JP2020112233A - T-shaped pipe joint - Google Patents

Abstract

To prevent extreme reduction in flow rate in a branch flow passage part where a flow passage branches into a T-shape, as compared to a main flow passage part.SOLUTION: A joint body 1 includes a guiding protrusion part Y formed in a main flow passage part M to deflect and guide part of fluid passing through the main flow passage part M to a branch flow passage part S.SELECTED DRAWING: Figure 6

Description

The present invention relates to a T-type pipe joint also called a three-way joint or cheese.

Conventionally, as a T-type pipe joint made of synthetic resin, one shown in FIG. 22 is known (see Patent Document 1).
In the joint main body 75 of the conventional T-type pipe joint, as shown in FIG. 22, a main flow path portion 78 having a fluid inlet 76 and a fluid outlet 77 on the opposite side of 180° is straight (straight). Moreover, the sub-flow passage portion 79 is branched at a right angle from the main flow passage portion 78, and the T-shaped flow passage 80 is formed by the main flow passage portion 78 and the sub flow passage portion 79 (for diverting). ..

Design Registration No. 1091181

In FIG. 23(A), an example of connecting piping of a conventional T-type pipe joint 85 having a joint body 75 (as shown in FIG. 22) is shown. In FIG. 23(A), three T-type pipe joints 85 are sequentially connected by main pipes P ₁₀ , P ₁₁ , P ₁₂ , and P ₁₃ to form a main flow path 81. The case where the branch pipes P ₃₀ , P ₃₁ , P ₃₂ are connected to each of the 85 to form the branch flow paths 82, 82, 82 is shown in a simplified diagram.

When such a conventional joint body 75 is used, there are the following problems.
That is, the arrow F ₈₁ in FIG. 22 and FIG. 23 shows the flow rate of the fluid flowing through the main flow passage 81, although the arrow F ₈₂ indicates the flow rate of the fluid flowing through the branch passage 82, the flow rate F ₈₂ of the branch side, The problem is that the flow rate F ₈₁ on the main side is extremely small. Depending on the disposition direction, disposition height, etc. of the branch pipes P ₃₀ , P ₃₁ , and P ₃₂ , there may be a problem that the flow rate F ₈₂ on the branch side becomes zero, or even the backflow occurs.
The reason for this is that, as shown by arrow F ₈₁ in FIG. 22, when a fluid flows in the main flow passage portion 78 at a high speed in a straight line direction, the sub flow passage portion (crossed at a right angle) is defined by Bernoulli's theorem. It is presumed that this is because the inside of 79 is depressurized or becomes negative pressure.

As described above, the branch flow path 82 side of the flow F ₈₂ is reduced extremely serious such branch pipe P _30, P _31, previously connected to the faucet and water heater etc. P ₃₂ becomes difficult to use problem There was a risk of causing.

Therefore, the present invention includes a joint body made of synthetic resin, and the joint body has a main flow passage portion into which a fluid flows in and out from the opposite side of 180°, and a side stream branched from the main flow passage portion in an orthogonal direction. In a T-shaped pipe joint having a T-shaped flow path including a flow path portion, a guide protrusion for deflecting a part of the fluid passing through the main flow path portion to the sub flow path portion is provided. It is formed on the inner surface on the side opposite to the branch in the main flow path portion.

Also, a pair of virtual elbow bodies having a circular cross section are arranged symmetrically in a back-to-back position with their one end faces facing in the opposite direction by 180°, and they are brought close to each other so that the other end faces thereof are aligned. The inner surface shape of the branching central region of the T-shaped flow path is set to the combined virtual shape, and the one end surface is the main flow path side and the other end surface is the sub-stream. On the road portion side, the guide protruding ridge portion is configured so as to have a convex shape corresponding to the back side curved V-shaped valley in the virtual united shape.

The fluid also flows into the sub-flow passage portion of the T-type pipe fitting at a sufficient flow rate. In the connection pipe using this T-type pipe joint, the fluid flows evenly in the branch flow passage (branch pipe) evenly.

It is a longitudinal section showing a 1st embodiment of the present invention. It is a perspective view for explaining the inner surface shape of the T-shaped flow path, (A) is a perspective view for explaining a pair of virtual elbow bodies are approached in a back-to-back posture, and (B) is a virtual united shape. It is a perspective view. It is a perspective view of the pipe joint main body of 1st Embodiment. It is a front view. It is a side view. It is a longitudinal cross-sectional view of a pipe joint body. It is a perspective view showing a 2nd embodiment. It is a side view. It is a front view. FIG. It is a bottom view. It is a sectional view showing an embodiment of a manufacturing device of a T type pipe joint concerning the present invention, and showing a state before inserting a core pin into a cavity of a metallic mold. It is sectional drawing which shows the state just after inserting a core pin into the cavity of a metal mold and injecting resin. FIG. 6 is a cross-sectional view showing a state in which the resin molded after a predetermined time has elapsed from the injection molding is being drawn out after the arc-shaped core pin is moved outward along the arc-shaped axis after cooling. It is sectional drawing which shows the state just before taking out the injection-molded pipe joint main body in the state which the core pin was pulled out. It is a figure which shows the specific example of a core pin, (A) is a perspective view from a tip top direction, (B) is a side view from a tip direction, (C) is a perspective view from a tip bottom direction, (D) is It is a perspective view from a base end lower direction. It is a figure showing an operation block, (A) is a front view and (B) is a side view. It is a figure which shows a guide cylinder, (A) is a front view, (B) is a side view. It is a figure showing the 2nd core pin, (A) is a front view and (B) is a partial section side view. The operation pin is shown, (A) is a side view, (B) is a front view, and (C) is a CC cross-sectional enlarged view of (A). It is a figure for explanation of the counter branch side inner surface X in which a guide ridge part is to be arranged, (A) is a front sectional view, (B) is a side view, and (C) is a perspective explanatory view. It is a longitudinal cross-sectional view showing a conventional example. It is a piping connection diagram for comparing and explaining the operation and effect of a prior art example and this invention, (A) is a piping connection diagram of a prior art example, (B) is a piping connection diagram of this invention.

Hereinafter, the present invention will be described in detail based on the illustrated embodiments.
As shown in FIGS. 1 to 6, a T-type pipe joint 40 according to the present invention includes a synthetic resin joint body 1, and the joint body 1 has a main flow in which a fluid flows in and out from 180° opposite sides. A T-shaped flow path 10 including a flow path M and a sub flow path S branching from the main flow path M in an orthogonal direction is provided.
Then, as shown in FIGS. 1, 6 and 5, the guide protrusion ridge Y for deflecting and guiding a part of the fluid passing through the main flow passage portion M to the sub flow passage portion S is provided. Formed on the inner surface of. That is, the guide protrusions Y are formed on the inner surface X of the main flow path M on the side opposite to the branch (see FIG. 21).

Here, the “counter-branch side inner surface X” and the “formation on the counter-branch side inner surface X” will be specifically described below.
FIG. 21 is a diagram in which the smooth main flow path portion 78 and the sub flow path portion 79 orthogonal to the smooth main flow path portion 78 shown in FIG. In FIG. 21, it has an axial direction dimension W ₀ corresponding to the diameter Ds of the sub flow passage portion 79, is an inner surface 180° opposite to the sub flow passage portion 79, and has a central angle θ of 180°. The area is referred to as the anti-branch inner surface X. Therefore, in the embodiments of FIGS. 1 and 6, the inner diameter dimension of the smallest inner diameter portion 2 of the sub-flow passage portion S is set to the diameter Ds (of FIG. 21) and the guide protrusion Y does not exist ( When the inner surface of the hole (indicated by the chain double-dashed line 3 in FIG. 6) is determined as the inner surface of the main flow path portion 78 of FIG. 21, the inner surface X on the anti-branch side becomes clear.

Next, "the guide ridge Y is formed on the inner surface X on the side opposite to the branch"
(A) In the case where all the guiding protrusions Y are formed only on the inner surface X on the side opposite to the branch.
(B) In the case where the largest protruding portion of the guide protrusion ridge Y exists on the inner surface X on the anti-branch side, but a part thereof exists beyond the inner surface X on the anti-branch side.
It is defined as including any of the above (a) and (b).

The latter embodiment (b) is applicable to the embodiments shown in FIGS. 5 and 6 and the embodiments shown in FIGS. 8 and 10 (described later). In other words, in FIGS. 5 and 8, the guide protrusion ridges Y are arranged in a stretched shape up to a central angle range larger than θ=180° shown in FIG. 21 illustrates a case where the guide protrusion ridge Y is arranged in a stretched shape in the axial direction with respect to W ₀ shown in FIG.

Next, FIG. 1 (one embodiment is shown), FIG. 3 to FIG. 6, and FIG. 7 to FIG. 11 of still another embodiment, the branching central region 10P of the T-shaped flow path 10 and the guide protrusion. The three-dimensional shape of the ridge Y will be described below.
First, the branching central region 10P will be described with reference to FIGS. In the T-shaped flow path 10 of the joint body 1, pipes P, 5 and 5 of slightly larger diameter are formed to insert the pipe P, and a sealing function such as a sealing material 9 is added, or A pipe withdrawal prevention function is added (not shown).

A cap nut 7 is screwed onto the outer periphery of the insertion tube portion 5 via a male screw 6, and a retaining ring 8 having a biting claw on the inner peripheral edge is attached as a pipe withdrawal preventing function.
The branching central region 10P is a region that does not have such a pipe drawing function or a sealing function and plays a central role for purely branching a fluid.

In FIG. 1, the ends 20 in the three directions of the branching central region 10P are formed with a stepped portion, and the tip end of the pipe P comes close to or abuts the end portion 20 composed of the stepped portion. Alternatively, the mark/guide ring 14 as shown in FIG. In addition, as shown in FIG. 1, the reinforcing metal cylinder 16 may approach or abut the end 20.

FIG. 2 is a virtual diagram for explaining the three-dimensional shapes of the branching central region 10P and the guide protrusion ridge Y described above.
That is, a pair of virtual elbow bodies 11, 11 having a circular cross section is assumed. The pair of virtual elbow body 11
, 11 are made to approach each other so that the axes L ₁₁ and L ₁₁ are included in the same plane and in a back-to-back posture as indicated by arrows E and E. In this back-to-back posture, the one end faces 12, 12 of the pair of virtual elbow bodies 11, 11 face in opposite directions by 180°, and pass through the center points of the one end faces 12, 12 to extend the straight line of the axis L ₁₁ . L ₁₁₀ matches (that is, forms one straight line as shown in FIG. 2A).

Then, the pair of virtual elbow bodies 11, 11 are arranged in plane symmetry. In short, as shown in FIG. 2(A), a pair of virtual elbow bodies 11, 11 having a circular cross section are made to approach each other in a back-to-back posture as shown by arrows E, E, and as shown in FIG. 2(B). , A virtual united shape 15 in which the other end surfaces 13 and 13 are united so that the one end surfaces 12 and 12 face 180° in opposite directions is assumed.

In each of the embodiments shown in FIGS. 1, 3 to 6 and FIGS. 7 to 11, the inner surface shape of the central region 10P of the T-shaped channel 10 of the joint body 1 is the above-mentioned virtual united shape. Match.
More specifically, the one end faces 12 and 12 of the virtual united shape 15 (see FIG. 2B) are connected to the main flow path portion of the branching central region 10P shown in FIGS. M (end 20).

In addition, the other end surface 13 of the virtual united shape 15 (see FIG. 2B) is the side of the sub-flow path portion S.
In FIG. 2, the virtual elbow body 11 is formed at an angle slightly smaller than the 90° elbow--for example, 60° or more and less than 90°--by a core pin (described later). May be easier, and such slightly smaller angles are also free.

Then, by setting the inner surface shape of the branching central region 10P to the virtual united shape 15 as described with reference to FIGS. It is formed in a convex shape corresponding to the V-shaped valley 18 of the side curve.

Further, in FIG. 2(B), the (ii) cross section and the (roll) cross section are substantially circular, and therefore, the cross sectional shape of the central region 10P in FIGS. 6 and 10 is also substantially circular. The flow resistance Fs flowing from the main flow passage M to the sub flow passage S is reduced, and the flow resistance Fs flowing to the sub flow passage S more smoothly in cooperation with the guide protrusions Y becomes circular. It is sufficiently large (see FIG. 23(B)).

The cross-sectional shape of the flow path hole in the central region 10P is substantially circular as described above, but if explained in more detail, it corresponds to the one end face 12 and the other end face 13 shown in FIG. 2B ( The cross-sectional shape of the end portion 20 (shown in FIGS. 6 and 10) is circular, and in the central portion (in FIGS. 6 and 10) of the central region 10P, the circular shape and the circular shape partially overlap each other, It has a slightly large cross-sectional area.

Next, the joint body 1 of the T-type pipe joint 40 shown in FIG. 1 will be described in detail with reference to FIGS. 3 to 6, in which the reinforcement provided in a straight shape is provided on the side opposite to the side of the sub-channel portion S. The ribs 21 and the reinforcing ribs 22 attached to the front and rear side surfaces in a T shape are provided on the outer surface in a protruding shape.
Further, this joint body 1 has an inner and outer double structure made of a transparent resin (in FIGS. 1 and 6). The cap nut 7 is made of opaque resin.

Reference numeral 23 is a small locking projection that functions to prevent the cap nut from rotating in the tightened state, and is integrally formed by injection molding of the thermoplastic resin of the joint body 1. On the inner peripheral surface of the inner end portion of the cap nut 7, a large number of teeth of an isosceles triangle are provided. The structure is such that the above-mentioned tooth clicks over the small locking projection 23 tightly and maintains the final tightened state at the end.

In other embodiments shown in FIGS. 7 to 11, the reinforcing ribs 21 and 22 shown in FIGS. 3 to 6 are omitted.
Therefore, the central portion has an outer surface 25 that is thicker than the inner surface shape (that is, the virtual three-dimensional shape of FIG. 2B) of the central region 10P of the T-shaped channel 10 inside.

The male screw 6 shown in FIGS. 3 to 6 is omitted in the pipe insertion tubular portion 5 shown in FIGS. 7 to 11. A cylindrical ring (not shown) corresponding to the cap nut 7 has an inner peripheral surface on the inner end side, which is a smooth circumferential surface, is externally fitted to the pipe insertion tubular portion 5, and is fixed and integrated with an adhesive or the like.
Further, in the bottom view of FIG. 11, the ridgeline of the guide protrusion ridge Y can be seen in a vertical line.

Next, the manufacturing method and the manufacturing apparatus for the joint body 1 described above will be described below.
12 to 15 show an embodiment of a method and a manufacturing apparatus for manufacturing the joint body 1 by injection molding of a thermoplastic resin. Reference numeral 31 denotes a mold for molding the T-type (cheese-type) joint body 1, which is composed of a pair of nests 32, 32 which can be united and separated in a plane parallel to the plane of the drawing. The mold 31 has a curved (substantially T-shaped) cavity 33 corresponding to the outer surface shape of the joint body 1 to be injection-molded by combining a pair of inserts 32, 32.

The cavity 33 includes a joint outer surface central forming portion 33A (shown with dots) for molding the joint main body outer surface central portion corresponding to the branching central region 10P (see FIG. 6), and three-way from the central forming portion 33A. A pipe insertion tube portion forming portion 33B (for forming the pipe insertion tube portions 5, 5, 5 in FIG. 6). And, it has opening ends 33M, 33S, 33M opening from the die 31 in three directions forming 90°. The open ends 33M, 33M are arranged on the opposite sides of 180° and correspond to the positions of the open ends of the main flow path portion M of the joint body 1 shown in FIG. The opening end 33M corresponds to the position of the opening end of the sub-flow path portion S in FIG. Numerals 35 and 35 are a pair of operation pins that can reciprocate linearly and reciprocally with respect to the open ends 33M and 33M of the cavity 33. That is, a pair of operating pins 35, 35 are arranged on the same axis Lm so as to approach and separate from the opposite directions, and as shown in FIGS. 12 to 13, the opening end 33M of the mold 31 is opened. , 33M while linearly operating and approaching, the tip end portion 35A enters, and pulls out (retracts) from FIG. 13 through FIG. 14 to FIG. 15 to separate from the open end 33M.

As shown in FIG. 20, the operating pin 35 has a pair of transverse cross sections formed by a basic columnar portion 35B, a square plate-shaped base portion 35C, and a groove 35E formed in a cutout shape from the front end surface 35D. The mold projections 35F, 35F are integrally provided. Moreover, as shown in the side view of FIG. 20(A), the projecting portions 35F, 35F of the tip end portion 35A have cam holes (cam grooves) forming a predetermined inclination angle θ ₃₅ with respect to the pin axis 35G. 35H is provided (see FIG. 20(C)).

An arcuate core pin 51 having a circular cross section is attached to the tip end portion 35A of the operation pin 35.
Specifically, as shown in FIG. 16, the core pin 51 has a projecting piece portion 42 continuously provided at the base end thereof. Further, the projecting piece portion 42 is provided with a through hole 43.

As shown in FIGS. 12 to 15, a movable cam shaft 44, which is fitted in the cam hole 35H formed in the tip end portion 35A of the actuating pin 35, has a movable cam shaft 44 continuously provided on the arc-shaped core pin 51. It is fixedly inserted (press-fitted) into the through hole 43 of the portion 42.
That is, the movement of the arc-shaped core pin 51 on the base end side is restricted by the cam hole 35H and the cam shaft 44.

In FIGS. 12 to 15 and 17, reference numerals 36 and 36 denote operating blocks which linearly reciprocate as shown by arrows N ₆ and N ₇ by an actuator such as a cylinder (not shown). It has a hole 36A to be fixed. In addition, a concavity 36B is formed in the actuation block 36 concentrically with the hole 36A for the actuation pin 35 on one surface that abuts the die 31, and the guide cap 37 (see FIG. 18) is formed in the recess 36B. ) Is inserted and fixed.
This guide cap 37 is provided with an inner flange portion 37B having a hole portion 37A at its tip, is linearly reciprocally movable (in the axial direction) in the guide cap 37, and the second core pin 52 is internally fitted. It is assembled.

That is, the arcuate core pin 51 described above is called a first core pin, and the core pin 52 that reciprocates linearly is called a second core pin.
The second core pin 52 has a shape as shown in FIG. 19, has a square plate piece portion 52A for non-rotation at the base end in an outer brim shape, and a hole portion into which the operating pin 35 can be inserted. 52B over almost the entire length. Further, it is a tubular body having a plurality of steps of outer peripheral surface, and as shown in FIG. 6 or 10, a step near the opening end of the main flow path part M, that is, a hole part inside the pipe insertion tube part 5, It is formed in the attached shape.

A guide plate 52D having a guiding circular hole 52C is attached to the tip of the second core pin 52.
The movement of the core pin 52 on the tip side is restricted by the guiding circular hole 52C penetrating the guide plate 52D.

That is, in the pipe joint manufacturing apparatus shown in FIGS. 12 to 20, the arcuate core pin 51 is inserted while swinging along the arcuate axis L ₃₃ of the cavity 33 shown in FIGS. 12 and 13. It is provided with an arcuate movement forcing means Z that is pulled out and pulled out.
The arcuate movement forcing means Z comprises a guide circular hole 52C of the guide plate 52D, a cam hole 35H and a cam mechanism K of the cam shaft 44 (see FIGS. 14 and 19).
In other words, it can be said that the arcuate axis L ₃₃ of the cavity 33 coincides with the curved axis L ₁₁ of the virtual united shape 15 already described in FIG.

By the way, in FIGS. 12 to 15, a third core pin 53 is added. The third core pin 53 is a linear movement pin that inserts/retracts with respect to the pipe insertion tube portion forming portion 33B corresponding to the sub-flow passage portion S while linearly reciprocating.
The third core pin 53 is a solid rod-shaped body in which the hole portion 52B and the circular hole 52C of the second core pin 52 shown in FIG. 19 are embedded, and further, a small diameter positioning protrusion 53A is provided at the tip. , Have one. The linear movement of the third core pin 53 may be performed by an actuator such as a cylinder (not shown).

Further, as shown in FIG. 16, the arc-shaped first core pin 51 has a curved pin main body 51A having a circular cross section, and the distal end of the curved pin main body 51A has a first distal end that intersects at a substantially right angle. The surface 51B and the second tip surface 51C are formed.
In the injection-molded state shown in FIG. 13, the pair of first core pins 51, 51 have their first tip surfaces 51B, 51B closely pressed. Further, the second tip surface 51C closely contacts the tip of the third core pin 53.

However, a small semicircular concave recess 51D is formed on the second tip end surface 51C of the first core pin 51, and as described above, the pair of core pins 51, 51 are pressed against the first tip end surface 51B, 51B. In this state, a small circular concave portion is formed by the pair of concave concave portions 51D, 51D, and the protrusion 53A of the third core pin 53 is fitted into the small circular concave portion as shown in FIG. Then, by this fitting, the tips of the pair of first core pins 51, 51 are reliably held (centering) at accurate positions. That is, although the circular hole 52C of the second core pin 52 and the cam shaft 44 shown in FIG. 19 position the first core pin 51 near the base end relatively stably (centering), Centering is difficult because the tip of the core pin 51 fluctuates. To solve such a problem, the tip of the third core pin 53, which ensures stable and reliable centering, while entering while linearly moving, and the tip of the pair of first core pins 51, 51 are engaged (fitted) with each other. ) It can be solved by setting the status.

From the state shown in FIG. 12, the first core pins 51, 51 and the third core pin 53 are inserted into the mold 31, and the small circular protrusions are formed with respect to the small circular concave portions formed by the semicircular concave portions 51D, 51D. If the thermoplastic resin is injection-molded in the state where the pair of first core pins 51, 51 and the single third core pin 53 as shown in FIG. With the thickness, the surrounding (surrounding) wall of the T-shaped channel 10 can be molded.

After the injection molding, as shown in FIGS. 13 to 14, if the operation blocks 36, 36 are retracted in the direction of the arrow N ₇ , the first core pins 51, 51 are pulled out while moving in an arc, and as shown in FIG. It becomes a state.
After cooling, the mold 31 is separated and opened with the drawing sheet surface as a parting line, and the joint body 1 as a molded product is taken out.

FIG. 23(B) is a pipe connection diagram in which piping is performed in the T-type pipe joint 40 using the joint body 1 according to the present invention. In FIG. 23(B), the three T-type pipe joints 40 are sequentially connected by the main pipes P ₀ , P ₁ , P ₂ , and P ₃ to form the main flow path 26, and further, the T-type pipe joints. A case where branch pipes P ₂₀ , P ₂₁ , and P ₂₂ are connected to each of the 40 to form branch channels 27, 27, 27 is shown.
In FIG. 1 and FIG. 23(B), the arrow Fm indicates the flow rate (on the main side) of the fluid flowing through the main flow path 26, and the arrow Fs indicates the flow rate (on the branch side) of the fluid flowing through the branch flow path 27. Show.

The present invention solves the problem that the flow rate Fs on the branch side is extremely smaller than the flow rate Fm on the main side by providing the guide protrusion Y as described above. That is, Fs has a sufficient value compared to Fm. In addition, there is no fear that Fs will be zero or will be negative (backflow). As described above, when the T-type pipe coupling 40 according to the present invention is used for pipe connection, the problem that the faucet or the water heater connected to the end of the branch flow passage 27 cannot be used can be solved. Showing.

INDUSTRIAL APPLICABILITY As described in detail above, the present invention is provided with the synthetic resin joint body 1, and the joint body 1 has a main flow passage portion M through which fluid flows in and out from the opposite side of 180°, and the main flow passage portion. In a T-shaped pipe joint provided with a T-shaped flow passage 10 composed of a sub flow passage portion S branched from M in the orthogonal direction, a part of the fluid passing through the main flow passage portion M is Since the guiding protrusion Y for deflecting and guiding to the flow path S is formed on the inner surface X of the main flow path M on the side opposite to the branch side, to the pipe (branch flow path 27) connected to the side of the sub flow path S. The conventional problem of not being able to obtain a sufficient fluid flow was solved with a simple shape (configuration).

In addition, a pair of virtual elbow bodies 11, 11 having a circular cross section are arranged back-to-back with their one end faces 12, 12 facing in opposite directions by 180°, and are arranged in plane symmetry to be brought close to each other. The virtual merged shape 15 is formed so that the end faces 13 and 13 are aligned with each other; the inner face shape of the branching central region 10P of the T-shaped flow path 10 is set; The other end face 13 is made to correspond to the side of the flow path portion M and the side of the sub-flow path portion S, and the guide is provided with a convex shape corresponding to the back side curved V-shaped valley 18 in the virtual united shape 15. Since the protruding portion Y is configured, the fluid pressure loss in the T-shaped flow passage 10 can be significantly reduced, and a sufficient fluid flow to the branch flow passage 27 side can be performed more smoothly. Moreover, the formation of the guide protrusion Y and the formation of the branching central region 10P corresponding to the virtual united shape 15 in which the pair of virtual elbow bodies 11, 11 having a circular cross section are united back to back are relatively simple circles. This can be performed simultaneously by a manufacturing apparatus (see FIGS. 12 to 15) using the arc-shaped core pin 51, the third core pin 53 and the like.
In particular, in the conventional resin joint body 75 shown in FIG. 22, the bend from the main flow path portion 78 to the branch flow path portion 79 is rapidly changed in direction along the right-angled edge 83. The pressure loss due to the nearby turbulent flow was large, and the flow rate to the branch flow passage portion 79 was further reduced, while in the present invention, while maintaining the circular cross section, the above-mentioned is provided on the curved inner peripheral side. There are no right-angled edges 83, and a higher flow is delivered to the branch flow 27 with a small pressure drop. Moreover, there is an advantage that the joint body 1 is compact as a whole.

1 Joint body
10 T-shaped flow path
10P branch central area
11 virtual elbow body
12 One side
13 Other end surface
15 virtual coalescing shape
18 Back curve V-shaped valley M Main flow path S Sub flow path (branch flow path)
X Inner surface on the side opposite to Y Y Guide protrusion

Claims (2)

A joint main body (1) made of synthetic resin is provided, and the joint main body (1) is orthogonal to the main flow passage (M) through which the fluid flows in and out from the opposite side of 180° and the main flow passage (M). In a T-type pipe joint provided with a T-shaped flow path (10) consisting of a sub-flow path portion (S) branching in the direction,
The guide ridge (Y) that guides a part of the fluid passing through the main flow channel (M) to the sub flow channel (S) is provided on the opposite branch side of the main flow channel (M). A T-type pipe joint formed on the inner surface (X). A pair of virtual elbow bodies (11) (11) having a circular cross section are arranged back-to-back with their one end faces (12) (12) facing in opposite directions by 180°, and are arranged symmetrically about each other to be brought close to each other. , Into a virtual united shape (15) which is united so that the other end faces (13) (13) are aligned,
By setting the inner surface shape of the branching central region (10P) of the T-shaped flow path (10),
Moreover, the one end faces (12) (12) are made to correspond to the main flow passage part (M) side, and the other end face (13) is made to correspond to the sub flow passage part (S) side,
The T-type pipe joint according to claim 1, wherein the guide protrusion (Y) is configured to have a convex shape corresponding to the back-side curved V-shaped valley (18) in the virtual united shape (15).

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