JP2023115344A - Resin tees joint - Google Patents

Abstract

To provide a resin tees joint capable of reducing a pressure loss of fluid passing a first corner and/or a second corner without complicating a mold structure.SOLUTION: A branch part 24 of a joint main body 11 mutually connects a first straight part 21 to which an inserted first pipe 101 is connected, a second straight part 22 to which a second pipe 102 is connected, and a third straight part 23 to which a third pipe 103 is connected. A first in-core 111 to a third in-core 113 are inserted into ends of the first pipe 101 to the third pipe 103. The second branch part 24 constitutes a first corner 31 connecting the first straight part 21 and the second straight part 22 which are disposed so as to be perpendicular with each other, and a second corner 32 connecting the second straight part 22 and the third straight part 23 which are disposed so as to be perpendicular with each other. Inner portions 61 and 62 in the first and second corners 31 and 32 are formed stepwise in a flow passage direction.SELECTED DRAWING: Figure 1

Description

The present invention relates to a resin tee joint.

Non-Patent Document 1, page A5, discloses a "cheese socket (hereinafter referred to as a resin cheese joint)" used for branching water and hot water supply pipes. As shown in FIG. 6, the resin cheese joint 200 includes a T-shaped joint body 201 made of synthetic resin. The joint main body 201 includes a first straight portion 211 to a third straight portion 213 and a branch portion 214 . The branch portion 214 connects the first straight portion 211 to the third straight portion 213 to each other.

Branch portion 214 constitutes first corner 215 of the flow path of resin cheese joint 200 . The first corner 215 connects the first straight portion 211 and the second straight portion 212 that are arranged to be perpendicular to each other. Branch portion 214 constitutes a second corner 216 of the flow path of resin cheese fitting 200 . The second corner 216 connects the second straight portion 212 and the third straight portion 213 which are arranged at right angles to each other. Note that the first corner 215 and the second corner 216 share the flow path on the second straight portion 212 side.

Onda Manufacturing Co., Ltd. "General Catalog 2018-2019", pages A5, A7, A8

The first corner 215 has a right-angled shape in which a portion 217 located inside the flow path (hereinafter referred to as an inner portion 217) bends the flow of hot water at once. In addition, the second corner 216 has a right-angled shape in which a portion 218 positioned inside the channel (hereinafter referred to as an inner portion 218) bends the flow of hot water at once. Therefore, when hot water flows between the first straight portion 211 and the second straight portion 212 or between the second straight portion 212 and the third straight portion 213, the direction of hot water in the inner portions 217 and 218 is abrupt. There was a problem of generating a large pressure loss due to conversion.

FIG. 5B shows the results of CAE (Computer Aided Engineering) analysis assuming that hot water flows from the first straight portion 211 to the second straight portion 212 in the resin cheese joint 200 of FIG. In the analysis results, light-colored portions indicate a high flow rate of hot water, and dark-colored portions indicate a low flow rate of hot water. Therefore, in the analysis results, a large change from light color to dark color in the direction of the flow path in the inner portion 217 (see FIG. 6) indicates that a large pressure loss has occurred. Note that the CAE analysis is based on the assumption that the third straight portion 213 is in a sealed state.

In order to solve such a problem, the inner part 217 of the first corner 215 and the second corner are formed in the same manner as the "smooth elbow" corner described on pages A7 and A8 of Non-Patent Document 1, for example. It is conceivable that the inner portion 218 of 216 is formed with a smooth curve in the direction of the flow path. However, as a matter of course, the tee joint has more corners than the elbow joint and the shape of the flow path is complicated. It was difficult to injection mold the inner portion 218 of the corner 216 as smooth as a "smooth elbow" corner.

SUMMARY OF THE INVENTION An object of the present invention is to provide a resin cheese joint capable of reducing the pressure loss of fluid passing through the first corner and/or the second corner without complicating the mold structure.

In order to achieve the above object, the invention of claim 1 has a first straight portion to which a first pipe having a first inner core inserted at its end is connected, and a second pipe having a second inner core inserted at its end. Integral with the first straight portion to the third straight portion so as to connect the second straight portion to be connected and the third straight portion to which the third pipe having the third inner core inserted at the end is connected to each other A joint body made of resin having a branched portion is provided, and the branched portion constitutes a first corner connecting the first straight portion and the second straight portion arranged to be perpendicular to each other. and a second corner that connects the second straight portion and the third straight portion that are arranged to be perpendicular to each other, and at the first corner and/or the second corner, inside the flow path The position portion is formed in a stepped shape along the direction of the flow path, and the first corner corner portion and/or the second corner corner portion forming the stepped shape are selected from the first to third incores. is a resin tee joint formed by exposing one of the corresponding tip surfaces of the branched portion to the inner space of the branched portion.

According to the above configuration, at the first corner and/or the second corner, the flow of the fluid in the portion located inside the flow path can be bent in a plurality of steps, and the direction of the fluid is not changed all at once but gradually. can reduce the pressure loss of the fluid passing through the first corner and/or the second corner.

Thus, by forming the portion of the first corner and/or the second corner in a stepped shape along the flow path direction, each component for forming the stepped shape is replaced with the corresponding first straight portion. It becomes easy to form a shape along the axial direction of the third straight portion, in other words, a shape along the releasing direction of the joint body during injection molding. In this way, compared to the injection molding of a smoothly curved shape such as the corner of the "smooth elbow" described in the "prior art" section, the divided structure of the mold is not complicated. , the mold structure of the joint body can be simplified.

FIG. 2 is a vertical cross-sectional view of a resin tee joint; The side view of a joint main body. FIG. 3 is a cross-sectional view taken along the line AA of FIG. 2; FIG. 3 is a cross-sectional view along the line BB of FIG. 2; (a) is a diagram showing the results of CAE analysis on a resin tee joint of one embodiment, and (b) is a diagram showing the results of CAE analysis on a conventional resin tee joint. FIG. 2 is a vertical cross-sectional view of a conventional resin-made cheese joint.

An embodiment of the resin tee joint of the present invention will be described below.
As shown in FIG. 1, the resin cheese joint 1 connects a first pipe 101 on the upstream side of the hot water supply pipe and a second pipe 102 and a third pipe 103 on the downstream side in a T shape. is a branch joint. The first to third pipes 101 to 103 are made of synthetic resin such as polybutene or crosslinked polyethylene.

As shown in FIGS. 1 and 2, the resin cheese joint 1 includes a T-shaped joint body 11 made of resin. The joint main body 11 includes a first straight portion 21 to a third straight portion 23 and a branch portion 24 . The branch portion 24 is integrally formed with the first straight portion 21 to the third straight portion 23 so as to connect the first straight portion 21 to the third straight portion 23 with each other. As the resin forming the joint main body 11, for example, a mixture of polyphenylene sulfide resin and glass fiber can be used.

As shown in FIG. 1 , in the joint main body 11 , the first straight portion 21 and the second straight portion 22 are formed in a cylindrical shape linearly extending in directions perpendicular to each other. The branch portion 24 constitutes a first corner 31 of the flow path of the resin cheese joint 1 . The first corner 31 is bent at right angles so as to connect the first straight portion 21 and the second straight portion 22 . A first corner corner portion 71 is formed in a portion of the branch portion 24 located inside the curved portion in the flow path direction.

In the joint main body 11 , the third straight portion 23 is formed in a cylindrical shape that is positioned on the same axis as the first straight portion 21 and that extends linearly in a direction perpendicular to the second straight portion 22 . The branch portion 24 constitutes a second corner 32 of the flow path of the resin cheese joint 1 . The second corner 32 is bent at right angles so as to connect the second straight portion 22 and the third straight portion 23 . A second corner portion 72 is formed in a portion of the branch portion 24 located inside the curved portion in the flow path direction. In addition, the first corner 31 and the second corner 32 share the flow path on the second straight portion 22 side.

The first straight portion 21 is provided with a first locking mechanism 41 that prevents the first pipe 101 connected to the first straight portion 21 from coming off. The second straight portion 22 is provided with a second lock mechanism 42 that prevents the second pipe 102 connected to the second straight portion 22 from coming off. The third straight portion 23 is provided with a third lock mechanism 43 that prevents the third pipe 103 connected to the third straight portion 23 from coming off.

A first communication port 24 a is provided in the branch portion 24 at a boundary portion with the first straight portion 21 . A second communication port 24b is provided at the boundary portion of the branch portion 24 with the second straight portion 22 . A third communication port 24 c is provided in the branch portion 24 at a boundary portion with the third straight portion 23 .

On the inner peripheral surfaces of the first to third straight portions 21 to 23, accommodating portions 25 for accommodating the ends of the corresponding first to third pipes 101 to 103 are provided at portions near the branch portion 24. It is A step 26 is formed between the inner peripheral surface of each accommodation portion 25 and the inner peripheral surfaces of the corresponding first to third communication ports 24a to 24c in the branch portion 24. As shown in FIG. Each step 26 is substantially orthogonal to the inner peripheral surfaces of the corresponding first to third communication ports 24a to 24c.

Cylindrical first to third inner cores 111 to 113 made of metal are inserted into the ends of the first to third pipes 101 to 103, respectively. The first to third inner cores 111 to 113 are inserted into the corresponding first to third pipes 101 to 103 by flanges 111a to 113a formed at the ends of the first to third inner cores 111 to 113. are regulated. The first to third pipes 101 to 103 extend to the positions where the tip surfaces of the corresponding first to third inner cores 111 to 113 abut against the steps 26, respectively. 25 is inserted.

On the inner peripheral surfaces of the first straight portion 21 to the third straight portion 23, there is a gap from the accommodation portion 25 between each accommodation portion 25 and the tip end portion of the corresponding first straight portion 21 to the third straight portion 23. A seal portion 28 having a larger inner diameter is provided. Inside each seal portion 28, a seal ring 51, a spacer 52, a seal ring 53, and a retaining ring 54 are arranged from the accommodation portion 25 side toward the tip end side of the corresponding first straight portion 21 to third straight portion 23. are arranged in order.

When the end portions of the first to third pipes 101 to 103 are inserted into the accommodating portions 25 of the corresponding first to third straight portions 21 to 23, the first to third pipes 101 to 103 are inserted into the seal ring 51. , spacer 52 , sealing ring 53 and retaining ring 54 . At this time, the seal rings 51 and 53 of each seal portion 28 are in contact with the outer peripheral surfaces of the corresponding first to third pipes 101 to 103, and the hot water flowing through the joint main body 11 flows through the first to third pipes. Leakage to the outside of the resin cheese joint 1 from between the outer peripheral surface of 103 and the inner peripheral surface of the seal portion 28 is suppressed.

The first to third locking mechanisms 41 to 43 include holding members 44 for holding the corresponding first to third pipes 101 to 103 in the corresponding first to third straight portions 21 to 23; and a cap 45 for attaching the member 44 to the corresponding first to third straight portions 21 to 23 . The holding member 44 is provided with an annular lock ring 48 located between the fitting ring 46 and the split ring 47 . Each retaining member 44 is positioned adjacent a retaining ring 54 located on the corresponding seal portion 28 .

The cap 45 is cylindrically formed. By arranging the split ring 47 and the lock ring 48 inside the cap 45 and fitting the fitting ring 46 inside the cap 45 , the split ring 47 and the lock ring 48 do not come off from the cap 45 . In this state, the opening end of the cap 45 is engaged with the end portions of the corresponding first straight portion 21 to the third straight portion 23 at the portions that radially overlap with the end portions of the corresponding first straight portion 21 to the third straight portion . The first locking mechanism 41 to the third locking mechanism 43 each including the holding member 44 and the cap 45 are easily assembled to the portion 21 to the third straight portion 23, respectively.

With the first locking mechanism 41 to third locking mechanism 43 (holding member 44 and cap 45) attached to the corresponding first straight portion 21 to third straight portion 23, the first pipe 101 to third pipe 103 passes through the corresponding holding member 44 and the cap 45 and is inserted into the receiving portion 25 from the corresponding distal ends of the first straight portion 21 to the third straight portion 23, the lock ring of the holding member 44 is opened. 48 press the outer peripheral surfaces of the corresponding first to third pipes 101 to 103 . This prevents the first to third pipes 101 to 103 from slipping out of the corresponding first to third straight portions 21 to 23 .

Next, the first corner 31 and the second corner 32 are described in detail.
As shown in FIGS. 1 and 4, in a portion 61 (hereinafter referred to as an inner portion 61) located inside the channel of the first corner 31, the second communication port 24b of the branch portion 24 is connected to the corresponding second It is positioned on the same axis as the inner core 112 and is formed into a partial cylinder having a diameter larger than the inner diameter of the second inner core 112 . Therefore, in the inner portion 61 , the inner peripheral side of the tip surface of the second inner core 112 is exposed to the inner space of the branch portion 24 , and the exposed portion forms the first corner portion 73 .

In the portion 62 located inside the flow path of the second corner 32 (hereinafter referred to as the inner portion 62), the second communication port 24b of the branch portion 24 is located on the same axis as the corresponding second in-core 112. Moreover, it is formed into a partial cylinder having a diameter larger than the inner diameter of the second in-core 112 . Therefore, in the inner portion 62 , the inner peripheral side of the tip surface of the second inner core 112 is exposed to the inner space of the branch portion 24 , and the exposed portion forms the second corner portion 74 .

As shown in FIGS. 1 and 3, in the portion 65 located outside the first corner 31, the first communication port 24a of the branch portion 24 is located on the same axis as the corresponding first in-core 111 and It is formed into a partial cylinder having the same diameter as the inner diameter of the 1-in-core 111 . Therefore, in the portion 65, no step in the axial direction is formed between the inner peripheral surface of the first inner core 111 and the inner peripheral surface of the first communication port 24a.

However, in the inner portion 61 of the first corner 31, the first communication port 24a of the branch portion 24 is configured so that the corresponding region of the inner space of the first inner core 111 projected in the axial direction protrudes radially outward. In addition, it has a partially cylindrical meat stealing. Therefore, in the inner portion 61 , the inner peripheral side of the tip surface of the first inner core 111 is exposed to the inner space of the branch portion 24 , and the exposed portion forms the first corner portion 75 .

Thus, the inner portion 61 of the first corner 31 forms a stepped shape along the flow path direction of the first corner 31 by the plurality of first corner corners 71 , 73 , and 75 . Therefore, when hot water flows between the first straight portion 21 and the second straight portion 22, the flow of hot water in the inner portion 61 is bent in a plurality of stages by the plurality of first corner portions 71, 73, 75. be able to. As a result, the direction of the hot water at the inner portion 61 is not changed all at once, but rather gradually, so that the pressure loss of the hot water passing through the first corner 31 can be reduced.

FIG. 5(a) is the result of CAE analysis under the same conditions as in FIG. 5(b), assuming that hot water flows from the first straight portion 21 to the second straight portion 22 in the resin cheese joint 1 of FIG. be. In the analysis results, no large change from light color to dark color in the direction of the flow path in the inner portion 61 (see FIG. 1), that is, no large pressure loss is observed. In the resin tee joint 1 of FIG. 1, even if it is assumed that hot water flows from the second straight portion 22 to the first straight portion 21, the same CAE analysis result as in FIG. 5A can be obtained. , is not difficult to imagine.

As shown in FIGS. 1 and 3, at the portion 66 located outside the second corner 32, the third communication port 24c of the branch portion 24 is located on the same axis as the corresponding third in-core 113 and is located on the same axis as the third in-core 113. It is formed into a partial cylinder having the same diameter as the inner diameter of the 3-inch core 113 . Therefore, in the portion 66, no step in the axial direction is formed between the inner peripheral surface of the third inner core 113 and the inner peripheral surface of the third communication port 24c.

However, in the inner portion 62 of the second corner 32, the area projected in the axial direction of the inner space of the corresponding third inner core 113 is projected radially outward from the third communication port 24c of the branch portion 24. In addition, it has a partially cylindrical meat stealing. Therefore, in the inner portion 62 , the inner peripheral side of the tip surface of the third inner core 113 is exposed to the inner space of the branch portion 24 , and the exposed portion forms the second corner portion 76 .

Thus, the inner portion 62 of the second corner 32 forms a stepped shape along the flow direction of the second corner 32 by the plurality of second corner corners 72 , 74 , 76 . Therefore, when hot water flows between the second straight portion 22 and the third straight portion 23, the flow of hot water in the inner portion 62 is bent in a plurality of steps by the plurality of second corner portions 72, 74, and 76. be able to. As a result, the direction of the hot water at the inner portion 62 is not changed all at once, but rather gradually, so that the pressure loss of the hot water passing through the second corner 32 can be reduced.

In the resin cheese joint 1 of FIG. 1, it is assumed that hot water flows from the second straight portion 22 to the third straight portion 23, or that hot water flows from the third straight portion 23 to the second straight portion 22. It is not difficult to imagine that the same CAE analysis results as those in FIG.

Here, in the resin cheese joint 1 of FIG. 1, the case where the nominal diameter of the corresponding first pipe 101 to third pipe 103 is "13A", that is, corresponds to the first straight portion 21 to third straight portion 23 The equivalent pipe length of the resin cheese joint 1 was measured when the dimension setting of each component was set to correspond to "13A".

According to the results of the measurement, when hot water flows between the first straight portion 21 and the second straight portion 22, and when hot water flows between the second straight portion 22 and the third straight portion 23, , the equivalent tube length was 1.1 m to 1.2 m. This result indicates that the equivalent pipe length is reduced by about 20% compared to the conventional resin cheese joint 200 (see FIG. 6) under the same conditions.

Also, in the resin cheese joint 1 of FIG. The equivalent pipe length of the resin cheese joint 1 was measured when the dimensions of each component were set to correspond to "16A".

According to the results of the measurement, when hot water flows between the first straight portion 21 and the second straight portion 22, and when hot water flows between the second straight portion 22 and the third straight portion 23, , the equivalent pipe length was 1.9 m to 2.0 m. This result indicates that the equivalent pipe length is reduced by about 20% compared to the conventional resin cheese joint 200 (see FIG. 6) under the same conditions.

Furthermore, in the resin cheese joint 1 of FIG. Regarding the case where the dimension setting of each component corresponding to the first straight portion 21 and the third straight portion 23 is set to "16A", and the dimension setting of each component corresponding to the second straight portion 22 is set to "13A" , the equivalent pipe length of the resin cheese joint 1 was measured.

According to the results of the measurement, when hot water flows from the first straight portion 21 to the second straight portion 22 or when hot water flows from the third straight portion 23 to the second straight portion 22, the equivalent pipe length is Equivalent to the second pipe 102 on the side, that is, equivalent to a pipe with a nominal diameter of "13A", was 1.0 m to 1.1 m. This result indicates that the equivalent pipe length is reduced by about 20% compared to the conventional resin cheese joint 200 (see FIG. 6) under the same conditions.

The following effects can be obtained in this embodiment.
(1) By forming the inner portions 61 and 62 of the first corner 31 and the second corner 32 in a stepped shape along the direction of the flow path, each component for forming the stepped shape is replaced with a corresponding first corner. The shape along the axial direction of the first straight portion 21 to the third straight portion 23, in other words, the shape along the release direction of the joint body 11 during injection molding can be easily obtained. In this way, compared to the injection molding of a smoothly curved shape such as the corner of the "smooth elbow" described in the "prior art" section, the divided structure of the mold is not complicated. , the mold structure of the joint body 11 can be simplified.

(2) The first corner portions 73 and 75 and the second corner portions 74 and 76 are formed by utilizing the exposed end faces of the first to third inner cores 111 to 113 . Therefore, the inner surface shape of the branch portion 24 can be simplified by only forming the first corner corner portion 71 and the second corner corner portion 72, and the mold structure of the joint main body 11 can be further simplified.

(3) At the inner portion 61 of the first corner 31, only the inner peripheral side of the tip surface of the first inner core 111 is exposed to the inner space of the branch portion 24, and the outer peripheral side of the tip surface is It abuts on the stepped portion 26 and is not exposed to the inner space. That is, even with the formation of the first corner corner portion 75, the contact between the first inner core 111 and the step 26 can be maintained without interruption in the circumferential direction in the annular region, and the water impermeability in the entire contact region can be improved. can be maintained well. Therefore, for example, hot water flowing through the branch portion 24 does not go directly to the seal ring 51 corresponding to the first straight portion 21 , thereby preventing deterioration of the watertightness of the resin cheese joint 1 .

This is formed by using the exposure of the tip end surface of the second in-core 112, the corner portion 73 for the first corner and the corner portion 74 for the second corner, and the exposure of the tip end surface of the third in-core 113. The same is true for the corner portion 76 for the second corner to be formed, and similarly hot water directly flows into the seal ring 51 corresponding to the second straight portion 22 and the seal ring 51 corresponding to the third straight portion 23. You can prevent going.

<Extra example>
For example, the present invention can also be implemented in the following aspects.
o For only one of the first corner 31 and the second corner 32, the corresponding inner portions 61, 62 are formed stepwise along the direction of the flow path.

○ The first corner corners 73 and 75 and the second corner corners 74 and 76 are removed, and the first corner corner 71 and the second corner corner 72 are arranged in steps along the flow path direction. to form a shape (multiple corners).

○ In the above-described embodiment, the flow of hot water in the inner portion 61 of the first corner 31 was configured to be bent in three stages (three first corner corners 71, 73, 75), but this has been changed. , 2 stages, 4 stages, 5 stages, 6 stages, etc., in a plurality of stages other than 3 stages, to bend the flow of hot water.

○ In the above embodiment, the flow of hot water in the inner portion 62 of the second corner 32 was configured to be bent in three stages (three second corner corners 72, 74, 76), but this has been changed. , 2 stages, 4 stages, 5 stages, 6 stages, etc., in a plurality of stages other than 3 stages, to bend the flow of hot water.

o Implement the present invention in a resin tee joint having a configuration branching in three or more directions.

Next, technical ideas that can be grasped from the above embodiment will be described.
(a) A first straight portion to which a first pipe made of polybutene or crosslinked polyethylene having a first incore inserted at its end is connected, and a polybutene or crosslinked polyethylene having a second incore inserted at its end 2 pipes are connected to each other, and the third straight portion to which a third pipe made of polybutene or crosslinked polyethylene having a third incore inserted at the end is connected to each other. A joint body made of resin having a branch portion integrally formed with the straight portion to the third straight portion,
The branched portion constitutes a first corner connecting the first straight portion and the second straight portion which are arranged at right angles to each other, and the second straight portion which is arranged at right angles to each other. forming a second corner connecting with the third straight portion,
At the first corner and/or the second corner, a portion located inside the flow channel is formed in a stepped shape along the direction of the flow channel,
The first corner corner portion and/or the second corner corner portion forming the stepped shape is such that any one of the corresponding tip surfaces of the first to third inner cores is placed in the inner space of the branch portion. Resin tee joint formed by exposing against

DESCRIPTION OF SYMBOLS 1... Resin cheese joint, 11... Joint main body, 21... 1st straight part, 22... 2nd straight part, 23... 3rd straight part, 24... Branch part, 31... First corner, 32... Second corner, 61... Inside part 62... Inside part 71... First corner corner 72... Second corner corner 73... First corner corner 74... Second corner corner 75... First corner corner portion 76...second corner portion, 101...first pipe, 102...second pipe, 103...third pipe.

Claims (1)

A first straight portion to which a first pipe having a first in-core inserted at its end is connected, a second straight portion to which a second pipe having a second in-core inserted at its end is connected, and a third in-core at its end A joint body made of resin having a branch portion integrally formed with the first straight portion to the third straight portion so as to mutually connect the third straight portion to which the third pipe into which the is inserted is connected prepared,
The branched portion constitutes a first corner connecting the first straight portion and the second straight portion which are arranged at right angles to each other, and the second straight portion which is arranged at right angles to each other. forming a second corner connecting with the third straight portion,
At the first corner and/or the second corner, a portion located inside the flow channel is formed in a stepped shape along the direction of the flow channel,
The first corner corner portion and/or the second corner corner portion forming the stepped shape have the tip surface of any corresponding one of the first to third inner cores in the inner space of the branch portion. Resin tee joint formed by exposing against

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