JP2009127809A - Pipe joint part structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To allow easy pipe connecting work by preventing the fall-off of a seal ring when inserting the seal ring into a seal cap. <P>SOLUTION: The seal cap 10 and the seal ring 15 are laid between a first joint member 1 and a second joint member 5. At one end of the seal cap 10, seal ring engaging pawl pieces 12 to be stoppers when inserting the seal ring 15 are formed opposing one another at four places. At positions opposite to the seal ring engaging pawl pieces 12 along the axial direction, fall-off preventing pawl pieces 14 are formed opposing each other at two places. A recessed groove in a grooved shape is formed in the fall-off preventing pawl piece 14 formed on the inner peripheral face side of the seal cap 10 at a position opposite to the outer peripheral face of the seal cap 10 so that the position of a pipe fixing pawl or the fall-off preventing pawl piece 14 after pipe assembly is checked to be a mounting/demounting mark. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

The present invention relates to a pipe joint structure when a CFC substitute refrigerant is used with CO ₂ .

In recent years, due to global warming, next-generation refrigerants, such as carbon dioxide (CO ₂ ) and similar gases, have been considered as refrigerants in the refrigeration cycle, instead of CFCs. In the refrigeration cycle using these next-generation refrigerants, the refrigeration cycle is operated with the pressure in the high pressure part exceeding the critical pressure of the refrigerant, and the solubility is high for polymer materials such as rubber. It was. For this reason, when a seal member such as an O-ring is used in the pipe joint portion, it has been a problem that the refrigerant passes through the seal member and leaks to the outside. In order to solve this problem, conventionally, countermeasures for preventing the release of the refrigerant into the atmosphere have been studied for the next-generation refrigerant having a feature of high permeability. For example, Patent Document 1 discloses a configuration in which _two seal members, an O-ring and a backup ring, are used to prevent CO ₂ from passing through the seal member and leaking outside. Although Patent Document 1 exhibits an excellent effect in preventing leakage of refrigerant to the outside, the seal member is originally vulnerable to heat and has a problem in durability at high temperatures. Therefore, a pipe joint structure using an aluminum seal ring and a resin seal cap as shown in Patent Document 2 has been provided.

According to this, as shown in FIGS. 9 to 10, a cylindrical protective socket (seal cap) 22 and a sealing ring inserted into the protective socket 22 between a pair of joint blocks 21, 21 connected to one end of a piping member. A (seal ring) 23 is interposed. The protective socket 22 is formed with a flange-like sealing lip 22a projecting outward, and the sealing ring 23 is configured to be fitted in a gap space formed between the pair of joint blocks 21 and 21 in a sealed state. It was.
JP 2006-348998 A Japanese Patent No. 3936697

  However, in the piping joint structure of Patent Document 2, when the pair of joint blocks 21 and 21 are connected, the protective socket 22 into which the sealing ring 23 is inserted is connected, so that the sealing ring 23 is dropped from the protective socket. As a result, there is a risk that a simple operation mistake of forgetting to insert the sealing ring 23 may occur. In order to connect the pair of joint blocks 21 and 21 so as not to drop off the sealing ring 23, it takes time to perform the work.

The present invention solves the above-described problems, and when connecting a pair of piping members with a seal cap for preventing refrigerant leakage interposed, the connection work can be performed in a short time without dropping the internal seal ring. It aims at providing the piping joint part structure which can be performed. Therefore, the pipe joint part structure according to the present invention is configured as follows. That is,
In the first aspect of the invention, the first pipe member is connected to one end and the first joint member having a male part at the other end is connected to the second pipe member at one end and the male part is connected to the other end. A second joint member having a female portion facing each other, wherein the first joint member and the second joint member are arranged to prevent leakage of refrigerant flowing through the inside to the outside. A pipe joint structure connected via a seal cap and a seal ring, wherein the seal cap is formed in a cylindrical shape that can be attached to the male part and accommodates the seal ring therein, and the seal cap Is provided with drop-off prevention means for preventing the seal ring from dropping from the seal cap.

  According to a second aspect of the present invention, the drop-off prevention means is disposed on the opposite side of the seal ring engagement claw piece with the seal ring engagement claw piece formed at one end of the seal cap between the seal ring. The seal ring is formed so as to be able to be clamped by a drop-off preventing claw piece provided.

  According to a third aspect of the present invention, mark means for detaching the seal cap from the first joint member is formed on the outer peripheral surface of the seal cap.

  The invention according to claim 4 is characterized in that the mark means is a concave groove formed in an outer peripheral surface of the seal cap.

  The invention according to claim 5 is characterized in that the seal cap is formed of a resin material, and the seal ring is formed to be detachable from the seal cap by pressing the concave groove.

  According to a sixth aspect of the present invention, the clearance between the inner diameter of the female portion of the second joint member and the outer diameter of the seal cap is between the engaging portion of the pipe fixing claw formed on the seal cap and the male portion. It is characterized by being set smaller than the catching allowance with the formed engaging portion.

  The invention according to claim 7 is a seal cap that is sandwiched between two joint members and holds a seal ring that seals between the joint members, the cap body portion formed in a cylindrical shape, At one end of the inner peripheral surface of the cap main body portion, a seal ring engaging claw piece provided to protrude radially inward, and at a position facing the radial direction in the middle of the inner peripheral surface of the cap main body portion, Two caps that are provided so as to protrude inward in the direction, and the cap body portion passes between the caps and is provided between the caps and the seal ring engaging tabs. In order to allow the seal ring to be detached, it is configured to be elastically deformable in the radial direction so as to allow expansion of the radial spacing of the drop-off preventing claw piece.

  The invention according to claim 8 is characterized in that it is provided on the outside of the cap main body part so as to be visible, and has a mark part corresponding to the drop-off preventing claw piece in a radial direction or provided at a position orthogonal thereto. Yes.

  According to the ninth aspect of the present invention, two pipe fixings are provided that protrude radially inward and engage with the joint member at a position facing the radial direction of the other end of the inner peripheral surface of the cap main body. It is a nail | claw, Comprising: The radial direction space | interval expands by the elastic deformation of the said cap main-body part, It is characterized by including the 2 piping fixing nail | claw which accept | permits the removal | desorption to the said coupling member.

  The invention according to claim 10 is characterized in that the drop-off preventing claw piece and the pipe fixing claw are provided at complementary positions in the circumferential direction.

  According to the pipe joint part structure of the present invention, the drop prevention means provided in the seal cap can hold the seal ring by inserting the seal ring into the seal cap. Therefore, since the first joint member and the second joint member can be connected in a state where the seal ring is housed in the seal cap, an easy connection operation can be performed in a short time.

  In one form of this drop-off prevention means, when the seal ring is inserted into the seal cap, one end surface of the seal ring is engaged with the seal ring engaging claw piece of the seal cap, and the other end surface of the seal ring is engaged with the seal cap. Engage with the drop-off prevention claw piece. Since the seal ring engaging claw piece and the drop-off preventing claw piece of the seal cap are formed so as to be able to sandwich the seal ring, the seal ring can be held without dropping off the seal cap.

  In addition, this seal cap is formed of a resin material and an outer peripheral surface of the seal cap is formed with a concave groove as a mark means for detaching the seal cap from the first joint member. By pressing the vicinity of the concave groove, the seal cap is deformed, and the pipe fixing claw of the seal cap can be released from the engaging portion of the male member. Therefore, the seal cap can be detached from the male part of the first joint member.

  Moreover, when removing a 1st coupling member and a 2nd coupling member, a seal cap moves along the female part internal peripheral surface of a 2nd coupling member. In this case, the clearance between the outer diameter of the seal cap and the inner diameter of the female portion of the second joint member is caught between the engaging portion of the pipe fixing claw formed on the seal cap and the engaging portion formed on the male portion. Since the seal cap is set smaller than that, the first joint member and the second joint member can be removed while the seal cap is mounted on the male part of the first joint member.

  Moreover, according to the seal cap of this invention arrange | positioned in a piping joint part structure, the seal cap is formed so that the seal ring which seals between two joint members can be hold | maintained. The seal ring is held between a seal ring engagement claw piece provided on one end side of the inner peripheral surface of the seal cap and a drop-off prevention claw piece provided to face the seal ring engagement claw piece. The seal cap is configured to be elastically deformable to allow expansion of the radial interval for passing the seal ring between the seal ring engagement claw piece and the drop-off prevention claw piece, so that the seal ring can be inserted with one touch. In addition, the seal ring inserted in the seal cap can be prevented from falling off.

  Furthermore, in order to confirm the position of the drop-off preventing claw piece formed on the inner peripheral surface of the seal cap of the present invention, a mark portion is formed on the outer peripheral surface so as to be visible. By manipulating a portion orthogonal to the mark portion, the seal cap and the first joint member can be immediately separated or the seal ring and the seal cap can be separated immediately.

  Further, the seal cap of the present invention is provided with two pipe fixing claws opposed in the radial direction at the other end portion of the inner peripheral surface so as to be able to engage with the joint member. Since this pipe fixing claw can expand the radial interval by elastic deformation of the cap body part, the seal cap can be attached to and detached from the cap body part with one touch.

  Further, since the drop-off preventing claw piece and the pipe fixing claw are in a complementary positional relationship, the seal ring and the seal cap are separated from each other, and the first joint member and the seal cap are separated at the same time instead of simultaneously. be able to.

  Next, one form of the piping joint part structure of this invention is demonstrated based on drawing.

  FIG. 1 is an exploded cross-sectional view showing a pipe joint structure of an embodiment, and FIG. 2 is an assembled cross-sectional view. The pipe joint structure of the embodiment shown in FIGS. 1 and 2 includes a first joint member 1 that connects a pipe member (not shown) to one end, a second joint member 5 that connects a pipe member (not shown) to one end, and a resin. A seal cap 10 made of metal and a seal ring 15 are provided.

  The first joint member 1 is formed with a cylindrical male portion 2 projecting toward the second joint member 5 side, and a flow path 3 is formed therein. A pipe port 4 into which one end of a pipe member (not shown) is inserted is formed on the surface of the first joint member 1 opposite to the male part 2. At the tip of the male part 2, an umbrella-shaped engaging part 2b that spreads outward in the radial direction is provided at the tip. Further, a ring-shaped protrusion 2a that has a pointed shape in the axial direction is provided at the tip of the male part 2. It is formed to protrude toward the second joint member 5 side. The protrusion 2 a is formed so as to press the one end surface of the seal ring 15 and bite into the end surface of the seal ring 15. Further, the first joint member 1 is formed with a bolt insertion hole 1 a for fastening with the second joint member 5.

  Further, an O-ring 16 is attached to the small diameter portion 2c connected to the engaging portion 2b of the male portion 2. The O-ring 16 is arranged to prevent moisture and muddy water from entering the seal cap 10 or the seal ring 15 from the outside, and prevents the seal ring 15 from corroding and generating rust.

  The second joint member 5 has a female part (hereinafter referred to as a recess) 6 into which the male part 2 of the first joint member 1 is inserted, and a flow path 7 is formed inside. A pipe port 8 into which one end of a pipe member (not shown) is inserted is formed on the surface of the second joint member 5 opposite to the recess 6. An annular raised portion is provided on the bottom surface of the recess 6 so as to surround the open end of the flow path 7, and a ring-shaped protrusion 6 a that is pointed in the axial direction is provided on the tip surface of the recess 6. It protrudes toward the surface. The protrusion 6 a is formed so as to press the other end surface of the seal ring 15 and bite into the other end surface of the seal ring 15. The second joint member 5 is formed with a female screw 5a facing the bolt insertion hole 1a of the first joint member 5. The bolt insertion hole 1a and the female screw 5a can be interchanged.

  The difference between the inner diameter of the recess 6 and the outer diameter of the seal cap 10 is set so that the seal cap 10 remains in the male part 2 when the joint member 1 and the joint member 5 are pulled apart. Specifically, as shown in FIG. 3, the clearance (clearance) H between the inner surface of the recess 6 and the outer surface of the seal cap 10 is such that the engagement surface 13 a of the pipe fixing claw 13 and the engagement portion of the male part 2. The diameter of each part is set so as not to be larger than the catching margin L between 2b. This relationship is maintained even when the seal cap 10 is located in the recessed portion 6 so as to be maximally biased. As a result, even in the configuration in which the pipe fixing claw 13 is formed only in a part of the seal cap 10 in the circumferential direction, the seal cap 10 is not detached from the male part 2 while being located in the recess 6. For example, the O-ring 16 may be rubbed between the outer surface of the male part 2 and the inner surface of the recess 6 to push the seal cap 10, or the outer surface of the seal cap 10 and the inner surface of the recess 6 may be strongly rubbed in part. Even if it exists, since the seal cap 10 keeps engaging with the male part 2, it is prevented that the seal cap 10 is left in the recessed part 6 at the time of decomposition | disassembly.

  The seal cap 10 is formed of an elastically deformable thermoplastic resin such as polypropylene, polyoxymethylene, polyamide, polybutylene terephthalate, or those containing a reinforcing agent such as glass fiber or talc. As shown in FIGS. 4 to 6, the seal cap 10 has a cap body portion 11 formed in a cylindrical shape. The seal cap 10 is formed with a plurality (four in the illustrated example) of seal ring engagement claw pieces 12 (see FIG. 4) protruding radially inward from one end of the cap body 11. ing. An engagement surface 12 a (see FIG. 5) that engages with one end surface of the seal ring 15 is formed on the back surface side of the seal ring engagement claw piece 12.

  On the inner surface of the cap main body 11, the pipe fixing claws 13 that engage with the engaging portions 2 b of the male portion 2 are radially positioned at positions slightly closer to the other end than the center and facing inward. It is formed to protrude inward. The back surface side of the pipe fixing claw 13 is formed as an engagement surface 13a (see FIG. 5).

  Moreover, as shown in FIG. 6, the drop-off preventing claw pieces 14 that engage with the other end surface of the seal ring 15 at positions complementary to the plurality of seal ring engagement claw pieces 12 of the cap body portion 11 are opposed to each other at two locations. Is formed. A surface of the drop-off preventing claw piece 14 facing the seal ring 15 is formed as an engaging surface 14a. Furthermore, a concave groove 11a is formed in a groove shape from the end surface on the outer peripheral surface of the cap main body portion 11 at a circumferential position corresponding to the drop-off preventing claw piece 14 so that the seal cap 10 can be detached from the pipe fixing claw 13. It is formed as a landmark.

  The seal ring 15 is formed in an annular shape having one surface that can be engaged with the seal ring engagement claw piece 12 of the seal cap 10. In addition, on both sides, it is made of a material having softness so as to bite into the protrusion 2a and the protrusion 6a, for example, aluminum or copper.

  The inner diameter of the cap main body 11 formed in a cylindrical shape is slightly larger than the outer diameter of the seal ring 15.

  The plurality of seal ring engagement claws 12 are provided on the inner peripheral surface of the cap main body portion 11 at regular intervals. One end surface of the seal ring engaging claw piece 12 has an inclined surface. The surface (back surface) facing the inner side of the seal ring engaging claw piece 12 provides a flat surface along the end surface of the seal ring 15. Each seal ring engagement claw piece 12 extends in an arc shape. The length of each seal ring engagement claw piece 12 in the circumferential direction is narrower than the distance between two adjacent seal ring engagement claw pieces 12. Even when the cap main body 11 is deformed into an elliptical shape along the radial direction in a state where the seal ring 15 is accommodated, the minimum circle defined by the radial inner end of the seal ring engaging claw piece 12 is The outer diameter of the seal ring 15 is never larger. On the other hand, when the cap main body 11 is deformed into an elliptical shape along the radial direction in a state where the seal ring 15 is accommodated, the maximum circle defined at the radial tip of the seal ring engaging claw piece 12 is It may be larger than the outer diameter of the seal ring 15. Instead of the four seal ring engagement claws 12, two seal ring engagement claws 12 extending over the two seal ring engagement claws 12 of this embodiment may be adopted. Moreover, you may employ | adopt the seal ring engagement claw piece 12 extended over the perimeter.

  The plurality of pipe fixing claws 13 are provided at equal intervals on the inner peripheral surface of the cap body 11. The pipe fixing claw 13 has a slope that gently extends radially inward from the other end of the cap body 11. The pipe fixing claw 13 has a flat surface along the radial direction in order to engage with the engaging portion 2b. This plane faces toward one end side of the cap main body 11. Each pipe fixing claw 13 extends in an arc shape. The circumferential length of each pipe fixing claw 13 is substantially equal to the distance between the two seal ring engaging claw pieces 12. The plurality of pipe fixing claws 13 have such dimensions that the seal ring 15 can be inserted into the cap body 11 from the pipe fixing claw 13 side. In this embodiment, the seal ring 15 can be inserted into the cap body 11 while the radial height and the interval between the plurality of pipe fixing claws 13 allow a slight deformation in the cap body 11. Yes.

  The plurality of drop-off preventing claw pieces 14 are provided on the inner peripheral surface of the cap main body portion 11 at regular intervals. The drop-off preventing claw piece 14 has a slope that gently extends radially inward from the other end side of the cap body 11. The drop-off preventing claw piece 14 has a flat surface 14 a along the radial direction in order to engage with the other end surface of the seal ring 15. Each drop-off preventing claw piece 14 extends in an arc shape. The length in the circumferential direction of each drop-off preventing claw piece 14 is sufficiently smaller than the distance between the two seal ring engaging claw pieces 12. When the seal ring 15 is inserted from the other end side of the cap main body part 11, the plurality of drop prevention claw pieces 14 allow the cap body part 11 to be slightly deformed while the seal ring 15 does not fall off. So that it can be inserted between the drop-off preventing claw piece 14 and the seal ring engaging claw piece 12. In this embodiment, only two drop-off preventing claw pieces 14 are provided opposite to each other in the radial direction, so that the seal ring 15 can be inserted under deformation of the cap main body portion 11 in the same radial direction. Yes.

  On the inner surface of the cap body 11, at least a part of the seal ring engagement claw piece 12 is positioned between the plurality of drop-off prevention claw pieces 14 in the circumferential direction. In the embodiment using a plurality of seal ring engagement claw pieces 12, it can be said that the drop prevention claw pieces 14 and the seal ring engagement claw pieces 12 are provided at positions complementary to each other in the circumferential direction. In the embodiment, the seal ring engagement claw piece 12 is disposed at a position that is not overlapped with the circumferential range in which the drop-off prevention claw piece 14 is provided. As a result, when the radial interval between the drop-off preventing claw pieces 14 arranged opposite to each other is widened, the radial interval between the seal ring engaging claw pieces 12 arranged opposite to each other is reduced. In this embodiment, two seal ring engagement claw pieces 12 are positioned between the two drop prevention claw pieces 14. Further, one pipe fixing claw 13 is positioned between the two dropout prevention claw pieces 14. The plurality of drop prevention claw pieces 14 and the plurality of pipe fixing claws 13 are positioned at positions complementary to each other in the circumferential direction. Further, the pipe fixing claw 13 is also positioned to face the radial direction. The radial direction in which the drop-off prevention claw piece 14 is provided and the radial direction in which the pipe fixing claw 13 is provided are orthogonal to each other. The concave groove 11a as the mark portion is provided at a position corresponding to the drop-off preventing claw piece 14 or the pipe fixing claw 13.

  As described above, this embodiment includes the seal ring 15 that is sandwiched between two joint members and seals between the joint members. The seal cap 10 that holds the seal ring 15 includes a cap body 11 formed in a cylindrical shape, and seal ring engagement claws provided at one end of the inner peripheral surface of the cap body 11 so as to protrude radially inward. A piece 12, a seal ring engaging claw piece 12 provided so as to protrude from the inner peripheral surface of the cap main body 11, and a position protruding radially in the middle of the inner peripheral surface of the cap main body 11. Two drop-off prevention pieces 14 provided. In addition, the cap main body 11 is provided with a drop-off prevention claw piece in order to allow the seal ring 15 to be detached between the drop-off prevention claw piece 14 and the seal ring engagement claw piece 12 through the drop-off prevention claw piece 14. It is configured to be elastically deformable in the radial direction so as to allow expansion of 14 radial intervals. Furthermore, it is provided on the outer side of the cap main body 11 so as to be visible, and includes a mark portion 14a corresponding to the drop-off joint claw piece 14 in the radial direction or provided at a position orthogonal thereto. Furthermore, two pipe fixing claws 13 are provided protruding inward in the radial direction at positions opposed to the radial direction of the other end portion of the inner peripheral surface of the cap main body part 11 and engageable with the joint member, A radial interval is expanded by elastic deformation of the main body 11, and two pipe fixing claws 13 that allow attachment to and removal from the joint member are provided. Further, the drop-off preventing claw 14 and the pipe fixing claw 13 are provided at complementary positions in the circumferential direction.

  Next, the effect | action of the piping joint part structure comprised as mentioned above is demonstrated.

  As shown in FIG. 1, a male part 2 of a first joint member 1 having a pipe member connected to one end and a concave part 6 of a second joint member 5 having a pipe member connected to one end are arranged to face each other. . The seal ring 15 is inserted into the seal cap 10 and the seal cap 10 is attached to the male part 2 of the first joint member 1. When the seal ring 15 is inserted into the seal cap 10, the seal ring 15 is inserted from the first joint member 1 side of the seal cap 10. The drop-off preventing claw piece 14 formed on the seal cap 10 has an inclined surface that gradually narrows in the radial direction with respect to the insertion direction of the seal ring 15. Therefore, when the seal ring 15 is pushed in, the drop-off preventing claw piece 14 and the cap main body 11 are deformed and can be easily fitted.

  One surface of the seal ring 15 is engaged with the engagement surface 12 a of the seal ring engagement claw piece 12, and the other surface is engaged with the engagement surface 14 a of the drop-off prevention claw piece 14 and accommodated in the seal cap 10. Is done.

  When mounting the seal cap 10 toward the male part 2 of the first joint member 1, the pipe fixing claw 13 of the seal cap 10 is deformed by the male part 2 of the first joint member 1. The pipe fixing claw 13 of the seal cap 10 is engaged with the engaging portion 2 b of the first joint member 1, and the end surface of the seal ring 15 is a protrusion formed at the tip of the male portion 2 of the first joint member 1. 2a.

  Next, the first joint member 1 equipped with the seal cap 10 is inserted into the second joint member 5. At this time, when the seal cap 10 attached to the male portion 2 of the first joint member 1 is inserted into the recess 6 of the second joint member 5 and the end surface of the seal cap 1 reaches the bottom surface of the recess 6, The end surface of the seal ring 15 is positioned on the protrusion 6 a formed on the bottom surface of the recess 6 of the second joint member 5. Then, the first joint member 1 and the second joint member 5 are fastened with bolts. At this time, the protrusion 2a and the protrusion 6b bite into both end faces of the seal ring 15, respectively. Thus, the first joint member 1 and the second joint member 5 are connected while being sealed by the seal ring 15.

  For example, when the seal cap 10 and the seal ring 15 are replaced, after the first joint member 1 and the second joint member 5 are separated, the seal cap 10 is moved to the male part 2 of the first joint member 1. Separate from. At the time of such desorption, the seal cap 10 and the male part 2 of the first joint member 1 are engaged by the pipe fixing claws 13 formed at two opposing positions. As shown, the seal cap 10 can be easily attached and detached if the seal cap 10 is deformed by pressing the outer peripheral surface in the direction in which the pipe fixing claws 13 of the seal cap 10 are expanded. In this case, the direction of expanding the pipe fixing claws 13 to each other is that the groove-shaped concave groove 11a formed on the outer peripheral surface of the seal cap 10 is a mark, so that the circumference of the concave groove 11a is pushed from both sides. Become.

  Further, when the seal ring 15 and the seal cap 10 are detached, as shown in FIG. 8, the seal cap 10 is deformed in the direction in which the drop-off preventing claw pieces 14 of the seal cap 10 formed at two places are spread. Desorb by. In this case, the portion orthogonal to the two concave grooves 11a facing each other is pressed, or the outer peripheral surface of the seal cap 10 is pressed after visually confirming the engagement state between the seal cap 10 and the seal ring 15. To do.

  As described above, in the pipe joint structure according to the embodiment, when the seal ring 15 is mounted on the seal cap 10, the drop-off preventing claw piece 14 is formed on the seal cap 10, and thus the seal ring 15 mounted on the seal cap 10. Can be prevented from falling off. Therefore, the operation | work at the time of connecting the 1st coupling member 1 and the 2nd coupling member 5 can be performed easily.

  Further, when the seal cap 10 is detached from the male part 2 of the first joint member 1, the seal cap 10 is formed with the concave groove 11a formed on the outer peripheral surface of the seal cap 10 as a mark. The engaging claw piece 14 of the seal cap 10 can be easily detached from the engaging portion 2b of the male part 2 by pushing around 11a, and when the seal ring 15 is detached from the seal cap 10, the groove 11a The seal cap 10 and the seal ring 15 can be easily detached by pushing a portion in the orthogonal direction.

  In addition, the piping joint part structure of this invention is not limited to the above-mentioned form. For example, the concave groove 11a formed on the outer peripheral surface of the cap main body 11 of the seal ring 10 is the end surface on the opposite side of the seal cap 10 in FIG. 5, that is, the end surface of the seal cap 10 on the seal ring engaging claw piece 12 side. May be formed in a groove shape, or may be formed not in the end face but in the central portion in the axial direction. Furthermore, instead of the concave groove 11a, a hole may be formed in the end surface of the cap main body 11 or an identifiable seal may be attached.

It is an exploded front sectional view of a pipe joint part structure showing one form of the present invention. FIG. FIG. 3 is a partially enlarged view showing a fitting state between a seal cap and a recess in FIG. 2. It is a side view which shows the seal cap of the piping joint part structure in FIG. It is VV sectional drawing in FIG. It is VI-VI sectional drawing in FIG. It is a side view which shows the state deform | transformed so that the piping fixing claw of a seal cap might be expanded. It is a side view which shows the state deform | transformed so that the drop-off prevention claw piece of a seal cap might be expanded. It is a partial cross section figure which shows the conventional piping joint part structure. It is a perspective view which shows the conventional seal cap.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 1st coupling member 2, male part 2a, protrusion 2b, engaging part 5, 2nd coupling member 6, recessed part 6a, protrusion 10, seal cap 11, cap main-body part 11a, recessed groove 12, seal ring engagement Joint claw piece 12a, engagement surface 13, pipe fixing claw 13a, engagement surface 14, drop-off prevention claw piece 14a, engagement surface

Claims (10)

A first pipe member (1) having a first pipe member connected at one end and a male part (2) at the other end and a second pipe member connected at one end and facing the male part at the other end A second joint member (5) having a female part (6), wherein the first joint member (1) and the second joint member (5) are connected to the outside of the refrigerant flowing inside. A pipe joint structure connected via a seal cap (10) and a seal ring (15) arranged to prevent leakage,
The seal cap (10) is formed in a cylindrical shape that can be attached to the male part (2), and has a drop prevention means for preventing the seal ring (15) from dropping from the seal cap (10). A pipe joint structure characterized by being arranged.   The drop prevention means includes a seal ring engaging claw piece (12) formed at one end of the seal cap (10), and the seal ring engaging claw piece (12) with the seal ring (15) in between. The pipe joint part structure according to claim 1, wherein the seal ring (15) is formed so as to be sandwiched between a drop-off preventing claw piece (14) disposed on the opposite side.   Marking means for detaching the seal cap (10) from the first joint member (1) is formed on the outer peripheral surface of the seal cap (10). The pipe joint structure described.   The pipe joint part structure according to claim 3, wherein the marking means is a concave groove (11a) formed on an outer peripheral surface of the seal cap.   The seal cap (10) is made of a resin material, and the seal ring (15) is detachable from the seal cap (10) by pressing the concave groove (11a). The pipe joint part structure according to claim 4, wherein   The clearance between the inner diameter of the female portion (6) of the second joint member and the outer diameter of the seal cap (10) is such that the engagement portion of the pipe fixing claw (13) formed on the seal cap (10) The pipe joint part structure according to claim 1, 2, 3, 4 or 5, wherein the pipe joint part structure is set to be smaller than a catch allowance with an engaging part formed on the male part (2). A seal cap that is sandwiched between two joint members and holds a seal ring that seals between the joint members;
A cap body (11) formed in a cylindrical shape;
A seal ring engaging claw piece (12) provided at one end of the inner peripheral surface of the cap main body (11) so as to protrude radially inward;
Two caps (14) for preventing dropouts (14) provided projecting inward in the radial direction at positions facing the radial direction in the middle of the inner peripheral surface of the cap body (11),
The cap main body (11) detaches the seal ring between the drop prevention claw piece (14) and the seal ring engagement claw piece (12) through the gap between the drop prevention claw pieces (14). Therefore, the seal cap is configured to be elastically deformable with respect to the radial direction so as to allow expansion of the radial gap of the drop-off preventing claw piece (14).   A mark portion (11a) provided on the outside of the cap main body portion so as to be visible and corresponding to the detachment preventing claw piece (14) in a radial direction or at a position orthogonal thereto is provided. Item 8. The seal cap according to Item 7.   Two pipe fixing claws (13) provided to project radially inwardly at a position facing the radial direction of the other end portion of the inner peripheral surface of the cap main body portion and engageable with the joint member, The seal according to claim 7 or 8, further comprising two pipe fixing claws (13) whose radial interval is expanded by elastic deformation of the cap main body (11) and which allows attachment / detachment to the joint member. cap. The seal cap according to claim 9, wherein the drop-off preventing claw piece (14) and the pipe fixing claw (13) are provided at complementary positions in the circumferential direction.

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