JP5957194B2 - Pipe joint with heat insulation layer and method for producing the same - Google Patents

Description

  The present invention relates to a pipe joint with a heat insulating layer and a method for producing the same. More specifically, the present invention relates to a pipe joint with a heat insulating layer used for a joint portion of a pipe line that requires heat insulation, and a method for manufacturing the pipe joint.

  A pipe joint is used to connect a pipe member and the pipe member to form a pipe line. The pipe members and pipe joints described above are made of resin.

  Some of the pipes described above require heat insulation. As a pipe line that requires heat insulation, a pipe line (water supply pipe or drain pipe) for water supply or drainage can be considered. For example, in the case of a drain pipe for air conditioning equipment, which is a pipe for drainage, in order to prevent condensation, the entire drain pipe is covered with a heat insulating material such as glass wool from the outside so that heat insulation is performed. .

  However, when the entire drain pipe is covered with a heat insulating material from the outside, problems such as considerable work and maintenance are caused.

  Then, the pipe joint with a heat insulation layer which eliminated the need to cover with a heat insulating material is proposed by the applicant of this application (for example, refer patent document 1).

  As shown in FIGS. 5 and 6, such a pipe joint 1 with a heat insulating layer is formed by injecting a non-foamable resin 4 in an amount smaller than the volume of the cavity space 3 provided in the molding die 2 into the injection portion 5 (injection port). ) (Short shot injection), and when the surface of the non-foamable resin 4 is solidified to some extent inside the cavity space 3, the foamable resin 6 is injected from the same injection portion 5 and further pressurized, The foaming pressure of the foamable resin 6 allows the non-foamable resin 4 to reach every corner of the cavity space 3, and the foamable resin 6 foams the heat insulating material layer (foamed) inside the wall of the non-foamable resin 4. It is manufactured so as to form a functional resin 6).

  By doing in this way, as shown in FIG.7 and FIG.8, the short tubular joint main body 7 which has a heat insulating material layer in the thickness inside, and the short tubular integrally formed in the opening end part of the joint main body 7 The pipe joint 1 with a heat insulating layer having the receiving portion 8 is formed.

Patent No. 3699579

  However, the pipe joint 1 with a heat insulating layer has the following problems.

  That is, at the time of injection molding, if there is a joining portion 9 where the non-foamable resin 4 joins inside the cavity space 3, the flow of the non-foamable resin 4 stops at the joining portion 9 and solidifies (so-called weld). There is a problem that the foamable resin 6 cannot enter the vicinity of the junction 9 and a missing portion is generated in the heat insulating material layer.

  In the case of the pipe joint 1 with a heat insulating layer, the joining part 9 of the non-foamable resin 4 described above is located at a position away from the injection part 5 in the joint body 7, for example, a position opposite to the injection part 5. Tend to occur. This is because the non-foamable resin 4 injected into the joint main body 7 from the injection part 5 is divided into two along the peripheral wall of the joint main body 7, and is substantially half-turned in the opposite direction, and then the injection part 5 This may be due to rejoining at the opposite position.

In order to solve the above-mentioned problem, the invention of claim 1 includes a short tubular joint body, and a short tubular receiving portion formed integrally with an opening end of the joint body, and the joint body and In the pipe joint with a heat insulating layer , the receiving portion is mainly composed of a non-foamable resin, and a heat-insulating material layer made of the foamable resin is enclosed in the wall thickness of the non-foamable resin constituting the joint body. there are, the joint body, exhibits a Y cheese shape having a branch pipe portion which is branched obliquely from the main pipe and the main pipe section, on a plane passing through the axes of the branch pipe portion of the main pipe, the branch pipe It has the part which the said foamable resin has exposed in the position in which a branch pipe part and a main pipe part cross | intersect an obtuse angle.

The invention of claim 2 has a short tubular joint body and a short tubular receiving part integrally formed at the opening end of the joint body, and the joint body and the receiving part are non-foaming. with mainly composed of a resin, a the joint non-foaming insulation layer-fitting the heat insulating material layer is enclosed by the wall thickness inside the expandable resin of the resin constituting the main body, the joint body, The branch pipe part and the main pipe in the branch pipe part on a plane passing through the axis of the main pipe part and the axis of the branch pipe part have a Y cheese shape having a main pipe part and a branch pipe part obliquely branched from the main pipe part A portion where the foamable resin is exposed at a position where the portion intersects an obtuse angle, and the non-foamable resin is composed of a transparent resin or a translucent resin having light transmittance It is characterized by that.

The invention according to claim 3 is characterized in that the width dimension of the exposed portion of the foamable resin with respect to the joint body is set to 1 mm or more and 4 mm or less.

The invention of claim 4 is characterized in that the portion where the foamable resin is exposed is provided in a state of being offset to one side with respect to a plane passing through the axis of the main pipe and the axis of the branch pipe. And

The invention of claim 5 injects a non-foamable resin in an amount smaller than the volume of the cavity space provided in the molding die from the injection portion into the cavity space, and the surface of the non-foamable resin is inside the cavity space. When solidified to some extent, by injecting foaming resin from the same injection part and further pressurizing, the foaming pressure of the foaming resin spreads the non-foaming resin to every corner of the cavity space and foaming A heat insulating material layer is formed inside the non-foamable resin by foaming of a resin, and a short tubular joint body having the heat insulating material layer, and a heat insulating material layer integrally formed at the opening end of the joint body the method of manufacturing a heat-insulating layer-fitting for forming a heat insulating layer with pipe joint according to any one of claims 1 to 4 and a socket portion of the short tubular without,
The branch pipe part and the main pipe part in the branch pipe part intersect at an obtuse angle in the cavity space for forming the Y cheese-shaped joint body having the main pipe part and the branch pipe part obliquely branched from the main pipe part. A space for molding a resin escape portion formed by escaping the non-foamable resin from the portion to the outside of the joint body is provided, and the non-foamable resin injected from the injection portion is joined at the time of injection molding Alternatively, the non-foamable resin and the foamable resin are allowed to escape to an external resin escape portion located in the vicinity thereof, thereby forming a heat insulating material layer made of the foamable resin in a state where the non-foamable resin joining portion has no missing portion. together, molding the resin relief portion to the joint body and integral, by cutting the resin relief portion after the injection molding, and forming a cutting marks foamable resin is exposed.

According to invention of Claim 1, the following effects can be acquired by the said structure. That is, it has a short tubular joint body and a short tubular receiving part integrally formed at the opening end of the joint body, and the joint body and the receiving part are mainly composed of non-foamable resin. In addition, a pipe joint with a heat insulating layer in which a heat insulating material layer made of a foamable resin is sealed inside the wall thickness of the non-foamable resin constituting the joint main body, the joint main body being inclined from the main pipe portion and the main pipe portion. In a Y cheese shape having a branched branch pipe part, on a plane passing through the axis of the main pipe part and the axis of the branch pipe part, the branch pipe part and the main pipe part intersect at an obtuse angle in the branch pipe part. By having the portion where the foamable resin is exposed, it is possible to obtain a Y cheese-shaped pipe joint with a heat insulating layer having a heat insulating material layer without a missing portion inside the wall thickness of the joint main body.

  According to invention of Claim 2, the following effects can be acquired by the said structure. That is, by configuring the non-foamable resin with a transparent resin or a translucent resin having light transmittance, the state of the heat insulating material layer formed inside the wall thickness of the joint body can be easily confirmed visually from the outside. it can. In addition, the insertion state, adhesion, bonding state, and the like of the tube member with respect to the light-receiving port portion can be easily confirmed from the outside.

According to invention of Claim 3, the following effects can be acquired by the said structure. That is, the width of the portion foamable resin against the fitting body is exposed, by the 1mm or 4mm or less, it is possible to escape effectively non-foaming resin from the joint body to the outside, outside the joint body The portion where the foamable resin is exposed can be made inconspicuous while preventing the non-foamable resin and foamable resin from escaping more than necessary.

According to invention of Claim 4, the following effects can be acquired by the said structure. That is, the part where the foamable resin is exposed is provided in a state of being offset toward one side with respect to the plane passing through the axis of the main pipe and the axis of the branch pipe , thereby simplifying the structure of the molding die. Can be

According to the invention of claim 5, the same effect as that of claims 1 to 4 can be obtained by the above configuration.

It is a side view which shows the pipe joint with a heat insulation layer concerning the Example of this invention, and its manufacturing method. It is sectional drawing of the II-II arrow direction of FIG. It is the schematic which looked at the pipe joint with a heat insulation layer manufactured with the manufacturing method of FIG. 1 from the arrow III direction. FIG. 3 is a cross-sectional view of FIG. 3 broken at the same position as FIG. 2. It is a side view which shows the pipe joint with a heat insulation layer concerning the prior art example, and its manufacturing method. It is sectional drawing of the VI-VI arrow direction of FIG. It is the schematic which looked at the pipe joint with a heat insulation layer manufactured with the manufacturing method of FIG. 5 from the arrow VII direction. It is sectional drawing which fractured | ruptured FIG. 7 in the same position as FIG.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments embodying the present invention will be described below in detail with reference to the drawings.

  1 to 4 show this embodiment.

  <Configuration> The configuration will be described below.

  A pipe line is constituted by connecting a resin pipe member and a resin pipe member using a resin pipe joint.

  And it is made for the above-mentioned pipe line to have heat insulation as needed with respect to the pipe line (water supply piping or drainage piping) for performing water supply, drainage, etc. For example, heat insulation measures are taken to prevent condensation on a drain pipe of an air conditioner, which is a pipe for drainage. Therefore, a pipe member with a heat insulation layer (not shown) and a pipe joint 21 with a heat insulation layer are used. The above-described tube member with a heat insulating layer and the pipe joint 21 with a heat insulating layer have a heat insulating layer inside the wall.

  Of these, the pipe joint 21 with a heat insulating layer described above, as shown in FIG. 1 and FIG. 2, injects the non-foamable resin 24 in an amount smaller than the volume of the cavity space 23 provided in the molding die 22. When the surface of the non-foamable resin 24 is hardened to some extent inside the cavity space 23, the foamable resin 26 is injected from the same injection portion 25 and further pressurized. The foaming pressure of the foamable resin 26 spreads the non-foamable resin 24 to every corner inside the cavity space 23, and the foamable resin 26 foams the heat insulating material layer ( The foamable resin 26) is produced (or entrapped).

  By doing in this way, as shown in FIGS. 3 and 4, it has a short tubular joint body 27 and a short tubular receiving portion 28 formed integrally with the opening end of the joint body 27, The joint body 27 and the receiving portion 28 are mainly composed of the non-foamable resin 24, and a heat insulating material formed by foaming the foamable resin 26 inside the wall of the non-foamable resin 24 constituting the joint body 27. The pipe joint 21 with the heat insulating layer in which the layer is sealed (or the foamable resin 26 is sandwiched by the non-foamable resin 24) is formed.

  In such a pipe joint 21 with a heat insulating layer, the injection part 25 of the non-foamable resin 24 and the foamable resin 26 described above is formed in the joint body 27. Then, the joining portion 29 of the non-foamable resin 24 is formed at a position away from the injection portion 25 of the joint body 27 (for example, a position on the joint body 27 opposite to the injection portion 25). .

  In addition, about the above-mentioned pipe member with a heat insulation layer, it manufactures by the method similar to the above-mentioned pipe joint 21 with a heat insulation layer.

  Here, a supplementary explanation of the above will be given.

  First, in the “pipe joint”, an I-type joint (straight joint) that connects two pipe members in a straight line, and an L-type joint (flexible joint, so-called “joint”) that connects two pipe members in a bent state. Elbows) and T-type and Y-type joints (branch joints or junction joints, so-called cheeses) that connect three or more pipe members simultaneously exist. In this embodiment, any of these may be used, but a Y-type joint is most suitable as will be described later.

  The “joint body 27” described above has an inner diameter substantially equal to the inner diameter of the pipe member.

  The “receiving port 28” described above is for inserting and connecting the pipe member, and has an inner diameter substantially equal to the outer diameter of the pipe member. A stop surface (not shown) in which the end of the tube member directly abuts or indirectly abuts via a seal member such as a packing is provided in the inner back portion of the receiving portion 28. The receiving portion 28 is formed concentrically with the opening end portion of the joint body 27. In general, the outer diameter of the receiving portion 28 is larger than the outer diameter of the joint body 27, and the difference in diameter between the receiving portion 28 and the joint body 27 is absorbed. Step portions are provided. The above-described stop surface is formed on the inner surface side of the step portion. However, structurally, the outer diameter of the receiving portion 28 and the outer diameter of the joint body 27 can be the same so that the stepped portion described above does not occur on the outer surface. It is ideal that the heat insulating material layer does not enter the interior of the receiving portion 28 at all.

  The “injection part 25” described above is an injection port (or a trace thereof) for injecting and injecting the non-foamable resin 24 and the foamable resin 26 into the molding die 22 (in the cavity space 23) during injection molding. One place or a plurality of places can be provided. In this case, the injection part 25 is made into one place.

  The “merging portion 29” described above is a portion where the flow of the non-foamable resin 24 merges inside the cavity space 23 at the time of injection molding. The non-foamable resin 24 merges and is solidified in a stopped state. As a result, traces (joint traces) generally called a weld line or the like are formed. When the injection portion 25 is only one place, the above-described joining portion 29 is formed by joining again the non-foamable resin 24 that has been split into two or more in the cavity space 23 at the time of injection molding. Is done. Further, when a plurality of injection portions 25 are provided, in addition to the above, the non-foamable resin 24 from different injection portions 25 joins at the middle point or the vicinity thereof. In this case, the former is mainly used.

  As a more specific configuration, in the case of the pipe joint 21 with a heat insulating layer according to this embodiment, for example, the injection portion 25 is provided substantially in the radial direction with respect to the joint body 27. The junction portion 29 is formed at a position away from the injection portion 5 of the joint body 27, for example, at a position opposite to the injection portion 25 (position approximately 180 degrees away). This is because the non-foamable resin 24 injected from the injection part 25 into the joint main body 27 is divided into two along the peripheral wall of the joint main body 27 and substantially half a turn in the opposite direction, This may be due to rejoining at the opposite position.

  Further, when the pipe joint 21 with a heat insulating layer is molded, it is necessary to optimally set the injection amount and injection pressure of the non-foamable resin 24 and the foamable resin 26, the foaming degree and the pressurization amount of the foamable resin 26, and the like. There is. These settings are determined by experience values.

  In addition, it is preferable to set the flow ratios from the injection part 25 to the receiving parts 28 to be substantially equal to each other. This flow ratio R is expressed by the equation R = L / t, where L is the distance from the injection part 25 to each receiving part 28 and t is the thickness of the part. For example, as shown in FIG. 1, when the pipe joint 21 with a heat insulating layer has three receiving portions 28 (hereinafter, distinguished as receiving portions 28a, 28b, and 28c), the respective flow ratios are R1 = L1 / T1 (in the case of the receiving portion 28a), R2 = L2 / t2 (in the case of the receiving portion 28b), R3 = L3 / t3 (in the case of the receiving portion 28c) (only L1, L2, and L3 are shown) Shown). Here, R1 and R2 are main pipe flow ratios, and R3 is a branch pipe flow ratio. The value of the flow ratio R (R1, R2, R3) is most preferably set to 1, but it is not limited to this because it can be substantially injected.

  In order to allow even a slight dimensional error, the values of the flow ratios such as R1 / R2, R1 / R3, and R2 / R3 are approximately 0.9 to 1.. Set to be within the range of 1.

  For example, by setting L1 = L2 = L3 = constant and t1 = t2 = t3 = constant, the above range can be satisfied. As an example, when the diameter of the pipe member is 40 mm, for example, L1 = L2 = L3 = 60 mm, t1 = t2 = t3 = 10 mm, and the like.

  For example, when L1 = L2 <L3, t1 = t2 <t3 is satisfied so that the above range is satisfied. As an example, when L1 = L2 = 35 mm and L3 = 65 mm, t1 = t2 = 10 mm, t3 = 20 mm, and the like.

  In order to set L1 = L2, the injection part 25 may be set at a position where the distance between the receiving part 28a and the receiving part 28b is divided into two equal parts.

  By doing in this way, the non-foamable resin 24 and the foamable resin 26 are evenly supplied to the respective receiving portions 28 (receiving portions 28a, 28b, 28c), or the receiving portions 28 are expanded. Since the resin 26 is prevented from invading, the short tubular joint body 27 having a heat insulating material layer inside the wall as described above, and the short formed integrally with the opening end of the joint body 27 are provided. It becomes possible to shape | mold the pipe joint 21 with a heat insulation layer which has a tubular receiving part 28. FIG.

  However, the pipe joint 21 with a heat insulating layer is not limited to the above-described dimensions.

  As described above, when the joining portion 29 where the non-foamable resin 24 joins exists in the cavity space 23 during the injection molding of the pipe joint 21 with the heat insulating layer, the non-foamable resin 24 is formed at the joint portion 29. When the flow of the resin stops and hardens (a so-called weld line is generated), the foamable resin 26 cannot enter the periphery of the joining portion 29, and there is a possibility that a missing portion is generated in the heat insulating material layer. Therefore, in this embodiment, the above-described problem can be dealt with by adopting the following configuration.

(Configuration 1)
A resin escape portion 35 formed by escaping the non-foamable resin 24 to the outside of the joint body 27 is formed at or near the junction portion 29 described above, and the resin escape portion 35 is excised (cut and removed) after the formation. The mark 36 is provided.

Here, the resin escape portion 35 described above has a space portion 23b for forming the resin escape portion 35 inside the molding die 22 separately from the space portion 23a for forming the pipe joint 21 with the heat insulating layer. By being provided, it is formed integrally with the pipe joint 21 with a heat insulating layer. The excision mark 36 is a portion where the foamable resin is exposed.

(Configuration 2)
The non-foamable resin 24 described above is made of a transparent resin or a translucent resin having light transmittance.

  The foamable resin 26 is preferably the same resin as the non-foamable resin 24, but any other transparent resin, translucent resin, or opaque resin may be used. However, even when a transparent resin or a semi-transparent resin is used for the foamable resin 26, the foamable resin 26 has a certain degree of light shielding property due to the bubbles refracting light.

  Thereby, as for the pipe joint 21 with a heat insulation layer, while the joint main body 27 has a certain amount of light-shielding property by the heat insulating material layer as a whole, the receptacle part 28 has a light transmittance.

  More specifically, for example, the non-foamable resin 24 includes polyvinyl chloride, ABS (acrylonitrile-butadiene-styrene) resin, AES (acrylonitrile-EPDM (ethylene-propylene rubber) -styrene) resin, polyethylene, polypropylene, A resin such as an acrylic resin can be used. As the foamable resin 26, a resin obtained by mixing azodicarbonamide (AZ-HM manufactured by Otsuka Chemical Co., Ltd.) as a foaming agent with polyvinyl chloride, ABS resin, or the like can be used.

(Configuration 3)
The width dimension of the excision mark 36 of the resin escape portion 35 with respect to the joint body 27 is set to 1 mm or more and 4 mm or less.

  Here, the above-described excision mark 36 becomes a passage (exit part) such as the non-foamable resin 24 from the joint body 27 to the resin escape portion 35 during injection molding, and before cutting after the injection molding, This is a connecting portion or a connecting portion between the main body 27 and the resin escape portion 35. Then, the excision marks 36 are made uniform in width. The excision mark 36 (exit part such as the non-foamable resin 24) is optimally set between 1 mm which is the minimum width and 4 mm which is the maximum width.

(Configuration 4)
The resin escape portion 35 is formed so as to be offset to one side with respect to the junction portion 29.

  That is, when the joint body 27 is substantially bisected in the axial direction along the line connecting the merging portion 29 and the injection portion 25, most of the resin escape portion 35 is formed on the side of one divided piece. To.

(Configuration 5)
Preferably, the above-described joint main body 27 has a Y cheese shape having a main pipe portion 41 and a branch pipe portion 42 branched obliquely from the main pipe portion 41. Then, the injection part 25 is provided at a position on the opposite side of the branch pipe part 42 in the main pipe part 41 on a plane passing through the axis 41 a of the main pipe part 41 and the axis 42 a of the branch pipe part 42. In addition, on the plane described above, the resin escape portion 35 is provided at a portion of the branch pipe portion 42 where the branch pipe portion 42 and the main pipe portion 41 intersect the obtuse angle 43.
At this time, by exposing the foamable resin 26 to the excision marks 36, a heat insulating material layer made of the foamable resin 26 is formed in a state where there is no missing portion in the joining portion 29 of the non-foamable resin 24.

  Here, the main pipe part 41 and the branch pipe part 42 are, for example, those that branch so that the acute angle side is 45 degrees and the obtuse angle 43 side is 135 degrees (so-called 45-degree branch cheese). However, the branch angle between the main pipe portion 41 and the branch pipe portion 42 is not limited to 45 degrees.

(Configuration 6)
In order to form the Y cheese-shaped joint body 27 having the main pipe portion 41 and the branch pipe portion 42 that is branched obliquely from the main pipe portion 41 in addition to the above-described manufacturing steps as a manufacturing method of the pipe joint 21 with a heat insulating layer described above. In the cavity space 23, a resin escape portion 35 is formed by allowing the non-foamable resin 24 to escape from the portion of the branch pipe portion 42 where the branch pipe portion 42 and the main pipe portion 41 intersect at an obtuse angle to the outside of the joint body 27. may be provided a space portion 23b for, at the time of injection molding, it was injected from the injection unit 25 non-effervescent merging section 29 resin 24 is merged or to the outside of the resin relief portion 35 located near the non-foaming resin by releasing the 24 and foamable resin 26, thereby forming a heat insulating material layer of the foamable resin 26 in the absence of missing parts in the confluent portion 29 of the non-foaming resin 24, integrally with the joint main body 27 Molding the fat escape portion 35, by cutting the resin relief portion 35 after the injection molding, so as to form a cutting mark 36 which foamable resin 26 is exposed.

  <Operation> The operation of this embodiment will be described below.

  First, manufacture of the pipe joint 21 with a heat insulation layer is demonstrated.

  As already described above, an amount of non-foamable resin 24 smaller than the volume of the cavity space 23 provided in the molding die 22 is injected into the cavity space 23 from the injection portion 25 (injection port) (short shot injection). . Then, when the surface of the non-foamable resin 24 is solidified to some extent inside the cavity space 23, the foamable resin 26 is injected from the same injection portion 25 and further pressurized. Thereby, the non-foamable resin 24 is spread to every corner inside the cavity space 23 by the foaming pressure of the foamable resin 26, and the heat insulating material is formed inside the non-foamable resin 24 by the foaming of the foamable resin 26. A layer (foamable resin 26) is formed (triggered).

  By doing in this way, it has the short tubular joint main body 27, and the short tubular receiving part 28 formed integrally at the opening end of the joint main body 27, and the joint main body 27 and the receiving part 28 are The heat insulating material layer formed by foaming the foamable resin 26 is enclosed in the inside of the thickness of the non-foamable resin 24 constituting the joint body 27 (non-foamable resin). The pipe joint 21 with a heat insulating layer is formed, in which the foamable resin 26 is sandwiched by 24).

  At this time, in the cavity space 23, space portions 23a and 23b for forming a resin escape portion 35 formed by escaping the non-foamable resin 24 to the outside of the joint body 27 are provided. At the time of injection molding, at least the non-foamable resin 24 is allowed to escape from the merging portion 29 where the non-foamable resin 24 injected from the injection portion 25 is merged or the vicinity thereof to the external resin escape portion 35, whereby the joint main body 27. The resin escape portion 35 is molded integrally with the above. Further, the resin escape portion 35 described above is cut off after the injection molding.

  In this way, the resin escape portion 35 formed by escaping the non-foamable resin 24 to the outside of the joint main body 27 is formed at or near the junction 29 described above, and the cut mark 36 formed by cutting after the formation is formed. The pipe joint 21 with a heat insulating layer is formed.

  Next, construction of a pipeline that requires heat insulation, such as a pipeline for water supply or drainage, will be described.

  For example, in order to construct a pipe line that requires heat insulation such as a drain pipe line of an air conditioner, a pipe member with a heat insulating layer made of resin and a pipe joint 21 with a heat insulating layer made of resin are used. And after apply | coating an adhesive agent (colored adhesive etc.) to the inner peripheral surface of the receiving part 28 of the pipe joint 21 with a heat insulation layer, and the outer peripheral surface of the edge part of a pipe member with a heat insulation layer, respectively. The pipe member with a heat insulating layer and the pipe joint 21 with a heat insulating layer are bonded and bonded by fitting both together. By performing this over the entire pipeline, a pipeline with heat insulation is constructed.

  Such a heat-insulating pipe line has heat insulation by a heat insulation layer provided inside itself without constructing heat insulation material such as glass wool outside, so that heat insulation material is externally provided at the time of construction. It is possible to reduce the time and labor of installing the heat insulation and the time for removing the heat insulating material during maintenance.

  In addition, about the receptacle part 28 of the pipe joint 21 with a heat insulation layer, heat insulation is ensured by the synergistic effect of the heat insulation layer of the pipe member with a heat insulation layer inserted and fixed, and the thickness of the receptacle part 28.

  <Effect> According to this embodiment, the following effects can be obtained.

(Operation effect 1)
With the configuration 1, the following operational effects can be obtained. That is, the non-foamable resin 24 is released from the joint portion 29 or the vicinity thereof to the outside of the joint body 27 and the resin escape portion 35 is formed integrally with the joint body 27. It is possible to prevent the flow from stopping and solidifying. Thereby, it is possible to prevent the foamable resin 26 from entering the vicinity of the merging portion 29 and causing a missing portion in the heat insulating material layer. That is, the flow of the non-foamable resin 24 stops at the joining portion 29 and does not harden as it is, but flows toward the resin escape portion 35, so that a flow mark is generated at the joining portion 29. In addition, the foamable resin 26 can enter the vicinity of the merge portion 29, and thus a heat insulating material layer having no missing portion is formed in the merge portion 29 of the non-foamable resin 24 in the joint body 27. Is possible. Thereby, for example, when a low-temperature fluid is flowed, it is possible to prevent dew condensation from occurring in the missing portion of the heat insulating material layer.

  Then, the resin escape portion 35 is cut off from the joint body 27 after injection molding, so that the resin escape portion 35 is not attached to the outside, and a heat insulating material layer having no missing portion is provided inside the wall thickness of the joint body 27. The layered pipe joint 21 can be obtained.

  At this time, bubbles of the foamable resin 26 may appear on the surface of the excision mark 36 of the resin escape portion 35. However, since the bubbles become independent bubbles, leakage from the bubble portion or deterioration of heat insulation may occur. There is no.

(Operation effect 2)
With the configuration 2, the following operational effects can be obtained. That is, since the non-foamable resin 24 is composed of a transparent resin or a translucent resin having light transmittance, the state of the heat insulating material layer formed inside the wall thickness of the joint body 27 can be easily confirmed from the outside. be able to. For example, the heat insulating material layer is not sufficiently spread over the entire joint body 27 (for example, a missing portion of the heat insulating material layer is generated at the position of the merging portion 29), or the heat insulating material layer is on the side of the receiving portion 28. It is possible to easily detect problems such as protruding.

  In addition, the insertion state, adhesion, bonding state, and the like of the tube member with respect to the light-transmitting receiving portion 28 can be easily confirmed visually from the outside. In particular, by using a colored adhesive for bonding between the tube member and the receiving portion 28, problems such as insufficient insertion of the tube member, forgetting to apply the adhesive (non-adhesion) and insufficient application (adhesion failure) can be easily achieved. Can be sensed.

  Therefore, both the product quality and the construction quality of the pipe joint 21 with a heat insulating layer can be easily managed from the outside.

(Operation effect 3)
With the configuration 3, the following operational effects can be obtained. That is, by making the width dimension of the excision mark 36 of the resin escape portion 35 with respect to the joint body 27 approximately 1 mm or more and 4 mm or less, the non-foamable resin 24 is effectively released from the joint body 27 to the external resin escape portion 35. In addition, the cut marks 36 can be made less noticeable while preventing the unnecessary non-foamable resin 24 and the foamable resin 26 from escaping from the joint body 27 to the resin escape portion 35.

  Here, when the width dimension of the excision mark 36 is less than 1 mm, it is difficult for the non-foamable resin 24 to escape from the joint body 27 to the resin escape portion 35, and the non-foamable resin 24 is solidified at the merging portion 29. (That is, a missing portion of the heat insulating material layer is generated). On the other hand, when the width dimension of the excision mark 36 is larger than 4 mm, more than necessary non-foamable resin 24 and foamable resin 26 escape from the joint body 27 to the resin escape portion 35 (that is, The amount of injection of the non-foamable resin 24 and the foamable resin 26 increases, and the amount of the non-foamable resin 24 and the foamable resin 26 to be discarded increases, resulting in waste), and the excision marks 36 are easily noticeable ( That is, the appearance quality of the product is deteriorated. Furthermore, the bubble particle size becomes large, which causes problems such as insufficient strength and deterioration of the appearance quality of the product. The numerical values of 1 mm to 4 mm described above are experimental values obtained by repeating trial and error.

  In short, it is only necessary that a heat insulating layer made of the foamable resin 26 is effectively formed around the position of the merging portion 29 of the non-foamable resin 24. Therefore, the escape amount of the foamable resin 26 to the resin escape portion 35 is as follows. Is not a problem.

(Operation effect 4)
According to the configuration 4, the following operational effects can be obtained. That is, the molding die 22 can be simplified by forming the resin escape portion 35 in a state of being offset toward one side with respect to the joining portion 29. That is, the molding die 22 is divided along the joining portion 29, and the space portion 23b for molding the resin escape portion 35 only on the divided molding die 22 (die piece 22a in FIG. 3). It becomes possible to employ a structure in which Thereby, it becomes possible to shape | mold the pipe joint 21 with the heat insulation layer which has the resin escape part 35 easily, reducing metal mold | die cost.

(Operation effect 5)
With the above configuration 5, the following operational effects can be obtained. That is, the branch pipe part 42 in which the branch pipe part 42 and the main pipe part 41 intersect the obtuse angle 43 at the position opposite to the injection part 25 with respect to the Y cheese-shaped joint body 27. By providing it on the side portion, it is possible to easily secure the space 23 b for molding the resin escape portion 35 described above inside the molding die 22. Then, by allowing the foamable resin 26 to escape to the resin escape portion 35 so that the foamable resin 26 is exposed at the excision marks 36, the foamable resin 26 has no missing portion at the joining portion 29 of the non-foamable resin 24. A heat insulating material layer is formed. If the capacity of the resin escape portion 35 is too small, the amount of the non-foamable resin 24 necessary to eliminate the occurrence of the missing portion of the heat insulating layer cannot be released to the outside, and conversely, the capacity is large. If it is too much, the non-foamable resin 24 and the foamable resin 26 are wasted, so it is preferable to set the capacity to an optimum value. The optimum capacity of the resin escape portion 35 can be obtained by, for example, trial and error.

(Operation effect 6)
According to the configuration 6, the same operational effects as the operational effects 1 to 5 can be obtained.

  Although the embodiments of the present invention have been described in detail with reference to the drawings, the embodiments are only examples of the present invention, and the present invention is not limited to the configurations of the embodiments. Needless to say, design changes and the like within a range not departing from the gist of the invention are included in the present invention. Further, for example, when each embodiment includes a plurality of configurations, it is a matter of course that possible combinations of these configurations are included even if not specifically described. Further, when a plurality of embodiments and modifications are shown, it is needless to say that possible combinations of configurations extending over these are included even if not specifically described. Further, the configuration depicted in the drawings is of course included even if not particularly described. Further, when there is a term of “etc.”, it is used in the sense that the equivalent is included. In addition, when there are terms such as “almost”, “about”, “degree”, etc., they are used in the sense that they include those in the range and accuracy recognized by common sense.

  It can be widely applied to pipes that require heat insulation other than the drain pipe of the air conditioning equipment.

DESCRIPTION OF SYMBOLS 21 Pipe joint 22 Molding die 22a Mold piece 23 Cavity space 23a Space part 23b Space part 24 Non-foamable resin 25 Injection | pouring part 26 Foamable resin 27 Joint main body 28 Receptacle part 28a Receptacle part 28b Receptacle part 28c Receptacle Part 29 Junction part 35 Resin escape part 36 Cutting mark 41 Main pipe part 41a Axis line 42 Branch pipe part 42a Axis line 43 Obtuse angle

Claims (5)

A short tubular joint body, and a short tubular receiving part formed integrally with the opening end of the joint body,
The joint body and the receiving part are mainly composed of non- foamable resin,
A the joint non-foaming insulation layer-fitting the heat insulating material layer is enclosed by the wall thickness inside the expandable resin of the resin constituting the main body,
The joint body has a Y cheese shape having a main pipe part and a branch pipe part obliquely branched from the main pipe part,
On a plane passing through the axis of the main pipe and the axis of the branch pipe ,
A pipe joint with a heat insulating layer, characterized by having a portion where the foamable resin is exposed at a position where the branch pipe part and the main pipe part intersect at an obtuse angle in the branch pipe part. A short tubular joint body, and a short tubular receiving part formed integrally with the opening end of the joint body,
The joint body and the receiving part are mainly composed of non-foamable resin,
A the joint non-foaming insulation layer-fitting the heat insulating material layer is enclosed by the wall thickness inside the expandable resin of the resin constituting the main body,
The joint body has a Y cheese shape having a main pipe part and a branch pipe part obliquely branched from the main pipe part,
On a plane passing through the axis of the main pipe and the axis of the branch pipe,
In the branch pipe part, the branch pipe part has a portion where the foamable resin is exposed at a position where the branch pipe part and the main pipe part intersect at an obtuse angle ,
Furthermore, the non-foamable resin is constituted by a transparent resin or a translucent resin having light permeability, and a pipe joint with a heat insulating layer, characterized in that The pipe joint with a heat insulating layer according to claim 1 or 2, wherein a width dimension of a portion where the foamable resin is exposed to the joint body is set to 1 mm or more and 4 mm or less. The portion where the foamable resin is exposed is provided in a state of being offset to one side with respect to a plane passing through the axis of the main pipe part and the axis of the branch pipe part. Item 4. The pipe joint with a heat insulating layer according to any one of Items 3 above. The same amount of non-foamable resin less than the volume of the cavity space provided in the molding die is injected into the cavity space from the injection part, and the surface of the non-foamable resin hardens to some extent inside the cavity space. By injecting foaming resin from the injection part and further pressurizing, the foaming pressure of the foaming resin spreads the non-foaming resin to every corner of the cavity space and the foaming resin foams to make it non-foaming A short tubular joint body having a heat insulating material layer formed inside the resin wall and having the heat insulating material layer, and a short tubular receiving body having no heat insulating material layer integrally formed at the opening end of the joint main body. In the manufacturing method of the pipe joint with a heat insulation layer which shape | molds the pipe joint with a heat insulation layer of any one of Claim 1 thru | or 4 which has a mouth part,
The branch pipe part and the main pipe part in the branch pipe part intersect at an obtuse angle in the cavity space for forming the Y cheese-shaped joint body having the main pipe part and the branch pipe part obliquely branched from the main pipe part. A space for molding a resin escape portion formed by escaping non-foamable resin from the portion to the outside of the joint body is provided,
Non-foamable resin by letting the non-foamable resin and the foamable resin escape to the junction where the non-foamable resin injected from the injection portion merges or an external resin escape portion located in the vicinity thereof at the time of injection molding Forming a heat insulating material layer made of a foamable resin in a state where there is no missing portion at the joining portion of the resin, forming a resin escape portion integrally with the joint body, cutting the resin escape portion after injection molding, The manufacturing method of the pipe joint with a heat insulation layer characterized by forming the exposed excision mark.