions 29 are arranged, and they are equally spaced from one another in the circumferential direction.

[0046] The relief portion 29 extends downward from the axial middle portion of the lower sound insulation cover 22. The amount of radial outward protrusion of the relief portion 29 from the outer surface of the lower sound insulation cover 22 gradually increases as the outer diameter of the lower sound insulation cover 22 decreases downward.

[0047] The relief portion 29 has a triangular shape that is longer in the axial direction than in the circumferential direction when viewed from the front. The size of the relief portion 29 in the circumferential direction gradually increases as it extends downward. In other words, the portion of the lower edge of the lower sound insulation cover 22, excluding the relief portion 29, becomes a second engaging portion 28 that engages with the first engaging portion 19 in the axial direction.

[0048] When inserting the lower connecting pipe 12 into the lower sound insulation cover 22, the lower connecting pipe 12 is inserted into the inside of the lower sound insulation cover 22 with the circumferential positions of the relief portion 29 and the first engaging portion 19 aligned. As a result, the first engaging portion 19 is exposed below the sound insulation cover 20 through the relief portion 29. At this time, the entire first engaging portion 19 is exposed below the sound insulation cover 20.

[0049] Then, by rotating the lower connecting pipe 12 and the lower sound insulation cover 22 relative to each other in the circumferential direction, the lower sound insulation cover 22 covers the outer surface of the lower connecting pipe 12 with the circumferential positions of the relief portion 29 and the first engaging portion 19 being 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 engaging portion 28 of the lower sound insulation cover 22 is placed above the relief portion 29. Therefore, the lower sound insulation cover 22 does not come off downward from the lower connecting pipe 12.

[0050] Furthermore, a cushioning material 40 with a lower hardness than the lower connecting pipe 12 is placed in the portion of the first engaging portion 19 that contacts the second engaging portion 28. The cushioning material 40 can be placed, for example, on the upper surface of the first engaging portion 19. As the cushioning material 40, an elastic resin material such as an elastomer or rubber material is preferred.

[0051] As described above, according to the manifold pipe joint 2 with cover of this embodiment, a first engaging portion 19 is formed on the lower connecting pipe 12, and a second engaging portion 28 is formed on the lower sound insulation cover 22 that engages with the first engaging portion 19 in the axial direction, thereby preventing the lower sound insulation cover 22 from coming off downward. Therefore, by making the circumferential positions of the first engaging portion 19 and the second engaging portion 28 different from each other, the first engaging portion 19 of the lower connecting pipe 12 can pass through the inside of the sound insulation cover 20 from top to bottom.

[0052] Furthermore, by aligning the circumferential positions of the first engaging portion 19 and the second engaging portion 28 with each other, it is possible to prevent the lower sound insulation cover 22 from coming out downward from the lower connecting pipe 12. Furthermore, since the cushioning material 40 is placed in the first engagement portion 19, when the manifold joint 10 vibrates due to the influence of the water flowing inside, the vibration can be absorbed by the cushioning material 40. This prevents the lower sound insulation cover 22 from shifting relative to the lower connecting pipe 12.

[0053] (Third embodiment) Next, with reference to Figures 18 to 20, a covered manifold joint 3 according to the third embodiment of the present invention will be described. In the following embodiments, components identical to those in the second embodiment are denoted by the same reference numerals and their descriptions are omitted; only the differences will be described.

[0054] As shown in Figure 18, in the lower sound insulation cover 22 of the sound insulation cover 20 according to this embodiment, the shape of the second engaging portion 28B differs from that of the second embodiment. Specifically, the second engaging portion 28B is located at the lower end of the inner circumferential surface of the lower sound insulation cover 22 and protrudes radially inward. The second engaging portions 28B are individually positioned on the inner circumferential surface of the lower sound insulation cover 22, at locations that radially straddle the central axis O. The second engaging portions 28B have an angular shape when viewed from above.

[0055] Furthermore, in the lower connecting pipe 12 according to this embodiment, the shape of the first engaging portion 19B differs from that of the second embodiment. The first engaging portion 19B is formed on the outer circumferential surface of the lower pipe portion 18 and has a groove-like shape that is recessed radially inward. The first engaging portion 19B opens downward from the lower end edge of the lower pipe portion 18 and extends upward. The upper end of the first engaging portion 19B extends along the circumferential direction. The first engaging portions 19B are individually arranged on the outer circumferential surface of the lower pipe portion 18 at positions that radially straddle the central axis O.

[0056] When inserting the lower connecting pipe 12 into the lower sound insulation cover 22, the second engaging portion 28B of the lower sound insulation cover 22 is moved into the first engaging portion 19B. Then, by rotating the lower connecting pipe 12 and the lower sound insulation cover 22 relative to each other in the circumferential direction, the second engaging portion 28B and the first engaging portion 19B are engaged in the axial direction. This prevents the lower sound insulation cover 22 from coming out of the lower connecting pipe 12 downwards, as shown in Figure 20.

[0057] (Fourth Embodiment) Next, with reference to Figures 21 and 22, a covered manifold joint 4 according to the fourth embodiment of the present invention will be described. In the following embodiments, components identical to those in the second embodiment are denoted by the same reference numerals and their descriptions are omitted; only the differences will be described.

[0058] As shown in Figure 21, the lower edge of the lower sound-insulating cover 22 in the covered manifold joint 4 according to this embodiment is the second engaging portion 28C. The first engaging portion 19C is located on the lower edge of the lower connecting pipe 12. The first engaging portion 19C protrudes radially outward from the lower edge of the lower pipe portion 18 of the lower connecting pipe 12. The first engaging portion 19C extends around the entire circumference of the lower edge of the lower pipe portion 18. The first engaging portion 19C may also be intermittently provided at circumferential intervals along the lower edge of the lower pipe portion 18.

[0059] When inserting the lower connecting pipe 12 into the lower sound insulation cover 22, the lower end of the lower sound insulation cover 22 is deformed radially outward, exposing the first engaging portion 19C downward from the lower edge of the lower sound insulation cover 22. As a result, as shown in Figure 22, the second engaging portion 28C engages with the first engaging portion 19C in the axial direction, preventing the lower sound insulation cover 22 from coming out downward from the lower connecting pipe 12.

[0060] (Fifth embodiment) Next, with reference to Figure 23, a covered manifold joint 5 according to the fifth embodiment of the present invention will be described. In the following embodiments, components identical to those in the first embodiment are denoted by the same reference numerals and their descriptions are omitted; only the differences will be described.

[0061] As shown in Figure 23, in the covered manifold joint 5 according to this embodiment, 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 insulation cover 22. This prevents the lower sound insulation cover 22 from coming off downward from the lower connecting pipe 12 and reliably prevents sound leakage from the gap between the lower sound insulation cover 22 and the lower end of the lower connecting pipe 12. Furthermore, adhesive tape 31 is wrapped around the lower end of the lower sound insulation cover 22 and the foam tape 30. This firmly fixes the positions of the lower sound insulation cover 22 and the foam tape 30.

[0062] It should be noted that the technical scope of the present invention is not limited to the embodiments described above, and various modifications can be made without departing from the spirit of the invention.

[0063] For example, in each of the above embodiments, the sound insulation cover 20 is shown to have a rectangular strip shape that is longer in the horizontal direction than in the vertical direction when viewed from the front, but it is not limited to this configuration. The shape of the sound insulation cover 20 when viewed from the front can be changed as desired.

[0064] Furthermore, in each of the above embodiments, the mating opening 24 was shown to be longer in the vertical direction than in the horizontal direction when viewed from the front, but the embodiment is not limited to this. The shape of the mating opening 24 can be changed as desired. Furthermore, although the fitting opening 24 is shown to be widened laterally and take on a circular shape when the horizontal pipe connection portion 14 is inserted, it is not limited to this configuration. The fitting opening 24 may take on a circular shape even before the horizontal pipe connection portion 14 is inserted.

[0065] Furthermore, in the above embodiments, the lateral ends of the sound insulation cover 20 are shown to be connected to each other at the portion of the side surface of the vertical pipe connection portion 13 where the horizontal pipe connection portion 14 does not protrude. However, the embodiment is not limited to this configuration. The lateral ends of the sound insulation cover 20 may also be connected to each other around the horizontal pipe connection portion 14 at the side surface of the vertical pipe connection portion 13.

[0066] Furthermore, in each of the above embodiments, the method of attaching the sound insulation cover 20 to the manifold joint 10 is shown as attaching the lower sound insulation cover 22 to the lower connecting pipe 12, and then attaching the upper sound insulation cover 21 to the upper connecting pipe 11 which is connected to the lower connecting pipe 12, but the method is not limited to this. The upper connecting pipe 11 and the lower connecting pipe 12 may be connected first, then the lower sound insulation cover 22 may be attached to the lower connecting pipe 12, and then the upper sound insulation cover 21 may be attached to the upper connecting pipe 11. Furthermore, for example, an inorganic fiber layer such as glass wool or rock wool, which has sound-absorbing and vibration-absorbing properties, may be provided between the sound insulation cover 20 and the manifold joint 10.

[0067] Furthermore, without departing from the spirit of the present invention, the components in the above embodiments may be replaced with well-known components as appropriate, and the above-described modifications may be combined as appropriate. [Explanation of Symbols]

[0068] 1, 2, 3, 4, 5 Covered manifold fittings 10. Manifold joint 11 Upper connecting pipe 12 Lower connecting pipe 13 Vertical pipe connection 14 Horizontal pipe connection 19, 19B, 19C 1st engagement part 20 Soundproof Cover 21 Upper soundproofing cover 22 Lower sound insulation cover 23 Ridge 24 Mating opening 28, 28B, 28C 2nd engagement part 40 Cushioning material

Claims

1. A manifold pipe joint comprising: an upper connecting pipe having a sound-insulating cover, a vertical pipe connection portion that can be connected to a vertical pipe, and a horizontal pipe connection portion that protrudes from the side of the vertical pipe connection portion and can be connected to a horizontal pipe; and a lower connecting pipe connected below the upper connecting pipe, The sound insulation cover comprises a flexible upper sound insulation cover wrapped around the upper connecting pipe from the radially outer side, and a lower sound insulation cover through which the lower connecting pipe is inserted. The lower sound-insulating cover has an outer diameter that is the same in the axial direction at the top and a tubular shape that decreases in diameter as it goes downwards at the bottom. The upper sound-insulating cover is provided with a fitting opening through which the horizontal pipe connection is inserted. The aforementioned fitting opening is formed spaced apart from the lower end of the upper sound insulation cover. The upper end of the lower sound insulation cover covers the lower end of the upper connecting pipe below the horizontal pipe connection portion. The upper end of the lower sound insulation cover is covered by the upper sound insulation cover below the horizontal pipe connection portion. Manifold pipe joint.

2. A manifold pipe joint comprising: an upper connecting pipe having a sound-insulating cover, a vertical pipe connection portion that can be connected to a vertical pipe, and a horizontal pipe connection portion that protrudes from the side of the vertical pipe connection portion and can be connected to a horizontal pipe; and a lower connecting pipe connected below the upper connecting pipe, The sound insulation cover comprises a flexible upper sound insulation cover wrapped around the upper connecting pipe from the radially outer side, and a lower sound insulation cover through which the lower connecting pipe is inserted. The upper sound-insulating cover is provided with a fitting opening through which the horizontal pipe connection is inserted. The aforementioned fitting opening is formed spaced apart from the lower end of the upper sound insulation cover. The upper end of the lower sound insulation cover is covered by the upper sound insulation cover below the horizontal pipe connection portion. Manifold pipe joint.

3. The manifold joint according to claim 1 or 2, wherein the lower end of the upper sound insulation cover is above the lower end of the upper connecting pipe.

4. The lower connecting pipe comprises a connecting pipe section connected below the upper connecting pipe, and an inclined pipe section connected below the connecting pipe section, which decreases in diameter as it extends downward. The manifold joint according to any one of claims 1 to 3, wherein the connecting pipe portion contains a resin composition containing a polyvinyl chloride resin and thermally expandable graphite.

5. The manifold joint according to any one of claims 1 to 3, wherein at least one of the upper sound insulation cover and the lower sound insulation cover contains a metal sheet.

6. A method for manufacturing a manifold pipe joint comprising: an upper connecting pipe having a sound-insulating cover, a vertical pipe connecting portion that can be connected to a vertical pipe, and a horizontal pipe connecting portion that protrudes from the side surface of the vertical pipe connecting portion and can be connected to a horizontal pipe; and a lower connecting pipe connected below the upper connecting pipe, The sound insulation cover comprises a flexible upper sound insulation cover having a fitting opening through which the horizontal pipe connection portion is inserted, and a lower sound insulation cover. The aforementioned fitting opening is formed spaced apart from the lower end of the upper sound insulation cover. The upper connecting pipe and the lower connecting pipe are connected, Next, attach the lower sound insulation cover to the lower connecting pipe. Next, the upper sound insulation cover is attached to the upper connecting pipe so as to cover the upper end of the lower sound insulation cover. A method for manufacturing a manifold pipe joint.

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