JP5654743B2 - Pipe fitting - Google Patents

Description

  The present invention relates to a cheese-type pipe joint having a receiving port for connecting pipes to each other, and in particular, the whole is formed of a synthetic resin having a transparent or translucent light-transmitting property. The present invention relates to a pipe joint having a heat insulating layer formed of a foamable resin inside.

  Conventionally, a technology that makes it possible to see the connection state of a pipe from the outside by forming a pipe joint that connects the pipes with a transparent synthetic resin and adhesively bonding with a colored adhesive, for example, patent It is known from Document 1 and the like.

  In addition, as a technique used for drain drain pipes of air conditioners, etc., in pipe joints, a heat insulating layer made of foamed resin (that is, the center layer is a foamed layer) inside the body part excluding the receiving part for inserting the pipe. Patent Document 2 discloses a technique for providing a heat insulating property and preventing condensation without providing a heat insulating material such as glass wool on the outer periphery by providing a non-foamed layer sandwich structure for the inner and outer layers. ing.

JP-A-11-101382 Japanese Patent No. 3699579

The inventors of the present application tried to provide a foam heat insulating layer on a pipe joint formed of a transparent resin by combining the above-described techniques.
At this time, the inventors of the present application have found the following new problems to be solved.
That is, when providing a heat insulation layer in transparent resin, since the resin which forms a heat insulation layer is made to foam, the bubble part loses light transmittance and prevents internal visibility. For this reason, it is necessary to prevent the resin forming the heat insulating layer from reaching the receiving port, and in order to ensure heat insulation, the heat insulating layer is surely provided in the entire region of the joint body other than the receiving port. There is a need.

  For this reason, it is necessary to adjust the filling amount of the non-foaming resin, the filling amount of the foaming resin, the injection molding pressure, etc., but in the cheese-like pipe joint having the receiving port in three directions, these adjustments are not enough. As described above, it is difficult to provide a heat insulating layer only in the entire area of the wall thickness of the joint body excluding the receiving portion.

This problem will be described with reference to FIG.
A cheese-type pipe joint 01 shown in FIG. 5 includes a joint body 02 having a substantially inverted T shape, and includes a pair of receiving ports 03 and 04 coaxially at both ends of a main pipe portion 02a having both ends opened in the joint body 02. A receiving port 05 is provided at the upper end of the branch pipe part 02b extending in the direction perpendicular to the axis at the axial center position of the main pipe part 02a.

  When a foam heat insulating layer is formed on the joint body 02 of such a pipe joint 01 by the technique described in Patent Document 2, a position indicated by an arrow SO in the drawing (this position is hereinafter referred to as an injection position SO). That is, the resin is injected from the position facing the branch pipe portion 02b at the axial center position in the main pipe portion 02a. In this case, first, a non-foamable resin is injected by a filling amount smaller than the mold cavity capacity (that is, short shot injection), and then the foamable resin is injected and pressurized. As a result, the foamable resin is rolled into the non-foamable resin on the inner and outer surfaces of the cavity to fill the joint body 02.

Since such a conventional pipe joint 01 was not a mold design in consideration of foaming of foamable resin, such as the length 0L1 in the axial direction, the length 0L2 in the direction perpendicular to the axis, and the thickness dimension of the main body, It was difficult to spread the resin only inside the wall thickness of the joint body 02 over the entire area and to provide a heat insulating layer over the entire area of the joint body 02 excluding the receiving port.
That is, in the pipe joint 01 shown in FIG. 5, when the foamable resin is set so as to sufficiently spread to the joint main body 02 just before the receiving ports 03 and 04 at both ends of the main pipe part 02 a, the branch pipe part 02 b In some cases, the heat insulation layer was not formed without sufficiently spreading. In this case, the heat insulating property of the joint main body 02 is insufficient, and when a low-temperature fluid is flowed, condensation occurs in the branch pipe portion 02b that does not have the heat insulating layer in the joint main body 02.

  On the contrary, when the heat insulating layer is formed just before the receiving port 05 of the branch pipe part 02b, the foamable resin in the main pipe part 02a becomes excessive, and the heat insulating layer is formed up to the receiving ports 03 and 04. The In this case, since the bubble part by foaming of a heat insulation layer prevents light transmission, the visibility of the adhesion state in the receptacles 03 and 04 deteriorates.

  The present invention has been made by the inventors of the present invention finding a new problem as described above. Each receiving port is formed of a light-transmitting synthetic resin, and the tube at the receiving port is formed. It is an object of the present invention to provide a novel pipe joint in which a foamed heat insulating layer can be provided inside the wall thickness of the entire area of the joint body excluding the receiving port while making the adhesion state visible.

In order to achieve the above-described object, the present invention provides a joint body including a main pipe portion that is open at both ends in the axial direction, and a branch pipe portion that is open at one side of the main pipe portion in the direction orthogonal to the axis. A non-foamed resin in which a first receiving port and a second receiving port are provided coaxially at both ends, a third receiving port is provided at the tip of the branch pipe portion, and each receiving port has transparent or translucent light transmissivity. A cheese-like pipe joint provided with a heat insulation layer formed of a foamable resin inside the wall thickness of the joint body, wherein the branch pipe part is provided at the center in the axial direction of the main pipe part. The position of the main pipe portion opposite to the injection position is set as the resin injection position, the main pipe portion flow ratio from the injection position to the first receiving port and the second receiving port, and the injection position from the injection position to the first position. The ratio of the branch pipe section flow ratio up to three receiving ports, and the ratio of the main pipe section flow ratio / branch pipe section flow ratio Values, along with being in the range of 0.9 to 1.1, than the main portion axial dimension from the injection position to the first receptacle and the second receptacle, the first from the injection position 3 The dimension of the main pipe portion axis orthogonal direction to the receiving port is formed longer and the third from the injection position than the thickness of the main pipe portion from the injection position to the first receiving port and the second receiving port. towards the thickness of the branch pipe portion to the socket is formed thick, the thickness of the branch pipe portion and characterized in that it is gradually thicker toward the front Symbol injection position to said third receptacle Pipe fittings to be used.

  In the pipe joint of the present invention, when the pipe joint is formed by injection molding, it is transparent or semi-transparent with the main pipe part axis orthogonal direction opposite to the branch pipe part being the center in the axial direction of the main pipe part. After the non-foaming resin having light transmittance is injected, the foaming resin is injected.

In this case, in the joint body, the main pipe portion flow ratio, which is the flow ratio from the injection position in the mold cavity to the first receiving port and the second receiving port of the main pipe portion, and the branch pipe flow from the injection position to the third receiving port. Since the ratio to the ratio is set in the range of 0.9 to 1.1, the injected resin is substantially uniform toward the first receiving port, the second receiving port, and the third receiving port. Supplied under proper flow conditions.
Therefore, it is possible to adjust the foamable resin so that it reaches just before the first receiving port, the second receiving port, and the third receiving port and reaches the entire joint body.
Thereby, the heat insulation layer can be provided in the whole area of a joint main body except a mouth, forming the whole pipe joint with the synthetic resin which has optical transparency, and making the adhesion state of the pipe in a mouth visible. A new pipe joint can be provided.

In the first aspect of the present invention, the dimension of the main pipe part axis orthogonal direction from the injection position to the third receiving port is longer than the dimension of the main pipe part axis direction from the injection position to the first receiving port and the second receiving port. Even if it is formed, the thickness of the latter can be made thicker than the thickness of the former, and the main pipe part flow ratio / branch pipe part flow ratio can be set within the range of 0.9 to 1.1. Therefore, even if there is a restriction on the dimensions of the joint body, the above effect can be obtained by setting the desired flow ratio. In addition, since the dimensions of the joint body are not changed, the existing mold can be used.

It is a side view which shows the pipe joint A of Example 1 of embodiment of this invention. It is sectional drawing which shows the pipe joint A of the said Example 1, Comprising: The state cut | disconnected by S2-S2 of FIG. 1 is shown. It is a side view which shows the pipe joint B of Example 2. FIG. It is sectional drawing which shows the pipe joint B of the said Example 2, Comprising: The state cut | disconnected by S4-S4 of FIG. 3 is shown. It is explanatory drawing of the problem of the conventional pipe joint.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
In the pipe joint of the present embodiment, the joint body (10) has a main pipe part (11) opened at both ends in the axial direction, and a branch pipe part (12) opened at one of the main pipe parts (11) in the direction perpendicular to the axis. And a first receiving port (21) and a second receiving port (22) are provided coaxially at both ends of the main pipe (11), and a third receiving port (12) is provided at the tip of the branch pipe (12). 23) a cheese-like pipe joint, wherein the joint body (10) and the receiving ports (21, 22, 23) are made of a non-foamed resin having a transparent or translucent light transmission property. A heat insulating layer (10a) formed of a foamable resin is provided inside the wall thickness of the joint body (10), and is the axial center of the main pipe portion (11) in the mold cavity, and the branch Axial orthogonal direction of the main pipe portion (11) on the opposite side to the pipe portion (12). The injection position (SO) of the resin is defined as the main pipe portion flow ratio from the injection position (SO) to the first receiving port (21) and the second receiving port (22), and from the injection position (SO). The value of the main pipe part flow ratio / branch pipe part flow ratio, which is the ratio of the branch pipe part flow ratio up to the third receiving port (23), is set in the range of 0.9 to 1.1. It is a pipe joint characterized by this.

Below, based on FIG. 1 and FIG. 2, the pipe joint A of Example 1 of embodiment of this invention is demonstrated.
The pipe joint A of the first embodiment is a type of pipe joint called a cheese, and includes a joint body 10, a first receiving port 21, a second receiving port 22, and a third receiving port 23. Yes.

  The joint body 10 includes a substantially cylindrical main pipe portion 11 having an axial direction (arrow Ya direction) in the left-right direction in FIG. 1 and a substantially cylindrical shape extending from the center of the main pipe portion 11 in the axial direction. And a branched branch pipe portion 12.

Furthermore, as shown in FIG. 2, the joint body 10 is formed in a cross-sectional structure in which the heat insulating layer 10a is sandwiched between the general layers 10b. The general layer 10b is formed of a non-foamable resin having a transparent or translucent light transmittance. On the other hand, the heat insulation layer 10a is formed of a foamable resin.
In addition, as non-foamable resin, as described in Patent Document 2, polyvinyl chloride, ABS (acrylonitrile-butadiene-styrene) resin, AES (acrylonitrile-EPDM (ethylene-propylene rubber) -styrene) Resin, polyethylene, polypropylene, acrylic resin, or the like can be used.
Also, as described in Patent Document 2, as the foamable resin, a mixture 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.

Each of the receiving ports 21, 22, and 23 is formed of only the above-described general layer 10 b, and the inside can be seen from the outside. The heat insulating layer 10a has light shielding properties due to the presence of bubbles generated by firing, and the inside cannot be seen from the outside. Therefore, the joint body 10 has a light shielding property.
Here, the third receiving port 23 shown in the cross-sectional view of FIG. 2 will be described. The third receiving port 23 is provided at the tip of the branch pipe part 12 and has a larger diameter than the branch pipe part 12. In addition to being formed in a cylindrical shape, a stopper abutment surface 23a that abuts the tip end surface of the connecting pipe P when it is inserted and connected is formed in a direction perpendicular to the branch pipe axis direction indicated by arrow Yb. .

  Returning to FIG. 1, the first receiving port 21 and the second receiving port 22 are provided at both ends of the main tube portion 11 in the main tube portion axial direction, and are formed in a cylindrical shape having the same inner diameter as the third receiving port 23. In addition, a stopper abutting surface similar to the third receiving port 23 is provided although illustration is omitted.

  Here, when the pipe joint A is molded, the injection port for injecting the resin material in the cavity of the mold (not shown) for molding the pipe joint A is the injection position indicated by the arrow SO in FIG. 11, the central position in the axial direction of the main pipe portion is disposed at a position overlapping with the main pipe portion axis orthogonal direction (branch pipe portion axis) on the opposite side from where the branch pipe portion 12 is provided.

In the main pipe part 11, the main pipe part axial dimensions L1 and L2 from the injection position SO to the first receiving port 21 and the second receiving port 22 are formed equally. Further, in the branch pipe part 12, the main pipe part axis orthogonal direction dimension L3 from the injection position SO to the third receiving port 23 is set equal to the aforementioned dimensions L1 and L2. In addition, the dimension of these L1, L2, L3 is 60 mm in the case of the joint which connects the connecting pipe P with a diameter of 40 mm if an example is given.
Further, the wall thickness t of the joint main body is formed substantially uniformly as a whole as shown in FIG. The wall thickness t is a value of about t = 10 mm, for example.

Each flow ratio R of the resin material is determined by the main pipe portion axis direction dimensions L1 and L2, the main pipe portion axis orthogonal direction dimension L3, and the wall thickness t. That is, the flow ratios R1, R2 from the injection position SO to the first receiving port 21 and the second receiving port 22 in the cavity of the molding die (not shown) for forming the pipe joint A of the first embodiment are R1 = L1 / t = R2 = L2 / t. The flow ratios R1 and R2 are referred to as main pipe portion flow ratios.
Further, the flow ratio R3 from the injection position SO to the third receiving port 23 is R3 = L3 / t, which is referred to as a branch pipe portion flow ratio.
Since the dimensions L1, L2, and L3 are L1 = L2 = L3, the ratio between the main pipe part flow ratios R1 and R2 and the branch pipe part flow ratio R3 (main pipe part flow ratio / branch pipe). The values of R1 / R3 and R2 / R3, which are partial flow ratios, are each = 1, and are set so as to be within the range of 0.9 to 1.1 even if there is some dimensional error. The numerical values of R1, R2, and R3 are not limited as long as the molten resin can be filled up to the receiving end. Most preferred is 1.

Next, the effect | action of the pipe joint A of Example 1 is demonstrated.
When the pipe joint A is molded, a resin material is injected from the injection position SO of the pipe joint A toward the cavity of the mold.
In this case, as described in Patent Document 2, first, after injecting a predetermined amount of non-foamable resin smaller than the mold cavity capacity, a predetermined foamable resin is injected, Pressurize.

Here, in the pipe joint A of the first embodiment, the main pipe portion flow ratios R1 and R2 from the injection position SO to the first receiving port 21 and the second receiving port 22, and the branch pipe portion flow ratio to the third receiving port 23. The main pipe axis direction dimensions L1, L2, the main pipe axis orthogonal direction dimension L3, and the wall thickness t are set so that R3 is equal.
For this reason, the foamable resin is supplied substantially evenly toward the receiving ports 21, 22, and 23. Therefore, it is possible to prevent the foamable resin from entering the receiving ports 21, 22, and 23 while spreading the entire joint body 10, thereby insulating only the joint body 10 over the entire body. Layer 10a is formed within the wall thickness. As shown in FIG. 2, the heat insulating layer 10a is adjusted so that the outer diameter of the third receiving port 23 reaches a position where it is larger than the branch pipe portion 12, but does not reach the stopper abutting surface 23a. Has been. Although not shown, even in the first receiving port 21 and the second receiving port 22, the heat insulating layer 10 a extends to a position where the outer diameter dimension of each of the receiving ports 21 and 22 is larger than that of the main pipe portion 11. However, it is adjusted so as not to reach the stopper abutting surface 23a.
In addition, in providing the heat insulation layer 10a over the entire thickness of the joint body 10 in this way, the amount of non-foamable resin and foamable resin material, the foaming degree of the foamable resin, and the amount of pressurization are determined. It is necessary to set optimally.

  Moreover, in the pipe joint A of Example 1 formed in this way, the heat insulating layer 10a is appropriate because the general layer 10b is formed of a transparent or translucent resin having light transmittance. The presence or absence of defective products (such as when the heat insulation layer 10a protrudes to the receiving ports 21, 22, 23) can be visually confirmed.

Next, the use time of the pipe joint A will be described.
Since the pipe joint A has the heat insulating layer 10a, the pipe joint A is suitable for use in a drain drain pipe of an air conditioner (not shown). For such drain drain piping, a pipe having a heat insulating layer in the wall thickness is also used for the connecting pipe P connected to the pipe joint A.

When the connection pipe P is connected, after the adhesive is applied to each of the receiving ports 21, 22 and 23 of the pipe joint A and the connecting pipe P, each of the receiving ports 21 until the connecting pipe P hits the stopper abutting surface 23 a. , 22 and 23 to be connected.
At this time, each of the receiving ports 21, 22, 23 is formed of a transparent or translucent light-transmitting resin. Therefore, if a colored adhesive is used, the inner circumferences of the receiving ports 21, 22, 23 are all It is possible to confirm whether or not the coating is applied over the circumference, so that an inadvertent mistake of forgetting to bond can be prevented, and the occurrence of poor sealing due to insufficient application of the adhesive can also be prevented.

Further, the pipe joint A includes a heat insulating layer 10 a over the entire joint body 10. Therefore, when connecting pipes P such as straight pipes having the heat insulating layer 10 a are connected to the receiving ports 21, 22, 23, the drainage path for draining drainage is continuous between the connecting pipe and the joint body 10. Covered with a heat insulating layer. Therefore, it is possible to prevent the outer periphery of the pipe joint A and the connecting pipe P from condensing without covering the outer periphery with the heat insulating material, and saves the labor of the piping work compared with the case where the outer periphery is covered with the heat insulating material. be able to. In addition, between the heat insulation layer 10a and the connecting pipe P, the heat insulation is ensured because the thickness of the general layer 10b is thick.
Incidentally, when the heat insulating layer 10a is not provided on a part of the joint body 10 in the pipe joint A, there is a possibility that condensation occurs on the outer periphery of the part, but the occurrence of such a problem can be prevented.

  As described above, in the first embodiment, the pipe joint A is formed of a transparent or translucent resin having light transmissivity, and the insertion state of the connection pipe P at each of the receiving ports 21, 22, 23 is determined. It is possible to provide a novel pipe joint A in which the heat insulating layer 10a can be provided over the entire region of the joint body 10 excluding the receiving ports 21, 22, 23 while being visible.

(Other examples)
Hereinafter, other examples of the embodiment of the present invention will be described. Since the following embodiment is a modification of the first embodiment, only differences from the first embodiment will be described. When the same configuration as the first embodiment is illustrated, the same reference numerals as those of the first embodiment are used. A description will be omitted. Also, the description of the same effects as those of the first embodiment is omitted.

Next, the pipe joint B of Example 2 is demonstrated based on FIG. 3 and FIG.
The pipe joint B of the second embodiment is different in shape from that of the first embodiment.
That is, as shown in FIG. 3, the pipe joint B of the second embodiment has the main pipe portion axial dimensions L21 and L22 from the injection position SO to the first receiving port 221 and the second receiving port 222, and the first from the injection position SO. The main pipe portion axis orthogonal direction dimension L23 up to the three receiving ports 223 is greatly different, and is formed in a relationship of L21 = L22 <L23.

  In addition, each dimension L21, L22, and L23 described above is a value of about L21 = L22 = 35 mm and a value of about L23 = 65 mm, for example, in the case of a joint that connects the connecting pipe P having a diameter of 40 mm.

Further, as shown in FIG. 4, the thicknesses tα2 and tα3 of the branch pipe portion 212 of the joint body 210 are formed to be thicker than the thickness t of the main pipe portion 211 unlike the first embodiment, and As described above, the thickness is gradually increased from the portion of the thinnest injection position SO with the thickness t toward the third receiving port 223.
As a result, the outer diameter shape of the third receiving port 223 is also different from that of the first embodiment. In other words, the inner diameter of the third receiving port 223 and the size and shape of the stopper abutting surface 23a are the same as those of the first embodiment, but the outer shape is different, and the outer peripheral surface of the third receiving port 223 and the outer periphery of the branch pipe portion 212 are different. It is formed in a continuous shape without any step between the surface.

  In addition, the thickness of the joint main body 210 is a value of about t = 10 mm, for example. For example, when L21 = L22 = 35 mm and L23 = 65 mm, t = 10 mm, tα2 = 20 mm, and tα3 = 20 mm.

In the second embodiment, the main pipe portion flow ratio from the injection position SO to the first receiving port 221 and the second receiving port 222 is set to R21 = L21 / t and R22 = L22 / t.
Further, the branch pipe section flow ratio from the injection position SO to the third receiving port 223 is formed as R23 = L23 / tα3.

  And even in the second embodiment, the flow ratios R21 = R22 = R23 are satisfied, that is, the ratio of the main pipe portion flow ratio and the branch pipe portion flow ratio is in the range of 0.9 to 1.1. Is set to fit. Most preferred is 1.

Even in the pipe joint B of the second embodiment, as in the first embodiment, first, a non-foamable resin having light transmittance is injected from the injection position SO, and then a foamable resin is injected. A heat insulating layer 210a is formed inside the layer 210b.
Therefore, even in the pipe joint B of the second embodiment, the heat insulating layer 210a can visually recognize the connection state of the connection pipe P at each of the receiving ports 221, 222, and 223 without reaching the receiving ports 221, 222, and 223. However, the novel pipe joint B which can provide the heat insulation layer 210a in the whole joint main body 210 except each receiving port 221,222,223 can be provided. In the second embodiment, the heat insulating layer 210a increases in thickness as it approaches the third receiving port 223. Further, the thickness of the general layer 210b in the portion between the heat insulating layer 210a and the connecting pipe P is thick as in the first embodiment, and the heat insulating property is guaranteed.

Moreover, in the pipe joint B of Example 2, each dimension L21, L22, L23 can be diverted from the existing mold and only the width of the cavity can be changed. Although the embodiment and Example 1 of the present invention have been described in detail, the specific configuration is not limited to this embodiment and Example 1, and design changes that do not depart from the gist of the present invention are not limited to this. Included in the invention.

  For example, each main pipe axial dimension L1, L2, L21, L22 of each pipe joint, each main pipe axial orthogonal dimension L3, L23, inner and outer diameters, and each of the receiving ports 21, 22, 23, 221, 222, 223 The inner and outer diameters are not limited to those shown in the first and second embodiments. Further, the inner diameters of the receiving ports are not limited to those having the same diameter, but any or all of them can be formed to have different diameters.

  Further, the non-foamable resin and the foamable resin are not limited to those shown in the examples.

DESCRIPTION OF SYMBOLS 10 Joint main body 10a Heat insulation layer 10b General layer 11 Main pipe part 12 Branch pipe part 21 1st receiving port 22 2nd receiving port 23 3rd receiving port 210 Joint main body 210a Thermal insulation layer 210b General layer 211 Main pipe part 212 Branch pipe part 221 1st Receptacle 222 Second Receptacle 223 Third Receptacle A Pipe Fitting (of Example 1) Pipe Fitting (of Example 2) R1 Main Pipe Flow Ratio R2 Main Pipe Flow Ratio R3 Branch Pipe Flow Ratio R21 Main Pipe Flow Ratio R22 Main pipe flow ratio R23 Branch pipe flow ratio

Claims (1)

The joint body includes a main pipe portion that is open at both ends in the axial direction and a branch pipe portion that is open at one side of the main pipe portion in the direction orthogonal to the axis, and the first and second receiving ports are coaxially disposed at both ends of the main pipe portion. A mouth is provided, and a third receiving port is provided at the tip of the branch pipe part
Each receiving port is formed of a non-foamed resin having transparent or translucent light transmittance,
A cheese-like pipe joint provided with a heat insulating layer formed of a foamable resin inside the wall thickness of the joint body,
The position of the main pipe portion at the center in the axial direction of the main pipe portion and on the opposite side of the branch pipe portion is set as the injection position of the resin, and the first receiving port and the second receiving port are formed from the injection position. The value of the main pipe part flow ratio / branch pipe part flow ratio, which is the ratio of the main pipe part flow ratio to the mouth and the branch pipe part flow ratio from the injection position to the third receiving port, is 0.9 to 1 In the range of .1 and
The main pipe portion axial direction dimension from the injection position to the third receiving port is longer than the main pipe portion axial direction size from the injection position to the first receiving port and the second receiving port, and The thickness of the branch pipe portion from the injection position to the third receiving port is formed thicker than the thickness of the main pipe portion from the injection position to the first receiving port and the second receiving port,
Pipe joint characterized in that the wall thickness of the branch pipe portion is gradually thicker toward the front Symbol injection position to said third receptacle.

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