JP2021055760A - Pipe joint, drain piping structure for air conditioning installation and pipe joint manufacturing method - Google Patents

Abstract

To provide a pipe joint that can stably ensure high heat insulation performance, and to provide a drain piping structure for an air conditioning installation and a pipe joint manufacturing method.SOLUTION: An elbow type hollow pipe joint 100 includes: a bent pipe part 110 formed into a cylindrical shape; a first pipe end 120 and a second pipe end 130 connected to the bent pipe part 110; and a hollow layer 110T formed in the bent pipe part 110. The first pipe end 120 and the second pipe end 130 are formed to have thicknesses t120 and t130 that satisfy 0.04×t1≤t120 and t130<0.8×t1, where t1 represents a thickness of the bent pipe part 110.SELECTED DRAWING: Figure 2

Description

The present invention relates to a pipe joint, a drain pipe structure for air conditioning equipment, and a method for manufacturing a pipe joint.

As is well known, the drain generated by an air conditioner installed indoors is, for example, a drain piping structure for air conditioning equipment having a drain-up structure that is once raised to a position higher than the drain port of the air conditioner in the middle of the drain piping. It is common to discharge to the outside using.

When constructing such a drain piping structure for air conditioning equipment, in order to connect the drain port of the air conditioner and the flexible hose, for example, the drain pipe connected to the drain port of the air conditioner and the upstream side of the flexible hose (air conditioning). It will be necessary to connect the machine side) with an elbow joint or a pipe joint such as cheese.
Then, in order to prevent drainage from staying at the connection portion of these pipe joints and the like and causing dew condensation, it is common to cover these pipe joints with a heat insulating material or the like.

Therefore, for example, there is disclosed a drain joint (pipe joint) for air conditioning, which improves heat insulation performance by molding a part of the pipe joint with foamed resin and eliminates the need for coating with a heat insulating material or the like (for example, a patent). See Reference 1.).

Further, a technique for improving the heat insulating performance of a pipe joint by forming a hollow layer in the joint body of the pipe joint is disclosed (see, for example, Patent Document 2).

Japanese Patent No. 3699579 JP-A-2018-141505

However, in the air-conditioning drain joint described in Patent Document 1, since the foam layer is formed by injection molding, the foaming ratio cannot be increased.
Further, when vinyl chloride resin is used as the resin for forming the body portion (joint body), the foaming ratio cannot be increased because the vinyl chloride resin has a high viscosity, and high heat insulating performance cannot be ensured for the body portion.

Further, in order to form the foam layer, if the resin is foamed in the mold and then taken out from the mold with insufficient cooling, the foaming proceeds while deforming the surface layer, so that the foaming pressure becomes low. It is necessary to cool the mold for a long time before removing it from the mold.

Further, since the foam layer is opaque, when the foam layer reaches the socket, even if the surface layer is transparent, the socket portion becomes opaque.

On the other hand, in the pipe joint described in Patent Document 2, many members need to be molded separately in order to form a heat insulating layer, and each of these members needs to be bonded with an adhesive, which increases the manufacturing cost. There is a problem of doing.
In addition, when assembling each member by adhesion or the like, there is a possibility that an adhesion error or the like may occur. If the hollow layer is not sufficiently closed due to an adhesion error or the like, the independence of the hollow layer may be broken and the heat insulating performance may be deteriorated.

The present invention has been made in consideration of such circumstances, and provides a pipe joint, a drain pipe structure for air conditioning equipment, and a pipe joint manufacturing method capable of stably ensuring high heat insulation performance. With the goal.

In order to solve the above problems, the present invention proposes the following means.
The invention according to claim 1 is a pipe joint including a joint body formed in a tubular shape and a socket portion connected to the joint body, wherein a hollow layer formed in the joint body is formed. When the thickness of the joint body is t1, the thickness t2 of the solid pipe wall portion of the receiving portion is
It is characterized in that it is formed in 0.04 × t1 ≦ t2 <0.8 × t1.

According to the pipe joint according to the present invention, since the hollow layer is formed in the joint body, high heat insulation performance can be stably ensured.
Further, when a hollow layer formed in the joint body is provided and the thickness of the joint body is t1, the thickness t2 of the solid pipe wall portion of the receiving portion is 0.04 × t1 ≦ t2 <0. Since it is formed to be .8 × t1, for example, when a resin is injected by injection molding and then gas is injected into this resin to form a hollow layer, the solid pipe wall portion of the receiving portion by the injected gas is formed. It is possible to stably control the influence on the resin to be formed.
Therefore, it is possible to prevent the injected gas from forming an unintended space in the solid pipe wall portion, and to stably form the solid pipe wall portion.
As a result, sufficient strength can be ensured in the receiving portion.
Further, when the pipe joint is made of transparent resin, since there is no foamed resin layer, the portion including the socket is transparently formed, and the inserted state of the member inserted into the socket can be visually confirmed. can do.
Further, when molding the resin, it is not necessary to cool the mold in the mold until the foaming pressure decreases, so that the productivity can be improved as compared with the case where the pipe joint provided with the heat insulating layer is molded by the foamed resin. Can be done.

Here, the pipe joint refers to various pipe joints including a joint body and a socket portion connected to the joint body, and includes, for example, an elbow, cheese, a socket, and the like.

The hollow layer formed in the joint body means a space formed in the pipe wall portion of the joint body by gas formed in at least a part between the outer peripheral wall portion and the inner peripheral wall portion, and refers to the space of the joint body. It may be formed over the entire circumference of the wall portion in the circumferential direction, or may be partially formed in a part of the pipe wall portion of the joint body in the circumferential direction around the pipe axis.

Further, the hollow layer may be formed so as to extend to the outer peripheral side of the receiving portion.
Here, the thickness t1 of the joint body refers to the dimension between the outer surface of the pipe wall portion of the joint body and the inner surface of the hole (the dimension including the hollow layer in the portion where the hollow layer is formed). , When a protruding portion is formed on the pipe wall portion of the joint body, it means the thickness excluding the protruding portion.
When the pipe wall portion of the joint body changes depending on the part, the thickness of the socket portion adjacent to the solid pipe wall portion in which the hollow layer is not formed is referred to as the thickness t1 of the joint body. Shall be.

Further, for example, when a curved portion such as an elbow is formed and the length of the wall portion along the pipe axis direction of the joint body differs between the outside of the curved portion (the side where the outer surface of the side view wall portion is long) and the inside. The hollow layer may be formed only in the portion located outside the pipe wall portion of the curved portion. That is, the inside of the curved portion may be configured such that a hollow layer smaller than the outside of the curved portion is formed, or the hollow layer is not formed inside the curved portion.

Further, the thickness t1 of the joint body may be the thickness of the portion of the elbow located outside in the curved shape of the pipe wall portion of the curved pipe portion (joint body).
Further, for cheese, the thickness of the pipe wall portion of the joint body on the side where the cross receiving port is not formed may be used. Further, regarding the socket, the thickness of the portion adjacent to the solid pipe wall portion in the receiving portion may be set.

Further, the thickness t2 of the solid pipe wall portion of the receiving portion means the dimension between the outer surface and the inner surface of the solid pipe wall portion in which the hollow layer is not formed in the receiving portion.
When the insert member is arranged in the receiving portion, it means the thickness of the solid pipe wall portion excluding the insert member.

The invention according to claim 2 is the pipe joint according to claim 1, wherein the hollow layer is formed so as to extend from the bottom portion of the socket portion to the outer periphery on the opening side. It is a feature.

According to the pipe joint according to the present invention, since the hollow layer is formed so as to extend to the outer periphery of the bottom portion of the receiving portion, high heat insulating performance can be ensured in the receiving portion.
Here, the bottom portion of the receiving portion is a step portion formed on the inner side of the straight hole formed in the receiving portion and reduced in diameter when the straight hole is connected to the hole of the joint body. For example, when the insert member is inserted, the position where the insert member is seated, and when a member such as a pipe is inserted without the insert member being arranged, the position where the member is seated.

The invention according to claim 3 is the pipe joint according to claim 1 or 2, wherein an insert member is arranged on the inner peripheral side of the receiving portion.

According to the pipe joint according to the present invention, since the insert member is arranged on the inner peripheral side of the receiving portion, even if the thickness of the faithful pipe wall portion constituting the receiving portion becomes thin, the receiving portion The strength of the can be increased.

Here, the insert member arranged on the inner peripheral side of the receiving portion may be arranged before forming the receiving portion (for example, injection molding), or may be inserted and joined (for example) after forming the pipe joint. For example, it may be adhered).

The invention according to claim 4 is the pipe joint according to any one of claims 1 to 3, wherein ribs protruding outward are formed on the outer surface of the outer peripheral wall portion of the hollow layer. It is characterized by being done.

According to the pipe joint according to the present invention, since ribs protruding outward are formed on the outer surface of the outer peripheral wall portion of the hollow layer, the outer peripheral wall portion of the portion where the hollow layer of the joint body is formed is formed. Strength can be improved.
Further, for example, when gas is injected into the resin injected into the cavity by injection molding to form a hollow layer in the joint body, the gas is injected through the ribs to form the gas. Since the injection hole is not formed on the outer peripheral wall portion of the joint body, the independence of the hollow layer from the outside can be stably ensured.
Further, the gas injection hole can be sealed easily and efficiently as compared with the case where the gas injection hole is formed in the joint body.

The invention according to claim 5 is the pipe joint according to claim 4, wherein the thickness of the rib is smaller than the thickness of the outer peripheral wall portion.

According to the pipe joint according to the present invention, the rib thickness is formed to be smaller than the thickness of the outer peripheral wall portion, so that the rib solidifies faster than the outer peripheral wall portion.
As a result, for example, when a pipe joint is molded by injection molding, a resin is injected by injection molding, and then gas is injected from a rib to form a hollow layer, the hollow layer is sealed stably and in a short time. Can be stopped.

The invention according to claim 6 is a drain pipe structure for an air conditioner, and is characterized by including the pipe joint according to any one of claims 1 to 5.

According to the drain piping structure for air conditioning equipment according to the present invention, since the pipe joint having high heat insulation performance is provided, it is possible to efficiently and stably prevent dew condensation of the drain discharged from the air conditioning equipment. ..

The invention according to claim 7 is a pipe joint manufacturing method for manufacturing a pipe joint according to any one of claims 1 to 5, wherein a molding mold having a cavity corresponding to the pipe joint is formed. On the other hand, a first step of injecting a resin for forming the pipe joint and a second step of injecting gas into the resin injected in the first step to form a hollow layer in the joint body. , It is characterized in that.

According to the pipe joint manufacturing method according to the present invention, a resin for forming a pipe joint is injected into a molding mold in which a cavity corresponding to the pipe joint is formed in the first step, and in the second step, the resin is injected. Since gas is injected into the resin injected in the first step to form a hollow layer in the joint body, a hollow layer for ensuring high heat insulation performance should be efficiently formed in the joint body of the pipe joint. Can be done.
As a result, it is not necessary to separately form the plurality of members, and it is not necessary to assemble the plurality of members by adhesion or the like, so that the manufacturing cost when manufacturing the pipe joint can be reduced.
Further, since a gap is not formed between the members due to an adhesion error or the like in the pipe joint, high heat insulation performance of the pipe joint can be ensured.

Here, with respect to the gas injection hole formed when the gas is injected in the second step, it is preferable to inject resin to seal the gas injection hole in the subsequent step, but the gas injection hole The sealing may be set arbitrarily. For example, after completing the second step, the molded product may be taken out from the molding die, and then filled with a sealing resin to seal the gas injection hole.

Further, the resin injection in the first step may be injected directly into the cavity from the outer peripheral surface side of the joint body, may be injected into the cavity via the runner, or may be injected into the cavity via the nozzle. You may.
Further, in the first step, for example, the cavity of the molding die may be directly injected into the portion corresponding to the outer peripheral wall portion of the joint body, or may be injected outward from the outer surface of the outer peripheral wall portion of the joint body. It may be injected into a protruding portion (for example, a runner to be removed from a rib or a molded product) and injected through the protrusion.

Further, in the second step, the gas injection site is preferable in that the resin and the gas injection path can be shared by injecting the resin from the resin injection site in the first step. Gas may be injected from a part other than the part where the resin is injected.

The invention according to claim 8 is the pipe joint manufacturing method according to claim 7, wherein the molding die is outward from the outer surface of the outer peripheral wall portion of the joint body in the pipe joint after molding. A protruding portion is formed so as to project toward the inside of the resin injected in the first step from a portion corresponding to the protruding portion in the second step with respect to the molding die in which the protruding portion is formed. Gas is injected into the hollow layer to form the hollow layer, and after the second step, resin is injected from a portion corresponding to the protruding portion to seal the gas injection hole formed when the gas is injected. A third step is provided.

According to the pipe joint manufacturing method according to the present invention, the second molding mold has a protruding portion that protrudes outward from the outer surface of the outer peripheral wall portion of the joint body in the molded pipe joint. In the step, gas is injected into the resin injected in the first step from the part corresponding to the protruding part to form a hollow layer, and after the second step, in the third step, the resin is injected from the part corresponding to the protruding part. By sealing the gas injection hole formed when the gas is injected in the second step by injection, the gas injection hole can be efficiently sealed, so that the manufacturing cost of the pipe joint can be further reduced. can do.
Further, in the second step, gas is injected into the resin from the portion corresponding to the protruding portion, and in the third step, the resin is injected from the portion corresponding to the protruding portion to seal the gas injection hole. It is possible to prevent the resin at the time of stopping from blowing through into the hollow layer formed in the joint body, and to stably seal the gas injection hole.
As a result, a pipe joint having high heat insulation performance can be efficiently and stably manufactured.

The invention according to claim 9 is the pipe joint manufacturing method according to claim 7, wherein the molding die is the gas from the outer surface of the solid pipe wall portion of the socket portion of the pipe joint. Is formed, and in the second step, gas is injected into the resin injected in the first step from the injection path to form the hollow layer, and after the second step, It is characterized by comprising a third step of injecting a resin from the injection path and sealing a gas injection hole formed when the gas is injected.

According to the pipe joint manufacturing method according to the present invention, in the molding mold, an injection path is formed in a solid pipe wall portion (thickness t2) of a socket portion thinner than the thickness t1 of the joint body, and the first. In the second step, gas is injected into the resin injected in the first step from this injection path to form a hollow layer, and in the third step, the resin is injected from the injection path and formed when the gas is injected. Since the gas injection hole is sealed, the gas injection hole can be efficiently sealed, and the manufacturing cost of the pipe joint can be further reduced.
Further, since the gas injection path is formed in the receiving portion, it is not necessary to form a gas injection hole in the outer peripheral wall portion of the joint body, and a seam is formed in the outer peripheral wall portion of the joint body in which the hollow layer is formed. It is possible to stably form a hollow layer that is independent of the outside without forming holes or holes.
Further, in the third step, the resin is injected through the solid tube wall portion of the receiving portion to seal the gas injection hole, so that the resin at the time of sealing seals the solid tube wall portion. The resin is solidified at a relatively early timing, and it is suppressed that the resin blows through the hollow layer formed in the joint body, so that the gas injection hole can be stably sealed.
As a result, a pipe joint having high heat insulation performance can be efficiently and stably manufactured.

The invention according to claim 10 is the pipe joint manufacturing method according to any one of claims 7 to 9, after the insert member is arranged at a portion corresponding to the receiving portion of the molding die. , The first step is performed.

According to the pipe joint manufacturing method according to the present invention, since the first step is performed after the insert member is placed at the portion corresponding to the socket portion of the molding die, the socket is not fitted or inserted. It is possible to efficiently manufacture a pipe joint in which an insert member is arranged in a portion.

According to the pipe joint, the drain pipe structure for air conditioning equipment, and the pipe joint manufacturing method according to the present invention, high heat insulation performance can be stably ensured.

It is a schematic block diagram explaining an example of the drain pipe structure for the air-conditioning equipment to which the elbow type hollow joint which concerns on 1st Embodiment of this invention is applied. It is a vertical cross-sectional view including a pipe shaft explaining an example of the schematic structure of the elbow type hollow joint which concerns on 1st Embodiment. It is a figure explaining the schematic structure of the molded product at the time of manufacturing the elbow type hollow joint which concerns on 1st Embodiment, (A) is a vertical sectional view including a pipe shaft, and (B) is an arrow view in (A). A cross-sectional view orthogonal to the tube axis shown by IIIB-IIIB is shown. It is a conceptual diagram explaining an example of the schematic structure of the molding die for manufacturing the elbow type hollow joint which concerns on 1st Embodiment. It is a conceptual diagram explaining the outline of the manufacturing method of the elbow type hollow joint which concerns on 1st Embodiment, (A) is a resin injection process (first process) which ejects resin into a cavity, (B) is inside a cavity. A gas injection step (second step) of injecting gas into the resin injected into the hollow layer to form a hollow layer, and (C) is a sealing resin injection step of sealing the holes formed when the hollow layer is formed. (Third step) is shown. It is a conceptual diagram explaining the outline of the manufacturing method which concerns on the modification of the elbow type hollow joint which concerns on 1st Embodiment. It is a vertical cross-sectional view including a pipe shaft explaining an example of the schematic structure of the elbow type hollow joint which concerns on 2nd Embodiment of this invention.

<First Embodiment>
Hereinafter, the first embodiment of the present invention will be described with reference to FIGS. 1 to 5.
FIG. 1 is a schematic configuration diagram illustrating an example of a drain pipe structure for air conditioning equipment to which an elbow type hollow joint (pipe joint) according to the first embodiment of the present invention is applied. Further, FIG. 2 is a vertical cross-sectional view illustrating an example of a schematic configuration of the elbow type hollow joint according to the first embodiment.

In the figure, reference numeral 1 is a drain pipe structure for air conditioning equipment, reference numeral 100 is an elbow type hollow joint (pipe joint), reference numeral 110 is a curved pipe portion (joint body), and reference numeral 120 is a first pipe end portion (receptacle). Reference numeral 130 indicates a second pipe end portion (receptacle portion), reference numeral 110T indicates a hollow layer, and reference numerals 125 and 135 indicate insert members. Further, reference numeral O1 is a first pipe shaft (tube shaft), reference numeral O2 is a second pipe shaft (tube shaft), and reference numeral O is a pipe shaft including the first pipe shaft O1 pipe shaft and the second pipe shaft O2. Reference numeral S1 indicates the inside of the curved portion of the curved pipe portion (joint body), and reference numeral S2 indicates the outside of the curved portion of the curved pipe portion (joint body).

As shown in FIG. 1, the drain piping structure 1 for air conditioning equipment includes, for example, a drain pipe 31 provided in an air conditioner 3 provided on the ceiling and a drain hose 4 for discharging drain generated from the drain pipe 31 to the outside. , A flexible hose 5, a drain pipe 6, a connecting joint 7 connecting the drain hose 4 and the flexible hose 5, an elbow type hollow joint (pipe joint) 100 forming a drain-up portion, a drain hose 4 and an elbow type hollow. It includes a joint (pipe joint) 100 and a connection joint 7 for connecting to the joint (pipe joint) 100.

Here, the flexible hose 5 can be configured by, for example, a covered hose having a two-layer structure in which the outer circumference of a soft or relatively hard vinyl chloride hose is coated with a heat insulating material such as urethane foam.

In the first embodiment, for example, a drain hose 4 made of a cross-linked polyethylene pipe is provided between the drain pipe 31 and the connecting joint 7, and an elbow type hollow joint (pipe joint) 100 is provided between the connecting joint 7 and the flexible hose 5. Is provided.
That is, as the connection structure of the present embodiment, the drain pipe 31, the drain hose 4, the connection joint 7, the elbow type hollow joint 100, and the flexible hose 5 are connected in this order from the air conditioner 3 side, and the tip of the flexible hose 5 is connected. The drain pipe 6 is connected, and the drain is discharged through these pipe materials. Further, the flexible hose 5 is arranged so as to rise upward from the elbow type hollow joint 100.

As shown in FIG. 1, the air conditioner 3 and the drain pipe connection structure 1 for air conditioning equipment are suspended from the building ceiling surface T by a suspending material 8.
Further, the drain hose 4, the connecting joint 7, and the elbow type hollow joint 100 are covered with a heat insulating material (not shown) or have a heat insulating function to prevent the drain discharged from the air conditioner from condensing. It is preferable to do so.
The air conditioner 3 and the drain pipe 6 may be joined without passing through the flexible hose 5. In that case, the drain pipe 6 and the elbow type hollow joint (pipe joint) 100 are combined to construct a drain-up structure. May be good.

Hereinafter, the elbow type hollow joint (pipe joint) 100 will be described with reference to FIG.
As shown in FIG. 2, the elbow type hollow joint (pipe joint) 100 includes a curved pipe portion (joint body) 110, a first pipe end portion (receptacle portion) 120, and a second pipe end portion (receptacle portion). ) 130, a hollow layer 110T, and insert members 125 and 135, and the curved pipe portion 110, the first pipe end portion 120, and the second pipe end portion 130 are formed along the pipe shaft O.
Further, in the elbow type hollow joint (pipe joint) 100, a through hole 100H through which drain passes is formed inward along the pipe shaft O.

The material for forming the elbow type hollow joint 100 can be arbitrarily set. For example, polypropylene resin (PP), polyethylene resin (PE), acrylonitrile-butadiene-styrene resin (ABS), polyvinyl chloride resin (polyvinyl chloride resin) ( It is preferable to use PVC).
Further, it is more preferable that a part or all of the elbow type hollow joint 100 (particularly, the first pipe end portion 120 and the second pipe end portion 130) is transparent.
Further, it is preferable to use chemical resistant ABS in terms of having chemical resistance.

As shown in FIG. 2, for the curved pipe portion (joint body) 110, for example, the first pipe end portion (receptacle portion) 120 is connected to one end side in the pipe axis O direction, and the second pipe end is connected to the other end side. A unit (receptacle unit) 130 is connected.
Further, as shown in FIG. 2, a hollow portion 210T formed between the inner peripheral wall portion 111 and the outer peripheral wall portion 112 is arranged in the curved pipe portion 110.

Further, as shown in FIG. 2, the curved pipe portion 110 has a first pipe end portion (receptacle portion) 120 and a second pipe end portion (receiver) in a cross section including the pipe shaft O (hereinafter referred to as a side view). The mouth portion) 130 is configured to intersect with each other at an intersection angle of 91.1 ° and to project from the inner side S1 to the outer side S2 of the curved shape (curved portion) constituting the curved pipe portion 110.

Further, as shown in FIG. 2, the inner diameter dimension of the curved pipe portion 110 is formed so that the radius from the pipe shaft O is R111.
Further, as for the outer diameter dimension of the curved pipe portion 110, a radius from the pipe shaft O is formed at R112.
The thickness t1 of the curved pipe portion 110 (including the hollow portion 110T) can be defined by (outer diameter dimension R112) − (inner diameter dimension R111).
In this embodiment, the thickness t1 of the curved tube portion 110 is formed to be, for example, 25 mm.
In order to form the hollow layer 110T in the curved tube portion 110 by injection molding, the thickness t1 of the curved tube portion 110 is preferably set to, for example, 6 mm to 30 mm.

The first pipe end portion (receptacle portion) 120 includes a two-stage tubular pipe wall portion connected to one end side of the curved pipe portion 110.
Further, in the first pipe end portion (receptacle portion) 120, for example, an insert member 125 is arranged on the inner peripheral side of the pipe wall portion.
Whether or not to arrange the insert member 125 can be arbitrarily set, but when the elbow type hollow joint 100 is made of a material that cannot be joined by an adhesive, it is made of a material that can be joined by an adhesive. It is preferable to arrange the configured insert member 125.

In this embodiment, the outer diameter dimension of the first pipe end portion (receptacle portion) 120 is formed to be the same as the external dimension R112 of the curved pipe portion 110 from the bottom portion 120B of the socket to the opening 120A side. There is.
Then, the opening 120A side of the first pipe end portion (receptacle portion) 120 with respect to the portion formed to have the same diameter as the outer diameter dimension R112 of the curved pipe portion 110 is the first pipe end portion (receptacle portion) 120. The outer diameter dimension of is formed to be smaller than the outer diameter dimension R112 of the pipe shaft O (the radius from O1 is formed in R122, that is, the curved pipe portion 110 is formed.
Further, in the first pipe end portion (receptacle portion) 120, the pipe wall portion is solidly formed in the portion formed in the outer diameter dimension R122.

Further, as shown in FIG. 2, the inner diameter dimension of the portion where the pipe wall portion is solidly formed in the first pipe end portion (receptacle portion) 120 is formed so that the radius from the pipe shaft O is R121. The radius R121 becomes smaller from the opening 120A toward the curved pipe portion 110. Further, the radius R121 is the outer diameter of the member (the end of the drain pipe 6 and the flexible hose 5) inserted into the first pipe end (receptacle) 120, and is medium in the first pipe end (receptacle) 120. As for the outer diameter dimension of the actually formed portion, the radius from the pipe axis O is formed at R122.

The thickness t120 (t2) of the solidly formed portion of the first pipe end portion (receptacle portion) 120 can be defined by the outer diameter dimension R122-inner diameter dimension R121.

Further, in this embodiment, the thickness t120 of the solidly formed portion of the first pipe end portion (receptacle portion) 120 is set to, for example, 1.0 mm or more.
The thickness t120 of the solidly formed portion is preferably set to, for example, 1.0 mm to 10 mm in order to stably form the solid pipe wall portion and to secure the strength of the receiving portion. Is.

Further, the thickness t120 (t2) of the solidly formed portion at the first pipe end portion (receptacle portion) 120 is when the thickness of the wall portion of the curved pipe portion 110 is t1.
0.04 x t1 ≤ t120 (t2) <0.8 x t1
Is formed in.
By setting the thickness of the first pipe end (receptacle) 120 to this range, the position of the gate for introducing the resin into the mold when the elbow type hollow joint (pipe joint) 100 is molded by injection molding. Is the outer surface of the first pipe end portion (receptacle portion) 120, and the first pipe end portion (receptacle portion) 120 can be formed solidly.
When the thickness t2 of the first pipe end (receptacle) 120 exceeds 0.8 × t1, gas unintentionally invades when forming a hollow layer in the first pipe end (receptacle) 120. Or, a hollow portion is formed at an unintended part of the first pipe end portion (receptacle portion) 120 remaining at the first pipe end portion (receptacle portion) 120 around the gate, and the first pipe end portion (receiver) is formed. Mouth) The strength of 120 may decrease.
When the thickness t2 of the first pipe end portion (receptacle portion) 120 is less than 0.04 × t1, the curved pipe portion 110 or the first pipe portion 110 or the first pipe portion 110 or the first It is difficult for the resin to flow to the end of the 2 pipes (130), and there is a risk that a part of the curved pipe 110 or the end of the second pipe (130) will not be formed.
In this case, a gate mark, which is a mark of cutting the runner attached to the gate, is formed on the outer surface of the first pipe end portion (receptacle portion) 120.
The thickness t120 (t2) of the solidly formed portion is, for example,
0.08 x t1 ≤ t120 (t2) <0.5 x t1
It is more preferable to set to
0.1 × t1 ≦ t120 (t2) <0.4 × t1
It is more preferable to set to.

The insert member 125 is, for example, when the elbow type hollow joint (pipe joint) 100 is molded by injection molding, by arranging it in a molding die in advance and then injection molding, the first pipe end portion (receptacle portion) is formed. It is mounted on the inner peripheral side of 120.
Then, in the first pipe end portion (receptacle portion) 120, the insertion port of the member (for example, the flexible hose 5 or the connecting member 7) constituting the drain piping structure for the air conditioner is the insert member 125 along the pipe shaft O1. It can be inserted on the inner circumference side.

Further, the material for forming the insert member 125 can be arbitrarily set, and for example, adhesion (bonding) such as vinyl chloride (PVC) or ABS resin (for example, it is more preferable to be transparent). ) It is preferable that it is a possible resin (amorphous resin).
When the first pipe end portion (receptacle portion) 100 is provided with a sealing material such as an O-ring or rubber packing, the insert member may not be provided, and when the insert member is provided with the sealing material. Does not have to be made of a resin capable of adhering (bonding) the insert member.

The second pipe end portion (receptacle portion) 130 includes a two-stage tubular pipe wall portion connected to the other end side of the curved pipe portion 110.
Further, in the second pipe end portion (receptacle portion) 130, for example, the insert member 135 is arranged on the inner peripheral side of the pipe wall portion.
Whether or not to arrange the insert member 135 can be arbitrarily set, but when the elbow type hollow joint 100 is made of a material that cannot be joined by an adhesive, the insert member 135 can be arranged. Suitable.

In this embodiment, the outer diameter dimension of the second pipe end portion (receptacle portion) 130 is formed to be the same as the external dimension R112 of the curved pipe portion 110 from the bottom portion 130B of the socket to the opening 130A side. There is.
The second pipe end (receptacle) 130 is located on the opening 130A side of the second pipe end (receptacle) 130 with the same diameter as the outer diameter R112 of the curved pipe 110. The outer diameter dimension of is formed to be smaller than the outer diameter dimension R112 of the pipe shaft O (the radius from O2 is formed in R132, that is, the curved pipe portion 110 is formed.
Further, in the second pipe end portion (receptacle portion) 130, the pipe wall portion is solidly formed in the portion formed in the outer diameter dimension R132.

Further, as shown in FIG. 2, the inner diameter dimension of the portion where the pipe wall portion is solidly formed in the second pipe end portion (receptacle portion) 130 is formed in R131 with a radius from the pipe shaft O.
Further, the outer diameter dimension of the solidly formed portion of the second pipe end portion (receptacle portion) 130 is such that the radius from the pipe shaft O is formed at R132.
The thickness t130 (t2) of the solidly formed portion of the second pipe end portion (receptacle portion) 130 can be defined by the outer diameter dimension R122-inner diameter dimension R121.

Further, in this embodiment, the thickness t130 of the solidly formed portion of the second pipe end portion (receptacle portion) 130 is set to, for example, 1.0 mm or more.
The thickness t130 of the solidly formed portion is preferably set to, for example, 1.0 mm to 10 mm in order to stably form the solid pipe wall portion and to secure the strength of the receiving portion. Is.

Further, the thickness t120 (t2) of the solidly formed portion at the second pipe end portion (receptacle portion) 130 is when the thickness of the wall portion of the curved pipe portion 110 is t1.
It is formed so that 0.04 × t1 ≦ t130 (t2) <0.8 × t1.
The thickness t130 (t2) of the solidly formed portion is, for example,
0.08 x t1 ≤ t130 (t2) <0.5 x t1
It is more preferable to set to
0.1 × t1 ≦ t130 (t2) <0.4 × t1
It is more preferable to set to.

Like the insert member 125, the insert member 135 is, for example, the second pipe end by arranging the elbow type hollow joint (pipe joint) 100 in the molding die in advance and then injection molding when molding the elbow type hollow joint (pipe joint) 100 by injection molding. It is mounted on the inner peripheral side of the portion (receptacle portion) 130.
Then, in the second pipe end portion (receptacle portion) 130, the insertion port P2 of the member (for example, the flexible hose 5 or the connecting member 7) constituting the drain piping structure for the air conditioner is the insert member 135 along the pipe shaft O2. It is possible to insert it on the inner circumference side of.

As shown in FIG. 2, the hollow layer 110T is formed, for example, over the entire circumference of the curved pipe portion (joint body) 110 in this embodiment.
Further, the hollow layer 110T is formed of a tubular inner peripheral wall portion 111 formed on the through hole 100H side in the curved pipe portion 110 and an outer peripheral wall portion 112 formed on the outer surface side of the curved pipe portion (joint body) 110. It is placed in between.

Further, in the first embodiment, the hollow layer 110T extends from the bottom 120B of the socket of the first pipe end (receptacle) 120 to the opening 120A side, for example, in the pipe axis O direction. , The first tube end hollow portion 120T is formed at the first tube end portion (receptacle portion) 120.
As a result, the hollow layer 110T insulates a part of the opening 120A side of the bottom 120B of the receiving port of the first pipe end (receiving part) 120 from the outer peripheral side of the pipe wall portion over the entire circumference in the circumferential direction. It is configured.

Further, for example, the hollow layer 110T extends from the bottom 130B of the socket of the second pipe end (receptacle portion) 130 to the opening 130A side in the pipe axis O direction, and extends to the opening 130A side, and the second pipe end portion. The second pipe end hollow portion 130T is formed in the (receptacle portion) 130.
As a result, the hollow layer 110T insulates a part of the opening 130A side of the bottom 130B of the receiving port of the second pipe end (receiving part) 130 from the outer peripheral side of the pipe wall portion over the entire circumference in the circumferential direction. It is configured.

Next, a method of manufacturing an elbow type hollow joint (pipe joint) will be described with reference to FIGS. 3 to 5.
In this embodiment, the elbow type hollow joint 100 is manufactured by, for example, injection molding.

First, with reference to FIG. 3, a schematic configuration of a molded product when manufacturing an elbow type hollow joint will be described.
FIG. 3 is a diagram for explaining a schematic configuration of a molded product when manufacturing an elbow type hollow joint according to the first embodiment, and FIG. 3 (A) is a vertical sectional view including a pipe shaft in FIG. 3 (B). ) Shows a cross-sectional view orthogonal to the tube axis shown by arrow IIIB-IIIB in FIG. 3 (A).
In FIG. 3, reference numeral 100A is a molded product for manufacturing an elbow type hollow joint, and reference numeral 114 is a molding rib (protruding portion).

As shown in FIGS. 3 (A) and 3 (B), the molded product 100A when manufacturing the elbow type hollow joint 100 is, for example, the curvature of the curved pipe portion 100 of the elbow type hollow joint 100 described with reference to FIG. A forming rib (protruding portion) 114 is formed on the outer side S2 of the portion along the pipe axis O direction.
Further, as shown in FIG. 3B, the molded product 100A has, for example, the pipe shaft of the curved pipe portion 110 between the inner peripheral wall portion 111 and the outer peripheral wall portion 112 when viewed along the pipe shaft O. A hollow layer 110T is formed over the entire circumference around O.

The form of the molding rib (protruding portion) 114 can be arbitrarily set, and the molding rib (protruding portion) 114 is not limited to the pipe axis O direction and is orthogonal to the pipe axis O. It may be formed in the direction. Further, instead of the molding rib (protruding portion) 114, a point-shaped protruding portion may be formed. Further, the forming rib (protruding portion) 114 and the point-shaped protruding portion may be formed by one or a plurality.

Further, the thickness (t114) of the molding rib (protruding portion) 114 can be appropriately set. For example, when it is used to blow gas when forming the hollow layer 110T, gas injection is performed. It may be set according to the position and number of entrances.
Further, using the molding rib (protruding portion) 114 along the pipe shaft O as a gate for introducing the resin into the mold is evenly applied to the two pipe end portions (receptacle portions) 120 and 130. It is preferable in that it can be filled with resin.

Further, the thickness (t114) of the molding rib (protruding portion) 114 solidifies faster than the outer peripheral wall portion 112 so that the resin at the time of sealing does not blow into the hollow layer 110T. It is preferably formed thinner than the wall thickness of 112 (t112).
When the forming rib (protruding portion) 114 is left as a part of the elbow type hollow joint 100, it may be advantageous to form the curved pipe portion 110 thick in order to secure the strength.

Next, with reference to FIG. 4, a schematic configuration of a molding die for manufacturing an elbow type hollow joint will be described.
FIG. 4 is a conceptual diagram illustrating an example of a schematic configuration of a molding die for manufacturing an elbow type hollow joint.
In FIG. 4, reference numeral C100 is an injection molding die (molding die), reference numerals C101 and C102 are main molds (outer molds), reference numeral C103 is an insert core (core), and reference numeral C110 is a cavity. C114 indicates a runner corresponding to the forming rib (protruding portion) 1.

As shown in FIG. 4, the injection molding die (molding die) C100 includes main molds (outer molds) C101 and C102 and an insert core (core) C103.
Then, in a state where the main molds (outer molds) C101 and C102 and the insert core (core) C103 are molded, the cavity C100 for forming the elbow type hollow joint 100 inside and the runner (protruding) to be removed after molding are formed. Part) C114 is formed.

Further, the nozzle hole C101N is connected to the runner (protruding portion) C114, and the nozzle hole C101N and the runner (protruding portion) are formed from an injection nozzle (not shown) mounted on the injection molding die (molding die) C100. ) A resin or gas is injected into the cavity C100 along the arrow J direction via the nozzle hole C101N via C114. At this time, it is preferable that the opening of the cavity C110 of the nozzle hole C101N does not face the cavity C110 for forming the outer peripheral wall portion 112.
In this embodiment, the nozzle hole C101N is configured to inject or inject resin or gas along the thickness direction of the runner (protruding portion) C114.

Next, with reference to FIG. 5, a method (manufacturing method) for forming the molded product 100A when manufacturing the elbow type hollow joint 100 will be described.
5A and 5B are conceptual diagrams illustrating an outline of a method for manufacturing an elbow type hollow joint. FIG. 5A shows a resin injection step (first step) of injecting resin into a cavity, and FIG. 5B shows a resin injection step. A gas injection step (second step) of injecting gas into the resin injected into the cavity to form a hollow layer is performed, and FIG. 5 (C) shows a seal for sealing the holes formed when the hollow layer is formed. The stop resin injection step (third step) is shown.

In injection molding, for example, in the resin injection step (first step), the heat-melted resin is injected into the injection molding mold, and then in the gas injection step (second step), into the resin injected into the cavity. A gas (for example, an inert gas) is injected to seal the gas injection hole formed when the hollow layer is formed in the sealing resin injection step (third step), and the injection molding mold is cooled and then cooled. Take out the molded product from.
Further, in this embodiment, before the resin injection step (first step), the insert member is arranged at the corresponding portions of the first pipe end portion and the second pipe end portion (not shown), and then the injection molding die is formed. Mold.

(1) Resin injection process (first process)
First, as shown in FIG. 5A, an injection nozzle (not shown) is attached to the runner molding portion C114 of the injection molding die 100 in the direction indicated by the arrow J1 (thickness direction of the runner molding portion C114).
Then, the first resin J1 forming the elbow type hollow joint 100 is injected into the cavity C110 via the runner molding portion C114.
As shown in FIG. 5A, the first resin J1 injected into the cavity C110 is filled, for example, halfway through the cavity C110. The filling amount of the first resin J1 can be appropriately set.

(2) Gas injection process (second process)
Next, as shown in FIG. 5B, a gas injection nozzle (not shown) is attached to the runner molding portion C114 of the injection molding die 100 in the direction indicated by the arrow G (thickness direction of the runner molding portion C114). ..
Then, the gas G forming the hollow layer 110T is injected into the first resin J1 injected into the cavity C110 via the runner molding portion C114.

As shown in FIG. 5B, the gas G injected through the runner forming portion C114 proceeds into, for example, the first resin J1 filled in the cavity C110. The injection amount of Gus G can be appropriately set.
The gas G to be injected when forming the hollow layer 110T can be appropriately set, but for example, it is preferable to use an inert gas such as air, nitrogen gas or carbon dioxide gas.

(3) Sealing resin injection process (third process)
Next, as shown in FIG. 5C, an injection nozzle (not shown) is attached to the runner molding portion C114 of the injection molding die 100 in the direction indicated by the arrow J2 (thickness direction of the runner molding portion C114).
Then, the second resin J2 for sealing the gas injection hole GH (see FIG. 5B) is injected into the runner molding portion C114 via the runner molding portion C114.
The gas injection hole GH formed in the runner molding portion C114 is sealed with the second resin J2 as shown in FIG. 5 (C). The injection pressure and injection amount of the second resin J2 are set so as not to be wiped into the hollow layer 110T after injection. At this time, since the opening of the cavity C110 of the nozzle hole C101N does not face the cavity C110 for forming the outer peripheral wall portion 112, the injected second resin J2 is placed on the wall surface of the main mold C102 of the runner molding portion. The collision prevents the second resin J2 from protruding into the hollow layer 110T.

Then, after the molded product is cooled to a predetermined temperature, the molded product 100A is taken out from the injection molding die C100.
Further, in this embodiment, the molding rib 114 is cut and removed from the molded product 100A.

According to the elbow type hollow pipe joint 100 according to the first embodiment, since the hollow layer 110T is formed in the curved pipe portion (joint body) 110, high heat insulation performance can be stably ensured.
Further, when the hollow layer 110T formed in the curved pipe portion (joint body) 110 is provided and the thickness of the curved pipe portion (joint body) 110 is t1, the first pipe end portion 120 and the second pipe end portion 120 At 130, the thickness of the solid tube wall portion t120, t130 (t2),
Since it is formed in 0.04 × t1 ≦ t120, t130 (t2) <0.8 × t1, a solid pipe wall portion is formed at the first pipe end portion 120 and the second pipe end portion 130. , Sufficient strength can be secured for the first pipe end 120 and the second pipe end 130.

Further, according to the elbow type hollow pipe joint 100, since there is no foamed resin layer, by using a transparent dendritic material, the first pipe end portion 120 and the second pipe end portion 130 of the elbow type hollow pipe joint 100 are used. It is possible to visually confirm the inserted state of the member inserted into the first pipe end portion 120 and the second pipe end portion 130 by forming the portion including the above transparently.
Further, when molding the resin, it is not necessary to cool the mold in the mold until the foaming pressure drops. Therefore, as compared with the case where the elbow type hollow pipe joint 100 provided with the heat insulating layer 110T is molded by the foamed resin, Productivity can be improved.
Since the foamed resin layer has the effect of suppressing shrinkage (sink) of the resin after molding, the foamed resin layer is not impaired in transparency and productivity (for example, the foaming ratio is less than 1.1 times). The elbow type hollow joint 100 may include a foamed resin layer.

Further, according to the elbow type hollow pipe joint 100 according to the first embodiment, the hollow layer 110T has the first pipe end portion 120, the second pipe end portion 130 has the first pipe end hollow portion 120T, and the second pipe end hollow. Since the portion 130T is formed, high heat insulation performance can be ensured at the first pipe end portion 120 and the second pipe end portion 130.

Further, according to the elbow type hollow pipe joint 100, since the insert members 125 and 135 are arranged on the inner peripheral side of the first pipe end 120 and the second pipe end 130, the first pipe end 120, Even if the thicknesses t120 and t130 of the faithful pipe wall portion constituting the second pipe end 130 are reduced, the strength of the first pipe end 120 and the second pipe end 130 can be ensured.

Further, according to the elbow type hollow pipe joint 100, when the forming rib 114 is left on the outer peripheral wall portion 112 of the curved pipe portion 110, the strength of the curved pipe portion (joint body) 110 can be improved. it can.
Further, according to the elbow type hollow pipe joint 100, the thickness t114 of the forming rib 114 is formed thinner than the thickness t112 of the outer peripheral wall portion 112, so that the hollow layer 110T can be stably and quickly formed. Can be sealed.

Further, according to the pipe joint manufacturing method according to the first embodiment, the hollow layer 110T for ensuring high heat insulation performance is efficiently formed in the curved pipe portion (joint main body) 110 of the elbow type hollow pipe joint 100. be able to.
As a result, it is not necessary to separately form the plurality of members, and it is not necessary to assemble the plurality of members by adhesion or the like, so that the manufacturing cost when manufacturing the elbow type hollow pipe joint 100 can be reduced.
Further, since the elbow type hollow pipe joint 100 does not have a gap formed between the members due to an adhesion error or the like, the high heat insulating performance of the elbow type hollow pipe joint 100 can be ensured.

Further, according to the elbow type hollow pipe joint 100, the hollow portion 110T is formed by the injection molding die C100 by injecting gas G into the first resin J1 filled by injection molding. It is possible to form a seamless outer wall portion of the empty pipe joint 100, and it is possible to ensure high cutting performance.

Further, according to the pipe joint manufacturing method according to the first embodiment, the gas injection hole can be efficiently sealed by sealing the gas injection hole in the sealing resin injection step (third step). Therefore, the manufacturing cost of the elbow type hollow pipe joint 100 can be further reduced.
Further, since the second resin J2 is injected from the portion corresponding to the molding rib 114 to seal the gas injection hole, the second resin J2 is suppressed from blowing through into the hollow layer 110T, and the gas injection hole is stabilized. Can be sealed.
As a result, the elbow type hollow pipe joint 100 having high heat insulation performance can be efficiently and stably manufactured.

Further, according to the pipe joint manufacturing method according to the first embodiment, after the insert members 125 and 135 are arranged at the portions corresponding to the first pipe end portion 120 and the second pipe end portion 130 of the injection molding die C100. Since the injection molding configuration (first step) is performed, the insert members 125 and 135 can be arranged in the elbow type hollow pipe joint 100 without inserting and inserting the insert members 125 and 135.

<Modification Example (First Embodiment>
Next, with reference to FIG. 6, a manufacturing method according to a modified example of the elbow type hollow joint (pipe joint) will be described.
FIG. 6 is a conceptual diagram illustrating an outline of a manufacturing method according to a modified example of an elbow type hollow joint (pipe joint).
The molded product 100B of the elbow type hollow joint according to the modified example is manufactured by, for example, injection molding.
In FIG. 6, reference numeral 100B is a molded product for molding the elbow type hollow joint 100, reference numeral 120N is an injection path formed at the end portion 120 of the second pipe, and reference numeral M is a first resin J1 and a gas G. , And the one to be filled in the injection molding die containing the second resin J2.

The elbow type hollow joint (molded product) 100B differs from the elbow type hollow joint 100 in that the injection port 120N is formed on the solid pipe wall portion of the second pipe end portion 120, and the other parts are the first. Since it is the same as the elbow type hollow joint 100 according to the embodiment, the description thereof will be omitted.

The form (for example, position, number) of the injection path 120N can be arbitrarily set.

In injection molding, for example, in the resin injection step (first step), the heated and melted resin is injected into the injection molding mold via the injection path 120N, and then in the gas injection step (second step), the inside of the cavity is injected. A gas (for example, an inert gas) is injected into the resin injected into the seal, and the gas injection hole formed when the hollow layer is formed in the sealing resin injection step (third step) is sealed. After cooling, the molded product is taken out from the injection molding mold.
Further, in this embodiment, before the resin injection step (first step), the insert member is arranged at the corresponding portions of the first pipe end portion and the second pipe end portion (not shown), and then the injection molding die is formed. Mold.

(1) Resin injection process (first process)
First, the first resin J1 forming the elbow type hollow joint 100 is injected from the injection path 120N shown in FIG. 6 in the direction indicated by the arrow M. At this time, it is preferable that the opening of the injection port 120N does not face the cavity C110 for forming the outer peripheral wall portion 112.
The filling amount of the first resin J1 can be appropriately set.

(2) Gas injection process (second process)
Next, the gas G forming the hollow layer 110T is injected into the first resin injected in the resin injection step (first step) in the direction indicated by the arrow M via the injection path 120N.
The injection amount of Gus G can be appropriately set.

(3) Sealing resin injection process (third process)
Next, the second resin J2 for sealing the gas injection hole (not shown) is injected through the injection path 120C in the direction indicated by the arrow M.
As a result, the gas injection hole is sealed with the second resin J2.
The injection pressure and injection amount of the second resin J2 are set so as not to blow through the hollow layer 110T after injection.

Then, after the molded product is cooled to a predetermined temperature, the molded product 100B is taken out from the injection molding die, and the injection path 120N is cut and removed.

According to the pipe joint manufacturing method according to the modified example of the first embodiment, the solid pipe wall portion (thickness t2) of the first pipe end portion (receptacle portion) 120 thinner than the thickness t1 of the curved pipe portion 110. In the gas injection step (second step), the injection path 120C is formed in the hollow layer by injecting gas G into the inside of the first resin J1 ejected from the injection path 120N in the resin injection step (first step). Since 110T is formed and the second resin J2 is injected from the injection path in the sealing resin injection step (third step) to seal the gas injection hole, the gas injection hole can be efficiently sealed. It is possible to reduce the manufacturing cost of pipe fittings.

Further, since the gas injection path 120N is formed in the solid wall portion of the first pipe end portion 120, it is not necessary to form the gas injection hole in the outer peripheral wall portion 112 of the curved pipe portion 110, and the hollow layer. No seams or holes are formed in the outer peripheral wall portion of the curved pipe portion 110 in which the 110T is formed, and the hollow layer 110T independent of the outside can be stably formed.

Further, in the sealing resin injection step (third step), the second resin J2 is injected through the solid pipe wall portion of the first pipe end portion 120 to seal the gas injection hole, so that the second resin J2 is sealed. Is solidified at a relatively early timing and is prevented from blowing through into the hollow layer 110T formed in the curved tube portion 110, so that the gas injection hole can be stably sealed.
As a result, the elbow type hollow joint 100 having high heat insulation performance can be efficiently and stably manufactured.
<Second Embodiment>
Hereinafter, the first embodiment of the present invention will be described with reference to FIG. 7.
FIG. 7 is a schematic configuration diagram illustrating an example of a schematic configuration of an elbow type hollow joint according to a second embodiment of the present invention.
In FIG. 7, reference numeral 200 is an elbow type hollow joint (pipe joint), reference numeral 210 is a curved pipe portion (joint body), reference numeral 220 is a first pipe end portion (receptacle portion), and reference numeral 230 is a second pipe. Reference numeral 210T indicates a hollow layer, and reference numeral 225 or 235 indicates an insert member.

As shown in FIG. 7, the elbow type hollow joint (pipe joint) 200 includes a curved pipe portion (joint body) 210, a first pipe end portion (receptacle portion) 220, and a second pipe end portion (receptacle portion). ) 230, a hollow layer 210T, and insert members 225 and 235, and the curved pipe portion 210, the first pipe end portion 220, and the second pipe end portion 230 are formed along the pipe shaft O.
Further, in the elbow type hollow joint (pipe joint) 200, a through hole 200H through which drain passes is formed inward along the pipe shaft O.

Since the material for forming the elbow type hollow joint 200 is the same as that of the first embodiment, the description thereof will be omitted.
Further, it is more preferable that a part or all of the elbow type hollow joint 200 (particularly, the first pipe end portion 120 and the second pipe end portion 130) is transparent.

As shown in FIG. 7, for the curved pipe portion (joint body) 210, for example, the first pipe end portion (receptacle portion) 220 is connected to one end side in the pipe axis O direction, and the second pipe end is connected to the other end side. A unit (receptacle unit) 230 is connected.
Further, as shown in FIG. 7, the curved pipe portion 210 has, for example, a hollow portion 210T arranged between the inner peripheral wall portion 211 and the outer peripheral wall portion 212 on the outer side S2 of the curved portion formed by the curved pipe portion 210. It is formed.
In this embodiment, the solid pipe wall portion 113 is formed on the inner side S1 of the curved pipe portion 210, and the hollow portion 210T is not formed.

Further, as shown in FIG. 7, the curved pipe portion 210 intersects the first pipe end portion (receptacle portion) 220 and the second pipe end portion (receptacle portion) 230 with each other at an angle of 90 in a side view. It is configured to intersect at ° and project from the inner side S1 to the outer side S2 of the curved shape (curved portion) constituting the curved pipe portion 210.

Further, as shown in FIG. 7, the inner diameter dimension of the curved pipe portion 210 is formed so that the radius from the pipe shaft O is R211.
Further, as for the outer diameter dimension of the curved pipe portion 210, the radius from the pipe shaft O is formed in R212.
The thickness t1 of the curved pipe portion 210 (including the hollow portion 210T) can be defined by (outer diameter dimension R212) − (inner diameter dimension R211).
In this embodiment, the thickness t1 of the curved tube portion 210 is formed to be, for example, 25 mm.
In order to form the hollow layer 210T in the curved tube portion 210 by injection molding, the thickness t1 of the curved tube portion 210 is preferably set to, for example, 6 mm to 30 mm.

The first pipe end portion (receptacle portion) 220 includes a tubular pipe wall portion connected to one end side of the curved pipe portion 210.
Further, in the first pipe end portion (receptacle portion) 220, for example, an insert member 225 is arranged on the inner peripheral side of the pipe wall portion.
Whether or not to arrange the insert member 225 can be arbitrarily set, but when the elbow type hollow joint 200 is made of a material such as PE or PP that cannot be joined by an adhesive, the insert member 225 It is preferable to arrange.

In the second embodiment, the first pipe end portion (receptacle portion) 220 is an insertion port of a member (for example, a flexible hose 5 or a connecting member 7) constituting a drain piping structure for air conditioning equipment along a pipe shaft O1. When P1 is fitted and inserted on the inner peripheral side of the insert member 225, the insertion port P1 is seated on the bottom 220B of the insert member 225 via the foam packing P11.

In this embodiment, the pipe wall portion of the first pipe end portion (receptacle portion) 220 is solidly formed over the entire length.
Further, the outer diameter dimension of the first pipe end portion (receptacle portion) 220 is smaller than the outer diameter dimension R212 of the curved pipe portion 210, for example, the pipe shaft O (radius from O1 is formed in R222) over the entire length. It is formed.
Further, the inner diameter of the first pipe end portion (receptacle portion) 220 is formed so that the radius from the pipe shaft O is R121.

The thickness t220 (t2) of the solid pipe wall portion of the first pipe end portion (receptacle portion) 220 can be defined by the outer diameter dimension R222-inner diameter dimension R221.

Further, in this embodiment, the thickness t220 (t2) of the solid pipe wall portion of the first pipe end portion (receptacle portion) 220 is set to, for example, 1.0 mm or more.
The thickness t220 of the solidly formed portion is preferably set to, for example, 1.0 mm to 10 mm in order to stably form the solid pipe wall portion and to secure the strength of the receiving portion. Is.

Further, the thickness t220 (t2) of the first pipe end portion (receptacle portion) 220 is when the thickness of the wall portion of the curved pipe portion 210 is t1.
It is formed so that 0.04 × t1 ≦ t220 (t2) <0.8 × t1.
The thickness 220 (t2) of the solidly formed portion is, for example,
0.08 x t1 ≤ t220 (t2) <0.5 x t1
It is more preferable to set to
0.1 × t1 ≦ t220 (t2) <0.4 × t1
It is more preferable to set to.

In the insert member 225, for example, an elbow type hollow joint (pipe joint) 200 is mounted on the inner peripheral side of the first pipe end portion (receptacle portion) 220.
Further, the material for forming the insert member 225 is the same as that of the first embodiment, and thus the description thereof will be omitted.

The second pipe end portion (receptacle portion) 230 includes a tubular pipe wall portion connected to the other end side of the curved pipe portion 210.
Further, in the second pipe end portion (receptacle portion) 230, for example, an insert member 235 is arranged on the inner peripheral side of the pipe wall portion.
Whether or not to arrange the insert member 235 can be arbitrarily set, but when the elbow type hollow joint 200 is made of a material that cannot be joined by an adhesive, the insert member 235 can be arranged. Suitable.

In this embodiment, the pipe wall portion of the second pipe end portion (receptacle portion) 230 is solidly formed over the entire length.
Further, the outer diameter dimension of the second pipe end portion (receptacle portion) 230 is smaller than the outer diameter dimension R212 of the curved pipe portion 210, for example, the pipe shaft O (radius from O1 is formed in R222) over the entire length. It is formed.
Further, the inner diameter of the second pipe end portion (receptacle portion) 230 is formed so that the radius from the pipe shaft O is R121.

The thickness t230 (t2) of the solid pipe wall portion of the second pipe end portion (receptacle portion) 230 can be defined by the outer diameter dimension R232-inner diameter dimension R231.

Further, in this embodiment, the thickness t220 (t2) of the solid pipe wall portion of the second pipe end portion (receptacle portion) 320 is set to, for example, 1.0 mm or more.
The thickness t220 of the solidly formed portion is preferably set to, for example, 1.0 mm to 10 mm in order to stably form the solid pipe wall portion and to secure the strength of the receiving portion. Is.

Further, the thickness t230 (t2) of the second pipe end portion (receptacle portion) 230 is when the thickness of the wall portion of the curved pipe portion 210 is t1.
It is formed so that 0.04 × t1 ≦ t230 (t2) <0.8 × t1.
The thickness t230 (t2) of the solidly formed portion is, for example,
0.08 x t1 ≤ t230 (t2) <0.5 x t1
It is more preferable to set to
0.1 × t1 ≦ t230 (t2) <0.4 × t1
It is more preferable to set to.

The insert member 235 has, for example, an elbow type hollow joint (pipe joint) 200 mounted on the inner peripheral side of the first pipe end portion (receptacle portion) 220.
Further, the material for forming the insert member 235 is the same as that of the first embodiment, and thus the description thereof will be omitted.

Further, in the second pipe end portion (receptacle portion) 230, an insertion port P2 of a member (for example, a flexible hose 5 or a connecting member 7) constituting a drain piping structure for air conditioning equipment is an insert member 235 along the pipe shaft O2. When the insertion port P2 is fitted on the inner peripheral side of the insert member 235, the insertion port P2 is seated on the bottom portion 230B of the insert member 235 via the packing P21.

As shown in FIG. 7, the hollow layer 210T is different from the bottom 220B of the socket of the first pipe end (receptacle) 220 in the second embodiment, for example, in the pipe axis O direction. It is formed up to a position toward the front (closer to the center in the direction of the pipe axis O), and is also formed up to a position in front of the bottom portion 230B of the socket of the second pipe end portion (receptacle portion) 230.

Further, in the second embodiment, the hollow layer 210T is arranged between the inner peripheral wall portion 211 located on the through hole 200H side in the curved pipe portion 210 and the outer peripheral wall portion 212.
Further, the hollow layer 210T is not arranged inside S1 of the curved portion formed by the curved pipe portion 220. That is, the hollow layer 210T is formed in a part of the curved pipe portion 210 in the circumferential direction.
Others are the same as those in the first embodiment, and thus the description thereof will be omitted.

According to the elbow type hollow joint 200 according to the second embodiment, when the packings P21 and P22 are used, the hollow portion is not formed on the outer peripheral side of the first pipe end portion 220 and the second pipe end portion 230. Even if there is, it is possible to suppress the dew condensation of the drain.
Others are the same as those of the first embodiment and the second embodiment, and thus the description thereof will be omitted.

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

For example, in the above embodiment, for example, the case where the elbow type hollow joints (pipe joints) 100 and 200 are provided with an insert member has been described, but whether or not the elbow type hollow joint (pipe joint) 100 and 200 are provided with an insert member can be arbitrarily set. For example, the configuration may not include an insert member.

Further, in the above embodiment, the case where the pipe joint is an elbow type hollow joint 100 or 200 has been described, but the present invention may be applied to various other pipe joints (for example, sockets, cheese, etc.). ..

Further, in the above embodiment, the elbow type hollow joint (pipe joint) 100 includes the hollow layer 110T, the hollow layer 110T is formed over the entire circumference of the curved pipe portion (joint body) 110 in the circumferential direction, and the pipe shaft O In the direction, the first pipe end extends from the bottoms 120B and 130B of the first pipe end 120 and the second pipe end 130 to the openings 120A and 130B, and insulates the outer periphery of the receiving port over the entire circumference in the circumferential direction. The case where the hollow portion 120T and the second pipe end hollow portion 130T are provided has been described. For example, the pipe end hollow portion is formed only in either the first pipe end portion 120 or the second pipe end portion 130. Alternatively, the hollow layer formed over the entire circumference in the circumferential direction may be formed only on the joint body.
Further, either one or both of the first pipe end portion 120 and the second pipe end portion 130 may be partially formed in the circumferential direction.

Further, in the above embodiment, the elbow type hollow joint (pipe joint) 200 is provided with the hollow layer 210T, and the hollow layer 210T is formed as a partial enemy in the circumferential direction of the curved pipe portion (joint body) 210, and the pipe shaft. The case where the first pipe end 220 and the second pipe end 230 are formed in front of the bottom in the O direction has been described. For example, a hollow layer formed in a partial enemy in the circumferential direction is formed in the first pipe. A pipe end hollow portion may be formed at either one or both of the end portion 220 and the second pipe end portion 230.
Further, the hollow layer formed over the entire circumference in the circumferential direction and the hollow layer partially formed in the circumferential direction may be formed in a dimension shorter than the length of the joint body in the iron axis O direction.

Further, in the above embodiment, the case where the insert member is arranged on the inner peripheral side of the receiving portion and the insert member is arranged before molding the receiving portion (for example, injection molding) has been described. For example, after forming the pipe joint, the insert member may be inserted and joined (for example, adhesive).

Further, in the above embodiment, a case where the gas injection hole formed in the gas injection step (second step) is sealed by injecting the second resin in the sealing resin injection step (third step) has been described. However, the sealing of the gas injection hole may be arbitrarily set. For example, after the molded product in which the gas injection hole remains is taken out from the molding die, a resin for sealing is filled to form the gas injection hole. It may be sealed.

Further, in the above embodiment, in the resin injection step (first step), the first resin J1 is placed in the cavity C100 via the molding rib 114 of the molded product 100A formed in the resin molding die and the corresponding runner C144. Although the case of filling has been described, for example, the first resin may be directly injected from the portion corresponding to the joint body of the cavity C100.

Further, in the above embodiment, the case where the molded product is provided with the molding rib 114 formed along the pipe axis O direction as the protruding portion has been described, but the protruding portion may be arbitrarily set. For example, it may be formed along a direction orthogonal to the pipe axis O, or it may be formed in a dot shape. Further, in such a case, the position and number of the protruding portions may be arbitrarily set.

Further, the protruding portion of the molding rib 114 or the like used for resin injection or gas injection may be removed by cutting or the like after being taken out from the molding die, or may be left as a part of the pipe joint. May be good.

Regarding the resin injection in the resin injection step (first step), for example, the resin may be injected directly into the cavity from the outer peripheral surface side of the joint body, may be injected into the cavity via the runner, or the nozzle may be injected. It may be injected into the cavity through.
Further, the resin-filled portion and the gas-injected portion may be formed at different positions.

Further, in the second step, the gas injection site is preferable in that the resin and the gas injection path can be shared by injecting the resin from the resin injection site in the first step. Gas may be injected from a part other than the part where the resin is injected.

Further, when forming the elbow type hollow joints 100 and 200, for example, by forming using PP and PE having low specific gravity, high chemical resistance and high heat insulation, practical performance higher than that of vinyl chloride resin and ABS is ensured. You may.

Further, in the above embodiment, the case where the injection path is formed in the receiving port portion is described in the case where the injection path is formed in the first pipe end portion 120, but the injection path may be formed in the second pipe end portion 130. It may be formed on both the pipe end portion 120 and the second pipe end portion 130.
Further, the injection path may be formed in either or both of the first pipe end portion 120 and the second pipe end portion 130 together with the molding rib 144.

In addition, it is possible to replace the constituent elements in the above-described embodiment with well-known constituent elements as appropriate without departing from the spirit of the present invention, and the above-described embodiments may be appropriately combined and applied.

O Pipe shaft O1 1st pipe shaft O2 2nd pipe shaft 1 Drain piping structure for air conditioning equipment 100 Elbow type hollow joint (pipe joint)
100A, 100B Molded product 200 Elbow type hollow fitting (pipe fitting)
110, 210 Curved pipe part (joint body)
120, 220 1st pipe end (receptacle)
130, 230 2nd pipe end (receptacle)
110T, 210T Hollow layer 125, 135, 225, 235 Insert member

Claims (10)

The joint body formed in a tubular shape and
The socket connected to the joint body and
It is a pipe fitting equipped with
A hollow layer formed in the joint body is provided.
When the thickness of the joint body is t1,
The thickness t2 of the solid pipe wall portion of the receiving portion is
0.04 x t1 ≤ t2 <0.8 x t1
A pipe fitting characterized by being formed in. The pipe fitting according to claim 1.
A pipe joint characterized in that the hollow layer extends from the bottom of the receiving portion to the outer periphery on the opening side. The pipe fitting according to claim 1 or 2.
A pipe joint characterized in that an insert member is arranged on the inner peripheral side of the receiving portion. The pipe fitting according to any one of claims 1 to 3.
A pipe joint characterized in that ribs protruding outward are formed on the outer surface of the outer peripheral wall portion of the hollow layer. The pipe fitting according to claim 4.
A pipe joint characterized in that the thickness of the rib is formed to be smaller than the thickness of the outer peripheral wall portion. A drain pipe structure for air conditioning equipment, which comprises the pipe joint according to any one of claims 1 to 5. A pipe joint manufacturing method for manufacturing the pipe joint according to any one of claims 1 to 5.
The first step of injecting the resin for forming the pipe joint into the molding die in which the cavity corresponding to the pipe joint is formed, and
The second step of injecting gas into the resin injected in the first step to form a hollow layer in the joint body, and the second step.
A pipe joint manufacturing method, characterized in that it is provided with. The pipe fitting manufacturing method according to claim 7.
The molding die is formed with a protruding portion that protrudes outward from the outer surface of the outer peripheral wall portion of the joint body in the pipe joint after molding.
With respect to the molding die in which the protruding portion is formed,
In the second step, gas is injected into the resin ejected in the first step from a portion corresponding to the protruding portion to form the hollow layer.
After the second step,
A third step of injecting resin from a portion corresponding to the protruding portion and sealing the gas injection hole formed when the gas is injected.
A pipe joint manufacturing method characterized by being provided. The pipe fitting manufacturing method according to claim 7.
The molding die is formed with an injection path for injecting the gas from the outer surface of the solid pipe wall portion of the socket portion of the pipe joint.
In the second step, gas is injected into the resin ejected in the first step from the injection path to form the hollow layer.
After the second step,
A third step of injecting resin from the injection path and sealing the gas injection hole formed when the gas is injected is performed.
A pipe joint manufacturing method characterized by being provided. The pipe joint manufacturing method according to any one of claims 7 to 9.
After arranging the insert member at the portion corresponding to the receiving portion of the molding die,
A pipe joint manufacturing method, characterized in that the first step is performed.

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