JP4271638B2 - Resin pipe fittings - Google Patents

Description

  The present invention relates to a resin pipe joint for peripheral equipment for semiconductor manufacturing, which transports ultrapure water, high-purity chemical liquid, and the like, and a resin pipe joint for piping in the chemical industry.

  Conventionally, various pipe joints have been proposed in order to improve the sealing performance and ensure a stronger pull-out strength (see, for example, Patent Documents 1-6 below). Fig.8 (a) has shown sectional drawing of the basic structure of the pipe joint proposed by the following patent document 1. FIG. The tube 110 is attached to the joint body 112 with the inner ring 111 attached to the inner peripheral surface side. The male screw of the joint body 112 and the female thread of the fastening member 113 are screwed together, and the fastening member 113 is fixed to the joint body 112. By applying a predetermined torque to the tightening member 113, the tube 110 is pressed against the tapered portion of the inner ring 111, and the pull-out strength of the tube 110 is ensured.

  FIG. 8B shows a cross-sectional view of the basic structure of a pipe joint proposed in Patent Documents 2 and 3 below. The tube 120 is attached to the joint body 122 with the inner ring 121 attached to the inner peripheral surface and the outer ring 125 attached to the outer peripheral surface. The female thread of the tightening member 123 is screwed into the male thread of the joint main body 122, and the tightening member 123 is fixed to the joint main body 122. By applying a predetermined torque to the tightening member 123, the tube 120 is pressed against the tapered portion of the inner ring 121, and the pressing portion 124 integral with the tightening member 123 presses the outer ring 125, and the tube 120 is pulled. The pull-out strength is secured.

Patent Documents 4 to 6 listed below disclose techniques for forming a mounting portion of a resin tube by hot melting or thermal deformation.
JP-A-10-54489 JP-A-10-288286 Japanese Patent Laid-Open No. 2001-21074 JP-A-8-247353 JP-A-4-15389 Japanese Patent Laid-Open No. 4-69488

  However, the conventional pipe joint as described above has the following problems. In the configuration shown in FIG. 8A, the tube 110 is pressed against the tapered portion of the inner ring to ensure the pull-out strength. However, the tube 110 has a carrier flow pressure or a high-temperature carrier flow heat. Therefore, when plastically deformed, the thickness of the tube 110 becomes thin, and the pull-out strength decreases. For this reason, periodic tightening of the tightening member 113 is necessary.

  The configuration as shown in FIG. 8B includes an outer ring 125. When the outer ring 125 is replaced with a tube having a different diameter, the outer ring 125 is replaced with a corresponding diameter. There is no need to replace the joint body. That is, the outer ring 125 itself does not have an effect of improving the pull-out strength, and the pull-out strength has the same problem as the configuration of FIG. In the configuration of FIG. 8B, the pressing portion 124 integrated with the tube tightening member 123 presses the outer ring 125, but does not directly press the tube 120 in the radial direction. If the tightening of the member 123 is loosened, the pressing force is also reduced.

  In the technique of forming the mounting portion of the resin tube as disclosed in Patent Documents 4 to 6 by heat melting or thermal deformation, the tube mounting operation is facilitated, but particles due to deteriorated resin powder (oligomer) If particles are not sufficiently removed due to generation of (fine particles), particles on the outside of the tube will cause contamination of clean rooms such as semiconductor equipment, and particles on the inside of the tube will cause foreign matter to be mixed into the transport flow. It also causes a decrease in purity. Furthermore, if such a heating and press-fitting method is used, the laminar flow state of the air in the clean room will be disturbed.

  Moreover, even when a pipe joint such as that disclosed in Patent Documents 1 to 3 is used, it is possible to use the heating and press-fitting method, and the use of the heating and press-fitting method causes the above-described problems. .

  The present invention solves the conventional problems as described above, and an object of the present invention is to provide a resin pipe joint that can improve the pull-out strength of the tube and can be integrated into a room temperature press-fitting method. .

In order to achieve the above object, a first resin pipe joint of the present invention is a resin pipe joint that connects a resin tube through a joint body, and includes an inner annular member attached to the joint body; A tube assembly including an outer annular member and a fastening member , wherein the resin tube is attached to an outer peripheral surface of the inner annular member, and the outer annular member is attached to an outer peripheral surface of the resin tube. The outer annular member itself presses the resin tube against the outer peripheral surface of the inner annular member, and the outer annular member deforms along the shape of the outer peripheral surface of the resin tube. In the state where the tube assembly is mounted on the inner peripheral surface side of the joint body, a fastening member inserted through the resin tube is fastened to the joint body.

The second resin pipe joint of the present invention is a resin pipe joint for connecting a resin tube through a joint body, and includes an inner annular member attached to the joint body, and a fastening member. A tube assembly is formed by press-fitting the resin tube on the outer peripheral surface of the inner annular member, and the tube assembly is mounted on the inner peripheral surface side of the joint body. The fastening member that has been inserted through the resin tube is fastened to the joint body, and the outer diameter of the outer peripheral surface of the inner annular member increases toward the rear from the tip toward the inlet side of the resin tube. In the state before the fastening member is inserted through the resin tube, of the inner diameters of the fastening members, the inner diameter of the contact portion to the resin tube is d1, resin When the outer diameter of the tube d2, the side of an acute angle and alpha (degrees) of the angle between the inclined surface and the horizontal surface of the tapered portion,
d1 ≦ d2
35 ≦ α ≦ 45
It is characterized by satisfying the relationship.

  According to the present invention, the pull-out strength of the tube can be improved, and the construction method can be unified to the room temperature press-fitting method.

  Since the 1st resin pipe joint of this invention is a structure which an outer annular member presses a tube, it can improve the pull-out strength of a tube and can unify a construction method into a normal temperature press-fitting system.

  The second resin pipe joint of the present invention satisfies the relationship between predetermined dimensions and angles, so that the tube can be reliably pressed and the tube insertability can be ensured.

  Moreover, according to the joint method of the resin pipe joint of the present invention, the pull-out strength of the tube can be improved, and the construction method can be unified to the room temperature press-fitting method.

  In the first resin pipe joint of the present invention, a first step for pawling the outer peripheral surface of the inner annular member when temporarily fixing the outer annular member, and the first step It is preferable that a second step is formed on the side opposite to the inlet side of the resin tube, and the second step for pawling when the outer annular member is finally fixed. According to this configuration, since the first step is formed, the movement of the outer annular member to the rear is stopped, and the tip of the tube easily gets over the contact portion between the inner annular member and the outer annular member. Since the second step is formed, the final pawl of the outer annular member is ensured.

Moreover, the taper part which the outer diameter becomes large as it goes to back from the front-end | tip is formed in the inlet side of the said resin-made tubes among the outer peripheral surfaces of the said inner side annular member,
In a state before the fastening member is inserted into the resin tube, among the inner diameters of the fastening member, the inner diameter of the contact portion to the resin tube is d1, the outer diameter of the resin tube is d2, Of the angles formed by the inclined surface of the tapered portion and the horizontal plane, the acute angle side is α (degrees).
d1 ≦ d2
35 ≦ α ≦ 45
It is preferable to satisfy this relationship. According to this configuration, the tube can be reliably pressed and the insertion property of the tube can be ensured.

Further, of the inner diameter of the joint body, the inner diameter of the mounting portion of the tube assembly is d3, and the outer diameter of the outer annular member of the portion corresponding to the inner peripheral surface of the joint body is d4. Then,
d3 ≦ d4
It is preferable to satisfy this relationship. According to this configuration, the tube is more firmly fixed, the pull-out strength of the tube is improved, and the tube is less likely to come off.

  In addition, a taper portion having an outer diameter that increases from the tip toward the rear is formed on the inlet side of the resin tube in the outer peripheral surface of the inner annular member, and the tip portion of the taper portion is chamfered. It is preferable. According to this configuration, the retention and accumulation of impurities can be prevented.

  Moreover, it is preferable that the contact part with the edge part of the said inner side annular member is chamfered among the internal peripheral surfaces of the said coupling main body. According to this configuration, the retention and accumulation of impurities can be prevented.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

(Embodiment 1)
1 and 2 are cross-sectional views of the main steps of the joint work related to the resin pipe joint according to Embodiment 1, and FIG. 3 is an enlarged view of the main part of the inner ring that is the inner annular member. The outer ring 2, the inner ring 1, the tube 3, the joint body 10, and the cap nut 11 that is a tightening member are all made of resin. In order to ensure chemical resistance and heat resistance, for example, a fluororesin is used.

  FIG. 1A shows a state before the outer ring 2 is attached to the inner ring 1. The outer ring 2 is attached to the inner ring 1 by pushing the outer ring 2 into the inner ring 1 previously attached to the jig 4. The jig 4 is attached to a press-fitting device (not shown). If the jig 4 is set so as to fix the position of the jig 4, the outer ring 2 can be attached manually.

  Before the outer ring 2 is attached, the inner diameter B of the outer ring 2 is smaller than the outer diameter A on the inlet side of the outer ring 2 in the outer periphery of the inner ring 1. For this reason, the outer ring 2 is press-fitted into the inner ring 1. Further, as shown in FIG. 3, the outer diameter dimension C of the rear portion is larger than the outer diameter dimension A with respect to the inlet side of the outer ring 2. For this reason, the step 5 formed by the dimensional difference between the dimension A and the dimension C can be used as a guide for the mounting position of the outer ring 2, and the outer ring 2 is in contact with the step 5 until it is pawled. Ring 2 will be pushed in.

  The difference between the outer diameter dimension A and the inner diameter dimension B is, for example, in the range of 0.25 mm to 0.75 mm, and the difference between the outer diameter dimension A and the outer diameter dimension C is, for example, in the range of 0.5 mm to 1 mm. It is.

  FIG. 1B shows a state before the tube 3 is attached to the inner ring 1. In the state of this figure, the attachment of the outer ring 2 to the inner ring 1 is completed. The position of the tube 3 is fixed via a holder 6. For this reason, if the jig | tool 4 is moved to the arrow a direction using a press injection apparatus, mounting | wearing of the tube 3 to the inner side ring 1 will be started.

  FIG. 2A shows a state where the tube 3 is being attached. In the state of this figure, the tip of the tube 3 rides on the tapered portion 1a of the inner ring 1, and the inner diameter of the tip of the tube 3 is increased. The tip of the tube 3 is located at a gap 7 (FIG. 3) having a substantially V-shaped cross section formed between the inner surface of the outer ring 2 and the tapered portion 1 a of the inner ring 1. If the jig 4 is further moved in the direction of arrow a from this state, the tip of the tube 3 pushes and spreads the outer ring 2, while the abutting portion 8 between the inner surface of the outer ring 2 and the inner ring 1 (FIG. 3). ) Will be exceeded.

  While the tip of the tube 3 is in the position of the gap 7 having a substantially V-shaped cross section, the inner peripheral surface of the outer ring 2 acts so as to press the outer peripheral surface of the tube 3, and the gap 7 is attached to the tube 3. Since the interval is narrow in the direction, the tip of the tube 3 can easily get over the contact portion 8.

  Further, since the position movement of the outer ring 2 is stopped by the step 5, the gap 7 remains formed at the initial stage where the tube tip passes over the contact portion 8. That is, a force is applied to the outer ring 2 in a direction in which the outer ring 2 is moved in the mounting direction of the tube 3, but the ease of getting over the contact portion 8 at the tip of the tube 3 is ensured.

  FIG. 2B shows a state where the press-fitting of the tube 3 into the inner ring 1 is completed and the tube assembly 9 is completed. This state is a state in which the movement of the jig 4 in the direction of arrow a is further advanced from the state of FIG. 2A, and the outer ring 2 also advances in the same direction as the mounting of the tube 3 progresses. However, this progression is stopped by the step 5 a formed on the outer peripheral surface of the inner ring 1.

  FIG. 4 is a cross-sectional view showing a process of attaching the tube assembly to the joint body 10. FIG. 4A shows a state before the tube assembly 9 is attached to the joint body 10. From this state, the tube assembly 9 is inserted into the inner peripheral side of the joint body 10, and the cap nut 11, which is a fastening member, is rotated and fastened to the joint body 10. Since this tightening is formed on the outer peripheral surface of the joint body 10, the screw 10 a and the male screw 11 a formed on the inner peripheral surface of the cap nut 11 are screwed together.

  FIG. 4B shows a state in which the tube joint work has been completed. In this state, the two tubes are connected via the joint body 10. The joint operation is completed through the above steps.

  FIG. 5 shows an enlarged cross-sectional view of the main part of the joint portion in a state where the joint work is completed. As described above, when the tube 3 is attached to the inner ring 1, the distal end portion of the tube 3 is expanded in diameter, so that the tube 3 presses the outer peripheral surface of the inner ring 1. Further, since the tube 3 is mounted on the inner peripheral surface side of the outer ring 2 that presses the inner ring 1, the outer ring 2 presses both the tube 3 and the inner ring 1. Become. For this reason, unlike the configuration in which the tube 3 is simply attached to the inner ring 1, the tube 3 is firmly fixed to the inner ring 1 by pressing the outer ring 2.

  The tube 3 is deformed along the shape of the outer peripheral surface of the inner ring 1 and is in close contact with the outer peripheral surface of the inner ring 1. Further, the outer ring 2 is deformed along the shape of the outer peripheral surface of the tube 3 after deformation, and is in close contact with the outer peripheral surface of the tube 3. That is, as the attachment of the tube 3 to the inner ring 1 proceeds, the outer ring 2 deforms following the shape of the outer peripheral surface of the inner ring 1. This also contributes to the firm fixation of the tube 3.

  Thus, since the tube 3 is forcibly press-fitted between the inner ring 1 and the outer ring 2, even if the tube 3 is plastically deformed by the pressure of the conveying flow or the heat of the high-temperature conveying flow, it is always outside. The ring 2 presses the tube 3. For this reason, compared with the structure which does not provide the outer side ring 2 which concerns on this Embodiment, it becomes advantageous with respect to the tube drop prevention by a deformation | transformation of a tube, and the leakage prevention of a conveyance flow.

  In order to obtain this effect, the outer ring 2 needs to press the tube 3 as in the present embodiment, and it cannot be obtained by a configuration in which the outer ring is simply provided.

  Furthermore, the joint method according to the present embodiment uses a room-temperature press-in method instead of using a heat-in press method in which heat melting or heat deformation is performed for mounting the tube 3. Even if the heat press-fitting method is used, the tube 3 cannot be attached to the inner ring 1. This is because immediately before the tube 3 is mounted, the outer ring 2 presses the inner ring 1, so that the tip of the tube 3 softened by heating is inserted up to the gap 7 having a substantially V-shaped cross section shown in FIG. 3. Even if it is possible, the diameter of the outer ring 2 cannot be expanded and the contact portion 8 between the outer ring 2 and the inner ring 1 cannot be exceeded. That is, the joint method according to the present embodiment can be prohibited from being performed by the heating and press-fitting method.

Here, heating the tube facilitates the tube mounting operation, but causes generation of particles (fine particles) due to deteriorated resin powder (oligomer). If the removal of particles is insufficient, the particles outside the tube cause contamination of the clean room such as semiconductor equipment, and the particles inside the tube cause foreign matter to be mixed into the transport flow, which may cause a decrease in purity. Become. Moreover, it will disturb the laminar flow state of the air in the clean room.
Since the joint method according to the present embodiment cannot be performed by the heating and press-fitting method, it is possible to prohibit the tube from being easily heated at the construction site, and the construction method can be unified into the room-temperature press-fitting method.

  This also has an advantage in terms of management. Specifically, when it is confirmed that the outer ring 2 is deformed following the deformation of the tube 3 by looking at the appearance of the joint portion, it can be determined that the operation is performed without heating the tube. That is, the completion of the joint itself indicates that the joint is not heated. Usually, it is difficult to determine whether the heating press-fitting method or the room temperature press-fitting method is used from the appearance of the joint portion, but in the present embodiment, this determination is easy and reliable.

(Embodiment 2)
The second embodiment relates to the dimensional relationship between the cap nut and the tube and the inclination angle of the tapered portion of the inner ring. The pipe joint according to the present embodiment satisfies the following expressions (1) and (2).

Formula (1) d1 <= d2
Formula (2) 35 ≦ α ≦ 45
d1 is an inner diameter of a contact portion to the tube 3 among inner diameters of the cap nut 11, and d2 is an outer diameter of the tube 3 (FIG. 4A). The angle α (degree) is an inclination angle of the tapered portion of the inner ring (FIG. 3). The angle indicates an acute angle side among the angles formed by the horizontal plane and the inclined surface, and the clockwise direction is positive.

  As shown in FIG. 5, in the joint completion state, the edge portion 11 a of the cap nut 11 presses the outer peripheral surface of the tube 3 by tightening the cap nut 11, and the tube 3 is brought into contact with the tapered portion 1 a of the inner ring 1. It is in pressure contact. By satisfying the relationship of the expression (1), the cap nut 11 applies a compressive force in the direction of reducing the diameter of the tube 3 in addition to pressing the tube 3 against the tapered portion 1a. For this reason, when the cap nut 11 is tightened, the edge portion 11a of the cap nut 11 can be prevented from climbing along the taper portion 1a, and the reliability of the pressure contact of the tube 3 is increased.

  On the other hand, by satisfying the relationship of the expression (2), the insertion property of the tube 3 can be ensured while the pressure contact state of the tube 3 is improved. As the angle α (degree) becomes smaller than the lower limit value of the expression (2), the pressure contact force of the tube 3 becomes weaker and the thickness of the tapered portion becomes smaller, so that the durability becomes weaker.

  Further, as the angle α (degrees) becomes larger than the upper limit value of the expression (2), the insertability into the inner ring 1 becomes worse. 2A, when the tube 3 is inserted into the inner ring 1, the tube 3 rides on the tapered portion 1a. As the angle α increases, the jig 4 This is because the thrust also increases. That is, as the thrust of the jig 4 increases, the distal end portion of the tube 3 tends to buckle at the initial stage of insertion of the tube 3 and insertion becomes difficult.

  In the present embodiment, since both the expressions (1) and (2) are satisfied, the tube 3 can be reliably pressed and the insertability of the tube 3 can be ensured. Even if the relationship of the formula (1) is satisfied, if the relationship of the formula (2) is not satisfied, the insertability may be deteriorated or a sufficient pressure contact force of the tube 3 may not be ensured. Moreover, even if the relationship of the formula (2) is satisfied, if the relationship of the formula (1) is not satisfied, the pressure contact force of the tube 3 is compared with the case where the relationship of the formula (1) is satisfied. It will be inferior.

  Although the present embodiment has been described on the premise of the configuration of the first embodiment using the outer ring 2, the present embodiment may be applied to a configuration that does not use the outer ring.

(Embodiment 3)
Embodiment 3 is an embodiment relating to the tip shape of the tapered portion of the inner ring. 6A shows an enlarged view of the tip of the tapered portion of the inner ring 1 according to the present embodiment, and FIG. 6B shows an enlarged view of the tip of the tapered portion of the inner ring 1 according to the comparative example. Show.

  6A is chamfered at the tip 1b, and after the taper 1a, the tip 1c of the contact surface with the inner peripheral surface of the tube 3 is formed on the inner peripheral surface 3a of the tube 3. On the other hand, it is in a position that enters the direction of the outside of the tube 3. Further, the chamfered portion is inclined from the front end portion 1c in the flow direction of the conveying flow (arrow b). For this reason, the stay of the conveyance flow in the vicinity of the tip of the tapered portion can be prevented, and the stay and accumulation of impurities can also be prevented.

  On the other hand, in the configuration of FIG. 6B according to the comparative example, the distal end portion 100 c is substantially at the same position as the inner peripheral surface of the tube 3. For this reason, the tip 100c is liable to float due to the flow of the transport flow, and if the float occurs, it will cause the transport flow to stay and cause impurities to stay and accumulate.

  Next, FIG.6 (c) has shown the enlarged view of the contact part of the inner side ring 1 which concerns on this Embodiment, and a coupling main body, FIG.6 (d) shows the inner side ring 1 which concerns on a comparative example, and FIG. The enlarged view of the contact part with the coupling main body 10 is shown.

  The joint body 10 shown in FIG. 6C has a chamfered portion 10 a formed on the end side of the inner ring 1 on the inner peripheral surface, and the tip of the contact surface between the joint body 10 and the inner ring 1. Reference numeral 10 b denotes a position that enters the outer side of the tube 3 with respect to the inner peripheral surface 1 da of the inner ring 1. Further, the chamfered portion 10a is inclined from the distal end portion 10b in the flow direction of the conveying flow (arrow b). For this reason, it is possible to prevent the stagnation of the carrier flow in the vicinity of the tapered tip, and it is also possible to prevent the stagnation and accumulation of impurities.

  On the other hand, in the configuration of FIG. 6D according to the comparative example, the distal end portion 101 a is substantially at the same position as the inner peripheral surface of the tube 3. For this reason, the leading end 113c is likely to float due to the flow of the transport flow, and if the float occurs, it will cause the transport flow to stay and cause impurities to stay and accumulate.

  Although the present embodiment has been described on the premise of the configuration of the first embodiment using the outer ring 2, the present embodiment may be applied to a configuration that does not use the outer ring 2.

(Embodiment 4)
The fourth embodiment relates to a dimensional relationship between the joint body inner diameter and the outer ring outer diameter. The pipe joint according to the present embodiment satisfies the relationship of the following formula (3).

Formula (3) d3 ≦ d4
d3 is the inner diameter of the mounting portion of the tube assembly 9 among the inner diameters of the joint body 10, and d4 is the outer diameter of the outer ring 2 at a portion corresponding to the inner peripheral surface of the joint body 10 in the tube assembly 9. (FIG. 4A). The difference between d3 and d4 is, for example, 0.5 mm or less. As described with reference to FIG. 2, in the completed state of the tube assembly 9, the tube 3 is press-fitted between the inner ring 1 and the outer ring 2, so that the outer ring 2 presses the tube 3. It will be. If the relationship of the expression (3) is satisfied, the tube assembly 12 is press-fitted into the joint body 13, so that the pressing force of the tube 3 of the outer ring 2 increases and the pressing force is increased by tightening the cap nut 11. Will increase more. For this reason, the fixation of the tube 3 becomes stronger, the pull-out strength of the tube 3 is improved, and the tube 3 becomes more difficult to come out.

(Example)
The effects of the present invention will be specifically described below with reference to examples. As the first example, the pipe joint according to the first embodiment shown in FIG. 5 is used, the pipe joint having the configuration shown in FIG. 8A as the first comparative example, and the second example shown in FIG. Each of the constructed pipe joints was used. The comparative example 1 is a structure which does not provide an outer ring. Although the comparative example 2 is provided with an outer ring in appearance, it has a structure that does not press the tube against the outer ring itself.

  The results of the tensile strength test for each of these pipe joints are shown in Table 1 below. For Example 1 and Comparative Example 1, FIG. 7 shows the relationship between elongation (%) and tensile strength (N). For each pipe joint, tubes of the same material and size (outer diameter 19.05 mm, inner diameter 15.87 mm) were used, and the test conditions (tensile speed 50 mm / min, room temperature 25 ° C.) were also unified. In Table 1, F is the tensile strength (N), which corresponds to the maximum value of the tensile strength in FIG. 7, and from which the tube comes off. ε is the elongation (%).

表１の結果から分るように、実施例１は比較例１、２に比べ、引張強度、伸び率ともに上まわっている。このことは、図７の比較図を見ればより明らかであり、実施例１は比較例１に比べ、特に伸び率が大幅に上回っており、チューブ変形に対して抜けにくい特性であることが分る。

As can be seen from the results in Table 1, both the tensile strength and the elongation rate of Example 1 are higher than those of Comparative Examples 1 and 2. This is more apparent from the comparison diagram of FIG. 7, and it can be seen that Example 1 has a significantly higher elongation rate than Comparative Example 1 and is difficult to escape from tube deformation. The

  As described above, according to the present invention, since the outer annular member presses the tube, the pull-out strength of the tube can be improved, and the construction method can be unified to the room temperature press-fitting method. Further, by satisfying the relationship between the predetermined dimensions and angles, the tube can be reliably pressed and the tube insertion property can be ensured. For this reason, this invention is useful, for example, for resin pipe fittings for semiconductor manufacturing peripheral equipment and resin pipe fittings for piping in chemical industry.

(A) Sectional drawing which shows the state before pressing an outer ring into an inner ring among the joint processes which concern on resin-made pipe joints which concern on one Embodiment of this invention (b) Resin which concerns on one Embodiment of this invention Sectional drawing which shows the state before attaching a tube to an inner ring among the joint processes which concern on a steel pipe joint (A) Cross-sectional view showing the initial state of mounting of a tube in a joint process related to a resin pipe joint according to an embodiment of the present invention. (B) A resin pipe joint according to an embodiment of the present invention. Sectional drawing which shows the state which the tube assembly completed in the joint process which concerns Sectional drawing of the principal part of the pipe joint which concerns on one Embodiment of this invention. (A) Sectional drawing which shows the state before performing the fastening operation | work by a cap nut among the joint processes which concern on the resin-made pipe joints which concern on one Embodiment of this invention (b) The resin-made which concerns on one Embodiment of this invention Sectional drawing which shows the state which the joint work was completed among the joint processes concerning the pipe joint of The expanded sectional view of the principal part of the pipe joint concerning one embodiment of the present invention. (A) Enlarged sectional view of the inner ring tip of the pipe joint according to one embodiment of the present invention (b) Enlarged sectional view of the inner ring tip of the pipe joint according to the comparative example (c) In one embodiment of the present invention (D) Enlarged sectional view of the contact portion between the inner ring of the pipe joint according to the comparative example and the joint body The figure which shows the comparison of the tube pull-out of the pipe joint which concerns on the Example of this invention, and the pipe joint which concerns on a comparative example (A) Main part sectional view concerning an example of a conventional pipe joint (b) Main part sectional view concerning another example of a conventional pipe joint

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Inner ring 1a Tapered part 1b, 10a Chamfer part 2 Outer ring 3 Tube 4 Jig 5,5a Step 6 Tube holder 7 Substantially V-shaped gap 8 Contact part 9 Tube assembly 10 Joint body 11 Cap nut

Claims (7)

A resin pipe joint for connecting a resin tube via a joint body, comprising an inner annular member attached to the joint body, an outer annular member, and a tightening member,
A tube assembly in which the resin tube is mounted on the outer peripheral surface of the inner annular member and the outer annular member is mounted on the outer peripheral surface of the resin tube is formed,
By the action of pressing the resin tube of the outer annular member itself, the outer annular member presses the resin tube against the outer peripheral surface of the inner annular member, and the outer annular member is the resin tube. It is deformed along the shape of the outer peripheral surface of
A resin pipe joint characterized in that, in a state in which the tube assembly is mounted on the inner peripheral surface side of the joint body, a fastening member inserted through the resin tube is fastened to the joint body.   A first step that pawls the outer peripheral surface of the inner annular member when temporarily fixing the outer annular member, and on the side opposite to the inlet side of the resin tube with respect to the first step, The resin pipe joint according to claim 1, wherein a second step for pawling when the outer annular member is finally fixed is formed. Of the outer peripheral surface of the inner annular member, a tapered portion is formed on the inlet side of the resin tube, the outer diameter of which increases toward the rear from the tip.
In a state before the fastening member is inserted into the resin tube, among the inner diameters of the fastening member, the inner diameter of the contact portion to the resin tube is d1, the outer diameter of the resin tube is d2, Of the angles formed by the inclined surface of the tapered portion and the horizontal plane, the acute angle side is α (degrees).
d1 ≦ d2
35 ≦ α ≦ 45
The resin pipe joint according to claim 1, wherein the relationship is satisfied. Of the inner diameter of the joint body, the inner diameter of the mounting portion of the tube assembly is d3, and the outer diameter of the outer annular member of the tube assembly corresponding to the inner peripheral surface of the joint body is d4. ,
d3 ≦ d4
The resin pipe joint according to claim 1, wherein the relationship is satisfied.   Of the outer peripheral surface of the inner annular member, a taper portion whose outer diameter increases toward the rear from the tip is formed on the inlet side of the resin tube, and the tip portion of the taper is chamfered. The resin pipe joint according to claim 1.   The resin pipe joint according to claim 1, wherein a contact portion with an end portion of the inner annular member is chamfered among the inner peripheral surface of the joint body. A resin pipe joint for connecting a resin tube via a joint body, comprising an inner annular member attached to the joint body, and a fastening member,
A tube assembly in which the resin tube is press-fitted is formed on the outer peripheral surface of the inner annular member,
In the state where the tube assembly is mounted on the inner peripheral surface side of the joint body, a fastening member inserted through the resin tube is fastened to the joint body,
Of the outer peripheral surface of the inner annular member, a tapered portion is formed on the inlet side of the resin tube, the outer diameter of which increases toward the rear from the tip.
In a state before the fastening member is inserted into the resin tube, among the inner diameters of the fastening member, the inner diameter of the contact portion to the resin tube is d1, the outer diameter of the resin tube is d2, Of the angles formed by the inclined surface of the tapered portion and the horizontal plane, the acute angle side is α (degrees).
d1 ≦ d2
35 ≦ α ≦ 45
A resin pipe joint characterized by satisfying the relationship

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