JP2005121171A - Connection structure of tubular member - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To ensure sealing between both tubular members while facilitating forming of the tubular members without inducing increase in components when connecting both the tubular members by interposing a sealing member between the first and second tubular members. <P>SOLUTION: Structure forms on the first tubular member 18 a first diametric expansion 22 and a second diametric expansion 23 with larger diameter than that of the first diametric expansion. It forms a protuberance 30 on the second tubular member 19 and press-fits the sealing member 20 at the protuberance 30 into space S in which the sealing member is arranged. It performs positioning of inserting direction by abutting tip of the second tubular member 19 on a first stage difference part 24 of the first tubular member 18 in such a condition that the second tubular member 19 is inserted into the first tubular member 18. It performs radial positioning of the second tubular member 19 by abutting the protuberance 30 on inner peripheral surface of the second diametric expansion 23. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a connecting structure for tubular members that connects two tubular members in a communicating state.

  Conventionally, as disclosed in Patent Documents 1 and 2, for example, when connecting a first tubular member and a second tubular member, the second tubular member is inserted into the first tubular member, An annular seal member is interposed between the peripheral surface and the outer peripheral surface of the second tubular member to seal between the two tubular members.

  In the connection structure of the tubular member disclosed in Patent Document 1, a sleeve member is provided on the outer side of the second tubular member, and a seal member is externally fitted to the distal end side of the sleeve member of the second tubular member to connect to the first tubular member. At this time, the seal member is press-fitted to a predetermined position by the sleeve member to seal between the first tubular member and the second tubular member.

In the connection structure of the tubular member disclosed in Patent Document 2, a diameter-enlarged portion is formed on the distal end side of the first tubular member, while a projecting portion that projects radially outward is formed on the distal end side of the second tubular member. When connecting the first tubular member and the second tubular member, the second tubular member is inserted into the first tubular member in a state in which the seal member is fitted on the distal end side of the protruding portion of the second tubular member. Like to do. When the second tubular member is inserted, the seal member is press-fitted to a predetermined position by the protruding portion. Further, the protruding portion protrudes outward from the seal member in the radial direction, and the protruding portion abuts on the inner peripheral surface of the enlarged diameter portion of the first tubular member so that the second tubular member is inserted in the insertion direction. Positioning and positioning in the radial direction are performed, whereby the positional relationship between the first tubular member and the second tubular member is appropriately maintained, and the seal can be ensured.
JP-A-5-248572 (second page, FIG. 1) Japanese Patent Laid-Open No. 10-47561 (page 3, FIG. 2, FIG. 3, FIG. 6)

  However, in the connection structure of the tubular member disclosed in Patent Document 1, since the sleeve member for press-fitting the seal member is provided, the number of parts increases correspondingly and the cost increases.

  Moreover, in the connection structure of the tubular member disclosed in Patent Document 2, the second tubular member is positioned in the insertion direction and the radial direction by the protruding portion of the second tubular member. High molding accuracy is required. In addition, since the protrusion is brought into contact with the inner peripheral surface of the enlarged diameter portion of the first tubular member, the second tubular member is positioned in the insertion direction. Must be raised high. That is, since it is necessary to increase the molding accuracy in both the insertion direction and the radial direction of the projection while increasing the projection height of the projection, it is difficult to mold the second tubular member.

  The present invention has been made in view of such a point, and the object of the present invention is to connect both tubular members with a seal member interposed between the first tubular member and the second tubular member. The tubular member can be positioned and the seal member can be press-fitted into a predetermined position without increasing the number of parts and while facilitating the molding of the tubular member, thereby ensuring a seal between the tubular members. It is in.

  In order to achieve the above object, in the present invention, a first enlarged diameter portion and a second enlarged diameter portion larger in diameter than the first enlarged diameter portion are formed on the distal end side of the first tubular member, and the second tubular shape is formed. A protrusion for press-fitting the seal member is formed in the vicinity of the tip of the member, the tip of the second tubular member is brought into contact with the inner peripheral surface of the stepped portion of the first tubular member, and positioning in the insertion direction is performed. Positioning in the radial direction is performed by contacting the inner peripheral surface of the enlarged diameter portion.

  Specifically, the second tubular member is inserted into the first tubular member, and the two tubular members are connected by interposing a seal member between the inner peripheral surface of the first tubular member and the outer peripheral surface of the second tubular member. The connection structure of a tubular member is intended.

  Then, on the distal end side of the first tubular member, a first enlarged diameter portion and a second enlarged diameter portion having a diameter larger than the first enlarged diameter portion are formed in order toward the distal end through stepped portions. On the other hand, in the vicinity of the distal end of the second tubular member, a projecting portion for press-fitting the seal member is formed in the radial direction, the second tubular member is inserted, and both the tubular members are connected, The distal end of the second tubular member abuts on the inner peripheral surface of the stepped portion proximal side of the first expanded diameter portion of the first tubular member to restrict displacement of the second tubular member in the insertion direction, and the second tubular member The protruding portion is in contact with the inner peripheral surface of the second enlarged diameter portion to restrict the radial displacement of the second tubular member.

  According to this configuration, when the second tubular member is inserted into the first tubular member, the seal member is pressed by the protruding portion of the second tubular member, and the inner peripheral surface of the first tubular member and the outer peripheral surface of the second tubular member. Is pressed into a predetermined position. Thereby, it is not necessary to separately provide a member for press-fitting the seal member, and the number of parts is not increased.

  When the second tubular member is inserted, the distal end of the second tubular member abuts on the inner peripheral surface of the stepped portion on the proximal end side of the first tubular member, and the second tubular member is no longer displaced in the insertion direction. , Completely inserted. Further, in a state where the second tubular member is completely inserted, the projecting portion comes into contact with the inner peripheral surface of the second enlarged diameter portion of the first tubular member, and the second tubular member is not displaced in the radial direction. Accordingly, the second tubular member is positioned in the insertion direction and the radial direction with respect to the first tubular member, so that the seal member is kept in close contact with the first tubular member and the second tubular member.

  At this time, since the positioning of the second tubular member in the insertion direction is not performed by the protruding portion, the protruding portion does not need to be protruded radially outward from the sealing member as in the conventional example, and the protruding portion When molding the part, high molding accuracy is not required in the insertion direction. By these things, shaping | molding of a protrusion part becomes easy.

  According to a second aspect of the present invention, in the first aspect of the invention, the outer peripheral surface of the tip of the second tubular member is the inner peripheral surface of the first enlarged diameter portion of the first tubular member in a state of being inserted into the first tubular member. The structure is in contact.

  According to this configuration, when the second tubular member is inserted into the first tubular member, the outer peripheral surface of the distal end of the second tubular member comes into contact with the inner peripheral surface of the first enlarged diameter portion of the first tubular member. The member is supported by the inner peripheral surface of the first tubular member at two locations separated in the center line direction. This prevents each tubular member from being displaced so that the center line of one tubular member is inclined with respect to the center line of the other tubular member, and the seal member is in close contact with the first tubular member and the second tubular member. State is maintained.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, the surface of the protruding portion on the distal end side of the second tubular member is substantially orthogonal to the insertion direction of the second tubular member, and the first tubular member is When inserting the two tubular members, the seal member is brought into contact with the seal member and pressed into the first tubular member.

  According to this configuration, when the second tubular member is inserted into the first tubular member, the seal member is pressed by the surface substantially orthogonal to the insertion direction, so that the seal member is deformed even if the seal member is deformed by the pressing force. Can be reliably press-fitted into a predetermined position.

  According to a fourth aspect of the present invention, in any one of the first to third aspects of the present invention, the seal member is an O-ring, and the seal member includes the inner peripheral surface of the second enlarged diameter portion of the first tubular member and the second surface. The distal end of the projecting portion of the second tubular member is disposed in a radial direction with respect to the center in the radial direction of the seal member in an uncompressed state. The structure is positioned outward.

  According to this configuration, the sealing member strongly adheres to the inner peripheral surface of the second enlarged diameter portion of the first tubular member and the outer peripheral surface of the second tubular member by the repulsive force, and the seal between the two tubular members is further ensured. become. Further, when the second tubular member is inserted into the first tubular member, it is possible to press the protruding portion to a portion outside the center in the radial direction of the seal member, so that the seal member is deformed by the pressing force. However, the seal member does not move over the protrusion and move to the opposite side of the protrusion.

  According to a fifth aspect of the present invention, in any one of the first to fourth aspects of the present invention, the inner circumferential surface of the first tubular member has a sealing member disposed on the inner circumferential surface of the second expanded portion of the first tubular member. Two guide members are provided with a guide surface that increases in diameter toward the distal end side so as to be guided between the outer peripheral surfaces of the tubular members.

  According to this configuration, when the seal member is press-fitted, the seal member is guided in sliding contact with the guide surface, so that the seal member can be easily assembled.

  According to the invention of claim 6, in any one of the inventions of claims 1 to 5, a holding member for holding the connection state between the first tubular member and the second tubular member is provided, and the holding member is the first tubular member. A first locking portion that is formed along the outer peripheral surface of the second diameter-expanded portion and is provided on the first tubular member side of the holding member to be locked to the stepped portion on the distal end side of the second tubular member, The second tubular member is provided with a second locking portion that is locked to the protruding portion of the second tubular member.

  According to this configuration, the holding member is engaged with the step portion of the first tubular member and the protruding portion of the second tubular member, and the connection state of both tubular members is held. Accordingly, the connection state of the first tubular member and the second tubular member can be reliably held without separately providing a locking structure for locking the holding member on the first tubular member and the second tubular member. Become.

  According to a seventh aspect of the present invention, in any one of the first to fifth aspects of the present invention, a caulking portion that is caulked so as to be engaged with the protruding portion of the second tubular member is integrally formed at the distal end portion of the first tubular member. It is set as the structure to form.

  According to this configuration, the second tubular member is inserted into the first tubular member, and the second tubular member is attached to the first tubular member without providing a separate member by caulking the caulking portion and engaging the protruding portion. Holds fully inserted.

  According to the first aspect of the present invention, since the sealing member is press-fitted by the protruding portion of the second tubular member, the sealing member can be press-fitted to a predetermined position without increasing the number of parts, thereby reducing the cost. Can do. Moreover, while making the front-end | tip of a 2nd tubular member contact | abut to the internal peripheral surface of the level | step-difference part of a 1st tubular member, the 2nd tubular member is made to contact | abut the protrusion part of a 2nd tubular member to the internal peripheral surface of a 2nd enlarged diameter part. The member can be positioned in the insertion direction and the radial direction, so that the seal member can be brought into close contact with both tubular members to ensure the seal. In addition, since the protrusion is not positioned in the insertion direction in this way, the protrusion can be made lower than the conventional example, and the molding accuracy in the insertion direction of the protrusion can be reduced. The second tubular member can be easily formed.

  According to the second aspect of the invention, since the outer peripheral surface of the tip end of the second tubular member abuts on the inner peripheral surface of the first tubular member, the second tubular member is separated from the first tubular member at two locations separated in the center line direction. Can be supported on the inner peripheral surface. Thereby, it can prevent that each tubular member displaces so that the centerline of one tubular member may incline with respect to the centerline of the other tubular member, and the seal | sticker between a 1st tubular member and a 2nd tubular member is carried out. It can be made more reliable.

  According to the invention of claim 3, since the seal member can be press-fitted by the surface substantially orthogonal to the insertion direction of the second tubular member, the seal member can be surely press-fitted into a predetermined position.

  According to the fourth aspect of the present invention, the seal member can be tightly brought into close contact with the first tubular member and the second tubular member, and the seal between the two tubular members can be made more reliable. And since it can press by a protrusion part to a part outside the wire radial direction center of a sealing member, a sealing member can be reliably press-fitted in a predetermined position.

  According to the invention of claim 5, when the seal member is press-fitted, the seal member can be guided by the guide surface and can be easily assembled.

  According to invention of Claim 6, even if it does not provide the latching structure which a holding member latches to a 1st tubular member and a 2nd tubular member separately, the connection state of both tubular members can be hold | maintained reliably. Thereby, the structure of a 1st tubular member and a 2nd tubular member can be simplified, and shaping | molding can be performed easily.

  According to the invention of claim 7, since the second tubular member can be held in a state of being completely inserted into the first tubular member without providing a separate member, the connection state of the tubular member is maintained while reducing the number of parts. be able to.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 2 shows a case where the present invention is applied to a tubular member for supplying and discharging a heat exchange medium to and from a heat exchanger 1 such as a heater core of an automotive air conditioner. The heat exchanger 1 includes a core 4 in which flat tubes 2 and corrugated fins 3 extending in the vertical direction are alternately arranged in the left-right direction of the vehicle, and the tubes 2 and fins 3 of the core 4 are arranged in parallel. End plates 5 and 5 for holding the outer end fins 3 and 3 are disposed at both ends in the direction, respectively. These tubes 2, fins 3 and end plates 5 are formed of a so-called clad material in which brazing materials are provided in layers on the surface, and these members 2, 3, 5 are brazed together.

  An upper header tank 7 and a lower header tank (not shown) communicating with the end portions of the tubes 2 are respectively disposed at the upper end portion and the lower end portion of the core 4. Each header tank 7 is formed in a rectangular box shape extending in the juxtaposing direction of the tube 2 and the fin 3, and is divided into a core side member 8 and an anti-core side member 9 formed of a clad material, The core side member 8 and the anti-core side member 9 are brazed. A tube insertion hole (not shown) is formed in the core side member 8 corresponding to the interval between the tubes 2, and the end of the tube 2 projects into the header tank 7. The outer peripheral surface and the periphery of the tube insertion hole are brazed.

  Inside the upper header tank 7, a partition plate 6 is disposed at a substantially central portion in the direction in which the tubes 2 and the fins 3 are juxtaposed. Due to this partition plate 6, the inside of the upper header tank 7 is connected to the first space R1 on the one side in the juxtaposed direction of the tube 2 and the fin 3 (left side in FIGS. 2 to 4) and the other side (right side in FIGS. ) Of the second space R2.

  A first opening 10 that communicates with the first space R1 and a second opening 11 that communicates with the second space R2 are formed on the upper wall of the anti-core side member 9 of the upper header tank 7. The first opening 10 and the second opening 11 are circular, and a supply-side tubular member 15 that supplies a heat exchange medium to the first space R1 is connected to the first opening 10, while A discharge-side tubular member 16 that discharges the heat exchange medium from the second space R2 is connected to the second opening 11. Then, the heat exchange medium that has flowed from the supply-side tubular member 15 into the first space R1 of the upper header tank 7 flows into each tube 2 that communicates with the first space R1, and flows into the lower header tank. Thereafter, the heat exchange medium flowing into the lower header tank flows into each tube 2 communicating with the second space R2 of the upper header tank 7 while flowing in the tube 2 and the fin 3 side by side in the juxtaposed direction. Flows into R2. The heat exchange medium flowing into the second space R2 is discharged from the discharge side tubular member 16 to the outside.

  Since the supply-side tubular member 15 and the discharge-side tubular member 16 are configured in the same manner, the supply-side tubular member 15 will be described in detail below.

  As shown in FIG. 1, the supply-side tubular member 15 includes a first tubular member 18 fixed to the upper header tank 7 and a second tubular member 19 inserted and connected to the first tubular member 18. It is configured. Between the inner peripheral surface of the first tubular member 18 and the outer peripheral surface of the second tubular member 19, a seal member 20 made of an O-ring is disposed in a state compressed in the radial direction.

  As shown also in FIG. 3, the first tubular member 18 is formed in a relatively short cylindrical shape whose center line extends in the vertical direction. A header tank insertion portion 21 to be inserted into the first opening 10 of the upper header tank 7 is formed on the base end side that is the lower end side of the first tubular member 18. The lower end portion of the header tank insertion portion 21 protrudes into the upper header tank 7, and the outer peripheral surface of the header tank insertion portion 21 is brazed to the peripheral edge of the first opening portion 10. One tubular member 18 is fixed to the upper header tank 7.

  The first tubular member 18 is connected to the distal end side, which is the upper side of the first tubular member 18. A second enlarged-diameter portion 23 that is larger than the first enlarged-diameter portion 22 and extends upward is formed. The first enlarged diameter portion 22 and the second enlarged diameter portion 23 each have substantially the same diameter from the upper end to the lower end.

  A first step portion 24 is formed over the entire circumference at the boundary portion between the header tank insertion portion 21 and the first enlarged diameter portion 22 of the first tubular member 18. Further, a similar second step portion 25 is formed above the first step portion 24 of the first tubular member 18 at the boundary portion between the first diameter expanding portion 22 and the second diameter expanding portion 23. . That is, on the upper side of the first tubular member 18, the first enlarged diameter portion 22 and the second enlarged diameter portion 23 are formed in order toward the upper end side via the first stepped portion 24 and the second stepped portion 25. ing.

  Further, the inner peripheral surface on the upper end side of the second diameter-expanded portion 23 is formed in a tapered shape that increases in diameter toward the upper end side, and when the first tubular member 18 and the second tubular member 19 are connected. The guide member 26 guides the seal member 20 between the tubular members 18 and 19. The opening diameter at the upper end of the guide surface 26 is set larger than the outer diameter of the seal member 20 in an uncompressed state before assembly, and the seal member 20 can be easily positioned inside the guide surface 26. It is possible.

  On the other hand, the second tubular member 19 extends in the vertical direction in the same manner as the first tubular member 18, and the outer diameter on the distal end side, which is the lower end side, is the first enlarged portion 22 of the first tubular member 18. The lower end portion of the second tubular member 19 is in contact with the inner peripheral surface of the first step portion 24 of the first tubular member 18. Further, on the outer peripheral surface of the lower end portion of the second tubular member 19, the inner peripheral surface of the first enlarged diameter portion 22 of the first tubular member 18 in a state where the second tubular member 19 is inserted into the first tubular member 18. An abutment surface portion 31 is formed to abut against the. Although not shown, the second tubular member 19 extends from the middle portion to the base end portion, which is the upper end portion, and extends and bends according to the shape of the vehicle body and the position where the heat exchanger 1 is disposed. Yes.

  A projecting portion 30 formed by projecting the peripheral wall radially outward is integrally formed at a portion away from the lower end portion of the second tubular member 19. The projecting portion 30 is formed in an annular shape extending continuously around the entire circumference of the second tubular member 19, and the outer diameter thereof is set to be substantially the same as the inner diameter of the second enlarged diameter portion 23 of the first tubular member 18. . The projecting portion 30 has a substantially rectangular longitudinal section, and the upper surface and the lower surface of the projecting portion 30 are both substantially perpendicular to the center line direction of the second tubular member 19, while the tip surface in the projecting direction is The two tubular members 19 extend substantially parallel to the center line. The distance between the lower end of the second tubular member 19 and the protrusion 30 is such that the second tubular member 19 is inserted into the first tubular member 18, and the lower end of the second tubular member 19 is moved to the first stepped portion. 24, the tip end surface of the projecting portion 30 is set so as to abut on a portion below the guide surface 26 on the inner peripheral surface of the second enlarged diameter portion 23. Further, in this state, the projecting portion 30 is separated upward from the second step portion 25 of the first tubular member 18, and the first tubular member 18 is interposed between the protruding portion 30 and the second step portion 25. A seal member disposition space S sandwiched between the inner peripheral surface and the outer peripheral surface of the second tubular member 19 is formed.

  In addition, a curved surface is formed at the boundary between the lower surface and the front end surface of the protruding portion 30 when the protruding portion 30 is formed. When forming the protruding portion 30, the process is divided into a plurality of steps. The curvature of the curved surface is small.

  When the seal member 20 is not assembled to the first tubular member 18 and the second tubular member 19, as shown in FIG. 5, the seal member 20 is formed to have a substantially circular cross section. In a state where the seal member 20 is externally fitted to the second tubular member 19, the distal end surface of the projecting portion 30 of the second tubular member 19 is positioned on the outer side of the center of the seal member 20 in the radial direction. It has become. On the other hand, the seal member 20 is compressed in the radial direction by the inner peripheral surface of the second enlarged diameter portion 23 and the outer peripheral surface of the second tubular member 19 in the assembled state, and the cross section is tubular as shown in FIG. It becomes an ellipse long in the center line direction of the members 18 and 19.

  Further, in a state where the second tubular member 19 is inserted into the first tubular member 18, a holding member 35 is fitted to the connecting portion of both the tubular members 18, 19, and the second tubular member 19 is The disconnection from the one tubular member 18 is prevented. The holding member 35 includes a cylindrical peripheral wall portion 35a extending in the center line direction of the first tubular member 18 so as to cover the second enlarged diameter portion 23 of the first tubular member 18, and the peripheral wall portion 35a A first locking portion 35b and a second locking portion 35c that are bent radially inward and locked to the first tubular member 18 and the second tubular member 19 are integrally formed at the lower end and the upper end, respectively. . The first locking portion 35b is locked to the outer peripheral surface of the second step portion 25 of the first tubular member 18 from the lower side, and the second locking portion 35c is locked to the protruding portion 30 from the upper surface side. It has become.

  Next, the manufacturing procedure of the heat exchanger 1 configured as described above will be described.

  First, although not shown, the tube 2, the fins 3 and the end plate 5 are arranged to constitute the core 4, and the upper and lower header tanks 7 are assembled to the core 4, and as shown by the arrows in FIG. The first tubular members 18 and 18 on the discharge side are assembled to the first opening 10 and the second opening 11 from above. Then, in this state, the members 2, 3, 5, 7 are integrated so as not to be separated from each other by a jig (not shown), and are carried into the furnace and brazed to the respective parts, whereby the heat shown in FIG. An exchanger 1 is obtained.

  At this time, the supply side tubular member 15 and the discharge side tubular member 16 are divided into a relatively short first tubular member 18 and a long and bent second tubular member 19, and only the first tubular member 18 is divided into the upper header tank. 7 is brazed, the space in the furnace for brazing the heat exchanger 1 is small, and mass productivity is improved.

  After brazing each part, the second tubular member 19 is connected to each first tubular member 18. First, the sealing member 20 is fitted on the lower end side of the protruding portion 30 of the second tubular member 19. Then, the second tubular member 19 is positioned above the first tubular member 18 and the second tubular member 19 is moved downward in a state where the center lines of both the tubular members 18 and 19 are substantially coincided with each other, as shown in FIG. As described above, the lower end portion of the second tubular member 19 is inserted into the second enlarged diameter portion 23 of the first tubular member 18. At this time, the uncompressed seal member 20 is brought into sliding contact with the guide surface 26 of the first tubular member 18 and is guided between the inner peripheral surface of the second enlarged diameter portion 23 and the outer peripheral surface of the second tubular member 19. .

  By moving the second tubular member 18 further downward, the seal member 20 is press-fitted between the inner peripheral surface of the second enlarged diameter portion 23 and the outer peripheral surface of the second tubular member 19 by the lower surface of the protruding portion 30. The At this time, the lower surface of the protrusion 30 is substantially orthogonal to the insertion direction of the second tubular member 19, and the seal member 20 is pressed in the insertion direction. Moreover, since the front end surface of the projecting portion 30 is located outward from the center in the radial direction of the seal member 20 before assembly, the projecting portion 30 extends from the center in the radial direction of the seal member 20 to a portion on the outer side. Pressed. Further, since the curvature of the curved surface formed at the boundary portion between the lower surface and the tip surface of the projecting portion 30 is reduced, the seal member 20 is interposed between the projecting portion 30 and the inner peripheral surface of the second enlarged diameter portion 23. Biting is avoided.

  Then, as shown in FIG. 6, when the lower end portion of the second tubular member 19 comes into contact with the inner peripheral surface of the first step portion 24 of the first tubular member 18, the insertion direction of the second tubular member 19 is further increased. The displacement is restricted, and it is completely inserted. Further, in a state where the second tubular member 19 is completely inserted, the tip surface of the projecting portion 30 abuts on the inner peripheral surface of the second enlarged diameter portion 23 and the abutting surface portion 31 is the first enlarged diameter portion 22. The radial displacement of the second tubular member 19 with respect to the first tubular member 18 is restricted.

  Thereafter, by attaching the holding member 35, the second tubular member 19 is prevented from coming off from the first tubular member 18, and the connected state of both the tubular members 18, 19 is held.

  As described above, according to the tubular member connection structure according to this embodiment, the projecting portion 30 is formed integrally with the second tubular member 19, and the projecting portion 30 allows the seal member 20 to be connected to the second enlarged diameter portion 23. Since it press-fits between an inner peripheral surface and the outer peripheral surface of the 2nd tubular member 19, it is not necessary to separately provide the member for press-fitting the seal member 20, and the number of parts does not increase. Cost can be reduced.

  When the sealing member 20 is press-fitted, the sealing member 20 can be guided by the guide surface 26, so that the sealing member 20 can be easily assembled. In addition, since the seal member 20 is pressed to a portion outside the center in the radial direction by a surface substantially orthogonal to the insertion direction of the second tubular member 19, the seal member 20 is deformed by the pressing force. Also, the seal member 20 can be reliably press-fitted into the seal member disposition space S.

  Further, with the second tubular member 19 inserted into the first tubular member 18, the lower end of the second tubular member 19 is brought into contact with the inner peripheral surface of the first stepped portion 24, and the projecting portion 30 is second Since the second tubular member 19 is positioned in the insertion direction and the radial direction, the seal member 20 is kept in close contact with both the tubular members 18 and 19 because it is brought into contact with the inner peripheral surface of the enlarged diameter portion 23. And a seal between the tubular members 18, 19 can be ensured. Further, since the protrusion 30 is not positioned in the insertion direction as described above, the protrusion 30 can be made lower than that of the conventional example, and the molding accuracy of the protrusion 30 in the insertion direction can be lowered. be able to. Thereby, shaping | molding of the 2nd tubular member 19 which has the protrusion part 30 can be performed easily.

  In the state where the second tubular member 19 is inserted, the contact surface portion 31 of the second tubular member 19 is in contact with the inner peripheral surface of the first enlarged diameter portion 22, and the second tubular member 19 is in the direction of the center line. The two center points are separated from each other by the inner peripheral surface of the first tubular member 18, so that the center line of the first tubular member 18 is not displaced so as to be inclined with respect to the center line of the second tubular member 19. . Further, since the seal member 20 is compressed and assembled, the repulsive force strongly adheres to the inner peripheral surface of the second enlarged diameter portion 23 and the outer peripheral surface of the second tubular member 19. By these things, the seal between the 1st tubular member 18 and the 2nd tubular member 19 can be made more reliable.

  Further, in a state where the first tubular member 18 and the second tubular member 19 are connected, the first locking portion 35b of the holding member 35 is locked to the second step portion 25, and the second locking portion 35c protrudes. The connection state of both tubular members 18 and 19 can be maintained by engaging the portion 30. Thereby, it is not necessary to separately provide a locking structure with the holding member 35 in the first tubular member 18 and the second tubular member 19, the shapes of both the tubular members 18, 19 can be simplified, and molding is further facilitated. can do.

  In this embodiment, the first tubular member 18 and the second tubular member 19 are coupled by a separate holding member 35. For example, as in the modification shown in FIG. The tubular members 18 and 19 may be joined by caulking the caulking portion 18 a formed integrally with the member 18 to the protruding portion 30 of the second tubular member 19. The caulking portion 18a is formed in a piece shape protruding upward from the upper end of the first tubular member 18, and after the second tubular member 19 is completely inserted, the caulking portion 18a is bent inward in the radial direction. 30 is engaged with the upper surface. Thereby, since the 2nd tubular member 19 can be held in the state inserted completely in the 1st tubular member 18 without providing holding member 35, the connection state of both tubular members 18 and 19 is reduced, reducing the number of parts. Can keep.

  Further, the present invention can be applied to the case where two tubular members are connected in addition to the tubular members 15 and 16 of the heat exchanger 1.

  As described above, the tubular member connection structure according to the present invention can be used, for example, when a tubular member for supplying and discharging a heat exchange medium is connected to a heat exchanger.

It is sectional drawing which shows the connection structure of a 1st tubular member and a 2nd tubular member. It is a front view which shows the upper half part of a heat exchanger. FIG. 3 is a view corresponding to FIG. 2 for explaining assembly of the first tubular member. FIG. 3 is a view corresponding to FIG. 2 and showing a state before the second tubular member is connected. It is sectional drawing which shows the state which inserted the 1st tubular member in the 2nd tubular member to the middle. FIG. 6 is a view corresponding to FIG. 5 showing a state in which the first tubular member is completely inserted into the second tubular member. FIG. 8 is a view corresponding to FIG.

Explanation of symbols

18 1st tubular member 18a Caulking part 19 2nd tubular member 20 Seal member 22 1st enlarged diameter part 23 2nd enlarged diameter part 24 1st level difference part 25 2nd level difference part 26 Guide surface 30 Protrusion part 35 Holding member 35b 1st Locking portion 35c Second locking portion

Claims (7)

Connecting a tubular member that inserts a second tubular member into the first tubular member and connects both tubular members with a seal member interposed between the inner peripheral surface of the first tubular member and the outer peripheral surface of the second tubular member. Structure,
On the distal end side of the first tubular member, a first expanded diameter portion and a second expanded diameter portion larger in diameter than the first expanded diameter portion are formed in order toward the distal end through stepped portions, respectively.
On the other hand, in the vicinity of the distal end of the second tubular member, a protruding portion for press-fitting the seal member is formed to project in the radial direction,
With the second tubular member inserted and the two tubular members connected, the distal end of the second tubular member abuts against the inner peripheral surface of the stepped portion on the proximal end side of the first tubular member, and the second tubular member is inserted. The displacement in the direction is restricted, and the protruding portion of the second tubular member abuts on the inner peripheral surface of the second enlarged diameter portion to restrict the displacement in the radial direction of the second tubular member. A tubular member connection structure. In the connection structure of the tubular member according to claim 1,
The tubular member connection structure, wherein the outer peripheral surface of the distal end of the second tubular member is in contact with the inner peripheral surface of the first enlarged diameter portion of the first tubular member in a state of being inserted into the first tubular member. . In the connection structure of the tubular member according to claim 1 or 2,
The surface of the protruding portion on the distal end side of the second tubular member is substantially orthogonal to the insertion direction of the second tubular member, and abuts against the seal member when the second tubular member is inserted into the first tubular member. A connecting structure for tubular members, wherein the members are press-fitted into the first tubular member. In the connection structure of the tubular member according to any one of claims 1 to 3,
The seal member is an O-ring,
The seal member is interposed between both surfaces in a state of being compressed in the radial direction between the inner peripheral surface of the second enlarged diameter portion of the first tubular member and the outer peripheral surface of the second tubular member,
The connecting structure for tubular members, wherein the tip of the protruding portion of the second tubular member is positioned radially outward from the center in the radial direction of the seal member in an uncompressed state. In the connection structure of the tubular member according to any one of claims 1 to 4,
On the inner peripheral surface of the first tubular member, the diameter of the seal member increases toward the distal end so as to guide the seal member between the inner peripheral surface of the second enlarged diameter portion of the first tubular member and the outer peripheral surface of the second tubular member. A connecting structure for tubular members, characterized in that a guide surface is provided. In the connection structure of the tubular member according to any one of claims 1 to 5,
A holding member for holding a connection state between the first tubular member and the second tubular member is provided,
The holding member is formed along the outer peripheral surface of the second enlarged-diameter portion of the first tubular member, and the holding member is engaged with the stepped portion on the distal end side of the first tubular member on the first tubular member side. A connecting structure for tubular members, wherein a first locking portion is provided, and a second locking portion for locking to the protruding portion of the second tubular member is provided on the second tubular member side. In the connection structure of the tubular member according to any one of claims 1 to 5,
A connecting structure for tubular members, characterized in that a caulking portion that is caulked so as to be engaged with a protruding portion of the second tubular member is integrally formed at a distal end portion of the first tubular member.

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