JP6807111B2 - Manufacturing equipment for T-shaped joint body - Google Patents

Description

The present invention relates to a manufacturing apparatus for a T-shaped joint body, which is also called a three-way joint or cheese.

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

Design Registration No. 1091181

FIG. 23 (A) shows an example of the connection pipe of the T-shaped pipe joint 85 provided with the conventional joint body 75 (as shown in FIG. 22). In FIG. 23 (A), three T-shaped 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, and further, T-type pipe joints are formed. A simplified diagram shows a case where branch pipes P ₃₀ , P ₃₁ , and P ₃₂ are connected to each of 85 to form branch flow paths 82, 82, and 82.

If you use this good UNA joint body 75, there are the following problems.
That is, the arrow F _{81 in} FIGS. 22 and 23 indicates the flow rate of the fluid flowing through the main flow path 81, the arrow F ₈₂ indicates the flow rate of the fluid flowing through the branch flow path 82, and the flow rate F ₈₂ on the branch side is. The problem is that the flow rate is extremely small compared to the flow rate F ₈₁ on the main side. Depending on the arrangement direction, arrangement height, etc. of the branch pipes P ₃₀ , P ₃₁ , and P ₃₂ , the flow rate F ₈₂ on the branch side may become zero, or even backflow may occur.
The cause is, as shown by arrow F ₈₁ in FIG. 22, when the fluid flows in the main flow path portion 78 in the linear direction at high speed, according to Bernoulli's theorem, the sub flow path portion (crossed at a right angle). It is presumed that this is because the pressure inside 79 is reduced or the pressure becomes negative.

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.

The present onset Ming, a main flow passage portion through which fluid inflow and outflow from 18 0 ° opposite side, a side-stream path portion that branches from the main flow passage portion along the perpendicular direction, the T-shaped flow path consisting of A mold for molding the provided T-shaped joint body by injection molding of a thermoplastic resin is provided, and the mold has a curved substantially T-shaped cavity corresponding to the outer surface shape of the joint body, and the cavity is provided. A pair of actuating pins that can be approached and separated while reciprocating in a straight line are arranged with respect to the two opening ends on the opposite sides of the main flow path portion of 180 °, and further, the tip portion of each actuating pin is An arc-shaped core pin having a circular cross section is attached, and a second core pin surrounding the base end side of the arc-shaped core pin as the first core pin is arranged so as to be able to enter and leave the opening end of the cavity. Further, the second core pin is fitted so as to be linearly reciprocating and slidable along the same axis with respect to the operating pin, and as the tip of the operating pin approaches or enters the open end, the above The arc-shaped core pin is inserted while swinging along the arc-shaped axis of the substantially T-shaped cavity, and the arc-shaped core pin is separated or escaped from the opening end of the tip of the operating pin. Is provided with an arcuate motion forcing means that is pulled out from the cavity while swinging along the arcuate axis, and a guide plate having a circular hole for guidance is provided at the tip of the second core pin. The arc-shaped motion forcing means is attached, and is composed of the circular hole for guidance and a cam mechanism that interlocks and connects the base end of the arc-shaped core pin and the tip of the operating pin. A third core pin that linearly reciprocates with respect to the pipe insertion tube portion forming portion corresponding to the portion is provided, and a small semicircular concave portion is formed at the tip of each of the pair of arcuate first core pins. The 3-core pin has a small circular protrusion for positioning at the tip integrally, and the arc-shaped core pin is inserted into the two opening ends on the opposite sides of the 180 °, and the core pin corresponds to the sub-flow path portion. The third core pin that linearly reciprocates with respect to the pipe insertion tube forming portion is inserted, and the small circular protrusion is densely inserted into the small circular concave recess formed by the pair of semicircular concave recesses. Under the combined state of the pair of the arcuate core pins and the one third core pin, the thermoplastic resin is injection-molded to form the peripheral wall of the T-shaped flow path. It is a manufacturing device for the mold joint body.

The manufacturing apparatus of the present invention has made it possible to reliably and efficiently manufacture a T-shaped joint body in which a fluid flows evenly in a branch pipe (secondary pipe) that branches at a right angle from the main pipe .

It is a vertical cross-sectional view which shows an example of the T-type pipe joint including the T-type joint body manufactured by this invention. It is a perspective view for explaining the inner surface shape of a T-shaped flow path, (A) is a perspective view for explaining a pair of virtual elbow bodies approaching each other in a back-to-back posture, and (B) is a virtual united shape. It is a perspective view. It is a perspective view of a joint body. It is a front view. It is a side view. It is a vertical sectional view of a pipe joint main body. It is a perspective view which shows another example of the T-type pipe joint provided with the T-type joint body manufactured by this invention . It is a side view. It is a front view. It is a vertical sectional view. It is a bottom view. It is sectional drawing which shows one embodiment of the T-shaped pipe joint manufacturing apparatus which concerns on this invention, and shows the state before inserting a core pin into a cavity of a mold. It is sectional drawing which shows the state immediately after inserting a core pin into a cavity of a mold and injecting a resin. It is sectional drawing which shows the state in the middle of drawing which the resin formed after the lapse of a predetermined time from injection molding moved outward along the arcuate axis after cooling. It is sectional drawing which shows the state which the core pin was pulled out, and the pipe joint body which was injection-molded just before being taken out from a mold. It is a figure which shows the specific example of a core pin, (A) is a perspective view from the tip upward direction, (B) is a side view from the tip direction, (C) is a perspective view from the tip downward direction, (D) is a view. It is a perspective view from the lower side of a base end. It is a figure which shows the operation block, (A) is a front view, (B) is a side view. It is a figure which shows the guide cylinder, (A) is a front view, (B) is a side view. It is a figure which shows the 2nd core pin, (A) is a front view, (B) is a partial cross-sectional side view. The operating pin is shown, (A) is a side view, (B) is a front view, and (C) is an enlarged sectional view taken along the line CC of (A). It is a figure for demonstrating the anti-branch side inner surface X on which the guide ridge portion should be arranged, (A) is a front sectional view, (B) is a side view, and (C) is a perspective explanatory view. It is a vertical cross-sectional view which shows the conventional T type pipe joint . It is a pipe connection diagram for comparing and explaining the operation and effect of the conventional T-type pipe joint and the T-type pipe joint manufactured by the manufacturing apparatus of the present invention, and (A) is the conventional T-type pipe joint . The piping connection diagram, (B) is a piping connection diagram of a T-shaped pipe joint manufactured by the manufacturing apparatus of the present invention.

Hereinafter, the present invention will be described in detail based on the illustrated embodiments.
Joint body 1 made of manufacturing synthetic resin by the manufacturing apparatus according to the present onset Ming, for example, as shown in FIGS. 1 to 6, used in the T-type fitting 40. The joint body 1 is a T-shaped flow path 10 composed of a main flow path portion M in which a fluid flows in and out from the opposite side by 180 °, and a sub flow path portion S branching in an orthogonal direction from the main flow path portion M. It has.
Then, as shown in FIGS. 1, 6 and 5, an induction ridge portion Y that deflects and guides a part of the fluid passing through the main flow path portion M to the sub flow path portion S is provided by the main flow path portion M. Formed on the inner surface of. That is, the induction ridge portion Y is formed on the anti-branch side inner surface X in the main flow path portion M (see FIG. 21).

Here, the "anti-branch side inner surface X" and the "formed on the anti-branch side inner surface X" will be specifically described below.
FIG. 21 is a diagram showing a smooth main flow path portion 78 and a sub flow path portion 79 orthogonal to the smooth main flow path portion 78 shown in FIG. 22 as a model diagram. In FIG. 21, it has an axial dimension W ₀ corresponding to the diameter Ds of the sub-channel portion 79, is an inner surface 180 ° opposite to the sub-channel portion 79, and has a central angle θ of 180 °. The region is referred to as the anti-branch side inner surface X. Therefore, in the embodiment of FIGS. 1 and 6, the inner diameter dimension of the minimum inner diameter portion 2 of the subchannel portion S is set to the diameter Ds (of FIG. 21), and the induction ridge portion Y does not exist (). If the inner surface of the hole (shown by the alternate long and short dash 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 induction ridge Y is formed on the inner surface X on the anti-branch side" is
(A) When all the induction ridges Y are formed only on the inner surface X on the anti-branch side.
(B) When the most protruding portion of the induction ridge Y exists on the inner surface X on the anti-branch side, but a part of the inner surface X on the anti-branch side is present.
It is defined as including all of the above (a) and (b).

5, the joint body 1 shown in FIG. 6, and, (described later) FIG. 8, the joint body 1 of FIG. 10, the latter (b), the applicable. In other words, in FIGS. 5 and 8, the guided ridges Y are arranged in a stretched manner up to a central angle range larger than θ = 180 ° shown in FIG. 21, and further, in FIGS. 6 and 10. In this example, a case where the guided ridges Y are arranged in a stretched manner in the axial direction with respect to W ₀ shown in FIG. 21 is illustrated.

Next, FIGS. 1 and, the central branch of the T-shaped joint body 1, is T-shaped flow channel 10 et in definitive the T-shaped joint body 1 shown in FIGS. 7 to 11 shown in FIGS. 3 to 6 The three-dimensional shape of the region 10P and the induction protrusion Y will be described below.
First, the branching central region 10P will be described with reference to FIGS. 1 and 6. In the T-shaped flow path 10 of the joint body 1, a slightly large-diameter pipe insertion tube portion 5, 5, 5 into which the pipe P is inserted is formed, and a sealing function such as a sealing material 9 is added, or A pipe pull-out prevention function is added (not shown).

A bag nut 7 is screwed to the outer periphery of the insertion cylinder 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 pull-out prevention 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 fluid branching.

In FIG. 1, the end portion 20 in the three directions of the branching central region 10P is formed with a stepped portion, and the tip of the pipe P is in close proximity to or abuts on the end portion 20 composed of the stepped portion. Alternatively, the mark and guide ring 14 as shown in FIG. 1 comes into contact with each other. Further, as shown in FIG. 1, the reinforcing metal cylinder 16 may come close to or abut on the end portion 20.

FIG. 2 is a virtual diagram for explaining the three-dimensional shape of the above-mentioned central region 10P for branching and the guided ridge portion Y.
That is, assume a pair of virtual elbow bodies 11 and 11 having a circular cross section. The pair of virtual elbow bodies 11 and ₁₁ are brought close to 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 shown by arrows E and E. In this back-to-back posture, the end faces 12 and 12 of the pair of virtual elbow bodies 11 and 11 face 180 ° in opposite directions and pass through the center points of the end faces 12 and 12 and are an extension straight line of the axis L ₁₁ . L ₁₁₀ coincides (that is, forms a straight line as shown in FIG. 2 (A)).

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

In each of the T-shaped pipe joints shown in FIGS. 1, 3 to 6, and 7 to 11, the inner surface shape of the central region 10P of the T-shaped flow path 10 of the joint body 1 is the virtual shape described above. Matches the combined shape.
More specifically, the one end surfaces 12 and 12 of the virtual united shape 15 (see FIG. 2B) are shown in FIGS. 1, 6, 10 and the main flow path portion of the central region 10P for branching. Let it be M (end 20).

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

Then, by setting the inner surface shape of the central region 10P for branching in the virtual united shape 15 as described with reference to FIGS. 2 (A) and 2 (B), the guided ridge portion Y becomes the back in the virtual united shape 15. It is formed in a convex shape corresponding to the laterally curved V-shaped valley 18.

Further, in FIG. 2 (B), the (eye) 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 resistance of the flow from the main flow path portion M to the sub flow path portion S decreases in a circular shape, and the flow rate Fs flowing to the sub flow path portion S more smoothly in cooperation with the induction ridge portion Y becomes It will be 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 to be described in more detail, it corresponds to the one end surface 12 and the other end surface 13 shown in FIG. 2 (B). The cross-sectional shape of the end portion 20 (shown in FIGS. 6 and 10) is circular, and the central portion (in FIGS. 6 and 10) of the central region 10P is such that the circular and circular parts partially overlap. It is a variant with a slightly larger cross-sectional area.

Next, with respect to the joint body 1 of the T-shaped pipe joint 40 shown in FIG. 1, if it will be described in detail together with FIGS. 3 to 6, the reinforcement provided in a straight shape on the side opposite to the sub-flow path portion S side. The rib 21 and the reinforcing rib 22 attached in a T shape on the front and rear side surfaces are provided on the outer surface in a protruding shape.
Further, the case where the joint body 1 has an inner / outer double structure made of a transparent resin (in FIGS. 1 and 6) is illustrated. The bag nut 7 is made of opaque resin.

Reference numeral 23 denotes a locking small projectile that functions to prevent the bag nut from rotating in the tightened state, and is integrally formed by injection molding of the thermoplastic resin of the joint body 1. A large number of unequal-sided triangular teeth are provided on the inner peripheral surface of the inner end of the bag nut 7, and the female screw 24 of the bag nut 7 is screwed into the male screw 6 near the final tightening state. , The structure is such that the above-mentioned teeth click over the locking small protrusion 23 and maintain the final tightening state at the end.

In the T-shaped joint main body 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 thinner by a wall thickness than the inner surface shape of the central region 10P of the internal T-shaped flow path 10 (that is, the virtual three-dimensional shape of FIG. 2B).

The male screw 6 shown in FIGS. 3 to 6 is omitted in the pipe insertion tube portion 5 shown in FIGS. 7 to 11. The inner peripheral surface on the inner end side of the cylindrical ring (not shown) corresponding to the bag nut 7 is configured to be externally fitted to the pipe insertion cylinder portion 5 as a smooth circumferential surface and fixed and integrated with an adhesive or the like.
Further, in the bottom view of FIG. 11, the ridgeline of the guided ridge portion Y can be seen in a vertical single character shape.

Next, the manufacturing method and the manufacturing apparatus for the joint body 1 described above will be described below.
12 to 15 show a method of manufacturing the joint body 1 by injection molding of a thermoplastic resin, and an embodiment of a manufacturing apparatus. Reference numeral 31 denotes a mold for forming the T-shaped (cheese-shaped) joint body 1, and is composed of a pair of nests 32 and 32 that can be combined and separated on a plane parallel to the paper surface 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 nests 32 and 32.

The cavity 33 includes a joint outer surface center forming portion 33A (indicated by dots) for forming the joint body outer surface central portion corresponding to the branching central region 10P (see FIG. 6), and three sides from the central forming portion 33A. It is composed of a pipe insertion cylinder portion forming portion 33B (for forming the pipe insertion cylinder portions 5, 5 and 5 of FIG. 6) extending to. Then, it has opening ends 33M, 33S, 33M that open from the mold 31 in three directions forming 90 °. The opening ends 33M and 33M are arranged on opposite sides by 180 ° and correspond to the positions of the opening 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 subchannel portion S in FIG. Reference numerals 35 and 35 are a pair of actuating pins that can be approached and separated while reciprocating in a straight line 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 and so as to approach and separate from opposite directions, and as shown in FIGS. 12 to 13, the open end 33M of the mold 31 is provided. , 33M approaches 33M while operating linearly, the tip 35A invades, and pulls out (backward) from FIG. 13 to FIG. 14 to FIG. 15 to separate from the opening end 33M.

As shown in FIG. 20, the actuating pin 35 is a pair of cross-sectional three months formed by a basic columnar portion 35B, a square plate piece-shaped base portion 35C, and a concave groove 35E formed in a notch shape from the tip surface 35D. It has the mold projecting pieces 35F and 35F integrally. Moreover, as shown in the side view of FIG. 20 (A), the projecting pieces 35F and 35F of the tip 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. 20C).

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

As shown in FIGS. 12 to 15, a projecting piece in which a movable cam shaft 44 is fitted to the cam hole 35H formed in the tip portion 35A of the operating pin 35 and is continuously provided to the arcuate core pin 51. It is inserted (press-fitted) and fixed to the through hole 43 of the portion 42.
That is, the movement of the arcuate core pin 51 on the proximal end side is regulated by the cam hole 35H and the cam shaft 44.

At a 12 to 15 and 17, 36 and 36, by an actuator such as an unillustrated cylinder, a hydraulic block that linearly reciprocates as shown by an arrow N _6, N _7, said actuating pin 35 is inserted It has a hole 36A to be fixed. Further, in the actuating block 36, a recess 36B is formed on one surface in contact with the mold 31 so as to be concentric with the hole 36A for the actuating pin 35, and a guide cap 37 (see FIG. 18) is formed in the recess 36B. ) Is fitted and fixed.
The guide cap 37 is provided with an inner flange portion 37B having a hole 37A at the tip thereof, and the guide cap 37 can be linearly reciprocated (in the axial direction) in the guide cap 37, and the second core pin 52 is formed as an inner fitting shape. It is assembled.

That is, the arc-shaped core pin 51 described above is referred to as a first core pin, and the core pin 52 that moves linearly back and forth is referred to as a second core pin.
The second core pin 52 has a shape as shown in FIG. 19, and has a square plate piece portion 52A for non-rotation at the base end in the shape of an outer collar, and a hole into which the operating pin 35 can be inserted. It has 52B over almost the entire length. Further, it is a tubular body having a plurality of steps of outer peripheral surfaces, and as shown in FIG. 6 or 10, a step is formed in the vicinity of the opening end of the main flow path portion M, that is, the hole inside the pipe insertion cylinder portion 5. Form in a 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 regulated by the guiding circular hole 52C formed through the guide plate 52D.

That is, in the pipe joint manufacturing apparatus shown in FIGS. 12 to 20, the arc-shaped core pin 51 is inserted while swinging along the arc-shaped axis L ₃₃ of the cavity 33 shown in FIGS. 12 and 13. It is provided with an arcuate motion forcing means Z that is pulled out and is pulled out.
The arcuate motion forcing means Z is composed of a guiding 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, the third core pin 53 is added. The third core pin 53 is a linear motion pin that inserts and exits while linearly reciprocating with respect to the pipe insertion tube portion forming portion 33B corresponding to the subchannel portion S.
The third core pin 53 is a solid rod-like 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 a small-diameter positioning protrusion 53A is provided at the tip thereof. , Have one. The linear motion 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 tip of the curved pin main body 51A intersects at a substantially right angle. It is formed with a surface 51B and a second tip surface 51C.
In the injection-molded state shown in FIG. 13, the pair of first core pins 51 and 51 are in a state of close pressure contact with the first tip surfaces 51B and 51B. Further, the second tip surface 51C is in close contact with the tip of the third core pin 53.

However, a small semicircular recess 51D is formed on the second tip surface 51C of the first core pin 51, and as described above, the pair of core pins 51 and 51 are pressure-welded to the first tip surfaces 51B and 51B. In this state, a pair of concave recesses 51D and 51D form a small circular recess, and the protrusion 53A of the third core pin 53 is fitted to the small circular recess as shown in FIG. However, this fitting ensures that the tips of the pair of first core pins 51, 51 are held (centered) in the correct position. That is, even though 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, the first one. Centering is difficult because the tip of the core pin 51 fluctuates. The tip of the third core pin 53, which penetrates such a problem while linearly moving and is stably centered, and the tip of the pair of first core pins 51, 51 are engaged (fitted) with each other. ) It can be solved by setting it to the state.

From the state shown in FIG. 12, the first core pins 51 and 51 and the third core pin 53 are inserted into the mold 31, and the small circular protrusions are provided with respect to the small circular recesses 51D and 51D formed by the semicircular recesses 51D and 51D. If the thermoplastic resin is injection-molded under the combined state of the pair of first core pins 51 and 51 and one third core pin 53 as shown in FIG. 13 in which 53A is tightly fitted, the meat is equal. With the thickness, the surrounding (surrounding) wall of the T-shaped flow path 10 can be formed.

Incidentally, after the injection molding, as shown in FIG. 14 from FIG. 13, if retraction of the actuation block 36 in the arrow N ₇ direction, the first core pin 51 and 51 with circular motion is withdrawn, in FIG. 15 It becomes a state.
After cooling, the mold 31 is separated and opened with the paper surface of the drawing as a parting line, and the joint body 1 as a molded product is taken out.

FIG. 23B is a pipe connection diagram in which piping is performed in the T-shaped pipe joint 40 using the above-mentioned joint body 1. In FIG. 23 (B), three T-shaped pipe joints 40 are sequentially connected by main pipes P ₀ , P ₁ , P ₂ , and P ₃ to form a main flow path 26, and further, T-type pipe joints are formed. The case where branch pipes P ₂₀ , P ₂₁ , and P ₂₂ are connected to each of 40 to form branch flow paths 27, 27, and 27 is shown.
In FIGS. 1 and 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. Shown.

Since the above-mentioned joint body 1 is provided with the guided ridge portion Y as described above, the problem that the flow rate Fs on the branch side is extremely smaller than the flow rate Fm on the main side is solved. There is. That is, a sufficient value of Fs is obtained as compared with Fm. In addition, there is no fear that Fs becomes zero or even negative (backflow). The good sea urchin, a T-fitting 40, by using the pipe connection, that can be solved problem previously connected faucets and warm water machine or the like of the branch channel 27 can not be used, Figure 23 shows.

The manufacturing apparatus of the present invention has made it possible to reliably and efficiently manufacture a T-shaped joint body in which a fluid flows evenly in a branch pipe (secondary pipe) that branches at a right angle from the main pipe.

As described in detail above, the pipe joint manufactured by using the present invention includes a joint body 1 made of synthetic resin, and the main flow path portion where the fluid flows in and out from the opposite side of the joint body 1 by 180 °. In a T-shaped pipe joint including a T-shaped flow path 10 including M, a sub-flow path portion S branching in a direction orthogonal to the main flow path portion M, and passing through the main flow path portion M. Since the induction ridge portion Y that deflects and guides a part of the fluid to the sub-flow path portion S is formed on the anti-branch side inner surface X of the main flow path portion M, it is connected to the sub-channel portion S side. The conventional problem that sufficient fluid flow cannot be obtained in the pipe (branch flow path 27) can be solved with a simple shape (configuration).

In addition, a pair of virtual elbow bodies 11 and 11 having a circular cross section are arranged symmetrically in a back-to-back posture with one end surfaces 12 and 12 facing 180 ° in opposite directions, and are brought close to each other. The virtual united shape 15 in which the end faces 13 and 13 are united so as to coincide with each other; the inner surface shape of the branching central region 10P of the T-shaped flow path 10 is set; and the one end surfaces 12 and 12 are used as the main. Corresponding to the flow path portion M side and the other end surface 13 as the sub flow path portion S side; with a convex portion shape corresponding to the back side curvature substantially V-shaped valley 18 in the virtual united shape 15, the guidance Since the protruding portion Y is configured, the fluid pressure loss in the T-shaped flow path 10 can be remarkably reduced, and sufficient fluid flow is more smoothly performed to the branch flow path 27 side. Moreover, the formation of the induction ridge Y and the formation of the central region 10P for branching that matches the virtual united shape 15 in which the pair of virtual elbow bodies 11 and 11 having a circular cross section are united back to back are relatively simple circles. It can be performed at the same time by a manufacturing apparatus (see FIGS. 12 to 15) using the arcuate core pin 51 and the third core pin 53 or 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 suddenly changes direction along the right-angled edge 83, so that the right-angled edge 83 The pressure loss due to the nearby turbulence was also large, and the flow rate to the branch flow path portion 79 was further reduced, whereas in the present invention, while maintaining the circular cross section, the above is on the inner peripheral side of the curve. There is no right-angled edge 83 at all, and with a small pressure drop, a higher flow rate is sent to the branch flow rate 27. Moreover, there is an advantage that the entire joint body 1 is compact.

1 Fitting body
10 T-shaped flow path
Central area for 10P branching
11 Virtual elbow body
12 One end
13 The other end
15 Virtual coalescence shape
18 Back side curve V-shaped valley
31 mold
33 Cavity
33B Pipe insertion tube forming part
33M opening edge
35 Acting pin
35A tip
51 Arc-shaped core pin (first core pin)
51D concave
52 2nd core pin
52C Circular hole for guidance
53 3rd core pin
53A Small circular protrusion for positioning
K cam mechanism
L ₃₃ Arc-shaped axis M Main flow path S Sub flow path (branch flow path)
X Anti-branch side inner surface Y Guide ridge
Z Arc-shaped motion forcing means

Claims (1)

A T-shaped flow consisting of a main flow path portion (M) in which fluid flows in and out from the opposite side of 180 ° and a sub flow path portion (S) branching in the orthogonal direction from the main flow path portion (M). A mold (31) for molding a T-shaped joint body (1) provided with a path (10) by injection molding of a thermoplastic resin is provided, and the mold (31) has an outer surface shape of the joint body (1). Has a curved approximately T-shaped cavity (33) corresponding to
A pair of actuating pins (35) that can be approached and separated while linearly reciprocating with respect to two open ends (33M) (33M) on the 180 ° opposite side of the main flow path portion (M) of the cavity (33). ) (35) are arranged, and an arcuate core pin (51) having a circular cross section is attached to the tip (35A) of each of the operating pins (35).
A second core pin (52) surrounding the base end side of the arcuate core pin (51) as the first core pin is disposed with respect to the open end (33M) of the cavity (33) so as to be able to enter and leave. Further, the second core pin (52) is externally fitted so as to be linearly reciprocating and slidable along the same axis with respect to the operating pin (35).
As the tip of the actuating pin (35) approaches or invades the open end (33M), the arcuate core pin (51) becomes the arcuate axis (L ₃₃ ) of the substantially T-shaped cavity (33). ), And the arcuate core pin (51) becomes the arcuate axis as the tip of the actuating pin (35) separates or escapes from the open end (33M). A circular motion forcing means (Z) that is pulled out from the cavity (33) while swinging along (L ₃₃ ) is provided.
A guide plate (52D) having a guiding circular hole (52C) is attached to the tip of the second core pin (52), and the arc-shaped motion forcing means (Z) is the guiding circular hole (52C). It is composed of a cam mechanism (K) that interlocks and connects the base end of the arcuate core pin (51) and the tip of the actuating pin (35).
A third core pin (53) that reciprocates linearly with respect to the pipe insertion cylinder portion forming portion (33B) corresponding to the subchannel portion (S) is provided.
A small semicircular recess (51D) is formed at the tip of each of the pair of arcuate first core pins (51) and (51).
The third core pin (53) integrally has a small circular protrusion (53A) for positioning at the tip thereof.
The arc-shaped core pins (51) and (51) are inserted into the two open ends (33M) (33M) on the opposite sides of the 180 °, and the pipe insertion tube portion corresponding to the sub-flow path portion (S). The third core pin (53) that reciprocates linearly with respect to the forming portion (33B) is inserted, and the small circular concave recess formed by the pair of semicircular concave recesses (51D) (51D) is formed. The thermoplastic resin is injected under the combined state of the pair of arcuate core pins (51) (51) and one of the third core pins (53) in which the small circular protrusion (53A) is tightly fitted. An apparatus for manufacturing a T-shaped joint body, characterized in that the peripheral wall of the T-shaped flow path (10) is formed by molding .

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