Manufacturing method for joint members
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Patents
- Current Assignee / Owner
- SEKISUI CHEMICAL CO LTD
- Filing Date
- 2024-11-28
- Publication Date
- 2026-05-26
Smart Images
Figure 0007866027000001 
Figure 0007866027000002 
Figure 0007866027000003
Abstract
Description
Technical Field
[0001] The present invention relates to a collective joint.
Background Art
[0002] Conventionally, buildings such as apartment houses and office buildings have a collective joint system such as a drainage channel (see, for example, Patent Documents 1 and 2). For example, the collective joint system includes a horizontal pipe that collects drainage on each floor of the building, a vertical pipe that flows the drainage collected in each horizontal pipe downward, and a collective joint that connects the horizontal pipe and the vertical pipe.
[0003] The collective joint includes a joint body formed in a tubular shape, a horizontal pipe connection portion provided on the outer peripheral surface of the joint body, and a swirling blade provided on the inner peripheral surface of the joint body. The joint body is arranged such that its axis is along the vertical direction. The joint body has an inclined pipe portion formed such that its outer diameter and inner diameter gradually decrease from above downward, below the horizontal pipe connection portion. At least a part of the swirling blade is arranged on the inner peripheral surface of the inclined pipe portion. Vertical pipes are connected to the upper end portion and the lower end portion of the joint body, respectively. A horizontal pipe is connected to the horizontal pipe connection portion.
[0004] The vertical pipe connected to the upper end portion of the joint body and the drainage flowing into the joint body from the horizontal pipe hit the upper surface of the swirling blade and flow spirally along the upper surface of the swirling blade. While the drainage flows spirally down in the joint body of the collective joint, the air in the joint body flows upward through the space where the drainage does not flow. Thus, the collective joint system can enhance the drainage performance, which is the flow rate of the drainage flowing inside while suppressing the pressure difference generated inside.
Prior Art Documents
Patent Documents
[0005]
Patent Document 1
[0006] The manifold joints disclosed in Patent Documents 1 and 2 were formed from cast iron or the like by casting, but recently, instead of casting, manifold joints are being formed from resin or the like by injection molding. In this case, since the inclined pipe section is formed as described above, the space above the swivel vanes within the inclined pipe section is formed using a mold core, and after the manifold joint is formed by injection molding, it is easy to move this core upward relative to the manifold joint and remove the core from the manifold joint. However, even if a core is used to form the space below the swivel blades within the inclined pipe section, this core cannot be moved upward because it is locked to the swivel blades. On the other hand, the diameter of the inclined pipe section decreases as it goes downwards, so this core cannot be moved downwards either. After the manifold is formed by injection molding, it is difficult to remove the core from the manifold.
[0007] The present invention has been made in view of these problems, and aims to provide a manifold joint that improves drainage performance by securing a wide space below the swivel vanes in the inclined pipe section when the manifold joint is formed by injection molding. [Means for solving the problem]
[0008] To solve the above problems, this invention proposes the following means. The present invention provides a joint that comprises a joint body formed in a tubular shape with its axis aligned in the vertical direction, and a swivel vane provided on the inner circumferential surface of the joint body, wherein the swivel vane gradually extends toward the first side in the circumferential direction from top to bottom, and the joint body has an inclined pipe section that gradually decreases in diameter from top to bottom, and at least a part of the swivel vane is provided on the inner circumferential surface of the inclined pipe section, and the inner circumferential surface of the inclined pipe section has a first inner surface that is inclined to gradually approach the axis from top to bottom, and a second inner surface located in the lower part of the swivel vane that is inclined to gradually move away from the axis from top to bottom. In this context, the lower part of the swivel blade includes not only the part positioned below any other part of the swivel blade, but also the part that is positioned below a part of the swivel blade but not below any other part of the swivel blade.
[0009] According to this invention, the first inner surface of the inclined pipe section is inclined so as to gradually move away from the axis as it extends from bottom to top. Therefore, the first inner surface can be formed using, for example, a first core of a mold, and after the manifold is formed by injection molding, the first core can be moved upward relative to the manifold to remove the first core from the manifold. Furthermore, the second inner surface of the inclined pipe section is located below the swivel blade and is inclined so as to gradually move away from the axis as it extends downward. Therefore, the second inner surface can be formed using, for example, a second core of a mold, and after the manifold is formed by injection molding, the second core can be moved downward relative to the manifold to remove the second core from the manifold.
[0010] In this way, the second inner surface, which is part of the inner circumferential surface of the inclined pipe section and located below the swivel blades, can be formed using the second core, thus providing a wide space below the swivel blades within the inclined pipe section. For example, when wastewater flows into a manifold joint, it flows in a spiral pattern as it strikes the surface of the swirl vane facing the first side in the circumferential direction. The space located below the swirl vane makes it less likely for the wastewater flow to be obstructed, thus improving the drainage performance of the manifold joint.
[0011] Furthermore, in the above-described manifold joint, at least a portion of the outer surface of the inclined pipe section, which is located radially outward of the second inner surface, may be inclined so as to gradually move away from the axis from top to bottom. According to this invention, the radial thickness of the inclined tube portion, which is positioned between the second inner surface and at least a portion of the outer surface of the inclined tube portion located radially outside the second inner surface, can be reduced, thereby suppressing molding defects such as sink marks that occur in this portion formed by injection molding.
[0012] Furthermore, in the above-described manifold joint, the inner circumferential surface of the inclined pipe portion may have a third inner surface that extends radially outward from the second end in the circumferential direction of the second inner surface and faces the second side. According to this invention, the first inner surface and the second inner surface of the inclined pipe section can be connected by the third inner surface. [Effects of the Invention]
[0013] According to the present invention, when the manifold is formed by injection molding, a wide space can be secured below the swivel vanes within the inclined pipe section, thereby improving drainage performance. [Brief explanation of the drawing]
[0014] [Figure 1] This is a cross-sectional side view of a part of a manifold system in which a manifold manifold according to one embodiment of the present invention is used. [Figure 2] This is a perspective view showing a portion of the lower connecting pipe of the same manifold joint broken. [Figure 3] This is a plan view of the lower connecting pipe. [Figure 4] This is a cross-sectional view along the cutting line IV-IV in Figure 3. [Figure 5]It is a cross-sectional view of the cutting line V-V in FIG. 3. [Figure 6] It is a cross-sectional view of the cutting line VI-VI in FIG. 3. [Figure 7] It is a side view of the lower connecting pipe. [Figure 8] It is a cross-sectional view of a mold for forming the lower connecting pipe by injection molding. [Figure 9] It is a cross-sectional view of the lower connecting pipe of the collective joint of another embodiment of the present invention, which is a figure corresponding to the cross-sectional view shown in FIG. 6. [Figure 10] It is a cross-sectional view showing a state where the lower connecting pipe shown in FIG. 9 is connected to the vertical pipe. [Figure 11] It is a cross-sectional view showing the lower connecting pipe and the vertical pipe constituting the collective joint system of the first modification example of the present invention. [Figure 12] It is a cross-sectional view showing the lower connecting pipe and the vertical pipe constituting the collective joint system of the second modification example of the present invention. [Figure 13] It is a cross-sectional view showing the lower connecting pipe and the vertical pipe constituting the collective joint system of the third modification example of the present invention. [Figure 14] It is a cross-sectional view showing the lower connecting pipe and the vertical pipe constituting the collective joint system of the fourth modification example of the present invention.
Mode for Carrying Out the Invention
[0015] Hereinafter, a collective joint system in which an embodiment of the collective joint according to the present invention is used will be described with reference to FIGS. 1 to 8. As shown in FIG. 1, this collective joint system 1 is used for drainage of the building 101. The collective joint system 1 is arranged on each floor through the slab through-hole 102a formed in the floor slab 102 of the building 101. In FIG. 1, the configuration of the lower connecting pipe 19 described later is shown in a simplified manner.
[0016] The collective joint system 1 includes a collective joint 11, a vertical pipe 46, and a horizontal pipe 48. The manifold joint 11 comprises a joint body 16 and a horizontal pipe connection portion 41. The joint body 16 is formed in a cylindrical shape, and its axis O is positioned along the vertical direction. Hereinafter, the circumferential direction X (see Figure 3) of the joint body 16 will simply be referred to as the circumferential direction X. The joint body 16 comprises an upper connecting pipe 17 and a lower connecting pipe 19 connected to the upper connecting pipe 17 via an intermediate pipe 18. A horizontal pipe connection portion 41 is fixed to the outer circumferential surface of the upper connecting pipe 17. In this embodiment, multiple horizontal pipe connection portions 41 are provided on the outer circumferential surface of the upper connecting pipe 17. A horizontal pipe 48 is connected to the horizontal pipe connection portion 41. A weir plate 22 is fixed to the inner surface of the upper connecting pipe 17. The weir plate 22 prevents wastewater from flowing back into the horizontal pipe 48. The upper connecting pipe 17 is made of polyvinyl chloride resin or the like.
[0017] A vertical pipe connector 23 is attached to the upper end of the upper connecting pipe 17. The vertical pipe connector 23 is equipped with a first swivel vane 24. The first swivel vane 24 is positioned in the vertical direction to correspond to the horizontal pipe 48. A vertical pipe 46 is connected to the vertical pipe connection section 23. The outer diameter of the vertical pipe 46 is smaller than the inner diameter of the upper connecting pipe 17.
[0018] The intermediate pipe 18 and the lower connecting pipe 19 are positioned below the horizontal pipe connection section 41. The intermediate tube 18 is preferably made of a polyvinyl chloride resin and contains a resin composition that includes a polyvinyl chloride resin and thermally expandable graphite. That is, the intermediate tube 18 is manufactured by molding the resin composition. Typically, the intermediate tube 18 is manufactured by extruding the resin composition. Furthermore, the intermediate pipe 18 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 that any one of the layers is made of a resin composition. For example, if the intermediate pipe 18 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 a heat-absorbing agent. If the intermediate pipe 18 does not contain thermally expandable graphite, a sheet-like fire-resistant material containing thermally expandable graphite may be wrapped around the outer surface of the intermediate pipe 18 or the outer surface of the sound-insulating material covering the intermediate pipe 18, and the fire-resistant material may be embedded in the slab penetration hole 102a.
[0019] As an example, a single-layer structure can be adopted, consisting of a resin composition containing 1 to 20 parts by weight of thermally expandable graphite per 100 parts by weight of polyvinyl chloride resin. Alternatively, a three-layer structure can be adopted, consisting of a thermally expandable fire-resistant layer made of a resin composition containing 1 to 20 parts by weight of thermally expandable graphite per 100 parts by weight of polyvinyl chloride resin, and a coating layer of a polyvinyl chloride resin composition that does not contain thermally expandable graphite covering the inner and outer surfaces of this thermally expandable fire-resistant layer.
[0020] If the intermediate pipe 18 has a single-layer structure, if the amount of thermally expandable graphite is less than 1 part by weight, sufficient thermal expansion may not be obtained during combustion, and the desired fire resistance may not be achieved. If it exceeds 20 parts by weight, it may expand too much due to heating, and the residue may fall out of the slab penetration hole 102a without being able to maintain its shape, potentially reducing fire resistance.
[0021] When the intermediate pipe 18 has a multilayer structure, the resin composition containing the heat-expandable refractory material is not particularly limited, but it is preferable to have a composition containing 1 to 20 parts by weight of heat-expandable graphite per 100 parts by weight of polyvinyl chloride resin. The content of heat-expandable graphite is more preferably 4 to 18 parts by weight, and even more preferably 6 to 16 parts by weight. Furthermore, if the intermediate pipe 18 is present throughout the entire slab penetration hole 102a, even if the thermally expandable graphite content is relatively high at 15 parts by weight or more and the residue is brittle, the residue can block the entire slab penetration hole 102a, retaining the thermally expanded residue within the floor slab 102 and making it less likely to fall out.
[0022] If the intermediate layer contains thermally expandable graphite, the intermediate layer will appear black. Therefore, it is preferable to include a coloring agent other than black in the surface layer and inner layer 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 intermediate pipe 18 meets the performance requirements described in JIS K6741. In other words, if the amount of thermally expandable graphite is less than 1 part by weight, sufficient thermal expansion may not be obtained during combustion, and the desired fire resistance may not be achieved. If the amount of thermally expandable graphite exceeds 20 parts by weight, it may expand too much when heated, and the residue may fall out of the slab through-hole 102a without being able to maintain its shape, potentially reducing fire resistance.
[0023] As an example, the thermally expandable graphite used in this embodiment can be a crystalline compound obtained by acid treatment of powders such as natural scaly graphite, pyrolysis graphite, or quiche graphite with an inorganic acid and a strong oxidizing agent to insert the inorganic acid between the graphite layers, and then adjusting the pH. As inorganic acids, concentrated sulfuric acid, nitric acid, selenic acid, etc., can be used. As strong oxidizing agents, concentrated nitric acid, perchloric acid, perchlorate, permanganate, dichromate, hydrogen peroxide, etc., can be used.
[0024] By adjusting the pH as described above, it is possible to use crystalline compounds that maintain a layered carbon structure, such as thermally expandable graphite adjusted to a pH of 1.5 to 7.0, and thermally expandable graphite with a 1.3x expansion temperature of 180°C to 280°C.
[0025] If the pH of thermally expandable graphite is below 1.5, it is too acidic and can easily cause corrosion of molding equipment, and if the pH exceeds 7.0, the carbonization-promoting effect of polyvinyl chloride resin will be diminished, and sufficient fire resistance may not be obtained. The particle size of the thermally expandable graphite is not particularly limited, but for example, a particle size in the range of 100 to 400 μm, preferably in the range of 120 to 350 μm, can be used.
[0026] The resin composition constituting the intermediate tube 18 may optionally contain additives such as stabilizers, inorganic fillers, flame retardants, lubricants, processing aids, impact modifiers, heat resistance improvers, antioxidants, light stabilizers, ultraviolet absorbers, pigments, plasticizers, and thermoplastic elastomers, to the extent that they do not hinder the purpose of this embodiment.
[0027] A second swirling vane may be provided on the inner circumferential surface of the intermediate pipe 18. The upper end of the intermediate pipe 18 is fitted inside the lower end of the upper connecting pipe 17. The connection between the upper connecting pipe 17 and the intermediate pipe 18 is joined, for example, with an adhesive. In this embodiment, as shown in Figure 1, the connection portion between the upper connecting pipe 17 and the intermediate pipe 18 is located within the slab penetration hole 102a of the floor slab 102. Mortar 103 is filled into the slab penetration hole 102a. However, this is not the only option, and the lower end of the upper connecting pipe 17 and the upper end of the intermediate pipe 18 may be located above the upper surface of the floor slab 102.
[0028] Note that the intermediate pipe 18 is not necessary. In that case, the upper connecting pipe 17 and the lower connecting pipe 19 are directly connected. If the connecting pipe section 31 at the upper end of the lower connecting pipe 19 is a socket, the lower end of the upper connecting pipe 17 is a socket and is inserted into the lower connecting pipe 19. If the connecting pipe section 31 at the upper end of the lower connecting pipe 19 is a socket, the lower end of the upper connecting pipe 17 is a socket and the lower connecting pipe 19 is inserted into this lower end. In these cases, the aforementioned sheet-like fire-resistant material (hereinafter also referred to as the fire-resistant sheet) can be wrapped around the connection portion between the upper connecting pipe 17 and the lower connecting pipe 19. In this case, the fire-resistant sheet is wrapped around the portion of the upper connecting pipe 17 or the lower connecting pipe 19 located below the horizontal pipe connection portion 41. When wrapping the fire-resistant sheet around the lower connecting pipe 19, the outer surface of the lower connecting pipe 19 in the area where the third swivel vane 34 is located is recessed (recess 32e) as described later, making it difficult to wrap the fire-resistant sheet around this area. Therefore, it is preferable to wrap the fire-resistant sheet around the area of the lower connecting pipe 19 where the third swivel vane 34 is not located. On the other hand, if a protrusion 36, described later, is provided in this area, the fire-resistant sheet is supported by the protrusion 36. Therefore, the fire-resistant sheet may be wrapped around the lower connecting pipe 19 up to the position where the third swivel vane 34 is located.
[0029] As shown in Figures 2 and 3, the lower connecting pipe 19 comprises a connecting pipe section 31, an inclined pipe section 32, a lower pipe section (vertical pipe connecting section) 33, and a third swivel vane (swivel vane) 34.
[0030] The connecting pipe section 31 is formed in a cylindrical shape and is fitted to the outside of the lower end of the intermediate pipe 18 (see Figure 1). The connecting pipe section 31 is joined to the intermediate pipe 18 by, for example, an adhesive. The inclined tube section 32 is formed in a cylindrical shape and is designed to gradually decrease in diameter from top to bottom. In other words, the inclined tube section 32 is designed so that its outer diameter and inner diameter gradually decrease from top to bottom. That is, all inner surfaces of the inclined tube section 32 except for the inner surface below the third swivel vane 34 are tapered so that they approach the axis O as they go downwards. The inclined pipe section 32 is arranged coaxially with the connecting pipe section 31. The upper end of the inclined pipe section 32 is fixed to the inner circumferential surface of the lower end of the connecting pipe section 31. The upper end of the inclined pipe section 32 is in contact with the lower end of the intermediate pipe 18 from below (see Figure 1).
[0031] As shown in Figure 2, the lower pipe section 33 is formed in a cylindrical shape. The lower pipe section 33 is arranged coaxially with the inclined pipe section 32. The upper end of the lower pipe section 33 is fixed to the outer surface of the lower end of the inclined pipe section 32. As shown in Figure 1, a vertical pipe 46 is connected to the lower pipe section 33. Vertical pipes 46 are connected to the upper and lower ends of the joint body 16, respectively. Both vertical pipes 46 are arranged coaxially.
[0032] The third swivel blade 34 is fixed to the portion of the inclined pipe section 32 below the connecting pipe section 31 on the inner circumferential surface. Alternatively, a portion of the third swivel blade 34 may be fixed to the inner circumferential surface of the inclined pipe section 32, and the remaining portion of the third swivel blade 34 may be fixed to the inner circumferential surface of the connecting pipe section 31 or the lower pipe section 33. As shown in Figures 2 and 3, the third swivel blade 34 gradually extends toward the first side X1 in the circumferential direction X as it is viewed from above to below. More specifically, the surface 34a of the third swivel blade 34 facing the first side X1 gradually extends toward the first side X1 as it is viewed from above to below. The surface 34b of the third swivel blade 34 facing the second side X2 in the circumferential direction X gradually extends toward the first side X1 as it is viewed from above to below. Furthermore, a portion of the lower surface of the third swivel blade 34 may be configured to gradually extend toward the first side X1 as it moves from above downwards, with the remaining portion of the lower surface of the third swivel blade 34 extending along the horizontal plane.
[0033] Figure 4 is a cross-sectional view along the cutting line IV-IV in Figure 3. Similarly, Figures 5 and 6 are cross-sectional views along the cutting lines VV and VI-VI in Figure 3. The following describes the details of the inner and outer circumferential shapes of the inclined pipe section 32. As shown in Figures 2 to 6, the inner circumferential surface of the inclined pipe section 32 is provided with a first inner surface 32a, a second inner surface 32b, and a third inner surface 32c. The first inner surface 32a is located in the upper part of the third swivel blade 34 and in the circumferential part where the third swivel blade 34 is not positioned. The first inner surface 32a is inclined so as it approaches the axis O from top to bottom. In other words, the first inner surface 32a is inclined so as it moves away from the axis O from bottom to top. Note that when the lower end of the third swivel blade 34 is positioned at the upper end of the inclined pipe section 32, the first inner surface 32a does not need to be formed in the upper part of the third swivel blade 34.
[0034] The second inner surface 32b is located in the lower part of the third swivel blade 34. As shown in Figures 4 to 6, the second inner surface 32b is inclined so as to gradually move away from the axis O from top to bottom. The second inner surface 32b protrudes below the surface 34b of the third swivel blade 34. The second inner surface 32b protrudes radially inward more than the first inner surface 32a. As shown in Figure 2, the third inner surface 32c extends radially outward from the end of the second side X2 in the circumferential direction of the second inner surface 32b. The third inner surface 32c faces the second side X2 and is parallel to the axis O. The third inner surface 32c may also be inclined to gradually face the second side X2 in the circumferential direction X as it extends downward.
[0035] As shown in Figures 4 and 7, the outer circumferential surface of the inclined pipe section 32 is provided with a first outer surface 32d (at least a portion of the outer circumferential surface of the inclined pipe section). The first outer surface 32d is located radially outward of the second inner surface 32b. The first outer surface 32d is inclined so as to gradually move away from the axis O from top to bottom. That is, in the cross-section shown in Figure 4, the first outer surface 32d and the second inner surface 32b are parallel to each other, and the thickness of the inclined pipe section 32 sandwiched between the first outer surface 32d and the second inner surface 32b is constant. The first outer surface 32d is formed over the entire area corresponding to the second inner surface 32b. In other words, in the cylindrical inclined tube section 32, the inner and outer circumferential surfaces of the portion corresponding to the second inner surface 32b are concave toward the axis O. In the portion of the inclined tube section 32 corresponding to the second inner surface 32b, so-called material removal has been performed. In other words, a recess 32e is formed on the outer circumferential surface of the inclined tube section 32, which is concave toward the axis O.
[0036] As shown in Figures 4 and 7, the first outer surface 32d of the inclined pipe section 32 has multiple protrusions 36 that project radially outward. The multiple protrusions 36 extend in the circumferential direction and are spaced apart from each other in the vertical direction. The formation of the protrusions 36 improves the strength of the inclined pipe section 32 and has the effect of suppressing vibrations that occur when drainage is in the third swirling vane 34. Furthermore, as mentioned above, when wrapping a fire-resistant sheet around the lower connecting pipe 19, it also has the effect of holding the fire-resistant sheet and sound-insulating cover provided around the inclined pipe section 32. The first outer surface 32d may be formed in a portion of the area corresponding to the second inner surface 32b.
[0037] The connecting pipe section 31, the inclined pipe section 32, the lower pipe section 33, and the third swivel vane 34 that constitute the lower connecting pipe 19 are integrally formed by injection molding of, for example, polyvinyl chloride resin. The joint body 16 is composed of three components: an upper connecting pipe 17, an intermediate pipe 18, and a lower connecting pipe 19. The joint body may also be composed of two or more components, or it may be constructed as a single integrated component. Furthermore, the upper connecting pipe 17 and the lower connecting pipe 19 may be made transparent. This allows the connection status of the upper connecting pipe 17, the intermediate pipe 18, and the lower connecting pipe 19 to be visually inspected from the outside.
[0038] A sound-insulating cover may be provided on the outer surface of the joint body 16 as a sound-insulating measure. The sound-insulating cover is formed, for example, from a sheet of soft polyvinyl chloride, butyl rubber, or polypropylene (PP) resin with a thickness of 0.8 to 2 mm. The sound-insulating cover may also be a laminate in which a sound-absorbing layer of polyester fiber, urethane foam, or glass wool or rock wool with a thickness of 5 to 20 mm is provided on the inside of the above sheet. Alternatively, the recess 32e provided on the outer surface of the inclined pipe portion 32 of the lower connecting pipe 19 may be filled with the material constituting the sound-absorbing layer, thereby eliminating the recess 32e in appearance. This allows the sound-insulating cover provided around the lower connecting pipe 19 to be supported by the filled material.
[0039] Next, a method for manufacturing the lower connecting pipe 19 configured as described above will be explained. As shown in Figure 8, the lower connecting pipe 19 is formed by injection molding using a mold 51. For example, the mold 51 includes a first core 52, a second core 53, a first cavity 54, and a second cavity 55. In a typical mold, the parting line between the cores is the connection point between the inclined pipe section 32 and the lower pipe section 33 of the lower connecting pipe 19, as shown by line L in Figure 8. However, in mold 51, a recess 52a is formed in the first core 52, and a protrusion 53a corresponding to the recess 52a is formed in the second core 53. The protrusion 53a extends beyond line L into the recess 52a side, forming the third swirling blade 34 between the protrusion 53a and the recess 52a.
[0040] The first core 52 forms the surface 34a of the third swivel blade 34 and the first inner surface 32a of the inclined tube section 32. The protrusion 53a of the second core 53 forms the surface 34b of the third swivel blade 34 and the second inner surface 32b of the inclined tube section 32. After forming the lower connecting tube 19 in the mold 51, the first core 52 is moved upward relative to the lower connecting tube 19 to remove the first core 52 from the lower connecting tube 19. Similarly, the second core 53 is moved downward relative to the lower connecting tube 19 to remove the second core 53 from the lower connecting tube 19. The first cavity 54 is moved to the left relative to the lower connecting tube 19 to remove the first cavity 54 from the lower connecting tube 19. The second cavity 55 is moved to the right relative to the lower connecting tube 19 to remove the second cavity 55 from the lower connecting tube 19. In this way, the lower connecting pipe 19 is manufactured by injection molding.
[0041] As described above, according to the manifold 11 of this embodiment, the first inner surface 32a of the inclined pipe section 32 is inclined so as to gradually move away from the axis O from bottom to top. For this reason, the first inner surface 32a can be formed using the first core 52 of the mold 51, and after the lower connecting pipe 19 of the manifold 11 is formed by injection molding, the first core 52 can be moved upward relative to the lower connecting pipe 19 to remove the first core 52 from the lower connecting pipe 19. In addition, the second inner surface 32b of the inclined pipe section 32 is located below the third swivel vane 34 and is inclined so as to gradually move away from the axis O from bottom to top. For this reason, the second inner surface 32b can be formed using the second core 53 of the mold 51, and after the lower connecting pipe 19 is formed by injection molding, the second core 53 can be moved downward relative to the lower connecting pipe 19 to remove the second core 53 from the lower connecting pipe 19.
[0042] In this way, the second inner surface 32b, which is part of the inner circumferential surface of the inclined pipe section 32 and is located below the third swivel blade 34, can be formed using the second core 53, thereby providing a wide space below the third swivel blade 34 within the inclined pipe section 32. When wastewater flows into the manifold joint 11, it strikes the surface 34a of the third swirl vane 34 and flows in a spiral pattern. The space located below the third swirl vane 34 makes it less likely for the wastewater flow to be obstructed, thus improving the drainage performance of the manifold joint 11.
[0043] The first outer surface 32d, located radially outward from the second inner surface 32b, is inclined so as it moves from top to bottom, gradually moving away from the axis O. This reduces the radial thickness of the inclined tube section 32 located between the second inner surface 32b and the first outer surface 32d, thereby suppressing molding defects such as sink marks that occur in this portion formed by injection molding. The inner circumferential surface of the inclined pipe section 32 is provided with a third inner surface 32c. Therefore, the first inner surface 32a and the second inner surface 32b of the inclined pipe section 32 can be connected by the third inner surface 32c.
[0044] The surfaces 34a and 34b of the third swivel blade 34 gradually extend toward the first side X1 from top to bottom. This allows for a thinner third swivel blade 34, suppressing molding defects such as sink marks in this part formed by injection molding. Furthermore, a wider space is secured below the third swivel blade 34 within the inclined pipe section 32, further improving the drainage performance of the manifold joint 11.
[0045] Although one embodiment of the present invention has been described in detail above with reference to the drawings, the specific configuration is not limited to this embodiment, and modifications, combinations, deletions, etc., of the configuration are also included without departing from the spirit of the present invention. For example, in the above embodiment, the outer circumferential surface of the inclined pipe portion 32, which is located radially outward of the second inner surface 32b, may be a flat shape along the axis O or the like. Furthermore, the surface 34a or surface 34b of the third rotating blade 34 may not be a flat surface, but a curved surface that curves upward or downward. In addition, continuous or discontinuous protrusions or recesses may be formed on the surface 34a or surface 34b. Furthermore, in the above embodiment, the projections 36 located radially outward of the second inner surface 32b extend in the circumferential direction X and are spaced apart from each other in the vertical direction. However, the projections 36 may also extend in the vertical direction (in the direction of the pipe axis), and both projections 36 extending in the circumferential direction X and projections 36 extending in the vertical direction may be provided.
[0046] The connecting pipe section 31 and the lower pipe section 33 are designated as sockets, but they may also be jacks. If the connecting pipe section 31 is a socket, the intermediate pipe 18 can be omitted as described above, and the connecting pipe section 31 can be inserted into the lower end (receptacle) of the upper connecting pipe 17. When the lower pipe section 33 is a socket, it can be configured as shown in Figures 9 and 10, which represent another embodiment of the lower connecting pipe 19A. In this lower connecting pipe 19A, the upper end of the vertical pipe 46A located below the manifold joint 11 is used as the socket 46a, and the lower pipe section 33 is inserted into the socket 46a. In the illustrated example, the diameter (outer diameter, inner diameter) of the lower pipe section 33 is the same as the diameter of the lower end of the inclined pipe section 32.
[0047] As shown in Figure 10, if the upper end of the vertical pipe 46A is a socket 46a, a rubber ring 46b can be provided inside the socket 46a to enhance watertightness. In the illustrated example, the inner diameter of the socket 46a is larger than the outer diameter of the lower pipe section 33. The rubber ring 46b is fitted into the socket 46a from the inside and into the lower pipe section 33 from the outside. In other words, the rubber ring 46b is sandwiched between the socket 46a and the lower pipe section 33. This allows the rubber ring 46b to exhibit its watertightness.
[0048] Incidentally, in the case of the lower connecting pipe 19A, for example, if the vertical pipe 46A and the lower connecting pipe 19 move unexpectedly, the rubber ring 46b may fit onto the outer surface of the inclined pipe section 32 instead of the outer surface of the lower pipe section 33. This type of unexpected movement may be caused, for example, by the vertical pipe 46A moving due to thermal expansion or contraction, or by an error made by the worker during installation. In this case, when the rubber ring 46b is fitted to the outer surface of the inclined pipe section 32, there is a risk that the rubber ring 46b will be located at the height of the recess 32e created by the third swirling vane 34 in the lower connecting pipe 19. In this case, a gap will be created between the rubber ring 46b and the lower pipe section 33, and the watertightness provided by the rubber ring 46b will be impaired. Therefore, a means (hereinafter referred to as the restricting means 60) is provided to restrict the relative movement of the vertical pipe 46A and the lower connecting pipe 19. This prevents the rubber ring 46b from overlapping with the recess 32e, and ensures watertightness by the rubber ring 46b.
[0049] Specific examples of regulatory measures 60 are shown in Figures 11 to 14 below.
[0050] The restricting means 60A shown in Figure 11 is provided on the lower connecting pipe 19B. The restricting means 60A is provided at the connection point between the inclined pipe section 32 and the lower pipe section 33 in the lower connecting pipe 19B. In other words, the restricting means 60A is located below the height of the recess 32e. The restricting means 60A is a projection that protrudes radially outward. In the illustrated example, the restricting means 60A is provided around the entire circumference in the circumferential direction X. In this case, when the unexpected movement described above is about to occur, the upper end of the vertical pipe 46A comes into contact with the lower surface of the restricting means 60A, restricting further movement.
[0051] The restricting means 60C shown in Figure 12 is provided on the vertical pipe 46B. The restricting means 60C is provided at the upper end of the vertical pipe 46B. The restricting means 60C is a projection that protrudes radially inward. In the illustrated example, the restricting means 60C is provided around the entire circumference in the circumferential direction X. The inner diameter of the restricting means 60C is equal to the outer diameter of the lower pipe section 33. In this case, when the unexpected movement described above is about to occur, the restricting means 60C contacts the lower end of the inclined pipe section 32, restricting further movement.
[0052] The restricting means 60D shown in Figure 13 is provided on the vertical pipe 46C. In this modified example, the shape of the socket 46a differs from that of other modified examples. That is, the inner diameter of the socket 46a in this modified example is the same as the outer diameter of the lower pipe section 33. An annular recess 46c extending in the circumferential direction X is provided on the inner circumferential surface of the socket 46a. The rubber ring 46b is fitted into the recess 46c. The restricting means 60D is formed by the upper end of the vertical pipe 46C. In this case, when unexpected movement as described above is about to occur, the restricting means 60D (upper end of the vertical pipe 46C) contacts the lower end of the inclined pipe section 32, similar to the modified example shown in Figure 12, and further movement is restricted.
[0053] The restricting means 60E shown in FIG. 14 is provided on the rubber ring 46b. The restricting means 60E is provided at the lower end of the rubber ring 46b. The restricting means 60E is a protrusion that projects inward in the radial direction. In the illustrated example, the restricting means 60E is provided over the entire circumference in the circumferential direction X. The inner diameter of the restricting means 60E is not greater than the outer diameter of the lower pipe portion 33. In this case, when an unexpected movement as described above tends to occur, the restricting means 60E contacts the lower end of the lower pipe portion 33, and further movement is restricted. In this case, it is preferable that the distance L1 from the restricting means 60E to the lower end of the lower pipe portion 33 is shorter than the distance L0 from the upper end of the vertical pipe 46A to the recess 32e (L1 < L0). Also, the restricting means 60E may be formed by a stepped portion 46d provided at the base end of the receiving port 46a, or may be provided as a protrusion inside the receiving port 46a. In these cases, the inner diameter of the receiving port 46a may be equal to the outer diameter of the lower pipe portion 33, as in the vertical pipe 46C shown in FIG. 13.
[0054] The collective joint 11 does not necessarily include the vertical pipe connection portion 23 and the horizontal pipe connection portion 41. The position where the turning blade is provided inside the joint body 16 is not particularly limited, and may be, for example, a position equivalent to the horizontal pipe connection portion 41 in the vertical direction. The joint body 16 is formed in a circular tubular shape. However, the shape of the joint body is not limited to this, and the joint body may be formed in an elliptical tubular shape, a square tubular shape, or the like.
Explanation of Reference Numerals
[0055] 11 Collective joint 16 Joint body 32 Inclined pipe portion 32a First inner surface 32b Second inner surface 32c Third inner surface 32d First outer surface (at least a part of the outer peripheral surface of the inclined pipe portion) 34 Third turning blade (turning blade) O Axis X Circumferential direction X1 First side X2 Second side
Claims
1. A method for manufacturing a joint member having a connecting pipe portion which is a socket at one end, a vertical pipe connecting portion which is a socket at the other end, an inclined pipe portion between the connecting pipe portion and the vertical pipe connecting portion, a swivel vane having an upper surface and a lower surface, a first inner surface and a second inner surface on the inner surface of the inclined pipe portion, and a recess on the outer surface of the second inner surface, Formed by injection molding of polyvinyl chloride resin using a mold, The aforementioned mold is The first inner surface and the first core forming one surface of the swivel blade, The second inner surface and the second core forming the other surface of the swivel blade, A first cavity that forms one portion of the outer surface of the inclined pipe section, The outer surface of the inclined pipe section is provided with a second cavity that forms the other portion, The second cavity forms the recess, A method for manufacturing joint members.
2. The inclined pipe section is provided with a projection between it and the vertical pipe connection section. The first cavity forms one portion of the outer surface of the projection, The second cavity forms the other portion of the outer surface of the projection. A method for manufacturing a joint member according to claim 1.
3. It has a third inner surface that connects the first inner surface and the second inner surface, The third inner surface is formed by the first core. A method for manufacturing a joint member according to claim 1 or 2.
4. A method for manufacturing a joint member according to any one of claims 1 to 3, wherein the second cavity forms a projection that protrudes radially outward in the recess.