JP2018031445A - Coupler - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a thermal weld deposited thermo-plastic synthetic resin coupler capable of attaining a desired thermal weld deposition strength and showing no leakage from the thermal weld deposited part.SOLUTION: This invention relates to a thermoplastic synthetic resin male side fluid coupler comprising a flange formed at an end part side of a barrel part and having a larger diameter than that of the barrel part, a male side connection cylinder part formed at an end part near the flange and having a smaller diameter than that of the flange, and a root part radial direction recess part formed at a root side of the flange of the male side connection cylinder part and formed in a peripheral direction to cause its diameter to be smaller than that of the male side connection cylinder part; and a thermoplastic synthetic resin female side fluid coupler comprising a flange formed at an end part of the barrel part and having a larger diameter than that of the barrel part and a female side in-pipe connection part having an inner diameter larger than an outer diameter of the male side connection cylinder part, the flange of the male side fluid coupler and the flange of the female side fluid coupler are thermally deposited to each other under a state in which the male side connection cylinder part is fitted to the female side in-pipe connection part, and a part of resin of the female side fluid coupler is entered into the root part radial direction recess part.SELECTED DRAWING: Figure 8

Description

  The present invention relates to a synthetic resin connection pipe (joint).

  For example, Patent Document 1 proposes a connection pipe joint obtained by welding thermoplastic synthetic resin pipes so as to prevent the occurrence of inner surface beads. In Patent Document 1, the tubular ends of a pair of resin molded products to be joined are heated until they are melted by a heating means, and the tubular ends are pressed against each other to be melt-bonded, and this bonded state is kept under pressure for a certain period of time. It is described that the inner surface bead generated on the inner surface of the pipe is reduced to a smooth state by stretching in a direction opposite to the pressing direction.

JP 2004-216859 A

However, in the welding method described in Patent Document 1, the tubular ends of the resin molded product are heated until they are melted by a heating means, and the tubular ends are pressed and pressed together to be melt-bonded. In order to hold the pressure, the molten resin protrudes in the inner circumferential direction of the joint and rises as a molten bead, or the joint between the pipe joints is misaligned and the weld weld cross-sectional area due to deformation is reduced, the strength is reduced and the inside There is a problem that voids are easily generated.
Furthermore, in order to smoothly reduce the joint where the molten resin between the synthetic resin pipes protrudes and rises as a molten bead, in the stretching process, the temperature control of the heat source heater and peripheral members, the melting method by heating only the end of the member There are many conditions that should be managed, such as pressure holding method, cooling method, etc., it is difficult to cope with temperature environment creation, and it is difficult to maintain appropriate strength because the welding cross-sectional area decreases and the melted part thickness decreases. It also has the problem.

  Therefore, such a connection pipe joint is an inexpensive synthetic resin pipe member, and is required to be further easily assembled by a welding method with few conditions to be managed.

  An object of the present invention is to provide a thermoplastic welded joint that is capable of obtaining a desired welding strength and that does not leak from the welded portion.

  The purpose of the above is to provide a flange having a diameter larger than that of the body formed on the end side of the body, a male connection cylinder formed at the end of the flange and having a diameter smaller than the flange, and the male side. A male side fluid coupling made of a thermoplastic synthetic resin, formed on the base side of the flange of the connecting cylinder part and having a root part radial recess formed in the circumferential direction so as to be smaller in diameter than the male side connecting cylinder part; A thermoplastic synthetic resin female side fluid coupling having a flange formed at an end of the part and having a larger diameter than the body part and a female side pipe connecting part whose inner diameter is larger than the outer diameter of the male side connecting cylinder part; The flange of the male fluid coupling and the flange of the female fluid coupling are thermally welded with the male connecting tube portion fitted into the female pipe connecting portion, and the root portion radial recess is A joint in which a part of the resin of the female side fluid coupling enters. It is achieved by the.

  ADVANTAGE OF THE INVENTION According to this invention, the desired welding intensity | strength can be obtained and the joint made from a thermoplastic synthetic resin by which it welded without the leak from a welding part can be provided.

The perspective view which shows the L-type male side fluid coupling which is one Example of this invention. 1 is a perspective view showing a T-shaped female fluid coupling that is one embodiment of the present invention. FIG. BRIEF DESCRIPTION OF THE DRAWINGS The front view which shows the coupling formed by welding the L type male side fluid coupling and T type female side fluid coupling which are one Example of this invention. The front view of the L type male side fluid coupling and T type female side fluid coupling before welding. The figure which combined the L type male side fluid coupling and the T type female side fluid coupling in the state which has not welded. AA arrow sectional drawing shown in FIG. Sectional drawing before combining an L type male side fluid coupling and a T type female side fluid coupling. Sectional drawing of the L type male side fluid coupling and T type female side fluid coupling after welding. The figure which shows a heat welding apparatus.

  Hereinafter, examples will be described with reference to the drawings.

  For example, in a heat pump hot water supply apparatus using a refrigeration cycle, hot water stored in a hot water storage container is used as a heat medium, tap water serving as a heat exchange medium is heated, and hot water generated by heating the tap water is used. Hot water is supplied to the person Such a heat pump type hot water supply device circulates in a hot water heat exchanger or hot water storage container that heats tap water by exchanging heat between tap water and hot water. These flow paths are constituted by a plurality of connection pipe joints (hereinafter also referred to as fluid joints and connection pipes).

  FIG. 3 shows a fluid coupling 3 in which a fluid joint having a bent portion and a fluid joint having a branched portion are combined, and both the bent portion and the branched portion are provided. A fluid coupling having such a bent portion is shown in FIG. The fluid joint having the bent portion shown in FIG. 1 is an L-shaped male fluid coupling (male connecting pipe) 1. The L-shaped male side fluid coupling 1 is formed of a thermoplastic synthetic resin. Specifically, it is made of PPS (polyphenylene sulfide) and has a melting point of 290 degrees.

  The L-shaped male-side fluid coupling 1 has a cylindrical fastener receiving portion 13 having an outer diameter slightly larger than the outer diameter of the male-side body portion 14 at one end of the male-side body portion 14 having a bent portion and a linear portion. Is formed. A cylindrical male flange 12 is formed adjacent to the end of the fastener receiving portion 13. The male flange 12 has an outer diameter larger than the outer diameter of the fastener receiving portion 13 and an axial width thinner than the fastener receiving portion 13. Further, on the opposite side of the male flange 12 from the fastener receiving portion 13, a male side connecting cylinder portion 10 having an outer diameter the same as that of the male side trunk portion 14 is formed. A root portion radial recess 11, which is a groove having a diameter smaller than the outer diameter of the male connection tube portion 10, is formed in the circumferential direction at the root portion of the male flange 12 of the male connection tube portion 10. Reference numeral 15 denotes a flange joint surface, which will be described in detail later.

  The fastener receiving portion 13 is a portion for connecting the connection pipes with a fastener (not shown). However, in the present embodiment, the fastener receiving portion 13 is not used, and thus it may be omitted.

  The opposite end of the L-shaped male fluid coupling 1 may be formed with the male flange 12, the male connecting cylinder 10, and the root radial recess 11 described above. It may be a shape for connection.

FIG. 2 shows a T-shaped female fluid coupling (female side connecting pipe) 2 that is a joint having a branching portion. Similar to the L-shaped male fluid coupling 1, the T-shaped female fluid coupling 2 is formed of PPS which is a thermoplastic synthetic resin.
In addition, in the said Example, although the L-shaped male side fluid coupling 1 and the T-shaped female side fluid coupling 2 are formed with PPS, not only this but ABS (acrylonitrile butadiene styrene) melting | fusing point 100 to 125 degree | times, PC (polycarbonate) melting point 150 degrees, POM (polyoxymethylene) melting point 181 degrees, PMMA (polymethyl methacrylate) melting point 90 to 105 degrees, PP (polypyrene) melting point 168 degrees, or PBT (polybutylene terephthalate) melting point 232 to 267 degrees May be used.

  In the T-shaped female fluid coupling 2, connection portions for connecting to other joints are formed at both ends of the linear female body barrel 24, and a branch portion and an end thereof are connected to the outer periphery of the female body barrel 24. The part is formed.

  A cylindrical fastener receiving portion 23 having a large outer diameter of the female side trunk portion 24 is formed on one end side of the female side barrel portion 24, and the outer diameter of the fastener receiving portion 23 is larger than that of the fastener receiving portion 23. A large female flange 22 is also formed. The female flange 22 is cylindrical and has an axial width that is narrower than the width of the fastener receiving portion 23. On the inner wall surface of the fastener receiving portion 23 and the female side flange 22, the female side in-tube connecting portion 21 having an inner diameter that is larger than the inner diameter of the female side barrel portion 24 and slightly larger than the outer diameter of the male side connecting cylinder portion 10. Is formed. In addition, although 25 is a flange joint surface, the detail is mentioned later.

  Like the L-shaped male fluid coupling 1, the fastener receiving portion 23 may or may not be present. Further, the structure of the other end may be the structure described above or a different structure. An example of a different structure will be briefly described with reference to FIG.

  An O-ring (not shown) is fitted into an O-ring insertion groove 26 formed in a cylindrical connection portion provided at the tip of the male connection pipe flange on one end side of the T-type female fluid coupling 2 shown in FIG. A cylindrical connecting portion is inserted into the female pipe connecting portion of the other joint to be connected, and is held by a quick fastener member (not shown) over the entire circumference of the flange.

  However, because it is attached with a detachable sliding structure, there is a slight gap, so there is a slight gap between the sealing surface of the connection and the molding surface roughness of the connection sealing surface. It is a structure that may cause defects. In addition, since complex mixing pipes and branch pipes are joined by joining stainless steel pipes and copper pipes as connection pipe joints by TIG welding and brazing, the assembly is troublesome in addition to the material unit price. There was also a problem that the manufacturing unit price was high.

  Next, as shown in FIG. 4, the flange-connecting surface 15 of the L-shaped male fluid coupling 1 and the flange-connecting surface 25 of the T-shaped female fluid coupling 2 are opposed to each other so that the male-side connecting tube portion 10 The fluid coupling 3 shown in FIG. 3 is obtained by fitting into the in-pipe connection portion 21. At this time, it is inserted so that both flange joint surfaces 15 and 25 are in surface contact. In this state, since both hands are not touched, both are easily separated.

  FIG. 5 is a diagram in which the fluid coupling 3 shown in FIG. 1 is rotated 90 degrees clockwise around the tube axis of the T-shaped female fluid coupling 2. FIG. 6 shows the AA cross section. In addition, although the fluid coupling 3 shown in FIG. 1 has shown the state to which the L type male side fluid coupling 1 and the T type female side fluid coupling 2 were adhere | attached, FIG. 5 is an unbonded state.

  Referring to the cross-sectional view of FIG. 6, it can be seen that the joint surfaces of the male flange 12 and the female flange 22 having substantially the same diameter are in surface contact with each other. And it turns out that the root part radial direction recessed part 11 of the L-shaped male side fluid coupling 1 exists in the radial inside of the female side flange 22 as space. Moreover, since the axial length of the male side connection cylinder part 10 including the root part radial direction recessed part 11 is formed slightly shorter than the axial direction length of the female side in-tube connection part 21, the axial gap 30 appears. I understand that

  Next, a method for bonding the L-shaped male fluid coupling 1 and the T-shaped female fluid coupling 2 will be described.

  In FIG. 7, heat is applied to the flange joint surface 15 of the male flange 12 of the L-shaped male fluid joint 1 and the flange joint surface 25 of the female flange 22 of the T-shaped female fluid joint 2 to melt them. The L-shaped male fluid coupling 1 is fitted to the L-shaped male fluid coupling 1 and the T-shaped female fluid coupling 2 so that the flange joint surfaces 15 and 25 are in close contact with each other, and pressure is further applied to the flange joint surfaces 15 and 25. And the T-shaped female fluid coupling 2 are pressed together (one may be stationary and the other pressed against one).

  FIG. 8 shows a cross-sectional view in which the L-shaped male fluid coupling 1 and the T-shaped female fluid coupling 2 are thermally welded through such a process. As a result of pressing and holding in the pressing direction for a certain period of time, the molten resin that protrudes in the pipe inner circumferential direction flows into the root radial recess 11 described with reference to FIG. 6, and the root radial recess 11 is filled to form the elution fitting portion 32. The The resin that has flowed into the root radial recess 11 is considered to be mainly the resin on the inner surface of the female flange 22.

  Further, the flange joining surfaces 15 and 25 are bonded together to form the welding surface 31.

  The effects of the elution fitting portion 32 and the welding surface 31 will be described. Since the elution fitting portion 32 is formed by the resin of the T-shaped female fluid coupling 2 flowing into the radial recess 11 of the root portion of the L-shaped male fluid coupling 1, the elution fitting portion 32 is formed by cooling and solidifying. , A claw-like one formed over the entire circumference of the inner surface of the female flange 22 of the T-shaped female fluid coupling 2. Since the claw-like elution fitting part 32 formed over the entire inner circumference bites into the root part radial recess 11 of the L-shaped male fluid coupling 1, the L-shaped male fluid coupling 1 and the T-shaped female side The tensile strength, which is the strength in the direction in which the fluid coupling 2 is pulled, is increased.

  On the other hand, since the surfaces of the flange joint surfaces 15 and 25 are bonded to each other by welding, for example, when the joint 3 is used for piping of a water heater, water or hot water flows using the inside of the tube as a fluid. Even if it is going to leak beyond the elution fitting part 32, since the welding surface 31 is surface-bonded, leakage of the fluid inside is prevented. The same applies when the fluid is a gas.

  Further, since the bead generated on the inner surface of the pipe of the joint shown in the prior art does not occur, in other words, since the conventional bead is used as the elution fitting part 32, the pipe is used when used as the hot water supply pipe. The accumulation of liquid and bubbles generated by the inner beads are suppressed.

  Next, a heat welding apparatus for realizing this welding will be described with reference to FIG. The left side of the drawing is the L-shaped male fluid coupling 1, and the right side is the T-shaped female fluid coupling 2. These are respectively fixed to work clamps 54 and 53 that can move in the left-right direction on the paper surface. The heating plate 50 is for melting the flange joint surfaces 15 and 25 of the both, and is provided with a relief hole 55 for escaping the male connection cylinder portion 10 of the L-shaped male fluid coupling 1. Heaters 51 and 52 are provided. The heaters 51 and 52 have an amount of heat that melts the flange joint surfaces 15 and 25 in a predetermined time by releasing heat from the heating plate 50.

  The workpiece clamps 53 and 54 hold the joints at positions separated from each other, the heating plate 50 heated to a predetermined temperature in advance is moved to the position shown in FIG. 9, and the workpiece clamps 53 and 54 are moved to the position shown in FIG. To start heating. Heating is performed without contact with the heating plate 50. When heated for a predetermined time, the flange joint surfaces 15 and 25 are melted to form molten resin portions 120 and 220 as shown. Next, the work clamps 53 and 54 are separated from each other, the heating plate 50 is retracted, and the work clamps 53 and 54 are brought close to each other until the molten resin portions 120 and 220 come into contact with each other. Further, the work clamps 53 and 54 are pressurized for a predetermined time with a predetermined pressing amount in the pressing direction. By this pressurization, the welding surface 31 and the elution fitting portion 32 are formed as described above. Thereafter, the L-shaped male fluid coupling 1 and the T-shaped female fluid coupling 2 which are the joints 3 are removed from the work clamps 53 and 54, and the process is completed.

  The molten resin melted by pressurizing the molten resin portions 120 and 220 flows into the root portion radial recess 11 and the elution fitting portion 32 is formed. The relationship between the molten resin and the size of the groove is the fracture strength. It has been confirmed by experiments that it is related to (pressure when the fluid coupling is closed and broken by applying water pressure).

  The fracture strength is determined by the amount of the resin from the molten resin portions 120 and 220 flowing into the root portion radial recess 11. It is considered that the fracture strength is increased when the molten resin enters the groove bottom in the depth direction of the groove instead of the width of the groove in the tube axis direction of the root portion radial recess 11. Originally, it is only necessary to calculate the volume of the concave portion 11 (groove) in the radial direction of the root portion. However, the volume of the groove is calculated by multiplying the area of the wall of the groove (this is multiplied by the length of the groove in the tube axis direction). The relationship between the ratio of the resin part to the cross-sectional area when the male side connecting cylinder part 10 was cut in the radial direction and the fracture strength was calculated by experiment.

  According to the experiment, the ratio of the cross-sectional area of the groove wall to the cross-sectional area of the resin part when the male side connecting cylinder part 10 is cut in the radial direction is in the range of 15% to 50%, preferably 15% to 45%. It has been found that a fracture strength having a sufficient margin with respect to the water pressure used at least in the water heater can be obtained satisfactorily.

  This is because the root portion radial recess 11 (groove) is too deep, that is, if the ratio is larger than 50%, the molten resin does not reach the deepest portion of the groove and a void-like space is generated. On the contrary, if the groove is too shallow, the amount of resin in the elution fitting portion 32 is considered to be small.

  In the embodiment described above, the L-shaped male fluid coupling 1 is configured by providing the male joint (the male flange 12, the root radial recess 11, and the male connecting cylinder 10) on the L fluid joint. The T-shaped female fluid coupling 2 is constructed by providing the T-shaped fluid coupling with the female joint (female side flange 22, female-side pipe connecting portion 21). It is not necessary to stick to this embodiment, and this embodiment can be applied to any fluid coupling.

  Further, although the root portion radial recess 11 is provided so as to contact the flange joint surface 15, it may be provided at a distance from the flange joint surface 15. In this case, the molten resin melted from the inner surface of the female flange 22 is somewhat deteriorated. Furthermore, although the root part radial direction recessed part 11 was provided over the perimeter of the male side connection cylinder part 10, the part of the same diameter as the male side connection cylinder part 10 in the circumferential direction does not need to be the whole circumference. There may be.

  In addition, this invention is not limited to an above-described Example, Various modifications are included. For example, the above-described embodiments have been described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the configurations described.

  DESCRIPTION OF SYMBOLS 1 ... L type male side fluid coupling (male side connection piping), 2 ... T type female side fluid coupling (female side connection piping), 3 ... Joint, 10 ... Male side connection cylinder part, 11 ... Root part radial direction recessed part, DESCRIPTION OF SYMBOLS 12 ... Male side flange, 15 ... Flange joint surface, 21 ... Female side pipe inner connection part, 22 ... Female side flange, 25 ... Flange joint surface, 31 ... Welding surface, 32 ... Elution fitting part

Claims (1)

A flange having a diameter larger than that of the trunk formed on the end of the trunk, a male connecting cylinder formed at the end of the flange and having a smaller diameter than the flange, and a male connecting cylinder of the male connecting cylinder A male side fluid coupling made of thermoplastic synthetic resin having a root portion radial recess formed in the circumferential direction so as to be smaller in diameter than the male connection tube portion formed on the root side of the flange, and an end portion of the trunk portion A female-side fluid coupling made of a thermoplastic synthetic resin having a flange having a diameter larger than that of the body portion and a female-side pipe connecting portion whose inner diameter is larger than the outer diameter of the male-side connecting cylinder portion; The flange of the male fluid coupling and the flange of the female fluid joint are thermally welded with the male connection cylinder fitted to the connection, and the female fluid is in the root radial recess. A joint that contains a part of the resin of the joint.

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