JP2007231985A - Piping flange joint - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a piping flange joint capable of manufacturing a flange member by press punching a plate material, capable of reducing a manufacturing cost, and capable of firmly connecting piping in a pipe axial direction in a fixed state. <P>SOLUTION: In the piping flange joint 16 constituted by assembling the piping 20 to the flange member 18, a female serration hole 32 is formed up to a position reaching a plate surface of the flange member 18 on a mating member 10 side, a part positioned in the female serration hole 32 in the state wherein the piping 20 is inserted into a through hole 22 is pressurized and plastically deformed to a radial direction outer side from an inside of the piping 20 by a pressurizing tool, a male serration part 44 imitating the shape of the female serration hole 32 is formed on an outer peripheral surface up to a position reaching the plate surface, and the male serration part 44 is bitten into the female serration hole 32, and the male serration part 44 and the female serration hole 32 are engaged in a pressure contact state. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a pipe flange joint suitable for use in a refrigerant pipe joint of a refrigeration cycle for air conditioning of a vehicle.

Conventionally, for example, as a refrigerant pipe joint of a refrigeration cycle for an air conditioning of a vehicle, a metal pipe is assembled to a plate-like metal flange member, and the flange member is fixed to a mating member with a fixing tool such as a bolt. A pipe flange joint is used in which a boss part of a pipe projecting from the pipe is inserted into an insertion hole of a mating member for connection.
FIG. 5 shows a specific example thereof.

In the figure, reference numeral 200 denotes a mating member to which a pipe 208 is connected, and is provided with an insertion hole 202 for inserting the pipe 208.
A pipe flange joint 204 is constructed by assembling a pipe 208 to a plate-like metal flange member 206.
The flange member 206 is provided with a through hole 210 in the plate thickness direction and a fixed hole 212 that is also penetrated.
The flange member 206 is fixed to the mating member 200 by passing a bolt 214 as a fixture through the fixing hole 212 and screwing the bolt 214 into the female screw hole 216 of the mating member 200.

A part of the through-hole 210 on the side opposite to the mating member 200, that is, a part on the side opposite to the boss 217 of the pipe 208 described later is configured as a circular fitting hole 219, and the intermediate part following this part. Is configured as a female serration hole 218.
Further, a part of the mating member 200, that is, the boss portion 217 side is a large-diameter stepped annular recess 220.

On the other hand, the pipe 208 has a male serration portion 222 corresponding to the female serration hole 218, and the large diameter and circular shape accommodated in the annular recess 220 on the boss portion 217 side following the male serration portion 222. The sandwiched portion 224 is formed.
Here, the sandwiched portion 224 is formed in a form that protrudes in an annular shape along the outer peripheral surface of the pipe 208.
The sandwiched portion 224 also serves as a forming portion of the annular groove 226 for fitting the O-ring 230 as a seal ring. The sandwiched portion 224 and the annular protrusion 228 on the distal end side having a smaller diameter than the sandwiched portion 224 Thus, an annular groove 226 is formed between them, and the O-ring 230 is fitted and held therein.

In the case of the pipe flange joint 204 shown in FIG. 5, the pipe 208 is inserted into the through hole 210 of the flange member 206, the male serration portion 222 of the pipe 208 is engaged with the female serration hole 218 of the through hole 210, and the sandwiched portion. The flange member 206 is pressed against the mating member 200 while the 224 is housed in the annular recess 220, and this is fixed to the mating member 200 with the bolt 214.
At this time, the boss portion 217 protruding from the right plate surface of the flange member 206 of the pipe 208 is inserted into the insertion hole 202 of the mating member 200, and is inserted into the insertion hole 202 by the O-ring 230. It is sealed airtight, and the sandwiched portion 224 is sandwiched between the flange member 206 and the mating member 200 in the tube axis direction of the pipe 208, that is, in the horizontal direction in the drawing, and the sandwiched portion 224 is in the right direction in the drawing. Moreover, it cannot move in the left direction.
That is, the pipe 208 is in a fixed state both in the pushing direction with respect to the mating member 200 and in the pulling direction.

  Further, the pipe 208 is in a state of being stopped by the engagement between the male serration portion 222 and the female serration hole 218 of the flange member 206. That is, the pipe 208 is hermetically connected to the mating member 200 via the flange member 206 in a state where the pipe 208 is stopped.

By the way, in the case of the pipe flange joint 204, the large-diameter sandwiched portion 224 provided in the pipe 208 is brought into contact with the mating member 200, and in this state, the flange member 206 and the mating member 200 are clamped in the pipe axis direction. It is necessary to provide the flange member 206 with an annular recess 220 having a large diameter.
The flange member 206 also needs to be provided with a female serration hole 218 in addition to the annular recess 220, and the female serration hole 218 requires a certain dimension in the tube axis direction. In particular, the plate thickness of the flange member 206 is increased.
As a result, it becomes difficult to manufacture the flange member 206 by punching a plate material. For this reason, conventionally, the flange member 206 is manufactured by cutting a long extruded material into a predetermined plate thickness. There was a problem that the manufacturing cost of the member 206 was increased.

  On the other hand, in Patent Document 1 below, as shown in FIG. 6, a pair of annular protrusions 228 having the same outer diameter are provided in the pipe 208, and an annular groove 226 is formed between them. Separately from 228, a large-diameter and circular sandwiched portion 224 is provided, and this is accommodated in a stepped and large-diameter annular recess 220 of the flange member 206. The sandwiched portion 224 is connected to the flange member 206 and the mating member. A pipe flange joint 204 is disclosed in which the pipe 208 is connected to a mating member so as to be clamped in the pipe axis direction.

  In Patent Document 1, a female serration portion is formed on the inner peripheral wall surface of the annular recess 220, that is, the annular recess 220 is configured as a female serration hole, and the sandwiched portion 224 of the pipe 208 is press-fitted in the axial direction there. Then, a male serration portion corresponding to the female serration hole is formed on the outer peripheral surface of the sandwiched portion 224 by plastic deformation during the press-fitting, and the pipe 208 is connected to the flange member by meshing the male serration portion and the female serration hole. It is also disclosed that the rotation is stopped with respect to 206.

  However, in the one disclosed in Patent Document 1, the male serration portion on the outer peripheral surface of the large-diameter sandwiched portion 224 is simply used to prevent rotation, and the pipe 208 is fixed in the tube axis direction by fixing the sandwiched portion 224 to the flange. This is performed by sandwiching the member 206 and the mating member in the tube axis direction. Therefore, a large-diameter sandwiched portion 224 is provided in the pipe 208 separately from the pair of annular protrusions 228 for forming the annular groove 226. In addition, the flange member 206 must be formed with a large-diameter annular recess 220 and then serrated on the inner peripheral wall surface, which makes the processing cumbersome and increases the processing cost. End up.

JP 2004-36944 A

  In the present invention, the flange member can be manufactured by press punching of a plate material, the manufacturing cost is low, and the pipe is connected to the pipe without providing a large-diameter clamped portion. The object of the present invention is to provide a pipe flange joint that can be firmly fixed in a direction.

  Thus, according to the first aspect of the present invention, a plate-shaped metal flange member is provided with a through-hole in the plate thickness direction, and one side of the through-hole in the plate thickness direction is configured as a female serration hole, The other side is configured as a fitting hole having a smaller diameter than the valley diameter of the female serration hole, which is fitted to the outer peripheral surface of the metal pipe, while the pipe has a pair of annular protrusions at its end. There is provided a boss portion that has an annular groove for fitting a seal ring formed between the portions, protrudes from the plate surface of the flange member on the female serration hole side, and is inserted into the insertion hole of the mating member. In addition, in the pipe flange joint in which a male serration portion is provided at a position corresponding to the female serration hole, and the pipe is assembled to the flange member in a state where the male serration portion is engaged with the female serration hole, the female serration is provided. The female hole is formed to the position reaching the plate surface of the flange member, and the female member has the same outer diameter as the fitting portion of the pipe with the fitting hole in a state where the pipe is inserted into the through hole. A position where the male serration portion following the shape of the female serration hole is formed on the outer peripheral surface by pressing and plastically deforming a portion located in the serration hole radially outward from the inside of the pipe with a pressurizing tool and reaching the plate surface The male serration portion is bitten into the female serration hole, and the male serration portion and the female serration hole are engaged with each other in a pressure contact state.

  According to a second aspect of the present invention, in the first aspect, the difference between the peak diameter of the male serration portion of the pipe and the outer diameter of the fitting portion to the fitting hole is 0.7 mm or less. To do.

  According to a third aspect of the present invention, in any one of the first and second aspects, the pair of annular protrusions are formed on the boss portion that protrudes from the plate surface of the flange member and is inserted into the insertion hole, and The ridge portion diameter of the male serration portion is smaller than the outer diameter of the annular projections, and the surface of the male serration portion on the boss portion side is not a non-contact surface that does not contact the counterpart member. It is characterized by being.

Effects and effects of the invention

  As described above, according to the present invention, a portion located in the female serration hole having the same outer diameter as the fitting portion with the fitting hole in the flange member of the pipe is pressed and radially outward from the pipe with a pressurizing tool. Plastically deformed and formed on the outer peripheral surface a male serration portion following the shape of the female serration hole up to the position reaching the plate surface of the flange member, and the male serration portion bites into the female serration hole, and in a pressure contact state The male serration portion and the female serration hole are engaged with each other. According to the present invention, the shaft is interposed between the pipe and the flange member by biting the pipe into the female serration hole from the inside in the radial direction to the outside. A strong fixing force in the direction can be obtained, and it is not necessary to provide the piping with a large-diameter clamped portion for retaining the piping.

Accordingly, it is unnecessary to form a large-diameter stepped annular recess for accommodating the large-diameter clamped portion in the flange member, and the axial dimension of the female serration hole is secured to a certain level or more. However, the plate thickness of the flange member can be reduced, and the flange member can be manufactured by press punching of the plate material, and the cost for manufacturing the flange member can be reduced.
In addition, since it is not necessary to process and form a large-diameter sandwiched portion in the pipe, the pipe can be easily and inexpensively processed.
Furthermore, since it is possible to eliminate the need to form a large-diameter stepped annular recess in the flange member, the processing cost for processing the part can be reduced.

In the present invention, the difference between the peak diameter of the male serration portion of the pipe and the outer diameter of the fitting portion to the fitting hole can be 0.7 mm or less (claim 2).
In this case, by forming the through hole with the same diameter over the entire length of the flange member in the plate thickness direction, by subjecting the inner peripheral surface of the through hole to serration, a female serration hole can be easily formed. Furthermore, if the male serration portion is simply formed on the outer peripheral surface of the pipe by simply pressurizing the portion having the same outer diameter as the fitting portion into the fitting hole from the inside with a pressure tool in the diameter increasing direction. At the same time, this can be bitten into the female serration hole.

In the present invention, the diameter of the ridge portion of the male serration portion is set to be smaller than the outer diameter of the pair of annular protrusions at the boss portion at the pipe end, and the surface on the boss portion side of the male serration portion is It can be set as the non-contact surface which does not contact | abut to a member (Claim 3).
In the present invention, since the male serration portion bites into the female serration hole to obtain a strong axial fixing force (pull-out force), the male serration portion forming portion of the pipe is brought into contact with the mating member, together with the flange member. Even if it is not made to pinch | interpose this, piping can be stopped well.

In this case, a pair of annular protrusions can be formed on the bosses protruding from the plate surface of the flange member, and the outer diameters of the pair of protrusions can be the same outer diameter.
Moreover, the outer diameter of these annular protrusions can be made larger than the part located in the through-hole of piping.

Next, an embodiment when the present invention is applied to a pipe flange joint as a refrigerant pipe joint for connecting refrigerant pipes of a refrigeration cycle for an air conditioning of a vehicle will be described in detail with reference to the drawings.
In FIG. 1, 10 is a mating member to which a pipe 20 is connected and has a fluid passage 12 and an insertion hole 14 communicating with the fluid passage 12.
Reference numeral 16 denotes a pipe flange joint according to the present embodiment, which is configured by assembling a pipe 20 to a plate-like metal flange member 18.
Here, the thickness T (see FIG. 3) of the flange member 18 is 6 mm.
Incidentally, the flange member 206 shown in FIG. 5 has a plate thickness T of 10 to 12 mm or more.

As shown in FIG. 3, the flange member 18 is provided with a through hole 22 in the plate thickness direction and a fixed hole 24 that is also penetrated.
As shown in FIG. 1, the flange member 18 is fixed to the mating member 10 by passing a bolt 26 as a fixing tool through the fixing hole 24 and screwing it into the female screw hole 28 of the mating member 10.

As shown in FIG. 2, one side of the through hole 22 of the flange member 18 in the plate thickness direction, specifically, the counterpart member 10 side, that is, a part on the opposite side to the boss portion 34 in the pipe 20 described later is circular 3 is configured as a fitting hole 30, and most of the opposite side, that is, the counterpart member 10 side and the boss portion 34 side alternately alternates the crests 32A and troughs 32B shown in FIG. 3 along the circumferential direction. The female serration hole 32 is configured.
Here, the female serration hole 32 is formed up to a position reaching the plate surface on the counterpart member 10 side.

In the present embodiment, the diameter of the crests 32A of the fitting hole 30 and the female serration hole 32 is the same diameter of each as shown in the partial enlarged view of FIG. 2 D _1. Here, D ₁ is set to 12.10 mm.
Diameter of the recess portion 32B in Naomesu serration hole 32 is a _{D 2.} D ₂ is a 12.70mm here.
The valleys 32B in the female serration hole 32 are formed at a total of twelve locations over the entire circumference at a pitch of 30 ° as shown in FIGS.
In addition, an inner surface of the mountain portion 32A between the valley portions 32B and 32B is an arc-shaped surface.

FIG. 2 shows the flange member 18 and the pipe 20 in an assembled state separated from each other. As shown in FIG. 2, the pipe 20 has a boss protruding from the flange member 18 toward the mating member 10 side. A portion 34 is provided.
The boss portion 34 has annular annular protrusions 36 and 38 having an outer diameter D ₃ projecting radially outward, and an annular groove 40 formed therebetween. An O-ring 42 as a seal ring is fitted and held.

As shown in FIG. 1, the boss portion 34 is a portion to be inserted into the insertion hole 14 of the mating member 10, and the boss portion 34 has an O-ring 42 in the insertion hole 14 in the insertion state. The elastic contact is made with the peripheral surface, whereby the space between the mating member 10 and the pipe 20 is hermetically sealed.
The outer diameter _{D 3} of annular projection 36, 38 here is 15.5 mm.

As shown in FIG. 2, the pipe 20 is provided with a male serration portion 44 corresponding to the female serration hole 32 of the flange member 18 following the boss portion 34, specifically the annular protrusion 38.
The male serration portion 44 in the pipe 20 is actually inserted into the through-hole 22 of the flange member 18 with the pipe 20 inserted from the inside of the pipe 20 with a pressurizing tool 46 (see FIG. 4 (II)). Is formed by plastically deforming the outer peripheral surface into a shape following the shape of the female serration hole 32. The male serration portion 44 is formed as shown in FIG. (II) As shown in (B), the valley 44B is pressed against the peak 32A of the female serration hole 32, and the valley 44A completely fills the valley 32B of the female serration hole 32. It bites into 32B, is also in pressure contact with the valley 32B, and meshes with the female serration hole 32 in that state.
Thus the diameter of the valley portion 44B of the male serration portion 44 has the same diameter as the diameter _{D 1} of the peak portion 32A of the female serration hole 32, also the diameter of the crests 44A, the diameter D of the valley portion 32B of the female serration hole 32 ₂ and the same diameter.

FIG. 4 shows a procedure for forming the male serration portion 44 in the pipe 20 and assembling it on the flange member 18 at the same time.
As shown in (I), first, the pipe (element pipe) 20 in which the male serration portion 44 is not formed is inserted into the through hole 22 of the flange member 18.
Here, the pipe 20 has an inner diameter D ₄ and an outer diameter D ₅ , where D ₄ = 9.0 mm and the outer diameter D ₅ = 12.0 mm.
That is, there is a clearance of 0.05 mm between the outer peripheral surface of the pipe 20 and the through hole 22 in the flange member 18, specifically, the fitting hole 30 and the peak portion 32 </ b> A of the female serration hole 32.

Then the inside of the pipe 20, as shown in (II) in this state, a large pressurizing tool of the outer diameter (mandrel) 46 to force pressed in the axial direction than the inner diameter D ₄ of the pipe 20, the pressure The pipe 46 is pressurized from the inside in the radial direction to the outside by the tool 46, and the outer peripheral surface thereof is plastically deformed along the inner peripheral surface of the through hole 22.
Here, the outer diameter D ₆ of the pressurizing tool 46 is set to 9.5 mm, which is 0.5 mm larger than 9.0 mm of the inner diameter D ₄ of the pipe 20.
At this time, the part located in the circular fitting hole 30 in the through hole 22 of the pipe 20 is in a state where the outer peripheral surface is in pressure contact with the fitting hole 30 over the entire circumference due to the diameter expansion, and the pipe 20 is fitted. The hole 30 is in close contact with no gap.

On the other hand, the portion located in the female serration hole 32 is brought into a state in which the outer peripheral surface is in close contact with and in pressure contact with the inner peripheral surface of the female serration hole 32 by the pressurization by the pressurizing tool 46 and the plastic deformation accompanying this, as described above. A part of the female serration hole 32 bites into the valley 32B so as to completely fill the valley 32B.
Here, a male serration portion 44 is formed on the outer peripheral surface of the pipe 20 so as to follow the shape of the female serration hole 32.
The trough 44B of the male serration 44 is in close contact and pressure contact with the inner surface of the peak 32A in the female serration hole 32 as described above.

As shown in FIG. 1, in this embodiment, the large-diameter and annular sandwiched portion 224 as shown in FIGS. 5 and 6 is not formed in the pipe 20, and the pipe 20 has any portion. Also, the flange member 18 and the mating member 10 are not sandwiched in the tube axis direction.
Naturally, the right side of the peak portion 44 </ b> A of the male serration portion 44 in the pipe 20 is not in contact with the mating member 10, and the pressing force by the mating member 10 is not applied to the male serration portion 44.
In spite of this, in this embodiment, the pipe 20 is firmly fixed to the flange member 18 in the pipe axis direction, and therefore any direction in the pipe axis direction (under the connection and assembly state to the mating member 10 ( In the state (right direction and left direction in the figure), it is firmly fixed and cannot move in the removal direction or the reverse insertion direction.

Incidentally, Table 1 shows the contact when the male serration portion 44 is formed by expanding the diameter of the piping 20 under the dimensions of the pipe (element tube) 20, the pressurizing tool 46, the female serration hole 32 in the flange member 18, and the like. In this embodiment, the male serration portion 44 is formed in the pipe 20 as described above, so that the contact area is 228.08 m ² to 231.54 m in the case where there is no serration portion. Increase to ² . The increase rate of the contact area is 1.49%.
Biting possible cross-sectional area of the calculation by the plastic deformation of the pipe 20 with respect to the cross-sectional area 2.88M ² of where the valleys 32B is 5.67m ^2, is excessive in comparison to the cross-sectional area of the valley 32B, the It is considered that the male serration portion 44 of the pipe 20 is formed with a slight diameter expansion of the entire through hole 22 in the minute flange member 18.

According to the present embodiment as described above, a strong fixing force in the axial direction can be obtained between the male serration portion 44 of the pipe 20 and the female serration hole 32 of the flange member 18. It is not necessary to provide the pipe 20 with a large-diameter sandwiched portion (the sandwiched portion 224 shown in FIGS. 5 and 6).
Accordingly, it is unnecessary to form a large-diameter stepped annular recess for accommodating the large-diameter clamped portion in the flange member 18, and the axial dimension of the female serration hole 32 (the above embodiment) In this case, the thickness of the flange member 18 can be reduced while ensuring a certain value of 5 mm or more, which makes it possible to manufacture the flange member 18 by press punching of the plate material. Therefore, the cost can be reduced.
Moreover, since it is possible to eliminate the need to process and form a large-diameter sandwiched portion in the pipe 20, the processing for the pipe 20 can be made simple and inexpensive.
Furthermore, since it is not necessary to form a large-diameter stepped annular recess in the flange member 18, the processing cost for processing the same part can be reduced.

  Although the embodiment of the present invention has been described in detail above, this is merely an example, and the present invention can be configured in various forms without departing from the spirit of the present invention.

It is a figure which shows the piping flange joint of one Embodiment of this invention. It is a figure which isolate | separates and shows the flange member of FIG. 1, piping, and the other member. It is a figure which shows the flange member of FIG. It is a figure which shows the procedure at the time of assembling | attaching piping to a flange member simultaneously with forming a male serration part in piping. It is a figure which shows an example of the conventional piping flange joint. It is a figure which shows the conventional piping flange coupling different from FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Opposing member 14 Insertion hole 16 Piping flange joint 18 Flange member 20 Piping 22 Through hole 30 Fitting hole 32 Female serration hole 32B Valley part 34 Boss part 36,38 Annular protrusion 40 Annular groove 42 O-ring (seal ring)
44 Male serration portion 44A Mountain portion 46 Pressure tool D Diameter of _two valley portions 32B D _Three outer diameters of annular projections 36 and 38

Claims (3)

A plate-shaped metal flange member is provided with a through-hole in the plate thickness direction, and one side of the through-hole in the plate thickness direction is configured as a female serration hole, and the other side is the outer periphery of the metal pipe The pipe is configured as a fitting hole having a diameter smaller than the valley diameter of the female serration hole, while the pipe is fitted with a seal ring formed between a pair of annular protrusions at its end. A position corresponding to the female serration hole, having an annular groove for insertion, protruding from the plate surface of the flange member on the female serration hole side, and being inserted into the insertion hole of the mating member In the pipe flange joint formed by assembling the pipe with the flange member in a state where the male serration part is provided in the male serration part and meshed with the female serration hole,
The female serration hole is formed up to a position reaching the plate surface of the flange member, and the pipe is inserted into the through hole, and has the same outer diameter as the fitting portion of the pipe with the fitting hole. The portion located in the female serration hole is pressed and plastically deformed radially outward from the inside of the pipe with a pressurizing tool, and the male serration portion following the shape of the female serration hole reaches the plate surface on the outer peripheral surface. A pipe flange joint, wherein the male serration portion is bitten into a female serration hole, and the male serration portion and the female serration hole are engaged with each other in a pressure contact state.   2. The pipe flange joint according to claim 1, wherein a difference between a crest diameter of the male serration part of the pipe and an outer diameter of the fitting part to the fitting hole is 0.7 mm or less.   In any one of Claims 1 and 2, the said boss | hub part which protrudes from the plate | board surface of the said flange member and is inserted in the said insertion hole forms the said pair of annular protrusion, and the outer diameter of these annular protrusions The male serration portion has a small ridge diameter, and the boss portion side surface of the male serration portion is a non-contact surface that does not contact the mating member. Piping flange joint.

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