JP4840689B2 - Joint structure of metal flexible hose and joint fitting used therefor - Google Patents

Description

  The present invention relates to a joint structure of a metal flexible hose and a joint fitting used therefor, and more particularly to a joint structure of a metal flexible hose in which a connecting portion between a metal flexible pipe and a joint fitting used therefor and a joint fitting used therefor are improved.

  As a conduit for fluids such as liquid and gas, corrugated stainless steel pipes are known. Displacement is good and easy to install. Connection with other pipe members and connections between pipe members are short. It is widely used due to the advantage that it can be easily done in time. When connecting the metal flexible hose, it is usually connected to another pipe member via a joint member which is a metal fitting. Conventionally, regarding the joint structure of a metal flexible hose, for example, those shown in Patent Documents 1 and 2 have been proposed.

Japanese Utility Model Publication No. 4-82484 JP 2005-325933 A

  In the thing of patent document 1, an exterior blade is fitted on the outer surface of the extending end of the metal flexible tube, a sleeve is interposed between the metal flexible tube and the exterior blade, and the extended end of the metal flexible tube The insertion tube portion of the nipple is inserted into the portion, the socket disposed on the outer peripheral surface of the exterior blade is compressed, and the exterior blade, the sleeve, and the metal flexible tube are pressure-bonded to the insertion tube portion of the nipple. In the joint portion, a seal member is shown interposed between the insertion tube portion of the nipple and the metal flexible tube. In the structure of the joint portion of the metal flexible tube disclosed in Patent Document 1, the insertion tube portion of the nipple is inserted inside the metal flexible tube to form an overlapping portion with the metal flexible tube. There is a problem that the inner diameter of the metal fitting as a nipple is smaller than the inner diameter, and the resistance when flowing a fluid is increased. In the joint part structure of this document, a sleeve is externally mounted on the outer surface of the portion where the end portion of the flexible tube is straightened, and further, a blade and a socket are attached from the outer surface and fixed by crimping. The sleeve 3 for functioning the caulking and fixing is necessary, and there are problems that the number of parts is large, the parts management is complicated, the number of processes is long, the assembling time is long, and the working efficiency is inferior. Furthermore, in the structure of this document 1, since the sealing material 5 is sandwiched between the insertion tube portion of the nipple and the metal flexible tube and crimped together from the outer surface side of the metal flexible tube, the seal member is excessively deformed. As a result, the deterioration of the seal member is accelerated.

  Moreover, in the thing of patent document 2, the press nut 3 in which a metal tube is inserted, and the base ring 10 inserted between a metal tube end part and a braid | blade are comprised, and the press nut 3 has the taper surface 5 at the edge part. The base ring 10 has an inclined receiving surface corresponding to the tapered surface at the end, and the braid is fixed with a strong pressure between the tapered surface and the inclined receiving surface as the holding nut 3 is tightened to the connecting part 4. The end structure of the flexible metal hose that is made possible is shown. However, in the terminal structure of the flexible metal hose of Patent Document 2, in order to hold the O-ring between the flange of the end of the metal tube and the wall of the connecting pipe that abuts against the metal tube, The deformation amount of the O-ring fluctuates depending on the shape of the cut end of the flange at the end of the tube. For this reason, there is a problem that the durability of the O-ring and thus its sealing performance varies, and it is difficult to ensure a stable sealing performance. It was. Further, the presser nut 3, the base ring 10, the sliding ring 14, and the presser ring 15 are required, which increases the number of parts and increases the cost. In addition, as in Reference 1, there is a problem that parts management is complicated, there are many assembly processes, and the assembly work time is long.

  The present invention has been made in view of the above-described conventional problems, and one object thereof is to reduce the flow path resistance in the hose, to reduce the flow resistance in the hose, to achieve a simple structure and at a low cost, and in a short time, the flexible metal hose. It is another object of the present invention to provide a joint structure of a metal flexible hose capable of connecting the joint portions of the joint and a joint fitting used therefor. Another object of the present invention is to provide a metal flexible hose joint structure capable of maintaining a stable sealing function over a long period of time while maintaining a stable deformation amount of the seal member, and a joint fitting used therefor.

In order to achieve the above object, the present invention is a joint structure of a metal flexible hose 12 by connecting a metal flexible pipe 14 and a joint fitting 16, and is an outer periphery of the metal flexible pipe 14 and the metal flexible pipe 14. A seal member 18 composed of one or a plurality of O-rings 181 disposed on the outer periphery near the connection end with the joint metal fitting 16 and disposed between the troughs 3 of the metal flexible pipe; a pressure pipe portion 20 that is crimped is fitted into a metal flexible tube 14 so as to cover the seal member 18 are integrally connected, pressure pipe so as not seal member 18 is excessively deformed during crimping of the pressure tube portions It is comprised from the joint structure of the metal flexible hose characterized by including the circumferential recessed parts 241 and 248 formed in the internal diameter side of the part 20. FIG. The joint structure of the present invention has a configuration in which a pressure-welded pipe portion formed by integral connection of a joint fitting is fitted on the outside of a metal flexible pipe and crimped, and the flow resistance in the hose can be reduced. Further, the operation for the connection can be performed in a short time by simply inserting the metal flexible pipe with the seal member attached to the inner diameter side of the pressure contact pipe and externally crimping. The blade may be attached to the outer surface side of the metal flexible tube. At that time, it is preferable to fix the end of the blade to the joint fitting by caulking with a fixing fitting, welding or other methods. As the seal member, an elastic seal member is preferable. Among them, a rubber member having high durability and little deterioration is preferably used. However, an elastic body other than the rubber member may be used. Sealing member 18, by such consisting of one or more O-ring 181 is disposed so as stops between Hidatani third metal flexible tube 14, fitting the like inlet portion of Hidatani metal flexible tube The positioning can be performed reliably and stopped. Further, the inner diameter side of the pressure tube 20, by the circumferential recess 241 is formed so as not to unduly deforming the sealing member 18 during crimping of the pressure tube portions, to protect the sealing member such as rubber member , Durability can be maintained.

At that time, the press-connecting pipe portion 20 may include a circumferential convex portion 242 that fits into a portion of the trough 3 between adjacent ridges 2 of the metal flexible pipe 14 when caulking from the outside. The position at the time of caulking is set reliably, and the caulking force is stably received to contribute to the management of the caulking amount. Moreover, the convex part 242 fulfill | performs the hooking function which prevents that the metal flexible tube 14 slips out.

Furthermore, it is preferable that the connecting portion between the press-connecting pipe portion 20 and the joint fitting 16 is formed of a thin-walled portion 26 that is plastically deformed to the inner diameter side when caulking from the outside with respect to the press-connecting pipe portion that is caulked from above the seal member. .

  Further, the blade 30 and a ring 32 for crimping the blade 30 may be externally mounted on the outer side of the press-contact pipe portion 20, and the blade 30 and the press-contact pipe portion 20 may be fixed by caulking together.

Further, the present invention is a joint structure of the metal flexible hose 12 by connecting the metal flexible tube 14 and the joint metal fitting 16, and is an outer periphery of the metal flexible tube 14 and the metal flexible tube 14, and is connected to the joint metal fitting 16. A seal member 18 including one or a plurality of O-rings 181 disposed on the outer periphery near the end portion and disposed so as to stop between the troughs 3 of the metal flexible tube, and the seal member 18 integrally connected to the joint fitting 16. A pressure-welded tube portion 20 that is externally fitted to the metal flexible tube 14 so as to cover the metal, and is crimped to the metal flexible tube 14 in the portion of the valley 3 where the O-ring 181 stops. It is comprised from the joint structure of the metal flexible hose which provided the pressure release hole 28 connected to the P side.

Further, the present invention is a joint structure of the metal flexible hose 12 by connecting the metal flexible tube 14 and the joint metal fitting 16, and is an outer periphery of the metal flexible tube 14 and the metal flexible tube 14, and is connected to the joint metal fitting 16. A seal member 18 including one or a plurality of O-rings 181 disposed on the outer periphery near the end portion and disposed so as to stop between the troughs 3 of the metal flexible tube, and the seal member 18 integrally connected to the joint fitting 16. A pressure-welded tube portion 20 that is externally fitted to the metal flexible tube 14 so as to cover the metal, and is crimped to the metal flexible tube 14 in the portion of the valley 3 where the O-ring 181 stops. It is comprised from the joint structure of the metal flexible hose which provided the pressure release groove | channel 29 connected to P side.

  Moreover, this invention is comprised from the coupling metal fitting used for the joint structure of one of said metal flexible hoses.

  According to the joint structure of the metal flexible hose of the present invention, it is a joint structure of the metal flexible hose by connecting the metal flexible pipe and the joint metal fitting, and the metal flexible pipe and the metal flexible pipe, which are connected to the joint metal fitting. A seal member disposed on the outer periphery near the end, and a press-contact tube portion that is integrally connected to the fitting and is fitted on the metal flexible tube so as to cover the seal member. Therefore, the configuration is such that the pressure-welded tube portion and the metal flexible tube are sealed via the seal member, so the configuration is very simple, and only the metal flexible tube, the seal member, and the joint fitting are required, and the number of parts is reduced. A very low cost and low cost joint structure can be realized. At the same time, the pressure welded pipe part is integrally fitted on the outside of the metal flexible pipe and crimped. As a result, the metal flexible hose is connected to the joint without narrowing the inner diameter side of the metal flexible pipe and increasing the flow resistance. Can be made. Further, the connection work can be performed in a short time.

The sealing member, since a structure comprising one or more O-ring is arranged so as to stop during crimping of the pressure tube portions with folds valley metal flexible pipes, the positioning of the seal member such as an O-ring To ensure durability and prevent over-deformation.

  In addition, the inner diameter side of the pressure-welded tube portion maintains a stable deformation amount of the seal member by forming a circumferential recess so as not to deform the seal member excessively when the pressure-welded tube portion is caulked. Thus, a reliable sealing function can be maintained for a long time.

  In addition, since the press-connecting pipe part is formed with a circumferential convex part that fits into a trough portion between adjacent ridges of the metal flexible pipe when caulking from the outside, the metal flexible part of the press-connecting pipe part is formed. As a result of holding the contact position on the pipe constant and ensuring the contact positioning, the seal member can be positioned on the metal flexible pipe and the amount of caulking can be managed reliably. Furthermore, when the convex part 242 enters the valley part, it becomes an effective hook for preventing the metal flexible pipe from coming out of the fitting, and the metal flexible pipe can be prevented from coming off with a small caulking force. Further, when an internal pressure is applied, a force to expand the metal flexible tube 14 to the outside acts, so that it becomes difficult for the metal flexible tube to get out of this catch, and the pressure resistance performance can be maintained reliably.

  Since the connecting part between the press-connecting pipe part and the joint fitting includes a thin part that plastically deforms to the inner diameter side when caulking from the outside, the press-welding during caulking of the press-connecting pipe part integrally connected to the joint metal fitting is performed. It is possible to maintain the tightening state with certainty and to maintain the effectiveness for simplifying the configuration.

  In addition, a blade and a ring that crimps the blade are externally attached to the outer side of the pressure welding tube, and the blade and the pressure fitting are crimped and fixed together. It is possible to reduce the number of points, reduce the cost, eliminate the influence on the channel resistance, and shorten the connection work time.

  In addition, by adopting a configuration in which a pressure relief hole is provided in the Sugaya portion where the O-ring stops, when the large pressure (internal pressure) is applied from the flow path side of the metal flexible tube, the O-ring It is possible to prevent deterioration of the sealing performance due to being depressed toward the bottom side of the Sugaya.

  Moreover, it is a metal flexible pipe | tube, Comprising: It is set as the structure which formed the pressure release groove | channel connected to the flow path side of a metal flexible pipe in the Sugaya part where an O-ring stops, A big pressure (internal pressure) from the flow path side of a metal flexible pipe When the O-ring is added, it is possible to prevent deterioration of the sealing performance due to the O-ring being pressed toward the bottom of the Sugaya bottom and sinking.

Further, the joint fitting used in the joint structure according to any one of claims 1 to 6 can realize a joint structure having the above-described effects.

  The best mode for carrying out the present invention will be described below with reference to the accompanying drawings. 1 to 4 show a joint structure of a metal flexible hose according to a first embodiment of the present invention. In FIG. 1, the metal flexible hose 12 includes a metal flexible tube 14, and the joint structure 10 of the metal flexible hose 12 is obtained by connecting at least the metal flexible tube 14 and the joint fitting 16.

  In the present embodiment, the joint structure 10 of the metal flexible hose is integrally connected to the metal flexible tube 14, the seal member 18 disposed on the outer periphery of the metal flexible tube, and the joint fitting 16 so as to cover the seal member 18. And a press-contact pipe portion 20 fitted on the metal flexible pipe.

  In the present embodiment, the metal flexible tube 14 is made of a metal corrugate tube that is formed by corrugating a thin-walled stainless tube, for example, and forming a ridge in which the crests 2 and the troughs 3 are alternately repeated. The hollow portion inside the metal flexible tube 14 forms a flow path P through which fluid such as water, other liquids, and gas flows. The flow path P inside the metal flexible tube 14 and the outside are blocked from watertight or airtight so that the fluid flowing through the inside does not leak to the outside. The metal flexible tube 14 has a displacement absorption property including expansion and contraction and flexibility, and further functions as a fluid transport tube that absorbs temperature expansion and vibration and has durability.

  In FIG. 1, a sealing member 18 is sheathed at the end of the left metal flexible tube 14, inserted into the inner diameter portion of the pressure welding pipe portion 20 of the right fitting 16, and crimped from the outside of the pressure welding pipe portion 20. As a result, the flexible hose and the fitting are joined together.

  In the present embodiment, the joint fitting 16 has a circumferential tool abutment surface 221 in the middle of the main body 22, has a press-connecting pipe part 20 for fitting the metal flexible pipe 14 at one end, and has a male screw part 222 at the other end. It consists of a deformed nipple tube member having a straight axis.

  The pressure welding pipe part 20 is a pipe part that is integrally connected to the main body 22 of the joint fitting 16 and extends to the metal flexible pipe side, and the metal flexible pipe is fitted and inserted into the inner diameter side of the pressure welding pipe part 20. That is, the press-contact pipe portion 20 is a fixing means that is integrally connected to the joint fitting and is fitted on the metal flexible pipe 14 so as to cover a seal member 18 described later. In this embodiment, at the same time, the metal It also seals between flexible pipes and fittings. This press-connecting pipe part 20 is a part for directly connecting the metal flexible pipe 14 and the joint fitting 16 by caulking and pressing from the outer surface after receiving the metal flexible pipe 14 on the inner side. Parts such as a fixing ring are not required.

  In FIG. 2, the press-contact pipe portion 20 includes a caulking portion 24 and a thin portion 26. The thin-walled portion 26 is provided at a directly connecting portion where the main body 22 and the press-connecting tube portion 20 of the joint metal fitting 16 are integrally connected. When the pressurizing portion 24 is pressurized from the outside, the thin-walled portion 26 is plastically deformed. This is a part for connecting and fixing the metal fitting 16 and the metal flexible tube 14, and when the plastic deformation is caused by external pressure, the extension side is bent toward the inner diameter side as shown in FIG. maintain. The thin portion 26 has a thickness of about 1 millimeter, for example, and extends from the main body 22 in a straight tube shape in the axial direction of the tube. And the caulking part 24 is expanded from the front-end | tip part to the step shape, and is connected.

In FIG. 1 and FIG. 2, the press-connecting tube portion 20 includes a concave portion 241 and a convex portion 242 formed circumferentially on the inner diameter side thereof. In the present embodiment, the concave portion 241 is a portion that houses the seal member so that the seal member 18 is not excessively deformed when the pressure contact tube portion 20 is caulked. In this embodiment, the longitudinal direction of the pressure contact tube portion 20 in a cross-sectional view. With respect to the direction (longitudinal direction of the metal flexible tube), it has a holding portion 241a that is formed in a substantially arc shape and receives and holds the seal member 18. The shape of the concave portion 241 is not particularly limited, but preferably, the two inclined surfaces have the same angle so that the concave mountain formed by the concave formation forms a symmetrical gradient as shown in FIGS. It is good to be provided with Φ1 (FIG. 2) . Pressure pipe portion base end side of the recess 241, the pressing wall 2 34 facing the tube axis direction so as to be connected to the lower surface of the thin portion 26 is formed, a metal flexible tube 14 on the inner diameter side of the pressure tube portions The ridge 2A at the extreme end is inserted and locked.

Further, in the present embodiment, a convex portion 242 is formed adjacent to the concave portion 241 and continuously. The convex portion 242 is a portion that fits into the ridge 3 portion between the adjacent ridges 2 of the metal flexible tube 14 when caulking from the outside of the caulking portion 24. In the present embodiment, for example, the concave portion 241 is formed. The inwardly projecting side 241b of the wall surface simultaneously forms a convex part 242, and this convex part 242 is formed as a gentle convex part so as to form an inward mountain part of about 130 degrees. Therefore, as shown in FIG. 4, when crimping is performed from the outside of the crimping portion 24, both oblique lines 242 a of the convex portion 242 come into contact with the inlet portion of the valley 3 with a substantially equal balance. The shape of the convex portion 242 is not particularly limited, but preferably, as shown in FIGS. 2 and 4, the two inclined surfaces have the same angle so that the convexly formed peaks form a symmetrical gradient. It is good to be provided with Φ2 (FIG. 2) .

  Further, in FIGS. 1 to 4, a seal member 18 is provided so as to be fitted to the outer periphery of the metal flexible tube 14 inside the press-contact tube portion 20. The sealing member 18 is an airtight (including watertight) coupling means for maintaining and connecting the metal flexible tube 14 and the fitting 16 and is not particularly limited in shape and material. In the present embodiment, nitrile rubber or the like is used. An O-ring (O-ring) 181 made of an elastic member having a circular cross section is used. In the embodiment, the O-ring 181 is an outer periphery near the connection end of the joint metal fitting 16 and the metal flexible tube 14, more specifically, a flange between the peak 2A at the extreme end and the second peak 2B adjacent thereto. It attaches so that it may lightly hit with the equal force to the entrance part of trough 3A (endmost part Sugaya), and after caulking of caulking part 24, as shown in Drawing 4, holding part 241a of crevice 241 and Sugaya 3A The two flexible pipes 14 and the joint fitting 16 are kept airtight by being in close contact with both inlet portions in a state of being slightly crushed by the same force. Therefore, for the airtight connection between them, it is only necessary to insert the metal flexible tube 14 equipped with an O-ring into the inner diameter portion of the press-connecting tube portion 20 and press-contact it from the outer surface side of the press-connecting tube portion. It is possible to achieve low-cost and short-time connection without the need for metal fittings to be fixed.

  In particular, the O-ring 181 as a seal member is disposed so as to stop between the ridges 3A of the metal flexible tube 14 when the press-connecting tube portion 20 is caulked, so that the metal flexible tube 14 and the fitting 16 are securely sealed. Hold. That is, in this embodiment, only one O-ring 181 is arranged corresponding to the valley 3A, but two or more O-rings 181 are arranged side by side in the adjacent valley 3 to accommodate them. You may implement as a big recessed part 241 structure. Also in this case, as described above, the concave portion 241 is set to a size that does not excessively deform the seal member 18 when the press-connecting tube portion 20 is caulked.

  Further, as shown in FIGS. 2 and 4, a pressure release hole (pressure release passage) 28 is formed in the valley portion 3 where the O-ring 181 of the metal flexible tube stops. When a large pressure (internal pressure) is applied from the flow path side of the metal flexible tube, the pressure release hole 28 can prevent deterioration of the sealing performance due to the O-ring being pressed and sinking to the bottom side of the Sugaya.

  As shown in FIGS. 5 and 6, instead of the above-described pressure release hole 28, a pressure release groove (pressure release) that communicates with the flow path P side of the metal flexible tube 14 at the portion of the valley 3 </ b> A where the O-ring 181 stops. (Passage) 29 may be formed.

In order to obtain the joint structure of the metal flexible hose of the present embodiment, first, the inlet portion of the Sugaya 3A between the peak 2A at the end of the metal flexible tube 14 and the second peak 2B next to it. Attach the O-ring 181 to the. At that time, the O-ring 181 is attached so as to be lightly hit with an equal force to the entrance portion of the Kakutani 3A. Then, the end portion side of the metal flexible tube 14 is inserted into the inner diameter hole of the press-connecting tube portion 20, and the tip of the metal flexible tube 14 is brought into contact with the pressing wall 234 to be locked (see FIG. 2). Next, it crimps from the outer surface of the caulking part 24 with a caulking tool from the circumferential direction. At this time, as shown in FIG. 4, the thin-walled portion 26 of the press-connecting tube portion 20 is plastically deformed in a bent shape toward the inner diameter center side. Then, as shown in FIG. 3, the press-connecting pipe part 20 is externally fixed in a state of being pressed and in close contact with the outer surface of the metal flexible pipe, and the inner diameter side flow path P of the metal flexible pipe 14 is not deformed. It is possible to prevent the channel resistance from being affected without narrowing. As a result, the O-ring 181 held by the holding portion 241a of the concave portion of the pressure-welded tube portion and pressed toward the inner diameter side of the tube is slightly crushed and the cross-section is slightly deformed into an elliptical shape without being excessively deformed. As a result, the O-ring 181 is in close contact with the inner diameter wall of the press-fit tube portion of the joint fitting, and is slightly crushed and held in a state where it hits the inlet portion of the trough 3A at a slightly lower position on both sides. As described above, the O-ring is restrained from three directions by the both inlet portions of the Shibuya inlet of the metal flexible pipe and the upper joint fitting (inner diameter part of the pressure welding pipe part), and is housed in the recess 241. The positional relationship in which the convex portion 242 of the press-welding pipe portion 20 fits into the recessed portion of Shibuya and the press-welding pipe portion (joint fitting) contacts the outer surface of the metal flexible pipe is inevitably determined. Therefore, it is easy to properly control the initial deformation amount of the O-ring and the positioning with respect to the joint fitting. As a result, the route from the flow path P side of the metal flexible tube 14 to the outside air by the path T is completely blocked and sealed. At the time of press-contact of the caulking portion 24, the convex portion 242 hits the entrance portion of the valley portion 3 between the second end and the third peak portion with almost equal force, and the press-contact force is determined with the contact position determined. Receiving it securely, the O-ring 181 is crushed with an appropriate caulking force to ensure a seal.

  In addition, the recessed part 241 inside the press-connecting pipe part 20 of the above-described embodiment is intended to prevent the seal member 18 from being excessively deformed when the press-connecting pipe part is caulked. As good as For example, FIG. 7 is configured as a concave portion 248 having a straight shape in the tube axis direction, not a concave portion having a circular arc shape as in the above-described embodiment, and the sealing member is held by the straight holding portion 248a. The same effect as described above can also be achieved by holding the seal member with a linear arc surface in the axial direction while holding it. Moreover, it is good also as another arbitrary recessed part structure.

  Next, a second embodiment of the present invention will be described with reference to FIGS. In addition to the structure of the first embodiment, the joint structure of the metal flexible hose of the second embodiment includes a blade 30 externally mounted on the outer surface of the metal flexible pipe 14 and a portion attached to the outer surface of the press-contact pipe portion. The fixing ring 32 is further externally mounted on the outer surface of the blade, and in this state, the fixing ring 32 is pressed from the outer surface and crimped together. The first structure except that the blade 30 and the fixing ring 32 are provided. The configuration is the same as that of the embodiment.

  In the metal flexible hose joint structure 10b of the second embodiment, the metal flexible pipe 14 can be protected by the metal blade 30, the strength can be reinforced, and the durability of the entire hose can be increased. The blade 30 is formed of, for example, a blade unit made of a tape-like stainless steel plate or a blade unit in which wire strands are arranged and connected in a hollow cylindrical shape. When the pressure is applied from the inside while maintaining the stretchability and deformability of the inner metal flexible tube, it is possible to protect the uneven portion from extending. Then, a fixing ring 32 is inserted into the outer surface of the pressure-welded pipe portion attached to the blade, and the whole is fixed by caulking from the outer surface. When caulking, the thin-walled portion 26 of the pressure-welded tube portion is bent and plastically deformed, and the O-ring 181 is pressed to maintain the sealed state. In the metal flexible hose joint structure 10b according to the second embodiment, since the metal flexible hose having high strength is used by the blade 30, almost any application point for fluid conveyance can be put into practical use.

  10 and 11, in the configuration of the second embodiment described above, the cap nut 34 is screwed and connected to the other end side of the joint fitting 16 with respect to the metal flexible pipe connection (the joint fitting portion on the side opposite to the press-contact pipe portion 20). In this example, a joint fitting having an arbitrary configuration can be applied to the other end side of the joint fitting 16 with respect to the metal flexible pipe connection. In FIGS. 10 and 11, the joint fitting may be used as it is depending on the place of application, or may be applied by connecting another pipe member instead of the cap nut as necessary.

  Further, FIGS. 12 and 13 show that the structure of the concave portion 241 of the pressure contact pipe portion in the second embodiment is not a cross-sectional arc type, but is configured as a concave portion 248a that is straight in the cross-sectional tube axis direction. As in the case, the seal member is held by the straight holding portion 248a. The same effect as described above can also be achieved by holding the seal member with a linear arc surface in the axial direction while holding it. Moreover, it is good also as another arbitrary recessed part structure.

  The joint structure of the metal flexible hose of the present invention described above and the joint fitting used therefor are not limited only to the above-described embodiments, but can be arbitrarily selected without departing from the essence of the invention described in the claims. May be modified.

  The joint structure of the metal flexible hose of the present invention and the joint fitting used therefor can be widely applied as a joint structure of a pipe joint portion for piping of gas, other gases, liquids, etc. using the metal flexible hose, or a joint fitting thereof. obtain.

It is a partial cross section explanatory drawing of the joint structure of the metal flexible hose which concerns on 1st Embodiment of this invention. FIG. 2 is an enlarged partial cross-sectional explanatory diagram of a main part of FIG. 1. It is action explanatory drawing of the joint structure of the metal flexible hose of FIG. It is operation | movement explanatory drawing of the joint structure of the metal flexible hose of FIG. It is principal part expanded sectional explanatory drawing which shows the other structure of a pressure release channel | path. FIG. 6 is a partially enlarged explanatory view of the pressure relief passage of FIG. 5 as viewed in a direction of looking down at Ulsan. It is explanatory drawing which shows the other structure of the recessed part of the press-contact pipe part of the joint structure of FIG. It is a partial cross section explanatory drawing of the joint structure of the metal flexible hose which concerns on the 2nd Embodiment of this invention. It is action | operation explanatory drawing of the joint structure of the metal flexible hose of FIG. It is a figure which shows the example which made the joint metal fitting of another type in the joint structure of the metal flexible hose of FIG. It is operation | movement explanatory drawing of the joint structure of the metal flexible hose of FIG. It is a partial cross section explanatory drawing of the joint structure of the metal flexible hose which shows the example which made the recessed part of the press-contact pipe part in 2nd Embodiment into another structure. It is action explanatory drawing of the joint structure of the metal flexible hose of FIG.

2 peak part 2A peak part 2B at the end part 2nd peak part 3 valley part 3A end part Sugaya 10a, 10b, 10c, 10d metal flexible hose joint structure 12 metal flexible hose 14 metal flexible pipe
16 Joint fitting 18 Seal member 20 Pressure contact tube portion 24 Clamping portion 26 Thin portion 28 Pressure release hole 29 Pressure release groove 30 Blade 32 Fixing ring 181 O-ring 241 Concavity 242 Convex portion P channel

Claims (7)

It is a joint structure of a metal flexible hose by connecting a metal flexible pipe and a joint bracket.
Metal flexible tube,
A periphery of the metal flexible tube, and a seal member made of one or more O-ring disposed so disposed on the outer periphery of the connecting end portion closer to the joint fitting stops at folds valley metal flexible tube,
A pressure pipe section that crimped is fitted into a metal flexible tube so as to cover the integral connection has been sealed member to the joint fitting,
A joint structure for a metal flexible hose , comprising: a circumferential recess formed on an inner diameter side of the press contact tube portion so that the seal member is not excessively deformed when the press contact tube portion is crimped . The joint structure of a metal flexible hose according to claim 1, wherein the press-connecting pipe portion includes a circumferential convex portion that fits into a trough portion between adjacent ridges of the metal flexible pipe when caulking from the outside. . The connecting portion of the press-connecting pipe part and the fitting is formed by a thin part that is plastically deformed to the inner diameter side when caulking from the outside with respect to the press-connecting pipe part that is caulked from above the seal member. The joint structure of the metal flexible hose according to 1 or 2. The metal flexible hose according to any one of claims 1 to 3, wherein a blade and a ring for crimping the blade are externally mounted on the outer side of the pressure welding tube portion, and the blade and the pressure welding tube portion are crimped and fixed together. Joint structure. It is a joint structure of a metal flexible hose by connecting a metal flexible pipe and a joint bracket.
Metal flexible tube,
A seal member made of one or a plurality of O-rings disposed on the outer periphery of the metal flexible tube, and disposed on the outer periphery near the connection end with the joint fitting, and disposed so as to stop between the troughs of the metal flexible tube;
A press-connecting pipe portion that is integrally connected to the fitting and is fitted on the metal flexible pipe so as to cover the sealing member, and is crimped.
The O-ring in metal flexible tube Hidatani portion stopping the joint structure of a metal flexible hose, characterized in that a pressure relief hole communicating with the flow path side of the metal flexible tube. It is a joint structure of a metal flexible hose by connecting a metal flexible pipe and a joint bracket.
Metal flexible tube,
A seal member made of one or a plurality of O-rings disposed on the outer periphery of the metal flexible tube, and disposed on the outer periphery near the connection end with the joint fitting, and disposed so as to stop between the troughs of the metal flexible tube;
A press-connecting pipe portion that is integrally connected to the fitting and is fitted on the metal flexible pipe so as to cover the sealing member, and is crimped.
The O-ring in metal flexible tube Hidatani portion stopping the joint structure of a metal flexible hose, characterized in that a pressure relief groove communicating with the flow path side of the metal flexible tube. It claims 1 to joint fitting for use in joint structure of any metal flexible hose 6.

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